| /* SPDX-License-Identifier: GPL-2.0 OR MIT */ |
| /************************************************************************** |
| * |
| * Copyright (c) 2007-2009 VMware, Inc., Palo Alto, CA., USA |
| * All Rights Reserved. |
| * |
| * 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, sub license, 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 (including the |
| * next paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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: Thomas Hellstrom <thellstrom-at-vmware-dot-com> |
| */ |
| |
| #include <drm/ttm/ttm_bo_driver.h> |
| #include <drm/ttm/ttm_placement.h> |
| #include <drm/drm_cache.h> |
| #include <drm/drm_vma_manager.h> |
| #include <linux/dma-buf-map.h> |
| #include <linux/io.h> |
| #include <linux/highmem.h> |
| #include <linux/wait.h> |
| #include <linux/slab.h> |
| #include <linux/vmalloc.h> |
| #include <linux/module.h> |
| #include <linux/dma-resv.h> |
| |
| struct ttm_transfer_obj { |
| struct ttm_buffer_object base; |
| struct ttm_buffer_object *bo; |
| }; |
| |
| int ttm_mem_io_reserve(struct ttm_device *bdev, |
| struct ttm_resource *mem) |
| { |
| if (mem->bus.offset || mem->bus.addr) |
| return 0; |
| |
| mem->bus.is_iomem = false; |
| if (!bdev->funcs->io_mem_reserve) |
| return 0; |
| |
| return bdev->funcs->io_mem_reserve(bdev, mem); |
| } |
| |
| void ttm_mem_io_free(struct ttm_device *bdev, |
| struct ttm_resource *mem) |
| { |
| if (!mem) |
| return; |
| |
| if (!mem->bus.offset && !mem->bus.addr) |
| return; |
| |
| if (bdev->funcs->io_mem_free) |
| bdev->funcs->io_mem_free(bdev, mem); |
| |
| mem->bus.offset = 0; |
| mem->bus.addr = NULL; |
| } |
| |
| /** |
| * ttm_move_memcpy - Helper to perform a memcpy ttm move operation. |
| * @bo: The struct ttm_buffer_object. |
| * @new_mem: The struct ttm_resource we're moving to (copy destination). |
| * @new_iter: A struct ttm_kmap_iter representing the destination resource. |
| * @src_iter: A struct ttm_kmap_iter representing the source resource. |
| * |
| * This function is intended to be able to move out async under a |
| * dma-fence if desired. |
| */ |
| void ttm_move_memcpy(struct ttm_buffer_object *bo, |
| u32 num_pages, |
| struct ttm_kmap_iter *dst_iter, |
| struct ttm_kmap_iter *src_iter) |
| { |
| const struct ttm_kmap_iter_ops *dst_ops = dst_iter->ops; |
| const struct ttm_kmap_iter_ops *src_ops = src_iter->ops; |
| struct ttm_tt *ttm = bo->ttm; |
| struct dma_buf_map src_map, dst_map; |
| pgoff_t i; |
| |
| /* Single TTM move. NOP */ |
| if (dst_ops->maps_tt && src_ops->maps_tt) |
| return; |
| |
| /* Don't move nonexistent data. Clear destination instead. */ |
| if (src_ops->maps_tt && (!ttm || !ttm_tt_is_populated(ttm))) { |
| if (ttm && !(ttm->page_flags & TTM_PAGE_FLAG_ZERO_ALLOC)) |
| return; |
| |
| for (i = 0; i < num_pages; ++i) { |
| dst_ops->map_local(dst_iter, &dst_map, i); |
| if (dst_map.is_iomem) |
| memset_io(dst_map.vaddr_iomem, 0, PAGE_SIZE); |
| else |
| memset(dst_map.vaddr, 0, PAGE_SIZE); |
| if (dst_ops->unmap_local) |
| dst_ops->unmap_local(dst_iter, &dst_map); |
| } |
| return; |
| } |
| |
| for (i = 0; i < num_pages; ++i) { |
| dst_ops->map_local(dst_iter, &dst_map, i); |
| src_ops->map_local(src_iter, &src_map, i); |
| |
| drm_memcpy_from_wc(&dst_map, &src_map, PAGE_SIZE); |
| |
| if (src_ops->unmap_local) |
| src_ops->unmap_local(src_iter, &src_map); |
| if (dst_ops->unmap_local) |
| dst_ops->unmap_local(dst_iter, &dst_map); |
| } |
| } |
| EXPORT_SYMBOL(ttm_move_memcpy); |
| |
| int ttm_bo_move_memcpy(struct ttm_buffer_object *bo, |
