blob: f669cedca8bd16cf2c2642ee99ae3643202234e2 [file] [log] [blame]
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001/*
Guennadi Liakhovetski07051352008-04-22 14:42:13 -03002 * helper functions for SG DMA video4linux capture buffers
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03003 *
Magnus Damm5d6aaf52008-07-16 21:27:49 -03004 * The functions expect the hardware being able to scatter gather
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03005 * (i.e. the buffers are not linear in physical memory, but fragmented
6 * into PAGE_SIZE chunks). They also assume the driver does not need
7 * to touch the video data.
8 *
9 * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
10 *
11 * Highly based on video-buf written originally by:
12 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
13 * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
14 * (c) 2006 Ted Walther and John Sokol
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2
19 */
20
21#include <linux/init.h>
22#include <linux/module.h>
23#include <linux/moduleparam.h>
Alexey Dobriyand43c36d2009-10-07 17:09:06 +040024#include <linux/sched.h>
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030025#include <linux/slab.h>
26#include <linux/interrupt.h>
27
Guennadi Liakhovetski07051352008-04-22 14:42:13 -030028#include <linux/dma-mapping.h>
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030029#include <linux/vmalloc.h>
30#include <linux/pagemap.h>
Ralf Baechle11763602007-10-23 20:42:11 +020031#include <linux/scatterlist.h>
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030032#include <asm/page.h>
33#include <asm/pgtable.h>
34
35#include <media/videobuf-dma-sg.h>
36
37#define MAGIC_DMABUF 0x19721112
38#define MAGIC_SG_MEM 0x17890714
39
Pawel Osciak7a022642010-03-17 04:01:04 -030040#define MAGIC_CHECK(is, should) \
41 if (unlikely((is) != (should))) { \
42 printk(KERN_ERR "magic mismatch: %x (expected %x)\n", \
43 is, should); \
44 BUG(); \
45 }
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030046
Douglas Schilling Landgrafff699e62008-04-22 14:41:48 -030047static int debug;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030048module_param(debug, int, 0644);
49
Guennadi Liakhovetski07051352008-04-22 14:42:13 -030050MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030051MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
52MODULE_LICENSE("GPL");
53
Pawel Osciak7a022642010-03-17 04:01:04 -030054#define dprintk(level, fmt, arg...) \
55 if (debug >= level) \
56 printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030057
58/* --------------------------------------------------------------------- */
59
Laurent Pinchart71817722010-05-11 10:36:32 -030060/*
61 * Return a scatterlist for some page-aligned vmalloc()'ed memory
62 * block (NULL on errors). Memory for the scatterlist is allocated
63 * using kmalloc. The caller must free the memory.
64 */
65static struct scatterlist *videobuf_vmalloc_to_sg(unsigned char *virt,
66 int nr_pages)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030067{
68 struct scatterlist *sglist;
69 struct page *pg;
70 int i;
71
Joe Perches101b25b2010-11-05 00:07:39 -030072 sglist = vzalloc(nr_pages * sizeof(*sglist));
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030073 if (NULL == sglist)
74 return NULL;
Jens Axboe45711f12007-10-22 21:19:53 +020075 sg_init_table(sglist, nr_pages);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030076 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
77 pg = vmalloc_to_page(virt);
78 if (NULL == pg)
79 goto err;
80 BUG_ON(PageHighMem(pg));
Jens Axboe642f1492007-10-24 11:20:47 +020081 sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030082 }
83 return sglist;
84
Pawel Osciak7a022642010-03-17 04:01:04 -030085err:
Cohen David.A1010ed12009-05-11 11:00:20 -030086 vfree(sglist);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030087 return NULL;
88}
89
Laurent Pinchart71817722010-05-11 10:36:32 -030090/*
91 * Return a scatterlist for a an array of userpages (NULL on errors).
92 * Memory for the scatterlist is allocated using kmalloc. The caller
93 * must free the memory.
