use hashtable instead of linear list to check kcontrol before adding them for improving early audio KPI. With this changes we see 600ms improvement in start of audio

Change-Id: I1a95d88ef41b48430b57307a0e6a8e82788b4372 Signed-off-by: Raghu Bankapur quic_rbankapu@quicinc.com --- include/sound/control.h | 2 + include/sound/core.h | 5 +- sound/core/control.c | 106 +++++++++++++++++++++++----------------- sound/core/init.c | 1 + 4 files changed, 68 insertions(+), 46 deletions(-)

diff --git a/include/sound/control.h b/include/sound/control.h index 985c51a8fb74..e50db5c45114 100644 --- a/include/sound/control.h +++ b/include/sound/control.h @@ -70,6 +70,8 @@ struct snd_kcontrol_volatile { struct snd_kcontrol { struct list_head list; /* list of controls */ struct snd_ctl_elem_id id; + struct hlist_node hnode; + unsigned int knametoint; /* kctl name to uint, hash key value */ unsigned int count; /* count of same elements */ snd_kcontrol_info_t *info; snd_kcontrol_get_t *get; diff --git a/include/sound/core.h b/include/sound/core.h index b7e9b58d3c78..90341d6f1573 100644 --- a/include/sound/core.h +++ b/include/sound/core.h @@ -14,6 +14,7 @@ #include <linux/pm.h> /* pm_message_t */ #include <linux/stringify.h> #include <linux/printk.h> +#include <linux/hashtable.h>

/* number of supported soundcards */ #ifdef CONFIG_SND_DYNAMIC_MINORS @@ -24,6 +25,8 @@

#define CONFIG_SND_MAJOR 116 /* standard configuration */

+#define SND_CTL_HASH_TABLE_BITS 14 /* buckets numbers: 1 << 14 */ + /* forward declarations */ struct pci_dev; struct module; @@ -103,7 +106,7 @@ struct snd_card { size_t user_ctl_alloc_size; // current memory allocation by user controls. struct list_head controls; /* all controls for this card */ struct list_head ctl_files; /* active control files */ - + DECLARE_HASHTABLE(ctl_htable, SND_CTL_HASH_TABLE_BITS); struct snd_info_entry *proc_root; /* root for soundcard specific files */ struct proc_dir_entry *proc_root_link; /* number link to real id */

diff --git a/sound/core/control.c b/sound/core/control.c index a25c0d64d104..e00a02015837 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -331,43 +331,49 @@ void snd_ctl_free_one(struct snd_kcontrol *kcontrol) } EXPORT_SYMBOL(snd_ctl_free_one);

-static bool snd_ctl_remove_numid_conflict(struct snd_card *card, - unsigned int count) +enum snd_ctl_add_mode { + CTL_ADD_EXCLUSIVE, CTL_REPLACE, CTL_ADD_ON_REPLACE, +}; + +char snd_ctl_string[50] = { '\0' }; + +/* Used to convert the string into int value -- BKDRHash */ +static unsigned int snd_ctl_strtoint(const char *s) { - struct snd_kcontrol *kctl; + unsigned int res = 0;

- /* Make sure that the ids assigned to the control do not wrap around */ - if (card->last_numid >= UINT_MAX - count) - card->last_numid = 0; + while (*s) + res = (res << 5) - res + (*s++);

- list_for_each_entry(kctl, &card->controls, list) { - if (kctl->id.numid < card->last_numid + 1 + count && - kctl->id.numid + kctl->count > card->last_numid + 1) { - card->last_numid = kctl->id.numid + kctl->count - 1; - return true; - } - } - return false; + return (res & 0x7FFFFFFF); }

-static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) +/** + * snd_ctl_hash_check - Check the duplicate enrty on snd hashtable + * @card: the card instance + * @nametoint: kctl name to uint + * + * Finds the control instance with the given nametoint from the card. + * + * Return: The pointer of the instance if found, or %NULL if not. + * + */ +static struct snd_kcontrol *snd_ctl_hash_check(struct snd_card *card, + unsigned int nametoint) { - unsigned int iter = 100000; + struct snd_kcontrol *kctl = NULL;

- while (snd_ctl_remove_numid_conflict(card, count)) { - if (--iter == 0) { - /* this situation is very unlikely */ - dev_err(card->dev, "unable to allocate new control numid\n"); - return -ENOMEM; - } + if (snd_BUG_ON(!card)) + return NULL; + + hash_for_each_possible(card->ctl_htable, kctl, hnode, nametoint) { + if (kctl->knametoint != nametoint) + continue; + return kctl; } - return 0; + return NULL; }

-enum snd_ctl_add_mode { - CTL_ADD_EXCLUSIVE, CTL_REPLACE, CTL_ADD_ON_REPLACE, -}; - /* add/replace a new kcontrol object; call with card->controls_rwsem locked */ static int __snd_ctl_add_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, @@ -382,26 +388,34 @@ static int __snd_ctl_add_replace(struct snd_card *card, if (id.index > UINT_MAX - kcontrol->count) return -EINVAL;

- old = snd_ctl_find_id(card, &id); - if (!old) { - if (mode == CTL_REPLACE) - return -EINVAL; - } else { - if (mode == CTL_ADD_EXCLUSIVE) { - dev_err(card->dev, - "control %i:%i:%i:%s:%i is already present\n", - id.iface, id.device, id.subdevice, id.name, - id.index); - return -EBUSY; - } + snprintf(snd_ctl_string, strlen(kcontrol->id.name) + 6, "%s%d%d%d", + kcontrol->id.name, kcontrol->id.iface, kcontrol->id.device, + kcontrol->id.subdevice);

- err = snd_ctl_remove(card, old); - if (err < 0) - return err; - } + kcontrol->knametoint = snd_ctl_strtoint(snd_ctl_string); + if (kcontrol->knametoint < 0) + return -EINVAL;

- if (snd_ctl_find_hole(card, kcontrol->count) < 0) - return -ENOMEM; + old = snd_ctl_hash_check(card, kcontrol->knametoint); + if (old) { + old = snd_ctl_find_id(card, &id); + if (!old) { + if (mode == CTL_REPLACE) + return -EINVAL; + } else { + if (mode == CTL_ADD_EXCLUSIVE) { + dev_err(card->dev, + "control %i:%i:%i:%s:%i is already present\n", + id.iface, id.device, id.subdevice, id.name, + id.index); + return -EBUSY; + } + + err = snd_ctl_remove(card, old); + if (err < 0) + return err; + } + }

list_add_tail(&kcontrol->list, &card->controls); card->controls_count += kcontrol->count; @@ -411,6 +425,8 @@ static int __snd_ctl_add_replace(struct snd_card *card, for (idx = 0; idx < kcontrol->count; idx++) snd_ctl_notify_one(card, SNDRV_CTL_EVENT_MASK_ADD, kcontrol, idx);

+ hash_add(card->ctl_htable, &kcontrol->hnode, kcontrol->knametoint); + return 0; }

diff --git a/sound/core/init.c b/sound/core/init.c index 31ba7024e3ad..24138902e5f2 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -284,6 +284,7 @@ static int snd_card_init(struct snd_card *card, struct device *parent, INIT_LIST_HEAD(&card->ctl_files); spin_lock_init(&card->files_lock); INIT_LIST_HEAD(&card->files_list); + hash_init(card->ctl_htable); mutex_init(&card->memory_mutex); #ifdef CONFIG_PM init_waitqueue_head(&card->power_sleep);