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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2021 Microsoft
4 *
5 * Portions of this code is derived from hyperv_fb.c
6 */
7
8#include <linux/hyperv.h>
9
10#include <drm/drm_print.h>
11#include <drm/drm_simple_kms_helper.h>
12
13#include "hyperv_drm.h"
14
15#define VMBUS_RING_BUFSIZE (256 * 1024)
16#define VMBUS_VSP_TIMEOUT (10 * HZ)
17
18#define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
19#define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff)
20#define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16)
21#define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
22#define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
23#define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5)
24
25#define SYNTHVID_DEPTH_WIN7 16
26#define SYNTHVID_DEPTH_WIN8 32
27#define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024)
28#define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
29#define SYNTHVID_WIDTH_MAX_WIN7 1600
30#define SYNTHVID_HEIGHT_MAX_WIN7 1200
31
32enum pipe_msg_type {
33 PIPE_MSG_INVALID,
34 PIPE_MSG_DATA,
35 PIPE_MSG_MAX
36};
37
38enum synthvid_msg_type {
39 SYNTHVID_ERROR = 0,
40 SYNTHVID_VERSION_REQUEST = 1,
41 SYNTHVID_VERSION_RESPONSE = 2,
42 SYNTHVID_VRAM_LOCATION = 3,
43 SYNTHVID_VRAM_LOCATION_ACK = 4,
44 SYNTHVID_SITUATION_UPDATE = 5,
45 SYNTHVID_SITUATION_UPDATE_ACK = 6,
46 SYNTHVID_POINTER_POSITION = 7,
47 SYNTHVID_POINTER_SHAPE = 8,
48 SYNTHVID_FEATURE_CHANGE = 9,
49 SYNTHVID_DIRT = 10,
50 SYNTHVID_RESOLUTION_REQUEST = 13,
51 SYNTHVID_RESOLUTION_RESPONSE = 14,
52
53 SYNTHVID_MAX = 15
54};
55
56struct pipe_msg_hdr {
57 u32 type;
58 u32 size; /* size of message after this field */
59} __packed;
60
61struct hvd_screen_info {
62 u16 width;
63 u16 height;
64} __packed;
65
66struct synthvid_msg_hdr {
67 u32 type;
68 u32 size; /* size of this header + payload after this field */
69} __packed;
70
71struct synthvid_version_req {
72 u32 version;
73} __packed;
74
75struct synthvid_version_resp {
76 u32 version;
77 u8 is_accepted;
78 u8 max_video_outputs;
79} __packed;
80
81struct synthvid_vram_location {
82 u64 user_ctx;
83 u8 is_vram_gpa_specified;
84 u64 vram_gpa;
85} __packed;
86
87struct synthvid_vram_location_ack {
88 u64 user_ctx;
89} __packed;
90
91struct video_output_situation {
92 u8 active;
93 u32 vram_offset;
94 u8 depth_bits;
95 u32 width_pixels;
96 u32 height_pixels;
97 u32 pitch_bytes;
98} __packed;
99
100struct synthvid_situation_update {
101 u64 user_ctx;
102 u8 video_output_count;
103 struct video_output_situation video_output[1];
104} __packed;
105
106struct synthvid_situation_update_ack {
107 u64 user_ctx;
108} __packed;
109
110struct synthvid_pointer_position {
111 u8 is_visible;
112 u8 video_output;
113 s32 image_x;
114 s32 image_y;
115} __packed;
116
117#define SYNTHVID_CURSOR_MAX_X 96
118#define SYNTHVID_CURSOR_MAX_Y 96
119#define SYNTHVID_CURSOR_ARGB_PIXEL_SIZE 4
120#define SYNTHVID_CURSOR_MAX_SIZE (SYNTHVID_CURSOR_MAX_X * \
121 SYNTHVID_CURSOR_MAX_Y * SYNTHVID_CURSOR_ARGB_PIXEL_SIZE)
122#define SYNTHVID_CURSOR_COMPLETE (-1)
123
124struct synthvid_pointer_shape {
125 u8 part_idx;
126 u8 is_argb;
127 u32 width; /* SYNTHVID_CURSOR_MAX_X at most */
128 u32 height; /* SYNTHVID_CURSOR_MAX_Y at most */
129 u32 hot_x; /* hotspot relative to upper-left of pointer image */
130 u32 hot_y;
131 u8 data[4];
132} __packed;
133
134struct synthvid_feature_change {
135 u8 is_dirt_needed;
136 u8 is_ptr_pos_needed;
137 u8 is_ptr_shape_needed;
