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; |
Russell King | 516295e | 2010-11-21 16:27:49 +0000 | [diff] [blame] | 152 | pud_t *pud; |
Russell King | 88c58f3 | 2009-11-19 16:46:02 +0000 | [diff] [blame] | 153 | pmd_t *pmd; |
| 154 | pte_t *pte; |
| 155 | int i = 0; |
| 156 | u32 base = CONSISTENT_BASE; |
| 157 | |
| 158 | do { |
| 159 | pgd = pgd_offset(&init_mm, base); |
Russell King | 516295e | 2010-11-21 16:27:49 +0000 | [diff] [blame] | 160 | |
| 161 | pud = pud_alloc(&init_mm, pgd, base); |
| 162 | if (!pud) { |
| 163 | printk(KERN_ERR "%s: no pud tables\n", __func__); |
| 164 | ret = -ENOMEM; |
| 165 | break; |
| 166 | } |
| 167 | |
| 168 | pmd = pmd_alloc(&init_mm, pud, base); |
Russell King | 88c58f3 | 2009-11-19 16:46:02 +0000 | [diff] [blame] | 169 | if (!pmd) { |
| 170 | printk(KERN_ERR "%s: no pmd tables\n", __func__); |
| 171 | ret = -ENOMEM; |
| 172 | break; |
| 173 | } |
| 174 | WARN_ON(!pmd_none(*pmd)); |
| 175 | |
| 176 | pte = pte_alloc_kernel(pmd, base); |
| 177 | if (!pte) { |
| 178 | printk(KERN_ERR "%s: no pte tables\n", __func__); |
| 179 | ret = -ENOMEM; |
| 180 | break; |
| 181 | } |
| 182 | |
| 183 | consistent_pte[i++] = pte; |
| 184 | base += (1 << PGDIR_SHIFT); |
| 185 | } while (base < CONSISTENT_END); |
| 186 | |
| 187 | return ret; |
| 188 | } |
| 189 | |
| 190 | core_initcall(consistent_init); |
| 191 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | static void * |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 193 | __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] | 194 | { |
Russell King | 13ccf3a | 2009-11-19 15:07:04 +0000 | [diff] [blame] | 195 | struct arm_vmregion *c; |
Russell King | 5bc23d3 | 2010-07-25 08:57:02 +0100 | [diff] [blame] | 196 | size_t align; |
| 197 | int bit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
Russell King | ebd7a84 | 2009-11-19 20:58:31 +0000 | [diff] [blame] | 199 | if (!consistent_pte[0]) { |
| 200 | printk(KERN_ERR "%s: not initialised\n", __func__); |
| 201 | dump_stack(); |
Russell King | ebd7a84 | 2009-11-19 20:58:31 +0000 | [diff] [blame] | 202 | return NULL; |
| 203 | } |
| 204 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | /* |
Russell King | 5bc23d3 | 2010-07-25 08:57:02 +0100 | [diff] [blame] | 206 | * Align the virtual region allocation - maximum alignment is |
| 207 | * a section size, minimum is a page size. This helps reduce |
| 208 | * fragmentation of the DMA space, and also prevents allocations |
| 209 | * smaller than a section from crossing a section boundary. |
| 210 | */ |
Russell King | c947f69 | 2010-11-03 16:00:15 +0000 | [diff] [blame] | 211 | bit = fls(size - 1); |
Russell King | 5bc23d3 | 2010-07-25 08:57:02 +0100 | [diff] [blame] | 212 | if (bit > SECTION_SHIFT) |
| 213 | bit = SECTION_SHIFT; |
| 214 | align = 1 << bit; |
| 215 | |
| 216 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | * Allocate a virtual address in the consistent mapping region. |
| 218 | */ |
Russell King | 5bc23d3 | 2010-07-25 08:57:02 +0100 | [diff] [blame] | 219 | c = arm_vmregion_alloc(&consistent_head, align, size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | gfp & ~(__GFP_DMA | __GFP_HIGHMEM)); |
| 221 | if (c) { |
Kevin Hilman | 37134cd | 2006-01-12 16:12:21 +0000 | [diff] [blame] | 222 | pte_t *pte; |
Kevin Hilman | 37134cd | 2006-01-12 16:12:21 +0000 | [diff] [blame] | 223 | int idx = CONSISTENT_PTE_INDEX(c->vm_start); |
| 224 | u32 off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
Kevin Hilman | 37134cd | 2006-01-12 16:12:21 +0000 | [diff] [blame] | 226 | pte = consistent_pte[idx] + off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | c->vm_pages = page; |
| 228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | do { |
| 230 | BUG_ON(!pte_none(*pte)); |
| 231 | |
Russell King | ad1ae2f | 2006-12-13 14:34:43 +0000 | [diff] [blame] | 232 | set_pte_ext(pte, mk_pte(page, prot), 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | page++; |
| 234 | pte++; |
Kevin Hilman | 37134cd | 2006-01-12 16:12:21 +0000 | [diff] [blame] | 235 | off++; |
| 236 | if (off >= PTRS_PER_PTE) { |
| 237 | off = 0; |
| 238 | pte = consistent_pte[++idx]; |
