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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Russell King0ddbccd2008-09-25 15:59:19 +01002 * linux/arch/arm/mm/dma-mapping.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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 */
Russell King11a5aa32013-11-25 21:52:25 +000012#include <linux/bootmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/module.h>
14#include <linux/mm.h>
Laura Abbott36d0fd22014-10-09 15:26:42 -070015#include <linux/genalloc.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/errno.h>
18#include <linux/list.h>
19#include <linux/init.h>
20#include <linux/device.h>
21#include <linux/dma-mapping.h>
Marek Szyprowskic7909502011-12-29 13:09:51 +010022#include <linux/dma-contiguous.h>
Nicolas Pitre39af22a2010-12-15 15:14:45 -050023#include <linux/highmem.h>
Marek Szyprowskic7909502011-12-29 13:09:51 +010024#include <linux/memblock.h>
Jon Medhurst99d17172011-08-02 17:28:27 +010025#include <linux/slab.h>
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +020026#include <linux/iommu.h>
Marek Szyprowskie9da6e92012-07-30 09:11:33 +020027#include <linux/io.h>
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +020028#include <linux/vmalloc.h>
Alessandro Rubini158e8bf2012-06-24 12:46:26 +010029#include <linux/sizes.h>
Joonsoo Kima2541292014-08-06 16:05:25 -070030#include <linux/cma.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
Lennert Buytenhek23759dc2006-04-02 00:07:39 +010032#include <asm/memory.h>
Nicolas Pitre43377452009-03-12 22:52:09 -040033#include <asm/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <asm/cacheflush.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <asm/tlbflush.h>
Jon Medhurst99d17172011-08-02 17:28:27 +010036#include <asm/mach/arch.h>
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +020037#include <asm/dma-iommu.h>
Marek Szyprowskic7909502011-12-29 13:09:51 +010038#include <asm/mach/map.h>
39#include <asm/system_info.h>
40#include <asm/dma-contiguous.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Russell King1234e3f2015-07-24 09:10:55 +010042#include "dma.h"
Russell King022ae532011-07-08 21:26:59 +010043#include "mm.h"
44
Marek Szyprowski15237e12012-02-10 19:55:20 +010045/*
46 * The DMA API is built upon the notion of "buffer ownership". A buffer
47 * is either exclusively owned by the CPU (and therefore may be accessed
48 * by it) or exclusively owned by the DMA device. These helper functions
49 * represent the transitions between these two ownership states.
50 *
51 * Note, however, that on later ARMs, this notion does not work due to
52 * speculative prefetches. We model our approach on the assumption that
53 * the CPU does do speculative prefetches, which means we clean caches
54 * before transfers and delay cache invalidation until transfer completion.
55 *
Marek Szyprowski15237e12012-02-10 19:55:20 +010056 */
Marek Szyprowski51fde3492012-02-10 19:55:20 +010057static void __dma_page_cpu_to_dev(struct page *, unsigned long,
Marek Szyprowski15237e12012-02-10 19:55:20 +010058 size_t, enum dma_data_direction);
Marek Szyprowski51fde3492012-02-10 19:55:20 +010059static void __dma_page_dev_to_cpu(struct page *, unsigned long,
Marek Szyprowski15237e12012-02-10 19:55:20 +010060 size_t, enum dma_data_direction);
61
Marek Szyprowski2dc6a012012-02-10 19:55:20 +010062/**
63 * arm_dma_map_page - map a portion of a page for streaming DMA
64 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
65 * @page: page that buffer resides in
66 * @offset: offset into page for start of buffer
67 * @size: size of buffer to map
68 * @dir: DMA transfer direction
69 *
70 * Ensure that any data held in the cache is appropriately discarded
71 * or written back.
72 *
73 * The device owns this memory once this call has completed. The CPU
74 * can regain ownership by calling dma_unmap_page().
75 */
Marek Szyprowski51fde3492012-02-10 19:55:20 +010076static dma_addr_t arm_dma_map_page(struct device *dev, struct page *page,
Marek Szyprowski2dc6a012012-02-10 19:55:20 +010077 unsigned long offset, size_t size, enum dma_data_direction dir,
78 struct dma_attrs *attrs)
79{
Rob Herringdd37e942012-08-21 12:20:17 +020080 if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
Marek Szyprowski51fde3492012-02-10 19:55:20 +010081 __dma_page_cpu_to_dev(page, offset, size, dir);
82 return pfn_to_dma(dev, page_to_pfn(page)) + offset;
Marek Szyprowski2dc6a012012-02-10 19:55:20 +010083}
84
Rob Herringdd37e942012-08-21 12:20:17 +020085static dma_addr_t arm_coherent_dma_map_page(struct device *dev, struct page *page,
86 unsigned long offset, size_t size, enum dma_data_direction dir,
87 struct dma_attrs *attrs)
88{
89 return pfn_to_dma(dev, page_to_pfn(page)) + offset;
90}
91
Marek Szyprowski2dc6a012012-02-10 19:55:20 +010092/**
93 * arm_dma_unmap_page - unmap a buffer previously mapped through dma_map_page()
94 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
95 * @handle: DMA address of buffer
96 * @size: size of buffer (same as passed to dma_map_page)
97 * @dir: DMA transfer direction (same as passed to dma_map_page)
98 *
99 * Unmap a page streaming mode DMA translation. The handle and size
100 * must match what was provided in the previous dma_map_page() call.
101 * All other usages are undefined.
102 *
103 * After this call, reads by the CPU to the buffer are guaranteed to see
104 * whatever the device wrote there.
105 */
Marek Szyprowski51fde3492012-02-10 19:55:20 +0100106static void arm_dma_unmap_page(struct device *dev, dma_addr_t handle,
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100107 size_t size, enum dma_data_direction dir,
108 struct dma_attrs *attrs)
109{
Rob Herringdd37e942012-08-21 12:20:17 +0200110 if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
Marek Szyprowski51fde3492012-02-10 19:55:20 +0100111 __dma_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, handle)),
112 handle & ~PAGE_MASK, size, dir);
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100113}
114
Marek Szyprowski51fde3492012-02-10 19:55:20 +0100115static void arm_dma_sync_single_for_cpu(struct device *dev,
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100116 dma_addr_t handle, size_t size, enum dma_data_direction dir)
117{
118 unsigned int offset = handle & (PAGE_SIZE - 1);
119 struct page *page = pfn_to_page(dma_to_pfn(dev, handle-offset));
Rob Herringdd37e942012-08-21 12:20:17 +0200120 __dma_page_dev_to_cpu(page, offset, size, dir);
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100121}
122
Marek Szyprowski51fde3492012-02-10 19:55:20 +0100123static void arm_dma_sync_single_for_device(struct device *dev,
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100124 dma_addr_t handle, size_t size, enum dma_data_direction dir)
125{
126 unsigned int offset = handle & (PAGE_SIZE - 1);
127 struct page *page = pfn_to_page(dma_to_pfn(dev, handle-offset));
Rob Herringdd37e942012-08-21 12:20:17 +0200128 __dma_page_cpu_to_dev(page, offset, size, dir);
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100129}
130
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100131struct dma_map_ops arm_dma_ops = {
Marek Szyprowskif99d6032012-05-16 18:31:23 +0200132 .alloc = arm_dma_alloc,
133 .free = arm_dma_free,
134 .mmap = arm_dma_mmap,
Marek Szyprowskidc2832e2012-06-13 10:01:15 +0200135 .get_sgtable = arm_dma_get_sgtable,
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100136 .map_page = arm_dma_map_page,
137 .unmap_page = arm_dma_unmap_page,
138 .map_sg = arm_dma_map_sg,
139 .unmap_sg = arm_dma_unmap_sg,
140 .sync_single_for_cpu = arm_dma_sync_single_for_cpu,
141 .sync_single_for_device = arm_dma_sync_single_for_device,
142 .sync_sg_for_cpu = arm_dma_sync_sg_for_cpu,
143 .sync_sg_for_device = arm_dma_sync_sg_for_device,
144 .set_dma_mask = arm_dma_set_mask,
145};
146EXPORT_SYMBOL(arm_dma_ops);
147
Rob Herringdd37e942012-08-21 12:20:17 +0200148static void *arm_coherent_dma_alloc(struct device *dev, size_t size,
149 dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs);
150static void arm_coherent_dma_free(struct device *dev, size_t size, void *cpu_addr,
151 dma_addr_t handle, struct dma_attrs *attrs);
Mike Looijmans55af8a92015-06-03 11:25:31 +0100152static int arm_coherent_dma_mmap(struct device *dev, struct vm_area_struct *vma,
153 void *cpu_addr, dma_addr_t dma_addr, size_t size,
154 struct dma_attrs *attrs);
Rob Herringdd37e942012-08-21 12:20:17 +0200155
156struct dma_map_ops arm_coherent_dma_ops = {
157 .alloc = arm_coherent_dma_alloc,
158 .free = arm_coherent_dma_free,
Mike Looijmans55af8a92015-06-03 11:25:31 +0100159 .mmap = arm_coherent_dma_mmap,
Rob Herringdd37e942012-08-21 12:20:17 +0200160 .get_sgtable = arm_dma_get_sgtable,
161 .map_page = arm_coherent_dma_map_page,
162 .map_sg = arm_dma_map_sg,
163 .set_dma_mask = arm_dma_set_mask,
164};
165EXPORT_SYMBOL(arm_coherent_dma_ops);
166
Russell King9f28cde2013-12-06 12:30:42 +0000167static int __dma_supported(struct device *dev, u64 mask, bool warn)
168{
169 unsigned long max_dma_pfn;
170
171 /*
172 * If the mask allows for more memory than we can address,
173 * and we actually have that much memory, then we must
174 * indicate that DMA to this device is not supported.
175 */
176 if (sizeof(mask) != sizeof(dma_addr_t) &&
177 mask > (dma_addr_t)~0 &&
Russell King8bf12682015-03-10 16:41:35 +0000178 dma_to_pfn(dev, ~0) < max_pfn - 1) {
Russell King9f28cde2013-12-06 12:30:42 +0000179 if (warn) {
180 dev_warn(dev, "Coherent DMA mask %#llx is larger than dma_addr_t allows\n",
181 mask);
182 dev_warn(dev, "Driver did not use or check the return value from dma_set_coherent_mask()?\n");
183 }
184 return 0;
185 }
186
187 max_dma_pfn = min(max_pfn, arm_dma_pfn_limit);
188
189 /*
190 * Translate the device's DMA mask to a PFN limit. This
191 * PFN number includes the page which we can DMA to.
192 */
193 if (dma_to_pfn(dev, mask) < max_dma_pfn) {
194 if (warn)
195 dev_warn(dev, "Coherent DMA mask %#llx (pfn %#lx-%#lx) covers a smaller range of system memory than the DMA zone pfn 0x0-%#lx\n",
196 mask,
197 dma_to_pfn(dev, 0), dma_to_pfn(dev, mask) + 1,
198 max_dma_pfn + 1);
199 return 0;
200 }
201
202 return 1;
203}
204
Catalin Marinasab6494f2009-07-24 12:35:02 +0100205static u64 get_coherent_dma_mask(struct device *dev)
206{
Russell King4dcfa602013-07-09 12:14:49 +0100207 u64 mask = (u64)DMA_BIT_MASK(32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Catalin Marinasab6494f2009-07-24 12:35:02 +0100209 if (dev) {
210 mask = dev->coherent_dma_mask;
211
212 /*
213 * Sanity check the DMA mask - it must be non-zero, and
214 * must be able to be satisfied by a DMA allocation.
215 */
216 if (mask == 0) {
217 dev_warn(dev, "coherent DMA mask is unset\n");
218 return 0;
219 }
220
Russell King9f28cde2013-12-06 12:30:42 +0000221 if (!__dma_supported(dev, mask, true))
Russell King4dcfa602013-07-09 12:14:49 +0100222 return 0;
Catalin Marinasab6494f2009-07-24 12:35:02 +0100223 }
224
225 return mask;
226}
227
Marek Szyprowskic7909502011-12-29 13:09:51 +0100228static void __dma_clear_buffer(struct page *page, size_t size)
229{
Marek Szyprowskic7909502011-12-29 13:09:51 +0100230 /*
231 * Ensure that the allocated pages are zeroed, and that any data
232 * lurking in the kernel direct-mapped region is invalidated.
