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ALSA: memalloc: Unify x86 SG-buffer handling (take#3) 

This is a second attempt to unify the x86-specific SG-buffer handling
code with the new standard non-contiguous page handler.

The first try (in commit 2d9ea39917) failed due to the wrong page
and address calculations, hence reverted.  (And the second try failed
due to a copy&paste error.)  Now it's corrected with the previous fix
for noncontig pages, and the proper sg page iteration by this patch.

After the migration, SNDRV_DMA_TYPE_DMA_SG becomes identical with
SNDRV_DMA_TYPE_NONCONTIG on x86, while others still fall back to
SNDRV_DMA_TYPE_DEV.

Tested-by: Alex Xu (Hello71) <alex_y_xu@yahoo.ca>
Tested-by: Harald Arnesen <harald@skogtun.org>
Link: https://lore.kernel.org/r/20211017074859.24112-4-tiwai@suse.de
Link: https://lore.kernel.org/r/20211109062235.22310-1-tiwai@suse.de
Link: https://lore.kernel.org/r/20211116073358.19741-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2021-11-16 08:33:58 +01:00
parent 7206998f57
commit 2c95b92ecd
4 changed files with 56 additions and 213 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
include/sound/memalloc.h
View File

@ -36,13 +36,6 @@ struct snd_dma_device {
#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
#define SNDRV_DMA_TYPE_DEV_WC 5 /* continuous write-combined */
#ifdef CONFIG_SND_DMA_SGBUF
#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
#define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */
#else
#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
#define SNDRV_DMA_TYPE_DEV_WC_SG SNDRV_DMA_TYPE_DEV_WC
#endif
#ifdef CONFIG_GENERIC_ALLOCATOR
#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
#else
@ -51,6 +44,13 @@ struct snd_dma_device {
#define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */
#define SNDRV_DMA_TYPE_NONCONTIG 8 /* non-coherent SG buffer */
#define SNDRV_DMA_TYPE_NONCOHERENT 9 /* non-coherent buffer */
#ifdef CONFIG_SND_DMA_SGBUF
#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_NONCONTIG
#define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */
#else
#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
#define SNDRV_DMA_TYPE_DEV_WC_SG SNDRV_DMA_TYPE_DEV_WC
#endif
/*
* info for buffer allocation

1
sound/core/Makefile
View File

@ -19,7 +19,6 @@ snd-$(CONFIG_SND_JACK) += ctljack.o jack.o
snd-pcm-y := pcm.o pcm_native.o pcm_lib.o pcm_misc.o \
pcm_memory.o memalloc.o
snd-pcm-$(CONFIG_SND_PCM_TIMER) += pcm_timer.o
snd-pcm-$(CONFIG_SND_DMA_SGBUF) += sgbuf.o
snd-pcm-$(CONFIG_SND_PCM_ELD) += pcm_drm_eld.o
snd-pcm-$(CONFIG_SND_PCM_IEC958) += pcm_iec958.o