94 */
95static struct scatterlist *videobuf_pages_to_sg(struct page **pages,
Hans Verkuil2fc11532010-09-07 06:10:45 -030096 int nr_pages, int offset, size_t size)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030097{
98 struct scatterlist *sglist;
Christophe Jailleta47cacb2008-07-04 06:33:22 -030099 int i;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300100
101 if (NULL == pages[0])
102 return NULL;
Cohen David.A1010ed12009-05-11 11:00:20 -0300103 sglist = vmalloc(nr_pages * sizeof(*sglist));
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300104 if (NULL == sglist)
105 return NULL;
Jens Axboe45711f12007-10-22 21:19:53 +0200106 sg_init_table(sglist, nr_pages);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300107
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300108 if (PageHighMem(pages[0]))
109 /* DMA to highmem pages might not work */
110 goto highmem;
Newson Edouard45f239a2011-04-19 11:54:54 -0300111 sg_set_page(&sglist[0], pages[0],
112 min_t(size_t, PAGE_SIZE - offset, size), offset);
113 size -= min_t(size_t, PAGE_SIZE - offset, size);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300114 for (i = 1; i < nr_pages; i++) {
115 if (NULL == pages[i])
116 goto nopage;
117 if (PageHighMem(pages[i]))
118 goto highmem;
Mauro Carvalho Chehab1bede752010-10-07 09:31:33 -0300119 sg_set_page(&sglist[i], pages[i], min_t(size_t, PAGE_SIZE, size), 0);
120 size -= min_t(size_t, PAGE_SIZE, size);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300121 }
122 return sglist;
123
Pawel Osciak7a022642010-03-17 04:01:04 -0300124nopage:
125 dprintk(2, "sgl: oops - no page\n");
Cohen David.A1010ed12009-05-11 11:00:20 -0300126 vfree(sglist);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300127 return NULL;
128
Pawel Osciak7a022642010-03-17 04:01:04 -0300129highmem:
130 dprintk(2, "sgl: oops - highmem page\n");
Cohen David.A1010ed12009-05-11 11:00:20 -0300131 vfree(sglist);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300132 return NULL;
133}
134
135/* --------------------------------------------------------------------- */
136
Pawel Osciak7a022642010-03-17 04:01:04 -0300137struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300138{
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300139 struct videobuf_dma_sg_memory *mem = buf->priv;
140 BUG_ON(!mem);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300141
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300142 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300143
144 return &mem->dma;
145}
Pawel Osciak7a022642010-03-17 04:01:04 -0300146EXPORT_SYMBOL_GPL(videobuf_to_dma);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300147
Hans Verkuil861360a2014-12-23 09:46:27 -0300148static void videobuf_dma_init(struct videobuf_dmabuf *dma)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300149{
Pawel Osciak7a022642010-03-17 04:01:04 -0300150 memset(dma, 0, sizeof(*dma));
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300151 dma->magic = MAGIC_DMABUF;
152}
153
Maxim Levitsky99001322007-09-27 20:34:09 -0300154static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
155 int direction, unsigned long data, unsigned long size)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300156{
Pawel Osciak7a022642010-03-17 04:01:04 -0300157 unsigned long first, last;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300158 int err, rw = 0;
159
160 dma->direction = direction;
161 switch (dma->direction) {
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300162 case DMA_FROM_DEVICE:
163 rw = READ;
164 break;
165 case DMA_TO_DEVICE:
166 rw = WRITE;
167 break;
168 default:
169 BUG();
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300170 }
171
172 first = (data & PAGE_MASK) >> PAGE_SHIFT;
173 last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
Hans Verkuil2fc11532010-09-07 06:10:45 -0300174 dma->offset = data & ~PAGE_MASK;
175 dma->size = size;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300176 dma->nr_pages = last-first+1;