138 u8 is_situ_needed;
139} __packed;
140
141struct rect {
142 s32 x1, y1; /* top left corner */
143 s32 x2, y2; /* bottom right corner, exclusive */
144} __packed;
145
146struct synthvid_dirt {
147 u8 video_output;
148 u8 dirt_count;
149 struct rect rect[1];
150} __packed;
151
152#define SYNTHVID_EDID_BLOCK_SIZE 128
153#define SYNTHVID_MAX_RESOLUTION_COUNT 64
154
155struct synthvid_supported_resolution_req {
156 u8 maximum_resolution_count;
157} __packed;
158
159struct synthvid_supported_resolution_resp {
160 u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE];
161 u8 resolution_count;
162 u8 default_resolution_index;
163 u8 is_standard;
164 struct hvd_screen_info supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT];
165} __packed;
166
167struct synthvid_msg {
168 struct pipe_msg_hdr pipe_hdr;
169 struct synthvid_msg_hdr vid_hdr;
170 union {
171 struct synthvid_version_req ver_req;
172 struct synthvid_version_resp ver_resp;
173 struct synthvid_vram_location vram;
174 struct synthvid_vram_location_ack vram_ack;
175 struct synthvid_situation_update situ;
176 struct synthvid_situation_update_ack situ_ack;
177 struct synthvid_pointer_position ptr_pos;
178 struct synthvid_pointer_shape ptr_shape;
179 struct synthvid_feature_change feature_chg;
180 struct synthvid_dirt dirt;
181 struct synthvid_supported_resolution_req resolution_req;
182 struct synthvid_supported_resolution_resp resolution_resp;
183 };
184} __packed;
185
186static inline bool hyperv_version_ge(u32 ver1, u32 ver2)
187{
188 if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) ||
189 (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) &&
190 SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2)))
191 return true;
192
193 return false;
194}
195
196static inline int hyperv_sendpacket(struct hv_device *hdev, struct synthvid_msg *msg)
197{
198 static atomic64_t request_id = ATOMIC64_INIT(0);
199 struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
200 int ret;
201
202 msg->pipe_hdr.type = PIPE_MSG_DATA;
203 msg->pipe_hdr.size = msg->vid_hdr.size;
204
205 ret = vmbus_sendpacket(hdev->channel, msg,
206 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr),
207 atomic64_inc_return(&request_id),
208 VM_PKT_DATA_INBAND, 0);
209
210 if (ret)
211 drm_err(&hv->dev, "Unable to send packet via vmbus\n");
212
213 return ret;
214}
215
216static int hyperv_negotiate_version(struct hv_device *hdev, u32 ver)
217{
218 struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
219 struct synthvid_msg *msg = (struct synthvid_msg *)hv->init_buf;
220 struct drm_device *dev = &hv->dev;
221 unsigned long t;
222
223 memset(msg, 0, sizeof(struct synthvid_msg));
224 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
225 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
226 sizeof(struct synthvid_version_req);
227 msg->ver_req.version = ver;
228 hyperv_sendpacket(hdev, msg);
229
230 t = wait_for_completion_timeout(&hv->wait, VMBUS_VSP_TIMEOUT);
231 if (!t) {
232 drm_err(dev, "Time out on waiting version response\n");
233 return -ETIMEDOUT;
234 }
235
236 if (!msg->ver_resp.is_accepted) {
237 drm_err(dev, "Version request not accepted\n");
238 return -ENODEV;
239 }
240
241 hv->synthvid_version = ver;
242 drm_info(dev, "Synthvid Version major %d, minor %d\n",
243 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver));
244
245 return 0;
246}
247
248int hyperv_update_vram_location(struct hv_device *hdev, phys_addr_t vram_pp)
249{
250 struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
