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Diffstat (limited to 'sound/core/timer.c')
-rw-r--r--sound/core/timer.c393
1 files changed, 316 insertions, 77 deletions
diff --git a/sound/core/timer.c b/sound/core/timer.c
index 4d2ee99c12a3..8072183c33d3 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -13,6 +13,8 @@
#include <linux/module.h>
#include <linux/string.h>
#include <linux/sched/signal.h>
+#include <linux/anon_inodes.h>
+#include <linux/idr.h>
#include <sound/core.h>
#include <sound/timer.h>
#include <sound/control.h>
@@ -109,6 +111,16 @@ struct snd_timer_status64 {
unsigned char reserved[64]; /* reserved */
};
+#ifdef CONFIG_SND_UTIMER
+#define SNDRV_UTIMERS_MAX_COUNT 128
+/* Internal data structure for keeping the state of the userspace-driven timer */
+struct snd_utimer {
+ char *name;
+ struct snd_timer *timer;
+ unsigned int id;
+};
+#endif
+
#define SNDRV_TIMER_IOCTL_STATUS64 _IOR('T', 0x14, struct snd_timer_status64)
/* list of timers */
@@ -544,6 +556,14 @@ static int snd_timer_start1(struct snd_timer_instance *timeri,
SNDRV_TIMER_IFLG_START))
return -EBUSY;
+ /* check the actual time for the start tick;
+ * bail out as error if it's way too low (< 100us)
+ */
+ if (start && !(timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
+ if ((u64)snd_timer_hw_resolution(timer) * ticks < 100000)
+ return -EINVAL;
+ }
+
if (start)
timeri->ticks = timeri->cticks = ticks;
else if (!timeri->cticks)
@@ -1098,8 +1118,8 @@ struct snd_timer_system_private {
static void snd_timer_s_function(struct timer_list *t)
{
- struct snd_timer_system_private *priv = from_timer(priv, t,
- tlist);
+ struct snd_timer_system_private *priv = timer_container_of(priv, t,
+ tlist);
struct snd_timer *timer = priv->snd_timer;
unsigned long jiff = jiffies;
if (time_after(jiff, priv->last_expires))
@@ -1132,7 +1152,7 @@ static int snd_timer_s_stop(struct snd_timer * timer)
unsigned long jiff;
priv = (struct snd_timer_system_private *) timer->private_data;
- del_timer(&priv->tlist);
+ timer_delete(&priv->tlist);
jiff = jiffies;
if (time_before(jiff, priv->last_expires))
timer->sticks = priv->last_expires - jiff;
@@ -1147,14 +1167,14 @@ static int snd_timer_s_close(struct snd_timer *timer)
struct snd_timer_system_private *priv;
priv = (struct snd_timer_system_private *)timer->private_data;
- del_timer_sync(&priv->tlist);
+ timer_delete_sync(&priv->tlist);
return 0;
}
static const struct snd_timer_hardware snd_timer_system =
{
.flags = SNDRV_TIMER_HW_FIRST | SNDRV_TIMER_HW_WORK,
- .resolution = 1000000000L / HZ,
+ .resolution = NSEC_PER_SEC / HZ,
.ticks = 10000000L,
.close = snd_timer_s_close,
.start = snd_timer_s_start,
@@ -1495,91 +1515,97 @@ static void snd_timer_user_copy_id(struct snd_timer_id *id, struct snd_timer *ti
id->subdevice = timer->tmr_subdevice;
}
-static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
+static void get_next_device(struct snd_timer_id *id)
{
- struct snd_timer_id id;
struct snd_timer *timer;
struct list_head *p;
- if (copy_from_user(&id, _tid, sizeof(id)))
- return -EFAULT;
- guard(mutex)(&register_mutex);
- if (id.dev_class < 0) { /* first item */
+ if (id->dev_class < 0) { /* first item */
if (list_empty(&snd_timer_list))
- snd_timer_user_zero_id(&id);
+ snd_timer_user_zero_id(id);
else {
timer = list_entry(snd_timer_list.next,
struct snd_timer, device_list);
- snd_timer_user_copy_id(&id, timer);
+ snd_timer_user_copy_id(id, timer);
}
} else {
- switch (id.dev_class) {
+ switch (id->dev_class) {
case SNDRV_TIMER_CLASS_GLOBAL:
- id.device = id.device < 0 ? 0 : id.device + 1;
+ id->device = id->device < 0 ? 0 : id->device + 1;
list_for_each(p, &snd_timer_list) {
timer = list_entry(p, struct snd_timer, device_list);
