Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Russell King | 0ddbccd | 2008-09-25 15:59:19 +0100 | [diff] [blame] | 2 | * linux/arch/arm/mm/dma-mapping.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2000-2004 Russell King |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * DMA uncached mapping support. |
| 11 | */ |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/mm.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 14 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/errno.h> |
| 16 | #include <linux/list.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/device.h> |
| 19 | #include <linux/dma-mapping.h> |
Nicolas Pitre | 39af22a | 2010-12-15 15:14:45 -0500 | [diff] [blame] | 20 | #include <linux/highmem.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
Lennert Buytenhek | 23759dc | 2006-04-02 00:07:39 +0100 | [diff] [blame] | 22 | #include <asm/memory.h> |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 23 | #include <asm/highmem.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <asm/tlbflush.h> |
Kevin Hilman | 37134cd | 2006-01-12 16:12:21 +0000 | [diff] [blame] | 26 | #include <asm/sizes.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 28 | static u64 get_coherent_dma_mask(struct device *dev) |
| 29 | { |
| 30 | u64 mask = ISA_DMA_THRESHOLD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 32 | if (dev) { |
| 33 | mask = dev->coherent_dma_mask; |
| 34 | |
| 35 | /* |
| 36 | * Sanity check the DMA mask - it must be non-zero, and |
| 37 | * must be able to be satisfied by a DMA allocation. |
| 38 | */ |
| 39 | if (mask == 0) { |
| 40 | dev_warn(dev, "coherent DMA mask is unset\n"); |
| 41 | return 0; |
| 42 | } |
| 43 | |
| 44 | if ((~mask) & ISA_DMA_THRESHOLD) { |
| 45 | dev_warn(dev, "coherent DMA mask %#llx is smaller " |
| 46 | "than system GFP_DMA mask %#llx\n", |
| 47 | mask, (unsigned long long)ISA_DMA_THRESHOLD); |
| 48 | return 0; |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | return mask; |
| 53 | } |
| 54 | |
Russell King | 7a9a32a | 2009-11-19 15:31:07 +0000 | [diff] [blame] | 55 | /* |
| 56 | * Allocate a DMA buffer for 'dev' of size 'size' using the |
| 57 | * specified gfp mask. Note that 'size' must be page aligned. |
| 58 | */ |
| 59 | static struct page *__dma_alloc_buffer(struct device *dev, size_t size, gfp_t gfp) |
| 60 | { |
| 61 | unsigned long order = get_order(size); |
| 62 | struct page *page, *p, *e; |
| 63 | void *ptr; |
| 64 | u64 mask = get_coherent_dma_mask(dev); |
| 65 | |
| 66 | #ifdef CONFIG_DMA_API_DEBUG |
| 67 | u64 limit = (mask + 1) & ~mask; |
| 68 | if (limit && size >= limit) { |
| 69 | dev_warn(dev, "coherent allocation too big (requested %#x mask %#llx)\n", |
| 70 | size, mask); |
| 71 | return NULL; |
| 72 | } |
| 73 | #endif |
| 74 | |
| 75 | if (!mask) |
| 76 | return NULL; |
| 77 | |
| 78 | if (mask < 0xffffffffULL) |
| 79 | gfp |= GFP_DMA; |
| 80 | |
| 81 | page = alloc_pages(gfp, order); |
| 82 | if (!page) |
| 83 | return NULL; |
| 84 | |
| 85 | /* |
| 86 | * Now split the huge page and free the excess pages |
| 87 | */ |
| 88 | split_page(page, order); |
| 89 | for (p = page + (size >> PAGE_SHIFT), e = page + (1 << order); p < e; p++) |
| 90 | __free_page(p); |
| 91 | |
| 92 | /* |
| 93 | * Ensure that the allocated pages are zeroed, and that any data |
| 94 | * lurking in the kernel direct-mapped region is invalidated. |
| 95 | */ |
| 96 | ptr = page_address(page); |
| 97 | memset(ptr, 0, size); |
| 98 | dmac_flush_range(ptr, ptr + size); |
| 99 | outer_flush_range(__pa(ptr), __pa(ptr) + size); |
| 100 | |
| 101 | return page; |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Free a DMA buffer. 'size' must be page aligned. |
| 106 | */ |
| 107 | static void __dma_free_buffer(struct page *page, size_t size) |
| 108 | { |
| 109 | struct page *e = page + (size >> PAGE_SHIFT); |
