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![Takashi Iwai](/assets/img/avatar_default.png)
Most hardwares have limited buffer-descriptor table length. This also restricts the max buffer size of the sound driver. For example, snd-hda-intel has 1MB buffer size limit, and this is because it can have at most 256 BDL entries. For supporting larger buffers, we need to allocate larger pages even for sg-buffers. This patch changes the sgbuf allocation code to try to allocate larger pages first. At each head of the allocated pages, the number of allocated pages is stored in the lowest bits of the corresponding entry of the table addr field. This change isn't visible as long as the driver uses snd_sgbuf_get_addr() helper. Also, the patch adds a new function, snd_pcm_sgbuf_get_chunk_size(). This returns the size of the chunk on continuous pages starting at the given position offset. If the chunk reaches to a non-continuous page, it returns the size to the boundary. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
434 lines
13 KiB
C
434 lines
13 KiB
C
/*
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* Digital Audio (PCM) abstract layer
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <asm/io.h>
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#include <linux/time.h>
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#include <linux/init.h>
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#include <linux/moduleparam.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/info.h>
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#include <sound/initval.h>
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static int preallocate_dma = 1;
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module_param(preallocate_dma, int, 0444);
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MODULE_PARM_DESC(preallocate_dma, "Preallocate DMA memory when the PCM devices are initialized.");
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static int maximum_substreams = 4;
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module_param(maximum_substreams, int, 0444);
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MODULE_PARM_DESC(maximum_substreams, "Maximum substreams with preallocated DMA memory.");
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static const size_t snd_minimum_buffer = 16384;
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/*
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* try to allocate as the large pages as possible.
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* stores the resultant memory size in *res_size.
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*
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* the minimum size is snd_minimum_buffer. it should be power of 2.
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*/
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static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t size)
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{
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struct snd_dma_buffer *dmab = &substream->dma_buffer;
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int err;
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/* already reserved? */
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if (snd_dma_get_reserved_buf(dmab, substream->dma_buf_id) > 0) {
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if (dmab->bytes >= size)
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return 0; /* yes */
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/* no, free the reserved block */
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snd_dma_free_pages(dmab);
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dmab->bytes = 0;
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}
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do {
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if ((err = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev,
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size, dmab)) < 0) {
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if (err != -ENOMEM)
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return err; /* fatal error */
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} else
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return 0;
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size >>= 1;
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} while (size >= snd_minimum_buffer);
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dmab->bytes = 0; /* tell error */
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return 0;
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}
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/*
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* release the preallocated buffer if not yet done.
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*/
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static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream)
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{
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if (substream->dma_buffer.area == NULL)
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return;
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if (substream->dma_buf_id)
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snd_dma_reserve_buf(&substream->dma_buffer, substream->dma_buf_id);
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else
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snd_dma_free_pages(&substream->dma_buffer);
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substream->dma_buffer.area = NULL;
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}
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/**
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* snd_pcm_lib_preallocate_free - release the preallocated buffer of the specified substream.
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* @substream: the pcm substream instance
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*
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* Releases the pre-allocated buffer of the given substream.
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*
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* Returns zero if successful, or a negative error code on failure.
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*/
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int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream)
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{
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snd_pcm_lib_preallocate_dma_free(substream);
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#ifdef CONFIG_SND_VERBOSE_PROCFS
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snd_info_free_entry(substream->proc_prealloc_max_entry);
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substream->proc_prealloc_max_entry = NULL;
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snd_info_free_entry(substream->proc_prealloc_entry);
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substream->proc_prealloc_entry = NULL;
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#endif
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return 0;
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}
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/**
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* snd_pcm_lib_preallocate_free_for_all - release all pre-allocated buffers on the pcm
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* @pcm: the pcm instance
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*
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* Releases all the pre-allocated buffers on the given pcm.
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*
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* Returns zero if successful, or a negative error code on failure.
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*/
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int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *substream;
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int stream;
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for (stream = 0; stream < 2; stream++)
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for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
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snd_pcm_lib_preallocate_free(substream);
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return 0;
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}
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EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all);
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#ifdef CONFIG_SND_VERBOSE_PROCFS
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/*
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* read callback for prealloc proc file
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*
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* prints the current allocated size in kB.
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*/
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static void snd_pcm_lib_preallocate_proc_read(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer)
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{
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struct snd_pcm_substream *substream = entry->private_data;
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snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_buffer.bytes / 1024);
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}
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/*
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* read callback for prealloc_max proc file
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*
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* prints the maximum allowed size in kB.
