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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);
Mel Gormand0164ad2015-11-06 16:28:21 -0800654 else if (dev_get_cma_area(dev) && (gfp & __GFP_DIRECT_RECLAIM))
Lorenzo Nava21caf3a2015-07-02 17:28:03 +0100655 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);
Mel Gormand0164ad2015-11-06 16:28:21 -0800659 else if (!gfpflags_allow_blocking(gfp))
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
Rob Herringdd37e942012-08-21 12:20:17 +0200680 return __dma_alloc(dev, size, handle, gfp, prot, false,
Carlo Caione6e8266e2015-02-09 10:38:35 +0100681 attrs, __builtin_return_address(0));
Rob Herringdd37e942012-08-21 12:20:17 +0200682}
683
684static void *arm_coherent_dma_alloc(struct device *dev, size_t size,
685 dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs)
686{
Lorenzo Nava21caf3a2015-07-02 17:28:03 +0100687 return __dma_alloc(dev, size, handle, gfp, PAGE_KERNEL, true,
Carlo Caione6e8266e2015-02-09 10:38:35 +0100688 attrs, __builtin_return_address(0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
Mike Looijmans55af8a92015-06-03 11:25:31 +0100691static int __arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
Marek Szyprowskif99d6032012-05-16 18:31:23 +0200692 void *cpu_addr, dma_addr_t dma_addr, size_t size,
693 struct dma_attrs *attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694{
Catalin Marinasab6494f2009-07-24 12:35:02 +0100695 int ret = -ENXIO;
696#ifdef CONFIG_MMU
Marek Szyprowski50262a42012-07-30 09:35:26 +0200697 unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
698 unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100699 unsigned long pfn = dma_to_pfn(dev, dma_addr);
Marek Szyprowski50262a42012-07-30 09:35:26 +0200700 unsigned long off = vma->vm_pgoff;
701
Marek Szyprowski47142f02012-05-15 19:04:13 +0200702 if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
703 return ret;
704
Marek Szyprowski50262a42012-07-30 09:35:26 +0200705 if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
706 ret = remap_pfn_range(vma, vma->vm_start,
707 pfn + off,
708 vma->vm_end - vma->vm_start,
709 vma->vm_page_prot);
710 }
Catalin Marinasab6494f2009-07-24 12:35:02 +0100711#endif /* CONFIG_MMU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
713 return ret;
714}
715
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716/*
Mike Looijmans55af8a92015-06-03 11:25:31 +0100717 * Create userspace mapping for the DMA-coherent memory.
718 */
719static int arm_coherent_dma_mmap(struct device *dev, struct vm_area_struct *vma,
720 void *cpu_addr, dma_addr_t dma_addr, size_t size,
721 struct dma_attrs *attrs)
722{
723 return __arm_dma_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
724}
725
726int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
727 void *cpu_addr, dma_addr_t dma_addr, size_t size,
728 struct dma_attrs *attrs)
729{
730#ifdef CONFIG_MMU
731 vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot);
732#endif /* CONFIG_MMU */
733 return __arm_dma_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
734}
735
736/*
Marek Szyprowskic7909502011-12-29 13:09:51 +0100737 * Free a buffer as defined by the above mapping.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 */
Rob Herringdd37e942012-08-21 12:20:17 +0200739static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
740 dma_addr_t handle, struct dma_attrs *attrs,
741 bool is_coherent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742{
Marek Szyprowskic7909502011-12-29 13:09:51 +0100743 struct page *page = pfn_to_page(dma_to_pfn(dev, handle));
Carlo Caione6e8266e2015-02-09 10:38:35 +0100744 bool want_vaddr = !dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs);
Russell King5edf71a2005-11-25 15:52:51 +0000745
Russell King3e82d012009-11-19 15:38:12 +0000746 size = PAGE_ALIGN(size);
747
Lorenzo Nava21caf3a2015-07-02 17:28:03 +0100748 if (nommu()) {
Marek Szyprowskic7909502011-12-29 13:09:51 +0100749 __dma_free_buffer(page, size);
Lorenzo Nava21caf3a2015-07-02 17:28:03 +0100750 } else if (!is_coherent && __free_from_pool(cpu_addr, size)) {
Aaro Koskinend9e0d142012-08-07 14:44:05 +0200751 return;
Gioh Kime464ef12014-05-22 13:38:23 +0900752 } else if (!dev_get_cma_area(dev)) {
Lorenzo Nava21caf3a2015-07-02 17:28:03 +0100753 if (want_vaddr && !is_coherent)
Carlo Caione6e8266e2015-02-09 10:38:35 +0100754 __dma_free_remap(cpu_addr, size);
Marek Szyprowskic7909502011-12-29 13:09:51 +0100755 __dma_free_buffer(page, size);
756 } else {
Marek Szyprowskic7909502011-12-29 13:09:51 +0100757 /*
758 * Non-atomic allocations cannot be freed with IRQs disabled
759 */
760 WARN_ON(irqs_disabled());
Carlo Caione6e8266e2015-02-09 10:38:35 +0100761 __free_from_contiguous(dev, page, cpu_addr, size, want_vaddr);
Marek Szyprowskic7909502011-12-29 13:09:51 +0100762 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763}
Russell Kingafd1a322008-09-25 16:30:57 +0100764
Rob Herringdd37e942012-08-21 12:20:17 +0200765void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
766 dma_addr_t handle, struct dma_attrs *attrs)
767{
768 __arm_dma_free(dev, size, cpu_addr, handle, attrs, false);
769}
770
771static void arm_coherent_dma_free(struct device *dev, size_t size, void *cpu_addr,
772 dma_addr_t handle, struct dma_attrs *attrs)
773{
774 __arm_dma_free(dev, size, cpu_addr, handle, attrs, true);
775}
776
Marek Szyprowskidc2832e2012-06-13 10:01:15 +0200777int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
778 void *cpu_addr, dma_addr_t handle, size_t size,
779 struct dma_attrs *attrs)
780{
781 struct page *page = pfn_to_page(dma_to_pfn(dev, handle));
782 int ret;
783
784 ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
785 if (unlikely(ret))
786 return ret;
787
788 sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
789 return 0;
790}
791
Russell King65af1912009-11-24 17:53:33 +0000792static void dma_cache_maint_page(struct page *page, unsigned long offset,
Russell Kinga9c91472009-11-26 16:19:58 +0000793 size_t size, enum dma_data_direction dir,
794 void (*op)(const void *, size_t, int))
Russell King65af1912009-11-24 17:53:33 +0000795{
Russell King15653372013-01-19 11:05:57 +0000796 unsigned long pfn;
797 size_t left = size;
798
799 pfn = page_to_pfn(page) + offset / PAGE_SIZE;
800 offset %= PAGE_SIZE;
801
Russell King65af1912009-11-24 17:53:33 +0000802 /*
803 * A single sg entry may refer to multiple physically contiguous
804 * pages. But we still need to process highmem pages individually.
805 * If highmem is not configured then the bulk of this loop gets
806 * optimized out.
807 */
Russell King65af1912009-11-24 17:53:33 +0000808 do {
809 size_t len = left;
Russell King93f1d622009-11-24 14:41:01 +0000810 void *vaddr;
811
Russell King15653372013-01-19 11:05:57 +0000812 page = pfn_to_page(pfn);
813
Russell King93f1d622009-11-24 14:41:01 +0000814 if (PageHighMem(page)) {
Russell King15653372013-01-19 11:05:57 +0000815 if (len + offset > PAGE_SIZE)
Russell King93f1d622009-11-24 14:41:01 +0000816 len = PAGE_SIZE - offset;
Joonsoo Kimdd0f67f2013-04-05 03:16:14 +0100817
818 if (cache_is_vipt_nonaliasing()) {
Nicolas Pitre39af22a2010-12-15 15:14:45 -0500819 vaddr = kmap_atomic(page);
Nicolas Pitre7e5a69e2010-03-29 21:46:02 +0100820 op(vaddr + offset, len, dir);
Nicolas Pitre39af22a2010-12-15 15:14:45 -0500821 kunmap_atomic(vaddr);
Joonsoo Kimdd0f67f2013-04-05 03:16:14 +0100822 } else {
823 vaddr = kmap_high_get(page);
824 if (vaddr) {
825 op(vaddr + offset, len, dir);
826 kunmap_high(page);
827 }
Russell King93f1d622009-11-24 14:41:01 +0000828 }
829 } else {
830 vaddr = page_address(page) + offset;
Russell Kinga9c91472009-11-26 16:19:58 +0000831 op(vaddr, len, dir);
Russell King65af1912009-11-24 17:53:33 +0000832 }
Russell King65af1912009-11-24 17:53:33 +0000833 offset = 0;
Russell King15653372013-01-19 11:05:57 +0000834 pfn++;
Russell King65af1912009-11-24 17:53:33 +0000835 left -= len;
836 } while (left);
837}
838
Marek Szyprowski51fde3492012-02-10 19:55:20 +0100839/*
840 * Make an area consistent for devices.
