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/module.h>
49 #include <linux/kernel.h>
50 #include <linux/vmalloc.h>
51 #include <linux/init.h>
52 #include <linux/completion.h>
53 #include <linux/fb.h>
54 #include <linux/pci.h>
55 #include <linux/panic_notifier.h>
56 #include <linux/efi.h>
57 #include <linux/console.h>
58
59 #include <linux/hyperv.h>
60
61
62 /* Hyper-V Synthetic Video Protocol definitions and structures */
63 #define MAX_VMBUS_PKT_SIZE 0x4000
64
65 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
66 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
67 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
68 #define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5)
69
70 #define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff)
71 #define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16)
72
73 #define SYNTHVID_DEPTH_WIN7 16
74 #define SYNTHVID_DEPTH_WIN8 32
75
76 #define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024)
77 #define SYNTHVID_WIDTH_MAX_WIN7 1600
78 #define SYNTHVID_HEIGHT_MAX_WIN7 1200
79
80 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
81
82 #define PCI_VENDOR_ID_MICROSOFT 0x1414
83 #define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353
84
85
86 enum pipe_msg_type {
87 PIPE_MSG_INVALID,
88 PIPE_MSG_DATA,
89 PIPE_MSG_MAX
90 };
91
92 struct pipe_msg_hdr {
93 u32 type;
94 u32 size; /* size of message after this field */
95 } __packed;
96
97
98 enum synthvid_msg_type {
99 SYNTHVID_ERROR = 0,
100 SYNTHVID_VERSION_REQUEST = 1,
101 SYNTHVID_VERSION_RESPONSE = 2,
102 SYNTHVID_VRAM_LOCATION = 3,
103 SYNTHVID_VRAM_LOCATION_ACK = 4,
104 SYNTHVID_SITUATION_UPDATE = 5,
105 SYNTHVID_SITUATION_UPDATE_ACK = 6,
106 SYNTHVID_POINTER_POSITION = 7,
107 SYNTHVID_POINTER_SHAPE = 8,
108 SYNTHVID_FEATURE_CHANGE = 9,
109 SYNTHVID_DIRT = 10,
110 SYNTHVID_RESOLUTION_REQUEST = 13,
111 SYNTHVID_RESOLUTION_RESPONSE = 14,
112
113 SYNTHVID_MAX = 15
114 };
115
116 #define SYNTHVID_EDID_BLOCK_SIZE 128
117 #define SYNTHVID_MAX_RESOLUTION_COUNT 64
118
119 struct hvd_screen_info {
120 u16 width;
121 u16 height;
122 } __packed;
123
124 struct synthvid_msg_hdr {
125 u32 type;
126 u32 size; /* size of this header + payload after this field*/
127 } __packed;
128
129 struct synthvid_version_req {
130 u32 version;
131 } __packed;
132
133 struct synthvid_version_resp {
134 u32 version;
135 u8 is_accepted;
136 u8 max_video_outputs;
137 } __packed;
138
139 struct synthvid_supported_resolution_req {
140 u8 maximum_resolution_count;
141 } __packed;
142
143 struct synthvid_supported_resolution_resp {
144 u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE];
145 u8 resolution_count;
146 u8 default_resolution_index;
147 u8 is_standard;
148 struct hvd_screen_info
149 supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT];
150 } __packed;
151
152 struct synthvid_vram_location {
153 u64 user_ctx;
154 u8 is_vram_gpa_specified;
155 u64 vram_gpa;
156 } __packed;
157
158 struct synthvid_vram_location_ack {
159 u64 user_ctx;
160 } __packed;
161
162 struct video_output_situation {
163 u8 active;
164 u32 vram_offset;
165 u8 depth_bits;
166 u32 width_pixels;
167 u32 height_pixels;
168 u32 pitch_bytes;
169 } __packed;
170
171 struct synthvid_situation_update {
172 u64 user_ctx;
173 u8 video_output_count;
174 struct video_output_situation video_output[1];
175 } __packed;
176
177 struct synthvid_situation_update_ack {
178 u64 user_ctx;
179 } __packed;
180
181 struct synthvid_pointer_position {
182 u8 is_visible;
183 u8 video_output;
184 s32 image_x;
185 s32 image_y;
186 } __packed;
187
188
189 #define CURSOR_MAX_X 96
190 #define CURSOR_MAX_Y 96
191 #define CURSOR_ARGB_PIXEL_SIZE 4
192 #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE)
193 #define CURSOR_COMPLETE (-1)
194
195 struct synthvid_pointer_shape {
196 u8 part_idx;
197 u8 is_argb;
198 u32 width; /* CURSOR_MAX_X at most */
199 u32 height; /* CURSOR_MAX_Y at most */
200 u32 hot_x; /* hotspot relative to upper-left of pointer image */
201 u32 hot_y;
202 u8 data[4];
203 } __packed;
204
205 struct synthvid_feature_change {
206 u8 is_dirt_needed;
207 u8 is_ptr_pos_needed;
208 u8 is_ptr_shape_needed;
209 u8 is_situ_needed;
210 } __packed;
211
212 struct rect {
213 s32 x1, y1; /* top left corner */
214 s32 x2, y2; /* bottom right corner, exclusive */
215 } __packed;
216
217 struct synthvid_dirt {
218 u8 video_output;
219 u8 dirt_count;
220 struct rect rect[1];
221 } __packed;
222
223 struct synthvid_msg {
224 struct pipe_msg_hdr pipe_hdr;
225 struct synthvid_msg_hdr vid_hdr;
226 union {
227 struct synthvid_version_req ver_req;
228 struct synthvid_version_resp ver_resp;
229 struct synthvid_vram_location vram;
230 struct synthvid_vram_location_ack vram_ack;
231 struct synthvid_situation_update situ;
232 struct synthvid_situation_update_ack situ_ack;
233 struct synthvid_pointer_position ptr_pos;
234 struct synthvid_pointer_shape ptr_shape;
235 struct synthvid_feature_change feature_chg;
236 struct synthvid_dirt dirt;
