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![Takashi Iwai](/assets/img/avatar_default.png)
We change recently the memalloc helper to use dma_alloc_noncontiguous() and the fallback to get_pages(). Although lots of issues with IOMMU (or non-IOMMU) have been addressed, but there seems still a regression on Xen PV. Interestingly, the only proper way to work is use dma_alloc_coherent(). The use of dma_alloc_coherent() for SG buffer was dropped as it's problematic on IOMMU systems. OTOH, Xen PV has a different way, and it's fine to use the dma_alloc_coherent(). This patch is a workaround for Xen PV. It consists of the following changes: - For Xen PV, use only the fallback allocation without dma_alloc_noncontiguous() - In the fallback allocation, use dma_alloc_coherent(); the DMA address from dma_alloc_coherent() is returned in get_addr ops - The DMA addresses are stored in an array; the first entry stores the number of allocated pages in lower bits, which are referred at releasing pages again Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Fixes:a8d302a0b7
("ALSA: memalloc: Revive x86-specific WC page allocations again") Fixes:9736a32513
("ALSA: memalloc: Don't fall back for SG-buffer with IOMMU") Link: https://lore.kernel.org/r/87tu256lqs.wl-tiwai@suse.de Link: https://lore.kernel.org/r/20230125153104.5527-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
950 lines
25 KiB
C
950 lines
25 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Takashi Iwai <tiwai@suse.de>
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*
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* Generic memory allocators
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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/dma-mapping.h>
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#include <linux/dma-map-ops.h>
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#include <linux/genalloc.h>
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#include <linux/highmem.h>
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#include <linux/vmalloc.h>
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#ifdef CONFIG_X86
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#include <asm/set_memory.h>
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#endif
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#include <sound/memalloc.h>
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#include "memalloc_local.h"
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#define DEFAULT_GFP \
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(GFP_KERNEL | \
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__GFP_RETRY_MAYFAIL | /* don't trigger OOM-killer */ \
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__GFP_NOWARN) /* no stack trace print - this call is non-critical */
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static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab);
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#ifdef CONFIG_SND_DMA_SGBUF
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static void *snd_dma_sg_fallback_alloc(struct snd_dma_buffer *dmab, size_t size);
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#endif
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static void *__snd_dma_alloc_pages(struct snd_dma_buffer *dmab, size_t size)
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{
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
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if (WARN_ON_ONCE(!ops || !ops->alloc))
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return NULL;
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return ops->alloc(dmab, size);
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}
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/**
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* snd_dma_alloc_dir_pages - allocate the buffer area according to the given
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* type and direction
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* @type: the DMA buffer type
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* @device: the device pointer
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* @dir: DMA direction
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* @size: the buffer size to allocate
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* @dmab: buffer allocation record to store the allocated data
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*
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* Calls the memory-allocator function for the corresponding
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* buffer type.
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*
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* Return: Zero if the buffer with the given size is allocated successfully,
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* otherwise a negative value on error.
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*/
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int snd_dma_alloc_dir_pages(int type, struct device *device,
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enum dma_data_direction dir, size_t size,
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struct snd_dma_buffer *dmab)
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{
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if (WARN_ON(!size))
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return -ENXIO;
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if (WARN_ON(!dmab))
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return -ENXIO;
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size = PAGE_ALIGN(size);
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dmab->dev.type = type;
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dmab->dev.dev = device;
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dmab->dev.dir = dir;
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dmab->bytes = 0;
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dmab->addr = 0;
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dmab->private_data = NULL;
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dmab->area = __snd_dma_alloc_pages(dmab, size);
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if (!dmab->area)
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return -ENOMEM;
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dmab->bytes = size;
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return 0;
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}
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EXPORT_SYMBOL(snd_dma_alloc_dir_pages);
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/**
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* snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
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* @type: the DMA buffer type
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* @device: the device pointer
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* @size: the buffer size to allocate
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* @dmab: buffer allocation record to store the allocated data
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*
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* Calls the memory-allocator function for the corresponding
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* buffer type. When no space is left, this function reduces the size and
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* tries to allocate again. The size actually allocated is stored in
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* res_size argument.
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*
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* Return: Zero if the buffer with the given size is allocated successfully,
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* otherwise a negative value on error.
