1 /**************************************************************************
3 * Copyright (c) 2006-2009 Vmware, Inc., Palo Alto, CA., USA
6 * Permission is hereby granted, free of charge, to any person obtaining a
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26 **************************************************************************/
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
30 #ifndef _TTM_BO_DRIVER_H_
31 #define _TTM_BO_DRIVER_H_
33 #include <drm/drm_mm.h>
34 #include <drm/drm_vma_manager.h>
35 #include <linux/workqueue.h>
37 #include <linux/spinlock.h>
38 #include <linux/dma-resv.h>
40 #include "ttm_bo_api.h"
41 #include "ttm_memory.h"
42 #include "ttm_placement.h"
47 * struct ttm_bo_driver
49 * @create_ttm_backend_entry: Callback to create a struct ttm_backend.
50 * @evict_flags: Callback to obtain placement flags when a buffer is evicted.
51 * @move: Callback for a driver to hook in accelerated functions to
53 * If set to NULL, a potentially slow memcpy() move is used.
56 struct ttm_bo_driver {
60 * @bo: The buffer object to create the ttm for.
61 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
63 * Create a struct ttm_tt to back data with system memory pages.
64 * No pages are actually allocated.
66 * NULL: Out of memory.
68 struct ttm_tt *(*ttm_tt_create)(struct ttm_buffer_object *bo,
74 * @ttm: The struct ttm_tt to contain the backing pages.
76 * Allocate all backing pages
78 * -ENOMEM: Out of memory.
80 int (*ttm_tt_populate)(struct ttm_bo_device *bdev,
82 struct ttm_operation_ctx *ctx);
87 * @ttm: The struct ttm_tt to contain the backing pages.
89 * Free all backing page
91 void (*ttm_tt_unpopulate)(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
96 * @bdev: Pointer to a ttm device
97 * @ttm: Pointer to a struct ttm_tt.
99 * Destroy the backend. This will be call back from ttm_tt_destroy so
100 * don't call ttm_tt_destroy from the callback or infinite loop.
102 void (*ttm_tt_destroy)(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
105 * struct ttm_bo_driver member eviction_valuable
107 * @bo: the buffer object to be evicted
108 * @place: placement we need room for
110 * Check with the driver if it is valuable to evict a BO to make room
111 * for a certain placement.
113 bool (*eviction_valuable)(struct ttm_buffer_object *bo,
114 const struct ttm_place *place);
116 * struct ttm_bo_driver member evict_flags:
118 * @bo: the buffer object to be evicted
120 * Return the bo flags for a buffer which is not mapped to the hardware.
121 * These will be placed in proposed_flags so that when the move is
122 * finished, they'll end up in bo->mem.flags
123 * This should not cause multihop evictions, and the core will warn
124 * if one is proposed.
127 void (*evict_flags)(struct ttm_buffer_object *bo,
128 struct ttm_placement *placement);
131 * struct ttm_bo_driver member move:
133 * @bo: the buffer to move
134 * @evict: whether this motion is evicting the buffer from
135 * the graphics address space
136 * @ctx: context for this move with parameters
137 * @new_mem: the new memory region receiving the buffer
138 @ @hop: placement for driver directed intermediate hop
140 * Move a buffer between two memory regions.
141 * Returns errno -EMULTIHOP if driver requests a hop
143 int (*move)(struct ttm_buffer_object *bo, bool evict,
144 struct ttm_operation_ctx *ctx,
145 struct ttm_resource *new_mem,
146 struct ttm_place *hop);
149 * struct ttm_bo_driver_member verify_access
151 * @bo: Pointer to a buffer object.
152 * @filp: Pointer to a struct file trying to access the object.
154 * Called from the map / write / read methods to verify that the
155 * caller is permitted to access the buffer object.
156 * This member may be set to NULL, which will refuse this kind of
157 * access for all buffer objects.
158 * This function should return 0 if access is granted, -EPERM otherwise.
160 int (*verify_access)(struct ttm_buffer_object *bo,
164 * Hook to notify driver about a resource delete.
