diff options
Diffstat (limited to 'drivers/gpu/drm/ttm/ttm_resource.c')
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_resource.c | 945 |
1 files changed, 945 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_resource.c b/drivers/gpu/drm/ttm/ttm_resource.c new file mode 100644 index 000000000000..f5aa29dc6ec0 --- /dev/null +++ b/drivers/gpu/drm/ttm/ttm_resource.c @@ -0,0 +1,945 @@ +/* + * Copyright 2020 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Christian König + */ + +#include <linux/debugfs.h> +#include <linux/export.h> +#include <linux/io-mapping.h> +#include <linux/iosys-map.h> +#include <linux/scatterlist.h> +#include <linux/cgroup_dmem.h> + +#include <drm/ttm/ttm_bo.h> +#include <drm/ttm/ttm_placement.h> +#include <drm/ttm/ttm_resource.h> +#include <drm/ttm/ttm_tt.h> + +#include <drm/drm_print.h> +#include <drm/drm_util.h> + +/* Detach the cursor from the bulk move list*/ +static void +ttm_resource_cursor_clear_bulk(struct ttm_resource_cursor *cursor) +{ + lockdep_assert_held(&cursor->man->bdev->lru_lock); + + cursor->bulk = NULL; + list_del_init(&cursor->bulk_link); +} + +/* Move the cursor to the end of the bulk move list it's in */ +static void ttm_resource_cursor_move_bulk_tail(struct ttm_lru_bulk_move *bulk, + struct ttm_resource_cursor *cursor) +{ + struct ttm_lru_bulk_move_pos *pos; + + lockdep_assert_held(&cursor->man->bdev->lru_lock); + + if (WARN_ON_ONCE(bulk != cursor->bulk)) { + list_del_init(&cursor->bulk_link); + return; + } + + pos = &bulk->pos[cursor->mem_type][cursor->priority]; + if (pos->last) + list_move(&cursor->hitch.link, &pos->last->lru.link); + ttm_resource_cursor_clear_bulk(cursor); +} + +/* Move all cursors attached to a bulk move to its end */ +static void ttm_bulk_move_adjust_cursors(struct ttm_lru_bulk_move *bulk) +{ + struct ttm_resource_cursor *cursor, *next; + + list_for_each_entry_safe(cursor, next, &bulk->cursor_list, bulk_link) + ttm_resource_cursor_move_bulk_tail(bulk, cursor); +} + +/* Remove a cursor from an empty bulk move list */ +static void ttm_bulk_move_drop_cursors(struct ttm_lru_bulk_move *bulk) +{ + struct ttm_resource_cursor *cursor, *next; + + list_for_each_entry_safe(cursor, next, &bulk->cursor_list, bulk_link) + ttm_resource_cursor_clear_bulk(cursor); +} + +/** + * ttm_resource_cursor_init() - Initialize a struct ttm_resource_cursor + * @cursor: The cursor to initialize. + * @man: The resource manager. + * + * Initialize the cursor before using it for iteration. + */ +void ttm_resource_cursor_init(struct ttm_resource_cursor *cursor, + struct ttm_resource_manager *man) +{ + cursor->priority = 0; + cursor->man = man; + ttm_lru_item_init(&cursor->hitch, TTM_LRU_HITCH); + INIT_LIST_HEAD(&cursor->bulk_link); + INIT_LIST_HEAD(&cursor->hitch.link); +} + +/** + * ttm_resource_cursor_fini() - Finalize the LRU list cursor usage + * @cursor: The struct ttm_resource_cursor to finalize. + * + * The function pulls the LRU list cursor off any lists it was previusly + * attached to. Needs to be called with the LRU lock held. The function + * can be called multiple times after eachother. + */ +void ttm_resource_cursor_fini(struct ttm_resource_cursor *cursor) +{ + lockdep_assert_held(&cursor->man->bdev->lru_lock); + list_del_init(&cursor->hitch.link); + ttm_resource_cursor_clear_bulk(cursor); +} + +/** + * ttm_lru_bulk_move_init - initialize a bulk move structure + * @bulk: the structure to init + * + * For now just memset the structure to zero. + */ +void ttm_lru_bulk_move_init(struct ttm_lru_bulk_move *bulk) +{ + memset(bulk, 0, sizeof(*bulk)); + INIT_LIST_HEAD(&bulk->cursor_list); +} +EXPORT_SYMBOL(ttm_lru_bulk_move_init); + +/** + * ttm_lru_bulk_move_fini - finalize a bulk move structure + * @bdev: The struct ttm_device + * @bulk: the structure to finalize + * + * Sanity checks that bulk moves don't have any + * resources left and hence no cursors attached. + */ +void ttm_lru_bulk_move_fini(struct ttm_device *bdev, + struct ttm_lru_bulk_move *bulk) +{ + spin_lock(&bdev->lru_lock); + ttm_bulk_move_drop_cursors(bulk); + spin_unlock(&bdev->lru_lock); +} +EXPORT_SYMBOL(ttm_lru_bulk_move_fini); + +/** + * ttm_lru_bulk_move_tail - bulk move range of resources to the LRU tail. + * + * @bulk: bulk move structure + * + * Bulk move BOs to the LRU tail, only valid to use when driver makes sure that + * resource order never changes. Should be called with &ttm_device.lru_lock held. + */ +void ttm_lru_bulk_move_tail(struct ttm_lru_bulk_move *bulk) +{ + unsigned i, j; + + ttm_bulk_move_adjust_cursors(bulk); + for (i = 0; i < TTM_NUM_MEM_TYPES; ++i) { + for (j = 0; j < TTM_MAX_BO_PRIORITY; ++j) { + struct ttm_lru_bulk_move_pos *pos = &bulk->pos[i][j]; + struct ttm_resource_manager *man; + + if (!pos->first) + continue; + + lockdep_assert_held(&pos->first->bo->bdev->lru_lock); + dma_resv_assert_held(pos->first->bo->base.resv); + dma_resv_assert_held(pos->last->bo->base.resv); + + man = ttm_manager_type(pos->first->bo->bdev, i); + list_bulk_move_tail(&man->lru[j], &pos->first->lru.link, + &pos->last->lru.link); + } + } +} +EXPORT_SYMBOL(ttm_lru_bulk_move_tail); + +/* Return the bulk move pos object for this resource */ +static struct ttm_lru_bulk_move_pos * +ttm_lru_bulk_move_pos(struct ttm_lru_bulk_move *bulk, struct ttm_resource *res) +{ + return &bulk->pos[res->mem_type][res->bo->priority]; +} + +/* Return the previous resource on the list (skip over non-resource list items) */ +static struct ttm_resource *ttm_lru_prev_res(struct ttm_resource *cur) +{ + struct ttm_lru_item *lru = &cur->lru; + + do { + lru = list_prev_entry(lru, link); + } while (!ttm_lru_item_is_res(lru)); + + return ttm_lru_item_to_res(lru); +} + +/* Return the next resource on the list (skip over non-resource list items) */ +static struct ttm_resource *ttm_lru_next_res(struct ttm_resource *cur) +{ + struct ttm_lru_item *lru = &cur->lru; + + do { + lru = list_next_entry(lru, link); + } while (!ttm_lru_item_is_res(lru)); + + return ttm_lru_item_to_res(lru); +} + +/* Move the resource to the tail of the bulk move range */ +static void ttm_lru_bulk_move_pos_tail(struct ttm_lru_bulk_move_pos *pos, + struct ttm_resource *res) +{ + if (pos->last != res) { + if (pos->first == res) + pos->first = ttm_lru_next_res(res); + list_move(&res->lru.link, &pos->last->lru.link); + pos->last = res; + } +} + +/* Add the resource to a bulk_move cursor */ +static void ttm_lru_bulk_move_add(struct ttm_lru_bulk_move *bulk, + struct ttm_resource *res) +{ + struct ttm_lru_bulk_move_pos *pos = ttm_lru_bulk_move_pos(bulk, res); + + if (!pos->first) { + pos->first = res; + pos->last = res; + } else { + WARN_ON(pos->first->bo->base.resv != res->bo->base.resv); + ttm_lru_bulk_move_pos_tail(pos, res); + } +} + +/* Remove the resource from a bulk_move range */ +static void ttm_lru_bulk_move_del(struct ttm_lru_bulk_move *bulk, + struct ttm_resource *res) +{ + struct ttm_lru_bulk_move_pos *pos = ttm_lru_bulk_move_pos(bulk, res); + + if (unlikely(WARN_ON(!pos->first || !pos->last) || + (pos->first == res && pos->last == res))) { + pos->first = NULL; + pos->last = NULL; + } else if (pos->first == res) { + pos->first = ttm_lru_next_res(res); + } else if (pos->last == res) { + pos->last = ttm_lru_prev_res(res); + } else { + list_move(&res->lru.link, &pos->last->lru.link); + } +} + +static bool ttm_resource_is_swapped(struct ttm_resource *res, struct ttm_buffer_object *bo) +{ + /* + * Take care when creating a new resource for a bo, that it is not considered + * swapped if it's not the current resource for the bo and is thus logically + * associated with the ttm_tt. Think a VRAM resource created to move a + * swapped-out bo to VRAM. + */ + if (bo->resource != res || !bo->ttm) + return false; + + dma_resv_assert_held(bo->base.resv); + return ttm_tt_is_swapped(bo->ttm); +} + +static bool ttm_resource_unevictable(struct ttm_resource *res, struct ttm_buffer_object *bo) +{ + return bo->pin_count || ttm_resource_is_swapped(res, bo); +} + +/* Add the resource to a bulk move if the BO is configured for it */ +void ttm_resource_add_bulk_move(struct ttm_resource *res, + struct ttm_buffer_object *bo) +{ + if (bo->bulk_move && !ttm_resource_unevictable(res, bo)) + ttm_lru_bulk_move_add(bo->bulk_move, res); +} + +/* Remove the resource from a bulk move if the BO is configured for it */ +void ttm_resource_del_bulk_move(struct ttm_resource *res, + struct ttm_buffer_object *bo) +{ + if (bo->bulk_move && !ttm_resource_unevictable(res, bo)) + ttm_lru_bulk_move_del(bo->bulk_move, res); +} + +/* Move a resource to the LRU or bulk tail */ +void ttm_resource_move_to_lru_tail(struct ttm_resource *res) +{ + struct ttm_buffer_object *bo = res->bo; + struct ttm_device *bdev = bo->bdev; + + lockdep_assert_held(&bo->bdev->lru_lock); + + if (ttm_resource_unevictable(res, bo)) { + list_move_tail(&res->lru.link, &bdev->unevictable); + + } else if (bo->bulk_move) { + struct ttm_lru_bulk_move_pos *pos = + ttm_lru_bulk_move_pos(bo->bulk_move, res); + + ttm_lru_bulk_move_pos_tail(pos, res); + } else { + struct ttm_resource_manager *man; + + man = ttm_manager_type(bdev, res->mem_type); + list_move_tail(&res->lru.link, &man->lru[bo->priority]); + } +} + +/** + * ttm_resource_init - resource object constructure + * @bo: buffer object this resources is allocated for + * @place: placement of the resource + * @res: the resource object to inistilize + * + * Initialize a new resource object. Counterpart of ttm_resource_fini(). + */ +void ttm_resource_init(struct ttm_buffer_object *bo, + const struct ttm_place *place, + struct ttm_resource *res) +{ + struct ttm_resource_manager *man; + + res->start = 0; + res->size = bo->base.size; + res->mem_type = place->mem_type; + res->placement = place->flags; + res->bus.addr = NULL; + res->bus.offset = 0; + res->bus.is_iomem = false; + res->bus.caching = ttm_cached; + res->bo = bo; + + man = ttm_manager_type(bo->bdev, place->mem_type); + spin_lock(&bo->bdev->lru_lock); + if (ttm_resource_unevictable(res, bo)) + list_add_tail(&res->lru.link, &bo->bdev->unevictable); + else + list_add_tail(&res->lru.link, &man->lru[bo->priority]); + man->usage += res->size; + spin_unlock(&bo->bdev->lru_lock); +} +EXPORT_SYMBOL(ttm_resource_init); + +/** + * ttm_resource_fini - resource destructor + * @man: the resource manager this resource belongs to + * @res: the resource to clean up + * + * Should be used by resource manager backends to clean up the TTM resource + * objects before freeing the underlying structure. Makes sure the resource is + * removed from the LRU before destruction. + * Counterpart of ttm_resource_init(). + */ +void ttm_resource_fini(struct ttm_resource_manager *man, + struct ttm_resource *res) +{ + struct ttm_device *bdev = man->bdev; + + spin_lock(&bdev->lru_lock); + list_del_init(&res->lru.link); + man->usage -= res->size; + spin_unlock(&bdev->lru_lock); +} +EXPORT_SYMBOL(ttm_resource_fini); + +int ttm_resource_alloc(struct ttm_buffer_object *bo, + const struct ttm_place *place, + struct ttm_resource **res_ptr, + struct dmem_cgroup_pool_state **ret_limit_pool) +{ + struct ttm_resource_manager *man = + ttm_manager_type(bo->bdev, place->mem_type); + struct dmem_cgroup_pool_state *pool = NULL; + int ret; + + if (man->cg) { + ret = dmem_cgroup_try_charge(man->cg, bo->base.size, &pool, ret_limit_pool); + if (ret) + return ret; + } + + ret = man->func->alloc(man, bo, place, res_ptr); + if (ret) { + if (pool) + dmem_cgroup_uncharge(pool, bo->base.size); + return ret; + } + + (*res_ptr)->css = pool; + + spin_lock(&bo->bdev->lru_lock); + ttm_resource_add_bulk_move(*res_ptr, bo); + spin_unlock(&bo->bdev->lru_lock); + return 0; +} +EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_resource_alloc); + +void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource **res) +{ + struct ttm_resource_manager *man; + struct dmem_cgroup_pool_state *pool; + + if (!*res) + return; + + spin_lock(&bo->bdev->lru_lock); + ttm_resource_del_bulk_move(*res, bo); + spin_unlock(&bo->bdev->lru_lock); + + pool = (*res)->css; + man = ttm_manager_type(bo->bdev, (*res)->mem_type); + man->func->free(man, *res); + *res = NULL; + if (man->cg) + dmem_cgroup_uncharge(pool, bo->base.size); +} +EXPORT_SYMBOL(ttm_resource_free); + +/** + * ttm_resource_intersects - test for intersection + * + * @bdev: TTM device structure + * @res: The resource to test + * @place: The placement to test + * @size: How many bytes the new allocation needs. + * + * Test if @res intersects with @place and @size. Used for testing if evictions + * are valueable or not. + * + * Returns true if the res placement intersects with @place and @size. + */ +bool ttm_resource_intersects(struct ttm_device *bdev, + struct ttm_resource *res, + const struct ttm_place *place, + size_t size) +{ + struct ttm_resource_manager *man; + + if (!res) + return false; + + man = ttm_manager_type(bdev, res->mem_type); + if (!place || !man->func->intersects) + return true; + + return man->func->intersects(man, res, place, size); +} + +/** + * ttm_resource_compatible - check if resource is