[alsa-devel] [PATCH v6 0/8] Fix year 2038 issue for sound subsystem
This is a series I worked on with Baolin in 2017 and 2018, but we never quite managed to finish up the last pieces. During the ALSA developer meetup at ELC-E 2018 in Edinburgh, a decision was made to go with this approach for keeping best compatibility with existing source code, and then I failed to follow up by resending the patches.
Now I have patches for all remaining time_t uses in the kernel, so it's absolutely time to revisit them. I have done more review of the patches myself and found a couple of minor issues that I have fixed up, otherwise the series is still the same as before.
Conceptually, the idea of these patches is:
- 64-bit applications should see no changes at all, neither compile-time nor run-time.
- 32-bit code compiled with a 64-bit time_t currently does not work with ALSA, and requires kernel changes and/or sound/asound.h changes
- Most 32-bit code using these interfaces will work correctly on a modified kernel, with or without the uapi header changes.
- 32-bit code using SNDRV_TIMER_IOCTL_TREAD requires the updated header file for 64-bit time_t support
- 32-bit i386 user space with 64-bit time_t is broken for SNDRV_PCM_IOCTL_STATUS, SNDRV_RAWMIDI_IOCTL_STATUS and SNDRV_PCM_IOCTL_SYNC_PTR because of i386 alignment. This is also addressed by the updated uapi header.
- PCM mmap is currently supported on native x86 kernels (both 32-bit and 64-bit) but not for compat mode. This series breaks the 32-bit native mmap support for 32-bit time_t, but instead allows it for 64-bit time_t on both native and compat kernels. This seems to be the best trade-off, as mmap support is optional already, and most 32-bit code runs in compat mode anyway.
- I've tried to avoid breaking compilation of 32-bit code as much as possible. Anything that does break however is likely code that is already broken on 64-bit time_t and needs source changes to fix them.
I would like to propose merging this into the alsa tree after the v5.5 merge window for inclusion into v5.6, to allow a good amount of testing, in particular for the header changes that may cause problems for user space applications.
A git branch with the same contents is available for testing at [1].
Please review and test!
Arnd
[1] https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git y2038-alsa [2] https://lore.kernel.org/lkml/CAK8P3a2Os66+iwQYf97qh05W2JP8rmWao8zmKoHiXqVHvy...
Changes since v5 (Arnd): - Rebased to linux-5.4-rc4 - Updated to completely remove timespec and time_t references from alsa - found and fixed a few bugs
Changes since v4 (Baolin): - Add patch 5 to change trigger_tstamp member of struct snd_pcm_runtime. - Add patch 8 to change internal timespec. - Add more explanation in commit message. - Use ktime_get_real_ts64() in patch 6. - Split common code out into a separate function in patch 6. - Fix tu->tread bug in patch 6 and remove #if __BITS_PER_LONG == 64 macro.
Changes since v3: - Move struct snd_pcm_status32 to pcm.h file. - Modify comments and commit message. - Add new patch2 ~ patch6.
Changes since v2: - Renamed all structures to make clear. - Remove CONFIG_X86_X32 macro and introduced new compat_snd_pcm_status64_x86_32.
Changes since v1: - Add one macro for struct snd_pcm_status_32 which only active in 32bits kernel. - Convert pcm_compat.c to use struct snd_pcm_status_64. - Convert pcm_native.c to use struct snd_pcm_status_64.
---
Arnd Bergmann (2): ALSA: move snd_pcm_ioctl_sync_ptr_compat into pcm_native.c ALSA: add new 32-bit layout for snd_pcm_mmap_status/control
Baolin Wang (6): ALSA: Replace timespec with timespec64 ALSA: Avoid using timespec for struct snd_timer_status ALSA: Avoid using timespec for struct snd_ctl_elem_value ALSA: Avoid using timespec for struct snd_pcm_status ALSA: Avoid using timespec for struct snd_rawmidi_status ALSA: Avoid using timespec for struct snd_timer_tread
include/sound/pcm.h | 74 ++++++-- include/sound/timer.h | 4 +- include/uapi/sound/asound.h | 132 ++++++++++++-- sound/core/pcm.c | 12 +- sound/core/pcm_compat.c | 282 ++++++++---------------------- sound/core/pcm_lib.c | 38 ++-- sound/core/pcm_native.c | 226 +++++++++++++++++++++--- sound/core/rawmidi.c | 132 +++++++++++--- sound/core/rawmidi_compat.c | 87 +++------ sound/core/timer.c | 229 ++++++++++++++++++------ sound/core/timer_compat.c | 62 +------ sound/pci/hda/hda_controller.c | 10 +- sound/soc/intel/skylake/skl-pcm.c | 4 +- 13 files changed, 804 insertions(+), 488 deletions(-)
From: Baolin Wang baolin.wang@linaro.org
Since timespec is not year 2038 safe on 32bit system, and we need to convert all timespec variables to timespec64 type for sound subsystem.
This patch is used to do preparation for following patches, that will convert all structures defined in uapi/sound/asound.h to use 64-bit time_t.
Signed-off-by: Baolin Wang baolin.wang@linaro.org Signed-off-by: Arnd Bergmann arnd@arndb.de --- include/sound/pcm.h | 18 ++++++++-------- include/sound/timer.h | 4 ++-- sound/core/pcm_lib.c | 36 +++++++++++++++++++------------ sound/core/pcm_native.c | 12 +++++++---- sound/core/timer.c | 28 ++++++++++++------------ sound/pci/hda/hda_controller.c | 10 ++++----- sound/soc/intel/skylake/skl-pcm.c | 4 ++-- 7 files changed, 62 insertions(+), 50 deletions(-)
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index bbe6eb1ff5d2..2665b3dc15e8 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -61,7 +61,7 @@ struct snd_pcm_ops { int (*trigger)(struct snd_pcm_substream *substream, int cmd); snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream); int (*get_time_info)(struct snd_pcm_substream *substream, - struct timespec *system_ts, struct timespec *audio_ts, + struct timespec64 *system_ts, struct timespec64 *audio_ts, struct snd_pcm_audio_tstamp_config *audio_tstamp_config, struct snd_pcm_audio_tstamp_report *audio_tstamp_report); int (*fill_silence)(struct snd_pcm_substream *substream, int channel, @@ -342,7 +342,7 @@ static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy struct snd_pcm_runtime { /* -- Status -- */ struct snd_pcm_substream *trigger_master; - struct timespec trigger_tstamp; /* trigger timestamp */ + struct timespec64 trigger_tstamp; /* trigger timestamp */ bool trigger_tstamp_latched; /* trigger timestamp latched in low-level driver/hardware */ int overrange; snd_pcm_uframes_t avail_max; @@ -418,7 +418,7 @@ struct snd_pcm_runtime { /* -- audio timestamp config -- */ struct snd_pcm_audio_tstamp_config audio_tstamp_config; struct snd_pcm_audio_tstamp_report audio_tstamp_report; - struct timespec driver_tstamp; + struct timespec64 driver_tstamp;
#if IS_ENABLED(CONFIG_SND_PCM_OSS) /* -- OSS things -- */ @@ -1151,22 +1151,22 @@ static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substrea }
/** - * snd_pcm_gettime - Fill the timespec depending on the timestamp mode + * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode * @runtime: PCM runtime instance - * @tv: timespec to fill + * @tv: timespec64 to fill */ static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, - struct timespec *tv) + struct timespec64 *tv) { switch (runtime->tstamp_type) { case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC: - ktime_get_ts(tv); + ktime_get_ts64(tv); break; case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW: - getrawmonotonic(tv); + ktime_get_raw_ts64(tv); break; default: - getnstimeofday(tv); + ktime_get_real_ts64(tv); break; } } diff --git a/include/sound/timer.h b/include/sound/timer.h index 199c36295a0d..357e30983284 100644 --- a/include/sound/timer.h +++ b/include/sound/timer.h @@ -89,7 +89,7 @@ struct snd_timer_instance { unsigned long ticks, unsigned long resolution); void (*ccallback) (struct snd_timer_instance * timeri, int event, - struct timespec * tstamp, + struct timespec64 * tstamp, unsigned long resolution); void (*disconnect)(struct snd_timer_instance *timeri); void *callback_data; @@ -113,7 +113,7 @@ struct snd_timer_instance { */
int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid, struct snd_timer **rtimer); -void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp); +void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tstamp); int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer); int snd_timer_global_free(struct snd_timer *timer); int snd_timer_global_register(struct snd_timer *timer); diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index d80041ea4e01..42cc1b71d1e3 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -144,8 +144,12 @@ void __snd_pcm_xrun(struct snd_pcm_substream *substream) struct snd_pcm_runtime *runtime = substream->runtime;
trace_xrun(substream); - if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) - snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); + if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { + struct timespec64 tstamp; + + snd_pcm_gettime(runtime, &tstamp); + runtime->status->tstamp = timespec64_to_timespec(tstamp); + } snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { char name[16]; @@ -200,12 +204,12 @@ int snd_pcm_update_state(struct snd_pcm_substream *substream, }
static void update_audio_tstamp(struct snd_pcm_substream *substream, - struct timespec *curr_tstamp, - struct timespec *audio_tstamp) + struct timespec64 *curr_tstamp, + struct timespec64 *audio_tstamp) { struct snd_pcm_runtime *runtime = substream->runtime; u64 audio_frames, audio_nsecs; - struct timespec driver_tstamp; + struct timespec64 driver_tstamp;
if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE) return; @@ -229,18 +233,22 @@ static void update_audio_tstamp(struct snd_pcm_substream *substream, } audio_nsecs = div_u64(audio_frames * 1000000000LL, runtime->rate); - *audio_tstamp = ns_to_timespec(audio_nsecs); + *audio_tstamp = ns_to_timespec64(audio_nsecs); } - if (!timespec_equal(&runtime->status->audio_tstamp, audio_tstamp)) { - runtime->status->audio_tstamp = *audio_tstamp; - runtime->status->tstamp = *curr_tstamp; + + if (runtime->status->audio_tstamp.tv_sec != audio_tstamp->tv_sec || + runtime->status->audio_tstamp.tv_nsec != audio_tstamp->tv_nsec) { + runtime->status->audio_tstamp = + timespec64_to_timespec(*audio_tstamp); + runtime->status->tstamp = timespec64_to_timespec(*curr_tstamp); }
+ /* * re-take a driver timestamp to let apps detect if the reference tstamp * read by low-level hardware was provided with a delay */ - snd_pcm_gettime(substream->runtime, (struct timespec *)&driver_tstamp); + snd_pcm_gettime(substream->runtime, &driver_tstamp); runtime->driver_tstamp = driver_tstamp; }
@@ -253,8 +261,8 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream, snd_pcm_sframes_t hdelta, delta; unsigned long jdelta; unsigned long curr_jiffies; - struct timespec curr_tstamp; - struct timespec audio_tstamp; + struct timespec64 curr_tstamp; + struct timespec64 audio_tstamp; int crossed_boundary = 0;
old_hw_ptr = runtime->status->hw_ptr; @@ -277,9 +285,9 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
/* re-test in case tstamp type is not supported in hardware and was demoted to DEFAULT */ if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT) - snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp); + snd_pcm_gettime(runtime, &curr_tstamp); } else - snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp); + snd_pcm_gettime(runtime, &curr_tstamp); }
if (pos == SNDRV_PCM_POS_XRUN) { diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index 91c6ad58729f..7d0fe30f1658 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -879,12 +879,12 @@ int snd_pcm_status(struct snd_pcm_substream *substream, status->suspended_state = runtime->status->suspended_state; if (status->state == SNDRV_PCM_STATE_OPEN) goto _end; - status->trigger_tstamp = runtime->trigger_tstamp; + status->trigger_tstamp = timespec64_to_timespec(runtime->trigger_tstamp); if (snd_pcm_running(substream)) { snd_pcm_update_hw_ptr(substream); if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { status->tstamp = runtime->status->tstamp; - status->driver_tstamp = runtime->driver_tstamp; + status->driver_tstamp = timespec64_to_timespec(runtime->driver_tstamp); status->audio_tstamp = runtime->status->audio_tstamp; if (runtime->audio_tstamp_report.valid == 1) @@ -897,8 +897,12 @@ int snd_pcm_status(struct snd_pcm_substream *substream, } } else { /* get tstamp only in fallback mode and only if enabled */ - if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) - snd_pcm_gettime(runtime, &status->tstamp); + if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { + struct timespec64 tstamp; + + snd_pcm_gettime(runtime, &tstamp); + status->tstamp = timespec64_to_timespec(tstamp); + } } _tstamp_end: status->appl_ptr = runtime->control->appl_ptr; diff --git a/sound/core/timer.c b/sound/core/timer.c index 5c9fbf3f4340..29b99cfb5215 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -59,7 +59,7 @@ struct snd_timer_user { spinlock_t qlock; unsigned long last_resolution; unsigned int filter; - struct timespec tstamp; /* trigger tstamp */ + struct timespec64 tstamp; /* trigger tstamp */ wait_queue_head_t qchange_sleep; struct fasync_struct *fasync; struct mutex ioctl_lock; @@ -450,12 +450,12 @@ static void snd_timer_notify1(struct snd_timer_instance *ti, int event) struct snd_timer *timer = ti->timer; unsigned long resolution = 0; struct snd_timer_instance *ts; - struct timespec tstamp; + struct timespec64 tstamp;
if (timer_tstamp_monotonic) - ktime_get_ts(&tstamp); + ktime_get_ts64(&tstamp); else - getnstimeofday(&tstamp); + ktime_get_real_ts64(&tstamp); if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_START || event > SNDRV_TIMER_EVENT_PAUSE)) return; @@ -1022,7 +1022,7 @@ static int snd_timer_dev_disconnect(struct snd_device *device) return 0; }
-void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstamp) +void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tstamp) { unsigned long flags; unsigned long resolution = 0; @@ -1315,7 +1315,7 @@ static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu,
static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, int event, - struct timespec *tstamp, + struct timespec64 *tstamp, unsigned long resolution) { struct snd_timer_user *tu = timeri->callback_data; @@ -1329,7 +1329,7 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, return; memset(&r1, 0, sizeof(r1)); r1.event = event; - r1.tstamp = *tstamp; + r1.tstamp = timespec64_to_timespec(*tstamp); r1.val = resolution; spin_lock_irqsave(&tu->qlock, flags); snd_timer_user_append_to_tqueue(tu, &r1); @@ -1352,7 +1352,7 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, { struct snd_timer_user *tu = timeri->callback_data; struct snd_timer_tread *r, r1; - struct timespec tstamp; + struct timespec64 tstamp; int prev, append = 0;
memset(&r1, 0, sizeof(r1)); @@ -1365,14 +1365,14 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, } if (tu->last_resolution != resolution || ticks > 0) { if (timer_tstamp_monotonic) - ktime_get_ts(&tstamp); + ktime_get_ts64(&tstamp); else - getnstimeofday(&tstamp); + ktime_get_real_ts64(&tstamp); } if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) { r1.event = SNDRV_TIMER_EVENT_RESOLUTION; - r1.tstamp = tstamp; + r1.tstamp = timespec64_to_timespec(tstamp); r1.val = resolution; snd_timer_user_append_to_tqueue(tu, &r1); tu->last_resolution = resolution; @@ -1386,14 +1386,14 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; r = &tu->tqueue[prev]; if (r->event == SNDRV_TIMER_EVENT_TICK) { - r->tstamp = tstamp; + r->tstamp = timespec64_to_timespec(tstamp); r->val += ticks; append++; goto __wake; } } r1.event = SNDRV_TIMER_EVENT_TICK; - r1.tstamp = tstamp; + r1.tstamp = timespec64_to_timespec(tstamp); r1.val = ticks; snd_timer_user_append_to_tqueue(tu, &r1); append++; @@ -1871,7 +1871,7 @@ static int snd_timer_user_status(struct file *file, if (!tu->timeri) return -EBADFD; memset(&status, 0, sizeof(status)); - status.tstamp = tu->tstamp; + status.tstamp = timespec64_to_timespec(tu->tstamp); status.resolution = snd_timer_resolution(tu->timeri); status.lost = tu->timeri->lost; status.overrun = tu->overrun; diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c index 6387c7e90918..d4620b0561e9 100644 --- a/sound/pci/hda/hda_controller.c +++ b/sound/pci/hda/hda_controller.c @@ -491,7 +491,7 @@ static inline bool is_link_time_supported(struct snd_pcm_runtime *runtime, }
static int azx_get_time_info(struct snd_pcm_substream *substream, - struct timespec *system_ts, struct timespec *audio_ts, + struct timespec64 *system_ts, struct timespec64 *audio_ts, struct snd_pcm_audio_tstamp_config *audio_tstamp_config, struct snd_pcm_audio_tstamp_report *audio_tstamp_report) { @@ -511,7 +511,7 @@ static int azx_get_time_info(struct snd_pcm_substream *substream, if (audio_tstamp_config->report_delay) nsec = azx_adjust_codec_delay(substream, nsec);
- *audio_ts = ns_to_timespec(nsec); + *audio_ts = ns_to_timespec64(nsec);
audio_tstamp_report->actual_type = SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; audio_tstamp_report->accuracy_report = 1; /* rest of structure is valid */ @@ -528,16 +528,16 @@ static int azx_get_time_info(struct snd_pcm_substream *substream, return -EINVAL;
case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW: - *system_ts = ktime_to_timespec(xtstamp.sys_monoraw); + *system_ts = ktime_to_timespec64(xtstamp.sys_monoraw); break;
default: - *system_ts = ktime_to_timespec(xtstamp.sys_realtime); + *system_ts = ktime_to_timespec64(xtstamp.sys_realtime); break;
}
- *audio_ts = ktime_to_timespec(xtstamp.device); + *audio_ts = ktime_to_timespec64(xtstamp.device);
audio_tstamp_report->actual_type = SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK_SYNCHRONIZED; diff --git a/sound/soc/intel/skylake/skl-pcm.c b/sound/soc/intel/skylake/skl-pcm.c index 7f287424af9b..17b7bacf1e2c 100644 --- a/sound/soc/intel/skylake/skl-pcm.c +++ b/sound/soc/intel/skylake/skl-pcm.c @@ -1246,7 +1246,7 @@ static u64 skl_adjust_codec_delay(struct snd_pcm_substream *substream, }
static int skl_get_time_info(struct snd_pcm_substream *substream, - struct timespec *system_ts, struct timespec *audio_ts, + struct timespec64 *system_ts, struct timespec64 *audio_ts, struct snd_pcm_audio_tstamp_config *audio_tstamp_config, struct snd_pcm_audio_tstamp_report *audio_tstamp_report) { @@ -1264,7 +1264,7 @@ static int skl_get_time_info(struct snd_pcm_substream *substream, if (audio_tstamp_config->report_delay) nsec = skl_adjust_codec_delay(substream, nsec);
- *audio_ts = ns_to_timespec(nsec); + *audio_ts = ns_to_timespec64(nsec);
audio_tstamp_report->actual_type = SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; audio_tstamp_report->accuracy_report = 1; /* rest of struct is valid */
From: Baolin Wang baolin.wang@linaro.org
struct snd_timer_status uses 'timespec' type variables to record timestamp, which will be changed to an incompatible layout with updated user space using 64-bit time_t.