| 239 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | } while (size -= PAGE_SIZE); |
| 241 | |
Russell King | 2be23c4 | 2010-09-08 16:27:56 +0100 | [diff] [blame] | 242 | dsb(); |
| 243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | return (void *)c->vm_start; |
| 245 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | return NULL; |
| 247 | } |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 248 | |
| 249 | static void __dma_free_remap(void *cpu_addr, size_t size) |
| 250 | { |
| 251 | struct arm_vmregion *c; |
| 252 | unsigned long addr; |
| 253 | pte_t *ptep; |
| 254 | int idx; |
| 255 | u32 off; |
| 256 | |
| 257 | c = arm_vmregion_find_remove(&consistent_head, (unsigned long)cpu_addr); |
| 258 | if (!c) { |
| 259 | printk(KERN_ERR "%s: trying to free invalid coherent area: %p\n", |
| 260 | __func__, cpu_addr); |
| 261 | dump_stack(); |
| 262 | return; |
| 263 | } |
| 264 | |
| 265 | if ((c->vm_end - c->vm_start) != size) { |
| 266 | printk(KERN_ERR "%s: freeing wrong coherent size (%ld != %d)\n", |
| 267 | __func__, c->vm_end - c->vm_start, size); |
| 268 | dump_stack(); |
| 269 | size = c->vm_end - c->vm_start; |
| 270 | } |
| 271 | |
| 272 | idx = CONSISTENT_PTE_INDEX(c->vm_start); |
| 273 | off = CONSISTENT_OFFSET(c->vm_start) & (PTRS_PER_PTE-1); |
| 274 | ptep = consistent_pte[idx] + off; |
| 275 | addr = c->vm_start; |
| 276 | do { |
| 277 | pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep); |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 278 | |
| 279 | ptep++; |
| 280 | addr += PAGE_SIZE; |
| 281 | off++; |
| 282 | if (off >= PTRS_PER_PTE) { |
| 283 | off = 0; |
| 284 | ptep = consistent_pte[++idx]; |
| 285 | } |
| 286 | |
Russell King | acaac25 | 2009-11-20 18:19:52 +0000 | [diff] [blame] | 287 | if (pte_none(pte) || !pte_present(pte)) |
| 288 | printk(KERN_CRIT "%s: bad page in kernel page table\n", |
| 289 | __func__); |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 290 | } while (size -= PAGE_SIZE); |
| 291 | |
| 292 | flush_tlb_kernel_range(c->vm_start, c->vm_end); |
| 293 | |
| 294 | arm_vmregion_free(&consistent_head, c); |
| 295 | } |
| 296 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 297 | #else /* !CONFIG_MMU */ |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 298 | |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 299 | #define __dma_alloc_remap(page, size, gfp, prot) page_address(page) |
| 300 | #define __dma_free_remap(addr, size) do { } while (0) |
| 301 | |
| 302 | #endif /* CONFIG_MMU */ |
| 303 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 304 | static void * |
| 305 | __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp, |
| 306 | pgprot_t prot) |
| 307 | { |
Russell King | 04da569 | 2009-11-19 15:54:45 +0000 | [diff] [blame] | 308 | struct page *page; |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 309 | void *addr; |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 310 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 311 | *handle = ~0; |
Russell King | 04da569 | 2009-11-19 15:54:45 +0000 | [diff] [blame] | 312 | size = PAGE_ALIGN(size); |
| 313 | |
| 314 | page = __dma_alloc_buffer(dev, size, gfp); |
| 315 | if (!page) |
| 316 | return NULL; |
| 317 | |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 318 | if (!arch_is_coherent()) |
| 319 | addr = __dma_alloc_remap(page, size, gfp, prot); |
| 320 | else |
| 321 | addr = page_address(page); |
| 322 | |
| 323 | if (addr) |
Russell King | 9eedd96 | 2011-01-03 00:00:17 +0000 | [diff] [blame] | 324 | *handle = pfn_to_dma(dev, page_to_pfn(page)); |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 325 | |
| 326 | return addr; |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 327 | } |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | /* |
| 330 | * Allocate DMA-coherent memory space and return both the kernel remapped |
| 331 | * virtual and bus address for that space. |
| 332 | */ |
| 333 | void * |
Al Viro | f9e3214 | 2005-10-21 03:20:58 -0400 | [diff] [blame] | 334 | 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] | 335 | { |
Dmitry Baryshkov | 1fe5326 | 2008-07-18 13:30:14 +0400 | [diff] [blame] | 336 | void *memory; |
| 337 | |
| 338 | if (dma_alloc_from_coherent(dev, size, handle, &memory)) |