233 */
Marek Szyprowski9848e482013-01-16 15:38:44 +0100234 if (PageHighMem(page)) {
235 phys_addr_t base = __pfn_to_phys(page_to_pfn(page));
236 phys_addr_t end = base + size;
237 while (size > 0) {
238 void *ptr = kmap_atomic(page);
239 memset(ptr, 0, PAGE_SIZE);
240 dmac_flush_range(ptr, ptr + PAGE_SIZE);
241 kunmap_atomic(ptr);
242 page++;
243 size -= PAGE_SIZE;
244 }
245 outer_flush_range(base, end);
246 } else {
247 void *ptr = page_address(page);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +0200248 memset(ptr, 0, size);
249 dmac_flush_range(ptr, ptr + size);
250 outer_flush_range(__pa(ptr), __pa(ptr) + size);
251 }
Marek Szyprowskic7909502011-12-29 13:09:51 +0100252}
253
Russell King7a9a32a2009-11-19 15:31:07 +0000254/*
255 * Allocate a DMA buffer for 'dev' of size 'size' using the
256 * specified gfp mask. Note that 'size' must be page aligned.
257 */
258static struct page *__dma_alloc_buffer(struct device *dev, size_t size, gfp_t gfp)
259{
260 unsigned long order = get_order(size);
261 struct page *page, *p, *e;
Russell King7a9a32a2009-11-19 15:31:07 +0000262
263 page = alloc_pages(gfp, order);
264 if (!page)
265 return NULL;
266
267 /*
268 * Now split the huge page and free the excess pages
269 */
270 split_page(page, order);
271 for (p = page + (size >> PAGE_SHIFT), e = page + (1 << order); p < e; p++)
272 __free_page(p);
273
Marek Szyprowskic7909502011-12-29 13:09:51 +0100274 __dma_clear_buffer(page, size);
Russell King7a9a32a2009-11-19 15:31:07 +0000275
276 return page;
277}
278
279/*
280 * Free a DMA buffer. 'size' must be page aligned.
281 */
282static void __dma_free_buffer(struct page *page, size_t size)
283{
284 struct page *e = page + (size >> PAGE_SHIFT);
285
286 while (page < e) {
287 __free_page(page);
288 page++;
289 }
290}
291
Catalin Marinasab6494f2009-07-24 12:35:02 +0100292#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
Marek Szyprowskic7909502011-12-29 13:09:51 +0100294static void *__alloc_from_contiguous(struct device *dev, size_t size,
Marek Szyprowski9848e482013-01-16 15:38:44 +0100295 pgprot_t prot, struct page **ret_page,
Carlo Caione6e8266e2015-02-09 10:38:35 +0100296 const void *caller, bool want_vaddr);
Marek Szyprowskic7909502011-12-29 13:09:51 +0100297
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200298static void *__alloc_remap_buffer(struct device *dev, size_t size, gfp_t gfp,
299 pgprot_t prot, struct page **ret_page,
Carlo Caione6e8266e2015-02-09 10:38:35 +0100300 const void *caller, bool want_vaddr);
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200301
302static void *
303__dma_alloc_remap(struct page *page, size_t size, gfp_t gfp, pgprot_t prot,
304 const void *caller)
305{
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200306 /*
307 * DMA allocation can be mapped to user space, so lets
308 * set VM_USERMAP flags too.
309 */
Laura Abbott513510d2014-10-09 15:26:40 -0700310 return dma_common_contiguous_remap(page, size,
311 VM_ARM_DMA_CONSISTENT | VM_USERMAP,
312 prot, caller);
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200313}
314
315static void __dma_free_remap(void *cpu_addr, size_t size)
316{
Laura Abbott513510d2014-10-09 15:26:40 -0700317 dma_common_free_remap(cpu_addr, size,
318 VM_ARM_DMA_CONSISTENT | VM_USERMAP);
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200319}
320
Marek Szyprowski6e5267a2012-08-20 11:19:25 +0200321#define DEFAULT_DMA_COHERENT_POOL_SIZE SZ_256K
Laura Abbott36d0fd22014-10-09 15:26:42 -0700322static struct gen_pool *atomic_pool;
Marek Szyprowski6e5267a2012-08-20 11:19:25 +0200323
Laura Abbott36d0fd22014-10-09 15:26:42 -0700324static size_t atomic_pool_size = DEFAULT_DMA_COHERENT_POOL_SIZE;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100325
326static int __init early_coherent_pool(char *p)
327{
Laura Abbott36d0fd22014-10-09 15:26:42 -0700328 atomic_pool_size = memparse(p, &p);
Marek Szyprowskic7909502011-12-29 13:09:51 +0100329 return 0;
330}
331early_param("coherent_pool", early_coherent_pool);
332
Marek Szyprowski6e5267a2012-08-20 11:19:25 +0200333void __init init_dma_coherent_pool_size(unsigned long size)
334{
335 /*
336 * Catch any attempt to set the pool size too late.
337 */
Laura Abbott36d0fd22014-10-09 15:26:42 -0700338 BUG_ON(atomic_pool);
Marek Szyprowski6e5267a2012-08-20 11:19:25 +0200339
340 /*
341 * Set architecture specific coherent pool size only if
342 * it has not been changed by kernel command line parameter.
343 */
Laura Abbott36d0fd22014-10-09 15:26:42 -0700344 if (atomic_pool_size == DEFAULT_DMA_COHERENT_POOL_SIZE)
345 atomic_pool_size = size;
Marek Szyprowski6e5267a2012-08-20 11:19:25 +0200346}
347
Marek Szyprowskic7909502011-12-29 13:09:51 +0100348/*
349 * Initialise the coherent pool for atomic allocations.
350 */
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200351static int __init atomic_pool_init(void)
Marek Szyprowskic7909502011-12-29 13:09:51 +0100352{
Russell King71b55662013-11-25 12:01:03 +0000353 pgprot_t prot = pgprot_dmacoherent(PAGE_KERNEL);
Marek Szyprowski9d1400c2013-02-26 07:46:24 +0100354 gfp_t gfp = GFP_KERNEL | GFP_DMA;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100355 struct page *page;
356 void *ptr;
357
Laura Abbott36d0fd22014-10-09 15:26:42 -0700358 atomic_pool = gen_pool_create(PAGE_SHIFT, -1);
359 if (!atomic_pool)
360 goto out;
Hiroshi Doyu6b3fe472012-08-28 08:13:01 +0300361
Gioh Kime464ef12014-05-22 13:38:23 +0900362 if (dev_get_cma_area(NULL))
Laura Abbott36d0fd22014-10-09 15:26:42 -0700363 ptr = __alloc_from_contiguous(NULL, atomic_pool_size, prot,
Carlo Caione6e8266e2015-02-09 10:38:35 +0100364 &page, atomic_pool_init, true);
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200365 else
Laura Abbott36d0fd22014-10-09 15:26:42 -0700366 ptr = __alloc_remap_buffer(NULL, atomic_pool_size, gfp, prot,
Carlo Caione6e8266e2015-02-09 10:38:35 +0100367 &page, atomic_pool_init, true);
Marek Szyprowskic7909502011-12-29 13:09:51 +0100368 if (ptr) {
Laura Abbott36d0fd22014-10-09 15:26:42 -0700369 int ret;
Hiroshi Doyu6b3fe472012-08-28 08:13:01 +0300370
Laura Abbott36d0fd22014-10-09 15:26:42 -0700371 ret = gen_pool_add_virt(atomic_pool, (unsigned long)ptr,
372 page_to_phys(page),
373 atomic_pool_size, -1);
374 if (ret)
375 goto destroy_genpool;
Hiroshi Doyu6b3fe472012-08-28 08:13:01 +0300376
Laura Abbott36d0fd22014-10-09 15:26:42 -0700377 gen_pool_set_algo(atomic_pool,
378 gen_pool_first_fit_order_align,
379 (void *)PAGE_SHIFT);
380 pr_info("DMA: preallocated %zd KiB pool for atomic coherent allocations\n",
381 atomic_pool_size / 1024);
Marek Szyprowskic7909502011-12-29 13:09:51 +0100382 return 0;
383 }
Sachin Kamatec106652012-09-24 08:35:03 +0200384
Laura Abbott36d0fd22014-10-09 15:26:42 -0700385destroy_genpool:
386 gen_pool_destroy(atomic_pool);
387 atomic_pool = NULL;
388out:
389 pr_err("DMA: failed to allocate %zx KiB pool for atomic coherent allocation\n",
390 atomic_pool_size / 1024);
Marek Szyprowskic7909502011-12-29 13:09:51 +0100391 return -ENOMEM;
392}
393/*
394 * CMA is activated by core_initcall, so we must be called after it.
395 */
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200396postcore_initcall(atomic_pool_init);
Marek Szyprowskic7909502011-12-29 13:09:51 +0100397
398struct dma_contig_early_reserve {
399 phys_addr_t base;
400 unsigned long size;
401};
402
403static struct dma_contig_early_reserve dma_mmu_remap[MAX_CMA_AREAS] __initdata;
404
405static int dma_mmu_remap_num __initdata;
406
407void __init dma_contiguous_early_fixup(phys_addr_t base, unsigned long size)
408{
409 dma_mmu_remap[dma_mmu_remap_num].base = base;
410 dma_mmu_remap[dma_mmu_remap_num].size = size;
411 dma_mmu_remap_num++;
412}
413
414void __init dma_contiguous_remap(void)
415{
416 int i;
417 for (i = 0; i < dma_mmu_remap_num; i++) {
418 phys_addr_t start = dma_mmu_remap[i].base;
419 phys_addr_t end = start + dma_mmu_remap[i].size;
420 struct map_desc map;
421 unsigned long addr;
422
423 if (end > arm_lowmem_limit)
424 end = arm_lowmem_limit;
425 if (start >= end)
Chris Brand39f78e72012-08-07 14:01:14 +0200426 continue;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100427
428 map.pfn = __phys_to_pfn(start);
429 map.virtual = __phys_to_virt(start);
430 map.length = end - start;
431 map.type = MT_MEMORY_DMA_READY;
432
433 /*
Russell King6b076992014-07-17 12:17:45 +0100434 * Clear previous low-memory mapping to ensure that the
435 * TLB does not see any conflicting entries, then flush
436 * the TLB of the old entries before creating new mappings.
437 *
438 * This ensures that any speculatively loaded TLB entries
439 * (even though they may be rare) can not cause any problems,
440 * and ensures that this code is architecturally compliant.