841 * Note: Drivers should NOT use this function directly, as it will break
842 * platforms with CONFIG_DMABOUNCE.
843 * Use the driver DMA support - see dma-mapping.h (dma_sync_*)
844 */
845static void __dma_page_cpu_to_dev(struct page *page, unsigned long off,
Russell King65af1912009-11-24 17:53:33 +0000846 size_t size, enum dma_data_direction dir)
847{
Santosh Shilimkar2161c242014-04-24 11:30:07 -0400848 phys_addr_t paddr;
Nicolas Pitre43377452009-03-12 22:52:09 -0400849
Russell Kinga9c91472009-11-26 16:19:58 +0000850 dma_cache_maint_page(page, off, size, dir, dmac_map_area);
Nicolas Pitre43377452009-03-12 22:52:09 -0400851
Russell King65af1912009-11-24 17:53:33 +0000852 paddr = page_to_phys(page) + off;
Russell King2ffe2da2009-10-31 16:52:16 +0000853 if (dir == DMA_FROM_DEVICE) {
854 outer_inv_range(paddr, paddr + size);
855 } else {
856 outer_clean_range(paddr, paddr + size);
857 }
858 /* FIXME: non-speculating: flush on bidirectional mappings? */
Nicolas Pitre43377452009-03-12 22:52:09 -0400859}
Russell King4ea0d732009-11-24 16:27:17 +0000860
Marek Szyprowski51fde3492012-02-10 19:55:20 +0100861static void __dma_page_dev_to_cpu(struct page *page, unsigned long off,
Russell King4ea0d732009-11-24 16:27:17 +0000862 size_t size, enum dma_data_direction dir)
863{
Santosh Shilimkar2161c242014-04-24 11:30:07 -0400864 phys_addr_t paddr = page_to_phys(page) + off;
Russell King2ffe2da2009-10-31 16:52:16 +0000865
866 /* FIXME: non-speculating: not required */
Russell Kingdeace4a2014-05-03 11:06:55 +0100867 /* in any case, don't bother invalidating if DMA to device */
868 if (dir != DMA_TO_DEVICE) {
Russell King2ffe2da2009-10-31 16:52:16 +0000869 outer_inv_range(paddr, paddr + size);
870
Russell Kingdeace4a2014-05-03 11:06:55 +0100871 dma_cache_maint_page(page, off, size, dir, dmac_unmap_area);
872 }
Catalin Marinasc0177802010-09-13 15:57:36 +0100873
874 /*
Ming Leib2a234e2013-05-18 11:21:36 +0100875 * Mark the D-cache clean for these pages to avoid extra flushing.
Catalin Marinasc0177802010-09-13 15:57:36 +0100876 */
Ming Leib2a234e2013-05-18 11:21:36 +0100877 if (dir != DMA_TO_DEVICE && size >= PAGE_SIZE) {
878 unsigned long pfn;
879 size_t left = size;
880
881 pfn = page_to_pfn(page) + off / PAGE_SIZE;
882 off %= PAGE_SIZE;
883 if (off) {
884 pfn++;
885 left -= PAGE_SIZE - off;
886 }
887 while (left >= PAGE_SIZE) {
888 page = pfn_to_page(pfn++);
889 set_bit(PG_dcache_clean, &page->flags);
890 left -= PAGE_SIZE;
891 }
892 }
Russell King4ea0d732009-11-24 16:27:17 +0000893}
Nicolas Pitre43377452009-03-12 22:52:09 -0400894
Russell Kingafd1a322008-09-25 16:30:57 +0100895/**
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100896 * arm_dma_map_sg - map a set of SG buffers for streaming mode DMA
Russell Kingafd1a322008-09-25 16:30:57 +0100897 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
898 * @sg: list of buffers
899 * @nents: number of buffers to map
900 * @dir: DMA transfer direction
901 *
902 * Map a set of buffers described by scatterlist in streaming mode for DMA.
903 * This is the scatter-gather version of the dma_map_single interface.
904 * Here the scatter gather list elements are each tagged with the
905 * appropriate dma address and length. They are obtained via
906 * sg_dma_{address,length}.
907 *
908 * Device ownership issues as mentioned for dma_map_single are the same
909 * here.
910 */
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100911int arm_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
912 enum dma_data_direction dir, struct dma_attrs *attrs)
Russell Kingafd1a322008-09-25 16:30:57 +0100913{
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100914 struct dma_map_ops *ops = get_dma_ops(dev);
Russell Kingafd1a322008-09-25 16:30:57 +0100915 struct scatterlist *s;
Russell King01135d922008-09-25 21:05:02 +0100916 int i, j;
Russell Kingafd1a322008-09-25 16:30:57 +0100917
918 for_each_sg(sg, s, nents, i) {
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +0200919#ifdef CONFIG_NEED_SG_DMA_LENGTH
920 s->dma_length = s->length;
921#endif
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100922 s->dma_address = ops->map_page(dev, sg_page(s), s->offset,
923 s->length, dir, attrs);
Russell King01135d922008-09-25 21:05:02 +0100924 if (dma_mapping_error(dev, s->dma_address))
925 goto bad_mapping;
Russell Kingafd1a322008-09-25 16:30:57 +0100926 }
Russell Kingafd1a322008-09-25 16:30:57 +0100927 return nents;
Russell King01135d922008-09-25 21:05:02 +0100928
929 bad_mapping:
930 for_each_sg(sg, s, i, j)
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100931 ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs);
Russell King01135d922008-09-25 21:05:02 +0100932 return 0;
Russell Kingafd1a322008-09-25 16:30:57 +0100933}
Russell Kingafd1a322008-09-25 16:30:57 +0100934
935/**
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100936 * arm_dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
Russell Kingafd1a322008-09-25 16:30:57 +0100937 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
938 * @sg: list of buffers
Linus Walleij0adfca62011-01-12 18:50:37 +0100939 * @nents: number of buffers to unmap (same as was passed to dma_map_sg)
Russell Kingafd1a322008-09-25 16:30:57 +0100940 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
941 *
942 * Unmap a set of streaming mode DMA translations. Again, CPU access
943 * rules concerning calls here are the same as for dma_unmap_single().
944 */
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100945void arm_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
946 enum dma_data_direction dir, struct dma_attrs *attrs)
Russell Kingafd1a322008-09-25 16:30:57 +0100947{
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100948 struct dma_map_ops *ops = get_dma_ops(dev);
Russell King01135d922008-09-25 21:05:02 +0100949 struct scatterlist *s;
Russell King01135d922008-09-25 21:05:02 +0100950
Russell King01135d922008-09-25 21:05:02 +0100951 int i;
Russell King24056f52011-01-03 11:29:28 +0000952
Russell King01135d922008-09-25 21:05:02 +0100953 for_each_sg(sg, s, nents, i)
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100954 ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs);
Russell Kingafd1a322008-09-25 16:30:57 +0100955}
Russell Kingafd1a322008-09-25 16:30:57 +0100956
957/**
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100958 * arm_dma_sync_sg_for_cpu
Russell Kingafd1a322008-09-25 16:30:57 +0100959 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
960 * @sg: list of buffers
961 * @nents: number of buffers to map (returned from dma_map_sg)
962 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
963 */
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100964void arm_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
Russell Kingafd1a322008-09-25 16:30:57 +0100965 int nents, enum dma_data_direction dir)
966{
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100967 struct dma_map_ops *ops = get_dma_ops(dev);
Russell Kingafd1a322008-09-25 16:30:57 +0100968 struct scatterlist *s;
969 int i;
970
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100971 for_each_sg(sg, s, nents, i)
972 ops->sync_single_for_cpu(dev, sg_dma_address(s), s->length,
973 dir);
Russell Kingafd1a322008-09-25 16:30:57 +0100974}
Russell Kingafd1a322008-09-25 16:30:57 +0100975
976/**
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100977 * arm_dma_sync_sg_for_device
Russell Kingafd1a322008-09-25 16:30:57 +0100978 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
979 * @sg: list of buffers
980 * @nents: number of buffers to map (returned from dma_map_sg)
981 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
982 */
Marek Szyprowski2dc6a012012-02-10 19:55:20 +0100983void arm_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
Russell Kingafd1a322008-09-25 16:30:57 +0100984 int nents, enum dma_data_direction dir)
985{
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100986 struct dma_map_ops *ops = get_dma_ops(dev);
Russell Kingafd1a322008-09-25 16:30:57 +0100987 struct scatterlist *s;
988 int i;
989
Marek Szyprowski2a550e72012-02-10 19:55:20 +0100990 for_each_sg(sg, s, nents, i)
991 ops->sync_single_for_device(dev, sg_dma_address(s), s->length,
992 dir);
Russell Kingafd1a322008-09-25 16:30:57 +0100993}
Russell King24056f52011-01-03 11:29:28 +0000994
Russell King022ae532011-07-08 21:26:59 +0100995/*
996 * Return whether the given device DMA address mask can be supported
997 * properly. For example, if your device can only drive the low 24-bits
998 * during bus mastering, then you would pass 0x00ffffff as the mask
999 * to this function.
