ALSA: memalloc: Convert x86 SG-buffer handling with non-contiguous type
We've had an x86-specific SG-buffer handling code, but now it can be merged gracefully with the standard non-contiguous DMA pages. 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. The remaining problem is about the SG-buffer with WC pages: the DMA core stuff on x86 doesn't treat it well, so we still need some special handling to manipulate the page attribute manually. The mmap handler for SNDRV_DMA_TYPE_DEV_SG_WC still returns -ENOENT intentionally for the fallback to the default handler. Link: https://lore.kernel.org/r/20211017074859.24112-4-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
parent
73325f60e2
commit
2d9ea39917
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@ -36,13 +36,6 @@ struct snd_dma_device {
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#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
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#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
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#define SNDRV_DMA_TYPE_DEV_WC 5 /* continuous write-combined */
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#ifdef CONFIG_SND_DMA_SGBUF
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#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
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#define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */
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#else
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#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
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#define SNDRV_DMA_TYPE_DEV_WC_SG SNDRV_DMA_TYPE_DEV_WC
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#endif
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#ifdef CONFIG_GENERIC_ALLOCATOR
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#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
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#else
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@ -51,6 +44,13 @@ struct snd_dma_device {
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#define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */
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#define SNDRV_DMA_TYPE_NONCONTIG 8 /* non-coherent SG buffer */
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#define SNDRV_DMA_TYPE_NONCOHERENT 9 /* non-coherent buffer */
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#ifdef CONFIG_SND_DMA_SGBUF
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#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_NONCONTIG
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#define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */
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#else
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#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
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#define SNDRV_DMA_TYPE_DEV_WC_SG SNDRV_DMA_TYPE_DEV_WC
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#endif
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/*
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* info for buffer allocation
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@ -19,7 +19,6 @@ snd-$(CONFIG_SND_JACK) += ctljack.o jack.o
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snd-pcm-y := pcm.o pcm_native.o pcm_lib.o pcm_misc.o \
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pcm_memory.o memalloc.o
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snd-pcm-$(CONFIG_SND_PCM_TIMER) += pcm_timer.o
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snd-pcm-$(CONFIG_SND_DMA_SGBUF) += sgbuf.o
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snd-pcm-$(CONFIG_SND_PCM_ELD) += pcm_drm_eld.o
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snd-pcm-$(CONFIG_SND_PCM_IEC958) += pcm_iec958.o
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@ -560,6 +560,50 @@ static const struct snd_malloc_ops snd_dma_noncontig_ops = {
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.get_chunk_size = snd_dma_vmalloc_get_chunk_size,
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};
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/* x86-specific SG-buffer with WC pages */
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#ifdef CONFIG_SND_DMA_SGBUF
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#define vmalloc_to_virt(v) (unsigned long)page_to_virt(vmalloc_to_page(v))
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static void *snd_dma_sg_wc_alloc(struct snd_dma_buffer *dmab, size_t size)
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{
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void *p = snd_dma_noncontig_alloc(dmab, size);
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size_t ofs;
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if (!p)
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return NULL;
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for (ofs = 0; ofs < size; ofs += PAGE_SIZE)
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set_memory_uc(vmalloc_to_virt(p + ofs), 1);
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return p;
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}
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static void snd_dma_sg_wc_free(struct snd_dma_buffer *dmab)
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{
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size_t ofs;
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for (ofs = 0; ofs < dmab->bytes; ofs += PAGE_SIZE)
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set_memory_wb(vmalloc_to_virt(dmab->area + ofs), 1);
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snd_dma_noncontig_free(dmab);
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}
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static int snd_dma_sg_wc_mmap(struct snd_dma_buffer *dmab,
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struct vm_area_struct *area)
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{
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area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
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/* FIXME: dma_mmap_noncontiguous() works? */
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return -ENOENT; /* continue with the default mmap handler */
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}
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const struct snd_malloc_ops snd_dma_sg_wc_ops = {
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.alloc = snd_dma_sg_wc_alloc,
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.free = snd_dma_sg_wc_free,
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.mmap = snd_dma_sg_wc_mmap,
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.sync = snd_dma_noncontig_sync,
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.get_addr = snd_dma_vmalloc_get_addr,
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.get_page = snd_dma_vmalloc_get_page,
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.get_chunk_size = snd_dma_vmalloc_get_chunk_size,
