Merge branch 'core/generic-dma-coherent' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip into for-linus

8 files changed, 20 insertions, 318 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c8f528284a94..652cd32a09c5 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -17,6 +17,7 @@ config ARM
         select HAVE_KRETPROBES if (HAVE_KPROBES)
         select HAVE_FTRACE if (!XIP_KERNEL)
         select HAVE_DYNAMIC_FTRACE if (HAVE_FTRACE)
+        select HAVE_GENERIC_DMA_COHERENT
         help
           The ARM series is a line of low-power-consumption RISC chip designs
           licensed by ARM Ltd and targeted at embedded applications and
diff --git a/arch/arm/mm/consistent.c b/arch/arm/mm/consistent.c
index 333a82a3717e..db7b3e38ef1d 100644
--- a/arch/arm/mm/consistent.c
+++ b/arch/arm/mm/consistent.c
@@ -274,6 +274,11 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
 void *
 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
 {
+        void *memory;
+
+        if (dma_alloc_from_coherent(dev, size, handle, &memory))
+                return memory;
+
         if (arch_is_coherent()) {
                 void *virt;
 
@@ -362,6 +367,9 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr
 
         WARN_ON(irqs_disabled());
 
+        if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
+                return;
+
         if (arch_is_coherent()) {
                 kfree(cpu_addr);
                 return;
diff --git a/arch/cris/arch-v32/drivers/Kconfig b/arch/cris/arch-v32/drivers/Kconfig
index 2a92cb1886ca..7a64fcef9d07 100644
--- a/arch/cris/arch-v32/drivers/Kconfig
+++ b/arch/cris/arch-v32/drivers/Kconfig
@@ -641,6 +641,7 @@ config PCI
        bool
        depends on ETRAX_CARDBUS
        default y
+       select HAVE_GENERIC_DMA_COHERENT
 
 config ETRAX_IOP_FW_LOAD
         tristate "IO-processor hotplug firmware loading support"
diff --git a/arch/cris/arch-v32/drivers/pci/dma.c b/arch/cris/arch-v32/drivers/pci/dma.c
index e0364654fc44..fbe65954ee6c 100644
--- a/arch/cris/arch-v32/drivers/pci/dma.c
+++ b/arch/cris/arch-v32/drivers/pci/dma.c
@@ -15,35 +15,16 @@
 #include <linux/pci.h>
 #include <asm/io.h>
 
-struct dma_coherent_mem {
-        void            *virt_base;
-        u32             device_base;
-        int             size;
-        int             flags;
-        unsigned long   *bitmap;
-};
-
 void *dma_alloc_coherent(struct device *dev, size_t size,
                            dma_addr_t *dma_handle, gfp_t gfp)
 {
         void *ret;
-        struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
         int order = get_order(size);
         /* ignore region specifiers */
         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
 
-        if (mem) {
-                int page = bitmap_find_free_region(mem->bitmap, mem->size,
-                                                     order);
-                if (page >= 0) {
-                        *dma_handle = mem->device_base + (page << PAGE_SHIFT);
-                        ret = mem->virt_base + (page << PAGE_SHIFT);
-                        memset(ret, 0, size);
-                        return ret;
-                }
-                if (mem->flags & DMA_MEMORY_EXCLUSIVE)
-                        return NULL;
-        }
+        if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
+                return ret;
 
         if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
                 gfp |= GFP_DMA;
@@ -60,90 +41,9 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
 void dma_free_coherent(struct device *dev, size_t size,
                          void *vaddr, dma_addr_t dma_handle)
 {
-        struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
         int order = get_order(size);
 
-        if (mem && vaddr >= mem->virt_base && vaddr < (mem->virt_base + (mem->size << PAGE_SHIFT))) {
-                int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;
-
-                bitmap_release_region(mem->bitmap, page, order);
-        } else
+        if (!dma_release_from_coherent(dev, order, vaddr))
                 free_pages((unsigned long)vaddr, order);
 }
 
