diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_vma.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_vma.c | 638 |
1 files changed, 638 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 000000000000..a792dcb902b5 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_vma.c @@ -0,0 +1,638 @@ +/* + * 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 "i915_vma.h" + +#include "i915_drv.h" +#include "intel_ringbuffer.h" +#include "intel_frontbuffer.h" + +#include <drm/drm_gem.h> + +static void +i915_vma_retire(struct i915_gem_active *active, + struct drm_i915_gem_request *rq) +{ + const unsigned int idx = rq->engine->id; + struct i915_vma *vma = + container_of(active, struct i915_vma, last_read[idx]); + struct drm_i915_gem_object *obj = vma->obj; + + GEM_BUG_ON(!i915_vma_has_active_engine(vma, idx)); + + i915_vma_clear_active(vma, idx); + if (i915_vma_is_active(vma)) + return; + + list_move_tail(&vma->vm_link, &vma->vm->inactive_list); + if (unlikely(i915_vma_is_closed(vma) && !i915_vma_is_pinned(vma))) + WARN_ON(i915_vma_unbind(vma)); + + GEM_BUG_ON(!i915_gem_object_is_active(obj)); + if (--obj->active_count) + return; + + /* Bump our place on the bound list to keep it roughly in LRU order + * so that we don't steal from recently used but inactive objects + * (unless we are forced to ofc!) + */ + if (obj->bind_count) + list_move_tail(&obj->global_link, &rq->i915->mm.bound_list); + + obj->mm.dirty = true; /* be paranoid */ + + if (i915_gem_object_has_active_reference(obj)) { + i915_gem_object_clear_active_reference(obj); + i915_gem_object_put(obj); + } +} + +static struct i915_vma * +__i915_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; + int i; + + GEM_BUG_ON(vm->closed); + + vma = kmem_cache_zalloc(to_i915(obj->base.dev)->vmas, GFP_KERNEL); + if (vma == NULL) + return ERR_PTR(-ENOMEM); + + INIT_LIST_HEAD(&vma->exec_list); + for (i = 0; i < ARRAY_SIZE(vma->last_read); i++) + init_request_active(&vma->last_read[i], i915_vma_retire); + init_request_active(&vma->last_fence, NULL); + list_add(&vma->vm_link, &vm->unbound_list); + vma->vm = vm; + vma->obj = obj; + vma->size = obj->base.size; + + if (view) { + vma->ggtt_view = *view; + if (view->type == I915_GGTT_VIEW_PARTIAL) { + vma->size = view->params.partial.size; + vma->size <<= PAGE_SHIFT; + } else if (view->type == I915_GGTT_VIEW_ROTATED) { + vma->size = + intel_rotation_info_size(&view->params.rotated); + vma->size <<= PAGE_SHIFT; + } + } + + if (i915_is_ggtt(vm)) { + vma->flags |= I915_VMA_GGTT; + list_add(&vma->obj_link, &obj->vma_list); + } else { + i915_ppgtt_get(i915_vm_to_ppgtt(vm)); + list_add_tail(&vma->obj_link, &obj->vma_list); + } + + rb = NULL; + p = &obj->vma_tree.rb_node; + while (*p) { + struct i915_vma *pos; + + rb = *p; + pos = rb_entry(rb, struct i915_vma, obj_node); + if (i915_vma_compare(pos, vm, view) < 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); + + return vma; +} + +struct i915_vma * +i915_vma_create(struct drm_i915_gem_object *obj, + struct i915_address_space *vm, + const struct i915_ggtt_view *view) +{ + lockdep_assert_held(&obj->base.dev->struct_mutex); + GEM_BUG_ON(view && !i915_is_ggtt(vm)); + GEM_BUG_ON(i915_gem_obj_to_vma(obj, vm, view)); + + return __i915_vma_create(obj, vm, view); +} + +/** + * 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 + * + * 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) +{ + u32 bind_flags; + u32 vma_flags; + int ret; + + if (WARN_ON(flags == 