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1/*
2 * Copyright (C) 2013 Red Hat
3 * Author: Rob Clark <robdclark@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include "msm_drv.h"
19#include "msm_gpu.h"
20#include "msm_gem.h"
21
22/*
23 * Cmdstream submission:
24 */
25
26/* make sure these don't conflict w/ MSM_SUBMIT_BO_x */
27#define BO_VALID 0x8000
28#define BO_LOCKED 0x4000
29#define BO_PINNED 0x2000
30
31static inline void __user *to_user_ptr(u64 address)
32{
33 return (void __user *)(uintptr_t)address;
34}
35
36static struct msm_gem_submit *submit_create(struct drm_device *dev,
37 struct msm_gpu *gpu, int nr)
38{
39 struct msm_gem_submit *submit;
40 int sz = sizeof(*submit) + (nr * sizeof(submit->bos[0]));
41
42 submit = kmalloc(sz, GFP_TEMPORARY | __GFP_NOWARN | __GFP_NORETRY);
43 if (submit) {
44 submit->dev = dev;
45 submit->gpu = gpu;
46
47 /* initially, until copy_from_user() and bo lookup succeeds: */
48 submit->nr_bos = 0;
49 submit->nr_cmds = 0;
50
51 INIT_LIST_HEAD(&submit->bo_list);
52 ww_acquire_init(&submit->ticket, &reservation_ww_class);
53 }
54
55 return submit;
56}
57
58static int submit_lookup_objects(struct msm_gem_submit *submit,
59 struct drm_msm_gem_submit *args, struct drm_file *file)
60{
61 unsigned i;
62 int ret = 0;
63
64 spin_lock(&file->table_lock);
65
66 for (i = 0; i < args->nr_bos; i++) {
67 struct drm_msm_gem_submit_bo submit_bo;
68 struct drm_gem_object *obj;
69 struct msm_gem_object *msm_obj;
70 void __user *userptr =
71 to_user_ptr(args->bos + (i * sizeof(submit_bo)));
72
73 ret = copy_from_user(&submit_bo, userptr, sizeof(submit_bo));
74 if (ret) {
75 ret = -EFAULT;
76 goto out_unlock;
77 }
78
79 if (submit_bo.flags & ~MSM_SUBMIT_BO_FLAGS) {
80 DRM_ERROR("invalid flags: %x\n", submit_bo.flags);
81 ret = -EINVAL;
82 goto out_unlock;
83 }
84
85 submit->bos[i].flags = submit_bo.flags;
86 /* in validate_objects() we figure out if this is true: */
87 submit->bos[i].iova = submit_bo.presumed;
88
89 /* normally use drm_gem_object_lookup(), but for bulk lookup
90 * all under single table_lock just hit object_idr directly:
91 */
92 obj = idr_find(&file->object_idr, submit_bo.handle);
93 if (!obj) {
94 DRM_ERROR("invalid handle %u at index %u\n", submit_bo.handle, i);
95 ret = -EINVAL;
96 goto out_unlock;
97 }
98
99 msm_obj = to_msm_bo(obj);
100
101 if (!list_empty(&msm_obj->submit_entry)) {
102 DRM_ERROR("handle %u at index %u already on submit list\n",
103 submit_bo.handle, i);
104 ret = -EINVAL;
105 goto out_unlock;
106 }
107
108 drm_gem_object_reference(obj);
109
110 submit->bos[i].obj = msm_obj;
111
112 list_add_tail(&msm_obj->submit_entry, &submit->bo_list);
113 }
114
115out_unlock:
116 submit->nr_bos = i;
117 spin_unlock(&file->table_lock);
118
119 return ret;
120}
121
122static void submit_unlock_unpin_bo(struct msm_gem_submit *submit, int i)
123{
124 struct msm_gem_object *msm_obj = submit->bos[i].obj;
125
126 if (submit->bos[i].flags & BO_PINNED)
127 msm_gem_put_iova(&msm_obj->base, submit->gpu->id);
128
129 if (submit->bos[i].flags & BO_LOCKED)
