sh: declared coherent memory support

@@ -3,6 +3,8 @@
  *
  * Copyright (C) 2004 - 2007  Paul Mundt
  *
+ * Declared coherent memory functions taken from arch/x86/kernel/pci-dma_32.c
+ *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.

@@ -13,66 +15,144 @@
 #include <asm/addrspace.h>
 #include <asm/io.h>
 
-void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *handle)
+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)
 {
-	struct page *page, *end, *free;
-	void *ret, *vp;
-	int order;
-
-	size = PAGE_ALIGN(size);
-	order = get_order(size);
-
-	page = alloc_pages(gfp, order);
-	if (!page)
-		return NULL;
-	split_page(page, order);
-
-	ret = page_address(page);
-	*handle = virt_to_phys(ret);
-
-	vp = ioremap_nocache(*handle, size);
-	if (!vp) {
-		free_pages((unsigned long)ret, order);
-		return NULL;
+	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;
 	}
 
-	memset(vp, 0, size);
+	if (dev = NULL || (dev->coherent_dma_mask < 0xffffffff))
+		gfp |= GFP_DMA;
 
-	/*
-	 * We must flush the cache before we pass it on to the device
-	 */
-	dma_cache_sync(NULL, ret, size, DMA_BIDIRECTIONAL);
-
-	page = virt_to_page(ret);
-	free = page + (size >> PAGE_SHIFT);
-	end  = page + (1 << order);
-
-	while (++page < end) {
-		/* Free any unused pages */
-		if (page >= free) {
-			__free_page(page);
-		}
+	ret = (void *)__get_free_pages(gfp, order);
+
+	if (ret != NULL) {
+		memset(ret, 0, size);
+		*dma_handle = virt_to_phys(ret);
 	}
+	return ret;
+}
+EXPORT_SYMBOL(dma_alloc_coherent);
 
-	return vp;
+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);
+
+	WARN_ON(irqs_disabled());	/* for portability */
+	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
+		free_pages((unsigned long)vaddr, order);
 }
-EXPORT_SYMBOL(consistent_alloc);
+EXPORT_SYMBOL(dma_free_coherent);
 
-void consistent_free(void *vaddr, size_t size, dma_addr_t dma_handle)
+int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
+				dma_addr_t device_addr, size_t size, int flags)
 {
-	struct page *page;
-	unsigned long addr;
+	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);
 
-	addr = (unsigned long)phys_to_virt((unsigned long)dma_handle);
-	page = virt_to_page(addr);
+void dma_release_declared_memory(struct device *dev)
+{
+	struct dma_coherent_mem *mem = dev->dma_mem;
 
-	free_pages(addr, get_order(size));
+	if (!mem)
+		return;
+	dev->dma_mem = NULL;
+	iounmap(mem->virt_base);
+	kfree(mem->bitmap);
+	kfree(mem);
+}
+EXPORT_SYMBOL(dma_release_declared_memory);
 
-	iounmap(vaddr);
+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(consistent_free);
+EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
 
-void consistent_sync(void *vaddr, size_t size, int direction)
+void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+		    enum dma_data_direction direction)
 {
 #ifdef CONFIG_CPU_SH5
 	void *p1addr = vaddr;

@@ -94,4 +174,4 @@ void consistent_sync(void *vaddr, size_t
 		BUG();
 	}
 }
-EXPORT_SYMBOL(consistent_sync);
+EXPORT_SYMBOL(dma_cache_sync);

79 lines not on this page · raw message

@@ -3,6 +3,8 @@
  *
  * Copyright (C) 2004 - 2007  Paul Mundt
  *
+ * Declared coherent memory functions based on arch/x86/kernel/pci-dma_32.c
+ *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.

@@ -13,66 +15,146 @@
 #include <asm/addrspace.h>
 #include <asm/io.h>
 
-void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *handle)
+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)
 {
-	struct page *page, *end, *free;
-	void *ret, *vp;
-	int order;
-
-	size = PAGE_ALIGN(size);
-	order = get_order(size);
-
-	page = alloc_pages(gfp, order);
-	if (!page)
-		return NULL;
-	split_page(page, order);
-
-	ret = page_address(page);
-	*handle = virt_to_phys(ret);
-
-	vp = ioremap_nocache(*handle, size);
-	if (!vp) {
-		free_pages((unsigned long)ret, order);
-		return NULL;
+	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);
+			return ret;
+		}
+		if (mem->flags & DMA_MEMORY_EXCLUSIVE)
+			return NULL;
 	}
 
-	memset(vp, 0, size);
+	ret = (void *)__get_free_pages(gfp, order);
 