Pawel Osciak7a022642010-03-17 04:01:04 -0300177 dma->pages = kmalloc(dma->nr_pages * sizeof(struct page *), GFP_KERNEL);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300178 if (NULL == dma->pages)
179 return -ENOMEM;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300180
Pawel Osciak7a022642010-03-17 04:01:04 -0300181 dprintk(1, "init user [0x%lx+0x%lx => %d pages]\n",
182 data, size, dma->nr_pages);
183
184 err = get_user_pages(current, current->mm,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300185 data & PAGE_MASK, dma->nr_pages,
186 rw == READ, 1, /* force */
187 dma->pages, NULL);
Maxim Levitsky99001322007-09-27 20:34:09 -0300188
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300189 if (err != dma->nr_pages) {
190 dma->nr_pages = (err >= 0) ? err : 0;
Pawel Osciak7a022642010-03-17 04:01:04 -0300191 dprintk(1, "get_user_pages: err=%d [%d]\n", err, dma->nr_pages);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300192 return err < 0 ? err : -EINVAL;
193 }
194 return 0;
195}
196
Hans Verkuil861360a2014-12-23 09:46:27 -0300197static int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
Maxim Levitsky99001322007-09-27 20:34:09 -0300198 unsigned long data, unsigned long size)
199{
200 int ret;
Pawel Osciak7a022642010-03-17 04:01:04 -0300201
Maxim Levitsky99001322007-09-27 20:34:09 -0300202 down_read(&current->mm->mmap_sem);
203 ret = videobuf_dma_init_user_locked(dma, direction, data, size);
204 up_read(&current->mm->mmap_sem);
205
206 return ret;
207}
208
Hans Verkuil861360a2014-12-23 09:46:27 -0300209static int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300210 int nr_pages)
211{
James Harper7b4eeed2014-06-12 06:53:38 -0300212 int i;
213
Pawel Osciak7a022642010-03-17 04:01:04 -0300214 dprintk(1, "init kernel [%d pages]\n", nr_pages);
215
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300216 dma->direction = direction;
James Harper7b4eeed2014-06-12 06:53:38 -0300217 dma->vaddr_pages = kcalloc(nr_pages, sizeof(*dma->vaddr_pages),
218 GFP_KERNEL);
219 if (!dma->vaddr_pages)
220 return -ENOMEM;
221
222 dma->dma_addr = kcalloc(nr_pages, sizeof(*dma->dma_addr), GFP_KERNEL);
223 if (!dma->dma_addr) {
224 kfree(dma->vaddr_pages);
225 return -ENOMEM;
226 }
227 for (i = 0; i < nr_pages; i++) {
228 void *addr;
229
230 addr = dma_alloc_coherent(dma->dev, PAGE_SIZE,
231 &(dma->dma_addr[i]), GFP_KERNEL);
232 if (addr == NULL)
233 goto out_free_pages;
234
235 dma->vaddr_pages[i] = virt_to_page(addr);
236 }
237 dma->vaddr = vmap(dma->vaddr_pages, nr_pages, VM_MAP | VM_IOREMAP,
238 PAGE_KERNEL);
Laurent Pinchartbb6dbe72010-05-11 10:36:34 -0300239 if (NULL == dma->vaddr) {
Pawel Osciak7a022642010-03-17 04:01:04 -0300240 dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages);
James Harper7b4eeed2014-06-12 06:53:38 -0300241 goto out_free_pages;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300242 }
Pawel Osciak7a022642010-03-17 04:01:04 -0300243
244 dprintk(1, "vmalloc is at addr 0x%08lx, size=%d\n",
Laurent Pinchartbb6dbe72010-05-11 10:36:34 -0300245 (unsigned long)dma->vaddr,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300246 nr_pages << PAGE_SHIFT);
Pawel Osciak7a022642010-03-17 04:01:04 -0300247
Laurent Pinchartbb6dbe72010-05-11 10:36:34 -0300248 memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300249 dma->nr_pages = nr_pages;
Pawel Osciak7a022642010-03-17 04:01:04 -0300250
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300251 return 0;
James Harper7b4eeed2014-06-12 06:53:38 -0300252out_free_pages:
253 while (i > 0) {
Dan Carpenter23d30902014-08-05 05:11:13 -0300254 void *addr;
255
James Harper7b4eeed2014-06-12 06:53:38 -0300256 i--;
Dan Carpenter23d30902014-08-05 05:11:13 -0300257 addr = page_address(dma->vaddr_pages[i]);
258 dma_free_coherent(dma->dev, PAGE_SIZE, addr, dma->dma_addr[i]);
James Harper7b4eeed2014-06-12 06:53:38 -0300259 }
260 kfree(dma->dma_addr);
261 dma->dma_addr = NULL;
262 kfree(dma->vaddr_pages);
263 dma->vaddr_pages = NULL;
264
265 return -ENOMEM;
266
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300267}
