[Intel-xe] [PATCH 6/7] drm/xe/reg_sr: Save errors for kunit integration

[Lucas De Marchi <lucas.demarchi@intel.com>]

When there's an entry that is dropped when xe_reg_sr_add(), there's
not much we can do other than reporting the error - it's for certain a
driver issue or conflicting workarounds/tunings. Save the number of
errors to be used later by kunit to report where it happens.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 drivers/gpu/drm/xe/xe_reg_sr.c       | 8 ++++++++
 drivers/gpu/drm/xe/xe_reg_sr_types.h | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_reg_sr.c b/drivers/gpu/drm/xe/xe_reg_sr.c
index 9eaf1be27886..83f29aeb9250 100644
--- a/drivers/gpu/drm/xe/xe_reg_sr.c
+++ b/drivers/gpu/drm/xe/xe_reg_sr.c
@@ -84,6 +84,13 @@ static bool compatible_entries(const struct xe_reg_sr_entry *e1,
 	return true;
 }
 
+static void reg_sr_inc_error(struct xe_reg_sr *sr)
+{
+#if IS_ENABLED(CONFIG_DRM_XE_KUNIT_TEST)
+	sr->errors++;
+#endif
+}
+
 int xe_reg_sr_add(struct xe_reg_sr *sr, u32 reg,
 		  const struct xe_reg_sr_entry *e)
 {
@@ -121,6 +128,7 @@ int xe_reg_sr_add(struct xe_reg_sr *sr, u32 reg,
 	DRM_ERROR("Discarding save-restore reg %04lx (clear: %08x, set: %08x, masked: %s): ret=%d\n",
 		  idx, e->clr_bits, e->set_bits,
 		  str_yes_no(e->masked_reg), ret);
+	reg_sr_inc_error(sr);
 
 	return ret;
 }
diff --git a/drivers/gpu/drm/xe/xe_reg_sr_types.h b/drivers/gpu/drm/xe/xe_reg_sr_types.h
index 3d2257891005..91469784fd90 100644
--- a/drivers/gpu/drm/xe/xe_reg_sr_types.h
+++ b/drivers/gpu/drm/xe/xe_reg_sr_types.h
@@ -32,6 +32,10 @@ struct xe_reg_sr {
 	} pool;
 	struct xarray xa;
 	const char *name;
+
+#if IS_ENABLED(CONFIG_DRM_XE_KUNIT_TEST)
+	unsigned int errors;
+#endif
 };
 
 #endif
-- 
2.39.0