| struct ttm_operation_ctx *ctx, |
| struct ttm_resource *dst_mem) |
| { |
| struct ttm_device *bdev = bo->bdev; |
| struct ttm_resource_manager *dst_man = |
| ttm_manager_type(bo->bdev, dst_mem->mem_type); |
| struct ttm_tt *ttm = bo->ttm; |
| struct ttm_resource *src_mem = bo->resource; |
| struct ttm_resource_manager *src_man = |
| ttm_manager_type(bdev, src_mem->mem_type); |
| union { |
| struct ttm_kmap_iter_tt tt; |
| struct ttm_kmap_iter_linear_io io; |
| } _dst_iter, _src_iter; |
| struct ttm_kmap_iter *dst_iter, *src_iter; |
| int ret = 0; |
| |
| if (ttm && ((ttm->page_flags & TTM_PAGE_FLAG_SWAPPED) || |
| dst_man->use_tt)) { |
| ret = ttm_tt_populate(bdev, ttm, ctx); |
| if (ret) |
| return ret; |
| } |
| |
| dst_iter = ttm_kmap_iter_linear_io_init(&_dst_iter.io, bdev, dst_mem); |
| if (PTR_ERR(dst_iter) == -EINVAL && dst_man->use_tt) |
| dst_iter = ttm_kmap_iter_tt_init(&_dst_iter.tt, bo->ttm); |
| if (IS_ERR(dst_iter)) |
| return PTR_ERR(dst_iter); |
| |
| src_iter = ttm_kmap_iter_linear_io_init(&_src_iter.io, bdev, src_mem); |
| if (PTR_ERR(src_iter) == -EINVAL && src_man->use_tt) |
| src_iter = ttm_kmap_iter_tt_init(&_src_iter.tt, bo->ttm); |
| if (IS_ERR(src_iter)) { |
| ret = PTR_ERR(src_iter); |
| goto out_src_iter; |
| } |
| |
| ttm_move_memcpy(bo, dst_mem->num_pages, dst_iter, src_iter); |
| |
| if (!src_iter->ops->maps_tt) |
| ttm_kmap_iter_linear_io_fini(&_src_iter.io, bdev, src_mem); |
| ttm_bo_move_sync_cleanup(bo, dst_mem); |
| |
| out_src_iter: |
| if (!dst_iter->ops->maps_tt) |
| ttm_kmap_iter_linear_io_fini(&_dst_iter.io, bdev, dst_mem); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(ttm_bo_move_memcpy); |
| |
| static void ttm_transfered_destroy(struct ttm_buffer_object *bo) |
| { |
| struct ttm_transfer_obj *fbo; |
| |
| fbo = container_of(bo, struct ttm_transfer_obj, base); |
| dma_resv_fini(&fbo->base.base._resv); |
| ttm_bo_put(fbo->bo); |
| kfree(fbo); |
| } |
| |
| /** |
| * ttm_buffer_object_transfer |
| * |
| * @bo: A pointer to a struct ttm_buffer_object. |
| * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object, |
| * holding the data of @bo with the old placement. |
| * |
| * This is a utility function that may be called after an accelerated move |
| * has been scheduled. A new buffer object is created as a placeholder for |
| * the old data while it's being copied. When that buffer object is idle, |
| * it can be destroyed, releasing the space of the old placement. |
| * Returns: |
| * !0: Failure. |
| */ |
| |
| static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo, |
| struct ttm_buffer_object **new_obj) |
| { |
| struct ttm_transfer_obj *fbo; |
| int ret; |
| |
| fbo = kmalloc(sizeof(*fbo), GFP_KERNEL); |
| if (!fbo) |
| return -ENOMEM; |
| |
| fbo->base = *bo; |
| |
| ttm_bo_get(bo); |
| fbo->bo = bo; |
| |
| /** |
| * Fix up members that we shouldn't copy directly: |
| * TODO: Explicit member copy would probably be better here. |
| */ |
| |
| atomic_inc(&ttm_glob.bo_count); |
| INIT_LIST_HEAD(&fbo->base.ddestroy); |
| INIT_LIST_HEAD(&fbo->base.lru); |
| fbo->base.moving = NULL; |
| drm_vma_node_reset(&fbo->base.base.vma_node); |
| |
| kref_init(&fbo->base.kref); |
| fbo->base.destroy = &ttm_transfered_destroy; |
| fbo->base.pin_count = 0; |
| if (bo->type != ttm_bo_type_sg) |
| fbo->base.base.resv = &fbo->base.base._resv; |
| |
| dma_resv_init(&fbo->base.base._resv); |
| fbo->base.base.dev = NULL; |
| ret = dma_resv_trylock(&fbo->base.base._resv); |
| WARN_ON(!ret); |
| |