268
Hans Verkuil861360a2014-12-23 09:46:27 -0300269static int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300270 dma_addr_t addr, int nr_pages)
271{
Pawel Osciak7a022642010-03-17 04:01:04 -0300272 dprintk(1, "init overlay [%d pages @ bus 0x%lx]\n",
273 nr_pages, (unsigned long)addr);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300274 dma->direction = direction;
Pawel Osciak7a022642010-03-17 04:01:04 -0300275
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300276 if (0 == addr)
277 return -EINVAL;
278
279 dma->bus_addr = addr;
280 dma->nr_pages = nr_pages;
Pawel Osciak7a022642010-03-17 04:01:04 -0300281
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300282 return 0;
283}
284
Hans Verkuil861360a2014-12-23 09:46:27 -0300285static int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300286{
Pawel Osciak7a022642010-03-17 04:01:04 -0300287 MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300288 BUG_ON(0 == dma->nr_pages);
289
290 if (dma->pages) {
291 dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
Hans Verkuil2fc11532010-09-07 06:10:45 -0300292 dma->offset, dma->size);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300293 }
Laurent Pinchartbb6dbe72010-05-11 10:36:34 -0300294 if (dma->vaddr) {
295 dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr,
Pawel Osciak7a022642010-03-17 04:01:04 -0300296 dma->nr_pages);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300297 }
298 if (dma->bus_addr) {
Cohen David.A1010ed12009-05-11 11:00:20 -0300299 dma->sglist = vmalloc(sizeof(*dma->sglist));
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300300 if (NULL != dma->sglist) {
Pawel Osciak7a022642010-03-17 04:01:04 -0300301 dma->sglen = 1;
302 sg_dma_address(&dma->sglist[0]) = dma->bus_addr
303 & PAGE_MASK;
304 dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
305 sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300306 }
307 }
308 if (NULL == dma->sglist) {
Pawel Osciak7a022642010-03-17 04:01:04 -0300309 dprintk(1, "scatterlist is NULL\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300310 return -ENOMEM;
311 }
312 if (!dma->bus_addr) {
Laurent Pinchart95268402010-05-11 10:36:30 -0300313 dma->sglen = dma_map_sg(dev, dma->sglist,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300314 dma->nr_pages, dma->direction);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300315 if (0 == dma->sglen) {
316 printk(KERN_WARNING
Pawel Osciak7a022642010-03-17 04:01:04 -0300317 "%s: videobuf_map_sg failed\n", __func__);
Cohen David.A1010ed12009-05-11 11:00:20 -0300318 vfree(dma->sglist);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300319 dma->sglist = NULL;
320 dma->sglen = 0;
Figo.zhang92051b22009-06-10 23:17:27 -0300321 return -ENOMEM;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300322 }
323 }
Pawel Osciak7a022642010-03-17 04:01:04 -0300324
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300325 return 0;
326}
327
Laurent Pinchart95268402010-05-11 10:36:30 -0300328int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300329{
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300330 MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
Pawel Osciak7a022642010-03-17 04:01:04 -0300331
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300332 if (!dma->sglen)
333 return 0;
334
Laurent Pinchart95268402010-05-11 10:36:30 -0300335 dma_unmap_sg(dev, dma->sglist, dma->sglen, dma->direction);
Mauro Carvalho Chehab5ddff432007-10-08 11:43:49 -0300336
Cohen David.A1010ed12009-05-11 11:00:20 -0300337 vfree(dma->sglist);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300338 dma->sglist = NULL;
339 dma->sglen = 0;
Pawel Osciak7a022642010-03-17 04:01:04 -0300340
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300341 return 0;
342}
Pawel Osciak7a022642010-03-17 04:01:04 -0300343EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300344
345int videobuf_dma_free(struct videobuf_dmabuf *dma)
346{
Pawel Osciak7a022642010-03-17 04:01:04 -0300347 int i;