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};
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#endif /* CONFIG_SND_DMA_SGBUF */
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/*
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* Non-coherent pages allocator
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*/
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@ -619,14 +663,13 @@ static const struct snd_malloc_ops *dma_ops[] = {
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[SNDRV_DMA_TYPE_DEV_WC] = &snd_dma_wc_ops,
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[SNDRV_DMA_TYPE_NONCONTIG] = &snd_dma_noncontig_ops,
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[SNDRV_DMA_TYPE_NONCOHERENT] = &snd_dma_noncoherent_ops,
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#ifdef CONFIG_SND_DMA_SGBUF
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[SNDRV_DMA_TYPE_DEV_WC_SG] = &snd_dma_sg_wc_ops,
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#endif
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#ifdef CONFIG_GENERIC_ALLOCATOR
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[SNDRV_DMA_TYPE_DEV_IRAM] = &snd_dma_iram_ops,
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#endif /* CONFIG_GENERIC_ALLOCATOR */
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#endif /* CONFIG_HAS_DMA */
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#ifdef CONFIG_SND_DMA_SGBUF
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[SNDRV_DMA_TYPE_DEV_SG] = &snd_dma_sg_ops,
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[SNDRV_DMA_TYPE_DEV_WC_SG] = &snd_dma_sg_ops,
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#endif
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};
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static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab)
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@ -1,201 +0,0 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Scatter-Gather buffer
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*
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* Copyright (c) by Takashi Iwai <tiwai@suse.de>
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*/
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/export.h>
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#include <sound/memalloc.h>
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#include "memalloc_local.h"
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struct snd_sg_page {
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void *buf;
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dma_addr_t addr;
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};
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struct snd_sg_buf {
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int size; /* allocated byte size */
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int pages; /* allocated pages */
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int tblsize; /* allocated table size */
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struct snd_sg_page *table; /* address table */
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struct page **page_table; /* page table (for vmap/vunmap) */
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struct device *dev;
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};
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/* table entries are align to 32 */
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#define SGBUF_TBL_ALIGN 32
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#define sgbuf_align_table(tbl) ALIGN((tbl), SGBUF_TBL_ALIGN)
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static void snd_dma_sg_free(struct snd_dma_buffer *dmab)
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{
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struct snd_sg_buf *sgbuf = dmab->private_data;
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struct snd_dma_buffer tmpb;
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int i;
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if (!sgbuf)
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return;
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vunmap(dmab->area);
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dmab->area = NULL;
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tmpb.dev.type = SNDRV_DMA_TYPE_DEV;
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if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG)
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tmpb.dev.type = SNDRV_DMA_TYPE_DEV_WC;
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tmpb.dev.dev = sgbuf->dev;
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for (i = 0; i < sgbuf->pages; i++) {
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if (!(sgbuf->table[i].addr & ~PAGE_MASK))
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continue; /* continuous pages */
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tmpb.area = sgbuf->table[i].buf;
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tmpb.addr = sgbuf->table[i].addr & PAGE_MASK;
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tmpb.bytes = (sgbuf->table[i].addr & ~PAGE_MASK) << PAGE_SHIFT;
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snd_dma_free_pages(&tmpb);
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}
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kfree(sgbuf->table);
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kfree(sgbuf->page_table);
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kfree(sgbuf);
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dmab->private_data = NULL;
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}
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#define MAX_ALLOC_PAGES 32
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static void *snd_dma_sg_alloc(struct snd_dma_buffer *dmab, size_t size)
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{
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struct snd_sg_buf *sgbuf;
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unsigned int i, pages, chunk, maxpages;
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struct snd_dma_buffer tmpb;
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struct snd_sg_page *table;
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struct page **pgtable;
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int type = SNDRV_DMA_TYPE_DEV;
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pgprot_t prot = PAGE_KERNEL;
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void *area;
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dmab->private_data = sgbuf = kzalloc(sizeof(*sgbuf), GFP_KERNEL);
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if (!sgbuf)
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return NULL;
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if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG) {
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type = SNDRV_DMA_TYPE_DEV_WC;
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#ifdef pgprot_noncached
