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2024-05-10 23fa18eaa71266feff7ba8d83022d9e1cc83c65a 
 kernel/include/xen/interface/io/displif.h
....@@ -38,7 +38,8 @@
3838  *                           Protocol version
3939  ******************************************************************************
4040  */
41
-#define XENDISPL_PROTOCOL_VERSION	"1"
41
+#define XENDISPL_PROTOCOL_VERSION	"2"
42
+#define XENDISPL_PROTOCOL_VERSION_INT	 2
4243 
4344 /*
4445  ******************************************************************************
....@@ -202,6 +203,9 @@
202203  *      Width and height of the connector in pixels separated by
203204  *      XENDISPL_RESOLUTION_SEPARATOR. This defines visible area of the
204205  *      display.
206
+ *      If backend provides extended display identification data (EDID) with
207
+ *      XENDISPL_OP_GET_EDID request then EDID values must take precedence
208
+ *      over the resolutions defined here.
205209  *
206210  *------------------ Connector Request Transport Parameters -------------------
207211  *
....@@ -349,6 +353,8 @@
349353 #define XENDISPL_OP_FB_DETACH		0x13
350354 #define XENDISPL_OP_SET_CONFIG		0x14
351355 #define XENDISPL_OP_PG_FLIP		0x15
356
+/* The below command is available in protocol version 2 and above. */
357
+#define XENDISPL_OP_GET_EDID		0x16
352358 
353359 /*
354360  ******************************************************************************
....@@ -376,6 +382,10 @@
376382 #define XENDISPL_FIELD_RESOLUTION	"resolution"
377383 #define XENDISPL_FIELD_BE_ALLOC		"be-alloc"
378384 #define XENDISPL_FIELD_UNIQUE_ID	"unique-id"
385
+
386
+#define XENDISPL_EDID_BLOCK_SIZE	128
387
+#define XENDISPL_EDID_BLOCK_COUNT	256
388
+#define XENDISPL_EDID_MAX_SIZE		(XENDISPL_EDID_BLOCK_SIZE * XENDISPL_EDID_BLOCK_COUNT)
379389 
380390 /*
381391  ******************************************************************************
....@@ -451,7 +461,9 @@
451461  * +----------------+----------------+----------------+----------------+
452462  * |                           gref_directory                          | 40
453463  * +----------------+----------------+----------------+----------------+
454
- * |                             reserved                              | 44
464
+ * |                             data_ofs                              | 44
465
+ * +----------------+----------------+----------------+----------------+
466
+ * |                             reserved                              | 48
455467  * +----------------+----------------+----------------+----------------+
456468  * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
457469  * +----------------+----------------+----------------+----------------+
....@@ -494,6 +506,7 @@
494506  *   buffer size (buffer_sz) exceeds what can be addressed by this single page,
495507  *   then reference to the next page must be supplied (see gref_dir_next_page
496508  *   below)
509
+ * data_ofs - uint32_t, offset of the data in the buffer, octets
497510  */
498511 
499512 #define XENDISPL_DBUF_FLG_REQ_ALLOC	(1 << 0)
....@@ -506,6 +519,7 @@
506519 	uint32_t buffer_sz;
507520 	uint32_t flags;
508521 	grant_ref_t gref_directory;
522
+	uint32_t data_ofs;
509523 };
510524 
511525 /*
....@@ -732,6 +746,44 @@
732746 };
733747 
734748 /*
749
+ * Request EDID - request EDID describing current connector:
750
+ *         0                1                 2               3        octet
751
+ * +----------------+----------------+----------------+----------------+
752
+ * |               id                | _OP_GET_EDID   |   reserved     | 4
753
+ * +----------------+----------------+----------------+----------------+
754
+ * |                             buffer_sz                             | 8
755
+ * +----------------+----------------+----------------+----------------+
756
+ * |                          gref_directory                           | 12
757
+ * +----------------+----------------+----------------+----------------+
758
+ * |                             reserved                              | 16
759
+ * +----------------+----------------+----------------+----------------+
760
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
761
+ * +----------------+----------------+----------------+----------------+
762
+ * |                             reserved                              | 64
763
+ * +----------------+----------------+----------------+----------------+
764
+ *
765
+ * Notes:
766
+ *   - This command is not available in protocol version 1 and should be
767
+ *     ignored.
768
+ *   - This request is optional and if not supported then visible area
769
+ *     is defined by the relevant XenStore's "resolution" property.
770
+ *   - Shared buffer, allocated for EDID storage, must not be less then
771
+ *     XENDISPL_EDID_MAX_SIZE octets.
772
+ *
773
+ * buffer_sz - uint32_t, buffer size to be allocated, octets
774
+ * gref_directory - grant_ref_t, a reference to the first shared page
775
+ *   describing EDID buffer references. See XENDISPL_OP_DBUF_CREATE for
776
+ *   grant page directory structure (struct xendispl_page_directory).
777
+ *
778
+ * See response format for this request.
779
+ */
780
+
781
+struct xendispl_get_edid_req {
782
+	uint32_t buffer_sz;
783
+	grant_ref_t gref_directory;
784
+};
785
+
786
+/*
735787  *---------------------------------- Responses --------------------------------
736788  *
737789  * All response packets have the same length (64 octets)
....@@ -753,6 +805,35 @@
753805  * id - uint16_t, private guest value, echoed from request
754806  * status - int32_t, response status, zero on success and -XEN_EXX on failure
755807  *
808
+ *
809
+ * Get EDID response - response for XENDISPL_OP_GET_EDID:
810
+ *         0                1                 2               3        octet
811
+ * +----------------+----------------+----------------+----------------+
812
+ * |               id                |    operation   |    reserved    | 4
813
+ * +----------------+----------------+----------------+----------------+
814
+ * |                              status                               | 8
815
+ * +----------------+----------------+----------------+----------------+
816
+ * |                             edid_sz                               | 12
817
+ * +----------------+----------------+----------------+----------------+
818
+ * |                             reserved                              | 16
819
+ * +----------------+----------------+----------------+----------------+
820
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
821
+ * +----------------+----------------+----------------+----------------+
822
+ * |                             reserved                              | 64
823
+ * +----------------+----------------+----------------+----------------+
824
+ *
825
+ * Notes:
826
+ *   - This response is not available in protocol version 1 and should be
827
+ *     ignored.
828
+ *
829
+ * edid_sz - uint32_t, size of the EDID, octets
830
+ */
831
+
832
+struct xendispl_get_edid_resp {
833
+	uint32_t edid_sz;
834
+};
835
+
836
+/*
756837  *----------------------------------- Events ----------------------------------
757838  *
758839  * Events are sent via a shared page allocated by the front and propagated by
....@@ -804,6 +885,7 @@
804885 		struct xendispl_fb_detach_req fb_detach;
805886 		struct xendispl_set_config_req set_config;
806887 		struct xendispl_page_flip_req pg_flip;
888
+		struct xendispl_get_edid_req get_edid;
807889 		uint8_t reserved[56];
808890 	} op;
809891 };
....@@ -813,7 +895,10 @@
813895 	uint8_t operation;
814896 	uint8_t reserved;
815897 	int32_t status;
816
-	uint8_t reserved1[56];
898
+	union {
899
+		struct xendispl_get_edid_resp get_edid;
900
+		uint8_t reserved1[56];
901
+	} op;
817902 };
818903 
819904 struct xendispl_evt {