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pcm_native.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Digital Audio (PCM) abstract layer
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*/
#include <linux/compat.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/sched/signal.h>
#include <linux/time.h>
#include <linux/pm_qos.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/vmalloc.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/timer.h>
#include <sound/minors.h>
#include <linux/uio.h>
#include <linux/delay.h>
#include "pcm_local.h"
#ifdef CONFIG_SND_DEBUG
#define CREATE_TRACE_POINTS
#include "pcm_param_trace.h"
#else
#define trace_hw_mask_param_enabled() 0
#define trace_hw_interval_param_enabled() 0
#define trace_hw_mask_param(substream, type, index, prev, curr)
#define trace_hw_interval_param(substream, type, index, prev, curr)
#endif
/*
* Compatibility
*/
struct snd_pcm_hw_params_old {
unsigned int flags;
unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
SNDRV_PCM_HW_PARAM_ACCESS + 1];
struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
unsigned int rmask;
unsigned int cmask;
unsigned int info;
unsigned int msbits;
unsigned int rate_num;
unsigned int rate_den;
snd_pcm_uframes_t fifo_size;
unsigned char reserved[64];
};
#ifdef CONFIG_SND_SUPPORT_OLD_API
#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params_old __user * _oparams);
static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params_old __user * _oparams);
#endif
static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
/*
*
*/
static DECLARE_RWSEM(snd_pcm_link_rwsem);
void snd_pcm_group_init(struct snd_pcm_group *group)
{
spin_lock_init(&group->lock);
mutex_init(&group->mutex);
INIT_LIST_HEAD(&group->substreams);
refcount_set(&group->refs, 1);
}
/* define group lock helpers */
#define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
{ \
if (nonatomic) \
mutex_ ## mutex_action(&group->mutex); \
else \
spin_ ## action(&group->lock); \
}
DEFINE_PCM_GROUP_LOCK(lock, lock);
DEFINE_PCM_GROUP_LOCK(unlock, unlock);
DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
/**
* snd_pcm_stream_lock - Lock the PCM stream
* @substream: PCM substream
*
* This locks the PCM stream's spinlock or mutex depending on the nonatomic
* flag of the given substream. This also takes the global link rw lock
* (or rw sem), too, for avoiding the race with linked streams.
*/
void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
{
snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
/**
* snd_pcm_stream_unlock - Unlock the PCM stream
* @substream: PCM substream
*
* This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
*/
void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
{
snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
/**
* snd_pcm_stream_lock_irq - Lock the PCM stream
* @substream: PCM substream
*
* This locks the PCM stream like snd_pcm_stream_lock() and disables the local
* IRQ (only when nonatomic is false). In nonatomic case, this is identical
* as snd_pcm_stream_lock().
*/
void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
{
snd_pcm_group_lock_irq(&substream->self_group,
substream->pcm->nonatomic);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream)
{
struct snd_pcm_group *group = &substream->self_group;
if (substream->pcm->nonatomic)
mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING);
else
spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING);
}
/**
* snd_pcm_stream_unlock_irq - Unlock the PCM stream
* @substream: PCM substream
*
* This is a counter-part of snd_pcm_stream_lock_irq().
*/
void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
{
snd_pcm_group_unlock_irq(&substream->self_group,
substream->pcm->nonatomic);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
{
unsigned long flags = 0;
if (substream->pcm->nonatomic)
mutex_lock(&substream->self_group.mutex);
else
spin_lock_irqsave(&substream->self_group.lock, flags);
return flags;
}
EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream)
{
unsigned long flags = 0;
if (substream->pcm->nonatomic)
mutex_lock_nested(&substream->self_group.mutex,
SINGLE_DEPTH_NESTING);
else
spin_lock_irqsave_nested(&substream->self_group.lock, flags,
SINGLE_DEPTH_NESTING);
return flags;
}
EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested);
/**
* snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
* @substream: PCM substream
* @flags: irq flags
*
* This is a counter-part of snd_pcm_stream_lock_irqsave().