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*/
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int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
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struct snd_dma_buffer *dmab)
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{
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int err;
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while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
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if (err != -ENOMEM)
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return err;
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if (size <= PAGE_SIZE)
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return -ENOMEM;
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size >>= 1;
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size = PAGE_SIZE << get_order(size);
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}
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if (! dmab->area)
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return -ENOMEM;
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return 0;
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}
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EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
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/**
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* snd_dma_free_pages - release the allocated buffer
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* @dmab: the buffer allocation record to release
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*
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* Releases the allocated buffer via snd_dma_alloc_pages().
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*/
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void snd_dma_free_pages(struct snd_dma_buffer *dmab)
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{
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
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if (ops && ops->free)
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ops->free(dmab);
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}
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EXPORT_SYMBOL(snd_dma_free_pages);
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/* called by devres */
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static void __snd_release_pages(struct device *dev, void *res)
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{
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snd_dma_free_pages(res);
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}
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/**
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* snd_devm_alloc_dir_pages - allocate the buffer and manage with devres
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* @dev: the device pointer
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* @type: the DMA buffer type
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* @dir: DMA direction
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* @size: the buffer size to allocate
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*
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* Allocate buffer pages depending on the given type and manage using devres.
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* The pages will be released automatically at the device removal.
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*
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* Unlike snd_dma_alloc_pages(), this function requires the real device pointer,
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* hence it can't work with SNDRV_DMA_TYPE_CONTINUOUS or
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* SNDRV_DMA_TYPE_VMALLOC type.
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*
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* Return: the snd_dma_buffer object at success, or NULL if failed
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*/
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struct snd_dma_buffer *
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snd_devm_alloc_dir_pages(struct device *dev, int type,
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enum dma_data_direction dir, size_t size)
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{
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struct snd_dma_buffer *dmab;
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int err;
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if (WARN_ON(type == SNDRV_DMA_TYPE_CONTINUOUS ||
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type == SNDRV_DMA_TYPE_VMALLOC))
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return NULL;
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dmab = devres_alloc(__snd_release_pages, sizeof(*dmab), GFP_KERNEL);
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if (!dmab)
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return NULL;
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err = snd_dma_alloc_dir_pages(type, dev, dir, size, dmab);
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if (err < 0) {
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devres_free(dmab);
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return NULL;
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}
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devres_add(dev, dmab);