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*/
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static void snd_pcm_lib_preallocate_max_proc_read(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer)
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{
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struct snd_pcm_substream *substream = entry->private_data;
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snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_max / 1024);
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}
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/*
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* write callback for prealloc proc file
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*
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* accepts the preallocation size in kB.
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*/
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static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer)
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{
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struct snd_pcm_substream *substream = entry->private_data;
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char line[64], str[64];
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size_t size;
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struct snd_dma_buffer new_dmab;
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if (substream->runtime) {
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buffer->error = -EBUSY;
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return;
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}
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if (!snd_info_get_line(buffer, line, sizeof(line))) {
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snd_info_get_str(str, line, sizeof(str));
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size = simple_strtoul(str, NULL, 10) * 1024;
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if ((size != 0 && size < 8192) || size > substream->dma_max) {
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buffer->error = -EINVAL;
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return;
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}
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if (substream->dma_buffer.bytes == size)
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return;
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memset(&new_dmab, 0, sizeof(new_dmab));
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new_dmab.dev = substream->dma_buffer.dev;
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if (size > 0) {
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if (snd_dma_alloc_pages(substream->dma_buffer.dev.type,
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substream->dma_buffer.dev.dev,
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size, &new_dmab) < 0) {
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buffer->error = -ENOMEM;
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return;
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}
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substream->buffer_bytes_max = size;
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} else {
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substream->buffer_bytes_max = UINT_MAX;
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}
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if (substream->dma_buffer.area)
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snd_dma_free_pages(&substream->dma_buffer);
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substream->dma_buffer = new_dmab;
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} else {
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buffer->error = -EINVAL;
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}
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}
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static inline void preallocate_info_init(struct snd_pcm_substream *substream)
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{
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struct snd_info_entry *entry;
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if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc", substream->proc_root)) != NULL) {
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entry->c.text.read = snd_pcm_lib_preallocate_proc_read;
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entry->c.text.write = snd_pcm_lib_preallocate_proc_write;
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entry->mode |= S_IWUSR;
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entry->private_data = substream;
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if (snd_info_register(entry) < 0) {
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snd_info_free_entry(entry);
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entry = NULL;
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}
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}
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substream->proc_prealloc_entry = entry;
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if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc_max", substream->proc_root)) != NULL) {
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entry->c.text.read = snd_pcm_lib_preallocate_max_proc_read;
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entry->private_data = substream;
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if (snd_info_register(entry) < 0) {
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snd_info_free_entry(entry);
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entry = NULL;
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}
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}
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substream->proc_prealloc_max_entry = entry;
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}
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#else /* !CONFIG_SND_VERBOSE_PROCFS */
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#define preallocate_info_init(s)
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#endif /* CONFIG_SND_VERBOSE_PROCFS */
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/*
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* pre-allocate the buffer and create a proc file for the substream
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*/
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static int snd_pcm_lib_preallocate_pages1(struct snd_pcm_substream *substream,
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size_t size, size_t max)
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{
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if (size > 0 && preallocate_dma && substream->number < maximum_substreams)
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preallocate_pcm_pages(substream, size);
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if (substream->dma_buffer.bytes > 0)
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substream->buffer_bytes_max = substream->dma_buffer.bytes;
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substream->dma_max = max;
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preallocate_info_init(substream);
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return 0;
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}
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/**
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* snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type
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* @substream: the pcm substream instance
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* @type: DMA type (SNDRV_DMA_TYPE_*)
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* @data: DMA type dependant data
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* @size: the requested pre-allocation size in bytes
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* @max: the max. allowed pre-allocation size
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*
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* Do pre-allocation for the given DMA buffer type.
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*
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* When substream->dma_buf_id is set, the function tries to look for
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* the reserved buffer, and the buffer is not freed but reserved at
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* destruction time. The dma_buf_id must be unique for all systems
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* (in the same DMA buffer type) e.g. using snd_dma_pci_buf_id().
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*
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* Returns zero if successful, or a negative error code on failure.
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*/
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int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
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int type, struct device *data,
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size_t size, size_t max)
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{
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substream->dma_buffer.dev.type = type;
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substream->dma_buffer.dev.dev = data;
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return snd_pcm_lib_preallocate_pages1(substream, size, max);
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}
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EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages);
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/**
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* snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continous memory type (all substreams)
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* @pcm: the pcm instance
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* @type: DMA type (SNDRV_DMA_TYPE_*)
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* @data: DMA type dependant data
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* @size: the requested pre-allocation size in bytes
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* @max: the max. allowed pre-allocation size
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*
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* Do pre-allocation to all substreams of the given pcm for the
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* specified DMA type.
