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drm/i915: Add object locking to i915_gem_evict_for_node and i915_gem_evict_something, v2. 

Because we will start to require the obj->resv lock for unbinding,
ensure these vma eviction utility functions also take the lock.

This requires some function signature changes, to ensure that the
ww context is passed around, but is mostly straightforward.

Previously this was split up into several patches, but reworking
should allow for easier bisection.

Changes since v1:
- Handle evicting dead objects better.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220114132320.109030-4-maarten.lankhorst@linux.intel.com
This commit is contained in:
Maarten Lankhorst 2022-01-14 14:23:17 +01:00
parent 6945c53bc7
commit 7e00897be8
11 changed files with 94 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/i915/gt/intel_ggtt.c
View File

@ -506,7 +506,7 @@ static int ggtt_reserve_guc_top(struct i915_ggtt *ggtt)
GEM_BUG_ON(ggtt->vm.total <= GUC_GGTT_TOP);
size = ggtt->vm.total - GUC_GGTT_TOP;
ret = i915_gem_gtt_reserve(&ggtt->vm, &ggtt->uc_fw, size,
ret = i915_gem_gtt_reserve(&ggtt->vm, NULL, &ggtt->uc_fw, size,
GUC_GGTT_TOP, I915_COLOR_UNEVICTABLE,
PIN_NOEVICT);
if (ret)

2
drivers/gpu/drm/i915/gt/selftest_hangcheck.c
View File

@ -1382,7 +1382,7 @@ static int evict_vma(void *data)
complete(&arg->completion);
mutex_lock(&vm->mutex);
err = i915_gem_evict_for_node(vm, &evict, 0);
err = i915_gem_evict_for_node(vm, NULL, &evict, 0);
mutex_unlock(&vm->mutex);
return err;

2
drivers/gpu/drm/i915/gvt/aperture_gm.c
View File

@ -63,7 +63,7 @@ static int alloc_gm(struct intel_vgpu *vgpu, bool high_gm)
mutex_lock(&gt->ggtt->vm.mutex);
mmio_hw_access_pre(gt);
ret = i915_gem_gtt_insert(&gt->ggtt->vm, node,
ret = i915_gem_gtt_insert(&gt->ggtt->vm, NULL, node,
size, I915_GTT_PAGE_SIZE,
I915_COLOR_UNEVICTABLE,
start, end, flags);

2
drivers/gpu/drm/i915/i915_drv.h
View File

@ -1735,11 +1735,13 @@ i915_gem_vm_lookup(struct drm_i915_file_private *file_priv, u32 id)
/* i915_gem_evict.c */
int __must_check i915_gem_evict_something(struct i915_address_space *vm,
struct i915_gem_ww_ctx *ww,
u64 min_size, u64 alignment,
unsigned long color,
u64 start, u64 end,
unsigned flags);
int __must_check i915_gem_evict_for_node(struct i915_address_space *vm,
struct i915_gem_ww_ctx *ww,
struct drm_mm_node *node,
unsigned int flags);
int i915_gem_evict_vm(struct i915_address_space *vm,

