1 /* SPDX-License-Identifier: MIT */ 1 /* SPDX-License-Identifier: MIT */
2 /********************************************* 2 /******************************************************************************
3 * displif.h 3 * displif.h
4 * 4 *
5 * Unified display device I/O interface for Xe 5 * Unified display device I/O interface for Xen guest OSes.
6 * 6 *
7 * Copyright (C) 2016-2017 EPAM Systems Inc. 7 * Copyright (C) 2016-2017 EPAM Systems Inc.
8 * 8 *
9 * Authors: Oleksandr Andrushchenko <oleksandr 9 * Authors: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
10 * Oleksandr Grytsov <oleksandr_gryts 10 * Oleksandr Grytsov <oleksandr_grytsov@epam.com>
11 */ 11 */
12 12
13 #ifndef __XEN_PUBLIC_IO_DISPLIF_H__ 13 #ifndef __XEN_PUBLIC_IO_DISPLIF_H__
14 #define __XEN_PUBLIC_IO_DISPLIF_H__ 14 #define __XEN_PUBLIC_IO_DISPLIF_H__
15 15
16 #include "ring.h" 16 #include "ring.h"
17 #include "../grant_table.h" 17 #include "../grant_table.h"
18 18
19 /* 19 /*
20 ********************************************* 20 ******************************************************************************
21 * Protocol version 21 * Protocol version
22 ********************************************* 22 ******************************************************************************
23 */ 23 */
24 #define XENDISPL_PROTOCOL_VERSION "2" 24 #define XENDISPL_PROTOCOL_VERSION "2"
25 #define XENDISPL_PROTOCOL_VERSION_INT 2 25 #define XENDISPL_PROTOCOL_VERSION_INT 2
26 26
27 /* 27 /*
28 ********************************************* 28 ******************************************************************************
29 * Main features provided by 29 * Main features provided by the protocol
30 ********************************************* 30 ******************************************************************************
31 * This protocol aims to provide a unified pro 31 * This protocol aims to provide a unified protocol which fits more
32 * sophisticated use-cases than a framebuffer 32 * sophisticated use-cases than a framebuffer device can handle. At the
33 * moment basic functionality is supported wit 33 * moment basic functionality is supported with the intention to be extended:
34 * o multiple dynamically allocated/destroyed 34 * o multiple dynamically allocated/destroyed framebuffers
35 * o buffers of arbitrary sizes 35 * o buffers of arbitrary sizes
36 * o buffer allocation at either back or fron 36 * o buffer allocation at either back or front end
37 * o better configuration options including m 37 * o better configuration options including multiple display support
38 * 38 *
39 * Note: existing fbif can be used together wi 39 * Note: existing fbif can be used together with displif running at the
40 * same time, e.g. on Linux one provides frame 40 * same time, e.g. on Linux one provides framebuffer and another DRM/KMS
41 * 41 *
42 * Note: display resolution (XenStore's "resol 42 * Note: display resolution (XenStore's "resolution" property) defines
43 * visible area of the virtual display. At the 43 * visible area of the virtual display. At the same time resolution of
44 * the display and frame buffers may differ: b 44 * the display and frame buffers may differ: buffers can be smaller, equal
45 * or bigger than the visible area. This is to 45 * or bigger than the visible area. This is to enable use-cases, where backend
46 * may do some post-processing of the display 46 * may do some post-processing of the display and frame buffers supplied,
47 * e.g. those buffers can be just a part of th 47 * e.g. those buffers can be just a part of the final composition.
48 * 48 *
49 ********************************************* 49 ******************************************************************************
50 * Direction of improve 50 * Direction of improvements
51 ********************************************* 51 ******************************************************************************
52 * Future extensions to the existing protocol 52 * Future extensions to the existing protocol may include:
53 * o display/connector cloning 53 * o display/connector cloning
54 * o allocation of objects other than display 54 * o allocation of objects other than display buffers
55 * o plane/overlay support 55 * o plane/overlay support
56 * o scaling support 56 * o scaling support
57 * o rotation support 57 * o rotation support
58 * 58 *
59 ********************************************* 59 ******************************************************************************
60 * Feature and Parameter Nego 60 * Feature and Parameter Negotiation
61 ********************************************* 61 ******************************************************************************
62 * 62 *
63 * Front->back notifications: when enqueuing a 63 * Front->back notifications: when enqueuing a new request, sending a
64 * notification can be made conditional on xen 64 * notification can be made conditional on xendispl_req (i.e., the generic
65 * hold-off mechanism provided by the ring mac 65 * hold-off mechanism provided by the ring macros). Backends must set
66 * xendispl_req appropriately (e.g., using RIN 66 * xendispl_req appropriately (e.g., using RING_FINAL_CHECK_FOR_REQUESTS()).
67 * 67 *
68 * Back->front notifications: when enqueuing a 68 * Back->front notifications: when enqueuing a new response, sending a
69 * notification can be made conditional on xen 69 * notification can be made conditional on xendispl_resp (i.e., the generic
70 * hold-off mechanism provided by the ring mac 70 * hold-off mechanism provided by the ring macros). Frontends must set
71 * xendispl_resp appropriately (e.g., using RI 71 * xendispl_resp appropriately (e.g., using RING_FINAL_CHECK_FOR_RESPONSES()).
72 * 72 *
73 * The two halves of a para-virtual display dr 73 * The two halves of a para-virtual display driver utilize nodes within
74 * XenStore to communicate capabilities and to 74 * XenStore to communicate capabilities and to negotiate operating parameters.
75 * This section enumerates these nodes which r 75 * This section enumerates these nodes which reside in the respective front and
76 * backend portions of XenStore, following the 76 * backend portions of XenStore, following the XenBus convention.
77 * 77 *
78 * All data in XenStore is stored as strings. 78 * All data in XenStore is stored as strings. Nodes specifying numeric
79 * values are encoded in decimal. Integer valu 79 * values are encoded in decimal. Integer value ranges listed below are
80 * expressed as fixed sized integer types capa 80 * expressed as fixed sized integer types capable of storing the conversion
81 * of a properly formated node string, without 81 * of a properly formated node string, without loss of information.