| 339 | return memory; |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | return __dma_alloc(dev, size, handle, gfp, |
Russell King | 26a26d3 | 2009-11-20 21:06:43 +0000 | [diff] [blame] | 342 | pgprot_dmacoherent(pgprot_kernel)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |
| 344 | EXPORT_SYMBOL(dma_alloc_coherent); |
| 345 | |
| 346 | /* |
| 347 | * Allocate a writecombining region, in much the same way as |
| 348 | * dma_alloc_coherent above. |
| 349 | */ |
| 350 | void * |
Al Viro | f9e3214 | 2005-10-21 03:20:58 -0400 | [diff] [blame] | 351 | 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] | 352 | { |
| 353 | return __dma_alloc(dev, size, handle, gfp, |
| 354 | pgprot_writecombine(pgprot_kernel)); |
| 355 | } |
| 356 | EXPORT_SYMBOL(dma_alloc_writecombine); |
| 357 | |
| 358 | static int dma_mmap(struct device *dev, struct vm_area_struct *vma, |
| 359 | void *cpu_addr, dma_addr_t dma_addr, size_t size) |
| 360 | { |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 361 | int ret = -ENXIO; |
| 362 | #ifdef CONFIG_MMU |
Russell King | 13ccf3a | 2009-11-19 15:07:04 +0000 | [diff] [blame] | 363 | unsigned long user_size, kern_size; |
| 364 | struct arm_vmregion *c; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
| 366 | user_size = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
| 367 | |
Russell King | 13ccf3a | 2009-11-19 15:07:04 +0000 | [diff] [blame] | 368 | c = arm_vmregion_find(&consistent_head, (unsigned long)cpu_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | if (c) { |
| 370 | unsigned long off = vma->vm_pgoff; |
| 371 | |
| 372 | kern_size = (c->vm_end - c->vm_start) >> PAGE_SHIFT; |
| 373 | |
| 374 | if (off < kern_size && |
| 375 | user_size <= (kern_size - off)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | ret = remap_pfn_range(vma, vma->vm_start, |
| 377 | page_to_pfn(c->vm_pages) + off, |
| 378 | user_size << PAGE_SHIFT, |
| 379 | vma->vm_page_prot); |
| 380 | } |
| 381 | } |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 382 | #endif /* CONFIG_MMU */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
| 384 | return ret; |
| 385 | } |
| 386 | |
| 387 | int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma, |
| 388 | void *cpu_addr, dma_addr_t dma_addr, size_t size) |
| 389 | { |
Russell King | 26a26d3 | 2009-11-20 21:06:43 +0000 | [diff] [blame] | 390 | vma->vm_page_prot = pgprot_dmacoherent(vma->vm_page_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | return dma_mmap(dev, vma, cpu_addr, dma_addr, size); |
| 392 | } |
| 393 | EXPORT_SYMBOL(dma_mmap_coherent); |
| 394 | |
| 395 | int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma, |
| 396 | void *cpu_addr, dma_addr_t dma_addr, size_t size) |
| 397 | { |
| 398 | vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); |
| 399 | return dma_mmap(dev, vma, cpu_addr, dma_addr, size); |
| 400 | } |
| 401 | EXPORT_SYMBOL(dma_mmap_writecombine); |
| 402 | |
| 403 | /* |
| 404 | * free a page as defined by the above mapping. |
Russell King | 5edf71a | 2005-11-25 15:52:51 +0000 | [diff] [blame] | 405 | * Must not be called with IRQs disabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | */ |
| 407 | void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle) |
| 408 | { |
Russell King | 5edf71a | 2005-11-25 15:52:51 +0000 | [diff] [blame] | 409 | WARN_ON(irqs_disabled()); |
| 410 | |
Dmitry Baryshkov | 1fe5326 | 2008-07-18 13:30:14 +0400 | [diff] [blame] | 411 | if (dma_release_from_coherent(dev, get_order(size), cpu_addr)) |
| 412 | return; |
| 413 | |
Russell King | 3e82d01 | 2009-11-19 15:38:12 +0000 | [diff] [blame] | 414 | size = PAGE_ALIGN(size); |
| 415 | |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 416 | if (!arch_is_coherent()) |
| 417 | __dma_free_remap(cpu_addr, size); |
Russell King | 7a9a32a | 2009-11-19 15:31:07 +0000 | [diff] [blame] | 418 | |
Russell King | 9eedd96 | 2011-01-03 00:00:17 +0000 | [diff] [blame] | 419 | __dma_free_buffer(pfn_to_page(dma_to_pfn(dev, handle)), size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
| 421 | EXPORT_SYMBOL(dma_free_coherent); |
| 422 | |