69
drivers/gpu/drm/i915/i915_gem_evict.c
View File

@ -37,6 +37,11 @@ I915_SELFTEST_DECLARE(static struct igt_evict_ctl {
bool fail_if_busy:1;
} igt_evict_ctl;)
static bool dying_vma(struct i915_vma *vma)
{
return !kref_read(&vma->obj->base.refcount);
}
static int ggtt_flush(struct intel_gt *gt)
{
/*
@ -49,8 +54,37 @@ static int ggtt_flush(struct intel_gt *gt)
return intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT);
}
static bool grab_vma(struct i915_vma *vma, struct i915_gem_ww_ctx *ww)
{
/*
* We add the extra refcount so the object doesn't drop to zero until
* after ungrab_vma(), this way trylock is always paired with unlock.
*/
if (i915_gem_object_get_rcu(vma->obj)) {
if (!i915_gem_object_trylock(vma->obj, ww)) {
i915_gem_object_put(vma->obj);
return false;
}
} else {
/* Dead objects don't need pins */
atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
}
return true;
}
static void ungrab_vma(struct i915_vma *vma)
{
if (dying_vma(vma))
return;
i915_gem_object_unlock(vma->obj);
i915_gem_object_put(vma->obj);
}
static bool
mark_free(struct drm_mm_scan *scan,
struct i915_gem_ww_ctx *ww,
struct i915_vma *vma,
unsigned int flags,
struct list_head *unwind)
@ -58,6 +92,9 @@ mark_free(struct drm_mm_scan *scan,
if (i915_vma_is_pinned(vma))
return false;
if (!grab_vma(vma, ww))
return false;
list_add(&vma->evict_link, unwind);
return drm_mm_scan_add_block(scan, &vma->node);
}
@ -76,6 +113,7 @@ static bool defer_evict(struct i915_vma *vma)
/**
* i915_gem_evict_something - Evict vmas to make room for binding a new one
* @vm: address space to evict from
* @ww: An optional struct i915_gem_ww_ctx.
* @min_size: size of the desired free space
* @alignment: alignment constraint of the desired free space
* @color: color for the desired space
@ -98,6 +136,7 @@ static bool defer_evict(struct i915_vma *vma)
*/
int
i915_gem_evict_something(struct i915_address_space *vm,
struct i915_gem_ww_ctx *ww,
u64 min_size, u64 alignment,
unsigned long color,
u64 start, u64 end,
@ -170,7 +209,7 @@ search_again:
continue;
}
if (mark_free(&scan, vma, flags, &eviction_list))
if (mark_free(&scan, ww, vma, flags, &eviction_list))
goto found;
}
@ -178,6 +217,7 @@ search_again:
list_for_each_entry_safe(vma, next, &eviction_list, evict_link) {
ret = drm_mm_scan_remove_block(&scan, &vma->node);
BUG_ON(ret);
ungrab_vma(vma);
}
/*
@ -222,10 +262,12 @@ found:
* of any of our objects, thus corrupting the list).
*/
list_for_each_entry_safe(vma, next, &eviction_list, evict_link) {
if (drm_mm_scan_remove_block(&scan, &vma->node))
if (drm_mm_scan_remove_block(&scan, &vma->node)) {
__i915_vma_pin(vma);
else
} else {
list_del(&vma->evict_link);
ungrab_vma(vma);
}
}
/* Unbinding will emit any required flushes */
@ -234,16 +276,20 @@ found:
__i915_vma_unpin(vma);
if (ret == 0)
ret = __i915_vma_unbind(vma);
ungrab_vma(vma);
}
while (ret == 0 && (node = drm_mm_scan_color_evict(&scan))) {
vma = container_of(node, struct i915_vma, node);
/* If we find any non-objects (!vma), we cannot evict them */
if (vma->node.color != I915_COLOR_UNEVICTABLE)
if (vma->node.color != I915_COLOR_UNEVICTABLE &&
grab_vma(vma, ww)) {
ret = __i915_vma_unbind(vma);
else
ret = -ENOSPC; /* XXX search failed, try again? */
ungrab_vma(vma);
} else {
ret = -ENOSPC;
}
}
return ret;
@ -252,6 +298,7 @@ found:
/**
* i915_gem_evict_for_node - Evict vmas to make room for binding a new one
* @vm: address space to evict from
* @ww: An optional struct i915_gem_ww_ctx.
* @target: range (and color) to evict for
* @flags: additional flags to control the eviction algorithm
*
@ -261,6 +308,7 @@ found:
* memory in e.g. the shrinker.
*/
int i915_gem_evict_for_node(struct i915_address_space *vm,
struct i915_gem_ww_ctx *ww,
struct drm_mm_node *target,
unsigned int flags)
{
@ -333,6 +381,11 @@ int i915_gem_evict_for_node(struct i915_address_space *vm,
break;
}
if (!grab_vma(vma, ww)) {
ret = -ENOSPC;
break;
}
/*
* Never show fear in the face of dragons!
*
@ -350,6 +403,8 @@ int i915_gem_evict_for_node(struct i915_address_space *vm,
__i915_vma_unpin(vma);
if (ret == 0)
ret = __i915_vma_unbind(vma);
ungrab_vma(vma);
}
return ret;
@ -401,7 +456,7 @@ int i915_gem_evict_vm(struct i915_address_space *vm, struct i915_gem_ww_ctx *ww)
* the resv is shared among multiple objects, we still
* need the object ref.
*/
if (!kref_read(&vma->obj->base.refcount) ||
if (dying_vma(vma) ||
(ww && (dma_resv_locking_ctx(vma->obj->base.resv) == &ww->ctx))) {
__i915_vma_pin(vma);
list_add(&vma->evict_link, &locked_eviction_list);

