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![Chris Wilson](/assets/img/avatar_default.png)
We now do the page pin count upfront in vma_get_pages/vma_put_pages, so that we do the allocations before we enter the vm->mutex. Our vma page references we are tracked in vma->pages_count and the extra obj->pages_pin_count being performed later in i915_vma_insert and i915_vma_remove is redundant, and worse throws off the shrinker's logic on when it can free an object by unbinding it. Reported-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Reported-by: Matthew Auld <matthew.auld@intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191015100155.10376-1-chris@chris-wilson.co.uk
1254 lines
31 KiB
C
1254 lines
31 KiB
C
/*
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* Copyright © 2016 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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*/
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#include <linux/sched/mm.h>
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#include <drm/drm_gem.h>
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#include "display/intel_frontbuffer.h"
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#include "gt/intel_engine.h"
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#include "gt/intel_gt.h"
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#include "i915_drv.h"
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#include "i915_globals.h"
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#include "i915_sw_fence_work.h"
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#include "i915_trace.h"
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#include "i915_vma.h"
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static struct i915_global_vma {
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struct i915_global base;
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struct kmem_cache *slab_vmas;
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} global;
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struct i915_vma *i915_vma_alloc(void)
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{
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return kmem_cache_zalloc(global.slab_vmas, GFP_KERNEL);
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}
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void i915_vma_free(struct i915_vma *vma)
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{
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return kmem_cache_free(global.slab_vmas, vma);
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}
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#if IS_ENABLED(CONFIG_DRM_I915_ERRLOG_GEM) && IS_ENABLED(CONFIG_DRM_DEBUG_MM)
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#include <linux/stackdepot.h>
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static void vma_print_allocator(struct i915_vma *vma, const char *reason)
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{
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unsigned long *entries;
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unsigned int nr_entries;
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char buf[512];
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if (!vma->node.stack) {
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DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: unknown owner\n",
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vma->node.start, vma->node.size, reason);
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return;
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}
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nr_entries = stack_depot_fetch(vma->node.stack, &entries);
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stack_trace_snprint(buf, sizeof(buf), entries, nr_entries, 0);
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DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: inserted at %s\n",
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vma->node.start, vma->node.size, reason, buf);
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}
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#else
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static void vma_print_allocator(struct i915_vma *vma, const char *reason)
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{
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}
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#endif
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static inline struct i915_vma *active_to_vma(struct i915_active *ref)
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{
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return container_of(ref, typeof(struct i915_vma), active);
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}
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static int __i915_vma_active(struct i915_active *ref)
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{
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return i915_vma_tryget(active_to_vma(ref)) ? 0 : -ENOENT;
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}
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__i915_active_call
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static void __i915_vma_retire(struct i915_active *ref)
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{
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i915_vma_put(active_to_vma(ref));
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}
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static struct i915_vma *
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vma_create(struct drm_i915_gem_object *obj,
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struct i915_address_space *vm,
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const struct i915_ggtt_view *view)
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{
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struct i915_vma *vma;
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struct rb_node *rb, **p;
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/* The aliasing_ppgtt should never be used directly! */
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GEM_BUG_ON(vm == &vm->i915->ggtt.alias->vm);
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vma = i915_vma_alloc();
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if (vma == NULL)
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return ERR_PTR(-ENOMEM);
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mutex_init(&vma->pages_mutex);
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vma->vm = i915_vm_get(vm);
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vma->ops = &vm->vma_ops;
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vma->obj = obj;
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vma->resv = obj->base.resv;
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vma->size = obj->base.size;
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vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
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i915_active_init(&vma->active, __i915_vma_active, __i915_vma_retire);
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/* Declare ourselves safe for use inside shrinkers */
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if (IS_ENABLED(CONFIG_LOCKDEP)) {
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fs_reclaim_acquire(GFP_KERNEL);
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might_lock(&vma->active.mutex);
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fs_reclaim_release(GFP_KERNEL);
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}
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INIT_LIST_HEAD(&vma->closed_link);
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if (view && view->type != I915_GGTT_VIEW_NORMAL) {
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vma->ggtt_view = *view;
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if (view->type == I915_GGTT_VIEW_PARTIAL) {
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GEM_BUG_ON(range_overflows_t(u64,
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view->partial.offset,
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view->partial.size,
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obj->base.size >> PAGE_SHIFT));
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vma->size = view->partial.size;
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vma->size <<= PAGE_SHIFT;
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GEM_BUG_ON(vma->size > obj->base.size);
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} else if (view->type == I915_GGTT_VIEW_ROTATED) {
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vma->size = intel_rotation_info_size(&view->rotated);
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vma->size <<= PAGE_SHIFT;
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} else if (view->type == I915_GGTT_VIEW_REMAPPED) {
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vma->size = intel_remapped_info_size(&view->remapped);
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vma->size <<= PAGE_SHIFT;
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}
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}
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if (unlikely(vma->size > vm->total))
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goto err_vma;
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GEM_BUG_ON(!IS_ALIGNED(vma->size, I915_GTT_PAGE_SIZE));
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if (i915_is_ggtt(vm)) {
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if (unlikely(overflows_type(vma->size, u32)))
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goto err_vma;
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vma->fence_size = i915_gem_fence_size(vm->i915, vma->size,
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i915_gem_object_get_tiling(obj),
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i915_gem_object_get_stride(obj));
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if (unlikely(vma->fence_size < vma->size || /* overflow */
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vma->fence_size > vm->total))
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goto err_vma;
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GEM_BUG_ON(!IS_ALIGNED(vma->fence_size, I915_GTT_MIN_ALIGNMENT));
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vma->fence_alignment = i915_gem_fence_alignment(vm->i915, vma->size,
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i915_gem_object_get_tiling(obj),
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i915_gem_object_get_stride(obj));
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GEM_BUG_ON(!is_power_of_2(vma->fence_alignment));
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__set_bit(I915_VMA_GGTT_BIT, __i915_vma_flags(vma));
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}
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spin_lock(&obj->vma.lock);
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rb = NULL;
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p = &obj->vma.tree.rb_node;
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while (*p) {
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struct i915_vma *pos;
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long cmp;
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rb = *p;
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pos = rb_entry(rb, struct i915_vma, obj_node);
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/*
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* If the view already exists in the tree, another thread
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* already created a matching vma, so return the older instance
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* and dispose of ours.
