drm/i915/guc: Fix missing ecodes

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@Intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Fixes: a6f0f9cf330a ("drm/i915/guc: Plumb GuC-capture into gpu_coredump")
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Cc: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Cc: Michael Cheng <michael.cheng@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Bruce Chang <yu.bruce.chang@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230311063714.570389-2-John.C.Harrison@Intel.com
(cherry picked from commit 9724ecdbb9ddd6da3260e4a442574b90fc75188a)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

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 fc3b994626a4fdc9f3d61fee47c23d304d3a5189..710999d7189ee3537f7436495e3ef70b7182fed4 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c
@@ -1571,6 +1571,27 @@ 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)
@@ -1612,6 +1633,7 @@ 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;
                }
        }