1000 */
1001int dma_supported(struct device *dev, u64 mask)
1002{
Russell King9f28cde2013-12-06 12:30:42 +00001003 return __dma_supported(dev, mask, false);
Russell King022ae532011-07-08 21:26:59 +01001004}
1005EXPORT_SYMBOL(dma_supported);
1006
Gregory CLEMENT87b54e72012-11-21 09:39:19 +01001007int arm_dma_set_mask(struct device *dev, u64 dma_mask)
Russell King022ae532011-07-08 21:26:59 +01001008{
1009 if (!dev->dma_mask || !dma_supported(dev, dma_mask))
1010 return -EIO;
1011
Russell King022ae532011-07-08 21:26:59 +01001012 *dev->dma_mask = dma_mask;
Russell King022ae532011-07-08 21:26:59 +01001013
1014 return 0;
1015}
Russell King022ae532011-07-08 21:26:59 +01001016
Russell King24056f52011-01-03 11:29:28 +00001017#define PREALLOC_DMA_DEBUG_ENTRIES 4096
1018
1019static int __init dma_debug_do_init(void)
1020{
1021 dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
1022 return 0;
1023}
1024fs_initcall(dma_debug_do_init);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001025
1026#ifdef CONFIG_ARM_DMA_USE_IOMMU
1027
1028/* IOMMU */
1029
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001030static int extend_iommu_mapping(struct dma_iommu_mapping *mapping);
1031
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001032static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping,
1033 size_t size)
1034{
1035 unsigned int order = get_order(size);
1036 unsigned int align = 0;
1037 unsigned int count, start;
Ritesh Harjani006f8412014-05-20 10:02:59 +05301038 size_t mapping_size = mapping->bits << PAGE_SHIFT;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001039 unsigned long flags;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001040 dma_addr_t iova;
1041 int i;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001042
Seung-Woo Kim60460ab2013-02-06 13:21:14 +09001043 if (order > CONFIG_ARM_DMA_IOMMU_ALIGNMENT)
1044 order = CONFIG_ARM_DMA_IOMMU_ALIGNMENT;
1045
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001046 count = PAGE_ALIGN(size) >> PAGE_SHIFT;
1047 align = (1 << order) - 1;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001048
1049 spin_lock_irqsave(&mapping->lock, flags);
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001050 for (i = 0; i < mapping->nr_bitmaps; i++) {
1051 start = bitmap_find_next_zero_area(mapping->bitmaps[i],
1052 mapping->bits, 0, count, align);
1053
1054 if (start > mapping->bits)
1055 continue;
1056
1057 bitmap_set(mapping->bitmaps[i], start, count);
1058 break;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001059 }
1060
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001061 /*
1062 * No unused range found. Try to extend the existing mapping
1063 * and perform a second attempt to reserve an IO virtual
1064 * address range of size bytes.
1065 */
1066 if (i == mapping->nr_bitmaps) {
1067 if (extend_iommu_mapping(mapping)) {
1068 spin_unlock_irqrestore(&mapping->lock, flags);
1069 return DMA_ERROR_CODE;
1070 }
1071
1072 start = bitmap_find_next_zero_area(mapping->bitmaps[i],
1073 mapping->bits, 0, count, align);
1074
1075 if (start > mapping->bits) {
1076 spin_unlock_irqrestore(&mapping->lock, flags);
1077 return DMA_ERROR_CODE;
1078 }
1079
1080 bitmap_set(mapping->bitmaps[i], start, count);
1081 }
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001082 spin_unlock_irqrestore(&mapping->lock, flags);
1083
Ritesh Harjani006f8412014-05-20 10:02:59 +05301084 iova = mapping->base + (mapping_size * i);
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001085 iova += start << PAGE_SHIFT;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001086
1087 return iova;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001088}
1089
1090static inline void __free_iova(struct dma_iommu_mapping *mapping,
1091 dma_addr_t addr, size_t size)
1092{
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001093 unsigned int start, count;
Ritesh Harjani006f8412014-05-20 10:02:59 +05301094 size_t mapping_size = mapping->bits << PAGE_SHIFT;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001095 unsigned long flags;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001096 dma_addr_t bitmap_base;
1097 u32 bitmap_index;
1098
1099 if (!size)
1100 return;
1101
Ritesh Harjani006f8412014-05-20 10:02:59 +05301102 bitmap_index = (u32) (addr - mapping->base) / (u32) mapping_size;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001103 BUG_ON(addr < mapping->base || bitmap_index > mapping->extensions);
1104
Ritesh Harjani006f8412014-05-20 10:02:59 +05301105 bitmap_base = mapping->base + mapping_size * bitmap_index;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001106
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001107 start = (addr - bitmap_base) >> PAGE_SHIFT;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001108
Ritesh Harjani006f8412014-05-20 10:02:59 +05301109 if (addr + size > bitmap_base + mapping_size) {
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001110 /*
1111 * The address range to be freed reaches into the iova
1112 * range of the next bitmap. This should not happen as
1113 * we don't allow this in __alloc_iova (at the
1114 * moment).
