/*
* 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>
#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[12];
struct stack_trace trace = {
.entries = entries,
.max_entries = ARRAY_SIZE(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;
}
depot_fetch_stack(vma->node.stack, &trace);
snprint_stack_trace(buf, sizeof(buf), &trace, 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
struct i915_vma_active {
struct i915_gem_active base;
struct i915_vma *vma;
struct rb_node node;
u64 timeline;
};
static void
__i915_vma_retire(struct i915_vma *vma, struct i915_request *rq)
{
struct drm_i915_gem_object *obj = vma->obj;
GEM_BUG_ON(!i915_vma_is_active(vma));
if (--vma->active_count)
return;
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
GEM_BUG_ON(!i915_gem_object_is_active(obj));
if (--obj->active_count)
return;
/* Prune the shared fence arrays iff completely idle (inc. external) */
if (reservation_object_trylock(obj->resv)) {
if (reservation_object_test_signaled_rcu(obj->resv, true))
reservation_object_add_excl_fence(obj->resv, NULL);
reservation_object_unlock(obj->resv);
}
/* 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!)
*/
spin_lock(&rq->i915->mm.obj_lock);
if (obj->bind_count)
list_move_tail(&obj->mm.link, &rq->i915->mm.bound_list);
spin_unlock(&rq->i915->mm.obj_lock);
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 void
i915_vma_retire(struct i915_gem_active *base, struct i915_request *rq)
{
struct i915_vma_active *active =
container_of(base, typeof(*active), base);
__i915_vma_retire(active->vma, rq);
}
static void
i915_vma_last_retire(struct i915_gem_active *base, struct i915_request *rq)
{
__i915_vma_retire(container_of(base, struct i915_vma, last_active), rq);
}
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->i915->mm.aliasing_ppgtt->vm);
vma = kmem_cache_zalloc(vm->i915->vmas, GFP_KERNEL);
if (vma == NULL)
return ERR_PTR(-ENOMEM);
vma->active = RB_ROOT;
init_request_active(&vma->last_active, i915_vma_last_retire);
init_request_active(&vma->last_fence, NULL);
vma->vm = vm;
vma->ops = &vm->vma_ops;
vma->obj = obj;
vma->resv = obj->resv;
vma->size = obj->base.size;
vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
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;
}
}
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));
/*
* 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()
*/
vma->flags |= I915_VMA_GGTT;
list_add(&vma->obj_link, &obj->vma_list);
} else {
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);
list_add(&vma->vm_link, &vm->unbound_list);
return vma;
err_vma:
kmem_cache_free(vm->i915->vmas, 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.
*
* Must be called with struct_mutex held.
*
* 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;
lockdep_assert_held(&obj->base.dev->struct_mutex);
GEM_BUG_ON(view && !i915_is_ggtt(vm));
GEM_BUG_ON(vm->closed);
vma = vma_lookup(obj, vm, view);
if (!vma)
vma = vma_create(obj, vm, view);
GEM_BUG_ON(!IS_ERR(vma) && i915_vma_compare(vma, vm, view));
GEM_BUG_ON(!IS_ERR(vma) && vma_lookup(obj, vm, view) != vma);
return vma;
}
/**
* 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;
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
GEM_BUG_ON(vma->size > vma->node.size);
if (GEM_WARN_ON(range_overflows(vma->node.start,
vma->node.size,
vma->vm->total)))
return -ENODEV;
if (GEM_WARN_ON(!flags))
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;
GEM_BUG_ON(!vma->pages);
trace_i915_vma_bind(vma, bind_flags);
ret = vma->ops->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;
int err;
/* Access through the GTT requires the device to be awake. */
assert_rpm_wakelock_held(vma->vm->i915);
lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
if (WARN_ON(!i915_vma_is_map_and_fenceable(vma))) {
err = -ENODEV;
goto err;
}
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)->iomap,
vma->node.start,
vma->node.size);
if (ptr == NULL) {
err = -ENOMEM;
goto err;
}
vma->iomap = ptr;
}
__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_has_ggtt_write(vma))
return;
i915_gem_flush_ggtt_writes(vma->vm->i915);
i915_vma_unset_ggtt_write(vma);
}
void i915_vma_unpin_iomap(struct i915_vma *vma)
{
lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
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)
{
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);
__i915_gem_object_release_unless_active(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 (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);
/*
* Explicitly disable for rotated VMA since the display does not
* need the fence and the VMA is not accessible to other users.
