[PATCH v2] drm/amdkfd: optimize memory mapping latency

Eric Huang jinhuieric.huang at amd.com
Tue Jun 1 18:50:26 UTC 2021


1. conditionally flush TLBs after map.
2. add heavy weight TLBs flushing after unmap.

Signed-off-by: Eric Huang <jinhuieric.huang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h    |  2 +-
 .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c  | 21 ++++++++++-----
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h    |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c        |  2 +-
 drivers/gpu/drm/amd/amdkfd/kfd_chardev.c      | 27 +++++++++++--------
 .../drm/amd/amdkfd/kfd_device_queue_manager.c |  6 ++---
 drivers/gpu/drm/amd/amdkfd/kfd_priv.h         |  2 +-
 drivers/gpu/drm/amd/amdkfd/kfd_process.c      |  7 ++---
 8 files changed, 41 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
index 2560977760b3..8f2d6711e12f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -280,7 +280,7 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
 		struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv,
 		uint64_t *size);
 int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
-		struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv);
+		struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv, bool *flush_tlb);
 int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
 		struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv);
 int amdgpu_amdkfd_gpuvm_sync_memory(
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 1fcfa172911a..14c8e23c68b9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -1117,7 +1117,8 @@ static void unmap_bo_from_gpuvm(struct kgd_mem *mem,
 
 static int update_gpuvm_pte(struct kgd_mem *mem,
 			    struct kfd_mem_attachment *entry,
-			    struct amdgpu_sync *sync)
+			    struct amdgpu_sync *sync,
+			    bool *flush_tlb)
 {
 	struct amdgpu_bo_va *bo_va = entry->bo_va;
 	struct amdgpu_device *adev = entry->adev;
@@ -1127,6 +1128,7 @@ static int update_gpuvm_pte(struct kgd_mem *mem,
 	if (ret)
 		return ret;
 
+	bo_va->table_freed = false;
 	/* Update the page tables  */
 	ret = amdgpu_vm_bo_update(adev, bo_va, false);
 	if (ret) {
@@ -1134,13 +1136,17 @@ static int update_gpuvm_pte(struct kgd_mem *mem,
 		return ret;
 	}
 
+	if (flush_tlb)
+		*flush_tlb = *flush_tlb || bo_va->table_freed;
+
 	return amdgpu_sync_fence(sync, bo_va->last_pt_update);
 }
 
 static int map_bo_to_gpuvm(struct kgd_mem *mem,
 			   struct kfd_mem_attachment *entry,
 			   struct amdgpu_sync *sync,
-			   bool no_update_pte)
+			   bool no_update_pte,
+			   bool *flush_tlb)
 {
 	int ret;
 
@@ -1157,7 +1163,7 @@ static int map_bo_to_gpuvm(struct kgd_mem *mem,
 	if (no_update_pte)
 		return 0;
 
-	ret = update_gpuvm_pte(mem, entry, sync);
+	ret = update_gpuvm_pte(mem, entry, sync, flush_tlb);
 	if (ret) {
 		pr_err("update_gpuvm_pte() failed\n");
 		goto update_gpuvm_pte_failed;
@@ -1687,7 +1693,8 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
 }
 
 int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
-		struct kgd_dev *kgd, struct kgd_mem *mem, void *drm_priv)
+		struct kgd_dev *kgd, struct kgd_mem *mem,
+		void *drm_priv, bool *flush_tlb)
 {
 	struct amdgpu_device *adev = get_amdgpu_device(kgd);
 	struct amdgpu_vm *avm = drm_priv_to_vm(drm_priv);
@@ -1775,7 +1782,7 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
 			 entry->va, entry->va + bo_size, entry);
 
 		ret = map_bo_to_gpuvm(mem, entry, ctx.sync,
-				      is_invalid_userptr);
+				      is_invalid_userptr, flush_tlb);
 		if (ret) {
 			pr_err("Failed to map bo to gpuvm\n");
 			goto out_unreserve;
@@ -2469,7 +2476,7 @@ static int validate_invalid_user_pages(struct amdkfd_process_info *process_info)
 				continue;
 