if (timer->tmr_class > SNDRV_TIMER_CLASS_GLOBAL) {
- snd_timer_user_copy_id(&id, timer);
+ snd_timer_user_copy_id(id, timer);
break;
}
- if (timer->tmr_device >= id.device) {
- snd_timer_user_copy_id(&id, timer);
+ if (timer->tmr_device >= id->device) {
+ snd_timer_user_copy_id(id, timer);
break;
}
}
if (p == &snd_timer_list)
- snd_timer_user_zero_id(&id);
+ snd_timer_user_zero_id(id);
break;
case SNDRV_TIMER_CLASS_CARD:
case SNDRV_TIMER_CLASS_PCM:
- if (id.card < 0) {
- id.card = 0;
+ if (id->card < 0) {
+ id->card = 0;
} else {
- if (id.device < 0) {
- id.device = 0;
+ if (id->device < 0) {
+ id->device = 0;
} else {
- if (id.subdevice < 0)
- id.subdevice = 0;
- else if (id.subdevice < INT_MAX)
- id.subdevice++;
+ if (id->subdevice < 0)
+ id->subdevice = 0;
+ else if (id->subdevice < INT_MAX)
+ id->subdevice++;
}
}
list_for_each(p, &snd_timer_list) {
timer = list_entry(p, struct snd_timer, device_list);
- if (timer->tmr_class > id.dev_class) {
- snd_timer_user_copy_id(&id, timer);
+ if (timer->tmr_class > id->dev_class) {
+ snd_timer_user_copy_id(id, timer);
break;
}
- if (timer->tmr_class < id.dev_class)
+ if (timer->tmr_class < id->dev_class)
continue;
- if (timer->card->number > id.card) {
- snd_timer_user_copy_id(&id, timer);
+ if (timer->card->number > id->card) {
+ snd_timer_user_copy_id(id, timer);
break;
}
- if (timer->card->number < id.card)
+ if (timer->card->number < id->card)
continue;
- if (timer->tmr_device > id.device) {
- snd_timer_user_copy_id(&id, timer);
+ if (timer->tmr_device > id->device) {
+ snd_timer_user_copy_id(id, timer);
break;
}
- if (timer->tmr_device < id.device)
+ if (timer->tmr_device < id->device)
continue;
- if (timer->tmr_subdevice > id.subdevice) {
- snd_timer_user_copy_id(&id, timer);
+ if (timer->tmr_subdevice > id->subdevice) {
+ snd_timer_user_copy_id(id, timer);
break;
}
- if (timer->tmr_subdevice < id.subdevice)
+ if (timer->tmr_subdevice < id->subdevice)
continue;
- snd_timer_user_copy_id(&id, timer);
+ snd_timer_user_copy_id(id, timer);
break;
}
if (p == &snd_timer_list)
- snd_timer_user_zero_id(&id);
+ snd_timer_user_zero_id(id);
break;
default:
- snd_timer_user_zero_id(&id);
+ snd_timer_user_zero_id(id);
}
}
+}
+
+static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
+{
+ struct snd_timer_id id;
+
+ if (copy_from_user(&id, _tid, sizeof(id)))
+ return -EFAULT;
+ scoped_guard(mutex, &register_mutex)
+ get_next_device(&id);
if (copy_to_user(_tid, &id, sizeof(*_tid)))
return -EFAULT;
return 0;
@@ -1595,28 +1621,29 @@ static int snd_timer_user_ginfo(struct file *file,
ginfo = memdup_user(_ginfo, sizeof(*ginfo));
if (IS_ERR(ginfo))
- return PTR_ERR(no_free_ptr(ginfo));
+ return PTR_ERR(ginfo);
tid = ginfo->tid;
memset(ginfo, 0, sizeof(*ginfo));
ginfo->tid = tid;
- guard(mutex)(&register_mutex);
- t = snd_timer_find(&tid);
- if (!t)
- return -ENODEV;
- ginfo->card = t->card ? t->card->number : -1;
- if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
- ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
- strscpy(ginfo->id, t->id, sizeof(ginfo->id));
- strscpy(ginfo->name, t->name, sizeof(ginfo->name));
- scoped_guard(spinlock_irq, &t->lock)
- ginfo->resolution = snd_timer_hw_resolution(t);
- if (t->hw.resolution_min > 0) {
- ginfo->resolution_min = t->hw.resolution_min;
- ginfo->resolution_max = t->hw.resolution_max;
- }
- list_for_each(p, &t->open_list_head) {
- ginfo->clients++;
+ scoped_guard(mutex, &register_mutex) {
+ t = snd_timer_find(&tid);
+ if (!t)
+ return -ENODEV;
+ ginfo->card = t->card ? t->card->number : -1;
+ if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
+ ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
+ strscpy(ginfo->id, t->id, sizeof(ginfo->id));
+ strscpy(ginfo->name, t->name, sizeof(ginfo->name));