compatible with placement + * + * @res: the resource to check + * @placement: the placement to check against + * @evicting: true if the caller is doing evictions + * + * Returns true if the placement is compatible. + */ +bool ttm_resource_compatible(struct ttm_resource *res, + struct ttm_placement *placement, + bool evicting) +{ + struct ttm_buffer_object *bo = res->bo; + struct ttm_device *bdev = bo->bdev; + unsigned i; + + if (res->placement & TTM_PL_FLAG_TEMPORARY) + return false; + + for (i = 0; i < placement->num_placement; i++) { + const struct ttm_place *place = &placement->placement[i]; + struct ttm_resource_manager *man; + + if (res->mem_type != place->mem_type) + continue; + + if (place->flags & (evicting ? TTM_PL_FLAG_DESIRED : + TTM_PL_FLAG_FALLBACK)) + continue; + + if (place->flags & TTM_PL_FLAG_CONTIGUOUS && + !(res->placement & TTM_PL_FLAG_CONTIGUOUS)) + continue; + + man = ttm_manager_type(bdev, res->mem_type); + if (man->func->compatible && + !man->func->compatible(man, res, place, bo->base.size)) + continue; + + return true; + } + return false; +} + +void ttm_resource_set_bo(struct ttm_resource *res, + struct ttm_buffer_object *bo) +{ + spin_lock(&bo->bdev->lru_lock); + res->bo = bo; + spin_unlock(&bo->bdev->lru_lock); +} + +/** + * ttm_resource_manager_init + * + * @man: memory manager object to init + * @bdev: ttm device this manager belongs to + * @size: size of managed resources in arbitrary units + * + * Initialise core parts of a manager object. + */ +void ttm_resource_manager_init(struct ttm_resource_manager *man, + struct ttm_device *bdev, + uint64_t size) +{ + unsigned i; + + man->bdev = bdev; + man->size = size; + man->usage = 0; + + for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) + INIT_LIST_HEAD(&man->lru[i]); + spin_lock_init(&man->eviction_lock); + for (i = 0; i < TTM_NUM_MOVE_FENCES; i++) + man->eviction_fences[i] = NULL; +} +EXPORT_SYMBOL(ttm_resource_manager_init); + +/* + * ttm_resource_manager_evict_all + * + * @bdev - device to use + * @man - manager to use + * + * Evict all the objects out of a memory manager until it is empty. + * Part of memory manager cleanup sequence. + */ +int ttm_resource_manager_evict_all(struct ttm_device *bdev, + struct ttm_resource_manager *man) +{ + struct ttm_operation_ctx ctx = { + .interruptible = false, + .no_wait_gpu = false, + }; + struct dma_fence *fence; + int ret, i; + + do { + ret = ttm_bo_evict_first(bdev, man, &ctx); + cond_resched(); + } while (!ret); + + if (ret && ret != -ENOENT) + return ret; + + ret = 0; + + spin_lock(&man->eviction_lock); + for (i = 0; i < TTM_NUM_MOVE_FENCES; i++) { + fence = man->eviction_fences[i]; + if (fence && !dma_fence_is_signaled(fence)) { + dma_fence_get(fence); + spin_unlock(&man->eviction_lock); + ret = dma_fence_wait(fence, false); + dma_fence_put(fence); + if (ret) + return ret; + spin_lock(&man->eviction_lock); + } + } + spin_unlock(&man->eviction_lock); + + return ret; +} +EXPORT_SYMBOL(ttm_resource_manager_evict_all); + +/** + * ttm_resource_manager_usage + * + * @man: A memory manager object. + * + * Return how many resources are currently used. + */ +uint64_t ttm_resource_manager_usage(struct ttm_resource_manager *man) +{ + uint64_t usage; + + if (WARN_ON_ONCE(!man->bdev)) + return 