diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_vma.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_vma.c | 1414 |
1 files changed, 1414 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c new file mode 100644 index 000000000..50a86fd89 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_vma.c @@ -0,0 +1,1414 @@ +/* + * 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_engine_heartbeat.h" +#include "gt/intel_gt.h" +#include "gt/intel_gt_requests.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 *pos = ERR_PTR(-E2BIG); + 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); + + kref_init(&vma->ref); + 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)); + + spin_lock(&obj->vma.lock); + + if (i915_is_ggtt(vm)) { + if (unlikely(overflows_type(vma->size, u32))) + goto err_unlock; + + 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_unlock; + + 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)); + } + + rb = NULL; + p = &obj->vma.tree.rb_node; + while (*p) { + 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) + p = &rb->rb_right; + else if (cmp > 0) + p = &rb->rb_left; + else + goto err_unlock; + } + 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_unlock: + spin_unlock(&obj->vma.lock); +err_vma: + i915_vm_put(vm); + i915_vma_free(vma); + return pos; +} + +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_address_space *vm; + struct i915_vm_pt_stash stash; + struct i915_vma *vma; + struct drm_i915_gem_object *pinned; + struct i915_sw_dma_fence_cb cb; + 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; + + vma->ops->bind_vma(vw->vm, &vw->stash, + vma, vw->cache_level, vw->flags); + return 0; +} + +static void __vma_release(struct dma_fence_work *work) +{ + struct i915_vma_work *vw = container_of(work, typeof(*vw), base); + + if (vw->pinned) { + __i915_gem_object_unpin_pages(vw->pinned); + i915_gem_object_put(vw->pinned); + } + + i915_vm_free_pt_stash(vw->vm, &vw->stash); + i915_vm_put(vw->vm); +} + +static const struct dma_fence_work_ops bind_ops = { + .name = "bind", + .work = __vma_bind, + .release = __vma_release, +}; + +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; +} + +int i915_vma_wait_for_bind(struct i915_vma *vma) +{ + int err = 0; + + if (rcu_access_pointer(vma->active.excl.fence)) { + struct dma_fence *fence; + + rcu_read_lock(); + fence = dma_fence_get_rcu_safe(&vma->active.excl.fence); + rcu_read_unlock(); + if (fence) { + err = dma_fence_wait(fence, MAX_SCHEDULE_TIMEOUT); + dma_fence_put(fence); + } + } + + return err; +} + +/** + * 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; + + 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; + + 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->vm->bind_async_flags) { + struct dma_fence *prev; + + work->vma = vma; + work->cache_level = cache_level; + work->flags = bind_flags; + + /* + * 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. + */ + prev = i915_active_set_exclusive(&vma->active, &work->base.dma); + if (prev) { + __i915_sw_fence_await_dma_fence(&work->base.chain, + prev, + &work->cb); + dma_fence_put(prev); + } + + work->base.dma.error = 0; /* enable the queue_work() */ + + if (vma->obj) { + __i915_gem_object_pin_pages(vma->obj); + work->pinned = i915_gem_object_get(vma->obj); + } + } else { + vma->ops->bind_vma(vma->vm, NULL, vma, cache_level, bind_flags); + } + + if (vma->obj) + set_bit(I915_BO_WAS_BOUND_BIT, &vma->obj->flags); + + atomic_or(bind_flags, &vma->flags); + return 0; +} + +void __iomem *i915_vma_pin_iomap(struct i915_vma *vma) +{ + void __iomem *ptr; + int err; + + 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); + + /* NB Access through the GTT requires the device to be awake. */ + 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); + + 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; +} + +/** + * 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_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); + + 