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*
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* Returns zero if successful, or a negative error code on failure.
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*/
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int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
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int type, void *data,
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size_t size, size_t max)
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{
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struct snd_pcm_substream *substream;
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int stream, err;
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for (stream = 0; stream < 2; stream++)
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for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
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if ((err = snd_pcm_lib_preallocate_pages(substream, type, data, size, max)) < 0)
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return err;
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return 0;
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}
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EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all);
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/**
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* snd_pcm_sgbuf_ops_page - get the page struct at the given offset
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* @substream: the pcm substream instance
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* @offset: the buffer offset
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*
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* Returns the page struct at the given buffer offset.
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* Used as the page callback of PCM ops.
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*/
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struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset)
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{
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struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);
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unsigned int idx = offset >> PAGE_SHIFT;
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if (idx >= (unsigned int)sgbuf->pages)
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return NULL;
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return sgbuf->page_table[idx];
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}
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EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
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/*
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* compute the max chunk size with continuous pages on sg-buffer
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*/
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unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
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unsigned int ofs, unsigned int size)
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{
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struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
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unsigned int start, end, pg;
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start = ofs >> PAGE_SHIFT;
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end = (ofs + size - 1) >> PAGE_SHIFT;
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/* check page continuity */
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pg = sg->table[start].addr >> PAGE_SHIFT;
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for (;;) {
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start++;
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if (start > end)
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break;
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pg++;
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if ((sg->table[start].addr >> PAGE_SHIFT) != pg)
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return (start << PAGE_SHIFT) - ofs;
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}
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/* ok, all on continuous pages */
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return size;
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}
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EXPORT_SYMBOL(snd_pcm_sgbuf_get_chunk_size);
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/**
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* snd_pcm_lib_malloc_pages - allocate the DMA buffer
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* @substream: the substream to allocate the DMA buffer to
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* @size: the requested buffer size in bytes
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*
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* Allocates the DMA buffer on the BUS type given earlier to
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* snd_pcm_lib_preallocate_xxx_pages().
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*
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* Returns 1 if the buffer is changed, 0 if not changed, or a negative
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* code on failure.
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*/
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int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size)
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{
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struct snd_pcm_runtime *runtime;
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struct snd_dma_buffer *dmab = NULL;
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if (PCM_RUNTIME_CHECK(substream))
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return -EINVAL;
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if (snd_BUG_ON(substream->dma_buffer.dev.type ==
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SNDRV_DMA_TYPE_UNKNOWN))
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return -EINVAL;
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runtime = substream->runtime;
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if (runtime->dma_buffer_p) {
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/* perphaps, we might free the large DMA memory region
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to save some space here, but the actual solution
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costs us less time */
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if (runtime->dma_buffer_p->bytes >= size) {
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runtime->dma_bytes = size;
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return 0; /* ok, do not change */
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}
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snd_pcm_lib_free_pages(substream);
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}
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if (substream->dma_buffer.area != NULL &&
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substream->dma_buffer.bytes >= size) {
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dmab = &substream->dma_buffer; /* use the pre-allocated buffer */
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} else {
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dmab = kzalloc(sizeof(*dmab), GFP_KERNEL);
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if (! dmab)
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return -ENOMEM;
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dmab->dev = substream->dma_buffer.dev;
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if (snd_dma_alloc_pages(substream->dma_buffer.dev.type,
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substream->dma_buffer.dev.dev,
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size, dmab) < 0) {
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kfree(dmab);
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return -ENOMEM;
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}
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}
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snd_pcm_set_runtime_buffer(substream, dmab);
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runtime->dma_bytes = size;
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return 1; /* area was changed */
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}
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EXPORT_SYMBOL(snd_pcm_lib_malloc_pages);
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/**
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* snd_pcm_lib_free_pages - release the allocated DMA buffer.
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* @substream: the substream to release the DMA buffer
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*
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* Releases the DMA buffer allocated via snd_pcm_lib_malloc_pages().
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*
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* Returns zero if successful, or a negative error code on failure.
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*/
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int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime;
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if (PCM_RUNTIME_CHECK(substream))
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return -EINVAL;
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runtime = substream->runtime;
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if (runtime->dma_area == NULL)
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return 0;
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if (runtime->dma_buffer_p != &substream->dma_buffer) {
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/* it's a newly allocated buffer. release it now. */
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snd_dma_free_pages(runtime->dma_buffer_p);
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kfree(runtime->dma_buffer_p);
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}
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snd_pcm_set_runtime_buffer(substream, NULL);
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return 0;
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}
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EXPORT_SYMBOL(snd_pcm_lib_free_pages);
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