82 * 82 *
83 ********************************************* 83 ******************************************************************************
84 * Example configuratio 84 * Example configuration
85 ********************************************* 85 ******************************************************************************
86 * 86 *
87 * Note: depending on the use-case backend can 87 * Note: depending on the use-case backend can expose more display connectors
88 * than the underlying HW physically has by em 88 * than the underlying HW physically has by employing SW graphics compositors
89 * 89 *
90 * This is an example of backend and frontend 90 * This is an example of backend and frontend configuration:
91 * 91 *
92 *--------------------------------- Backend -- 92 *--------------------------------- Backend -----------------------------------
93 * 93 *
94 * /local/domain/0/backend/vdispl/1/0/frontend 94 * /local/domain/0/backend/vdispl/1/0/frontend-id = "1"
95 * /local/domain/0/backend/vdispl/1/0/frontend 95 * /local/domain/0/backend/vdispl/1/0/frontend = "/local/domain/1/device/vdispl/0"
96 * /local/domain/0/backend/vdispl/1/0/state = 96 * /local/domain/0/backend/vdispl/1/0/state = "4"
97 * /local/domain/0/backend/vdispl/1/0/versions 97 * /local/domain/0/backend/vdispl/1/0/versions = "1,2"
98 * 98 *
99 *--------------------------------- Frontend - 99 *--------------------------------- Frontend ----------------------------------
100 * 100 *
101 * /local/domain/1/device/vdispl/0/backend-id 101 * /local/domain/1/device/vdispl/0/backend-id = ""
102 * /local/domain/1/device/vdispl/0/backend = " 102 * /local/domain/1/device/vdispl/0/backend = "/local/domain/0/backend/vdispl/1/0"
103 * /local/domain/1/device/vdispl/0/state = "4" 103 * /local/domain/1/device/vdispl/0/state = "4"
104 * /local/domain/1/device/vdispl/0/version = " 104 * /local/domain/1/device/vdispl/0/version = "1"
105 * /local/domain/1/device/vdispl/0/be-alloc = 105 * /local/domain/1/device/vdispl/0/be-alloc = "1"
106 * 106 *
107 *-------------------------- Connector 0 confi 107 *-------------------------- Connector 0 configuration ------------------------
108 * 108 *
109 * /local/domain/1/device/vdispl/0/0/resolutio 109 * /local/domain/1/device/vdispl/0/0/resolution = "1920x1080"
110 * /local/domain/1/device/vdispl/0/0/req-ring- 110 * /local/domain/1/device/vdispl/0/0/req-ring-ref = "2832"
111 * /local/domain/1/device/vdispl/0/0/req-event 111 * /local/domain/1/device/vdispl/0/0/req-event-channel = "15"
112 * /local/domain/1/device/vdispl/0/0/evt-ring- 112 * /local/domain/1/device/vdispl/0/0/evt-ring-ref = "387"
113 * /local/domain/1/device/vdispl/0/0/evt-event 113 * /local/domain/1/device/vdispl/0/0/evt-event-channel = "16"
114 * 114 *
115 *-------------------------- Connector 1 confi 115 *-------------------------- Connector 1 configuration ------------------------
116 * 116 *
117 * /local/domain/1/device/vdispl/0/1/resolutio 117 * /local/domain/1/device/vdispl/0/1/resolution = "800x600"
118 * /local/domain/1/device/vdispl/0/1/req-ring- 118 * /local/domain/1/device/vdispl/0/1/req-ring-ref = "2833"
119 * /local/domain/1/device/vdispl/0/1/req-event 119 * /local/domain/1/device/vdispl/0/1/req-event-channel = "17"
120 * /local/domain/1/device/vdispl/0/1/evt-ring- 120 * /local/domain/1/device/vdispl/0/1/evt-ring-ref = "388"
121 * /local/domain/1/device/vdispl/0/1/evt-event 121 * /local/domain/1/device/vdispl/0/1/evt-event-channel = "18"
122 * 122 *
123 ********************************************* 123 ******************************************************************************
124 * Backend XenBus N 124 * Backend XenBus Nodes
125 ********************************************* 125 ******************************************************************************
126 * 126 *
127 *----------------------------- Protocol versi 127 *----------------------------- Protocol version ------------------------------
128 * 128 *
129 * versions 129 * versions
130 * Values: <string> 130 * Values: <string>
131 * 131 *
132 * List of XENDISPL_LIST_SEPARATOR separa 132 * List of XENDISPL_LIST_SEPARATOR separated protocol versions supported
133 * by the backend. For example "1,2,3". 133 * by the backend. For example "1,2,3".
134 * 134 *
135 ********************************************* 135 ******************************************************************************
136 * Frontend XenBus 136 * Frontend XenBus Nodes
137 ********************************************* 137 ******************************************************************************
138 * 138 *
139 *-------------------------------- Addressing 139 *-------------------------------- Addressing ---------------------------------
140 * 140 *
141 * dom-id 141 * dom-id
142 * Values: <uint16_t> 142 * Values: <uint16_t>
143 * 143 *
144 * Domain identifier. 144 * Domain identifier.
145 * 145 *
146 * dev-id 146 * dev-id
147 * Values: <uint16_t> 147 * Values: <uint16_t>
148 * 148 *
149 * Device identifier. 149 * Device identifier.
150 * 150 *
151 * conn-idx 151 * conn-idx
152 * Values: <uint8_t> 152 * Values: <uint8_t>
153 * 153 *
154 * Zero based contigous index of the conn 154 * Zero based contigous index of the connector.
155 * /local/domain/<dom-id>/device/vdispl/< 155 * /local/domain/<dom-id>/device/vdispl/<dev-id>/<conn-idx>/...
156 * 156 *
157 *----------------------------- Protocol versi 157 *----------------------------- Protocol version ------------------------------
158 * 158 *
159 * version 159 * version
160 * Values: <string> 160 * Values: <string>
161 * 161 *
162 * Protocol version, chosen among the one 162 * Protocol version, chosen among the ones supported by the backend.
163 * 163 *
164 *------------------------- Backend buffer all 164 *------------------------- Backend buffer allocation -------------------------
165 * 165 *
166 * be-alloc 166 * be-alloc
167 * Values: "", "1" 167 * Values: "", "1"
168 * 168 *
169 * If value is set to "1", then backend c 169 * If value is set to "1", then backend can be a buffer provider/allocator
170 * for this domain during XENDISPL_OP_DBU 170 * for this domain during XENDISPL_OP_DBUF_CREATE operation (see below
171 * for negotiation). 171 * for negotiation).
172 * If value is not "1" or omitted fronten 172 * If value is not "1" or omitted frontend must allocate buffers itself.
173 * 173 *
174 *----------------------------- Connector sett 174 *----------------------------- Connector settings ----------------------------
175 * 175 *
176 * unique-id 176 * unique-id
177 * Values: <string> 177 * Values: <string>
178 * 178 *
179 * After device instance initialization e 179 * After device instance initialization each connector is assigned a
180 * unique ID, so it can be identified by 180 * unique ID, so it can be identified by the backend by this ID.
181 * This can be UUID or such. 181 * This can be UUID or such.
182 * 182 *
183 * resolution 183 * resolution
184 * Values: <width, uint32_t>x<hei 184 * Values: <width, uint32_t>x<height, uint32_t>
185 * 185 *
186 * Width and height of the connector in p 186 * Width and height of the connector in pixels separated by
187 * XENDISPL_RESOLUTION_SEPARATOR. This de 187 * XENDISPL_RESOLUTION_SEPARATOR. This defines visible area of the
188 * display. 188 * display.
189 * If backend provides extended display i 189 * If backend provides extended display identification data (EDID) with
190 * XENDISPL_OP_GET_EDID request then EDID 190 * XENDISPL_OP_GET_EDID request then EDID values must take precedence
191 * over the resolutions defined here. 191 * over the resolutions defined here.
192 * 192 *
193 *------------------ Connector Request Transpo 193 *------------------ Connector Request Transport Parameters -------------------
194 * 194 *
195 * This communication path is used to deliver 195 * This communication path is used to deliver requests from frontend to backend
196 * and get the corresponding responses from ba 196 * and get the corresponding responses from backend to frontend,
197 * set up per connector. 197 * set up per connector.
198 * 198 *
199 * req-event-channel 199 * req-event-channel
200 * Values: <uint32_t> 200 * Values: <uint32_t>
201 * 201 *
202 * The identifier of the Xen connector's 202 * The identifier of the Xen connector's control event channel
203 * used to signal activity in the ring bu 203 * used to signal activity in the ring buffer.
204 * 204 *
205 * req-ring-ref 205 * req-ring-ref
206 * Values: <uint32_t> 206 * Values: <uint32_t>
207 * 207 *
208 * The Xen grant reference granting permi 208 * The Xen grant reference granting permission for the backend to map
209 * a sole page of connector's control rin 209 * a sole page of connector's control ring buffer.
210 * 210 *
211 *------------------- Connector Event Transpor 211 *------------------- Connector Event Transport Parameters --------------------
212 * 212 *
213 * This communication path is used to deliver 213 * This communication path is used to deliver asynchronous events from backend
214 * to frontend, set up per connector. 214 * to frontend, set up per connector.
215 * 215 *
216 * evt-event-channel 216 * evt-event-channel
217 * Values: <uint32_t> 217 * Values: <uint32_t>
218 * 218 *
219 * The identifier of the Xen connector's 219 * The identifier of the Xen connector's event channel
220 * used to signal activity in the ring bu 220 * used to signal activity in the ring buffer.
221 * 221 *
222 * evt-ring-ref 222 * evt-ring-ref
223 * Values: <uint32_t> 223 * Values: <uint32_t>
224 * 224 *
225 * The Xen grant reference granting permi 225 * The Xen grant reference granting permission for the backend to map
226 * a sole page of connector's event ring 226 * a sole page of connector's event ring buffer.
227 */ 227 */
228 228
229 /* 229 /*
230 ********************************************* 230 ******************************************************************************
231 * STATE DIAGRAM 231 * STATE DIAGRAMS
232 ********************************************* 232 ******************************************************************************
233 * 233 *
234 * Tool stack creates front and back state nod 234 * Tool stack creates front and back state nodes with initial state
235 * XenbusStateInitialising. 235 * XenbusStateInitialising.
