[PATCH v3 1/3] drm/i915/guc: Fix missing ecodes

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

Error captures are tagged with an 'ecode'. This is a pseduo-unique magic
number that is meant to distinguish similar seeming bugs with
different underlying signatures. It is a combination of two ring state
registers. Unfortunately, the register state being used is only valid
in execlist mode. In GuC mode, the register state exists in a separate
list of arbitrary register address/value pairs rather than the named
entry structure. So, search through that list to find the two exciting
registers and copy them over to the structure's named members.

v2: if else if instead of if if (Alan)

Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis at intel.com>
Fixes: a6f0f9cf330a ("drm/i915/guc: Plumb GuC-capture into gpu_coredump")
Cc: Alan Previn <alan.previn.teres.alexis at intel.com>
Cc: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
Cc: Aravind Iddamsetty <aravind.iddamsetty at intel.com>
Cc: Michael Cheng <michael.cheng at intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Cc: Bruce Chang <yu.bruce.chang at intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Matthew Auld <matthew.auld at intel.com>
---
 .../gpu/drm/i915/gt/uc/intel_guc_capture.c    | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c
index 101d44de729b1..36196cbb24c6b 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c
@@ -1562,6 +1562,27 @@ int intel_guc_capture_print_engine_node(struct drm_i915_error_state_buf *ebuf,
 
 #endif //CONFIG_DRM_I915_CAPTURE_ERROR
 
+static void guc_capture_find_ecode(struct intel_engine_coredump *ee)
+{
+	struct gcap_reg_list_info *reginfo;
+	struct guc_mmio_reg *regs;
+	i915_reg_t reg_ipehr = RING_IPEHR(0);
+	i915_reg_t reg_instdone = RING_INSTDONE(0);
+	int i;
+
+	if (!ee->guc_capture_node)
+		return;
+
+	reginfo = ee->guc_capture_node->reginfo + GUC_CAPTURE_LIST_TYPE_ENGINE_INSTANCE;
+	regs = reginfo->regs;
+	for (i = 0; i < reginfo->num_regs; i++) {
+		if (regs[i].offset == reg_ipehr.reg)
+			ee->ipehr = regs[i].value;
+		else if (regs[i].offset == reg_instdone.reg)
+			ee->instdone.instdone = regs[i].value;
+	}
+}
+
 void intel_guc_capture_free_node(struct intel_engine_coredump *ee)
 {
 	if (!ee || !ee->guc_capture_node)
@@ -1601,6 +1622,7 @@ void intel_guc_capture_get_matching_node(struct intel_gt *gt,
 			list_del(&n->link);
 			ee->guc_capture_node = n;
 			ee->guc_capture = guc->capture;
+			guc_capture_find_ecode(ee);
 			return;
 		}
 	}
-- 
2.39.1