On Thu, Oct 20, 2022 at 05:29:45PM +0100, Matthew Auld wrote:
On 18/10/2022 08:16, Niranjana Vishwanathapura wrote:For persistent (vm_bind) vmas of userptr BOs, handle the user page pinning by using the i915_gem_object_userptr_submit_init() /done() functions v2: Do not double add vma to vm->userptr_invalidated_list Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@xxxxxxxxx> Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx> --- .../gpu/drm/i915/gem/i915_gem_execbuffer3.c | 80 +++++++++++++++++++ drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 19 +++++ .../drm/i915/gem/i915_gem_vm_bind_object.c | 15 ++++ drivers/gpu/drm/i915/gt/intel_gtt.c | 2 + drivers/gpu/drm/i915/gt/intel_gtt.h | 4 + drivers/gpu/drm/i915/i915_vma_types.h | 2 + 6 files changed, 122 insertions(+) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer3.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer3.c index 8120e4c6b7da..3f1157dd7fc2 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer3.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer3.c @@ -20,6 +20,7 @@ #include "i915_gem_vm_bind.h" #include "i915_trace.h" +#define __EXEC3_USERPTR_USED BIT_ULL(34) #define __EXEC3_HAS_PIN BIT_ULL(33) #define __EXEC3_ENGINE_PINNED BIT_ULL(32) #define __EXEC3_INTERNAL_FLAGS (~0ull << 32) @@ -142,6 +143,21 @@ static void eb_scoop_unbound_vma_all(struct i915_address_space *vm) { struct i915_vma *vma, *vn; +#ifdef CONFIG_MMU_NOTIFIER + /**Not proper kernel-doc AFAIK.
Ok, will use single asterisk above.
+ * Move all invalidated userptr vmas back into vm_bind_list so that + * they are looked up and revalidated. + */ + spin_lock(&vm->userptr_invalidated_lock); + list_for_each_entry_safe(vma, vn, &vm->userptr_invalidated_list, + userptr_invalidated_link) { + list_del_init(&vma->userptr_invalidated_link); + if (!list_empty(&vma->vm_bind_link)) + list_move_tail(&vma->vm_bind_link, &vm->vm_bind_list); + } + spin_unlock(&vm->userptr_invalidated_lock); +#endif + /** * Move all unbound vmas back into vm_bind_list so that they are * revalidated. @@ -155,10 +171,47 @@ static void eb_scoop_unbound_vma_all(struct i915_address_space *vm) spin_unlock(&vm->vm_rebind_lock); } +static int eb_lookup_persistent_userptr_vmas(struct i915_execbuffer *eb) +{ + struct i915_address_space *vm = eb->context->vm; + struct i915_vma *last_vma = NULL; + struct i915_vma *vma; + int err; + + lockdep_assert_held(&vm->vm_bind_lock); + + list_for_each_entry(vma, &vm->vm_bind_list, vm_bind_link) { + if (!i915_gem_object_is_userptr(vma->obj)) + continue; + + err = i915_gem_object_userptr_submit_init(vma->obj); + if (err) + return err; + + /** + * The above submit_init() call does the object unbind and + * hence adds vma into vm_rebind_list. Remove it from that + * list as it is already scooped for revalidation. + */Ditto.
ok
+ spin_lock(&vm->vm_rebind_lock); + if (!list_empty(&vma->vm_rebind_link)) + list_del_init(&vma->vm_rebind_link); + spin_unlock(&vm->vm_rebind_lock); + + last_vma = vma; + } + + if (last_vma) + eb->args->flags |= __EXEC3_USERPTR_USED; + + return 0; +} + static int eb_lookup_vma_all(struct i915_execbuffer *eb) { unsigned int i, current_batch = 0; struct i915_vma *vma; + int err = 0; for (i = 0; i < eb->num_batches; i++) { vma = eb_find_vma(eb->context->vm, eb->batch_addresses[i]); @@ -171,6 +224,10 @@ static int eb_lookup_vma_all(struct i915_execbuffer *eb) eb_scoop_unbound_vma_all(eb->context->vm); + err = eb_lookup_persistent_userptr_vmas(eb); + if (err) + return err; + return 0; } @@ -343,6 +400,29 @@ static int eb_move_to_gpu(struct i915_execbuffer *eb) } } +#ifdef CONFIG_MMU_NOTIFIER + /* Check for further userptr invalidations */ + spin_lock(&vm->userptr_invalidated_lock); + if (!list_empty(&vm->userptr_invalidated_list)) + err = -EAGAIN; + spin_unlock(&vm->userptr_invalidated_lock);After dropping the lock here, the invalidated_list might no longer be empty? Is that not possible, or somehow not a concern?
It should be fine as we have already added the fence to dma-resv object above. Any subsequent mmu invalidations will end up waiting for request to finish (similar to case where mmu invalidation gets called after request is submitted).