Marek Szyprowskic7909502011-12-29 13:09:51 +0100441 */
442 for (addr = __phys_to_virt(start); addr < __phys_to_virt(end);
Vitaly Andrianov61f6c7a2012-05-14 13:49:56 -0400443 addr += PMD_SIZE)
Marek Szyprowskic7909502011-12-29 13:09:51 +0100444 pmd_clear(pmd_off_k(addr));
445
Russell King6b076992014-07-17 12:17:45 +0100446 flush_tlb_kernel_range(__phys_to_virt(start),
447 __phys_to_virt(end));
448
Marek Szyprowskic7909502011-12-29 13:09:51 +0100449 iotable_init(&map, 1);
450 }
451}
452
Marek Szyprowskic7909502011-12-29 13:09:51 +0100453static int __dma_update_pte(pte_t *pte, pgtable_t token, unsigned long addr,
454 void *data)
455{
456 struct page *page = virt_to_page(addr);
457 pgprot_t prot = *(pgprot_t *)data;
458
459 set_pte_ext(pte, mk_pte(page, prot), 0);
460 return 0;
461}
462
463static void __dma_remap(struct page *page, size_t size, pgprot_t prot)
464{
465 unsigned long start = (unsigned long) page_address(page);
466 unsigned end = start + size;
467
468 apply_to_page_range(&init_mm, start, size, __dma_update_pte, &prot);
Marek Szyprowskic7909502011-12-29 13:09:51 +0100469 flush_tlb_kernel_range(start, end);
470}
471
472static void *__alloc_remap_buffer(struct device *dev, size_t size, gfp_t gfp,
473 pgprot_t prot, struct page **ret_page,
Carlo Caione6e8266e2015-02-09 10:38:35 +0100474 const void *caller, bool want_vaddr)
Marek Szyprowskic7909502011-12-29 13:09:51 +0100475{
476 struct page *page;
Carlo Caione6e8266e2015-02-09 10:38:35 +0100477 void *ptr = NULL;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100478 page = __dma_alloc_buffer(dev, size, gfp);
479 if (!page)
480 return NULL;
Carlo Caione6e8266e2015-02-09 10:38:35 +0100481 if (!want_vaddr)
482 goto out;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100483
484 ptr = __dma_alloc_remap(page, size, gfp, prot, caller);
485 if (!ptr) {
486 __dma_free_buffer(page, size);
487 return NULL;
488 }
489
Carlo Caione6e8266e2015-02-09 10:38:35 +0100490 out:
Marek Szyprowskic7909502011-12-29 13:09:51 +0100491 *ret_page = page;
492 return ptr;
493}
494
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200495static void *__alloc_from_pool(size_t size, struct page **ret_page)
Marek Szyprowskic7909502011-12-29 13:09:51 +0100496{
Laura Abbott36d0fd22014-10-09 15:26:42 -0700497 unsigned long val;
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200498 void *ptr = NULL;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100499
Laura Abbott36d0fd22014-10-09 15:26:42 -0700500 if (!atomic_pool) {
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200501 WARN(1, "coherent pool not initialised!\n");
Marek Szyprowskic7909502011-12-29 13:09:51 +0100502 return NULL;
503 }
504
Laura Abbott36d0fd22014-10-09 15:26:42 -0700505 val = gen_pool_alloc(atomic_pool, size);
506 if (val) {
507 phys_addr_t phys = gen_pool_virt_to_phys(atomic_pool, val);
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200508
Laura Abbott36d0fd22014-10-09 15:26:42 -0700509 *ret_page = phys_to_page(phys);
510 ptr = (void *)val;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100511 }
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200512
513 return ptr;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100514}
515
Hiroshi Doyu21d0a752012-08-28 08:13:02 +0300516static bool __in_atomic_pool(void *start, size_t size)
517{
Laura Abbott36d0fd22014-10-09 15:26:42 -0700518 return addr_in_gen_pool(atomic_pool, (unsigned long)start, size);
Hiroshi Doyu21d0a752012-08-28 08:13:02 +0300519}
520
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200521static int __free_from_pool(void *start, size_t size)
Marek Szyprowskic7909502011-12-29 13:09:51 +0100522{
Hiroshi Doyu21d0a752012-08-28 08:13:02 +0300523 if (!__in_atomic_pool(start, size))
Marek Szyprowskic7909502011-12-29 13:09:51 +0100524 return 0;
525
Laura Abbott36d0fd22014-10-09 15:26:42 -0700526 gen_pool_free(atomic_pool, (unsigned long)start, size);
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200527
Marek Szyprowskic7909502011-12-29 13:09:51 +0100528 return 1;
529}
530
531static void *__alloc_from_contiguous(struct device *dev, size_t size,
Marek Szyprowski9848e482013-01-16 15:38:44 +0100532 pgprot_t prot, struct page **ret_page,
Carlo Caione6e8266e2015-02-09 10:38:35 +0100533 const void *caller, bool want_vaddr)
Marek Szyprowskic7909502011-12-29 13:09:51 +0100534{
535 unsigned long order = get_order(size);
536 size_t count = size >> PAGE_SHIFT;
537 struct page *page;
Carlo Caione6e8266e2015-02-09 10:38:35 +0100538 void *ptr = NULL;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100539
540 page = dma_alloc_from_contiguous(dev, count, order);
541 if (!page)
542 return NULL;
543
544 __dma_clear_buffer(page, size);
Marek Szyprowskic7909502011-12-29 13:09:51 +0100545
Carlo Caione6e8266e2015-02-09 10:38:35 +0100546 if (!want_vaddr)
547 goto out;
548
Marek Szyprowski9848e482013-01-16 15:38:44 +0100549 if (PageHighMem(page)) {
550 ptr = __dma_alloc_remap(page, size, GFP_KERNEL, prot, caller);
551 if (!ptr) {
552 dma_release_from_contiguous(dev, page, count);
553 return NULL;
554 }
555 } else {
556 __dma_remap(page, size, prot);
557 ptr = page_address(page);
558 }
Carlo Caione6e8266e2015-02-09 10:38:35 +0100559
560 out:
Marek Szyprowskic7909502011-12-29 13:09:51 +0100561 *ret_page = page;
Marek Szyprowski9848e482013-01-16 15:38:44 +0100562 return ptr;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100563}
564
565static void __free_from_contiguous(struct device *dev, struct page *page,
Carlo Caione6e8266e2015-02-09 10:38:35 +0100566 void *cpu_addr, size_t size, bool want_vaddr)
Marek Szyprowskic7909502011-12-29 13:09:51 +0100567{
Carlo Caione6e8266e2015-02-09 10:38:35 +0100568 if (want_vaddr) {
569 if (PageHighMem(page))
570 __dma_free_remap(cpu_addr, size);
571 else
572 __dma_remap(page, size, PAGE_KERNEL);
573 }
Marek Szyprowskic7909502011-12-29 13:09:51 +0100574 dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT);
575}
576
Marek Szyprowskif99d6032012-05-16 18:31:23 +0200577static inline pgprot_t __get_dma_pgprot(struct dma_attrs *attrs, pgprot_t prot)
578{
579 prot = dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs) ?
580 pgprot_writecombine(prot) :
581 pgprot_dmacoherent(prot);
582 return prot;
583}
584
Marek Szyprowskic7909502011-12-29 13:09:51 +0100585#define nommu() 0
586
Catalin Marinasab6494f2009-07-24 12:35:02 +0100587#else /* !CONFIG_MMU */
Russell King695ae0a2009-11-19 16:31:39 +0000588
Marek Szyprowskic7909502011-12-29 13:09:51 +0100589#define nommu() 1
590
Carlo Caione6e8266e2015-02-09 10:38:35 +0100591#define __get_dma_pgprot(attrs, prot) __pgprot(0)
592#define __alloc_remap_buffer(dev, size, gfp, prot, ret, c, wv) NULL
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200593#define __alloc_from_pool(size, ret_page) NULL
Carlo Caione6e8266e2015-02-09 10:38:35 +0100594#define __alloc_from_contiguous(dev, size, prot, ret, c, wv) NULL
Marek Szyprowskic7909502011-12-29 13:09:51 +0100595#define __free_from_pool(cpu_addr, size) 0
Carlo Caione6e8266e2015-02-09 10:38:35 +0100596#define __free_from_contiguous(dev, page, cpu_addr, size, wv) do { } while (0)
Marek Szyprowskic7909502011-12-29 13:09:51 +0100597#define __dma_free_remap(cpu_addr, size) do { } while (0)
Russell King31ebf942009-11-19 21:12:17 +0000598
599#endif /* CONFIG_MMU */
600
Marek Szyprowskic7909502011-12-29 13:09:51 +0100601static void *__alloc_simple_buffer(struct device *dev, size_t size, gfp_t gfp,
602 struct page **ret_page)
Catalin Marinasab6494f2009-07-24 12:35:02 +0100603{
Russell King04da5692009-11-19 15:54:45 +0000604 struct page *page;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100605 page = __dma_alloc_buffer(dev, size, gfp);
606 if (!page)
607 return NULL;
608
609 *ret_page = page;
610 return page_address(page);
611}
612
613
614
615static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
Carlo Caione6e8266e2015-02-09 10:38:35 +0100616 gfp_t gfp, pgprot_t prot, bool is_coherent,
617 struct dma_attrs *attrs, const void *caller)
Marek Szyprowskic7909502011-12-29 13:09:51 +0100618{
619 u64 mask = get_coherent_dma_mask(dev);
Jingoo Han3dd7ea92012-10-24 14:09:14 +0900620 struct page *page = NULL;
Russell King31ebf942009-11-19 21:12:17 +0000621 void *addr;
Carlo Caione6e8266e2015-02-09 10:38:35 +0100622 bool want_vaddr;
Catalin Marinasab6494f2009-07-24 12:35:02 +0100623
Marek Szyprowskic7909502011-12-29 13:09:51 +0100624#ifdef CONFIG_DMA_API_DEBUG
625 u64 limit = (mask + 1) & ~mask;
626 if (limit && size >= limit) {
627 dev_warn(dev, "coherent allocation too big (requested %#x mask %#llx)\n",
628 size, mask);
629 return NULL;
630 }
631#endif
632
633 if (!mask)
634 return NULL;
635
636 if (mask < 0xffffffffULL)
637 gfp |= GFP_DMA;
638
Sumit Bhattacharyaea2e7052011-11-24 00:47:12 +0100639 /*
640 * Following is a work-around (a.k.a. hack) to prevent pages
641 * with __GFP_COMP being passed to split_page() which cannot
642 * handle them. The real problem is that this flag probably
643 * should be 0 on ARM as it is not supported on this
644 * platform; see CONFIG_HUGETLBFS.
645 */
646 gfp &= ~(__GFP_COMP);
647
Marek Szyprowski553ac782012-02-29 14:45:28 +0100648 *handle = DMA_ERROR_CODE;
Russell King04da5692009-11-19 15:54:45 +0000649 size = PAGE_ALIGN(size);
Carlo Caione6e8266e2015-02-09 10:38:35 +0100650 want_vaddr = !dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs);
Russell King04da5692009-11-19 15:54:45 +0000651
Lorenzo Nava21caf3a2015-07-02 17:28:03 +0100652 if (nommu())
653 addr = __alloc_simple_buffer(dev, size, gfp, &page);
654 else if (dev_get_cma_area(dev) && (gfp & __GFP_WAIT))
655 addr = __alloc_from_contiguous(dev, size, prot, &page,
656 caller, want_vaddr);
657 else if (is_coherent)
Marek Szyprowskic7909502011-12-29 13:09:51 +0100658 addr = __alloc_simple_buffer(dev, size, gfp, &page);
Russell King633dc922013-01-30 23:55:35 +0000659 else if (!(gfp & __GFP_WAIT))
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200660 addr = __alloc_from_pool(size, &page);
Russell King31ebf942009-11-19 21:12:17 +0000661 else
Lorenzo Nava21caf3a2015-07-02 17:28:03 +0100662 addr = __alloc_remap_buffer(dev, size, gfp, prot, &page,
663 caller, want_vaddr);
Russell King31ebf942009-11-19 21:12:17 +0000664
Carlo Caione6e8266e2015-02-09 10:38:35 +0100665 if (page)
Russell King9eedd962011-01-03 00:00:17 +0000666 *handle = pfn_to_dma(dev, page_to_pfn(page));
Russell King31ebf942009-11-19 21:12:17 +0000667
Carlo Caione6e8266e2015-02-09 10:38:35 +0100668 return want_vaddr ? addr : page;
Catalin Marinasab6494f2009-07-24 12:35:02 +0100669}
Russell King695ae0a2009-11-19 16:31:39 +0000670
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671/*
672 * Allocate DMA-coherent memory space and return both the kernel remapped
673 * virtual and bus address for that space.
674 */
Marek Szyprowskif99d6032012-05-16 18:31:23 +0200675void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
676 gfp_t gfp, struct dma_attrs *attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677{
Russell King0ea1ec72013-10-23 16:14:59 +0100678 pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL);
Dmitry Baryshkov1fe53262008-07-18 13:30:14 +0400679 void *memory;
680
681 if (dma_alloc_from_coherent(dev, size, handle, &memory))
682 return memory;
683
Rob Herringdd37e942012-08-21 12:20:17 +0200684 return __dma_alloc(dev, size, handle, gfp, prot, false,
Carlo Caione6e8266e2015-02-09 10:38:35 +0100685 attrs, __builtin_return_address(0));
Rob Herringdd37e942012-08-21 12:20:17 +0200686}
687
688static void *arm_coherent_dma_alloc(struct device *dev, size_t size,
689 dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs)
690{
Rob Herringdd37e942012-08-21 12:20:17 +0200691 void *memory;
692
693 if (dma_alloc_from_coherent(dev, size, handle, &memory))
694 return memory;
695
Lorenzo Nava21caf3a2015-07-02 17:28:03 +0100696 return __dma_alloc(dev, size, handle, gfp, PAGE_KERNEL, true,
Carlo Caione6e8266e2015-02-09 10:38:35 +0100697 attrs, __builtin_return_address(0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
Mike Looijmans55af8a92015-06-03 11:25:31 +0100700static int __arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
Marek Szyprowskif99d6032012-05-16 18:31:23 +0200701 void *cpu_addr, dma_addr_t dma_addr, size_t size,
702 struct dma_attrs *attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703{
Catalin Marinasab6494f2009-07-24 12:35:02 +0100704 int ret = -ENXIO;
705#ifdef CONFIG_MMU
Marek Szyprowski50262a42012-07-30 09:35:26 +0200706 unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
707 unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100708 unsigned long pfn = dma_to_pfn(dev, dma_addr);
Marek Szyprowski50262a42012-07-30 09:35:26 +0200709 unsigned long off = vma->vm_pgoff;
710
Marek Szyprowski47142f02012-05-15 19:04:13 +0200711 if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
712 return ret;
713
Marek Szyprowski50262a42012-07-30 09:35:26 +0200714 if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
715 ret = remap_pfn_range(vma, vma->vm_start,
716 pfn + off,
717 vma->vm_end - vma->vm_start,
718 vma->vm_page_prot);
719 }
Catalin Marinasab6494f2009-07-24 12:35:02 +0100720#endif /* CONFIG_MMU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
722 return ret;
723}
724
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725/*
Mike Looijmans55af8a92015-06-03 11:25:31 +0100726 * Create userspace mapping for the DMA-coherent memory.
