1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2012, Microsoft Corporation.
4 *
5 * Author:
6 * Haiyang Zhang <haiyangz@microsoft.com>
7 */
8
9 /*
10 * Hyper-V Synthetic Video Frame Buffer Driver
11 *
12 * This is the driver for the Hyper-V Synthetic Video, which supports
13 * screen resolution up to Full HD 1920x1080 with 32 bit color on Windows
14 * Server 2012, and 1600x1200 with 16 bit color on Windows Server 2008 R2
15 * or earlier.
16 *
17 * It also solves the double mouse cursor issue of the emulated video mode.
18 *
19 * The default screen resolution is 1152x864, which may be changed by a
20 * kernel parameter:
21 * video=hyperv_fb:<width>x<height>
22 * For example: video=hyperv_fb:1280x1024
23 *
24 * Portrait orientation is also supported:
25 * For example: video=hyperv_fb:864x1152
26 *
27 * When a Windows 10 RS5+ host is used, the virtual machine screen
28 * resolution is obtained from the host. The "video=hyperv_fb" option is
29 * not needed, but still can be used to overwrite what the host specifies.
30 * The VM resolution on the host could be set by executing the powershell
31 * "set-vmvideo" command. For example
32 * set-vmvideo -vmname name -horizontalresolution:1920 \
33 * -verticalresolution:1200 -resolutiontype single
34 *
35 * Gen 1 VMs also support direct using VM's physical memory for framebuffer.
36 * It could improve the efficiency and performance for framebuffer and VM.
37 * This requires to allocate contiguous physical memory from Linux kernel's
38 * CMA memory allocator. To enable this, supply a kernel parameter to give
39 * enough memory space to CMA allocator for framebuffer. For example:
40 * cma=130m
41 * This gives 130MB memory to CMA allocator that can be allocated to
42 * framebuffer. For reference, 8K resolution (7680x4320) takes about
43 * 127MB memory.
44 */
45
46 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
47
48 #include <linux/aperture.h>
49 #include <linux/module.h>
50 #include <linux/kernel.h>
51 #include <linux/vmalloc.h>
52 #include <linux/init.h>
53 #include <linux/completion.h>
54 #include <linux/fb.h>
55 #include <linux/pci.h>
56 #include <linux/panic_notifier.h>
57 #include <linux/efi.h>
58 #include <linux/console.h>
59
60 #include <linux/hyperv.h>
61
62
63 /* Hyper-V Synthetic Video Protocol definitions and structures */
64 #define MAX_VMBUS_PKT_SIZE 0x4000
65
66 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
67 /* Support for VERSION_WIN7 is removed. #define is retained for reference. */
68 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
69 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
70 #define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5)
71
72 #define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff)
73 #define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16)
74
75 #define SYNTHVID_DEPTH_WIN8 32
76 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
77
78 enum pipe_msg_type {
79 PIPE_MSG_INVALID,
80 PIPE_MSG_DATA,
81 PIPE_MSG_MAX
82 };
83
84 struct pipe_msg_hdr {
85 u32 type;
86 u32 size; /* size of message after this field */
87 } __packed;
88
89
90 enum synthvid_msg_type {
91 SYNTHVID_ERROR = 0,
92 SYNTHVID_VERSION_REQUEST = 1,
93 SYNTHVID_VERSION_RESPONSE = 2,
94 SYNTHVID_VRAM_LOCATION = 3,
95 SYNTHVID_VRAM_LOCATION_ACK = 4,
96 SYNTHVID_SITUATION_UPDATE = 5,
97 SYNTHVID_SITUATION_UPDATE_ACK = 6,
98 SYNTHVID_POINTER_POSITION = 7,
99 SYNTHVID_POINTER_SHAPE = 8,
100 SYNTHVID_FEATURE_CHANGE = 9,
101 SYNTHVID_DIRT = 10,
102 SYNTHVID_RESOLUTION_REQUEST = 13,
103 SYNTHVID_RESOLUTION_RESPONSE = 14,
104
105 SYNTHVID_MAX = 15
106 };
107
108 #define SYNTHVID_EDID_BLOCK_SIZE 128
109 #define SYNTHVID_MAX_RESOLUTION_COUNT 64
110
111 struct hvd_screen_info {
112 u16 width;
113 u16 height;
114 } __packed;
115
116 struct synthvid_msg_hdr {
117 u32 type;
118 u32 size; /* size of this header + payload after this field*/
119 } __packed;
120
121 struct synthvid_version_req {
122 u32 version;
123 } __packed;
124
125 struct synthvid_version_resp {
126 u32 version;
127 u8 is_accepted;
128 u8 max_video_outputs;
129 } __packed;
130
131 struct synthvid_supported_resolution_req {
132 u8 maximum_resolution_count;
133 } __packed;
134
135 struct synthvid_supported_resolution_resp {
136 u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE];
137 u8 resolution_count;
138 u8 default_resolution_index;
139 u8 is_standard;
140 struct hvd_screen_info
141 supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT];
142 } __packed;
143
144 struct synthvid_vram_location {
145 u64 user_ctx;
146 u8 is_vram_gpa_specified;
147 u64 vram_gpa;
148 } __packed;
149
150 struct synthvid_vram_location_ack {
