Also, document DRM_I915_QUERY_HWCONFIG_BLOB with this struct.
v3:
* Add various changes suggested by Tvrtko
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Jordan Justen <jordan.l.justen@xxxxxxxxx>
Acked-by: Jon Bloomfield <jon.bloomfield@xxxxxxxxx>
---
include/uapi/drm/i915_drm.h | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 069d2fadfbd9..8279515ae2ce 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -3276,6 +3276,41 @@ struct drm_i915_gem_create_ext_protected_content {
__u32 flags;
};
+/**
+ * DOC: GuC HWCONFIG blob uAPI
+ *
+ * The GuC produces a blob with information about the current device.
+ * i915 reads this blob from GuC and makes it available via this uAPI.
+ *
+ * The returned blob is a sequence of items of variable length
+ * described by struct drm_i915_query_hwconfig_blob_item. The
+ * drm_i915_query_hwconfig_blob_item length field gives the length of
+ * the drm_i915_query_hwconfig_blob_item data[] array. The length is
+ * the number of u32 items in the data[] array, and *not* the number
+ * of bytes.
+ *
+ * The key and length fields are required, so the minimum item size is
+ * 2 x u32, or 8 bytes, when the length field is 0. If the length
+ * field is 1, then the item's size is 12 bytes.
+ *
+ * The overall blob returned by DRM_I915_QUERY_HWCONFIG_BLOB will end
+ * at the same location as the end of the final
+ * drm_i915_query_hwconfig_blob_item. In other words, walking through
+ * the individual items is guaranteed to eventually arrive at the
+ * exact end of the entire blob.
+ *
+ * The meaning of the key field and the data values are documented in
+ * the Programmer's Reference Manual.
+ */
+struct drm_i915_query_hwconfig_blob_item {
+ /** @key: Enum which defines how to interpret @data values. */
+ __u32 key;
+ /** @length: The number of u32 values in the @data array. */
+ __u32 length;
+ /** @key: Array of values with meaning defined by @key */
+ __u32 data[];
+};
+
/* ID of the protected content session managed by i915 when PXP is active */
#define I915_PROTECTED_CONTENT_DEFAULT_SESSION 0xf
--
2.34.1