| 110 | |
| 111 | while (page < e) { |
| 112 | __free_page(page); |
| 113 | page++; |
| 114 | } |
| 115 | } |
| 116 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 117 | #ifdef CONFIG_MMU |
Catalin Marinas | a5e9d38 | 2010-06-21 15:09:06 +0100 | [diff] [blame] | 118 | /* Sanity check size */ |
| 119 | #if (CONSISTENT_DMA_SIZE % SZ_2M) |
| 120 | #error "CONSISTENT_DMA_SIZE must be multiple of 2MiB" |
| 121 | #endif |
| 122 | |
| 123 | #define CONSISTENT_OFFSET(x) (((unsigned long)(x) - CONSISTENT_BASE) >> PAGE_SHIFT) |
| 124 | #define CONSISTENT_PTE_INDEX(x) (((unsigned long)(x) - CONSISTENT_BASE) >> PGDIR_SHIFT) |
| 125 | #define NUM_CONSISTENT_PTES (CONSISTENT_DMA_SIZE >> PGDIR_SHIFT) |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | /* |
Kevin Hilman | 37134cd | 2006-01-12 16:12:21 +0000 | [diff] [blame] | 128 | * These are the page tables (2MB each) covering uncached, DMA consistent allocations |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | */ |
Kevin Hilman | 37134cd | 2006-01-12 16:12:21 +0000 | [diff] [blame] | 130 | static pte_t *consistent_pte[NUM_CONSISTENT_PTES]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
Russell King | 13ccf3a | 2009-11-19 15:07:04 +0000 | [diff] [blame] | 132 | #include "vmregion.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
Russell King | 13ccf3a | 2009-11-19 15:07:04 +0000 | [diff] [blame] | 134 | static struct arm_vmregion_head consistent_head = { |
| 135 | .vm_lock = __SPIN_LOCK_UNLOCKED(&consistent_head.vm_lock), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | .vm_list = LIST_HEAD_INIT(consistent_head.vm_list), |
| 137 | .vm_start = CONSISTENT_BASE, |
| 138 | .vm_end = CONSISTENT_END, |
| 139 | }; |
| 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | #ifdef CONFIG_HUGETLB_PAGE |
| 142 | #error ARM Coherent DMA allocator does not (yet) support huge TLB |
| 143 | #endif |
| 144 | |
Russell King | 88c58f3 | 2009-11-19 16:46:02 +0000 | [diff] [blame] | 145 | /* |
| 146 | * Initialise the consistent memory allocation. |
| 147 | */ |
| 148 | static int __init consistent_init(void) |
| 149 | { |
| 150 | int ret = 0; |
| 151 | pgd_t *pgd; |
| 152 | pmd_t *pmd; |
| 153 | pte_t *pte; |
| 154 | int i = 0; |
| 155 | u32 base = CONSISTENT_BASE; |
| 156 | |
| 157 | do { |
| 158 | pgd = pgd_offset(&init_mm, base); |
| 159 | pmd = pmd_alloc(&init_mm, pgd, base); |
| 160 | if (!pmd) { |
| 161 | printk(KERN_ERR "%s: no pmd tables\n", __func__); |
| 162 | ret = -ENOMEM; |
| 163 | break; |
| 164 | } |
| 165 | WARN_ON(!pmd_none(*pmd)); |
| 166 | |
| 167 | pte = pte_alloc_kernel(pmd, base); |
| 168 | if (!pte) { |
| 169 | printk(KERN_ERR "%s: no pte tables\n", __func__); |
| 170 | ret = -ENOMEM; |
| 171 | break; |
| 172 | } |
| 173 | |
| 174 | consistent_pte[i++] = pte; |
| 175 | base += (1 << PGDIR_SHIFT); |
| 176 | } while (base < CONSISTENT_END); |
| 177 | |
| 178 | return ret; |
| 179 | } |
| 180 | |
| 181 | core_initcall(consistent_init); |
| 182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | static void * |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 184 | __dma_alloc_remap(struct page *page, size_t size, gfp_t gfp, pgprot_t prot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
Russell King | 13ccf3a | 2009-11-19 15:07:04 +0000 | [diff] [blame] | 186 | struct arm_vmregion *c; |
Russell King | 5bc23d3 | 2010-07-25 08:57:02 +0100 | [diff] [blame] | 187 | size_t align; |
| 188 | int bit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
Russell King | ebd7a84 | 2009-11-19 20:58:31 +0000 | [diff] [blame] | 190 | if (!consistent_pte[0]) { |
| 191 | printk(KERN_ERR "%s: not initialised\n", __func__); |
| 192 | dump_stack(); |
Russell King | ebd7a84 | 2009-11-19 20:58:31 +0000 | [diff] [blame] | 193 | return NULL; |
| 194 | } |
| 195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | /* |