151 u64 user_ctx;
152 } __packed;
153
154 struct video_output_situation {
155 u8 active;
156 u32 vram_offset;
157 u8 depth_bits;
158 u32 width_pixels;
159 u32 height_pixels;
160 u32 pitch_bytes;
161 } __packed;
162
163 struct synthvid_situation_update {
164 u64 user_ctx;
165 u8 video_output_count;
166 struct video_output_situation video_output[1];
167 } __packed;
168
169 struct synthvid_situation_update_ack {
170 u64 user_ctx;
171 } __packed;
172
173 struct synthvid_pointer_position {
174 u8 is_visible;
175 u8 video_output;
176 s32 image_x;
177 s32 image_y;
178 } __packed;
179
180
181 #define CURSOR_MAX_X 96
182 #define CURSOR_MAX_Y 96
183 #define CURSOR_ARGB_PIXEL_SIZE 4
184 #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE)
185 #define CURSOR_COMPLETE (-1)
186
187 struct synthvid_pointer_shape {
188 u8 part_idx;
189 u8 is_argb;
190 u32 width; /* CURSOR_MAX_X at most */
191 u32 height; /* CURSOR_MAX_Y at most */
192 u32 hot_x; /* hotspot relative to upper-left of pointer image */
193 u32 hot_y;
194 u8 data[4];
195 } __packed;
196
197 struct synthvid_feature_change {
198 u8 is_dirt_needed;
199 u8 is_ptr_pos_needed;
200 u8 is_ptr_shape_needed;
201 u8 is_situ_needed;
202 } __packed;
203
204 struct rect {
205 s32 x1, y1; /* top left corner */
206 s32 x2, y2; /* bottom right corner, exclusive */
207 } __packed;
208
209 struct synthvid_dirt {
210 u8 video_output;
211 u8 dirt_count;
212 struct rect rect[1];
213 } __packed;
214
215 struct synthvid_msg {
216 struct pipe_msg_hdr pipe_hdr;
217 struct synthvid_msg_hdr vid_hdr;
218 union {
219 struct synthvid_version_req ver_req;
220 struct synthvid_version_resp ver_resp;
221 struct synthvid_vram_location vram;
222 struct synthvid_vram_location_ack vram_ack;
223 struct synthvid_situation_update situ;
224 struct synthvid_situation_update_ack situ_ack;
225 struct synthvid_pointer_position ptr_pos;
226 struct synthvid_pointer_shape ptr_shape;
227 struct synthvid_feature_change feature_chg;
228 struct synthvid_dirt dirt;
229 struct synthvid_supported_resolution_req resolution_req;
230 struct synthvid_supported_resolution_resp resolution_resp;
231 };
232 } __packed;
233
234
235 /* FB driver definitions and structures */
236 #define HVFB_WIDTH 1152 /* default screen width */
237 #define HVFB_HEIGHT 864 /* default screen height */
238 #define HVFB_WIDTH_MIN 640
239 #define HVFB_HEIGHT_MIN 480
240
241 #define RING_BUFSIZE (256 * 1024)
242 #define VSP_TIMEOUT (10 * HZ)
243 #define HVFB_UPDATE_DELAY (HZ / 20)
244 #define HVFB_ONDEMAND_THROTTLE (HZ / 20)
245
246 struct hvfb_par {
247 struct fb_info *info;
248 struct resource *mem;
249 bool fb_ready; /* fb device is ready */
250 struct completion wait;
251 u32 synthvid_version;
252
253 struct delayed_work dwork;
254 bool update;
255 bool update_saved; /* The value of 'update' before hibernation */
256
257 u32 pseudo_palette[16];
258 u8 init_buf[MAX_VMBUS_PKT_SIZE];
259 u8 recv_buf[MAX_VMBUS_PKT_SIZE];
260
261 /* If true, the VSC notifies the VSP on every framebuffer change */
262 bool synchronous_fb;
263
264 /* If true, need to copy from deferred IO mem to framebuffer mem */
265 bool need_docopy;
266
267 struct notifier_block hvfb_panic_nb;
268
269 /* Memory for deferred IO and frame buffer itself */
270 unsigned char *dio_vp;
271 unsigned char *mmio_vp;
272 phys_addr_t mmio_pp;
273
274 /* Dirty rectangle, protected by delayed_refresh_lock */
275 int x1, y1, x2, y2;
276 bool delayed_refresh;
277 spinlock_t delayed_refresh_lock;
278 };
279
280 static uint screen_width = HVFB_WIDTH;
281 static uint screen_height = HVFB_HEIGHT;
282 static uint screen_depth;
283 static uint screen_fb_size;
284 static uint dio_fb_size; /* FB size for deferred IO */
285
286 /* Send message to Hyper-V host */
synthvid_send(struct hv_device * hdev,struct synthvid_msg * msg)287 static inline int synthvid_send(struct hv_device *hdev,
288 struct synthvid_msg *msg)
289 {
290 static atomic64_t request_id = ATOMIC64_INIT(0);
291 int ret;
292
293 msg->pipe_hdr.type = PIPE_MSG_DATA;
294 msg->pipe_hdr.size = msg->vid_hdr.size;
295
296 ret = vmbus_sendpacket(hdev->channel, msg,
297 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr),
298 atomic64_inc_return(&request_id),
299 VM_PKT_DATA_INBAND, 0);
300
301 if (ret)
302 pr_err_ratelimited("Unable to send packet via vmbus; error %d\n", ret);
303
304 return ret;
305 }
306
307
308 /* Send screen resolution info to host */
synthvid_send_situ(struct hv_device * hdev)309 static int synthvid_send_situ(struct hv_device *hdev)
310 {
311 struct fb_info *info = hv_get_drvdata(hdev);
312 struct synthvid_msg msg;
313
314 if (!info)
315 return -ENODEV;