130 ww_mutex_unlock(&msm_obj->resv->lock);
131
132 if (!(submit->bos[i].flags & BO_VALID))
133 submit->bos[i].iova = 0;
134
135 submit->bos[i].flags &= ~(BO_LOCKED | BO_PINNED);
136}
137
138/* This is where we make sure all the bo's are reserved and pin'd: */
139static int submit_validate_objects(struct msm_gem_submit *submit)
140{
141 int contended, slow_locked = -1, i, ret = 0;
142
143retry:
144 submit->valid = true;
145
146 for (i = 0; i < submit->nr_bos; i++) {
147 struct msm_gem_object *msm_obj = submit->bos[i].obj;
148 uint32_t iova;
149
150 if (slow_locked == i)
151 slow_locked = -1;
152
153 contended = i;
154
155 if (!(submit->bos[i].flags & BO_LOCKED)) {
156 ret = ww_mutex_lock_interruptible(&msm_obj->resv->lock,
157 &submit->ticket);
158 if (ret)
159 goto fail;
160 submit->bos[i].flags |= BO_LOCKED;
161 }
162
163
164 /* if locking succeeded, pin bo: */
165 ret = msm_gem_get_iova_locked(&msm_obj->base,
166 submit->gpu->id, &iova);
167
168 /* this would break the logic in the fail path.. there is no
169 * reason for this to happen, but just to be on the safe side
170 * let's notice if this starts happening in the future:
171 */
172 WARN_ON(ret == -EDEADLK);
173
174 if (ret)
175 goto fail;
176
177 submit->bos[i].flags |= BO_PINNED;
178
179 if (iova == submit->bos[i].iova) {
180 submit->bos[i].flags |= BO_VALID;
181 } else {
182 submit->bos[i].iova = iova;
183 submit->bos[i].flags &= ~BO_VALID;
184 submit->valid = false;
185 }
186 }
187
188 ww_acquire_done(&submit->ticket);
189
190 return 0;
191
192fail:
193 for (; i >= 0; i--)
194 submit_unlock_unpin_bo(submit, i);
195
196 if (slow_locked > 0)
197 submit_unlock_unpin_bo(submit, slow_locked);
198
199 if (ret == -EDEADLK) {
200 struct msm_gem_object *msm_obj = submit->bos[contended].obj;
201 /* we lost out in a seqno race, lock and retry.. */
202 ret = ww_mutex_lock_slow_interruptible(&msm_obj->resv->lock,
203 &submit->ticket);
204 if (!ret) {
205 submit->bos[contended].flags |= BO_LOCKED;
206 slow_locked = contended;
207 goto retry;
208 }
209 }
210
211 return ret;
212}
213
214static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
215 struct msm_gem_object **obj, uint32_t *iova, bool *valid)
216{
217 if (idx >= submit->nr_bos) {
218 DRM_ERROR("invalid buffer index: %u (out of %u)\n",
219 idx, submit->nr_bos);
220 return -EINVAL;
221 }
222
223 if (obj)
224 *obj = submit->bos[idx].obj;
225 if (iova)
226 *iova = submit->bos[idx].iova;
227 if (valid)
228 *valid = !!(submit->bos[idx].flags & BO_VALID);
229
230 return 0;
231}
232
233/* process the reloc's and patch up the cmdstream as needed: */
234static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *obj,
235 uint32_t offset, uint32_t nr_relocs, uint64_t relocs)
236{
237 uint32_t i, last_offset = 0;
238 uint32_t *ptr;
239 int ret;
240
241 if (offset % 4) {
242 DRM_ERROR("non-aligned cmdstream buffer: %u\n", offset);
243 return -EINVAL;
244 }
245
246 /* For now, just map the entire thing. Eventually we probably
247 * to do it page-by-page, w/ kmap() if not vmap()d..