236 * Tool stack creates and sets up frontend dis 236 * Tool stack creates and sets up frontend display configuration
237 * nodes per domain. 237 * nodes per domain.
238 * 238 *
239 *-------------------------------- Normal flow 239 *-------------------------------- Normal flow --------------------------------
240 * 240 *
241 * Front Back 241 * Front Back
242 * ================================= ====== 242 * ================================= =====================================
243 * XenbusStateInitialising Xenbus 243 * XenbusStateInitialising XenbusStateInitialising
244 * o Que 244 * o Query backend device identification
245 * dat 245 * data.
246 * o Ope 246 * o Open and validate backend device.
247 * 247 * |
248 * 248 * |
249 * 249 * V
250 * Xenbus 250 * XenbusStateInitWait
251 * 251 *
252 * o Query frontend configuration 252 * o Query frontend configuration
253 * o Allocate and initialize 253 * o Allocate and initialize
254 * event channels per configured 254 * event channels per configured
255 * connector. 255 * connector.
256 * o Publish transport parameters 256 * o Publish transport parameters
257 * that will be in effect during 257 * that will be in effect during
258 * this connection. 258 * this connection.
259 * | 259 * |
260 * | 260 * |
261 * V 261 * V
262 * XenbusStateInitialised 262 * XenbusStateInitialised
263 * 263 *
264 * o Que 264 * o Query frontend transport parameters.
265 * o Con 265 * o Connect to the event channels.
266 * 266 * |
267 * 267 * |
268 * 268 * V
269 * Xenbus 269 * XenbusStateConnected
270 * 270 *
271 * o Create and initialize OS 271 * o Create and initialize OS
272 * virtual display connectors 272 * virtual display connectors
273 * as per configuration. 273 * as per configuration.
274 * | 274 * |
275 * | 275 * |
276 * V 276 * V
277 * XenbusStateConnected 277 * XenbusStateConnected
278 * 278 *
279 * Xenbus 279 * XenbusStateUnknown
280 * Xenbus 280 * XenbusStateClosed
281 * Xenbus 281 * XenbusStateClosing
282 * o Remove virtual display device 282 * o Remove virtual display device
283 * o Remove event channels 283 * o Remove event channels
284 * | 284 * |
285 * | 285 * |
286 * V 286 * V
287 * XenbusStateClosed 287 * XenbusStateClosed
288 * 288 *
289 *------------------------------- Recovery flo 289 *------------------------------- Recovery flow -------------------------------
290 * 290 *
291 * In case of frontend unrecoverable errors ba 291 * In case of frontend unrecoverable errors backend handles that as
292 * if frontend goes into the XenbusStateClosed 292 * if frontend goes into the XenbusStateClosed state.
293 * 293 *
294 * In case of backend unrecoverable errors fro 294 * In case of backend unrecoverable errors frontend tries removing
295 * the virtualized device. If this is possible 295 * the virtualized device. If this is possible at the moment of error,
296 * then frontend goes into the XenbusStateInit 296 * then frontend goes into the XenbusStateInitialising state and is ready for
297 * new connection with backend. If the virtual 297 * new connection with backend. If the virtualized device is still in use and
298 * cannot be removed, then frontend goes into 298 * cannot be removed, then frontend goes into the XenbusStateReconfiguring state
299 * until either the virtualized device is remo 299 * until either the virtualized device is removed or backend initiates a new
300 * connection. On the virtualized device remov 300 * connection. On the virtualized device removal frontend goes into the
301 * XenbusStateInitialising state. 301 * XenbusStateInitialising state.
302 * 302 *
303 * Note on XenbusStateReconfiguring state of t 303 * Note on XenbusStateReconfiguring state of the frontend: if backend has
304 * unrecoverable errors then frontend cannot s 304 * unrecoverable errors then frontend cannot send requests to the backend
305 * and thus cannot provide functionality of th 305 * and thus cannot provide functionality of the virtualized device anymore.
306 * After backend is back to normal the virtual 306 * After backend is back to normal the virtualized device may still hold some
307 * state: configuration in use, allocated buff 307 * state: configuration in use, allocated buffers, client application state etc.
308 * In most cases, this will require frontend t 308 * In most cases, this will require frontend to implement complex recovery
309 * reconnect logic. Instead, by going into Xen 309 * reconnect logic. Instead, by going into XenbusStateReconfiguring state,
310 * frontend will make sure no new clients of t 310 * frontend will make sure no new clients of the virtualized device are
311 * accepted, allow existing client(s) to exit 311 * accepted, allow existing client(s) to exit gracefully by signaling error
312 * state etc. 312 * state etc.
313 * Once all the clients are gone frontend can 313 * Once all the clients are gone frontend can reinitialize the virtualized
314 * device and get into XenbusStateInitialising 314 * device and get into XenbusStateInitialising state again signaling the
315 * backend that a new connection can be made. 315 * backend that a new connection can be made.
316 * 316 *
317 * There are multiple conditions possible unde 317 * There are multiple conditions possible under which frontend will go from
318 * XenbusStateReconfiguring into XenbusStateIn 318 * XenbusStateReconfiguring into XenbusStateInitialising, some of them are OS
319 * specific. For example: 319 * specific. For example:
320 * 1. The underlying OS framework may provide 320 * 1. The underlying OS framework may provide callbacks to signal that the last
321 * client of the virtualized device has gon 321 * client of the virtualized device has gone and the device can be removed
322 * 2. Frontend can schedule a deferred work (t 322 * 2. Frontend can schedule a deferred work (timer/tasklet/workqueue)
323 * to periodically check if this is the rig 323 * to periodically check if this is the right time to re-try removal of
324 * the virtualized device. 324 * the virtualized device.
325 * 3. By any other means. 325 * 3. By any other means.
326 * 326 *
327 ********************************************* 327 ******************************************************************************
328 * REQUEST CODES 328 * REQUEST CODES
329 ********************************************* 329 ******************************************************************************
330 * Request codes [0; 15] are reserved and must 330 * Request codes [0; 15] are reserved and must not be used
331 */ 331 */
332 332
333 #define XENDISPL_OP_DBUF_CREATE 0x10 333 #define XENDISPL_OP_DBUF_CREATE 0x10
334 #define XENDISPL_OP_DBUF_DESTROY 0x11 334 #define XENDISPL_OP_DBUF_DESTROY 0x11
335 #define XENDISPL_OP_FB_ATTACH 0x12 335 #define XENDISPL_OP_FB_ATTACH 0x12
336 #define XENDISPL_OP_FB_DETACH 0x13 336 #define XENDISPL_OP_FB_DETACH 0x13
337 #define XENDISPL_OP_SET_CONFIG 0x14 337 #define XENDISPL_OP_SET_CONFIG 0x14
338 #define XENDISPL_OP_PG_FLIP 0x15 338 #define XENDISPL_OP_PG_FLIP 0x15
339 /* The below command is available in protocol 339 /* The below command is available in protocol version 2 and above. */
340 #define XENDISPL_OP_GET_EDID 0x16 340 #define XENDISPL_OP_GET_EDID 0x16
341 341
342 /* 342 /*
343 ********************************************* 343 ******************************************************************************
344 * EVENT CODES 344 * EVENT CODES
345 ********************************************* 345 ******************************************************************************
346 */ 346 */
347 #define XENDISPL_EVT_PG_FLIP 0x00 347 #define XENDISPL_EVT_PG_FLIP 0x00
348 348
349 /* 349 /*
350 ********************************************* 350 ******************************************************************************
351 * XENSTORE FIELD AND PATH NAME 351 * XENSTORE FIELD AND PATH NAME STRINGS, HELPERS
352 ********************************************* 352 ******************************************************************************
353 */ 353 */
354 #define XENDISPL_DRIVER_NAME "vdisp 354 #define XENDISPL_DRIVER_NAME "vdispl"
355 355
356 #define XENDISPL_LIST_SEPARATOR "," 356 #define XENDISPL_LIST_SEPARATOR ","
357 #define XENDISPL_RESOLUTION_SEPARATOR "x" 357 #define XENDISPL_RESOLUTION_SEPARATOR "x"
358 358
359 #define XENDISPL_FIELD_BE_VERSIONS "versi 359 #define XENDISPL_FIELD_BE_VERSIONS "versions"
360 #define XENDISPL_FIELD_FE_VERSION "versi 360 #define XENDISPL_FIELD_FE_VERSION "version"
361 #define XENDISPL_FIELD_REQ_RING_REF "req-r 361 #define XENDISPL_FIELD_REQ_RING_REF "req-ring-ref"
362 #define XENDISPL_FIELD_REQ_CHANNEL "req-e 362 #define XENDISPL_FIELD_REQ_CHANNEL "req-event-channel"
363 #define XENDISPL_FIELD_EVT_RING_REF "evt-r 363 #define XENDISPL_FIELD_EVT_RING_REF "evt-ring-ref"
364 #define XENDISPL_FIELD_EVT_CHANNEL "evt-e 364 #define XENDISPL_FIELD_EVT_CHANNEL "evt-event-channel"
365 #define XENDISPL_FIELD_RESOLUTION "resol 365 #define XENDISPL_FIELD_RESOLUTION "resolution"
366 #define XENDISPL_FIELD_BE_ALLOC "be-al 366 #define XENDISPL_FIELD_BE_ALLOC "be-alloc"
367 #define XENDISPL_FIELD_UNIQUE_ID "uniqu 367 #define XENDISPL_FIELD_UNIQUE_ID "unique-id"
368 368
369 #define XENDISPL_EDID_BLOCK_SIZE 128 369 #define XENDISPL_EDID_BLOCK_SIZE 128
370 #define XENDISPL_EDID_BLOCK_COUNT 256 370 #define XENDISPL_EDID_BLOCK_COUNT 256
371 #define XENDISPL_EDID_MAX_SIZE (XENDI 371 #define XENDISPL_EDID_MAX_SIZE (XENDISPL_EDID_BLOCK_SIZE * XENDISPL_EDID_BLOCK_COUNT)
372 372
373 /* 373 /*
374 ********************************************* 374 ******************************************************************************
375 * STATUS RETURN CODE 375 * STATUS RETURN CODES
376 ********************************************* 376 ******************************************************************************
377 * 377 *
378 * Status return code is zero on success and - 378 * Status return code is zero on success and -XEN_EXX on failure.