348 MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300349 BUG_ON(dma->sglen);
350
351 if (dma->pages) {
Pawel Osciak7a022642010-03-17 04:01:04 -0300352 for (i = 0; i < dma->nr_pages; i++)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300353 page_cache_release(dma->pages[i]);
354 kfree(dma->pages);
355 dma->pages = NULL;
356 }
357
James Harper7b4eeed2014-06-12 06:53:38 -0300358 if (dma->dma_addr) {
359 for (i = 0; i < dma->nr_pages; i++) {
360 void *addr;
361
362 addr = page_address(dma->vaddr_pages[i]);
363 dma_free_coherent(dma->dev, PAGE_SIZE, addr,
364 dma->dma_addr[i]);
365 }
366 kfree(dma->dma_addr);
367 dma->dma_addr = NULL;
368 kfree(dma->vaddr_pages);
369 dma->vaddr_pages = NULL;
370 vunmap(dma->vaddr);
371 dma->vaddr = NULL;
372 }
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300373
Pawel Osciak7a022642010-03-17 04:01:04 -0300374 if (dma->bus_addr)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300375 dma->bus_addr = 0;
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300376 dma->direction = DMA_NONE;
Pawel Osciak7a022642010-03-17 04:01:04 -0300377
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300378 return 0;
379}
Pawel Osciak7a022642010-03-17 04:01:04 -0300380EXPORT_SYMBOL_GPL(videobuf_dma_free);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300381
382/* --------------------------------------------------------------------- */
383
Pawel Osciak7a022642010-03-17 04:01:04 -0300384static void videobuf_vm_open(struct vm_area_struct *vma)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300385{
386 struct videobuf_mapping *map = vma->vm_private_data;
387
Pawel Osciak7a022642010-03-17 04:01:04 -0300388 dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map,
389 map->count, vma->vm_start, vma->vm_end);
390
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300391 map->count++;
392}
393
Pawel Osciak7a022642010-03-17 04:01:04 -0300394static void videobuf_vm_close(struct vm_area_struct *vma)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300395{
396 struct videobuf_mapping *map = vma->vm_private_data;
397 struct videobuf_queue *q = map->q;
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300398 struct videobuf_dma_sg_memory *mem;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300399 int i;
400
Pawel Osciak7a022642010-03-17 04:01:04 -0300401 dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map,
402 map->count, vma->vm_start, vma->vm_end);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300403
Hans Verkuilcca36e22014-01-03 08:10:49 -0300404 map->count--;
405 if (0 == map->count) {
Pawel Osciak7a022642010-03-17 04:01:04 -0300406 dprintk(1, "munmap %p q=%p\n", map, q);
Hans Verkuilcca36e22014-01-03 08:10:49 -0300407 videobuf_queue_lock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300408 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
409 if (NULL == q->bufs[i])
410 continue;
Pawel Osciak7a022642010-03-17 04:01:04 -0300411 mem = q->bufs[i]->priv;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300412 if (!mem)
413 continue;
414
Pawel Osciak7a022642010-03-17 04:01:04 -0300415 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300416
Mauro Carvalho Chehab851c0c92007-09-27 18:25:44 -0300417 if (q->bufs[i]->map != map)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300418 continue;
Mauro Carvalho Chehab851c0c92007-09-27 18:25:44 -0300419 q->bufs[i]->map = NULL;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300420 q->bufs[i]->baddr = 0;
Pawel Osciak7a022642010-03-17 04:01:04 -0300421 q->ops->buf_release(q, q->bufs[i]);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300422 }
Hans Verkuilcca36e22014-01-03 08:10:49 -0300423 videobuf_queue_unlock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300424 kfree(map);
425 }
426 return;
427}
428
429/*
430 * Get a anonymous page for the mapping. Make sure we can DMA to that
431 * memory location with 32bit PCI devices (i.e. don't use highmem for
432 * now ...). Bounce buffers don't work very well for the data rates
433 * video capture has.