237 struct synthvid_supported_resolution_req resolution_req;
238 struct synthvid_supported_resolution_resp resolution_resp;
239 };
240 } __packed;
241
242
243 /* FB driver definitions and structures */
244 #define HVFB_WIDTH 1152 /* default screen width */
245 #define HVFB_HEIGHT 864 /* default screen height */
246 #define HVFB_WIDTH_MIN 640
247 #define HVFB_HEIGHT_MIN 480
248
249 #define RING_BUFSIZE (256 * 1024)
250 #define VSP_TIMEOUT (10 * HZ)
251 #define HVFB_UPDATE_DELAY (HZ / 20)
252 #define HVFB_ONDEMAND_THROTTLE (HZ / 20)
253
254 struct hvfb_par {
255 struct fb_info *info;
256 struct resource *mem;
257 bool fb_ready; /* fb device is ready */
258 struct completion wait;
259 u32 synthvid_version;
260
261 struct delayed_work dwork;
262 bool update;
263 bool update_saved; /* The value of 'update' before hibernation */
264
265 u32 pseudo_palette[16];
266 u8 init_buf[MAX_VMBUS_PKT_SIZE];
267 u8 recv_buf[MAX_VMBUS_PKT_SIZE];
268
269 /* If true, the VSC notifies the VSP on every framebuffer change */
270 bool synchronous_fb;
271
272 /* If true, need to copy from deferred IO mem to framebuffer mem */
273 bool need_docopy;
274
275 struct notifier_block hvfb_panic_nb;
276
277 /* Memory for deferred IO and frame buffer itself */
278 unsigned char *dio_vp;
279 unsigned char *mmio_vp;
280 phys_addr_t mmio_pp;
281
282 /* Dirty rectangle, protected by delayed_refresh_lock */
283 int x1, y1, x2, y2;
284 bool delayed_refresh;
285 spinlock_t delayed_refresh_lock;
286 };
287
288 static uint screen_width = HVFB_WIDTH;
289 static uint screen_height = HVFB_HEIGHT;
290 static uint screen_depth;
291 static uint screen_fb_size;
292 static uint dio_fb_size; /* FB size for deferred IO */
293
294 /* Send message to Hyper-V host */
synthvid_send(struct hv_device * hdev,struct synthvid_msg * msg)295 static inline int synthvid_send(struct hv_device *hdev,
296 struct synthvid_msg *msg)
297 {
298 static atomic64_t request_id = ATOMIC64_INIT(0);
299 int ret;
300
301 msg->pipe_hdr.type = PIPE_MSG_DATA;
302 msg->pipe_hdr.size = msg->vid_hdr.size;
303
304 ret = vmbus_sendpacket(hdev->channel, msg,
305 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr),
306 atomic64_inc_return(&request_id),
307 VM_PKT_DATA_INBAND, 0);
308
309 if (ret)
310 pr_err_ratelimited("Unable to send packet via vmbus; error %d\n", ret);
311
312 return ret;
313 }
314
315
316 /* Send screen resolution info to host */
synthvid_send_situ(struct hv_device * hdev)317 static int synthvid_send_situ(struct hv_device *hdev)
318 {
319 struct fb_info *info = hv_get_drvdata(hdev);
320 struct synthvid_msg msg;
321
322 if (!info)
323 return -ENODEV;
324
325 memset(&msg, 0, sizeof(struct synthvid_msg));
326
327 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
328 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
329 sizeof(struct synthvid_situation_update);
330 msg.situ.user_ctx = 0;
331 msg.situ.video_output_count = 1;
332 msg.situ.video_output[0].active = 1;
333 msg.situ.video_output[0].vram_offset = 0;
334 msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel;
335 msg.situ.video_output[0].width_pixels = info->var.xres;
336 msg.situ.video_output[0].height_pixels = info->var.yres;
337 msg.situ.video_output[0].pitch_bytes = info->fix.line_length;
338
339 synthvid_send(hdev, &msg);
340
341 return 0;
342 }
343
344 /* Send mouse pointer info to host */
synthvid_send_ptr(struct hv_device * hdev)345 static int synthvid_send_ptr(struct hv_device *hdev)
346 {
347 struct synthvid_msg msg;
348
349 memset(&msg, 0, sizeof(struct synthvid_msg));
350 msg.vid_hdr.type = SYNTHVID_POINTER_POSITION;
351 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
352 sizeof(struct synthvid_pointer_position);
353 msg.ptr_pos.is_visible = 1;
354 msg.ptr_pos.video_output = 0;
355 msg.ptr_pos.image_x = 0;
356 msg.ptr_pos.image_y = 0;
357 synthvid_send(hdev, &msg);
358
359 memset(&msg, 0, sizeof(struct synthvid_msg));
360 msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE;
361 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
362 sizeof(struct synthvid_pointer_shape);
363 msg.ptr_shape.part_idx = CURSOR_COMPLETE;
364 msg.ptr_shape.is_argb = 1;
365 msg.ptr_shape.width = 1;
366 msg.ptr_shape.height = 1;
367 msg.ptr_shape.hot_x = 0;
368 msg.ptr_shape.hot_y = 0;
369 msg.ptr_shape.data[0] = 0;
370 msg.ptr_shape.data[1] = 1;
371 msg.ptr_shape.data[2] = 1;
372 msg.ptr_shape.data[3] = 1;
373 synthvid_send(hdev, &msg);
374
375 return 0;
376 }
377
378 /* Send updated screen area (dirty rectangle) location to host */
379 static int
synthvid_update(struct fb_info * info,int x1,int y1,int x2,int y2)380 synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2)
381 {
382 struct hv_device *hdev = device_to_hv_device(info->device);
383 struct synthvid_msg msg;
384
385 memset(&msg, 0, sizeof(struct synthvid_msg));
386 if (x2 == INT_MAX)
387 x2 = info->var.xres;
388 if (y2 == INT_MAX)
389 y2 = info->var.yres;
390
391 msg.vid_hdr.type = SYNTHVID_DIRT;
392 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
