[igt-dev] [PATCH i-g-t 1/3] lib/xe: Add support to reset all GT's

[janga.rahul.kumar at intel.com]

From: Janga Rahul Kumar <janga.rahul.kumar at intel.com>

Introduce xe gt library.

Add support to check GT reset and force reset all GT's.

Cc: Sai Gowtham Ch <sai.gowtham.ch at intel.com>
Cc: Kunal Joshi <kunal1.joshi at intel.com>
Cc: Kamil Konieczny <kamil.konieczny at linux.intel.com>
Cc: Anna Karas <anna.karas at intel.com>
Signed-off-by: Janga Rahul Kumar <janga.rahul.kumar at intel.com>
Tested-by: Kunal Joshi <kunal1.joshi at intel.com>
Reviewed-by: Sai Gowtham Ch <sai.gowtham.ch at intel.com>
---
 lib/meson.build |  1 +
 lib/xe/xe_gt.c  | 73 +++++++++++++++++++++++++++++++++++++++++++++++++
 lib/xe/xe_gt.h  | 11 ++++++++
 3 files changed, 85 insertions(+)
 create mode 100644 lib/xe/xe_gt.c
 create mode 100644 lib/xe/xe_gt.h

diff --git a/lib/meson.build b/lib/meson.build
index ce11c0715..b7bfcf4f0 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -103,6 +103,7 @@ lib_sources = [
 	'igt_dsc.c',
 	'xe/xe_compute.c',
 	'xe/xe_compute_square_kernels.c',
+	'xe/xe_gt.c',
 	'xe/xe_ioctl.c',
 	'xe/xe_query.c',
 	'xe/xe_spin.c',
diff --git a/lib/xe/xe_gt.c b/lib/xe/xe_gt.c
new file mode 100644
index 000000000..eb5a6c12a
--- /dev/null
+++ b/lib/xe/xe_gt.c
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2023 Intel Corporation
+ *
+ * Authors:
+ *    Janga Rahul Kumar <janga.rahul.kumar at intel.com>
+ */
+
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#include "igt_core.h"
+#include "igt_sysfs.h"
+#include "xe_gt.h"
+#include "xe_ioctl.h"
+#include "xe_query.h"
+
+#ifdef __linux__
+#include <sys/sysmacros.h>
+#else
+#define minor(__v__) ((__v__) & 0xff)
+#endif
+
+/**
+ * has_xe_gt_reset:
+ * @fd: open xe drm file descriptor
+ *
+ * Check gt force reset sysfs entry is available or not
+ *
+ * Returns: reset sysfs entry available
+ */
+bool has_xe_gt_reset(int fd)
+{
+	char reset_sysfs_path[100];
+	struct stat st;
+	int gt;
+	int reset_sysfs_fd = -1;
+	int sysfs_fd = -1;
+
+	igt_assert_eq(fstat(fd, &st), 0);
+	sysfs_fd = igt_sysfs_open(fd);
+
+	igt_assert(sysfs_fd != -1);
+	xe_for_each_gt(fd, gt) {
+		sprintf(reset_sysfs_path, "/sys/kernel/debug/dri/%d/gt%d/force_reset",
+				minor(st.st_rdev), gt);
+		reset_sysfs_fd = openat(sysfs_fd, reset_sysfs_path, O_RDONLY);
+
+		if (reset_sysfs_fd == -1) {
+			close(sysfs_fd);
+			return 0;
+		}
+
+		close(reset_sysfs_fd);
+	}
+
+	close(sysfs_fd);
+	return 1;
+}
+
+/**
+ * xe_force_gt_reset_all:
+ *
+ * Forces reset of all the GT's.
+ */
+void xe_force_gt_reset_all(int xe_fd)
+{
+	int gt;
+
+	xe_for_each_gt(xe_fd, gt)
+		xe_force_gt_reset(xe_fd, gt);
+}
+
diff --git a/lib/xe/xe_gt.h b/lib/xe/xe_gt.h
new file mode 100644
index 000000000..d05ed1ed5
--- /dev/null
+++ b/lib/xe/xe_gt.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2023 Intel Corporation
+ *
+ * Authors:
+ *    Janga Rahul Kumar <janga.rahul.kumar at intel.com>
+ */
+
+bool has_xe_gt_reset(int fd);
+void xe_force_gt_reset_all(int fd);
+
-- 
2.25.1