379 * 379 *
380 ********************************************* 380 ******************************************************************************
381 * Assumptions 381 * Assumptions
382 ********************************************* 382 ******************************************************************************
383 * o usage of grant reference 0 as invalid gra 383 * o usage of grant reference 0 as invalid grant reference:
384 * grant reference 0 is valid, but never exp 384 * grant reference 0 is valid, but never exposed to a PV driver,
385 * because of the fact it is already in use/ 385 * because of the fact it is already in use/reserved by the PV console.
386 * o all references in this document to page s 386 * o all references in this document to page sizes must be treated
387 * as pages of size XEN_PAGE_SIZE unless oth 387 * as pages of size XEN_PAGE_SIZE unless otherwise noted.
388 * 388 *
389 ********************************************* 389 ******************************************************************************
390 * Description of the protocol between f 390 * Description of the protocol between frontend and backend driver
391 ********************************************* 391 ******************************************************************************
392 * 392 *
393 * The two halves of a Para-virtual display dr 393 * The two halves of a Para-virtual display driver communicate with
394 * each other using shared pages and event cha 394 * each other using shared pages and event channels.
395 * Shared page contains a ring with request/re 395 * Shared page contains a ring with request/response packets.
396 * 396 *
397 * All reserved fields in the structures below 397 * All reserved fields in the structures below must be 0.
398 * Display buffers's cookie of value 0 is trea 398 * Display buffers's cookie of value 0 is treated as invalid.
399 * Framebuffer's cookie of value 0 is treated 399 * Framebuffer's cookie of value 0 is treated as invalid.
400 * 400 *
401 * For all request/response/event packets that 401 * For all request/response/event packets that use cookies:
402 * dbuf_cookie - uint64_t, unique to guest d 402 * dbuf_cookie - uint64_t, unique to guest domain value used by the backend
403 * to map remote display buffer to its loc 403 * to map remote display buffer to its local one
404 * fb_cookie - uint64_t, unique to guest dom 404 * fb_cookie - uint64_t, unique to guest domain value used by the backend
405 * to map remote framebuffer to its local 405 * to map remote framebuffer to its local one
406 * 406 *
407 *---------------------------------- Requests 407 *---------------------------------- Requests ---------------------------------
408 * 408 *
409 * All requests/responses, which are not conne 409 * All requests/responses, which are not connector specific, must be sent over
410 * control ring of the connector which has the 410 * control ring of the connector which has the index value of 0:
411 * /local/domain/<dom-id>/device/vdispl/<dev 411 * /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
412 * 412 *
413 * All request packets have the same length (6 413 * All request packets have the same length (64 octets)
414 * All request packets have common header: 414 * All request packets have common header:
415 * 0 1 415 * 0 1 2 3 octet
416 * +----------------+----------------+-------- 416 * +----------------+----------------+----------------+----------------+
417 * | id | oper 417 * | id | operation | reserved | 4
418 * +----------------+----------------+-------- 418 * +----------------+----------------+----------------+----------------+
419 * | reserved 419 * | reserved | 8
420 * +----------------+----------------+-------- 420 * +----------------+----------------+----------------+----------------+
421 * id - uint16_t, private guest value, echoe 421 * id - uint16_t, private guest value, echoed in response
422 * operation - uint8_t, operation code, XEND 422 * operation - uint8_t, operation code, XENDISPL_OP_???
423 * 423 *
424 * Request dbuf creation - request creation of 424 * Request dbuf creation - request creation of a display buffer.
425 * 0 1 425 * 0 1 2 3 octet
426 * +----------------+----------------+-------- 426 * +----------------+----------------+----------------+----------------+
427 * | id |_OP_DBUF 427 * | id |_OP_DBUF_CREATE | reserved | 4
428 * +----------------+----------------+-------- 428 * +----------------+----------------+----------------+----------------+
429 * | reserved 429 * | reserved | 8
430 * +----------------+----------------+-------- 430 * +----------------+----------------+----------------+----------------+
431 * | dbuf_cookie low 32- 431 * | dbuf_cookie low 32-bit | 12
432 * +----------------+----------------+-------- 432 * +----------------+----------------+----------------+----------------+
433 * | dbuf_cookie high 32 433 * | dbuf_cookie high 32-bit | 16
434 * +----------------+----------------+-------- 434 * +----------------+----------------+----------------+----------------+
435 * | width 435 * | width | 20
436 * +----------------+----------------+-------- 436 * +----------------+----------------+----------------+----------------+
437 * | height 437 * | height | 24
438 * +----------------+----------------+-------- 438 * +----------------+----------------+----------------+----------------+
439 * | bpp 439 * | bpp | 28
440 * +----------------+----------------+-------- 440 * +----------------+----------------+----------------+----------------+
441 * | buffer_sz 441 * | buffer_sz | 32
442 * +----------------+----------------+-------- 442 * +----------------+----------------+----------------+----------------+
443 * | flags 443 * | flags | 36
444 * +----------------+----------------+-------- 444 * +----------------+----------------+----------------+----------------+
445 * | gref_directory 445 * | gref_directory | 40
446 * +----------------+----------------+-------- 446 * +----------------+----------------+----------------+----------------+
447 * | data_ofs 447 * | data_ofs | 44
448 * +----------------+----------------+-------- 448 * +----------------+----------------+----------------+----------------+
449 * | reserved 449 * | reserved | 48
450 * +----------------+----------------+-------- 450 * +----------------+----------------+----------------+----------------+
451 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 451 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
452 * +----------------+----------------+-------- 452 * +----------------+----------------+----------------+----------------+
453 * | reserved 453 * | reserved | 64
454 * +----------------+----------------+-------- 454 * +----------------+----------------+----------------+----------------+
455 * 455 *
456 * Must be sent over control ring of the conne 456 * Must be sent over control ring of the connector which has the index
457 * value of 0: 457 * value of 0:
458 * /local/domain/<dom-id>/device/vdispl/<dev 458 * /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
459 * All unused bits in flags field must be set 459 * All unused bits in flags field must be set to 0.