+ scoped_guard(spinlock_irq, &t->lock)
+ ginfo->resolution = snd_timer_hw_resolution(t);
+ if (t->hw.resolution_min > 0) {
+ ginfo->resolution_min = t->hw.resolution_min;
+ ginfo->resolution_max = t->hw.resolution_max;
+ }
+ list_for_each(p, &t->open_list_head) {
+ ginfo->clients++;
+ }
}
if (copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
return -EFAULT;
@@ -1654,31 +1681,31 @@ static int snd_timer_user_gstatus(struct file *file,
struct snd_timer_gstatus gstatus;
struct snd_timer_id tid;
struct snd_timer *t;
- int err = 0;
if (copy_from_user(&gstatus, _gstatus, sizeof(gstatus)))
return -EFAULT;
tid = gstatus.tid;
memset(&gstatus, 0, sizeof(gstatus));
gstatus.tid = tid;
- guard(mutex)(&register_mutex);
- t = snd_timer_find(&tid);
- if (t != NULL) {
- guard(spinlock_irq)(&t->lock);
- gstatus.resolution = snd_timer_hw_resolution(t);
- if (t->hw.precise_resolution) {
- t->hw.precise_resolution(t, &gstatus.resolution_num,
- &gstatus.resolution_den);
+ scoped_guard(mutex, &register_mutex) {
+ t = snd_timer_find(&tid);
+ if (t != NULL) {
+ guard(spinlock_irq)(&t->lock);
+ gstatus.resolution = snd_timer_hw_resolution(t);
+ if (t->hw.precise_resolution) {
+ t->hw.precise_resolution(t, &gstatus.resolution_num,
+ &gstatus.resolution_den);
+ } else {
+ gstatus.resolution_num = gstatus.resolution;
+ gstatus.resolution_den = 1000000000uL;
+ }
} else {
- gstatus.resolution_num = gstatus.resolution;
- gstatus.resolution_den = 1000000000uL;
+ return -ENODEV;
}
- } else {
- err = -ENODEV;
}
- if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
- err = -EFAULT;
- return err;
+ if (copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
+ return -EFAULT;
+ return 0;
}
static int snd_timer_user_tselect(struct file *file,
@@ -2001,6 +2028,217 @@ enum {
SNDRV_TIMER_IOCTL_PAUSE_OLD = _IO('T', 0x23),
};
+#ifdef CONFIG_SND_UTIMER
+/*
+ * Since userspace-driven timers are passed to userspace, we need to have an identifier
+ * which will allow us to use them (basically, the subdevice number of udriven timer).
+ */
+static DEFINE_IDA(snd_utimer_ids);
+
+static void snd_utimer_put_id(struct snd_utimer *utimer)
+{
+ int timer_id = utimer->id;
+
+ snd_BUG_ON(timer_id < 0 || timer_id >= SNDRV_UTIMERS_MAX_COUNT);
+ ida_free(&snd_utimer_ids, timer_id);
+}
+
+static int snd_utimer_take_id(void)
+{
+ return ida_alloc_max(&snd_utimer_ids, SNDRV_UTIMERS_MAX_COUNT - 1, GFP_KERNEL);
+}
+
+static void snd_utimer_free(struct snd_utimer *utimer)
+{
+ snd_timer_free(utimer->timer);
+ snd_utimer_put_id(utimer);
+ kfree(utimer->name);
+ kfree(utimer);
+}
+
+static int snd_utimer_release(struct inode *inode, struct file *file)
+{
+ struct snd_utimer *utimer = (struct snd_utimer *)file->private_data;
+
+ snd_utimer_free(utimer);
+ return 0;
+}
+
+static int snd_utimer_trigger(struct file *file)
+{
+ struct snd_utimer *utimer = (struct snd_utimer *)file->private_data;
+
+ snd_timer_interrupt(utimer->timer, utimer->timer->sticks);
+ return 0;
+}
+
+static long snd_utimer_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
+{
+ switch (ioctl) {
+ case SNDRV_TIMER_IOCTL_TRIGGER:
+ return snd_utimer_trigger(file);
+ }
+
+ return -ENOTTY;
+}
+
+static const struct file_operations snd_utimer_fops = {
+ .llseek = noop_llseek,
+ .release = snd_utimer_release,
+ .unlocked_ioctl = snd_utimer_ioctl,
+};
+
+static int snd_utimer_start(struct snd_timer *t)
+{
+ return 0;
+}
+
+static int snd_utimer_stop(struct snd_timer *t)
+{
+ return 0;
+}
+
+static int snd_utimer_open(struct snd_timer *t)
+{
+ return 0;
+}
+
+static int snd_utimer_close(struct snd_timer *t)
+{
+ return 0;
+}
+
+static const struct snd_timer_hardware timer_hw = {
+ .flags = SNDRV_TIMER_HW_AUTO | SNDRV_TIMER_HW_WORK,
