From a5969cabbb4660eab42b6ef0412cbbd1200cf14d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 12 Oct 2024 07:10:09 +0000
Subject: [PATCH] 修改led为gpio
---
kernel/sound/core/pcm_memory.c | 272 +++++++++++++++++++++++++++++++++++------------------
1 files changed, 179 insertions(+), 93 deletions(-)
diff --git a/kernel/sound/core/pcm_memory.c b/kernel/sound/core/pcm_memory.c
index 4b5356a..3e60a33 100644
--- a/kernel/sound/core/pcm_memory.c
+++ b/kernel/sound/core/pcm_memory.c
@@ -1,22 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Digital Audio (PCM) abstract layer
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
- *
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
*/
#include <linux/io.h>
@@ -30,6 +15,7 @@
#include <sound/pcm.h>
#include <sound/info.h>
#include <sound/initval.h>
+#include "pcm_local.h"
static int preallocate_dma = 1;
module_param(preallocate_dma, int, 0444);
@@ -41,6 +27,67 @@
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 void __update_allocated_size(struct snd_card *card, ssize_t bytes)
+{
+ card->total_pcm_alloc_bytes += bytes;
+}
+
+static void update_allocated_size(struct snd_card *card, ssize_t bytes)
+{
+ mutex_lock(&card->memory_mutex);
+ __update_allocated_size(card, bytes);
+ mutex_unlock(&card->memory_mutex);
+}
+
+static void decrease_allocated_size(struct snd_card *card, size_t bytes)
+{
+ mutex_lock(&card->memory_mutex);
+ WARN_ON(card->total_pcm_alloc_bytes < bytes);
+ __update_allocated_size(card, -(ssize_t)bytes);
+ mutex_unlock(&card->memory_mutex);
+}
+
+static int do_alloc_pages(struct snd_card *card, int type, struct device *dev,
+ size_t size, struct snd_dma_buffer *dmab)
+{
+ int err;
+
+ /* check and reserve the requested size */
+ mutex_lock(&card->memory_mutex);
+ if (max_alloc_per_card &&
+ card->total_pcm_alloc_bytes + size > max_alloc_per_card) {
+ mutex_unlock(&card->memory_mutex);
+ return -ENOMEM;
+ }
+ __update_allocated_size(card, size);
+ mutex_unlock(&card->memory_mutex);
+
+ err = snd_dma_alloc_pages(type, dev, size, dmab);
+ if (!err) {
+ /* the actual allocation size might be bigger than requested,
+ * and we need to correct the account
+ */
+ if (dmab->bytes != size)
+ update_allocated_size(card, dmab->bytes - size);
+ } else {
+ /* take back on allocation failure */
+ decrease_allocated_size(card, size);
+ }
+ return err;
+}
+
+static void do_free_pages(struct snd_card *card, struct snd_dma_buffer *dmab)
+{
+ if (!dmab->area)
+ return;
+ decrease_allocated_size(card, dmab->bytes);
+ snd_dma_free_pages(dmab);
+ dmab->area = NULL;
+}
/*
* try to allocate as the large pages as possible.
@@ -51,16 +98,15 @@
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 {
- 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;
+ err = do_alloc_pages(card, dmab->dev.type, dmab->dev.dev,
+ size, dmab);
+ if (err != -ENOMEM)
+ return err;
size >>= 1;
} while (size >= snd_minimum_buffer);
dmab->bytes = 0; /* tell error */
@@ -76,10 +122,7 @@
*/
static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream)
{
- if (substream->dma_buffer.area == NULL)
- return;
- snd_dma_free_pages(&substream->dma_buffer);
- substream->dma_buffer.area = NULL;
+ do_free_pages(substream->pcm->card, &substream->dma_buffer);
}
/**
@@ -87,19 +130,10 @@
* @substream: the pcm substream instance
*
* Releases the pre-allocated buffer of the given substream.
- *
- * Return: Zero if successful, or a negative error code on failure.
*/
-int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream)
+void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream)
{
snd_pcm_lib_preallocate_dma_free(substream);
-#ifdef CONFIG_SND_VERBOSE_PROCFS
- snd_info_free_entry(substream->proc_prealloc_max_entry);
- substream->proc_prealloc_max_entry = NULL;
- snd_info_free_entry(substream->proc_prealloc_entry);
- substream->proc_prealloc_entry = NULL;
-#endif
- return 0;
}
/**
@@ -107,10 +141,8 @@
* @pcm: the pcm instance
*
* Releases all the pre-allocated buffers on the given pcm.
- *
- * Return: Zero if successful, or a negative error code on failure.
