summaryrefslogtreecommitdiffstats
path: root/sound/core/memalloc.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /sound/core/memalloc.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sound/core/memalloc.c')
-rw-r--r--sound/core/memalloc.c951
1 files changed, 951 insertions, 0 deletions
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
new file mode 100644
index 000000000..11ff1ee51
--- /dev/null
+++ b/sound/core/memalloc.c
@@ -0,0 +1,951 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ * Takashi Iwai <tiwai@suse.de>
+ *
+ * Generic memory allocators
+ */
+
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <linux/dma-map-ops.h>
+#include <linux/genalloc.h>
+#include <linux/highmem.h>
+#include <linux/vmalloc.h>
+#ifdef CONFIG_X86
+#include <asm/set_memory.h>
+#endif
+#include <sound/memalloc.h>
+#include "memalloc_local.h"
+
+#define DEFAULT_GFP \
+ (GFP_KERNEL | \
+ __GFP_COMP | /* compound page lets parts be mapped */ \
+ __GFP_RETRY_MAYFAIL | /* don't trigger OOM-killer */ \
+ __GFP_NOWARN) /* no stack trace print - this call is non-critical */
+
+static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab);
+
+#ifdef CONFIG_SND_DMA_SGBUF
+static void *snd_dma_sg_fallback_alloc(struct snd_dma_buffer *dmab, size_t size);
+#endif
+
+static void *__snd_dma_alloc_pages(struct snd_dma_buffer *dmab, size_t size)
+{
+ const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
+
+ if (WARN_ON_ONCE(!ops || !ops->alloc))
+ return NULL;
+ return ops->alloc(dmab, size);
+}
+
+/**
+ * snd_dma_alloc_dir_pages - allocate the buffer area according to the given
+ * type and direction
+ * @type: the DMA buffer type
+ * @device: the device pointer
+ * @dir: DMA direction
+ * @size: the buffer size to allocate
+ * @dmab: buffer allocation record to store the allocated data
+ *
+ * Calls the memory-allocator function for the corresponding
+ * buffer type.
+ *
+ * Return: Zero if the buffer with the given size is allocated successfully,
+ * otherwise a negative value on error.
+ */
+int snd_dma_alloc_dir_pages(int type, struct device *device,
+ enum dma_data_direction dir, size_t size,
+ struct snd_dma_buffer *dmab)
+{
+ if (WARN_ON(!size))
+ return -ENXIO;
+ if (WARN_ON(!dmab))
+ return -ENXIO;
+
+ size = PAGE_ALIGN(size);
+ dmab->dev.type = type;
+ dmab->dev.dev = device;
+ dmab->dev.dir = dir;
+ dmab->bytes = 0;
+ dmab->addr = 0;
+ dmab->private_data = NULL;
+ dmab->area = __snd_dma_alloc_pages(dmab, size);
+ if (!dmab->area)
+ return -ENOMEM;
+ dmab->bytes = size;
+ return 0;
+}
+EXPORT_SYMBOL(snd_dma_alloc_dir_pages);
+
+/**
+ * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
+ * @type: the DMA buffer type
+ * @device: the device pointer
+ * @size: the buffer size to allocate
+ * @dmab: buffer allocation record to store the allocated data
+ *
+ * Calls the memory-allocator function for the corresponding
+ * buffer type. When no space is left, this function reduces the size and
+ * tries to allocate again. The size actually allocated is stored in
+ * res_size argument.
+ *
+ * Return: Zero if the buffer with the given size is allocated successfully,
+ * otherwise a negative value on error.
+ */
+int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
+ struct snd_dma_buffer *dmab)
+{
+ int err;
+
+ while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
+ if (err != -ENOMEM)
+ return err;
+ if (size <= PAGE_SIZE)
+ return -ENOMEM;
+ size >>= 1;
+ size = PAGE_SIZE << get_order(size);
+ }
+ if (! dmab->area)
+ return -ENOMEM;
+ return 0;
+}
+EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
+
+/**
+ * snd_dma_free_pages - release the allocated buffer
+ * @dmab: the buffer allocation record to release
+ *
+ * Releases the allocated buffer via snd_dma_alloc_pages().
