[Intel-gfx] [PATCH] drm/i915: Only set bind_async_flags when concurrent access wa is not active, v2.

[Maarten Lankhorst]

We need to make the BSW workaround actually work. We correctly fixed
the mutex nesting, but forgot to kill the worker.

The worker is killed by clearing async_flags, and just running bind_vma
synchronously. This still needs the stash, because we cannot allocate
and pin with vm->mutex already held.

Changes since v1:
- Fix null pointer dereference when we forget to pass the work stash,
  it's still required to prealloc all on affected platforms.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/i915/gt/gen6_ppgtt.c | 4 +++-
 drivers/gpu/drm/i915/gt/gen8_ppgtt.c | 4 +++-
 drivers/gpu/drm/i915/i915_vma.c      | 4 ++--
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
index 1aee5e6b1b23..de3aa79b788e 100644
--- a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
@@ -433,7 +433,9 @@ struct i915_ppgtt *gen6_ppgtt_create(struct intel_gt *gt)
 	ppgtt->base.vm.pd_shift = ilog2(SZ_4K * SZ_4K / sizeof(gen6_pte_t));
 	ppgtt->base.vm.top = 1;
 
-	ppgtt->base.vm.bind_async_flags = I915_VMA_LOCAL_BIND;
+	if (!intel_vm_no_concurrent_access_wa(gt->i915))
+		ppgtt->base.vm.bind_async_flags = I915_VMA_LOCAL_BIND;
+
 	ppgtt->base.vm.allocate_va_range = gen6_alloc_va_range;
 	ppgtt->base.vm.clear_range = gen6_ppgtt_clear_range;
 	ppgtt->base.vm.insert_entries = gen6_ppgtt_insert_entries;
diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
index e3a8924d2286..aa58b0e48ae1 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.c
@@ -732,7 +732,9 @@ struct i915_ppgtt *gen8_ppgtt_create(struct intel_gt *gt)
 			goto err_free_pd;
 	}
 
-	ppgtt->vm.bind_async_flags = I915_VMA_LOCAL_BIND;
+	if (!intel_vm_no_concurrent_access_wa(gt->i915))
+		ppgtt->vm.bind_async_flags = I915_VMA_LOCAL_BIND;
+
 	ppgtt->vm.insert_entries = gen8_ppgtt_insert;
 	ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc;
 	ppgtt->vm.clear_range = gen8_ppgtt_clear;
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index b319fd3f91cc..d550ee911e68 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -436,7 +436,7 @@ int i915_vma_bind(struct i915_vma *vma,
 			work->pinned = i915_gem_object_get(vma->obj);
 		}
 	} else {
-		vma->ops->bind_vma(vma->vm, NULL, vma, cache_level, bind_flags);
+		vma->ops->bind_vma(vma->vm, work ? &work->stash : NULL, vma, cache_level, bind_flags);
 	}
 
 	atomic_or(bind_flags, &vma->flags);
@@ -895,7 +895,7 @@ int i915_vma_pin_ww(struct i915_vma *vma, struct i915_gem_ww_ctx *ww,
 	if (flags & PIN_GLOBAL)
 		wakeref = intel_runtime_pm_get(&vma->vm->i915->runtime_pm);
 
-	if (flags & vma->vm->bind_async_flags) {
+	if ((flags & vma->vm->bind_async_flags) || vma->vm->allocate_va_range) {
 		/* lock VM */
 		err = i915_vm_lock_objects(vma->vm, ww);
 		if (err)
-- 
2.31.0