To handle both the old and the new layout on 32-bit architectures, this patch introduces 'struct snd_timer_status32' and 'struct snd_timer_status64' to handle 32bit time_t and 64bit time_t in native mode and compat mode, which replaces timespec with s64 type.
When glibc changes time_t to 64-bit, any recompiled program will issue ioctl commands that the kernel does not understand without this patch.
Signed-off-by: Baolin Wang baolin.wang@linaro.org Signed-off-by: Arnd Bergmann arnd@arndb.de --- include/uapi/sound/asound.h | 2 ++ sound/core/timer.c | 62 +++++++++++++++++++++++++++++++++---- sound/core/timer_compat.c | 57 ++++------------------------------ 3 files changed, 64 insertions(+), 57 deletions(-)
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index df1153cea0b7..930854f67fd3 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -761,6 +761,7 @@ struct snd_timer_params { unsigned char reserved[60]; /* reserved */ };
+#ifndef __KERNEL__ struct snd_timer_status { struct timespec tstamp; /* Timestamp - last update */ unsigned int resolution; /* current period resolution in ns */ @@ -769,6 +770,7 @@ struct snd_timer_status { unsigned int queue; /* used queue size */ unsigned char reserved[64]; /* reserved */ }; +#endif
#define SNDRV_TIMER_IOCTL_PVERSION _IOR('T', 0x00, int) #define SNDRV_TIMER_IOCTL_NEXT_DEVICE _IOWR('T', 0x01, struct snd_timer_id) diff --git a/sound/core/timer.c b/sound/core/timer.c index 29b99cfb5215..921f4ae2f9bf 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -65,6 +65,30 @@ struct snd_timer_user { struct mutex ioctl_lock; };
+struct snd_timer_status32 { + s32 tstamp_sec; /* Timestamp - last update */ + s32 tstamp_nsec; + unsigned int resolution; /* current period resolution in ns */ + unsigned int lost; /* counter of master tick lost */ + unsigned int overrun; /* count of read queue overruns */ + unsigned int queue; /* used queue size */ + unsigned char reserved[64]; /* reserved */ +}; + +#define SNDRV_TIMER_IOCTL_STATUS32 _IOR('T', 0x14, struct snd_timer_status32) + +struct snd_timer_status64 { + s64 tstamp_sec; /* Timestamp - last update */ + s64 tstamp_nsec; + unsigned int resolution; /* current period resolution in ns */ + unsigned int lost; /* counter of master tick lost */ + unsigned int overrun; /* count of read queue overruns */ + unsigned int queue; /* used queue size */ + unsigned char reserved[64]; /* reserved */ +}; + +#define SNDRV_TIMER_IOCTL_STATUS64 _IOR('T', 0x14, struct snd_timer_status64) + /* list of timers */ static LIST_HEAD(snd_timer_list);
@@ -1861,17 +1885,41 @@ static int snd_timer_user_params(struct file *file, return err; }
-static int snd_timer_user_status(struct file *file, - struct snd_timer_status __user *_status) +static int snd_timer_user_status32(struct file *file, + struct snd_timer_status32 __user *_status) + { + struct snd_timer_user *tu; + struct snd_timer_status32 status; + + tu = file->private_data; + if (!tu->timeri) + return -EBADFD; + memset(&status, 0, sizeof(status)); + status.tstamp_sec = tu->tstamp.tv_sec; + status.tstamp_nsec = tu->tstamp.tv_nsec; + status.resolution = snd_timer_resolution(tu->timeri); + status.lost = tu->timeri->lost; + status.overrun = tu->overrun; + spin_lock_irq(&tu->qlock); + status.queue = tu->qused; + spin_unlock_irq(&tu->qlock); + if (copy_to_user(_status, &status, sizeof(status))) + return -EFAULT; + return 0; +} + +static int snd_timer_user_status64(struct file *file, + struct snd_timer_status64 __user *_status) { struct snd_timer_user *tu; - struct snd_timer_status status; + struct snd_timer_status64 status;
tu = file->private_data; if (!tu->timeri) return -EBADFD; memset(&status, 0, sizeof(status)); - status.tstamp = timespec64_to_timespec(tu->tstamp); + status.tstamp_sec = tu->tstamp.tv_sec; + status.tstamp_nsec = tu->tstamp.tv_nsec; status.resolution = snd_timer_resolution(tu->timeri); status.lost = tu->timeri->lost; status.overrun = tu->overrun; @@ -1995,8 +2043,10 @@ static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, return snd_timer_user_info(file, argp); case SNDRV_TIMER_IOCTL_PARAMS: return snd_timer_user_params(file, argp); - case SNDRV_TIMER_IOCTL_STATUS: - return snd_timer_user_status(file, argp); + case SNDRV_TIMER_IOCTL_STATUS32: + return snd_timer_user_status32(file, argp); + case SNDRV_TIMER_IOCTL_STATUS64: + return snd_timer_user_status64(file, argp); case SNDRV_TIMER_IOCTL_START: case SNDRV_TIMER_IOCTL_START_OLD: return snd_timer_user_start(file); diff --git a/sound/core/timer_compat.c b/sound/core/timer_compat.c index bb6be484dfd3..20eef5bc304b 100644 --- a/sound/core/timer_compat.c +++ b/sound/core/timer_compat.c @@ -69,54 +69,11 @@ static int snd_timer_user_info_compat(struct file *file, return 0; }
-struct snd_timer_status32 { - struct compat_timespec tstamp; - u32 resolution; - u32 lost; - u32 overrun; - u32 queue; - unsigned char reserved[64]; -}; - -static int snd_timer_user_status_compat(struct file *file, - struct snd_timer_status32 __user *_status) -{ - struct snd_timer_user *tu; - struct snd_timer_status32 status; - - tu = file->private_data; - if (!tu->timeri) - return -EBADFD; - memset(&status, 0, sizeof(status)); - status.tstamp.tv_sec = tu->tstamp.tv_sec; - status.tstamp.tv_nsec = tu->tstamp.tv_nsec; - status.resolution = snd_timer_resolution(tu->timeri); - status.lost = tu->timeri->lost; - status.overrun = tu->overrun; - spin_lock_irq(&tu->qlock); - status.queue = tu->qused; - spin_unlock_irq(&tu->qlock); - if (copy_to_user(_status, &status, sizeof(status))) - return -EFAULT; - return 0; -} - -#ifdef CONFIG_X86_X32 -/* X32 ABI has the same struct as x86-64 */ -#define snd_timer_user_status_x32(file, s) \ - snd_timer_user_status(file, s) -#endif /* CONFIG_X86_X32 */ - -/* - */ - enum { SNDRV_TIMER_IOCTL_GPARAMS32 = _IOW('T', 0x04, struct snd_timer_gparams32), SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32), - SNDRV_TIMER_IOCTL_STATUS32 = _IOW('T', 0x14, struct snd_timer_status32), -#ifdef CONFIG_X86_X32 - SNDRV_TIMER_IOCTL_STATUS_X32 = _IOW('T', 0x14, struct snd_timer_status), -#endif /* CONFIG_X86_X32 */ + SNDRV_TIMER_IOCTL_STATUS_COMPAT32 = _IOW('T', 0x14, struct snd_timer_status32), + SNDRV_TIMER_IOCTL_STATUS_COMPAT64 = _IOW('T', 0x14, struct snd_timer_status64), };
static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd, @@ -145,12 +102,10 @@ static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd, return snd_timer_user_gparams_compat(file, argp); case SNDRV_TIMER_IOCTL_INFO32: return snd_timer_user_info_compat(file, argp); - case SNDRV_TIMER_IOCTL_STATUS32: - return snd_timer_user_status_compat(file, argp); -#ifdef CONFIG_X86_X32 - case SNDRV_TIMER_IOCTL_STATUS_X32: - return snd_timer_user_status_x32(file, argp); -#endif /* CONFIG_X86_X32 */ + case SNDRV_TIMER_IOCTL_STATUS_COMPAT32: + return snd_timer_user_status32(file, argp); + case SNDRV_TIMER_IOCTL_STATUS_COMPAT64: + return snd_timer_user_status64(file, argp); } return -ENOIOCTLCMD; }
On Tue, 12 Nov 2019 16:16:36 +0100, Arnd Bergmann wrote:
From: Baolin Wang baolin.wang@linaro.org
struct snd_timer_status uses 'timespec' type variables to record timestamp, which will be changed to an incompatible layout with updated user space using 64-bit time_t.
To handle both the old and the new layout on 32-bit architectures, this patch introduces 'struct snd_timer_status32' and 'struct snd_timer_status64' to handle 32bit time_t and 64bit time_t in native mode and compat mode, which replaces timespec with s64 type.
When glibc changes time_t to 64-bit, any recompiled program will issue ioctl commands that the kernel does not understand without this patch.
Signed-off-by: Baolin Wang baolin.wang@linaro.org Signed-off-by: Arnd Bergmann arnd@arndb.de
include/uapi/sound/asound.h | 2 ++ sound/core/timer.c | 62 +++++++++++++++++++++++++++++++++---- sound/core/timer_compat.c | 57 ++++------------------------------ 3 files changed, 64 insertions(+), 57 deletions(-)
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index df1153cea0b7..930854f67fd3 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -761,6 +761,7 @@ struct snd_timer_params { unsigned char reserved[60]; /* reserved */ };
+#ifndef __KERNEL__ struct snd_timer_status { struct timespec tstamp; /* Timestamp - last update */ unsigned int resolution; /* current period resolution in ns */
Do we need this ifndef? Is it for stopping the reference of struct snd_timer_status from the kernel code but only 32 and 64 variants?
thanks,
Takashi
On Tue, Nov 12, 2019 at 4:42 PM Takashi Iwai tiwai@suse.de wrote:
@@ -761,6 +761,7 @@ struct snd_timer_params { unsigned char reserved[60]; /* reserved */ };
+#ifndef __KERNEL__ struct snd_timer_status { struct timespec tstamp; /* Timestamp - last update */ unsigned int resolution; /* current period resolution in ns */
Do we need this ifndef? Is it for stopping the reference of struct snd_timer_status from the kernel code but only 32 and 64 variants?
Well spotted, this is indeed a very recent change I did to the patch. The idea here is to hide any use of 'time_t', 'timespec' and 'timeval' from kernel compilation. These types are now defined in an incompatible way by libc, so we have to remove them from the kernel's uapi headers. I would prefer to remove them completely from the kernel (rather than moving them from uapi to internal headers) to make it harder to write y2038-incompatible code, and with the 90 patches I sent this week, all users are gone from the kernel (this series was the last part).
Interestingly, hiding snd_timer_status from the drivers /also/ caught a but in a file when I had missed a reference that needed to be converted to snd_timer_status64.
Arnd
On Tue, 12 Nov 2019 21:08:17 +0100, Arnd Bergmann wrote:
On Tue, Nov 12, 2019 at 4:42 PM Takashi Iwai tiwai@suse.de wrote:
@@ -761,6 +761,7 @@ struct snd_timer_params { unsigned char reserved[60]; /* reserved */ };
+#ifndef __KERNEL__ struct snd_timer_status { struct timespec tstamp; /* Timestamp - last update */ unsigned int resolution; /* current period resolution in ns */
Do we need this ifndef? Is it for stopping the reference of struct snd_timer_status from the kernel code but only 32 and 64 variants?
Well spotted, this is indeed a very recent change I did to the patch. The idea here is to hide any use of 'time_t', 'timespec' and 'timeval' from kernel compilation. These types are now defined in an incompatible way by libc, so we have to remove them from the kernel's uapi headers. I would prefer to remove them completely from the kernel (rather than moving them from uapi to internal headers) to make it harder to write y2038-incompatible code, and with the 90 patches I sent this week, all users are gone from the kernel (this series was the last part).
Could you put this trick in the changelog, too?
Interestingly, hiding snd_timer_status from the drivers /also/ caught a but in a file when I had missed a reference that needed to be converted to snd_timer_status64.
Heh, that's no surprising, proving the usefulness :)
thanks,
Takashi
On Tue, Nov 12, 2019 at 9:28 PM Takashi Iwai tiwai@suse.de wrote:
Well spotted, this is indeed a very recent change I did to the patch. The idea here is to hide any use of 'time_t', 'timespec' and 'timeval' from kernel compilation. These types are now defined in an incompatible way by libc, so we have to remove them from the kernel's uapi headers. I would prefer to remove them completely from the kernel (rather than moving them from uapi to internal headers) to make it harder to write y2038-incompatible code, and with the 90 patches I sent this week, all users are gone from the kernel (this series was the last part).
Could you put this trick in the changelog, too?
Done.
Arnd
From: Baolin Wang baolin.wang@linaro.org
The struct snd_ctl_elem_value will use 'timespec' type variables to record timestamp, which is not year 2038 safe on 32bits system.
Since there are no drivers will implemented the tstamp member of the struct snd_ctl_elem_value, and also the stucture size will not be changed if we change timespec to s64 for tstamp member of struct snd_ctl_elem_value.
From Takashi's comments, "In the library, applications are not expected
to access to this structure directly. The applications get opaque pointer to the structure and must use any control APIs to operate it. Actually the library produce no API to handle 'struct snd_ctl_elem_value.tstamp'. This means that we can drop this member from alsa-lib without decline of functionality." Thus we can simply remove the tstamp member to avoid using the type which is not year 2038 safe on 32bits system.
Signed-off-by: Baolin Wang baolin.wang@linaro.org Signed-off-by: Arnd Bergmann arnd@arndb.de --- include/uapi/sound/asound.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 930854f67fd3..40a23d8418fe 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -957,8 +957,7 @@ struct snd_ctl_elem_value { } bytes; struct snd_aes_iec958 iec958; } value; /* RO */ - struct timespec tstamp; - unsigned char reserved[128-sizeof(struct timespec)]; + unsigned char reserved[128]; };
struct snd_ctl_tlv {
From: Baolin Wang baolin.wang@linaro.org
The struct snd_pcm_status will use 'timespec' type variables to record timestamp, which is not year 2038 safe on 32bits system.
Userspace will use SNDRV_PCM_IOCTL_STATUS and SNDRV_PCM_IOCTL_STATUS_EXT as commands to issue ioctl() to fill the 'snd_pcm_status' structure in userspace. The command number is always defined through _IOR/_IOW/IORW, so when userspace changes the definition of 'struct timespec' to use 64-bit types, the command number also changes.