*/
if (vma->ggtt_view.type == I915_GGTT_VIEW_ROTATED)
return;
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)
vma->flags |= I915_VMA_CAN_FENCE;
else
vma->flags &= ~I915_VMA_CAN_FENCE;
}
static bool color_differs(struct drm_mm_node *node, unsigned long color)
{
return node->allocated && node->color != color;
}
bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long cache_level)
{
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 (vma->vm->mm.color_adjust == NULL)
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 (color_differs(other, cache_level) && !drm_mm_hole_follows(other))
return false;
other = list_next_entry(node, node_list);
if (color_differs(other, cache_level) && !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) < 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)
{
struct drm_i915_private *dev_priv = vma->vm->i915;
unsigned int cache_level;
u64 start, end;
int ret;
GEM_BUG_ON(i915_vma_is_closed(vma));
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);
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, dev_priv->ggtt.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;
}
if (vma->obj) {
ret = i915_gem_object_pin_pages(vma->obj);
if (ret)
return ret;
cache_level = vma->obj->cache_level;
} else {
cache_level = 0;
}
GEM_BUG_ON(vma->pages);
ret = vma->ops->set_pages(vma);
if (ret)
goto err_unpin;
if (flags & PIN_OFFSET_FIXED) {
u64 offset = flags & PIN_OFFSET_MASK;
if (!IS_ALIGNED(offset, alignment) ||
range_overflows(offset, size, end)) {
ret = -EINVAL;
goto err_clear;
}
ret = i915_gem_gtt_reserve(vma->vm, &vma->node,
size, offset, cache_level,
flags);
if (ret)
goto err_clear;
} 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, cache_level,
start, end, flags);
if (ret)
goto err_clear;
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, cache_level));
list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
if (vma->obj) {
struct drm_i915_gem_object *obj = vma->obj;
spin_lock(&dev_priv->mm.obj_lock);
list_move_tail(&obj->mm.link, &dev_priv->mm.bound_list);
obj->bind_count++;
spin_unlock(&dev_priv->mm.obj_lock);
assert_bind_count(obj);
}
return 0;
err_clear:
vma->ops->clear_pages(vma);
err_unpin:
if (vma->obj)
i915_gem_object_unpin_pages(vma->obj);
return ret;
}
static void
i915_vma_remove(struct i915_vma *vma)
{
struct drm_i915_private *i915 = vma->vm->i915;
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
GEM_BUG_ON(vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
vma->ops->clear_pages(vma);
drm_mm_remove_node(&vma->node);
list_move_tail(&vma->vm_link, &vma->vm->unbound_list);
/*
* 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;
spin_lock(&i915->mm.obj_lock);
if (--obj->bind_count == 0)
list_move_tail(&obj->mm.link, &i915->mm.unbound_list);
spin_unlock(&i915->mm.obj_lock);
/*
* 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);
assert_bind_count(obj);
}
}
int __i915_vma_do_pin(struct i915_vma *vma,
u64 size, u64 alignment, u64 flags)
{
const unsigned int bound = vma->flags;
int ret;
lockdep_assert_held(&vma->vm->i915->drm.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_unpin;
}
if ((bound & I915_VMA_BIND_MASK) == 0) {
ret = i915_vma_insert(vma, size, alignment, flags);
if (ret)
goto err_unpin;
}
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
ret = i915_vma_bind(vma, vma->obj ? vma->obj->cache_level : 0, flags);
if (ret)
goto err_remove;
GEM_BUG_ON((vma->flags & I915_VMA_BIND_MASK) == 0);
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_remove:
if ((bound & I915_VMA_BIND_MASK) == 0) {
i915_vma_remove(vma);
GEM_BUG_ON(vma->pages);
GEM_BUG_ON(vma->flags & I915_VMA_BIND_MASK);
}
err_unpin:
__i915_vma_unpin(vma);
return ret;
}
void i915_vma_close(struct i915_vma *vma)
{
lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
GEM_BUG_ON(i915_vma_is_closed(vma));
vma->flags |= I915_VMA_CLOSED;
/*
* 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.