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return dmab;
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}
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EXPORT_SYMBOL_GPL(snd_devm_alloc_dir_pages);
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/**
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* snd_dma_buffer_mmap - perform mmap of the given DMA buffer
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* @dmab: buffer allocation information
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* @area: VM area information
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*
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* Return: zero if successful, or a negative error code
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*/
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int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
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struct vm_area_struct *area)
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{
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const struct snd_malloc_ops *ops;
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if (!dmab)
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return -ENOENT;
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ops = snd_dma_get_ops(dmab);
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if (ops && ops->mmap)
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return ops->mmap(dmab, area);
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else
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return -ENOENT;
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}
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EXPORT_SYMBOL(snd_dma_buffer_mmap);
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#ifdef CONFIG_HAS_DMA
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/**
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* snd_dma_buffer_sync - sync DMA buffer between CPU and device
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* @dmab: buffer allocation information
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* @mode: sync mode
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*/
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void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,
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enum snd_dma_sync_mode mode)
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{
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const struct snd_malloc_ops *ops;
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if (!dmab || !dmab->dev.need_sync)
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return;
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ops = snd_dma_get_ops(dmab);
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if (ops && ops->sync)
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ops->sync(dmab, mode);
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}
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EXPORT_SYMBOL_GPL(snd_dma_buffer_sync);
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#endif /* CONFIG_HAS_DMA */
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/**
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* snd_sgbuf_get_addr - return the physical address at the corresponding offset
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* @dmab: buffer allocation information
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* @offset: offset in the ring buffer
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*
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* Return: the physical address
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*/
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dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset)
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{
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
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if (ops && ops->get_addr)
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return ops->get_addr(dmab, offset);
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else
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return dmab->addr + offset;
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}
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EXPORT_SYMBOL(snd_sgbuf_get_addr);
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/**
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* snd_sgbuf_get_page - return the physical page at the corresponding offset
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* @dmab: buffer allocation information
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* @offset: offset in the ring buffer
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*
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* Return: the page pointer
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*/
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struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset)
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{
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
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if (ops && ops->get_page)
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return ops->get_page(dmab, offset);
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else
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return virt_to_page(dmab->area + offset);
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}