Thus in the kernel, we now need to define two versions of each such ioctl and corresponding ioctl commands to handle 32bit time_t and 64bit time_t in native mode: struct snd_pcm_status32 { ......
s32 trigger_tstamp_sec; s32 trigger_tstamp_nsec;
......
s32 audio_tstamp_sec; s32 audio_tstamp_nsec;
...... };
struct snd_pcm_status64 { ......
s32 trigger_tstamp_sec; s32 trigger_tstamp_nsec;
......
s32 audio_tstamp_sec; s32 audio_tstamp_nsec;
...... };
Moreover in compat file, we renamed or introduced new structures to handle 32bit/64bit time_t in compatible mode. The 'struct snd_pcm_status32' and snd_pcm_status_user32() are used to handle 32bit time_t in compat mode. 'struct compat_snd_pcm_status64' and snd_pcm_status_user_compat64() are used to handle 64bit time_t.
Finally we can replace SNDRV_PCM_IOCTL_STATUS and SNDRV_PCM_IOCTL_STATUS_EXT with new commands and introduce new functions to fill new 'struct snd_pcm_status64' instead of using unsafe 'struct snd_pcm_status'. Then in future, the new commands can be matched when userspace changes 'timespec' to 64bit type to make a size change of 'struct snd_pcm_status'. When glibc changes time_t to 64-bit, any recompiled program will issue ioctl commands that the kernel does not understand without this patch.
Signed-off-by: Baolin Wang baolin.wang@linaro.org Signed-off-by: Arnd Bergmann arnd@arndb.de --- include/sound/pcm.h | 56 ++++++++++++- include/uapi/sound/asound.h | 3 + sound/core/pcm.c | 12 +-- sound/core/pcm_compat.c | 154 +++++++++++++----------------------- sound/core/pcm_native.c | 96 ++++++++++++++++++---- 5 files changed, 195 insertions(+), 126 deletions(-)
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index 2665b3dc15e8..3366128f42a2 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -44,6 +44,7 @@ struct snd_pcm_hardware { size_t fifo_size; /* fifo size in bytes */ };
+struct snd_pcm_status64; struct snd_pcm_substream;
struct snd_pcm_audio_tstamp_config; /* definitions further down */ @@ -554,8 +555,8 @@ int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); int snd_pcm_info_user(struct snd_pcm_substream *substream, struct snd_pcm_info __user *info); -int snd_pcm_status(struct snd_pcm_substream *substream, - struct snd_pcm_status *status); +int snd_pcm_status64(struct snd_pcm_substream *substream, + struct snd_pcm_status64 *status); int snd_pcm_start(struct snd_pcm_substream *substream); int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status); int snd_pcm_drain_done(struct snd_pcm_substream *substream); @@ -1422,4 +1423,55 @@ static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format) #define pcm_dbg(pcm, fmt, args...) \ dev_dbg((pcm)->card->dev, fmt, ##args)
+struct snd_pcm_status64 { + snd_pcm_state_t state; /* stream state */ + u8 rsvd[4]; + s64 trigger_tstamp_sec; /* time when stream was started/stopped/paused */ + s64 trigger_tstamp_nsec; + s64 tstamp_sec; /* reference timestamp */ + s64 tstamp_nsec; + snd_pcm_uframes_t appl_ptr; /* appl ptr */ + snd_pcm_uframes_t hw_ptr; /* hw ptr */ + snd_pcm_sframes_t delay; /* current delay in frames */ + snd_pcm_uframes_t avail; /* number of frames available */ + snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */ + snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */ + snd_pcm_state_t suspended_state; /* suspended stream state */ + __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ + s64 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */ + s64 audio_tstamp_nsec; + s64 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */ + s64 driver_tstamp_nsec; + __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ + unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */ +}; + +#define SNDRV_PCM_IOCTL_STATUS64 _IOR('A', 0x20, struct snd_pcm_status64) +#define SNDRV_PCM_IOCTL_STATUS_EXT64 _IOWR('A', 0x24, struct snd_pcm_status64) + +struct snd_pcm_status32 { + s32 state; /* stream state */ + s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */ + s32 trigger_tstamp_nsec; + s32 tstamp_sec; /* reference timestamp */ + s32 tstamp_nsec; + u32 appl_ptr; /* appl ptr */ + u32 hw_ptr; /* hw ptr */ + s32 delay; /* current delay in frames */ + u32 avail; /* number of frames available */ + u32 avail_max; /* max frames available on hw since last status */ + u32 overrange; /* count of ADC (capture) overrange detections from last status */ + s32 suspended_state; /* suspended stream state */ + u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ + s32 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */ + s32 audio_tstamp_nsec; + s32 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */ + s32 driver_tstamp_nsec; + u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ + unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */ +}; + +#define SNDRV_PCM_IOCTL_STATUS32 _IOR('A', 0x20, struct snd_pcm_status32) +#define SNDRV_PCM_IOCTL_STATUS_EXT32 _IOWR('A', 0x24, struct snd_pcm_status32) + #endif /* __SOUND_PCM_H */ diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 40a23d8418fe..7b74524f9406 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -456,8 +456,10 @@ enum { SNDRV_PCM_AUDIO_TSTAMP_TYPE_LAST = SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK_SYNCHRONIZED };
+#ifndef __KERNEL__ struct snd_pcm_status { snd_pcm_state_t state; /* stream state */ + unsigned char pad1[sizeof(time_t) - sizeof(snd_pcm_state_t)]; /* align to timespec */ struct timespec trigger_tstamp; /* time when stream was started/stopped/paused */ struct timespec tstamp; /* reference timestamp */ snd_pcm_uframes_t appl_ptr; /* appl ptr */ @@ -473,6 +475,7 @@ struct snd_pcm_status { __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ unsigned char reserved[52-2*sizeof(struct timespec)]; /* must be filled with zero */ }; +#endif
struct snd_pcm_mmap_status { snd_pcm_state_t state; /* RO: state - SNDRV_PCM_STATE_XXXX */ diff --git a/sound/core/pcm.c b/sound/core/pcm.c index 9a72d641743d..85db55ea49fd 100644 --- a/sound/core/pcm.c +++ b/sound/core/pcm.c @@ -443,7 +443,7 @@ static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, { struct snd_pcm_substream *substream = entry->private_data; struct snd_pcm_runtime *runtime; - struct snd_pcm_status status; + struct snd_pcm_status64 status; int err;
mutex_lock(&substream->pcm->open_mutex); @@ -453,17 +453,17 @@ static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry, goto unlock; } memset(&status, 0, sizeof(status)); - err = snd_pcm_status(substream, &status); + err = snd_pcm_status64(substream, &status); if (err < 0) { snd_iprintf(buffer, "error %d\n", err); goto unlock; } snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state)); snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid)); - snd_iprintf(buffer, "trigger_time: %ld.%09ld\n", - status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec); - snd_iprintf(buffer, "tstamp : %ld.%09ld\n", - status.tstamp.tv_sec, status.tstamp.tv_nsec); + snd_iprintf(buffer, "trigger_time: %lld.%09lld\n", + status.trigger_tstamp_sec, status.trigger_tstamp_nsec); + snd_iprintf(buffer, "tstamp : %lld.%09lld\n", + status.tstamp_sec, status.tstamp_nsec); snd_iprintf(buffer, "delay : %ld\n", status.delay); snd_iprintf(buffer, "avail : %ld\n", status.avail); snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max); diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c index 6f9003b1869a..2671658442ea 100644 --- a/sound/core/pcm_compat.c +++ b/sound/core/pcm_compat.c @@ -168,73 +168,13 @@ static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, snd_pcm_channel_info_user(s, p) #endif /* CONFIG_X86_X32 */
-struct snd_pcm_status32 { +struct compat_snd_pcm_status64 { s32 state; - struct compat_timespec trigger_tstamp; - struct compat_timespec tstamp; - u32 appl_ptr; - u32 hw_ptr; - s32 delay; - u32 avail; - u32 avail_max; - u32 overrange; - s32 suspended_state; - u32 audio_tstamp_data; - struct compat_timespec audio_tstamp; - struct compat_timespec driver_tstamp; - u32 audio_tstamp_accuracy; - unsigned char reserved[52-2*sizeof(struct compat_timespec)]; -} __attribute__((packed)); - - -static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream, - struct snd_pcm_status32 __user *src, - bool ext) -{ - struct snd_pcm_status status; - int err; - - memset(&status, 0, sizeof(status)); - /* - * with extension, parameters are read/write, - * get audio_tstamp_data from user, - * ignore rest of status structure - */ - if (ext && get_user(status.audio_tstamp_data, - (u32 __user *)(&src->audio_tstamp_data))) - return -EFAULT; - err = snd_pcm_status(substream, &status); - if (err < 0) - return err; - - if (clear_user(src, sizeof(*src))) - return -EFAULT; - if (put_user(status.state, &src->state) || - compat_put_timespec(&status.trigger_tstamp, &src->trigger_tstamp) || - compat_put_timespec(&status.tstamp, &src->tstamp) || - put_user(status.appl_ptr, &src->appl_ptr) || - put_user(status.hw_ptr, &src->hw_ptr) || - put_user(status.delay, &src->delay) || - put_user(status.avail, &src->avail) || - put_user(status.avail_max, &src->avail_max) || - put_user(status.overrange, &src->overrange) || - put_user(status.suspended_state, &src->suspended_state) || - put_user(status.audio_tstamp_data, &src->audio_tstamp_data) || - compat_put_timespec(&status.audio_tstamp, &src->audio_tstamp) || - compat_put_timespec(&status.driver_tstamp, &src->driver_tstamp) || - put_user(status.audio_tstamp_accuracy, &src->audio_tstamp_accuracy)) - return -EFAULT; - - return err; -} - -#ifdef CONFIG_X86_X32 -/* X32 ABI has 64bit timespec and 64bit alignment */ -struct snd_pcm_status_x32 { - s32 state; - u32 rsvd; /* alignment */ - struct timespec trigger_tstamp; - struct timespec tstamp; + u8 rsvd[4]; /* alignment */ + s64 trigger_tstamp_sec; + s64 trigger_tstamp_nsec; + s64 tstamp_sec; + s64 tstamp_nsec; u32 appl_ptr; u32 hw_ptr; s32 delay; @@ -243,22 +183,26 @@ struct snd_pcm_status_x32 { u32 overrange; s32 suspended_state; u32 audio_tstamp_data; - struct timespec audio_tstamp; - struct timespec driver_tstamp; + s64 audio_tstamp_sec; + s64 audio_tstamp_nsec; + s64 driver_tstamp_sec; + s64 driver_tstamp_nsec; u32 audio_tstamp_accuracy; - unsigned char reserved[52-2*sizeof(struct timespec)]; + unsigned char reserved[52-4*sizeof(s64)]; } __packed;
#define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst))
-static int snd_pcm_status_user_x32(struct snd_pcm_substream *substream, - struct snd_pcm_status_x32 __user *src, - bool ext) +static int snd_pcm_status_user_compat64(struct snd_pcm_substream *substream, + struct compat_snd_pcm_status64 __user *src, + bool ext) { - struct snd_pcm_status status; + struct snd_pcm_status64 status; + struct compat_snd_pcm_status64 compat_status64; int err;
memset(&status, 0, sizeof(status)); + memset(&compat_status64, 0, sizeof(compat_status64)); /* * with extension, parameters are read/write, * get audio_tstamp_data from user, @@ -267,31 +211,39 @@ static int snd_pcm_status_user_x32(struct snd_pcm_substream *substream, if (ext && get_user(status.audio_tstamp_data, (u32 __user *)(&src->audio_tstamp_data))) return -EFAULT; - err = snd_pcm_status(substream, &status); + err = snd_pcm_status64(substream, &status); if (err < 0) return err;
if (clear_user(src, sizeof(*src))) return -EFAULT; - if (put_user(status.state, &src->state) || - put_timespec(&status.trigger_tstamp, &src->trigger_tstamp) || - put_timespec(&status.tstamp, &src->tstamp) || - put_user(status.appl_ptr, &src->appl_ptr) || - put_user(status.hw_ptr, &src->hw_ptr) || - put_user(status.delay, &src->delay) || - put_user(status.avail, &src->avail) || - put_user(status.avail_max, &src->avail_max) || - put_user(status.overrange, &src->overrange) || - put_user(status.suspended_state, &src->suspended_state) || - put_user(status.audio_tstamp_data, &src->audio_tstamp_data) || - put_timespec(&status.audio_tstamp, &src->audio_tstamp) || - put_timespec(&status.driver_tstamp, &src->driver_tstamp) || - put_user(status.audio_tstamp_accuracy, &src->audio_tstamp_accuracy)) + + compat_status64 = (struct compat_snd_pcm_status64) { + .state = status.state, + .trigger_tstamp_sec = status.trigger_tstamp_sec, + .trigger_tstamp_nsec = status.trigger_tstamp_nsec, + .tstamp_sec = status.tstamp_sec, + .tstamp_nsec = status.tstamp_nsec, + .appl_ptr = status.appl_ptr, + .hw_ptr = status.hw_ptr, + .delay = status.delay, + .avail = status.avail, + .avail_max = status.avail_max, + .overrange = status.overrange, + .suspended_state = status.suspended_state, + .audio_tstamp_data = status.audio_tstamp_data, + .audio_tstamp_sec = status.audio_tstamp_sec, + .audio_tstamp_nsec = status.audio_tstamp_nsec, + .driver_tstamp_sec = status.audio_tstamp_sec, + .driver_tstamp_nsec = status.audio_tstamp_nsec, + .audio_tstamp_accuracy = status.audio_tstamp_accuracy, + }; + + if (copy_to_user(src, &compat_status64, sizeof(compat_status64))) return -EFAULT;
return err; } -#endif /* CONFIG_X86_X32 */
/* both for HW_PARAMS and HW_REFINE */ static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream, @@ -616,8 +568,8 @@ enum { SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct snd_pcm_hw_params32), SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32), SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32), - SNDRV_PCM_IOCTL_STATUS32 = _IOR('A', 0x20, struct snd_pcm_status32), - SNDRV_PCM_IOCTL_STATUS_EXT32 = _IOWR('A', 0x24, struct snd_pcm_status32), + SNDRV_PCM_IOCTL_STATUS_COMPAT32 = _IOR('A', 0x20, struct snd_pcm_status32), + SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT32 = _IOWR('A', 0x24, struct snd_pcm_status32), SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32), SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32), SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32), @@ -627,10 +579,10 @@ enum { SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32), SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32), SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32), + SNDRV_PCM_IOCTL_STATUS_COMPAT64 = _IOR('A', 0x20, struct compat_snd_pcm_status64), + SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64 = _IOWR('A', 0x24, struct compat_snd_pcm_status64), #ifdef CONFIG_X86_X32 SNDRV_PCM_IOCTL_CHANNEL_INFO_X32 = _IOR('A', 0x32, struct snd_pcm_channel_info), - SNDRV_PCM_IOCTL_STATUS_X32 = _IOR('A', 0x20, struct snd_pcm_status_x32), - SNDRV_PCM_IOCTL_STATUS_EXT_X32 = _IOWR('A', 0x24, struct snd_pcm_status_x32), SNDRV_PCM_IOCTL_SYNC_PTR_X32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr_x32), #endif /* CONFIG_X86_X32 */ }; @@ -680,10 +632,10 @@ static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned l return snd_pcm_ioctl_hw_params_compat(substream, 0, argp); case SNDRV_PCM_IOCTL_SW_PARAMS32: return snd_pcm_ioctl_sw_params_compat(substream, argp); - case SNDRV_PCM_IOCTL_STATUS32: - return snd_pcm_status_user_compat(substream, argp, false); - case SNDRV_PCM_IOCTL_STATUS_EXT32: - return snd_pcm_status_user_compat(substream, argp, true); + case SNDRV_PCM_IOCTL_STATUS_COMPAT32: + return snd_pcm_status_user32(substream, argp, false); + case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT32: + return snd_pcm_status_user32(substream, argp, true); case SNDRV_PCM_IOCTL_SYNC_PTR32: return snd_pcm_ioctl_sync_ptr_compat(substream, argp); case SNDRV_PCM_IOCTL_CHANNEL_INFO32: @@ -702,11 +654,11 @@ static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned l return snd_pcm_ioctl_rewind_compat(substream, argp); case SNDRV_PCM_IOCTL_FORWARD32: return snd_pcm_ioctl_forward_compat(substream, argp); + case SNDRV_PCM_IOCTL_STATUS_COMPAT64: + return snd_pcm_status_user_compat64(substream, argp, false); + case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64: + return snd_pcm_status_user_compat64(substream, argp, true); #ifdef CONFIG_X86_X32 - case SNDRV_PCM_IOCTL_STATUS_X32: - return snd_pcm_status_user_x32(substream, argp, false); - case SNDRV_PCM_IOCTL_STATUS_EXT_X32: - return snd_pcm_status_user_x32(substream, argp, true); case SNDRV_PCM_IOCTL_SYNC_PTR_X32: return snd_pcm_ioctl_sync_ptr_x32(substream, argp); case SNDRV_PCM_IOCTL_CHANNEL_INFO_X32: diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index 7d0fe30f1658..2c8c9b91677a 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -852,8 +852,8 @@ snd_pcm_calc_delay(struct snd_pcm_substream *substream) return delay + substream->runtime->delay; }