393 sizeof(struct synthvid_dirt);
394 msg.dirt.video_output = 0;
395 msg.dirt.dirt_count = 1;
396 msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1;
397 msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1;
398 msg.dirt.rect[0].x2 =
399 (x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2;
400 msg.dirt.rect[0].y2 =
401 (y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2;
402
403 synthvid_send(hdev, &msg);
404
405 return 0;
406 }
407
hvfb_docopy(struct hvfb_par * par,unsigned long offset,unsigned long size)408 static void hvfb_docopy(struct hvfb_par *par,
409 unsigned long offset,
410 unsigned long size)
411 {
412 if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready ||
413 size == 0 || offset >= dio_fb_size)
414 return;
415
416 if (offset + size > dio_fb_size)
417 size = dio_fb_size - offset;
418
419 memcpy(par->mmio_vp + offset, par->dio_vp + offset, size);
420 }
421
422 /* Deferred IO callback */
synthvid_deferred_io(struct fb_info * p,struct list_head * pagereflist)423 static void synthvid_deferred_io(struct fb_info *p, struct list_head *pagereflist)
424 {
425 struct hvfb_par *par = p->par;
426 struct fb_deferred_io_pageref *pageref;
427 unsigned long start, end;
428 int y1, y2, miny, maxy;
429
430 miny = INT_MAX;
431 maxy = 0;
432
433 /*
434 * Merge dirty pages. It is possible that last page cross
435 * over the end of frame buffer row yres. This is taken care of
436 * in synthvid_update function by clamping the y2
437 * value to yres.
438 */
439 list_for_each_entry(pageref, pagereflist, list) {
440 struct page *page = pageref->page;
441 start = page->index << PAGE_SHIFT;
442 end = start + PAGE_SIZE - 1;
443 y1 = start / p->fix.line_length;
444 y2 = end / p->fix.line_length;
445 miny = min_t(int, miny, y1);
446 maxy = max_t(int, maxy, y2);
447
448 /* Copy from dio space to mmio address */
449 if (par->fb_ready && par->need_docopy)
450 hvfb_docopy(par, start, PAGE_SIZE);
451 }
452
453 if (par->fb_ready && par->update)
454 synthvid_update(p, 0, miny, p->var.xres, maxy + 1);
455 }
456
457 static struct fb_deferred_io synthvid_defio = {
458 .delay = HZ / 20,
459 .deferred_io = synthvid_deferred_io,
460 };
461
462 /*
463 * Actions on received messages from host:
464 * Complete the wait event.
465 * Or, reply with screen and cursor info.
466 */
synthvid_recv_sub(struct hv_device * hdev)467 static void synthvid_recv_sub(struct hv_device *hdev)
468 {
469 struct fb_info *info = hv_get_drvdata(hdev);
470 struct hvfb_par *par;
471 struct synthvid_msg *msg;
472
473 if (!info)
474 return;
475
476 par = info->par;
477 msg = (struct synthvid_msg *)par->recv_buf;
478
479 /* Complete the wait event */
480 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
481 msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE ||
482 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
483 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE);
484 complete(&par->wait);
485 return;
486 }
487
488 /* Reply with screen and cursor info */
489 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) {
490 if (par->fb_ready) {
491 synthvid_send_ptr(hdev);
492 synthvid_send_situ(hdev);
493 }
494
495 par->update = msg->feature_chg.is_dirt_needed;
496 if (par->update)
497 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
498 }
499 }
500
501 /* Receive callback for messages from the host */
synthvid_receive(void * ctx)502 static void synthvid_receive(void *ctx)
503 {
504 struct hv_device *hdev = ctx;
505 struct fb_info *info = hv_get_drvdata(hdev);
506 struct hvfb_par *par;
507 struct synthvid_msg *recv_buf;
508 u32 bytes_recvd;
509 u64 req_id;
510 int ret;
511
512 if (!info)
513 return;
514
515 par = info->par;
516 recv_buf = (struct synthvid_msg *)par->recv_buf;
517
518 do {
519 ret = vmbus_recvpacket(hdev->channel, recv_buf,
520 MAX_VMBUS_PKT_SIZE,
521 &bytes_recvd, &req_id);
522 if (bytes_recvd > 0 &&
523 recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
524 synthvid_recv_sub(hdev);
525 } while (bytes_recvd > 0 && ret == 0);
526 }
527
528 /* Check if the ver1 version is equal or greater than ver2 */
synthvid_ver_ge(u32 ver1,u32 ver2)529 static inline bool synthvid_ver_ge(u32 ver1, u32 ver2)
530 {
531 if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) ||
532 (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) &&
533 SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2)))
534 return true;
535
536 return false;
537 }
538
539 /* Check synthetic video protocol version with the host */
synthvid_negotiate_ver(struct hv_device * hdev,u32 ver)540 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver)
541 {
542 struct fb_info *info = hv_get_drvdata(hdev);
543 struct hvfb_par *par = info->par;
544 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
545 int ret = 0;
546 unsigned long t;
547
548 memset(msg, 0, sizeof(struct synthvid_msg));
549 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
550 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
551 sizeof(struct synthvid_version_req);
552 msg->ver_req.version = ver;