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); +} + +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_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww, + u64 size, u64 alignment, u64 flags) +{ + struct i915_vma_work *work = NULL; + intel_wakeref_t wakeref = 0; + unsigned int bound; + int err; + +#ifdef CONFIG_PROVE_LOCKING + if (debug_locks && lockdep_is_held(&vma->vm->i915->drm.struct_mutex)) + WARN_ON(!ww); +#endif + + BUILD_BUG_ON(PIN_GLOBAL != I915_VMA_GLOBAL_BIND); + BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND); + + 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 & PIN_GLOBAL) + wakeref = intel_runtime_pm_get(&vma->vm->i915->runtime_pm); + + if (flags & vma->vm->bind_async_flags) { + work = i915_vma_work(); + if (!work) { + err = -ENOMEM; + goto err_rpm; + } + + work->vm = i915_vm_get(vma->vm); + + /* Allocate enough page directories to used PTE */ + if (vma->vm->allocate_va_range) { + err = i915_vm_alloc_pt_stash(vma->vm, + &work->stash, + vma->size); + if (err) + goto err_fence; + + err = i915_vm_pin_pt_stash(vma->vm, + &work->stash); + if (err) + goto err_fence; + } + } + + /* + * Differentiate between user/kernel vma inside the aliasing-ppgtt. + * + * We conflate the Global GTT with the user's vma when using the + * aliasing-ppgtt, but it is still vitally important to try and + * keep the use cases distinct. For example, userptr objects are + * not allowed inside the Global GTT as that will cause lock + * inversions when we have to evict them the mmu_notifier callbacks - + * but they are allowed to be part of the user ppGTT which can never + * be mapped. As such we try to give the distinct users of the same + * mutex, distinct lockclasses [equivalent to how we keep i915_ggtt + * and i915_ppgtt separate]. + * + * NB this may cause us to mask real lock inversions -- while the + * code is safe today, lockdep may not be able to spot future + * transgressions. + */ + err = mutex_lock_interruptible_nested(&vma->vm->mutex, + !(flags & PIN_GLOBAL)); + if (err) + goto err_fence; + + /* No more allocations allowed now we hold vm->mutex */ + + if (unlikely(i915_vma_is_closed(vma))) { + err = -ENOENT; + goto err_unlock; + } + + 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_imm(&work->base); +err_rpm: + if (wakeref) + intel_runtime_pm_put(&vma->vm->i915->runtime_pm, wakeref); + vma_put_pages(vma); + return err; +} + +static void flush_idle_contexts(struct intel_gt *gt) +{ + struct intel_engine_cs *engine; + enum intel_engine_id id; + + for_each_engine(engine, gt, id) + intel_engine_flush_barriers(engine); + + intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT); +} + +int i915_ggtt_pin(struct i915_vma *vma, struct i915_gem_ww_ctx *ww, + u32 align, unsigned int flags) +{ + struct i915_address_space *vm = vma->vm; + int err; + + GEM_BUG_ON(!i915_vma_is_ggtt(vma)); + + do { + err = i915_vma_pin_ww(vma, ww, 0, align, flags | PIN_GLOBAL); + if (err != -ENOSPC) { + if (!err) { + err = i915_vma_wait_for_bind(vma); + if (err) + i915_vma_unpin(vma); + } + return err; + } + + /* Unlike i915_vma_pin, we don't take no for an answer! */ + flush_idle_contexts(vm->gt); + if (mutex_lock_interruptible(&vm->mutex) == 0) { + i915_gem_evict_vm(vm); + mutex_unlock(&vm->mutex); + } + } while (1); +} + +static void __vma_close(struct i915_vma *vma, struct intel_gt *gt) +{ + /* + * 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. + */ + GEM_BUG_ON(i915_vma_is_closed(vma)); + list_add(&vma->closed_link, >->closed_vma); +} + +void i915_vma_close(struct i915_vma *vma) +{ + struct intel_gt *gt = vma->vm->gt; + unsigned long flags; + + if (i915_vma_is_ggtt(vma)) + return; + + GEM_BUG_ON(!atomic_read(&vma->open_count)); + if (atomic_dec_and_lock_irqsave(&vma->open_count, + >->closed_lock, + flags)) { + __vma_close(vma, gt); + 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_release(struct kref *ref) +{ + struct i915_vma *vma = container_of(ref, typeof(*vma), ref); + + 