316
317 memset(&msg, 0, sizeof(struct synthvid_msg));
318
319 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
320 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
321 sizeof(struct synthvid_situation_update);
322 msg.situ.user_ctx = 0;
323 msg.situ.video_output_count = 1;
324 msg.situ.video_output[0].active = 1;
325 msg.situ.video_output[0].vram_offset = 0;
326 msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel;
327 msg.situ.video_output[0].width_pixels = info->var.xres;
328 msg.situ.video_output[0].height_pixels = info->var.yres;
329 msg.situ.video_output[0].pitch_bytes = info->fix.line_length;
330
331 synthvid_send(hdev, &msg);
332
333 return 0;
334 }
335
336 /* Send mouse pointer info to host */
synthvid_send_ptr(struct hv_device * hdev)337 static int synthvid_send_ptr(struct hv_device *hdev)
338 {
339 struct synthvid_msg msg;
340
341 memset(&msg, 0, sizeof(struct synthvid_msg));
342 msg.vid_hdr.type = SYNTHVID_POINTER_POSITION;
343 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
344 sizeof(struct synthvid_pointer_position);
345 msg.ptr_pos.is_visible = 1;
346 msg.ptr_pos.video_output = 0;
347 msg.ptr_pos.image_x = 0;
348 msg.ptr_pos.image_y = 0;
349 synthvid_send(hdev, &msg);
350
351 memset(&msg, 0, sizeof(struct synthvid_msg));
352 msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE;
353 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
354 sizeof(struct synthvid_pointer_shape);
355 msg.ptr_shape.part_idx = CURSOR_COMPLETE;
356 msg.ptr_shape.is_argb = 1;
357 msg.ptr_shape.width = 1;
358 msg.ptr_shape.height = 1;
359 msg.ptr_shape.hot_x = 0;
360 msg.ptr_shape.hot_y = 0;
361 msg.ptr_shape.data[0] = 0;
362 msg.ptr_shape.data[1] = 1;
363 msg.ptr_shape.data[2] = 1;
364 msg.ptr_shape.data[3] = 1;
365 synthvid_send(hdev, &msg);
366
367 return 0;
368 }
369
370 /* Send updated screen area (dirty rectangle) location to host */
371 static int
synthvid_update(struct fb_info * info,int x1,int y1,int x2,int y2)372 synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2)
373 {
374 struct hv_device *hdev = device_to_hv_device(info->device);
375 struct synthvid_msg msg;
376
377 memset(&msg, 0, sizeof(struct synthvid_msg));
378 if (x2 == INT_MAX)
379 x2 = info->var.xres;
380 if (y2 == INT_MAX)
381 y2 = info->var.yres;
382
383 msg.vid_hdr.type = SYNTHVID_DIRT;
384 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
385 sizeof(struct synthvid_dirt);
386 msg.dirt.video_output = 0;
387 msg.dirt.dirt_count = 1;
388 msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1;
389 msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1;
390 msg.dirt.rect[0].x2 =
391 (x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2;
392 msg.dirt.rect[0].y2 =
393 (y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2;
394
395 synthvid_send(hdev, &msg);
396
397 return 0;
398 }
399
hvfb_docopy(struct hvfb_par * par,unsigned long offset,unsigned long size)400 static void hvfb_docopy(struct hvfb_par *par,
401 unsigned long offset,
402 unsigned long size)
403 {
404 if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready ||
405 size == 0 || offset >= dio_fb_size)
406 return;
407
408 if (offset + size > dio_fb_size)
409 size = dio_fb_size - offset;
410
411 memcpy(par->mmio_vp + offset, par->dio_vp + offset, size);
412 }
413
414 /* Deferred IO callback */
synthvid_deferred_io(struct fb_info * p,struct list_head * pagereflist)415 static void synthvid_deferred_io(struct fb_info *p, struct list_head *pagereflist)
416 {
417 struct hvfb_par *par = p->par;
418 struct fb_deferred_io_pageref *pageref;
419 unsigned long start, end;
420 int y1, y2, miny, maxy;
421
422 miny = INT_MAX;
423 maxy = 0;
424
425 /*
426 * Merge dirty pages. It is possible that last page cross
427 * over the end of frame buffer row yres. This is taken care of
428 * in synthvid_update function by clamping the y2
429 * value to yres.
430 */
431 list_for_each_entry(pageref, pagereflist, list) {
432 start = pageref->offset;
433 end = start + PAGE_SIZE - 1;
434 y1 = start / p->fix.line_length;
435 y2 = end / p->fix.line_length;
436 miny = min_t(int, miny, y1);
437 maxy = max_t(int, maxy, y2);
438
439 /* Copy from dio space to mmio address */
440 if (par->fb_ready && par->need_docopy)
441 hvfb_docopy(par, start, PAGE_SIZE);
442 }
443
444 if (par->fb_ready && par->update)
445 synthvid_update(p, 0, miny, p->var.xres, maxy + 1);
446 }
447
448 static struct fb_deferred_io synthvid_defio = {
449 .delay = HZ / 20,
450 .deferred_io = synthvid_deferred_io,
451 };
452
453 /*
454 * Actions on received messages from host:
455 * Complete the wait event.
456 * Or, reply with screen and cursor info.