248 */
249 ptr = msm_gem_vaddr_locked(&obj->base);
250
251 if (IS_ERR(ptr)) {
252 ret = PTR_ERR(ptr);
253 DBG("failed to map: %d", ret);
254 return ret;
255 }
256
257 for (i = 0; i < nr_relocs; i++) {
258 struct drm_msm_gem_submit_reloc submit_reloc;
259 void __user *userptr =
260 to_user_ptr(relocs + (i * sizeof(submit_reloc)));
261 uint32_t iova, off;
262 bool valid;
263
264 ret = copy_from_user(&submit_reloc, userptr, sizeof(submit_reloc));
265 if (ret)
266 return -EFAULT;
267
268 if (submit_reloc.submit_offset % 4) {
269 DRM_ERROR("non-aligned reloc offset: %u\n",
270 submit_reloc.submit_offset);
271 return -EINVAL;
272 }
273
274 /* offset in dwords: */
275 off = submit_reloc.submit_offset / 4;
276
277 if ((off >= (obj->base.size / 4)) ||
278 (off < last_offset)) {
279 DRM_ERROR("invalid offset %u at reloc %u\n", off, i);
280 return -EINVAL;
281 }
282
283 ret = submit_bo(submit, submit_reloc.reloc_idx, NULL, &iova, &valid);
284 if (ret)
285 return ret;
286
287 if (valid)
288 continue;
289
290 iova += submit_reloc.reloc_offset;
291
292 if (submit_reloc.shift < 0)
293 iova >>= -submit_reloc.shift;
294 else
295 iova <<= submit_reloc.shift;
296
297 ptr[off] = iova | submit_reloc.or;
298
299 last_offset = off;
300 }
301
302 return 0;
303}
304
305static void submit_cleanup(struct msm_gem_submit *submit, bool fail)
306{
307 unsigned i;
308
309 for (i = 0; i < submit->nr_bos; i++) {
310 struct msm_gem_object *msm_obj = submit->bos[i].obj;
311 submit_unlock_unpin_bo(submit, i);
312 list_del_init(&msm_obj->submit_entry);
313 drm_gem_object_unreference(&msm_obj->base);
314 }
315
316 ww_acquire_fini(&submit->ticket);
317}
318
319int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
320 struct drm_file *file)
321{
322 struct msm_drm_private *priv = dev->dev_private;
323 struct drm_msm_gem_submit *args = data;
324 struct msm_file_private *ctx = file->driver_priv;
325 struct msm_gem_submit *submit;
326 struct msm_gpu *gpu = priv->gpu;
327 unsigned i;
328 int ret;
329
330 if (!gpu)
331 return -ENXIO;
332
333 /* for now, we just have 3d pipe.. eventually this would need to
334 * be more clever to dispatch to appropriate gpu module:
335 */
336 if (args->pipe != MSM_PIPE_3D0)
337 return -EINVAL;
338
339 if (args->nr_cmds > MAX_CMDS)
340 return -EINVAL;
341
342 submit = submit_create(dev, gpu, args->nr_bos);
343 if (!submit)
344 return -ENOMEM;
345
346 mutex_lock(&dev->struct_mutex);
347
348 ret = submit_lookup_objects(submit, args, file);
349 if (ret)
350 goto out;
351
352 ret = submit_validate_objects(submit);
353 if (ret)
354 goto out;
355
356 for (i = 0; i < args->nr_cmds; i++) {
357 struct drm_msm_gem_submit_cmd submit_cmd;
358 void __user *userptr =
359 to_user_ptr(args->cmds + (i * sizeof(submit_cmd)));
360 struct msm_gem_object *msm_obj;
361 uint32_t iova;
362
363 ret = copy_from_user(&submit_cmd, userptr, sizeof(submit_cmd));
364 if (ret) {
365 ret = -EFAULT;
366 goto out;
367 }
368
369 /* validate input from userspace: */
370 switch (submit_cmd.type) {
371 case MSM_SUBMIT_CMD_BUF:
372 case MSM_SUBMIT_CMD_IB_TARGET_BUF:
373 case MSM_SUBMIT_CMD_CTX_RESTORE_BUF:
374 break;
375 default:
376 DRM_ERROR("invalid type: %08x\n", submit_cmd.type);
377 ret = -EINVAL;
378 goto out;
379 }
380
381 ret = submit_bo(submit, submit_cmd.submit_idx,
382 &msm_obj, &iova, NULL);
383 if (ret)
384 goto out;
385
386 if (submit_cmd.size % 4) {
387 DRM_ERROR("non-aligned cmdstream buffer size: %u\n",
388 submit_cmd.size);
389 ret = -EINVAL;
390 goto out;
391 }
392
393 if ((submit_cmd.size + submit_cmd.submit_offset) >=
394 msm_obj->base.size) {
395 DRM_ERROR("invalid cmdstream size: %u\n", submit_cmd.size);
396 ret = -EINVAL;
397 goto out;
398 }
399
400 submit->cmd[i].type = submit_cmd.type;
401 submit->cmd[i].size = submit_cmd.size / 4;
402 submit->cmd[i].iova = iova + submit_cmd.submit_offset;
403 submit->cmd[i].idx = submit_cmd.submit_idx;
404
405 if (submit->valid)
406 continue;
407
408 ret = submit_reloc(submit, msm_obj, submit_cmd.submit_offset,
409 submit_cmd.nr_relocs, submit_cmd.relocs);
410 if (ret)
411 goto out;
412 }
413
414 submit->nr_cmds = i;
415
416 ret = msm_gpu_submit(gpu, submit, ctx);
417
418 args->fence = submit->fence;
419
420out:
421 submit_cleanup(submit, !!ret);
422 mutex_unlock(&dev->struct_mutex);
423 return ret;
424}