*/
void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
unsigned long flags)
{
if (substream->pcm->nonatomic)
mutex_unlock(&substream->self_group.mutex);
else
spin_unlock_irqrestore(&substream->self_group.lock, flags);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
/* Run PCM ioctl ops */
static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
unsigned cmd, void *arg)
{
if (substream->ops->ioctl)
return substream->ops->ioctl(substream, cmd, arg);
else
return snd_pcm_lib_ioctl(substream, cmd, arg);
}
int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
{
struct snd_pcm *pcm = substream->pcm;
struct snd_pcm_str *pstr = substream->pstr;
memset(info, 0, sizeof(*info));
info->card = pcm->card->number;
info->device = pcm->device;
info->stream = substream->stream;
info->subdevice = substream->number;
strscpy(info->id, pcm->id, sizeof(info->id));
strscpy(info->name, pcm->name, sizeof(info->name));
info->dev_class = pcm->dev_class;
info->dev_subclass = pcm->dev_subclass;
info->subdevices_count = pstr->substream_count;
info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
strscpy(info->subname, substream->name, sizeof(info->subname));
return 0;
}
int snd_pcm_info_user(struct snd_pcm_substream *substream,
struct snd_pcm_info __user * _info)
{
struct snd_pcm_info *info __free(kfree) = NULL;
int err;
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (! info)
return -ENOMEM;
err = snd_pcm_info(substream, info);
if (err >= 0) {
if (copy_to_user(_info, info, sizeof(*info)))
err = -EFAULT;
}
return err;
}
/* macro for simplified cast */
#define PARAM_MASK_BIT(b) (1U << (__force int)(b))
static bool hw_support_mmap(struct snd_pcm_substream *substream)
{
struct snd_dma_buffer *dmabuf;
if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
return false;
if (substream->ops->mmap || substream->ops->page)
return true;
dmabuf = snd_pcm_get_dma_buf(substream);
if (!dmabuf)
dmabuf = &substream->dma_buffer;
switch (dmabuf->dev.type) {
case SNDRV_DMA_TYPE_UNKNOWN:
/* we can't know the device, so just assume that the driver does
* everything right
*/
return true;
case SNDRV_DMA_TYPE_CONTINUOUS:
case SNDRV_DMA_TYPE_VMALLOC:
return true;
default:
return dma_can_mmap(dmabuf->dev.dev);
}
}
static int constrain_mask_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_pcm_hw_constraints *constrs =
&substream->runtime->hw_constraints;
struct snd_mask *m;
unsigned int k;
struct snd_mask old_mask __maybe_unused;
int changed;
for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
m = hw_param_mask(params, k);
if (snd_mask_empty(m))
return -EINVAL;
/* This parameter is not requested to change by a caller. */
if (!(params->rmask & PARAM_MASK_BIT(k)))
continue;
if (trace_hw_mask_param_enabled())
old_mask = *m;
changed = snd_mask_refine(m, constrs_mask(constrs, k));
if (changed < 0)
return changed;
if (changed == 0)
continue;
/* Set corresponding flag so that the caller gets it. */
trace_hw_mask_param(substream, k, 0, &old_mask, m);
params->cmask |= PARAM_MASK_BIT(k);
}
return 0;
}
static int constrain_interval_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_pcm_hw_constraints *constrs =
&substream->runtime->hw_constraints;
struct snd_interval *i;
unsigned int k;
struct snd_interval old_interval __maybe_unused;
int changed;
for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
i = hw_param_interval(params, k);
if (snd_interval_empty(i))
return -EINVAL;
/* This parameter is not requested to change by a caller. */
if (!(params->rmask & PARAM_MASK_BIT(k)))
continue;
if (trace_hw_interval_param_enabled())
old_interval = *i;
changed = snd_interval_refine(i, constrs_interval(constrs, k));
if (changed < 0)
return changed;
if (changed == 0)
continue;
/* Set corresponding flag so that the caller gets it. */
trace_hw_interval_param(substream, k, 0, &old_interval, i);
params->cmask |= PARAM_MASK_BIT(k);
}
return 0;
}
static int constrain_params_by_rules(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_pcm_hw_constraints *constrs =
&substream->runtime->hw_constraints;
unsigned int k;
unsigned int *rstamps __free(kfree) = NULL;
unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
unsigned int stamp;
struct snd_pcm_hw_rule *r;
unsigned int d;
struct snd_mask old_mask __maybe_unused;
struct snd_interval old_interval __maybe_unused;
bool again;
int changed, err = 0;
/*
* Each application of rule has own sequence number.