166 void (*delete_mem_notify)(struct ttm_buffer_object *bo);
169 * notify the driver that we're about to swap out this bo
171 void (*swap_notify)(struct ttm_buffer_object *bo);
174 * Driver callback on when mapping io memory (for bo_move_memcpy
175 * for instance). TTM will take care to call io_mem_free whenever
176 * the mapping is not use anymore. io_mem_reserve & io_mem_free
179 int (*io_mem_reserve)(struct ttm_bo_device *bdev,
180 struct ttm_resource *mem);
181 void (*io_mem_free)(struct ttm_bo_device *bdev,
182 struct ttm_resource *mem);
185 * Return the pfn for a given page_offset inside the BO.
187 * @bo: the BO to look up the pfn for
188 * @page_offset: the offset to look up
190 unsigned long (*io_mem_pfn)(struct ttm_buffer_object *bo,
191 unsigned long page_offset);
194 * Read/write memory buffers for ptrace access
196 * @bo: the BO to access
197 * @offset: the offset from the start of the BO
198 * @buf: pointer to source/destination buffer
199 * @len: number of bytes to copy
200 * @write: whether to read (0) from or write (non-0) to BO
202 * If successful, this function should return the number of
203 * bytes copied, -EIO otherwise. If the number of bytes
204 * returned is < len, the function may be called again with
205 * the remainder of the buffer to copy.
207 int (*access_memory)(struct ttm_buffer_object *bo, unsigned long offset,
208 void *buf, int len, int write);
211 * struct ttm_bo_driver member del_from_lru_notify
213 * @bo: the buffer object deleted from lru
215 * notify driver that a BO was deleted from LRU.
217 void (*del_from_lru_notify)(struct ttm_buffer_object *bo);
220 * Notify the driver that we're about to release a BO
222 * @bo: BO that is about to be released
224 * Gives the driver a chance to do any cleanup, including
225 * adding fences that may force a delayed delete
227 void (*release_notify)(struct ttm_buffer_object *bo);
231 * struct ttm_bo_global - Buffer object driver global data.
233 * @dummy_read_page: Pointer to a dummy page used for mapping requests
234 * of unpopulated pages.
235 * @shrink: A shrink callback object used for buffer object swap.
236 * @device_list_mutex: Mutex protecting the device list.
237 * This mutex is held while traversing the device list for pm options.
238 * @lru_lock: Spinlock protecting the bo subsystem lru lists.
239 * @device_list: List of buffer object devices.
240 * @swap_lru: Lru list of buffer objects used for swapping.
243 extern struct ttm_bo_global {
246 * Constant after init.
250 struct page *dummy_read_page;
254 * Protected by ttm_global_mutex.
256 struct list_head device_list;
259 * Protected by the lru_lock.
261 struct list_head swap_lru[TTM_MAX_BO_PRIORITY];
264 * Internal protection.
270 #define TTM_NUM_MEM_TYPES 8
273 * struct ttm_bo_device - Buffer object driver device-specific data.
275 * @driver: Pointer to a struct ttm_bo_driver struct setup by the driver.
276 * @man: An array of resource_managers.
277 * @vma_manager: Address space manager (pointer)
278 * lru_lock: Spinlock that protects the buffer+device lru lists and
280 * @dev_mapping: A pointer to the struct address_space representing the
281 * device address space.
282 * @wq: Work queue structure for the delayed delete workqueue.
286 struct ttm_bo_device {
289 * Constant after bo device init / atomic.
291 struct list_head device_list;
292 struct ttm_bo_driver *driver;
294 * access via ttm_manager_type.
296 struct ttm_resource_manager sysman;
297 struct ttm_resource_manager *man_drv[TTM_NUM_MEM_TYPES];
299 * Protected by internal locks.
301 struct drm_vma_offset_manager *vma_manager;
302 struct ttm_pool pool;
305 * Protected by the global:lru lock.
307 struct list_head ddestroy;
310 * Protected by load / firstopen / lastclose /unload sync.
313 struct address_space *dev_mapping;
316 * Internal protection.
319 struct delayed_work wq;
322 static inline struct ttm_resource_manager *ttm_manager_type(struct ttm_bo_device *bdev,
325 return bdev->man_drv[mem_type];
328 static inline void ttm_set_driver_manager(struct ttm_bo_device *bdev,
330 struct ttm_resource_manager *manager)
332 bdev->man_drv[type] = manager;
336 * struct ttm_lru_bulk_move_pos
338 * @first: first BO in the bulk move range
339 * @last: last BO in the bulk move range
341 * Positions for a lru bulk move.
