From: jsg <jsg@openbsd.org>
Date: Fri, 30 Aug 2024 04:00:30 +0000 (+0000)
Subject: drm/amdkfd: Move dma unmapping after TLB flush
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=fe6a82eb6cdd29a4e165ae1e068521a2bdce3943;p=openbsd

drm/amdkfd: Move dma unmapping after TLB flush

From Philip Yang
14fafdfdadf987e260adb3f807f5f1b5b21f0170 in linux-6.6.y/6.6.48
101b8104307eac734f2dfa4d3511430b0b631c73 in mainline linux
---

diff --git a/sys/dev/pci/drm/amd/amdgpu/amdgpu_amdkfd.h b/sys/dev/pci/drm/amd/amdgpu/amdgpu_amdkfd.h
index 9306b3d608b..db463d2d6fc 100644
--- a/sys/dev/pci/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/sys/dev/pci/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -303,6 +303,7 @@ int amdgpu_amdkfd_gpuvm_map_memory_to_gpu(struct amdgpu_device *adev,
 					  struct kgd_mem *mem, void *drm_priv);
 int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
 		struct amdgpu_device *adev, struct kgd_mem *mem, void *drm_priv);
+void amdgpu_amdkfd_gpuvm_dmaunmap_mem(struct kgd_mem *mem, void *drm_priv);
 int amdgpu_amdkfd_gpuvm_sync_memory(
 		struct amdgpu_device *adev, struct kgd_mem *mem, bool intr);
 int amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel(struct kgd_mem *mem,
diff --git a/sys/dev/pci/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/sys/dev/pci/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index dc3fd9790ee..9fab9940baf 100644
--- a/sys/dev/pci/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/sys/dev/pci/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -733,7 +733,7 @@ kfd_mem_dmaunmap_sg_bo(struct kgd_mem *mem,
 	enum dma_data_direction dir;
 
 	if (unlikely(!ttm->sg)) {
-		pr_err("SG Table of BO is UNEXPECTEDLY NULL");
+		pr_debug("SG Table of BO is NULL");
 		return;
 	}
 
@@ -1202,8 +1202,6 @@ static void unmap_bo_from_gpuvm(struct kgd_mem *mem,
 	amdgpu_vm_clear_freed(adev, vm, &bo_va->last_pt_update);
 
 	amdgpu_sync_fence(sync, bo_va->last_pt_update);
-
-	kfd_mem_dmaunmap_attachment(mem, entry);
 }
 
 static int update_gpuvm_pte(struct kgd_mem *mem,
@@ -1258,6 +1256,7 @@ static int map_bo_to_gpuvm(struct kgd_mem *mem,
 
 update_gpuvm_pte_failed:
 	unmap_bo_from_gpuvm(mem, entry, sync);
+	kfd_mem_dmaunmap_attachment(mem, entry);
 	return ret;
 }
 
@@ -1862,8 +1861,10 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
 		mem->va + bo_size * (1 + mem->aql_queue));
 
 	/* Remove from VM internal data structures */
-	list_for_each_entry_safe(entry, tmp, &mem->attachments, list)
+	list_for_each_entry_safe(entry, tmp, &mem->attachments, list) {
+		kfd_mem_dmaunmap_attachment(mem, entry);
 		kfd_mem_detach(entry);
+	}
 
 	ret = unreserve_bo_and_vms(&ctx, false, false);
 
@@ -2037,6 +2038,23 @@ out:
 	return ret;
 }
 
+void amdgpu_amdkfd_gpuvm_dmaunmap_mem(struct kgd_mem *mem, void *drm_priv)
+{
+	struct kfd_mem_attachment *entry;
+	struct amdgpu_vm *vm;
+
+	vm = drm_priv_to_vm(drm_priv);
+
+	mutex_lock(&mem->lock);
+
+	list_for_each_entry(entry, &mem->attachments, list) {
+		if (entry->bo_va->base.vm == vm)
+			kfd_mem_dmaunmap_attachment(mem, entry);
+	}
+
+	mutex_unlock(&mem->lock);
+}
+
 int amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu(
 		struct amdgpu_device *adev, struct kgd_mem *mem, void *drm_priv)
 {
diff --git a/sys/dev/pci/drm/amd/amdkfd/kfd_chardev.c b/sys/dev/pci/drm/amd/amdkfd/kfd_chardev.c
index 010e4af4ea4..03a94230e5f 100644
--- a/sys/dev/pci/drm/amd/amdkfd/kfd_chardev.c
+++ b/sys/dev/pci/drm/amd/amdkfd/kfd_chardev.c
@@ -1432,17 +1432,21 @@ static int kfd_ioctl_unmap_memory_from_gpu(struct file *filep,
 			goto sync_memory_failed;
 		}
 	}
-	mutex_unlock(&p->mutex);
 
-	if (flush_tlb) {
-		/* Flush TLBs after waiting for the page table updates to complete */
-		for (i = 0; i < args->n_devices; i++) {
-			peer_pdd = kfd_process_device_data_by_id(p, devices_arr[i]);
-			if (WARN_ON_ONCE(!peer_pdd))
-				continue;
+	/* Flush TLBs after waiting for the page table updates to complete */
+	for (i = 0; i < args->n_devices; i++) {
+		peer_pdd = kfd_process_device_data_by_id(p, devices_arr[i]);
+		if (WARN_ON_ONCE(!peer_pdd))
+			continue;
+		if (flush_tlb)
 			kfd_flush_tlb(peer_pdd, TLB_FLUSH_HEAVYWEIGHT);
-		}
+
+		/* Remove dma mapping after tlb flush to avoid IO_PAGE_FAULT */
+		amdgpu_amdkfd_gpuvm_dmaunmap_mem(mem, peer_pdd->drm_priv);
 	}
+
+	mutex_unlock(&p->mutex);
+
 	kfree(devices_arr);
 
 	return 0;