1 /**************************************************************************
2 *
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27 /*
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 */
30
31 #ifndef _TTM_BO_API_H_
32 #define _TTM_BO_API_H_
33
34 #include <drm/drm_gem.h>
35
36 #include <linux/kref.h>
37 #include <linux/list.h>
38
39 #include "ttm_device.h"
40
41 /* Default number of pre-faulted pages in the TTM fault handler */
42 #define TTM_BO_VM_NUM_PREFAULT 16
43
44 struct iosys_map;
45
46 struct ttm_global;
47 struct ttm_device;
48 struct ttm_placement;
49 struct ttm_place;
50 struct ttm_resource;
51 struct ttm_resource_manager;
52 struct ttm_tt;
53
54 /**
55 * enum ttm_bo_type
56 *
57 * @ttm_bo_type_device: These are 'normal' buffers that can
58 * be mmapped by user space. Each of these bos occupy a slot in the
59 * device address space, that can be used for normal vm operations.
60 *
61 * @ttm_bo_type_kernel: These buffers are like ttm_bo_type_device buffers,
62 * but they cannot be accessed from user-space. For kernel-only use.
63 *
64 * @ttm_bo_type_sg: Buffer made from dmabuf sg table shared with another
65 * driver.
66 */
67 enum ttm_bo_type {
68 ttm_bo_type_device,
69 ttm_bo_type_kernel,
70 ttm_bo_type_sg
71 };
72
73 /**
74 * struct ttm_buffer_object
75 *
76 * @base: drm_gem_object superclass data.
77 * @bdev: Pointer to the buffer object device structure.
78 * @type: The bo type.
79 * @page_alignment: Page alignment.
80 * @destroy: Destruction function. If NULL, kfree is used.
81 * @kref: Reference count of this buffer object. When this refcount reaches
82 * zero, the object is destroyed or put on the delayed delete list.
83 * @resource: structure describing current placement.
84 * @ttm: TTM structure holding system pages.
85 * @deleted: True if the object is only a zombie and already deleted.
86 * @bulk_move: The bulk move object.
87 * @priority: Priority for LRU, BOs with lower priority are evicted first.
88 * @pin_count: Pin count.
89 *
90 * Base class for TTM buffer object, that deals with data placement and CPU
91 * mappings. GPU mappings are really up to the driver, but for simpler GPUs
92 * the driver can usually use the placement offset @offset directly as the
93 * GPU virtual address. For drivers implementing multiple
94 * GPU memory manager contexts, the driver should manage the address space
95 * in these contexts separately and use these objects to get the correct
96 * placement and caching for these GPU maps. This makes it possible to use
97 * these objects for even quite elaborate memory management schemes.
98 * The destroy member, the API visibility of this object makes it possible
99 * to derive driver specific types.
100 */
101 struct ttm_buffer_object {
102 struct drm_gem_object base;
103
104 /*
105 * Members constant at init.
106 */
107 struct ttm_device *bdev;
108 enum ttm_bo_type type;
109 uint32_t page_alignment;
110 void (*destroy) (struct ttm_buffer_object *);
111
112 /*
113 * Members not needing protection.
114 */
115 struct kref kref;
116
117 /*
118 * Members protected by the bo::resv::reserved lock.
119 */
120 struct ttm_resource *resource;
121 struct ttm_tt *ttm;
122 bool deleted;
123 struct ttm_lru_bulk_move *bulk_move;
124 unsigned priority;
125 unsigned pin_count;
126
127 /**
128 * @delayed_delete: Work item used when we can't delete the BO
129 * immediately
130 */
131 struct work_struct delayed_delete;
132
133 /**
134 * @sg: external source of pages and DMA addresses, protected by the
135 * reservation lock.
136 */
137 struct sg_table *sg;
138 };
139
140 #define TTM_BO_MAP_IOMEM_MASK 0x80
141
142 /**
143 * struct ttm_bo_kmap_obj
144 *
145 * @virtual: The current kernel virtual address.
146 * @page: The page when kmap'ing a single page.