*/
-int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm)
+void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm)
{
struct snd_pcm_substream *substream;
int stream;
@@ -118,7 +150,6 @@
for (stream = 0; stream < 2; stream++)
for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
snd_pcm_lib_preallocate_free(substream);
- return 0;
}
EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all);
@@ -156,68 +187,66 @@
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;
+ mutex_lock(&substream->pcm->open_mutex);
if (substream->runtime) {
buffer->error = -EBUSY;
- return;
+ goto unlock;
}
if (!snd_info_get_line(buffer, line, sizeof(line))) {
snd_info_get_str(str, line, sizeof(str));
size = simple_strtoul(str, NULL, 10) * 1024;
if ((size != 0 && size < 8192) || size > substream->dma_max) {
buffer->error = -EINVAL;
- return;
+ goto unlock;
}
if (substream->dma_buffer.bytes == size)
- return;
+ goto unlock;
memset(&new_dmab, 0, sizeof(new_dmab));
new_dmab.dev = substream->dma_buffer.dev;
if (size > 0) {
- if (snd_dma_alloc_pages(substream->dma_buffer.dev.type,
- substream->dma_buffer.dev.dev,
- size, &new_dmab) < 0) {
+ if (do_alloc_pages(card,
+ substream->dma_buffer.dev.type,
+ substream->dma_buffer.dev.dev,
+ size, &new_dmab) < 0) {
buffer->error = -ENOMEM;
- return;
+ goto unlock;
}
substream->buffer_bytes_max = size;
} else {
substream->buffer_bytes_max = UINT_MAX;
}
if (substream->dma_buffer.area)
- snd_dma_free_pages(&substream->dma_buffer);
+ do_free_pages(card, &substream->dma_buffer);
substream->dma_buffer = new_dmab;
} else {
buffer->error = -EINVAL;
}
+ unlock:
+ mutex_unlock(&substream->pcm->open_mutex);
}
static inline void preallocate_info_init(struct snd_pcm_substream *substream)
{
struct snd_info_entry *entry;
- if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc", substream->proc_root)) != NULL) {
- entry->c.text.read = snd_pcm_lib_preallocate_proc_read;
+ entry = snd_info_create_card_entry(substream->pcm->card, "prealloc",
+ substream->proc_root);
+ if (entry) {
+ snd_info_set_text_ops(entry, substream,
+ snd_pcm_lib_preallocate_proc_read);
entry->c.text.write = snd_pcm_lib_preallocate_proc_write;
entry->mode |= 0200;
- entry->private_data = substream;
- if (snd_info_register(entry) < 0) {
- snd_info_free_entry(entry);
- entry = NULL;
- }
}
- substream->proc_prealloc_entry = entry;
- if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc_max", substream->proc_root)) != NULL) {
- entry->c.text.read = snd_pcm_lib_preallocate_max_proc_read;
- entry->private_data = substream;
- if (snd_info_register(entry) < 0) {
- snd_info_free_entry(entry);
- entry = NULL;
- }
- }
- substream->proc_prealloc_max_entry = entry;
+ entry = snd_info_create_card_entry(substream->pcm->card, "prealloc_max",
+ substream->proc_root);
+ if (entry)
+ snd_info_set_text_ops(entry, substream,
+ snd_pcm_lib_preallocate_max_proc_read);
}
#else /* !CONFIG_SND_VERBOSE_PROCFS */
@@ -227,9 +256,15 @@
/*
* pre-allocate the buffer and create a proc file for the substream
*/
-static int snd_pcm_lib_preallocate_pages1(struct snd_pcm_substream *substream,
- size_t size, size_t max)
+static void preallocate_pages(struct snd_pcm_substream *substream,
+ int type, struct device *data,
+ size_t size, size_t max, bool managed)
{
+ if (snd_BUG_ON(substream->dma_buffer.dev.type))
+ return;
+
+ substream->dma_buffer.dev.type = type;
+ substream->dma_buffer.dev.dev = data;
if (size > 0 && preallocate_dma && substream->number < maximum_substreams)
preallocate_pcm_pages(substream, size);
@@ -237,10 +272,25 @@
if (substream->dma_buffer.bytes > 0)
substream->buffer_bytes_max = substream->dma_buffer.bytes;
substream->dma_max = max;
- preallocate_info_init(substream);
- return 0;
+ if (max > 0)
+ preallocate_info_init(substream);
+ if (managed)
+ substream->managed_buffer_alloc = 1;
}
+static void preallocate_pages_for_all(struct snd_pcm *pcm, int type,
+ void *data, size_t size, size_t max,
+ bool managed)
+{
+ struct snd_pcm_substream *substream;
+ int stream;
+
+ for (stream = 0; stream < 2; stream++)
+ for (substream = pcm->streams[stream].substream; substream;
+ substream = substream->next)
+ preallocate_pages(substream, type, data, size, max,
+ managed);
+}
/**
* snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type
@@ -251,16 +301,12 @@
* @max: the max. allowed pre-allocation size
*
* Do pre-allocation for the given DMA buffer type.
- *
- * Return: Zero if successful, or a negative error code on failure.