460 * 460 *
461 * An attempt to create multiple display buffe 461 * An attempt to create multiple display buffers with the same dbuf_cookie is
462 * an error. dbuf_cookie can be re-used after 462 * an error. dbuf_cookie can be re-used after destroying the corresponding
463 * display buffer. 463 * display buffer.
464 * 464 *
465 * Width and height of the display buffers can 465 * Width and height of the display buffers can be smaller, equal or bigger
466 * than the connector's resolution. Depth/pixe 466 * than the connector's resolution. Depth/pixel format of the individual
467 * buffers can differ as well. 467 * buffers can differ as well.
468 * 468 *
469 * width - uint32_t, width in pixels 469 * width - uint32_t, width in pixels
470 * height - uint32_t, height in pixels 470 * height - uint32_t, height in pixels
471 * bpp - uint32_t, bits per pixel 471 * bpp - uint32_t, bits per pixel
472 * buffer_sz - uint32_t, buffer size to be all 472 * buffer_sz - uint32_t, buffer size to be allocated, octets
473 * flags - uint32_t, flags of the operation 473 * flags - uint32_t, flags of the operation
474 * o XENDISPL_DBUF_FLG_REQ_ALLOC - if set, t 474 * o XENDISPL_DBUF_FLG_REQ_ALLOC - if set, then backend is requested
475 * to allocate the buffer with the paramet 475 * to allocate the buffer with the parameters provided in this request.
476 * Page directory is handled as follows: 476 * Page directory is handled as follows:
477 * Frontend on request: 477 * Frontend on request:
478 * o allocates pages for the directory 478 * o allocates pages for the directory (gref_directory,
479 * gref_dir_next_page(s) 479 * gref_dir_next_page(s)
480 * o grants permissions for the pages 480 * o grants permissions for the pages of the directory to the backend
481 * o sets gref_dir_next_page fields 481 * o sets gref_dir_next_page fields
482 * Backend on response: 482 * Backend on response:
483 * o grants permissions for the pages 483 * o grants permissions for the pages of the buffer allocated to
484 * the frontend 484 * the frontend
485 * o fills in page directory with gran 485 * o fills in page directory with grant references
486 * (gref[] in struct xendispl_page_d 486 * (gref[] in struct xendispl_page_directory)
487 * gref_directory - grant_ref_t, a reference t 487 * gref_directory - grant_ref_t, a reference to the first shared page
488 * describing shared buffer references. At l 488 * describing shared buffer references. At least one page exists. If shared
489 * buffer size (buffer_sz) exceeds what can 489 * buffer size (buffer_sz) exceeds what can be addressed by this single page,
490 * then reference to the next page must be s 490 * then reference to the next page must be supplied (see gref_dir_next_page
491 * below) 491 * below)
492 * data_ofs - uint32_t, offset of the data in 492 * data_ofs - uint32_t, offset of the data in the buffer, octets
493 */ 493 */
494 494
495 #define XENDISPL_DBUF_FLG_REQ_ALLOC (1 << 495 #define XENDISPL_DBUF_FLG_REQ_ALLOC (1 << 0)
496 496
497 struct xendispl_dbuf_create_req { 497 struct xendispl_dbuf_create_req {
498 uint64_t dbuf_cookie; 498 uint64_t dbuf_cookie;
499 uint32_t width; 499 uint32_t width;
500 uint32_t height; 500 uint32_t height;
501 uint32_t bpp; 501 uint32_t bpp;
502 uint32_t buffer_sz; 502 uint32_t buffer_sz;
503 uint32_t flags; 503 uint32_t flags;
504 grant_ref_t gref_directory; 504 grant_ref_t gref_directory;
505 uint32_t data_ofs; 505 uint32_t data_ofs;
506 }; 506 };
507 507
508 /* 508 /*
509 * Shared page for XENDISPL_OP_DBUF_CREATE buf 509 * Shared page for XENDISPL_OP_DBUF_CREATE buffer descriptor (gref_directory in
510 * the request) employs a list of pages, descr 510 * the request) employs a list of pages, describing all pages of the shared
511 * data buffer: 511 * data buffer:
512 * 0 1 512 * 0 1 2 3 octet
513 * +----------------+----------------+-------- 513 * +----------------+----------------+----------------+----------------+
514 * | gref_dir_next_page 514 * | gref_dir_next_page | 4
515 * +----------------+----------------+-------- 515 * +----------------+----------------+----------------+----------------+
516 * | gref[0] 516 * | gref[0] | 8
517 * +----------------+----------------+-------- 517 * +----------------+----------------+----------------+----------------+
518 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 518 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
519 * +----------------+----------------+-------- 519 * +----------------+----------------+----------------+----------------+
520 * | gref[i] 520 * | gref[i] | i*4+8
521 * +----------------+----------------+-------- 521 * +----------------+----------------+----------------+----------------+
522 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 522 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
523 * +----------------+----------------+-------- 523 * +----------------+----------------+----------------+----------------+
524 * | gref[N - 1] 524 * | gref[N - 1] | N*4+8
525 * +----------------+----------------+-------- 525 * +----------------+----------------+----------------+----------------+
526 * 526 *
527 * gref_dir_next_page - grant_ref_t, reference 527 * gref_dir_next_page - grant_ref_t, reference to the next page describing
528 * page directory. Must be 0 if there are no 528 * page directory. Must be 0 if there are no more pages in the list.
529 * gref[i] - grant_ref_t, reference to a share 529 * gref[i] - grant_ref_t, reference to a shared page of the buffer
530 * allocated at XENDISPL_OP_DBUF_CREATE 530 * allocated at XENDISPL_OP_DBUF_CREATE
531 * 531 *
532 * Number of grant_ref_t entries in the whole 532 * Number of grant_ref_t entries in the whole page directory is not
533 * passed, but instead can be calculated as: 533 * passed, but instead can be calculated as:
534 * num_grefs_total = (XENDISPL_OP_DBUF_CREAT 534 * num_grefs_total = (XENDISPL_OP_DBUF_CREATE.buffer_sz + XEN_PAGE_SIZE - 1) /
535 * XEN_PAGE_SIZE 535 * XEN_PAGE_SIZE
536 */ 536 */
537 537
538 struct xendispl_page_directory { 538 struct xendispl_page_directory {
539 grant_ref_t gref_dir_next_page; 539 grant_ref_t gref_dir_next_page;
540 grant_ref_t gref[]; 540 grant_ref_t gref[];
541 }; 541 };
542 542
543 /* 543 /*
544 * Request dbuf destruction - destroy a previo 544 * Request dbuf destruction - destroy a previously allocated display buffer:
545 * 0 1 545 * 0 1 2 3 octet
546 * +----------------+----------------+-------- 546 * +----------------+----------------+----------------+----------------+
547 * | id |_OP_DBUF 547 * | id |_OP_DBUF_DESTROY| reserved | 4
548 * +----------------+----------------+-------- 548 * +----------------+----------------+----------------+----------------+
549 * | reserved 549 * | reserved | 8
550 * +----------------+----------------+-------- 550 * +----------------+----------------+----------------+----------------+
551 * | dbuf_cookie low 32- 551 * | dbuf_cookie low 32-bit | 12
552 * +----------------+----------------+-------- 552 * +----------------+----------------+----------------+----------------+
553 * | dbuf_cookie high 32 553 * | dbuf_cookie high 32-bit | 16
554 * +----------------+----------------+-------- 554 * +----------------+----------------+----------------+----------------+
555 * | reserved 555 * | reserved | 20
556 * +----------------+----------------+-------- 556 * +----------------+----------------+----------------+----------------+
557 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 557 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
558 * +----------------+----------------+-------- 558 * +----------------+----------------+----------------+----------------+
559 * | reserved 559 * | reserved | 64
560 * +----------------+----------------+-------- 560 * +----------------+----------------+----------------+----------------+
561 * 561 *
562 * Must be sent over control ring of the conne 562 * Must be sent over control ring of the connector which has the index
563 * value of 0: 563 * value of 0:
564 * /local/domain/<dom-id>/device/vdispl/<dev 564 * /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
565 */ 565 */
566 566
567 struct xendispl_dbuf_destroy_req { 567 struct xendispl_dbuf_destroy_req {
568 uint64_t dbuf_cookie; 568 uint64_t dbuf_cookie;
569 }; 569 };
570 570
571 /* 571 /*
572 * Request framebuffer attachment - request at 572 * Request framebuffer attachment - request attachment of a framebuffer to
573 * previously created display buffer. 573 * previously created display buffer.
