[PATCH 07/16] drm/i915/vm_bind: Add support to handle object evictions
Matthew Auld
matthew.auld at intel.com
Thu Sep 29 17:13:02 UTC 2022
On 28/09/2022 07:19, Niranjana Vishwanathapura wrote:
> Support eviction by maintaining a list of evicted persistent vmas
> for rebinding during next submission. Ensure the list do not
> include persistent vmas that are being purged.
>
> Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
> Signed-off-by: Andi Shyti <andi.shyti at linux.intel.com>
Acked-by: Matthew Auld <matthew.auld at intel.com>
> ---
> .../drm/i915/gem/i915_gem_vm_bind_object.c | 6 ++++++
> drivers/gpu/drm/i915/gt/intel_gtt.c | 2 ++
> drivers/gpu/drm/i915/gt/intel_gtt.h | 4 ++++
> drivers/gpu/drm/i915/i915_vma.c | 19 +++++++++++++++++++
> drivers/gpu/drm/i915/i915_vma.h | 10 ++++++++++
> drivers/gpu/drm/i915/i915_vma_types.h | 10 ++++++++++
> 6 files changed, 51 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
> index 809c78455d2e..958139ed6da3 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
> @@ -85,6 +85,12 @@ static void i915_gem_vm_bind_remove(struct i915_vma *vma, bool release_obj)
> {
> lockdep_assert_held(&vma->vm->vm_bind_lock);
>
> + spin_lock(&vma->vm->vm_rebind_lock);
> + if (!list_empty(&vma->vm_rebind_link))
> + list_del_init(&vma->vm_rebind_link);
> + i915_vma_set_purged(vma);
> + spin_unlock(&vma->vm->vm_rebind_lock);
> +
> list_del_init(&vma->vm_bind_link);
> list_del_init(&vma->non_priv_vm_bind_link);
> i915_vm_bind_it_remove(vma, &vma->vm->va);
> diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
> index da4f9dee0397..6db31197fa87 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gtt.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
> @@ -296,6 +296,8 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass)
> INIT_LIST_HEAD(&vm->non_priv_vm_bind_list);
> vm->root_obj = i915_gem_object_create_internal(vm->i915, PAGE_SIZE);
> GEM_BUG_ON(IS_ERR(vm->root_obj));
> + INIT_LIST_HEAD(&vm->vm_rebind_list);
> + spin_lock_init(&vm->vm_rebind_lock);
> }
>
> void *__px_vaddr(struct drm_i915_gem_object *p)
> diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
> index 3f2e87d3bf34..b73d35b4e05d 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gtt.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
> @@ -273,6 +273,10 @@ struct i915_address_space {
> struct list_head vm_bind_list;
> /** @vm_bound_list: List of vm_binding completed */
> struct list_head vm_bound_list;
> + /* @vm_rebind_list: list of vmas to be rebinded */
> + struct list_head vm_rebind_list;
> + /* @vm_rebind_lock: protects vm_rebound_list */
> + spinlock_t vm_rebind_lock;
> /* @va: tree of persistent vmas */
> struct rb_root_cached va;
> struct list_head non_priv_vm_bind_list;
> diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
> index 89c276163916..84ed3d1a17a6 100644
> --- a/drivers/gpu/drm/i915/i915_vma.c
> +++ b/drivers/gpu/drm/i915/i915_vma.c
> @@ -241,6 +241,7 @@ vma_create(struct drm_i915_gem_object *obj,
>
> INIT_LIST_HEAD(&vma->vm_bind_link);
> INIT_LIST_HEAD(&vma->non_priv_vm_bind_link);
> + INIT_LIST_HEAD(&vma->vm_rebind_link);
> return vma;
>
> err_unlock:
> @@ -1686,6 +1687,14 @@ static void force_unbind(struct i915_vma *vma)
> if (!drm_mm_node_allocated(&vma->node))
> return;
>
> + /*
> + * Persistent vma should have been purged by now.
> + * If not, issue a warning and purge it.
> + */
> + if (GEM_WARN_ON(i915_vma_is_persistent(vma) &&
> + !i915_vma_is_purged(vma)))
> + i915_vma_set_purged(vma);
> +
> atomic_and(~I915_VMA_PIN_MASK, &vma->flags);
> WARN_ON(__i915_vma_unbind(vma));
> GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
> @@ -2048,6 +2057,16 @@ int __i915_vma_unbind(struct i915_vma *vma)
> __i915_vma_evict(vma, false);
>
> drm_mm_remove_node(&vma->node); /* pairs with i915_vma_release() */
> +
> + if (i915_vma_is_persistent(vma)) {
> + spin_lock(&vma->vm->vm_rebind_lock);
> + if (list_empty(&vma->vm_rebind_link) &&
> + !i915_vma_is_purged(vma))
> + list_add_tail(&vma->vm_rebind_link,
> + &vma->vm->vm_rebind_list);
> + spin_unlock(&vma->vm->vm_rebind_lock);
> + }
> +
> return 0;
> }
>
> diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
> index 51e712de380a..48731855b5b0 100644
> --- a/drivers/gpu/drm/i915/i915_vma.h
> +++ b/drivers/gpu/drm/i915/i915_vma.h
> @@ -152,6 +152,16 @@ static inline void i915_vma_set_persistent(struct i915_vma *vma)
> set_bit(I915_VMA_PERSISTENT_BIT, __i915_vma_flags(vma));
> }
>
> +static inline bool i915_vma_is_purged(const struct i915_vma *vma)
> +{
> + return test_bit(I915_VMA_PURGED_BIT, __i915_vma_flags(vma));
> +}
> +
> +static inline void i915_vma_set_purged(struct i915_vma *vma)
> +{
> + set_bit(I915_VMA_PURGED_BIT, __i915_vma_flags(vma));
> +}
> +
> static inline struct i915_vma *i915_vma_get(struct i915_vma *vma)
> {
> i915_gem_object_get(vma->obj);
> diff --git a/drivers/gpu/drm/i915/i915_vma_types.h b/drivers/gpu/drm/i915/i915_vma_types.h
> index 3d5ffc3e666b..75b8af608ddb 100644
> --- a/drivers/gpu/drm/i915/i915_vma_types.h
> +++ b/drivers/gpu/drm/i915/i915_vma_types.h
> @@ -267,9 +267,17 @@ struct i915_vma {
> /**
> * I915_VMA_PERSISTENT_BIT:
> * The vma is persistent (created with VM_BIND call).
> + *
> + * I915_VMA_PURGED_BIT:
> + * The persistent vma is force unbound either due to VM_UNBIND call
> + * from UMD or VM is released. Do not check/wait for VM activeness
> + * in i915_vma_is_active() and i915_vma_sync() calls.
> */
> #define I915_VMA_PERSISTENT_BIT 19
> +#define I915_VMA_PURGED_BIT 20
> +
> #define I915_VMA_PERSISTENT ((int)BIT(I915_VMA_PERSISTENT_BIT))
> +#define I915_VMA_PURGED ((int)BIT(I915_VMA_PURGED_BIT))
>
> struct i915_active active;
>
> @@ -300,6 +308,8 @@ struct i915_vma {
> struct list_head vm_bind_link;
> /* @non_priv_vm_bind_link: Link in non-private persistent VMA list */
> struct list_head non_priv_vm_bind_link;
> + /* @vm_rebind_link: link to vm_rebind_list and protected by vm_rebind_lock */
> + struct list_head vm_rebind_link; /* Link in vm_rebind_list */
>
> /** Interval tree structures for persistent vma */
>
More information about the dri-devel
mailing list