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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/gpu/drm/i915/i915_gem_evict.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_evict.c')
-rw-r--r-- | drivers/gpu/drm/i915/i915_gem_evict.c | 545 |
1 files changed, 545 insertions, 0 deletions
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 0000000000..c02ebd6900 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_gem_evict.c @@ -0,0 +1,545 @@ +/* + * 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 "gem/i915_gem_context.h" +#include "gt/intel_gt.h" +#include "gt/intel_gt_requests.h" + +#include "i915_drv.h" +#include "i915_gem_evict.h" +#include "i915_trace.h" + +I915_SELFTEST_DECLARE(static struct igt_evict_ctl { + bool fail_if_busy:1; +} igt_evict_ctl;) + +static bool dying_vma(struct i915_vma *vma) +{ + return !kref_read(&vma->obj->base.refcount); +} + +static int ggtt_flush(struct i915_address_space *vm) +{ + struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm); + struct intel_gt *gt; + int ret = 0; + + list_for_each_entry(gt, &ggtt->gt_list, ggtt_link) { + /* + * Not everything in the GGTT is tracked via vma (otherwise we + * could evict as required with minimal stalling) so we are forced + * to idle the GPU and explicitly retire outstanding requests in + * the hopes that we can then remove contexts and the like only + * bound by their active reference. + */ + ret = intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT); + if (ret) + return ret; + } + return ret; +} + +static bool grab_vma(struct i915_vma *vma, struct i915_gem_ww_ctx *ww) +{ + /* + * We add the extra refcount so the object doesn't drop to zero until + * after ungrab_vma(), this way trylock is always paired with unlock. + */ + if (i915_gem_object_get_rcu(vma->obj)) { + if (!i915_gem_object_trylock(vma->obj, ww)) { + i915_gem_object_put(vma->obj); + return false; + } + } else { + /* Dead objects don't need pins */ + atomic_and(~I915_VMA_PIN_MASK, &vma->flags); + } + + return true; +} + +static void ungrab_vma(struct i915_vma *vma) +{ + if (dying_vma(vma)) + return; + + i915_gem_object_unlock(vma->obj); + i915_gem_object_put(vma->obj); +} + +static bool +mark_free(struct drm_mm_scan *scan, + struct i915_gem_ww_ctx *ww, + struct i915_vma *vma, + unsigned int flags, + struct list_head *unwind) +{ + if (i915_vma_is_pinned(vma)) + return false; + + if (!grab_vma(vma, ww)) + return false; + + list_add(&vma->evict_link, unwind); + return drm_mm_scan_add_block(scan, &vma->node); +} + +static bool defer_evict(struct i915_vma *vma) +{ + if (i915_vma_is_active(vma)) + return true; + + if (i915_vma_is_scanout(vma)) + return true; + + return false; +} + +/** + * i915_gem_evict_something - Evict vmas to make room for binding a new one + * @vm: address space to evict from + * @ww: An optional struct i915_gem_ww_ctx. + * @min_size: size of the desired free space + * @alignment: alignment constraint of the desired free space + * @color: color 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 i915_address_space *vm, + struct i915_gem_ww_ctx *ww, + u64 min_size, u64 alignment, + unsigned long color, + u64 start, u64 end, + unsigned flags) +{ + struct drm_mm_scan scan; + struct list_head eviction_list; + struct i915_vma *vma, *next; + struct drm_mm_node *node; + enum drm_mm_insert_mode mode; + struct i915_vma *active; + struct intel_gt *gt; + int ret; + + lockdep_assert_held(&vm->mutex); + trace_i915_gem_evict(vm, min_size, alignment, flags); + + /* + * The goal is to evict objects and amalgamate space in rough LRU order. + * Since both active and inactive objects reside on the same list, + * in a mix of creation and last scanned order, as we process the list + * we sort it into inactive/active, which keeps the active portion + * in a rough MRU order. + * + * The retirement sequence is thus: + * 1. Inactive objects (already retired, random order) + * 2. Active objects (will stall on unbinding, oldest scanned first) + */ + mode = DRM_MM_INSERT_BEST; + if (flags & PIN_HIGH) + mode = DRM_MM_INSERT_HIGH; + if (flags & PIN_MAPPABLE) + mode = DRM_MM_INSERT_LOW; + drm_mm_scan_init_with_range(&scan, &vm->mm, + min_size, alignment, color, + start, end, mode); + + if (i915_is_ggtt(vm)) { + struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm); + + list_for_each_entry(gt, &ggtt->gt_list, ggtt_link) + intel_gt_retire_requests(gt); + } else { + intel_gt_retire_requests(vm->gt); + } + +search_again: + active = NULL; + INIT_LIST_HEAD(&eviction_list); + list_for_each_entry_safe(vma, next, &vm->bound_list, vm_link) { + if (vma == active) { /* now seen this vma twice */ + if (flags & PIN_NONBLOCK) + break; + + active = ERR_PTR(-EAGAIN); + } + + /* + * We keep this list in a rough least-recently scanned order + * of