-int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
-                                dma_addr_t device_addr, size_t size, int flags)
-{
-        void __iomem *mem_base;
-        int pages = size >> PAGE_SHIFT;
-        int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
-
-        if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
-                goto out;
-        if (!size)
-                goto out;
-        if (dev->dma_mem)
-                goto out;
-
-        /* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */
-
-        mem_base = ioremap(bus_addr, size);
-        if (!mem_base)
-                goto out;
-
-        dev->dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
-        if (!dev->dma_mem)
-                goto iounmap_out;
-        dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
-        if (!dev->dma_mem->bitmap)
-                goto free1_out;
-
-        dev->dma_mem->virt_base = mem_base;
-        dev->dma_mem->device_base = device_addr;
-        dev->dma_mem->size = pages;
-        dev->dma_mem->flags = flags;
-
-        if (flags & DMA_MEMORY_MAP)
-                return DMA_MEMORY_MAP;
-
-        return DMA_MEMORY_IO;
-
- free1_out:
-        kfree(dev->dma_mem);
- iounmap_out:
-        iounmap(mem_base);
- out:
-        return 0;
-}
-EXPORT_SYMBOL(dma_declare_coherent_memory);
-
-void dma_release_declared_memory(struct device *dev)
-{
-        struct dma_coherent_mem *mem = dev->dma_mem;
-
-        if(!mem)
-                return;
-        dev->dma_mem = NULL;
-        iounmap(mem->virt_base);
-        kfree(mem->bitmap);
-        kfree(mem);
-}
-EXPORT_SYMBOL(dma_release_declared_memory);
-
-void *dma_mark_declared_memory_occupied(struct device *dev,
-                                        dma_addr_t device_addr, size_t size)
-{
-        struct dma_coherent_mem *mem = dev->dma_mem;
-        int pages = (size + (device_addr & ~PAGE_MASK) + PAGE_SIZE - 1) >> PAGE_SHIFT;
-        int pos, err;
-
-        if (!mem)
-                return ERR_PTR(-EINVAL);
-
-        pos = (device_addr - mem->device_base) >> PAGE_SHIFT;
-        err = bitmap_allocate_region(mem->bitmap, pos, get_order(pages));
-        if (err != 0)
-                return ERR_PTR(err);
-        return mem->virt_base + (pos << PAGE_SHIFT);
-}
-EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 7bfb0d219d67..0b88dc462d73 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -11,6 +11,7 @@ config SUPERH
         select HAVE_CLK
         select HAVE_IDE
         select HAVE_OPROFILE
+        select HAVE_GENERIC_DMA_COHERENT
         help
           The SuperH is a RISC processor targeted for use in embedded systems
           and consumer electronics; it was also used in the Sega Dreamcast
diff --git a/arch/sh/mm/consistent.c b/arch/sh/mm/consistent.c
index 8277982d0938..b2ce014401b5 100644
--- a/arch/sh/mm/consistent.c
+++ b/arch/sh/mm/consistent.c
@@ -28,21 +28,10 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
                            dma_addr_t *dma_handle, gfp_t gfp)
 {
         void *ret, *ret_nocache;
-        struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
         int order = get_order(size);
 
-        if (mem) {
-                int page = bitmap_find_free_region(mem->bitmap, mem->size,
-                                                     order);
-                if (page >= 0) {
-                        *dma_handle = mem->device_base + (page << PAGE_SHIFT);
-                        ret = mem->virt_base + (page << PAGE_SHIFT);
-                        memset(ret, 0, size);
-                        return ret;
-                }
-                if (mem->flags & DMA_MEMORY_EXCLUSIVE)
-                        return NULL;
-        }
+        if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
+                return ret;
 
         ret = (void *)__get_free_pages(gfp, order);
         if (!ret)
@@ -72,11 +61,7 @@ void dma_free_coherent(struct device *dev, size_t size,
         struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
         int order = get_order(size);
 