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*/
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cmp = i915_vma_compare(pos, vm, view);
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if (cmp == 0) {
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spin_unlock(&obj->vma.lock);
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i915_vma_free(vma);
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return pos;
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}
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if (cmp < 0)
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p = &rb->rb_right;
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else
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p = &rb->rb_left;
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}
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rb_link_node(&vma->obj_node, rb, p);
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rb_insert_color(&vma->obj_node, &obj->vma.tree);
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if (i915_vma_is_ggtt(vma))
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/*
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* We put the GGTT vma at the start of the vma-list, followed
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* by the ppGGTT vma. This allows us to break early when
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* iterating over only the GGTT vma for an object, see
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* for_each_ggtt_vma()
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*/
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list_add(&vma->obj_link, &obj->vma.list);
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else
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list_add_tail(&vma->obj_link, &obj->vma.list);
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spin_unlock(&obj->vma.lock);
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return vma;
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err_vma:
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i915_vma_free(vma);
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return ERR_PTR(-E2BIG);
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}
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static struct i915_vma *
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vma_lookup(struct drm_i915_gem_object *obj,
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struct i915_address_space *vm,
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const struct i915_ggtt_view *view)
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{
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struct rb_node *rb;
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rb = obj->vma.tree.rb_node;
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while (rb) {
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struct i915_vma *vma = rb_entry(rb, struct i915_vma, obj_node);
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long cmp;
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cmp = i915_vma_compare(vma, vm, view);
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if (cmp == 0)
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return vma;
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if (cmp < 0)
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rb = rb->rb_right;
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else
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rb = rb->rb_left;
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}
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return NULL;
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}
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/**
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* i915_vma_instance - return the singleton instance of the VMA
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* @obj: parent &struct drm_i915_gem_object to be mapped
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* @vm: address space in which the mapping is located
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* @view: additional mapping requirements
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*
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* i915_vma_instance() looks up an existing VMA of the @obj in the @vm with
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* the same @view characteristics. If a match is not found, one is created.
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* Once created, the VMA is kept until either the object is freed, or the
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* address space is closed.
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*
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* Returns the vma, or an error pointer.
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*/
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struct i915_vma *
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i915_vma_instance(struct drm_i915_gem_object *obj,
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struct i915_address_space *vm,
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const struct i915_ggtt_view *view)
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{
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struct i915_vma *vma;
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GEM_BUG_ON(view && !i915_is_ggtt(vm));
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GEM_BUG_ON(!atomic_read(&vm->open));
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spin_lock(&obj->vma.lock);
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vma = vma_lookup(obj, vm, view);
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spin_unlock(&obj->vma.lock);
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/* vma_create() will resolve the race if another creates the vma */
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if (unlikely(!vma))
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vma = vma_create(obj, vm, view);
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GEM_BUG_ON(!IS_ERR(vma) && i915_vma_compare(vma, vm, view));
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return vma;
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}
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struct i915_vma_work {
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struct dma_fence_work base;
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struct i915_vma *vma;
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enum i915_cache_level cache_level;
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unsigned int flags;
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};
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static int __vma_bind(struct dma_fence_work *work)
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{
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struct i915_vma_work *vw = container_of(work, typeof(*vw), base);
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struct i915_vma *vma = vw->vma;
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int err;
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err = vma->ops->bind_vma(vma, vw->cache_level, vw->flags);
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if (err)
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atomic_or(I915_VMA_ERROR, &vma->flags);
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if (vma->obj)
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__i915_gem_object_unpin_pages(vma->obj);
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return err;
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}
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static const struct dma_fence_work_ops bind_ops = {
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.name = "bind",
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.work = __vma_bind,
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};
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struct i915_vma_work *i915_vma_work(void)
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{
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struct i915_vma_work *vw;
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vw = kzalloc(sizeof(*vw), GFP_KERNEL);
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if (!vw)
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return NULL;
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dma_fence_work_init(&vw->base, &bind_ops);
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vw->base.dma.error = -EAGAIN; /* disable the worker by default */
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return vw;
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}
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/**
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* i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space.
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* @vma: VMA to map
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* @cache_level: mapping cache level
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* @flags: flags like global or local mapping
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* @work: preallocated worker for allocating and binding the PTE
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*
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* DMA addresses are taken from the scatter-gather table of this object (or of
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* this VMA in case of non-default GGTT views) and PTE entries set up.
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* Note that DMA addresses are also the only part of the SG table we care about.