147 * @bo_kmap_type: Type of bo_kmap.
148 * @bo: The TTM BO.
149 *
150 * Object describing a kernel mapping. Since a TTM bo may be located
151 * in various memory types with various caching policies, the
152 * mapping can either be an ioremap, a vmap, a kmap or part of a
153 * premapped region.
154 */
155 struct ttm_bo_kmap_obj {
156 void *virtual;
157 struct page *page;
158 enum {
159 ttm_bo_map_iomap = 1 | TTM_BO_MAP_IOMEM_MASK,
160 ttm_bo_map_vmap = 2,
161 ttm_bo_map_kmap = 3,
162 ttm_bo_map_premapped = 4 | TTM_BO_MAP_IOMEM_MASK,
163 } bo_kmap_type;
164 struct ttm_buffer_object *bo;
165 };
166
167 /**
168 * struct ttm_operation_ctx
169 *
170 * @interruptible: Sleep interruptible if sleeping.
171 * @no_wait_gpu: Return immediately if the GPU is busy.
172 * @gfp_retry_mayfail: Set the __GFP_RETRY_MAYFAIL when allocation pages.
173 * @allow_res_evict: Allow eviction of reserved BOs. Can be used when multiple
174 * BOs share the same reservation object.
175 * @force_alloc: Don't check the memory account during suspend or CPU page
176 * faults. Should only be used by TTM internally.
177 * @resv: Reservation object to allow reserved evictions with.
178 * @bytes_moved: Statistics on how many bytes have been moved.
179 *
180 * Context for TTM operations like changing buffer placement or general memory
181 * allocation.
182 */
183 struct ttm_operation_ctx {
184 bool interruptible;
185 bool no_wait_gpu;
186 bool gfp_retry_mayfail;
187 bool allow_res_evict;
188 bool force_alloc;
189 struct dma_resv *resv;
190 uint64_t bytes_moved;
191 };
192
193 /**
194 * ttm_bo_get - reference a struct ttm_buffer_object
195 *
196 * @bo: The buffer object.
197 */
ttm_bo_get(struct ttm_buffer_object * bo)198 static inline void ttm_bo_get(struct ttm_buffer_object *bo)
199 {
200 kref_get(&bo->kref);
201 }
202
203 /**
204 * ttm_bo_get_unless_zero - reference a struct ttm_buffer_object unless
205 * its refcount has already reached zero.
206 * @bo: The buffer object.
207 *
208 * Used to reference a TTM buffer object in lookups where the object is removed
209 * from the lookup structure during the destructor and for RCU lookups.
210 *
211 * Returns: @bo if the referencing was successful, NULL otherwise.
212 */
213 static inline __must_check struct ttm_buffer_object *
ttm_bo_get_unless_zero(struct ttm_buffer_object * bo)214 ttm_bo_get_unless_zero(struct ttm_buffer_object *bo)
215 {
216 if (!kref_get_unless_zero(&bo->kref))
217 return NULL;
218 return bo;
219 }
220
221 /**
222 * ttm_bo_reserve:
223 *
224 * @bo: A pointer to a struct ttm_buffer_object.
225 * @interruptible: Sleep interruptible if waiting.
226 * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
227 * @ticket: ticket used to acquire the ww_mutex.
228 *
229 * Locks a buffer object for validation. (Or prevents other processes from
230 * locking it for validation), while taking a number of measures to prevent
231 * deadlocks.
232 *
233 * Returns:
234 * -EDEADLK: The reservation may cause a deadlock.
235 * Release all buffer reservations, wait for @bo to become unreserved and
236 * try again.
237 * -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
238 * a signal. Release all buffer reservations and return to user-space.
239 * -EBUSY: The function needed to sleep, but @no_wait was true
240 * -EALREADY: Bo already reserved using @ticket. This error code will only
241 * be returned if @use_ticket is set to true.