53
sound/core/memalloc.c
View File

@ -620,6 +620,52 @@ static const struct snd_malloc_ops snd_dma_noncontig_ops = {
.get_chunk_size = snd_dma_noncontig_get_chunk_size,
};
/* x86-specific SG-buffer with WC pages */
#ifdef CONFIG_SND_DMA_SGBUF
#define sg_wc_address(it) ((unsigned long)page_address(sg_page_iter_page(it)))
static void *snd_dma_sg_wc_alloc(struct snd_dma_buffer *dmab, size_t size)
{
void *p = snd_dma_noncontig_alloc(dmab, size);
struct sg_table *sgt = dmab->private_data;
struct sg_page_iter iter;
if (!p)
return NULL;
for_each_sgtable_page(sgt, &iter, 0)
set_memory_wc(sg_wc_address(&iter), 1);
return p;
}
static void snd_dma_sg_wc_free(struct snd_dma_buffer *dmab)
{
struct sg_table *sgt = dmab->private_data;
struct sg_page_iter iter;
for_each_sgtable_page(sgt, &iter, 0)
set_memory_wb(sg_wc_address(&iter), 1);
snd_dma_noncontig_free(dmab);
}
static int snd_dma_sg_wc_mmap(struct snd_dma_buffer *dmab,
struct vm_area_struct *area)
{
area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
return dma_mmap_noncontiguous(dmab->dev.dev, area,
dmab->bytes, dmab->private_data);
}
static const struct snd_malloc_ops snd_dma_sg_wc_ops = {
.alloc = snd_dma_sg_wc_alloc,
.free = snd_dma_sg_wc_free,
.mmap = snd_dma_sg_wc_mmap,
.sync = snd_dma_noncontig_sync,
.get_addr = snd_dma_noncontig_get_addr,
.get_page = snd_dma_noncontig_get_page,
.get_chunk_size = snd_dma_noncontig_get_chunk_size,
};
#endif /* CONFIG_SND_DMA_SGBUF */
/*
* Non-coherent pages allocator
*/
@ -679,14 +725,13 @@ static const struct snd_malloc_ops *dma_ops[] = {
[SNDRV_DMA_TYPE_DEV_WC] = &snd_dma_wc_ops,
[SNDRV_DMA_TYPE_NONCONTIG] = &snd_dma_noncontig_ops,
[SNDRV_DMA_TYPE_NONCOHERENT] = &snd_dma_noncoherent_ops,
#ifdef CONFIG_SND_DMA_SGBUF
[SNDRV_DMA_TYPE_DEV_WC_SG] = &snd_dma_sg_wc_ops,
#endif
#ifdef CONFIG_GENERIC_ALLOCATOR
[SNDRV_DMA_TYPE_DEV_IRAM] = &snd_dma_iram_ops,
#endif /* CONFIG_GENERIC_ALLOCATOR */
#endif /* CONFIG_HAS_DMA */
#ifdef CONFIG_SND_DMA_SGBUF
[SNDRV_DMA_TYPE_DEV_SG] = &snd_dma_sg_ops,
[SNDRV_DMA_TYPE_DEV_WC_SG] = &snd_dma_sg_ops,
#endif
};
static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab)