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*/
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int i915_vma_bind(struct i915_vma *vma,
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enum i915_cache_level cache_level,
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u32 flags,
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struct i915_vma_work *work)
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{
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u32 bind_flags;
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u32 vma_flags;
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int ret;
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GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
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GEM_BUG_ON(vma->size > vma->node.size);
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if (GEM_DEBUG_WARN_ON(range_overflows(vma->node.start,
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vma->node.size,
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vma->vm->total)))
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return -ENODEV;
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if (GEM_DEBUG_WARN_ON(!flags))
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return -EINVAL;
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bind_flags = flags;
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bind_flags &= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
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vma_flags = atomic_read(&vma->flags);
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vma_flags &= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
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if (flags & PIN_UPDATE)
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bind_flags |= vma_flags;
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else
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bind_flags &= ~vma_flags;
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if (bind_flags == 0)
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return 0;
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GEM_BUG_ON(!vma->pages);
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trace_i915_vma_bind(vma, bind_flags);
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if (work && (bind_flags & ~vma_flags) & vma->vm->bind_async_flags) {
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work->vma = vma;
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work->cache_level = cache_level;
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work->flags = bind_flags | I915_VMA_ALLOC;
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/*
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* Note we only want to chain up to the migration fence on
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* the pages (not the object itself). As we don't track that,
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* yet, we have to use the exclusive fence instead.
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*
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* Also note that we do not want to track the async vma as
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* part of the obj->resv->excl_fence as it only affects
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* execution and not content or object's backing store lifetime.
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*/
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GEM_BUG_ON(i915_active_has_exclusive(&vma->active));
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i915_active_set_exclusive(&vma->active, &work->base.dma);
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work->base.dma.error = 0; /* enable the queue_work() */
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if (vma->obj)
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__i915_gem_object_pin_pages(vma->obj);
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} else {
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GEM_BUG_ON((bind_flags & ~vma_flags) & vma->vm->bind_async_flags);
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ret = vma->ops->bind_vma(vma, cache_level, bind_flags);
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if (ret)
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return ret;
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}
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atomic_or(bind_flags, &vma->flags);
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return 0;
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}
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|
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void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
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{
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void __iomem *ptr;
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int err;
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/* Access through the GTT requires the device to be awake. */
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assert_rpm_wakelock_held(&vma->vm->i915->runtime_pm);
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if (GEM_WARN_ON(!i915_vma_is_map_and_fenceable(vma))) {
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err = -ENODEV;
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goto err;
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}
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GEM_BUG_ON(!i915_vma_is_ggtt(vma));
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GEM_BUG_ON(!i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND));
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ptr = READ_ONCE(vma->iomap);
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if (ptr == NULL) {
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ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->iomap,
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vma->node.start,
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vma->node.size);
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if (ptr == NULL) {
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err = -ENOMEM;
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goto err;
|
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}
|
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|
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if (unlikely(cmpxchg(&vma->iomap, NULL, ptr))) {
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io_mapping_unmap(ptr);
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ptr = vma->iomap;
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}
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}
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|
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__i915_vma_pin(vma);
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|
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err = i915_vma_pin_fence(vma);
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if (err)
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goto err_unpin;
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|
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i915_vma_set_ggtt_write(vma);
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return ptr;
|
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|
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err_unpin:
|
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__i915_vma_unpin(vma);
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err:
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return IO_ERR_PTR(err);
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}
|
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|
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void i915_vma_flush_writes(struct i915_vma *vma)
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{
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if (i915_vma_unset_ggtt_write(vma))
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intel_gt_flush_ggtt_writes(vma->vm->gt);
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}
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|
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void i915_vma_unpin_iomap(struct i915_vma *vma)
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{
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GEM_BUG_ON(vma->iomap == NULL);
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|
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i915_vma_flush_writes(vma);
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|
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i915_vma_unpin_fence(vma);
|
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i915_vma_unpin(vma);
|
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}
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|
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void i915_vma_unpin_and_release(struct i915_vma **p_vma, unsigned int flags)
|
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{
|
|
struct i915_vma *vma;
|
|
struct drm_i915_gem_object *obj;
|
|
|
|
vma = fetch_and_zero(p_vma);
|
|
if (!vma)
|
|
return;
|
|
|
|
obj = vma->obj;
|
|
GEM_BUG_ON(!obj);
|
|
|
|
i915_vma_unpin(vma);
|
|
i915_vma_close(vma);
|
|
|
|
if (flags & I915_VMA_RELEASE_MAP)
|
|
i915_gem_object_unpin_map(obj);
|
|
|
|
i915_gem_object_put(obj);
|
|
}
|
|
|
|
bool i915_vma_misplaced(const struct i915_vma *vma,
|
|
u64 size, u64 alignment, u64 flags)
|
|
{
|
|
if (!drm_mm_node_allocated(&vma->node))
|
|
return false;
|
|
|
|
if (test_bit(I915_VMA_ERROR_BIT, __i915_vma_flags(vma)))
|
|
return true;
|
|
|
|
if (vma->node.size < size)
|
|
return true;
|
|
|
|
GEM_BUG_ON(alignment && !is_power_of_2(alignment));
|
|
if (alignment && !IS_ALIGNED(vma->node.start, alignment))
|
|
return true;
|
|
|
|
if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma))
|
|
return true;
|
|
|
|
if (flags & PIN_OFFSET_BIAS &&
|
|
vma->node.start < (flags & PIN_OFFSET_MASK))
|
|
return true;
|
|
|
|
if (flags & PIN_OFFSET_FIXED &&
|
|
vma->node.start != (flags & PIN_OFFSET_MASK))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
|
|
{
|
|
bool mappable, fenceable;
|
|
|
|
GEM_BUG_ON(!i915_vma_is_ggtt(vma));
|
|
GEM_BUG_ON(!vma->fence_size);
|
|
|
|
fenceable = (vma->node.size >= vma->fence_size &&
|
|
IS_ALIGNED(vma->node.start, vma->fence_alignment));
|
|
|
|
mappable = vma->node.start + vma->fence_size <= i915_vm_to_ggtt(vma->vm)->mappable_end;
|
|
|
|
if (mappable && fenceable)
|
|
set_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
|
|
else
|
|
clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
|
|
}
|
|
|
|
bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long color)
|
|
{
|
|
struct drm_mm_node *node = &vma->node;
|
|
struct drm_mm_node *other;
|
|
|
|
/*
|
|
* On some machines we have to be careful when putting differing types
|
|
* of snoopable memory together to avoid the prefetcher crossing memory
|
|
* domains and dying. During vm initialisation, we decide whether or not
|
|
* these constraints apply and set the drm_mm.color_adjust
|
|
* appropriately.