| 423 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | * Make an area consistent for devices. |
Dan Williams | 105ef9a | 2006-11-21 22:57:23 +0100 | [diff] [blame] | 425 | * Note: Drivers should NOT use this function directly, as it will break |
| 426 | * platforms with CONFIG_DMABOUNCE. |
| 427 | * Use the driver DMA support - see dma-mapping.h (dma_sync_*) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | */ |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 429 | void ___dma_single_cpu_to_dev(const void *kaddr, size_t size, |
| 430 | enum dma_data_direction dir) |
| 431 | { |
Russell King | 2ffe2da | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 432 | unsigned long paddr; |
| 433 | |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 434 | BUG_ON(!virt_addr_valid(kaddr) || !virt_addr_valid(kaddr + size - 1)); |
| 435 | |
| 436 | dmac_map_area(kaddr, size, dir); |
Russell King | 2ffe2da | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 437 | |
| 438 | paddr = __pa(kaddr); |
| 439 | if (dir == DMA_FROM_DEVICE) { |
| 440 | outer_inv_range(paddr, paddr + size); |
| 441 | } else { |
| 442 | outer_clean_range(paddr, paddr + size); |
| 443 | } |
| 444 | /* FIXME: non-speculating: flush on bidirectional mappings? */ |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 445 | } |
| 446 | EXPORT_SYMBOL(___dma_single_cpu_to_dev); |
| 447 | |
| 448 | void ___dma_single_dev_to_cpu(const void *kaddr, size_t size, |
| 449 | enum dma_data_direction dir) |
| 450 | { |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 451 | BUG_ON(!virt_addr_valid(kaddr) || !virt_addr_valid(kaddr + size - 1)); |
| 452 | |
Russell King | 2ffe2da | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 453 | /* FIXME: non-speculating: not required */ |
| 454 | /* don't bother invalidating if DMA to device */ |
| 455 | if (dir != DMA_TO_DEVICE) { |
| 456 | unsigned long paddr = __pa(kaddr); |
| 457 | outer_inv_range(paddr, paddr + size); |
| 458 | } |
| 459 | |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 460 | dmac_unmap_area(kaddr, size, dir); |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 461 | } |
| 462 | EXPORT_SYMBOL(___dma_single_dev_to_cpu); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 463 | |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 464 | static void dma_cache_maint_page(struct page *page, unsigned long offset, |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 465 | size_t size, enum dma_data_direction dir, |
| 466 | void (*op)(const void *, size_t, int)) |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 467 | { |
| 468 | /* |
| 469 | * A single sg entry may refer to multiple physically contiguous |
| 470 | * pages. But we still need to process highmem pages individually. |
| 471 | * If highmem is not configured then the bulk of this loop gets |
| 472 | * optimized out. |
| 473 | */ |
| 474 | size_t left = size; |
| 475 | do { |
| 476 | size_t len = left; |
Russell King | 93f1d62 | 2009-11-24 14:41:01 +0000 | [diff] [blame] | 477 | void *vaddr; |
| 478 | |
| 479 | if (PageHighMem(page)) { |
| 480 | if (len + offset > PAGE_SIZE) { |
| 481 | if (offset >= PAGE_SIZE) { |
| 482 | page += offset / PAGE_SIZE; |
| 483 | offset %= PAGE_SIZE; |
| 484 | } |
| 485 | len = PAGE_SIZE - offset; |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 486 | } |
Russell King | 93f1d62 | 2009-11-24 14:41:01 +0000 | [diff] [blame] | 487 | vaddr = kmap_high_get(page); |
| 488 | if (vaddr) { |
| 489 | vaddr += offset; |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 490 | op(vaddr, len, dir); |
Russell King | 93f1d62 | 2009-11-24 14:41:01 +0000 | [diff] [blame] | 491 | kunmap_high(page); |
Nicolas Pitre | 7e5a69e | 2010-03-29 21:46:02 +0100 | [diff] [blame] | 492 | } else if (cache_is_vipt()) { |
Nicolas Pitre | 39af22a | 2010-12-15 15:14:45 -0500 | [diff] [blame] | 493 | /* unmapped pages might still be cached */ |
| 494 | vaddr = kmap_atomic(page); |
Nicolas Pitre | 7e5a69e | 2010-03-29 21:46:02 +0100 | [diff] [blame] | 495 | op(vaddr + offset, len, dir); |
Nicolas Pitre | 39af22a | 2010-12-15 15:14:45 -0500 | [diff] [blame] | 496 | kunmap_atomic(vaddr); |
Russell King | 93f1d62 | 2009-11-24 14:41:01 +0000 | [diff] [blame] | 497 | } |