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EXPORT_SYMBOL(snd_sgbuf_get_page);
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/**
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* snd_sgbuf_get_chunk_size - compute the max chunk size with continuous pages
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* on sg-buffer
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* @dmab: buffer allocation information
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* @ofs: offset in the ring buffer
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* @size: the requested size
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*
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* Return: the chunk size
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*/
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unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
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unsigned int ofs, unsigned int size)
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{
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
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if (ops && ops->get_chunk_size)
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return ops->get_chunk_size(dmab, ofs, size);
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else
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return size;
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}
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EXPORT_SYMBOL(snd_sgbuf_get_chunk_size);
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/*
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* Continuous pages allocator
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*/
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static void *do_alloc_pages(struct device *dev, size_t size, dma_addr_t *addr,
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bool wc)
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{
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void *p;
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gfp_t gfp = GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN;
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again:
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p = alloc_pages_exact(size, gfp);
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if (!p)
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return NULL;
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*addr = page_to_phys(virt_to_page(p));
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if (!dev)
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return p;
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if ((*addr + size - 1) & ~dev->coherent_dma_mask) {
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if (IS_ENABLED(CONFIG_ZONE_DMA32) && !(gfp & GFP_DMA32)) {
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gfp |= GFP_DMA32;
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goto again;
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}
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if (IS_ENABLED(CONFIG_ZONE_DMA) && !(gfp & GFP_DMA)) {
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gfp = (gfp & ~GFP_DMA32) | GFP_DMA;
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goto again;
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}
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}
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#ifdef CONFIG_X86
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if (wc)
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set_memory_wc((unsigned long)(p), size >> PAGE_SHIFT);
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#endif
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return p;
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}
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static void do_free_pages(void *p, size_t size, bool wc)
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{
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#ifdef CONFIG_X86
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if (wc)
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set_memory_wb((unsigned long)(p), size >> PAGE_SHIFT);
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#endif
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free_pages_exact(p, size);
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}
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static void *snd_dma_continuous_alloc(struct snd_dma_buffer *dmab, size_t size)
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{
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return do_alloc_pages(dmab->dev.dev, size, &dmab->addr, false);
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}
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static void snd_dma_continuous_free(struct snd_dma_buffer *dmab)
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{
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do_free_pages(dmab->area, dmab->bytes, false);
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}
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static int snd_dma_continuous_mmap(struct snd_dma_buffer *dmab,
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struct vm_area_struct *area)
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{
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return remap_pfn_range(area, area->vm_start,