|
|
*/
|
|
if (!i915_vm_has_cache_coloring(vma->vm))
|
|
return true;
|
|
|
|
/* Only valid to be called on an already inserted vma */
|
|
GEM_BUG_ON(!drm_mm_node_allocated(node));
|
|
GEM_BUG_ON(list_empty(&node->node_list));
|
|
|
|
other = list_prev_entry(node, node_list);
|
|
if (i915_node_color_differs(other, color) &&
|
|
!drm_mm_hole_follows(other))
|
|
return false;
|
|
|
|
other = list_next_entry(node, node_list);
|
|
if (i915_node_color_differs(other, color) &&
|
|
!drm_mm_hole_follows(node))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void assert_bind_count(const struct drm_i915_gem_object *obj)
|
|
{
|
|
/*
|
|
* Combine the assertion that the object is bound and that we have
|
|
* pinned its pages. But we should never have bound the object
|
|
* more than we have pinned its pages. (For complete accuracy, we
|
|
* assume that no else is pinning the pages, but as a rough assertion
|
|
* that we will not run into problems later, this will do!)
|
|
*/
|
|
GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < atomic_read(&obj->bind_count));
|
|
}
|
|
|
|
/**
|
|
* i915_vma_insert - finds a slot for the vma in its address space
|
|
* @vma: the vma
|
|
* @size: requested size in bytes (can be larger than the VMA)
|
|
* @alignment: required alignment
|
|
* @flags: mask of PIN_* flags to use
|
|
*
|
|
* First we try to allocate some free space that meets the requirements for
|
|
* the VMA. Failiing that, if the flags permit, it will evict an old VMA,
|
|
* preferrably the oldest idle entry to make room for the new VMA.
|
|
*
|
|
* Returns:
|
|
* 0 on success, negative error code otherwise.
|
|
*/
|
|
static int
|
|
i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
|
|
{
|
|
unsigned long color;
|
|
u64 start, end;
|
|
int ret;
|
|
|
|
GEM_BUG_ON(i915_vma_is_closed(vma));
|
|
GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
|
|
GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
|
|
|
|
size = max(size, vma->size);
|
|
alignment = max(alignment, vma->display_alignment);
|
|
if (flags & PIN_MAPPABLE) {
|
|
size = max_t(typeof(size), size, vma->fence_size);
|
|
alignment = max_t(typeof(alignment),
|
|
alignment, vma->fence_alignment);
|
|
}
|
|
|
|
GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE));
|
|
GEM_BUG_ON(!IS_ALIGNED(alignment, I915_GTT_MIN_ALIGNMENT));
|
|
GEM_BUG_ON(!is_power_of_2(alignment));
|
|
|
|
start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
|
|
GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE));
|
|
|
|
end = vma->vm->total;
|
|
if (flags & PIN_MAPPABLE)
|
|
end = min_t(u64, end, i915_vm_to_ggtt(vma->vm)->mappable_end);
|
|
if (flags & PIN_ZONE_4G)
|
|
end = min_t(u64, end, (1ULL << 32) - I915_GTT_PAGE_SIZE);
|
|
GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE));
|
|
|
|
/* If binding the object/GGTT view requires more space than the entire
|
|
* aperture has, reject it early before evicting everything in a vain
|
|
* attempt to find space.
|
|
*/
|
|
if (size > end) {
|
|
DRM_DEBUG("Attempting to bind an object larger than the aperture: request=%llu > %s aperture=%llu\n",
|
|
size, flags & PIN_MAPPABLE ? "mappable" : "total",
|
|
end);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
color = 0;
|
|
if (vma->obj && i915_vm_has_cache_coloring(vma->vm))
|
|
color = vma->obj->cache_level;
|
|
|
|
if (flags & PIN_OFFSET_FIXED) {
|
|
u64 offset = flags & PIN_OFFSET_MASK;
|
|
if (!IS_ALIGNED(offset, alignment) ||
|
|
range_overflows(offset, size, end))
|
|
return -EINVAL;
|
|
|
|
ret = i915_gem_gtt_reserve(vma->vm, &vma->node,
|
|
size, offset, color,
|
|
flags);
|
|
if (ret)
|
|
return ret;
|
|
} else {
|
|
/*
|
|
* We only support huge gtt pages through the 48b PPGTT,
|
|
* however we also don't want to force any alignment for
|
|
* objects which need to be tightly packed into the low 32bits.
|
|
*
|
|
* Note that we assume that GGTT are limited to 4GiB for the
|
|
* forseeable future. See also i915_ggtt_offset().
