[RFC PATCH 3/6] drm/xe: Add mem_region to properties line in VM snapshot capture

[Matthew Brost]

Add memory region to properties line in VM snapshot capture indicating
where the memory is located. The memory region corresponds to regions in
the uAPI. This is useful information for debug and will help build a
robust GPU hang replay tool.

The current format is:

[<vma address>]: <permissions>|<type>|mem_region=0x%x

Permissions has two options, either "read_only" or "read_write".

Type has three options, either "userptr", "null_sparse", or "bo".

Memory region is a bit mask of where the memory is located.

Cc: José Roberto de Souza <jose.souza at intel.com>
Signed-off-by: Matthew Brost <matthew.brost at intel.com>
---
 drivers/gpu/drm/xe/xe_vm.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index 469b00150d87..791faa46c311 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -3244,6 +3244,7 @@ struct xe_vm_snapshot {
 #define XE_VM_SNAP_FLAG_READ_ONLY	BIT(1)
 #define XE_VM_SNAP_FLAG_IS_NULL		BIT(2)
 		unsigned long flags;
+		int uapi_mem_region;
 		struct xe_bo *bo;
 		void *data;
 		struct mm_struct *mm;
@@ -3289,6 +3290,18 @@ struct xe_vm_snapshot *xe_vm_snapshot_capture(struct xe_vm *vm)
 		if (bo) {
 			snap->snap[i].bo = xe_bo_get(bo);
 			snap->snap[i].bo_ofs = xe_vma_bo_offset(vma);
+			switch (bo->ttm.resource->mem_type) {
+			case XE_PL_SYSTEM:
+			case XE_PL_TT:
+				snap->snap[i].uapi_mem_region = 0;
+				break;
+			case XE_PL_VRAM0:
+				snap->snap[i].uapi_mem_region = 1;
+				break;
+			case XE_PL_VRAM1:
+				snap->snap[i].uapi_mem_region = 2;
+				break;
+			}
 		} else if (xe_vma_is_userptr(vma)) {
 			struct mm_struct *mm =
 				to_userptr_vma(vma)->userptr.notifier.mm;
@@ -3300,10 +3313,13 @@ struct xe_vm_snapshot *xe_vm_snapshot_capture(struct xe_vm *vm)
 
 			snap->snap[i].bo_ofs = xe_vma_userptr(vma);
 			snap->snap[i].flags |= XE_VM_SNAP_FLAG_USERPTR;
+			snap->snap[i].uapi_mem_region = 0;
 		} else if (xe_vma_is_null(vma)) {
 			snap->snap[i].flags |= XE_VM_SNAP_FLAG_IS_NULL;
+			snap->snap[i].uapi_mem_region = -1;
 		} else {
 			snap->snap[i].data = ERR_PTR(-ENOENT);
+			snap->snap[i].uapi_mem_region = -1;
 		}
 		i++;
 	}
@@ -3372,13 +3388,16 @@ void xe_vm_snapshot_print(struct xe_vm_snapshot *snap, struct drm_printer *p)
 	for (i = 0; i < snap->num_snaps; i++) {
 		drm_printf(p, "[%llx].length: 0x%lx\n", snap->snap[i].ofs, snap->snap[i].len);
 
-		drm_printf(p, "[%llx].properties: %s|%s\n", snap->snap[i].ofs,
+		drm_printf(p, "[%llx].properties: %s|%s|mem_region=0x%lx\n",
+			   snap->snap[i].ofs,
 			   snap->snap[i].flags & XE_VM_SNAP_FLAG_READ_ONLY ?
 			   "read_only" : "read_write",
 			   snap->snap[i].flags & XE_VM_SNAP_FLAG_IS_NULL ?
 			   "null_sparse" :
 			   snap->snap[i].flags & XE_VM_SNAP_FLAG_USERPTR ?
-			   "userptr" : "bo");
+			   "userptr" : "bo",
+			   snap->snap[i].uapi_mem_region == -1 ? 0 :
+			   BIT(snap->snap[i].uapi_mem_region));
 
 		if (IS_ERR(snap->snap[i].data)) {
 			drm_printf(p, "[%llx].error: %li\n", snap->snap[i].ofs,
-- 
2.34.1