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From:   Mauro Carvalho Chehab <mchehab@kernel.org>
Cc:     Prathap Kumar Valsan <prathap.kumar.valsan@intel.com>,
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        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Matt Roper <matthew.d.roper@intel.com>,
        Matthew Auld <matthew.auld@intel.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
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        Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
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        Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>,
        Fei Yang <fei.yang@intel.com>
Subject: [PATCH v2 18/21] drm/i915: Use selective tlb invalidations where supported
Date:   Thu, 14 Jul 2022 13:06:23 +0100
Message-Id: <7d55e7971e3f4544d8edeabb9e9c645c3042e01d.1657800199.git.mchehab@kernel.org>
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From: Prathap Kumar Valsan <prathap.kumar.valsan@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.

[mchehab: change moved from intel_ppgtt.c to i915_vma.c]
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>
---

To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover.
See [PATCH v2 00/21] at: https://lore.kernel.org/all/cover.1657800199.git.mchehab@kernel.org/

 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 f764d250e929..74782fb2ccbd 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 5edc745dcc51..6d881a6b403a 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -1309,7 +1309,8 @@ 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;
@@ -1325,9 +1326,11 @@ 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(vm->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(vm->gt));
+	}
 }
 
 static void __vma_put_pages(struct i915_vma *vma, unsigned int count)
@@ -1980,7 +1983,8 @@ 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 33a58f605d75..3f0af9595e59 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -213,7 +213,8 @@ 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);
-- 
2.36.1