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ast_ttm.c
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1 /*
2  * Copyright 2012 Red Hat Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the
6  * "Software"), to deal in the Software without restriction, including
7  * without limitation the rights to use, copy, modify, merge, publish,
8  * distribute, sub license, and/or sell copies of the Software, and to
9  * permit persons to whom the Software is furnished to do so, subject to
10  * the following conditions:
11  *
12  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
15  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
16  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
17  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
18  * USE OR OTHER DEALINGS IN THE SOFTWARE.
19  *
20  * The above copyright notice and this permission notice (including the
21  * next paragraph) shall be included in all copies or substantial portions
22  * of the Software.
23  *
24  */
25 /*
26  * Authors: Dave Airlie <[email protected]>
27  */
28 #include <drm/drmP.h>
29 #include "ast_drv.h"
30 #include <ttm/ttm_page_alloc.h>
31 
32 static inline struct ast_private *
33 ast_bdev(struct ttm_bo_device *bd)
34 {
35  return container_of(bd, struct ast_private, ttm.bdev);
36 }
37 
38 static int
39 ast_ttm_mem_global_init(struct drm_global_reference *ref)
40 {
41  return ttm_mem_global_init(ref->object);
42 }
43 
44 static void
45 ast_ttm_mem_global_release(struct drm_global_reference *ref)
46 {
48 }
49 
50 static int ast_ttm_global_init(struct ast_private *ast)
51 {
52  struct drm_global_reference *global_ref;
53  int r;
54 
55  global_ref = &ast->ttm.mem_global_ref;
56  global_ref->global_type = DRM_GLOBAL_TTM_MEM;
57  global_ref->size = sizeof(struct ttm_mem_global);
58  global_ref->init = &ast_ttm_mem_global_init;
59  global_ref->release = &ast_ttm_mem_global_release;
60  r = drm_global_item_ref(global_ref);
61  if (r != 0) {
62  DRM_ERROR("Failed setting up TTM memory accounting "
63  "subsystem.\n");
64  return r;
65  }
66 
67  ast->ttm.bo_global_ref.mem_glob =
68  ast->ttm.mem_global_ref.object;
69  global_ref = &ast->ttm.bo_global_ref.ref;
70  global_ref->global_type = DRM_GLOBAL_TTM_BO;
71  global_ref->size = sizeof(struct ttm_bo_global);
72  global_ref->init = &ttm_bo_global_init;
73  global_ref->release = &ttm_bo_global_release;
74  r = drm_global_item_ref(global_ref);
75  if (r != 0) {
76  DRM_ERROR("Failed setting up TTM BO subsystem.\n");
77  drm_global_item_unref(&ast->ttm.mem_global_ref);
78  return r;
79  }
80  return 0;
81 }
82 
83 void
85 {
86  if (ast->ttm.mem_global_ref.release == NULL)
87  return;
88 
89  drm_global_item_unref(&ast->ttm.bo_global_ref.ref);
90  drm_global_item_unref(&ast->ttm.mem_global_ref);
91  ast->ttm.mem_global_ref.release = NULL;
92 }
93 
94 
95 static void ast_bo_ttm_destroy(struct ttm_buffer_object *tbo)
96 {
97  struct ast_bo *bo;
98 
99  bo = container_of(tbo, struct ast_bo, bo);
100 
102  kfree(bo);
103 }
104 
106 {
107  if (bo->destroy == &ast_bo_ttm_destroy)
108  return true;
109  return false;
110 }
111 
112 static int
113 ast_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
114  struct ttm_mem_type_manager *man)
115 {
116  switch (type) {
117  case TTM_PL_SYSTEM:
121  break;
122  case TTM_PL_VRAM:
123  man->func = &ttm_bo_manager_func;
129  break;
130  default:
131  DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
132  return -EINVAL;
133  }
134  return 0;
135 }
136 
137 static void
138 ast_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
139 {
140  struct ast_bo *astbo = ast_bo(bo);
141 
142  if (!ast_ttm_bo_is_ast_bo(bo))
143  return;
144 
