[PATCH v2 1/2] drm/amdgpu: add recent pagefault info in vm_manager

[Sunil Khatri <sunil.khatri@amd.com>]

Currently page fault information is stored per
vm and which could be freed or stale during
reset. Add it pagefault information in the
vm_manager which is a global space for vm's
and remains valid across.

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 8 ++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 4299ce386322..81fb3465e197 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2924,6 +2924,14 @@ void amdgpu_vm_update_fault_cache(struct amdgpu_device *adev,
 	if (vm && status) {
 		vm->fault_info.addr = addr;
 		vm->fault_info.status = status;
+		/*
+		 * Update the fault information globally for later usage
+		 * when vm could be stale or freed.
+		 */
+		adev->vm_manager.fault_info.addr = addr;
+		adev->vm_manager.fault_info.vmhub = vmhub;
+		adev->vm_manager.fault_info.status = status;
+
 		if (AMDGPU_IS_GFXHUB(vmhub)) {
 			vm->fault_info.vmhub = AMDGPU_VMHUB_TYPE_GFX;
 			vm->fault_info.vmhub |=
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 047ec1930d12..8efa8422f4f7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -422,6 +422,8 @@ struct amdgpu_vm_manager {
 	 * look up VM of a page fault
 	 */
 	struct xarray				pasids;
+	/* Global registration of recent page fault information */
+	struct amdgpu_vm_fault_info	fault_info;
 };
 
 struct amdgpu_bo_va_mapping;
-- 
2.34.1