0; + + spin_lock(&man->bdev->lru_lock); + usage = man->usage; + spin_unlock(&man->bdev->lru_lock); + return usage; +} +EXPORT_SYMBOL(ttm_resource_manager_usage); + +/** + * ttm_resource_manager_debug + * + * @man: manager type to dump. + * @p: printer to use for debug. + */ +void ttm_resource_manager_debug(struct ttm_resource_manager *man, + struct drm_printer *p) +{ + drm_printf(p, " use_type: %d\n", man->use_type); + drm_printf(p, " use_tt: %d\n", man->use_tt); + drm_printf(p, " size: %llu\n", man->size); + drm_printf(p, " usage: %llu\n", ttm_resource_manager_usage(man)); + if (man->func->debug) + man->func->debug(man, p); +} +EXPORT_SYMBOL(ttm_resource_manager_debug); + +static void +ttm_resource_cursor_check_bulk(struct ttm_resource_cursor *cursor, + struct ttm_lru_item *next_lru) +{ + struct ttm_resource *next = ttm_lru_item_to_res(next_lru); + struct ttm_lru_bulk_move *bulk = NULL; + struct ttm_buffer_object *bo = next->bo; + + lockdep_assert_held(&cursor->man->bdev->lru_lock); + bulk = bo->bulk_move; + + if (cursor->bulk != bulk) { + if (bulk) { + list_move_tail(&cursor->bulk_link, &bulk->cursor_list); + cursor->mem_type = next->mem_type; + } else { + list_del_init(&cursor->bulk_link); + } + cursor->bulk = bulk; + } +} + +/** + * ttm_resource_manager_first() - Start iterating over the resources + * of a resource manager + * @cursor: cursor to record the position + * + * Initializes the cursor and starts iterating. When done iterating, + * the caller must explicitly call ttm_resource_cursor_fini(). + * + * Return: The first resource from the resource manager. + */ +struct ttm_resource * +ttm_resource_manager_first(struct ttm_resource_cursor *cursor) +{ + struct ttm_resource_manager *man = cursor->man; + + if (WARN_ON_ONCE(!man)) + return NULL; + + lockdep_assert_held(&man->bdev->lru_lock); + + list_move(&cursor->hitch.link, &man->lru[cursor->priority]); + return ttm_resource_manager_next(cursor); +} + +/** + * ttm_resource_manager_next() - Continue iterating over the resource manager + * resources + * @cursor: cursor to record the position + * + * Return: the next resource from the resource manager. + */ +struct ttm_resource * +ttm_resource_manager_next(struct ttm_resource_cursor *cursor) +{ + struct ttm_resource_manager *man = cursor->man; + struct ttm_lru_item *lru; + + lockdep_assert_held(&man->bdev->lru_lock); + + for (;;) { + lru = &cursor->hitch; + list_for_each_entry_continue(lru, &man->lru[cursor->priority], link) { + if (ttm_lru_item_is_res(lru)) { + ttm_resource_cursor_check_bulk(cursor, lru); + list_move(&cursor->hitch.link, &lru->link); + return ttm_lru_item_to_res(lru); + } + } + + if (++cursor->priority >= TTM_MAX_BO_PRIORITY) + break; + + list_move(&cursor->hitch.link, &man->lru[cursor->priority]); + ttm_resource_cursor_clear_bulk(cursor); + } + + return NULL; +} + +/** + * ttm_lru_first_res_or_null() - Return the first resource on an lru list + * @head: The list head of the lru list. + * + * Return: Pointer to the first resource on the lru list or NULL if + * there is none. + */ +struct ttm_resource *ttm_lru_first_res_or_null(struct list_head *head) +{ + struct ttm_lru_item *lru; + + list_for_each_entry(lru, head, link) { + if (ttm_lru_item_is_res(lru)) + return