drm/i915: ratelimit errors in display engine irq

While debugging page table faults it's useful not to kill the machine
with thousands of error mesages. Ratelimit all errors in
gen8_de_irq_handler().
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221215001459.3759580-1-lucas.demarchi@intel.com

drivers/gpu/drm/i915/i915_irq.c

@@ -2447,8 +2447,8 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 			ret = IRQ_HANDLED;
 			gen8_de_misc_irq_handler(dev_priv, iir);
 		} else {
-			drm_err(&dev_priv->drm,
-				"The master control interrupt lied (DE MISC)!\n");
+			drm_err_ratelimited(&dev_priv->drm,
+					    "The master control interrupt lied (DE MISC)!\n");
 		}
 	}
 
@@ -2459,8 +2459,8 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 			ret = IRQ_HANDLED;
 			gen11_hpd_irq_handler(dev_priv, iir);
 		} else {
-			drm_err(&dev_priv->drm,
-				"The master control interrupt lied, (DE HPD)!\n");
+			drm_err_ratelimited(&dev_priv->drm,
+					    "The master control interrupt lied, (DE HPD)!\n");
 		}
 	}
 
@@ -2509,12 +2509,12 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 			}
 
 			if (!found)
-				drm_err(&dev_priv->drm,
-					"Unexpected DE Port interrupt\n");
+				drm_err_ratelimited(&dev_priv->drm,
+						    "Unexpected DE Port interrupt\n");
 		}
 		else
-			drm_err(&dev_priv->drm,
-				"The master control interrupt lied (DE PORT)!\n");
+			drm_err_ratelimited(&dev_priv->drm,
+					    "The master control interrupt lied (DE PORT)!\n");
 	}
 
 	for_each_pipe(dev_priv, pipe) {
@@ -2525,8 +2525,8 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 
 		iir = intel_uncore_read(&dev_priv->uncore, GEN8_DE_PIPE_IIR(pipe));
 		if (!iir) {
-			drm_err(&dev_priv->drm,
-				"The master control interrupt lied (DE PIPE)!\n");
+			drm_err_ratelimited(&dev_priv->drm,
+					    "The master control interrupt lied (DE PIPE)!\n");
 			continue;
 		}
 
@@ -2547,10 +2547,10 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 
 		fault_errors = iir & gen8_de_pipe_fault_mask(dev_priv);
 		if (fault_errors)
-			drm_err(&dev_priv->drm,
-				"Fault errors on pipe %c: 0x%08x\n",
-				pipe_name(pipe),
-				fault_errors);
+			drm_err_ratelimited(&dev_priv->drm,
+					    "Fault errors on pipe %c: 0x%08x\n",
+					    pipe_name(pipe),
+					    fault_errors);
 	}
 
 	if (HAS_PCH_SPLIT(dev_priv) && !HAS_PCH_NOP(dev_priv) &&