546 lines
16 KiB
C
546 lines
16 KiB
C
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/*
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* Copyright © 2008-2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Eric Anholt <eric@anholt.net>
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* Chris Wilson <chris@chris-wilson.co.uuk>
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*
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*/
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#include "gem/i915_gem_context.h"
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#include "gt/intel_gt.h"
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#include "gt/intel_gt_requests.h"
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#include "i915_drv.h"
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#include "i915_gem_evict.h"
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#include "i915_trace.h"
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I915_SELFTEST_DECLARE(static struct igt_evict_ctl {
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bool fail_if_busy:1;
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} igt_evict_ctl;)
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static bool dying_vma(struct i915_vma *vma)
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{
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return !kref_read(&vma->obj->base.refcount);
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}
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static int ggtt_flush(struct i915_address_space *vm)
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{
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struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
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struct intel_gt *gt;
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int ret = 0;
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list_for_each_entry(gt, &ggtt->gt_list, ggtt_link) {
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/*
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* Not everything in the GGTT is tracked via vma (otherwise we
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* could evict as required with minimal stalling) so we are forced
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* to idle the GPU and explicitly retire outstanding requests in
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* the hopes that we can then remove contexts and the like only
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* bound by their active reference.
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*/
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ret = intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT);
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if (ret)
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return ret;
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}
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return ret;
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}
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static bool grab_vma(struct i915_vma *vma, struct i915_gem_ww_ctx *ww)
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{
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/*
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* We add the extra refcount so the object doesn't drop to zero until
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* after ungrab_vma(), this way trylock is always paired with unlock.
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*/
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if (i915_gem_object_get_rcu(vma->obj)) {
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if (!i915_gem_object_trylock(vma->obj, ww)) {
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i915_gem_object_put(vma->obj);
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return false;
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}
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} else {
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/* Dead objects don't need pins */
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atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
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}
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return true;
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}
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static void ungrab_vma(struct i915_vma *vma)
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{
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if (dying_vma(vma))
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return;
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i915_gem_object_unlock(vma->obj);
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i915_gem_object_put(vma->obj);
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}
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static bool
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mark_free(struct drm_mm_scan *scan,
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struct i915_gem_ww_ctx *ww,
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struct i915_vma *vma,
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unsigned int flags,
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struct list_head *unwind)
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{
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if (i915_vma_is_pinned(vma))
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return false;
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if (!grab_vma(vma, ww))
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return false;
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list_add(&vma->evict_link, unwind);
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return drm_mm_scan_add_block(scan, &vma->node);
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}
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static bool defer_evict(struct i915_vma *vma)
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{
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if (i915_vma_is_active(vma))
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return true;
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if (i915_vma_is_scanout(vma))
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return true;
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return false;
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}
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/**
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* i915_gem_evict_something - Evict vmas to make room for binding a new one
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* @vm: address space to evict from
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* @ww: An optional struct i915_gem_ww_ctx.
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* @min_size: size of the desired free space
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* @alignment: alignment constraint of the desired free space
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* @color: color for the desired space
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* @start: start (inclusive) of the range from which to evict objects
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* @end: end (exclusive) of the range from which to evict objects
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* @flags: additional flags to control the eviction algorithm
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*
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* This function will try to evict vmas until a free space satisfying the
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* requirements is found. Callers must check first whether any such hole exists
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* already before calling this function.
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*
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* This function is used by the object/vma binding code.
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*
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* Since this function is only used to free up virtual address space it only
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* ignores pinned vmas, and not object where the backing storage itself is
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* pinned. Hence obj->pages_pin_count does not protect against eviction.
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*
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* To clarify: This is for freeing up virtual address space, not for freeing
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* memory in e.g. the shrinker.
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*/
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int
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i915_gem_evict_something(struct i915_address_space *vm,
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struct i915_gem_ww_ctx *ww,
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u64 min_size, u64 alignment,
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unsigned long color,
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u64 start, u64 end,
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unsigned flags)
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{
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struct drm_mm_scan scan;
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struct list_head eviction_list;
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struct i915_vma *vma, *next;
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struct drm_mm_node *node;
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enum drm_mm_insert_mode mode;
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struct i915_vma *active;
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struct intel_gt *gt;
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int ret;
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lockdep_assert_held(&vm->mutex);
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trace_i915_gem_evict(vm, min_size, alignment, flags);
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/*
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* The goal is to evict objects and amalgamate space in rough LRU order.
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* Since both active and inactive objects reside on the same list,
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* in a mix of creation and last scanned order, as we process the list
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* we sort it into inactive/active, which keeps the active portion
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* in a rough MRU order.
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*
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* The retirement sequence is thus:
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* 1. Inactive objects (already retired, random order)
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* 2. Active objects (will stall on unbinding, oldest scanned first)
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*/
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mode = DRM_MM_INSERT_BEST;
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if (flags & PIN_HIGH)
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mode = DRM_MM_INSERT_HIGH;
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if (flags & PIN_MAPPABLE)
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mode = DRM_MM_INSERT_LOW;
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drm_mm_scan_init_with_range(&scan, &vm->mm,
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min_size, alignment, color,
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start, end, mode);
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if (i915_is_ggtt(vm)) {
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struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
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list_for_each_entry(gt, &ggtt->gt_list, ggtt_link)
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intel_gt_retire_requests(gt);
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} else {
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intel_gt_retire_requests(vm->gt);
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}
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search_again:
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active = NULL;
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INIT_LIST_HEAD(&eviction_list);
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list_for_each_entry_safe(vma, next, &vm->bound_list, vm_link) {
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if (vma == active) { /* now seen this vma twice */
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if (flags & PIN_NONBLOCK)
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break;
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active = ERR_PTR(-EAGAIN);
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}
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/*
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* We keep this list in a rough least-recently scanned order
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* of active elements (inactive elements are cheap to reap).
