| /* |
| * Copyright © 2016 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. |
| * |
| */ |
| |
| #include <linux/sched/mm.h> |
| #include <drm/drm_gem.h> |
| |
| #include "display/intel_frontbuffer.h" |
| |
| #include "gt/intel_engine.h" |
| #include "gt/intel_gt.h" |
| |
| #include "i915_drv.h" |
| #include "i915_globals.h" |
| #include "i915_sw_fence_work.h" |
| #include "i915_trace.h" |
| #include "i915_vma.h" |
| |
| static struct i915_global_vma { |
| struct i915_global base; |
| struct kmem_cache *slab_vmas; |
| } global; |
| |
| struct i915_vma *i915_vma_alloc(void) |
| { |
| return kmem_cache_zalloc(global.slab_vmas, GFP_KERNEL); |
| } |
| |
| void i915_vma_free(struct i915_vma *vma) |
| { |
| return kmem_cache_free(global.slab_vmas, vma); |
| } |
| |
| #if IS_ENABLED(CONFIG_DRM_I915_ERRLOG_GEM) && IS_ENABLED(CONFIG_DRM_DEBUG_MM) |
| |
| #include <linux/stackdepot.h> |
| |
| static void vma_print_allocator(struct i915_vma *vma, const char *reason) |
| { |
| unsigned long *entries; |
| unsigned int nr_entries; |
| char buf[512]; |
| |
| if (!vma->node.stack) { |
| DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: unknown owner\n", |
| vma->node.start, vma->node.size, reason); |
| return; |
| } |
| |
| nr_entries = stack_depot_fetch(vma->node.stack, &entries); |
| stack_trace_snprint(buf, sizeof(buf), entries, nr_entries, 0); |
| DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: inserted at %s\n", |
| vma->node.start, vma->node.size, reason, buf); |
| } |
| |
| #else |
| |
| static void vma_print_allocator(struct i915_vma *vma, const char *reason) |
| { |
| } |
| |
| #endif |
| |
| static inline struct i915_vma *active_to_vma(struct i915_active *ref) |
| { |
| return container_of(ref, typeof(struct i915_vma), active); |
| } |
| |
| static int __i915_vma_active(struct i915_active *ref) |
| { |
| return i915_vma_tryget(active_to_vma(ref)) ? 0 : -ENOENT; |
| } |
| |
| __i915_active_call |
| static void __i915_vma_retire(struct i915_active *ref) |
| { |
| i915_vma_put(active_to_vma(ref)); |
| } |
| |
| static struct i915_vma * |
| vma_create(struct drm_i915_gem_object *obj, |
| struct i915_address_space *vm, |
| const struct i915_ggtt_view *view) |
| { |
| struct i915_vma *vma; |
| struct rb_node *rb, **p; |
| |
| /* The aliasing_ppgtt should never be used directly! */ |
| GEM_BUG_ON(vm == &vm->gt->ggtt->alias->vm); |
| |
| vma = i915_vma_alloc(); |
| if (vma == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| mutex_init(&vma->pages_mutex); |
| vma->vm = i915_vm_get(vm); |
| vma->ops = &vm->vma_ops; |
| vma->obj = obj; |
| vma->resv = obj->base.resv; |
| vma->size = obj->base.size; |
| vma->display_alignment = I915_GTT_MIN_ALIGNMENT; |
| |
| i915_active_init(&vma->active, __i915_vma_active, __i915_vma_retire); |
| |
| /* Declare ourselves safe for use inside shrinkers */ |
| if (IS_ENABLED(CONFIG_LOCKDEP)) { |
| fs_reclaim_acquire(GFP_KERNEL); |
| might_lock(&vma->active.mutex); |
| fs_reclaim_release(GFP_KERNEL); |
| } |
| |
| INIT_LIST_HEAD(&vma->closed_link); |
| |
| if (view && view->type != I915_GGTT_VIEW_NORMAL) { |
| vma->ggtt_view = *view; |
| if (view->type == I915_GGTT_VIEW_PARTIAL) { |
| GEM_BUG_ON(range_overflows_t(u64, |
| view->partial.offset, |
| view->partial.size, |
| obj->base.size >> PAGE_SHIFT)); |
| vma->size = view->partial.size; |
| vma->size <<= PAGE_SHIFT; |
| GEM_BUG_ON(vma->size > obj->base.size); |
| } else if (view->type == I915_GGTT_VIEW_ROTATED) { |
| vma->size = intel_rotation_info_size(&view->rotated); |
| vma->size <<= PAGE_SHIFT; |
| } else if (view->type == I915_GGTT_VIEW_REMAPPED) { |
| vma->size = intel_remapped_info_size(&view->remapped); |