Russell King | 5bc23d3 | 2010-07-25 08:57:02 +0100 | [diff] [blame] | 197 | * Align the virtual region allocation - maximum alignment is |
| 198 | * a section size, minimum is a page size. This helps reduce |
| 199 | * fragmentation of the DMA space, and also prevents allocations |
| 200 | * smaller than a section from crossing a section boundary. |
| 201 | */ |
Russell King | c947f69 | 2010-11-03 16:00:15 +0000 | [diff] [blame] | 202 | bit = fls(size - 1); |
Russell King | 5bc23d3 | 2010-07-25 08:57:02 +0100 | [diff] [blame] | 203 | if (bit > SECTION_SHIFT) |
| 204 | bit = SECTION_SHIFT; |
| 205 | align = 1 << bit; |
| 206 | |
| 207 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | * Allocate a virtual address in the consistent mapping region. |
| 209 | */ |
Russell King | 5bc23d3 | 2010-07-25 08:57:02 +0100 | [diff] [blame] | 210 | c = arm_vmregion_alloc(&consistent_head, align, size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | gfp & ~(__GFP_DMA | __GFP_HIGHMEM)); |
| 212 | if (c) { |
Kevin Hilman | 37134cd | 2006-01-12 16:12:21 +0000 | [diff] [blame] | 213 | pte_t *pte; |
Kevin Hilman | 37134cd | 2006-01-12 16:12:21 +0000 | [diff] [blame] | 214 | int idx = CONSISTENT_PTE_INDEX(c->vm_start); |
| 215 | u32 off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
Kevin Hilman | 37134cd | 2006-01-12 16:12:21 +0000 | [diff] [blame] | 217 | pte = consistent_pte[idx] + off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | c->vm_pages = page; |
| 219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | do { |
| 221 | BUG_ON(!pte_none(*pte)); |
| 222 | |
Russell King | ad1ae2f | 2006-12-13 14:34:43 +0000 | [diff] [blame] | 223 | set_pte_ext(pte, mk_pte(page, prot), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | page++; |
| 225 | pte++; |
Kevin Hilman | 37134cd | 2006-01-12 16:12:21 +0000 | [diff] [blame] | 226 | off++; |
| 227 | if (off >= PTRS_PER_PTE) { |
| 228 | off = 0; |
| 229 | pte = consistent_pte[++idx]; |
| 230 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | } while (size -= PAGE_SIZE); |
| 232 | |
Russell King | 2be23c4 | 2010-09-08 16:27:56 +0100 | [diff] [blame] | 233 | dsb(); |
| 234 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | return (void *)c->vm_start; |
| 236 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | return NULL; |
| 238 | } |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 239 | |
| 240 | static void __dma_free_remap(void *cpu_addr, size_t size) |
| 241 | { |
| 242 | struct arm_vmregion *c; |
| 243 | unsigned long addr; |
| 244 | pte_t *ptep; |
| 245 | int idx; |
| 246 | u32 off; |
| 247 | |
| 248 | c = arm_vmregion_find_remove(&consistent_head, (unsigned long)cpu_addr); |
| 249 | if (!c) { |
| 250 | printk(KERN_ERR "%s: trying to free invalid coherent area: %p\n", |
| 251 | __func__, cpu_addr); |
| 252 | dump_stack(); |
| 253 | return; |
| 254 | } |
| 255 | |
| 256 | if ((c->vm_end - c->vm_start) != size) { |
| 257 | printk(KERN_ERR "%s: freeing wrong coherent size (%ld != %d)\n", |
| 258 | __func__, c->vm_end - c->vm_start, size); |
| 259 | dump_stack(); |
| 260 | size = c->vm_end - c->vm_start; |
| 261 | } |
| 262 | |
| 263 | idx = CONSISTENT_PTE_INDEX(c->vm_start); |
| 264 | off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1); |
| 265 | ptep = consistent_pte[idx] + off; |
| 266 | addr = c->vm_start; |
| 267 | do { |
| 268 | pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep); |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 269 | |
| 270 | ptep++; |
| 271 | addr += PAGE_SIZE; |
| 272 | off++; |
| 273 | if (off >= PTRS_PER_PTE) { |
| 274 | off = 0; |
| 275 | ptep = consistent_pte[++idx]; |
| 276 | } |
| 277 | |
Russell King | acaac25 | 2009-11-20 18:19:52 +0000 | [diff] [blame] | 278 | if (pte_none(pte) || !pte_present(pte)) |
| 279 | printk(KERN_CRIT "%s: bad page in kernel page table\n", |