*
* Each member of 'rstamps' array represents the sequence number of
* recent application of corresponding rule.
*/
rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
if (!rstamps)
return -ENOMEM;
/*
* Each member of 'vstamps' array represents the sequence number of
* recent application of rule in which corresponding parameters were
* changed.
*
* In initial state, elements corresponding to parameters requested by
* a caller is 1. For unrequested parameters, corresponding members
* have 0 so that the parameters are never changed anymore.
*/
for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0;
/* Due to the above design, actual sequence number starts at 2. */
stamp = 2;
retry:
/* Apply all rules in order. */
again = false;
for (k = 0; k < constrs->rules_num; k++) {
r = &constrs->rules[k];
/*
* Check condition bits of this rule. When the rule has
* some condition bits, parameter without the bits is
* never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
* is an example of the condition bits.
*/
if (r->cond && !(r->cond & params->flags))
continue;
/*
* The 'deps' array includes maximum four dependencies
* to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth
* member of this array is a sentinel and should be
* negative value.
*
* This rule should be processed in this time when dependent
* parameters were changed at former applications of the other
* rules.
*/
for (d = 0; r->deps[d] >= 0; d++) {
if (vstamps[r->deps[d]] > rstamps[k])
break;
}
if (r->deps[d] < 0)
continue;
if (trace_hw_mask_param_enabled()) {
if (hw_is_mask(r->var))
old_mask = *hw_param_mask(params, r->var);
}
if (trace_hw_interval_param_enabled()) {
if (hw_is_interval(r->var))
old_interval = *hw_param_interval(params, r->var);
}
changed = r->func(params, r);
if (changed < 0)
return changed;
/*
* When the parameter is changed, notify it to the caller
* by corresponding returned bit, then preparing for next
* iteration.
*/
if (changed && r->var >= 0) {
if (hw_is_mask(r->var)) {
trace_hw_mask_param(substream, r->var,
k + 1, &old_mask,
hw_param_mask(params, r->var));
}
if (hw_is_interval(r->var)) {
trace_hw_interval_param(substream, r->var,
k + 1, &old_interval,
hw_param_interval(params, r->var));
}
params->cmask |= PARAM_MASK_BIT(r->var);
vstamps[r->var] = stamp;
again = true;
}
rstamps[k] = stamp++;
}
/* Iterate to evaluate all rules till no parameters are changed. */
if (again)
goto retry;
return err;
}
static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
const struct snd_interval *i;
const struct snd_mask *m;
struct snd_mask *m_rw;
int err;
if (!params->msbits) {
i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
if (snd_interval_single(i))
params->msbits = snd_interval_value(i);
m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
if (snd_mask_single(m)) {
snd_pcm_format_t format = (__force snd_pcm_format_t)snd_mask_min(m);
params->msbits = snd_pcm_format_width(format);
}
}
if (params->msbits) {
m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
if (snd_mask_single(m)) {
snd_pcm_format_t format = (__force snd_pcm_format_t)snd_mask_min(m);
if (snd_pcm_format_linear(format) &&
snd_pcm_format_width(format) != params->msbits) {
m_rw = hw_param_mask(params, SNDRV_PCM_HW_PARAM_SUBFORMAT);
snd_mask_reset(m_rw,
(__force unsigned)SNDRV_PCM_SUBFORMAT_MSBITS_MAX);
if (snd_mask_empty(m_rw))
return -EINVAL;
}
}
}
if (!params->rate_den) {
