linux_dsm_epyc7002/drivers/gpu/drm/i915/i915_vma.c
Chris Wilson 2833ddccbd drm/i915: Be defensive when starting vma activity
Before we acquire the vma for GPU activity, ensure that the underlying
object is not already in the process of being freed.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190820100531.8430-1-chris@chris-wilson.co.uk
2019-08-20 14:23:45 +01:00

1053 lines
27 KiB
C

/*
* 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_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;
}
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->i915->ggtt.alias->vm);
vma = i915_vma_alloc();
if (vma == NULL)
return ERR_PTR(-ENOMEM);
vma->vm = 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(vm->i915, &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));
vma->flags |= I915_VMA_GGTT;
}
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);
mutex_lock(&vm->mutex);
list_add(&vma->vm_link, &vm->unbound_list);
mutex_unlock(&vm->mutex);
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.
*
* 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;
GEM_BUG_ON(view && !i915_is_ggtt(vm));
GEM_BUG_ON(vm->closed);
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;
}
/**
* 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_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 = 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->runtime_pm);
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;
intel_gt_flush_ggtt_writes(vma->vm->gt);
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, 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 (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)
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) < 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)
{
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));
mutex_lock(&vma->vm->mutex);
list_move_tail(&vma->vm_link, &vma->vm->bound_list);
mutex_unlock(&vma->vm->mutex);
if (vma->obj) {
atomic_inc(&vma->obj->bind_count);
assert_bind_count(vma->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)
{
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);
mutex_lock(&vma->vm->mutex);
drm_mm_remove_node(&vma->node);
list_move_tail(&vma->vm_link, &vma->vm->unbound_list);
mutex_unlock(&vma->vm->mutex);
/*
* 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;
atomic_dec(&obj->bind_count);
/*
* 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)
{
struct drm_i915_private *i915 = vma->vm->i915;
unsigned long flags;
GEM_BUG_ON(i915_vma_is_closed(vma));
/*
* We defer actually closing, unbinding and destroying the VMA until
* the next idle point, or if the object is freed in the meantime. By
* postponing the unbind, we allow for it to be resurrected by the
* client, avoiding the work required to rebind the VMA. This is
* advantageous for DRI, where the client/server pass objects
* between themselves, temporarily opening a local VMA to the
* object, and then closing it again. The same object is then reused
* on the next frame (or two, depending on the depth of the swap queue)
* causing us to rebind the VMA once more. This ends up being a lot
* of wasted work for the steady state.
*/
spin_lock_irqsave(&i915->gt.closed_lock, flags);
list_add(&vma->closed_link, &i915->gt.closed_vma);
spin_unlock_irqrestore(&i915->gt.closed_lock, flags);
}
static void __i915_vma_remove_closed(struct i915_vma *vma)
{
struct drm_i915_private *i915 = vma->vm->i915;
if (!i915_vma_is_closed(vma))
return;
spin_lock_irq(&i915->gt.closed_lock);
list_del_init(&vma->closed_link);
spin_unlock_irq(&i915->gt.closed_lock);
}
void i915_vma_reopen(struct i915_vma *vma)
{
__i915_vma_remove_closed(vma);
}
static void __i915_vma_destroy(struct i915_vma *vma)
{
GEM_BUG_ON(vma->node.allocated);
GEM_BUG_ON(vma->fence);
mutex_lock(&vma->vm->mutex);
list_del(&vma->vm_link);
mutex_unlock(&vma->vm->mutex);
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, &vma->obj->vma.tree);
spin_unlock(&obj->vma.lock);
}
i915_active_fini(&vma->active);
i915_vma_free(vma);
}
void i915_vma_destroy(struct i915_vma *vma)
{
lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
GEM_BUG_ON(i915_vma_is_pinned(vma));
__i915_vma_remove_closed(vma);
WARN_ON(i915_vma_unbind(vma));
GEM_BUG_ON(i915_vma_is_active(vma));
__i915_vma_destroy(vma);
}
void i915_vma_parked(struct drm_i915_private *i915)
{
struct i915_vma *vma, *next;
spin_lock_irq(&i915->gt.closed_lock);
list_for_each_entry_safe(vma, next, &i915->gt.closed_vma, closed_link) {
list_del_init(&vma->closed_link);
spin_unlock_irq(&i915->gt.closed_lock);
i915_vma_destroy(vma);
spin_lock_irq(&i915->gt.closed_lock);
}
spin_unlock_irq(&i915->gt.closed_lock);
}
static void __i915_vma_iounmap(struct i915_vma *vma)
{
GEM_BUG_ON(i915_vma_is_pinned(vma));
if (vma->iomap == NULL)
return;
io_mapping_unmap(vma->iomap);
vma->iomap = NULL;
}
void i915_vma_revoke_mmap(struct i915_vma *vma)
{
struct drm_vma_offset_node *node = &vma->obj->base.vma_node;
u64 vma_offset;
lockdep_assert_held(&vma->vm->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);
}
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_vma_held(vma);
assert_object_held(obj);
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
/*
* 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*.
*/
err = i915_active_ref(&vma->active, rq->timeline, rq);
if (unlikely(err))
return err;
if (flags & EXEC_OBJECT_WRITE) {
if (intel_frontbuffer_invalidate(obj->frontbuffer, ORIGIN_CS))
i915_active_ref(&obj->frontbuffer->write,
rq->timeline,
rq);
reservation_object_add_excl_fence(vma->resv, &rq->fence);
obj->write_domain = I915_GEM_DOMAIN_RENDER;
obj->read_domains = 0;
} else {
err = reservation_object_reserve_shared(vma->resv, 1);
if (unlikely(err))
return err;
reservation_object_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->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)) {
/*
* 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_active_wait(&vma->active);
__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;
}
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;
}