| ttm_bo_move_to_lru_tail_unlocked(&fbo->base); |
| |
| *new_obj = &fbo->base; |
| return 0; |
| } |
| |
| pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res, |
| pgprot_t tmp) |
| { |
| struct ttm_resource_manager *man; |
| enum ttm_caching caching; |
| |
| man = ttm_manager_type(bo->bdev, res->mem_type); |
| caching = man->use_tt ? bo->ttm->caching : res->bus.caching; |
| |
| return ttm_prot_from_caching(caching, tmp); |
| } |
| EXPORT_SYMBOL(ttm_io_prot); |
| |
| static int ttm_bo_ioremap(struct ttm_buffer_object *bo, |
| unsigned long offset, |
| unsigned long size, |
| struct ttm_bo_kmap_obj *map) |
| { |
| struct ttm_resource *mem = bo->resource; |
| |
| if (bo->resource->bus.addr) { |
| map->bo_kmap_type = ttm_bo_map_premapped; |
| map->virtual = ((u8 *)bo->resource->bus.addr) + offset; |
| } else { |
| resource_size_t res = bo->resource->bus.offset + offset; |
| |
| map->bo_kmap_type = ttm_bo_map_iomap; |
| if (mem->bus.caching == ttm_write_combined) |
| map->virtual = ioremap_wc(res, size); |
| #ifdef CONFIG_X86 |
| else if (mem->bus.caching == ttm_cached) |
| map->virtual = ioremap_cache(res, size); |
| #endif |
| else |
| map->virtual = ioremap(res, size); |
| } |
| return (!map->virtual) ? -ENOMEM : 0; |
| } |
| |
| static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo, |
| unsigned long start_page, |
| unsigned long num_pages, |
| struct ttm_bo_kmap_obj *map) |
| { |
| struct ttm_resource *mem = bo->resource; |
| struct ttm_operation_ctx ctx = { |
| .interruptible = false, |
| .no_wait_gpu = false |
| }; |
| struct ttm_tt *ttm = bo->ttm; |
| pgprot_t prot; |
| int ret; |
| |
| BUG_ON(!ttm); |
| |
| ret = ttm_tt_populate(bo->bdev, ttm, &ctx); |
| if (ret) |
| return ret; |
| |
| if (num_pages == 1 && ttm->caching == ttm_cached) { |
| /* |
| * We're mapping a single page, and the desired |
| * page protection is consistent with the bo. |
| */ |
| |
| map->bo_kmap_type = ttm_bo_map_kmap; |
| map->page = ttm->pages[start_page]; |
| map->virtual = kmap(map->page); |
| } else { |
| /* |
| * We need to use vmap to get the desired page protection |
| * or to make the buffer object look contiguous. |
| */ |
| prot = ttm_io_prot(bo, mem, PAGE_KERNEL); |
| map->bo_kmap_type = ttm_bo_map_vmap; |
| map->virtual = vmap(ttm->pages + start_page, num_pages, |
| 0, prot); |
| } |
| return (!map->virtual) ? -ENOMEM : 0; |
| } |
| |
| int ttm_bo_kmap(struct ttm_buffer_object *bo, |
| unsigned long start_page, unsigned long num_pages, |
| struct ttm_bo_kmap_obj *map) |
| { |
| unsigned long offset, size; |
| int ret; |
| |
| map->virtual = NULL; |
| map->bo = bo; |
| if (num_pages > bo->resource->num_pages) |
| return -EINVAL; |
| if ((start_page + num_pages) > bo->resource->num_pages) |
| return -EINVAL; |
| |
| ret = ttm_mem_io_reserve(bo->bdev, bo->resource); |
| if (ret) |
| return ret; |
| if (!bo->resource->bus.is_iomem) { |
| return ttm_bo_kmap_ttm(bo, start_page, num_pages, map); |
| } else { |
| offset = start_page << PAGE_SHIFT; |
| size = num_pages << PAGE_SHIFT; |
| return ttm_bo_ioremap(bo, offset, size, map); |
| } |
| } |
| EXPORT_SYMBOL(ttm_bo_kmap); |
| |
| void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map) |
| { |
| if (!map->virtual) |
| return; |
| switch (map->bo_kmap_type) { |
| case ttm_bo_map_iomap: |
| iounmap(map->virtual); |
| break; |
| case ttm_bo_map_vmap: |
| vunmap(map->virtual); |
| break; |
| case ttm_bo_map_kmap: |
| kunmap(map->page); |
| break; |
| case ttm_bo_map_premapped: |
| break; |
| default: |
| BUG(); |
| } |
| ttm_mem_io_free(map->bo->bdev, map->bo->resource); |