-int snd_pcm_status(struct snd_pcm_substream *substream, - struct snd_pcm_status *status) +int snd_pcm_status64(struct snd_pcm_substream *substream, + struct snd_pcm_status64 *status) { struct snd_pcm_runtime *runtime = substream->runtime;
@@ -879,14 +879,22 @@ int snd_pcm_status(struct snd_pcm_substream *substream, status->suspended_state = runtime->status->suspended_state; if (status->state == SNDRV_PCM_STATE_OPEN) goto _end; - status->trigger_tstamp = timespec64_to_timespec(runtime->trigger_tstamp); + status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec; + status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec; if (snd_pcm_running(substream)) { snd_pcm_update_hw_ptr(substream); if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { - status->tstamp = runtime->status->tstamp; - status->driver_tstamp = timespec64_to_timespec(runtime->driver_tstamp); - status->audio_tstamp = - runtime->status->audio_tstamp; + status->tstamp_sec = runtime->status->tstamp.tv_sec; + status->tstamp_nsec = + runtime->status->tstamp.tv_nsec; + status->driver_tstamp_sec = + runtime->driver_tstamp.tv_sec; + status->driver_tstamp_nsec = + runtime->driver_tstamp.tv_nsec; + status->audio_tstamp_sec = + runtime->status->audio_tstamp.tv_sec; + status->audio_tstamp_nsec = + runtime->status->audio_tstamp.tv_nsec; if (runtime->audio_tstamp_report.valid == 1) /* backwards compatibility, no report provided in COMPAT mode */ snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, @@ -901,7 +909,8 @@ int snd_pcm_status(struct snd_pcm_substream *substream, struct timespec64 tstamp;
snd_pcm_gettime(runtime, &tstamp); - status->tstamp = timespec64_to_timespec(tstamp); + status->tstamp_sec = tstamp.tv_sec; + status->tstamp_nsec = tstamp.tv_nsec; } } _tstamp_end: @@ -919,11 +928,11 @@ int snd_pcm_status(struct snd_pcm_substream *substream, return 0; }
-static int snd_pcm_status_user(struct snd_pcm_substream *substream, - struct snd_pcm_status __user * _status, - bool ext) +static int snd_pcm_status_user64(struct snd_pcm_substream *substream, + struct snd_pcm_status64 __user * _status, + bool ext) { - struct snd_pcm_status status; + struct snd_pcm_status64 status; int res;
memset(&status, 0, sizeof(status)); @@ -935,7 +944,7 @@ static int snd_pcm_status_user(struct snd_pcm_substream *substream, if (ext && get_user(status.audio_tstamp_data, (u32 __user *)(&_status->audio_tstamp_data))) return -EFAULT; - res = snd_pcm_status(substream, &status); + res = snd_pcm_status64(substream, &status); if (res < 0) return res; if (copy_to_user(_status, &status, sizeof(status))) @@ -943,6 +952,55 @@ static int snd_pcm_status_user(struct snd_pcm_substream *substream, return 0; }
+static int snd_pcm_status_user32(struct snd_pcm_substream *substream, + struct snd_pcm_status32 __user * _status, + bool ext) +{ + struct snd_pcm_status64 status64; + struct snd_pcm_status32 status32; + int res; + + memset(&status64, 0, sizeof(status64)); + memset(&status32, 0, sizeof(status32)); + /* + * with extension, parameters are read/write, + * get audio_tstamp_data from user, + * ignore rest of status structure + */ + if (ext && get_user(status64.audio_tstamp_data, + (u32 __user *)(&_status->audio_tstamp_data))) + return -EFAULT; + res = snd_pcm_status64(substream, &status64); + if (res < 0) + return res; + + status32 = (struct snd_pcm_status32) { + .state = status64.state, + .trigger_tstamp_sec = status64.trigger_tstamp_sec, + .trigger_tstamp_nsec = status64.trigger_tstamp_nsec, + .tstamp_sec = status64.tstamp_sec, + .tstamp_nsec = status64.tstamp_nsec, + .appl_ptr = status64.appl_ptr, + .hw_ptr = status64.hw_ptr, + .delay = status64.delay, + .avail = status64.avail, + .avail_max = status64.avail_max, + .overrange = status64.overrange, + .suspended_state = status64.suspended_state, + .audio_tstamp_data = status64.audio_tstamp_data, + .audio_tstamp_sec = status64.audio_tstamp_sec, + .audio_tstamp_nsec = status64.audio_tstamp_nsec, + .driver_tstamp_sec = status64.audio_tstamp_sec, + .driver_tstamp_nsec = status64.audio_tstamp_nsec, + .audio_tstamp_accuracy = status64.audio_tstamp_accuracy, + }; + + if (copy_to_user(_status, &status32, sizeof(status32))) + return -EFAULT; + + return 0; +} + static int snd_pcm_channel_info(struct snd_pcm_substream *substream, struct snd_pcm_channel_info * info) { @@ -2917,10 +2975,14 @@ static int snd_pcm_common_ioctl(struct file *file, return snd_pcm_hw_free(substream); case SNDRV_PCM_IOCTL_SW_PARAMS: return snd_pcm_sw_params_user(substream, arg); - case SNDRV_PCM_IOCTL_STATUS: - return snd_pcm_status_user(substream, arg, false); - case SNDRV_PCM_IOCTL_STATUS_EXT: - return snd_pcm_status_user(substream, arg, true); + case SNDRV_PCM_IOCTL_STATUS32: + return snd_pcm_status_user32(substream, arg, false); + case SNDRV_PCM_IOCTL_STATUS_EXT32: + return snd_pcm_status_user32(substream, arg, true); + case SNDRV_PCM_IOCTL_STATUS64: + return snd_pcm_status_user64(substream, arg, false); + case SNDRV_PCM_IOCTL_STATUS_EXT64: + return snd_pcm_status_user64(substream, arg, true); case SNDRV_PCM_IOCTL_CHANNEL_INFO: return snd_pcm_channel_info_user(substream, arg); case SNDRV_PCM_IOCTL_PREPARE:
From: Baolin Wang baolin.wang@linaro.org
The struct snd_rawmidi_status will use 'timespec' type variables to record timestamp, which is not year 2038 safe on 32bits system.
Thus we introduced 'struct snd_rawmidi_status32' and 'struct snd_rawmidi_status64' to handle 32bit time_t and 64bit time_t in native mode, which replace timespec with s64 type.
In compat mode, we renamed or introduced new structures to handle 32bit/64bit time_t in compatible mode. The 'struct snd_rawmidi_status32' and snd_rawmidi_ioctl_status32() are used to handle 32bit time_t in compat mode. 'struct compat_snd_rawmidi_status64' is used to handle 64bit time_t.
When glibc changes time_t to 64-bit, any recompiled program will issue ioctl commands that the kernel does not understand without this patch.
Signed-off-by: Baolin Wang baolin.wang@linaro.org Signed-off-by: Arnd Bergmann arnd@arndb.de --- include/uapi/sound/asound.h | 3 + sound/core/rawmidi.c | 132 ++++++++++++++++++++++++++++-------- sound/core/rawmidi_compat.c | 87 ++++++------------------ 3 files changed, 128 insertions(+), 94 deletions(-)
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 7b74524f9406..cb830813da5d 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -651,13 +651,16 @@ struct snd_rawmidi_params { unsigned char reserved[16]; /* reserved for future use */ };
+#ifndef __KERNEL__ struct snd_rawmidi_status { int stream; + unsigned char pad1[sizeof(time_t) - sizeof(int)]; struct timespec tstamp; /* Timestamp */ size_t avail; /* available bytes */ size_t xruns; /* count of overruns since last status (in bytes) */ unsigned char reserved[16]; /* reserved for future use */ }; +#endif
#define SNDRV_RAWMIDI_IOCTL_PVERSION _IOR('W', 0x00, int) #define SNDRV_RAWMIDI_IOCTL_INFO _IOR('W', 0x01, struct snd_rawmidi_info) diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c index 8a12a7538d63..cd9bbb546846 100644 --- a/sound/core/rawmidi.c +++ b/sound/core/rawmidi.c @@ -50,6 +50,29 @@ static DEFINE_MUTEX(register_mutex); #define rmidi_dbg(rmidi, fmt, args...) \ dev_dbg(&(rmidi)->dev, fmt, ##args)
+struct snd_rawmidi_status32 { + s32 stream; + s32 tstamp_sec; /* Timestamp */ + s32 tstamp_nsec; + u32 avail; /* available bytes */ + u32 xruns; /* count of overruns since last status (in bytes) */ + unsigned char reserved[16]; /* reserved for future use */ +}; + +#define SNDRV_RAWMIDI_IOCTL_STATUS32 _IOWR('W', 0x20, struct snd_rawmidi_status32) + +struct snd_rawmidi_status64 { + int stream; + u8 rsvd[4]; /* alignment */ + s64 tstamp_sec; /* Timestamp */ + s64 tstamp_nsec; + size_t avail; /* available bytes */ + size_t xruns; /* count of overruns since last status (in bytes) */ + unsigned char reserved[16]; /* reserved for future use */ +}; + +#define SNDRV_RAWMIDI_IOCTL_STATUS64 _IOWR('W', 0x20, struct snd_rawmidi_status64) + static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device) { struct snd_rawmidi *rawmidi; @@ -677,7 +700,7 @@ int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, EXPORT_SYMBOL(snd_rawmidi_input_params);
static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream, - struct snd_rawmidi_status *status) + struct snd_rawmidi_status64 *status) { struct snd_rawmidi_runtime *runtime = substream->runtime;
@@ -690,7 +713,7 @@ static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream, }
static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream, - struct snd_rawmidi_status *status) + struct snd_rawmidi_status64 *status) { struct snd_rawmidi_runtime *runtime = substream->runtime;
@@ -704,6 +727,80 @@ static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream, return 0; }
+static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile, + struct snd_rawmidi_status32 __user *argp) +{ + int err = 0; + struct snd_rawmidi_status32 __user *status = argp; + struct snd_rawmidi_status32 status32; + struct snd_rawmidi_status64 status64; + + if (copy_from_user(&status32, argp, + sizeof(struct snd_rawmidi_status32))) + return -EFAULT; + + switch (status32.stream) { + case SNDRV_RAWMIDI_STREAM_OUTPUT: + if (rfile->output == NULL) + return -EINVAL; + err = snd_rawmidi_output_status(rfile->output, &status64); + break; + case SNDRV_RAWMIDI_STREAM_INPUT: + if (rfile->input == NULL) + return -EINVAL; + err = snd_rawmidi_input_status(rfile->input, &status64); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + + status32 = (struct snd_rawmidi_status32) { + .stream = status64.stream, + .tstamp_sec = status64.tstamp_sec, + .tstamp_nsec = status64.tstamp_nsec, + .avail = status64.avail, + .xruns = status64.xruns, + }; + + if (copy_to_user(status, &status32, sizeof(*status))) + return -EFAULT; + + return 0; +} + +static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile, + struct snd_rawmidi_status64 __user *argp) +{ + int err = 0; + struct snd_rawmidi_status64 status; + + if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64))) + return -EFAULT; + + switch (status.stream) { + case SNDRV_RAWMIDI_STREAM_OUTPUT: + if (rfile->output == NULL) + return -EINVAL; + err = snd_rawmidi_output_status(rfile->output, &status); + break; + case SNDRV_RAWMIDI_STREAM_INPUT: + if (rfile->input == NULL) + return -EINVAL; + err = snd_rawmidi_input_status(rfile->input, &status); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + if (copy_to_user(argp, &status, + sizeof(struct snd_rawmidi_status64))) + return -EFAULT; + return 0; +} + static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct snd_rawmidi_file *rfile; @@ -750,33 +847,10 @@ static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long return -EINVAL; } } - case SNDRV_RAWMIDI_IOCTL_STATUS: - { - int err = 0; - struct snd_rawmidi_status status; - - if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status))) - return -EFAULT; - switch (status.stream) { - case SNDRV_RAWMIDI_STREAM_OUTPUT: - if (rfile->output == NULL) - return -EINVAL; - err = snd_rawmidi_output_status(rfile->output, &status); - break; - case SNDRV_RAWMIDI_STREAM_INPUT: - if (rfile->input == NULL) - return -EINVAL; - err = snd_rawmidi_input_status(rfile->input, &status); - break; - default: - return -EINVAL; - } - if (err < 0) - return err; - if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status))) - return -EFAULT; - return 0; - } + case SNDRV_RAWMIDI_IOCTL_STATUS32: + return snd_rawmidi_ioctl_status32(rfile, argp); + case SNDRV_RAWMIDI_IOCTL_STATUS64: + return snd_rawmidi_ioctl_status64(rfile, argp); case SNDRV_RAWMIDI_IOCTL_DROP: { int val; diff --git a/sound/core/rawmidi_compat.c b/sound/core/rawmidi_compat.c index 66eee61674b6..7397130976d0 100644 --- a/sound/core/rawmidi_compat.c +++ b/sound/core/rawmidi_compat.c @@ -41,19 +41,22 @@ static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile, return -EINVAL; }
-struct snd_rawmidi_status32 { +struct compat_snd_rawmidi_status64 { s32 stream; - struct compat_timespec tstamp; + u8 rsvd[4]; /* alignment */ + s64 tstamp_sec; + s64 tstamp_nsec; u32 avail; u32 xruns; unsigned char reserved[16]; } __attribute__((packed));
-static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile, - struct snd_rawmidi_status32 __user *src) +static int snd_rawmidi_ioctl_status_compat64(struct snd_rawmidi_file *rfile, + struct compat_snd_rawmidi_status64 __user *src) { int err; - struct snd_rawmidi_status status; + struct snd_rawmidi_status64 status; + struct compat_snd_rawmidi_status64 compat_status;
if (get_user(status.stream, &src->stream)) return -EFAULT; @@ -75,68 +78,24 @@ static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile, if (err < 0) return err;
- if (compat_put_timespec(&status.tstamp, &src->tstamp) || - put_user(status.avail, &src->avail) || - put_user(status.xruns, &src->xruns)) - return -EFAULT; - - return 0; -} - -#ifdef CONFIG_X86_X32 -/* X32 ABI has 64bit timespec and 64bit alignment */ -struct snd_rawmidi_status_x32 { - s32 stream; - u32 rsvd; /* alignment */ - struct timespec tstamp; - u32 avail; - u32 xruns; - unsigned char reserved[16]; -} __attribute__((packed)); - -#define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst)) - -static int snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file *rfile, - struct snd_rawmidi_status_x32 __user *src) -{ - int err; - struct snd_rawmidi_status status; - - if (get_user(status.stream, &src->stream)) - return -EFAULT; - - switch (status.stream) { - case SNDRV_RAWMIDI_STREAM_OUTPUT: - if (!rfile->output) - return -EINVAL; - err = snd_rawmidi_output_status(rfile->output, &status); - break; - case SNDRV_RAWMIDI_STREAM_INPUT: - if (!rfile->input) - return -EINVAL; - err = snd_rawmidi_input_status(rfile->input, &status); - break; - default: - return -EINVAL; - } - if (err < 0) - return err; + compat_status = (struct compat_snd_rawmidi_status64) { + .stream = status.stream, + .tstamp_sec = status.tstamp_sec, + .tstamp_nsec = status.tstamp_nsec, + .avail = status.avail, + .xruns = status.xruns, + };
- if (put_timespec(&status.tstamp, &src->tstamp) || - put_user(status.avail, &src->avail) || - put_user(status.xruns, &src->xruns)) + if (copy_to_user(src, &compat_status, sizeof(*src))) return -EFAULT;
return 0; } -#endif /* CONFIG_X86_X32 */
enum { SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32), - SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32), -#ifdef CONFIG_X86_X32 - SNDRV_RAWMIDI_IOCTL_STATUS_X32 = _IOWR('W', 0x20, struct snd_rawmidi_status_x32), -#endif /* CONFIG_X86_X32 */ + SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT32 = _IOWR('W', 0x20, struct snd_rawmidi_status32), + SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64 = _IOWR('W', 0x20, struct compat_snd_rawmidi_status64), };
static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) @@ -153,12 +112,10 @@ static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsign return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp); case SNDRV_RAWMIDI_IOCTL_PARAMS32: return snd_rawmidi_ioctl_params_compat(rfile, argp); - case SNDRV_RAWMIDI_IOCTL_STATUS32: - return snd_rawmidi_ioctl_status_compat(rfile, argp); -#ifdef CONFIG_X86_X32 - case SNDRV_RAWMIDI_IOCTL_STATUS_X32: - return snd_rawmidi_ioctl_status_x32(rfile, argp); -#endif /* CONFIG_X86_X32 */ + case SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT32: + return snd_rawmidi_ioctl_status32(rfile, argp); + case SNDRV_RAWMIDI_IOCTL_STATUS_COMPAT64: + return snd_rawmidi_ioctl_status_compat64(rfile, argp); } return -ENOIOCTLCMD; }
On Tue, 12 Nov 2019 16:16:39 +0100, Arnd Bergmann wrote:
From: Baolin Wang baolin.wang@linaro.org
The struct snd_rawmidi_status will use 'timespec' type variables to record timestamp, which is not year 2038 safe on 32bits system.