i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
if (snd_interval_single(i)) {
params->rate_num = snd_interval_value(i);
params->rate_den = 1;
}
}
if (!params->fifo_size) {
m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
if (snd_mask_single(m) && snd_interval_single(i)) {
err = snd_pcm_ops_ioctl(substream,
SNDRV_PCM_IOCTL1_FIFO_SIZE,
params);
if (err < 0)
return err;
}
}
if (!params->info) {
params->info = substream->runtime->hw.info;
params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
SNDRV_PCM_INFO_DRAIN_TRIGGER);
if (!hw_support_mmap(substream))
params->info &= ~(SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID);
}
err = snd_pcm_ops_ioctl(substream,
SNDRV_PCM_IOCTL1_SYNC_ID,
params);
if (err < 0)
return err;
return 0;
}
int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
int err;
params->info = 0;
params->fifo_size = 0;
if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
params->msbits = 0;
if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) {
params->rate_num = 0;
params->rate_den = 0;
}
err = constrain_mask_params(substream, params);
if (err < 0)
return err;
err = constrain_interval_params(substream, params);
if (err < 0)
return err;
err = constrain_params_by_rules(substream, params);
if (err < 0)
return err;
params->rmask = 0;
return 0;
}
EXPORT_SYMBOL(snd_pcm_hw_refine);
static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params __user * _params)
{
struct snd_pcm_hw_params *params __free(kfree) = NULL;
int err;
params = memdup_user(_params, sizeof(*params));
if (IS_ERR(params))
return PTR_ERR(no_free_ptr(params));
err = snd_pcm_hw_refine(substream, params);
if (err < 0)
return err;
err = fixup_unreferenced_params(substream, params);
if (err < 0)
return err;
if (copy_to_user(_params, params, sizeof(*params)))
return -EFAULT;
return 0;
}
static int period_to_usecs(struct snd_pcm_runtime *runtime)
{
int usecs;
if (! runtime->rate)
return -1; /* invalid */
/* take 75% of period time as the deadline */
usecs = (750000 / runtime->rate) * runtime->period_size;
usecs += ((750000 % runtime->rate) * runtime->period_size) /
runtime->rate;
return usecs;
}
static void snd_pcm_set_state(struct snd_pcm_substream *substream,
snd_pcm_state_t state)
{
guard(pcm_stream_lock_irq)(substream);
if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED)
__snd_pcm_set_state(substream->runtime, state);
}
static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
int event)
{
#ifdef CONFIG_SND_PCM_TIMER
if (substream->timer)
snd_timer_notify(substream->timer, event,
&substream->runtime->trigger_tstamp);
#endif
}
void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq)
{
if (substream->runtime && substream->runtime->stop_operating) {
substream->runtime->stop_operating = false;
if (substream->ops && substream->ops->sync_stop)
substream->ops->sync_stop(substream);
else if (sync_irq && substream->pcm->card->sync_irq > 0)
synchronize_irq(substream->pcm->card->sync_irq);
}
}
/**
* snd_pcm_hw_params_choose - choose a configuration defined by @params
* @pcm: PCM instance
* @params: the hw_params instance
*
* Choose one configuration from configuration space defined by @params.
* The configuration chosen is that obtained fixing in this order:
* first access, first format, first subformat, min channels,
* min rate, min period time, max buffer size, min tick time
*
* Return: Zero if successful, or a negative error code on failure.