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dmab->addr >> PAGE_SHIFT,
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area->vm_end - area->vm_start,
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area->vm_page_prot);
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}
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static const struct snd_malloc_ops snd_dma_continuous_ops = {
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.alloc = snd_dma_continuous_alloc,
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.free = snd_dma_continuous_free,
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.mmap = snd_dma_continuous_mmap,
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};
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/*
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* VMALLOC allocator
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*/
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static void *snd_dma_vmalloc_alloc(struct snd_dma_buffer *dmab, size_t size)
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{
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return vmalloc(size);
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}
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static void snd_dma_vmalloc_free(struct snd_dma_buffer *dmab)
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{
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vfree(dmab->area);
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}
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static int snd_dma_vmalloc_mmap(struct snd_dma_buffer *dmab,
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struct vm_area_struct *area)
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{
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return remap_vmalloc_range(area, dmab->area, 0);
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}
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#define get_vmalloc_page_addr(dmab, offset) \
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page_to_phys(vmalloc_to_page((dmab)->area + (offset)))
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static dma_addr_t snd_dma_vmalloc_get_addr(struct snd_dma_buffer *dmab,
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size_t offset)
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{
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return get_vmalloc_page_addr(dmab, offset) + offset % PAGE_SIZE;
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}
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static struct page *snd_dma_vmalloc_get_page(struct snd_dma_buffer *dmab,
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size_t offset)
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{
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return vmalloc_to_page(dmab->area + offset);
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}
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static unsigned int
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snd_dma_vmalloc_get_chunk_size(struct snd_dma_buffer *dmab,
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unsigned int ofs, unsigned int size)
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{
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unsigned int start, end;
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unsigned long addr;
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start = ALIGN_DOWN(ofs, PAGE_SIZE);
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end = ofs + size - 1; /* the last byte address */
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/* check page continuity */
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addr = get_vmalloc_page_addr(dmab, start);
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for (;;) {
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start += PAGE_SIZE;
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if (start > end)
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break;
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addr += PAGE_SIZE;
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if (get_vmalloc_page_addr(dmab, start) != addr)
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return start - 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 const struct snd_malloc_ops snd_dma_vmalloc_ops = {
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.alloc = snd_dma_vmalloc_alloc,
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.free = snd_dma_vmalloc_free,
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.mmap = snd_dma_vmalloc_mmap,
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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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#ifdef CONFIG_HAS_DMA
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/*
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* IRAM allocator
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*/
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#ifdef CONFIG_GENERIC_ALLOCATOR
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static void *snd_dma_iram_alloc(struct snd_dma_buffer *dmab, size_t size)
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{
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struct device *dev = dmab->dev.dev;
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struct gen_pool *pool;
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void *p;
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if (dev->of_node) {