727 */
728static int arm_coherent_dma_mmap(struct device *dev, struct vm_area_struct *vma,
729 void *cpu_addr, dma_addr_t dma_addr, size_t size,
730 struct dma_attrs *attrs)
731{
732 return __arm_dma_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
733}
734
735int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
736 void *cpu_addr, dma_addr_t dma_addr, size_t size,
737 struct dma_attrs *attrs)
738{
739#ifdef CONFIG_MMU
740 vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot);
741#endif /* CONFIG_MMU */
742 return __arm_dma_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
743}
744
745/*
Marek Szyprowskic7909502011-12-29 13:09:51 +0100746 * Free a buffer as defined by the above mapping.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 */
Rob Herringdd37e942012-08-21 12:20:17 +0200748static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
749 dma_addr_t handle, struct dma_attrs *attrs,
750 bool is_coherent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751{
Marek Szyprowskic7909502011-12-29 13:09:51 +0100752 struct page *page = pfn_to_page(dma_to_pfn(dev, handle));
Carlo Caione6e8266e2015-02-09 10:38:35 +0100753 bool want_vaddr = !dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs);
Russell King5edf71a2005-11-25 15:52:51 +0000754
Dmitry Baryshkov1fe53262008-07-18 13:30:14 +0400755 if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
756 return;
757
Russell King3e82d012009-11-19 15:38:12 +0000758 size = PAGE_ALIGN(size);
759
Lorenzo Nava21caf3a2015-07-02 17:28:03 +0100760 if (nommu()) {
Marek Szyprowskic7909502011-12-29 13:09:51 +0100761 __dma_free_buffer(page, size);
Lorenzo Nava21caf3a2015-07-02 17:28:03 +0100762 } else if (!is_coherent && __free_from_pool(cpu_addr, size)) {
Aaro Koskinend9e0d142012-08-07 14:44:05 +0200763 return;
Gioh Kime464ef12014-05-22 13:38:23 +0900764 } else if (!dev_get_cma_area(dev)) {
Lorenzo Nava21caf3a2015-07-02 17:28:03 +0100765 if (want_vaddr && !is_coherent)
Carlo Caione6e8266e2015-02-09 10:38:35 +0100766 __dma_free_remap(cpu_addr, size);
Marek Szyprowskic7909502011-12-29 13:09:51 +0100767 __dma_free_buffer(page, size);
768 } else {
Marek Szyprowskic7909502011-12-29 13:09:51 +0100769 /*
770 * Non-atomic allocations cannot be freed with IRQs disabled
771 */
772 WARN_ON(irqs_disabled());
Carlo Caione6e8266e2015-02-09 10:38:35 +0100773 __free_from_contiguous(dev, page, cpu_addr, size, want_vaddr);
Marek Szyprowskic7909502011-12-29 13:09:51 +0100774 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775}
Russell Kingafd1a322008-09-25 16:30:57 +0100776
Rob Herringdd37e942012-08-21 12:20:17 +0200777void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
778 dma_addr_t handle, struct dma_attrs *attrs)
779{
780 __arm_dma_free(dev, size, cpu_addr, handle, attrs, false);
781}
782
783static void arm_coherent_dma_free(struct device *dev, size_t size, void *cpu_addr,
784 dma_addr_t handle, struct dma_attrs *attrs)
785{
786 __arm_dma_free(dev, size, cpu_addr, handle, attrs, true);
787}
788
Marek Szyprowskidc2832e2012-06-13 10:01:15 +0200789int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
790 void *cpu_addr, dma_addr_t handle, size_t size,
791 struct dma_attrs *attrs)
792{
793 struct page *page = pfn_to_page(dma_to_pfn(dev, handle));
794 int ret;
795
796 ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
797 if (unlikely(ret))
798 return ret;
799
800 sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
801 return 0;
802}
803
Russell King65af1912009-11-24 17:53:33 +0000804static void dma_cache_maint_page(struct page *page, unsigned long offset,
Russell Kinga9c91472009-11-26 16:19:58 +0000805 size_t size, enum dma_data_direction dir,
806 void (*op)(const void *, size_t, int))
Russell King65af1912009-11-24 17:53:33 +0000807{
Russell King15653372013-01-19 11:05:57 +0000808 unsigned long pfn;
809 size_t left = size;
810
811 pfn = page_to_pfn(page) + offset / PAGE_SIZE;
812 offset %= PAGE_SIZE;
813
Russell King65af1912009-11-24 17:53:33 +0000814 /*
815 * A single sg entry may refer to multiple physically contiguous
816 * pages. But we still need to process highmem pages individually.
817 * If highmem is not configured then the bulk of this loop gets
818 * optimized out.
819 */
Russell King65af1912009-11-24 17:53:33 +0000820 do {
821 size_t len = left;
Russell King93f1d622009-11-24 14:41:01 +0000822 void *vaddr;
823
Russell King15653372013-01-19 11:05:57 +0000824 page = pfn_to_page(pfn);
825
Russell King93f1d622009-11-24 14:41:01 +0000826 if (PageHighMem(page)) {
Russell King15653372013-01-19 11:05:57 +0000827 if (len + offset > PAGE_SIZE)
Russell King93f1d622009-11-24 14:41:01 +0000828 len = PAGE_SIZE - offset;
Joonsoo Kimdd0f67f2013-04-05 03:16:14 +0100829
830 if (cache_is_vipt_nonaliasing()) {
Nicolas Pitre39af22a2010-12-15 15:14:45 -0500831 vaddr = kmap_atomic(page);
Nicolas Pitre7e5a69e2010-03-29 21:46:02 +0100832 op(vaddr + offset, len, dir);
Nicolas Pitre39af22a2010-12-15 15:14:45 -0500833 kunmap_atomic(vaddr);
Joonsoo Kimdd0f67f2013-04-05 03:16:14 +0100834 } else {
835 vaddr = kmap_high_get(page);
836 if (vaddr) {
837 op(vaddr + offset, len, dir);
838 kunmap_high(page);
839 }
Russell King93f1d622009-11-24 14:41:01 +0000840 }
841 } else {
842 vaddr = page_address(page) + offset;
Russell Kinga9c91472009-11-26 16:19:58 +0000843 op(vaddr, len, dir);
Russell King65af1912009-11-24 17:53:33 +0000844 }
Russell King65af1912009-11-24 17:53:33 +0000845 offset = 0;
Russell King15653372013-01-19 11:05:57 +0000846 pfn++;
Russell King65af1912009-11-24 17:53:33 +0000847 left -= len;
848 } while (left);
849}
850
Marek Szyprowski51fde3492012-02-10 19:55:20 +0100851/*
852 * Make an area consistent for devices.
853 * Note: Drivers should NOT use this function directly, as it will break
854 * platforms with CONFIG_DMABOUNCE.
855 * Use the driver DMA support - see dma-mapping.h (dma_sync_*)
856 */
857static void __dma_page_cpu_to_dev(struct page *page, unsigned long off,
Russell King65af1912009-11-24 17:53:33 +0000858 size_t size, enum dma_data_direction dir)
859{
Santosh Shilimkar2161c242014-04-24 11:30:07 -0400860 phys_addr_t paddr;
Nicolas Pitre43377452009-03-12 22:52:09 -0400861
Russell Kinga9c91472009-11-26 16:19:58 +0000862 dma_cache_maint_page(page, off, size, dir, dmac_map_area);
Nicolas Pitre43377452009-03-12 22:52:09 -0400863
Russell King65af1912009-11-24 17:53:33 +0000864 paddr = page_to_phys(page) + off;
Russell King2ffe2da2009-10-31 16:52:16 +0000865 if (dir == DMA_FROM_DEVICE) {
866 outer_inv_range(paddr, paddr + size);
867 } else {
868 outer_clean_range(paddr, paddr + size);
869 }
870 /* FIXME: non-speculating: flush on bidirectional mappings? */
Nicolas Pitre43377452009-03-12 22:52:09 -0400871}
Russell King4ea0d732009-11-24 16:27:17 +0000872
Marek Szyprowski51fde3492012-02-10 19:55:20 +0100873static void __dma_page_dev_to_cpu(struct page *page, unsigned long off,
Russell King4ea0d732009-11-24 16:27:17 +0000874 size_t size, enum dma_data_direction dir)
875{
Santosh Shilimkar2161c242014-04-24 11:30:07 -0400876 phys_addr_t paddr = page_to_phys(page) + off;
Russell King2ffe2da2009-10-31 16:52:16 +0000877
878 /* FIXME: non-speculating: not required */
Russell Kingdeace4a2014-05-03 11:06:55 +0100879 /* in any case, don't bother invalidating if DMA to device */
880 if (dir != DMA_TO_DEVICE) {
Russell King2ffe2da2009-10-31 16:52:16 +0000881 outer_inv_range(paddr, paddr + size);
882
Russell Kingdeace4a2014-05-03 11:06:55 +0100883 dma_cache_maint_page(page, off, size, dir, dmac_unmap_area);
884 }
Catalin Marinasc0177802010-09-13 15:57:36 +0100885
886 /*
Ming Leib2a234e2013-05-18 11:21:36 +0100887 * Mark the D-cache clean for these pages to avoid extra flushing.
Catalin Marinasc0177802010-09-13 15:57:36 +0100888 */
Ming Leib2a234e2013-05-18 11:21:36 +0100889 if (dir != DMA_TO_DEVICE && size >= PAGE_SIZE) {
890 unsigned long pfn;
891 size_t left = size;
892
893 pfn = page_to_pfn(page) + off / PAGE_SIZE;
894 off %= PAGE_SIZE;
895 if (off) {
896 pfn++;
897 left -= PAGE_SIZE - off;
898 }
899 while (left >= PAGE_SIZE) {
900 page = pfn_to_page(pfn++);
901 set_bit(PG_dcache_clean, &page->flags);
902 left -= PAGE_SIZE;
903 }
904 }
Russell King4ea0d732009-11-24 16:27:17 +0000905}
Nicolas Pitre43377452009-03-12 22:52:09 -0400906
Russell Kingafd1a322008-09-25 16:30:57 +0100907/**
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100908 * arm_dma_map_sg - map a set of SG buffers for streaming mode DMA
Russell Kingafd1a322008-09-25 16:30:57 +0100909 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
910 * @sg: list of buffers
911 * @nents: number of buffers to map
912 * @dir: DMA transfer direction
913 *
914 * Map a set of buffers described by scatterlist in streaming mode for DMA.
915 * This is the scatter-gather version of the dma_map_single interface.
916 * Here the scatter gather list elements are each tagged with the
917 * appropriate dma address and length. They are obtained via
918 * sg_dma_{address,length}.
919 *
920 * Device ownership issues as mentioned for dma_map_single are the same
921 * here.
922 */
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100923int arm_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
924 enum dma_data_direction dir, struct dma_attrs *attrs)
Russell Kingafd1a322008-09-25 16:30:57 +0100925{
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100926 struct dma_map_ops *ops = get_dma_ops(dev);
Russell Kingafd1a322008-09-25 16:30:57 +0100927 struct scatterlist *s;
Russell King01135d922008-09-25 21:05:02 +0100928 int i, j;
Russell Kingafd1a322008-09-25 16:30:57 +0100929
930 for_each_sg(sg, s, nents, i) {
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +0200931#ifdef CONFIG_NEED_SG_DMA_LENGTH
932 s->dma_length = s->length;
933#endif
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100934 s->dma_address = ops->map_page(dev, sg_page(s), s->offset,
935 s->length, dir, attrs);
Russell King01135d922008-09-25 21:05:02 +0100936 if (dma_mapping_error(dev, s->dma_address))
937 goto bad_mapping;
Russell Kingafd1a322008-09-25 16:30:57 +0100938 }
Russell Kingafd1a322008-09-25 16:30:57 +0100939 return nents;
Russell King01135d922008-09-25 21:05:02 +0100940
941 bad_mapping:
942 for_each_sg(sg, s, i, j)
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100943 ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs);
Russell King01135d922008-09-25 21:05:02 +0100944 return 0;
Russell Kingafd1a322008-09-25 16:30:57 +0100945}
Russell Kingafd1a322008-09-25 16:30:57 +0100946
947/**
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100948 * arm_dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
Russell Kingafd1a322008-09-25 16:30:57 +0100949 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
950 * @sg: list of buffers
Linus Walleij0adfca62011-01-12 18:50:37 +0100951 * @nents: number of buffers to unmap (same as was passed to dma_map_sg)
Russell Kingafd1a322008-09-25 16:30:57 +0100952 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
953 *
954 * Unmap a set of streaming mode DMA translations. Again, CPU access
955 * rules concerning calls here are the same as for dma_unmap_single().
