Manage the connection list cache using linked lists instead of snd_array, and revive snd_hda_get_conn_list() again, so that we don't have to keep the expanded values locally. This will reduce the stack usage by recursive call of snd_hda_get_conn_index() or parse_nid_path() of the generic parser.
The list management doesn't include any mutex protection, thus the caller needs to take care of race appropriately.
Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/pci/hda/hda_codec.c | 164 ++++++++++++++++++++++++++------------------ sound/pci/hda/hda_codec.h | 4 +- sound/pci/hda/hda_generic.c | 8 +-- 3 files changed, 106 insertions(+), 70 deletions(-)
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c index 380c9ed..cd318e4 100644 --- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -334,20 +334,51 @@ int snd_hda_get_sub_nodes(struct hda_codec *codec, hda_nid_t nid, } EXPORT_SYMBOL_HDA(snd_hda_get_sub_nodes);
+/* connection list element */ +struct hda_conn_list { + struct list_head list; + int len; + hda_nid_t nid; + hda_nid_t conns[0]; +}; + /* look up the cached results */ -static hda_nid_t *lookup_conn_list(struct snd_array *array, hda_nid_t nid) +static struct hda_conn_list * +lookup_conn_list(struct hda_codec *codec, hda_nid_t nid) { - int i, len; - for (i = 0; i < array->used; ) { - hda_nid_t *p = snd_array_elem(array, i); - if (nid == *p) + struct hda_conn_list *p; + list_for_each_entry(p, &codec->conn_list, list) { + if (p->nid == nid) return p; - len = p[1]; - i += len + 2; } return NULL; }
+static int add_conn_list(struct hda_codec *codec, hda_nid_t nid, int len, + const hda_nid_t *list) +{ + struct hda_conn_list *p; + + p = kmalloc(sizeof(*p) + len * sizeof(hda_nid_t), GFP_KERNEL); + if (!p) + return -ENOMEM; + p->len = len; + p->nid = nid; + memcpy(p->conns, list, len * sizeof(hda_nid_t)); + list_add(&p->list, &codec->conn_list); + return 0; +} + +static void remove_conn_list(struct hda_codec *codec) +{ + while (!list_empty(&codec->conn_list)) { + struct hda_conn_list *p; + p = list_first_entry(&codec->conn_list, typeof(*p), list); + list_del(&p->list); + kfree(p); + } +} + /* read the connection and add to the cache */ static int read_and_add_raw_conns(struct hda_codec *codec, hda_nid_t nid) { @@ -361,6 +392,49 @@ static int read_and_add_raw_conns(struct hda_codec *codec, hda_nid_t nid) }
/** + * snd_hda_get_conn_list - get connection list + * @codec: the HDA codec + * @nid: NID to parse + * @len: number of connection list entries + * @listp: the pointer to store NID list + * + * Parses the connection list of the given widget and stores the pointer + * to the list of NIDs. + * + * Returns the number of connections, or a negative error code. + * + * Note that the returned pointer isn't protected against the list + * modification. If snd_hda_override_conn_list() might be called + * concurrently, protect with a mutex appropriately. + */ +int snd_hda_get_conn_list(struct hda_codec *codec, hda_nid_t nid, + const hda_nid_t **listp) +{ + bool added = false; + + for (;;) { + int err; + const struct hda_conn_list *p; + + /* if the connection-list is already cached, read it */ + p = lookup_conn_list(codec, nid); + if (p) { + if (listp) + *listp = p->conns; + return p->len; + } + if (snd_BUG_ON(added)) + return -EINVAL; + + err = read_and_add_raw_conns(codec, nid); + if (err < 0) + return err; + added = true; + } +} +EXPORT_SYMBOL_HDA(snd_hda_get_conn_list); + +/** * snd_hda_get_connections - copy connection list * @codec: the HDA codec * @nid: NID to parse @@ -375,39 +449,20 @@ static int read_and_add_raw_conns(struct hda_codec *codec, hda_nid_t nid) int snd_hda_get_connections(struct hda_codec *codec, hda_nid_t nid, hda_nid_t *conn_list, int max_conns) { - struct snd_array *array = &codec->conn_lists; - int len; - hda_nid_t *p; - bool added = false; + const hda_nid_t *list; + int len = snd_hda_get_conn_list(codec, nid, &list);
- again: - mutex_lock(&codec->hash_mutex); - len = -1; - /* if the connection-list is already cached, read it */ - p = lookup_conn_list(array, nid); - if (p) { - len = p[1]; - if (conn_list && len > max_conns) { + if (len > 0 && conn_list) { + if (len > max_conns) { snd_printk(KERN_ERR "hda_codec: " "Too many connections %d for NID 0x%x\n", len, nid); - mutex_unlock(&codec->hash_mutex); return -EINVAL; } - if (conn_list && len) - memcpy(conn_list, p + 2, len * sizeof(hda_nid_t)); + memcpy(conn_list, list, len * sizeof(hda_nid_t)); } - mutex_unlock(&codec->hash_mutex); - if (len >= 0) - return len; - if (snd_BUG_ON(added)) - return -EINVAL;
- len = read_and_add_raw_conns(codec, nid); - if (len < 0) - return len; - added = true; - goto again; + return len; } EXPORT_SYMBOL_HDA(snd_hda_get_connections);
@@ -519,15 +574,6 @@ int snd_hda_get_raw_connections(struct hda_codec *codec, hda_nid_t nid, return conns; }
-static bool add_conn_list(struct snd_array *array, hda_nid_t nid) -{ - hda_nid_t *p = snd_array_new(array); - if (!p) - return false; - *p = nid; - return true; -} - /** * snd_hda_override_conn_list - add/modify the connection-list to cache * @codec: the HDA codec @@ -543,28 +589,15 @@ static bool add_conn_list(struct snd_array *array, hda_nid_t nid) int snd_hda_override_conn_list(struct hda_codec *codec, hda_nid_t nid, int len, const hda_nid_t *list) { - struct snd_array *array = &codec->conn_lists; - hda_nid_t *p; - int i, old_used; + struct hda_conn_list *p;
- mutex_lock(&codec->hash_mutex); - p = lookup_conn_list(array, nid); - if (p) - *p = -1; /* invalidate the old entry */ - - old_used = array->used; - if (!add_conn_list(array, nid) || !add_conn_list(array, len)) - goto error_add; - for (i = 0; i < len; i++) - if (!add_conn_list(array, list[i])) - goto error_add; - mutex_unlock(&codec->hash_mutex); - return 0; + p = lookup_conn_list(codec, nid); + if (p) { + list_del(&p->list); + kfree(p); + }
- error_add: - array->used = old_used; - mutex_unlock(&codec->hash_mutex); - return -ENOMEM; + return add_conn_list(codec, nid, len, list); } EXPORT_SYMBOL_HDA(snd_hda_override_conn_list);
@@ -582,10 +615,10 @@ EXPORT_SYMBOL_HDA(snd_hda_override_conn_list); int snd_hda_get_conn_index(struct hda_codec *codec, hda_nid_t mux, hda_nid_t nid, int recursive) { - hda_nid_t conn[HDA_MAX_NUM_INPUTS]; + const hda_nid_t *conn; int i, nums;