| 280 | __func__); |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 281 | } while (size -= PAGE_SIZE); |
| 282 | |
| 283 | flush_tlb_kernel_range(c->vm_start, c->vm_end); |
| 284 | |
| 285 | arm_vmregion_free(&consistent_head, c); |
| 286 | } |
| 287 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 288 | #else /* !CONFIG_MMU */ |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 289 | |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 290 | #define __dma_alloc_remap(page, size, gfp, prot) page_address(page) |
| 291 | #define __dma_free_remap(addr, size) do { } while (0) |
| 292 | |
| 293 | #endif /* CONFIG_MMU */ |
| 294 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 295 | static void * |
| 296 | __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp, |
| 297 | pgprot_t prot) |
| 298 | { |
Russell King | 04da569 | 2009-11-19 15:54:45 +0000 | [diff] [blame] | 299 | struct page *page; |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 300 | void *addr; |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 301 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 302 | *handle = ~0; |
Russell King | 04da569 | 2009-11-19 15:54:45 +0000 | [diff] [blame] | 303 | size = PAGE_ALIGN(size); |
| 304 | |
| 305 | page = __dma_alloc_buffer(dev, size, gfp); |
| 306 | if (!page) |
| 307 | return NULL; |
| 308 | |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 309 | if (!arch_is_coherent()) |
| 310 | addr = __dma_alloc_remap(page, size, gfp, prot); |
| 311 | else |
| 312 | addr = page_address(page); |
| 313 | |
| 314 | if (addr) |
Russell King | 9eedd96 | 2011-01-03 00:00:17 +0000 | [diff] [blame] | 315 | *handle = pfn_to_dma(dev, page_to_pfn(page)); |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 316 | |
| 317 | return addr; |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 318 | } |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | /* |
| 321 | * Allocate DMA-coherent memory space and return both the kernel remapped |
| 322 | * virtual and bus address for that space. |
| 323 | */ |
| 324 | void * |
Al Viro | f9e3214 | 2005-10-21 03:20:58 -0400 | [diff] [blame] | 325 | dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | { |
Dmitry Baryshkov | 1fe5326 | 2008-07-18 13:30:14 +0400 | [diff] [blame] | 327 | void *memory; |
| 328 | |
| 329 | if (dma_alloc_from_coherent(dev, size, handle, &memory)) |
| 330 | return memory; |
| 331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | return __dma_alloc(dev, size, handle, gfp, |
Russell King | 26a26d3 | 2009-11-20 21:06:43 +0000 | [diff] [blame] | 333 | pgprot_dmacoherent(pgprot_kernel)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | } |
| 335 | EXPORT_SYMBOL(dma_alloc_coherent); |
| 336 | |
| 337 | /* |
| 338 | * Allocate a writecombining region, in much the same way as |
| 339 | * dma_alloc_coherent above. |
| 340 | */ |
| 341 | void * |
Al Viro | f9e3214 | 2005-10-21 03:20:58 -0400 | [diff] [blame] | 342 | dma_alloc_writecombine(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | { |
| 344 | return __dma_alloc(dev, size, handle, gfp, |
| 345 | pgprot_writecombine(pgprot_kernel)); |
| 346 | } |
| 347 | EXPORT_SYMBOL(dma_alloc_writecombine); |
| 348 | |
| 349 | static int dma_mmap(struct device *dev, struct vm_area_struct *vma, |
| 350 | void *cpu_addr, dma_addr_t dma_addr, size_t size) |
| 351 | { |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 352 | int ret = -ENXIO; |
| 353 | #ifdef CONFIG_MMU |
Russell King | 13ccf3a | 2009-11-19 15:07:04 +0000 | [diff] [blame] | 354 | unsigned long user_size, kern_size; |
| 355 | struct arm_vmregion *c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
| 357 | user_size = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
| 358 | |
Russell King | 13ccf3a | 2009-11-19 15:07:04 +0000 | [diff] [blame] | 359 | c = arm_vmregion_find(&consistent_head, (unsigned long)cpu_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | if (c) { |