+ */
+void snd_dma_free_pages(struct snd_dma_buffer *dmab)
+{
+ const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
+
+ if (ops && ops->free)
+ ops->free(dmab);
+}
+EXPORT_SYMBOL(snd_dma_free_pages);
+
+/* called by devres */
+static void __snd_release_pages(struct device *dev, void *res)
+{
+ snd_dma_free_pages(res);
+}
+
+/**
+ * snd_devm_alloc_dir_pages - allocate the buffer and manage with devres
+ * @dev: the device pointer
+ * @type: the DMA buffer type
+ * @dir: DMA direction
+ * @size: the buffer size to allocate
+ *
+ * Allocate buffer pages depending on the given type and manage using devres.
+ * The pages will be released automatically at the device removal.
+ *
+ * Unlike snd_dma_alloc_pages(), this function requires the real device pointer,
+ * hence it can't work with SNDRV_DMA_TYPE_CONTINUOUS or
+ * SNDRV_DMA_TYPE_VMALLOC type.
+ *
+ * Return: the snd_dma_buffer object at success, or NULL if failed
+ */
+struct snd_dma_buffer *
+snd_devm_alloc_dir_pages(struct device *dev, int type,
+ enum dma_data_direction dir, size_t size)
+{
+ struct snd_dma_buffer *dmab;
+ int err;
+
+ if (WARN_ON(type == SNDRV_DMA_TYPE_CONTINUOUS ||
+ type == SNDRV_DMA_TYPE_VMALLOC))
+ return NULL;
+
+ dmab = devres_alloc(__snd_release_pages, sizeof(*dmab), GFP_KERNEL);
+ if (!dmab)
+ return NULL;
+
+ err = snd_dma_alloc_dir_pages(type, dev, dir, size, dmab);
+ if (err < 0) {
+ devres_free(dmab);
+ return NULL;
+ }
+
+ devres_add(dev, dmab);
+ return dmab;
+}
+EXPORT_SYMBOL_GPL(snd_devm_alloc_dir_pages);
+
+/**
+ * snd_dma_buffer_mmap - perform mmap of the given DMA buffer
+ * @dmab: buffer allocation information
+ * @area: VM area information
+ *
+ * Return: zero if successful, or a negative error code
+ */
+int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
+ struct vm_area_struct *area)
+{
+ const struct snd_malloc_ops *ops;
+
+ if (!dmab)
+ return -ENOENT;
+ ops = snd_dma_get_ops(dmab);
+ if (ops && ops->mmap)
+ return ops->mmap(dmab, area);
+ else
+ return -ENOENT;
+}
+EXPORT_SYMBOL(snd_dma_buffer_mmap);
+
+#ifdef CONFIG_HAS_DMA
+/**
+ * snd_dma_buffer_sync - sync DMA buffer between CPU and device
+ * @dmab: buffer allocation information
+ * @mode: sync mode
+ */
+void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,
+ enum snd_dma_sync_mode mode)
+{
+ const struct snd_malloc_ops *ops;
+
+ if (!dmab || !dmab->dev.need_sync)
+ return;
+ ops = snd_dma_get_ops(dmab);
+ if (ops && ops->sync)
+ ops->sync(dmab, mode);
+}
+EXPORT_SYMBOL_GPL(snd_dma_buffer_sync);
+#endif /* CONFIG_HAS_DMA */
+
+/**
+ * snd_sgbuf_get_addr - return the physical address at the corresponding offset
+ * @dmab: buffer allocation information
+ * @offset: offset in the ring buffer
+ *
+ * Return: the physical address
+ */
+dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset)
+{
+ const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
+
+ if (ops && ops->get_addr)
+ return ops->get_addr(dmab, offset);
+ else
+ return dmab->addr + offset;
+}
+EXPORT_SYMBOL(snd_sgbuf_get_addr);
+
+/**
+ * snd_sgbuf_get_page - return the physical page at the corresponding offset