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); + if (!RB_EMPTY_NODE(&vma->obj_node)) + 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; + LIST_HEAD(closed); + + 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); + continue; + } + + list_move(&vma->closed_link, &closed); + } + spin_unlock_irq(>->closed_lock); + + /* As the GT is held idle, no vma can be reopened as we destroy them */ + list_for_each_entry_safe(vma, next, &closed, closed_link) { + struct drm_i915_gem_object *obj = vma->obj; + struct i915_address_space *vm = vma->vm; + + INIT_LIST_HEAD(&vma->closed_link); + __i915_vma_put(vma); + + i915_gem_object_put(obj); + i915_vm_close(vm); + } +} + +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; + u64 vma_offset; + + if (!i915_vma_has_userfault(vma)) + return; + + GEM_BUG_ON(!i915_vma_is_map_and_fenceable(vma)); + GEM_BUG_ON(!vma->obj->userfault_count); + + node = &vma->mmo->vma_node; + 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); +} + +static int +__i915_request_await_bind(struct i915_request *rq, struct i915_vma *vma) +{ + return __i915_request_await_exclusive(rq, &vma->active); +} + +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_bind(rq, vma); + 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; + } + + if (flags & EXEC_OBJECT_NEEDS_FENCE && vma->fence) + i915_active_add_request(&vma->fence->active, rq); + + obj->read_domains |= I915_GEM_GPU_DOMAINS; + obj->mm.dirty = true; + + GEM_BUG_ON(!i915_vma_is_active(vma)); + return 0; +} + +void __i915_vma_evict(struct i915_vma *vma) +{ + GEM_BUG_ON(i915_vma_is_pinned(vma)); + + if (i915_vma_is_map_and_fenceable(vma)) { + /* Force a pagefault for domain tracking on next user access */ + i915_vma_revoke_mmap(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. + * + * Note that we may be concurrently poking at the GGTT_WRITE + * bit from set-domain, as we mark all GGTT vma associated + * with an object. We know this is for another vma, as we + * are currently unbinding this one -- so if this vma will be + * reused, it will be refaulted and have its dirty bit set + * before the next write. + */ + i915_vma_flush_writes(vma); + + /* release the fence reg _after_ flushing */ + i915_vma_revoke_fence(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->vm, vma); + } + atomic_and(~(I915_VMA_BIND_MASK | I915_VMA_ERROR | I915_VMA_GGTT_WRITE), + &vma->flags); + + i915_vma_detach(vma); + vma_unbind_pages(vma); +} + +int __i915_vma_unbind(struct i915_vma *vma) +{ + int ret; + + lockdep_assert_held(&vma->vm->mutex); + + if (!drm_mm_node_allocated(&vma->node)) + return 0; + + if (i915_vma_is_pinned(vma)) { + vma_print_allocator(vma, "is pinned"); + return -EAGAIN; + } + + /* + * After confirming that no one else is pinning this vma, wait for + * any laggards who may have crept in during the wait (through + * a residual pin skipping the vm->mutex) to complete. + */ + ret = i915_vma_sync(vma); + if (ret) + return ret; + + GEM_BUG_ON(i915_vma_is_active(vma)); + __i915_vma_evict(vma); + + drm_mm_remove_node(&vma->node); /* pairs with i915_vma_release() */ + return 0; +} + +int i915_vma_unbind(struct i915_vma *vma) +{ + struct i915_address_space *vm = vma->vm; + intel_wakeref_t wakeref = 0; + int err; + + /* Optimistic wait before taking the mutex */ + err = i915_vma_sync(vma); + if (err) + return err; + + if (!drm_mm_node_allocated(&vma->node)) + return 0; + + if (i915_vma_is_pinned(vma)) { + vma_print_allocator(vma, "is pinned"); + return -EAGAIN; + } + + if (i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND)) + /* XXX not always required: nop_clear_range */ + wakeref = intel_runtime_pm_get(&vm->i915->runtime_pm); + + err = mutex_lock_interruptible_nested(&vma->vm->mutex, !wakeref); + if (err) + goto out_rpm; + + err = __i915_vma_unbind(vma); + mutex_unlock(&vm->mutex); + +out_rpm: + if (wakeref) + intel_runtime_pm_put(&vm->i915->runtime_pm, wakeref); + 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; +} |