| 361 | unsigned long off = vma->vm_pgoff; |
| 362 | |
| 363 | kern_size = (c->vm_end - c->vm_start) >> PAGE_SHIFT; |
| 364 | |
| 365 | if (off < kern_size && |
| 366 | user_size <= (kern_size - off)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | ret = remap_pfn_range(vma, vma->vm_start, |
| 368 | page_to_pfn(c->vm_pages) + off, |
| 369 | user_size << PAGE_SHIFT, |
| 370 | vma->vm_page_prot); |
| 371 | } |
| 372 | } |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 373 | #endif /* CONFIG_MMU */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
| 375 | return ret; |
| 376 | } |
| 377 | |
| 378 | int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma, |
| 379 | void *cpu_addr, dma_addr_t dma_addr, size_t size) |
| 380 | { |
Russell King | 26a26d3 | 2009-11-20 21:06:43 +0000 | [diff] [blame] | 381 | vma->vm_page_prot = pgprot_dmacoherent(vma->vm_page_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | return dma_mmap(dev, vma, cpu_addr, dma_addr, size); |
| 383 | } |
| 384 | EXPORT_SYMBOL(dma_mmap_coherent); |
| 385 | |
| 386 | int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma, |
| 387 | void *cpu_addr, dma_addr_t dma_addr, size_t size) |
| 388 | { |
| 389 | vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); |
| 390 | return dma_mmap(dev, vma, cpu_addr, dma_addr, size); |
| 391 | } |
| 392 | EXPORT_SYMBOL(dma_mmap_writecombine); |
| 393 | |
| 394 | /* |
| 395 | * free a page as defined by the above mapping. |
Russell King | 5edf71a | 2005-11-25 15:52:51 +0000 | [diff] [blame] | 396 | * Must not be called with IRQs disabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | */ |
| 398 | void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle) |
| 399 | { |
Russell King | 5edf71a | 2005-11-25 15:52:51 +0000 | [diff] [blame] | 400 | WARN_ON(irqs_disabled()); |
| 401 | |
Dmitry Baryshkov | 1fe5326 | 2008-07-18 13:30:14 +0400 | [diff] [blame] | 402 | if (dma_release_from_coherent(dev, get_order(size), cpu_addr)) |
| 403 | return; |
| 404 | |
Russell King | 3e82d01 | 2009-11-19 15:38:12 +0000 | [diff] [blame] | 405 | size = PAGE_ALIGN(size); |
| 406 | |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 407 | if (!arch_is_coherent()) |
| 408 | __dma_free_remap(cpu_addr, size); |
Russell King | 7a9a32a | 2009-11-19 15:31:07 +0000 | [diff] [blame] | 409 | |
Russell King | 9eedd96 | 2011-01-03 00:00:17 +0000 | [diff] [blame] | 410 | __dma_free_buffer(pfn_to_page(dma_to_pfn(dev, handle)), size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | } |
| 412 | EXPORT_SYMBOL(dma_free_coherent); |
| 413 | |
| 414 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | * Make an area consistent for devices. |
Dan Williams | 105ef9a | 2006-11-21 22:57:23 +0100 | [diff] [blame] | 416 | * Note: Drivers should NOT use this function directly, as it will break |
| 417 | * platforms with CONFIG_DMABOUNCE. |
| 418 | * Use the driver DMA support - see dma-mapping.h (dma_sync_*) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | */ |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 420 | void ___dma_single_cpu_to_dev(const void *kaddr, size_t size, |
| 421 | enum dma_data_direction dir) |
| 422 | { |
Russell King | 2ffe2da | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 423 | unsigned long paddr; |
| 424 | |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 425 | BUG_ON(!virt_addr_valid(kaddr) || !virt_addr_valid(kaddr + size - 1)); |
| 426 | |
| 427 | dmac_map_area(kaddr, size, dir); |
Russell King | 2ffe2da | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 428 | |
| 429 | paddr = __pa(kaddr); |
| 430 | if (dir == DMA_FROM_DEVICE) { |
| 431 | outer_inv_range(paddr, paddr + size); |
| 432 | } else { |
| 433 | outer_clean_range(paddr, paddr + size); |
| 434 | } |