201
sound/core/sgbuf.c
View File

@ -1,201 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Scatter-Gather buffer
*
* Copyright (c) by Takashi Iwai <tiwai@suse.de>
*/
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/export.h>
#include <sound/memalloc.h>
#include "memalloc_local.h"
struct snd_sg_page {
void *buf;
dma_addr_t addr;
};
struct snd_sg_buf {
int size; /* allocated byte size */
int pages; /* allocated pages */
int tblsize; /* allocated table size */
struct snd_sg_page *table; /* address table */
struct page **page_table; /* page table (for vmap/vunmap) */
struct device *dev;
};
/* table entries are align to 32 */
#define SGBUF_TBL_ALIGN 32
#define sgbuf_align_table(tbl) ALIGN((tbl), SGBUF_TBL_ALIGN)
static void snd_dma_sg_free(struct snd_dma_buffer *dmab)
{
struct snd_sg_buf *sgbuf = dmab->private_data;
struct snd_dma_buffer tmpb;
int i;
if (!sgbuf)
return;
vunmap(dmab->area);
dmab->area = NULL;
tmpb.dev.type = SNDRV_DMA_TYPE_DEV;
if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG)
tmpb.dev.type = SNDRV_DMA_TYPE_DEV_WC;
tmpb.dev.dev = sgbuf->dev;
for (i = 0; i < sgbuf->pages; i++) {
if (!(sgbuf->table[i].addr & ~PAGE_MASK))
continue; /* continuous pages */
tmpb.area = sgbuf->table[i].buf;
tmpb.addr = sgbuf->table[i].addr & PAGE_MASK;
tmpb.bytes = (sgbuf->table[i].addr & ~PAGE_MASK) << PAGE_SHIFT;
snd_dma_free_pages(&tmpb);
}
kfree(sgbuf->table);
kfree(sgbuf->page_table);
kfree(sgbuf);
dmab->private_data = NULL;
}
#define MAX_ALLOC_PAGES 32
static void *snd_dma_sg_alloc(struct snd_dma_buffer *dmab, size_t size)
{
struct snd_sg_buf *sgbuf;
unsigned int i, pages, chunk, maxpages;
struct snd_dma_buffer tmpb;
struct snd_sg_page *table;
struct page **pgtable;
int type = SNDRV_DMA_TYPE_DEV;
pgprot_t prot = PAGE_KERNEL;
void *area;
dmab->private_data = sgbuf = kzalloc(sizeof(*sgbuf), GFP_KERNEL);
if (!sgbuf)
return NULL;
if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG) {
type = SNDRV_DMA_TYPE_DEV_WC;
#ifdef pgprot_noncached
prot = pgprot_noncached(PAGE_KERNEL);
#endif
}
sgbuf->dev = dmab->dev.dev;
pages = snd_sgbuf_aligned_pages(size);
sgbuf->tblsize = sgbuf_align_table(pages);
table = kcalloc(sgbuf->tblsize, sizeof(*table), GFP_KERNEL);
if (!table)
goto _failed;
sgbuf->table = table;
pgtable = kcalloc(sgbuf->tblsize, sizeof(*pgtable), GFP_KERNEL);
if (!pgtable)
goto _failed;
sgbuf->page_table = pgtable;
/* allocate pages */
maxpages = MAX_ALLOC_PAGES;
while (pages > 0) {
chunk = pages;
/* don't be too eager to take a huge chunk */
if (chunk > maxpages)
chunk = maxpages;
chunk <<= PAGE_SHIFT;
if (snd_dma_alloc_pages_fallback(type, dmab->dev.dev,
chunk, &tmpb) < 0) {
if (!sgbuf->pages)
goto _failed;
size = sgbuf->pages * PAGE_SIZE;
break;
}
chunk = tmpb.bytes >> PAGE_SHIFT;
for (i = 0; i < chunk; i++) {
table->buf = tmpb.area;
table->addr = tmpb.addr;
if (!i)
table->addr |= chunk; /* mark head */
table++;
*pgtable++ = virt_to_page(tmpb.area);
tmpb.area += PAGE_SIZE;
tmpb.addr += PAGE_SIZE;
}
sgbuf->pages += chunk;
pages -= chunk;
if (chunk < maxpages)
maxpages = chunk;
}
sgbuf->size = size;
area = vmap(sgbuf->page_table, sgbuf->pages, VM_MAP, prot);
if (!area)
goto _failed;
return area;
_failed:
snd_dma_sg_free(dmab); /* free the table */
return NULL;
}
static dma_addr_t snd_dma_sg_get_addr(struct snd_dma_buffer *dmab,
size_t offset)
{
struct snd_sg_buf *sgbuf = dmab->private_data;
dma_addr_t addr;
addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
addr &= ~((dma_addr_t)PAGE_SIZE - 1);
return addr + offset % PAGE_SIZE;
}
static struct page *snd_dma_sg_get_page(struct snd_dma_buffer *dmab,
size_t offset)
{
struct snd_sg_buf *sgbuf = dmab->private_data;
unsigned int idx = offset >> PAGE_SHIFT;
if (idx >= (unsigned int)sgbuf->pages)
return NULL;
return sgbuf->page_table[idx];
}
static unsigned int snd_dma_sg_get_chunk_size(struct snd_dma_buffer *dmab,
unsigned int ofs,
unsigned int size)
{
struct snd_sg_buf *sg = dmab->private_data;
unsigned int start, end, pg;
start = ofs >> PAGE_SHIFT;
end = (ofs + size - 1) >> PAGE_SHIFT;
/* check page continuity */
pg = sg->table[start].addr >> PAGE_SHIFT;
for (;;) {
start++;
if (start > end)
break;
pg++;
if ((sg->table[start].addr >> PAGE_SHIFT) != pg)
return (start << PAGE_SHIFT) - ofs;
}
/* ok, all on continuous pages */
return size;
}
static int snd_dma_sg_mmap(struct snd_dma_buffer *dmab,
struct vm_area_struct *area)
{
if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG)
area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
return -ENOENT; /* continue with the default mmap handler */
}
const struct snd_malloc_ops snd_dma_sg_ops = {
.alloc = snd_dma_sg_alloc,
.free = snd_dma_sg_free,
.get_addr = snd_dma_sg_get_addr,
.get_page = snd_dma_sg_get_page,
.get_chunk_size = snd_dma_sg_get_chunk_size,
.mmap = snd_dma_sg_mmap,
};