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prot = pgprot_noncached(PAGE_KERNEL);
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#endif
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}
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sgbuf->dev = dmab->dev.dev;
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pages = snd_sgbuf_aligned_pages(size);
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sgbuf->tblsize = sgbuf_align_table(pages);
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table = kcalloc(sgbuf->tblsize, sizeof(*table), GFP_KERNEL);
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if (!table)
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goto _failed;
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sgbuf->table = table;
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pgtable = kcalloc(sgbuf->tblsize, sizeof(*pgtable), GFP_KERNEL);
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if (!pgtable)
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goto _failed;
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sgbuf->page_table = pgtable;
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/* allocate pages */
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maxpages = MAX_ALLOC_PAGES;
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while (pages > 0) {
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chunk = pages;
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/* don't be too eager to take a huge chunk */
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if (chunk > maxpages)
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chunk = maxpages;
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chunk <<= PAGE_SHIFT;
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if (snd_dma_alloc_pages_fallback(type, dmab->dev.dev,
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chunk, &tmpb) < 0) {
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if (!sgbuf->pages)
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goto _failed;
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size = sgbuf->pages * PAGE_SIZE;
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break;
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}
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chunk = tmpb.bytes >> PAGE_SHIFT;
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for (i = 0; i < chunk; i++) {
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table->buf = tmpb.area;
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table->addr = tmpb.addr;
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if (!i)
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table->addr |= chunk; /* mark head */
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table++;
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*pgtable++ = virt_to_page(tmpb.area);
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tmpb.area += PAGE_SIZE;
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tmpb.addr += PAGE_SIZE;
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}
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sgbuf->pages += chunk;
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pages -= chunk;
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if (chunk < maxpages)
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maxpages = chunk;
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}
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sgbuf->size = size;
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area = vmap(sgbuf->page_table, sgbuf->pages, VM_MAP, prot);
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if (!area)
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goto _failed;
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return area;
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_failed:
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snd_dma_sg_free(dmab); /* free the table */
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return NULL;
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}
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static dma_addr_t snd_dma_sg_get_addr(struct snd_dma_buffer *dmab,
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size_t offset)
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{
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struct snd_sg_buf *sgbuf = dmab->private_data;
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dma_addr_t addr;
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addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
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addr &= ~((dma_addr_t)PAGE_SIZE - 1);
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return addr + offset % PAGE_SIZE;
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}
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static struct page *snd_dma_sg_get_page(struct snd_dma_buffer *dmab,
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size_t offset)
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{
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struct snd_sg_buf *sgbuf = dmab->private_data;
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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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static unsigned int snd_dma_sg_get_chunk_size(struct snd_dma_buffer *dmab,
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unsigned int ofs,
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unsigned int size)
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{
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struct snd_sg_buf *sg = dmab->private_data;
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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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static int snd_dma_sg_mmap(struct snd_dma_buffer *dmab,
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struct vm_area_struct *area)
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{
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if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG)
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area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
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return -ENOENT; /* continue with the default mmap handler */
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}
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const struct snd_malloc_ops snd_dma_sg_ops = {
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.alloc = snd_dma_sg_alloc,
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.free = snd_dma_sg_free,
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.get_addr = snd_dma_sg_get_addr,
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.get_page = snd_dma_sg_get_page,
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.get_chunk_size = snd_dma_sg_get_chunk_size,
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.mmap = snd_dma_sg_mmap,
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};
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