+ .open = snd_utimer_open,
+ .close = snd_utimer_close,
+ .start = snd_utimer_start,
+ .stop = snd_utimer_stop,
+};
+
+static int snd_utimer_create(struct snd_timer_uinfo *utimer_info,
+ struct snd_utimer **r_utimer)
+{
+ struct snd_utimer *utimer;
+ struct snd_timer *timer;
+ struct snd_timer_id tid;
+ int utimer_id;
+ int err = 0;
+
+ if (!utimer_info || utimer_info->resolution == 0)
+ return -EINVAL;
+
+ utimer = kzalloc(sizeof(*utimer), GFP_KERNEL);
+ if (!utimer)
+ return -ENOMEM;
+
+ /* We hold the ioctl lock here so we won't get a race condition when allocating id */
+ utimer_id = snd_utimer_take_id();
+ if (utimer_id < 0) {
+ err = utimer_id;
+ goto err_take_id;
+ }
+
+ utimer->name = kasprintf(GFP_KERNEL, "snd-utimer%d", utimer_id);
+ if (!utimer->name) {
+ err = -ENOMEM;
+ goto err_get_name;
+ }
+
+ utimer->id = utimer_id;
+
+ tid.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
+ tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
+ tid.card = -1;
+ tid.device = SNDRV_TIMER_GLOBAL_UDRIVEN;
+ tid.subdevice = utimer_id;
+
+ err = snd_timer_new(NULL, utimer->name, &tid, &timer);
+ if (err < 0) {
+ pr_err("Can't create userspace-driven timer\n");
+ goto err_timer_new;
+ }
+
+ timer->module = THIS_MODULE;
+ timer->hw = timer_hw;
+ timer->hw.resolution = utimer_info->resolution;
+ timer->hw.ticks = 1;
+ timer->max_instances = MAX_SLAVE_INSTANCES;
+
+ utimer->timer = timer;
+
+ err = snd_timer_global_register(timer);
+ if (err < 0) {
+ pr_err("Can't register a userspace-driven timer\n");
+ goto err_timer_reg;
+ }
+
+ *r_utimer = utimer;
+ return 0;
+
+err_timer_reg:
+ snd_timer_free(timer);
+err_timer_new:
+ kfree(utimer->name);
+err_get_name:
+ snd_utimer_put_id(utimer);
+err_take_id:
+ kfree(utimer);
+
+ return err;
+}
+
+static int snd_utimer_ioctl_create(struct file *file,
+ struct snd_timer_uinfo __user *_utimer_info)
+{
+ struct snd_utimer *utimer;
+ struct snd_timer_uinfo *utimer_info __free(kfree) = NULL;
+ int err, timer_fd;
+
+ utimer_info = memdup_user(_utimer_info, sizeof(*utimer_info));
+ if (IS_ERR(utimer_info))
+ return PTR_ERR(utimer_info);
+
+ err = snd_utimer_create(utimer_info, &utimer);
+ if (err < 0)
+ return err;
+
+ utimer_info->id = utimer->id;
+
+ timer_fd = anon_inode_getfd(utimer->name, &snd_utimer_fops, utimer, O_RDWR | O_CLOEXEC);
+ if (timer_fd < 0) {
+ snd_utimer_free(utimer);
+ return timer_fd;
+ }
+
+ utimer_info->fd = timer_fd;
+
+ err = copy_to_user(_utimer_info, utimer_info, sizeof(*utimer_info));
+ if (err) {
+ /*
+ * "Leak" the fd, as there is nothing we can do about it.
+ * It might have been closed already since anon_inode_getfd
+ * makes it available for userspace.
+ *
+ * We have to rely on the process exit path to do any
+ * necessary cleanup (e.g. releasing the file).
+ */
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+#else
+
+static int snd_utimer_ioctl_create(struct file *file,
+ struct snd_timer_uinfo __user *_utimer_info)
+{
+ return -ENOTTY;
+}
+
+#endif
+
static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
unsigned long arg, bool compat)
{
@@ -2045,6 +2283,8 @@ static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
case SNDRV_TIMER_IOCTL_PAUSE:
case SNDRV_TIMER_IOCTL_PAUSE_OLD:
return snd_timer_user_pause(file);
+ case SNDRV_TIMER_IOCTL_CREATE:
+ return snd_utimer_ioctl_create(file, argp);
}
return -ENOTTY;
}
@@ -2203,7 +2443,6 @@ static const struct file_operations snd_timer_f_ops =
.read = snd_timer_user_read,
.open = snd_timer_user_open,
.release = snd_timer_user_release,
- .llseek = no_llseek,
.poll = snd_timer_user_poll,
.unlocked_ioctl = snd_timer_user_ioctl,
.compat_ioctl = snd_timer_user_ioctl_compat,
generated by cgit (git 2.34.1) at 2025-07-23 21:56:28 +0000