-        if (mem && vaddr >= mem->virt_base && vaddr < (mem->virt_base + (mem->size << PAGE_SHIFT))) {
-                int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;
-
-                bitmap_release_region(mem->bitmap, page, order);
-        } else {
+        if (!dma_release_from_coherent(dev, order, vaddr)) {
                 WARN_ON(irqs_disabled());       /* for portability */
                 BUG_ON(mem && mem->flags & DMA_MEMORY_EXCLUSIVE);
                 free_pages((unsigned long)phys_to_virt(dma_handle), order);
@@ -85,83 +70,6 @@ void dma_free_coherent(struct device *dev, size_t size,
 }
 EXPORT_SYMBOL(dma_free_coherent);
 
-int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
-                                dma_addr_t device_addr, size_t size, int flags)
-{
-        void __iomem *mem_base = NULL;
-        int pages = size >> PAGE_SHIFT;
-        int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
-
-        if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
-                goto out;
-        if (!size)
-                goto out;
-        if (dev->dma_mem)
-                goto out;
-
-        /* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */
-
-        mem_base = ioremap_nocache(bus_addr, size);
-        if (!mem_base)
-                goto out;
-
-        dev->dma_mem = kmalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
-        if (!dev->dma_mem)
-                goto out;
-        dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
-        if (!dev->dma_mem->bitmap)
-                goto free1_out;
-
-        dev->dma_mem->virt_base = mem_base;
-        dev->dma_mem->device_base = device_addr;
-        dev->dma_mem->size = pages;
-        dev->dma_mem->flags = flags;
-
-        if (flags & DMA_MEMORY_MAP)
-                return DMA_MEMORY_MAP;
-
-        return DMA_MEMORY_IO;
-
- free1_out:
-        kfree(dev->dma_mem);
- out:
-        if (mem_base)
-                iounmap(mem_base);
-        return 0;
-}
-EXPORT_SYMBOL(dma_declare_coherent_memory);
-
-void dma_release_declared_memory(struct device *dev)
-{
-        struct dma_coherent_mem *mem = dev->dma_mem;
-
-        if (!mem)
-                return;
-        dev->dma_mem = NULL;
-        iounmap(mem->virt_base);
-        kfree(mem->bitmap);
-        kfree(mem);
-}
-EXPORT_SYMBOL(dma_release_declared_memory);
-
-void *dma_mark_declared_memory_occupied(struct device *dev,
-                                        dma_addr_t device_addr, size_t size)
-{
-        struct dma_coherent_mem *mem = dev->dma_mem;
-        int pages = (size + (device_addr & ~PAGE_MASK) + PAGE_SIZE - 1) >> PAGE_SHIFT;
-        int pos, err;
-
-        if (!mem)
-                return ERR_PTR(-EINVAL);
-
-        pos = (device_addr - mem->device_base) >> PAGE_SHIFT;
-        err = bitmap_allocate_region(mem->bitmap, pos, get_order(pages));
-        if (err != 0)
-                return ERR_PTR(err);
-        return mem->virt_base + (pos << PAGE_SHIFT);
-}
-EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
-
 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
                     enum dma_data_direction direction)
 {
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b6fa2877b173..3d0f2b6a5a16 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -30,6 +30,7 @@ config X86
         select HAVE_FTRACE
         select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
         select HAVE_ARCH_KGDB if !X86_VOYAGER
+        select HAVE_GENERIC_DMA_COHERENT if X86_32
         select HAVE_EFFICIENT_UNALIGNED_ACCESS
 
 config ARCH_DEFCONFIG
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 37544123896d..8dbffb846de9 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -192,124 +192,6 @@ static __init int iommu_setup(char *p)
 }
 early_param("iommu", iommu_setup);
 