242 */
ttm_bo_reserve(struct ttm_buffer_object * bo,bool interruptible,bool no_wait,struct ww_acquire_ctx * ticket)243 static inline int ttm_bo_reserve(struct ttm_buffer_object *bo,
244 bool interruptible, bool no_wait,
245 struct ww_acquire_ctx *ticket)
246 {
247 int ret = 0;
248
249 if (no_wait) {
250 bool success;
251
252 if (WARN_ON(ticket))
253 return -EBUSY;
254
255 success = dma_resv_trylock(bo->base.resv);
256 return success ? 0 : -EBUSY;
257 }
258
259 if (interruptible)
260 ret = dma_resv_lock_interruptible(bo->base.resv, ticket);
261 else
262 ret = dma_resv_lock(bo->base.resv, ticket);
263 if (ret == -EINTR)
264 return -ERESTARTSYS;
265 return ret;
266 }
267
268 /**
269 * ttm_bo_reserve_slowpath:
270 * @bo: A pointer to a struct ttm_buffer_object.
271 * @interruptible: Sleep interruptible if waiting.
272 * @ticket: Ticket used to acquire the ww_mutex.
273 *
274 * This is called after ttm_bo_reserve returns -EAGAIN and we backed off
275 * from all our other reservations. Because there are no other reservations
276 * held by us, this function cannot deadlock any more.
277 */
ttm_bo_reserve_slowpath(struct ttm_buffer_object * bo,bool interruptible,struct ww_acquire_ctx * ticket)278 static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
279 bool interruptible,
280 struct ww_acquire_ctx *ticket)
281 {
282 if (interruptible) {
283 int ret = dma_resv_lock_slow_interruptible(bo->base.resv,
284 ticket);
285 if (ret == -EINTR)
286 ret = -ERESTARTSYS;
287 return ret;
288 }
289 dma_resv_lock_slow(bo->base.resv, ticket);
290 return 0;
291 }
292
293 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo);
294
295 static inline void
ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object * bo)296 ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object *bo)
297 {
298 spin_lock(&bo->bdev->lru_lock);
299 ttm_bo_move_to_lru_tail(bo);
300 spin_unlock(&bo->bdev->lru_lock);
301 }
302
ttm_bo_assign_mem(struct ttm_buffer_object * bo,struct ttm_resource * new_mem)303 static inline void ttm_bo_assign_mem(struct ttm_buffer_object *bo,
304 struct ttm_resource *new_mem)
305 {
306 WARN_ON(bo->resource);
307 bo->resource = new_mem;
308 }
309
310 /**
311 * ttm_bo_move_null - assign memory for a buffer object.
312 * @bo: The bo to assign the memory to
313 * @new_mem: The memory to be assigned.
314 *
315 * Assign the memory from new_mem to the memory of the buffer object bo.
316 */
ttm_bo_move_null(struct ttm_buffer_object * bo,struct ttm_resource * new_mem)317 static inline void ttm_bo_move_null(struct ttm_buffer_object *bo,
318 struct ttm_resource *new_mem)
319 {
320 ttm_resource_free(bo, &bo->resource);
321 ttm_bo_assign_mem(bo, new_mem);
322 }
323
324 /**
325 * ttm_bo_unreserve
326 *
327 * @bo: A pointer to a struct ttm_buffer_object.
328 *
329 * Unreserve a previous reservation of @bo.
330 */
ttm_bo_unreserve(struct ttm_buffer_object * bo)331 static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
332 {
333 ttm_bo_move_to_lru_tail_unlocked(bo);
334 dma_resv_unlock(bo->base.resv);
335 }
336
337 /**
338 * ttm_kmap_obj_virtual
339 *
340 * @map: A struct ttm_bo_kmap_obj returned from ttm_bo_kmap.
341 * @is_iomem: Pointer to an integer that on return indicates 1 if the
342 * virtual map is io memory, 0 if normal memory.
343 *
344 * Returns the virtual address of a buffer object area mapped by ttm_bo_kmap.
345 * If *is_iomem is 1 on return, the virtual address points to an io memory area,
346 * that should strictly be accessed by the iowriteXX() and similar functions.