457 */
synthvid_recv_sub(struct hv_device * hdev)458 static void synthvid_recv_sub(struct hv_device *hdev)
459 {
460 struct fb_info *info = hv_get_drvdata(hdev);
461 struct hvfb_par *par;
462 struct synthvid_msg *msg;
463
464 if (!info)
465 return;
466
467 par = info->par;
468 msg = (struct synthvid_msg *)par->recv_buf;
469
470 /* Complete the wait event */
471 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
472 msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE ||
473 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
474 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE);
475 complete(&par->wait);
476 return;
477 }
478
479 /* Reply with screen and cursor info */
480 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) {
481 if (par->fb_ready) {
482 synthvid_send_ptr(hdev);
483 synthvid_send_situ(hdev);
484 }
485
486 par->update = msg->feature_chg.is_dirt_needed;
487 if (par->update)
488 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
489 }
490 }
491
492 /* Receive callback for messages from the host */
synthvid_receive(void * ctx)493 static void synthvid_receive(void *ctx)
494 {
495 struct hv_device *hdev = ctx;
496 struct fb_info *info = hv_get_drvdata(hdev);
497 struct hvfb_par *par;
498 struct synthvid_msg *recv_buf;
499 u32 bytes_recvd;
500 u64 req_id;
501 int ret;
502
503 if (!info)
504 return;
505
506 par = info->par;
507 recv_buf = (struct synthvid_msg *)par->recv_buf;
508
509 do {
510 ret = vmbus_recvpacket(hdev->channel, recv_buf,
511 MAX_VMBUS_PKT_SIZE,
512 &bytes_recvd, &req_id);
513 if (bytes_recvd > 0 &&
514 recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
515 synthvid_recv_sub(hdev);
516 } while (bytes_recvd > 0 && ret == 0);
517 }
518
519 /* Check if the ver1 version is equal or greater than ver2 */
synthvid_ver_ge(u32 ver1,u32 ver2)520 static inline bool synthvid_ver_ge(u32 ver1, u32 ver2)
521 {
522 if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) ||
523 (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) &&
524 SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2)))
525 return true;
526
527 return false;
528 }
529
530 /* Check synthetic video protocol version with the host */
synthvid_negotiate_ver(struct hv_device * hdev,u32 ver)531 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver)
532 {
533 struct fb_info *info = hv_get_drvdata(hdev);
534 struct hvfb_par *par = info->par;
535 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
536 int ret = 0;
537 unsigned long t;
538
539 memset(msg, 0, sizeof(struct synthvid_msg));
540 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
541 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
542 sizeof(struct synthvid_version_req);
543 msg->ver_req.version = ver;
544 synthvid_send(hdev, msg);
545
546 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
547 if (!t) {
548 pr_err("Time out on waiting version response\n");
549 ret = -ETIMEDOUT;
550 goto out;
551 }
552 if (!msg->ver_resp.is_accepted) {
553 ret = -ENODEV;
554 goto out;
555 }
556
557 par->synthvid_version = ver;
558 pr_info("Synthvid Version major %d, minor %d\n",
559 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver));
560
561 out:
562 return ret;
563 }
564
565 /* Get current resolution from the host */
synthvid_get_supported_resolution(struct hv_device * hdev)566 static int synthvid_get_supported_resolution(struct hv_device *hdev)
567 {
568 struct fb_info *info = hv_get_drvdata(hdev);
569 struct hvfb_par *par = info->par;
570 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
571 int ret = 0;
572 unsigned long t;
573 u8 index;
574
575 memset(msg, 0, sizeof(struct synthvid_msg));
576 msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST;
577 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
578 sizeof(struct synthvid_supported_resolution_req);
579
580 msg->resolution_req.maximum_resolution_count =
581 SYNTHVID_MAX_RESOLUTION_COUNT;
582 synthvid_send(hdev, msg);
583
584 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
585 if (!t) {
586 pr_err("Time out on waiting resolution response\n");
587 ret = -ETIMEDOUT;
588 goto out;
589 }
590
591 if (msg->resolution_resp.resolution_count == 0) {
592 pr_err("No supported resolutions\n");
593 ret = -ENODEV;
594 goto out;
595 }
596
597 index = msg->resolution_resp.default_resolution_index;
598 if (index >= msg->resolution_resp.resolution_count) {
599 pr_err("Invalid resolution index: %d\n", index);
600 ret = -ENODEV;
601 goto out;
602 }
603
604 screen_width =
605 msg->resolution_resp.supported_resolution[index].width;
606 screen_height =
607 msg->resolution_resp.supported_resolution[index].height;
608
609 out:
610 return ret;
611 }
612
613 /* Connect to VSP (Virtual Service Provider) on host */
synthvid_connect_vsp(struct hv_device * hdev)614 static int synthvid_connect_vsp(struct hv_device *hdev)
615 {
616 struct fb_info *info = hv_get_drvdata(hdev);
617 struct hvfb_par *par = info->par;
618 int ret;
619
620 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE,
621 NULL, 0, synthvid_receive, hdev);
622 if (ret) {
623 pr_err("Unable to open vmbus channel\n");
624 return ret;
625 }
626
627 /* Negotiate the protocol version with host */
628 switch (vmbus_proto_version) {
629 case VERSION_WIN10:
630 case VERSION_WIN10_V5:
631 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
632 if (!ret)
633 break;
634 fallthrough;
635 case VERSION_WIN8:
636 case VERSION_WIN8_1:
637 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8);
638 break;
639 default:
640 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
641 break;
642 }
643
644 if (ret) {
645 pr_err("Synthetic video device version not accepted\n");
646 goto error;
647 }
648
649 screen_depth = SYNTHVID_DEPTH_WIN8;
650 if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) {
651 ret = synthvid_get_supported_resolution(hdev);
652 if (ret)
653 pr_info("Failed to get supported resolution from host, use default\n");
654 }
655
656 screen_fb_size = hdev->channel->offermsg.offer.
657 mmio_megabytes * 1024 * 1024;
658
659 return 0;
660
661 error:
662 vmbus_close(hdev->channel);
663 return ret;
664 }
665
666 /* Send VRAM and Situation messages to the host */
synthvid_send_config(struct hv_device * hdev)667 static int synthvid_send_config(struct hv_device *hdev)
668 {
669 struct fb_info *info = hv_get_drvdata(hdev);
670 struct hvfb_par *par = info->par;
671 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
672 int ret = 0;
673 unsigned long t;
674
675 /* Send VRAM location */
676 memset(msg, 0, sizeof(struct synthvid_msg));
677 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
678 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
679 sizeof(struct synthvid_vram_location);
680 msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp;
681 msg->vram.is_vram_gpa_specified = 1;
682 synthvid_send(hdev, msg);
683
684 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
685 if (!t) {
686 pr_err("Time out on waiting vram location ack\n");
687 ret = -ETIMEDOUT;
688 goto out;
689 }
690 if (msg->vram_ack.user_ctx != par->mmio_pp) {
691 pr_err("Unable to set VRAM location\n");
692 ret = -ENODEV;
693 goto out;
694 }
695
696 /* Send pointer and situation update */
697 synthvid_send_ptr(hdev);
698 synthvid_send_situ(hdev);
699
700 out:
701 return ret;
702 }
703
704
705 /*
706 * Delayed work callback:
707 * It is scheduled to call whenever update request is received and it has
708 * not been called in last HVFB_ONDEMAND_THROTTLE time interval.