Thus we introduced 'struct snd_rawmidi_status32' and 'struct snd_rawmidi_status64' to handle 32bit time_t and 64bit time_t in native mode, which replace timespec with s64 type.
In compat mode, we renamed or introduced new structures to handle 32bit/64bit time_t in compatible mode. The 'struct snd_rawmidi_status32' and snd_rawmidi_ioctl_status32() are used to handle 32bit time_t in compat mode. 'struct compat_snd_rawmidi_status64' is used to handle 64bit time_t.
When glibc changes time_t to 64-bit, any recompiled program will issue ioctl commands that the kernel does not understand without this patch.
Signed-off-by: Baolin Wang baolin.wang@linaro.org Signed-off-by: Arnd Bergmann arnd@arndb.de
include/uapi/sound/asound.h | 3 + sound/core/rawmidi.c | 132 ++++++++++++++++++++++++++++-------- sound/core/rawmidi_compat.c | 87 ++++++------------------ 3 files changed, 128 insertions(+), 94 deletions(-)
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 7b74524f9406..cb830813da5d 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -651,13 +651,16 @@ struct snd_rawmidi_params { unsigned char reserved[16]; /* reserved for future use */ };
+#ifndef __KERNEL__ struct snd_rawmidi_status { int stream;
- unsigned char pad1[sizeof(time_t) - sizeof(int)]; struct timespec tstamp; /* Timestamp */ size_t avail; /* available bytes */ size_t xruns; /* count of overruns since last status (in bytes) */ unsigned char reserved[16]; /* reserved for future use */
};
Can we use union instead of padding? Something like:
struct snd_rawmidi_status { union { int stream; time_t stream_alignment; }; struct timespec tstamp; /* Timestamp */ ....
thanks,
Takashi
On Tue, Nov 12, 2019 at 5:38 PM Takashi Iwai tiwai@suse.de wrote:
On Tue, 12 Nov 2019 16:16:39 +0100, Arnd Bergmann wrote:
+#ifndef __KERNEL__ struct snd_rawmidi_status { int stream;
unsigned char pad1[sizeof(time_t) - sizeof(int)]; struct timespec tstamp; /* Timestamp */ size_t avail; /* available bytes */ size_t xruns; /* count of overruns since last status (in bytes) */ unsigned char reserved[16]; /* reserved for future use */
};
Can we use union instead of padding? Something like:
struct snd_rawmidi_status { union { int stream; time_t stream_alignment; }; struct timespec tstamp; /* Timestamp */ ....
I think this would work most of the time, though I don't feel this is more readable than the other version.
More importantly, it requires compiling user applications with GNU extensions (--std=gnu89 or higher) or C11, but not C99, so this could be a problem for some applications.
If you feel there is a problem with the padding syntax, how about enclosing it in a typedef like:
typedef struct { char pad[sizeof(time_t) - sizeof(int)]; } __time_pad;
This typedef could be used in several structures from the other patches as well.
Arnd
On Tue, 12 Nov 2019 21:04:10 +0100, Arnd Bergmann wrote:
On Tue, Nov 12, 2019 at 5:38 PM Takashi Iwai tiwai@suse.de wrote:
On Tue, 12 Nov 2019 16:16:39 +0100, Arnd Bergmann wrote:
+#ifndef __KERNEL__ struct snd_rawmidi_status { int stream;
unsigned char pad1[sizeof(time_t) - sizeof(int)]; struct timespec tstamp; /* Timestamp */ size_t avail; /* available bytes */ size_t xruns; /* count of overruns since last status (in bytes) */ unsigned char reserved[16]; /* reserved for future use */
};
Can we use union instead of padding? Something like:
struct snd_rawmidi_status { union { int stream; time_t stream_alignment; }; struct timespec tstamp; /* Timestamp */ ....
I think this would work most of the time, though I don't feel this is more readable than the other version.
More importantly, it requires compiling user applications with GNU extensions (--std=gnu89 or higher) or C11, but not C99, so this could be a problem for some applications.
OK, fair enough.
If you feel there is a problem with the padding syntax, how about enclosing it in a typedef like:
typedef struct { char pad[sizeof(time_t) - sizeof(int)]; } __time_pad;
This typedef could be used in several structures from the other patches as well.
Yes, that improves the readability.
thanks,
Takashi
On Tue, Nov 12, 2019 at 9:26 PM Takashi Iwai tiwai@suse.de wrote:
On Tue, 12 Nov 2019 21:04:10 +0100, Arnd Bergmann wrote:
On Tue, Nov 12, 2019 at 5:38 PM Takashi Iwai tiwai@suse.de wrote:
On Tue, 12 Nov 2019 16:16:39 +0100, Arnd Bergmann wrote:
If you feel there is a problem with the padding syntax, how about enclosing it in a typedef like:
typedef struct { char pad[sizeof(time_t) - sizeof(int)]; } __time_pad;
This typedef could be used in several structures from the other patches as well.
Yes, that improves the readability.
Ok, added this change to all instances, along with a description in the changelog when I add the typedef.
Arnd
From: Baolin Wang baolin.wang@linaro.org
The struct snd_timer_tread will use 'timespec' type variables to record timestamp, which is not year 2038 safe on 32bits system.
Since the struct snd_timer_tread is passed through read() rather than ioctl(), and the read syscall has no command number that lets us pick between the 32-bit or 64-bit version of this structure.
Thus we introduced one new command SNDRV_TIMER_IOCTL_TREAD64 and new struct snd_timer_tread64 replacing timespec with s64 type to handle 64bit time_t. That means we will set tu->tread = TREAD_FORMAT_64BIT when user space has a 64bit time_t, then we will copy to user with struct snd_timer_tread64. Otherwise we will use 32bit time_t variables when copying to user.
Moreover this patch replaces timespec type with timespec64 type and related y2038 safe APIs.
Signed-off-by: Baolin Wang baolin.wang@linaro.org Signed-off-by: Arnd Bergmann arnd@arndb.de --- include/uapi/sound/asound.h | 15 +++- sound/core/timer.c | 149 +++++++++++++++++++++++++++--------- sound/core/timer_compat.c | 5 +- 3 files changed, 130 insertions(+), 39 deletions(-)
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index cb830813da5d..8ce73fb629e8 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -780,7 +780,7 @@ struct snd_timer_status {
#define SNDRV_TIMER_IOCTL_PVERSION _IOR('T', 0x00, int) #define SNDRV_TIMER_IOCTL_NEXT_DEVICE _IOWR('T', 0x01, struct snd_timer_id) -#define SNDRV_TIMER_IOCTL_TREAD _IOW('T', 0x02, int) +#define SNDRV_TIMER_IOCTL_TREAD_OLD _IOW('T', 0x02, int) #define SNDRV_TIMER_IOCTL_GINFO _IOWR('T', 0x03, struct snd_timer_ginfo) #define SNDRV_TIMER_IOCTL_GPARAMS _IOW('T', 0x04, struct snd_timer_gparams) #define SNDRV_TIMER_IOCTL_GSTATUS _IOWR('T', 0x05, struct snd_timer_gstatus) @@ -793,6 +793,15 @@ struct snd_timer_status { #define SNDRV_TIMER_IOCTL_STOP _IO('T', 0xa1) #define SNDRV_TIMER_IOCTL_CONTINUE _IO('T', 0xa2) #define SNDRV_TIMER_IOCTL_PAUSE _IO('T', 0xa3) +#define SNDRV_TIMER_IOCTL_TREAD64 _IOW('T', 0xa4, int) + +#if __BITS_PER_LONG == 64 +#define SNDRV_TIMER_IOCTL_TREAD SNDRV_TIMER_IOCTL_TREAD_OLD +#else +#define SNDRV_TIMER_IOCTL_TREAD ((sizeof(__kernel_long_t) >= sizeof(time_t)) ? \ + SNDRV_TIMER_IOCTL_TREAD_OLD : \ + SNDRV_TIMER_IOCTL_TREAD64) +#endif
struct snd_timer_read { unsigned int resolution; @@ -818,11 +827,15 @@ enum { SNDRV_TIMER_EVENT_MRESUME = SNDRV_TIMER_EVENT_RESUME + 10, };
+#ifndef __KERNEL__ struct snd_timer_tread { int event; + __u8 pad1[sizeof(time_t) - sizeof(int)]; struct timespec tstamp; unsigned int val; + __u8 pad2[sizeof(time_t) - sizeof(unsigned int)]; }; +#endif
/**************************************************************************** * * diff --git a/sound/core/timer.c b/sound/core/timer.c index 921f4ae2f9bf..19a68cbbfbcb 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -44,6 +44,28 @@ MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for t MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); MODULE_ALIAS("devname:snd/timer");
+enum timer_tread_format { + TREAD_FORMAT_NONE = 0, + TREAD_FORMAT_TIME64, + TREAD_FORMAT_TIME32, +}; + +struct snd_timer_tread32 { + int event; + s32 tstamp_sec; + s32 tstamp_nsec; + unsigned int val; +}; + +struct snd_timer_tread64 { + int event; + u8 pad1[4]; + s64 tstamp_sec; + s64 tstamp_nsec; + unsigned int val; + u8 pad2[4]; +}; + struct snd_timer_user { struct snd_timer_instance *timeri; int tread; /* enhanced read with timestamps and events */ @@ -55,7 +77,7 @@ struct snd_timer_user { int queue_size; bool disconnected; struct snd_timer_read *queue; - struct snd_timer_tread *tqueue; + struct snd_timer_tread64 *tqueue; spinlock_t qlock; unsigned long last_resolution; unsigned int filter; @@ -1326,7 +1348,7 @@ static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, }
static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, - struct snd_timer_tread *tread) + struct snd_timer_tread64 *tread) { if (tu->qused >= tu->queue_size) { tu->overrun++; @@ -1343,7 +1365,7 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, unsigned long resolution) { struct snd_timer_user *tu = timeri->callback_data; - struct snd_timer_tread r1; + struct snd_timer_tread64 r1; unsigned long flags;
if (event >= SNDRV_TIMER_EVENT_START && @@ -1353,7 +1375,8 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, return; memset(&r1, 0, sizeof(r1)); r1.event = event; - r1.tstamp = timespec64_to_timespec(*tstamp); + r1.tstamp_sec = tstamp->tv_sec; + r1.tstamp_nsec = tstamp->tv_nsec; r1.val = resolution; spin_lock_irqsave(&tu->qlock, flags); snd_timer_user_append_to_tqueue(tu, &r1); @@ -1375,7 +1398,7 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, unsigned long ticks) { struct snd_timer_user *tu = timeri->callback_data; - struct snd_timer_tread *r, r1; + struct snd_timer_tread64 *r, r1; struct timespec64 tstamp; int prev, append = 0;
@@ -1396,7 +1419,8 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) { r1.event = SNDRV_TIMER_EVENT_RESOLUTION; - r1.tstamp = timespec64_to_timespec(tstamp); + r1.tstamp_sec = tstamp.tv_sec; + r1.tstamp_nsec = tstamp.tv_nsec; r1.val = resolution; snd_timer_user_append_to_tqueue(tu, &r1); tu->last_resolution = resolution; @@ -1410,14 +1434,16 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; r = &tu->tqueue[prev]; if (r->event == SNDRV_TIMER_EVENT_TICK) { - r->tstamp = timespec64_to_timespec(tstamp); + r->tstamp_sec = tstamp.tv_sec; + r->tstamp_nsec = tstamp.tv_nsec; r->val += ticks; append++; goto __wake; } } r1.event = SNDRV_TIMER_EVENT_TICK; - r1.tstamp = timespec64_to_timespec(tstamp); + r1.tstamp_sec = tstamp.tv_sec; + r1.tstamp_nsec = tstamp.tv_nsec; r1.val = ticks; snd_timer_user_append_to_tqueue(tu, &r1); append++; @@ -1432,7 +1458,7 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, static int realloc_user_queue(struct snd_timer_user *tu, int size) { struct snd_timer_read *queue = NULL; - struct snd_timer_tread *tqueue = NULL; + struct snd_timer_tread64 *tqueue = NULL;
if (tu->tread) { tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL); @@ -1860,11 +1886,11 @@ static int snd_timer_user_params(struct file *file, tu->qhead = tu->qtail = tu->qused = 0; if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { if (tu->tread) { - struct snd_timer_tread tread; + struct snd_timer_tread64 tread; memset(&tread, 0, sizeof(tread)); tread.event = SNDRV_TIMER_EVENT_EARLY; - tread.tstamp.tv_sec = 0; - tread.tstamp.tv_nsec = 0; + tread.tstamp_sec = 0; + tread.tstamp_nsec = 0; tread.val = 0; snd_timer_user_append_to_tqueue(tu, &tread); } else { @@ -1994,6 +2020,36 @@ static int snd_timer_user_pause(struct file *file) return 0; }
+static int snd_timer_user_tread(void __user *argp, struct snd_timer_user *tu, + unsigned int cmd, bool compat) +{ + int __user *p = argp; + int xarg, old_tread; + + if (tu->timeri) /* too late */ + return -EBUSY; + if (get_user(xarg, p)) + return -EFAULT; + + old_tread = tu->tread; + + if (!xarg) + tu->tread = TREAD_FORMAT_NONE; + else if (cmd == SNDRV_TIMER_IOCTL_TREAD64 || + (IS_ENABLED(CONFIG_64BITS) && !compat)) + tu->tread = TREAD_FORMAT_TIME64; + else + tu->tread = TREAD_FORMAT_TIME32; + + if (tu->tread != old_tread && + realloc_user_queue(tu, tu->queue_size) < 0) { + tu->tread = old_tread; + return -ENOMEM; + } + + return 0; +} + enum { SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), @@ -2002,7 +2058,7 @@ enum { };
static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) + unsigned long arg, bool compat) { struct snd_timer_user *tu; void __user *argp = (void __user *)arg; @@ -2014,23 +2070,9 @@ static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; case SNDRV_TIMER_IOCTL_NEXT_DEVICE: return snd_timer_user_next_device(argp); - case SNDRV_TIMER_IOCTL_TREAD: - { - int xarg, old_tread; - - if (tu->timeri) /* too late */ - return -EBUSY; - if (get_user(xarg, p)) - return -EFAULT; - old_tread = tu->tread; - tu->tread = xarg ? 1 : 0; - if (tu->tread != old_tread && - realloc_user_queue(tu, tu->queue_size) < 0) { - tu->tread = old_tread; - return -ENOMEM; - } - return 0; - } + case SNDRV_TIMER_IOCTL_TREAD_OLD: + case SNDRV_TIMER_IOCTL_TREAD64: + return snd_timer_user_tread(argp, tu, cmd, compat); case SNDRV_TIMER_IOCTL_GINFO: return snd_timer_user_ginfo(file, argp); case SNDRV_TIMER_IOCTL_GPARAMS: @@ -2070,7 +2112,7 @@ static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, long ret;
mutex_lock(&tu->ioctl_lock); - ret = __snd_timer_user_ioctl(file, cmd, arg); + ret = __snd_timer_user_ioctl(file, cmd, arg, false); mutex_unlock(&tu->ioctl_lock); return ret; } @@ -2086,13 +2128,28 @@ static int snd_timer_user_fasync(int fd, struct file * file, int on) static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset) { + struct snd_timer_tread64 *tread; + struct snd_timer_tread32 tread32; struct snd_timer_user *tu; long result = 0, unit; int qhead; int err = 0;
tu = file->private_data; - unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); + switch (tu->tread) { + case TREAD_FORMAT_TIME64: + unit = sizeof(struct snd_timer_tread64); + break; + case TREAD_FORMAT_TIME32: + unit = sizeof(struct snd_timer_tread32); + break; + case TREAD_FORMAT_NONE: + unit = sizeof(struct snd_timer_read); + break; + default: + return -ENOTSUPP; + } + mutex_lock(&tu->ioctl_lock); spin_lock_irq(&tu->qlock); while ((long)count - result >= unit) { @@ -2131,14 +2188,34 @@ static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, tu->qused--; spin_unlock_irq(&tu->qlock);
- if (tu->tread) { - if (copy_to_user(buffer, &tu->tqueue[qhead], - sizeof(struct snd_timer_tread))) + tread = &tu->tqueue[qhead]; + + switch (tu->tread) { + case TREAD_FORMAT_TIME64: + if (copy_to_user(buffer, tread, + sizeof(struct snd_timer_tread64))) err = -EFAULT; - } else { + break; + case TREAD_FORMAT_TIME32: + memset(&tread32, 0, sizeof(tread32)); + tread32 = (struct snd_timer_tread32) { + .event = tread->event, + .tstamp_sec = tread->tstamp_sec, + .tstamp_sec = tread->tstamp_nsec, + .val = tread->val, + }; + + if (copy_to_user(buffer, &tread32, sizeof(tread32))) + err = -EFAULT; + break; + case TREAD_FORMAT_NONE: if (copy_to_user(buffer, &tu->queue[qhead], sizeof(struct snd_timer_read))) err = -EFAULT; + break; + default: + err = -ENOTSUPP; + break; }
spin_lock_irq(&tu->qlock); diff --git a/sound/core/timer_compat.c b/sound/core/timer_compat.c index 20eef5bc304b..0103d16f6f9f 100644 --- a/sound/core/timer_compat.c +++ b/sound/core/timer_compat.c @@ -83,7 +83,8 @@ static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
switch (cmd) { case SNDRV_TIMER_IOCTL_PVERSION: - case SNDRV_TIMER_IOCTL_TREAD: + case SNDRV_TIMER_IOCTL_TREAD_OLD: + case SNDRV_TIMER_IOCTL_TREAD64: case SNDRV_TIMER_IOCTL_GINFO: case SNDRV_TIMER_IOCTL_GSTATUS: case SNDRV_TIMER_IOCTL_SELECT: @@ -97,7 +98,7 @@ static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd, case SNDRV_TIMER_IOCTL_PAUSE: case SNDRV_TIMER_IOCTL_PAUSE_OLD: case SNDRV_TIMER_IOCTL_NEXT_DEVICE: - return __snd_timer_user_ioctl(file, cmd, (unsigned long)argp); + return __snd_timer_user_ioctl(file, cmd, (unsigned long)argp, true); case SNDRV_TIMER_IOCTL_GPARAMS32: return snd_timer_user_gparams_compat(file, argp); case SNDRV_TIMER_IOCTL_INFO32:
This is a preparation patch, moving the compat handler for snd_pcm_ioctl_sync_ptr_compat from pcm_compat.c to pcm_native.c. No other changes are indented.