1115 */
1116 BUG();
1117 } else
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001118 count = size >> PAGE_SHIFT;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001119
1120 spin_lock_irqsave(&mapping->lock, flags);
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001121 bitmap_clear(mapping->bitmaps[bitmap_index], start, count);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001122 spin_unlock_irqrestore(&mapping->lock, flags);
1123}
1124
Doug Anderson33298ef2016-01-29 23:06:08 +01001125/* We'll try 2M, 1M, 64K, and finally 4K; array must end with 0! */
1126static const int iommu_order_array[] = { 9, 8, 4, 0 };
1127
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001128static struct page **__iommu_alloc_buffer(struct device *dev, size_t size,
1129 gfp_t gfp, struct dma_attrs *attrs)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001130{
1131 struct page **pages;
1132 int count = size >> PAGE_SHIFT;
1133 int array_size = count * sizeof(struct page *);
1134 int i = 0;
Doug Anderson33298ef2016-01-29 23:06:08 +01001135 int order_idx = 0;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001136
1137 if (array_size <= PAGE_SIZE)
Alexandre Courbot23be7fd2015-02-19 07:29:58 +01001138 pages = kzalloc(array_size, GFP_KERNEL);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001139 else
1140 pages = vzalloc(array_size);
1141 if (!pages)
1142 return NULL;
1143
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001144 if (dma_get_attr(DMA_ATTR_FORCE_CONTIGUOUS, attrs))
1145 {
1146 unsigned long order = get_order(size);
1147 struct page *page;
1148
1149 page = dma_alloc_from_contiguous(dev, count, order);
1150 if (!page)
1151 goto error;
1152
1153 __dma_clear_buffer(page, size);
1154
1155 for (i = 0; i < count; i++)
1156 pages[i] = page + i;
1157
1158 return pages;
1159 }
1160
Marek Szyprowskif8669be2013-01-16 15:41:02 +01001161 /*
1162 * IOMMU can map any pages, so himem can also be used here
1163 */
1164 gfp |= __GFP_NOWARN | __GFP_HIGHMEM;
1165
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001166 while (count) {
Tomasz Figa49f28aa2015-04-01 07:26:33 +01001167 int j, order;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001168
Doug Anderson33298ef2016-01-29 23:06:08 +01001169 order = iommu_order_array[order_idx];
1170
1171 /* Drop down when we get small */
1172 if (__fls(count) < order) {
1173 order_idx++;
1174 continue;
Tomasz Figa49f28aa2015-04-01 07:26:33 +01001175 }
1176
Doug Anderson33298ef2016-01-29 23:06:08 +01001177 if (order) {
1178 /* See if it's easy to allocate a high-order chunk */
1179 pages[i] = alloc_pages(gfp | __GFP_NORETRY, order);
1180
1181 /* Go down a notch at first sign of pressure */
1182 if (!pages[i]) {
1183 order_idx++;
1184 continue;
1185 }
1186 } else {
Tomasz Figa49f28aa2015-04-01 07:26:33 +01001187 pages[i] = alloc_pages(gfp, 0);
1188 if (!pages[i])
1189 goto error;
1190 }
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001191
Hiroshi Doyu5a796ee2012-09-11 07:39:39 +02001192 if (order) {
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001193 split_page(pages[i], order);
Hiroshi Doyu5a796ee2012-09-11 07:39:39 +02001194 j = 1 << order;
1195 while (--j)
1196 pages[i + j] = pages[i] + j;
1197 }
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001198
1199 __dma_clear_buffer(pages[i], PAGE_SIZE << order);
1200 i += 1 << order;
1201 count -= 1 << order;
1202 }
1203
1204 return pages;
1205error:
Marek Szyprowski9fa8af92012-07-27 17:12:50 +02001206 while (i--)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001207 if (pages[i])
1208 __free_pages(pages[i], 0);
Tetsuo Handa1d5cfdb2016-01-22 15:11:02 -08001209 kvfree(pages);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001210 return NULL;
1211}
1212
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001213static int __iommu_free_buffer(struct device *dev, struct page **pages,
1214 size_t size, struct dma_attrs *attrs)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001215{
1216 int count = size >> PAGE_SHIFT;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001217 int i;
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001218
1219 if (dma_get_attr(DMA_ATTR_FORCE_CONTIGUOUS, attrs)) {
1220 dma_release_from_contiguous(dev, pages[0], count);
1221 } else {
1222 for (i = 0; i < count; i++)
1223 if (pages[i])
1224 __free_pages(pages[i], 0);
1225 }
1226
Tetsuo Handa1d5cfdb2016-01-22 15:11:02 -08001227 kvfree(pages);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001228 return 0;
1229}
1230
1231/*
1232 * Create a CPU mapping for a specified pages
1233 */
1234static void *
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001235__iommu_alloc_remap(struct page **pages, size_t size, gfp_t gfp, pgprot_t prot,
1236 const void *caller)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001237{
Laura Abbott513510d2014-10-09 15:26:40 -07001238 return dma_common_pages_remap(pages, size,
1239 VM_ARM_DMA_CONSISTENT | VM_USERMAP, prot, caller);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001240}
1241
1242/*
1243 * Create a mapping in device IO address space for specified pages
1244 */
1245static dma_addr_t
1246__iommu_create_mapping(struct device *dev, struct page **pages, size_t size)
1247{
Will Deacon89cfdb12015-01-16 18:02:15 +01001248 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001249 unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
1250 dma_addr_t dma_addr, iova;
Andre Przywara90cde552015-09-14 17:49:02 +01001251 int i;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001252
1253 dma_addr = __alloc_iova(mapping, size);
1254 if (dma_addr == DMA_ERROR_CODE)
1255 return dma_addr;
1256
1257 iova = dma_addr;
1258 for (i = 0; i < count; ) {
Andre Przywara90cde552015-09-14 17:49:02 +01001259 int ret;
1260
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001261 unsigned int next_pfn = page_to_pfn(pages[i]) + 1;
1262 phys_addr_t phys = page_to_phys(pages[i]);
1263 unsigned int len, j;
1264
1265 for (j = i + 1; j < count; j++, next_pfn++)
1266 if (page_to_pfn(pages[j]) != next_pfn)
1267 break;
1268
1269 len = (j - i) << PAGE_SHIFT;
Andreas Herrmannc9b24992013-09-27 00:36:15 +02001270 ret = iommu_map(mapping->domain, iova, phys, len,
1271 IOMMU_READ|IOMMU_WRITE);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001272 if (ret < 0)
1273 goto fail;
1274 iova += len;
1275 i = j;
1276 }
1277 return dma_addr;
1278fail:
1279 iommu_unmap(mapping->domain, dma_addr, iova-dma_addr);
1280 __free_iova(mapping, dma_addr, size);
1281 return DMA_ERROR_CODE;
1282}
1283
1284static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t size)
1285{
Will Deacon89cfdb12015-01-16 18:02:15 +01001286 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001287
1288 /*
1289 * add optional in-page offset from iova to size and align
1290 * result to page size
1291 */
1292 size = PAGE_ALIGN((iova & ~PAGE_MASK) + size);
1293 iova &= PAGE_MASK;
1294
1295 iommu_unmap(mapping->domain, iova, size);
1296 __free_iova(mapping, iova, size);
1297 return 0;
1298}
1299
Hiroshi Doyu665bad72012-08-28 08:13:03 +03001300static struct page **__atomic_get_pages(void *addr)
1301{
Laura Abbott36d0fd22014-10-09 15:26:42 -07001302 struct page *page;
1303 phys_addr_t phys;
Hiroshi Doyu665bad72012-08-28 08:13:03 +03001304
Laura Abbott36d0fd22014-10-09 15:26:42 -07001305 phys = gen_pool_virt_to_phys(atomic_pool, (unsigned long)addr);
1306 page = phys_to_page(phys);
1307
1308 return (struct page **)page;
Hiroshi Doyu665bad72012-08-28 08:13:03 +03001309}
1310
Marek Szyprowski955c7572012-05-16 19:38:58 +01001311static struct page **__iommu_get_pages(void *cpu_addr, struct dma_attrs *attrs)
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001312{
1313 struct vm_struct *area;
1314
Hiroshi Doyu665bad72012-08-28 08:13:03 +03001315 if (__in_atomic_pool(cpu_addr, PAGE_SIZE))
1316 return __atomic_get_pages(cpu_addr);
1317
Marek Szyprowski955c7572012-05-16 19:38:58 +01001318 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs))
1319 return cpu_addr;
1320
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001321 area = find_vm_area(cpu_addr);
1322 if (area && (area->flags & VM_ARM_DMA_CONSISTENT))
1323 return area->pages;
1324 return NULL;
1325}
1326
Hiroshi Doyu479ed932012-08-28 08:13:04 +03001327static void *__iommu_alloc_atomic(struct device *dev, size_t size,
1328 dma_addr_t *handle)
1329{
1330 struct page *page;
1331 void *addr;
1332
1333 addr = __alloc_from_pool(size, &page);
1334 if (!addr)
1335 return NULL;
1336
1337 *handle = __iommu_create_mapping(dev, &page, size);
1338 if (*handle == DMA_ERROR_CODE)
1339 goto err_mapping;
1340
1341 return addr;
1342
1343err_mapping:
1344 __free_from_pool(addr, size);
1345 return NULL;
1346}
1347
Marek Szyprowskid5898292013-02-08 10:54:48 +01001348static void __iommu_free_atomic(struct device *dev, void *cpu_addr,
Hiroshi Doyu479ed932012-08-28 08:13:04 +03001349 dma_addr_t handle, size_t size)
1350{
1351 __iommu_remove_mapping(dev, handle, size);
Marek Szyprowskid5898292013-02-08 10:54:48 +01001352 __free_from_pool(cpu_addr, size);
Hiroshi Doyu479ed932012-08-28 08:13:04 +03001353}
1354
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001355static void *arm_iommu_alloc_attrs(struct device *dev, size_t size,
1356 dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs)
1357{
Russell King71b55662013-11-25 12:01:03 +00001358 pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001359 struct page **pages;
1360 void *addr = NULL;
1361
1362 *handle = DMA_ERROR_CODE;
1363 size = PAGE_ALIGN(size);
1364
Mel Gormand0164ad2015-11-06 16:28:21 -08001365 if (!gfpflags_allow_blocking(gfp))
Hiroshi Doyu479ed932012-08-28 08:13:04 +03001366 return __iommu_alloc_atomic(dev, size, handle);
1367
Richard Zhao5b91a982013-06-20 20:31:00 +08001368 /*
1369 * Following is a work-around (a.k.a. hack) to prevent pages
1370 * with __GFP_COMP being passed to split_page() which cannot
1371 * handle them. The real problem is that this flag probably
1372 * should be 0 on ARM as it is not supported on this
1373 * platform; see CONFIG_HUGETLBFS.
