[PATCH v3] drm/i915: use display snapshot mechanism for display irq regs

[Jani Nikula <jani.nikula@intel.com>]

Move more display specific parts of GPU error logging behind the display
snapshot interface.

With the display register capture reduced to just one register, DERRMR,
there's quite a bit of boilerplate here. However, it's still a nice
abstraction and removes a DISPLAY_VER() usage from core i915. With this
approach, it's also easy to add to xe as needed.

v2: Remove stale comment

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 .../gpu/drm/i915/display/intel_display_irq.c  | 28 +++++++++++++++++++
 .../gpu/drm/i915/display/intel_display_irq.h  |  5 ++++
 .../drm/i915/display/intel_display_snapshot.c |  5 ++++
 drivers/gpu/drm/i915/i915_gpu_error.c         | 18 ------------
 drivers/gpu/drm/i915/i915_gpu_error.h         |  2 --
 5 files changed, 38 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c b/drivers/gpu/drm/i915/display/intel_display_irq.c
index d2a35e3630b1..f5dc050a6344 100644
--- a/drivers/gpu/drm/i915/display/intel_display_irq.c
+++ b/drivers/gpu/drm/i915/display/intel_display_irq.c
@@ -2329,3 +2329,31 @@ void intel_display_irq_init(struct intel_display *display)
 
 	INIT_WORK(&display->irq.vblank_dc_work, intel_display_vblank_dc_work);
 }
+
+struct intel_display_irq_snapshot {
+	u32 derrmr;
+};
+
+struct intel_display_irq_snapshot *
+intel_display_irq_snapshot_capture(struct intel_display *display)
+{
+	struct intel_display_irq_snapshot *snapshot;
+
+	snapshot = kzalloc(sizeof(*snapshot), GFP_ATOMIC);
+	if (!snapshot)
+		return NULL;
+
+	if (DISPLAY_VER(display) >= 6 && DISPLAY_VER(display) < 20)
+		snapshot->derrmr = intel_de_read(display, DERRMR);
+
+	return snapshot;
+}
+
+void intel_display_irq_snapshot_print(const struct intel_display_irq_snapshot *snapshot,
+				      struct drm_printer *p)
+{
+	if (!snapshot)
+		return;
+
+	drm_printf(p, "DERRMR: 0x%08x\n", snapshot->derrmr);
+}
diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.h b/drivers/gpu/drm/i915/display/intel_display_irq.h
index f72727768351..4f0e27a37854 100644
--- a/drivers/gpu/drm/i915/display/intel_display_irq.h
+++ b/drivers/gpu/drm/i915/display/intel_display_irq.h
@@ -12,7 +12,9 @@
 
 enum pipe;
 struct drm_crtc;
+struct drm_printer;
 struct intel_display;
+struct intel_display_irq_snapshot;
 
 void valleyview_enable_display_irqs(struct intel_display *display);
 void valleyview_disable_display_irqs(struct intel_display *display);
@@ -82,4 +84,7 @@ void intel_display_irq_init(struct intel_display *display);
 
 void i915gm_irq_cstate_wa(struct intel_display *display, bool enable);
 
+struct intel_display_irq_snapshot *intel_display_irq_snapshot_capture(struct intel_display *display);
+void intel_display_irq_snapshot_print(const struct intel_display_irq_snapshot *snapshot, struct drm_printer *p);
+
 #endif /* __INTEL_DISPLAY_IRQ_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_display_snapshot.c b/drivers/gpu/drm/i915/display/intel_display_snapshot.c
index 25ba043cbb65..66087302fdbc 100644
--- a/drivers/gpu/drm/i915/display/intel_display_snapshot.c
+++ b/drivers/gpu/drm/i915/display/intel_display_snapshot.c
@@ -7,6 +7,7 @@
 