| vma->size <<= PAGE_SHIFT; |
| } |
| } |
| |
| if (unlikely(vma->size > vm->total)) |
| goto err_vma; |
| |
| GEM_BUG_ON(!IS_ALIGNED(vma->size, I915_GTT_PAGE_SIZE)); |
| |
| if (i915_is_ggtt(vm)) { |
| if (unlikely(overflows_type(vma->size, u32))) |
| goto err_vma; |
| |
| vma->fence_size = i915_gem_fence_size(vm->i915, vma->size, |
| i915_gem_object_get_tiling(obj), |
| i915_gem_object_get_stride(obj)); |
| if (unlikely(vma->fence_size < vma->size || /* overflow */ |
| vma->fence_size > vm->total)) |
| goto err_vma; |
| |
| GEM_BUG_ON(!IS_ALIGNED(vma->fence_size, I915_GTT_MIN_ALIGNMENT)); |
| |
| vma->fence_alignment = i915_gem_fence_alignment(vm->i915, vma->size, |
| i915_gem_object_get_tiling(obj), |
| i915_gem_object_get_stride(obj)); |
| GEM_BUG_ON(!is_power_of_2(vma->fence_alignment)); |
| |
| __set_bit(I915_VMA_GGTT_BIT, __i915_vma_flags(vma)); |
| } |
| |
| spin_lock(&obj->vma.lock); |
| |
| rb = NULL; |
| p = &obj->vma.tree.rb_node; |
| while (*p) { |
| struct i915_vma *pos; |
| long cmp; |
| |
| rb = *p; |
| pos = rb_entry(rb, struct i915_vma, obj_node); |
| |
| /* |
| * If the view already exists in the tree, another thread |
| * already created a matching vma, so return the older instance |
| * and dispose of ours. |
| */ |
| cmp = i915_vma_compare(pos, vm, view); |
| if (cmp == 0) { |
| spin_unlock(&obj->vma.lock); |
| i915_vma_free(vma); |
| return pos; |
| } |
| |
| if (cmp < 0) |
| p = &rb->rb_right; |
| else |
| p = &rb->rb_left; |
| } |
| rb_link_node(&vma->obj_node, rb, p); |
| rb_insert_color(&vma->obj_node, &obj->vma.tree); |
| |
| if (i915_vma_is_ggtt(vma)) |
| /* |
| * We put the GGTT vma at the start of the vma-list, followed |
| * by the ppGGTT vma. This allows us to break early when |
| * iterating over only the GGTT vma for an object, see |
| * for_each_ggtt_vma() |
| */ |
| list_add(&vma->obj_link, &obj->vma.list); |
| else |
| list_add_tail(&vma->obj_link, &obj->vma.list); |
| |
| spin_unlock(&obj->vma.lock); |
| |
| return vma; |
| |
| err_vma: |
| i915_vma_free(vma); |
| return ERR_PTR(-E2BIG); |
| } |
| |
| static struct i915_vma * |
| vma_lookup(struct drm_i915_gem_object *obj, |
| struct i915_address_space *vm, |
| const struct i915_ggtt_view *view) |
| { |
| struct rb_node *rb; |
| |
| rb = obj->vma.tree.rb_node; |
| while (rb) { |
| struct i915_vma *vma = rb_entry(rb, struct i915_vma, obj_node); |
| long cmp; |
| |
| cmp = i915_vma_compare(vma, vm, view); |
| if (cmp == 0) |
| return vma; |
| |
| if (cmp < 0) |
| rb = rb->rb_right; |
| else |
| rb = rb->rb_left; |
| } |
| |
| return NULL; |
| } |
| |
| /** |
| * i915_vma_instance - return the singleton instance of the VMA |
| * @obj: parent &struct drm_i915_gem_object to be mapped |
| * @vm: address space in which the mapping is located |
| * @view: additional mapping requirements |
| * |
| * i915_vma_instance() looks up an existing VMA of the @obj in the @vm with |
| * the same @view characteristics. If a match is not found, one is created. |
| * Once created, the VMA is kept until either the object is freed, or the |
| * address space is closed. |
| * |
| * Returns the vma, or an error pointer. |
| */ |
| struct i915_vma * |
| i915_vma_instance(struct drm_i915_gem_object *obj, |
| struct i915_address_space *vm, |
| const struct i915_ggtt_view *view) |
| { |
| struct i915_vma *vma; |
| |
| GEM_BUG_ON(view && !i915_is_ggtt(vm)); |
| GEM_BUG_ON(!atomic_read(&vm->open)); |
| |
| spin_lock(&obj->vma.lock); |
| vma = vma_lookup(obj, vm, view); |
| spin_unlock(&obj->vma.lock); |
| |
| /* vma_create() will resolve the race if another creates the vma */ |
| if (unlikely(!vma)) |
| vma = vma_create(obj, vm, view); |
| |