574 * 0 1 574 * 0 1 2 3 octet
575 * +----------------+----------------+-------- 575 * +----------------+----------------+----------------+----------------+
576 * | id | _OP_FB_ 576 * | id | _OP_FB_ATTACH | reserved | 4
577 * +----------------+----------------+-------- 577 * +----------------+----------------+----------------+----------------+
578 * | reserved 578 * | reserved | 8
579 * +----------------+----------------+-------- 579 * +----------------+----------------+----------------+----------------+
580 * | dbuf_cookie low 32- 580 * | dbuf_cookie low 32-bit | 12
581 * +----------------+----------------+-------- 581 * +----------------+----------------+----------------+----------------+
582 * | dbuf_cookie high 32 582 * | dbuf_cookie high 32-bit | 16
583 * +----------------+----------------+-------- 583 * +----------------+----------------+----------------+----------------+
584 * | fb_cookie low 32-b 584 * | fb_cookie low 32-bit | 20
585 * +----------------+----------------+-------- 585 * +----------------+----------------+----------------+----------------+
586 * | fb_cookie high 32- 586 * | fb_cookie high 32-bit | 24
587 * +----------------+----------------+-------- 587 * +----------------+----------------+----------------+----------------+
588 * | width 588 * | width | 28
589 * +----------------+----------------+-------- 589 * +----------------+----------------+----------------+----------------+
590 * | height 590 * | height | 32
591 * +----------------+----------------+-------- 591 * +----------------+----------------+----------------+----------------+
592 * | pixel_format 592 * | pixel_format | 36
593 * +----------------+----------------+-------- 593 * +----------------+----------------+----------------+----------------+
594 * | reserved 594 * | reserved | 40
595 * +----------------+----------------+-------- 595 * +----------------+----------------+----------------+----------------+
596 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 596 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
597 * +----------------+----------------+-------- 597 * +----------------+----------------+----------------+----------------+
598 * | reserved 598 * | reserved | 64
599 * +----------------+----------------+-------- 599 * +----------------+----------------+----------------+----------------+
600 * 600 *
601 * Must be sent over control ring of the conne 601 * Must be sent over control ring of the connector which has the index
602 * value of 0: 602 * value of 0:
603 * /local/domain/<dom-id>/device/vdispl/<dev 603 * /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
604 * Width and height can be smaller, equal or b 604 * Width and height can be smaller, equal or bigger than the connector's
605 * resolution. 605 * resolution.
606 * 606 *
607 * An attempt to create multiple frame buffers 607 * An attempt to create multiple frame buffers with the same fb_cookie is
608 * an error. fb_cookie can be re-used after de 608 * an error. fb_cookie can be re-used after destroying the corresponding
609 * frame buffer. 609 * frame buffer.
610 * 610 *
611 * width - uint32_t, width in pixels 611 * width - uint32_t, width in pixels
612 * height - uint32_t, height in pixels 612 * height - uint32_t, height in pixels
613 * pixel_format - uint32_t, pixel format of th 613 * pixel_format - uint32_t, pixel format of the framebuffer, FOURCC code
614 */ 614 */
615 615
616 struct xendispl_fb_attach_req { 616 struct xendispl_fb_attach_req {
617 uint64_t dbuf_cookie; 617 uint64_t dbuf_cookie;
618 uint64_t fb_cookie; 618 uint64_t fb_cookie;
619 uint32_t width; 619 uint32_t width;
620 uint32_t height; 620 uint32_t height;
621 uint32_t pixel_format; 621 uint32_t pixel_format;
622 }; 622 };
623 623
624 /* 624 /*
625 * Request framebuffer detach - detach a previ 625 * Request framebuffer detach - detach a previously
626 * attached framebuffer from the display buffe 626 * attached framebuffer from the display buffer in request:
627 * 0 1 627 * 0 1 2 3 octet
628 * +----------------+----------------+-------- 628 * +----------------+----------------+----------------+----------------+
629 * | id | _OP_FB 629 * | id | _OP_FB_DETACH | reserved | 4
630 * +----------------+----------------+-------- 630 * +----------------+----------------+----------------+----------------+
631 * | reserved 631 * | reserved | 8
632 * +----------------+----------------+-------- 632 * +----------------+----------------+----------------+----------------+
633 * | fb_cookie low 32-b 633 * | fb_cookie low 32-bit | 12
634 * +----------------+----------------+-------- 634 * +----------------+----------------+----------------+----------------+
635 * | fb_cookie high 32- 635 * | fb_cookie high 32-bit | 16
636 * +----------------+----------------+-------- 636 * +----------------+----------------+----------------+----------------+
637 * | reserved 637 * | reserved | 20
638 * +----------------+----------------+-------- 638 * +----------------+----------------+----------------+----------------+
639 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 639 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
640 * +----------------+----------------+-------- 640 * +----------------+----------------+----------------+----------------+
641 * | reserved 641 * | reserved | 64
642 * +----------------+----------------+-------- 642 * +----------------+----------------+----------------+----------------+
643 * 643 *
644 * Must be sent over control ring of the conne 644 * Must be sent over control ring of the connector which has the index
645 * value of 0: 645 * value of 0:
646 * /local/domain/<dom-id>/device/vdispl/<dev 646 * /local/domain/<dom-id>/device/vdispl/<dev-id>/0/req-ring-ref
647 */ 647 */
648 648
649 struct xendispl_fb_detach_req { 649 struct xendispl_fb_detach_req {
650 uint64_t fb_cookie; 650 uint64_t fb_cookie;
651 }; 651 };
652 652
653 /* 653 /*
654 * Request configuration set/reset - request t 654 * Request configuration set/reset - request to set or reset
655 * the configuration/mode of the display: 655 * the configuration/mode of the display:
656 * 0 1 656 * 0 1 2 3 octet
657 * +----------------+----------------+-------- 657 * +----------------+----------------+----------------+----------------+
658 * | id | _OP_SET 658 * | id | _OP_SET_CONFIG | reserved | 4
659 * +----------------+----------------+-------- 659 * +----------------+----------------+----------------+----------------+
660 * | reserved 660 * | reserved | 8
661 * +----------------+----------------+-------- 661 * +----------------+----------------+----------------+----------------+
662 * | fb_cookie low 32-b 662 * | fb_cookie low 32-bit | 12
663 * +----------------+----------------+-------- 663 * +----------------+----------------+----------------+----------------+
664 * | fb_cookie high 32- 664 * | fb_cookie high 32-bit | 16
665 * +----------------+----------------+-------- 665 * +----------------+----------------+----------------+----------------+
666 * | x 666 * | x | 20
667 * +----------------+----------------+-------- 667 * +----------------+----------------+----------------+----------------+
668 * | y 668 * | y | 24
669 * +----------------+----------------+-------- 669 * +----------------+----------------+----------------+----------------+
670 * | width 670 * | width | 28
671 * +----------------+----------------+-------- 671 * +----------------+----------------+----------------+----------------+
672 * | height 672 * | height | 32
673 * +----------------+----------------+-------- 673 * +----------------+----------------+----------------+----------------+
674 * | bpp 674 * | bpp | 40
675 * +----------------+----------------+-------- 675 * +----------------+----------------+----------------+----------------+
676 * | reserved 676 * | reserved | 44
677 * +----------------+----------------+-------- 677 * +----------------+----------------+----------------+----------------+
678 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 678 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
679 * +----------------+----------------+-------- 679 * +----------------+----------------+----------------+----------------+
680 * | reserved 680 * | reserved | 64
681 * +----------------+----------------+-------- 681 * +----------------+----------------+----------------+----------------+
682 * 682 *
683 * Pass all zeros to reset, otherwise command 683 * Pass all zeros to reset, otherwise command is treated as
684 * configuration set. 684 * configuration set.
685 * Framebuffer's cookie defines which framebuf 685 * Framebuffer's cookie defines which framebuffer/dbuf must be
686 * displayed while enabling display (applying 686 * displayed while enabling display (applying configuration).