active elements (inactive elements are cheap to reap). + * New entries are added to the end, and we move anything we + * scan to the end. The assumption is that the working set + * of applications is either steady state (and thanks to the + * userspace bo cache it almost always is) or volatile and + * frequently replaced after a frame, which are self-evicting! + * Given that assumption, the MRU order of the scan list is + * fairly static, and keeping it in least-recently scan order + * is suitable. + * + * To notice when we complete one full cycle, we record the + * first active element seen, before moving it to the tail. + */ + if (active != ERR_PTR(-EAGAIN) && defer_evict(vma)) { + if (!active) + active = vma; + + list_move_tail(&vma->vm_link, &vm->bound_list); + continue; + } + + if (mark_free(&scan, ww, vma, flags, &eviction_list)) + goto found; + } + + /* Nothing found, clean up and bail out! */ + list_for_each_entry_safe(vma, next, &eviction_list, evict_link) { + ret = drm_mm_scan_remove_block(&scan, &vma->node); + BUG_ON(ret); + ungrab_vma(vma); + } + + /* + * Can we unpin some objects such as idle hw contents, + * or pending flips? But since only the GGTT has global entries + * such as scanouts, rinbuffers and contexts, we can skip the + * purge when inspecting per-process local address spaces. + */ + if (!i915_is_ggtt(vm) || flags & PIN_NONBLOCK) + return -ENOSPC; + + /* + * Not everything in the GGTT is tracked via VMA using + * i915_vma_move_to_active(), otherwise we could evict as required + * with minimal stalling. Instead we are forced to idle the GPU and + * explicitly retire outstanding requests which will then remove + * the pinning for active objects such as contexts and ring, + * enabling us to evict them on the next iteration. + * + * To ensure that all user contexts are evictable, we perform + * a switch to the perma-pinned kernel context. This all also gives + * us a termination condition, when the last retired context is + * the kernel's there is no more we can evict. + */ + if (I915_SELFTEST_ONLY(igt_evict_ctl.fail_if_busy)) + return -EBUSY; + + ret = ggtt_flush(vm); + if (ret) + return ret; + + cond_resched(); + + flags |= PIN_NONBLOCK; + goto search_again; + +found: + /* drm_mm doesn't allow any other other operations while + * scanning, therefore store to-be-evicted objects on a + * temporary list and take a reference for all before + * calling unbind (which may remove the active reference + * of any of our objects, thus corrupting the list). + */ + list_for_each_entry_safe(vma, next, &eviction_list, evict_link) { + if (drm_mm_scan_remove_block(&scan, &vma->node)) { + __i915_vma_pin(vma); + } else { + list_del(&vma->evict_link); + ungrab_vma(vma); + } + } + + /* Unbinding will emit any required flushes */ + ret = 0; + list_for_each_entry_safe(vma, next, &eviction_list, evict_link) { + __i915_vma_unpin(vma); + if (ret == 0) + ret = __i915_vma_unbind(vma); + ungrab_vma(vma); + } + + while (ret == 0 && (node = drm_mm_scan_color_evict(&scan))) { + vma = container_of(node, struct i915_vma, node); + + /* If we find any non-objects (!vma), we cannot evict them */ + if (vma->node.color != I915_COLOR_UNEVICTABLE && + grab_vma(vma, ww)) { + ret = __i915_vma_unbind(vma); + ungrab_vma(vma); + } else { + ret = -ENOSPC; + } + } + + return ret; +} + +/** + * i915_gem_evict_for_node - Evict vmas to make room for binding a new one + * @vm: address space to evict from + * @ww: An optional struct i915_gem_ww_ctx. + * @target: range (and color) to evict for + * @flags: additional flags to control the eviction algorithm + * + * This function will try to evict vmas that overlap the target node. + * + * To clarify: This is for freeing up virtual address space, not for freeing + * memory in e.g. the shrinker. + */ +int i915_gem_evict_for_node(struct i915_address_space *vm, + struct i915_gem_ww_ctx *ww, + struct drm_mm_node *target, + unsigned int flags) +{ + LIST_HEAD(eviction_list); + struct drm_mm_node *node; + u64 start = target->start; + u64 end = start + target->size; + struct i915_vma *vma, *next; + int ret = 0; + + lockdep_assert_held(&vm->mutex); + GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE)); + GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE)); + + trace_i915_gem_evict_node(vm, target, flags); + + /* + * Retire before we search the active list. Although we have + * reasonable accuracy in our retirement lists, we may have + * a stray pin (preventing eviction) that can only be resolved by + * retiring. + */ + if (i915_is_ggtt(vm)) { + struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm); + struct intel_gt *gt; + + list_for_each_entry(gt, &ggtt->gt_list, ggtt_link) + intel_gt_retire_requests(gt); + } else { + intel_gt_retire_requests(vm->gt); + } + + if (i915_vm_has_cache_coloring(vm)) { + /* Expand search to cover neighbouring guard pages (or lack!) */ + if (start) + start -= I915_GTT_PAGE_SIZE; + + /* Always look at the page afterwards to avoid the end-of-GTT */ + end += I915_GTT_PAGE_SIZE; + } + GEM_BUG_ON(start >= end); + + drm_mm_for_each_node_in_range(node, &vm->mm, start, end) { + /* If we find any non-objects (!vma), we cannot evict them */ + if (node->color == I915_COLOR_UNEVICTABLE) { + ret = -ENOSPC; + break; + } + + GEM_BUG_ON(!drm_mm_node_allocated(node)); + vma = container_of(node, typeof(*vma), node); + + /* + * If we are using coloring to insert guard pages between + * different cache domains within the address space, we have + * to check whether the objects on either side of our range + * abutt and conflict. If they are in conflict, then we evict + * those as well to make room for our guard pages. + */ + if (i915_vm_has_cache_coloring(vm)) { + if (node->start + node->size == target->start) { + if (node->color == target->color) + continue; + } + if (node->start == target->start + target->size) { + if (node->color == target->color) + continue; + } + } + + if (i915_vma_is_pinned(vma)) { + ret = -ENOSPC; + break; + } + + if (flags & PIN_NONBLOCK && i915_vma_is_active(vma)) { + ret = -ENOSPC; + break; + } + + if (!grab_vma(vma, ww)) { + ret = -ENOSPC; + break; + } + + /* + * Never show fear in the face of dragons! + * + * We cannot directly remove this node from within this + * iterator and as with i915_gem_evict_something() we employ + * the vma pin_count in order to prevent the action of + * unbinding one vma from freeing (by dropping its active + * reference) another in our eviction list. + */ + __i915_vma_pin(vma); + list_add(&vma->evict_link, &eviction_list); + } + + list_for_each_entry_safe(vma, next, &eviction_list, evict_link) { + __i915_vma_unpin(vma); + if (ret == 0) + ret = __i915_vma_unbind(vma); + + ungrab_vma(vma); + } + + return ret; +} + +/** + * i915_gem_evict_vm - Evict all idle vmas from a vm + * @vm: Address space to cleanse + * @ww: An optional struct i915_gem_ww_ctx. If not NULL, i915_gem_evict_vm + * will be able to evict vma's locked by the ww as well. + * @busy_bo: Optional pointer to struct drm_i915_gem_object. If not NULL, then + * in the event i915_gem_evict_vm() is unable to trylock an object for eviction, + * then @busy_bo will point to it. -EBUSY is also returned. The caller must drop + * the vm->mutex, before trying again to acquire the contended lock. The caller + * also owns a reference to the object. + * + * This function evicts all vmas from a vm. + * + * 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, struct i915_gem_ww_ctx *ww, + struct drm_i915_gem_object **busy_bo) +{ + int ret = 0; + + lockdep_assert_held(&vm->mutex); + trace_i915_gem_evict_vm(vm); + + /* Switch back to the default context in order to unpin + * the existing context objects. However, such objects only + * pin themselves inside the global GTT and performing the + * switch otherwise is ineffective. + */ + if (i915_is_ggtt(vm)) { + ret = ggtt_flush(vm); + if (ret) + return ret; + } + + do { + struct i915_vma *vma, *vn; + LIST_HEAD(eviction_list); + LIST_HEAD(locked_eviction_list); + + list_for_each_entry(vma, &vm->bound_list, vm_link) { + if (i915_vma_is_pinned(vma)) + continue; + + /* + * If we already own the lock, trylock fails. In case + * the resv is shared among multiple objects, we still + * need the object ref. + */ + if (!i915_gem_object_get_rcu(vma->obj) || + (ww && (dma_resv_locking_ctx(vma->obj->base.resv) == &ww->ctx))) { + __i915_vma_pin(vma); + list_add(&vma->evict_link, &locked_eviction_list); + continue; + } + + if (!i915_gem_object_trylock(vma->obj, ww)) { + if (busy_bo) { + *busy_bo = vma->obj; /* holds ref */ + ret = -EBUSY; + break; + } + i915_gem_object_put(vma->obj); + continue; + } + + __i915_vma_pin(vma); + list_add(&vma->evict_link, &eviction_list); + } + if (list_empty(&eviction_list) && list_empty(&locked_eviction_list)) + break; + + /* Unbind locked objects first, before unlocking the eviction_list */ + list_for_each_entry_safe(vma, vn, &locked_eviction_list, evict_link) { + __i915_vma_unpin(vma); + + if (ret == 0) { + ret = __i915_vma_unbind(vma); + if (ret != -EINTR) /* "Get me out of here!" */ + ret = 0; + } + if (!dying_vma(vma)) + i915_gem_object_put(vma->obj); + } + + list_for_each_entry_safe(vma, vn, &eviction_list, evict_link) { + __i915_vma_unpin(vma); + if (ret == 0) { + ret = __i915_vma_unbind(vma); + if (ret != -EINTR) /* "Get me out of here!" */ + ret = 0; + } + + i915_gem_object_unlock(vma->obj); + i915_gem_object_put(vma->obj); + } + } while (ret == 0); + + return ret; +} + +#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) +#include "selftests/i915_gem_evict.c" +#endif |