10
drivers/gpu/drm/i915/i915_gem_gtt.c
View File

@ -70,6 +70,7 @@ void i915_gem_gtt_finish_pages(struct drm_i915_gem_object *obj,
/**
* i915_gem_gtt_reserve - reserve a node in an address_space (GTT)
* @vm: the &struct i915_address_space
* @ww: An optional struct i915_gem_ww_ctx.
* @node: the &struct drm_mm_node (typically i915_vma.mode)
* @size: how much space to allocate inside the GTT,
* must be #I915_GTT_PAGE_SIZE aligned
@ -93,6 +94,7 @@ void i915_gem_gtt_finish_pages(struct drm_i915_gem_object *obj,
* asked to wait for eviction and interrupted.
*/
int i915_gem_gtt_reserve(struct i915_address_space *vm,
struct i915_gem_ww_ctx *ww,
struct drm_mm_node *node,
u64 size, u64 offset, unsigned long color,
unsigned int flags)
@ -117,7 +119,7 @@ int i915_gem_gtt_reserve(struct i915_address_space *vm,
if (flags & PIN_NOEVICT)
return -ENOSPC;
err = i915_gem_evict_for_node(vm, node, flags);
err = i915_gem_evict_for_node(vm, ww, node, flags);
if (err == 0)
err = drm_mm_reserve_node(&vm->mm, node);
@ -152,6 +154,7 @@ static u64 random_offset(u64 start, u64 end, u64 len, u64 align)
/**
* i915_gem_gtt_insert - insert a node into an address_space (GTT)
* @vm: the &struct i915_address_space
* @ww: An optional struct i915_gem_ww_ctx.
* @node: the &struct drm_mm_node (typically i915_vma.node)
* @size: how much space to allocate inside the GTT,
* must be #I915_GTT_PAGE_SIZE aligned
@ -184,6 +187,7 @@ static u64 random_offset(u64 start, u64 end, u64 len, u64 align)
* asked to wait for eviction and interrupted.
*/
int i915_gem_gtt_insert(struct i915_address_space *vm,
struct i915_gem_ww_ctx *ww,
struct drm_mm_node *node,
u64 size, u64 alignment, unsigned long color,
u64 start, u64 end, unsigned int flags)
@ -269,7 +273,7 @@ int i915_gem_gtt_insert(struct i915_address_space *vm,
*/
offset = random_offset(start, end,
size, alignment ?: I915_GTT_MIN_ALIGNMENT);
err = i915_gem_gtt_reserve(vm, node, size, offset, color, flags);
err = i915_gem_gtt_reserve(vm, ww, node, size, offset, color, flags);
if (err != -ENOSPC)
return err;
@ -277,7 +281,7 @@ int i915_gem_gtt_insert(struct i915_address_space *vm,
return -ENOSPC;
/* Randomly selected placement is pinned, do a search */
err = i915_gem_evict_something(vm, size, alignment, color,
err = i915_gem_evict_something(vm, ww, size, alignment, color,
start, end, flags);
if (err)
return err;

