Commit 7937ea73 authored by Sanjay Yadav's avatar Sanjay Yadav Committed by Matthew Auld
Browse files

drm/xe: Fix missing runtime PM reference in ccs_mode_store 

ccs_mode_store() calls xe_gt_reset() which internally invokes
xe_pm_runtime_get_noresume(). That function requires the caller
to already hold an outer runtime PM reference and warns if none
is held:

  [46.891177] xe 0000:03:00.0: [drm] Missing outer runtime PM protection
  [46.891178] WARNING: drivers/gpu/drm/xe/xe_pm.c:885 at
  xe_pm_runtime_get_noresume+0x8b/0xc0

Fix this by protecting xe_gt_reset() with the scope-based
guard(xe_pm_runtime)(xe), which is the preferred form when
the reference lifetime matches a single scope.

v2:
- Use scope-based guard(xe_pm_runtime)(xe) (Shuicheng)
- Update commit message accordingly

Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/7593


Fixes: 480b358e ("drm/xe: Do not wake device during a GT reset")
Cc: <stable@vger.kernel.org> # v6.19+
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Shuicheng Lin <shuicheng.lin@intel.com>
Suggested-by: default avatarMatthew Auld <matthew.auld@intel.com>
Signed-off-by: default avatarSanjay Yadav <sanjay.kumar.yadav@intel.com>
Reviewed-by: default avatarShuicheng Lin <shuicheng.lin@intel.com>
Reviewed-by: default avatarMatthew Auld <matthew.auld@intel.com>
Signed-off-by: default avatarMatthew Auld <matthew.auld@intel.com>
Link: https://patch.msgid.link/20260313071608.3459480-2-sanjay.kumar.yadav@intel.com
parent 466e75d4

drivers/gpu/drm/xe/xe_gt_ccs_mode.c

+2 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include "xe_gt_printk.h"

#include "xe_gt_sysfs.h"

#include "xe_mmio.h"

#include "xe_pm.h"

#include "xe_sriov.h"

#include "xe_sriov_pf.h"
@@ -163,6 +164,7 @@ ccs_mode_store(struct device *kdev, struct device_attribute *attr, 
	xe_gt_info(gt, "Setting compute mode to %d\n", num_engines);

	gt->ccs_mode = num_engines;

	xe_gt_record_user_engines(gt);

	guard(xe_pm_runtime)(xe);

	xe_gt_reset(gt);



	/* We may end PF lockdown once CCS mode is default again */