553 synthvid_send(hdev, msg);
554
555 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
556 if (!t) {
557 pr_err("Time out on waiting version response\n");
558 ret = -ETIMEDOUT;
559 goto out;
560 }
561 if (!msg->ver_resp.is_accepted) {
562 ret = -ENODEV;
563 goto out;
564 }
565
566 par->synthvid_version = ver;
567 pr_info("Synthvid Version major %d, minor %d\n",
568 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver));
569
570 out:
571 return ret;
572 }
573
574 /* Get current resolution from the host */
synthvid_get_supported_resolution(struct hv_device * hdev)575 static int synthvid_get_supported_resolution(struct hv_device *hdev)
576 {
577 struct fb_info *info = hv_get_drvdata(hdev);
578 struct hvfb_par *par = info->par;
579 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
580 int ret = 0;
581 unsigned long t;
582 u8 index;
583
584 memset(msg, 0, sizeof(struct synthvid_msg));
585 msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST;
586 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
587 sizeof(struct synthvid_supported_resolution_req);
588
589 msg->resolution_req.maximum_resolution_count =
590 SYNTHVID_MAX_RESOLUTION_COUNT;
591 synthvid_send(hdev, msg);
592
593 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
594 if (!t) {
595 pr_err("Time out on waiting resolution response\n");
596 ret = -ETIMEDOUT;
597 goto out;
598 }
599
600 if (msg->resolution_resp.resolution_count == 0) {
601 pr_err("No supported resolutions\n");
602 ret = -ENODEV;
603 goto out;
604 }
605
606 index = msg->resolution_resp.default_resolution_index;
607 if (index >= msg->resolution_resp.resolution_count) {
608 pr_err("Invalid resolution index: %d\n", index);
609 ret = -ENODEV;
610 goto out;
611 }
612
613 screen_width =
614 msg->resolution_resp.supported_resolution[index].width;
615 screen_height =
616 msg->resolution_resp.supported_resolution[index].height;
617
618 out:
619 return ret;
620 }
621
622 /* Connect to VSP (Virtual Service Provider) on host */
synthvid_connect_vsp(struct hv_device * hdev)623 static int synthvid_connect_vsp(struct hv_device *hdev)
624 {
625 struct fb_info *info = hv_get_drvdata(hdev);
626 struct hvfb_par *par = info->par;
627 int ret;
628
629 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE,
630 NULL, 0, synthvid_receive, hdev);
631 if (ret) {
632 pr_err("Unable to open vmbus channel\n");
633 return ret;
634 }
635
636 /* Negotiate the protocol version with host */
637 switch (vmbus_proto_version) {
638 case VERSION_WIN10:
639 case VERSION_WIN10_V5:
640 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
641 if (!ret)
642 break;
643 fallthrough;
644 case VERSION_WIN8:
645 case VERSION_WIN8_1:
646 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8);
647 if (!ret)
648 break;
649 fallthrough;
650 case VERSION_WS2008:
651 case VERSION_WIN7:
652 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7);
653 break;
654 default:
655 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
656 break;
657 }
658
659 if (ret) {
660 pr_err("Synthetic video device version not accepted\n");
661 goto error;
662 }
663
664 if (par->synthvid_version == SYNTHVID_VERSION_WIN7)
665 screen_depth = SYNTHVID_DEPTH_WIN7;
666 else
667 screen_depth = SYNTHVID_DEPTH_WIN8;
668
669 if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) {
670 ret = synthvid_get_supported_resolution(hdev);
671 if (ret)
672 pr_info("Failed to get supported resolution from host, use default\n");
673 }
674
675 screen_fb_size = hdev->channel->offermsg.offer.
676 mmio_megabytes * 1024 * 1024;
677
678 return 0;
679
680 error:
681 vmbus_close(hdev->channel);
682 return ret;
683 }
684
685 /* Send VRAM and Situation messages to the host */
synthvid_send_config(struct hv_device * hdev)686 static int synthvid_send_config(struct hv_device *hdev)
687 {
688 struct fb_info *info = hv_get_drvdata(hdev);
689 struct hvfb_par *par = info->par;
690 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
691 int ret = 0;
692 unsigned long t;
693
694 /* Send VRAM location */
695 memset(msg, 0, sizeof(struct synthvid_msg));
696 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
697 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
698 sizeof(struct synthvid_vram_location);
699 msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp;
700 msg->vram.is_vram_gpa_specified = 1;
701 synthvid_send(hdev, msg);
702
703 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
704 if (!t) {
705 pr_err("Time out on waiting vram location ack\n");
706 ret = -ETIMEDOUT;
707 goto out;
708 }
709 if (msg->vram_ack.user_ctx != par->mmio_pp) {
710 pr_err("Unable to set VRAM location\n");
711 ret = -ENODEV;
712 goto out;
713 }
714
715 /* Send pointer and situation update */
716 synthvid_send_ptr(hdev);
717 synthvid_send_situ(hdev);
718
719 out:
720 return ret;
721 }
722
723
724 /*
725 * Delayed work callback:
726 * It is scheduled to call whenever update request is received and it has
727 * not been called in last HVFB_ONDEMAND_THROTTLE time interval.