709 */
hvfb_update_work(struct work_struct * w)710 static void hvfb_update_work(struct work_struct *w)
711 {
712 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work);
713 struct fb_info *info = par->info;
714 unsigned long flags;
715 int x1, x2, y1, y2;
716 int j;
717
718 spin_lock_irqsave(&par->delayed_refresh_lock, flags);
719 /* Reset the request flag */
720 par->delayed_refresh = false;
721
722 /* Store the dirty rectangle to local variables */
723 x1 = par->x1;
724 x2 = par->x2;
725 y1 = par->y1;
726 y2 = par->y2;
727
728 /* Clear dirty rectangle */
729 par->x1 = par->y1 = INT_MAX;
730 par->x2 = par->y2 = 0;
731
732 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
733
734 if (x1 > info->var.xres || x2 > info->var.xres ||
735 y1 > info->var.yres || y2 > info->var.yres || x2 <= x1)
736 return;
737
738 /* Copy the dirty rectangle to frame buffer memory */
739 if (par->need_docopy)
740 for (j = y1; j < y2; j++)
741 hvfb_docopy(par,
742 j * info->fix.line_length +
743 (x1 * screen_depth / 8),
744 (x2 - x1) * screen_depth / 8);
745
746 /* Refresh */
747 if (par->fb_ready && par->update)
748 synthvid_update(info, x1, y1, x2, y2);
749 }
750
751 /*
752 * Control the on-demand refresh frequency. It schedules a delayed
753 * screen update if it has not yet.
754 */
hvfb_ondemand_refresh_throttle(struct hvfb_par * par,int x1,int y1,int w,int h)755 static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par,
756 int x1, int y1, int w, int h)
757 {
758 unsigned long flags;
759 int x2 = x1 + w;
760 int y2 = y1 + h;
761
762 spin_lock_irqsave(&par->delayed_refresh_lock, flags);
763
764 /* Merge dirty rectangle */
765 par->x1 = min_t(int, par->x1, x1);
766 par->y1 = min_t(int, par->y1, y1);
767 par->x2 = max_t(int, par->x2, x2);
768 par->y2 = max_t(int, par->y2, y2);
769
770 /* Schedule a delayed screen update if not yet */
771 if (par->delayed_refresh == false) {
772 schedule_delayed_work(&par->dwork,
773 HVFB_ONDEMAND_THROTTLE);
774 par->delayed_refresh = true;
775 }
776
777 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
778 }
779
hvfb_on_panic(struct notifier_block * nb,unsigned long e,void * p)780 static int hvfb_on_panic(struct notifier_block *nb,
781 unsigned long e, void *p)
782 {
783 struct hvfb_par *par;
784 struct fb_info *info;
785
786 par = container_of(nb, struct hvfb_par, hvfb_panic_nb);
787 par->synchronous_fb = true;
788 info = par->info;
789 if (par->need_docopy)
790 hvfb_docopy(par, 0, dio_fb_size);
791 synthvid_update(info, 0, 0, INT_MAX, INT_MAX);
792
793 return NOTIFY_DONE;
794 }
795
796 /* Framebuffer operation handlers */
797
hvfb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)798 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
799 {
800 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN ||
801 var->xres > screen_width || var->yres > screen_height ||
802 var->bits_per_pixel != screen_depth)
803 return -EINVAL;
804
805 var->xres_virtual = var->xres;
806 var->yres_virtual = var->yres;
807
808 return 0;
809 }
810
hvfb_set_par(struct fb_info * info)811 static int hvfb_set_par(struct fb_info *info)
812 {
813 struct hv_device *hdev = device_to_hv_device(info->device);
814
815 return synthvid_send_situ(hdev);
816 }
817
818
chan_to_field(u32 chan,struct fb_bitfield * bf)819 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf)
820 {
821 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
822 }
823
hvfb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)824 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green,
825 unsigned blue, unsigned transp, struct fb_info *info)
826 {
827 u32 *pal = info->pseudo_palette;
828
829 if (regno > 15)
830 return -EINVAL;
831
832 pal[regno] = chan_to_field(red, &info->var.red)
833 | chan_to_field(green, &info->var.green)
834 | chan_to_field(blue, &info->var.blue)
835 | chan_to_field(transp, &info->var.transp);
836
837 return 0;
838 }
839
hvfb_blank(int blank,struct fb_info * info)840 static int hvfb_blank(int blank, struct fb_info *info)
841 {
842 return 1; /* get fb_blank to set the colormap to all black */
843 }
844
hvfb_cfb_fillrect(struct fb_info * p,const struct fb_fillrect * rect)845 static void hvfb_cfb_fillrect(struct fb_info *p,
846 const struct fb_fillrect *rect)
847 {
848 struct hvfb_par *par = p->par;
849
850 cfb_fillrect(p, rect);
851 if (par->synchronous_fb)
852 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
853 else
854 hvfb_ondemand_refresh_throttle(par, rect->dx, rect->dy,
855 rect->width, rect->height);
856 }
857
hvfb_cfb_copyarea(struct fb_info * p,const struct fb_copyarea * area)858 static void hvfb_cfb_copyarea(struct fb_info *p,
859 const struct fb_copyarea *area)
860 {
861 struct hvfb_par *par = p->par;
862
863 cfb_copyarea(p, area);
864 if (par->synchronous_fb)
865 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
866 else
867 hvfb_ondemand_refresh_throttle(par, area->dx, area->dy,
868 area->width, area->height);
869 }
870
hvfb_cfb_imageblit(struct fb_info * p,const struct fb_image * image)871 static void hvfb_cfb_imageblit(struct fb_info *p,
872 const struct fb_image *image)
873 {
874 struct hvfb_par *par = p->par;
875
876 cfb_imageblit(p, image);
877 if (par->synchronous_fb)
878 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
