[PATCH 1/2] lib/xe_query: add xe_hwconfig_lookup_value() helper

[Maslak, Jan]

---
 lib/xe/xe_query.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++
 lib/xe/xe_query.h |  2 ++
 2 files changed, 58 insertions(+)

diff --git a/lib/xe/xe_query.c b/lib/xe/xe_query.c
index 0c9cff066..07d790f37 100644
--- a/lib/xe/xe_query.c
+++ b/lib/xe/xe_query.c
@@ -811,6 +811,62 @@ uint16_t xe_gt_get_tile_id(int fd, int gt)
 	return xe_dev->gt_list->gt_list[gt].tile_id;
 }
 
+/**
+ * xe_hwconfig_lookup_value:
+ * @fd: xe device fd
+ * @attribute: hwconfig attribute id
+ * @len: pointer to store length of the value
+ *
+ * Returns a pointer to the value of the hwconfig attribute @attribute and
+ * writes the length of the value to @len.
+ * The caller is responsible for freeing the returned pointer.
+ */
+uint32_t* xe_hwconfig_lookup_value(int fd, enum intel_hwconfig attribute, uint32_t* len)
+{
+	uint32_t *hwconfig;
+	uint32_t pos, hwconfig_len;
+	uint32_t *value = NULL;
+
+	struct drm_xe_device_query query = {
+		.extensions = 0,
+		.query = DRM_XE_DEVICE_QUERY_HWCONFIG,
+		.size = 0,
+		.data = 0,
+	};
+
+	/* Perform the initial query to get the size */
+	igt_assert_eq(igt_ioctl(fd, DRM_IOCTL_XE_DEVICE_QUERY, &query), 0);
+	igt_assert_neq(query.size, 0);
+
+	hwconfig = malloc(query.size);
+	igt_assert(hwconfig);
+
+	query.data = to_user_pointer(hwconfig);
+
+	/* Perform the query to get the actual data */
+	igt_assert_eq(igt_ioctl(fd, DRM_IOCTL_XE_DEVICE_QUERY, &query), 0);
+
+	/* Extract the value from the hwconfig */
+	pos = 0;
+	hwconfig_len = query.size / 4;
+	while (pos + 2 < hwconfig_len) {
+		uint32_t attribute_id = hwconfig[pos];
+		uint32_t attribute_len = hwconfig[pos + 1];
+		uint32_t* attribute_data = &hwconfig[pos + 2];
+		if (attribute_id == attribute) {
+			value = malloc(attribute_len * sizeof(uint32_t));
+			igt_assert(value);
+			memcpy(value, attribute_data, attribute_len * sizeof(uint32_t));
+			*len = attribute_len;
+			break;
+		}
+		pos += 2 + attribute_len;
+	}
+	
+	free(hwconfig);
+	return value;
+}
+
 igt_constructor
 {
 	xe_device_cache_init();
diff --git a/lib/xe/xe_query.h b/lib/xe/xe_query.h
index cabb8078c..580f82958 100644
--- a/lib/xe/xe_query.h
+++ b/lib/xe/xe_query.h
@@ -15,6 +15,7 @@
 #include "igt_aux.h"
 #include "igt_list.h"
 #include "igt_sizes.h"
+#include "intel_hwconfig_types.h"
 
 #define XE_DEFAULT_ALIGNMENT           SZ_4K
 #define XE_DEFAULT_ALIGNMENT_64K       SZ_64K
@@ -112,6 +113,7 @@ struct drm_xe_engine *xe_find_engine_by_class(int fd, uint16_t engine_class);
 bool xe_has_media_gt(int fd);
 bool xe_is_media_gt(int fd, int gt);
 uint16_t xe_gt_get_tile_id(int fd, int gt);
+uint32_t* xe_hwconfig_lookup_value(int fd, enum intel_hwconfig attribute, uint32_t* len);
 
 struct xe_device *xe_device_get(int fd);
 void xe_device_put(int fd);
-- 
2.34.1

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