687 * x, y, width and height are bound by the con 687 * x, y, width and height are bound by the connector's resolution and must not
688 * exceed it. 688 * exceed it.
689 * 689 *
690 * x - uint32_t, starting position in pixels b 690 * x - uint32_t, starting position in pixels by X axis
691 * y - uint32_t, starting position in pixels b 691 * y - uint32_t, starting position in pixels by Y axis
692 * width - uint32_t, width in pixels 692 * width - uint32_t, width in pixels
693 * height - uint32_t, height in pixels 693 * height - uint32_t, height in pixels
694 * bpp - uint32_t, bits per pixel 694 * bpp - uint32_t, bits per pixel
695 */ 695 */
696 696
697 struct xendispl_set_config_req { 697 struct xendispl_set_config_req {
698 uint64_t fb_cookie; 698 uint64_t fb_cookie;
699 uint32_t x; 699 uint32_t x;
700 uint32_t y; 700 uint32_t y;
701 uint32_t width; 701 uint32_t width;
702 uint32_t height; 702 uint32_t height;
703 uint32_t bpp; 703 uint32_t bpp;
704 }; 704 };
705 705
706 /* 706 /*
707 * Request page flip - request to flip a page 707 * Request page flip - request to flip a page identified by the framebuffer
708 * cookie: 708 * cookie:
709 * 0 1 709 * 0 1 2 3 octet
710 * +----------------+----------------+-------- 710 * +----------------+----------------+----------------+----------------+
711 * | id | _OP_PG_ 711 * | id | _OP_PG_FLIP | reserved | 4
712 * +----------------+----------------+-------- 712 * +----------------+----------------+----------------+----------------+
713 * | reserved 713 * | reserved | 8
714 * +----------------+----------------+-------- 714 * +----------------+----------------+----------------+----------------+
715 * | fb_cookie low 32-b 715 * | fb_cookie low 32-bit | 12
716 * +----------------+----------------+-------- 716 * +----------------+----------------+----------------+----------------+
717 * | fb_cookie high 32- 717 * | fb_cookie high 32-bit | 16
718 * +----------------+----------------+-------- 718 * +----------------+----------------+----------------+----------------+
719 * | reserved 719 * | reserved | 20
720 * +----------------+----------------+-------- 720 * +----------------+----------------+----------------+----------------+
721 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 721 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
722 * +----------------+----------------+-------- 722 * +----------------+----------------+----------------+----------------+
723 * | reserved 723 * | reserved | 64
724 * +----------------+----------------+-------- 724 * +----------------+----------------+----------------+----------------+
725 */ 725 */
726 726
727 struct xendispl_page_flip_req { 727 struct xendispl_page_flip_req {
728 uint64_t fb_cookie; 728 uint64_t fb_cookie;
729 }; 729 };
730 730
731 /* 731 /*
732 * Request EDID - request EDID describing curr 732 * Request EDID - request EDID describing current connector:
733 * 0 1 733 * 0 1 2 3 octet
734 * +----------------+----------------+-------- 734 * +----------------+----------------+----------------+----------------+
735 * | id | _OP_GET 735 * | id | _OP_GET_EDID | reserved | 4
736 * +----------------+----------------+-------- 736 * +----------------+----------------+----------------+----------------+
737 * | buffer_sz 737 * | buffer_sz | 8
738 * +----------------+----------------+-------- 738 * +----------------+----------------+----------------+----------------+
739 * | gref_directory 739 * | gref_directory | 12
740 * +----------------+----------------+-------- 740 * +----------------+----------------+----------------+----------------+
741 * | reserved 741 * | reserved | 16
742 * +----------------+----------------+-------- 742 * +----------------+----------------+----------------+----------------+
743 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 743 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
744 * +----------------+----------------+-------- 744 * +----------------+----------------+----------------+----------------+
745 * | reserved 745 * | reserved | 64
746 * +----------------+----------------+-------- 746 * +----------------+----------------+----------------+----------------+
747 * 747 *
748 * Notes: 748 * Notes:
749 * - This command is not available in protoc 749 * - This command is not available in protocol version 1 and should be
750 * ignored. 750 * ignored.
751 * - This request is optional and if not sup 751 * - This request is optional and if not supported then visible area
752 * is defined by the relevant XenStore's " 752 * is defined by the relevant XenStore's "resolution" property.
753 * - Shared buffer, allocated for EDID stora 753 * - Shared buffer, allocated for EDID storage, must not be less then
754 * XENDISPL_EDID_MAX_SIZE octets. 754 * XENDISPL_EDID_MAX_SIZE octets.
755 * 755 *
756 * buffer_sz - uint32_t, buffer size to be all 756 * buffer_sz - uint32_t, buffer size to be allocated, octets
757 * gref_directory - grant_ref_t, a reference t 757 * gref_directory - grant_ref_t, a reference to the first shared page
758 * describing EDID buffer references. See XE 758 * describing EDID buffer references. See XENDISPL_OP_DBUF_CREATE for
759 * grant page directory structure (struct xe 759 * grant page directory structure (struct xendispl_page_directory).
760 * 760 *
761 * See response format for this request. 761 * See response format for this request.
762 */ 762 */
763 763
764 struct xendispl_get_edid_req { 764 struct xendispl_get_edid_req {
765 uint32_t buffer_sz; 765 uint32_t buffer_sz;
766 grant_ref_t gref_directory; 766 grant_ref_t gref_directory;
767 }; 767 };
768 768
769 /* 769 /*
770 *---------------------------------- Responses 770 *---------------------------------- Responses --------------------------------
771 * 771 *
772 * All response packets have the same length ( 772 * All response packets have the same length (64 octets)
773 * 773 *
774 * All response packets have common header: 774 * All response packets have common header:
775 * 0 1 775 * 0 1 2 3 octet
776 * +----------------+----------------+-------- 776 * +----------------+----------------+----------------+----------------+
777 * | id | 777 * | id | reserved | 4
778 * +----------------+----------------+-------- 778 * +----------------+----------------+----------------+----------------+
779 * | status 779 * | status | 8
780 * +----------------+----------------+-------- 780 * +----------------+----------------+----------------+----------------+
781 * | reserved 781 * | reserved | 12
782 * +----------------+----------------+-------- 782 * +----------------+----------------+----------------+----------------+
783 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 783 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
784 * +----------------+----------------+-------- 784 * +----------------+----------------+----------------+----------------+
785 * | reserved 785 * | reserved | 64
786 * +----------------+----------------+-------- 786 * +----------------+----------------+----------------+----------------+
787 * 787 *
788 * id - uint16_t, private guest value, echoed 788 * id - uint16_t, private guest value, echoed from request
789 * status - int32_t, response status, zero on 789 * status - int32_t, response status, zero on success and -XEN_EXX on failure
790 * 790 *
791 * 791 *
792 * Get EDID response - response for XENDISPL_O 792 * Get EDID response - response for XENDISPL_OP_GET_EDID:
793 * 0 1 793 * 0 1 2 3 octet
794 * +----------------+----------------+-------- 794 * +----------------+----------------+----------------+----------------+
795 * | id | oper 795 * | id | operation | reserved | 4
796 * +----------------+----------------+-------- 796 * +----------------+----------------+----------------+----------------+
797 * | status 797 * | status | 8
798 * +----------------+----------------+-------- 798 * +----------------+----------------+----------------+----------------+
799 * | edid_sz 799 * | edid_sz | 12
800 * +----------------+----------------+-------- 800 * +----------------+----------------+----------------+----------------+
801 * | reserved 801 * | reserved | 16
802 * +----------------+----------------+-------- 802 * +----------------+----------------+----------------+----------------+
803 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 803 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
804 * +----------------+----------------+-------- 804 * +----------------+----------------+----------------+----------------+
805 * | reserved 805 * | reserved | 64
806 * +----------------+----------------+-------- 806 * +----------------+----------------+----------------+----------------+
807 * 807 *
808 * Notes: 808 * Notes:
809 * - This response is not available in proto 809 * - This response is not available in protocol version 1 and should be
810 * ignored. 810 * ignored.