*/
-int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
+void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
int type, struct device *data,
size_t size, size_t max)
{
- substream->dma_buffer.dev.type = type;
- substream->dma_buffer.dev.dev = data;
- return snd_pcm_lib_preallocate_pages1(substream, size, max);
+ preallocate_pages(substream, type, data, size, max, false);
}
EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages);
@@ -274,26 +320,62 @@
*
* Do pre-allocation to all substreams of the given pcm for the
* specified DMA type.
- *
- * Return: Zero if successful, or a negative error code on failure.
*/
-int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
+void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
int type, void *data,
size_t size, size_t max)
{
- struct snd_pcm_substream *substream;
- int stream, err;
-
- for (stream = 0; stream < 2; stream++)
- for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
- if ((err = snd_pcm_lib_preallocate_pages(substream, type, data, size, max)) < 0)
- return err;
- return 0;
+ preallocate_pages_for_all(pcm, type, data, size, max, false);
}
EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all);
-#ifdef CONFIG_SND_DMA_SGBUF
/**
+ * snd_pcm_set_managed_buffer - set up buffer management for a substream
+ * @substream: the pcm substream instance
+ * @type: DMA type (SNDRV_DMA_TYPE_*)
+ * @data: DMA type dependent data
+ * @size: the requested pre-allocation size in bytes
+ * @max: the max. allowed pre-allocation size
+ *
+ * Do pre-allocation for the given DMA buffer type, and set the managed
+ * buffer allocation mode to the given substream.
+ * In this mode, PCM core will allocate a buffer automatically before PCM
+ * hw_params ops call, and release the buffer after PCM hw_free ops call
+ * as well, so that the driver doesn't need to invoke the allocation and
+ * the release explicitly in its callback.
+ * When a buffer is actually allocated before the PCM hw_params call, it
+ * turns on the runtime buffer_changed flag for drivers changing their h/w
+ * parameters accordingly.
+ */
+void snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type,
+ struct device *data, size_t size, size_t max)
+{
+ preallocate_pages(substream, type, data, size, max, true);
+}
+EXPORT_SYMBOL(snd_pcm_set_managed_buffer);
+
+/**
+ * snd_pcm_set_managed_buffer_all - set up buffer management for all substreams
+ * for all substreams
+ * @pcm: the pcm instance
+ * @type: DMA type (SNDRV_DMA_TYPE_*)
+ * @data: DMA type dependent data
+ * @size: the requested pre-allocation size in bytes
+ * @max: the max. allowed pre-allocation size
+ *
+ * Do pre-allocation to all substreams of the given pcm for the specified DMA
+ * type and size, and set the managed_buffer_alloc flag to each substream.
+ */
+void snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type,
+ struct device *data,
+ size_t size, size_t max)
+{
+ preallocate_pages_for_all(pcm, type, data, size, max, true);
+}
+EXPORT_SYMBOL(snd_pcm_set_managed_buffer_all);
+
+#ifdef CONFIG_SND_DMA_SGBUF
+/*
* snd_pcm_sgbuf_ops_page - get the page struct at the given offset
* @substream: the pcm substream instance
* @offset: the buffer offset
@@ -311,7 +393,6 @@
return NULL;
return sgbuf->page_table[idx];
}
-EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
#endif /* CONFIG_SND_DMA_SGBUF */
/**
@@ -327,6 +408,7 @@
*/
int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size)
{
+ struct snd_card *card;
struct snd_pcm_runtime *runtime;
struct snd_dma_buffer *dmab = NULL;
@@ -336,6 +418,7 @@
SNDRV_DMA_TYPE_UNKNOWN))
return -EINVAL;
runtime = substream->runtime;
+ card = substream->pcm->card;
if (runtime->dma_buffer_p) {
/* perphaps, we might free the large DMA memory region
@@ -355,9 +438,10 @@
if (! dmab)
return -ENOMEM;
dmab->dev = substream->dma_buffer.dev;
- if (snd_dma_alloc_pages(substream->dma_buffer.dev.type,
- substream->dma_buffer.dev.dev,
- size, dmab) < 0) {
+ if (do_alloc_pages(card,
+ substream->dma_buffer.dev.type,
+ substream->dma_buffer.dev.dev,
+ size, dmab) < 0) {
kfree(dmab);
return -ENOMEM;
}
@@ -386,8 +470,10 @@
if (runtime->dma_area == NULL)
return 0;
if (runtime->dma_buffer_p != &substream->dma_buffer) {
+ struct snd_card *card = substream->pcm->card;
+
/* it's a newly allocated buffer. release it now. */
- snd_dma_free_pages(runtime->dma_buffer_p);
+ do_free_pages(card, runtime->dma_buffer_p);
kfree(runtime->dma_buffer_p);
}
snd_pcm_set_runtime_buffer(substream, NULL);
@@ -408,7 +494,7 @@
return 0; /* already large enough */
vfree(runtime->dma_area);
}
- runtime->dma_area = __vmalloc(size, gfp_flags, PAGE_KERNEL);
+ runtime->dma_area = __vmalloc(size, gfp_flags);
if (!runtime->dma_area)
return -ENOMEM;
runtime->dma_bytes = size;
--
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