Re: [PATCH v2 2/2] drm/xe: Invalidate media_gt TLBs in PT code

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Am 26.08.24 um 19:01 schrieb Matthew Brost:
Testing on LNL has shown media GT's TLBs need to be invalidated via the
GuC, update PT code appropriately.

v2:
  - Do dma_fence_get before first call of invalidation_fence_init (Himal)
  - No need to check for valid chain fence (Himal)
v3:
  - Use dma-fence-array

Fixes: 3330361543fc ("drm/xe/lnl: Add LNL platform definition")
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>

Acked-by: Christian König <christian.koenig@xxxxxxx>

---
  drivers/gpu/drm/xe/xe_pt.c | 117 ++++++++++++++++++++++++++++++-------
  1 file changed, 96 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_pt.c b/drivers/gpu/drm/xe/xe_pt.c
index 579ed31b46db..d6353e8969f0 100644
--- a/drivers/gpu/drm/xe/xe_pt.c
+++ b/drivers/gpu/drm/xe/xe_pt.c
@@ -3,6 +3,8 @@
   * Copyright © 2022 Intel Corporation
   */
+#include <linux/dma-fence-array.h>
+
  #include "xe_pt.h"
#include "regs/xe_gtt_defs.h"
@@ -1627,9 +1629,11 @@ xe_pt_update_ops_rfence_interval(struct xe_vm_pgtable_update_ops *pt_update_ops,
static int vma_reserve_fences(struct xe_device *xe, struct xe_vma *vma)
  {
+	int shift = xe_device_get_root_tile(xe)->media_gt ? 1 : 0;
+
  	if (!xe_vma_has_no_bo(vma) && !xe_vma_bo(vma)->vm)
  		return dma_resv_reserve_fences(xe_vma_bo(vma)->ttm.base.resv,
-					       xe->info.tile_count);
+					       xe->info.tile_count << shift);
return 0;
  }
@@ -1816,6 +1820,7 @@ int xe_pt_update_ops_prepare(struct xe_tile *tile, struct xe_vma_ops *vops)
  	struct xe_vm_pgtable_update_ops *pt_update_ops =
  		&vops->pt_update_ops[tile->id];
  	struct xe_vma_op *op;
+	int shift = tile->media_gt ? 1 : 0;
  	int err;
lockdep_assert_held(&vops->vm->lock);
@@ -1824,7 +1829,7 @@ int xe_pt_update_ops_prepare(struct xe_tile *tile, struct xe_vma_ops *vops)
  	xe_pt_update_ops_init(pt_update_ops);
err = dma_resv_reserve_fences(xe_vm_resv(vops->vm),
-				      tile_to_xe(tile)->info.tile_count);
+				      tile_to_xe(tile)->info.tile_count << shift);
  	if (err)
  		return err;
@@ -1849,13 +1854,20 @@ int xe_pt_update_ops_prepare(struct xe_tile *tile, struct xe_vma_ops *vops) static void bind_op_commit(struct xe_vm *vm, struct xe_tile *tile,
  			   struct xe_vm_pgtable_update_ops *pt_update_ops,
-			   struct xe_vma *vma, struct dma_fence *fence)
+			   struct xe_vma *vma, struct dma_fence *fence,
+			   struct dma_fence *fence2)
  {
-	if (!xe_vma_has_no_bo(vma) && !xe_vma_bo(vma)->vm)
+	if (!xe_vma_has_no_bo(vma) && !xe_vma_bo(vma)->vm) {
  		dma_resv_add_fence(xe_vma_bo(vma)->ttm.base.resv, fence,
  				   pt_update_ops->wait_vm_bookkeep ?
  				   DMA_RESV_USAGE_KERNEL :
  				   DMA_RESV_USAGE_BOOKKEEP);
+		if (fence2)
+			dma_resv_add_fence(xe_vma_bo(vma)->ttm.base.resv, fence2,
+					   pt_update_ops->wait_vm_bookkeep ?
+					   DMA_RESV_USAGE_KERNEL :
+					   DMA_RESV_USAGE_BOOKKEEP);
+	}