3
drivers/gpu/drm/i915/i915_gem_gtt.h
View File

@ -16,6 +16,7 @@
struct drm_i915_gem_object;
struct i915_address_space;
struct i915_gem_ww_ctx;
int __must_check i915_gem_gtt_prepare_pages(struct drm_i915_gem_object *obj,
struct sg_table *pages);
@ -23,11 +24,13 @@ void i915_gem_gtt_finish_pages(struct drm_i915_gem_object *obj,
struct sg_table *pages);
int i915_gem_gtt_reserve(struct i915_address_space *vm,
struct i915_gem_ww_ctx *ww,
struct drm_mm_node *node,
u64 size, u64 offset, unsigned long color,
unsigned int flags);
int i915_gem_gtt_insert(struct i915_address_space *vm,
struct i915_gem_ww_ctx *ww,
struct drm_mm_node *node,
u64 size, u64 alignment, unsigned long color,
u64 start, u64 end, unsigned int flags);

2
drivers/gpu/drm/i915/i915_vgpu.c
View File

@ -197,7 +197,7 @@ static int vgt_balloon_space(struct i915_ggtt *ggtt,
drm_info(&dev_priv->drm,
"balloon space: range [ 0x%lx - 0x%lx ] %lu KiB.\n",
start, end, size / 1024);
ret = i915_gem_gtt_reserve(&ggtt->vm, node,
ret = i915_gem_gtt_reserve(&ggtt->vm, NULL, node,
size, start, I915_COLOR_UNEVICTABLE,
0);
if (!ret)

9
drivers/gpu/drm/i915/i915_vma.c
View File

@ -712,7 +712,8 @@ bool i915_gem_valid_gtt_space(struct i915_vma *vma, unsigned long color)
* 0 on success, negative error code otherwise.
*/
static int
i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
i915_vma_insert(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
u64 size, u64 alignment, u64 flags)
{
unsigned long color;
u64 start, end;
@ -764,7 +765,7 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
range_overflows(offset, size, end))
return -EINVAL;
ret = i915_gem_gtt_reserve(vma->vm, &vma->node,
ret = i915_gem_gtt_reserve(vma->vm, ww, &vma->node,
size, offset, color,
flags);
if (ret)
@ -803,7 +804,7 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
size = round_up(size, I915_GTT_PAGE_SIZE_2M);
}
ret = i915_gem_gtt_insert(vma->vm, &vma->node,
ret = i915_gem_gtt_insert(vma->vm, ww, &vma->node,
size, alignment, color,
start, end, flags);
if (ret)
@ -1396,7 +1397,7 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
goto err_unlock;
if (!(bound & I915_VMA_BIND_MASK)) {
err = i915_vma_insert(vma, size, alignment, flags);
err = i915_vma_insert(vma, ww, size, alignment, flags);
if (err)
goto err_active;

