[igt-dev] [PATCH i-g-t 18/23] i915/perf: Fix DG2 A0 report header

[Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>]

Timestamp is still 32 bits in DG2 A0. Fix that. Specify variants of DG2
that have the OA format header bug

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
---
 tests/i915/perf.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/tests/i915/perf.c b/tests/i915/perf.c
index 52de5d38..6951735b 100644
--- a/tests/i915/perf.c
+++ b/tests/i915/perf.c
@@ -40,6 +40,7 @@
 
 #include "i915/gem.h"
 #include "i915/perf.h"
+#include "i915_pciids.h"
 #include "igt.h"
 #include "igt_perf.h"
 #include "igt_sysfs.h"
@@ -503,6 +504,47 @@ cs_timestamp_frequency(int fd)
 	return value;
 }
 
+/*
+ * Hacky ways until IGT is fully aware of steppings:
+ *
+ * WA is permanent for G11. For other DG2s, bug is fixed from B0 onwards.
+ * Steps A0 and A1 correspond to 0 and 1 revid values.
+ */
+struct perf_dev_info {
+	bool is_dg2_g11;
+};
+
+static const struct perf_dev_info dg2_g11_info = {
+	.is_dg2_g11 = true,
+};
+
+static const struct pci_id_match perf_dev_match[] = {
+	INTEL_DG2_G11_IDS(&dg2_g11_info),
+};
+
+static const struct perf_dev_info *__dev_info(uint32_t device_id)
+{
+	static const struct perf_dev_info *cache;
+	static int _iter;
+
+	if (_iter)
+		goto out;
+
+	for (_iter = 0; _iter < ARRAY_SIZE(perf_dev_match); _iter++)
+		if (device_id == perf_dev_match[_iter].device_id)
+			cache = (void *) perf_dev_match[_iter].match_data;
+
+out:
+	return cache;
+}
+
+#define IS_DG2_G11(__d) (__dev_info(__d) ? __dev_info(__d)->is_dg2_g11 : false)
+#define IS_DG2_A0(__d) (IS_DG2(__d) && (intel_perf->devinfo.revision == 0))
+#define IS_DG2_A1(__d) (IS_DG2(__d) && (intel_perf->devinfo.revision == 1))
+
+#define HAS_OA_FORMAT_64BIT_HDR_BUG(__d) \
+	(IS_DG2_G11(__d) || IS_DG2_A0(__d) || IS_DG2_A1(__d))
+
 static uint64_t
 cs_timebase_scale(uint32_t u32_delta)
 {
@@ -514,7 +556,8 @@ oa_timestamp(const uint32_t *report, enum drm_i915_oa_format format)
 {
 	struct oa_format fmt = get_oa_format(format);
 
-	return fmt.report_hdr_64bit ? *(uint64_t *)&report[2] : report[1];
+	return fmt.report_hdr_64bit && !HAS_OA_FORMAT_64BIT_HDR_BUG(devid) ?
+		*(uint64_t *)&report[2] : report[1];
 }
 
 static uint64_t
-- 
2.25.1