811 * 811 *
812 * edid_sz - uint32_t, size of the EDID, octet 812 * edid_sz - uint32_t, size of the EDID, octets
813 */ 813 */
814 814
815 struct xendispl_get_edid_resp { 815 struct xendispl_get_edid_resp {
816 uint32_t edid_sz; 816 uint32_t edid_sz;
817 }; 817 };
818 818
819 /* 819 /*
820 *----------------------------------- Events - 820 *----------------------------------- Events ----------------------------------
821 * 821 *
822 * Events are sent via a shared page allocated 822 * Events are sent via a shared page allocated by the front and propagated by
823 * evt-event-channel/evt-ring-ref XenStore e 823 * evt-event-channel/evt-ring-ref XenStore entries
824 * All event packets have the same length (64 824 * All event packets have the same length (64 octets)
825 * All event packets have common header: 825 * All event packets have common header:
826 * 0 1 826 * 0 1 2 3 octet
827 * +----------------+----------------+-------- 827 * +----------------+----------------+----------------+----------------+
828 * | id | ty 828 * | id | type | reserved | 4
829 * +----------------+----------------+-------- 829 * +----------------+----------------+----------------+----------------+
830 * | reserved 830 * | reserved | 8
831 * +----------------+----------------+-------- 831 * +----------------+----------------+----------------+----------------+
832 * 832 *
833 * id - uint16_t, event id, may be used by fro 833 * id - uint16_t, event id, may be used by front
834 * type - uint8_t, type of the event 834 * type - uint8_t, type of the event
835 * 835 *
836 * 836 *
837 * Page flip complete event - event from back 837 * Page flip complete event - event from back to front on page flip completed:
838 * 0 1 838 * 0 1 2 3 octet
839 * +----------------+----------------+-------- 839 * +----------------+----------------+----------------+----------------+
840 * | id | _EVT_ 840 * | id | _EVT_PG_FLIP | reserved | 4
841 * +----------------+----------------+-------- 841 * +----------------+----------------+----------------+----------------+
842 * | reserved 842 * | reserved | 8
843 * +----------------+----------------+-------- 843 * +----------------+----------------+----------------+----------------+
844 * | fb_cookie low 32-b 844 * | fb_cookie low 32-bit | 12
845 * +----------------+----------------+-------- 845 * +----------------+----------------+----------------+----------------+
846 * | fb_cookie high 32- 846 * | fb_cookie high 32-bit | 16
847 * +----------------+----------------+-------- 847 * +----------------+----------------+----------------+----------------+
848 * | reserved 848 * | reserved | 20
849 * +----------------+----------------+-------- 849 * +----------------+----------------+----------------+----------------+
850 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 850 * |/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/|
851 * +----------------+----------------+-------- 851 * +----------------+----------------+----------------+----------------+
852 * | reserved 852 * | reserved | 64
853 * +----------------+----------------+-------- 853 * +----------------+----------------+----------------+----------------+
854 */ 854 */
855 855
856 struct xendispl_pg_flip_evt { 856 struct xendispl_pg_flip_evt {
857 uint64_t fb_cookie; 857 uint64_t fb_cookie;
858 }; 858 };
859 859
860 struct xendispl_req { 860 struct xendispl_req {
861 uint16_t id; 861 uint16_t id;
862 uint8_t operation; 862 uint8_t operation;
863 uint8_t reserved[5]; 863 uint8_t reserved[5];
864 union { 864 union {
865 struct xendispl_dbuf_create_re 865 struct xendispl_dbuf_create_req dbuf_create;
866 struct xendispl_dbuf_destroy_r 866 struct xendispl_dbuf_destroy_req dbuf_destroy;
867 struct xendispl_fb_attach_req 867 struct xendispl_fb_attach_req fb_attach;
868 struct xendispl_fb_detach_req 868 struct xendispl_fb_detach_req fb_detach;
869 struct xendispl_set_config_req 869 struct xendispl_set_config_req set_config;
870 struct xendispl_page_flip_req 870 struct xendispl_page_flip_req pg_flip;
871 struct xendispl_get_edid_req g 871 struct xendispl_get_edid_req get_edid;
872 uint8_t reserved[56]; 872 uint8_t reserved[56];
873 } op; 873 } op;
874 }; 874 };
875 875
876 struct xendispl_resp { 876 struct xendispl_resp {
877 uint16_t id; 877 uint16_t id;
878 uint8_t operation; 878 uint8_t operation;
879 uint8_t reserved; 879 uint8_t reserved;
880 int32_t status; 880 int32_t status;
881 union { 881 union {
882 struct xendispl_get_edid_resp 882 struct xendispl_get_edid_resp get_edid;
883 uint8_t reserved1[56]; 883 uint8_t reserved1[56];
884 } op; 884 } op;
885 }; 885 };
886 886
887 struct xendispl_evt { 887 struct xendispl_evt {
888 uint16_t id; 888 uint16_t id;
889 uint8_t type; 889 uint8_t type;
890 uint8_t reserved[5]; 890 uint8_t reserved[5];
891 union { 891 union {
892 struct xendispl_pg_flip_evt pg 892 struct xendispl_pg_flip_evt pg_flip;
893 uint8_t reserved[56]; 893 uint8_t reserved[56];
894 } op; 894 } op;
895 }; 895 };
896 896
897 DEFINE_RING_TYPES(xen_displif, struct xendispl 897 DEFINE_RING_TYPES(xen_displif, struct xendispl_req, struct xendispl_resp);
898 898
899 /* 899 /*
900 ********************************************* 900 ******************************************************************************
901 * Back to front events 901 * Back to front events delivery
902 ********************************************* 902 ******************************************************************************
903 * In order to deliver asynchronous events fro 903 * In order to deliver asynchronous events from back to front a shared page is
904 * allocated by front and its granted referenc 904 * allocated by front and its granted reference propagated to back via
905 * XenStore entries (evt-ring-ref/evt-event-ch 905 * XenStore entries (evt-ring-ref/evt-event-channel).
906 * This page has a common header used by both 906 * This page has a common header used by both front and back to synchronize
907 * access and control event's ring buffer, whi 907 * access and control event's ring buffer, while back being a producer of the
908 * events and front being a consumer. The rest 908 * events and front being a consumer. The rest of the page after the header
909 * is used for event packets. 909 * is used for event packets.
910 * 910 *
911 * Upon reception of an event(s) front may con 911 * Upon reception of an event(s) front may confirm its reception
912 * for either each event, group of events or n 912 * for either each event, group of events or none.
913 */ 913 */
914 914
915 struct xendispl_event_page { 915 struct xendispl_event_page {
916 uint32_t in_cons; 916 uint32_t in_cons;
917 uint32_t in_prod; 917 uint32_t in_prod;
918 uint8_t reserved[56]; 918 uint8_t reserved[56];
919 }; 919 };
920 920
921 #define XENDISPL_EVENT_PAGE_SIZE XEN_PAGE_SIZE 921 #define XENDISPL_EVENT_PAGE_SIZE XEN_PAGE_SIZE
922 #define XENDISPL_IN_RING_OFFS (sizeof(struct x 922 #define XENDISPL_IN_RING_OFFS (sizeof(struct xendispl_event_page))
923 #define XENDISPL_IN_RING_SIZE (XENDISPL_EVENT_ 923 #define XENDISPL_IN_RING_SIZE (XENDISPL_EVENT_PAGE_SIZE - XENDISPL_IN_RING_OFFS)
924 #define XENDISPL_IN_RING_LEN (XENDISPL_IN_RING 924 #define XENDISPL_IN_RING_LEN (XENDISPL_IN_RING_SIZE / sizeof(struct xendispl_evt))
925 #define XENDISPL_IN_RING(page) \ 925 #define XENDISPL_IN_RING(page) \
926 ((struct xendispl_evt *)((char *)(page 926 ((struct xendispl_evt *)((char *)(page) + XENDISPL_IN_RING_OFFS))
927 #define XENDISPL_IN_RING_REF(page, idx) \ 927 #define XENDISPL_IN_RING_REF(page, idx) \
928 (XENDISPL_IN_RING((page))[(idx) % XEND 928 (XENDISPL_IN_RING((page))[(idx) % XENDISPL_IN_RING_LEN])
929 929
930 #endif /* __XEN_PUBLIC_IO_DISPLIF_H__ */ 930 #endif /* __XEN_PUBLIC_IO_DISPLIF_H__ */
931 931
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