16
drivers/gpu/drm/i915/selftests/i915_gem_evict.c
View File

@ -117,7 +117,7 @@ static int igt_evict_something(void *arg)
/* Everything is pinned, nothing should happen */
mutex_lock(&ggtt->vm.mutex);
err = i915_gem_evict_something(&ggtt->vm,
err = i915_gem_evict_something(&ggtt->vm, NULL,
I915_GTT_PAGE_SIZE, 0, 0,
0, U64_MAX,
0);
@ -132,7 +132,7 @@ static int igt_evict_something(void *arg)
/* Everything is unpinned, we should be able to evict something */
mutex_lock(&ggtt->vm.mutex);
err = i915_gem_evict_something(&ggtt->vm,
err = i915_gem_evict_something(&ggtt->vm, NULL,
I915_GTT_PAGE_SIZE, 0, 0,
0, U64_MAX,
0);
@ -204,7 +204,7 @@ static int igt_evict_for_vma(void *arg)
/* Everything is pinned, nothing should happen */
mutex_lock(&ggtt->vm.mutex);
err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
err = i915_gem_evict_for_node(&ggtt->vm, NULL, &target, 0);
mutex_unlock(&ggtt->vm.mutex);
if (err != -ENOSPC) {
pr_err("i915_gem_evict_for_node on a full GGTT returned err=%d\n",
@ -216,7 +216,7 @@ static int igt_evict_for_vma(void *arg)
/* Everything is unpinned, we should be able to evict the node */
mutex_lock(&ggtt->vm.mutex);
err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
err = i915_gem_evict_for_node(&ggtt->vm, NULL, &target, 0);
mutex_unlock(&ggtt->vm.mutex);
if (err) {
pr_err("i915_gem_evict_for_node returned err=%d\n",
@ -297,7 +297,7 @@ static int igt_evict_for_cache_color(void *arg)
/* Remove just the second vma */
mutex_lock(&ggtt->vm.mutex);
err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
err = i915_gem_evict_for_node(&ggtt->vm, NULL, &target, 0);
mutex_unlock(&ggtt->vm.mutex);
if (err) {
pr_err("[0]i915_gem_evict_for_node returned err=%d\n", err);
@ -310,7 +310,7 @@ static int igt_evict_for_cache_color(void *arg)
target.color = I915_CACHE_L3_LLC;
mutex_lock(&ggtt->vm.mutex);
err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
err = i915_gem_evict_for_node(&ggtt->vm, NULL, &target, 0);
mutex_unlock(&ggtt->vm.mutex);
if (!err) {
pr_err("[1]i915_gem_evict_for_node returned err=%d\n", err);
@ -406,7 +406,7 @@ static int igt_evict_contexts(void *arg)
/* Reserve a block so that we know we have enough to fit a few rq */
memset(&hole, 0, sizeof(hole));
mutex_lock(&ggtt->vm.mutex);
err = i915_gem_gtt_insert(&ggtt->vm, &hole,
err = i915_gem_gtt_insert(&ggtt->vm, NULL, &hole,
PRETEND_GGTT_SIZE, 0, I915_COLOR_UNEVICTABLE,
0, ggtt->vm.total,
PIN_NOEVICT);
@ -426,7 +426,7 @@ static int igt_evict_contexts(void *arg)
goto out_locked;
}
if (i915_gem_gtt_insert(&ggtt->vm, &r->node,
if (i915_gem_gtt_insert(&ggtt->vm, NULL, &r->node,
1ul << 20, 0, I915_COLOR_UNEVICTABLE,
0, ggtt->vm.total,
PIN_NOEVICT)) {

6
drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
View File

@ -1350,7 +1350,7 @@ static int reserve_gtt_with_resource(struct i915_vma *vma, u64 offset)
return PTR_ERR(vma_res);
mutex_lock(&vm->mutex);
err = i915_gem_gtt_reserve(vm, &vma->node, obj->base.size,
err = i915_gem_gtt_reserve(vm, NULL, &vma->node, obj->base.size,
offset,
obj->cache_level,
0);
@ -1531,7 +1531,7 @@ static int insert_gtt_with_resource(struct i915_vma *vma)
return PTR_ERR(vma_res);
mutex_lock(&vm->mutex);
err = i915_gem_gtt_insert(vm, &vma->node, obj->base.size, 0,
err = i915_gem_gtt_insert(vm, NULL, &vma->node, obj->base.size, 0,
obj->cache_level, 0, vm->total, 0);
if (!err) {
i915_vma_resource_init_from_vma(vma_res, vma);
@ -1587,7 +1587,7 @@ static int igt_gtt_insert(void *arg)
/* Check a couple of obviously invalid requests */
for (ii = invalid_insert; ii->size; ii++) {
mutex_lock(&ggtt->vm.mutex);
err = i915_gem_gtt_insert(&ggtt->vm, &tmp,
err = i915_gem_gtt_insert(&ggtt->vm, NULL, &tmp,
ii->size, ii->alignment,
I915_COLOR_UNEVICTABLE,
ii->start, ii->end,