[PATCH v10 3/5] tests/xe_pat: add pat-sanity subtest for debugfs vs getters

[Xin Wang <x.wang@intel.com>]

Add a new pat-sanity subtest that reads the Xe PAT software
configuration from debugfs and validates it against the
existing PAT index helper getters.

V2: (Matt Roper)
 - Use igt_assert_f() instead of igt_require_f() for PAT debugfs
parsing failures (treat as test failure, not skip).
 - Drop PAT entry dumping to reduce test noise.
 - Use igt_assert_eq() to improve failure diagnostics.

CC: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
CC: Matt Roper <matthew.d.roper@intel.com>
CC: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Xin Wang <x.wang@intel.com>
---
 tests/intel/xe_pat.c | 80 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/tests/intel/xe_pat.c b/tests/intel/xe_pat.c
index 2fd3635fd..cb2159aca 100644
--- a/tests/intel/xe_pat.c
+++ b/tests/intel/xe_pat.c
@@ -18,6 +18,7 @@
 #include "intel_blt.h"
 #include "intel_mocs.h"
 #include "intel_pat.h"
+#include "linux_scaffold.h"
 
 #include "xe/xe_ioctl.h"
 #include "xe/xe_query.h"
@@ -76,6 +77,82 @@ static void userptr_coh_none(int fd)
 	munmap(data, size);
 	xe_vm_destroy(fd, vm);
 }
+#define REG_FIELD_GET(__mask, __val) \
+	((uint32_t)FIELD_GET(__mask, __val))
+
+#define XE2_NO_PROMOTE	REG_BIT(10)
+#define XE2_COMP_EN	REG_BIT(9)
+#define XE2_L3_CLOS	GENMASK(7, 6)
+#define XE2_L3_POLICY	GENMASK(5, 4)
+#define XE2_L4_POLICY	GENMASK(3, 2)
+#define XE2_COH_MODE	GENMASK(1, 0)
+
+#define L3_CLOS1		1
+#define L3_CLOS2		2
+#define L3_CLOS3		3
+
+#define L3_CACHE_POLICY_WB	0
+#define L3_CACHE_POLICY_XD	1
+#define L3_CACHE_POLICY_UC	3
+
+#define L4_CACHE_POLICY_WB	0
+#define L4_CACHE_POLICY_WT	1
+#define L4_CACHE_POLICY_UC	3
+
+#define COH_MODE_NONE	  	0
+#define COH_MODE_1WAY		2
+#define COH_MODE_2WAY		3
+
+static int xe_fetch_pat_sw_config(int fd, struct intel_pat_cache *pat_sw_config)
+{
+	int32_t parsed = xe_get_pat_sw_config(fd, pat_sw_config);
+
+	igt_assert_f(parsed > 0, "Couldn't get Xe PAT software configuration\n");
+
+	return parsed;
+}
+
+/**
+ * SUBTEST: pat-sanity
+ * Test category: functionality test
+ * Description: Test debugfs PAT config vs getters
+ */
+static void pat_sanity(int fd)
+{
+	uint16_t dev_id = intel_get_drm_devid(fd);
+	struct intel_pat_cache pat_sw_config = {};
+	int32_t parsed;
+	bool has_uc_comp = false, has_wt = false;
+
+	parsed = xe_fetch_pat_sw_config(fd, &pat_sw_config);
+
+	if (intel_graphics_ver(dev_id) >= IP_VER(20, 0)) {
+		for (int i = 0; i < parsed; i++) {
+			uint32_t pat = pat_sw_config.entries[i].pat;
+			if (pat_sw_config.entries[i].rsvd)
+				continue;
+			if (!!(pat & XE2_COMP_EN) &&
+			    REG_FIELD_GET(XE2_L3_POLICY, pat) == L3_CACHE_POLICY_UC &&
+			    REG_FIELD_GET(XE2_L4_POLICY, pat) == L4_CACHE_POLICY_UC) {
+				has_uc_comp = true;
+			}
+			if (REG_FIELD_GET(XE2_L3_POLICY, pat) == L3_CACHE_POLICY_XD &&
+			    REG_FIELD_GET(XE2_L4_POLICY, pat) == L4_CACHE_POLICY_WT) {
+				has_wt = true;
+			}
+		}
+		if (has_uc_comp)
+			igt_assert_eq(pat_sw_config.uc_comp, intel_get_pat_idx_uc_comp(fd));
+	}
+	else {
+		has_wt = true;
+	}
+	igt_assert_eq(pat_sw_config.max_index, intel_get_max_pat_index(fd));
+	igt_assert_eq(pat_sw_config.uc, intel_get_pat_idx_uc(fd));
+	igt_assert_eq(pat_sw_config.wb, intel_get_pat_idx_wb(fd));
+	if (has_wt)
+		igt_assert_eq(pat_sw_config.wt, intel_get_pat_idx_wt(fd));
+}
 
 /**
  * SUBTEST: pat-index-all
@@ -1230,6 +1307,9 @@ int igt_main_args("V", NULL, help_str, opt_handler, NULL)
 		xe_device_get(fd);
 	}
 
+	igt_subtest("pat-sanity")
+		pat_sanity(fd);
+
 	igt_subtest("pat-index-all")
 		pat_index_all(fd);
 
-- 
2.43.0