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drm/i915: Clean steer semaphore on resume

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During resume, the steer semaphore on GT1 was observed to be held. The
hardware team has confirmed the safety of clearing steer semaphores
for all GTs during driver load/resume, as no lock acquisitions can occur
in this process by other agents.

v2: reset on resume not in intel_gt_init().
v3: do the reset on intel_gt_resume_early()
v4: do general sanitization for all GTs(Matt)

Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230928130015.6758-3-nirmoy.das@intel.com
This commit is contained in:
Nirmoy Das
2023-09-28 15:00:14 +02:00
parent 35ba33f76c
commit 37280ef5c1
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/i915/gt/intel_gt_pm.c
View File

@@ -13,6 +13,7 @@
#include "intel_engine_pm.h"
#include "intel_gt.h"
#include "intel_gt_clock_utils.h"
#include "intel_gt_mcr.h"
#include "intel_gt_pm.h"
#include "intel_gt_print.h"
#include "intel_gt_requests.h"
@@ -218,6 +219,15 @@ void intel_gt_pm_fini(struct intel_gt *gt)
void intel_gt_resume_early(struct intel_gt *gt)
{
/*
* Sanitize steer semaphores during driver resume. This is necessary
* to address observed cases of steer semaphores being
* held after a suspend operation. Confirmation from the hardware team
* assures the safety of this operation, as no lock acquisitions
* by other agents occur during driver load/resume process.
*/
intel_gt_mcr_lock_sanitize(gt);
intel_uncore_resume_early(gt->uncore);
intel_gt_check_and_clear_faults(gt);
}