ttm_lru_item_to_res(lru); + } + + return NULL; +} + +static void ttm_kmap_iter_iomap_map_local(struct ttm_kmap_iter *iter, + struct iosys_map *dmap, + pgoff_t i) +{ + struct ttm_kmap_iter_iomap *iter_io = + container_of(iter, typeof(*iter_io), base); + void __iomem *addr; + +retry: + while (i >= iter_io->cache.end) { + iter_io->cache.sg = iter_io->cache.sg ? + sg_next(iter_io->cache.sg) : iter_io->st->sgl; + iter_io->cache.i = iter_io->cache.end; + iter_io->cache.end += sg_dma_len(iter_io->cache.sg) >> + PAGE_SHIFT; + iter_io->cache.offs = sg_dma_address(iter_io->cache.sg) - + iter_io->start; + } + + if (i < iter_io->cache.i) { + iter_io->cache.end = 0; + iter_io->cache.sg = NULL; + goto retry; + } + + addr = io_mapping_map_local_wc(iter_io->iomap, iter_io->cache.offs + + (((resource_size_t)i - iter_io->cache.i) + << PAGE_SHIFT)); + iosys_map_set_vaddr_iomem(dmap, addr); +} + +static void ttm_kmap_iter_iomap_unmap_local(struct ttm_kmap_iter *iter, + struct iosys_map *map) +{ + io_mapping_unmap_local(map->vaddr_iomem); +} + +static const struct ttm_kmap_iter_ops ttm_kmap_iter_io_ops = { + .map_local = ttm_kmap_iter_iomap_map_local, + .unmap_local = ttm_kmap_iter_iomap_unmap_local, + .maps_tt = false, +}; + +/** + * ttm_kmap_iter_iomap_init - Initialize a struct ttm_kmap_iter_iomap + * @iter_io: The struct ttm_kmap_iter_iomap to initialize. + * @iomap: The struct io_mapping representing the underlying linear io_memory. + * @st: sg_table into @iomap, representing the memory of the struct + * ttm_resource. + * @start: Offset that needs to be subtracted from @st to make + * sg_dma_address(st->sgl) - @start == 0 for @iomap start. + * + * Return: Pointer to the embedded struct ttm_kmap_iter. + */ +struct ttm_kmap_iter * +ttm_kmap_iter_iomap_init(struct ttm_kmap_iter_iomap *iter_io, + struct io_mapping *iomap, + struct sg_table *st, + resource_size_t start) +{ + iter_io->base.ops = &ttm_kmap_iter_io_ops; + iter_io->iomap = iomap; + iter_io->st = st; + iter_io->start = start; + memset(&iter_io->cache, 0, sizeof(iter_io->cache)); + + return &iter_io->base; +} +EXPORT_SYMBOL(ttm_kmap_iter_iomap_init); + +/** + * DOC: Linear io iterator + * + * This code should die in the not too near future. Best would be if we could + * make io-mapping use memremap for all io memory, and have memremap + * implement a kmap_local functionality. We could then strip a huge amount of + * code. These linear io iterators are implemented to mimic old functionality, + * and they don't use kmap_local semantics at all internally. Rather ioremap or + * friends, and at least on 32-bit they add global TLB flushes and points + * of failure. + */ + +static void ttm_kmap_iter_linear_io_map_local(struct ttm_kmap_iter *iter, + struct iosys_map *dmap, + pgoff_t i) +{ + struct ttm_kmap_iter_linear_io *iter_io = + container_of(iter, typeof(*iter_io), base); + + *dmap = iter_io->dmap; + iosys_map_incr(dmap, i * PAGE_SIZE); +} + +static const struct ttm_kmap_iter_ops ttm_kmap_iter_linear_io_ops = { + .map_local = ttm_kmap_iter_linear_io_map_local, + .maps_tt = false, +}; + +/** + * ttm_kmap_iter_linear_io_init - Initialize an iterator for linear io memory + * @iter_io: The iterator to initialize + * @bdev: The TTM device + * @mem: The ttm resource representing