[Intel-gfx] [RFC PATCH 10/10] drm/i915: Use selective tlb invalidations where supported

[Jonathan Cavitt <jonathan.cavitt@intel.com>]

For platforms supporting selective tlb invalidations, we don't need to
do a full tlb invalidation. Rather do a range based tlb invalidation for
every unbind of purged vma belongs to an active vm.

Signed-off-by: Prathap Kumar Valsan <prathap.kumar.valsan@intel.com>
Cc: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Cc: Fei Yang <fei.yang@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_ppgtt.c |  2 +-
 drivers/gpu/drm/i915/i915_vma.c       | 14 +++++++++-----
 drivers/gpu/drm/i915/i915_vma.h       |  3 ++-
 3 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_ppgtt.c b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
index d07a4f97b9434..b43dae3cbd59f 100644
--- a/drivers/gpu/drm/i915/gt/intel_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ppgtt.c
@@ -211,7 +211,7 @@ void ppgtt_unbind_vma(struct i915_address_space *vm,
 		return;
 
 	vm->clear_range(vm, vma_res->start, vma_res->vma_size);
-	vma_invalidate_tlb(vm, vma_res->tlb);
+	vma_invalidate_tlb(vm, vma_res->tlb, vma_res->start, vma_res->vma_size);
 }
 
 static unsigned long pd_count(u64 size, int shift)
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index d09aad34ba37f..cb05d794f0d0f 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -1339,7 +1339,8 @@ I915_SELFTEST_EXPORT int i915_vma_get_pages(struct i915_vma *vma)
 	return err;
 }
 
-void vma_invalidate_tlb(struct i915_address_space *vm, u32 *tlb)
+void vma_invalidate_tlb(struct i915_address_space *vm, u32 *tlb
+			u64 start, u64 size)
 {
 	struct intel_gt *gt;
 	int id;
@@ -1355,9 +1356,11 @@ void vma_invalidate_tlb(struct i915_address_space *vm, u32 *tlb)
 	 * the most recent TLB invalidation seqno, and if we have not yet
 	 * flushed the TLBs upon release, perform a full invalidation.
 	 */
-	for_each_gt(gt, vm->i915, id)
-		WRITE_ONCE(tlb[id],
-			   intel_gt_next_invalidate_tlb_full(gt));
+	for_each_gt(gt, vm->i915, id) {
+		if (!intel_gt_invalidate_tlb_range(gt, start, size))
+			WRITE_ONCE(tlb[id],
+				   intel_gt_next_invalidate_tlb_full(gt));
+	}
 }
 
 static void __vma_put_pages(struct i915_vma *vma, unsigned int count)
@@ -2041,7 +2044,8 @@ struct dma_fence *__i915_vma_evict(struct i915_vma *vma, bool async)
 			dma_fence_put(unbind_fence);
 			unbind_fence = NULL;
 		}
-		vma_invalidate_tlb(vma->vm, vma->obj->mm.tlb);
+		vma_invalidate_tlb(vma->vm, vma->obj->mm.tlb,
+				   vma->node.start, vma->size);
 	}
 
 	/*
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index e356dfb883d34..5a604aad55dfe 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -260,7 +260,8 @@ bool i915_vma_misplaced(const struct i915_vma *vma,
 			u64 size, u64 alignment, u64 flags);
 void __i915_vma_set_map_and_fenceable(struct i915_vma *vma);
 void i915_vma_revoke_mmap(struct i915_vma *vma);
-void vma_invalidate_tlb(struct i915_address_space *vm, u32 *tlb);
+void vma_invalidate_tlb(struct i915_address_space *vm, u32 *tlb,
+			u64 start, u64 size);
 struct dma_fence *__i915_vma_evict(struct i915_vma *vma, bool async);
 int __i915_vma_unbind(struct i915_vma *vma);
 int __must_check i915_vma_unbind(struct i915_vma *vma);
-- 
2.25.1