| map->virtual = NULL; |
| map->page = NULL; |
| } |
| EXPORT_SYMBOL(ttm_bo_kunmap); |
| |
| int ttm_bo_vmap(struct ttm_buffer_object *bo, struct dma_buf_map *map) |
| { |
| struct ttm_resource *mem = bo->resource; |
| int ret; |
| |
| ret = ttm_mem_io_reserve(bo->bdev, mem); |
| if (ret) |
| return ret; |
| |
| if (mem->bus.is_iomem) { |
| void __iomem *vaddr_iomem; |
| |
| if (mem->bus.addr) |
| vaddr_iomem = (void __iomem *)mem->bus.addr; |
| else if (mem->bus.caching == ttm_write_combined) |
| vaddr_iomem = ioremap_wc(mem->bus.offset, |
| bo->base.size); |
| #ifdef CONFIG_X86 |
| else if (mem->bus.caching == ttm_cached) |
| vaddr_iomem = ioremap_cache(mem->bus.offset, |
| bo->base.size); |
| #endif |
| else |
| vaddr_iomem = ioremap(mem->bus.offset, bo->base.size); |
| |
| if (!vaddr_iomem) |
| return -ENOMEM; |
| |
| dma_buf_map_set_vaddr_iomem(map, vaddr_iomem); |
| |
| } else { |
| struct ttm_operation_ctx ctx = { |
| .interruptible = false, |
| .no_wait_gpu = false |
| }; |
| struct ttm_tt *ttm = bo->ttm; |
| pgprot_t prot; |
| void *vaddr; |
| |
| ret = ttm_tt_populate(bo->bdev, ttm, &ctx); |
| if (ret) |
| return ret; |
| |
| /* |
| * We need to use vmap to get the desired page protection |
| * or to make the buffer object look contiguous. |
| */ |
| prot = ttm_io_prot(bo, mem, PAGE_KERNEL); |
| vaddr = vmap(ttm->pages, ttm->num_pages, 0, prot); |
| if (!vaddr) |
| return -ENOMEM; |
| |
| dma_buf_map_set_vaddr(map, vaddr); |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(ttm_bo_vmap); |
| |
| void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct dma_buf_map *map) |
| { |
| struct ttm_resource *mem = bo->resource; |
| |
| if (dma_buf_map_is_null(map)) |
| return; |
| |
| if (!map->is_iomem) |
| vunmap(map->vaddr); |
| else if (!mem->bus.addr) |
| iounmap(map->vaddr_iomem); |
| dma_buf_map_clear(map); |
| |
| ttm_mem_io_free(bo->bdev, bo->resource); |
| } |
| EXPORT_SYMBOL(ttm_bo_vunmap); |
| |
| static int ttm_bo_wait_free_node(struct ttm_buffer_object *bo, |
| bool dst_use_tt) |
| { |
| int ret; |
| ret = ttm_bo_wait(bo, false, false); |
| if (ret) |
| return ret; |
| |
| if (!dst_use_tt) |
| ttm_bo_tt_destroy(bo); |
| ttm_resource_free(bo, &bo->resource); |
| return 0; |
| } |
| |
| static int ttm_bo_move_to_ghost(struct ttm_buffer_object *bo, |
| struct dma_fence *fence, |
| bool dst_use_tt) |
| { |
| struct ttm_buffer_object *ghost_obj; |
| int ret; |
| |
| /** |
| * This should help pipeline ordinary buffer moves. |
| * |
| * Hang old buffer memory on a new buffer object, |
| * and leave it to be released when the GPU |
| * operation has completed. |
| */ |
| |
| dma_fence_put(bo->moving); |
| bo->moving = dma_fence_get(fence); |
| |
| ret = ttm_buffer_object_transfer(bo, &ghost_obj); |
| if (ret) |
| return ret; |
| |
| dma_resv_add_excl_fence(&ghost_obj->base._resv, fence); |
| |
| /** |
| * If we're not moving to fixed memory, the TTM object |
| * needs to stay alive. Otherwhise hang it on the ghost |
| * bo to be unbound and destroyed. |
| */ |
| |
| if (dst_use_tt) |
| ghost_obj->ttm = NULL; |
| else |
| bo->ttm = NULL; |
| bo->resource = NULL; |
| |
| dma_resv_unlock(&ghost_obj->base._resv); |
| ttm_bo_put(ghost_obj); |
| return 0; |
| } |
| |
| static void ttm_bo_move_pipeline_evict(struct ttm_buffer_object *bo, |
| struct dma_fence *fence) |
| { |
| struct ttm_device *bdev = bo->bdev; |
| struct ttm_resource_manager *from; |
| |
| from = ttm_manager_type(bdev, bo->resource->mem_type); |
| |
| /** |
| * BO doesn't have a TTM we need to bind/unbind. Just remember |