|
|
*/
|
|
if (upper_32_bits(end - 1) &&
|
|
vma->page_sizes.sg > I915_GTT_PAGE_SIZE) {
|
|
/*
|
|
* We can't mix 64K and 4K PTEs in the same page-table
|
|
* (2M block), and so to avoid the ugliness and
|
|
* complexity of coloring we opt for just aligning 64K
|
|
* objects to 2M.
|
|
*/
|
|
u64 page_alignment =
|
|
rounddown_pow_of_two(vma->page_sizes.sg |
|
|
I915_GTT_PAGE_SIZE_2M);
|
|
|
|
/*
|
|
* Check we don't expand for the limited Global GTT
|
|
* (mappable aperture is even more precious!). This
|
|
* also checks that we exclude the aliasing-ppgtt.
|
|
*/
|
|
GEM_BUG_ON(i915_vma_is_ggtt(vma));
|
|
|
|
alignment = max(alignment, page_alignment);
|
|
|
|
if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K)
|
|
size = round_up(size, I915_GTT_PAGE_SIZE_2M);
|
|
}
|
|
|
|
ret = i915_gem_gtt_insert(vma->vm, &vma->node,
|
|
size, alignment, color,
|
|
start, end, flags);
|
|
if (ret)
|
|
return ret;
|
|
|
|
GEM_BUG_ON(vma->node.start < start);
|
|
GEM_BUG_ON(vma->node.start + vma->node.size > end);
|
|
}
|
|
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
|
|
GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, color));
|
|
|
|
list_add_tail(&vma->vm_link, &vma->vm->bound_list);
|
|
|
|
if (vma->obj) {
|
|
atomic_inc(&vma->obj->bind_count);
|
|
assert_bind_count(vma->obj);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
i915_vma_remove(struct i915_vma *vma)
|
|
{
|
|
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
|
|
GEM_BUG_ON(i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
|
|
|
|
list_del(&vma->vm_link);
|
|
|
|
/*
|
|
* Since the unbound list is global, only move to that list if
|
|
* no more VMAs exist.
|
|
*/
|
|
if (vma->obj) {
|
|
struct drm_i915_gem_object *obj = vma->obj;
|
|
|
|
/*
|
|
* And finally now the object is completely decoupled from this
|
|
* vma, we can drop its hold on the backing storage and allow
|
|
* it to be reaped by the shrinker.
|
|
*/
|
|
atomic_dec(&obj->bind_count);
|
|
assert_bind_count(obj);
|
|
}
|
|
|
|
drm_mm_remove_node(&vma->node);
|
|
}
|
|
|
|
static bool try_qad_pin(struct i915_vma *vma, unsigned int flags)
|
|
{
|
|
unsigned int bound;
|
|
bool pinned = true;
|
|
|
|
bound = atomic_read(&vma->flags);
|
|
do {
|
|
if (unlikely(flags & ~bound))
|
|
return false;
|
|
|
|
if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR)))
|
|
return false;
|
|
|
|
if (!(bound & I915_VMA_PIN_MASK))
|
|
goto unpinned;
|
|
|
|
GEM_BUG_ON(((bound + 1) & I915_VMA_PIN_MASK) == 0);
|
|
} while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
|
|
|
|
return true;
|
|
|
|
unpinned:
|
|
/*
|
|
* If pin_count==0, but we are bound, check under the lock to avoid
|
|
* racing with a concurrent i915_vma_unbind().
|
|
*/
|
|
mutex_lock(&vma->vm->mutex);
|
|
do {
|
|
if (unlikely(bound & (I915_VMA_OVERFLOW | I915_VMA_ERROR))) {
|
|
pinned = false;
|
|
break;
|
|
}
|
|
|
|
if (unlikely(flags & ~bound)) {
|
|
pinned = false;
|
|
break;
|
|
}
|
|
} while (!atomic_try_cmpxchg(&vma->flags, &bound, bound + 1));
|
|
mutex_unlock(&vma->vm->mutex);
|
|
|
|
return pinned;
|
|
}
|
|
|
|
static int vma_get_pages(struct i915_vma *vma)
|
|
{
|
|
int err = 0;
|
|
|
|
if (atomic_add_unless(&vma->pages_count, 1, 0))
|
|
return 0;
|
|
|
|
/* Allocations ahoy! */
|
|
if (mutex_lock_interruptible(&vma->pages_mutex))
|
|
return -EINTR;
|
|
|
|
if (!atomic_read(&vma->pages_count)) {
|
|
if (vma->obj) {
|
|
err = i915_gem_object_pin_pages(vma->obj);
|
|
if (err)
|
|
goto unlock;
|
|
}
|
|
|
|
err = vma->ops->set_pages(vma);
|
|
if (err) {
|
|
if (vma->obj)
|
|
i915_gem_object_unpin_pages(vma->obj);
|
|
goto unlock;
|
|
}
|
|
}
|
|
atomic_inc(&vma->pages_count);
|
|
|
|
unlock:
|
|
mutex_unlock(&vma->pages_mutex);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __vma_put_pages(struct i915_vma *vma, unsigned int count)
|
|
{
|
|
/* We allocate under vma_get_pages, so beware the shrinker */
|
|
mutex_lock_nested(&vma->pages_mutex, SINGLE_DEPTH_NESTING);
|
|
GEM_BUG_ON(atomic_read(&vma->pages_count) < count);
|
|
if (atomic_sub_return(count, &vma->pages_count) == 0) {
|
|