 #include "intel_display_core.h"
 #include "intel_display_device.h"
+#include "intel_display_irq.h"
 #include "intel_display_params.h"
 #include "intel_display_snapshot.h"
 #include "intel_dmc.h"
@@ -20,6 +21,7 @@ struct intel_display_snapshot {
 	struct intel_display_params params;
 	struct intel_overlay_snapshot *overlay;
 	struct intel_dmc_snapshot *dmc;
+	struct intel_display_irq_snapshot *irq;
 };
 
 struct intel_display_snapshot *intel_display_snapshot_capture(struct intel_display *display)
@@ -38,6 +40,7 @@ struct intel_display_snapshot *intel_display_snapshot_capture(struct intel_displ
 
 	intel_display_params_copy(&snapshot->params);
 
+	snapshot->irq = intel_display_irq_snapshot_capture(display);
 	snapshot->overlay = intel_overlay_snapshot_capture(display);
 	snapshot->dmc = intel_dmc_snapshot_capture(display);
 
@@ -57,6 +60,7 @@ void intel_display_snapshot_print(const struct intel_display_snapshot *snapshot,
 	intel_display_device_info_print(&snapshot->info, &snapshot->runtime_info, p);
 	intel_display_params_dump(&snapshot->params, display->drm->driver->name, p);
 
+	intel_display_irq_snapshot_print(snapshot->irq, p);
 	intel_overlay_snapshot_print(snapshot->overlay, p);
 	intel_dmc_snapshot_print(snapshot->dmc, p);
 }
@@ -68,6 +72,7 @@ void intel_display_snapshot_free(struct intel_display_snapshot *snapshot)
 
 	intel_display_params_free(&snapshot->params);
 
+	kfree(snapshot->irq);
 	kfree(snapshot->overlay);
 	kfree(snapshot->dmc);
 	kfree(snapshot);
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 50cd0c433e6d..62e4a293ed9b 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -726,12 +726,6 @@ static void err_print_gt_info(struct drm_i915_error_state_buf *m,
 	intel_sseu_print_topology(gt->_gt->i915, &gt->info.sseu, &p);
 }
 
-static void err_print_gt_display(struct drm_i915_error_state_buf *m,
-				 struct intel_gt_coredump *gt)
-{
-	err_printf(m, "DERRMR: 0x%08x\n", gt->derrmr);
-}
-
 static void err_print_gt_global_nonguc(struct drm_i915_error_state_buf *m,
 				       struct intel_gt_coredump *gt)
 {
@@ -877,7 +871,6 @@ static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
 		if (error->gt->uc && error->gt->uc->guc.is_guc_capture)
 			print_guc_capture = true;
 
-		err_print_gt_display(m, error->gt);
 		err_print_gt_global_nonguc(m, error->gt);
 		err_print_gt_fences(m, error->gt);
 
@@ -1766,16 +1759,6 @@ gt_record_uc(struct intel_gt_coredump *gt,
 	return error_uc;
 }
 
-/* Capture display registers. */
-static void gt_record_display_regs(struct intel_gt_coredump *gt)
-{
-	struct intel_uncore *uncore = gt->_gt->uncore;
-	struct drm_i915_private *i915 = uncore->i915;
-
-	if (DISPLAY_VER(i915) >= 6 && DISPLAY_VER(i915) < 20)
-		gt->derrmr = intel_uncore_read(uncore, DERRMR);
-}
-
 /* Capture all other registers that GuC doesn't capture. */
 static void gt_record_global_nonguc_regs(struct intel_gt_coredump *gt)
 {
@@ -2034,7 +2017,6 @@ intel_gt_coredump_alloc(struct intel_gt *gt, gfp_t gfp, u32 dump_flags)
 	gc->_gt = gt;
 	gc->awake = intel_gt_pm_is_awake(gt);
 
-	gt_record_display_regs(gc);
 	gt_record_global_nonguc_regs(gc);
 
 	/*
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.h b/drivers/gpu/drm/i915/i915_gpu_error.h
index ac55603a81d7..182324979278 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.h
+++ b/drivers/gpu/drm/i915/i915_gpu_error.h
@@ -163,8 +163,6 @@ struct intel_gt_coredump {
 	u32 clock_frequency;
 	u32 clock_period_ns;
 
-	/* Display related */
-	u32 derrmr;
 	u32 sfc_done[I915_MAX_SFC]; /* gen12 */
 
 	u32 nfence;
-- 
2.39.5