+ * @dmab: buffer allocation information
+ * @offset: offset in the ring buffer
+ *
+ * Return: the page pointer
+ */
+struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset)
+{
+ const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
+
+ if (ops && ops->get_page)
+ return ops->get_page(dmab, offset);
+ else
+ return virt_to_page(dmab->area + offset);
+}
+EXPORT_SYMBOL(snd_sgbuf_get_page);
+
+/**
+ * snd_sgbuf_get_chunk_size - compute the max chunk size with continuous pages
+ * on sg-buffer
+ * @dmab: buffer allocation information
+ * @ofs: offset in the ring buffer
+ * @size: the requested size
+ *
+ * Return: the chunk size
+ */
+unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
+ unsigned int ofs, unsigned int size)
+{
+ const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
+
+ if (ops && ops->get_chunk_size)
+ return ops->get_chunk_size(dmab, ofs, size);
+ else
+ return size;
+}
+EXPORT_SYMBOL(snd_sgbuf_get_chunk_size);
+
+/*
+ * Continuous pages allocator
+ */
+static void *do_alloc_pages(struct device *dev, size_t size, dma_addr_t *addr,
+ bool wc)
+{
+ void *p;
+ gfp_t gfp = GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN;
+
+ again:
+ p = alloc_pages_exact(size, gfp);
+ if (!p)
+ return NULL;
+ *addr = page_to_phys(virt_to_page(p));
+ if (!dev)
+ return p;
+ if ((*addr + size - 1) & ~dev->coherent_dma_mask) {
+ if (IS_ENABLED(CONFIG_ZONE_DMA32) && !(gfp & GFP_DMA32)) {
+ gfp |= GFP_DMA32;
+ goto again;
+ }
+ if (IS_ENABLED(CONFIG_ZONE_DMA) && !(gfp & GFP_DMA)) {
+ gfp = (gfp & ~GFP_DMA32) | GFP_DMA;
+ goto again;
+ }
+ }
+#ifdef CONFIG_X86
+ if (wc)
+ set_memory_wc((unsigned long)(p), size >> PAGE_SHIFT);
+#endif
+ return p;
+}
+
+static void do_free_pages(void *p, size_t size, bool wc)
+{
+#ifdef CONFIG_X86
+ if (wc)
+ set_memory_wb((unsigned long)(p), size >> PAGE_SHIFT);
+#endif
+ free_pages_exact(p, size);
+}
+
+
+static void *snd_dma_continuous_alloc(struct snd_dma_buffer *dmab, size_t size)
+{
+ return do_alloc_pages(dmab->dev.dev, size, &dmab->addr, false);
+}
+
+static void snd_dma_continuous_free(struct snd_dma_buffer *dmab)
+{
+ do_free_pages(dmab->area, dmab->bytes, false);
+}
+
+static int snd_dma_continuous_mmap(struct snd_dma_buffer *dmab,
+ struct vm_area_struct *area)
+{
+ return remap_pfn_range(area, area->vm_start,
+ dmab->addr >> PAGE_SHIFT,
+ area->vm_end - area->vm_start,
+ area->vm_page_prot);
+}
+
+static const struct snd_malloc_ops snd_dma_continuous_ops = {
+ .alloc = snd_dma_continuous_alloc,
+ .free = snd_dma_continuous_free,
+ .mmap = snd_dma_continuous_mmap,
+};
+
+/*
+ * VMALLOC allocator
+ */
+static void *snd_dma_vmalloc_alloc(struct snd_dma_buffer *dmab, size_t size)
+{
+ return vmalloc(size);
+}
+
+static void snd_dma_vmalloc_free(struct snd_dma_buffer *dmab)
+{
+ vfree(dmab->area);
+}
+
+static int snd_dma_vmalloc_mmap(struct snd_dma_buffer *dmab,
+ struct vm_area_struct *area)
+{
+ return remap_vmalloc_range(area, dmab->area, 0);
+}
+
+#define get_vmalloc_page_addr(dmab, offset) \
+ page_to_phys(vmalloc_to_page((dmab)->area + (offset)))
+