146  *pl = astbo->placement;
147 }
148 
149 static int ast_bo_verify_access(struct ttm_buffer_object *bo, struct file *filp)
150 {
151  return 0;
152 }
153 
154 static int ast_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
155  struct ttm_mem_reg *mem)
156 {
157  struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
158  struct ast_private *ast = ast_bdev(bdev);
159 
160  mem->bus.addr = NULL;
161  mem->bus.offset = 0;
162  mem->bus.size = mem->num_pages << PAGE_SHIFT;
163  mem->bus.base = 0;
164  mem->bus.is_iomem = false;
165  if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
166  return -EINVAL;
167  switch (mem->mem_type) {
168  case TTM_PL_SYSTEM:
169  /* system memory */
170  return 0;
171  case TTM_PL_VRAM:
172  mem->bus.offset = mem->start << PAGE_SHIFT;
173  mem->bus.base = pci_resource_start(ast->dev->pdev, 0);
174  mem->bus.is_iomem = true;
175  break;
176  default:
177  return -EINVAL;
178  break;
179  }
180  return 0;
181 }
182 
183 static void ast_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
184 {
185 }
186 
187 static int ast_bo_move(struct ttm_buffer_object *bo,
188  bool evict, bool interruptible,
189  bool no_wait_reserve, bool no_wait_gpu,
190  struct ttm_mem_reg *new_mem)
191 {
192  int r;
193  r = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, new_mem);
194  return r;
195 }
196 
197 
198 static void ast_ttm_backend_destroy(struct ttm_tt *tt)
199 {
200  ttm_tt_fini(tt);
201  kfree(tt);
202 }
203 
204 static struct ttm_backend_func ast_tt_backend_func = {
205  .destroy = &ast_ttm_backend_destroy,
206 };
207 
208 
210  unsigned long size, uint32_t page_flags,
211  struct page *dummy_read_page)
212 {
213  struct ttm_tt *tt;
214 
215  tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
216  if (tt == NULL)
217  return NULL;
218  tt->func = &ast_tt_backend_func;
219  if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
220  kfree(tt);
221  return NULL;
222  }
223  return tt;
224 }
225 
226 static int ast_ttm_tt_populate(struct ttm_tt *ttm)
227 {
228  return ttm_pool_populate(ttm);
229 }
230 
231 static void ast_ttm_tt_unpopulate(struct ttm_tt *ttm)
232 {
233  ttm_pool_unpopulate(ttm);
234 }
235 
237  .ttm_tt_create = ast_ttm_tt_create,
238  .ttm_tt_populate = ast_ttm_tt_populate,
239  .ttm_tt_unpopulate = ast_ttm_tt_unpopulate,
240  .init_mem_type = ast_bo_init_mem_type,
241  .evict_flags = ast_bo_evict_flags,
242  .move = ast_bo_move,
243  .verify_access = ast_bo_verify_access,
244  .io_mem_reserve = &ast_ttm_io_mem_reserve,
245  .io_mem_free = &ast_ttm_io_mem_free,
246 };
247 
248 int ast_mm_init(struct ast_private *ast)
249 {
250  int ret;
251  struct drm_device *dev = ast->dev;
252  struct ttm_bo_device *bdev = &ast->ttm.bdev;
253 
254  ret = ast_ttm_global_init(ast);
255  if (ret)
256  return ret;
257 
258  ret = ttm_bo_device_init(&ast->ttm.bdev,
259  ast->ttm.bo_global_ref.ref.object,
260  &ast_bo_driver, DRM_FILE_PAGE_OFFSET,
261  true);
262  if (ret) {
263  DRM_ERROR("Error initialising bo driver; %d\n", ret);
264  return ret;
265  }
266 
267  ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
268  ast->vram_size >> PAGE_SHIFT);
269  if (ret) {
270  DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
271  return ret;
272  }
273 
274  ast->fb_mtrr = drm_mtrr_add(pci_resource_start(dev->pdev, 0),
275  pci_resource_len(dev->pdev, 0),
276  DRM_MTRR_WC);
277 
278  return 0;
279 }
280 
281 void ast_mm_fini(struct ast_private *ast)
282 {
283  struct drm_device *dev = ast->dev;
284  ttm_bo_device_release(&ast->ttm.bdev);
285 
287 
288  if (ast->fb_mtrr >= 0) {
289  drm_mtrr_del(ast->fb_mtrr,
290  pci_resource_start(dev->pdev, 0),
291  pci_resource_len(dev->pdev, 0), DRM_MTRR_WC);