-	/*
-	 * We must flush the cache before we pass it on to the device
-	 */
-	dma_cache_sync(NULL, ret, size, DMA_BIDIRECTIONAL);
-
-	page = virt_to_page(ret);
-	free = page + (size >> PAGE_SHIFT);
-	end  = page + (1 << order);
-
-	while (++page < end) {
-		/* Free any unused pages */
-		if (page >= free) {
-			__free_page(page);
-		}
+	if (ret != NULL) {
+		memset(ret, 0, size);
+		/*
+		 * Pages from the page allocator may have data present in
+		 * cache. So flush the cache before using uncached memory.
+		 */
+		dma_cache_sync(NULL, ret, size, DMA_BIDIRECTIONAL);
+		*dma_handle = virt_to_phys(ret);
 	}
+	return ret;
+}
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+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);
 
-	return vp;
+	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 {
+		WARN_ON(irqs_disabled());	/* for portability */
+		BUG_ON(mem && mem->flags & DMA_MEMORY_EXCLUSIVE);
+		free_pages((unsigned long)vaddr, order);
+	}
 }
-EXPORT_SYMBOL(consistent_alloc);
+EXPORT_SYMBOL(dma_free_coherent);
 
-void consistent_free(void *vaddr, size_t size, dma_addr_t dma_handle)
+int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
+				dma_addr_t device_addr, size_t size, int flags)
 {
-	struct page *page;
-	unsigned long addr;
+	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);
 
-	addr = (unsigned long)phys_to_virt((unsigned long)dma_handle);
-	page = virt_to_page(addr);
+void dma_release_declared_memory(struct device *dev)
+{
+	struct dma_coherent_mem *mem = dev->dma_mem;
 
-	free_pages(addr, get_order(size));
+	if (!mem)
+		return;
+	dev->dma_mem = NULL;
+	iounmap(mem->virt_base);
+	kfree(mem->bitmap);
+	kfree(mem);
+}
+EXPORT_SYMBOL(dma_release_declared_memory);
 
-	iounmap(vaddr);
+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(consistent_free);
+EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
 
-void consistent_sync(void *vaddr, size_t size, int direction)
+void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+		    enum dma_data_direction direction)
 {
 #ifdef CONFIG_CPU_SH5
 	void *p1addr = vaddr;

@@ -94,4 +176,4 @@ void consistent_sync(void *vaddr, size_t
 		BUG();
 	}
 }
-EXPORT_SYMBOL(consistent_sync);
+EXPORT_SYMBOL(dma_cache_sync);

79 lines not on this page · raw message

@@ -26,7 +26,7 @@ struct dma_coherent_mem {
 void *dma_alloc_coherent(struct device *dev, size_t size,
 			   dma_addr_t *dma_handle, gfp_t gfp)
 {
-	void *ret;
+	void *ret, *ret_nocache;
 	struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
 	int order = get_order(size);
 

@@ -44,17 +44,24 @@ void *dma_alloc_coherent(struct device *
 	}
 
 	ret = (void *)__get_free_pages(gfp, order);
+	if (!ret)
+		return NULL;
 
-	if (ret != NULL) {
-		memset(ret, 0, size);
-		/*
-		 * Pages from the page allocator may have data present in
-		 * cache. So flush the cache before using uncached memory.
-		 */
-		dma_cache_sync(NULL, ret, size, DMA_BIDIRECTIONAL);
-		*dma_handle = virt_to_phys(ret);
+	memset(ret, 0, size);
+	/*
+	 * Pages from the page allocator may have data present in
+	 * cache. So flush the cache before using uncached memory.
+	 */
+	dma_cache_sync(dev, ret, size, DMA_BIDIRECTIONAL);
+
+	ret_nocache = ioremap_nocache(virt_to_phys(ret), size);
+	if (!ret_nocache) {
+		free_pages((unsigned long)ret, order);
+		return NULL;
 	}
-	return ret;
+
+	*dma_handle = virt_to_phys(ret);
+	return ret_nocache;
 }
 EXPORT_SYMBOL(dma_alloc_coherent);
 

@@ -71,7 +78,8 @@ void dma_free_coherent(struct device *de
 	} else {
 		WARN_ON(irqs_disabled());	/* for portability */
 		BUG_ON(mem && mem->flags & DMA_MEMORY_EXCLUSIVE);
-		free_pages((unsigned long)vaddr, order);
+		free_pages((unsigned long)phys_to_virt(dma_handle), order);
+		iounmap(vaddr);
 	}
 }
 EXPORT_SYMBOL(dma_free_coherent);