| 435 | /* FIXME: non-speculating: flush on bidirectional mappings? */ |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 436 | } |
| 437 | EXPORT_SYMBOL(___dma_single_cpu_to_dev); |
| 438 | |
| 439 | void ___dma_single_dev_to_cpu(const void *kaddr, size_t size, |
| 440 | enum dma_data_direction dir) |
| 441 | { |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 442 | BUG_ON(!virt_addr_valid(kaddr) || !virt_addr_valid(kaddr + size - 1)); |
| 443 | |
Russell King | 2ffe2da | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 444 | /* FIXME: non-speculating: not required */ |
| 445 | /* don't bother invalidating if DMA to device */ |
| 446 | if (dir != DMA_TO_DEVICE) { |
| 447 | unsigned long paddr = __pa(kaddr); |
| 448 | outer_inv_range(paddr, paddr + size); |
| 449 | } |
| 450 | |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 451 | dmac_unmap_area(kaddr, size, dir); |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 452 | } |
| 453 | EXPORT_SYMBOL(___dma_single_dev_to_cpu); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 454 | |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 455 | static void dma_cache_maint_page(struct page *page, unsigned long offset, |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 456 | size_t size, enum dma_data_direction dir, |
| 457 | void (*op)(const void *, size_t, int)) |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 458 | { |
| 459 | /* |
| 460 | * A single sg entry may refer to multiple physically contiguous |
| 461 | * pages. But we still need to process highmem pages individually. |
| 462 | * If highmem is not configured then the bulk of this loop gets |
| 463 | * optimized out. |
| 464 | */ |
| 465 | size_t left = size; |
| 466 | do { |
| 467 | size_t len = left; |
Russell King | 93f1d62 | 2009-11-24 14:41:01 +0000 | [diff] [blame] | 468 | void *vaddr; |
| 469 | |
| 470 | if (PageHighMem(page)) { |
| 471 | if (len + offset > PAGE_SIZE) { |
| 472 | if (offset >= PAGE_SIZE) { |
| 473 | page += offset / PAGE_SIZE; |
| 474 | offset %= PAGE_SIZE; |
| 475 | } |
| 476 | len = PAGE_SIZE - offset; |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 477 | } |
Russell King | 93f1d62 | 2009-11-24 14:41:01 +0000 | [diff] [blame] | 478 | vaddr = kmap_high_get(page); |
| 479 | if (vaddr) { |
| 480 | vaddr += offset; |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 481 | op(vaddr, len, dir); |
Russell King | 93f1d62 | 2009-11-24 14:41:01 +0000 | [diff] [blame] | 482 | kunmap_high(page); |
Nicolas Pitre | 7e5a69e | 2010-03-29 21:46:02 +0100 | [diff] [blame] | 483 | } else if (cache_is_vipt()) { |
Nicolas Pitre | 39af22a | 2010-12-15 15:14:45 -0500 | [diff] [blame] | 484 | /* unmapped pages might still be cached */ |
| 485 | vaddr = kmap_atomic(page); |
Nicolas Pitre | 7e5a69e | 2010-03-29 21:46:02 +0100 | [diff] [blame] | 486 | op(vaddr + offset, len, dir); |
Nicolas Pitre | 39af22a | 2010-12-15 15:14:45 -0500 | [diff] [blame] | 487 | kunmap_atomic(vaddr); |
Russell King | 93f1d62 | 2009-11-24 14:41:01 +0000 | [diff] [blame] | 488 | } |
| 489 | } else { |
| 490 | vaddr = page_address(page) + offset; |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 491 | op(vaddr, len, dir); |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 492 | } |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 493 | offset = 0; |
| 494 | page++; |
| 495 | left -= len; |
| 496 | } while (left); |
| 497 | } |
| 498 | |
| 499 | void ___dma_page_cpu_to_dev(struct page *page, unsigned long off, |
| 500 | size_t size, enum dma_data_direction dir) |
| 501 | { |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 502 | unsigned long paddr; |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 503 | |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 504 | dma_cache_maint_page(page, off, size, dir, dmac_map_area); |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 505 | |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 506 | paddr = page_to_phys(page) + off; |
