2 * drivers/base/dma-mapping.c - arch-independent dma-mapping routines
4 * Copyright (c) 2006 SUSE Linux Products GmbH
5 * Copyright (c) 2006 Tejun Heo <teheo@suse.de>
7 * This file is released under the GPLv2.
10 #include <linux/acpi.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/export.h>
13 #include <linux/gfp.h>
14 #include <linux/of_device.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
24 dma_addr_t dma_handle;
27 static void dmam_coherent_release(struct device *dev, void *res)
29 struct dma_devres *this = res;
31 dma_free_coherent(dev, this->size, this->vaddr, this->dma_handle);
34 static void dmam_noncoherent_release(struct device *dev, void *res)
36 struct dma_devres *this = res;
38 dma_free_noncoherent(dev, this->size, this->vaddr, this->dma_handle);
41 static int dmam_match(struct device *dev, void *res, void *match_data)
43 struct dma_devres *this = res, *match = match_data;
45 if (this->vaddr == match->vaddr) {
46 WARN_ON(this->size != match->size ||
47 this->dma_handle != match->dma_handle);
54 * dmam_alloc_coherent - Managed dma_alloc_coherent()
55 * @dev: Device to allocate coherent memory for
56 * @size: Size of allocation
57 * @dma_handle: Out argument for allocated DMA handle
58 * @gfp: Allocation flags
60 * Managed dma_alloc_coherent(). Memory allocated using this function
61 * will be automatically released on driver detach.
64 * Pointer to allocated memory on success, NULL on failure.
66 void *dmam_alloc_coherent(struct device *dev, size_t size,
67 dma_addr_t *dma_handle, gfp_t gfp)
69 struct dma_devres *dr;
72 dr = devres_alloc(dmam_coherent_release, sizeof(*dr), gfp);
76 vaddr = dma_alloc_coherent(dev, size, dma_handle, gfp);
83 dr->dma_handle = *dma_handle;
90 EXPORT_SYMBOL(dmam_alloc_coherent);
93 * dmam_free_coherent - Managed dma_free_coherent()
94 * @dev: Device to free coherent memory for
95 * @size: Size of allocation
96 * @vaddr: Virtual address of the memory to free
97 * @dma_handle: DMA handle of the memory to free
99 * Managed dma_free_coherent().
101 void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
102 dma_addr_t dma_handle)
104 struct dma_devres match_data = { size, vaddr, dma_handle };
106 dma_free_coherent(dev, size, vaddr, dma_handle);
107 WARN_ON(devres_destroy(dev, dmam_coherent_release, dmam_match,
110 EXPORT_SYMBOL(dmam_free_coherent);
113 * dmam_alloc_non_coherent - Managed dma_alloc_noncoherent()
114 * @dev: Device to allocate non_coherent memory for
115 * @size: Size of allocation
116 * @dma_handle: Out argument for allocated DMA handle
117 * @gfp: Allocation flags
119 * Managed dma_alloc_noncoherent(). Memory allocated using this
120 * function will be automatically released on driver detach.
123 * Pointer to allocated memory on success, NULL on failure.
125 void *dmam_alloc_noncoherent(struct device *dev, size_t size,
126 dma_addr_t *dma_handle, gfp_t gfp)
128 struct dma_devres *dr;
131 dr = devres_alloc(dmam_noncoherent_release, sizeof(*dr), gfp);
135 vaddr = dma_alloc_noncoherent(dev, size, dma_handle, gfp);
142 dr->dma_handle = *dma_handle;
149 EXPORT_SYMBOL(dmam_alloc_noncoherent);
152 * dmam_free_coherent - Managed dma_free_noncoherent()
153 * @dev: Device to free noncoherent memory for
154 * @size: Size of allocation
155 * @vaddr: Virtual address of the memory to free
156 * @dma_handle: DMA handle of the memory to free
158 * Managed dma_free_noncoherent().
160 void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
161 dma_addr_t dma_handle)
163 struct dma_devres match_data = { size, vaddr, dma_handle };
165 dma_free_noncoherent(dev, size, vaddr, dma_handle);
166 WARN_ON(!devres_destroy(dev, dmam_noncoherent_release, dmam_match,
169 EXPORT_SYMBOL(dmam_free_noncoherent);
171 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
173 static void dmam_coherent_decl_release(struct device *dev, void *res)
175 dma_release_declared_memory(dev);
179 * dmam_declare_coherent_memory - Managed dma_declare_coherent_memory()
180 * @dev: Device to declare coherent memory for
181 * @phys_addr: Physical address of coherent memory to be declared
182 * @device_addr: Device address of coherent memory to be declared
183 * @size: Size of coherent memory to be declared
186 * Managed dma_declare_coherent_memory().