| GEM_BUG_ON(!IS_ERR(vma) && i915_vma_compare(vma, vm, view)); |
| return vma; |
| } |
| |
| struct i915_vma_work { |
| struct dma_fence_work base; |
| struct i915_vma *vma; |
| enum i915_cache_level cache_level; |
| unsigned int flags; |
| }; |
| |
| static int __vma_bind(struct dma_fence_work *work) |
| { |
| struct i915_vma_work *vw = container_of(work, typeof(*vw), base); |
| struct i915_vma *vma = vw->vma; |
| int err; |
| |
| err = vma->ops->bind_vma(vma, vw->cache_level, vw->flags); |
| if (err) |
| atomic_or(I915_VMA_ERROR, &vma->flags); |
| |
| if (vma->obj) |
| __i915_gem_object_unpin_pages(vma->obj); |
| |
| return err; |
| } |
| |
| static const struct dma_fence_work_ops bind_ops = { |
| .name = "bind", |
| .work = __vma_bind, |
| }; |
| |
| struct i915_vma_work *i915_vma_work(void) |
| { |
| struct i915_vma_work *vw; |
| |
| vw = kzalloc(sizeof(*vw), GFP_KERNEL); |
| if (!vw) |
| return NULL; |
| |
| dma_fence_work_init(&vw->base, &bind_ops); |
| vw->base.dma.error = -EAGAIN; /* disable the worker by default */ |
| |
| return vw; |
| } |
| |
| /** |
| * i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space. |
| * @vma: VMA to map |
| * @cache_level: mapping cache level |
| * @flags: flags like global or local mapping |
| * @work: preallocated worker for allocating and binding the PTE |
| * |
| * DMA addresses are taken from the scatter-gather table of this object (or of |
| * this VMA in case of non-default GGTT views) and PTE entries set up. |
| * Note that DMA addresses are also the only part of the SG table we care about. |
| */ |
| int i915_vma_bind(struct i915_vma *vma, |
| enum i915_cache_level cache_level, |
| u32 flags, |
| struct i915_vma_work *work) |
| { |
| u32 bind_flags; |
| u32 vma_flags; |
| int ret; |
| |
| GEM_BUG_ON(!drm_mm_node_allocated(&vma->node)); |
| GEM_BUG_ON(vma->size > vma->node.size); |
| |
| if (GEM_DEBUG_WARN_ON(range_overflows(vma->node.start, |
| vma->node.size, |
| vma->vm->total))) |
| return -ENODEV; |
| |
| if (GEM_DEBUG_WARN_ON(!flags)) |
| return -EINVAL; |
| |
| bind_flags = flags; |
| bind_flags &= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND; |
| |
| vma_flags = atomic_read(&vma->flags); |
| vma_flags &= I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND; |
| if (flags & PIN_UPDATE) |
| bind_flags |= vma_flags; |
| else |
| bind_flags &= ~vma_flags; |
| if (bind_flags == 0) |
| return 0; |
| |
| GEM_BUG_ON(!vma->pages); |
| |
| trace_i915_vma_bind(vma, bind_flags); |
| if (work && (bind_flags & ~vma_flags) & vma->vm->bind_async_flags) { |
| work->vma = vma; |
| work->cache_level = cache_level; |
| work->flags = bind_flags | I915_VMA_ALLOC; |
| |
| /* |
| * Note we only want to chain up to the migration fence on |
| * the pages (not the object itself). As we don't track that, |
| * yet, we have to use the exclusive fence instead. |
| * |
| * Also note that we do not want to track the async vma as |
| * part of the obj->resv->excl_fence as it only affects |
| * execution and not content or object's backing store lifetime. |
| */ |
| GEM_BUG_ON(i915_active_has_exclusive(&vma->active)); |
| i915_active_set_exclusive(&vma->active, &work->base.dma); |
| work->base.dma.error = 0; /* enable the queue_work() */ |
| |
| if (vma->obj) |
| __i915_gem_object_pin_pages(vma->obj); |
| } else { |
| GEM_BUG_ON((bind_flags & ~vma_flags) & vma->vm->bind_async_flags); |
| ret = vma->ops->bind_vma(vma, cache_level, bind_flags); |
| if (ret) |
| return ret; |
| } |
| |
| atomic_or(bind_flags, &vma->flags); |
| return 0; |
| } |
| |
| void __iomem *i915_vma_pin_iomap(struct i915_vma *vma) |
| { |
| void __iomem *ptr; |
| int err; |
| |
| /* Access through the GTT requires the device to be awake. */ |