*/
list_add_tail(&vma->closed_link, &vma->vm->i915->gt.closed_vma);
}
void i915_vma_reopen(struct i915_vma *vma)
{
lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
if (vma->flags & I915_VMA_CLOSED) {
vma->flags &= ~I915_VMA_CLOSED;
list_del(&vma->closed_link);
}
}
static void __i915_vma_destroy(struct i915_vma *vma)
{
struct drm_i915_private *i915 = vma->vm->i915;
struct i915_vma_active *iter, *n;
GEM_BUG_ON(vma->node.allocated);
GEM_BUG_ON(vma->fence);
GEM_BUG_ON(i915_gem_active_isset(&vma->last_fence));
list_del(&vma->obj_link);
list_del(&vma->vm_link);
if (vma->obj)
rb_erase(&vma->obj_node, &vma->obj->vma_tree);
rbtree_postorder_for_each_entry_safe(iter, n, &vma->active, node) {
GEM_BUG_ON(i915_gem_active_isset(&iter->base));
kfree(iter);
}
kmem_cache_free(i915->vmas, vma);
}
void i915_vma_destroy(struct i915_vma *vma)
{
lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
GEM_BUG_ON(i915_vma_is_active(vma));
GEM_BUG_ON(i915_vma_is_pinned(vma));
if (i915_vma_is_closed(vma))
list_del(&vma->closed_link);
WARN_ON(i915_vma_unbind(vma));
__i915_vma_destroy(vma);
}
void i915_vma_parked(struct drm_i915_private *i915)
{
struct i915_vma *vma, *next;
list_for_each_entry_safe(vma, next, &i915->gt.closed_vma, closed_link) {
GEM_BUG_ON(!i915_vma_is_closed(vma));
i915_vma_destroy(vma);
}
GEM_BUG_ON(!list_empty(&i915->gt.closed_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;
}
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->i915->drm.struct_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);
}
static void export_fence(struct i915_vma *vma,
struct i915_request *rq,
unsigned int flags)
{
struct reservation_object *resv = vma->resv;
/*
* Ignore errors from failing to allocate the new fence, we can't
* handle an error right now. Worst case should be missed
* synchronisation leading to rendering corruption.
*/
reservation_object_lock(resv, NULL);
if (flags & EXEC_OBJECT_WRITE)
reservation_object_add_excl_fence(resv, &rq->fence);
else if (reservation_object_reserve_shared(resv) == 0)
reservation_object_add_shared_fence(resv, &rq->fence);
reservation_object_unlock(resv);
}
static struct i915_gem_active *active_instance(struct i915_vma *vma, u64 idx)
{
struct i915_vma_active *active;
struct rb_node **p, *parent;
struct i915_request *old;
/*
* We track the most recently used timeline to skip a rbtree search
* for the common case, under typical loads we never need the rbtree
* at all. We can reuse the last_active slot if it is empty, that is
* after the previous activity has been retired, or if the active
* matches the current timeline.
*
* Note that we allow the timeline to be active simultaneously in
* the rbtree and the last_active cache. We do this to avoid having
* to search and replace the rbtree element for a new timeline, with
* the cost being that we must be aware that the vma may be retired
* twice for the same timeline (as the older rbtree element will be
* retired before the new request added to last_active).