956 */
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100957void arm_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
958 enum dma_data_direction dir, struct dma_attrs *attrs)
Russell Kingafd1a322008-09-25 16:30:57 +0100959{
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100960 struct dma_map_ops *ops = get_dma_ops(dev);
Russell King01135d922008-09-25 21:05:02 +0100961 struct scatterlist *s;
Russell King01135d922008-09-25 21:05:02 +0100962
Russell King01135d922008-09-25 21:05:02 +0100963 int i;
Russell King24056f52011-01-03 11:29:28 +0000964
Russell King01135d922008-09-25 21:05:02 +0100965 for_each_sg(sg, s, nents, i)
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100966 ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs);
Russell Kingafd1a322008-09-25 16:30:57 +0100967}
Russell Kingafd1a322008-09-25 16:30:57 +0100968
969/**
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100970 * arm_dma_sync_sg_for_cpu
Russell Kingafd1a322008-09-25 16:30:57 +0100971 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
972 * @sg: list of buffers
973 * @nents: number of buffers to map (returned from dma_map_sg)
974 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
975 */
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100976void arm_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
Russell Kingafd1a322008-09-25 16:30:57 +0100977 int nents, enum dma_data_direction dir)
978{
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100979 struct dma_map_ops *ops = get_dma_ops(dev);
Russell Kingafd1a322008-09-25 16:30:57 +0100980 struct scatterlist *s;
981 int i;
982
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100983 for_each_sg(sg, s, nents, i)
984 ops->sync_single_for_cpu(dev, sg_dma_address(s), s->length,
985 dir);
Russell Kingafd1a322008-09-25 16:30:57 +0100986}
Russell Kingafd1a322008-09-25 16:30:57 +0100987
988/**
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100989 * arm_dma_sync_sg_for_device
Russell Kingafd1a322008-09-25 16:30:57 +0100990 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
991 * @sg: list of buffers
992 * @nents: number of buffers to map (returned from dma_map_sg)
993 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
994 */
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100995void arm_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
Russell Kingafd1a322008-09-25 16:30:57 +0100996 int nents, enum dma_data_direction dir)
997{
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100998 struct dma_map_ops *ops = get_dma_ops(dev);
Russell Kingafd1a322008-09-25 16:30:57 +0100999 struct scatterlist *s;
1000 int i;
1001
Marek Szyprowski2a550e72012-02-10 19:55:20 +01001002 for_each_sg(sg, s, nents, i)
1003 ops->sync_single_for_device(dev, sg_dma_address(s), s->length,
1004 dir);
Russell Kingafd1a322008-09-25 16:30:57 +01001005}
Russell King24056f52011-01-03 11:29:28 +00001006
Russell King022ae532011-07-08 21:26:59 +01001007/*
1008 * Return whether the given device DMA address mask can be supported
1009 * properly. For example, if your device can only drive the low 24-bits
1010 * during bus mastering, then you would pass 0x00ffffff as the mask
1011 * to this function.
1012 */
1013int dma_supported(struct device *dev, u64 mask)
1014{
Russell King9f28cde2013-12-06 12:30:42 +00001015 return __dma_supported(dev, mask, false);
Russell King022ae532011-07-08 21:26:59 +01001016}
1017EXPORT_SYMBOL(dma_supported);
1018
Gregory CLEMENT87b54e72012-11-21 09:39:19 +01001019int arm_dma_set_mask(struct device *dev, u64 dma_mask)
Russell King022ae532011-07-08 21:26:59 +01001020{
1021 if (!dev->dma_mask || !dma_supported(dev, dma_mask))
1022 return -EIO;
1023
Russell King022ae532011-07-08 21:26:59 +01001024 *dev->dma_mask = dma_mask;
Russell King022ae532011-07-08 21:26:59 +01001025
1026 return 0;
1027}
Russell King022ae532011-07-08 21:26:59 +01001028
Russell King24056f52011-01-03 11:29:28 +00001029#define PREALLOC_DMA_DEBUG_ENTRIES 4096
1030
1031static int __init dma_debug_do_init(void)
1032{
1033 dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
1034 return 0;
1035}
1036fs_initcall(dma_debug_do_init);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001037
1038#ifdef CONFIG_ARM_DMA_USE_IOMMU
1039
1040/* IOMMU */
1041
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001042static int extend_iommu_mapping(struct dma_iommu_mapping *mapping);
1043
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001044static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping,
1045 size_t size)
1046{
1047 unsigned int order = get_order(size);
1048 unsigned int align = 0;
1049 unsigned int count, start;
Ritesh Harjani006f8412014-05-20 10:02:59 +05301050 size_t mapping_size = mapping->bits << PAGE_SHIFT;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001051 unsigned long flags;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001052 dma_addr_t iova;
1053 int i;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001054
Seung-Woo Kim60460ab2013-02-06 13:21:14 +09001055 if (order > CONFIG_ARM_DMA_IOMMU_ALIGNMENT)
1056 order = CONFIG_ARM_DMA_IOMMU_ALIGNMENT;
1057
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001058 count = PAGE_ALIGN(size) >> PAGE_SHIFT;
1059 align = (1 << order) - 1;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001060
1061 spin_lock_irqsave(&mapping->lock, flags);
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001062 for (i = 0; i < mapping->nr_bitmaps; i++) {
1063 start = bitmap_find_next_zero_area(mapping->bitmaps[i],
1064 mapping->bits, 0, count, align);
1065
1066 if (start > mapping->bits)
1067 continue;
1068
1069 bitmap_set(mapping->bitmaps[i], start, count);
1070 break;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001071 }
1072
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001073 /*
1074 * No unused range found. Try to extend the existing mapping
1075 * and perform a second attempt to reserve an IO virtual
1076 * address range of size bytes.
1077 */
1078 if (i == mapping->nr_bitmaps) {
1079 if (extend_iommu_mapping(mapping)) {
1080 spin_unlock_irqrestore(&mapping->lock, flags);
1081 return DMA_ERROR_CODE;
1082 }
1083
1084 start = bitmap_find_next_zero_area(mapping->bitmaps[i],
1085 mapping->bits, 0, count, align);
1086
1087 if (start > mapping->bits) {
1088 spin_unlock_irqrestore(&mapping->lock, flags);
1089 return DMA_ERROR_CODE;
1090 }
1091
1092 bitmap_set(mapping->bitmaps[i], start, count);
1093 }
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001094 spin_unlock_irqrestore(&mapping->lock, flags);
1095
Ritesh Harjani006f8412014-05-20 10:02:59 +05301096 iova = mapping->base + (mapping_size * i);
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001097 iova += start << PAGE_SHIFT;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001098
1099 return iova;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001100}
1101
1102static inline void __free_iova(struct dma_iommu_mapping *mapping,
1103 dma_addr_t addr, size_t size)
1104{
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001105 unsigned int start, count;
Ritesh Harjani006f8412014-05-20 10:02:59 +05301106 size_t mapping_size = mapping->bits << PAGE_SHIFT;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001107 unsigned long flags;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001108 dma_addr_t bitmap_base;
1109 u32 bitmap_index;
1110
1111 if (!size)
1112 return;
1113
Ritesh Harjani006f8412014-05-20 10:02:59 +05301114 bitmap_index = (u32) (addr - mapping->base) / (u32) mapping_size;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001115 BUG_ON(addr < mapping->base || bitmap_index > mapping->extensions);
1116
Ritesh Harjani006f8412014-05-20 10:02:59 +05301117 bitmap_base = mapping->base + mapping_size * bitmap_index;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001118
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001119 start = (addr - bitmap_base) >> PAGE_SHIFT;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001120
Ritesh Harjani006f8412014-05-20 10:02:59 +05301121 if (addr + size > bitmap_base + mapping_size) {
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001122 /*
1123 * The address range to be freed reaches into the iova
1124 * range of the next bitmap. This should not happen as
1125 * we don't allow this in __alloc_iova (at the
1126 * moment).
1127 */
1128 BUG();
1129 } else
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001130 count = size >> PAGE_SHIFT;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001131
1132 spin_lock_irqsave(&mapping->lock, flags);
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001133 bitmap_clear(mapping->bitmaps[bitmap_index], start, count);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001134 spin_unlock_irqrestore(&mapping->lock, flags);
1135}
1136
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001137static struct page **__iommu_alloc_buffer(struct device *dev, size_t size,
1138 gfp_t gfp, struct dma_attrs *attrs)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001139{
1140 struct page **pages;
1141 int count = size >> PAGE_SHIFT;
1142 int array_size = count * sizeof(struct page *);
1143 int i = 0;
1144
1145 if (array_size <= PAGE_SIZE)
Alexandre Courbot23be7fd2015-02-19 07:29:58 +01001146 pages = kzalloc(array_size, GFP_KERNEL);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001147 else
1148 pages = vzalloc(array_size);
1149 if (!pages)
1150 return NULL;
1151
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001152 if (dma_get_attr(DMA_ATTR_FORCE_CONTIGUOUS, attrs))
1153 {
1154 unsigned long order = get_order(size);
1155 struct page *page;
1156
1157 page = dma_alloc_from_contiguous(dev, count, order);
1158 if (!page)
1159 goto error;
1160
1161 __dma_clear_buffer(page, size);
1162
1163 for (i = 0; i < count; i++)
1164 pages[i] = page + i;
1165
1166 return pages;
1167 }
1168
Marek Szyprowskif8669be2013-01-16 15:41:02 +01001169 /*
1170 * IOMMU can map any pages, so himem can also be used here
1171 */
1172 gfp |= __GFP_NOWARN | __GFP_HIGHMEM;
1173
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001174 while (count) {
Tomasz Figa49f28aa2015-04-01 07:26:33 +01001175 int j, order;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001176
Tomasz Figa49f28aa2015-04-01 07:26:33 +01001177 for (order = __fls(count); order > 0; --order) {
1178 /*
1179 * We do not want OOM killer to be invoked as long
1180 * as we can fall back to single pages, so we force
1181 * __GFP_NORETRY for orders higher than zero.
1182 */
1183 pages[i] = alloc_pages(gfp | __GFP_NORETRY, order);
1184 if (pages[i])
1185 break;
1186 }
1187
1188 if (!pages[i]) {
1189 /*
1190 * Fall back to single page allocation.
1191 * Might invoke OOM killer as last resort.