728 */
hvfb_update_work(struct work_struct * w)729 static void hvfb_update_work(struct work_struct *w)
730 {
731 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work);
732 struct fb_info *info = par->info;
733 unsigned long flags;
734 int x1, x2, y1, y2;
735 int j;
736
737 spin_lock_irqsave(&par->delayed_refresh_lock, flags);
738 /* Reset the request flag */
739 par->delayed_refresh = false;
740
741 /* Store the dirty rectangle to local variables */
742 x1 = par->x1;
743 x2 = par->x2;
744 y1 = par->y1;
745 y2 = par->y2;
746
747 /* Clear dirty rectangle */
748 par->x1 = par->y1 = INT_MAX;
749 par->x2 = par->y2 = 0;
750
751 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
752
753 if (x1 > info->var.xres || x2 > info->var.xres ||
754 y1 > info->var.yres || y2 > info->var.yres || x2 <= x1)
755 return;
756
757 /* Copy the dirty rectangle to frame buffer memory */
758 if (par->need_docopy)
759 for (j = y1; j < y2; j++)
760 hvfb_docopy(par,
761 j * info->fix.line_length +
762 (x1 * screen_depth / 8),
763 (x2 - x1) * screen_depth / 8);
764
765 /* Refresh */
766 if (par->fb_ready && par->update)
767 synthvid_update(info, x1, y1, x2, y2);
768 }
769
770 /*
771 * Control the on-demand refresh frequency. It schedules a delayed
772 * screen update if it has not yet.
773 */
hvfb_ondemand_refresh_throttle(struct hvfb_par * par,int x1,int y1,int w,int h)774 static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par,
775 int x1, int y1, int w, int h)
776 {
777 unsigned long flags;
778 int x2 = x1 + w;
779 int y2 = y1 + h;
780
781 spin_lock_irqsave(&par->delayed_refresh_lock, flags);
782
783 /* Merge dirty rectangle */
784 par->x1 = min_t(int, par->x1, x1);
785 par->y1 = min_t(int, par->y1, y1);
786 par->x2 = max_t(int, par->x2, x2);
787 par->y2 = max_t(int, par->y2, y2);
788
789 /* Schedule a delayed screen update if not yet */
790 if (par->delayed_refresh == false) {
791 schedule_delayed_work(&par->dwork,
792 HVFB_ONDEMAND_THROTTLE);
793 par->delayed_refresh = true;
794 }
795
796 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
797 }
798
hvfb_on_panic(struct notifier_block * nb,unsigned long e,void * p)799 static int hvfb_on_panic(struct notifier_block *nb,
800 unsigned long e, void *p)
801 {
802 struct hv_device *hdev;
803 struct hvfb_par *par;
804 struct fb_info *info;
805
806 par = container_of(nb, struct hvfb_par, hvfb_panic_nb);
807 info = par->info;
808 hdev = device_to_hv_device(info->device);
809
810 if (hv_ringbuffer_spinlock_busy(hdev->channel))
811 return NOTIFY_DONE;
812
813 par->synchronous_fb = true;
814 if (par->need_docopy)
815 hvfb_docopy(par, 0, dio_fb_size);
816 synthvid_update(info, 0, 0, INT_MAX, INT_MAX);
817
818 return NOTIFY_DONE;
819 }
820
821 /* Framebuffer operation handlers */
822
hvfb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)823 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
824 {
825 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN ||
826 var->xres > screen_width || var->yres > screen_height ||
827 var->bits_per_pixel != screen_depth)
828 return -EINVAL;
829
830 var->xres_virtual = var->xres;
831 var->yres_virtual = var->yres;
832
833 return 0;
834 }
835
hvfb_set_par(struct fb_info * info)836 static int hvfb_set_par(struct fb_info *info)
837 {
838 struct hv_device *hdev = device_to_hv_device(info->device);
839
840 return synthvid_send_situ(hdev);
841 }
842
843
chan_to_field(u32 chan,struct fb_bitfield * bf)844 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf)
845 {
846 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
847 }
848
hvfb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)849 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green,
850 unsigned blue, unsigned transp, struct fb_info *info)
851 {
852 u32 *pal = info->pseudo_palette;
853
854 if (regno > 15)
855 return -EINVAL;
856
857 pal[regno] = chan_to_field(red, &info->var.red)
858 | chan_to_field(green, &info->var.green)
859 | chan_to_field(blue, &info->var.blue)
860 | chan_to_field(transp, &info->var.transp);
861
862 return 0;
863 }
864
hvfb_blank(int blank,struct fb_info * info)865 static int hvfb_blank(int blank, struct fb_info *info)
866 {
867 return 1; /* get fb_blank to set the colormap to all black */
868 }
869
hvfb_cfb_fillrect(struct fb_info * p,const struct fb_fillrect * rect)870 static void hvfb_cfb_fillrect(struct fb_info *p,
871 const struct fb_fillrect *rect)
872 {
873 struct hvfb_par *par = p->par;
874
875 cfb_fillrect(p, rect);
876 if (par->synchronous_fb)
877 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
878 else
879 hvfb_ondemand_refresh_throttle(par, rect->dx, rect->dy,
880 rect->width, rect->height);
881 }
882
hvfb_cfb_copyarea(struct fb_info * p,const struct fb_copyarea * area)883 static void hvfb_cfb_copyarea(struct fb_info *p,
884 const struct fb_copyarea *area)
885 {
886 struct hvfb_par *par = p->par;
887
888 cfb_copyarea(p, area);
889 if (par->synchronous_fb)
890 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
891 else
892 hvfb_ondemand_refresh_throttle(par, area->dx, area->dy,
893 area->width, area->height);
894 }
895