+ + if (!err && (eb->args->flags & __EXEC3_USERPTR_USED)) { + read_lock(&eb->i915->mm.notifier_lock); + list_for_each_entry(vma, &vm->vm_bind_list, vm_bind_link) { + if (!i915_gem_object_is_userptr(vma->obj)) + continue; + + err = i915_gem_object_userptr_submit_done(vma->obj); + if (err) + break; + } + read_unlock(&eb->i915->mm.notifier_lock); + } +#endif + if (unlikely(err)) + goto err_skip; + /* Unconditionally flush any chipset caches (for streaming writes). */ intel_gt_chipset_flush(eb->gt); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c index b7e24476a0fd..3e88fd4d46b6 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c @@ -63,6 +63,7 @@ static bool i915_gem_userptr_invalidate(struct mmu_interval_notifier *mni, { struct drm_i915_gem_object *obj = container_of(mni, struct drm_i915_gem_object, userptr.notifier); struct drm_i915_private *i915 = to_i915(obj->base.dev); + struct i915_vma *vma; long r; if (!mmu_notifier_range_blockable(range)) @@ -85,6 +86,24 @@ static bool i915_gem_userptr_invalidate(struct mmu_interval_notifier *mni, if (current->flags & PF_EXITING) return true; + /** + * Add persistent vmas into userptr_invalidated list for relookup + * and revalidation. + */Ditto.
Ok Thanks, Niranjana
+ spin_lock(&obj->vma.lock); + list_for_each_entry(vma, &obj->vma.list, obj_link) { + if (!i915_vma_is_persistent(vma)) + continue; + + spin_lock(&vma->vm->userptr_invalidated_lock); + if (list_empty(&vma->userptr_invalidated_link) && + !i915_vma_is_purged(vma)) + list_add_tail(&vma->userptr_invalidated_link, + &vma->vm->userptr_invalidated_list); + spin_unlock(&vma->vm->userptr_invalidated_lock); + } + spin_unlock(&obj->vma.lock); + /* we will unbind on next submission, still have userptr pins */ r = dma_resv_wait_timeout(obj->base.resv, DMA_RESV_USAGE_BOOKKEEP, false, MAX_SCHEDULE_TIMEOUT); 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 63889ba00183..19071493355c 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 @@ -299,6 +299,12 @@ static int i915_gem_vm_bind_obj(struct i915_address_space *vm, goto put_obj; } + if (i915_gem_object_is_userptr(obj)) { + ret = i915_gem_object_userptr_submit_init(obj); + if (ret) + goto put_obj; + } + ret = mutex_lock_interruptible(&vm->vm_bind_lock); if (ret) goto put_obj; @@ -327,6 +333,15 @@ static int i915_gem_vm_bind_obj(struct i915_address_space *vm, if (ret) continue; +#ifdef CONFIG_MMU_NOTIFIER + if (i915_gem_object_is_userptr(obj)) { + read_lock(&vm->i915->mm.notifier_lock); + ret = i915_gem_object_userptr_submit_done(obj); + read_unlock(&vm->i915->mm.notifier_lock); + if (ret) + continue; + } +#endif list_add_tail(&vma->vm_bind_link, &vm->vm_bound_list); i915_vm_bind_it_insert(vma, &vm->va); if (!obj->priv_root) diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c index ebf8fc3a4603..50648ab9214a 100644 --- a/drivers/gpu/drm/i915/gt/intel_gtt.c +++ b/drivers/gpu/drm/i915/gt/intel_gtt.c @@ -292,6 +292,8 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass) INIT_LIST_HEAD(&vm->non_priv_vm_bind_list); INIT_LIST_HEAD(&vm->vm_rebind_list); spin_lock_init(&vm->vm_rebind_lock); + spin_lock_init(&vm->userptr_invalidated_lock); + INIT_LIST_HEAD(&vm->userptr_invalidated_list); } 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 384d1ee7c68d..1ade95b2a0fa 100644 --- a/drivers/gpu/drm/i915/gt/intel_gtt.h +++ b/drivers/gpu/drm/i915/gt/intel_gtt.h @@ -270,6 +270,10 @@ struct i915_address_space { struct list_head vm_rebind_list; /* @vm_rebind_lock: protects vm_rebound_list */ spinlock_t vm_rebind_lock; + /* @userptr_invalidated_list: list of invalidated userptr vmas */ + struct list_head userptr_invalidated_list; + /* @userptr_invalidated_lock: protects userptr_invalidated_list */ + spinlock_t userptr_invalidated_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_types.h b/drivers/gpu/drm/i915/i915_vma_types.h index 2c740500ac1b..8e562e07d4a7 100644 --- a/drivers/gpu/drm/i915/i915_vma_types.h +++ b/drivers/gpu/drm/i915/i915_vma_types.h @@ -307,6 +307,8 @@ struct i915_vma { 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 */ + /*@userptr_invalidated_link: link to the vm->userptr_invalidated_list */ + struct list_head userptr_invalidated_link; /** Timeline fence for vm_bind completion notification */ struct {