879 else
880 hvfb_ondemand_refresh_throttle(par, image->dx, image->dy,
881 image->width, image->height);
882 }
883
884 static const struct fb_ops hvfb_ops = {
885 .owner = THIS_MODULE,
886 .fb_check_var = hvfb_check_var,
887 .fb_set_par = hvfb_set_par,
888 .fb_setcolreg = hvfb_setcolreg,
889 .fb_fillrect = hvfb_cfb_fillrect,
890 .fb_copyarea = hvfb_cfb_copyarea,
891 .fb_imageblit = hvfb_cfb_imageblit,
892 .fb_blank = hvfb_blank,
893 .fb_mmap = fb_deferred_io_mmap,
894 };
895
896
897 /* Get options from kernel paramenter "video=" */
hvfb_get_option(struct fb_info * info)898 static void hvfb_get_option(struct fb_info *info)
899 {
900 struct hvfb_par *par = info->par;
901 char *opt = NULL, *p;
902 uint x = 0, y = 0;
903
904 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt)
905 return;
906
907 p = strsep(&opt, "x");
908 if (!*p || kstrtouint(p, 0, &x) ||
909 !opt || !*opt || kstrtouint(opt, 0, &y)) {
910 pr_err("Screen option is invalid: skipped\n");
911 return;
912 }
913
914 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN ||
915 (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) &&
916 (x * y * screen_depth / 8 > screen_fb_size)) ||
917 (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
918 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8)) {
919 pr_err("Screen resolution option is out of range: skipped\n");
920 return;
921 }
922
923 screen_width = x;
924 screen_height = y;
925 return;
926 }
927
928 /*
929 * Allocate enough contiguous physical memory.
930 * Return physical address if succeeded or -1 if failed.
931 */
hvfb_get_phymem(struct hv_device * hdev,unsigned int request_size)932 static phys_addr_t hvfb_get_phymem(struct hv_device *hdev,
933 unsigned int request_size)
934 {
935 struct page *page = NULL;
936 dma_addr_t dma_handle;
937 void *vmem;
938 phys_addr_t paddr = 0;
939 unsigned int order = get_order(request_size);
940
941 if (request_size == 0)
942 return -1;
943
944 if (order < MAX_ORDER) {
945 /* Call alloc_pages if the size is less than 2^MAX_ORDER */
946 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
947 if (!page)
948 return -1;
949
950 paddr = (page_to_pfn(page) << PAGE_SHIFT);
951 } else {
952 /* Allocate from CMA */
953 hdev->device.coherent_dma_mask = DMA_BIT_MASK(64);
954
955 vmem = dma_alloc_coherent(&hdev->device,
956 round_up(request_size, PAGE_SIZE),
957 &dma_handle,
958 GFP_KERNEL | __GFP_NOWARN);
959
960 if (!vmem)
961 return -1;
962
963 paddr = virt_to_phys(vmem);
964 }
965
966 return paddr;
967 }
968
969 /* Release contiguous physical memory */
hvfb_release_phymem(struct hv_device * hdev,phys_addr_t paddr,unsigned int size)970 static void hvfb_release_phymem(struct hv_device *hdev,
971 phys_addr_t paddr, unsigned int size)
972 {
973 unsigned int order = get_order(size);
974
975 if (order < MAX_ORDER)
976 __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order);
977 else
978 dma_free_coherent(&hdev->device,
979 round_up(size, PAGE_SIZE),
980 phys_to_virt(paddr),
981 paddr);
982 }
983
984
985 /* Get framebuffer memory from Hyper-V video pci space */
hvfb_getmem(struct hv_device * hdev,struct fb_info * info)986 static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
987 {
988 struct hvfb_par *par = info->par;
989 struct pci_dev *pdev = NULL;
990 void __iomem *fb_virt;
991 int gen2vm = efi_enabled(EFI_BOOT);
992 phys_addr_t paddr;
993 int ret;
994
995 info->apertures = alloc_apertures(1);
996 if (!info->apertures)
997 return -ENOMEM;
998
999 if (!gen2vm) {
1000 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
1001 PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
1002 if (!pdev) {
1003 pr_err("Unable to find PCI Hyper-V video\n");
1004 return -ENODEV;
1005 }
1006
1007 info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
1008 info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
1009
1010 /*
1011 * For Gen 1 VM, we can directly use the contiguous memory
1012 * from VM. If we succeed, deferred IO happens directly
1013 * on this allocated framebuffer memory, avoiding extra
1014 * memory copy.
1015 */
1016 paddr = hvfb_get_phymem(hdev, screen_fb_size);
1017 if (paddr != (phys_addr_t) -1) {
1018 par->mmio_pp = paddr;
1019 par->mmio_vp = par->dio_vp = __va(paddr);
1020
1021 info->fix.smem_start = paddr;
1022 info->fix.smem_len = screen_fb_size;
1023 info->screen_base = par->mmio_vp;
1024 info->screen_size = screen_fb_size;
1025
1026 par->need_docopy = false;
1027 goto getmem_done;
1028 }
1029 pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n");
1030 } else {
1031 info->apertures->ranges[0].base = screen_info.lfb_base;
1032 info->apertures->ranges[0].size = screen_info.lfb_size;
1033 }
1034
1035 /*
1036 * Cannot use the contiguous physical memory.
1037 * Allocate mmio space for framebuffer.
1038 */
1039 dio_fb_size =
1040 screen_width * screen_height * screen_depth / 8;
1041
1042 ret = vmbus_allocate_mmio(&par->mem, hdev, 0, -1,
1043 screen_fb_size, 0x100000, true);
1044 if (ret != 0) {
1045 pr_err("Unable to allocate framebuffer memory\n");
1046 goto err1;
1047 }
1048
1049 /*
1050 * Map the VRAM cacheable for performance. This is also required for
1051 * VM Connect to display properly for ARM64 Linux VM, as the host also
1052 * maps the VRAM cacheable.
