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From f9263854415cb857cef239b6d6ae5f05066e4731 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sun, 22 Dec 2019 21:02:55 +0000
Subject: [PATCH 10/11] drm/i915: Introduce a vma.kref
Start introducing a kref on i915_vma in order to protect the vma unbind
(i915_gem_object_unbind) from a parallel destruction (i915_vma_parked).
Later, we will use the refcount to manage all access and turn i915_vma
into a first class container.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Imre Deak <imre.deak@intel.com>
Acked-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191222210256.2066451-2-chris@chris-wilson.co.uk
---
drivers/gpu/drm/i915/gem/i915_gem_object.c | 2 +-
.../gpu/drm/i915/gem/selftests/huge_pages.c | 3 +--
.../drm/i915/gem/selftests/i915_gem_mman.c | 4 +--
drivers/gpu/drm/i915/i915_gem.c | 27 +++++++------------
drivers/gpu/drm/i915/i915_gem_gtt.c | 5 ++--
drivers/gpu/drm/i915/i915_vma.c | 9 ++++---
drivers/gpu/drm/i915/i915_vma.h | 25 ++++++++++++++---
7 files changed, 44 insertions(+), 31 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
index a596548c07bf..b6937469ffd3 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
@@ -174,7 +174,7 @@ static void __i915_gem_free_objects(struct drm_i915_private *i915,
GEM_BUG_ON(vma->obj != obj);
spin_unlock(&obj->vma.lock);
- i915_vma_destroy(vma);
+ __i915_vma_put(vma);
spin_lock(&obj->vma.lock);
}
diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
index 688c49a24f32..bd1e2c12de63 100644
--- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
+++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
@@ -1110,8 +1110,7 @@ static int __igt_write_huge(struct intel_context *ce,
out_vma_unpin:
i915_vma_unpin(vma);
out_vma_close:
- i915_vma_destroy(vma);
-
+ __i915_vma_put(vma);
return err;
}
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
index e81c2726f7fd..3d8f00d40d42 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
@@ -161,7 +161,7 @@ static int check_partial_mapping(struct drm_i915_gem_object *obj,
kunmap(p);
out:
- i915_vma_destroy(vma);
+ __i915_vma_put(vma);
return err;
}
@@ -255,7 +255,7 @@ static int check_partial_mappings(struct drm_i915_gem_object *obj,
if (err)
return err;
- i915_vma_destroy(vma);
+ __i915_vma_put(vma);
if (igt_timeout(end_time,
"%s: timed out after tiling=%d stride=%d\n",
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 83eed642cbcd..0475a0343487 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -143,7 +143,6 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
struct i915_vma,
obj_link))) {
struct i915_address_space *vm = vma->vm;
- bool awake = false;
list_move_tail(&vma->obj_link, &still_in_list);
if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK))
@@ -154,26 +153,18 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
break;
/* Prevent vma being freed by i915_vma_parked as we unbind */
- if (intel_gt_pm_get_if_awake(vm->gt)) {
- awake = true;
- } else {
- if (i915_vma_is_closed(vma)) {
- spin_unlock(&obj->vma.lock);
- i915_vma_parked(vm->gt);
- goto err_vm;
- }
- }
-
+ vma = __i915_vma_get(vma);
spin_unlock(&obj->vma.lock);
- ret = -EBUSY;
- if (flags & I915_GEM_OBJECT_UNBIND_ACTIVE ||
- !i915_vma_is_active(vma))
- ret = i915_vma_unbind(vma);
+ if (vma) {
+ ret = -EBUSY;
+ if (flags & I915_GEM_OBJECT_UNBIND_ACTIVE ||
+ !i915_vma_is_active(vma))
+ ret = i915_vma_unbind(vma);
+
+ __i915_vma_put(vma);
+ }
- if (awake)
- intel_gt_pm_put(vm->gt);
-err_vm:
i915_vm_close(vm);
spin_lock(&obj->vma.lock);
}