Russell King | 2ffe2da | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 507 | if (dir == DMA_FROM_DEVICE) { |
| 508 | outer_inv_range(paddr, paddr + size); |
| 509 | } else { |
| 510 | outer_clean_range(paddr, paddr + size); |
| 511 | } |
| 512 | /* FIXME: non-speculating: flush on bidirectional mappings? */ |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 513 | } |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 514 | EXPORT_SYMBOL(___dma_page_cpu_to_dev); |
| 515 | |
| 516 | void ___dma_page_dev_to_cpu(struct page *page, unsigned long off, |
| 517 | size_t size, enum dma_data_direction dir) |
| 518 | { |
Russell King | 2ffe2da | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 519 | unsigned long paddr = page_to_phys(page) + off; |
| 520 | |
| 521 | /* FIXME: non-speculating: not required */ |
| 522 | /* don't bother invalidating if DMA to device */ |
| 523 | if (dir != DMA_TO_DEVICE) |
| 524 | outer_inv_range(paddr, paddr + size); |
| 525 | |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 526 | dma_cache_maint_page(page, off, size, dir, dmac_unmap_area); |
Catalin Marinas | c017780 | 2010-09-13 15:57:36 +0100 | [diff] [blame] | 527 | |
| 528 | /* |
| 529 | * Mark the D-cache clean for this page to avoid extra flushing. |
| 530 | */ |
| 531 | if (dir != DMA_TO_DEVICE && off == 0 && size >= PAGE_SIZE) |
| 532 | set_bit(PG_dcache_clean, &page->flags); |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 533 | } |
| 534 | EXPORT_SYMBOL(___dma_page_dev_to_cpu); |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 535 | |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 536 | /** |
| 537 | * dma_map_sg - map a set of SG buffers for streaming mode DMA |
| 538 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 539 | * @sg: list of buffers |
| 540 | * @nents: number of buffers to map |
| 541 | * @dir: DMA transfer direction |
| 542 | * |
| 543 | * Map a set of buffers described by scatterlist in streaming mode for DMA. |
| 544 | * This is the scatter-gather version of the dma_map_single interface. |
| 545 | * Here the scatter gather list elements are each tagged with the |
| 546 | * appropriate dma address and length. They are obtained via |
| 547 | * sg_dma_{address,length}. |
| 548 | * |
| 549 | * Device ownership issues as mentioned for dma_map_single are the same |
| 550 | * here. |
| 551 | */ |
| 552 | int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 553 | enum dma_data_direction dir) |
| 554 | { |
| 555 | struct scatterlist *s; |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 556 | int i, j; |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 557 | |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 558 | BUG_ON(!valid_dma_direction(dir)); |
| 559 | |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 560 | for_each_sg(sg, s, nents, i) { |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 561 | s->dma_address = __dma_map_page(dev, sg_page(s), s->offset, |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 562 | s->length, dir); |
| 563 | if (dma_mapping_error(dev, s->dma_address)) |
| 564 | goto bad_mapping; |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 565 | } |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 566 | debug_dma_map_sg(dev, sg, nents, nents, dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 567 | return nents; |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 568 | |
| 569 | bad_mapping: |
| 570 | for_each_sg(sg, s, i, j) |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 571 | __dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir); |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 572 | return 0; |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 573 | } |