1374 */
1375 gfp &= ~(__GFP_COMP);
1376
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001377 pages = __iommu_alloc_buffer(dev, size, gfp, attrs);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001378 if (!pages)
1379 return NULL;
1380
1381 *handle = __iommu_create_mapping(dev, pages, size);
1382 if (*handle == DMA_ERROR_CODE)
1383 goto err_buffer;
1384
Marek Szyprowski955c7572012-05-16 19:38:58 +01001385 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs))
1386 return pages;
1387
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001388 addr = __iommu_alloc_remap(pages, size, gfp, prot,
1389 __builtin_return_address(0));
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001390 if (!addr)
1391 goto err_mapping;
1392
1393 return addr;
1394
1395err_mapping:
1396 __iommu_remove_mapping(dev, *handle, size);
1397err_buffer:
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001398 __iommu_free_buffer(dev, pages, size, attrs);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001399 return NULL;
1400}
1401
1402static int arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
1403 void *cpu_addr, dma_addr_t dma_addr, size_t size,
1404 struct dma_attrs *attrs)
1405{
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001406 unsigned long uaddr = vma->vm_start;
1407 unsigned long usize = vma->vm_end - vma->vm_start;
Marek Szyprowski955c7572012-05-16 19:38:58 +01001408 struct page **pages = __iommu_get_pages(cpu_addr, attrs);
Marek Szyprowski371f0f02015-08-28 09:41:39 +01001409 unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
1410 unsigned long off = vma->vm_pgoff;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001411
1412 vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001413
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001414 if (!pages)
1415 return -ENXIO;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001416
Marek Szyprowski371f0f02015-08-28 09:41:39 +01001417 if (off >= nr_pages || (usize >> PAGE_SHIFT) > nr_pages - off)
1418 return -ENXIO;
1419
Marek Szyprowski7e312102015-08-28 09:42:09 +01001420 pages += off;
1421
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001422 do {
1423 int ret = vm_insert_page(vma, uaddr, *pages++);
1424 if (ret) {
1425 pr_err("Remapping memory failed: %d\n", ret);
1426 return ret;
1427 }
1428 uaddr += PAGE_SIZE;
1429 usize -= PAGE_SIZE;
1430 } while (usize > 0);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001431
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001432 return 0;
1433}
1434
1435/*
1436 * free a page as defined by the above mapping.
1437 * Must not be called with IRQs disabled.
1438 */
1439void arm_iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr,
1440 dma_addr_t handle, struct dma_attrs *attrs)
1441{
YoungJun Cho836bfa02013-06-17 13:18:52 +09001442 struct page **pages;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001443 size = PAGE_ALIGN(size);
1444
Hiroshi Doyu479ed932012-08-28 08:13:04 +03001445 if (__in_atomic_pool(cpu_addr, size)) {
Marek Szyprowskid5898292013-02-08 10:54:48 +01001446 __iommu_free_atomic(dev, cpu_addr, handle, size);
Hiroshi Doyu479ed932012-08-28 08:13:04 +03001447 return;
1448 }
1449
YoungJun Cho836bfa02013-06-17 13:18:52 +09001450 pages = __iommu_get_pages(cpu_addr, attrs);
1451 if (!pages) {
1452 WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr);
1453 return;
1454 }
1455
Marek Szyprowski955c7572012-05-16 19:38:58 +01001456 if (!dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) {
Laura Abbott513510d2014-10-09 15:26:40 -07001457 dma_common_free_remap(cpu_addr, size,
1458 VM_ARM_DMA_CONSISTENT | VM_USERMAP);
Marek Szyprowski955c7572012-05-16 19:38:58 +01001459 }
Marek Szyprowskie9da6e92012-07-30 09:11:33 +02001460
1461 __iommu_remove_mapping(dev, handle, size);
Marek Szyprowski549a17e2012-10-15 16:03:52 +02001462 __iommu_free_buffer(dev, pages, size, attrs);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001463}
1464
Marek Szyprowskidc2832e2012-06-13 10:01:15 +02001465static int arm_iommu_get_sgtable(struct device *dev, struct sg_table *sgt,
1466 void *cpu_addr, dma_addr_t dma_addr,
1467 size_t size, struct dma_attrs *attrs)
1468{
1469 unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
1470 struct page **pages = __iommu_get_pages(cpu_addr, attrs);
1471
1472 if (!pages)
1473 return -ENXIO;
1474
1475 return sg_alloc_table_from_pages(sgt, pages, count, 0, size,
1476 GFP_KERNEL);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001477}
1478
Andreas Herrmannc9b24992013-09-27 00:36:15 +02001479static int __dma_direction_to_prot(enum dma_data_direction dir)
1480{
1481 int prot;
1482
1483 switch (dir) {
1484 case DMA_BIDIRECTIONAL:
1485 prot = IOMMU_READ | IOMMU_WRITE;
1486 break;
1487 case DMA_TO_DEVICE:
1488 prot = IOMMU_READ;
1489 break;
1490 case DMA_FROM_DEVICE:
1491 prot = IOMMU_WRITE;
1492 break;
1493 default:
1494 prot = 0;
1495 }
1496
1497 return prot;
1498}
1499
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001500/*
1501 * Map a part of the scatter-gather list into contiguous io address space
1502 */
1503static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
1504 size_t size, dma_addr_t *handle,
Rob Herring0fa478d2012-08-21 12:23:23 +02001505 enum dma_data_direction dir, struct dma_attrs *attrs,
1506 bool is_coherent)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001507{
Will Deacon89cfdb12015-01-16 18:02:15 +01001508 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001509 dma_addr_t iova, iova_base;
1510 int ret = 0;
1511 unsigned int count;
1512 struct scatterlist *s;
Andreas Herrmannc9b24992013-09-27 00:36:15 +02001513 int prot;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001514
1515 size = PAGE_ALIGN(size);
1516 *handle = DMA_ERROR_CODE;
1517
1518 iova_base = iova = __alloc_iova(mapping, size);
1519 if (iova == DMA_ERROR_CODE)
1520 return -ENOMEM;
1521
1522 for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) {
Dan Williams3e6110f2015-12-15 12:54:06 -08001523 phys_addr_t phys = page_to_phys(sg_page(s));
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001524 unsigned int len = PAGE_ALIGN(s->offset + s->length);
1525
Rob Herring0fa478d2012-08-21 12:23:23 +02001526 if (!is_coherent &&
1527 !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001528 __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir);
1529
Andreas Herrmannc9b24992013-09-27 00:36:15 +02001530 prot = __dma_direction_to_prot(dir);
1531
1532 ret = iommu_map(mapping->domain, iova, phys, len, prot);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001533 if (ret < 0)
1534 goto fail;
1535 count += len >> PAGE_SHIFT;
1536 iova += len;
1537 }
1538 *handle = iova_base;
1539
1540 return 0;
1541fail:
1542 iommu_unmap(mapping->domain, iova_base, count * PAGE_SIZE);
1543 __free_iova(mapping, iova_base, size);
1544 return ret;
1545}
1546
Rob Herring0fa478d2012-08-21 12:23:23 +02001547static int __iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents,
1548 enum dma_data_direction dir, struct dma_attrs *attrs,
1549 bool is_coherent)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001550{
1551 struct scatterlist *s = sg, *dma = sg, *start = sg;
1552 int i, count = 0;
1553 unsigned int offset = s->offset;
1554 unsigned int size = s->offset + s->length;
1555 unsigned int max = dma_get_max_seg_size(dev);
1556
1557 for (i = 1; i < nents; i++) {
1558 s = sg_next(s);
1559
1560 s->dma_address = DMA_ERROR_CODE;
1561 s->dma_length = 0;
1562
1563 if (s->offset || (size & ~PAGE_MASK) || size + s->length > max) {
1564 if (__map_sg_chunk(dev, start, size, &dma->dma_address,
Rob Herring0fa478d2012-08-21 12:23:23 +02001565 dir, attrs, is_coherent) < 0)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001566 goto bad_mapping;
1567
1568 dma->dma_address += offset;
1569 dma->dma_length = size - offset;
1570
1571 size = offset = s->offset;
1572 start = s;
1573 dma = sg_next(dma);
1574 count += 1;
1575 }
1576 size += s->length;
1577 }
Rob Herring0fa478d2012-08-21 12:23:23 +02001578 if (__map_sg_chunk(dev, start, size, &dma->dma_address, dir, attrs,
1579 is_coherent) < 0)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001580 goto bad_mapping;
1581
1582 dma->dma_address += offset;
1583 dma->dma_length = size - offset;
1584
1585 return count+1;
1586
1587bad_mapping:
1588 for_each_sg(sg, s, count, i)
1589 __iommu_remove_mapping(dev, sg_dma_address(s), sg_dma_len(s));
1590 return 0;
1591}
1592
1593/**
Rob Herring0fa478d2012-08-21 12:23:23 +02001594 * arm_coherent_iommu_map_sg - map a set of SG buffers for streaming mode DMA
1595 * @dev: valid struct device pointer
1596 * @sg: list of buffers
1597 * @nents: number of buffers to map
1598 * @dir: DMA transfer direction
1599 *
1600 * Map a set of i/o coherent buffers described by scatterlist in streaming
1601 * mode for DMA. The scatter gather list elements are merged together (if
1602 * possible) and tagged with the appropriate dma address and length. They are
1603 * obtained via sg_dma_{address,length}.