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pool = of_gen_pool_get(dev->of_node, "iram", 0);
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/* Assign the pool into private_data field */
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dmab->private_data = pool;
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p = gen_pool_dma_alloc_align(pool, size, &dmab->addr, PAGE_SIZE);
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if (p)
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return p;
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}
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/* Internal memory might have limited size and no enough space,
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* so if we fail to malloc, try to fetch memory traditionally.
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*/
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dmab->dev.type = SNDRV_DMA_TYPE_DEV;
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return __snd_dma_alloc_pages(dmab, size);
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}
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static void snd_dma_iram_free(struct snd_dma_buffer *dmab)
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{
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struct gen_pool *pool = dmab->private_data;
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if (pool && dmab->area)
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gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
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}
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static int snd_dma_iram_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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return remap_pfn_range(area, area->vm_start,
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dmab->addr >> PAGE_SHIFT,
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area->vm_end - area->vm_start,
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area->vm_page_prot);
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}
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static const struct snd_malloc_ops snd_dma_iram_ops = {
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.alloc = snd_dma_iram_alloc,
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.free = snd_dma_iram_free,
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.mmap = snd_dma_iram_mmap,
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};
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#endif /* CONFIG_GENERIC_ALLOCATOR */
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/*
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* Coherent device pages allocator
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*/
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static void *snd_dma_dev_alloc(struct snd_dma_buffer *dmab, size_t size)
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{
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return dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP);
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}
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static void snd_dma_dev_free(struct snd_dma_buffer *dmab)
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{
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dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
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}
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static int snd_dma_dev_mmap(struct snd_dma_buffer *dmab,
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struct vm_area_struct *area)
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{
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return dma_mmap_coherent(dmab->dev.dev, area,
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dmab->area, dmab->addr, dmab->bytes);
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}
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|
static const struct snd_malloc_ops snd_dma_dev_ops = {
|
|
.alloc = snd_dma_dev_alloc,
|
|
.free = snd_dma_dev_free,
|
|
.mmap = snd_dma_dev_mmap,
|
|
};
|
|
|
|
/*
|
|
* Write-combined pages
|
|
*/
|
|
/* x86-specific allocations */
|
|
#ifdef CONFIG_SND_DMA_SGBUF
|
|
static void *snd_dma_wc_alloc(struct snd_dma_buffer *dmab, size_t size)
|
|
{
|
|
return do_alloc_pages(dmab->dev.dev, size, &dmab->addr, true);
|
|
}
|
|
|
|
static void snd_dma_wc_free(struct snd_dma_buffer *dmab)
|
|
{
|
|
do_free_pages(dmab->area, dmab->bytes, true);
|
|
}
|
|
|
|
static int snd_dma_wc_mmap(struct snd_dma_buffer *dmab,
|
|
struct vm_area_struct *area)
|
|
{
|
|
area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
|
|
return snd_dma_continuous_mmap(dmab, area);
|
|
}
|
|
#else
|
|
static void *snd_dma_wc_alloc(struct snd_dma_buffer *dmab, size_t size)
|
|
{
|
|
return dma_alloc_wc(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP);
|
|
}
|
|
|
|
static void snd_dma_wc_free(struct snd_dma_buffer *dmab)
|
|
{
|
|
dma_free_wc(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
|
|
}
|
|
|
|
static int snd_dma_wc_mmap(struct snd_dma_buffer *dmab,
|
|
struct vm_area_struct *area)
|
|
{
|
|
return dma_mmap_wc(dmab->dev.dev, area,
|
|
dmab->area, dmab->addr, dmab->bytes);
|
|
}
|
|
#endif /* CONFIG_SND_DMA_SGBUF */
|
|
|
|
static const struct snd_malloc_ops snd_dma_wc_ops = {
|
|
.alloc = snd_dma_wc_alloc,
|
|
.free = snd_dma_wc_free,
|
|