hvfb_cfb_imageblit(struct fb_info * p,const struct fb_image * image)896 static void hvfb_cfb_imageblit(struct fb_info *p,
897 const struct fb_image *image)
898 {
899 struct hvfb_par *par = p->par;
900
901 cfb_imageblit(p, image);
902 if (par->synchronous_fb)
903 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
904 else
905 hvfb_ondemand_refresh_throttle(par, image->dx, image->dy,
906 image->width, image->height);
907 }
908
909 static const struct fb_ops hvfb_ops = {
910 .owner = THIS_MODULE,
911 .fb_check_var = hvfb_check_var,
912 .fb_set_par = hvfb_set_par,
913 .fb_setcolreg = hvfb_setcolreg,
914 .fb_fillrect = hvfb_cfb_fillrect,
915 .fb_copyarea = hvfb_cfb_copyarea,
916 .fb_imageblit = hvfb_cfb_imageblit,
917 .fb_blank = hvfb_blank,
918 };
919
920
921 /* Get options from kernel paramenter "video=" */
hvfb_get_option(struct fb_info * info)922 static void hvfb_get_option(struct fb_info *info)
923 {
924 struct hvfb_par *par = info->par;
925 char *opt = NULL, *p;
926 uint x = 0, y = 0;
927
928 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt)
929 return;
930
931 p = strsep(&opt, "x");
932 if (!*p || kstrtouint(p, 0, &x) ||
933 !opt || !*opt || kstrtouint(opt, 0, &y)) {
934 pr_err("Screen option is invalid: skipped\n");
935 return;
936 }
937
938 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN ||
939 (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) &&
940 (x * y * screen_depth / 8 > screen_fb_size)) ||
941 (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
942 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) ||
943 (par->synthvid_version == SYNTHVID_VERSION_WIN7 &&
944 (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) {
945 pr_err("Screen resolution option is out of range: skipped\n");
946 return;
947 }
948
949 screen_width = x;
950 screen_height = y;
951 return;
952 }
953
954 /*
955 * Allocate enough contiguous physical memory.
956 * Return physical address if succeeded or -1 if failed.
957 */
hvfb_get_phymem(struct hv_device * hdev,unsigned int request_size)958 static phys_addr_t hvfb_get_phymem(struct hv_device *hdev,
959 unsigned int request_size)
960 {
961 struct page *page = NULL;
962 dma_addr_t dma_handle;
963 void *vmem;
964 phys_addr_t paddr = 0;
965 unsigned int order = get_order(request_size);
966
967 if (request_size == 0)
968 return -1;
969
970 if (order < MAX_ORDER) {
971 /* Call alloc_pages if the size is less than 2^MAX_ORDER */
972 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
973 if (!page)
974 return -1;
975
976 paddr = (page_to_pfn(page) << PAGE_SHIFT);
977 } else {
978 /* Allocate from CMA */
979 hdev->device.coherent_dma_mask = DMA_BIT_MASK(64);
980
981 vmem = dma_alloc_coherent(&hdev->device,
982 round_up(request_size, PAGE_SIZE),
983 &dma_handle,
984 GFP_KERNEL | __GFP_NOWARN);
985
986 if (!vmem)
987 return -1;
988
989 paddr = virt_to_phys(vmem);
990 }
991
992 return paddr;
993 }
994
995 /* Release contiguous physical memory */
hvfb_release_phymem(struct hv_device * hdev,phys_addr_t paddr,unsigned int size)996 static void hvfb_release_phymem(struct hv_device *hdev,
997 phys_addr_t paddr, unsigned int size)
998 {
999 unsigned int order = get_order(size);
1000
1001 if (order < MAX_ORDER)
1002 __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order);
1003 else
1004 dma_free_coherent(&hdev->device,
1005 round_up(size, PAGE_SIZE),
1006 phys_to_virt(paddr),
1007 paddr);
1008 }
1009
1010
1011 /* Get framebuffer memory from Hyper-V video pci space */
hvfb_getmem(struct hv_device * hdev,struct fb_info * info)1012 static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
1013 {
1014 struct hvfb_par *par = info->par;
1015 struct pci_dev *pdev = NULL;
1016 void __iomem *fb_virt;
1017 int gen2vm = efi_enabled(EFI_BOOT);
1018 phys_addr_t paddr;
1019 int ret;
1020
1021 info->apertures = alloc_apertures(1);
1022 if (!info->apertures)
1023 return -ENOMEM;
1024
1025 if (!gen2vm) {
1026 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
1027 PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
1028 if (!pdev) {
1029 pr_err("Unable to find PCI Hyper-V video\n");
1030 return -ENODEV;
1031 }
1032
1033 info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
1034 info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
1035
1036 /*
1037 * For Gen 1 VM, we can directly use the contiguous memory
1038 * from VM. If we succeed, deferred IO happens directly
1039 * on this allocated framebuffer memory, avoiding extra
1040 * memory copy.
1041 */
1042 paddr = hvfb_get_phymem(hdev, screen_fb_size);
1043 if (paddr != (phys_addr_t) -1) {
1044 par->mmio_pp = paddr;
1045 par->mmio_vp = par->dio_vp = __va(paddr);
1046
1047 info->fix.smem_start = paddr;
1048 info->fix.smem_len = screen_fb_size;
1049 info->screen_base = par->mmio_vp;
1050 info->screen_size = screen_fb_size;
1051
1052 par->need_docopy = false;
1053 goto getmem_done;
1054 }
1055 pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n");
1056 } else {
1057 info->apertures->ranges[0].base = screen_info.lfb_base;
1058 info->apertures->ranges[0].size = screen_info.lfb_size;
1059 }
1060
1061 /*
1062 * Cannot use the contiguous physical memory.