0)) + return -EINVAL; + + bind_flags = 0; + if (flags & PIN_GLOBAL) + bind_flags |= I915_VMA_GLOBAL_BIND; + if (flags & PIN_USER) + bind_flags |= I915_VMA_LOCAL_BIND; + + 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; + + if (vma_flags == 0 && vma->vm->allocate_va_range) { + trace_i915_va_alloc(vma); + ret = vma->vm->allocate_va_range(vma->vm, + vma->node.start, + vma->node.size); + if (ret) + return ret; + } + + ret = vma->vm->bind_vma(vma, cache_level, bind_flags); + if (ret) + return ret; + + vma->flags |= bind_flags; + return 0; +} + +void __iomem *i915_vma_pin_iomap(struct i915_vma *vma) +{ + void __iomem *ptr; + + /* Access through the GTT requires the device to be awake. */ + assert_rpm_wakelock_held(to_i915(vma->vm->dev)); + + lockdep_assert_held(&vma->vm->dev->struct_mutex); + if (WARN_ON(!i915_vma_is_map_and_fenceable(vma))) + return IO_ERR_PTR(-ENODEV); + + GEM_BUG_ON(!i915_vma_is_ggtt(vma)); + GEM_BUG_ON((vma->flags & I915_VMA_GLOBAL_BIND) == 0); + + ptr = vma->iomap; + if (ptr == NULL) { + ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->mappable, + vma->node.start, + vma->node.size); + if (ptr == NULL) + return IO_ERR_PTR(-ENOMEM); + + vma->iomap = ptr; + } + + __i915_vma_pin(vma); + return ptr; +} + +void i915_vma_unpin_and_release(struct i915_vma **p_vma) +{ + struct i915_vma *vma; + struct drm_i915_gem_object *obj; + + vma = fetch_and_zero(p_vma); + if (!vma) + return; + + obj = vma->obj; + + i915_vma_unpin(vma); + i915_vma_close(vma); + + __i915_gem_object_release_unless_active(obj); +} + +bool +i915_vma_misplaced(struct i915_vma *vma, u64 size, u64 alignment, u64 flags) +{ + if (!drm_mm_node_allocated(&vma->node)) + return false; + + if (vma->node.size < size) + return true; + + if (alignment && vma->node.start & (alignment - 1)) + 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) +{ + struct drm_i915_gem_object *obj = vma->obj; + struct drm_i915_private *dev_priv = to_i915(obj->base.dev); + bool mappable, fenceable; + u32 fence_size, fence_alignment; + + fence_size = i915_gem_get_ggtt_size(dev_priv, + vma->size, + i915_gem_object_get_tiling(obj)); + fence_alignment = i915_gem_get_ggtt_alignment(dev_priv, + vma->size, + i915_gem_object_get_tiling(obj), + true); + + fenceable = (vma->node.size == fence_size && + (vma->node.start & (fence_alignment - 1)) == 0); + + mappable = (vma->node.start + fence_size <= + dev_priv->ggtt.mappable_end); + + /* + * Explicitly disable for rotated VMA since the display does not + * need the fence and the VMA is not accessible to other users. + */ + if (mappable && fenceable && + vma->ggtt_view.type != I915_GGTT_VIEW_ROTATED) + vma->flags |= I915_VMA_CAN_FENCE; + else + vma->flags &= ~I915_VMA_CAN_FENCE; +} + +bool i915_gem_valid_gtt_space(struct i915_vma *vma, + unsigned long cache_level) +{ + struct drm_mm_node *gtt_space = &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 (vma->vm->mm.color_adjust == NULL) + return true; + + if (!drm_mm_node_allocated(gtt_space)) + return true; + + if (list_empty(>t_space->node_list)) + return true; + + other = list_entry(gtt_space->node_list.prev, struct drm_mm_node, node_list); + if (other->allocated && !other->hole_follows && other->color != cache_level) + return false; + + other = list_entry(gtt_space->node_list.next, struct drm_mm_node, node_list); + if (other->allocated && !gtt_space->hole_follows && other->color != cache_level) + 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) +{ + struct drm_i915_private *dev_priv = to_i915(vma->vm->dev); + struct drm_i915_gem_object *obj = vma->obj; + u64 start, end; + int ret; + + GEM_BUG_ON(vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND)); + GEM_BUG_ON(drm_mm_node_allocated(&vma->node)); + + size = max(size, vma->size); + if (flags & PIN_MAPPABLE) + size = i915_gem_get_ggtt_size(dev_priv, size, + i915_gem_object_get_tiling(obj)); + + alignment = max(max(alignment, vma->display_alignment), + i915_gem_get_ggtt_alignment(dev_priv, size, + i915_gem_object_get_tiling(obj), + flags & PIN_MAPPABLE)); + + start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0; + + end = vma->vm->total; + if (flags & PIN_MAPPABLE) + end = min_t(u64, end, dev_priv->ggtt.mappable_end); + if (flags & PIN_ZONE_4G) + end = min_t(u64, end, (1ULL << 32) - 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 [object=%zd] > %s aperture=%llu\n", + size, obj->base.size, + flags & PIN_MAPPABLE ? "mappable" : "total", + end); + return -E2BIG; + } + + ret = i915_gem_object_pin_pages(obj); + if (ret) + return ret; + + if (flags & PIN_OFFSET_FIXED) { + u64 offset = flags & PIN_OFFSET_MASK; + if (offset & (alignment - 1) || offset > end - size) { + ret = -EINVAL; + goto err_unpin; + } + + vma->node.start = offset; + vma->node.size = size; + vma->node.color = obj->cache_level; + ret = drm_mm_reserve_node(&vma->vm->mm, &vma->node); + if (ret) { + ret = i915_gem_evict_for_vma(vma); + if (ret == 0) + ret = drm_mm_reserve_node(&vma->vm->mm, &vma->node); + if (ret) + goto err_unpin; + } + } else { + u32 search_flag, alloc_flag; + + if (flags & PIN_HIGH) { + search_flag = DRM_MM_SEARCH_BELOW; + alloc_flag = DRM_MM_CREATE_TOP; + } else { + search_flag = DRM_MM_SEARCH_DEFAULT; + alloc_flag = DRM_MM_CREATE_DEFAULT; + } + + /* We only allocate in PAGE_SIZE/GTT_PAGE_SIZE (4096) chunks, + * so we know that we always have a minimum alignment of 4096. + * The drm_mm range manager is optimised to return results + * with zero alignment, so where possible use the optimal + * path. + */ + if (alignment <= 4096) + alignment = 0; + +search_free: + ret = drm_mm_insert_node_in_range_generic(&vma->vm->mm, + &vma->node, + size, alignment, + obj->cache_level, + start, end, + search_flag, + alloc_flag); + if (ret) { + ret = i915_gem_evict_something(vma->vm, size, alignment, + obj->cache_level, + start, end, + flags); + if (ret == 0) + goto search_free; + + goto err_unpin; + } + + GEM_BUG_ON(vma->node.start < start); + GEM_BUG_ON(vma->node.start + vma->node.size > end); + } + GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, obj->cache_level)); + + list_move_tail(&obj->global_link, &dev_priv->mm.bound_list); + list_move_tail(&vma->vm_link, &vma->vm->inactive_list); + obj->bind_count++; + GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count); + + return 0; + +err_unpin: + i915_gem_object_unpin_pages(obj); + return ret; +} + +int __i915_vma_do_pin(struct i915_vma *vma, + u64 size, u64 alignment, u64 flags) +{ + unsigned int bound = vma->flags; + int ret; + + lockdep_assert_held(&vma->vm->dev->struct_mutex); + GEM_BUG_ON((flags & (PIN_GLOBAL | PIN_USER)) == 0); + GEM_BUG_ON((flags & PIN_GLOBAL) && !i915_vma_is_ggtt(vma)); + + if (WARN_ON(bound & I915_VMA_PIN_OVERFLOW)) { + ret = -EBUSY; + goto err; + } + + if ((bound & I915_VMA_BIND_MASK) == 0) { + ret = i915_vma_insert(vma, size, alignment, flags); + if (ret) + goto err; + } + + ret = i915_vma_bind(vma, vma->obj->cache_level, flags); + if (ret) + goto err; + + if ((bound ^ vma->flags) & I915_VMA_GLOBAL_BIND) + __i915_vma_set_map_and_fenceable(vma); + + GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags)); + return 0; + +err: + __i915_vma_unpin(vma); + return ret; +} + +void i915_vma_destroy(struct i915_vma *vma) +{ + GEM_BUG_ON(vma->node.allocated); + GEM_BUG_ON(i915_vma_is_active(vma)); + GEM_BUG_ON(!i915_vma_is_closed(vma)); + GEM_BUG_ON(vma->fence); + + list_del(&vma->vm_link); + if (!i915_vma_is_ggtt(vma)) + i915_ppgtt_put(i915_vm_to_ppgtt(vma->vm)); + + kmem_cache_free(to_i915(vma->obj->base.dev)->vmas, vma); +} + +void i915_vma_close(struct i915_vma *vma) +{ + GEM_BUG_ON(i915_vma_is_closed(vma)); + vma->flags |= I915_VMA_CLOSED; + + list_del(&vma->obj_link); + rb_erase(&vma->obj_node, &vma->obj->vma_tree); + + if (!i915_vma_is_active(vma) && !i915_vma_is_pinned(vma)) + WARN_ON(i915_vma_unbind(vma)); +} + +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; +} + +int i915_vma_unbind(struct i915_vma *vma) +{ + struct drm_i915_gem_object *obj = vma->obj; + unsigned long active; + int ret; + + lockdep_assert_held(&obj->base.dev->struct_mutex); + + /* First wait upon any activity as retiring the request may + * have side-effects such as unpinning or even unbinding this vma. + */ + active = i915_vma_get_active(vma); + if (active) { + int idx; + + /* When a closed VMA is retired, it is unbound - eek. + * In order to prevent it from being recursively closed, + * take a pin on the vma so that the second unbind is + * aborted. + * + * Even more scary is that the retire callback may free + * the object (last active vma). To prevent the explosion + * we defer the actual object free to a worker that can + * only proceed once it acquires the struct_mutex (which + * we currently hold, therefore it cannot free this object + * before we are finished). + */ + __i915_vma_pin(vma); + + for_each_active(active, idx) { + ret = i915_gem_active_retire(&vma->last_read[idx], + &vma->vm->dev->struct_mutex); + if (ret) + break; + } + + __i915_vma_unpin(vma); + if (ret) + return ret; + + GEM_BUG_ON(i915_vma_is_active(vma)); + } + + if (i915_vma_is_pinned(vma)) + return -EBUSY; + + if (!drm_mm_node_allocated(&vma->node)) + goto destroy; + + GEM_BUG_ON(obj->bind_count == 0); + GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj)); + + if (i915_vma_is_map_and_fenceable(vma)) { + /* release the fence reg _after_ flushing */ + ret = i915_vma_put_fence(vma); + if (ret) + return ret; + + /* Force a pagefault for domain tracking on next user access */ + i915_gem_release_mmap(obj); + + __i915_vma_iounmap(vma); + vma->flags &= ~I915_VMA_CAN_FENCE; + } + + if (likely(!vma->vm->closed)) { + trace_i915_vma_unbind(vma); + vma->vm->unbind_vma(vma); + } + vma->flags &= ~(I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND); + + drm_mm_remove_node(&vma->node); + list_move_tail(&vma->vm_link, &vma->vm->unbound_list); + + if (vma->pages != obj->mm.pages) { + GEM_BUG_ON(!vma->pages); + sg_free_table(vma->pages); + kfree(vma->pages); + } + vma->pages = NULL; + + /* Since the unbound list is global, only move to that list if + * no more VMAs exist. */ + if (--obj->bind_count == 0) + list_move_tail(&obj->global_link, + &to_i915(obj->base.dev)->mm.unbound_list); + + /* 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. + */ + i915_gem_object_unpin_pages(obj); + +destroy: + if (unlikely(i915_vma_is_closed(vma))) + i915_vma_destroy(vma); + + return 0; +} + |