forked from Minki/linux
x86: use generic per-device dma coherent allocator
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Dmitry Baryshkov
Ingo Molnar
parent
ee7e5516be
commit
323ec001c6
@ -25,6 +25,7 @@ config X86
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select HAVE_KRETPROBES
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select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
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select HAVE_ARCH_KGDB if !X86_VOYAGER
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select HAVE_GENERIC_DMA_COHERENT if X86_32
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config ARCH_DEFCONFIG
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string
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@ -197,124 +197,6 @@ static __init int iommu_setup(char *p)
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}
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early_param("iommu", iommu_setup);
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#ifdef CONFIG_X86_32
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int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
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dma_addr_t device_addr, size_t size, int flags)
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{
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void __iomem *mem_base = NULL;
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int pages = size >> PAGE_SHIFT;
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int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
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if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
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goto out;
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if (!size)
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goto out;
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if (dev->dma_mem)
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goto out;
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/* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */
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mem_base = ioremap(bus_addr, size);
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if (!mem_base)
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goto out;
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dev->dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
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if (!dev->dma_mem)
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goto out;
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dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
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if (!dev->dma_mem->bitmap)
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goto free1_out;
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dev->dma_mem->virt_base = mem_base;
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dev->dma_mem->device_base = device_addr;
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dev->dma_mem->size = pages;
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dev->dma_mem->flags = flags;
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if (flags & DMA_MEMORY_MAP)
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return DMA_MEMORY_MAP;
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return DMA_MEMORY_IO;
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free1_out:
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kfree(dev->dma_mem);
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out:
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if (mem_base)
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iounmap(mem_base);
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return 0;
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}
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EXPORT_SYMBOL(dma_declare_coherent_memory);
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void dma_release_declared_memory(struct device *dev)
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{
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struct dma_coherent_mem *mem = dev->dma_mem;
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if (!mem)
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return;
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dev->dma_mem = NULL;
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iounmap(mem->virt_base);
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kfree(mem->bitmap);
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kfree(mem);
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}
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EXPORT_SYMBOL(dma_release_declared_memory);
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void *dma_mark_declared_memory_occupied(struct device *dev,
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dma_addr_t device_addr, size_t size)
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{
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struct dma_coherent_mem *mem = dev->dma_mem;
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int pos, err;
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int pages = (size + (device_addr & ~PAGE_MASK) + PAGE_SIZE - 1);
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pages >>= PAGE_SHIFT;
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if (!mem)
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return ERR_PTR(-EINVAL);
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pos = (device_addr - mem->device_base) >> PAGE_SHIFT;
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err = bitmap_allocate_region(mem->bitmap, pos, get_order(pages));
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if (err != 0)
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return ERR_PTR(err);
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return mem->virt_base + (pos << PAGE_SHIFT);
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}
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EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
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static int dma_alloc_from_coherent_mem(struct device *dev, ssize_t size,
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dma_addr_t *dma_handle, void **ret)
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{
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struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
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int order = get_order(size);
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if (mem) {
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int page = bitmap_find_free_region(mem->bitmap, mem->size,
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order);
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if (page >= 0) {
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*dma_handle = mem->device_base + (page << PAGE_SHIFT);
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*ret = mem->virt_base + (page << PAGE_SHIFT);
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memset(*ret, 0, size);
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}
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if (mem->flags & DMA_MEMORY_EXCLUSIVE)
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*ret = NULL;
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}
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return (mem != NULL);
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}
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static int dma_release_coherent(struct device *dev, int order, void *vaddr)
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{
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struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
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if (mem && vaddr >= mem->virt_base && vaddr <
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(mem->virt_base + (mem->size << PAGE_SHIFT))) {
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int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;
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bitmap_release_region(mem->bitmap, page, order);
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return 1;
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}
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return 0;
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}
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#else
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#define dma_alloc_from_coherent_mem(dev, size, handle, ret) (0)
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#define dma_release_coherent(dev, order, vaddr) (0)
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#endif /* CONFIG_X86_32 */
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int dma_supported(struct device *dev, u64 mask)
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{
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#ifdef CONFIG_PCI
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@ -383,7 +265,7 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
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/* ignore region specifiers */
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gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
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if (dma_alloc_from_coherent_mem(dev, size, dma_handle, &memory))
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if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
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return memory;
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if (!dev) {
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@ -486,7 +368,7 @@ void dma_free_coherent(struct device *dev, size_t size,
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{
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int order = get_order(size);
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WARN_ON(irqs_disabled()); /* for portability */
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if (dma_release_coherent(dev, order, vaddr))
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if (dma_release_from_coherent(dev, order, vaddr))
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return;
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if (dma_ops->unmap_single)
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dma_ops->unmap_single(dev, bus, size, 0);
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@ -213,25 +213,5 @@ static inline int dma_get_cache_alignment(void)
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#define dma_is_consistent(d, h) (1)
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#ifdef CONFIG_X86_32
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# define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
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struct dma_coherent_mem {
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void *virt_base;
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u32 device_base;
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int size;
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int flags;
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unsigned long *bitmap;
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};
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extern int
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dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
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dma_addr_t device_addr, size_t size, int flags);
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extern void
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dma_release_declared_memory(struct device *dev);
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extern void *
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dma_mark_declared_memory_occupied(struct device *dev,
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dma_addr_t device_addr, size_t size);
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#endif /* CONFIG_X86_32 */
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#include <asm-generic/dma-coherent.h>
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#endif
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