.mmap = snd_dma_wc_mmap,
|
|
};
|
|
|
|
/*
|
|
* Non-contiguous pages allocator
|
|
*/
|
|
static void *snd_dma_noncontig_alloc(struct snd_dma_buffer *dmab, size_t size)
|
|
{
|
|
struct sg_table *sgt;
|
|
void *p;
|
|
|
|
#ifdef CONFIG_SND_DMA_SGBUF
|
|
if (cpu_feature_enabled(X86_FEATURE_XENPV))
|
|
return snd_dma_sg_fallback_alloc(dmab, size);
|
|
#endif
|
|
sgt = dma_alloc_noncontiguous(dmab->dev.dev, size, dmab->dev.dir,
|
|
DEFAULT_GFP, 0);
|
|
#ifdef CONFIG_SND_DMA_SGBUF
|
|
if (!sgt && !get_dma_ops(dmab->dev.dev))
|
|
return snd_dma_sg_fallback_alloc(dmab, size);
|
|
#endif
|
|
if (!sgt)
|
|
return NULL;
|
|
|
|
dmab->dev.need_sync = dma_need_sync(dmab->dev.dev,
|
|
sg_dma_address(sgt->sgl));
|
|
p = dma_vmap_noncontiguous(dmab->dev.dev, size, sgt);
|
|
if (p) {
|
|
dmab->private_data = sgt;
|
|
/* store the first page address for convenience */
|
|
dmab->addr = snd_sgbuf_get_addr(dmab, 0);
|
|
} else {
|
|
dma_free_noncontiguous(dmab->dev.dev, size, sgt, dmab->dev.dir);
|
|
}
|
|
return p;
|
|
}
|
|
|
|
static void snd_dma_noncontig_free(struct snd_dma_buffer *dmab)
|
|
{
|
|
dma_vunmap_noncontiguous(dmab->dev.dev, dmab->area);
|
|
dma_free_noncontiguous(dmab->dev.dev, dmab->bytes, dmab->private_data,
|
|
dmab->dev.dir);
|
|
}
|
|
|
|
static int snd_dma_noncontig_mmap(struct snd_dma_buffer *dmab,
|
|
struct vm_area_struct *area)
|
|
{
|
|
return dma_mmap_noncontiguous(dmab->dev.dev, area,
|
|
dmab->bytes, dmab->private_data);
|
|
}
|
|
|
|
static void snd_dma_noncontig_sync(struct snd_dma_buffer *dmab,
|
|
enum snd_dma_sync_mode mode)
|
|
{
|
|
if (mode == SNDRV_DMA_SYNC_CPU) {
|
|
if (dmab->dev.dir == DMA_TO_DEVICE)
|
|
return;
|
|
invalidate_kernel_vmap_range(dmab->area, dmab->bytes);
|
|
dma_sync_sgtable_for_cpu(dmab->dev.dev, dmab->private_data,
|
|
dmab->dev.dir);
|
|
} else {
|
|
if (dmab->dev.dir == DMA_FROM_DEVICE)
|
|
return;
|
|
flush_kernel_vmap_range(dmab->area, dmab->bytes);
|
|
dma_sync_sgtable_for_device(dmab->dev.dev, dmab->private_data,
|
|
dmab->dev.dir);
|
|
}
|
|
}
|
|
|
|
static inline void snd_dma_noncontig_iter_set(struct snd_dma_buffer *dmab,
|
|
struct sg_page_iter *piter,
|
|
size_t offset)
|
|
{
|
|
struct sg_table *sgt = dmab->private_data;
|
|
|
|
__sg_page_iter_start(piter, sgt->sgl, sgt->orig_nents,
|
|
offset >> PAGE_SHIFT);
|
|
}
|
|
|
|
static dma_addr_t snd_dma_noncontig_get_addr(struct snd_dma_buffer *dmab,
|
|
size_t offset)
|
|
{
|
|
struct sg_dma_page_iter iter;
|
|
|
|
snd_dma_noncontig_iter_set(dmab, &iter.base, offset);
|
|
__sg_page_iter_dma_next(&iter);
|
|
return sg_page_iter_dma_address(&iter) + offset % PAGE_SIZE;
|
|
}
|
|
|
|
static struct page *snd_dma_noncontig_get_page(struct snd_dma_buffer *dmab,
|
|
size_t offset)
|
|
{
|
|
struct sg_page_iter iter;
|
|
|
|
snd_dma_noncontig_iter_set(dmab, &iter, offset);
|
|
__sg_page_iter_next(&iter);
|
|
return sg_page_iter_page(&iter);
|
|
}
|
|
|
|
static unsigned int
|
|
snd_dma_noncontig_get_chunk_size(struct snd_dma_buffer *dmab,
|
|
unsigned int ofs, unsigned int size)
|
|
{
|
|
struct sg_dma_page_iter iter;
|
|
unsigned int start, end;
|
|
unsigned long addr;
|
|
|
|
start = ALIGN_DOWN(ofs, PAGE_SIZE);
|
|
end = ofs + size - 1; /* the last byte address */
|
|
snd_dma_noncontig_iter_set(dmab, &iter.base, start);
|
|
if (!__sg_page_iter_dma_next(&iter))
|
|
return 0;
|
|
/* check page continuity */
|
|
addr = sg_page_iter_dma_address(&iter);
|
|
for (;;) {
|
|
start += PAGE_SIZE;
|
|
if (start > end)
|
|
break;
|
|
addr += PAGE_SIZE;
|
|
if (!__sg_page_iter_dma_next(&iter) ||
|
|
sg_page_iter_dma_address(&iter) != addr)
|
|
return start - ofs;
|
|
}
|
|
/* ok, all on continuous pages */
|
|
return size;
|
|
}
|
|
|
|
static const struct snd_malloc_ops snd_dma_noncontig_ops = {
|
|
.alloc = snd_dma_noncontig_alloc,
|
|
.free = snd_dma_noncontig_free,
|
|
.mmap = snd_dma_noncontig_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,
|
|
};
|
|
|
|
/* 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;
|
|
if (dmab->dev.type != SNDRV_DMA_TYPE_DEV_WC_SG)
|
|
return p;
|
|
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,
|
|
};
|
|
|
|
/* Fallback SG-buffer allocations for x86 */
|
|
struct snd_dma_sg_fallback {
|
|
bool use_dma_alloc_coherent;
|
|
size_t count;
|
|
struct page **pages;
|
|
/* DMA address array; the first page contains #pages in ~PAGE_MASK */
|
|
dma_addr_t *addrs;
|
|
};
|
|
|
|
static void __snd_dma_sg_fallback_free(struct snd_dma_buffer *dmab,
|
|
struct snd_dma_sg_fallback *sgbuf)
|
|
{
|
|
size_t i, size;
|
|
|
|
if (sgbuf->pages && sgbuf->addrs) {
|
|
i = 0;
|
|
while (i < sgbuf->count) {
|
|
if (!sgbuf->pages[i] || !sgbuf->addrs[i])
|
|
break;
|
|
size = sgbuf->addrs[i] & ~PAGE_MASK;
|
|
if (WARN_ON(!size))
|
|
break;
|
|
if (sgbuf->use_dma_alloc_coherent)
|
|
dma_free_coherent(dmab->dev.dev, size << PAGE_SHIFT,
|
|
page_address(sgbuf->pages[i]),
|
|
sgbuf->addrs[i] & PAGE_MASK);
|
|
else
|
|
do_free_pages(page_address(sgbuf->pages[i]),
|
|
size << PAGE_SHIFT, false);
|
|
i += size;
|
|
}
|
|
}
|
|
kvfree(sgbuf->pages);
|
|
kvfree(sgbuf->addrs);
|
|
kfree(sgbuf);
|
|
}
|
|
|
|
static void *snd_dma_sg_fallback_alloc(struct snd_dma_buffer *dmab, size_t size)
|
|
{
|
|
struct snd_dma_sg_fallback *sgbuf;
|
|
struct page **pagep, *curp;
|
|
size_t chunk, npages;
|
|
dma_addr_t *addrp;
|
|
dma_addr_t addr;
|
|
void *p;
|
|
|
|
/* correct the type */
|
|
if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_SG)
|
|
dmab->dev.type = SNDRV_DMA_TYPE_DEV_SG_FALLBACK;
|
|
else if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG)
|
|