 			kfd_mem_dmaunmap_attachment(mem, attachment);
-			ret = update_gpuvm_pte(mem, attachment, &sync);
+			ret = update_gpuvm_pte(mem, attachment, &sync, NULL);
 			if (ret) {
 				pr_err("%s: update PTE failed\n", __func__);
 				/* make sure this gets validated again */
@@ -2675,7 +2682,7 @@ int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence **ef)
 				continue;
 
 			kfd_mem_dmaunmap_attachment(mem, attachment);
-			ret = update_gpuvm_pte(mem, attachment, &sync_obj);
+			ret = update_gpuvm_pte(mem, attachment, &sync_obj, NULL);
 			if (ret) {
 				pr_debug("Memory eviction: update PTE failed. Try again\n");
 				goto validate_map_fail;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
index ba1cf66e9172..d987acfa80a8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
@@ -87,6 +87,7 @@ struct amdgpu_bo_va {
 	bool				cleared;
 
 	bool				is_xgmi;
+	bool				table_freed;
 };
 
 struct amdgpu_bo {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 2c20bba7dc1a..03bfa1eba196 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1887,7 +1887,7 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev, struct amdgpu_bo_va *bo_va,
 						resv, mapping->start,
 						mapping->last, update_flags,
 						mapping->offset, mem,
-						pages_addr, last_update, NULL,
+						pages_addr, last_update, &bo_va->table_freed,
 						vram_base_offset);
 		if (r)
 			return r;
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index 960913a35ee4..136f77cadc2f 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -1574,6 +1574,7 @@ static int kfd_ioctl_map_memory_to_gpu(struct file *filep,
 	long err = 0;
 	int i;
 	uint32_t *devices_arr = NULL;
+	bool flush_tlb = false;
 
 	trace_kfd_map_memory_to_gpu_start(p);
 	dev = kfd_device_by_id(GET_GPU_ID(args->handle));
@@ -1637,7 +1638,8 @@ static int kfd_ioctl_map_memory_to_gpu(struct file *filep,
 			goto map_memory_to_gpu_failed;
 
 		err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(
-			peer->kgd, (struct kgd_mem *)mem, peer_pdd->drm_priv);
+			peer->kgd, (struct kgd_mem *)mem,
+			peer_pdd->drm_priv, &flush_tlb);
 		if (err) {
 			pr_err("Failed to map to gpu %d/%d\n",
 			       i, args->n_devices);
@@ -1658,16 +1660,18 @@ static int kfd_ioctl_map_memory_to_gpu(struct file *filep,
 	}
 
 	/* Flush TLBs after waiting for the page table updates to complete */
-	for (i = 0; i < args->n_devices; i++) {
-		peer = kfd_device_by_id(devices_arr[i]);
-		if (WARN_ON_ONCE(!peer))
-			continue;
-		peer_pdd = kfd_get_process_device_data(peer, p);
-		if (WARN_ON_ONCE(!peer_pdd))
-			continue;
-		if (!amdgpu_read_lock(peer->ddev, true)) {
-			kfd_flush_tlb(peer_pdd);
-			amdgpu_read_unlock(peer->ddev);
+	if (flush_tlb) {
+		for (i = 0; i < args->n_devices; i++) {
+			peer = kfd_device_by_id(devices_arr[i]);
+			if (WARN_ON_ONCE(!peer))
+				continue;
+			peer_pdd = kfd_get_process_device_data(peer, p);
+			if (WARN_ON_ONCE(!peer_pdd))
+				continue;
+			if (!amdgpu_read_lock(peer->ddev, true)) {
+				kfd_flush_tlb(peer_pdd, TLB_FLUSH_LEGACY);
+				amdgpu_read_unlock(peer->ddev);
+			}
 		}
 	}
 
