| /* |
| * Copyright © 2008-2010 Intel Corporation |
| * |
| * 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 (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 NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS 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: |
| * Eric Anholt <eric@anholt.net> |
| * Chris Wilson <chris@chris-wilson.co.uuk> |
| * |
| */ |
| |
| #include <drm/drmP.h> |
| #include <drm/i915_drm.h> |
| |
| #include "i915_drv.h" |
| #include "intel_drv.h" |
| #include "i915_trace.h" |
| |
| static int switch_to_pinned_context(struct drm_i915_private *dev_priv) |
| { |
| struct intel_engine_cs *engine; |
| |
| if (i915.enable_execlists) |
| return 0; |
| |
| for_each_engine(engine, dev_priv) { |
| struct drm_i915_gem_request *req; |
| int ret; |
| |
| if (engine->last_context == NULL) |
| continue; |
| |
| if (engine->last_context == dev_priv->kernel_context) |
| continue; |
| |
| req = i915_gem_request_alloc(engine, dev_priv->kernel_context); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| ret = i915_switch_context(req); |
| i915_add_request_no_flush(req); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| |
| static bool |
| mark_free(struct i915_vma *vma, struct list_head *unwind) |
| { |
| if (vma->pin_count) |
| return false; |
| |
| if (WARN_ON(!list_empty(&vma->exec_list))) |
| return false; |
| |
| list_add(&vma->exec_list, unwind); |
| return drm_mm_scan_add_block(&vma->node); |
| } |
| |
| /** |
| * i915_gem_evict_something - Evict vmas to make room for binding a new one |
| * @dev: drm_device |
| * @vm: address space to evict from |
| * @min_size: size of the desired free space |
| * @alignment: alignment constraint of the desired free space |
| * @cache_level: cache_level for the desired space |
| * @start: start (inclusive) of the range from which to evict objects |
| * @end: end (exclusive) of the range from which to evict objects |
| * @flags: additional flags to control the eviction algorithm |
| * |
| * This function will try to evict vmas until a free space satisfying the |
| * requirements is found. Callers must check first whether any such hole exists |
| * already before calling this function. |
| * |
| * This function is used by the object/vma binding code. |
| * |
| * Since this function is only used to free up virtual address space it only |
| * ignores pinned vmas, and not object where the backing storage itself is |
| * pinned. Hence obj->pages_pin_count does not protect against eviction. |
| * |
| * To clarify: This is for freeing up virtual address space, not for freeing |
| * memory in e.g. the shrinker. |
| */ |
| int |
| i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm, |
| int min_size, unsigned alignment, unsigned cache_level, |
| unsigned long start, unsigned long end, |
| unsigned flags) |
| { |
| struct list_head eviction_list, unwind_list; |
| struct i915_vma *vma; |
| int ret = 0; |
| int pass = 0; |
| |
| trace_i915_gem_evict(dev, min_size, alignment, flags); |
| |
| /* |
| * The goal is to evict objects and amalgamate space in LRU order. |
| * The oldest idle objects reside on the inactive list, which is in |
| * retirement order. The next objects to retire are those on the (per |
| * ring) active list that do not have an outstanding flush. Once the |
| * hardware reports completion (the seqno is updated after the |
| * batchbuffer has been finished) the clean buffer objects would |
| * be retired to the inactive list. Any dirty objects would be added |
| * to the tail of the flushing list. So after processing the clean |
| * active objects we need to emit a MI_FLUSH to retire the flushing |
| * list, hence the retirement order of the flushing list is in |
| * advance of the dirty objects on the active lists. |
| * |
| * The retirement sequence is thus: |
| * 1. Inactive objects (already retired) |
| * 2. Clean active objects |
| * 3. Flushing list |
| * 4. Dirty active objects. |
| * |
| * On each list, the oldest objects lie at the HEAD with the freshest |
| * object on the TAIL. |
| */ |
| |
| INIT_LIST_HEAD(&unwind_list); |
| if (start != 0 || end != vm->total) { |
| drm_mm_init_scan_with_range(&vm->mm, min_size, |
| alignment, cache_level, |
| start, end); |
| } else |
| drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level); |
| |
| search_again: |
| /* First see if there is a large enough contiguous idle region... */ |
| list_for_each_entry(vma, &vm->inactive_list, vm_link) { |