343 struct ttm_lru_bulk_move_pos {
344 struct ttm_buffer_object *first;
345 struct ttm_buffer_object *last;
349 * struct ttm_lru_bulk_move
351 * @tt: first/last lru entry for BOs in the TT domain
352 * @vram: first/last lru entry for BOs in the VRAM domain
353 * @swap: first/last lru entry for BOs on the swap list
355 * Helper structure for bulk moves on the LRU list.
357 struct ttm_lru_bulk_move {
358 struct ttm_lru_bulk_move_pos tt[TTM_MAX_BO_PRIORITY];
359 struct ttm_lru_bulk_move_pos vram[TTM_MAX_BO_PRIORITY];
360 struct ttm_lru_bulk_move_pos swap[TTM_MAX_BO_PRIORITY];
370 * @bo: Pointer to a struct ttm_buffer_object. the data of which
371 * we want to allocate space for.
372 * @proposed_placement: Proposed new placement for the buffer object.
373 * @mem: A struct ttm_resource.
374 * @interruptible: Sleep interruptible when sliping.
375 * @no_wait_gpu: Return immediately if the GPU is busy.
377 * Allocate memory space for the buffer object pointed to by @bo, using
378 * the placement flags in @mem, potentially evicting other idle buffer objects.
379 * This function may sleep while waiting for space to become available.
381 * -EBUSY: No space available (only if no_wait == 1).
382 * -ENOMEM: Could not allocate memory for the buffer object, either due to
383 * fragmentation or concurrent allocators.
384 * -ERESTARTSYS: An interruptible sleep was interrupted by a signal.
386 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
387 struct ttm_placement *placement,
388 struct ttm_resource *mem,
389 struct ttm_operation_ctx *ctx);
391 int ttm_bo_device_release(struct ttm_bo_device *bdev);
396 * @bdev: A pointer to a struct ttm_bo_device to initialize.
397 * @glob: A pointer to an initialized struct ttm_bo_global.
398 * @driver: A pointer to a struct ttm_bo_driver set up by the caller.
399 * @dev: The core kernel device pointer for DMA mappings and allocations.
400 * @mapping: The address space to use for this bo.
401 * @vma_manager: A pointer to a vma manager.
402 * @use_dma_alloc: If coherent DMA allocation API should be used.
403 * @use_dma32: If we should use GFP_DMA32 for device memory allocations.
405 * Initializes a struct ttm_bo_device:
409 int ttm_bo_device_init(struct ttm_bo_device *bdev,
410 struct ttm_bo_driver *driver,
412 struct address_space *mapping,
413 struct drm_vma_offset_manager *vma_manager,
414 bool use_dma_alloc, bool use_dma32);
417 * ttm_bo_unmap_virtual
419 * @bo: tear down the virtual mappings for this BO
421 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
426 * @bo: A pointer to a struct ttm_buffer_object.
427 * @interruptible: Sleep interruptible if waiting.
428 * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
429 * @ticket: ticket used to acquire the ww_mutex.
431 * Locks a buffer object for validation. (Or prevents other processes from
432 * locking it for validation), while taking a number of measures to prevent
436 * -EDEADLK: The reservation may cause a deadlock.
437 * Release all buffer reservations, wait for @bo to become unreserved and
439 * -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
440 * a signal. Release all buffer reservations and return to user-space.
441 * -EBUSY: The function needed to sleep, but @no_wait was true
442 * -EALREADY: Bo already reserved using @ticket. This error code will only
443 * be returned if @use_ticket is set to true.
445 static inline int ttm_bo_reserve(struct ttm_buffer_object *bo,
446 bool interruptible, bool no_wait,
447 struct ww_acquire_ctx *ticket)
456 success = dma_resv_trylock(bo->base.resv);
457 return success ? 0 : -EBUSY;
461 ret = dma_resv_lock_interruptible(bo->base.resv, ticket);
463 ret = dma_resv_lock(bo->base.resv, ticket);
470 * ttm_bo_reserve_slowpath:
471 * @bo: A pointer to a struct ttm_buffer_object.
472 * @interruptible: Sleep interruptible if waiting.
473 * @sequence: Set (@bo)->sequence to this value after lock
475 * This is called after ttm_bo_reserve returns -EAGAIN and we backed off
476 * from all our other reservations. Because there are no other reservations
477 * held by us, this function cannot deadlock any more.
