diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
index 28144410df86..2be6109d0093 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
@@ -252,6 +252,9 @@ static void __i915_gem_free_objects(struct drm_i915_private *i915,
if (obj->mm.n_placements > 1)
kfree(obj->mm.placements);
+ if (obj->shares_resv_from)
+ i915_vm_resv_put(obj->shares_resv_from);
+
/* But keep the pointer alive for RCU-protected lookups */
call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
cond_resched();
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index 0727d0c76aa0..0415f99b6b95 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -149,6 +149,10 @@ struct drm_i915_gem_object {
* when i915_gem_ww_ctx_backoff() or i915_gem_ww_ctx_fini() are called.
*/
struct list_head obj_link;
+ /**
+ * @shared_resv_from: The object shares the resv from this vm.
+ */
+ struct i915_address_space *shares_resv_from;
union {
struct rcu_head rcu;
diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index dcb3b299cf4a..efcd5aeac936 100644
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -745,7 +745,6 @@ static void ggtt_cleanup_hw(struct i915_ggtt *ggtt)
mutex_unlock(&ggtt->vm.mutex);
i915_address_space_fini(&ggtt->vm);
- dma_resv_fini(&ggtt->vm.resv);
arch_phys_wc_del(ggtt->mtrr);
@@ -767,6 +766,19 @@ void i915_ggtt_driver_release(struct drm_i915_private *i915)
ggtt_cleanup_hw(ggtt);
}
+/**
+ * i915_ggtt_driver_late_release - Cleanup of GGTT that needs to be done after
+ * all free objects have been drained.
+ * @i915: i915 device
+ */
+void i915_ggtt_driver_late_release(struct drm_i915_private *i915)
+{
+ struct i915_ggtt *ggtt = &i915->ggtt;
+
+ GEM_WARN_ON(kref_read(&ggtt->vm.resv_ref) != 1);
+ dma_resv_fini(&ggtt->vm._resv);
+}
+
static unsigned int gen6_get_total_gtt_size(u16 snb_gmch_ctl)
{
snb_gmch_ctl >>= SNB_GMCH_GGMS_SHIFT;
@@ -828,6 +840,7 @@ static int ggtt_probe_common(struct i915_ggtt *ggtt, u64 size)
return -ENOMEM;
}
+ kref_init(&ggtt->vm.resv_ref);
ret = setup_scratch_page(&ggtt->vm);
if (ret) {
drm_err(&i915->drm, "Scratch setup failed\n");
@@ -1134,7 +1147,7 @@ static int ggtt_probe_hw(struct i915_ggtt *ggtt, struct intel_gt *gt)
ggtt->vm.gt = gt;
ggtt->vm.i915 = i915;
ggtt->vm.dma = i915->drm.dev;
- dma_resv_init(&ggtt->vm.resv);
+ dma_resv_init(&ggtt->vm._resv);
if (INTEL_GEN(i915) <= 5)
ret = i915_gmch_probe(ggtt);
@@ -1143,7 +1156,7 @@ static int ggtt_probe_hw(struct i915_ggtt *ggtt, struct intel_gt *gt)
else
ret = gen8_gmch_probe(ggtt);
if (ret) {
- dma_resv_fini(&ggtt->vm.resv);
+ dma_resv_fini(&ggtt->vm._resv);
return ret;
}
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
index 9b98f9d9faa3..94849567143d 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
@@ -22,8 +22,11 @@ struct drm_i915_gem_object *alloc_pt_lmem(struct i915_address_space *vm, int sz)
* object underneath, with the idea that one object_lock() will lock
* them all at once.
*/
- if (!IS_ERR(obj))
- obj->base.resv = &vm->resv;
+ if (!IS_ERR(obj)) {
+ obj->base.resv = i915_vm_resv_get(vm);
+ obj->shares_resv_from = vm;
+ }
+
return obj;
}
@@ -40,8 +43,11 @@ struct drm_i915_gem_object *alloc_pt_dma(struct i915_address_space *vm, int sz)
* object underneath, with the idea that one object_lock() will lock
* them all at once.
*/
- if (!IS_ERR(obj))
- obj->base.resv = &vm->resv;
+ if (!IS_ERR(obj)) {
+ obj->base.resv = i915_vm_resv_get(vm);
+ obj->shares_resv_from = vm;
+ }
+
return obj;
}
@@ -102,7 +108,7 @@ void __i915_vm_close(struct i915_address_space *vm)
int i915_vm_lock_objects(struct i915_address_space *vm,
struct i915_gem_ww_ctx *ww)
{
- if (vm->scratch[0]->base.resv == &vm->resv) {
+ if (vm->scratch[0]->base.resv == &vm->_resv) {
return i915_gem_object_lock(vm->scratch[0], ww);
} else {
struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
@@ -118,6 +124,22 @@ void i915_address_space_fini(struct i915_address_space *vm)
mutex_destroy(&vm->mutex);
}
+/**
+ * i915_vm_resv_release - Final struct i915_address_space destructor
+ * @kref: Pointer to the &i915_address_space.resv_ref member.
+ *
+ * This function is called when the last lock sharer no longer shares the
+ * &i915_address_space._resv lock.