| 498 | } else { |
| 499 | vaddr = page_address(page) + offset; |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 500 | op(vaddr, len, dir); |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 501 | } |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 502 | offset = 0; |
| 503 | page++; |
| 504 | left -= len; |
| 505 | } while (left); |
| 506 | } |
| 507 | |
| 508 | void ___dma_page_cpu_to_dev(struct page *page, unsigned long off, |
| 509 | size_t size, enum dma_data_direction dir) |
| 510 | { |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 511 | unsigned long paddr; |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 512 | |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 513 | dma_cache_maint_page(page, off, size, dir, dmac_map_area); |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 514 | |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 515 | paddr = page_to_phys(page) + off; |
Russell King | 2ffe2da | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 516 | if (dir == DMA_FROM_DEVICE) { |
| 517 | outer_inv_range(paddr, paddr + size); |
| 518 | } else { |
| 519 | outer_clean_range(paddr, paddr + size); |
| 520 | } |
| 521 | /* FIXME: non-speculating: flush on bidirectional mappings? */ |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 522 | } |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 523 | EXPORT_SYMBOL(___dma_page_cpu_to_dev); |
| 524 | |
| 525 | void ___dma_page_dev_to_cpu(struct page *page, unsigned long off, |
| 526 | size_t size, enum dma_data_direction dir) |
| 527 | { |
Russell King | 2ffe2da | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 528 | unsigned long paddr = page_to_phys(page) + off; |
| 529 | |
| 530 | /* FIXME: non-speculating: not required */ |
| 531 | /* don't bother invalidating if DMA to device */ |
| 532 | if (dir != DMA_TO_DEVICE) |
| 533 | outer_inv_range(paddr, paddr + size); |
| 534 | |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 535 | dma_cache_maint_page(page, off, size, dir, dmac_unmap_area); |
Catalin Marinas | c017780 | 2010-09-13 15:57:36 +0100 | [diff] [blame] | 536 | |
| 537 | /* |
| 538 | * Mark the D-cache clean for this page to avoid extra flushing. |
| 539 | */ |
| 540 | if (dir != DMA_TO_DEVICE && off == 0 && size >= PAGE_SIZE) |
| 541 | set_bit(PG_dcache_clean, &page->flags); |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 542 | } |
| 543 | EXPORT_SYMBOL(___dma_page_dev_to_cpu); |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 544 | |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 545 | /** |
| 546 | * dma_map_sg - map a set of SG buffers for streaming mode DMA |
| 547 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 548 | * @sg: list of buffers |
| 549 | * @nents: number of buffers to map |
| 550 | * @dir: DMA transfer direction |
| 551 | * |
| 552 | * Map a set of buffers described by scatterlist in streaming mode for DMA. |
| 553 | * This is the scatter-gather version of the dma_map_single interface. |
| 554 | * Here the scatter gather list elements are each tagged with the |
| 555 | * appropriate dma address and length. They are obtained via |
| 556 | * sg_dma_{address,length}. |
| 557 | * |
| 558 | * Device ownership issues as mentioned for dma_map_single are the same |
| 559 | * here. |
| 560 | */ |
| 561 | int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 562 | enum dma_data_direction dir) |
| 563 | { |
| 564 | struct scatterlist *s; |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 565 | int i, j; |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 566 | |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 567 | BUG_ON(!valid_dma_direction(dir)); |
| 568 | |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 569 | for_each_sg(sg, s, nents, i) { |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 570 | s->dma_address = __dma_map_page(dev, sg_page(s), s->offset, |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 571 | s->length, dir); |
| 572 | if (dma_mapping_error(dev, s->dma_address)) |
