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drm/i915/reset: Add "intel_display_reset_count" debugfs file

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Expose the number of display resets performed in a new
"display_reset_count" debugfs file. kms_busy can use this to
confirm that the kernel actually took the full display reset path.

v2: Give the file an "intel_" namespace (Jani)

Cc: Jouni Högander <jouni.hogander@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Testcase: igt/kms_busy/*-with-reset
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260415210411.24750-7-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä 2026-04-16 00:04:10 +03:00
parent a9f8901e40
commit 584fff57f5
5 changed files with 19 additions and 0 deletions
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4
drivers/gpu/drm/i915/display/intel_display_core.h
View File

@ -559,6 +559,10 @@ struct intel_display {
unsigned long mask;
} quirks;
struct {
u32 count;
} reset;
struct {
/* restore state for suspend/resume and display reset */
struct drm_atomic_state *modeset_state;

2
drivers/gpu/drm/i915/display/intel_display_debugfs.c
View File

@ -27,6 +27,7 @@
#include "intel_display_power.h"
#include "intel_display_power_well.h"
#include "intel_display_regs.h"
#include "intel_display_reset.h"
#include "intel_display_rpm.h"
#include "intel_display_types.h"
#include "intel_dmc.h"
@ -838,6 +839,7 @@ void intel_display_debugfs_register(struct intel_display *display)
intel_bios_debugfs_register(display);
intel_cdclk_debugfs_register(display);
intel_display_reset_debugfs_register(display);
intel_dmc_debugfs_register(display);
intel_dp_test_debugfs_register(display);
intel_fbc_debugfs_register(display);

10
drivers/gpu/drm/i915/display/intel_display_reset.c
View File

@ -3,6 +3,8 @@
* Copyright © 2023 Intel Corporation
*/
#include <linux/debugfs.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_print.h>
@ -66,6 +68,7 @@ void intel_display_reset_prepare(struct intel_display *display)
return;
}
display->reset.count++;
display->restore.modeset_state = state;
state->acquire_ctx = ctx;
}
@ -114,3 +117,10 @@ void intel_display_reset_finish(struct intel_display *display, bool test_only)
drm_modeset_acquire_fini(ctx);
mutex_unlock(&display->drm->mode_config.mutex);
}
void intel_display_reset_debugfs_register(struct intel_display *display)
{
debugfs_create_u32("intel_display_reset_count", 0400,
display->drm->debugfs_root,
&display->reset.count);
}

2
drivers/gpu/drm/i915/display/intel_display_reset.h
View File

@ -15,4 +15,6 @@ bool intel_display_reset_test(struct intel_display *display);
void intel_display_reset_prepare(struct intel_display *display);
void intel_display_reset_finish(struct intel_display *display, bool test_only);
void intel_display_reset_debugfs_register(struct intel_display *display);
#endif /* __INTEL_RESET_H__ */

1
drivers/gpu/drm/xe/Makefile
View File

@ -260,6 +260,7 @@ xe-$(CONFIG_DRM_XE_DISPLAY) += \
i915-display/intel_display_power.o \
i915-display/intel_display_power_map.o \
i915-display/intel_display_power_well.o \
i915-display/intel_display_reset.o \
i915-display/intel_display_rpm.o \
i915-display/intel_display_rps.o \
i915-display/intel_display_trace.o \