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* New entries are added to the end, and we move anything we
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* scan to the end. The assumption is that the working set
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* of applications is either steady state (and thanks to the
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* userspace bo cache it almost always is) or volatile and
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* frequently replaced after a frame, which are self-evicting!
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* Given that assumption, the MRU order of the scan list is
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* fairly static, and keeping it in least-recently scan order
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* is suitable.
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*
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* To notice when we complete one full cycle, we record the
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* first active element seen, before moving it to the tail.
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*/
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if (active != ERR_PTR(-EAGAIN) && defer_evict(vma)) {
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if (!active)
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active = vma;
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list_move_tail(&vma->vm_link, &vm->bound_list);
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continue;
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}
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if (mark_free(&scan, ww, vma, flags, &eviction_list))
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goto found;
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}
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/* Nothing found, clean up and bail out! */
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list_for_each_entry_safe(vma, next, &eviction_list, evict_link) {
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ret = drm_mm_scan_remove_block(&scan, &vma->node);
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BUG_ON(ret);
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ungrab_vma(vma);
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}
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/*
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* Can we unpin some objects such as idle hw contents,
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* or pending flips? But since only the GGTT has global entries
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* such as scanouts, rinbuffers and contexts, we can skip the
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* purge when inspecting per-process local address spaces.
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*/
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if (!i915_is_ggtt(vm) || flags & PIN_NONBLOCK)
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return -ENOSPC;
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/*
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* Not everything in the GGTT is tracked via VMA using
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* i915_vma_move_to_active(), otherwise we could evict as required
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* with minimal stalling. Instead we are forced to idle the GPU and
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* explicitly retire outstanding requests which will then remove
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* the pinning for active objects such as contexts and ring,
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* enabling us to evict them on the next iteration.
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*
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* To ensure that all user contexts are evictable, we perform
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* a switch to the perma-pinned kernel context. This all also gives
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* us a termination condition, when the last retired context is
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* the kernel's there is no more we can evict.
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*/
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if (I915_SELFTEST_ONLY(igt_evict_ctl.fail_if_busy))
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return -EBUSY;
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ret = ggtt_flush(vm);
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if (ret)
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return ret;
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cond_resched();
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flags |= PIN_NONBLOCK;
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goto search_again;
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found:
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/* drm_mm doesn't allow any other other operations while
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* scanning, therefore store to-be-evicted objects on a
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* temporary list and take a reference for all before
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* calling unbind (which may remove the active reference
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* of any of our objects, thus corrupting the list).
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*/
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list_for_each_entry_safe(vma, next, &eviction_list, evict_link) {
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if (drm_mm_scan_remove_block(&scan, &vma->node)) {
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__i915_vma_pin(vma);
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} else {
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list_del(&vma->evict_link);
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ungrab_vma(vma);
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}
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}
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/* Unbinding will emit any required flushes */
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ret = 0;
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list_for_each_entry_safe(vma, next, &eviction_list, evict_link) {
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__i915_vma_unpin(vma);
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if (ret == 0)
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ret = __i915_vma_unbind(vma);
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ungrab_vma(vma);
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}
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while (ret == 0 && (node = drm_mm_scan_color_evict(&scan))) {
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vma = container_of(node, struct i915_vma, node);
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/* If we find any non-objects (!vma), we cannot evict them */
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if (vma->node.color != I915_COLOR_UNEVICTABLE &&
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grab_vma(vma, ww)) {
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ret = __i915_vma_unbind(vma);
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ungrab_vma(vma);
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} else {
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ret = -ENOSPC;
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}
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}
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return ret;
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}
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/**
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* i915_gem_evict_for_node - Evict vmas to make room for binding a new one
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* @vm: address space to evict from
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* @ww: An optional struct i915_gem_ww_ctx.
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* @target: range (and color) to evict for
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* @flags: additional flags to control the eviction algorithm
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*
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* This function will try to evict vmas that overlap the target node.
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*
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* To clarify: This is for freeing up virtual address space, not for freeing
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* memory in e.g. the shrinker.
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*/
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int i915_gem_evict_for_node(struct i915_address_space *vm,
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struct i915_gem_ww_ctx *ww,
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struct drm_mm_node *target,
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unsigned int flags)
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{
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LIST_HEAD(eviction_list);
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struct drm_mm_node *node;
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u64 start = target->start;
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u64 end = start + target->size;
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struct i915_vma *vma, *next;
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int ret = 0;
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lockdep_assert_held(&vm->mutex);
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GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE));
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GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE));
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trace_i915_gem_evict_node(vm, target, flags);
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/*
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* Retire before we search the active list. Although we have
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* reasonable accuracy in our retirement lists, we may have
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* a stray pin (preventing eviction) that can only be resolved by
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* retiring.
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*/
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if (i915_is_ggtt(vm)) {
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struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
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struct intel_gt *gt;
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list_for_each_entry(gt, &ggtt->gt_list, ggtt_link)
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intel_gt_retire_requests(gt);
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} else {
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intel_gt_retire_requests(vm->gt);
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}
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|
||
|
|
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
|