[RFC PATCH 1/6] drm/xe: Add properties line to VM snapshot capture

[Matthew Brost]

Add properties line to VM snapshot capture which includes additional
information about VMA being dumped. This is helpful for debug purposes
but also to build a robust GPU hang replay tool.

The current format is:

[<vma address>]: <permissions>|<type>

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

Type has two options, either "userptr" or "bo".

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 | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index 690330352d4c..5f9651a4c364 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -3240,6 +3240,9 @@ struct xe_vm_snapshot {
 	struct {
 		u64 ofs, bo_ofs;
 		unsigned long len;
+#define XE_VM_SNAP_FLAG_USERPTR		BIT(0)
+#define XE_VM_SNAP_FLAG_READ_ONLY	BIT(1)
+		unsigned long flags;
 		struct xe_bo *bo;
 		void *data;
 		struct mm_struct *mm;
@@ -3280,6 +3283,8 @@ struct xe_vm_snapshot *xe_vm_snapshot_capture(struct xe_vm *vm)
 
 		snap->snap[i].ofs = xe_vma_start(vma);
 		snap->snap[i].len = xe_vma_size(vma);
+		snap->snap[i].flags = xe_vma_read_only(vma) ?
+			XE_VM_SNAP_FLAG_READ_ONLY : 0;
 		if (bo) {
 			snap->snap[i].bo = xe_bo_get(bo);
 			snap->snap[i].bo_ofs = xe_vma_bo_offset(vma);
@@ -3293,6 +3298,7 @@ struct xe_vm_snapshot *xe_vm_snapshot_capture(struct xe_vm *vm)
 				snap->snap[i].data = ERR_PTR(-EFAULT);
 
 			snap->snap[i].bo_ofs = xe_vma_userptr(vma);
+			snap->snap[i].flags |= XE_VM_SNAP_FLAG_USERPTR;
 		} else {
 			snap->snap[i].data = ERR_PTR(-ENOENT);
 		}
@@ -3362,6 +3368,12 @@ 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,
+			   snap->snap[i].flags & XE_VM_SNAP_FLAG_READ_ONLY ?
+			   "read_only" : "read_write",
+			   snap->snap[i].flags & XE_VM_SNAP_FLAG_USERPTR ?
+			   "userptr" : "bo");
+
 		if (IS_ERR(snap->snap[i].data)) {
 			drm_printf(p, "[%llx].error: %li\n", snap->snap[i].ofs,
 				   PTR_ERR(snap->snap[i].data));
-- 
2.34.1