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drm/xe: Add cpu_caching to properties line in VM snapshot capture

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Add CPU caching to properties line in VM snapshot capture indicating
the BO caching properites. 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|pat_index=%d|cpu_caching=%d

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.

Pat index corresponds to the value setup upon VM bind.

CPU caching corresponds to the value of BO setup upon creation.

v2:
 - Save off cpu_caching value rather than looking at BO (Carlos)
v4:
 - Fix NULL ptr dereference (Carlos)

Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Link: https://patch.msgid.link/20251126185952.546277-6-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2025-11-26 10:59:48 -08:00
parent 6cf5d14a0b
commit 066a1ddd85
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/xe/xe_vm.c
View File

@ -4053,6 +4053,7 @@ struct xe_vm_snapshot {
unsigned long flags;
int uapi_mem_region;
int pat_index;
int cpu_caching;
struct xe_bo *bo;
void *data;
struct mm_struct *mm;
@ -4097,6 +4098,7 @@ struct xe_vm_snapshot *xe_vm_snapshot_capture(struct xe_vm *vm)
XE_VM_SNAP_FLAG_READ_ONLY : 0;
snap->snap[i].pat_index = vma->attr.pat_index;
if (bo) {
snap->snap[i].cpu_caching = bo->cpu_caching;
snap->snap[i].bo = xe_bo_get(bo);
snap->snap[i].bo_ofs = xe_vma_bo_offset(vma);
switch (bo->ttm.resource->mem_type) {
@ -4197,7 +4199,7 @@ 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|mem_region=0x%lx|pat_index=%d\n",
drm_printf(p, "[%llx].properties: %s|%s|mem_region=0x%lx|pat_index=%d|cpu_caching=%d\n",
snap->snap[i].ofs,
snap->snap[i].flags & XE_VM_SNAP_FLAG_READ_ONLY ?
"read_only" : "read_write",
@ -4207,7 +4209,8 @@ void xe_vm_snapshot_print(struct xe_vm_snapshot *snap, struct drm_printer *p)
"userptr" : "bo",
snap->snap[i].uapi_mem_region == -1 ? 0 :
BIT(snap->snap[i].uapi_mem_region),
snap->snap[i].pat_index);
snap->snap[i].pat_index,
snap->snap[i].cpu_caching);
if (IS_ERR(snap->snap[i].data)) {
drm_printf(p, "[%llx].error: %li\n", snap->snap[i].ofs,