  	vma->tile_present |= BIT(tile->id);
  	vma->tile_staged &= ~BIT(tile->id);
  	if (xe_vma_is_userptr(vma)) {
@@ -1875,13 +1887,20 @@ static void bind_op_commit(struct xe_vm *vm, struct xe_tile *tile,
static void unbind_op_commit(struct xe_vm *vm, struct xe_tile *tile,
  			     struct xe_vm_pgtable_update_ops *pt_update_ops,
-			     struct xe_vma *vma, struct dma_fence *fence)
+			     struct xe_vma *vma, struct dma_fence *fence,
+			     struct dma_fence *fence2)
  {
-	if (!xe_vma_has_no_bo(vma) && !xe_vma_bo(vma)->vm)
+	if (!xe_vma_has_no_bo(vma) && !xe_vma_bo(vma)->vm) {
  		dma_resv_add_fence(xe_vma_bo(vma)->ttm.base.resv, fence,
  				   pt_update_ops->wait_vm_bookkeep ?
  				   DMA_RESV_USAGE_KERNEL :
  				   DMA_RESV_USAGE_BOOKKEEP);
+		if (fence2)
+			dma_resv_add_fence(xe_vma_bo(vma)->ttm.base.resv, fence2,
+					   pt_update_ops->wait_vm_bookkeep ?
+					   DMA_RESV_USAGE_KERNEL :
+					   DMA_RESV_USAGE_BOOKKEEP);
+	}
  	vma->tile_present &= ~BIT(tile->id);
  	if (!vma->tile_present) {
  		list_del_init(&vma->combined_links.rebind);
@@ -1898,7 +1917,8 @@ static void unbind_op_commit(struct xe_vm *vm, struct xe_tile *tile,
  static void op_commit(struct xe_vm *vm,
  		      struct xe_tile *tile,
  		      struct xe_vm_pgtable_update_ops *pt_update_ops,
-		      struct xe_vma_op *op, struct dma_fence *fence)
+		      struct xe_vma_op *op, struct dma_fence *fence,
+		      struct dma_fence *fence2)
  {
  	xe_vm_assert_held(vm);
@@ -1907,26 +1927,28 @@ static void op_commit(struct xe_vm *vm,
  		if (!op->map.immediate && xe_vm_in_fault_mode(vm))
  			break;
- bind_op_commit(vm, tile, pt_update_ops, op->map.vma, fence);
+		bind_op_commit(vm, tile, pt_update_ops, op->map.vma, fence,
+			       fence2);
  		break;
  	case DRM_GPUVA_OP_REMAP:
  		unbind_op_commit(vm, tile, pt_update_ops,
-				 gpuva_to_vma(op->base.remap.unmap->va), fence);
+				 gpuva_to_vma(op->base.remap.unmap->va), fence,
+				 fence2);
if (op->remap.prev)
  			bind_op_commit(vm, tile, pt_update_ops, op->remap.prev,
-				       fence);
+				       fence, fence2);
  		if (op->remap.next)
  			bind_op_commit(vm, tile, pt_update_ops, op->remap.next,
-				       fence);
+				       fence, fence2);
  		break;
  	case DRM_GPUVA_OP_UNMAP:
  		unbind_op_commit(vm, tile, pt_update_ops,
-				 gpuva_to_vma(op->base.unmap.va), fence);
+				 gpuva_to_vma(op->base.unmap.va), fence, fence2);
  		break;
  	case DRM_GPUVA_OP_PREFETCH:
  		bind_op_commit(vm, tile, pt_update_ops,
-			       gpuva_to_vma(op->base.prefetch.va), fence);
+			       gpuva_to_vma(op->base.prefetch.va), fence, fence2);
  		break;
  	default:
  		drm_warn(&vm->xe->drm, "NOT POSSIBLE");
@@ -1963,7 +1985,9 @@ xe_pt_update_ops_run(struct xe_tile *tile, struct xe_vma_ops *vops)
  	struct xe_vm_pgtable_update_ops *pt_update_ops =
  		&vops->pt_update_ops[tile->id];
  	struct dma_fence *fence;
-	struct invalidation_fence *ifence = NULL;
+	struct invalidation_fence *ifence = NULL, *mfence = NULL;