434 */
Pawel Osciak7a022642010-03-17 04:01:04 -0300435static int videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300436{
437 struct page *page;
438
Pawel Osciak7a022642010-03-17 04:01:04 -0300439 dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n",
440 (unsigned long)vmf->virtual_address,
441 vma->vm_start, vma->vm_end);
442
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300443 page = alloc_page(GFP_USER | __GFP_DMA32);
444 if (!page)
Nick Piggin105354a2007-12-07 17:57:38 -0300445 return VM_FAULT_OOM;
Guennadi Liakhovetskic0cd5012009-01-03 18:20:04 -0300446 clear_user_highpage(page, (unsigned long)vmf->virtual_address);
Nick Piggin105354a2007-12-07 17:57:38 -0300447 vmf->page = page;
Pawel Osciak7a022642010-03-17 04:01:04 -0300448
Nick Piggin105354a2007-12-07 17:57:38 -0300449 return 0;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300450}
451
Pawel Osciak7a022642010-03-17 04:01:04 -0300452static const struct vm_operations_struct videobuf_vm_ops = {
453 .open = videobuf_vm_open,
454 .close = videobuf_vm_close,
455 .fault = videobuf_vm_fault,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300456};
457
458/* ---------------------------------------------------------------------
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300459 * SG handlers for the generic methods
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300460 */
461
462/* Allocated area consists on 3 parts:
463 struct video_buffer
464 struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300465 struct videobuf_dma_sg_memory
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300466 */
467
Pawel Osciak33c38282010-05-11 10:36:28 -0300468static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300469{
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300470 struct videobuf_dma_sg_memory *mem;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300471 struct videobuf_buffer *vb;
472
Pawel Osciak7a022642010-03-17 04:01:04 -0300473 vb = kzalloc(size + sizeof(*mem), GFP_KERNEL);
Pawel Osciakbee527f2010-02-22 13:10:06 -0300474 if (!vb)
475 return vb;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300476
Pawel Osciak7a022642010-03-17 04:01:04 -0300477 mem = vb->priv = ((char *)vb) + size;
478 mem->magic = MAGIC_SG_MEM;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300479
480 videobuf_dma_init(&mem->dma);
481
Pawel Osciak7a022642010-03-17 04:01:04 -0300482 dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
483 __func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb),
484 mem, (long)sizeof(*mem));
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300485
486 return vb;
487}
488
Hans Verkuil037c75e2010-03-28 08:18:37 -0300489static void *__videobuf_to_vaddr(struct videobuf_buffer *buf)
Mauro Carvalho Chehab59d34482008-04-13 15:10:00 -0300490{
491 struct videobuf_dma_sg_memory *mem = buf->priv;
492 BUG_ON(!mem);
493
494 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
495
Laurent Pinchartbb6dbe72010-05-11 10:36:34 -0300496 return mem->dma.vaddr;
Mauro Carvalho Chehab59d34482008-04-13 15:10:00 -0300497}
498
Pawel Osciak7a022642010-03-17 04:01:04 -0300499static int __videobuf_iolock(struct videobuf_queue *q,
500 struct videobuf_buffer *vb,
501 struct v4l2_framebuffer *fbuf)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300502{
Pawel Osciak7a022642010-03-17 04:01:04 -0300503 int err, pages;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300504 dma_addr_t bus;
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300505 struct videobuf_dma_sg_memory *mem = vb->priv;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300506 BUG_ON(!mem);
507
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300508 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300509
James Harper7b4eeed2014-06-12 06:53:38 -0300510 if (!mem->dma.dev)
511 mem->dma.dev = q->dev;
512 else
513 WARN_ON(mem->dma.dev != q->dev);
514
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300515 switch (vb->memory) {
516 case V4L2_MEMORY_MMAP:
517 case V4L2_MEMORY_USERPTR:
518 if (0 == vb->baddr) {
519 /* no userspace addr -- kernel bounce buffer */
520 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
Pawel Osciak7a022642010-03-17 04:01:04 -0300521 err = videobuf_dma_init_kernel(&mem->dma,