+ */
+void i915_vm_resv_release(struct kref *kref)
+{
+ struct i915_address_space *vm =
+ container_of(kref, typeof(*vm), resv_ref);
+
+ dma_resv_fini(&vm->_resv);
+ kfree(vm);
+}
+
static void __i915_vm_release(struct work_struct *work)
{
struct i915_address_space *vm =
@@ -125,9 +147,8 @@ static void __i915_vm_release(struct work_struct *work)
vm->cleanup(vm);
i915_address_space_fini(vm);
- dma_resv_fini(&vm->resv);
- kfree(vm);
+ i915_vm_resv_put(vm);
}
void i915_vm_release(struct kref *kref)
@@ -144,6 +165,14 @@ void i915_vm_release(struct kref *kref)
void i915_address_space_init(struct i915_address_space *vm, int subclass)
{
kref_init(&vm->ref);
+
+ /*
+ * Special case for GGTT that has already done an early
+ * kref_init here.
+ */
+ if (!kref_read(&vm->resv_ref))
+ kref_init(&vm->resv_ref);
+
INIT_RCU_WORK(&vm->rcu, __i915_vm_release);
atomic_set(&vm->open, 1);
@@ -170,7 +199,7 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass)
might_alloc(GFP_KERNEL);
mutex_release(&vm->mutex.dep_map, _THIS_IP_);
}
- dma_resv_init(&vm->resv);
+ dma_resv_init(&vm->_resv);
GEM_BUG_ON(!vm->total);
drm_mm_init(&vm->mm, 0, vm->total);
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index 44ce27c51631..86879af7b4a9 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -245,7 +245,9 @@ struct i915_address_space {
atomic_t open;
struct mutex mutex; /* protects vma and our lists */
- struct dma_resv resv; /* reservation lock for all pd objects, and buffer pool */
+
+ struct kref resv_ref; /* kref to keep the reservation lock alive. */
+ struct dma_resv _resv; /* reservation lock for all pd objects, and buffer pool */
#define VM_CLASS_GGTT 0
#define VM_CLASS_PPGTT 1
@@ -399,13 +401,36 @@ i915_vm_get(struct i915_address_space *vm)
return vm;
}
+/**
+ * i915_vm_resv_get - Obtain a reference on the vm's reservation lock
+ * @vm: The vm whose reservation lock we want to share.
+ *
+ * Return: A pointer to the vm's reservation lock.
+ */
+static inline struct dma_resv *i915_vm_resv_get(struct i915_address_space *vm)
+{
+ kref_get(&vm->resv_ref);
+ return &vm->_resv;
+}
+
void i915_vm_release(struct kref *kref);
+void i915_vm_resv_release(struct kref *kref);
+
static inline void i915_vm_put(struct i915_address_space *vm)
{
kref_put(&vm->ref, i915_vm_release);
}
+/**
+ * i915_vm_resv_put - Release a reference on the vm's reservation lock
+ * @resv: Pointer to a reservation lock obtained from i915_vm_resv_get()
+ */
+static inline void i915_vm_resv_put(struct i915_address_space *vm)
+{
+ kref_put(&vm->resv_ref, i915_vm_resv_release);
+}
+
static inline struct i915_address_space *
i915_vm_open(struct i915_address_space *vm)
{
@@ -501,6 +526,7 @@ void i915_ggtt_enable_guc(struct i915_ggtt *ggtt);
void i915_ggtt_disable_guc(struct i915_ggtt *ggtt);
int i915_init_ggtt(struct drm_i915_private *i915);
void i915_ggtt_driver_release(struct drm_i915_private *i915);
+void i915_ggtt_driver_late_release(struct drm_i915_private *i915);
static inline bool i915_ggtt_has_aperture(const struct i915_ggtt *ggtt)
{
diff --git a/drivers/gpu/drm/i915/gt/intel_ppgtt.c b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
index 4e3d80c2295c..aee3a8929245 100644
--- a/drivers/gpu/drm/i915/gt/intel_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
@@ -307,7 +307,7 @@ void ppgtt_init(struct i915_ppgtt *ppgtt, struct intel_gt *gt)
ppgtt->vm.dma = i915->drm.dev;
ppgtt->vm.total = BIT_ULL(INTEL_INFO(i915)->ppgtt_size);
- dma_resv_init(&ppgtt->vm.resv);
+ dma_resv_init(&ppgtt->vm._resv);
i915_address_space_init(&ppgtt->vm, VM_CLASS_PPGTT);
ppgtt->vm.vma_ops.bind_vma = ppgtt_bind_vma;
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index f50f7b4ff541..2db9d8f59eef 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -630,6 +630,8 @@ err_mem_regions:
intel_memory_regions_driver_release(dev_priv);
err_ggtt:
i915_ggtt_driver_release(dev_priv);
+ i915_gem_drain_freed_objects(dev_priv);
+ i915_ggtt_driver_late_release(dev_priv);
err_perf:
i915_perf_fini(dev_priv);
return ret;
@@ -880,6 +882,8 @@ out_cleanup_hw:
i915_driver_hw_remove(i915);
intel_memory_regions_driver_release(i915);
i915_ggtt_driver_release(i915);
+ i915_gem_drain_freed_objects(i915);
+ i915_ggtt_driver_late_release(i915);
out_cleanup_mmio:
i915_driver_mmio_release(i915);
out_runtime_pm_put:
@@ -936,6 +940,7 @@ static void i915_driver_release(struct drm_device *dev)
intel_memory_regions_driver_release(dev_priv);
i915_ggtt_driver_release(dev_priv);
i915_gem_drain_freed_objects(dev_priv);
+ i915_ggtt_driver_late_release(dev_priv);
i915_driver_mmio_release(dev_priv);