vma->ops->clear_pages(vma);
|
|
GEM_BUG_ON(vma->pages);
|
|
if (vma->obj)
|
|
i915_gem_object_unpin_pages(vma->obj);
|
|
}
|
|
mutex_unlock(&vma->pages_mutex);
|
|
}
|
|
|
|
static void vma_put_pages(struct i915_vma *vma)
|
|
{
|
|
if (atomic_add_unless(&vma->pages_count, -1, 1))
|
|
return;
|
|
|
|
__vma_put_pages(vma, 1);
|
|
}
|
|
|
|
static void vma_unbind_pages(struct i915_vma *vma)
|
|
{
|
|
unsigned int count;
|
|
|
|
lockdep_assert_held(&vma->vm->mutex);
|
|
|
|
/* The upper portion of pages_count is the number of bindings */
|
|
count = atomic_read(&vma->pages_count);
|
|
count >>= I915_VMA_PAGES_BIAS;
|
|
GEM_BUG_ON(!count);
|
|
|
|
__vma_put_pages(vma, count | count << I915_VMA_PAGES_BIAS);
|
|
}
|
|
|
|
int i915_vma_pin(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
|
|
{
|
|
struct i915_vma_work *work = NULL;
|
|
unsigned int bound;
|
|
int err;
|
|
|
|
BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND);
|
|
BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);
|
|
|
|
GEM_BUG_ON(flags & PIN_UPDATE);
|
|
GEM_BUG_ON(!(flags & (PIN_USER | PIN_GLOBAL)));
|
|
|
|
/* First try and grab the pin without rebinding the vma */
|
|
if (try_qad_pin(vma, flags & I915_VMA_BIND_MASK))
|
|
return 0;
|
|
|
|
err = vma_get_pages(vma);
|
|
if (err)
|
|
return err;
|
|
|
|
if (flags & vma->vm->bind_async_flags) {
|
|
work = i915_vma_work();
|
|
if (!work) {
|
|
err = -ENOMEM;
|
|
goto err_pages;
|
|
}
|
|
}
|
|
|
|
/* No more allocations allowed once we hold vm->mutex */
|
|
err = mutex_lock_interruptible(&vma->vm->mutex);
|
|
if (err)
|
|
goto err_fence;
|
|
|
|
bound = atomic_read(&vma->flags);
|
|
if (unlikely(bound & I915_VMA_ERROR)) {
|
|
err = -ENOMEM;
|
|
goto err_unlock;
|
|
}
|
|
|
|
if (unlikely(!((bound + 1) & I915_VMA_PIN_MASK))) {
|
|
err = -EAGAIN; /* pins are meant to be fairly temporary */
|
|
goto err_unlock;
|
|
}
|
|
|
|
if (unlikely(!(flags & ~bound & I915_VMA_BIND_MASK))) {
|
|
__i915_vma_pin(vma);
|
|
goto err_unlock;
|
|
}
|
|
|
|
err = i915_active_acquire(&vma->active);
|
|
if (err)
|
|
goto err_unlock;
|
|
|
|
if (!(bound & I915_VMA_BIND_MASK)) {
|
|
err = i915_vma_insert(vma, size, alignment, flags);
|
|
if (err)
|
|
goto err_active;
|
|
|
|
if (i915_is_ggtt(vma->vm))
|
|
__i915_vma_set_map_and_fenceable(vma);
|
|
}
|
|
|
|
GEM_BUG_ON(!vma->pages);
|
|
err = i915_vma_bind(vma,
|
|
vma->obj ? vma->obj->cache_level : 0,
|
|
flags, work);
|
|
if (err)
|
|
goto err_remove;
|
|
|
|
/* There should only be at most 2 active bindings (user, global) */
|
|
GEM_BUG_ON(bound + I915_VMA_PAGES_ACTIVE < bound);
|
|
atomic_add(I915_VMA_PAGES_ACTIVE, &vma->pages_count);
|
|
list_move_tail(&vma->vm_link, &vma->vm->bound_list);
|
|
|
|
__i915_vma_pin(vma);
|
|
GEM_BUG_ON(!i915_vma_is_pinned(vma));
|
|
GEM_BUG_ON(!i915_vma_is_bound(vma, flags));
|
|
GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
|
|
|
|
err_remove:
|
|
if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK))
|
|
i915_vma_remove(vma);
|
|
err_active:
|
|
i915_active_release(&vma->active);
|
|
err_unlock:
|
|
mutex_unlock(&vma->vm->mutex);
|
|
err_fence:
|
|
if (work)
|
|
dma_fence_work_commit(&work->base);
|
|
err_pages:
|
|
vma_put_pages(vma);
|
|
return err;
|
|
}
|
|
|
|
void i915_vma_close(struct i915_vma *vma)
|
|
{
|
|
struct drm_i915_private *i915 = vma->vm->i915;
|
|
unsigned long flags;
|
|
|
|
GEM_BUG_ON(i915_vma_is_closed(vma));
|
|
|
|
/*
|
|
* We defer actually closing, unbinding and destroying the VMA until
|
|
* the next idle point, or if the object is freed in the meantime. By
|
|
* postponing the unbind, we allow for it to be resurrected by the
|
|
* client, avoiding the work required to rebind the VMA. This is
|
|
* advantageous for DRI, where the client/server pass objects
|
|
* between themselves, temporarily opening a local VMA to the
|
|
* object, and then closing it again. The same object is then reused
|
|
* on the next frame (or two, depending on the depth of the swap queue)
|
|
* causing us to rebind the VMA once more. This ends up being a lot
|
|
* of wasted work for the steady state.