-#ifdef CONFIG_X86_32
-int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
-                                dma_addr_t device_addr, size_t size, int flags)
-{
-        void __iomem *mem_base = NULL;
-        int pages = size >> PAGE_SHIFT;
-        int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
-
-        if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
-                goto out;
-        if (!size)
-                goto out;
-        if (dev->dma_mem)
-                goto out;
-
-        /* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */
-
-        mem_base = ioremap(bus_addr, size);
-        if (!mem_base)
-                goto out;
-
-        dev->dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
-        if (!dev->dma_mem)
-                goto out;
-        dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
-        if (!dev->dma_mem->bitmap)
-                goto free1_out;
-
-        dev->dma_mem->virt_base = mem_base;
-        dev->dma_mem->device_base = device_addr;
-        dev->dma_mem->size = pages;
-        dev->dma_mem->flags = flags;
-
-        if (flags & DMA_MEMORY_MAP)
-                return DMA_MEMORY_MAP;
-
-        return DMA_MEMORY_IO;
-
- free1_out:
-        kfree(dev->dma_mem);
- out:
-        if (mem_base)
-                iounmap(mem_base);
-        return 0;
-}
-EXPORT_SYMBOL(dma_declare_coherent_memory);
-
-void dma_release_declared_memory(struct device *dev)
-{
-        struct dma_coherent_mem *mem = dev->dma_mem;
-
-        if (!mem)
-                return;
-        dev->dma_mem = NULL;
-        iounmap(mem->virt_base);
-        kfree(mem->bitmap);
-        kfree(mem);
-}
-EXPORT_SYMBOL(dma_release_declared_memory);
-
-void *dma_mark_declared_memory_occupied(struct device *dev,
-                                        dma_addr_t device_addr, size_t size)
-{
-        struct dma_coherent_mem *mem = dev->dma_mem;
-        int pos, err;
-        int pages = (size + (device_addr & ~PAGE_MASK) + PAGE_SIZE - 1);
-
-        pages >>= PAGE_SHIFT;
-
-        if (!mem)
-                return ERR_PTR(-EINVAL);
-
-        pos = (device_addr - mem->device_base) >> PAGE_SHIFT;
-        err = bitmap_allocate_region(mem->bitmap, pos, get_order(pages));
-        if (err != 0)
-                return ERR_PTR(err);
-        return mem->virt_base + (pos << PAGE_SHIFT);
-}
-EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
-
-static int dma_alloc_from_coherent_mem(struct device *dev, ssize_t size,
-                                       dma_addr_t *dma_handle, void **ret)
-{
-        struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
-        int order = get_order(size);
-
-        if (mem) {
-                int page = bitmap_find_free_region(mem->bitmap, mem->size,
-                                                     order);
-                if (page >= 0) {
-                        *dma_handle = mem->device_base + (page << PAGE_SHIFT);
-                        *ret = mem->virt_base + (page << PAGE_SHIFT);
-                        memset(*ret, 0, size);
-                }
-                if (mem->flags & DMA_MEMORY_EXCLUSIVE)
-                        *ret = NULL;
-        }
-        return (mem != NULL);
-}
-
-static int dma_release_coherent(struct device *dev, int order, void *vaddr)
-{
-        struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
-
-        if (mem && vaddr >= mem->virt_base && vaddr <
-                   (mem->virt_base + (mem->size << PAGE_SHIFT))) {
-                int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;
-
-                bitmap_release_region(mem->bitmap, page, order);
-                return 1;
-        }
-        return 0;
-}
-#else
-#define dma_alloc_from_coherent_mem(dev, size, handle, ret) (0)
-#define dma_release_coherent(dev, order, vaddr) (0)
-#endif /* CONFIG_X86_32 */
-
 int dma_supported(struct device *dev, u64 mask)
 {
         struct dma_mapping_ops *ops = get_dma_ops(dev);
@@ -379,7 +261,7 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
         /* ignore region specifiers */
         gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 
-        if (dma_alloc_from_coherent_mem(dev, size, dma_handle, &memory))
+        if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
                 return memory;
 
         if (!dev) {
@@ -484,7 +366,7 @@ void dma_free_coherent(struct device *dev, size_t size,
 
         int order = get_order(size);
         WARN_ON(irqs_disabled());       /* for portability */
-        if (dma_release_coherent(dev, order, vaddr))
+        if (dma_release_from_coherent(dev, order, vaddr))
                 return;
         if (ops->unmap_single)
                 ops->unmap_single(dev, bus, size, 0);