+	struct dma_fence **fences = NULL;
+	struct dma_fence_array *cf = NULL;
  	struct xe_range_fence *rfence;
  	struct xe_vma_op *op;
  	int err = 0, i;
@@ -1996,6 +2020,23 @@ xe_pt_update_ops_run(struct xe_tile *tile, struct xe_vma_ops *vops)
  			err = -ENOMEM;
  			goto kill_vm_tile1;
  		}
+		if (tile->media_gt) {
+			mfence = kzalloc(sizeof(*ifence), GFP_KERNEL);
+			if (!mfence) {
+				err = -ENOMEM;
+				goto free_ifence;
+			}
+			fences = kmalloc_array(2, sizeof(*fences), GFP_KERNEL);
+			if (!fences) {
+				err = -ENOMEM;
+				goto free_ifence;
+			}
+			cf = dma_fence_array_alloc(2);
+			if (!cf) {
+				err = -ENOMEM;
+				goto free_ifence;
+			}
+		}
  	}
rfence = kzalloc(sizeof(*rfence), GFP_KERNEL);
@@ -2027,19 +2068,50 @@ xe_pt_update_ops_run(struct xe_tile *tile, struct xe_vma_ops *vops)
/* tlb invalidation must be done before signaling rebind */
  	if (ifence) {
+		if (mfence)
+			dma_fence_get(fence);
  		invalidation_fence_init(tile->primary_gt, ifence, fence,
  					pt_update_ops->start,
  					pt_update_ops->last, vm->usm.asid);
-		fence = &ifence->base.base;
+		if (mfence) {
+			invalidation_fence_init(tile->media_gt, mfence, fence,
+						pt_update_ops->start,
+						pt_update_ops->last, vm->usm.asid);
+			fences[0] = &ifence->base.base;
+			fences[1] = &mfence->base.base;
+			dma_fence_array_init(cf, 2, fences,
+					     vm->composite_fence_ctx,
+					     vm->composite_fence_seqno++,
+					     false);
+			fence = &cf->base;
+		} else {
+			fence = &ifence->base.base;
+		}
  	}
- dma_resv_add_fence(xe_vm_resv(vm), fence,
-			   pt_update_ops->wait_vm_bookkeep ?
-			   DMA_RESV_USAGE_KERNEL :
-			   DMA_RESV_USAGE_BOOKKEEP);
+	if (!mfence) {
+		dma_resv_add_fence(xe_vm_resv(vm), fence,
+				   pt_update_ops->wait_vm_bookkeep ?
+				   DMA_RESV_USAGE_KERNEL :
+				   DMA_RESV_USAGE_BOOKKEEP);
- list_for_each_entry(op, &vops->list, link)
-		op_commit(vops->vm, tile, pt_update_ops, op, fence);
+		list_for_each_entry(op, &vops->list, link)
+			op_commit(vops->vm, tile, pt_update_ops, op, fence, NULL);
+	} else {
+		dma_resv_add_fence(xe_vm_resv(vm), &ifence->base.base,
+				   pt_update_ops->wait_vm_bookkeep ?
+				   DMA_RESV_USAGE_KERNEL :
+				   DMA_RESV_USAGE_BOOKKEEP);
+
+		dma_resv_add_fence(xe_vm_resv(vm), &mfence->base.base,
+				   pt_update_ops->wait_vm_bookkeep ?
+				   DMA_RESV_USAGE_KERNEL :
+				   DMA_RESV_USAGE_BOOKKEEP);
+
+		list_for_each_entry(op, &vops->list, link)
+			op_commit(vops->vm, tile, pt_update_ops, op,
+				  &ifence->base.base, &mfence->base.base);
+	}
if (pt_update_ops->needs_userptr_lock)
  		up_read(&vm->userptr.notifier_lock);
@@ -2049,6 +2121,9 @@ xe_pt_update_ops_run(struct xe_tile *tile, struct xe_vma_ops *vops)
  free_rfence:
  	kfree(rfence);
  free_ifence:
+	kfree(cf);
+	kfree(fences);
+	kfree(mfence);
  	kfree(ifence);
  kill_vm_tile1:
  	if (err != -EAGAIN && tile->id)





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