251 struct synthvid_msg *msg = (struct synthvid_msg *)hv->init_buf;
252 struct drm_device *dev = &hv->dev;
253 unsigned long t;
254
255 memset(msg, 0, sizeof(struct synthvid_msg));
256 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
257 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
258 sizeof(struct synthvid_vram_location);
259 msg->vram.user_ctx = vram_pp;
260 msg->vram.vram_gpa = vram_pp;
261 msg->vram.is_vram_gpa_specified = 1;
262 hyperv_sendpacket(hdev, msg);
263
264 t = wait_for_completion_timeout(&hv->wait, VMBUS_VSP_TIMEOUT);
265 if (!t) {
266 drm_err(dev, "Time out on waiting vram location ack\n");
267 return -ETIMEDOUT;
268 }
269 if (msg->vram_ack.user_ctx != vram_pp) {
270 drm_err(dev, "Unable to set VRAM location\n");
271 return -ENODEV;
272 }
273
274 return 0;
275}
276
277int hyperv_update_situation(struct hv_device *hdev, u8 active, u32 bpp,
278 u32 w, u32 h, u32 pitch)
279{
280 struct synthvid_msg msg;
281
282 memset(&msg, 0, sizeof(struct synthvid_msg));
283
284 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
285 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
286 sizeof(struct synthvid_situation_update);
287 msg.situ.user_ctx = 0;
288 msg.situ.video_output_count = 1;
289 msg.situ.video_output[0].active = active;
290 /* vram_offset should always be 0 */
291 msg.situ.video_output[0].vram_offset = 0;
292 msg.situ.video_output[0].depth_bits = bpp;
293 msg.situ.video_output[0].width_pixels = w;
294 msg.situ.video_output[0].height_pixels = h;
295 msg.situ.video_output[0].pitch_bytes = pitch;
296
297 hyperv_sendpacket(hdev, &msg);
298
299 return 0;
300}
301
302int hyperv_update_dirt(struct hv_device *hdev, struct drm_rect *rect)
303{
304 struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
305 struct synthvid_msg msg;
306
307 if (!hv->dirt_needed)
308 return 0;
309
310 memset(&msg, 0, sizeof(struct synthvid_msg));
311
312 msg.vid_hdr.type = SYNTHVID_DIRT;
313 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
314 sizeof(struct synthvid_dirt);
315 msg.dirt.video_output = 0;
316 msg.dirt.dirt_count = 1;
317 msg.dirt.rect[0].x1 = rect->x1;
318 msg.dirt.rect[0].y1 = rect->y1;
319 msg.dirt.rect[0].x2 = rect->x2;
320 msg.dirt.rect[0].y2 = rect->y2;
321
322 hyperv_sendpacket(hdev, &msg);
323
324 return 0;
325}
326
327static int hyperv_get_supported_resolution(struct hv_device *hdev)
328{
329 struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
330 struct synthvid_msg *msg = (struct synthvid_msg *)hv->init_buf;
331 struct drm_device *dev = &hv->dev;
332 unsigned long t;
333 u8 index;
334 int i;
335
336 memset(msg, 0, sizeof(struct synthvid_msg));
337 msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST;
338 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
339 sizeof(struct synthvid_supported_resolution_req);
340 msg->resolution_req.maximum_resolution_count =
341 SYNTHVID_MAX_RESOLUTION_COUNT;
342 hyperv_sendpacket(hdev, msg);
343
344 t = wait_for_completion_timeout(&hv->wait, VMBUS_VSP_TIMEOUT);
345 if (!t) {
346 drm_err(dev, "Time out on waiting resolution response\n");
347 return -ETIMEDOUT;
348 }
349
350 if (msg->resolution_resp.resolution_count == 0) {
351 drm_err(dev, "No supported resolutions\n");
352 return -ENODEV;
353 }
354
355 index = msg->resolution_resp.default_resolution_index;
356 if (index >= msg->resolution_resp.resolution_count) {
357 drm_err(dev, "Invalid resolution index: %d\n", index);
358 return -ENODEV;
359 }
360
361 for (i = 0; i < msg->resolution_resp.resolution_count; i++) {