1192 */
1193 pages[i] = alloc_pages(gfp, 0);
1194 if (!pages[i])
1195 goto error;
1196 }
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001197
Hiroshi Doyu5a796ee2012-09-11 07:39:39 +02001198 if (order) {
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001199 split_page(pages[i], order);
Hiroshi Doyu5a796ee2012-09-11 07:39:39 +02001200 j = 1 << order;
1201 while (--j)
1202 pages[i + j] = pages[i] + j;
1203 }
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001204
1205 __dma_clear_buffer(pages[i], PAGE_SIZE << order);
1206 i += 1 << order;
1207 count -= 1 << order;
1208 }
1209
1210 return pages;
1211error:
Marek Szyprowski9fa8af92012-07-27 17:12:50 +02001212 while (i--)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001213 if (pages[i])
1214 __free_pages(pages[i], 0);
Prathyush K46c87852012-07-16 08:59:55 +02001215 if (array_size <= PAGE_SIZE)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001216 kfree(pages);
1217 else
1218 vfree(pages);
1219 return NULL;
1220}
1221
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001222static int __iommu_free_buffer(struct device *dev, struct page **pages,
1223 size_t size, struct dma_attrs *attrs)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001224{
1225 int count = size >> PAGE_SHIFT;
1226 int array_size = count * sizeof(struct page *);
1227 int i;
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001228
1229 if (dma_get_attr(DMA_ATTR_FORCE_CONTIGUOUS, attrs)) {
1230 dma_release_from_contiguous(dev, pages[0], count);
1231 } else {
1232 for (i = 0; i < count; i++)
1233 if (pages[i])
1234 __free_pages(pages[i], 0);
1235 }
1236
Prathyush K46c87852012-07-16 08:59:55 +02001237 if (array_size <= PAGE_SIZE)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001238 kfree(pages);
1239 else
1240 vfree(pages);
1241 return 0;
1242}
1243
1244/*
1245 * Create a CPU mapping for a specified pages
1246 */
1247static void *
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001248__iommu_alloc_remap(struct page **pages, size_t size, gfp_t gfp, pgprot_t prot,
1249 const void *caller)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001250{
Laura Abbott513510d2014-10-09 15:26:40 -07001251 return dma_common_pages_remap(pages, size,
1252 VM_ARM_DMA_CONSISTENT | VM_USERMAP, prot, caller);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001253}
1254
1255/*
1256 * Create a mapping in device IO address space for specified pages
1257 */
1258static dma_addr_t
1259__iommu_create_mapping(struct device *dev, struct page **pages, size_t size)
1260{
Will Deacon89cfdb12015-01-16 18:02:15 +01001261 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001262 unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
1263 dma_addr_t dma_addr, iova;
1264 int i, ret = DMA_ERROR_CODE;
1265
1266 dma_addr = __alloc_iova(mapping, size);
1267 if (dma_addr == DMA_ERROR_CODE)
1268 return dma_addr;
1269
1270 iova = dma_addr;
1271 for (i = 0; i < count; ) {
1272 unsigned int next_pfn = page_to_pfn(pages[i]) + 1;
1273 phys_addr_t phys = page_to_phys(pages[i]);
1274 unsigned int len, j;
1275
1276 for (j = i + 1; j < count; j++, next_pfn++)
1277 if (page_to_pfn(pages[j]) != next_pfn)
1278 break;
1279
1280 len = (j - i) << PAGE_SHIFT;
Andreas Herrmannc9b24992013-09-27 00:36:15 +02001281 ret = iommu_map(mapping->domain, iova, phys, len,
1282 IOMMU_READ|IOMMU_WRITE);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001283 if (ret < 0)
1284 goto fail;
1285 iova += len;
1286 i = j;
1287 }
1288 return dma_addr;
1289fail:
1290 iommu_unmap(mapping->domain, dma_addr, iova-dma_addr);
1291 __free_iova(mapping, dma_addr, size);
1292 return DMA_ERROR_CODE;
1293}
1294
1295static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t size)
1296{
Will Deacon89cfdb12015-01-16 18:02:15 +01001297 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001298
1299 /*
1300 * add optional in-page offset from iova to size and align
1301 * result to page size
1302 */
1303 size = PAGE_ALIGN((iova & ~PAGE_MASK) + size);
1304 iova &= PAGE_MASK;
1305
1306 iommu_unmap(mapping->domain, iova, size);
1307 __free_iova(mapping, iova, size);
1308 return 0;
1309}
1310
Hiroshi Doyu665bad72012-08-28 08:13:03 +03001311static struct page **__atomic_get_pages(void *addr)
1312{
Laura Abbott36d0fd22014-10-09 15:26:42 -07001313 struct page *page;
1314 phys_addr_t phys;
Hiroshi Doyu665bad72012-08-28 08:13:03 +03001315
Laura Abbott36d0fd22014-10-09 15:26:42 -07001316 phys = gen_pool_virt_to_phys(atomic_pool, (unsigned long)addr);
1317 page = phys_to_page(phys);
1318
1319 return (struct page **)page;
Hiroshi Doyu665bad72012-08-28 08:13:03 +03001320}
1321
Marek Szyprowski955c7572012-05-16 19:38:58 +01001322static struct page **__iommu_get_pages(void *cpu_addr, struct dma_attrs *attrs)
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001323{
1324 struct vm_struct *area;
1325
Hiroshi Doyu665bad72012-08-28 08:13:03 +03001326 if (__in_atomic_pool(cpu_addr, PAGE_SIZE))
1327 return __atomic_get_pages(cpu_addr);
1328
Marek Szyprowski955c7572012-05-16 19:38:58 +01001329 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs))
1330 return cpu_addr;
1331
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001332 area = find_vm_area(cpu_addr);
1333 if (area && (area->flags & VM_ARM_DMA_CONSISTENT))
1334 return area->pages;
1335 return NULL;
1336}
1337
Hiroshi Doyu479ed932012-08-28 08:13:04 +03001338static void *__iommu_alloc_atomic(struct device *dev, size_t size,
1339 dma_addr_t *handle)
1340{
1341 struct page *page;
1342 void *addr;
1343
1344 addr = __alloc_from_pool(size, &page);
1345 if (!addr)
1346 return NULL;
1347
1348 *handle = __iommu_create_mapping(dev, &page, size);
1349 if (*handle == DMA_ERROR_CODE)
1350 goto err_mapping;
1351
1352 return addr;
1353
1354err_mapping:
1355 __free_from_pool(addr, size);
1356 return NULL;
1357}
1358
Marek Szyprowskid5898292013-02-08 10:54:48 +01001359static void __iommu_free_atomic(struct device *dev, void *cpu_addr,
Hiroshi Doyu479ed932012-08-28 08:13:04 +03001360 dma_addr_t handle, size_t size)
1361{
1362 __iommu_remove_mapping(dev, handle, size);
Marek Szyprowskid5898292013-02-08 10:54:48 +01001363 __free_from_pool(cpu_addr, size);
Hiroshi Doyu479ed932012-08-28 08:13:04 +03001364}
1365
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001366static void *arm_iommu_alloc_attrs(struct device *dev, size_t size,
1367 dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs)
1368{
Russell King71b55662013-11-25 12:01:03 +00001369 pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001370 struct page **pages;
1371 void *addr = NULL;
1372
1373 *handle = DMA_ERROR_CODE;
1374 size = PAGE_ALIGN(size);
1375
Marek Szyprowski10c85622014-01-16 15:39:17 +01001376 if (!(gfp & __GFP_WAIT))
Hiroshi Doyu479ed932012-08-28 08:13:04 +03001377 return __iommu_alloc_atomic(dev, size, handle);
1378
Richard Zhao5b91a982013-06-20 20:31:00 +08001379 /*
1380 * Following is a work-around (a.k.a. hack) to prevent pages
1381 * with __GFP_COMP being passed to split_page() which cannot
1382 * handle them. The real problem is that this flag probably
1383 * should be 0 on ARM as it is not supported on this
1384 * platform; see CONFIG_HUGETLBFS.
1385 */
1386 gfp &= ~(__GFP_COMP);
1387
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001388 pages = __iommu_alloc_buffer(dev, size, gfp, attrs);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001389 if (!pages)
1390 return NULL;
1391
1392 *handle = __iommu_create_mapping(dev, pages, size);
1393 if (*handle == DMA_ERROR_CODE)
1394 goto err_buffer;
1395
Marek Szyprowski955c7572012-05-16 19:38:58 +01001396 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs))
1397 return pages;
1398
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001399 addr = __iommu_alloc_remap(pages, size, gfp, prot,
1400 __builtin_return_address(0));
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001401 if (!addr)
1402 goto err_mapping;
1403
1404 return addr;
1405
1406err_mapping:
1407 __iommu_remove_mapping(dev, *handle, size);
1408err_buffer:
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001409 __iommu_free_buffer(dev, pages, size, attrs);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001410 return NULL;
1411}
1412
1413static int arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
1414 void *cpu_addr, dma_addr_t dma_addr, size_t size,
1415 struct dma_attrs *attrs)
1416{
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001417 unsigned long uaddr = vma->vm_start;
1418 unsigned long usize = vma->vm_end - vma->vm_start;
Marek Szyprowski955c7572012-05-16 19:38:58 +01001419 struct page **pages = __iommu_get_pages(cpu_addr, attrs);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001420
1421 vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001422
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001423 if (!pages)
1424 return -ENXIO;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001425
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001426 do {
1427 int ret = vm_insert_page(vma, uaddr, *pages++);
1428 if (ret) {
1429 pr_err("Remapping memory failed: %d\n", ret);
1430 return ret;
1431 }
1432 uaddr += PAGE_SIZE;
1433 usize -= PAGE_SIZE;
1434 } while (usize > 0);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001435
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001436 return 0;
1437}
1438
1439/*
1440 * free a page as defined by the above mapping.
1441 * Must not be called with IRQs disabled.
1442 */
1443void arm_iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr,
1444 dma_addr_t handle, struct dma_attrs *attrs)
1445{
YoungJun Cho836bfa02013-06-17 13:18:52 +09001446 struct page **pages;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001447 size = PAGE_ALIGN(size);
1448
Hiroshi Doyu479ed932012-08-28 08:13:04 +03001449 if (__in_atomic_pool(cpu_addr, size)) {
Marek Szyprowskid5898292013-02-08 10:54:48 +01001450 __iommu_free_atomic(dev, cpu_addr, handle, size);
Hiroshi Doyu479ed932012-08-28 08:13:04 +03001451 return;
1452 }
1453
YoungJun Cho836bfa02013-06-17 13:18:52 +09001454 pages = __iommu_get_pages(cpu_addr, attrs);
1455 if (!pages) {
1456 WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr);
1457 return;
1458 }
1459
Marek Szyprowski955c7572012-05-16 19:38:58 +01001460 if (!dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) {
Laura Abbott513510d2014-10-09 15:26:40 -07001461 dma_common_free_remap(cpu_addr, size,
1462 VM_ARM_DMA_CONSISTENT | VM_USERMAP);
Marek Szyprowski955c7572012-05-16 19:38:58 +01001463 }
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001464
1465 __iommu_remove_mapping(dev, handle, size);
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001466 __iommu_free_buffer(dev, pages, size, attrs);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001467}
1468
Marek Szyprowskidc2832e2012-06-13 10:01:15 +02001469static int arm_iommu_get_sgtable(struct device *dev, struct sg_table *sgt,
1470 void *cpu_addr, dma_addr_t dma_addr,
1471 size_t size, struct dma_attrs *attrs)
1472{
1473 unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
1474 struct page **pages = __iommu_get_pages(cpu_addr, attrs);
1475
1476 if (!pages)
1477 return -ENXIO;
1478
1479 return sg_alloc_table_from_pages(sgt, pages, count, 0, size,
1480 GFP_KERNEL);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001481}
1482
Andreas Herrmannc9b24992013-09-27 00:36:15 +02001483static int __dma_direction_to_prot(enum dma_data_direction dir)
1484{
1485 int prot;
1486
1487 switch (dir) {
1488 case DMA_BIDIRECTIONAL:
1489 prot = IOMMU_READ | IOMMU_WRITE;
1490 break;
1491 case DMA_TO_DEVICE:
1492 prot = IOMMU_READ;
1493 break;
1494 case DMA_FROM_DEVICE:
1495 prot = IOMMU_WRITE;
1496 break;
1497 default:
1498 prot = 0;
1499 }
1500
1501 return prot;
1502}
1503
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001504/*
1505 * Map a part of the scatter-gather list into contiguous io address space
1506 */
1507static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
1508 size_t size, dma_addr_t *handle,
Rob Herring0fa478d2012-08-21 12:23:23 +02001509 enum dma_data_direction dir, struct dma_attrs *attrs,
1510 bool is_coherent)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001511{
Will Deacon89cfdb12015-01-16 18:02:15 +01001512 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001513 dma_addr_t iova, iova_base;
1514 int ret = 0;
1515 unsigned int count;
1516 struct scatterlist *s;
Andreas Herrmannc9b24992013-09-27 00:36:15 +02001517 int prot;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001518
1519 size = PAGE_ALIGN(size);
1520 *handle = DMA_ERROR_CODE;
1521
1522 iova_base = iova = __alloc_iova(mapping, size);
1523 if (iova == DMA_ERROR_CODE)
1524 return -ENOMEM;
1525
1526 for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) {
1527 phys_addr_t phys = page_to_phys(sg_page(s));
1528 unsigned int len = PAGE_ALIGN(s->offset + s->length);
1529
Rob Herring0fa478d2012-08-21 12:23:23 +02001530 if (!is_coherent &&
1531 !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001532 __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir);
1533
Andreas Herrmannc9b24992013-09-27 00:36:15 +02001534 prot = __dma_direction_to_prot(dir);
1535
1536 ret = iommu_map(mapping->domain, iova, phys, len, prot);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001537 if (ret < 0)
1538 goto fail;
1539 count += len >> PAGE_SHIFT;
1540 iova += len;
1541 }
1542 *handle = iova_base;
1543
1544 return 0;
1545fail:
1546 iommu_unmap(mapping->domain, iova_base, count * PAGE_SIZE);
1547 __free_iova(mapping, iova_base, size);
1548 return ret;
1549}
1550
Rob Herring0fa478d2012-08-21 12:23:23 +02001551static int __iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents,
1552 enum dma_data_direction dir, struct dma_attrs *attrs,
1553 bool is_coherent)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001554{
1555 struct scatterlist *s = sg, *dma = sg, *start = sg;
1556 int i, count = 0;
1557 unsigned int offset = s->offset;
1558 unsigned int size = s->offset + s->length;
1559 unsigned int max = dma_get_max_seg_size(dev);
1560
1561 for (i = 1; i < nents; i++) {
1562 s = sg_next(s);
1563
1564 s->dma_address = DMA_ERROR_CODE;
1565 s->dma_length = 0;
1566
1567 if (s->offset || (size & ~PAGE_MASK) || size + s->length > max) {
1568 if (__map_sg_chunk(dev, start, size, &dma->dma_address,
Rob Herring0fa478d2012-08-21 12:23:23 +02001569 dir, attrs, is_coherent) < 0)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001570 goto bad_mapping;
1571
1572 dma->dma_address += offset;
1573 dma->dma_length = size - offset;
1574
1575 size = offset = s->offset;
1576 start = s;
1577 dma = sg_next(dma);
1578 count += 1;
1579 }
1580 size += s->length;
1581 }
Rob Herring0fa478d2012-08-21 12:23:23 +02001582 if (__map_sg_chunk(dev, start, size, &dma->dma_address, dir, attrs,
1583 is_coherent) < 0)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001584 goto bad_mapping;
1585
1586 dma->dma_address += offset;
1587 dma->dma_length = size - offset;
1588
1589 return count+1;
1590
1591bad_mapping:
1592 for_each_sg(sg, s, count, i)
1593 __iommu_remove_mapping(dev, sg_dma_address(s), sg_dma_len(s));
1594 return 0;
1595}
1596
1597/**
Rob Herring0fa478d2012-08-21 12:23:23 +02001598 * arm_coherent_iommu_map_sg - map a set of SG buffers for streaming mode DMA
1599 * @dev: valid struct device pointer
1600 * @sg: list of buffers
1601 * @nents: number of buffers to map
1602 * @dir: DMA transfer direction
1603 *
1604 * Map a set of i/o coherent buffers described by scatterlist in streaming
1605 * mode for DMA. The scatter gather list elements are merged together (if
1606 * possible) and tagged with the appropriate dma address and length. They are
1607 * obtained via sg_dma_{address,length}.