Signed-off-by: Baolin Wang baolin.wang@linaro.org Signed-off-by: Arnd Bergmann arnd@arndb.de --- sound/core/pcm_compat.c | 98 -------------------------------------- sound/core/pcm_native.c | 101 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 101 insertions(+), 98 deletions(-)
diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c index 2671658442ea..6a2e5ea145e6 100644 --- a/sound/core/pcm_compat.c +++ b/sound/core/pcm_compat.c @@ -83,19 +83,6 @@ struct snd_pcm_sw_params32 { unsigned char reserved[56]; };
-/* recalcuate the boundary within 32bit */ -static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime) -{ - snd_pcm_uframes_t boundary; - - if (! runtime->buffer_size) - return 0; - boundary = runtime->buffer_size; - while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size) - boundary *= 2; - return boundary; -} - static int snd_pcm_ioctl_sw_params_compat(struct snd_pcm_substream *substream, struct snd_pcm_sw_params32 __user *src) { @@ -388,91 +375,6 @@ static int snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream *substream, return err; }
- -struct snd_pcm_mmap_status32 { - s32 state; - s32 pad1; - u32 hw_ptr; - struct compat_timespec tstamp; - s32 suspended_state; - struct compat_timespec audio_tstamp; -} __attribute__((packed)); - -struct snd_pcm_mmap_control32 { - u32 appl_ptr; - u32 avail_min; -}; - -struct snd_pcm_sync_ptr32 { - u32 flags; - union { - struct snd_pcm_mmap_status32 status; - unsigned char reserved[64]; - } s; - union { - struct snd_pcm_mmap_control32 control; - unsigned char reserved[64]; - } c; -} __attribute__((packed)); - -static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream, - struct snd_pcm_sync_ptr32 __user *src) -{ - struct snd_pcm_runtime *runtime = substream->runtime; - volatile struct snd_pcm_mmap_status *status; - volatile struct snd_pcm_mmap_control *control; - u32 sflags; - struct snd_pcm_mmap_control scontrol; - struct snd_pcm_mmap_status sstatus; - snd_pcm_uframes_t boundary; - int err; - - if (snd_BUG_ON(!runtime)) - return -EINVAL; - - if (get_user(sflags, &src->flags) || - get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || - get_user(scontrol.avail_min, &src->c.control.avail_min)) - return -EFAULT; - if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) { - err = snd_pcm_hwsync(substream); - if (err < 0) - return err; - } - status = runtime->status; - control = runtime->control; - boundary = recalculate_boundary(runtime); - if (! boundary) - boundary = 0x7fffffff; - snd_pcm_stream_lock_irq(substream); - /* FIXME: we should consider the boundary for the sync from app */ - if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) - control->appl_ptr = scontrol.appl_ptr; - else - scontrol.appl_ptr = control->appl_ptr % boundary; - if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) - control->avail_min = scontrol.avail_min; - else - scontrol.avail_min = control->avail_min; - sstatus.state = status->state; - sstatus.hw_ptr = status->hw_ptr % boundary; - sstatus.tstamp = status->tstamp; - sstatus.suspended_state = status->suspended_state; - sstatus.audio_tstamp = status->audio_tstamp; - snd_pcm_stream_unlock_irq(substream); - if (put_user(sstatus.state, &src->s.status.state) || - put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) || - compat_put_timespec(&sstatus.tstamp, &src->s.status.tstamp) || - put_user(sstatus.suspended_state, &src->s.status.suspended_state) || - compat_put_timespec(&sstatus.audio_tstamp, - &src->s.status.audio_tstamp) || - put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || - put_user(scontrol.avail_min, &src->c.control.avail_min)) - return -EFAULT; - - return 0; -} - #ifdef CONFIG_X86_X32 /* X32 ABI has 64bit timespec and 64bit alignment */ struct snd_pcm_mmap_status_x32 { diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index 2c8c9b91677a..cad90d9ce9da 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -4,6 +4,7 @@ * Copyright (c) by Jaroslav Kysela perex@perex.cz */
+#include <linux/compat.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/file.h> @@ -2846,6 +2847,106 @@ static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, return 0; }
+#ifdef CONFIG_COMPAT +struct snd_pcm_mmap_status32 { + s32 state; + s32 pad1; + u32 hw_ptr; + struct compat_timespec tstamp; + s32 suspended_state; + struct compat_timespec audio_tstamp; +} __attribute__((packed)); + +struct snd_pcm_mmap_control32 { + u32 appl_ptr; + u32 avail_min; +}; + +struct snd_pcm_sync_ptr32 { + u32 flags; + union { + struct snd_pcm_mmap_status32 status; + unsigned char reserved[64]; + } s; + union { + struct snd_pcm_mmap_control32 control; + unsigned char reserved[64]; + } c; +} __attribute__((packed)); + +/* recalcuate the boundary within 32bit */ +static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime) +{ + snd_pcm_uframes_t boundary; + + if (! runtime->buffer_size) + return 0; + boundary = runtime->buffer_size; + while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size) + boundary *= 2; + return boundary; +} + +static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream, + struct snd_pcm_sync_ptr32 __user *src) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + volatile struct snd_pcm_mmap_status *status; + volatile struct snd_pcm_mmap_control *control; + u32 sflags; + struct snd_pcm_mmap_control scontrol; + struct snd_pcm_mmap_status sstatus; + snd_pcm_uframes_t boundary; + int err; + + if (snd_BUG_ON(!runtime)) + return -EINVAL; + + if (get_user(sflags, &src->flags) || + get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || + get_user(scontrol.avail_min, &src->c.control.avail_min)) + return -EFAULT; + if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) { + err = snd_pcm_hwsync(substream); + if (err < 0) + return err; + } + status = runtime->status; + control = runtime->control; + boundary = recalculate_boundary(runtime); + if (! boundary) + boundary = 0x7fffffff; + snd_pcm_stream_lock_irq(substream); + /* FIXME: we should consider the boundary for the sync from app */ + if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) + control->appl_ptr = scontrol.appl_ptr; + else + scontrol.appl_ptr = control->appl_ptr % boundary; + if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) + control->avail_min = scontrol.avail_min; + else + scontrol.avail_min = control->avail_min; + sstatus.state = status->state; + sstatus.hw_ptr = status->hw_ptr % boundary; + sstatus.tstamp = status->tstamp; + sstatus.suspended_state = status->suspended_state; + sstatus.audio_tstamp = status->audio_tstamp; + snd_pcm_stream_unlock_irq(substream); + if (put_user(sstatus.state, &src->s.status.state) || + put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) || + compat_put_timespec(&sstatus.tstamp, &src->s.status.tstamp) || + put_user(sstatus.suspended_state, &src->s.status.suspended_state) || + compat_put_timespec(&sstatus.audio_tstamp, + &src->s.status.audio_tstamp) || + put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || + put_user(scontrol.avail_min, &src->c.control.avail_min)) + return -EFAULT; + + return 0; +} +#define __SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32), +#endif + static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) { struct snd_pcm_runtime *runtime = substream->runtime;
The snd_pcm_mmap_status and snd_pcm_mmap_control interfaces are one of the trickiest areas to get right when moving to 64-bit time_t in user space.
The snd_pcm_mmap_status structure layout is incompatible with user space that uses a 64-bit time_t, so we need a new layout for it. Since the SNDRV_PCM_IOCTL_SYNC_PTR ioctl combines it with snd_pcm_mmap_control into snd_pcm_sync_ptr, we need to change those two as well.
Both structures are also exported via an mmap() operation on certain architectures, and this suffers from incompatibility between 32-bit and 64-bit user space. As we have to change both structures anyway, this is a good opportunity to fix the mmap() problem as well, so let's standardize on the existing 64-bit layout of the structure where possible.
The downside is that we lose mmap() support for existing 32-bit x86 and powerpc applications, adding that would introduce very noticeable runtime overhead and complexity. My assumption here is that not too many people will miss the removed feature, given that:
- Almost all x86 and powerpc users these days are on 64-bit kernels, the majority of today's 32-bit users are on architectures that never supported mmap (ARM, MIPS, ...). - It never worked in compat mode (it was intentionally disabled there) - The application already needs to work with a fallback to SNDRV_PCM_IOCTL_SYNC_PTR, which will keep working with both the old and new structure layout.
Both the ioctl() and mmap() based interfaces are changed at the same time, as they are based on the same structures. Unlike other interfaces, we change the uapi header to export both the traditional structure and a version that is portable between 32-bit and 64-bit user space code and that corresponds to the existing 64-bit layout. We further check the __USE_TIME_BITS64 macro that will be defined by future C library versions whenever we use the new time_t definition, so any existing user space source code will not see any changes until it gets rebuilt against a new C library. However, the new structures are all visible in addition to the old ones, allowing applications to explicitly request the new structures.
In order to detect the difference between the old snd_pcm_mmap_status and the new __snd_pcm_mmap_status64 structure from the ioctl command number, we rely on one quirk in the structure definition: snd_pcm_mmap_status must be aligned to alignof(time_t), which leads the compiler to insert four bytes of padding in struct snd_pcm_sync_ptr after 'flags' and a corresponding change in the size of snd_pcm_sync_ptr itself. On x86-32 (and only there), the compiler doesn't use 64-bit alignment in structure, so I'm adding an explicit pad in the structure that has no effect on the existing 64-bit architectures but ensures that the layout matches for x86.
The snd_pcm_uframes_t type compatibility requires another hack: we can't easily make that 64 bit wide, so I leave the type as 'unsigned long', but add padding before and after it, to ensure that the data is properly aligned to the respective 64-bit field in the in-kernel structure.
For the SNDRV_PCM_MMAP_OFFSET_STATUS/CONTROL constants that are used as the virtual file offset in the mmap() function, we also have to introduce new constants that depend on hte __USE_TIME_BITS64 macro: The existing macros are renamed to SNDRV_PCM_MMAP_OFFSET_STATUS_OLD and SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD, they continue to work fine on 64-bit architectures, but stop working on native 32-bit user space. The replacement _NEW constants are now used by default for user space built with __USE_TIME_BITS64, those now work on all new kernels for x86, ppc and alpha (32 and 64 bit, native and compat). It might be a good idea for a future alsa-lib to support both the _OLD and _NEW macros and use the corresponding structures directly. Unmodified alsa-lib source code will retain the current behavior, so it will no longer be able to use mmap() for the status/control structures on 32-bit systems, until either the C library gets updated to 64-bit time_t or alsa-lib gets updated to support both mmap() layouts.