+static dma_addr_t snd_dma_vmalloc_get_addr(struct snd_dma_buffer *dmab,
+ size_t offset)
+{
+ return get_vmalloc_page_addr(dmab, offset) + offset % PAGE_SIZE;
+}
+
+static struct page *snd_dma_vmalloc_get_page(struct snd_dma_buffer *dmab,
+ size_t offset)
+{
+ return vmalloc_to_page(dmab->area + offset);
+}
+
+static unsigned int
+snd_dma_vmalloc_get_chunk_size(struct snd_dma_buffer *dmab,
+ unsigned int ofs, unsigned int size)
+{
+ unsigned int start, end;
+ unsigned long addr;
+
+ start = ALIGN_DOWN(ofs, PAGE_SIZE);
+ end = ofs + size - 1; /* the last byte address */
+ /* check page continuity */
+ addr = get_vmalloc_page_addr(dmab, start);
+ for (;;) {
+ start += PAGE_SIZE;
+ if (start > end)
+ break;
+ addr += PAGE_SIZE;
+ if (get_vmalloc_page_addr(dmab, start) != addr)
+ return start - ofs;
+ }
+ /* ok, all on continuous pages */
+ return size;
+}
+
+static const struct snd_malloc_ops snd_dma_vmalloc_ops = {
+ .alloc = snd_dma_vmalloc_alloc,
+ .free = snd_dma_vmalloc_free,
+ .mmap = snd_dma_vmalloc_mmap,
+ .get_addr = snd_dma_vmalloc_get_addr,
+ .get_page = snd_dma_vmalloc_get_page,
+ .get_chunk_size = snd_dma_vmalloc_get_chunk_size,
+};
+
+#ifdef CONFIG_HAS_DMA
+/*
+ * IRAM allocator
+ */
+#ifdef CONFIG_GENERIC_ALLOCATOR
+static void *snd_dma_iram_alloc(struct snd_dma_buffer *dmab, size_t size)
+{
+ struct device *dev = dmab->dev.dev;
+ struct gen_pool *pool;
+ void *p;
+
+ if (dev->of_node) {
+ pool = of_gen_pool_get(dev->of_node, "iram", 0);
+ /* Assign the pool into private_data field */
+ dmab->private_data = pool;
+
+ p = gen_pool_dma_alloc_align(pool, size, &dmab->addr, PAGE_SIZE);
+ if (p)
+ return p;
+ }
+
+ /* Internal memory might have limited size and no enough space,
+ * so if we fail to malloc, try to fetch memory traditionally.
+ */
+ dmab->dev.type = SNDRV_DMA_TYPE_DEV;
+ return __snd_dma_alloc_pages(dmab, size);
+}
+
+static void snd_dma_iram_free(struct snd_dma_buffer *dmab)
+{
+ struct gen_pool *pool = dmab->private_data;
+
+ if (pool && dmab->area)
+ gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
+}
+
+static int snd_dma_iram_mmap(struct snd_dma_buffer *dmab,
+ struct vm_area_struct *area)
+{
+ area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
+ return remap_pfn_range(area, area->vm_start,
+ dmab->addr >> PAGE_SHIFT,
+ area->vm_end - area->vm_start,
+ area->vm_page_prot);
+}
+
+static const struct snd_malloc_ops snd_dma_iram_ops = {
+ .alloc = snd_dma_iram_alloc,
+ .free = snd_dma_iram_free,
+ .mmap = snd_dma_iram_mmap,
+};
+#endif /* CONFIG_GENERIC_ALLOCATOR */
+
+/*
+ * Coherent device pages allocator
+ */
+static void *snd_dma_dev_alloc(struct snd_dma_buffer *dmab, size_t size)
+{
+ return dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP);
+}
+
+static void snd_dma_dev_free(struct snd_dma_buffer *dmab)
+{
+ dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
+}
+
+static int snd_dma_dev_mmap(struct snd_dma_buffer *dmab,
+ struct vm_area_struct *area)
+{
+ return dma_mmap_coherent(dmab->dev.dev, area,
+ dmab->area, dmab->addr, dmab->bytes);
+}
+
+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];
+}