1608 */
1609int arm_coherent_iommu_map_sg(struct device *dev, struct scatterlist *sg,
1610 int nents, enum dma_data_direction dir, struct dma_attrs *attrs)
1611{
1612 return __iommu_map_sg(dev, sg, nents, dir, attrs, true);
1613}
1614
1615/**
1616 * arm_iommu_map_sg - map a set of SG buffers for streaming mode DMA
1617 * @dev: valid struct device pointer
1618 * @sg: list of buffers
1619 * @nents: number of buffers to map
1620 * @dir: DMA transfer direction
1621 *
1622 * Map a set of buffers described by scatterlist in streaming mode for DMA.
1623 * The scatter gather list elements are merged together (if possible) and
1624 * tagged with the appropriate dma address and length. They are obtained via
1625 * sg_dma_{address,length}.
1626 */
1627int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg,
1628 int nents, enum dma_data_direction dir, struct dma_attrs *attrs)
1629{
1630 return __iommu_map_sg(dev, sg, nents, dir, attrs, false);
1631}
1632
1633static void __iommu_unmap_sg(struct device *dev, struct scatterlist *sg,
1634 int nents, enum dma_data_direction dir, struct dma_attrs *attrs,
1635 bool is_coherent)
1636{
1637 struct scatterlist *s;
1638 int i;
1639
1640 for_each_sg(sg, s, nents, i) {
1641 if (sg_dma_len(s))
1642 __iommu_remove_mapping(dev, sg_dma_address(s),
1643 sg_dma_len(s));
1644 if (!is_coherent &&
1645 !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
1646 __dma_page_dev_to_cpu(sg_page(s), s->offset,
1647 s->length, dir);
1648 }
1649}
1650
1651/**
1652 * arm_coherent_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
1653 * @dev: valid struct device pointer
1654 * @sg: list of buffers
1655 * @nents: number of buffers to unmap (same as was passed to dma_map_sg)
1656 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
1657 *
1658 * Unmap a set of streaming mode DMA translations. Again, CPU access
1659 * rules concerning calls here are the same as for dma_unmap_single().
1660 */
1661void arm_coherent_iommu_unmap_sg(struct device *dev, struct scatterlist *sg,
1662 int nents, enum dma_data_direction dir, struct dma_attrs *attrs)
1663{
1664 __iommu_unmap_sg(dev, sg, nents, dir, attrs, true);
1665}
1666
1667/**
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001668 * arm_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
1669 * @dev: valid struct device pointer
1670 * @sg: list of buffers
1671 * @nents: number of buffers to unmap (same as was passed to dma_map_sg)
1672 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
1673 *
1674 * Unmap a set of streaming mode DMA translations. Again, CPU access
1675 * rules concerning calls here are the same as for dma_unmap_single().
1676 */
1677void arm_iommu_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
1678 enum dma_data_direction dir, struct dma_attrs *attrs)
1679{
Rob Herring0fa478d2012-08-21 12:23:23 +02001680 __iommu_unmap_sg(dev, sg, nents, dir, attrs, false);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001681}
1682
1683/**
1684 * arm_iommu_sync_sg_for_cpu
1685 * @dev: valid struct device pointer
1686 * @sg: list of buffers
1687 * @nents: number of buffers to map (returned from dma_map_sg)
1688 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
1689 */
1690void arm_iommu_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
1691 int nents, enum dma_data_direction dir)
1692{
1693 struct scatterlist *s;
1694 int i;
1695
1696 for_each_sg(sg, s, nents, i)
Rob Herring0fa478d2012-08-21 12:23:23 +02001697 __dma_page_dev_to_cpu(sg_page(s), s->offset, s->length, dir);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001698
1699}
1700
1701/**
1702 * arm_iommu_sync_sg_for_device
1703 * @dev: valid struct device pointer
1704 * @sg: list of buffers
1705 * @nents: number of buffers to map (returned from dma_map_sg)
1706 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
1707 */
1708void arm_iommu_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
1709 int nents, enum dma_data_direction dir)
1710{
1711 struct scatterlist *s;
1712 int i;
1713
1714 for_each_sg(sg, s, nents, i)
Rob Herring0fa478d2012-08-21 12:23:23 +02001715 __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001716}
1717
1718
1719/**
Rob Herring0fa478d2012-08-21 12:23:23 +02001720 * arm_coherent_iommu_map_page
1721 * @dev: valid struct device pointer
1722 * @page: page that buffer resides in
1723 * @offset: offset into page for start of buffer
1724 * @size: size of buffer to map
1725 * @dir: DMA transfer direction
1726 *
1727 * Coherent IOMMU aware version of arm_dma_map_page()
1728 */
1729static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *page,
1730 unsigned long offset, size_t size, enum dma_data_direction dir,
1731 struct dma_attrs *attrs)
1732{
Will Deacon89cfdb12015-01-16 18:02:15 +01001733 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Rob Herring0fa478d2012-08-21 12:23:23 +02001734 dma_addr_t dma_addr;
Will Deacon13987d62013-06-10 19:34:39 +01001735 int ret, prot, len = PAGE_ALIGN(size + offset);
Rob Herring0fa478d2012-08-21 12:23:23 +02001736
1737 dma_addr = __alloc_iova(mapping, len);
1738 if (dma_addr == DMA_ERROR_CODE)
1739 return dma_addr;
1740
Andreas Herrmannc9b24992013-09-27 00:36:15 +02001741 prot = __dma_direction_to_prot(dir);
Will Deacon13987d62013-06-10 19:34:39 +01001742
1743 ret = iommu_map(mapping->domain, dma_addr, page_to_phys(page), len, prot);
Rob Herring0fa478d2012-08-21 12:23:23 +02001744 if (ret < 0)
1745 goto fail;
1746
1747 return dma_addr + offset;
1748fail:
1749 __free_iova(mapping, dma_addr, len);
1750 return DMA_ERROR_CODE;
1751}
1752
1753/**
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001754 * arm_iommu_map_page
1755 * @dev: valid struct device pointer
1756 * @page: page that buffer resides in
1757 * @offset: offset into page for start of buffer
1758 * @size: size of buffer to map
1759 * @dir: DMA transfer direction
1760 *
1761 * IOMMU aware version of arm_dma_map_page()
1762 */
1763static dma_addr_t arm_iommu_map_page(struct device *dev, struct page *page,
1764 unsigned long offset, size_t size, enum dma_data_direction dir,
1765 struct dma_attrs *attrs)
1766{
Rob Herring0fa478d2012-08-21 12:23:23 +02001767 if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001768 __dma_page_cpu_to_dev(page, offset, size, dir);
1769
Rob Herring0fa478d2012-08-21 12:23:23 +02001770 return arm_coherent_iommu_map_page(dev, page, offset, size, dir, attrs);
1771}
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001772
Rob Herring0fa478d2012-08-21 12:23:23 +02001773/**
1774 * arm_coherent_iommu_unmap_page
1775 * @dev: valid struct device pointer
1776 * @handle: DMA address of buffer
1777 * @size: size of buffer (same as passed to dma_map_page)
1778 * @dir: DMA transfer direction (same as passed to dma_map_page)
1779 *
1780 * Coherent IOMMU aware version of arm_dma_unmap_page()
1781 */
1782static void arm_coherent_iommu_unmap_page(struct device *dev, dma_addr_t handle,
1783 size_t size, enum dma_data_direction dir,
1784 struct dma_attrs *attrs)
1785{
Will Deacon89cfdb12015-01-16 18:02:15 +01001786 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Rob Herring0fa478d2012-08-21 12:23:23 +02001787 dma_addr_t iova = handle & PAGE_MASK;
Rob Herring0fa478d2012-08-21 12:23:23 +02001788 int offset = handle & ~PAGE_MASK;
1789 int len = PAGE_ALIGN(size + offset);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001790
Rob Herring0fa478d2012-08-21 12:23:23 +02001791 if (!iova)
1792 return;
1793
1794 iommu_unmap(mapping->domain, iova, len);
1795 __free_iova(mapping, iova, len);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001796}
1797
1798/**
1799 * arm_iommu_unmap_page
1800 * @dev: valid struct device pointer
1801 * @handle: DMA address of buffer
1802 * @size: size of buffer (same as passed to dma_map_page)
1803 * @dir: DMA transfer direction (same as passed to dma_map_page)
1804 *
1805 * IOMMU aware version of arm_dma_unmap_page()
1806 */
1807static void arm_iommu_unmap_page(struct device *dev, dma_addr_t handle,
1808 size_t size, enum dma_data_direction dir,
1809 struct dma_attrs *attrs)
1810{
Will Deacon89cfdb12015-01-16 18:02:15 +01001811 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001812 dma_addr_t iova = handle & PAGE_MASK;
1813 struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));
1814 int offset = handle & ~PAGE_MASK;
1815 int len = PAGE_ALIGN(size + offset);
1816
1817 if (!iova)
1818 return;
1819
Rob Herring0fa478d2012-08-21 12:23:23 +02001820 if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001821 __dma_page_dev_to_cpu(page, offset, size, dir);
1822
1823 iommu_unmap(mapping->domain, iova, len);
1824 __free_iova(mapping, iova, len);
1825}
1826
1827static void arm_iommu_sync_single_for_cpu(struct device *dev,
1828 dma_addr_t handle, size_t size, enum dma_data_direction dir)
1829{
Will Deacon89cfdb12015-01-16 18:02:15 +01001830 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001831 dma_addr_t iova = handle & PAGE_MASK;
1832 struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));
1833 unsigned int offset = handle & ~PAGE_MASK;
1834
1835 if (!iova)
1836 return;
1837
Rob Herring0fa478d2012-08-21 12:23:23 +02001838 __dma_page_dev_to_cpu(page, offset, size, dir);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001839}
1840
1841static void arm_iommu_sync_single_for_device(struct device *dev,
1842 dma_addr_t handle, size_t size, enum dma_data_direction dir)
1843{
Will Deacon89cfdb12015-01-16 18:02:15 +01001844 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001845 dma_addr_t iova = handle & PAGE_MASK;
1846 struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));
1847 unsigned int offset = handle & ~PAGE_MASK;
1848
1849 if (!iova)
1850 return;
1851
1852 __dma_page_cpu_to_dev(page, offset, size, dir);
1853}
1854
1855struct dma_map_ops iommu_ops = {
1856 .alloc = arm_iommu_alloc_attrs,
1857 .free = arm_iommu_free_attrs,
1858 .mmap = arm_iommu_mmap_attrs,
Marek Szyprowskidc2832e2012-06-13 10:01:15 +02001859 .get_sgtable = arm_iommu_get_sgtable,
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001860
1861 .map_page = arm_iommu_map_page,
1862 .unmap_page = arm_iommu_unmap_page,
1863 .sync_single_for_cpu = arm_iommu_sync_single_for_cpu,
1864 .sync_single_for_device = arm_iommu_sync_single_for_device,
1865
1866 .map_sg = arm_iommu_map_sg,
1867 .unmap_sg = arm_iommu_unmap_sg,
1868 .sync_sg_for_cpu = arm_iommu_sync_sg_for_cpu,
1869 .sync_sg_for_device = arm_iommu_sync_sg_for_device,
Hiroshi Doyud09e1332013-01-29 14:57:07 +02001870
1871 .set_dma_mask = arm_dma_set_mask,
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001872};
1873
Rob Herring0fa478d2012-08-21 12:23:23 +02001874struct dma_map_ops iommu_coherent_ops = {
1875 .alloc = arm_iommu_alloc_attrs,
1876 .free = arm_iommu_free_attrs,
1877 .mmap = arm_iommu_mmap_attrs,
1878 .get_sgtable = arm_iommu_get_sgtable,
1879
1880 .map_page = arm_coherent_iommu_map_page,
1881 .unmap_page = arm_coherent_iommu_unmap_page,
1882
1883 .map_sg = arm_coherent_iommu_map_sg,
1884 .unmap_sg = arm_coherent_iommu_unmap_sg,
Hiroshi Doyud09e1332013-01-29 14:57:07 +02001885
1886 .set_dma_mask = arm_dma_set_mask,
Rob Herring0fa478d2012-08-21 12:23:23 +02001887};
1888
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001889/**
1890 * arm_iommu_create_mapping
1891 * @bus: pointer to the bus holding the client device (for IOMMU calls)
1892 * @base: start address of the valid IO address space
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001893 * @size: maximum size of the valid IO address space
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001894 *
1895 * Creates a mapping structure which holds information about used/unused
1896 * IO address ranges, which is required to perform memory allocation and
1897 * mapping with IOMMU aware functions.
