[Intel-gfx] [RFC 2/2] drm/i915: Use ABI engine class in error state ecode

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Instead of printing out the internal engine mask, which can change between
kernel versions making it difficult to map to actual engines, present a
bitmask of hanging engines ABI classes. For example:

  [drm] GPU HANG: ecode 9:24dffffd:8, in gem_exec_schedu [1334]

Notice the swapped the order of ecode and bitmask which makes the new
versus old bug reports are obvious.

Engine ABI class is useful to quickly categorize render vs media etc hangs
in bug reports. Considering virtual engine even more so than the current
scheme.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/i915_gpu_error.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 857db66cc4a3..e7d9af184d58 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1659,17 +1659,16 @@ static u32 generate_ecode(const struct intel_engine_coredump *ee)
 static const char *error_msg(struct i915_gpu_coredump *error)
 {
 	struct intel_engine_coredump *first = NULL;
+	unsigned int hung_classes = 0;
 	struct intel_gt_coredump *gt;
-	intel_engine_mask_t engines;
 	int len;
 
-	engines = 0;
 	for (gt = error->gt; gt; gt = gt->next) {
 		struct intel_engine_coredump *cs;
 
 		for (cs = gt->engine; cs; cs = cs->next) {
 			if (cs->hung) {
-				engines |= cs->engine->mask;
+				hung_classes |= BIT(cs->engine->uabi_class);
 				if (!first)
 					first = cs;
 			}
@@ -1677,9 +1676,11 @@ static const char *error_msg(struct i915_gpu_coredump *error)
 	}
 
 	len = scnprintf(error->error_msg, sizeof(error->error_msg),
-			"GPU HANG: ecode %d:%x:%08x",
-			INTEL_GEN(error->i915), engines,
-			generate_ecode(first));
+			"GPU HANG: ecode %d:%08x:%x",
+			INTEL_GEN(error->i915),
+			generate_ecode(first),
+			hung_classes);
+
 	if (first && first->context.pid) {
 		/* Just show the first executing process, more is confusing */
 		len += scnprintf(error->error_msg + len,
-- 
2.25.1

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