292  ast->fb_mtrr = -1;
293  }
294 }
295 
296 void ast_ttm_placement(struct ast_bo *bo, int domain)
297 {
298  u32 c = 0;
299  bo->placement.fpfn = 0;
300  bo->placement.lpfn = 0;
301  bo->placement.placement = bo->placements;
302  bo->placement.busy_placement = bo->placements;
303  if (domain & TTM_PL_FLAG_VRAM)
305  if (domain & TTM_PL_FLAG_SYSTEM)
307  if (!c)
309  bo->placement.num_placement = c;
310  bo->placement.num_busy_placement = c;
311 }
312 
313 int ast_bo_reserve(struct ast_bo *bo, bool no_wait)
314 {
315  int ret;
316 
317  ret = ttm_bo_reserve(&bo->bo, true, no_wait, false, 0);
318  if (ret) {
319  if (ret != -ERESTARTSYS)
320  DRM_ERROR("reserve failed %p\n", bo);
321  return ret;
322  }
323  return 0;
324 }
325 
326 void ast_bo_unreserve(struct ast_bo *bo)
327 {
328  ttm_bo_unreserve(&bo->bo);
329 }
330 
331 int ast_bo_create(struct drm_device *dev, int size, int align,
332  uint32_t flags, struct ast_bo **pastbo)
333 {
334  struct ast_private *ast = dev->dev_private;
335  struct ast_bo *astbo;
336  size_t acc_size;
337  int ret;
338 
339  astbo = kzalloc(sizeof(struct ast_bo), GFP_KERNEL);
340  if (!astbo)
341  return -ENOMEM;
342 
343  ret = drm_gem_object_init(dev, &astbo->gem, size);
344  if (ret) {
345  kfree(astbo);
346  return ret;
347  }
348 
349  astbo->gem.driver_private = NULL;
350  astbo->bo.bdev = &ast->ttm.bdev;
351 
353 
354  acc_size = ttm_bo_dma_acc_size(&ast->ttm.bdev, size,
355  sizeof(struct ast_bo));
356 
357  ret = ttm_bo_init(&ast->ttm.bdev, &astbo->bo, size,
358  ttm_bo_type_device, &astbo->placement,
359  align >> PAGE_SHIFT, 0, false, NULL, acc_size,
360  NULL, ast_bo_ttm_destroy);
361  if (ret)
362  return ret;
363 
364  *pastbo = astbo;
365  return 0;
366 }
367 
368 static inline u64 ast_bo_gpu_offset(struct ast_bo *bo)
369 {
370  return bo->bo.offset;
371 }
372 
373 int ast_bo_pin(struct ast_bo *bo, u32 pl_flag, u64 *gpu_addr)
374 {
375  int i, ret;
376 
377  if (bo->pin_count) {
378  bo->pin_count++;
379  if (gpu_addr)
380  *gpu_addr = ast_bo_gpu_offset(bo);
381  }
382 
383  ast_ttm_placement(bo, pl_flag);
384  for (i = 0; i < bo->placement.num_placement; i++)
386  ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false, false);
387  if (ret)
388  return ret;
389 
390  bo->pin_count = 1;
391  if (gpu_addr)
392  *gpu_addr = ast_bo_gpu_offset(bo);
393  return 0;
394 }
395 
396 int ast_bo_unpin(struct ast_bo *bo)
397 {
398  int i, ret;
399  if (!bo->pin_count) {
400  DRM_ERROR("unpin bad %p\n", bo);
401  return 0;
402  }
403  bo->pin_count--;
404  if (bo->pin_count)
405  return 0;
406 
407  for (i = 0; i < bo->placement.num_placement ; i++)
408  bo->placements[i] &= ~TTM_PL_FLAG_NO_EVICT;
409  ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false, false);
410  if (ret)
411  return ret;
412 
413  return 0;
414 }
415 
416 int ast_bo_push_sysram(struct ast_bo *bo)
417 {
418  int i, ret;
419  if (!bo->pin_count) {
420  DRM_ERROR("unpin bad %p\n", bo);
421  return 0;
422  }
423  bo->pin_count--;
424  if (bo->pin_count)
425  return 0;
426 
427  if (bo->kmap.virtual)
428  ttm_bo_kunmap(&bo->kmap);
429 
431  for (i = 0; i < bo->placement.num_placement ; i++)
433 
434  ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false, false);
435  if (ret) {
436  DRM_ERROR("pushing to VRAM failed\n");
437  return ret;
438  }
439  return 0;
440 }
441 
442 int ast_mmap(struct file *filp, struct vm_area_struct *vma)
443 {
444  struct drm_file *file_priv;
445  struct ast_private *ast;
446 
448  return drm_mmap(filp, vma);
449 
450  file_priv = filp->private_data;
451  ast = file_priv->minor->dev->dev_private;
452  return ttm_bo_mmap(filp, vma, &ast->ttm.bdev);
453 }