dmab->dev.type = SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK;
|
|
|
|
sgbuf = kzalloc(sizeof(*sgbuf), GFP_KERNEL);
|
|
if (!sgbuf)
|
|
return NULL;
|
|
sgbuf->use_dma_alloc_coherent = cpu_feature_enabled(X86_FEATURE_XENPV);
|
|
size = PAGE_ALIGN(size);
|
|
sgbuf->count = size >> PAGE_SHIFT;
|
|
sgbuf->pages = kvcalloc(sgbuf->count, sizeof(*sgbuf->pages), GFP_KERNEL);
|
|
sgbuf->addrs = kvcalloc(sgbuf->count, sizeof(*sgbuf->addrs), GFP_KERNEL);
|
|
if (!sgbuf->pages || !sgbuf->addrs)
|
|
goto error;
|
|
|
|
pagep = sgbuf->pages;
|
|
addrp = sgbuf->addrs;
|
|
chunk = (PAGE_SIZE - 1) << PAGE_SHIFT; /* to fit in low bits in addrs */
|
|
while (size > 0) {
|
|
chunk = min(size, chunk);
|
|
if (sgbuf->use_dma_alloc_coherent)
|
|
p = dma_alloc_coherent(dmab->dev.dev, chunk, &addr, DEFAULT_GFP);
|
|
else
|
|
p = do_alloc_pages(dmab->dev.dev, chunk, &addr, false);
|
|
if (!p) {
|
|
if (chunk <= PAGE_SIZE)
|
|
goto error;
|
|
chunk >>= 1;
|
|
chunk = PAGE_SIZE << get_order(chunk);
|
|
continue;
|
|
}
|
|
|
|
size -= chunk;
|
|
/* fill pages */
|
|
npages = chunk >> PAGE_SHIFT;
|
|
*addrp = npages; /* store in lower bits */
|
|
curp = virt_to_page(p);
|
|
while (npages--) {
|
|
*pagep++ = curp++;
|
|
*addrp++ |= addr;
|
|
addr += PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
p = vmap(sgbuf->pages, sgbuf->count, VM_MAP, PAGE_KERNEL);
|
|
if (!p)
|
|
goto error;
|
|
|
|
if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK)
|
|
set_pages_array_wc(sgbuf->pages, sgbuf->count);
|
|
|
|
dmab->private_data = sgbuf;
|
|
/* store the first page address for convenience */
|
|
dmab->addr = sgbuf->addrs[0] & PAGE_MASK;
|
|
return p;
|
|
|
|
error:
|
|
__snd_dma_sg_fallback_free(dmab, sgbuf);
|
|
return NULL;
|
|
}
|
|
|
|
static void snd_dma_sg_fallback_free(struct snd_dma_buffer *dmab)
|
|
{
|
|
struct snd_dma_sg_fallback *sgbuf = dmab->private_data;
|
|
|
|
if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK)
|
|
set_pages_array_wb(sgbuf->pages, sgbuf->count);
|
|
vunmap(dmab->area);
|
|
__snd_dma_sg_fallback_free(dmab, dmab->private_data);
|
|
}
|
|
|
|
static dma_addr_t snd_dma_sg_fallback_get_addr(struct snd_dma_buffer *dmab,
|
|
size_t offset)
|
|
{
|
|
struct snd_dma_sg_fallback *sgbuf = dmab->private_data;
|
|
size_t index = offset >> PAGE_SHIFT;
|
|
|
|
return (sgbuf->addrs[index] & PAGE_MASK) | (offset & ~PAGE_MASK);
|
|
}
|
|
|
|
static int snd_dma_sg_fallback_mmap(struct snd_dma_buffer *dmab,
|
|
struct vm_area_struct *area)
|
|
{
|
|
struct snd_dma_sg_fallback *sgbuf = dmab->private_data;
|
|
|
|
if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK)
|
|
area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
|
|
return vm_map_pages(area, sgbuf->pages, sgbuf->count);
|
|
}
|
|
|
|
static const struct snd_malloc_ops snd_dma_sg_fallback_ops = {
|
|
.alloc = snd_dma_sg_fallback_alloc,
|
|
.free = snd_dma_sg_fallback_free,
|
|
.mmap = snd_dma_sg_fallback_mmap,
|
|
.get_addr = snd_dma_sg_fallback_get_addr,
|
|
/* reuse vmalloc helpers */
|
|
.get_page = snd_dma_vmalloc_get_page,
|
|
.get_chunk_size = snd_dma_vmalloc_get_chunk_size,
|
|
};
|
|
#endif /* CONFIG_SND_DMA_SGBUF */
|
|
|
|
/*
|
|
* Non-coherent pages allocator
|
|
*/
|
|
static void *snd_dma_noncoherent_alloc(struct snd_dma_buffer *dmab, size_t size)
|
|
{
|
|
void *p;
|
|
|
|
p = dma_alloc_noncoherent(dmab->dev.dev, size, &dmab->addr,
|
|
dmab->dev.dir, DEFAULT_GFP);
|
|
if (p)
|
|
dmab->dev.need_sync = dma_need_sync(dmab->dev.dev, dmab->addr);
|
|
return p;
|
|
}
|
|
|
|
static void snd_dma_noncoherent_free(struct snd_dma_buffer *dmab)
|
|
{
|
|
dma_free_noncoherent(dmab->dev.dev, dmab->bytes, dmab->area,
|
|
dmab->addr, dmab->dev.dir);
|
|
}
|
|
|
|
static int snd_dma_noncoherent_mmap(struct snd_dma_buffer *dmab,
|
|
struct vm_area_struct *area)
|
|
{
|
|
area->vm_page_prot = vm_get_page_prot(area->vm_flags);
|
|
return dma_mmap_pages(dmab->dev.dev, area,
|
|
area->vm_end - area->vm_start,
|
|
virt_to_page(dmab->area));
|
|
}
|
|
|
|
static void snd_dma_noncoherent_sync(struct snd_dma_buffer *dmab,
|
|
enum snd_dma_sync_mode mode)
|
|
{
|
|
if (mode == SNDRV_DMA_SYNC_CPU) {
|
|
if (dmab->dev.dir != DMA_TO_DEVICE)
|
|
dma_sync_single_for_cpu(dmab->dev.dev, dmab->addr,
|
|
dmab->bytes, dmab->dev.dir);
|
|
} else {
|
|
if (dmab->dev.dir != DMA_FROM_DEVICE)
|
|
dma_sync_single_for_device(dmab->dev.dev, dmab->addr,
|
|
dmab->bytes, dmab->dev.dir);
|
|
}
|
|
}
|
|
|
|
static const struct snd_malloc_ops snd_dma_noncoherent_ops = {
|
|
.alloc = snd_dma_noncoherent_alloc,
|
|
.free = snd_dma_noncoherent_free,
|
|
.mmap = snd_dma_noncoherent_mmap,
|
|
.sync = snd_dma_noncoherent_sync,
|
|
};
|
|
|
|
#endif /* CONFIG_HAS_DMA */
|
|
|
|
/*
|
|
* Entry points
|
|
*/
|
|
static const struct snd_malloc_ops *snd_dma_ops[] = {
|
|
[SNDRV_DMA_TYPE_CONTINUOUS] = &snd_dma_continuous_ops,
|
|
[SNDRV_DMA_TYPE_VMALLOC] = &snd_dma_vmalloc_ops,
|
|
#ifdef CONFIG_HAS_DMA
|
|
[SNDRV_DMA_TYPE_DEV] = &snd_dma_dev_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 */
|
|
#ifdef CONFIG_SND_DMA_SGBUF
|
|
[SNDRV_DMA_TYPE_DEV_SG_FALLBACK] = &snd_dma_sg_fallback_ops,
|
|
[SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK] = &snd_dma_sg_fallback_ops,
|
|
#endif
|
|
#endif /* CONFIG_HAS_DMA */
|
|
};
|
|
|
|
static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab)
|
|
{
|
|
if (WARN_ON_ONCE(!dmab))
|
|
return NULL;
|
|
if (WARN_ON_ONCE(dmab->dev.type <= SNDRV_DMA_TYPE_UNKNOWN ||
|
|
dmab->dev.type >= ARRAY_SIZE(snd_dma_ops)))
|
|
return NULL;
|
|
return snd_dma_ops[dmab->dev.type];
|
|
}
|