479 static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
481 struct ww_acquire_ctx *ticket)
484 int ret = dma_resv_lock_slow_interruptible(bo->base.resv,
490 dma_resv_lock_slow(bo->base.resv, ticket);
494 static inline void ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object *bo)
496 spin_lock(&ttm_bo_glob.lru_lock);
497 ttm_bo_move_to_lru_tail(bo, NULL);
498 spin_unlock(&ttm_bo_glob.lru_lock);
501 static inline void ttm_bo_assign_mem(struct ttm_buffer_object *bo,
502 struct ttm_resource *new_mem)
505 new_mem->mm_node = NULL;
509 * ttm_bo_move_null = assign memory for a buffer object.
510 * @bo: The bo to assign the memory to
511 * @new_mem: The memory to be assigned.
513 * Assign the memory from new_mem to the memory of the buffer object bo.
515 static inline void ttm_bo_move_null(struct ttm_buffer_object *bo,
516 struct ttm_resource *new_mem)
518 struct ttm_resource *old_mem = &bo->mem;
520 WARN_ON(old_mem->mm_node != NULL);
521 ttm_bo_assign_mem(bo, new_mem);
527 * @bo: A pointer to a struct ttm_buffer_object.
529 * Unreserve a previous reservation of @bo.
531 static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
533 ttm_bo_move_to_lru_tail_unlocked(bo);
534 dma_resv_unlock(bo->base.resv);
540 int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
541 struct ttm_resource *mem);
542 void ttm_mem_io_free(struct ttm_bo_device *bdev,
543 struct ttm_resource *mem);
548 * @bo: A pointer to a struct ttm_buffer_object.
549 * @interruptible: Sleep interruptible if waiting.
550 * @no_wait_gpu: Return immediately if the GPU is busy.
551 * @new_mem: struct ttm_resource indicating where to move.
553 * Fallback move function for a mappable buffer object in mappable memory.
554 * The function will, if successful,
555 * free any old aperture space, and set (@new_mem)->mm_node to NULL,
556 * and update the (@bo)->mem placement flags. If unsuccessful, the old
557 * data remains untouched, and it's up to the caller to free the
558 * memory space indicated by @new_mem.
563 int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
564 struct ttm_operation_ctx *ctx,
565 struct ttm_resource *new_mem);
568 * ttm_bo_move_accel_cleanup.
570 * @bo: A pointer to a struct ttm_buffer_object.
571 * @fence: A fence object that signals when moving is complete.
572 * @evict: This is an evict move. Don't return until the buffer is idle.
573 * @pipeline: evictions are to be pipelined.
574 * @new_mem: struct ttm_resource indicating where to move.
576 * Accelerated move function to be called when an accelerated move
577 * has been scheduled. The function will create a new temporary buffer object
578 * representing the old placement, and put the sync object on both buffer
579 * objects. After that the newly created buffer object is unref'd to be
580 * destroyed when the move is complete. This will help pipeline
583 int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
584 struct dma_fence *fence, bool evict,
586 struct ttm_resource *new_mem);
589 * ttm_bo_pipeline_gutting.
591 * @bo: A pointer to a struct ttm_buffer_object.
593 * Pipelined gutting a BO of its backing store.
595 int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
600 * bo: ttm buffer object
601 * res: ttm resource object
602 * @tmp: Page protection flag for a normal, cached mapping.
604 * Utility function that returns the pgprot_t that should be used for
605 * setting up a PTE with the caching model indicated by @c_state.
607 pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
613 * Bind the object tt to a memory resource.
615 int ttm_bo_tt_bind(struct ttm_buffer_object *bo, struct ttm_resource *mem);
620 void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
626 * @type: memory manager type
627 * @use_tt: if the memory manager uses tt
628 * @p_size: size of area to be managed in pages.
630 * Initialise a generic range manager for the selected memory type.
631 * The range manager is installed for this device in the type slot.
633 int ttm_range_man_init(struct ttm_bo_device *bdev,
634 unsigned type, bool use_tt,
635 unsigned long p_size);
641 * @type: memory manager type
643 * Remove the generic range manager from a slot and tear it down.
645 int ttm_range_man_fini(struct ttm_bo_device *bdev,