Merge tag 'for-linus-5.9-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull more xen updates from Juergen Gross:

 - Remove support for running as 32-bit Xen PV-guest.

   32-bit PV guests are rarely used, are lacking security fixes for
   Meltdown, and can be easily replaced by PVH mode. Another series for
   doing more cleanup will follow soon (removal of 32-bit-only pvops
   functionality).

 - Fixes and additional features for the Xen display frontend driver.

* tag 'for-linus-5.9-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  drm/xen-front: Pass dumb buffer data offset to the backend
  xen: Sync up with the canonical protocol definition in Xen
  drm/xen-front: Add YUYV to supported formats
  drm/xen-front: Fix misused IS_ERR_OR_NULL checks
  xen/gntdev: Fix dmabuf import with non-zero sgt offset
  x86/xen: drop tests for highmem in pv code
  x86/xen: eliminate xen-asm_64.S
  x86/xen: remove 32-bit Xen PV guest support

1 files changed, 88 insertions, 3 deletions

diff --git a/include/xen/interface/io/displif.h b/include/xen/interface/io/displif.h
index fdc279dc4a88..d43ca0361f86 100644
--- a/include/xen/interface/io/displif.h
+++ b/include/xen/interface/io/displif.h
@@ -38,7 +38,8 @@
  *                           Protocol version
  ******************************************************************************
  */
-#define XENDISPL_PROTOCOL_VERSION	"1"
+#define XENDISPL_PROTOCOL_VERSION	"2"
+#define XENDISPL_PROTOCOL_VERSION_INT	 2
 
 /*
  ******************************************************************************
@@ -202,6 +203,9 @@
  *      Width and height of the connector in pixels separated by
  *      XENDISPL_RESOLUTION_SEPARATOR. This defines visible area of the
  *      display.
+ *      If backend provides extended display identification data (EDID) with
+ *      XENDISPL_OP_GET_EDID request then EDID values must take precedence
+ *      over the resolutions defined here.
  *
  *------------------ Connector Request Transport Parameters -------------------
  *
@@ -349,6 +353,8 @@
 #define XENDISPL_OP_FB_DETACH		0x13
 #define XENDISPL_OP_SET_CONFIG		0x14
 #define XENDISPL_OP_PG_FLIP		0x15
+/* The below command is available in protocol version 2 and above. */
+#define XENDISPL_OP_GET_EDID		0x16
 
 /*
  ******************************************************************************
@@ -377,6 +383,10 @@
 #define XENDISPL_FIELD_BE_ALLOC		"be-alloc"
 #define XENDISPL_FIELD_UNIQUE_ID	"unique-id"
 
+#define XENDISPL_EDID_BLOCK_SIZE	128
+#define XENDISPL_EDID_BLOCK_COUNT	256
+#define XENDISPL_EDID_MAX_SIZE		(XENDISPL_EDID_BLOCK_SIZE * XENDISPL_EDID_BLOCK_COUNT)
+
 /*
  ******************************************************************************
  *                          STATUS RETURN CODES
@@ -451,7 +461,9 @@
  * +----------------+----------------+----------------+----------------+
  * |                           gref_directory                          | 40
  * +----------------+----------------+----------------+----------------+
- * |                             reserved                              | 44
+ * |                             data_ofs                              | 44
+ * +----------------+----------------+----------------+----------------+
+ * |                             reserved                              | 48
  * +----------------+----------------+----------------+----------------+
  * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
  * +----------------+----------------+----------------+----------------+
@@ -494,6 +506,7 @@
  *   buffer size (buffer_sz) exceeds what can be addressed by this single page,
  *   then reference to the next page must be supplied (see gref_dir_next_page
  *   below)
+ * data_ofs - uint32_t, offset of the data in the buffer, octets
  */
 