*/
static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
struct snd_pcm_hw_params *params)
{
static const int vars[] = {
SNDRV_PCM_HW_PARAM_ACCESS,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_SUBFORMAT,
SNDRV_PCM_HW_PARAM_CHANNELS,
SNDRV_PCM_HW_PARAM_RATE,
SNDRV_PCM_HW_PARAM_PERIOD_TIME,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
SNDRV_PCM_HW_PARAM_TICK_TIME,
-1
};
const int *v;
struct snd_mask old_mask __maybe_unused;
struct snd_interval old_interval __maybe_unused;
int changed;
for (v = vars; *v != -1; v++) {
/* Keep old parameter to trace. */
if (trace_hw_mask_param_enabled()) {
if (hw_is_mask(*v))
old_mask = *hw_param_mask(params, *v);
}
if (trace_hw_interval_param_enabled()) {
if (hw_is_interval(*v))
old_interval = *hw_param_interval(params, *v);
}
if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
else
changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
if (changed < 0)
return changed;
if (changed == 0)
continue;
/* Trace the changed parameter. */
if (hw_is_mask(*v)) {
trace_hw_mask_param(pcm, *v, 0, &old_mask,
hw_param_mask(params, *v));
}
if (hw_is_interval(*v)) {
trace_hw_interval_param(pcm, *v, 0, &old_interval,
hw_param_interval(params, *v));
}
}
return 0;
}
/* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise
* block the further r/w operations
*/
static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime)
{
if (!atomic_dec_unless_positive(&runtime->buffer_accessing))
return -EBUSY;
mutex_lock(&runtime->buffer_mutex);
return 0; /* keep buffer_mutex, unlocked by below */
}
/* release buffer_mutex and clear r/w access flag */
static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime)
{
mutex_unlock(&runtime->buffer_mutex);
atomic_inc(&runtime->buffer_accessing);
}
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
#define is_oss_stream(substream) ((substream)->oss.oss)
#else
#define is_oss_stream(substream) false
#endif
static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_pcm_runtime *runtime;
int err, usecs;
unsigned int bits;
snd_pcm_uframes_t frames;
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;
runtime = substream->runtime;
err = snd_pcm_buffer_access_lock(runtime);
if (err < 0)
return err;
scoped_guard(pcm_stream_lock_irq, substream) {
switch (runtime->state) {
case SNDRV_PCM_STATE_OPEN:
case SNDRV_PCM_STATE_SETUP:
case SNDRV_PCM_STATE_PREPARED:
if (!is_oss_stream(substream) &&
atomic_read(&substream->mmap_count))
err = -EBADFD;
break;
default:
err = -EBADFD;
break;
}
}
if (err)
goto unlock;
snd_pcm_sync_stop(substream, true);
params->rmask = ~0U;
err = snd_pcm_hw_refine(substream, params);
if (err < 0)
goto _error;
err = snd_pcm_hw_params_choose(substream, params);
if (err < 0)
goto _error;
err = fixup_unreferenced_params(substream, params);
if (err < 0)
goto _error;
if (substream->managed_buffer_alloc) {
err = snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(params));
if (err < 0)
goto _error;
runtime->buffer_changed = err > 0;
}
if (substream->ops->hw_params != NULL) {
err = substream->ops->hw_params(substream, params);
if (err < 0)
goto _error;
}
runtime->access = params_access(params);
runtime->format = params_format(params);
runtime->subformat = params_subformat(params);
runtime->channels = params_channels(params);
runtime->rate = params_rate(params);
runtime->period_size = params_period_size(params);
runtime->periods = params_periods(params);
runtime->buffer_size = params_buffer_size(params);
runtime->info = params->info;
runtime->rate_num = params->rate_num;
runtime->rate_den = params->rate_den;
runtime->no_period_wakeup =
(params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
(params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
bits = snd_pcm_format_physical_width(runtime->format);
runtime->sample_bits = bits;
bits *= runtime->channels;
runtime->frame_bits = bits;
frames = 1;
while (bits % 8 != 0) {
bits *= 2;
frames *= 2;
}
runtime->byte_align = bits / 8;
runtime->min_align = frames;
/* Default sw params */
runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
runtime->period_step = 1;
runtime->control->avail_min = runtime->period_size;
runtime->start_threshold = 1;
runtime->stop_threshold = runtime->buffer_size;
runtime->silence_threshold = 0;
runtime->silence_size = 0;
runtime->boundary = runtime->buffer_size;