| if (mark_free(vma, &unwind_list)) |
| goto found; |
| } |
| |
| if (flags & PIN_NONBLOCK) |
| goto none; |
| |
| /* Now merge in the soon-to-be-expired objects... */ |
| list_for_each_entry(vma, &vm->active_list, vm_link) { |
| if (mark_free(vma, &unwind_list)) |
| goto found; |
| } |
| |
| none: |
| /* Nothing found, clean up and bail out! */ |
| while (!list_empty(&unwind_list)) { |
| vma = list_first_entry(&unwind_list, |
| struct i915_vma, |
| exec_list); |
| ret = drm_mm_scan_remove_block(&vma->node); |
| BUG_ON(ret); |
| |
| list_del_init(&vma->exec_list); |
| } |
| |
| /* Can we unpin some objects such as idle hw contents, |
| * or pending flips? |
| */ |
| if (flags & PIN_NONBLOCK) |
| return -ENOSPC; |
| |
| /* Only idle the GPU and repeat the search once */ |
| if (pass++ == 0) { |
| struct drm_i915_private *dev_priv = to_i915(dev); |
| |
| if (i915_is_ggtt(vm)) { |
| ret = switch_to_pinned_context(dev_priv); |
| if (ret) |
| return ret; |
| } |
| |
| ret = i915_gem_wait_for_idle(dev_priv); |
| if (ret) |
| return ret; |
| |
| i915_gem_retire_requests(dev_priv); |
| goto search_again; |
| } |
| |
| /* If we still have pending pageflip completions, drop |
| * back to userspace to give our workqueues time to |
| * acquire our locks and unpin the old scanouts. |
| */ |
| return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC; |
| |
| found: |
| /* drm_mm doesn't allow any other other operations while |
| * scanning, therefore store to be evicted objects on a |
| * temporary list. */ |
| INIT_LIST_HEAD(&eviction_list); |
| while (!list_empty(&unwind_list)) { |
| vma = list_first_entry(&unwind_list, |
| struct i915_vma, |
| exec_list); |
| if (drm_mm_scan_remove_block(&vma->node)) { |
| list_move(&vma->exec_list, &eviction_list); |
| drm_gem_object_reference(&vma->obj->base); |
| continue; |
| } |
| list_del_init(&vma->exec_list); |
| } |
| |
| /* Unbinding will emit any required flushes */ |
| while (!list_empty(&eviction_list)) { |
| struct drm_gem_object *obj; |
| vma = list_first_entry(&eviction_list, |
| struct i915_vma, |
| exec_list); |
| |
| obj = &vma->obj->base; |
| list_del_init(&vma->exec_list); |
| if (ret == 0) |
| ret = i915_vma_unbind(vma); |
| |
| drm_gem_object_unreference(obj); |
| } |
| |
| return ret; |
| } |
| |
| int |
| i915_gem_evict_for_vma(struct i915_vma *target) |
| { |
| struct drm_mm_node *node, *next; |
| |
| list_for_each_entry_safe(node, next, |
| &target->vm->mm.head_node.node_list, |
| node_list) { |
| struct i915_vma *vma; |
| int ret; |
| |
| if (node->start + node->size <= target->node.start) |
| continue; |
| if (node->start >= target->node.start + target->node.size) |
| break; |
| |
| vma = container_of(node, typeof(*vma), node); |
| |
| if (vma->pin_count) { |
| if (!vma->exec_entry || (vma->pin_count > 1)) |
| /* Object is pinned for some other use */ |
| return -EBUSY; |
| |
| /* We need to evict a buffer in the same batch */ |
| if (vma->exec_entry->flags & EXEC_OBJECT_PINNED) |
| /* Overlapping fixed objects in the same batch */ |
| return -EINVAL; |
| |
| return -ENOSPC; |
| } |
| |
| ret = i915_vma_unbind(vma); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * i915_gem_evict_vm - Evict all idle vmas from a vm |
| * @vm: Address space to cleanse |
| * @do_idle: Boolean directing whether to idle first. |
| * |
| * This function evicts all idles vmas from a vm. If all unpinned vmas should be |
| * evicted the @do_idle needs to be set to true. |
| * |
| * This is used by the execbuf code as a last-ditch effort to defragment the |
| * address space. |
| * |
| * To clarify: This is for freeing up virtual address space, not for freeing |
| * memory in e.g. the shrinker. |
| */ |
| int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle) |
| { |
| struct i915_vma *vma, *next; |
| int ret; |
| |
| WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex)); |
| trace_i915_gem_evict_vm(vm); |
| |
| if (do_idle) { |
| struct drm_i915_private *dev_priv = to_i915(vm->dev); |
| |
| if (i915_is_ggtt(vm)) { |
| ret = switch_to_pinned_context(dev_priv); |
| if (ret) |
| return ret; |
| } |
| |
| ret = i915_gem_wait_for_idle(dev_priv); |
| if (ret) |
| return ret; |
| |
| i915_gem_retire_requests(dev_priv); |
| |
| WARN_ON(!list_empty(&vm->active_list)); |
| } |
| |
| list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link) |
| if (vma->pin_count == 0) |
| WARN_ON(i915_vma_unbind(vma)); |
| |
| return 0; |
| } |