1063 * Allocate mmio space for framebuffer.
1064 */
1065 dio_fb_size =
1066 screen_width * screen_height * screen_depth / 8;
1067
1068 ret = vmbus_allocate_mmio(&par->mem, hdev, 0, -1,
1069 screen_fb_size, 0x100000, true);
1070 if (ret != 0) {
1071 pr_err("Unable to allocate framebuffer memory\n");
1072 goto err1;
1073 }
1074
1075 /*
1076 * Map the VRAM cacheable for performance. This is also required for
1077 * VM Connect to display properly for ARM64 Linux VM, as the host also
1078 * maps the VRAM cacheable.
1079 */
1080 fb_virt = ioremap_cache(par->mem->start, screen_fb_size);
1081 if (!fb_virt)
1082 goto err2;
1083
1084 /* Allocate memory for deferred IO */
1085 par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE));
1086 if (par->dio_vp == NULL)
1087 goto err3;
1088
1089 /* Physical address of FB device */
1090 par->mmio_pp = par->mem->start;
1091 /* Virtual address of FB device */
1092 par->mmio_vp = (unsigned char *) fb_virt;
1093
1094 info->fix.smem_start = par->mem->start;
1095 info->fix.smem_len = dio_fb_size;
1096 info->screen_base = par->dio_vp;
1097 info->screen_size = dio_fb_size;
1098
1099 getmem_done:
1100 remove_conflicting_framebuffers(info->apertures,
1101 KBUILD_MODNAME, false);
1102
1103 if (gen2vm) {
1104 /* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */
1105 screen_info.lfb_size = 0;
1106 screen_info.lfb_base = 0;
1107 screen_info.orig_video_isVGA = 0;
1108 } else {
1109 pci_dev_put(pdev);
1110 }
1111
1112 return 0;
1113
1114 err3:
1115 iounmap(fb_virt);
1116 err2:
1117 vmbus_free_mmio(par->mem->start, screen_fb_size);
1118 par->mem = NULL;
1119 err1:
1120 if (!gen2vm)
1121 pci_dev_put(pdev);
1122
1123 return -ENOMEM;
1124 }
1125
1126 /* Release the framebuffer */
hvfb_putmem(struct hv_device * hdev,struct fb_info * info)1127 static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info)
1128 {
1129 struct hvfb_par *par = info->par;
1130
1131 if (par->need_docopy) {
1132 vfree(par->dio_vp);
1133 iounmap(info->screen_base);
1134 vmbus_free_mmio(par->mem->start, screen_fb_size);
1135 } else {
1136 hvfb_release_phymem(hdev, info->fix.smem_start,
1137 screen_fb_size);
1138 }
1139
1140 par->mem = NULL;
1141 }
1142
1143
hvfb_probe(struct hv_device * hdev,const struct hv_vmbus_device_id * dev_id)1144 static int hvfb_probe(struct hv_device *hdev,
1145 const struct hv_vmbus_device_id *dev_id)
1146 {
1147 struct fb_info *info;
1148 struct hvfb_par *par;
1149 int ret;
1150
1151 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device);
1152 if (!info)
1153 return -ENOMEM;
1154
1155 par = info->par;
1156 par->info = info;
1157 par->fb_ready = false;
1158 par->need_docopy = true;
1159 init_completion(&par->wait);
1160 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
1161
1162 par->delayed_refresh = false;
1163 spin_lock_init(&par->delayed_refresh_lock);
1164 par->x1 = par->y1 = INT_MAX;
1165 par->x2 = par->y2 = 0;
1166
1167 /* Connect to VSP */
1168 hv_set_drvdata(hdev, info);
1169 ret = synthvid_connect_vsp(hdev);
1170 if (ret) {
1171 pr_err("Unable to connect to VSP\n");
1172 goto error1;
1173 }
1174
1175 hvfb_get_option(info);
1176 pr_info("Screen resolution: %dx%d, Color depth: %d, Frame buffer size: %d\n",
1177 screen_width, screen_height, screen_depth, screen_fb_size);
1178
1179 ret = hvfb_getmem(hdev, info);
1180 if (ret) {
1181 pr_err("No memory for framebuffer\n");
1182 goto error2;
1183 }
1184
1185 /* Set up fb_info */
1186 info->flags = FBINFO_DEFAULT;
1187
1188 info->var.xres_virtual = info->var.xres = screen_width;
1189 info->var.yres_virtual = info->var.yres = screen_height;
1190 info->var.bits_per_pixel = screen_depth;
1191
1192 if (info->var.bits_per_pixel == 16) {
1193 info->var.red = (struct fb_bitfield){11, 5, 0};
1194 info->var.green = (struct fb_bitfield){5, 6, 0};
1195 info->var.blue = (struct fb_bitfield){0, 5, 0};
1196 info->var.transp = (struct fb_bitfield){0, 0, 0};
1197 } else {
1198 info->var.red = (struct fb_bitfield){16, 8, 0};
1199 info->var.green = (struct fb_bitfield){8, 8, 0};
1200 info->var.blue = (struct fb_bitfield){0, 8, 0};
1201 info->var.transp = (struct fb_bitfield){24, 8, 0};
1202 }
1203
1204 info->var.activate = FB_ACTIVATE_NOW;
1205 info->var.height = -1;
1206 info->var.width = -1;