1604 */
1605int arm_coherent_iommu_map_sg(struct device *dev, struct scatterlist *sg,
1606 int nents, enum dma_data_direction dir, struct dma_attrs *attrs)
1607{
1608 return __iommu_map_sg(dev, sg, nents, dir, attrs, true);
1609}
1610
1611/**
1612 * arm_iommu_map_sg - map a set of SG buffers for streaming mode DMA
1613 * @dev: valid struct device pointer
1614 * @sg: list of buffers
1615 * @nents: number of buffers to map
1616 * @dir: DMA transfer direction
1617 *
1618 * Map a set of buffers described by scatterlist in streaming mode for DMA.
1619 * The scatter gather list elements are merged together (if possible) and
1620 * tagged with the appropriate dma address and length. They are obtained via
1621 * sg_dma_{address,length}.
1622 */
1623int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg,
1624 int nents, enum dma_data_direction dir, struct dma_attrs *attrs)
1625{
1626 return __iommu_map_sg(dev, sg, nents, dir, attrs, false);
1627}
1628
1629static void __iommu_unmap_sg(struct device *dev, struct scatterlist *sg,
1630 int nents, enum dma_data_direction dir, struct dma_attrs *attrs,
1631 bool is_coherent)
1632{
1633 struct scatterlist *s;
1634 int i;
1635
1636 for_each_sg(sg, s, nents, i) {
1637 if (sg_dma_len(s))
1638 __iommu_remove_mapping(dev, sg_dma_address(s),
1639 sg_dma_len(s));
1640 if (!is_coherent &&
1641 !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
1642 __dma_page_dev_to_cpu(sg_page(s), s->offset,
1643 s->length, dir);
1644 }
1645}
1646
1647/**
1648 * arm_coherent_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
1649 * @dev: valid struct device pointer
1650 * @sg: list of buffers
1651 * @nents: number of buffers to unmap (same as was passed to dma_map_sg)
1652 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
1653 *
1654 * Unmap a set of streaming mode DMA translations. Again, CPU access
1655 * rules concerning calls here are the same as for dma_unmap_single().
1656 */
1657void arm_coherent_iommu_unmap_sg(struct device *dev, struct scatterlist *sg,
1658 int nents, enum dma_data_direction dir, struct dma_attrs *attrs)
1659{
1660 __iommu_unmap_sg(dev, sg, nents, dir, attrs, true);
1661}
1662
1663/**
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001664 * arm_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
1665 * @dev: valid struct device pointer
1666 * @sg: list of buffers
1667 * @nents: number of buffers to unmap (same as was passed to dma_map_sg)
1668 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
1669 *
1670 * Unmap a set of streaming mode DMA translations. Again, CPU access
1671 * rules concerning calls here are the same as for dma_unmap_single().
1672 */
1673void arm_iommu_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
1674 enum dma_data_direction dir, struct dma_attrs *attrs)
1675{
Rob Herring0fa478d2012-08-21 12:23:23 +02001676 __iommu_unmap_sg(dev, sg, nents, dir, attrs, false);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001677}
1678
1679/**
1680 * arm_iommu_sync_sg_for_cpu
1681 * @dev: valid struct device pointer
1682 * @sg: list of buffers
1683 * @nents: number of buffers to map (returned from dma_map_sg)
1684 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
1685 */
1686void arm_iommu_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
1687 int nents, enum dma_data_direction dir)
1688{
1689 struct scatterlist *s;
1690 int i;
1691
1692 for_each_sg(sg, s, nents, i)
Rob Herring0fa478d2012-08-21 12:23:23 +02001693 __dma_page_dev_to_cpu(sg_page(s), s->offset, s->length, dir);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001694
1695}
1696
1697/**
1698 * arm_iommu_sync_sg_for_device
1699 * @dev: valid struct device pointer
1700 * @sg: list of buffers
1701 * @nents: number of buffers to map (returned from dma_map_sg)
1702 * @dir: DMA transfer direction (same as was passed to dma_map_sg)
1703 */
1704void arm_iommu_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
1705 int nents, enum dma_data_direction dir)
1706{
1707 struct scatterlist *s;
1708 int i;
1709
1710 for_each_sg(sg, s, nents, i)
Rob Herring0fa478d2012-08-21 12:23:23 +02001711 __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001712}
1713
1714
1715/**
Rob Herring0fa478d2012-08-21 12:23:23 +02001716 * arm_coherent_iommu_map_page
1717 * @dev: valid struct device pointer
1718 * @page: page that buffer resides in
1719 * @offset: offset into page for start of buffer
1720 * @size: size of buffer to map
1721 * @dir: DMA transfer direction
1722 *
1723 * Coherent IOMMU aware version of arm_dma_map_page()
1724 */
1725static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *page,
1726 unsigned long offset, size_t size, enum dma_data_direction dir,
1727 struct dma_attrs *attrs)
1728{
Will Deacon89cfdb12015-01-16 18:02:15 +01001729 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Rob Herring0fa478d2012-08-21 12:23:23 +02001730 dma_addr_t dma_addr;
Will Deacon13987d62013-06-10 19:34:39 +01001731 int ret, prot, len = PAGE_ALIGN(size + offset);
Rob Herring0fa478d2012-08-21 12:23:23 +02001732
1733 dma_addr = __alloc_iova(mapping, len);
1734 if (dma_addr == DMA_ERROR_CODE)
1735 return dma_addr;
1736
Andreas Herrmannc9b24992013-09-27 00:36:15 +02001737 prot = __dma_direction_to_prot(dir);
Will Deacon13987d62013-06-10 19:34:39 +01001738
1739 ret = iommu_map(mapping->domain, dma_addr, page_to_phys(page), len, prot);
Rob Herring0fa478d2012-08-21 12:23:23 +02001740 if (ret < 0)
1741 goto fail;
1742
1743 return dma_addr + offset;
1744fail:
1745 __free_iova(mapping, dma_addr, len);
1746 return DMA_ERROR_CODE;
1747}
1748
1749/**
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001750 * arm_iommu_map_page
1751 * @dev: valid struct device pointer
1752 * @page: page that buffer resides in
1753 * @offset: offset into page for start of buffer
1754 * @size: size of buffer to map
1755 * @dir: DMA transfer direction
1756 *
1757 * IOMMU aware version of arm_dma_map_page()
1758 */
