Re: [PATCH] drm/i915/icl: Read the correct Gen11 interrupt registers

[Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>]

On 05/10/2018 02:59 PM, Oscar Mateo wrote:

Stop reading some now deprecated interrupt registers in both
debugfs and error state. Instead, read the new equivalents in the
Gen11 interrupt repartitioning scheme.

Note that the equivalent to the PM ISR & IIR cannot be read without
affecting the current state of the system, so I've opted for leaving
them out. See gen11_service_one_iir() for more info.

v2: else if !!! (Paulo)
v3: another else if (Vinay)
v4:
  - Rebased
  - Renamed patch
  - Improved the ordering of GENs
  - Improved the printing of per-GEN info
v5: Avoid maybe-unitialized & add comment explaining the lack
    of PM ISR & IIR

Suggested-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Sagar Arun Kamble <sagar.a.kamble@xxxxxxxxx>
Cc: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>
---

Reviewed-by: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>

 drivers/gpu/drm/i915/i915_debugfs.c   | 34 ++++++++++++++++++++++++----------
 drivers/gpu/drm/i915/i915_gpu_error.c | 11 ++++++++++-
 drivers/gpu/drm/i915/i915_gpu_error.h |  2 +-
 3 files changed, 35 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index d663a9e0..d992dd2 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1170,19 +1170,28 @@ static int i915_frequency_info(struct seq_file *m, void *unused)
 
 		intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
 
-		if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv)) {
-			pm_ier = I915_READ(GEN6_PMIER);
-			pm_imr = I915_READ(GEN6_PMIMR);
-			pm_isr = I915_READ(GEN6_PMISR);
-			pm_iir = I915_READ(GEN6_PMIIR);
-			pm_mask = I915_READ(GEN6_PMINTRMSK);
-		} else {
+		if (INTEL_GEN(dev_priv) >= 11) {
+			pm_ier = I915_READ(GEN11_GPM_WGBOXPERF_INTR_ENABLE);
+			pm_imr = I915_READ(GEN11_GPM_WGBOXPERF_INTR_MASK);
+			/*
+			 * The equivalent to the PM ISR & IIR cannot be read
+			 * without affecting the current state of the system
+			 */
+			pm_isr = 0;
+			pm_iir = 0;
+		} else if (INTEL_GEN(dev_priv) >= 8) {
 			pm_ier = I915_READ(GEN8_GT_IER(2));
 			pm_imr = I915_READ(GEN8_GT_IMR(2));
 			pm_isr = I915_READ(GEN8_GT_ISR(2));
 			pm_iir = I915_READ(GEN8_GT_IIR(2));
-			pm_mask = I915_READ(GEN6_PMINTRMSK);
+		} else {
+			pm_ier = I915_READ(GEN6_PMIER);
+			pm_imr = I915_READ(GEN6_PMIMR);
+			pm_isr = I915_READ(GEN6_PMISR);
+			pm_iir = I915_READ(GEN6_PMIIR);
 		}
+		pm_mask = I915_READ(GEN6_PMINTRMSK);
+
 		seq_printf(m, "Video Turbo Mode: %s\n",
 			   yesno(rpmodectl & GEN6_RP_MEDIA_TURBO));
 		seq_printf(m, "HW control enabled: %s\n",
@@ -1190,8 +1199,13 @@ static int i915_frequency_info(struct seq_file *m, void *unused)
 		seq_printf(m, "SW control enabled: %s\n",
 			   yesno((rpmodectl & GEN6_RP_MEDIA_MODE_MASK) ==
 				  GEN6_RP_MEDIA_SW_MODE));
-		seq_printf(m, "PM IER=0x%08x IMR=0x%08x ISR=0x%08x IIR=0x%08x, MASK=0x%08x\n",
-			   pm_ier, pm_imr, pm_isr, pm_iir, pm_mask);
+
+		seq_printf(m, "PM IER=0x%08x IMR=0x%08x, MASK=0x%08x\n",
+			   pm_ier, pm_imr, pm_mask);
+		if (INTEL_GEN(dev_priv) < 11) {
+			seq_printf(m, "PM ISR=0x%08x IIR=0x%08x\n",
+				   pm_isr, pm_iir);
+		}
 		seq_printf(m, "pm_intrmsk_mbz: 0x%08x\n",
 			   rps->pm_intrmsk_mbz);
 		seq_printf(m, "GT_PERF_STATUS: 0x%08x\n", gt_perf_status);
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index b98cd44..d9f2f69 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1675,7 +1675,16 @@ static void capture_reg_state(struct i915_gpu_state *error)
 	}
 
 	/* 4: Everything else */
-	if (INTEL_GEN(dev_priv) >= 8) {
+	if (INTEL_GEN(dev_priv) >= 11) {
+		error->ier = I915_READ(GEN8_DE_MISC_IER);
+		error->gtier[0] = I915_READ(GEN11_RENDER_COPY_INTR_ENABLE);
+		error->gtier[1] = I915_READ(GEN11_VCS_VECS_INTR_ENABLE);
+		error->gtier[2] = I915_READ(GEN11_GUC_SG_INTR_ENABLE);
+		error->gtier[3] = I915_READ(GEN11_GPM_WGBOXPERF_INTR_ENABLE);
+		error->gtier[4] = I915_READ(GEN11_CRYPTO_RSVD_INTR_ENABLE);
+		error->gtier[5] = I915_READ(GEN11_GUNIT_CSME_INTR_ENABLE);
+		error->ngtier = 6;
+	} else if (INTEL_GEN(dev_priv) >= 8) {
 		error->ier = I915_READ(GEN8_DE_MISC_IER);
 		for (i = 0; i < 4; i++)
 			error->gtier[i] = I915_READ(GEN8_GT_IER(i));
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.h b/drivers/gpu/drm/i915/i915_gpu_error.h
index dac0f8c..58910f1 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.h
+++ b/drivers/gpu/drm/i915/i915_gpu_error.h
@@ -58,7 +58,7 @@ struct i915_gpu_state {
 	u32 eir;
 	u32 pgtbl_er;
 	u32 ier;
-	u32 gtier[4], ngtier;
+	u32 gtier[6], ngtier;
 	u32 ccid;
 	u32 derrmr;
 	u32 forcewake;

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