From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/gpu/drm/i915/i915_gem_evict.c | 284 ++++++++++++++++++++++++++++++++++ 1 file changed, 284 insertions(+) create mode 100644 drivers/gpu/drm/i915/i915_gem_evict.c (limited to 'drivers/gpu/drm/i915/i915_gem_evict.c') diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c new file mode 100644 index 000000000..d09e35ed9 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_gem_evict.c @@ -0,0 +1,284 @@ +/* + * 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 + * Chris Wilson + * + */ + +#include +#include + +#include "i915_drv.h" +#include "intel_drv.h" +#include "i915_trace.h" + +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, mm_list) { + 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, mm_list) { + 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) { + ret = i915_gpu_idle(dev); + if (ret) + return ret; + + i915_gem_retire_requests(dev); + 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; +} + +/** + * 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) { + ret = i915_gpu_idle(vm->dev); + if (ret) + return ret; + + i915_gem_retire_requests(vm->dev); + + WARN_ON(!list_empty(&vm->active_list)); + } + + list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list) + if (vma->pin_count == 0) + WARN_ON(i915_vma_unbind(vma)); + + return 0; +} + +/** + * i915_gem_evict_everything - Try to evict all objects + * @dev: Device to evict objects for + * + * This functions tries to evict all gem objects from all address spaces. Used + * by the shrinker as a last-ditch effort and for suspend, before releasing the + * backing storage of all unbound objects. + */ +int +i915_gem_evict_everything(struct drm_device *dev) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + struct i915_address_space *vm, *v; + bool lists_empty = true; + int ret; + + list_for_each_entry(vm, &dev_priv->vm_list, global_link) { + lists_empty = (list_empty(&vm->inactive_list) && + list_empty(&vm->active_list)); + if (!lists_empty) + lists_empty = false; + } + + if (lists_empty) + return -ENOSPC; + + trace_i915_gem_evict_everything(dev); + + /* The gpu_idle will flush everything in the write domain to the + * active list. Then we must move everything off the active list + * with retire requests. + */ + ret = i915_gpu_idle(dev); + if (ret) + return ret; + + i915_gem_retire_requests(dev); + + /* Having flushed everything, unbind() should never raise an error */ + list_for_each_entry_safe(vm, v, &dev_priv->vm_list, global_link) + WARN_ON(i915_gem_evict_vm(vm, false)); + + return 0; +} -- cgit v1.2.3-54-g00ecf