1759static dma_addr_t arm_iommu_map_page(struct device *dev, struct page *page,
1760 unsigned long offset, size_t size, enum dma_data_direction dir,
1761 struct dma_attrs *attrs)
1762{
Rob Herring0fa478d2012-08-21 12:23:23 +02001763 if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001764 __dma_page_cpu_to_dev(page, offset, size, dir);
1765
Rob Herring0fa478d2012-08-21 12:23:23 +02001766 return arm_coherent_iommu_map_page(dev, page, offset, size, dir, attrs);
1767}
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001768
Rob Herring0fa478d2012-08-21 12:23:23 +02001769/**
1770 * arm_coherent_iommu_unmap_page
1771 * @dev: valid struct device pointer
1772 * @handle: DMA address of buffer
1773 * @size: size of buffer (same as passed to dma_map_page)
1774 * @dir: DMA transfer direction (same as passed to dma_map_page)
1775 *
1776 * Coherent IOMMU aware version of arm_dma_unmap_page()
1777 */
1778static void arm_coherent_iommu_unmap_page(struct device *dev, dma_addr_t handle,
1779 size_t size, enum dma_data_direction dir,
1780 struct dma_attrs *attrs)
1781{
Will Deacon89cfdb12015-01-16 18:02:15 +01001782 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Rob Herring0fa478d2012-08-21 12:23:23 +02001783 dma_addr_t iova = handle & PAGE_MASK;
Rob Herring0fa478d2012-08-21 12:23:23 +02001784 int offset = handle & ~PAGE_MASK;
1785 int len = PAGE_ALIGN(size + offset);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001786
Rob Herring0fa478d2012-08-21 12:23:23 +02001787 if (!iova)
1788 return;
1789
1790 iommu_unmap(mapping->domain, iova, len);
1791 __free_iova(mapping, iova, len);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001792}
1793
1794/**
1795 * arm_iommu_unmap_page
1796 * @dev: valid struct device pointer
1797 * @handle: DMA address of buffer
1798 * @size: size of buffer (same as passed to dma_map_page)
1799 * @dir: DMA transfer direction (same as passed to dma_map_page)
1800 *
1801 * IOMMU aware version of arm_dma_unmap_page()
1802 */
1803static void arm_iommu_unmap_page(struct device *dev, dma_addr_t handle,
1804 size_t size, enum dma_data_direction dir,
1805 struct dma_attrs *attrs)
1806{
Will Deacon89cfdb12015-01-16 18:02:15 +01001807 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001808 dma_addr_t iova = handle & PAGE_MASK;
1809 struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));
1810 int offset = handle & ~PAGE_MASK;
1811 int len = PAGE_ALIGN(size + offset);
1812
1813 if (!iova)
1814 return;
1815
Rob Herring0fa478d2012-08-21 12:23:23 +02001816 if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001817 __dma_page_dev_to_cpu(page, offset, size, dir);
1818
1819 iommu_unmap(mapping->domain, iova, len);
1820 __free_iova(mapping, iova, len);
1821}
1822
1823static void arm_iommu_sync_single_for_cpu(struct device *dev,
1824 dma_addr_t handle, size_t size, enum dma_data_direction dir)
1825{
Will Deacon89cfdb12015-01-16 18:02:15 +01001826 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001827 dma_addr_t iova = handle & PAGE_MASK;
1828 struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));
1829 unsigned int offset = handle & ~PAGE_MASK;
1830
1831 if (!iova)
1832 return;
1833
Rob Herring0fa478d2012-08-21 12:23:23 +02001834 __dma_page_dev_to_cpu(page, offset, size, dir);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001835}
1836
1837static void arm_iommu_sync_single_for_device(struct device *dev,
1838 dma_addr_t handle, size_t size, enum dma_data_direction dir)
1839{
Will Deacon89cfdb12015-01-16 18:02:15 +01001840 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001841 dma_addr_t iova = handle & PAGE_MASK;
1842 struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));
1843 unsigned int offset = handle & ~PAGE_MASK;
1844
1845 if (!iova)
1846 return;
1847
1848 __dma_page_cpu_to_dev(page, offset, size, dir);
1849}
1850
1851struct dma_map_ops iommu_ops = {
1852 .alloc = arm_iommu_alloc_attrs,
1853 .free = arm_iommu_free_attrs,
1854 .mmap = arm_iommu_mmap_attrs,
Marek Szyprowskidc2832e2012-06-13 10:01:15 +02001855 .get_sgtable = arm_iommu_get_sgtable,
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001856
1857 .map_page = arm_iommu_map_page,
1858 .unmap_page = arm_iommu_unmap_page,
1859 .sync_single_for_cpu = arm_iommu_sync_single_for_cpu,
1860 .sync_single_for_device = arm_iommu_sync_single_for_device,
1861
1862 .map_sg = arm_iommu_map_sg,
1863 .unmap_sg = arm_iommu_unmap_sg,
1864 .sync_sg_for_cpu = arm_iommu_sync_sg_for_cpu,
1865 .sync_sg_for_device = arm_iommu_sync_sg_for_device,
Hiroshi Doyud09e1332013-01-29 14:57:07 +02001866
1867 .set_dma_mask = arm_dma_set_mask,
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001868};
1869
Rob Herring0fa478d2012-08-21 12:23:23 +02001870struct dma_map_ops iommu_coherent_ops = {
1871 .alloc = arm_iommu_alloc_attrs,
1872 .free = arm_iommu_free_attrs,
1873 .mmap = arm_iommu_mmap_attrs,
1874 .get_sgtable = arm_iommu_get_sgtable,
1875
1876 .map_page = arm_coherent_iommu_map_page,
1877 .unmap_page = arm_coherent_iommu_unmap_page,
1878
1879 .map_sg = arm_coherent_iommu_map_sg,
1880 .unmap_sg = arm_coherent_iommu_unmap_sg,
Hiroshi Doyud09e1332013-01-29 14:57:07 +02001881
1882 .set_dma_mask = arm_dma_set_mask,
Rob Herring0fa478d2012-08-21 12:23:23 +02001883};
1884
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001885/**
1886 * arm_iommu_create_mapping
1887 * @bus: pointer to the bus holding the client device (for IOMMU calls)
1888 * @base: start address of the valid IO address space
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001889 * @size: maximum size of the valid IO address space
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001890 *
1891 * Creates a mapping structure which holds information about used/unused
1892 * IO address ranges, which is required to perform memory allocation and
1893 * mapping with IOMMU aware functions.
1894 *
1895 * The client device need to be attached to the mapping with
1896 * arm_iommu_attach_device function.