|
|
*/
|
|
spin_lock_irqsave(&i915->gt.closed_lock, flags);
|
|
list_add(&vma->closed_link, &i915->gt.closed_vma);
|
|
spin_unlock_irqrestore(&i915->gt.closed_lock, flags);
|
|
}
|
|
|
|
static void __i915_vma_remove_closed(struct i915_vma *vma)
|
|
{
|
|
struct drm_i915_private *i915 = vma->vm->i915;
|
|
|
|
spin_lock_irq(&i915->gt.closed_lock);
|
|
list_del_init(&vma->closed_link);
|
|
spin_unlock_irq(&i915->gt.closed_lock);
|
|
}
|
|
|
|
void i915_vma_reopen(struct i915_vma *vma)
|
|
{
|
|
if (i915_vma_is_closed(vma))
|
|
__i915_vma_remove_closed(vma);
|
|
}
|
|
|
|
void i915_vma_destroy(struct i915_vma *vma)
|
|
{
|
|
if (drm_mm_node_allocated(&vma->node)) {
|
|
mutex_lock(&vma->vm->mutex);
|
|
atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
|
|
WARN_ON(__i915_vma_unbind(vma));
|
|
mutex_unlock(&vma->vm->mutex);
|
|
GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
|
|
}
|
|
GEM_BUG_ON(i915_vma_is_active(vma));
|
|
|
|
if (vma->obj) {
|
|
struct drm_i915_gem_object *obj = vma->obj;
|
|
|
|
spin_lock(&obj->vma.lock);
|
|
list_del(&vma->obj_link);
|
|
rb_erase(&vma->obj_node, &obj->vma.tree);
|
|
spin_unlock(&obj->vma.lock);
|
|
}
|
|
|
|
__i915_vma_remove_closed(vma);
|
|
i915_vm_put(vma->vm);
|
|
|
|
i915_active_fini(&vma->active);
|
|
i915_vma_free(vma);
|
|
}
|
|
|
|
void i915_vma_parked(struct drm_i915_private *i915)
|
|
{
|
|
struct i915_vma *vma, *next;
|
|
|
|
spin_lock_irq(&i915->gt.closed_lock);
|
|
list_for_each_entry_safe(vma, next, &i915->gt.closed_vma, closed_link) {
|
|
struct drm_i915_gem_object *obj = vma->obj;
|
|
struct i915_address_space *vm = vma->vm;
|
|
|
|
/* XXX All to avoid keeping a reference on i915_vma itself */
|
|
|
|
if (!kref_get_unless_zero(&obj->base.refcount))
|
|
continue;
|
|
|
|
if (!i915_vm_tryopen(vm)) {
|
|
i915_gem_object_put(obj);
|
|
obj = NULL;
|
|
}
|
|
|
|
spin_unlock_irq(&i915->gt.closed_lock);
|
|
|
|
if (obj) {
|
|
i915_vma_destroy(vma);
|
|
i915_gem_object_put(obj);
|
|
}
|
|
|
|
i915_vm_close(vm);
|
|
|
|
/* Restart after dropping lock */
|
|
spin_lock_irq(&i915->gt.closed_lock);
|
|
next = list_first_entry(&i915->gt.closed_vma,
|
|
typeof(*next), closed_link);
|
|
}
|
|
spin_unlock_irq(&i915->gt.closed_lock);
|
|
}
|
|
|
|
static void __i915_vma_iounmap(struct i915_vma *vma)
|
|
{
|
|
GEM_BUG_ON(i915_vma_is_pinned(vma));
|
|
|
|
if (vma->iomap == NULL)
|
|
return;
|
|
|
|
io_mapping_unmap(vma->iomap);
|
|
vma->iomap = NULL;
|
|
}
|
|
|
|
void i915_vma_revoke_mmap(struct i915_vma *vma)
|
|
{
|
|
struct drm_vma_offset_node *node = &vma->obj->base.vma_node;
|
|
u64 vma_offset;
|
|
|
|
lockdep_assert_held(&vma->vm->mutex);
|
|
|
|
if (!i915_vma_has_userfault(vma))
|
|
return;
|
|
|
|
GEM_BUG_ON(!i915_vma_is_map_and_fenceable(vma));
|
|
GEM_BUG_ON(!vma->obj->userfault_count);
|
|
|
|
vma_offset = vma->ggtt_view.partial.offset << PAGE_SHIFT;
|
|
unmap_mapping_range(vma->vm->i915->drm.anon_inode->i_mapping,
|
|
drm_vma_node_offset_addr(node) + vma_offset,
|
|
vma->size,
|
|
1);
|
|
|
|
i915_vma_unset_userfault(vma);
|
|
if (!--vma->obj->userfault_count)
|
|
list_del(&vma->obj->userfault_link);
|
|
}
|
|
|
|
int __i915_vma_move_to_active(struct i915_vma *vma, struct i915_request *rq)
|
|
{
|
|
int err;
|
|
|
|
GEM_BUG_ON(!i915_vma_is_pinned(vma));
|
|
|
|
/* Wait for the vma to be bound before we start! */
|
|
err = i915_request_await_active(rq, &vma->active);
|
|
if (err)
|
|
return err;
|
|
|
|
return i915_active_add_request(&vma->active, rq);
|
|
}
|
|
|
|
int i915_vma_move_to_active(struct i915_vma *vma,
|
|
struct i915_request *rq,
|
|
unsigned int flags)
|
|
{
|
|
struct drm_i915_gem_object *obj = vma->obj;
|
|
int err;
|
|
|
|
assert_object_held(obj);
|
|
|
|
err = __i915_vma_move_to_active(vma, rq);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
if (flags & EXEC_OBJECT_WRITE) {
|
|
if (intel_frontbuffer_invalidate(obj->frontbuffer, ORIGIN_CS))
|
|
i915_active_add_request(&obj->frontbuffer->write, rq);
|
|
|
|
dma_resv_add_excl_fence(vma->resv, &rq->fence);
|
|
obj->write_domain = I915_GEM_DOMAIN_RENDER;
|
|
obj->read_domains = 0;
|
|
} else {
|
|
err = dma_resv_reserve_shared(vma->resv, 1);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
dma_resv_add_shared_fence(vma->resv, &rq->fence);
|
|
obj->write_domain = 0;
|
|
}
|
|
obj->read_domains |= I915_GEM_GPU_DOMAINS;
|
|
obj->mm.dirty = true;
|
|
|
|
GEM_BUG_ON(!i915_vma_is_active(vma));
|
|
return 0;
|
|
}
|
|
|
|
int __i915_vma_unbind(struct i915_vma *vma)
|
|
{
|
|
int ret;
|
|
|
|
lockdep_assert_held(&vma->vm->mutex);
|
|
|
|
/*
|
|
* First wait upon any activity as retiring the request may
|
|
* have side-effects such as unpinning or even unbinding this vma.