| 574 | EXPORT_SYMBOL(dma_map_sg); |
| 575 | |
| 576 | /** |
| 577 | * dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg |
| 578 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 579 | * @sg: list of buffers |
Linus Walleij | 0adfca6 | 2011-01-12 18:50:37 +0100 | [diff] [blame^] | 580 | * @nents: number of buffers to unmap (same as was passed to dma_map_sg) |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 581 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
| 582 | * |
| 583 | * Unmap a set of streaming mode DMA translations. Again, CPU access |
| 584 | * rules concerning calls here are the same as for dma_unmap_single(). |
| 585 | */ |
| 586 | void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 587 | enum dma_data_direction dir) |
| 588 | { |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 589 | struct scatterlist *s; |
| 590 | int i; |
| 591 | |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 592 | debug_dma_unmap_sg(dev, sg, nents, dir); |
| 593 | |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 594 | for_each_sg(sg, s, nents, i) |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 595 | __dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 596 | } |
| 597 | EXPORT_SYMBOL(dma_unmap_sg); |
| 598 | |
| 599 | /** |
| 600 | * dma_sync_sg_for_cpu |
| 601 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 602 | * @sg: list of buffers |
| 603 | * @nents: number of buffers to map (returned from dma_map_sg) |
| 604 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
| 605 | */ |
| 606 | void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
| 607 | int nents, enum dma_data_direction dir) |
| 608 | { |
| 609 | struct scatterlist *s; |
| 610 | int i; |
| 611 | |
| 612 | for_each_sg(sg, s, nents, i) { |
Russell King | 18eabe2 | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 613 | if (!dmabounce_sync_for_cpu(dev, sg_dma_address(s), 0, |
| 614 | sg_dma_len(s), dir)) |
| 615 | continue; |
| 616 | |
| 617 | __dma_page_dev_to_cpu(sg_page(s), s->offset, |
| 618 | s->length, dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 619 | } |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 620 | |
| 621 | debug_dma_sync_sg_for_cpu(dev, sg, nents, dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 622 | } |
| 623 | EXPORT_SYMBOL(dma_sync_sg_for_cpu); |
| 624 | |
| 625 | /** |
| 626 | * dma_sync_sg_for_device |
| 627 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 628 | * @sg: list of buffers |
| 629 | * @nents: number of buffers to map (returned from dma_map_sg) |
| 630 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
| 631 | */ |
| 632 | void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, |
| 633 | int nents, enum dma_data_direction dir) |
| 634 | { |
| 635 | struct scatterlist *s; |
| 636 | int i; |
| 637 | |
| 638 | for_each_sg(sg, s, nents, i) { |
Russell King | 2638b4d | 2008-09-25 21:38:41 +0100 | [diff] [blame] | 639 | if (!dmabounce_sync_for_device(dev, sg_dma_address(s), 0, |
| 640 | sg_dma_len(s), dir)) |
| 641 | continue; |
| 642 | |
Russell King | 18eabe2 | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 643 | __dma_page_cpu_to_dev(sg_page(s), s->offset, |
| 644 | s->length, dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 645 | } |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 646 | |
| 647 | debug_dma_sync_sg_for_device(dev, sg, nents, dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 648 | } |
| 649 | EXPORT_SYMBOL(dma_sync_sg_for_device); |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 650 | |
| 651 | #define PREALLOC_DMA_DEBUG_ENTRIES 4096 |
| 652 | |
| 653 | static int __init dma_debug_do_init(void) |
| 654 | { |
| 655 | dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); |
| 656 | return 0; |
| 657 | } |
| 658 | fs_initcall(dma_debug_do_init); |