while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
runtime->boundary *= 2;
/* clear the buffer for avoiding possible kernel info leaks */
if (runtime->dma_area && !substream->ops->copy) {
size_t size = runtime->dma_bytes;
if (runtime->info & SNDRV_PCM_INFO_MMAP)
size = PAGE_ALIGN(size);
memset(runtime->dma_area, 0, size);
}
snd_pcm_timer_resolution_change(substream);
snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
usecs = period_to_usecs(runtime);
if (usecs >= 0)
cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
usecs);
err = 0;
_error:
if (err) {
/* hardware might be unusable from this time,
* so we force application to retry to set
* the correct hardware parameter settings
*/
snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
if (substream->ops->hw_free != NULL)
substream->ops->hw_free(substream);
if (substream->managed_buffer_alloc)
snd_pcm_lib_free_pages(substream);
}
unlock:
snd_pcm_buffer_access_unlock(runtime);
return err;
}
static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params __user * _params)
{
struct snd_pcm_hw_params *params __free(kfree) = NULL;
int err;
params = memdup_user(_params, sizeof(*params));
if (IS_ERR(params))
return PTR_ERR(no_free_ptr(params));
err = snd_pcm_hw_params(substream, params);
if (err < 0)
return err;
if (copy_to_user(_params, params, sizeof(*params)))
return -EFAULT;
return err;
}
static int do_hw_free(struct snd_pcm_substream *substream)
{
int result = 0;
snd_pcm_sync_stop(substream, true);
if (substream->ops->hw_free)
result = substream->ops->hw_free(substream);
if (substream->managed_buffer_alloc)
snd_pcm_lib_free_pages(substream);
return result;
}
static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime;
int result = 0;
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;
runtime = substream->runtime;
result = snd_pcm_buffer_access_lock(runtime);
if (result < 0)
return result;
scoped_guard(pcm_stream_lock_irq, substream) {
switch (runtime->state) {
case SNDRV_PCM_STATE_SETUP:
case SNDRV_PCM_STATE_PREPARED:
if (atomic_read(&substream->mmap_count))
result = -EBADFD;
break;
default:
result = -EBADFD;
break;
}
}
if (result)
goto unlock;
result = do_hw_free(substream);
snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
unlock:
snd_pcm_buffer_access_unlock(runtime);
return result;
}
static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
struct snd_pcm_sw_params *params)
{
struct snd_pcm_runtime *runtime;
int err;
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;
runtime = substream->runtime;
scoped_guard(pcm_stream_lock_irq, substream) {
if (runtime->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
}
if (params->tstamp_mode < 0 ||
params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
return -EINVAL;
if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
return -EINVAL;
if (params->avail_min == 0)
return -EINVAL;
if (params->silence_size >= runtime->boundary) {
if (params->silence_threshold != 0)
return -EINVAL;
} else {
if (params->silence_size > params->silence_threshold)
return -EINVAL;
if (params->silence_threshold > runtime->buffer_size)
return -EINVAL;
}
err = 0;
scoped_guard(pcm_stream_lock_irq, substream) {
runtime->tstamp_mode = params->tstamp_mode;
if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
runtime->tstamp_type = params->tstamp_type;
runtime->period_step = params->period_step;
runtime->control->avail_min = params->avail_min;
runtime->start_threshold = params->start_threshold;
runtime->stop_threshold = params->stop_threshold;
runtime->silence_threshold = params->silence_threshold;
runtime->silence_size = params->silence_size;
params->boundary = runtime->boundary;
if (snd_pcm_running(substream)) {
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
runtime->silence_size > 0)
snd_pcm_playback_silence(substream, ULONG_MAX);
err = snd_pcm_update_state(substream, runtime);
}
}
return err;
}
static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
struct snd_pcm_sw_params __user * _params)
{
struct snd_pcm_sw_params params;
int err;
if (copy_from_user(¶ms, _params, sizeof(params)))
return -EFAULT;
err = snd_pcm_sw_params(substream, ¶ms);
if (copy_to_user(_params, ¶ms, sizeof(params)))
return -EFAULT;
return err;
}
static inline snd_pcm_uframes_t
snd_pcm_calc_delay(struct snd_pcm_substream *substream)
{
snd_pcm_uframes_t delay;