|
|
*
|
|
* XXX Actually waiting under the vm->mutex is a hinderance and
|
|
* should be pipelined wherever possible. In cases where that is
|
|
* unavoidable, we should lift the wait to before the mutex.
|
|
*/
|
|
ret = i915_vma_sync(vma);
|
|
if (ret)
|
|
return ret;
|
|
|
|
GEM_BUG_ON(i915_vma_is_active(vma));
|
|
if (i915_vma_is_pinned(vma)) {
|
|
vma_print_allocator(vma, "is pinned");
|
|
return -EBUSY;
|
|
}
|
|
|
|
GEM_BUG_ON(i915_vma_is_active(vma));
|
|
if (!drm_mm_node_allocated(&vma->node))
|
|
return 0;
|
|
|
|
if (i915_vma_is_map_and_fenceable(vma)) {
|
|
/*
|
|
* Check that we have flushed all writes through the GGTT
|
|
* before the unbind, other due to non-strict nature of those
|
|
* indirect writes they may end up referencing the GGTT PTE
|
|
* after the unbind.
|
|
*/
|
|
i915_vma_flush_writes(vma);
|
|
GEM_BUG_ON(i915_vma_has_ggtt_write(vma));
|
|
|
|
/* release the fence reg _after_ flushing */
|
|
ret = i915_vma_revoke_fence(vma);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Force a pagefault for domain tracking on next user access */
|
|
i915_vma_revoke_mmap(vma);
|
|
|
|
__i915_vma_iounmap(vma);
|
|
clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
|
|
}
|
|
GEM_BUG_ON(vma->fence);
|
|
GEM_BUG_ON(i915_vma_has_userfault(vma));
|
|
|
|
if (likely(atomic_read(&vma->vm->open))) {
|
|
trace_i915_vma_unbind(vma);
|
|
vma->ops->unbind_vma(vma);
|
|
}
|
|
atomic_and(~(I915_VMA_BIND_MASK | I915_VMA_ERROR), &vma->flags);
|
|
|
|
vma_unbind_pages(vma);
|
|
i915_vma_remove(vma);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int i915_vma_unbind(struct i915_vma *vma)
|
|
{
|
|
struct i915_address_space *vm = vma->vm;
|
|
int err;
|
|
|
|
err = mutex_lock_interruptible(&vm->mutex);
|
|
if (err)
|
|
return err;
|
|
|
|
err = __i915_vma_unbind(vma);
|
|
mutex_unlock(&vm->mutex);
|
|
|
|
return err;
|
|
}
|
|
|
|
struct i915_vma *i915_vma_make_unshrinkable(struct i915_vma *vma)
|
|
{
|
|
i915_gem_object_make_unshrinkable(vma->obj);
|
|
return vma;
|
|
}
|
|
|
|
void i915_vma_make_shrinkable(struct i915_vma *vma)
|
|
{
|
|
i915_gem_object_make_shrinkable(vma->obj);
|
|
}
|
|
|
|
void i915_vma_make_purgeable(struct i915_vma *vma)
|
|
{
|
|
i915_gem_object_make_purgeable(vma->obj);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
|
|
#include "selftests/i915_vma.c"
|
|
#endif
|
|
|
|
static void i915_global_vma_shrink(void)
|
|
{
|
|
kmem_cache_shrink(global.slab_vmas);
|
|
}
|
|
|
|
static void i915_global_vma_exit(void)
|
|
{
|
|
kmem_cache_destroy(global.slab_vmas);
|
|
}
|
|
|
|
static struct i915_global_vma global = { {
|
|
.shrink = i915_global_vma_shrink,
|
|
.exit = i915_global_vma_exit,
|
|
} };
|
|
|
|
int __init i915_global_vma_init(void)
|
|
{
|
|
global.slab_vmas = KMEM_CACHE(i915_vma, SLAB_HWCACHE_ALIGN);
|
|
if (!global.slab_vmas)
|
|
return -ENOMEM;
|
|
|
|
i915_global_register(&global.base);
|
|
return 0;
|
|
}
|