*/
old = i915_gem_active_raw(&vma->last_active,
&vma->vm->i915->drm.struct_mutex);
if (!old || old->fence.context == idx)
goto out;
/* Move the currently active fence into the rbtree */
idx = old->fence.context;
parent = NULL;
p = &vma->active.rb_node;
while (*p) {
parent = *p;
active = rb_entry(parent, struct i915_vma_active, node);
if (active->timeline == idx)
goto replace;
if (active->timeline < idx)
p = &parent->rb_right;
else
p = &parent->rb_left;
}
active = kmalloc(sizeof(*active), GFP_KERNEL);
/* kmalloc may retire the vma->last_active request (thanks shrinker)! */
if (unlikely(!i915_gem_active_raw(&vma->last_active,
&vma->vm->i915->drm.struct_mutex))) {
kfree(active);
goto out;
}
if (unlikely(!active))
return ERR_PTR(-ENOMEM);
init_request_active(&active->base, i915_vma_retire);
active->vma = vma;
active->timeline = idx;
rb_link_node(&active->node, parent, p);
rb_insert_color(&active->node, &vma->active);
replace:
/*
* Overwrite the previous active slot in the rbtree with last_active,
* leaving last_active zeroed. If the previous slot is still active,
* we must be careful as we now only expect to receive one retire
* callback not two, and so much undo the active counting for the
* overwritten slot.
*/
if (i915_gem_active_isset(&active->base)) {
/* Retire ourselves from the old rq->active_list */
__list_del_entry(&active->base.link);
vma->active_count--;
GEM_BUG_ON(!vma->active_count);
}
GEM_BUG_ON(list_empty(&vma->last_active.link));
list_replace_init(&vma->last_active.link, &active->base.link);
active->base.request = fetch_and_zero(&vma->last_active.request);
out:
return &vma->last_active;
}
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;
struct i915_gem_active *active;
lockdep_assert_held(&rq->i915->drm.struct_mutex);
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
active = active_instance(vma, rq->fence.context);
if (IS_ERR(active))
return PTR_ERR(active);
/*
* Add a reference if we're newly entering the active list.
* The order in which we add operations to the retirement queue is
* vital here: mark_active adds to the start of the callback list,
* such that subsequent callbacks are called first. Therefore we
* add the active reference first and queue for it to be dropped
* *last*.
*/
if (!i915_gem_active_isset(active) && !vma->active_count++) {
list_move_tail(&vma->vm_link, &vma->vm->active_list);
obj->active_count++;
}
i915_gem_active_set(active, rq);
GEM_BUG_ON(!i915_vma_is_active(vma));
GEM_BUG_ON(!obj->active_count);
obj->write_domain = 0;
if (flags & EXEC_OBJECT_WRITE) {
obj->write_domain = I915_GEM_DOMAIN_RENDER;
if (intel_fb_obj_invalidate(obj, ORIGIN_CS))
i915_gem_active_set(&obj->frontbuffer_write, rq);
obj->read_domains = 0;
}
obj->read_domains |= I915_GEM_GPU_DOMAINS;
if (flags & EXEC_OBJECT_NEEDS_FENCE)
i915_gem_active_set(&vma->last_fence, rq);
export_fence(vma, rq, flags);
return 0;
}
int i915_vma_unbind(struct i915_vma *vma)
{
int ret;
lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
/*
* First wait upon any activity as retiring the request may
* have side-effects such as unpinning or even unbinding this vma.
*/
might_sleep();
if (i915_vma_is_active(vma)) {
struct i915_vma_active *active, *n;
/*
* 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);
ret = i915_gem_active_retire(&vma->last_active,
&vma->vm->i915->drm.struct_mutex);
if (ret)
goto unpin;
rbtree_postorder_for_each_entry_safe(active, n,
&vma->active, node) {
ret = i915_gem_active_retire(&active->base,
&vma->vm->i915->drm.struct_mutex);
if (ret)
goto unpin;
}
ret = i915_gem_active_retire(&vma->last_fence,
&vma->vm->i915->drm.struct_mutex);
unpin:
__i915_vma_unpin(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;
}
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_put_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);
vma->flags &= ~I915_VMA_CAN_FENCE;
}
GEM_BUG_ON(vma->fence);
GEM_BUG_ON(i915_vma_has_userfault(vma));
if (likely(!vma->vm->closed)) {
trace_i915_vma_unbind(vma);
vma->ops->unbind_vma(vma);
}
vma->flags &= ~(I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND);
i915_vma_remove(vma);
return 0;
}
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/i915_vma.c"
#endif
