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 dead objects better.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_ggtt.c | 2 +-
drivers/gpu/drm/i915/gt/selftest_hangcheck.c | 2 +-
drivers/gpu/drm/i915/gvt/aperture_gm.c | 2 +-
drivers/gpu/drm/i915/i915_gem_evict.c | 67 +++++++++++++++++--
drivers/gpu/drm/i915/i915_gem_evict.h | 2 +
drivers/gpu/drm/i915/i915_gem_gtt.c | 8 ++-
drivers/gpu/drm/i915/i915_gem_gtt.h | 3 +
drivers/gpu/drm/i915/i915_vgpu.c | 2 +-
drivers/gpu/drm/i915/i915_vma.c | 9 +--
.../gpu/drm/i915/selftests/i915_gem_evict.c | 17 ++---
drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 6 +-
11 files changed, 91 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index a1b2761bc16e..da7f54b6fa38 100644
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -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)
diff --git a/drivers/gpu/drm/i915/gt/selftest_hangcheck.c b/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
index 4a20ba63446c..c078d3f55815 100644
--- a/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
+++ b/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
@@ -1383,7 +1383,7 @@ 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;
diff --git a/drivers/gpu/drm/i915/gvt/aperture_gm.c b/drivers/gpu/drm/i915/gvt/aperture_gm.c
index 0d6d59871308..c08098a167e9 100644
--- a/drivers/gpu/drm/i915/gvt/aperture_gm.c
+++ b/drivers/gpu/drm/i915/gvt/aperture_gm.c
@@ -63,7 +63,7 @@ static int alloc_gm(struct intel_vgpu *vgpu, bool high_gm)
mutex_lock(>->ggtt->vm.mutex);
mmio_hw_access_pre(gt);
- ret = i915_gem_gtt_insert(>->ggtt->vm, node,
+ ret = i915_gem_gtt_insert(>->ggtt->vm, NULL, node,
size, I915_GTT_PAGE_SIZE,
I915_COLOR_UNEVICTABLE,
start, end, flags);
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index 370eb7238d1c..2367902f6ac1 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -38,6 +38,11 @@ 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)
{
/*
@@ -50,8 +55,37 @@ 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)
@@ -59,6 +93,9 @@ 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);
}
@@ -105,6 +142,7 @@ static int evict_dead(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,
@@ -177,7 +215,7 @@ i915_gem_evict_something(struct i915_address_space *vm,
continue;
}
- if (mark_free(&scan, vma, flags, &eviction_list))
+ if (mark_free(&scan, ww, vma, flags, &eviction_list))
goto found;
}
@@ -185,6 +223,7 @@ i915_gem_evict_something(struct i915_address_space *vm,
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);
}
/*
@@ -229,10 +268,12 @@ i915_gem_evict_something(struct i915_address_space *vm,
* 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 */
@@ -241,16 +282,20 @@ i915_gem_evict_something(struct i915_address_space *vm,
__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;
@@ -268,6 +313,7 @@ i915_gem_evict_something(struct i915_address_space *vm,
* 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)
{
@@ -340,6 +386,11 @@ 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!
*
@@ -357,6 +408,8 @@ 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;
@@ -398,7 +451,7 @@ int i915_gem_evict_vm(struct i915_address_space *vm, struct i915_gem_ww_ctx *ww)
LIST_HEAD(locked_eviction_list);
list_for_each_entry(vma, &vm->bound_list, vm_link) {
- if (!kref_read(&vma->obj->base.refcount)) {
+ if (dying_vma(vma)) {
ret = evict_dead(vma);
if (ret)
break;
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.h b/drivers/gpu/drm/i915/i915_gem_evict.h
index f5b7a9100609..e593c530f9bd 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.h
+++ b/drivers/gpu/drm/i915/i915_gem_evict.h
@@ -13,11 +13,13 @@ struct i915_address_space;
struct i915_gem_ww_ctx;
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,
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index b7094ca48047..022543f9bf32 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -94,6 +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)
@@ -118,7 +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);
@@ -185,6 +186,7 @@ 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)
@@ -270,7 +272,7 @@ 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;
@@ -278,7 +280,7 @@ 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;
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index c9b0ee5e1d23..e4938aba3fe9 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -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);
diff --git a/drivers/gpu/drm/i915/i915_vgpu.c b/drivers/gpu/drm/i915/i915_vgpu.c
index 31a105bc1792..c97323973f9b 100644
--- a/drivers/gpu/drm/i915/i915_vgpu.c
+++ b/drivers/gpu/drm/i915/i915_vgpu.c
@@ -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)
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index 8477cae5f877..900cd4d9ebde 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -713,7 +713,8 @@ 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;
@@ -765,7 +766,7 @@ 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)
@@ -804,7 +805,7 @@ 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)
@@ -1452,7 +1453,7 @@ 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;
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_evict.c b/drivers/gpu/drm/i915/selftests/i915_gem_evict.c
index 7c075c16a573..15b4e5631070 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_evict.c
@@ -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);
@@ -132,11 +132,12 @@ 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);
mutex_unlock(&ggtt->vm.mutex);
+