- nums = snd_hda_get_connections(codec, mux, conn, ARRAY_SIZE(conn)); + nums = snd_hda_get_conn_list(codec, mux, &conn); for (i = 0; i < nums; i++) if (conn[i] == nid) return i; @@ -1186,8 +1219,8 @@ static void snd_hda_codec_free(struct hda_codec *codec) snd_array_free(&codec->mixers); snd_array_free(&codec->nids); snd_array_free(&codec->cvt_setups); - snd_array_free(&codec->conn_lists); snd_array_free(&codec->spdif_out); + remove_conn_list(codec); codec->bus->caddr_tbl[codec->addr] = NULL; if (codec->patch_ops.free) codec->patch_ops.free(codec); @@ -1257,10 +1290,11 @@ int snd_hda_codec_new(struct hda_bus *bus, snd_array_init(&codec->init_pins, sizeof(struct hda_pincfg), 16); snd_array_init(&codec->driver_pins, sizeof(struct hda_pincfg), 16); snd_array_init(&codec->cvt_setups, sizeof(struct hda_cvt_setup), 8); - snd_array_init(&codec->conn_lists, sizeof(hda_nid_t), 64); snd_array_init(&codec->spdif_out, sizeof(struct hda_spdif_out), 16); snd_array_init(&codec->jacktbl, sizeof(struct hda_jack_tbl), 16); snd_array_init(&codec->verbs, sizeof(struct hda_verb *), 8); + INIT_LIST_HEAD(&codec->conn_list); + INIT_DELAYED_WORK(&codec->jackpoll_work, hda_jackpoll_work);
#ifdef CONFIG_PM diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h index 9f241d1..93ec747 100644 --- a/sound/pci/hda/hda_codec.h +++ b/sound/pci/hda/hda_codec.h @@ -831,7 +831,7 @@ struct hda_codec { struct hda_cache_rec amp_cache; /* cache for amp access */ struct hda_cache_rec cmd_cache; /* cache for other commands */
- struct snd_array conn_lists; /* connection-list array */ + struct list_head conn_list; /* linked-list of connection-list */
struct mutex spdif_mutex; struct mutex control_mutex; @@ -944,6 +944,8 @@ snd_hda_get_num_conns(struct hda_codec *codec, hda_nid_t nid) } int snd_hda_get_raw_connections(struct hda_codec *codec, hda_nid_t nid, hda_nid_t *conn_list, int max_conns); +int snd_hda_get_conn_list(struct hda_codec *codec, hda_nid_t nid, + const hda_nid_t **listp); int snd_hda_override_conn_list(struct hda_codec *codec, hda_nid_t nid, int nums, const hda_nid_t *list); int snd_hda_get_conn_index(struct hda_codec *codec, hda_nid_t mux, diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c index 18daa8f..f69f2ab 100644 --- a/sound/pci/hda/hda_generic.c +++ b/sound/pci/hda/hda_generic.c @@ -208,7 +208,7 @@ static bool __parse_nid_path(struct hda_codec *codec, int with_aa_mix, struct nid_path *path, int depth) { struct hda_gen_spec *spec = codec->spec; - hda_nid_t conn[16]; + const hda_nid_t *conn; int i, nums;
if (to_nid == spec->mixer_nid) { @@ -217,7 +217,7 @@ static bool __parse_nid_path(struct hda_codec *codec, with_aa_mix = HDA_PARSE_ALL; /* mark aa-mix is included */ }
- nums = snd_hda_get_connections(codec, to_nid, conn, ARRAY_SIZE(conn)); + nums = snd_hda_get_conn_list(codec, to_nid, &conn); for (i = 0; i < nums; i++) { if (conn[i] != from_nid) { /* special case: when from_nid is 0, @@ -481,12 +481,12 @@ static void activate_amp_in(struct hda_codec *codec, struct nid_path *path, int i, bool enable, bool add_aamix) { struct hda_gen_spec *spec = codec->spec; - hda_nid_t conn[16]; + const hda_nid_t *conn; int n, nums, idx; int type; hda_nid_t nid = path->path[i];
- nums = snd_hda_get_connections(codec, nid, conn, ARRAY_SIZE(conn)); + nums = snd_hda_get_conn_list(codec, nid, &conn); type = get_wcaps_type(get_wcaps(codec, nid)); if (type == AC_WID_PIN || (type == AC_WID_AUD_IN && codec->single_adc_amp)) {