189 * 0 on success, -errno on failure.
191 int dmam_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
192 dma_addr_t device_addr, size_t size, int flags)
197 res = devres_alloc(dmam_coherent_decl_release, 0, GFP_KERNEL);
201 rc = dma_declare_coherent_memory(dev, phys_addr, device_addr, size,
204 devres_add(dev, res);
213 EXPORT_SYMBOL(dmam_declare_coherent_memory);
216 * dmam_release_declared_memory - Managed dma_release_declared_memory().
217 * @dev: Device to release declared coherent memory for
219 * Managed dmam_release_declared_memory().
221 void dmam_release_declared_memory(struct device *dev)
223 WARN_ON(devres_destroy(dev, dmam_coherent_decl_release, NULL, NULL));
225 EXPORT_SYMBOL(dmam_release_declared_memory);
230 * Create scatter-list for the already allocated DMA buffer.
232 int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
233 void *cpu_addr, dma_addr_t handle, size_t size)
235 struct page *page = virt_to_page(cpu_addr);
238 ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
242 sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
245 EXPORT_SYMBOL(dma_common_get_sgtable);
248 * Create userspace mapping for the DMA-coherent memory.
250 int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
251 void *cpu_addr, dma_addr_t dma_addr, size_t size)
254 #if defined(CONFIG_MMU) && !defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP)
255 unsigned long user_count = vma_pages(vma);
256 unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
257 unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr));
258 unsigned long off = vma->vm_pgoff;
260 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
262 if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
265 if (off < count && user_count <= (count - off)) {
266 ret = remap_pfn_range(vma, vma->vm_start,
268 user_count << PAGE_SHIFT,
271 #endif /* CONFIG_MMU && !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */
275 EXPORT_SYMBOL(dma_common_mmap);
279 * remaps an array of PAGE_SIZE pages into another vm_area
280 * Cannot be used in non-sleeping contexts
282 void *dma_common_pages_remap(struct page **pages, size_t size,
283 unsigned long vm_flags, pgprot_t prot,
286 struct vm_struct *area;
288 area = get_vm_area_caller(size, vm_flags, caller);
294 if (map_vm_area(area, prot, pages)) {
303 * remaps an allocated contiguous region into another vm_area.
304 * Cannot be used in non-sleeping contexts
307 void *dma_common_contiguous_remap(struct page *page, size_t size,
308 unsigned long vm_flags,
309 pgprot_t prot, const void *caller)
315 pages = kmalloc(sizeof(struct page *) << get_order(size), GFP_KERNEL);
319 for (i = 0; i < (size >> PAGE_SHIFT); i++)
320 pages[i] = nth_page(page, i);
322 ptr = dma_common_pages_remap(pages, size, vm_flags, prot, caller);
330 * unmaps a range previously mapped by dma_common_*_remap
332 void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags)
334 struct vm_struct *area = find_vm_area(cpu_addr);
336 if (!area || (area->flags & vm_flags) != vm_flags) {
337 WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr);
341 unmap_kernel_range((unsigned long)cpu_addr, PAGE_ALIGN(size));
347 * Common configuration to enable DMA API use for a device
349 #include <linux/pci.h>
351 int dma_configure(struct device *dev)
353 struct device *bridge = NULL, *dma_dev = dev;
354 enum dev_dma_attr attr;
357 if (dev_is_pci(dev)) {
358 bridge = pci_get_host_bridge_device(to_pci_dev(dev));
360 if (IS_ENABLED(CONFIG_OF) && dma_dev->parent &&
361 dma_dev->parent->of_node)
362 dma_dev = dma_dev->parent;
365 if (dma_dev->of_node) {
366 ret = of_dma_configure(dev, dma_dev->of_node);
367 } else if (has_acpi_companion(dma_dev)) {
368 attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode));
369 if (attr != DEV_DMA_NOT_SUPPORTED)
370 ret = acpi_dma_configure(dev, attr);
374 pci_put_host_bridge_device(bridge);
379 void dma_deconfigure(struct device *dev)
381 of_dma_deconfigure(dev);
382 acpi_dma_deconfigure(dev);