| * this eviction and free up the allocation |
| */ |
| spin_lock(&from->move_lock); |
| if (!from->move || dma_fence_is_later(fence, from->move)) { |
| dma_fence_put(from->move); |
| from->move = dma_fence_get(fence); |
| } |
| spin_unlock(&from->move_lock); |
| |
| ttm_resource_free(bo, &bo->resource); |
| |
| dma_fence_put(bo->moving); |
| bo->moving = dma_fence_get(fence); |
| } |
| |
| int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo, |
| struct dma_fence *fence, |
| bool evict, |
| bool pipeline, |
| struct ttm_resource *new_mem) |
| { |
| struct ttm_device *bdev = bo->bdev; |
| struct ttm_resource_manager *from = ttm_manager_type(bdev, bo->resource->mem_type); |
| struct ttm_resource_manager *man = ttm_manager_type(bdev, new_mem->mem_type); |
| int ret = 0; |
| |
| dma_resv_add_excl_fence(bo->base.resv, fence); |
| if (!evict) |
| ret = ttm_bo_move_to_ghost(bo, fence, man->use_tt); |
| else if (!from->use_tt && pipeline) |
| ttm_bo_move_pipeline_evict(bo, fence); |
| else |
| ret = ttm_bo_wait_free_node(bo, man->use_tt); |
| |
| if (ret) |
| return ret; |
| |
| ttm_bo_assign_mem(bo, new_mem); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(ttm_bo_move_accel_cleanup); |
| |
| /** |
| * ttm_bo_pipeline_gutting - purge the contents of a bo |
| * @bo: The buffer object |
| * |
| * Purge the contents of a bo, async if the bo is not idle. |
| * After a successful call, the bo is left unpopulated in |
| * system placement. The function may wait uninterruptible |
| * for idle on OOM. |
| * |
| * Return: 0 if successful, negative error code on failure. |
| */ |
| int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo) |
| { |
| static const struct ttm_place sys_mem = { .mem_type = TTM_PL_SYSTEM }; |
| struct ttm_buffer_object *ghost; |
| struct ttm_resource *sys_res; |
| struct ttm_tt *ttm; |
| int ret; |
| |
| ret = ttm_resource_alloc(bo, &sys_mem, &sys_res); |
| if (ret) |
| return ret; |
| |
| /* If already idle, no need for ghost object dance. */ |
| ret = ttm_bo_wait(bo, false, true); |
| if (ret != -EBUSY) { |
| if (!bo->ttm) { |
| /* See comment below about clearing. */ |
| ret = ttm_tt_create(bo, true); |
| if (ret) |
| goto error_free_sys_mem; |
| } else { |
| ttm_tt_unpopulate(bo->bdev, bo->ttm); |
| if (bo->type == ttm_bo_type_device) |
| ttm_tt_mark_for_clear(bo->ttm); |
| } |
| ttm_resource_free(bo, &bo->resource); |
| ttm_bo_assign_mem(bo, sys_res); |
| return 0; |
| } |
| |
| /* |
| * We need an unpopulated ttm_tt after giving our current one, |
| * if any, to the ghost object. And we can't afford to fail |
| * creating one *after* the operation. If the bo subsequently gets |
| * resurrected, make sure it's cleared (if ttm_bo_type_device) |
| * to avoid leaking sensitive information to user-space. |
| */ |
| |
| ttm = bo->ttm; |
| bo->ttm = NULL; |
| ret = ttm_tt_create(bo, true); |
| swap(bo->ttm, ttm); |
| if (ret) |
| goto error_free_sys_mem; |
| |
| ret = ttm_buffer_object_transfer(bo, &ghost); |
| if (ret) |
| goto error_destroy_tt; |
| |
| ret = dma_resv_copy_fences(&ghost->base._resv, bo->base.resv); |
| /* Last resort, wait for the BO to be idle when we are OOM */ |
| if (ret) |
| ttm_bo_wait(bo, false, false); |
| |
| dma_resv_unlock(&ghost->base._resv); |
| ttm_bo_put(ghost); |
| bo->ttm = ttm; |
| bo->resource = NULL; |
| ttm_bo_assign_mem(bo, sys_res); |
| return 0; |
| |
| error_destroy_tt: |
| ttm_tt_destroy(bo->bdev, ttm); |
| |
| error_free_sys_mem: |
| ttm_resource_free(bo, &sys_res); |
| return ret; |
| } |