1897 */
1898struct dma_iommu_mapping *
Marek Szyprowski14245322015-04-29 11:29:19 +01001899arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001900{
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001901 unsigned int bits = size >> PAGE_SHIFT;
1902 unsigned int bitmap_size = BITS_TO_LONGS(bits) * sizeof(long);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001903 struct dma_iommu_mapping *mapping;
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001904 int extensions = 1;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001905 int err = -ENOMEM;
1906
Marek Szyprowski14245322015-04-29 11:29:19 +01001907 /* currently only 32-bit DMA address space is supported */
1908 if (size > DMA_BIT_MASK(32) + 1)
1909 return ERR_PTR(-ERANGE);
1910
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001911 if (!bitmap_size)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001912 return ERR_PTR(-EINVAL);
1913
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001914 if (bitmap_size > PAGE_SIZE) {
1915 extensions = bitmap_size / PAGE_SIZE;
1916 bitmap_size = PAGE_SIZE;
1917 }
1918
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001919 mapping = kzalloc(sizeof(struct dma_iommu_mapping), GFP_KERNEL);
1920 if (!mapping)
1921 goto err;
1922
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001923 mapping->bitmap_size = bitmap_size;
1924 mapping->bitmaps = kzalloc(extensions * sizeof(unsigned long *),
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001925 GFP_KERNEL);
1926 if (!mapping->bitmaps)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001927 goto err2;
1928
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001929 mapping->bitmaps[0] = kzalloc(bitmap_size, GFP_KERNEL);
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001930 if (!mapping->bitmaps[0])
1931 goto err3;
1932
1933 mapping->nr_bitmaps = 1;
1934 mapping->extensions = extensions;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001935 mapping->base = base;
Marek Szyprowski68efd7d2014-02-25 13:01:09 +01001936 mapping->bits = BITS_PER_BYTE * bitmap_size;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001937
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001938 spin_lock_init(&mapping->lock);
1939
1940 mapping->domain = iommu_domain_alloc(bus);
1941 if (!mapping->domain)
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001942 goto err4;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001943
1944 kref_init(&mapping->kref);
1945 return mapping;
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001946err4:
1947 kfree(mapping->bitmaps[0]);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001948err3:
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001949 kfree(mapping->bitmaps);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001950err2:
1951 kfree(mapping);
1952err:
1953 return ERR_PTR(err);
1954}
Prathyush K18177d12013-01-04 06:22:42 -05001955EXPORT_SYMBOL_GPL(arm_iommu_create_mapping);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001956
1957static void release_iommu_mapping(struct kref *kref)
1958{
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001959 int i;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001960 struct dma_iommu_mapping *mapping =
1961 container_of(kref, struct dma_iommu_mapping, kref);
1962
1963 iommu_domain_free(mapping->domain);
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001964 for (i = 0; i < mapping->nr_bitmaps; i++)
1965 kfree(mapping->bitmaps[i]);
1966 kfree(mapping->bitmaps);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001967 kfree(mapping);
1968}
1969
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001970static int extend_iommu_mapping(struct dma_iommu_mapping *mapping)
1971{
1972 int next_bitmap;
1973
Marek Szyprowski462859aa2015-07-08 13:21:55 +01001974 if (mapping->nr_bitmaps >= mapping->extensions)
Andreas Herrmann4d852ef2014-02-25 13:09:53 +01001975 return -EINVAL;
1976
1977 next_bitmap = mapping->nr_bitmaps;
1978 mapping->bitmaps[next_bitmap] = kzalloc(mapping->bitmap_size,
1979 GFP_ATOMIC);
1980 if (!mapping->bitmaps[next_bitmap])
1981 return -ENOMEM;
1982
1983 mapping->nr_bitmaps++;
1984
1985 return 0;
1986}
1987
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001988void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping)
1989{
1990 if (mapping)
1991 kref_put(&mapping->kref, release_iommu_mapping);
1992}
Prathyush K18177d12013-01-04 06:22:42 -05001993EXPORT_SYMBOL_GPL(arm_iommu_release_mapping);
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001994
Laurent Pincharteab8d652015-01-23 16:21:49 +02001995static int __arm_iommu_attach_device(struct device *dev,
1996 struct dma_iommu_mapping *mapping)
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02001997{
1998 int err;
1999
2000 err = iommu_attach_device(mapping->domain, dev);
2001 if (err)
2002 return err;
2003
2004 kref_get(&mapping->kref);
Will Deacon89cfdb12015-01-16 18:02:15 +01002005 to_dma_iommu_mapping(dev) = mapping;
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02002006
Hiroshi Doyu75c59712012-09-11 07:39:48 +02002007 pr_debug("Attached IOMMU controller to %s device.\n", dev_name(dev));
Marek Szyprowski4ce63fc2012-05-16 15:48:21 +02002008 return 0;
2009}
2010
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002011/**
Laurent Pincharteab8d652015-01-23 16:21:49 +02002012 * arm_iommu_attach_device
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002013 * @dev: valid struct device pointer
Laurent Pincharteab8d652015-01-23 16:21:49 +02002014 * @mapping: io address space mapping structure (returned from
2015 * arm_iommu_create_mapping)
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002016 *
Laurent Pincharteab8d652015-01-23 16:21:49 +02002017 * Attaches specified io address space mapping to the provided device.
2018 * This replaces the dma operations (dma_map_ops pointer) with the
2019 * IOMMU aware version.
2020 *
2021 * More than one client might be attached to the same io address space
2022 * mapping.
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002023 */
Laurent Pincharteab8d652015-01-23 16:21:49 +02002024int arm_iommu_attach_device(struct device *dev,
2025 struct dma_iommu_mapping *mapping)
2026{
2027 int err;
2028
2029 err = __arm_iommu_attach_device(dev, mapping);
2030 if (err)
2031 return err;
2032
2033 set_dma_ops(dev, &iommu_ops);
2034 return 0;
2035}
2036EXPORT_SYMBOL_GPL(arm_iommu_attach_device);
2037
2038static void __arm_iommu_detach_device(struct device *dev)
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002039{
2040 struct dma_iommu_mapping *mapping;
2041
2042 mapping = to_dma_iommu_mapping(dev);
2043 if (!mapping) {
2044 dev_warn(dev, "Not attached\n");
2045 return;
2046 }
2047
2048 iommu_detach_device(mapping->domain, dev);
2049 kref_put(&mapping->kref, release_iommu_mapping);
Will Deacon89cfdb12015-01-16 18:02:15 +01002050 to_dma_iommu_mapping(dev) = NULL;
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002051
2052 pr_debug("Detached IOMMU controller from %s device.\n", dev_name(dev));
2053}
Laurent Pincharteab8d652015-01-23 16:21:49 +02002054
2055/**
2056 * arm_iommu_detach_device
2057 * @dev: valid struct device pointer
2058 *
2059 * Detaches the provided device from a previously attached map.
2060 * This voids the dma operations (dma_map_ops pointer)
2061 */
2062void arm_iommu_detach_device(struct device *dev)
2063{
2064 __arm_iommu_detach_device(dev);
2065 set_dma_ops(dev, NULL);
2066}
Prathyush K18177d12013-01-04 06:22:42 -05002067EXPORT_SYMBOL_GPL(arm_iommu_detach_device);
Hiroshi Doyu6fe36752013-01-24 15:16:57 +02002068
Will Deacon4bb25782014-08-27 17:52:44 +01002069static struct dma_map_ops *arm_get_iommu_dma_map_ops(bool coherent)
2070{
2071 return coherent ? &iommu_coherent_ops : &iommu_ops;
2072}
2073
2074static bool arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size,
2075 struct iommu_ops *iommu)
2076{
2077 struct dma_iommu_mapping *mapping;
2078
2079 if (!iommu)
2080 return false;
2081
2082 mapping = arm_iommu_create_mapping(dev->bus, dma_base, size);
2083 if (IS_ERR(mapping)) {
2084 pr_warn("Failed to create %llu-byte IOMMU mapping for device %s\n",
2085 size, dev_name(dev));
2086 return false;
2087 }
2088
Laurent Pincharteab8d652015-01-23 16:21:49 +02002089 if (__arm_iommu_attach_device(dev, mapping)) {
Will Deacon4bb25782014-08-27 17:52:44 +01002090 pr_warn("Failed to attached device %s to IOMMU_mapping\n",
2091 dev_name(dev));
2092 arm_iommu_release_mapping(mapping);
2093 return false;
2094 }
2095
2096 return true;
2097}
2098
2099static void arm_teardown_iommu_dma_ops(struct device *dev)
2100{
Will Deacon89cfdb12015-01-16 18:02:15 +01002101 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
Will Deacon4bb25782014-08-27 17:52:44 +01002102
Will Deaconc2273a12015-01-16 18:01:43 +01002103 if (!mapping)
2104 return;
2105
Laurent Pincharteab8d652015-01-23 16:21:49 +02002106 __arm_iommu_detach_device(dev);
Will Deacon4bb25782014-08-27 17:52:44 +01002107 arm_iommu_release_mapping(mapping);
2108}
2109
2110#else
2111
2112static bool arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size,
2113 struct iommu_ops *iommu)
2114{
2115 return false;
2116}
2117
2118static void arm_teardown_iommu_dma_ops(struct device *dev) { }
2119
2120#define arm_get_iommu_dma_map_ops arm_get_dma_map_ops
2121
2122#endif /* CONFIG_ARM_DMA_USE_IOMMU */
2123
2124static struct dma_map_ops *arm_get_dma_map_ops(bool coherent)
2125{
2126 return coherent ? &arm_coherent_dma_ops : &arm_dma_ops;
2127}
2128
2129void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
2130 struct iommu_ops *iommu, bool coherent)
2131{
2132 struct dma_map_ops *dma_ops;
2133
Linus Torvalds6f51ee72014-12-16 14:53:01 -08002134 dev->archdata.dma_coherent = coherent;
Will Deacon4bb25782014-08-27 17:52:44 +01002135 if (arm_setup_iommu_dma_ops(dev, dma_base, size, iommu))
2136 dma_ops = arm_get_iommu_dma_map_ops(coherent);
2137 else
2138 dma_ops = arm_get_dma_map_ops(coherent);
2139
2140 set_dma_ops(dev, dma_ops);
2141}
2142
2143void arch_teardown_dma_ops(struct device *dev)
2144{
2145 arm_teardown_iommu_dma_ops(dev);
2146}