1053 */
1054 fb_virt = ioremap_cache(par->mem->start, screen_fb_size);
1055 if (!fb_virt)
1056 goto err2;
1057
1058 /* Allocate memory for deferred IO */
1059 par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE));
1060 if (par->dio_vp == NULL)
1061 goto err3;
1062
1063 /* Physical address of FB device */
1064 par->mmio_pp = par->mem->start;
1065 /* Virtual address of FB device */
1066 par->mmio_vp = (unsigned char *) fb_virt;
1067
1068 info->fix.smem_start = par->mem->start;
1069 info->fix.smem_len = dio_fb_size;
1070 info->screen_base = par->dio_vp;
1071 info->screen_size = dio_fb_size;
1072
1073 getmem_done:
1074 aperture_remove_conflicting_devices(info->apertures->ranges[0].base,
1075 info->apertures->ranges[0].size,
1076 false, KBUILD_MODNAME);
1077
1078 if (gen2vm) {
1079 /* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */
1080 screen_info.lfb_size = 0;
1081 screen_info.lfb_base = 0;
1082 screen_info.orig_video_isVGA = 0;
1083 } else {
1084 pci_dev_put(pdev);
1085 }
1086
1087 return 0;
1088
1089 err3:
1090 iounmap(fb_virt);
1091 err2:
1092 vmbus_free_mmio(par->mem->start, screen_fb_size);
1093 par->mem = NULL;
1094 err1:
1095 if (!gen2vm)
1096 pci_dev_put(pdev);
1097
1098 return -ENOMEM;
1099 }
1100
1101 /* Release the framebuffer */
hvfb_putmem(struct hv_device * hdev,struct fb_info * info)1102 static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info)
1103 {
1104 struct hvfb_par *par = info->par;
1105
1106 if (par->need_docopy) {
1107 vfree(par->dio_vp);
1108 iounmap(info->screen_base);
1109 vmbus_free_mmio(par->mem->start, screen_fb_size);
1110 } else {
1111 hvfb_release_phymem(hdev, info->fix.smem_start,
1112 screen_fb_size);
1113 }
1114
1115 par->mem = NULL;
1116 }
1117
1118
hvfb_probe(struct hv_device * hdev,const struct hv_vmbus_device_id * dev_id)1119 static int hvfb_probe(struct hv_device *hdev,
1120 const struct hv_vmbus_device_id *dev_id)
1121 {
1122 struct fb_info *info;
1123 struct hvfb_par *par;
1124 int ret;
1125
1126 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device);
1127 if (!info)
1128 return -ENOMEM;
1129
1130 par = info->par;
1131 par->info = info;
1132 par->fb_ready = false;
1133 par->need_docopy = true;
1134 init_completion(&par->wait);
1135 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
1136
1137 par->delayed_refresh = false;
1138 spin_lock_init(&par->delayed_refresh_lock);
1139 par->x1 = par->y1 = INT_MAX;
1140 par->x2 = par->y2 = 0;
1141
1142 /* Connect to VSP */
1143 hv_set_drvdata(hdev, info);
1144 ret = synthvid_connect_vsp(hdev);
1145 if (ret) {
1146 pr_err("Unable to connect to VSP\n");
1147 goto error1;
1148 }
1149
1150 hvfb_get_option(info);
1151 pr_info("Screen resolution: %dx%d, Color depth: %d, Frame buffer size: %d\n",
1152 screen_width, screen_height, screen_depth, screen_fb_size);
1153
1154 ret = hvfb_getmem(hdev, info);
1155 if (ret) {
1156 pr_err("No memory for framebuffer\n");
1157 goto error2;
1158 }
1159
1160 /* Set up fb_info */
1161 info->flags = FBINFO_DEFAULT;
1162
1163 info->var.xres_virtual = info->var.xres = screen_width;
1164 info->var.yres_virtual = info->var.yres = screen_height;
1165 info->var.bits_per_pixel = screen_depth;
1166
1167 if (info->var.bits_per_pixel == 16) {
1168 info->var.red = (struct fb_bitfield){11, 5, 0};
1169 info->var.green = (struct fb_bitfield){5, 6, 0};
1170 info->var.blue = (struct fb_bitfield){0, 5, 0};
1171 info->var.transp = (struct fb_bitfield){0, 0, 0};
1172 } else {
1173 info->var.red = (struct fb_bitfield){16, 8, 0};
1174 info->var.green = (struct fb_bitfield){8, 8, 0};
1175 info->var.blue = (struct fb_bitfield){0, 8, 0};
1176 info->var.transp = (struct fb_bitfield){24, 8, 0};
1177 }
1178
1179 info->var.activate = FB_ACTIVATE_NOW;
1180 info->var.height = -1;
1181 info->var.width = -1;
1182 info->var.vmode = FB_VMODE_NONINTERLACED;
1183
1184 strcpy(info->fix.id, KBUILD_MODNAME);
1185 info->fix.type = FB_TYPE_PACKED_PIXELS;
1186 info->fix.visual = FB_VISUAL_TRUECOLOR;
1187 info->fix.line_length = screen_width * screen_depth / 8;
1188 info->fix.accel = FB_ACCEL_NONE;
1189
1190 info->fbops = &hvfb_ops;
1191 info->pseudo_palette = par->pseudo_palette;
1192
1193 /* Initialize deferred IO */
1194 info->fbdefio = &synthvid_defio;
1195 fb_deferred_io_init(info);
1196
1197 /* Send config to host */
1198 ret = synthvid_send_config(hdev);
1199 if (ret)
1200 goto error;
1201
1202 ret = register_framebuffer(info);
1203 if (ret) {
1204 pr_err("Unable to register framebuffer\n");
1205 goto error;
1206 }
1207
1208 par->fb_ready = true;