 #define XENDISPL_DBUF_FLG_REQ_ALLOC	(1 << 0)
@@ -506,6 +519,7 @@ struct xendispl_dbuf_create_req {
 	uint32_t buffer_sz;
 	uint32_t flags;
 	grant_ref_t gref_directory;
+	uint32_t data_ofs;
 };
 
 /*
@@ -732,6 +746,44 @@ struct xendispl_page_flip_req {
 };
 
 /*
+ * Request EDID - request EDID describing current connector:
+ *         0                1                 2               3        octet
+ * +----------------+----------------+----------------+----------------+
+ * |               id                | _OP_GET_EDID   |   reserved     | 4
+ * +----------------+----------------+----------------+----------------+
+ * |                             buffer_sz                             | 8
+ * +----------------+----------------+----------------+----------------+
+ * |                          gref_directory                           | 12
+ * +----------------+----------------+----------------+----------------+
+ * |                             reserved                              | 16
+ * +----------------+----------------+----------------+----------------+
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * |                             reserved                              | 64
+ * +----------------+----------------+----------------+----------------+
+ *
+ * Notes:
+ *   - This command is not available in protocol version 1 and should be
+ *     ignored.
+ *   - This request is optional and if not supported then visible area
+ *     is defined by the relevant XenStore's "resolution" property.
+ *   - Shared buffer, allocated for EDID storage, must not be less then
+ *     XENDISPL_EDID_MAX_SIZE octets.
+ *
+ * buffer_sz - uint32_t, buffer size to be allocated, octets
+ * gref_directory - grant_ref_t, a reference to the first shared page
+ *   describing EDID buffer references. See XENDISPL_OP_DBUF_CREATE for
+ *   grant page directory structure (struct xendispl_page_directory).
+ *
+ * See response format for this request.
+ */
+
+struct xendispl_get_edid_req {
+	uint32_t buffer_sz;
+	grant_ref_t gref_directory;
+};
+
+/*
  *---------------------------------- Responses --------------------------------
  *
  * All response packets have the same length (64 octets)
@@ -753,6 +805,35 @@ struct xendispl_page_flip_req {
  * id - uint16_t, private guest value, echoed from request
  * status - int32_t, response status, zero on success and -XEN_EXX on failure
  *
+ *
+ * Get EDID response - response for XENDISPL_OP_GET_EDID:
+ *         0                1                 2               3        octet
+ * +----------------+----------------+----------------+----------------+
+ * |               id                |    operation   |    reserved    | 4
+ * +----------------+----------------+----------------+----------------+
+ * |                              status                               | 8
+ * +----------------+----------------+----------------+----------------+
+ * |                             edid_sz                               | 12
+ * +----------------+----------------+----------------+----------------+
+ * |                             reserved                              | 16
+ * +----------------+----------------+----------------+----------------+
+ * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
+ * +----------------+----------------+----------------+----------------+
+ * |                             reserved                              | 64
+ * +----------------+----------------+----------------+----------------+
+ *
+ * Notes:
+ *   - This response is not available in protocol version 1 and should be
+ *     ignored.
+ *
+ * edid_sz - uint32_t, size of the EDID, octets
+ */
+
+struct xendispl_get_edid_resp {
+	uint32_t edid_sz;
+};
+
+/*
  *----------------------------------- Events ----------------------------------
  *
  * Events are sent via a shared page allocated by the front and propagated by
@@ -804,6 +885,7 @@ struct xendispl_req {
 		struct xendispl_fb_detach_req fb_detach;
 		struct xendispl_set_config_req set_config;
 		struct xendispl_page_flip_req pg_flip;
+		struct xendispl_get_edid_req get_edid;
 		uint8_t reserved[56];
 	} op;
 };
@@ -813,7 +895,10 @@ struct xendispl_resp {
 	uint8_t operation;
 	uint8_t reserved;
 	int32_t status;
-	uint8_t reserved1[56];
+	union {
+		struct xendispl_get_edid_resp get_edid;
+		uint8_t reserved1[56];
+	} op;
 };
 
 struct xendispl_evt {