522 DMA_FROM_DEVICE,
523 pages);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300524 if (0 != err)
525 return err;
Maxim Levitsky99001322007-09-27 20:34:09 -0300526 } else if (vb->memory == V4L2_MEMORY_USERPTR) {
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300527 /* dma directly to userspace */
Pawel Osciak7a022642010-03-17 04:01:04 -0300528 err = videobuf_dma_init_user(&mem->dma,
529 DMA_FROM_DEVICE,
530 vb->baddr, vb->bsize);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300531 if (0 != err)
532 return err;
Maxim Levitsky99001322007-09-27 20:34:09 -0300533 } else {
534 /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
535 buffers can only be called from videobuf_qbuf
536 we take current->mm->mmap_sem there, to prevent
537 locking inversion, so don't take it here */
538
539 err = videobuf_dma_init_user_locked(&mem->dma,
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300540 DMA_FROM_DEVICE,
Maxim Levitsky99001322007-09-27 20:34:09 -0300541 vb->baddr, vb->bsize);
542 if (0 != err)
543 return err;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300544 }
545 break;
546 case V4L2_MEMORY_OVERLAY:
547 if (NULL == fbuf)
548 return -EINVAL;
549 /* FIXME: need sanity checks for vb->boff */
550 /*
551 * Using a double cast to avoid compiler warnings when
552 * building for PAE. Compiler doesn't like direct casting
553 * of a 32 bit ptr to 64 bit integer.
554 */
555 bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
556 pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300557 err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300558 bus, pages);
559 if (0 != err)
560 return err;
561 break;
562 default:
563 BUG();
564 }
Laurent Pinchart95268402010-05-11 10:36:30 -0300565 err = videobuf_dma_map(q->dev, &mem->dma);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300566 if (0 != err)
567 return err;
568
569 return 0;
570}
571
572static int __videobuf_sync(struct videobuf_queue *q,
573 struct videobuf_buffer *buf)
574{
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300575 struct videobuf_dma_sg_memory *mem = buf->priv;
Mauro Carvalho Chehab97f81052010-05-05 16:23:09 -0300576 BUG_ON(!mem || !mem->dma.sglen);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300577
Mauro Carvalho Chehab97f81052010-05-05 16:23:09 -0300578 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
579 MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF);
580
581 dma_sync_sg_for_cpu(q->dev, mem->dma.sglist,
Arnout Vandecappellefc7f8fd2010-03-17 19:53:04 -0300582 mem->dma.sglen, mem->dma.direction);
Mauro Carvalho Chehab97f81052010-05-05 16:23:09 -0300583
584 return 0;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300585}
586
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300587static int __videobuf_mmap_mapper(struct videobuf_queue *q,
Hans Verkuil0b62b732010-03-28 09:09:05 -0300588 struct videobuf_buffer *buf,
589 struct vm_area_struct *vma)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300590{
Hans Verkuil0b62b732010-03-28 09:09:05 -0300591 struct videobuf_dma_sg_memory *mem = buf->priv;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300592 struct videobuf_mapping *map;
Mauro Carvalho Chehab474675a2010-04-25 11:23:52 -0300593 unsigned int first, last, size = 0, i;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300594 int retval;
595
596 retval = -EINVAL;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300597
Hans Verkuil0b62b732010-03-28 09:09:05 -0300598 BUG_ON(!mem);
599 MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
600
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300601 /* look for first buffer to map */
602 for (first = 0; first < VIDEO_MAX_FRAME; first++) {
Hans Verkuil0b62b732010-03-28 09:09:05 -0300603 if (buf == q->bufs[first]) {
604 size = PAGE_ALIGN(q->bufs[first]->bsize);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300605 break;
Hans Verkuil0b62b732010-03-28 09:09:05 -0300606 }
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300607 }
Hans Verkuil0b62b732010-03-28 09:09:05 -0300608
609 /* paranoia, should never happen since buf is always valid. */
Mauro Carvalho Chehab474675a2010-04-25 11:23:52 -0300610 if (!size) {
Pawel Osciak7a022642010-03-17 04:01:04 -0300611 dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n",