1209
1210 par->synchronous_fb = false;
1211 par->hvfb_panic_nb.notifier_call = hvfb_on_panic;
1212 atomic_notifier_chain_register(&panic_notifier_list,
1213 &par->hvfb_panic_nb);
1214
1215 return 0;
1216
1217 error:
1218 fb_deferred_io_cleanup(info);
1219 hvfb_putmem(hdev, info);
1220 error2:
1221 vmbus_close(hdev->channel);
1222 error1:
1223 cancel_delayed_work_sync(&par->dwork);
1224 hv_set_drvdata(hdev, NULL);
1225 framebuffer_release(info);
1226 return ret;
1227 }
1228
1229
hvfb_remove(struct hv_device * hdev)1230 static int hvfb_remove(struct hv_device *hdev)
1231 {
1232 struct fb_info *info = hv_get_drvdata(hdev);
1233 struct hvfb_par *par = info->par;
1234
1235 atomic_notifier_chain_unregister(&panic_notifier_list,
1236 &par->hvfb_panic_nb);
1237
1238 par->update = false;
1239 par->fb_ready = false;
1240
1241 fb_deferred_io_cleanup(info);
1242
1243 unregister_framebuffer(info);
1244 cancel_delayed_work_sync(&par->dwork);
1245
1246 vmbus_close(hdev->channel);
1247 hv_set_drvdata(hdev, NULL);
1248
1249 hvfb_putmem(hdev, info);
1250 framebuffer_release(info);
1251
1252 return 0;
1253 }
1254
hvfb_suspend(struct hv_device * hdev)1255 static int hvfb_suspend(struct hv_device *hdev)
1256 {
1257 struct fb_info *info = hv_get_drvdata(hdev);
1258 struct hvfb_par *par = info->par;
1259
1260 console_lock();
1261
1262 /* 1 means do suspend */
1263 fb_set_suspend(info, 1);
1264
1265 cancel_delayed_work_sync(&par->dwork);
1266 cancel_delayed_work_sync(&info->deferred_work);
1267
1268 par->update_saved = par->update;
1269 par->update = false;
1270 par->fb_ready = false;
1271
1272 vmbus_close(hdev->channel);
1273
1274 console_unlock();
1275
1276 return 0;
1277 }
1278
hvfb_resume(struct hv_device * hdev)1279 static int hvfb_resume(struct hv_device *hdev)
1280 {
1281 struct fb_info *info = hv_get_drvdata(hdev);
1282 struct hvfb_par *par = info->par;
1283 int ret;
1284
1285 console_lock();
1286
1287 ret = synthvid_connect_vsp(hdev);
1288 if (ret != 0)
1289 goto out;
1290
1291 ret = synthvid_send_config(hdev);
1292 if (ret != 0) {
1293 vmbus_close(hdev->channel);
1294 goto out;
1295 }
1296
1297 par->fb_ready = true;
1298 par->update = par->update_saved;
1299
1300 schedule_delayed_work(&info->deferred_work, info->fbdefio->delay);
1301 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
1302
1303 /* 0 means do resume */
1304 fb_set_suspend(info, 0);
1305
1306 out:
1307 console_unlock();
1308
1309 return ret;
1310 }
1311
1312
1313 static const struct pci_device_id pci_stub_id_table[] = {
1314 {
1315 .vendor = PCI_VENDOR_ID_MICROSOFT,
1316 .device = PCI_DEVICE_ID_HYPERV_VIDEO,
1317 },
1318 { /* end of list */ }
1319 };
1320
1321 static const struct hv_vmbus_device_id id_table[] = {
1322 /* Synthetic Video Device GUID */
1323 {HV_SYNTHVID_GUID},
1324 {}
1325 };
1326
1327 MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
1328 MODULE_DEVICE_TABLE(vmbus, id_table);
1329
1330 static struct hv_driver hvfb_drv = {
1331 .name = KBUILD_MODNAME,
1332 .id_table = id_table,
1333 .probe = hvfb_probe,
1334 .remove = hvfb_remove,
1335 .suspend = hvfb_suspend,
1336 .resume = hvfb_resume,
1337 .driver = {
1338 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1339 },
1340 };
1341
hvfb_pci_stub_probe(struct pci_dev * pdev,const struct pci_device_id * ent)1342 static int hvfb_pci_stub_probe(struct pci_dev *pdev,
1343 const struct pci_device_id *ent)
1344 {
1345 return 0;
1346 }
1347
hvfb_pci_stub_remove(struct pci_dev * pdev)1348 static void hvfb_pci_stub_remove(struct pci_dev *pdev)
1349 {
1350 }
1351
1352 static struct pci_driver hvfb_pci_stub_driver = {
1353 .name = KBUILD_MODNAME,
1354 .id_table = pci_stub_id_table,
1355 .probe = hvfb_pci_stub_probe,
1356 .remove = hvfb_pci_stub_remove,
1357 .driver = {
1358 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1359 }
1360 };
1361
hvfb_drv_init(void)1362 static int __init hvfb_drv_init(void)
1363 {
1364 int ret;
1365
1366 ret = vmbus_driver_register(&hvfb_drv);
1367 if (ret != 0)
1368 return ret;
1369
1370 ret = pci_register_driver(&hvfb_pci_stub_driver);
1371 if (ret != 0) {
1372 vmbus_driver_unregister(&hvfb_drv);
1373 return ret;
1374 }
1375
1376 return 0;
1377 }
1378
hvfb_drv_exit(void)1379 static void __exit hvfb_drv_exit(void)
1380 {
1381 pci_unregister_driver(&hvfb_pci_stub_driver);
1382 vmbus_driver_unregister(&hvfb_drv);
1383 }
1384
1385 module_init(hvfb_drv_init);
1386 module_exit(hvfb_drv_exit);
1387
1388 MODULE_LICENSE("GPL");
1389 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver");
1390