Co-developed-with: Baolin Wang baolin.wang@linaro.org Signed-off-by: Baolin Wang baolin.wang@linaro.org Signed-off-by: Arnd Bergmann arnd@arndb.de --- include/uapi/sound/asound.h | 106 ++++++++++++++++++++++++++++++++---- sound/core/pcm_compat.c | 30 +++++----- sound/core/pcm_lib.c | 10 ++-- sound/core/pcm_native.c | 39 ++++++++----- 4 files changed, 143 insertions(+), 42 deletions(-)
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 8ce73fb629e8..d26b70d0fb57 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -35,6 +35,8 @@ #include <time.h> #endif
+#include <asm/byteorder.h> + /* * protocol version */ @@ -301,7 +303,9 @@ typedef int __bitwise snd_pcm_subformat_t; #define SNDRV_PCM_INFO_DRAIN_TRIGGER 0x40000000 /* internal kernel flag - trigger in drain */ #define SNDRV_PCM_INFO_FIFO_IN_FRAMES 0x80000000 /* internal kernel flag - FIFO size is in frames */
- +#if (__BITS_PER_LONG == 32 && defined(__USE_TIME_BITS64)) || defined __KERNEL__ +#define __SND_STRUCT_TIME64 +#endif
typedef int __bitwise snd_pcm_state_t; #define SNDRV_PCM_STATE_OPEN ((__force snd_pcm_state_t) 0) /* stream is open */ @@ -317,8 +321,17 @@ typedef int __bitwise snd_pcm_state_t;
enum { SNDRV_PCM_MMAP_OFFSET_DATA = 0x00000000, - SNDRV_PCM_MMAP_OFFSET_STATUS = 0x80000000, - SNDRV_PCM_MMAP_OFFSET_CONTROL = 0x81000000, + SNDRV_PCM_MMAP_OFFSET_STATUS_OLD = 0x80000000, + SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD = 0x81000000, + SNDRV_PCM_MMAP_OFFSET_STATUS_NEW = 0x82000000, + SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW = 0x83000000, +#ifdef __SND_STRUCT_TIME64 + SNDRV_PCM_MMAP_OFFSET_STATUS = SNDRV_PCM_MMAP_OFFSET_STATUS_NEW, + SNDRV_PCM_MMAP_OFFSET_CONTROL = SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW, +#else + SNDRV_PCM_MMAP_OFFSET_STATUS = SNDRV_PCM_MMAP_OFFSET_STATUS_OLD, + SNDRV_PCM_MMAP_OFFSET_CONTROL = SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD, +#endif };
union snd_pcm_sync_id { @@ -477,16 +490,42 @@ struct snd_pcm_status { }; #endif
-struct snd_pcm_mmap_status { +/* + * For mmap operations, we need the 64-bit layout, both for compat mode, + * and for y2038 compatibility. For 64-bit applications, the two definitions + * are identical, so we keep the traditional version. + */ +#ifdef __SND_STRUCT_TIME64 +#define __snd_pcm_mmap_status64 snd_pcm_mmap_status +#define __snd_pcm_mmap_control64 snd_pcm_mmap_control +#define __snd_pcm_sync_ptr64 snd_pcm_sync_ptr +#define __snd_timespec64 timespec +struct __snd_timespec { + __s32 tv_sec; + __s32 tv_nsec; +}; +#else +#define __snd_pcm_mmap_status snd_pcm_mmap_status +#define __snd_pcm_mmap_control snd_pcm_mmap_control +#define __snd_pcm_sync_ptr snd_pcm_sync_ptr +#define __snd_timespec timespec +struct __snd_timespec64 { + __s64 tv_sec; + __s64 tv_nsec; +}; + +#endif + +struct __snd_pcm_mmap_status { snd_pcm_state_t state; /* RO: state - SNDRV_PCM_STATE_XXXX */ int pad1; /* Needed for 64 bit alignment */ snd_pcm_uframes_t hw_ptr; /* RO: hw ptr (0...boundary-1) */ - struct timespec tstamp; /* Timestamp */ + struct __snd_timespec tstamp; /* Timestamp */ snd_pcm_state_t suspended_state; /* RO: suspended stream state */ - struct timespec audio_tstamp; /* from sample counter or wall clock */ + struct __snd_timespec audio_tstamp; /* from sample counter or wall clock */ };
-struct snd_pcm_mmap_control { +struct __snd_pcm_mmap_control { snd_pcm_uframes_t appl_ptr; /* RW: appl ptr (0...boundary-1) */ snd_pcm_uframes_t avail_min; /* RW: min available frames for wakeup */ }; @@ -495,14 +534,59 @@ struct snd_pcm_mmap_control { #define SNDRV_PCM_SYNC_PTR_APPL (1<<1) /* get appl_ptr from driver (r/w op) */ #define SNDRV_PCM_SYNC_PTR_AVAIL_MIN (1<<2) /* get avail_min from driver */
-struct snd_pcm_sync_ptr { +struct __snd_pcm_sync_ptr { unsigned int flags; union { - struct snd_pcm_mmap_status status; + struct __snd_pcm_mmap_status status; + unsigned char reserved[64]; + } s; + union { + struct __snd_pcm_mmap_control control; + unsigned char reserved[64]; + } c; +}; + +#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN) +typedef char __pad_before_uframe[sizeof(__u64) - sizeof(snd_pcm_uframes_t)]; +typedef char __pad_after_uframe[0]; +#endif + +#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN) +typedef char __pad_before_uframe[0]; +typedef char __pad_after_uframe[sizeof(__u64) - sizeof(snd_pcm_uframes_t)]; +#endif + +struct __snd_pcm_mmap_status64 { + __s32 state; /* RO: state - SNDRV_PCM_STATE_XXXX */ + __u32 pad1; /* Needed for 64 bit alignment */ + __pad_before_uframe __pad1; + snd_pcm_uframes_t hw_ptr; /* RO: hw ptr (0...boundary-1) */ + __pad_after_uframe __pad2; + struct __snd_timespec64 tstamp; /* Timestamp */ + __s32 suspended_state; /* RO: suspended stream state */ + __u32 pad3; /* Needed for 64 bit alignment */ + struct __snd_timespec64 audio_tstamp; /* sample counter or wall clock */ +}; + +struct __snd_pcm_mmap_control64 { + __pad_before_uframe __pad1; + snd_pcm_uframes_t appl_ptr; /* RW: appl ptr (0...boundary-1) */ + __pad_before_uframe __pad2; + + __pad_before_uframe __pad3; + snd_pcm_uframes_t avail_min; /* RW: min available frames for wakeup */ + __pad_after_uframe __pad4; +}; + +struct __snd_pcm_sync_ptr64 { + __u32 flags; + __u32 pad1; + union { + struct __snd_pcm_mmap_status64 status; unsigned char reserved[64]; } s; union { - struct snd_pcm_mmap_control control; + struct __snd_pcm_mmap_control64 control; unsigned char reserved[64]; } c; }; @@ -587,6 +671,8 @@ enum { #define SNDRV_PCM_IOCTL_STATUS _IOR('A', 0x20, struct snd_pcm_status) #define SNDRV_PCM_IOCTL_DELAY _IOR('A', 0x21, snd_pcm_sframes_t) #define SNDRV_PCM_IOCTL_HWSYNC _IO('A', 0x22) +#define __SNDRV_PCM_IOCTL_SYNC_PTR _IOWR('A', 0x23, struct __snd_pcm_sync_ptr) +#define __SNDRV_PCM_IOCTL_SYNC_PTR64 _IOWR('A', 0x23, struct __snd_pcm_sync_ptr64) #define SNDRV_PCM_IOCTL_SYNC_PTR _IOWR('A', 0x23, struct snd_pcm_sync_ptr) #define SNDRV_PCM_IOCTL_STATUS_EXT _IOWR('A', 0x24, struct snd_pcm_status) #define SNDRV_PCM_IOCTL_CHANNEL_INFO _IOR('A', 0x32, struct snd_pcm_channel_info) diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c index 6a2e5ea145e6..967c689fb8da 100644 --- a/sound/core/pcm_compat.c +++ b/sound/core/pcm_compat.c @@ -178,8 +178,6 @@ struct compat_snd_pcm_status64 { unsigned char reserved[52-4*sizeof(s64)]; } __packed;
-#define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst)) - static int snd_pcm_status_user_compat64(struct snd_pcm_substream *substream, struct compat_snd_pcm_status64 __user *src, bool ext) @@ -382,10 +380,12 @@ struct snd_pcm_mmap_status_x32 { s32 pad1; u32 hw_ptr; u32 pad2; /* alignment */ - struct timespec tstamp; + s64 tstamp_sec; + s64 tstamp_nsec; s32 suspended_state; s32 pad3; - struct timespec audio_tstamp; + s64 audio_tstamp_sec; + s64 audio_tstamp_nsec; } __packed;
struct snd_pcm_mmap_control_x32 { @@ -453,9 +453,11 @@ static int snd_pcm_ioctl_sync_ptr_x32(struct snd_pcm_substream *substream, snd_pcm_stream_unlock_irq(substream); if (put_user(sstatus.state, &src->s.status.state) || put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) || - put_timespec(&sstatus.tstamp, &src->s.status.tstamp) || + put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) || + put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) || put_user(sstatus.suspended_state, &src->s.status.suspended_state) || - put_timespec(&sstatus.audio_tstamp, &src->s.status.audio_tstamp) || + put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) || + put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) || put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || put_user(scontrol.avail_min, &src->c.control.avail_min)) return -EFAULT; @@ -480,7 +482,6 @@ enum { SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct snd_xferi32), SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32), SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32), - SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32), SNDRV_PCM_IOCTL_STATUS_COMPAT64 = _IOR('A', 0x20, struct compat_snd_pcm_status64), SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64 = _IOWR('A', 0x24, struct compat_snd_pcm_status64), #ifdef CONFIG_X86_X32 @@ -504,8 +505,8 @@ static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned l
/* * When PCM is used on 32bit mode, we need to disable - * mmap of PCM status/control records because of the size - * incompatibility. + * mmap of the old PCM status/control records because + * of the size incompatibility. */ pcm_file->no_compat_mmap = 1;
@@ -527,6 +528,13 @@ static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned l case SNDRV_PCM_IOCTL_XRUN: case SNDRV_PCM_IOCTL_LINK: case SNDRV_PCM_IOCTL_UNLINK: + case __SNDRV_PCM_IOCTL_SYNC_PTR32: + return snd_pcm_common_ioctl(file, substream, cmd, argp); + case __SNDRV_PCM_IOCTL_SYNC_PTR64: +#ifdef CONFIG_X86_X32 + if (in_x32_syscall()) + return snd_pcm_ioctl_sync_ptr_x32(substream, argp); +#endif /* CONFIG_X86_X32 */ return snd_pcm_common_ioctl(file, substream, cmd, argp); case SNDRV_PCM_IOCTL_HW_REFINE32: return snd_pcm_ioctl_hw_params_compat(substream, 1, argp); @@ -538,8 +546,6 @@ static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned l return snd_pcm_status_user32(substream, argp, false); case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT32: return snd_pcm_status_user32(substream, argp, true); - case SNDRV_PCM_IOCTL_SYNC_PTR32: - return snd_pcm_ioctl_sync_ptr_compat(substream, argp); case SNDRV_PCM_IOCTL_CHANNEL_INFO32: return snd_pcm_ioctl_channel_info_compat(substream, argp); case SNDRV_PCM_IOCTL_WRITEI_FRAMES32: @@ -561,8 +567,6 @@ static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned l case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64: return snd_pcm_status_user_compat64(substream, argp, true); #ifdef CONFIG_X86_X32 - case SNDRV_PCM_IOCTL_SYNC_PTR_X32: - return snd_pcm_ioctl_sync_ptr_x32(substream, argp); case SNDRV_PCM_IOCTL_CHANNEL_INFO_X32: return snd_pcm_ioctl_channel_info_x32(substream, argp); #endif /* CONFIG_X86_X32 */ diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index 42cc1b71d1e3..47dcf6d4a680 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -148,7 +148,8 @@ void __snd_pcm_xrun(struct snd_pcm_substream *substream) struct timespec64 tstamp;
snd_pcm_gettime(runtime, &tstamp); - runtime->status->tstamp = timespec64_to_timespec(tstamp); + runtime->status->tstamp.tv_sec = tstamp.tv_sec; + runtime->status->tstamp.tv_nsec = tstamp.tv_nsec; } snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { @@ -238,9 +239,10 @@ static void update_audio_tstamp(struct snd_pcm_substream *substream,
if (runtime->status->audio_tstamp.tv_sec != audio_tstamp->tv_sec || runtime->status->audio_tstamp.tv_nsec != audio_tstamp->tv_nsec) { - runtime->status->audio_tstamp = - timespec64_to_timespec(*audio_tstamp); - runtime->status->tstamp = timespec64_to_timespec(*curr_tstamp); + runtime->status->audio_tstamp.tv_sec = audio_tstamp->tv_sec; + runtime->status->audio_tstamp.tv_nsec = audio_tstamp->tv_nsec; + runtime->status->tstamp.tv_sec = curr_tstamp->tv_sec; + runtime->status->tstamp.tv_nsec = curr_tstamp->tv_nsec; }
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index cad90d9ce9da..2be602c44a47 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -2847,14 +2847,15 @@ static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, return 0; }
-#ifdef CONFIG_COMPAT struct snd_pcm_mmap_status32 { s32 state; s32 pad1; u32 hw_ptr; - struct compat_timespec tstamp; + s32 tstamp_sec; + s32 tstamp_nsec; s32 suspended_state; - struct compat_timespec audio_tstamp; + s32 audio_tstamp_sec; + s32 audio_tstamp_nsec; } __attribute__((packed));
struct snd_pcm_mmap_control32 { @@ -2934,18 +2935,18 @@ static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream, snd_pcm_stream_unlock_irq(substream); if (put_user(sstatus.state, &src->s.status.state) || put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) || - compat_put_timespec(&sstatus.tstamp, &src->s.status.tstamp) || + put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) || + put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) || put_user(sstatus.suspended_state, &src->s.status.suspended_state) || - compat_put_timespec(&sstatus.audio_tstamp, - &src->s.status.audio_tstamp) || + put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) || + put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) || put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) || put_user(scontrol.avail_min, &src->c.control.avail_min)) return -EFAULT;
return 0; } -#define __SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32), -#endif +#define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) { @@ -3115,7 +3116,9 @@ static int snd_pcm_common_ioctl(struct file *file, return -EFAULT; return 0; } - case SNDRV_PCM_IOCTL_SYNC_PTR: + case __SNDRV_PCM_IOCTL_SYNC_PTR32: + return snd_pcm_ioctl_sync_ptr_compat(substream, arg); + case __SNDRV_PCM_IOCTL_SYNC_PTR64: return snd_pcm_sync_ptr(substream, arg); #ifdef CONFIG_SND_SUPPORT_OLD_API case SNDRV_PCM_IOCTL_HW_REFINE_OLD: @@ -3453,8 +3456,6 @@ static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file
static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) { - if (pcm_file->no_compat_mmap) - return false; /* See pcm_control_mmap_allowed() below. * Since older alsa-lib requires both status and control mmaps to be * coupled, we have to disable the status mmap for old alsa-lib, too. @@ -3667,11 +3668,19 @@ static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
offset = area->vm_pgoff << PAGE_SHIFT; switch (offset) { - case SNDRV_PCM_MMAP_OFFSET_STATUS: + case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD: + if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) + return -ENXIO; + /* fallthrough */ + case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: if (!pcm_status_mmap_allowed(pcm_file)) return -ENXIO; return snd_pcm_mmap_status(substream, file, area); - case SNDRV_PCM_MMAP_OFFSET_CONTROL: + case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD: + if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT)) + return -ENXIO; + /* fallthrough */ + case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: if (!pcm_control_mmap_allowed(pcm_file)) return -ENXIO; return snd_pcm_mmap_control(substream, file, area); @@ -3831,9 +3840,9 @@ static unsigned long snd_pcm_get_unmapped_area(struct file *file, unsigned long offset = pgoff << PAGE_SHIFT;
switch (offset) { - case SNDRV_PCM_MMAP_OFFSET_STATUS: + case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW: return (unsigned long)runtime->status; - case SNDRV_PCM_MMAP_OFFSET_CONTROL: + case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW: return (unsigned long)runtime->control; default: return (unsigned long)runtime->dma_area + offset;
On Tue, Nov 12, 2019 at 4:18 PM Arnd Bergmann arnd@arndb.de wrote:
Co-developed-with: Baolin Wang baolin.wang@linaro.org Signed-off-by: Baolin Wang baolin.wang@linaro.org Signed-off-by: Arnd Bergmann arnd@arndb.de
include/uapi/sound/asound.h | 106 ++++++++++++++++++++++++++++++++---- sound/core/pcm_compat.c | 30 +++++----- sound/core/pcm_lib.c | 10 ++-- sound/core/pcm_native.c | 39 ++++++++----- 4 files changed, 143 insertions(+), 42 deletions(-)
I found one more use of 'struct timespec' remaining in there, and have amended this patch with a small change now to hide that as well.
Arnd
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index c5d8e7f134d0..e6a958b8aff1 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -502,7 +502,11 @@ struct snd_pcm_status { #define __snd_pcm_mmap_status64 snd_pcm_mmap_status #define __snd_pcm_mmap_control64 snd_pcm_mmap_control #define __snd_pcm_sync_ptr64 snd_pcm_sync_ptr +#ifdef __KERNEL__ +#define __snd_timespec64 __kernel_timespec +#else #define __snd_timespec64 timespec +#endif struct __snd_timespec { __s32 tv_sec; __s32 tv_nsec;
On Tue, 12 Nov 2019 16:16:34 +0100, Arnd Bergmann wrote:
This is a series I worked on with Baolin in 2017 and 2018, but we never quite managed to finish up the last pieces. During the ALSA developer meetup at ELC-E 2018 in Edinburgh, a decision was made to go with this approach for keeping best compatibility with existing source code, and then I failed to follow up by resending the patches.
Now I have patches for all remaining time_t uses in the kernel, so it's absolutely time to revisit them. I have done more review of the patches myself and found a couple of minor issues that I have fixed up, otherwise the series is still the same as before.
Conceptually, the idea of these patches is:
64-bit applications should see no changes at all, neither compile-time nor run-time.
32-bit code compiled with a 64-bit time_t currently does not work with ALSA, and requires kernel changes and/or sound/asound.h changes
Most 32-bit code using these interfaces will work correctly on a modified kernel, with or without the uapi header changes.
32-bit code using SNDRV_TIMER_IOCTL_TREAD requires the updated header file for 64-bit time_t support
32-bit i386 user space with 64-bit time_t is broken for SNDRV_PCM_IOCTL_STATUS, SNDRV_RAWMIDI_IOCTL_STATUS and SNDRV_PCM_IOCTL_SYNC_PTR because of i386 alignment. This is also addressed by the updated uapi header.
PCM mmap is currently supported on native x86 kernels (both 32-bit and 64-bit) but not for compat mode. This series breaks the 32-bit native mmap support for 32-bit time_t, but instead allows it for 64-bit time_t on both native and compat kernels. This seems to be the best trade-off, as mmap support is optional already, and most 32-bit code runs in compat mode anyway.
I've tried to avoid breaking compilation of 32-bit code as much as possible. Anything that does break however is likely code that is already broken on 64-bit time_t and needs source changes to fix them.
I would like to propose merging this into the alsa tree after the v5.5 merge window for inclusion into v5.6, to allow a good amount of testing, in particular for the header changes that may cause problems for user space applications.
Agreed, it's still no urgent problem.
A git branch with the same contents is available for testing at [1].
Please review and test!
Arnd
So now taking a quick look through the series, I find this approach is the way to go. Although one might get a bit more optimization after squeeze, it's already a good compromise between the readability and the efficiency.
A slight uncertain implementation is the timer tread stuff, especially the conditional definition of SNDRV_TIMER_IOCTL_TREAD (IIRC, I already complained it in the past, too). But I have no other idea as well, so unless someone else gives a better option, we can live with that.
Thanks!
Takashi
[1] https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git y2038-alsa [2] https://lore.kernel.org/lkml/CAK8P3a2Os66+iwQYf97qh05W2JP8rmWao8zmKoHiXqVHvy...
Changes since v5 (Arnd):
- Rebased to linux-5.4-rc4
- Updated to completely remove timespec and time_t references from alsa
- found and fixed a few bugs
Changes since v4 (Baolin):
- Add patch 5 to change trigger_tstamp member of struct snd_pcm_runtime.
- Add patch 8 to change internal timespec.
- Add more explanation in commit message.
- Use ktime_get_real_ts64() in patch 6.
- Split common code out into a separate function in patch 6.
- Fix tu->tread bug in patch 6 and remove #if __BITS_PER_LONG == 64 macro.
Changes since v3:
- Move struct snd_pcm_status32 to pcm.h file.
- Modify comments and commit message.