the iomap. + * + * This function is for internal TTM use only. It sets up a memcpy kmap iterator + * pointing at a linear chunk of io memory. + * + * Return: A pointer to the embedded struct ttm_kmap_iter or error pointer on + * failure. + */ +struct ttm_kmap_iter * +ttm_kmap_iter_linear_io_init(struct ttm_kmap_iter_linear_io *iter_io, + struct ttm_device *bdev, + struct ttm_resource *mem) +{ + int ret; + + ret = ttm_mem_io_reserve(bdev, mem); + if (ret) + goto out_err; + if (!mem->bus.is_iomem) { + ret = -EINVAL; + goto out_io_free; + } + + if (mem->bus.addr) { + iosys_map_set_vaddr(&iter_io->dmap, mem->bus.addr); + iter_io->needs_unmap = false; + } else { + iter_io->needs_unmap = true; + memset(&iter_io->dmap, 0, sizeof(iter_io->dmap)); + if (mem->bus.caching == ttm_write_combined) + iosys_map_set_vaddr_iomem(&iter_io->dmap, + ioremap_wc(mem->bus.offset, + mem->size)); + else if (mem->bus.caching == ttm_cached) + iosys_map_set_vaddr(&iter_io->dmap, + memremap(mem->bus.offset, mem->size, + MEMREMAP_WB | + MEMREMAP_WT | + MEMREMAP_WC)); + + /* If uncached requested or if mapping cached or wc failed */ + if (iosys_map_is_null(&iter_io->dmap)) + iosys_map_set_vaddr_iomem(&iter_io->dmap, + ioremap(mem->bus.offset, + mem->size)); + + if (iosys_map_is_null(&iter_io->dmap)) { + ret = -ENOMEM; + goto out_io_free; + } + } + + iter_io->base.ops = &ttm_kmap_iter_linear_io_ops; + return &iter_io->base; + +out_io_free: + ttm_mem_io_free(bdev, mem); +out_err: + return ERR_PTR(ret); +} + +/** + * ttm_kmap_iter_linear_io_fini - Clean up an iterator for linear io memory + * @iter_io: The iterator to initialize + * @bdev: The TTM device + * @mem: The ttm resource representing the iomap. + * + * This function is for internal TTM use only. It cleans up a memcpy kmap + * iterator initialized by ttm_kmap_iter_linear_io_init. + */ +void +ttm_kmap_iter_linear_io_fini(struct ttm_kmap_iter_linear_io *iter_io, + struct ttm_device *bdev, + struct ttm_resource *mem) +{ + if (iter_io->needs_unmap && iosys_map_is_set(&iter_io->dmap)) { + if (iter_io->dmap.is_iomem) + iounmap(iter_io->dmap.vaddr_iomem); + else + memunmap(iter_io->dmap.vaddr); + } + + ttm_mem_io_free(bdev, mem); +} + +#if defined(CONFIG_DEBUG_FS) + +static int ttm_resource_manager_show(struct seq_file *m, void *unused) +{ + struct ttm_resource_manager *man = + (struct ttm_resource_manager *)m->private; + struct drm_printer p = drm_seq_file_printer(m); + ttm_resource_manager_debug(man, &p); + return 0; +} +DEFINE_SHOW_ATTRIBUTE(ttm_resource_manager); + +#endif + +/** + * ttm_resource_manager_create_debugfs - Create debugfs entry for specified + * resource manager. + * @man: The TTM resource manager for which the debugfs stats file be creates + * @parent: debugfs directory in which the file will reside + * @name: The filename to create. + * + * This function setups up a debugfs file that can be used to look + * at debug statistics of the specified ttm_resource_manager. + */ +void ttm_resource_manager_create_debugfs(struct ttm_resource_manager *man, + struct dentry * parent, + const char *name) +{ +#if defined(CONFIG_DEBUG_FS) + debugfs_create_file(name, 0444, parent, man, &ttm_resource_manager_fops); +#endif +} +EXPORT_SYMBOL(ttm_resource_manager_create_debugfs); |