Hans Verkuil0b62b732010-03-28 09:09:05 -0300612 (vma->vm_pgoff << PAGE_SHIFT));
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300613 goto done;
614 }
615
Hans Verkuil0b62b732010-03-28 09:09:05 -0300616 last = first;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300617
618 /* create mapping + update buffer list */
619 retval = -ENOMEM;
Pawel Osciak7a022642010-03-17 04:01:04 -0300620 map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300621 if (NULL == map)
622 goto done;
Brandon Philipsce540932008-04-02 18:10:59 -0300623
624 size = 0;
625 for (i = first; i <= last; i++) {
626 if (NULL == q->bufs[i])
627 continue;
Mauro Carvalho Chehab851c0c92007-09-27 18:25:44 -0300628 q->bufs[i]->map = map;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300629 q->bufs[i]->baddr = vma->vm_start + size;
Tuukka Toivonen7cbefad2009-07-23 10:56:25 -0300630 size += PAGE_ALIGN(q->bufs[i]->bsize);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300631 }
Brandon Philipsce540932008-04-02 18:10:59 -0300632
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300633 map->count = 1;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300634 map->q = q;
635 vma->vm_ops = &videobuf_vm_ops;
Konstantin Khlebnikov314e51b2012-10-08 16:29:02 -0700636 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300637 vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
638 vma->vm_private_data = map;
Pawel Osciak7a022642010-03-17 04:01:04 -0300639 dprintk(1, "mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
640 map, q, vma->vm_start, vma->vm_end, vma->vm_pgoff, first, last);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300641 retval = 0;
642
Pawel Osciak7a022642010-03-17 04:01:04 -0300643done:
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300644 return retval;
645}
646
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300647static struct videobuf_qtype_ops sg_ops = {
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300648 .magic = MAGIC_QTYPE_OPS,
649
Pawel Osciak33c38282010-05-11 10:36:28 -0300650 .alloc_vb = __videobuf_alloc_vb,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300651 .iolock = __videobuf_iolock,
652 .sync = __videobuf_sync,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300653 .mmap_mapper = __videobuf_mmap_mapper,
Hans Verkuil037c75e2010-03-28 08:18:37 -0300654 .vaddr = __videobuf_to_vaddr,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300655};
656
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300657void *videobuf_sg_alloc(size_t size)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300658{
659 struct videobuf_queue q;
660
661 /* Required to make generic handler to call __videobuf_alloc */
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300662 q.int_ops = &sg_ops;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300663
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300664 q.msize = size;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300665
Pawel Osciak33c38282010-05-11 10:36:28 -0300666 return videobuf_alloc_vb(&q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300667}
Pawel Osciak7a022642010-03-17 04:01:04 -0300668EXPORT_SYMBOL_GPL(videobuf_sg_alloc);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300669
Pawel Osciak7a022642010-03-17 04:01:04 -0300670void videobuf_queue_sg_init(struct videobuf_queue *q,
Jonathan Corbet38a54f32009-11-17 19:43:41 -0300671 const struct videobuf_queue_ops *ops,
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300672 struct device *dev,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300673 spinlock_t *irqlock,
674 enum v4l2_buf_type type,
675 enum v4l2_field field,
676 unsigned int msize,
Hans Verkuil08bff032010-09-20 17:39:46 -0300677 void *priv,
678 struct mutex *ext_lock)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300679{
Mauro Carvalho Chehabd4cae5a2007-10-08 12:20:02 -0300680 videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
Hans Verkuil08bff032010-09-20 17:39:46 -0300681 priv, &sg_ops, ext_lock);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300682}
Guennadi Liakhovetski07051352008-04-22 14:42:13 -0300683EXPORT_SYMBOL_GPL(videobuf_queue_sg_init);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300684