lisa/android_kernel_xiaomi_sm8350
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Revert "ALSA: pcm: Set per-card upper limit of PCM buffer allocations"

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This reverts commit 95b30a4312 which is
commit d4cfb30fce03093ad944e0b44bd8f40bdad5330e upstream.

It breaks the Android abi.  If it is required in the future, it can
come back in an abi-safe way.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I4e6a55ac7f3471fe8d8394c71e771eeaa7960400
This commit is contained in:
Greg Kroah-Hartman 2023-08-31 13:44:38 +00:00
parent c648a16974
commit 1abd0630e0
3 changed files with 18 additions and 55 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/sound/core.h
View File

@ -119,9 +119,6 @@ struct snd_card {
bool registered; /* card_dev is registered? */
wait_queue_head_t remove_sleep;
size_t total_pcm_alloc_bytes; /* total amount of allocated buffers */
struct mutex memory_mutex; /* protection for the above */
#ifdef CONFIG_PM
unsigned int power_state; /* power state */
wait_queue_head_t power_sleep;

1
sound/core/init.c
View File

@ -211,7 +211,6 @@ int snd_card_new(struct device *parent, int idx, const char *xid,
INIT_LIST_HEAD(&card->ctl_files);
spin_lock_init(&card->files_lock);
INIT_LIST_HEAD(&card->files_list);
mutex_init(&card->memory_mutex);
#ifdef CONFIG_PM
init_waitqueue_head(&card->power_sleep);
#endif

69
sound/core/pcm_memory.c
View File

@ -26,38 +26,6 @@ MODULE_PARM_DESC(maximum_substreams, "Maximum substreams with preallocated DMA m
static const size_t snd_minimum_buffer = 16384;
static unsigned long max_alloc_per_card = 32UL * 1024UL * 1024UL;
module_param(max_alloc_per_card, ulong, 0644);
MODULE_PARM_DESC(max_alloc_per_card, "Max total allocation bytes per card.");
static int do_alloc_pages(struct snd_card *card, int type, struct device *dev,
size_t size, struct snd_dma_buffer *dmab)
{
int err;
if (max_alloc_per_card &&
card->total_pcm_alloc_bytes + size > max_alloc_per_card)
return -ENOMEM;
err = snd_dma_alloc_pages(type, dev, size, dmab);
if (!err) {
mutex_lock(&card->memory_mutex);
card->total_pcm_alloc_bytes += dmab->bytes;
mutex_unlock(&card->memory_mutex);
}
return err;
}
static void do_free_pages(struct snd_card *card, struct snd_dma_buffer *dmab)
{
if (!dmab->area)
return;
mutex_lock(&card->memory_mutex);
WARN_ON(card->total_pcm_alloc_bytes < dmab->bytes);
card->total_pcm_alloc_bytes -= dmab->bytes;
mutex_unlock(&card->memory_mutex);
snd_dma_free_pages(dmab);
dmab->area = NULL;
}
/*
* try to allocate as the large pages as possible.
@ -68,15 +36,16 @@ static void do_free_pages(struct snd_card *card, struct snd_dma_buffer *dmab)
static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t size)
{
struct snd_dma_buffer *dmab = &substream->dma_buffer;
struct snd_card *card = substream->pcm->card;
size_t orig_size = size;
int err;
do {
err = do_alloc_pages(card, dmab->dev.type, dmab->dev.dev,
size, dmab);
if (err != -ENOMEM)
return err;
if ((err = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev,
size, dmab)) < 0) {
if (err != -ENOMEM)
return err; /* fatal error */
} else
return 0;
size >>= 1;
} while (size >= snd_minimum_buffer);
dmab->bytes = 0; /* tell error */
@ -92,7 +61,10 @@ static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t siz
*/
static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream)
{
do_free_pages(substream->pcm->card, &substream->dma_buffer);
if (substream->dma_buffer.area == NULL)
return;
snd_dma_free_pages(&substream->dma_buffer);
substream->dma_buffer.area = NULL;
}
/**
@ -157,7 +129,6 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
struct snd_pcm_substream *substream = entry->private_data;
struct snd_card *card = substream->pcm->card;
char line[64], str[64];
size_t size;
struct snd_dma_buffer new_dmab;
@ -179,10 +150,9 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry,
memset(&new_dmab, 0, sizeof(new_dmab));
new_dmab.dev = substream->dma_buffer.dev;
if (size > 0) {
if (do_alloc_pages(card,
substream->dma_buffer.dev.type,
substream->dma_buffer.dev.dev,
size, &new_dmab) < 0) {
if (snd_dma_alloc_pages(substream->dma_buffer.dev.type,
substream->dma_buffer.dev.dev,
size, &new_dmab) < 0) {
buffer->error = -ENOMEM;
goto unlock;
}
@ -191,7 +161,7 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry,
substream->buffer_bytes_max = UINT_MAX;
}
if (substream->dma_buffer.area)
do_free_pages(card, &substream->dma_buffer);
snd_dma_free_pages(&substream->dma_buffer);
substream->dma_buffer = new_dmab;
} else {
buffer->error = -EINVAL;
@ -319,7 +289,6 @@ EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
*/
int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size)
{
struct snd_card *card = substream->pcm->card;
struct snd_pcm_runtime *runtime;
struct snd_dma_buffer *dmab = NULL;
@ -348,10 +317,9 @@ int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size)
if (! dmab)
return -ENOMEM;
dmab->dev = substream->dma_buffer.dev;
if (do_alloc_pages(card,
substream->dma_buffer.dev.type,
substream->dma_buffer.dev.dev,
size, dmab) < 0) {
if (snd_dma_alloc_pages(substream->dma_buffer.dev.type,
substream->dma_buffer.dev.dev,
size, dmab) < 0) {
kfree(dmab);
return -ENOMEM;
}
@ -372,7 +340,6 @@ EXPORT_SYMBOL(snd_pcm_lib_malloc_pages);
*/
int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream)
{
struct snd_card *card = substream->pcm->card;
struct snd_pcm_runtime *runtime;
if (PCM_RUNTIME_CHECK(substream))
@ -382,7 +349,7 @@ int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream)
return 0;
if (runtime->dma_buffer_p != &substream->dma_buffer) {
/* it's a newly allocated buffer. release it now. */
do_free_pages(card, runtime->dma_buffer_p);
snd_dma_free_pages(runtime->dma_buffer_p);
kfree(runtime->dma_buffer_p);
}
snd_pcm_set_runtime_buffer(substream, NULL);