[PATCH v4 1/2] lib/igt_debugfs: Add specific checks for WA in GTs

[Mohammed Thasleem <mohammed.thasleem@intel.com>]

This function check the given workaround on available GTs.

v2: Add discription for return. (Kamil)
    Rename function to igt_has_intel_wa. (Kamil)
    Move lib changes to lib/igt_debugfs. (Kamil)
    Dump the whole wa sysfs file and then search for the wa. (Vinod)
    Use return true/false directly instead assigning value. (Vinod)
v3: Updated return type discription and debugfs_fd failure check. (Kamil)
    Return 0 or 1 instead of true or false. (Kamil)
v4: Add check for xe device before execution. (Vinod)

Signed-off-by: Mohammed Thasleem <mohammed.thasleem@intel.com>
Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>
---
 lib/igt_debugfs.c | 39 +++++++++++++++++++++++++++++++++++++++
 lib/igt_debugfs.h |  1 +
 2 files changed, 40 insertions(+)

diff --git a/lib/igt_debugfs.c b/lib/igt_debugfs.c
index 8ac215a76..5444c6f5f 100644
--- a/lib/igt_debugfs.c
+++ b/lib/igt_debugfs.c
@@ -44,6 +44,7 @@
 #include "igt_kms.h"
 #include "igt_debugfs.h"
 #include "igt_sysfs.h"
+#include "xe/xe_query.h"
 
 /**
  * SECTION:igt_debugfs
@@ -770,3 +771,41 @@ void __igt_debugfs_dump(int device, const char *filename, int level)
 	igt_log(IGT_LOG_DOMAIN, level, "%s:\n%s\n", filename, contents);
 	free(contents);
 }
+
+/**
+ * igt_has_intel_wa:
+ * @drm_fd:	A drm file descriptor
+ * @check_wa:	Workaround to be checked
+ *
+ * Returns:	0 if no WA, 1 if WA present, -1 on error
+ */
+int igt_has_intel_wa(int drm_fd, const char *check_wa)
+{
+	int debugfs_fd;
+	unsigned int xe;
+	char name[PATH_MAX];
+	char *debugfs_dump, *has_wa;
+
+	if (!is_xe_device(drm_fd))
+		return 0;
+
+	debugfs_fd = igt_debugfs_dir(drm_fd);
+	if (debugfs_fd == -1)
+		return -1;
+
+	xe_for_each_gt(drm_fd, xe) {
+		sprintf(name, "gt%d/workarounds", xe);
+		if (!igt_debugfs_exists(drm_fd, name, O_RDONLY))
+			return -1;
+
+		debugfs_dump = igt_sysfs_get(debugfs_fd, name);
+		if (debugfs_dump != NULL) {
+			has_wa = strstr(debugfs_dump, check_wa);
+			free(debugfs_dump);
+			if (has_wa)
+				return 1;
+		}
+	}
+
+	return 0;
+}
diff --git a/lib/igt_debugfs.h b/lib/igt_debugfs.h
index f4044d545..6d4c09d2f 100644
--- a/lib/igt_debugfs.h
+++ b/lib/igt_debugfs.h
@@ -49,6 +49,7 @@ bool igt_debugfs_search(int fd, const char *filename, const char *substring);
 int igt_debugfs_gt_dir(int device, unsigned int gt);
 int igt_debugfs_gt_open(int device, unsigned int gt, const char *filename,
 			int mode);
+int igt_has_intel_wa(int drm_fd, const char *check_wa);
 
 /**
  * igt_debugfs_read:
-- 
2.34.1