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 44727806dfd7..dd2c20f7d4d2 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -522,7 +522,7 @@ void __i915_vm_close(struct i915_address_space *vm)
atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
WARN_ON(__i915_vma_unbind(vma));
- i915_vma_destroy(vma);
+ __i915_vma_put(vma);
i915_gem_object_put(obj);
}
@@ -1790,7 +1790,7 @@ static void gen6_ppgtt_cleanup(struct i915_address_space *vm)
{
struct gen6_ppgtt *ppgtt = to_gen6_ppgtt(i915_vm_to_ppgtt(vm));
- i915_vma_destroy(ppgtt->vma);
+ __i915_vma_put(ppgtt->vma);
gen6_ppgtt_free_pd(ppgtt);
free_scratch(vm);
@@ -1878,6 +1878,7 @@ static struct i915_vma *pd_vma_create(struct gen6_ppgtt *ppgtt, int size)
i915_active_init(&vma->active, NULL, NULL);
+ kref_init(&vma->ref);
mutex_init(&vma->pages_mutex);
vma->vm = i915_vm_get(&ggtt->vm);
vma->ops = &pd_vma_ops;
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index 01c822256b39..00973017abba 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -112,6 +112,7 @@ vma_create(struct drm_i915_gem_object *obj,
if (vma == NULL)
return ERR_PTR(-ENOMEM);
+ kref_init(&vma->ref);
mutex_init(&vma->pages_mutex);
vma->vm = i915_vm_get(vm);
vma->ops = &vm->vma_ops;
@@ -978,8 +979,10 @@ void i915_vma_reopen(struct i915_vma *vma)
__i915_vma_remove_closed(vma);
}
-void i915_vma_destroy(struct i915_vma *vma)
+void i915_vma_release(struct kref *ref)
{
+ struct i915_vma *vma = container_of(ref, typeof(*vma), ref);
+
if (drm_mm_node_allocated(&vma->node)) {
mutex_lock(&vma->vm->mutex);
atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
@@ -1027,7 +1030,7 @@ void i915_vma_parked(struct intel_gt *gt)
spin_unlock_irq(>->closed_lock);
if (obj) {
- i915_vma_destroy(vma);
+ __i915_vma_put(vma);
i915_gem_object_put(obj);
}
@@ -1192,7 +1195,7 @@ int __i915_vma_unbind(struct i915_vma *vma)
i915_vma_detach(vma);
vma_unbind_pages(vma);
- drm_mm_remove_node(&vma->node); /* pairs with i915_vma_destroy() */
+ drm_mm_remove_node(&vma->node); /* pairs with i915_vma_release() */
return 0;
}
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index 465932813bc5..ce1db908ad69 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -51,14 +51,19 @@ enum i915_cache_level;
*/
struct i915_vma {
struct drm_mm_node node;
- struct drm_i915_gem_object *obj;
+
struct i915_address_space *vm;
const struct i915_vma_ops *ops;
- struct i915_fence_reg *fence;
+
+ struct drm_i915_gem_object *obj;
struct dma_resv *resv; /** Alias of obj->resv */
+
struct sg_table *pages;
void __iomem *iomap;
void *private; /* owned by creator */
+
+ struct i915_fence_reg *fence;
+
u64 size;
u64 display_alignment;
struct i915_page_sizes page_sizes;
@@ -71,6 +76,7 @@ struct i915_vma {
* handles (but same file) for execbuf, i.e. the number of aliases
* that exist in the ctx->handle_vmas LUT for this vma.
*/
+ struct kref ref;
atomic_t open_count;
atomic_t flags;
/**
@@ -333,7 +339,20 @@ int __must_check i915_vma_unbind(struct i915_vma *vma);
void i915_vma_unlink_ctx(struct i915_vma *vma);
void i915_vma_close(struct i915_vma *vma);
void i915_vma_reopen(struct i915_vma *vma);
-void i915_vma_destroy(struct i915_vma *vma);
+
+static inline struct i915_vma *__i915_vma_get(struct i915_vma *vma)
+{
+ if (kref_get_unless_zero(&vma->ref))
+ return vma;
+
+ return NULL;
+}
+
+void i915_vma_release(struct kref *ref);
+static inline void __i915_vma_put(struct i915_vma *vma)
+{
+ kref_put(&vma->ref, i915_vma_release);
+}
#define assert_vma_held(vma) dma_resv_assert_held((vma)->resv)
--
2.25.2
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