- Add new patch2 ~ patch6.
Changes since v2:
- Renamed all structures to make clear.
- Remove CONFIG_X86_X32 macro and introduced new compat_snd_pcm_status64_x86_32.
Changes since v1:
- Add one macro for struct snd_pcm_status_32 which only active in 32bits kernel.
- Convert pcm_compat.c to use struct snd_pcm_status_64.
- Convert pcm_native.c to use struct snd_pcm_status_64.
Arnd Bergmann (2): ALSA: move snd_pcm_ioctl_sync_ptr_compat into pcm_native.c ALSA: add new 32-bit layout for snd_pcm_mmap_status/control
Baolin Wang (6): ALSA: Replace timespec with timespec64 ALSA: Avoid using timespec for struct snd_timer_status ALSA: Avoid using timespec for struct snd_ctl_elem_value ALSA: Avoid using timespec for struct snd_pcm_status ALSA: Avoid using timespec for struct snd_rawmidi_status ALSA: Avoid using timespec for struct snd_timer_tread
include/sound/pcm.h | 74 ++++++-- include/sound/timer.h | 4 +- include/uapi/sound/asound.h | 132 ++++++++++++-- sound/core/pcm.c | 12 +- sound/core/pcm_compat.c | 282 ++++++++---------------------- sound/core/pcm_lib.c | 38 ++-- sound/core/pcm_native.c | 226 +++++++++++++++++++++--- sound/core/rawmidi.c | 132 +++++++++++--- sound/core/rawmidi_compat.c | 87 +++------ sound/core/timer.c | 229 ++++++++++++++++++------ sound/core/timer_compat.c | 62 +------ sound/pci/hda/hda_controller.c | 10 +- sound/soc/intel/skylake/skl-pcm.c | 4 +- 13 files changed, 804 insertions(+), 488 deletions(-)
-- 2.20.0
On Tue, Nov 12, 2019 at 9:37 PM Takashi Iwai tiwai@suse.de wrote:
On Tue, 12 Nov 2019 16:16:34 +0100, Arnd Bergmann wrote:
I would like to propose merging this into the alsa tree after the v5.5 merge window for inclusion into v5.6, to allow a good amount of testing, in particular for the header changes that may cause problems for user space applications.
Agreed, it's still no urgent problem.
I actually do think it's getting urgent, anything that touches the ABI must be done carefully and not rushed.
The urgency at the moment is that developers are starting to deploy systems with 64-bit time_t with musl-libc making this the default now, and 32-bit risc-v not offering 32-bit time_t at all.
At the moment, this means that audio support is broken for them, and that needs to be fixed.
The other reason why lots of people care about moving all user space to 64-bit time_t is that 32-bit hardware is slowly starting to become less common. We know there will still be many 32-bit ARM systems operational in 2038, but most of them will be on (then) 10+ year old hardware, running even older software that already being worked on today. The longer it takes us to stop using 32-bit time_t in user space, the more systems will end up having to be thrown away rather than fixed.
So now taking a quick look through the series, I find this approach is the way to go. Although one might get a bit more optimization after squeeze, it's already a good compromise between the readability and the efficiency.
Thanks!
A slight uncertain implementation is the timer tread stuff, especially the conditional definition of SNDRV_TIMER_IOCTL_TREAD (IIRC, I already complained it in the past, too). But I have no other idea as well, so unless someone else gives a better option, we can live with that.
We had discussed alternatives for this one last time, and decided to go with the solution I posted here. The main alternative would be to change the 'timespec' in snd_timer_tread to a fixed-length structure based on two 'long' members. This would avoid the need to match the command with the time_t type, but the cost would be requiring CLOCK_MONOTONIC timestamps to avoid the overflow, and changing all application source code that requires the type to be compatible with 'timespec'.
Arnd
On Wed, 13 Nov 2019 15:32:44 +0100, Arnd Bergmann wrote:
On Tue, Nov 12, 2019 at 9:37 PM Takashi Iwai tiwai@suse.de wrote:
On Tue, 12 Nov 2019 16:16:34 +0100, Arnd Bergmann wrote:
I would like to propose merging this into the alsa tree after the v5.5 merge window for inclusion into v5.6, to allow a good amount of testing, in particular for the header changes that may cause problems for user space applications.
Agreed, it's still no urgent problem.
I actually do think it's getting urgent, anything that touches the ABI must be done carefully and not rushed.
The urgency at the moment is that developers are starting to deploy systems with 64-bit time_t with musl-libc making this the default now, and 32-bit risc-v not offering 32-bit time_t at all.
At the moment, this means that audio support is broken for them, and that needs to be fixed.
The other reason why lots of people care about moving all user space to 64-bit time_t is that 32-bit hardware is slowly starting to become less common. We know there will still be many 32-bit ARM systems operational in 2038, but most of them will be on (then) 10+ year old hardware, running even older software that already being worked on today. The longer it takes us to stop using 32-bit time_t in user space, the more systems will end up having to be thrown away rather than fixed.
Don't worry, I planned merging the whole changes for 5.6.
So now taking a quick look through the series, I find this approach is the way to go. Although one might get a bit more optimization after squeeze, it's already a good compromise between the readability and the efficiency.
Thanks!
A slight uncertain implementation is the timer tread stuff, especially the conditional definition of SNDRV_TIMER_IOCTL_TREAD (IIRC, I already complained it in the past, too). But I have no other idea as well, so unless someone else gives a better option, we can live with that.
We had discussed alternatives for this one last time, and decided to go with the solution I posted here. The main alternative would be to change the 'timespec' in snd_timer_tread to a fixed-length structure based on two 'long' members. This would avoid the need to match the command with the time_t type, but the cost would be requiring CLOCK_MONOTONIC timestamps to avoid the overflow, and changing all application source code that requires the type to be compatible with 'timespec'.
Fair enough.
One thing I forgot to mention: when we add/modify the ioctl or ABI, we need to increment the protocol version, e.g. SNDRV_PCM_VERSION to indicate user-space the supported ABI. Please change these in your next patches, too.
thanks,
Takashi
On Wed, Nov 13, 2019 at 5:40 PM Takashi Iwai tiwai@suse.de wrote:
On Wed, 13 Nov 2019 15:32:44 +0100, Arnd Bergmann wrote:
We had discussed alternatives for this one last time, and decided to go with the solution I posted here. The main alternative would be to change the 'timespec' in snd_timer_tread to a fixed-length structure based on two 'long' members. This would avoid the need to match the command with the time_t type, but the cost would be requiring CLOCK_MONOTONIC timestamps to avoid the overflow, and changing all application source code that requires the type to be compatible with 'timespec'.
Fair enough.
One thing I forgot to mention: when we add/modify the ioctl or ABI, we need to increment the protocol version, e.g. SNDRV_PCM_VERSION to indicate user-space the supported ABI. Please change these in your next patches, too.
Just to confirm: this should be a simple one-line patch at the end of the series like
diff --git a/tools/include/uapi/sound/asound.h b/tools/include/uapi/sound/asound.h index df1153cea0b7..72e8380c6dcd 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -154,7 +154,7 @@ struct snd_hwdep_dsp_image { * * *****************************************************************************/
-#define SNDRV_PCM_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 14) +#define SNDRV_PCM_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 15)
typedef unsigned long snd_pcm_uframes_t; typedef signed long snd_pcm_sframes_t;
right? Most other kernel interfaces have no version numbering, so I don't know what policy you have here.
Arnd
On Wed, 13 Nov 2019 17:51:57 +0100, Arnd Bergmann wrote:
On Wed, Nov 13, 2019 at 5:40 PM Takashi Iwai tiwai@suse.de wrote:
On Wed, 13 Nov 2019 15:32:44 +0100, Arnd Bergmann wrote:
We had discussed alternatives for this one last time, and decided to go with the solution I posted here. The main alternative would be to change the 'timespec' in snd_timer_tread to a fixed-length structure based on two 'long' members. This would avoid the need to match the command with the time_t type, but the cost would be requiring CLOCK_MONOTONIC timestamps to avoid the overflow, and changing all application source code that requires the type to be compatible with 'timespec'.
Fair enough.
One thing I forgot to mention: when we add/modify the ioctl or ABI, we need to increment the protocol version, e.g. SNDRV_PCM_VERSION to indicate user-space the supported ABI. Please change these in your next patches, too.
Just to confirm: this should be a simple one-line patch at the end of the series like
diff --git a/tools/include/uapi/sound/asound.h b/tools/include/uapi/sound/asound.h index df1153cea0b7..72e8380c6dcd 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -154,7 +154,7 @@ struct snd_hwdep_dsp_image {
*
*****************************************************************************/
-#define SNDRV_PCM_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 14) +#define SNDRV_PCM_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 15)
typedef unsigned long snd_pcm_uframes_t; typedef signed long snd_pcm_sframes_t;
right? Most other kernel interfaces have no version numbering, so I don't know what policy you have here.
I don't mind much about that, so it's up to you -- we can fold this change into the patch that actually adds or modifies the ioctl, too.
thanks,
Takashi
On Wed, Nov 13, 2019 at 6:04 PM Takashi Iwai tiwai@suse.de wrote:
On Wed, 13 Nov 2019 17:51:57 +0100, Arnd Bergmann wrote:
On Wed, Nov 13, 2019 at 5:40 PM Takashi Iwai tiwai@suse.de wrote:
On Wed, 13 Nov 2019 15:32:44 +0100, Arnd Bergmann wrote:
We had discussed alternatives for this one last time, and decided to go with the solution I posted here. The main alternative would be to change the 'timespec' in snd_timer_tread to a fixed-length structure based on two 'long' members. This would avoid the need to match the command with the time_t type, but the cost would be requiring CLOCK_MONOTONIC timestamps to avoid the overflow, and changing all application source code that requires the type to be compatible with 'timespec'.
Fair enough.
One thing I forgot to mention: when we add/modify the ioctl or ABI, we need to increment the protocol version, e.g. SNDRV_PCM_VERSION to indicate user-space the supported ABI. Please change these in your next patches, too.
Just to confirm: this should be a simple one-line patch at the end of the series like
diff --git a/tools/include/uapi/sound/asound.h b/tools/include/uapi/sound/asound.h index df1153cea0b7..72e8380c6dcd 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -154,7 +154,7 @@ struct snd_hwdep_dsp_image {
*
*****************************************************************************/
-#define SNDRV_PCM_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 14) +#define SNDRV_PCM_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 15)
typedef unsigned long snd_pcm_uframes_t; typedef signed long snd_pcm_sframes_t;
right? Most other kernel interfaces have no version numbering, so I don't know what policy you have here.
I don't mind much about that, so it's up to you -- we can fold this change into the patch that actually adds or modifies the ioctl, too.
I've added the patch below to the end of the series now, will repost the series after no more comments come in for this version. Having a single patch to update the version seems better than updating it multiple times with each patch touching the ABI in this series.
Arnd
commit b83a3eaece9b445f897a6f5ac2a903f2566a0e9d Author: Arnd Bergmann arnd@arndb.de Date: Wed Nov 13 17:49:14 2019 +0100
ALSA: bump uapi version number
Change SNDRV_PCM_VERSION to indicate the addition of the time64 version of the mmap interface and these ioctl commands:
SNDRV_PCM_IOCTL_SYNC SNDRV_RAWMIDI_IOCTL_STATUS SNDRV_PCM_IOCTL_STATUS SNDRV_PCM_IOCTL_STATUS_EXT SNDRV_TIMER_IOCTL_TREAD SNDRV_TIMER_IOCTL_STATUS
32-bit applications built with 64-bit time_t require both the headers and the running kernel to support at least API version 2.0.15. When built with earlier kernel headers, some of these may not work correctly, so applications are encouraged to fail compilation like
#if SNDRV_PCM_VERSION < SNDRV_PROTOCOL_VERSION(2, 0, 15) extern int __fail_build_for_time_64[sizeof(long) - sizeof(time_t)]; #endif
or provide their own updated copy of the header file.
Signed-off-by: Arnd Bergmann arnd@arndb.de
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 25dbf71fa667..5cddfe62c97a 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -156,7 +156,7 @@ struct snd_hwdep_dsp_image { * * *****************************************************************************/
-#define SNDRV_PCM_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 14) +#define SNDRV_PCM_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 15)
typedef unsigned long snd_pcm_uframes_t; typedef signed long snd_pcm_sframes_t;
On Wed, 13 Nov 2019 18:19:56 +0100, Arnd Bergmann wrote:
On Wed, Nov 13, 2019 at 6:04 PM Takashi Iwai tiwai@suse.de wrote:
On Wed, 13 Nov 2019 17:51:57 +0100, Arnd Bergmann wrote:
On Wed, Nov 13, 2019 at 5:40 PM Takashi Iwai tiwai@suse.de wrote:
On Wed, 13 Nov 2019 15:32:44 +0100, Arnd Bergmann wrote:
We had discussed alternatives for this one last time, and decided to go with the solution I posted here. The main alternative would be to change the 'timespec' in snd_timer_tread to a fixed-length structure based on two 'long' members. This would avoid the need to match the command with the time_t type, but the cost would be requiring CLOCK_MONOTONIC timestamps to avoid the overflow, and changing all application source code that requires the type to be compatible with 'timespec'.
Fair enough.
One thing I forgot to mention: when we add/modify the ioctl or ABI, we need to increment the protocol version, e.g. SNDRV_PCM_VERSION to indicate user-space the supported ABI. Please change these in your next patches, too.
Just to confirm: this should be a simple one-line patch at the end of the series like
diff --git a/tools/include/uapi/sound/asound.h b/tools/include/uapi/sound/asound.h index df1153cea0b7..72e8380c6dcd 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -154,7 +154,7 @@ struct snd_hwdep_dsp_image {
*
*****************************************************************************/
-#define SNDRV_PCM_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 14) +#define SNDRV_PCM_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 15)
typedef unsigned long snd_pcm_uframes_t; typedef signed long snd_pcm_sframes_t;
right? Most other kernel interfaces have no version numbering, so I don't know what policy you have here.
I don't mind much about that, so it's up to you -- we can fold this change into the patch that actually adds or modifies the ioctl, too.
I've added the patch below to the end of the series now, will repost the series after no more comments come in for this version. Having a single patch to update the version seems better than updating it multiple times with each patch touching the ABI in this series.
Arnd
commit b83a3eaece9b445f897a6f5ac2a903f2566a0e9d Author: Arnd Bergmann arnd@arndb.de Date: Wed Nov 13 17:49:14 2019 +0100
ALSA: bump uapi version number Change SNDRV_PCM_VERSION to indicate the addition of the time64 version of the mmap interface and these ioctl commands: SNDRV_PCM_IOCTL_SYNC SNDRV_RAWMIDI_IOCTL_STATUS SNDRV_PCM_IOCTL_STATUS SNDRV_PCM_IOCTL_STATUS_EXT SNDRV_TIMER_IOCTL_TREAD SNDRV_TIMER_IOCTL_STATUS 32-bit applications built with 64-bit time_t require both the headers and the running kernel to support at least API version 2.0.15. When built with earlier kernel headers, some of these may not work correctly, so applications are encouraged to fail compilation like #if SNDRV_PCM_VERSION < SNDRV_PROTOCOL_VERSION(2, 0, 15) extern int __fail_build_for_time_64[sizeof(long) - sizeof(time_t)]; #endif or provide their own updated copy of the header file. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 25dbf71fa667..5cddfe62c97a 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -156,7 +156,7 @@ struct snd_hwdep_dsp_image {
*
*****************************************************************************/
-#define SNDRV_PCM_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 14) +#define SNDRV_PCM_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 15)
typedef unsigned long snd_pcm_uframes_t; typedef signed long snd_pcm_sframes_t;
I wasn't clear enough. Each ALSA device API has a protocol version, not only PCM, so we need updating SNDRV_RAWMIDI_VERSION and SNDRV_TIMER_VERSION as well.
thanks,
Takashi
On Wed, Nov 13, 2019 at 7:13 PM Takashi Iwai tiwai@suse.de wrote:
On Wed, 13 Nov 2019 18:19:56 +0100, Arnd Bergmann wrote:
On Wed, Nov 13, 2019 at 6:04 PM Takashi Iwai tiwai@suse.de wrote:
I don't mind much about that, so it's up to you -- we can fold this change into the patch that actually adds or modifies the ioctl, too.
I've added the patch below to the end of the series now, will repost the series after no more comments come in for this version. Having a single patch to update the version seems better than updating it multiple times with each patch touching the ABI in this series.
I wasn't clear enough. Each ALSA device API has a protocol version, not only PCM, so we need updating SNDRV_RAWMIDI_VERSION and SNDRV_TIMER_VERSION as well.
Ok, I see. I've updated the patch to include all three, and adapted the changelog text. There are still multiple changes for the PCM interface, so this avoids having the version number change attached to half the code changes.
Arnd
participants (2)
-
Arnd Bergmann
-
Takashi Iwai