362 hv->screen_width_max = max_t(u32, hv->screen_width_max,
363 msg->resolution_resp.supported_resolution[i].width);
364 hv->screen_height_max = max_t(u32, hv->screen_height_max,
365 msg->resolution_resp.supported_resolution[i].height);
366 }
367
368 hv->preferred_width =
369 msg->resolution_resp.supported_resolution[index].width;
370 hv->preferred_height =
371 msg->resolution_resp.supported_resolution[index].height;
372
373 return 0;
374}
375
376static void hyperv_receive_sub(struct hv_device *hdev)
377{
378 struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
379 struct synthvid_msg *msg;
380
381 if (!hv)
382 return;
383
384 msg = (struct synthvid_msg *)hv->recv_buf;
385
386 /* Complete the wait event */
387 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
388 msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE ||
389 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
390 memcpy(hv->init_buf, msg, VMBUS_MAX_PACKET_SIZE);
391 complete(&hv->wait);
392 return;
393 }
394
395 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE)
396 hv->dirt_needed = msg->feature_chg.is_dirt_needed;
397}
398
399static void hyperv_receive(void *ctx)
400{
401 struct hv_device *hdev = ctx;
402 struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
403 struct synthvid_msg *recv_buf;
404 u32 bytes_recvd;
405 u64 req_id;
406 int ret;
407
408 if (!hv)
409 return;
410
411 recv_buf = (struct synthvid_msg *)hv->recv_buf;
412
413 do {
414 ret = vmbus_recvpacket(hdev->channel, recv_buf,
415 VMBUS_MAX_PACKET_SIZE,
416 &bytes_recvd, &req_id);
417 if (bytes_recvd > 0 &&
418 recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
419 hyperv_receive_sub(hdev);
420 } while (bytes_recvd > 0 && ret == 0);
421}
422
423int hyperv_connect_vsp(struct hv_device *hdev)
424{
425 struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
426 struct drm_device *dev = &hv->dev;
427 int ret;
428
429 ret = vmbus_open(hdev->channel, VMBUS_RING_BUFSIZE, VMBUS_RING_BUFSIZE,
430 NULL, 0, hyperv_receive, hdev);
431 if (ret) {
432 drm_err(dev, "Unable to open vmbus channel\n");
433 return ret;
434 }
435
436 /* Negotiate the protocol version with host */
437 switch (vmbus_proto_version) {
438 case VERSION_WIN10:
439 case VERSION_WIN10_V5:
440 ret = hyperv_negotiate_version(hdev, SYNTHVID_VERSION_WIN10);
441 if (!ret)
442 break;
443 fallthrough;
444 case VERSION_WIN8:
445 case VERSION_WIN8_1:
446 ret = hyperv_negotiate_version(hdev, SYNTHVID_VERSION_WIN8);
447 if (!ret)
448 break;
449 fallthrough;
450 case VERSION_WS2008:
451 case VERSION_WIN7:
452 ret = hyperv_negotiate_version(hdev, SYNTHVID_VERSION_WIN7);
453 break;
454 default:
455 ret = hyperv_negotiate_version(hdev, SYNTHVID_VERSION_WIN10);
456 break;
457 }
458
459 if (ret) {
460 drm_err(dev, "Synthetic video device version not accepted %d\n", ret);
461 goto error;
462 }
463
464 if (hv->synthvid_version == SYNTHVID_VERSION_WIN7)
465 hv->screen_depth = SYNTHVID_DEPTH_WIN7;
466 else
467 hv->screen_depth = SYNTHVID_DEPTH_WIN8;
468
469 if (hyperv_version_ge(hv->synthvid_version, SYNTHVID_VERSION_WIN10)) {
470 ret = hyperv_get_supported_resolution(hdev);
471 if (ret)
472 drm_err(dev, "Failed to get supported resolution from host, use default\n");
473 } else {
474 hv->screen_width_max = SYNTHVID_WIDTH_MAX_WIN7;
475 hv->screen_height_max = SYNTHVID_HEIGHT_MAX_WIN7;
476 }
477
478 hv->mmio_megabytes = hdev->channel->offermsg.offer.mmio_megabytes;
479
480 return 0;
481
482error:
483 vmbus_close(hdev->channel);
484 return ret;
485}