| 573 | goto bad_mapping; |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 574 | } |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 575 | debug_dma_map_sg(dev, sg, nents, nents, dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 576 | return nents; |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 577 | |
| 578 | bad_mapping: |
| 579 | for_each_sg(sg, s, i, j) |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 580 | __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] | 581 | return 0; |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 582 | } |
| 583 | EXPORT_SYMBOL(dma_map_sg); |
| 584 | |
| 585 | /** |
| 586 | * dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg |
| 587 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 588 | * @sg: list of buffers |
Linus Walleij | 0adfca6 | 2011-01-12 18:50:37 +0100 | [diff] [blame] | 589 | * @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] | 590 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
| 591 | * |
| 592 | * Unmap a set of streaming mode DMA translations. Again, CPU access |
| 593 | * rules concerning calls here are the same as for dma_unmap_single(). |
| 594 | */ |
| 595 | void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 596 | enum dma_data_direction dir) |
| 597 | { |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 598 | struct scatterlist *s; |
| 599 | int i; |
| 600 | |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 601 | debug_dma_unmap_sg(dev, sg, nents, dir); |
| 602 | |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 603 | for_each_sg(sg, s, nents, i) |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 604 | __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] | 605 | } |
| 606 | EXPORT_SYMBOL(dma_unmap_sg); |
| 607 | |
| 608 | /** |
| 609 | * dma_sync_sg_for_cpu |
| 610 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 611 | * @sg: list of buffers |
| 612 | * @nents: number of buffers to map (returned from dma_map_sg) |
| 613 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
| 614 | */ |
| 615 | void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
| 616 | int nents, enum dma_data_direction dir) |
| 617 | { |
| 618 | struct scatterlist *s; |
| 619 | int i; |
| 620 | |
| 621 | for_each_sg(sg, s, nents, i) { |
Russell King | 18eabe2 | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 622 | if (!dmabounce_sync_for_cpu(dev, sg_dma_address(s), 0, |
| 623 | sg_dma_len(s), dir)) |
| 624 | continue; |
| 625 | |
| 626 | __dma_page_dev_to_cpu(sg_page(s), s->offset, |
| 627 | s->length, dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 628 | } |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 629 | |
| 630 | debug_dma_sync_sg_for_cpu(dev, sg, nents, dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 631 | } |
| 632 | EXPORT_SYMBOL(dma_sync_sg_for_cpu); |
| 633 | |
| 634 | /** |
| 635 | * dma_sync_sg_for_device |
| 636 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 637 | * @sg: list of buffers |
| 638 | * @nents: number of buffers to map (returned from dma_map_sg) |
| 639 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
| 640 | */ |
| 641 | void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, |
| 642 | int nents, enum dma_data_direction dir) |
| 643 | { |
| 644 | struct scatterlist *s; |
| 645 | int i; |
| 646 | |
| 647 | for_each_sg(sg, s, nents, i) { |
Russell King | 2638b4d | 2008-09-25 21:38:41 +0100 | [diff] [blame] | 648 | if (!dmabounce_sync_for_device(dev, sg_dma_address(s), 0, |
| 649 | sg_dma_len(s), dir)) |
| 650 | continue; |
| 651 | |
Russell King | 18eabe2 | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 652 | __dma_page_cpu_to_dev(sg_page(s), s->offset, |
| 653 | s->length, dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 654 | } |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 655 | |
| 656 | debug_dma_sync_sg_for_device(dev, sg, nents, dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 657 | } |
| 658 | EXPORT_SYMBOL(dma_sync_sg_for_device); |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 659 | |
| 660 | #define PREALLOC_DMA_DEBUG_ENTRIES 4096 |
| 661 | |
| 662 | static int __init dma_debug_do_init(void) |
| 663 | { |
| 664 | dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); |
| 665 | return 0; |
| 666 | } |
| 667 | fs_initcall(dma_debug_do_init); |