@@ -1766,6 +1770,7 @@ static int kfd_ioctl_unmap_memory_from_gpu(struct file *filep,
 			amdgpu_read_unlock(peer->ddev);
 			goto unmap_memory_from_gpu_failed;
 		}
+		kfd_flush_tlb(peer_pdd, TLB_FLUSH_HEAVYWEIGHT);
 		amdgpu_read_unlock(peer->ddev);
 		args->n_success = i+1;
 	}
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
index 2bd621eee4e0..904b8178c1d7 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -278,7 +278,7 @@ static int allocate_vmid(struct device_queue_manager *dqm,
 			qpd->vmid,
 			qpd->page_table_base);
 	/* invalidate the VM context after pasid and vmid mapping is set up */
-	kfd_flush_tlb(qpd_to_pdd(qpd));
+	kfd_flush_tlb(qpd_to_pdd(qpd), TLB_FLUSH_LEGACY);
 
 	if (dqm->dev->kfd2kgd->set_scratch_backing_va)
 		dqm->dev->kfd2kgd->set_scratch_backing_va(dqm->dev->kgd,
@@ -314,7 +314,7 @@ static void deallocate_vmid(struct device_queue_manager *dqm,
 		if (flush_texture_cache_nocpsch(q->device, qpd))
 			pr_err("Failed to flush TC\n");
 
-	kfd_flush_tlb(qpd_to_pdd(qpd));
+	kfd_flush_tlb(qpd_to_pdd(qpd), TLB_FLUSH_LEGACY);
 
 	/* Release the vmid mapping */
 	set_pasid_vmid_mapping(dqm, 0, qpd->vmid);
@@ -885,7 +885,7 @@ static int restore_process_queues_nocpsch(struct device_queue_manager *dqm,
 				dqm->dev->kgd,
 				qpd->vmid,
 				qpd->page_table_base);
-		kfd_flush_tlb(pdd);
+		kfd_flush_tlb(pdd, TLB_FLUSH_LEGACY);
 	}
 
 	/* Take a safe reference to the mm_struct, which may otherwise
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index ecdd5e782b81..edce3ecf207d 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -1338,7 +1338,7 @@ void kfd_signal_reset_event(struct kfd_dev *dev);
 
 void kfd_signal_poison_consumed_event(struct kfd_dev *dev, u32 pasid);
 
-void kfd_flush_tlb(struct kfd_process_device *pdd);
+void kfd_flush_tlb(struct kfd_process_device *pdd, enum TLB_FLUSH_TYPE type);
 
 int dbgdev_wave_reset_wavefronts(struct kfd_dev *dev, struct kfd_process *p);
 
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index 3995002c582b..9708214116dc 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -689,7 +689,8 @@ static int kfd_process_alloc_gpuvm(struct kfd_process_device *pdd,
 	if (err)
 		goto err_alloc_mem;
 
-	err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(kdev->kgd, mem, pdd->drm_priv);
+	err = amdgpu_amdkfd_gpuvm_map_memory_to_gpu(kdev->kgd, mem,
+			pdd->drm_priv, NULL);
 	if (err)
 		goto err_map_mem;
 
@@ -2159,7 +2160,7 @@ int kfd_reserved_mem_mmap(struct kfd_dev *dev, struct kfd_process *process,
 			       KFD_CWSR_TBA_TMA_SIZE, vma->vm_page_prot);
 }
 
-void kfd_flush_tlb(struct kfd_process_device *pdd)
+void kfd_flush_tlb(struct kfd_process_device *pdd, enum TLB_FLUSH_TYPE type)
 {
 	struct kfd_dev *dev = pdd->dev;
 
@@ -2172,7 +2173,7 @@ void kfd_flush_tlb(struct kfd_process_device *pdd)
 							pdd->qpd.vmid);
 	} else {
 		amdgpu_amdkfd_flush_gpu_tlb_pasid(dev->kgd,
-					pdd->process->pasid, TLB_FLUSH_LEGACY);
+					pdd->process->pasid, type);
 	}
 }
 
-- 
2.25.1



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