1898 *
1899 * The client device need to be attached to the mapping with
1900 * arm_iommu_attach_device function.
1901 */
1902struct dma_iommu_mapping *
Marek Szyprowski14245322015-04-29 11:29:19 +01001903arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001904{
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001905 unsigned int bits = size >> PAGE_SHIFT;
1906 unsigned int bitmap_size = BITS_TO_LONGS(bits) * sizeof(long);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001907 struct dma_iommu_mapping *mapping;
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001908 int extensions = 1;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001909 int err = -ENOMEM;
1910
Marek Szyprowski14245322015-04-29 11:29:19 +01001911 /* currently only 32-bit DMA address space is supported */
1912 if (size > DMA_BIT_MASK(32) + 1)
1913 return ERR_PTR(-ERANGE);
1914
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001915 if (!bitmap_size)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001916 return ERR_PTR(-EINVAL);
1917
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001918 if (bitmap_size > PAGE_SIZE) {
1919 extensions = bitmap_size / PAGE_SIZE;
1920 bitmap_size = PAGE_SIZE;
1921 }
1922
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001923 mapping = kzalloc(sizeof(struct dma_iommu_mapping), GFP_KERNEL);
1924 if (!mapping)
1925 goto err;
1926
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001927 mapping->bitmap_size = bitmap_size;
1928 mapping->bitmaps = kzalloc(extensions * sizeof(unsigned long *),
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001929 GFP_KERNEL);
1930 if (!mapping->bitmaps)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001931 goto err2;
1932
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001933 mapping->bitmaps[0] = kzalloc(bitmap_size, GFP_KERNEL);
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001934 if (!mapping->bitmaps[0])
1935 goto err3;
1936
1937 mapping->nr_bitmaps = 1;
1938 mapping->extensions = extensions;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001939 mapping->base = base;
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001940 mapping->bits = BITS_PER_BYTE * bitmap_size;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001941
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001942 spin_lock_init(&mapping->lock);
1943
1944 mapping->domain = iommu_domain_alloc(bus);
1945 if (!mapping->domain)
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001946 goto err4;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001947
1948 kref_init(&mapping->kref);
1949 return mapping;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001950err4:
1951 kfree(mapping->bitmaps[0]);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001952err3:
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001953 kfree(mapping->bitmaps);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001954err2:
1955 kfree(mapping);
1956err:
1957 return ERR_PTR(err);
1958}
Prathyush K18177d12013-01-04 06:22:42 -05001959EXPORT_SYMBOL_GPL(arm_iommu_create_mapping);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001960
1961static void release_iommu_mapping(struct kref *kref)
1962{
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001963 int i;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001964 struct dma_iommu_mapping *mapping =
1965 container_of(kref, struct dma_iommu_mapping, kref);
1966
1967 iommu_domain_free(mapping->domain);
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001968 for (i = 0; i < mapping->nr_bitmaps; i++)
1969 kfree(mapping->bitmaps[i]);
1970 kfree(mapping->bitmaps);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001971 kfree(mapping);
1972}
1973
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001974static int extend_iommu_mapping(struct dma_iommu_mapping *mapping)
1975{
1976 int next_bitmap;
1977
1978 if (mapping->nr_bitmaps > mapping->extensions)
1979 return -EINVAL;
1980
1981 next_bitmap = mapping->nr_bitmaps;
1982 mapping->bitmaps[next_bitmap] = kzalloc(mapping->bitmap_size,
1983 GFP_ATOMIC);
1984 if (!mapping->bitmaps[next_bitmap])
1985 return -ENOMEM;
1986
1987 mapping->nr_bitmaps++;
1988
1989 return 0;
1990}
1991
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001992void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping)
1993{
1994 if (mapping)
1995 kref_put(&mapping->kref, release_iommu_mapping);
1996}
Prathyush K18177d12013-01-04 06:22:42 -05001997EXPORT_SYMBOL_GPL(arm_iommu_release_mapping);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001998
Laurent Pincharteab8d652015-01-23 16:21:49 +02001999static int __arm_iommu_attach_device(struct device *dev,
2000 struct dma_iommu_mapping *mapping)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02002001{
2002 int err;
2003
2004 err = iommu_attach_device(mapping->domain, dev);
2005 if (err)
2006 return err;
2007
2008 kref_get(&mapping->kref);
Will Deacon89cfdb12015-01-16 18:02:15 +01002009 to_dma_iommu_mapping(dev) = mapping;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02002010
Hiroshi Doyu75c59712012-09-11 07:39:48 +02002011 pr_debug("Attached IOMMU controller to %s device.\n", dev_name(dev));
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02002012 return 0;
2013}
2014
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002015/**
Laurent Pincharteab8d652015-01-23 16:21:49 +02002016 * arm_iommu_attach_device
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002017 * @dev: valid struct device pointer
Laurent Pincharteab8d652015-01-23 16:21:49 +02002018 * @mapping: io address space mapping structure (returned from
2019 * arm_iommu_create_mapping)
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002020 *
Laurent Pincharteab8d652015-01-23 16:21:49 +02002021 * Attaches specified io address space mapping to the provided device.
2022 * This replaces the dma operations (dma_map_ops pointer) with the
2023 * IOMMU aware version.
2024 *
2025 * More than one client might be attached to the same io address space
2026 * mapping.
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002027 */
Laurent Pincharteab8d652015-01-23 16:21:49 +02002028int arm_iommu_attach_device(struct device *dev,
2029 struct dma_iommu_mapping *mapping)
2030{
2031 int err;
2032
2033 err = __arm_iommu_attach_device(dev, mapping);
2034 if (err)
2035 return err;
2036
2037 set_dma_ops(dev, &iommu_ops);
2038 return 0;
2039}
2040EXPORT_SYMBOL_GPL(arm_iommu_attach_device);
2041
2042static void __arm_iommu_detach_device(struct device *dev)
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002043{
2044 struct dma_iommu_mapping *mapping;
2045
2046 mapping = to_dma_iommu_mapping(dev);
2047 if (!mapping) {
2048 dev_warn(dev, "Not attached\n");
2049 return;
2050 }
2051
2052 iommu_detach_device(mapping->domain, dev);
2053 kref_put(&mapping->kref, release_iommu_mapping);
Will Deacon89cfdb12015-01-16 18:02:15 +01002054 to_dma_iommu_mapping(dev) = NULL;
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002055
2056 pr_debug("Detached IOMMU controller from %s device.\n", dev_name(dev));
2057}
Laurent Pincharteab8d652015-01-23 16:21:49 +02002058
2059/**
2060 * arm_iommu_detach_device
2061 * @dev: valid struct device pointer
2062 *
2063 * Detaches the provided device from a previously attached map.
2064 * This voids the dma operations (dma_map_ops pointer)
2065 */
2066void arm_iommu_detach_device(struct device *dev)
2067{
2068 __arm_iommu_detach_device(dev);
2069 set_dma_ops(dev, NULL);
2070}
Prathyush K18177d12013-01-04 06:22:42 -05002071EXPORT_SYMBOL_GPL(arm_iommu_detach_device);
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002072
Will Deacon4bb25782014-08-27 17:52:44 +01002073static struct dma_map_ops *arm_get_iommu_dma_map_ops(bool coherent)
2074{
2075 return coherent ? &iommu_coherent_ops : &iommu_ops;
2076}
2077
2078static bool arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size,
2079 struct iommu_ops *iommu)
2080{
2081 struct dma_iommu_mapping *mapping;
2082
2083 if (!iommu)
2084 return false;
2085
2086 mapping = arm_iommu_create_mapping(dev->bus, dma_base, size);
2087 if (IS_ERR(mapping)) {
2088 pr_warn("Failed to create %llu-byte IOMMU mapping for device %s\n",
2089 size, dev_name(dev));
2090 return false;
2091 }
2092
Laurent Pincharteab8d652015-01-23 16:21:49 +02002093 if (__arm_iommu_attach_device(dev, mapping)) {
Will Deacon4bb25782014-08-27 17:52:44 +01002094 pr_warn("Failed to attached device %s to IOMMU_mapping\n",
2095 dev_name(dev));
2096 arm_iommu_release_mapping(mapping);
2097 return false;
2098 }
2099
2100 return true;
2101}
2102
2103static void arm_teardown_iommu_dma_ops(struct device *dev)
2104{
Will Deacon89cfdb12015-01-16 18:02:15 +01002105 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Will Deacon4bb25782014-08-27 17:52:44 +01002106
Will Deaconc2273a12015-01-16 18:01:43 +01002107 if (!mapping)
2108 return;
2109
Laurent Pincharteab8d652015-01-23 16:21:49 +02002110 __arm_iommu_detach_device(dev);
Will Deacon4bb25782014-08-27 17:52:44 +01002111 arm_iommu_release_mapping(mapping);
2112}
2113
2114#else
2115
2116static bool arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size,
2117 struct iommu_ops *iommu)
2118{
2119 return false;
2120}
2121
2122static void arm_teardown_iommu_dma_ops(struct device *dev) { }
2123
2124#define arm_get_iommu_dma_map_ops arm_get_dma_map_ops
2125
2126#endif /* CONFIG_ARM_DMA_USE_IOMMU */
2127
2128static struct dma_map_ops *arm_get_dma_map_ops(bool coherent)
2129{
2130 return coherent ? &arm_coherent_dma_ops : &arm_dma_ops;
2131}
2132
2133void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
2134 struct iommu_ops *iommu, bool coherent)
2135{
2136 struct dma_map_ops *dma_ops;
2137
Linus Torvalds6f51ee72014-12-16 14:53:01 -08002138 dev->archdata.dma_coherent = coherent;
Will Deacon4bb25782014-08-27 17:52:44 +01002139 if (arm_setup_iommu_dma_ops(dev, dma_base, size, iommu))
2140 dma_ops = arm_get_iommu_dma_map_ops(coherent);
2141 else
2142 dma_ops = arm_get_dma_map_ops(coherent);
2143
2144 set_dma_ops(dev, dma_ops);
2145}
2146
2147void arch_teardown_dma_ops(struct device *dev)
2148{
2149 arm_teardown_iommu_dma_ops(dev);
2150}