347 */
ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj * map,bool * is_iomem)348 static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map,
349 bool *is_iomem)
350 {
351 *is_iomem = !!(map->bo_kmap_type & TTM_BO_MAP_IOMEM_MASK);
352 return map->virtual;
353 }
354
355 int ttm_bo_wait_ctx(struct ttm_buffer_object *bo,
356 struct ttm_operation_ctx *ctx);
357 int ttm_bo_validate(struct ttm_buffer_object *bo,
358 struct ttm_placement *placement,
359 struct ttm_operation_ctx *ctx);
360 void ttm_bo_put(struct ttm_buffer_object *bo);
361 void ttm_bo_set_bulk_move(struct ttm_buffer_object *bo,
362 struct ttm_lru_bulk_move *bulk);
363 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
364 const struct ttm_place *place);
365 int ttm_bo_init_reserved(struct ttm_device *bdev, struct ttm_buffer_object *bo,
366 enum ttm_bo_type type, struct ttm_placement *placement,
367 uint32_t alignment, struct ttm_operation_ctx *ctx,
368 struct sg_table *sg, struct dma_resv *resv,
369 void (*destroy)(struct ttm_buffer_object *));
370 int ttm_bo_init_validate(struct ttm_device *bdev, struct ttm_buffer_object *bo,
371 enum ttm_bo_type type, struct ttm_placement *placement,
372 uint32_t alignment, bool interruptible,
373 struct sg_table *sg, struct dma_resv *resv,
374 void (*destroy)(struct ttm_buffer_object *));
375 int ttm_bo_kmap(struct ttm_buffer_object *bo, unsigned long start_page,
376 unsigned long num_pages, struct ttm_bo_kmap_obj *map);
377 void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map);
378 int ttm_bo_vmap(struct ttm_buffer_object *bo, struct iosys_map *map);
379 void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct iosys_map *map);
380 int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo);
381 int ttm_bo_swapout(struct ttm_buffer_object *bo, struct ttm_operation_ctx *ctx,
382 gfp_t gfp_flags);
383 void ttm_bo_pin(struct ttm_buffer_object *bo);
384 void ttm_bo_unpin(struct ttm_buffer_object *bo);
385 int ttm_mem_evict_first(struct ttm_device *bdev,
386 struct ttm_resource_manager *man,
387 const struct ttm_place *place,
388 struct ttm_operation_ctx *ctx,
389 struct ww_acquire_ctx *ticket);
390 vm_fault_t ttm_bo_vm_reserve(struct ttm_buffer_object *bo,
391 struct vm_fault *vmf);
392 vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
393 pgprot_t prot,
394 pgoff_t num_prefault);
395 vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf);
396 void ttm_bo_vm_open(struct vm_area_struct *vma);
397 void ttm_bo_vm_close(struct vm_area_struct *vma);
398 int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
399 void *buf, int len, int write);
400 vm_fault_t ttm_bo_vm_dummy_page(struct vm_fault *vmf, pgprot_t prot);
401
402 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
403 struct ttm_placement *placement,
404 struct ttm_resource **mem,
405 struct ttm_operation_ctx *ctx);
406
407 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
408 /*
409 * ttm_bo_util.c
410 */
411 int ttm_mem_io_reserve(struct ttm_device *bdev,
412 struct ttm_resource *mem);
413 void ttm_mem_io_free(struct ttm_device *bdev,
414 struct ttm_resource *mem);
415 void ttm_move_memcpy(bool clear, u32 num_pages,
416 struct ttm_kmap_iter *dst_iter,
417 struct ttm_kmap_iter *src_iter);
418 int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
419 struct ttm_operation_ctx *ctx,
420 struct ttm_resource *new_mem);
421 int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
422 struct dma_fence *fence, bool evict,
423 bool pipeline,
424 struct ttm_resource *new_mem);
425 void ttm_bo_move_sync_cleanup(struct ttm_buffer_object *bo,
426 struct ttm_resource *new_mem);
427 int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
428 pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
429 pgprot_t tmp);
430 void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
431
432 #endif
433