| assert_rpm_wakelock_held(vma->vm->gt->uncore->rpm); |
| if (GEM_WARN_ON(!i915_vma_is_map_and_fenceable(vma))) { |
| err = -ENODEV; |
| goto err; |
| } |
| |
| GEM_BUG_ON(!i915_vma_is_ggtt(vma)); |
| GEM_BUG_ON(!i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND)); |
| |
| ptr = READ_ONCE(vma->iomap); |
| if (ptr == NULL) { |
| ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->iomap, |
| vma->node.start, |
| vma->node.size); |
| if (ptr == NULL) { |
| err = -ENOMEM; |
| goto err; |
| } |
| |
| if (unlikely(cmpxchg(&vma->iomap, NULL, ptr))) { |
| io_mapping_unmap(ptr); |
| ptr = vma->iomap; |
| } |
| } |
| |
| __i915_vma_pin(vma); |
| |
| err = i915_vma_pin_fence(vma); |
| if (err) |
| goto err_unpin; |
| |
| i915_vma_set_ggtt_write(vma); |
| return ptr; |
| |
| err_unpin: |
| __i915_vma_unpin(vma); |
| err: |
| return IO_ERR_PTR(err); |
| } |
| |
| void i915_vma_flush_writes(struct i915_vma *vma) |
| { |
| if (i915_vma_unset_ggtt_write(vma)) |
| intel_gt_flush_ggtt_writes(vma->vm->gt); |
| } |
| |
| void i915_vma_unpin_iomap(struct i915_vma *vma) |
| { |
| GEM_BUG_ON(vma->iomap == NULL); |
| |
| i915_vma_flush_writes(vma); |
| |
| i915_vma_unpin_fence(vma); |
| i915_vma_unpin(vma); |
| } |
| |
| void i915_vma_unpin_and_release(struct i915_vma **p_vma, unsigned int flags) |
| { |
| 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)); |
| |
| if (vma->obj) { |
| struct drm_i915_gem_object *obj = vma->obj; |
| |
| atomic_inc(&obj->bind_count); |
| assert_bind_count(obj); |
| } |
| list_add_tail(&vma->vm_link, &vma->vm->bound_list); |
| |
| return 0; |
| } |
| |
| static void |
| i915_vma_detach(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)); |
| |
| /* |
| * 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. |
| */ |
| list_del(&vma->vm_link); |
| if (vma->obj) { |
| struct drm_i915_gem_object *obj = vma->obj; |
| |
| assert_bind_count(obj); |
| atomic_dec(&obj->bind_count); |
| } |
| } |
| |
| 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_detach(vma); |
| drm_mm_remove_node(&vma->node); |
| } |
| 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 intel_gt *gt = vma->vm->gt; |
| 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(>->closed_lock, flags); |
| list_add(&vma->closed_link, >->closed_vma); |
| spin_unlock_irqrestore(>->closed_lock, flags); |
| } |
| |
| static void __i915_vma_remove_closed(struct i915_vma *vma) |
| { |
| struct intel_gt *gt = vma->vm->gt; |
| |
| spin_lock_irq(>->closed_lock); |
| list_del_init(&vma->closed_link); |
| spin_unlock_irq(>->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 intel_gt *gt) |
| { |
| struct i915_vma *vma, *next; |
| |
| spin_lock_irq(>->closed_lock); |
| list_for_each_entry_safe(vma, next, >->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(>->closed_lock); |
| |
| if (obj) { |
| i915_vma_destroy(vma); |
| i915_gem_object_put(obj); |
| } |
| |
| i915_vm_close(vm); |
| |
| /* Restart after dropping lock */ |
| spin_lock_irq(>->closed_lock); |
| next = list_first_entry(>->closed_vma, |
| typeof(*next), closed_link); |
| } |
| spin_unlock_irq(>->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) { |
| struct intel_frontbuffer *front; |
| |
| front = __intel_frontbuffer_get(obj); |
| if (unlikely(front)) { |
| if (intel_frontbuffer_invalidate(front, ORIGIN_CS)) |
| i915_active_add_request(&front->write, rq); |
| intel_frontbuffer_put(front); |
| } |
| |
| 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); |
| |
| i915_vma_detach(vma); |
| vma_unbind_pages(vma); |
| |
| drm_mm_remove_node(&vma->node); /* pairs with i915_vma_destroy() */ |
| 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; |
| } |