1207 info->var.vmode = FB_VMODE_NONINTERLACED;
1208
1209 strcpy(info->fix.id, KBUILD_MODNAME);
1210 info->fix.type = FB_TYPE_PACKED_PIXELS;
1211 info->fix.visual = FB_VISUAL_TRUECOLOR;
1212 info->fix.line_length = screen_width * screen_depth / 8;
1213 info->fix.accel = FB_ACCEL_NONE;
1214
1215 info->fbops = &hvfb_ops;
1216 info->pseudo_palette = par->pseudo_palette;
1217
1218 /* Initialize deferred IO */
1219 info->fbdefio = &synthvid_defio;
1220 fb_deferred_io_init(info);
1221
1222 /* Send config to host */
1223 ret = synthvid_send_config(hdev);
1224 if (ret)
1225 goto error;
1226
1227 ret = register_framebuffer(info);
1228 if (ret) {
1229 pr_err("Unable to register framebuffer\n");
1230 goto error;
1231 }
1232
1233 par->fb_ready = true;
1234
1235 par->synchronous_fb = false;
1236 par->hvfb_panic_nb.notifier_call = hvfb_on_panic;
1237 atomic_notifier_chain_register(&panic_notifier_list,
1238 &par->hvfb_panic_nb);
1239
1240 return 0;
1241
1242 error:
1243 fb_deferred_io_cleanup(info);
1244 hvfb_putmem(hdev, info);
1245 error2:
1246 vmbus_close(hdev->channel);
1247 error1:
1248 cancel_delayed_work_sync(&par->dwork);
1249 hv_set_drvdata(hdev, NULL);
1250 framebuffer_release(info);
1251 return ret;
1252 }
1253
1254
hvfb_remove(struct hv_device * hdev)1255 static int hvfb_remove(struct hv_device *hdev)
1256 {
1257 struct fb_info *info = hv_get_drvdata(hdev);
1258 struct hvfb_par *par = info->par;
1259
1260 atomic_notifier_chain_unregister(&panic_notifier_list,
1261 &par->hvfb_panic_nb);
1262
1263 par->update = false;
1264 par->fb_ready = false;
1265
1266 fb_deferred_io_cleanup(info);
1267
1268 unregister_framebuffer(info);
1269 cancel_delayed_work_sync(&par->dwork);
1270
1271 vmbus_close(hdev->channel);
1272 hv_set_drvdata(hdev, NULL);
1273
1274 hvfb_putmem(hdev, info);
1275 framebuffer_release(info);
1276
1277 return 0;
1278 }
1279
hvfb_suspend(struct hv_device * hdev)1280 static int hvfb_suspend(struct hv_device *hdev)
1281 {
1282 struct fb_info *info = hv_get_drvdata(hdev);
1283 struct hvfb_par *par = info->par;
1284
1285 console_lock();
1286
1287 /* 1 means do suspend */
1288 fb_set_suspend(info, 1);
1289
1290 cancel_delayed_work_sync(&par->dwork);
1291 cancel_delayed_work_sync(&info->deferred_work);
1292
1293 par->update_saved = par->update;
1294 par->update = false;
1295 par->fb_ready = false;
1296
1297 vmbus_close(hdev->channel);
1298
1299 console_unlock();
1300
1301 return 0;
1302 }
1303
hvfb_resume(struct hv_device * hdev)1304 static int hvfb_resume(struct hv_device *hdev)
1305 {
1306 struct fb_info *info = hv_get_drvdata(hdev);
1307 struct hvfb_par *par = info->par;
1308 int ret;
1309
1310 console_lock();
1311
1312 ret = synthvid_connect_vsp(hdev);
1313 if (ret != 0)
1314 goto out;
1315
1316 ret = synthvid_send_config(hdev);
1317 if (ret != 0) {
1318 vmbus_close(hdev->channel);
1319 goto out;
1320 }
1321
1322 par->fb_ready = true;
1323 par->update = par->update_saved;
1324
1325 schedule_delayed_work(&info->deferred_work, info->fbdefio->delay);
1326 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
1327
1328 /* 0 means do resume */
1329 fb_set_suspend(info, 0);
1330
1331 out:
1332 console_unlock();
1333
1334 return ret;
1335 }
1336
1337
1338 static const struct pci_device_id pci_stub_id_table[] = {
1339 {
1340 .vendor = PCI_VENDOR_ID_MICROSOFT,
1341 .device = PCI_DEVICE_ID_HYPERV_VIDEO,
1342 },
1343 { /* end of list */ }
1344 };
1345
1346 static const struct hv_vmbus_device_id id_table[] = {
1347 /* Synthetic Video Device GUID */
1348 {HV_SYNTHVID_GUID},
1349 {}
1350 };
1351
1352 MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
1353 MODULE_DEVICE_TABLE(vmbus, id_table);
1354
1355 static struct hv_driver hvfb_drv = {
1356 .name = KBUILD_MODNAME,
1357 .id_table = id_table,
1358 .probe = hvfb_probe,
1359 .remove = hvfb_remove,
1360 .suspend = hvfb_suspend,
1361 .resume = hvfb_resume,
1362 .driver = {
1363 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1364 },
1365 };
1366
hvfb_pci_stub_probe(struct pci_dev * pdev,const struct pci_device_id * ent)1367 static int hvfb_pci_stub_probe(struct pci_dev *pdev,
1368 const struct pci_device_id *ent)
1369 {
1370 return 0;
1371 }
1372
hvfb_pci_stub_remove(struct pci_dev * pdev)1373 static void hvfb_pci_stub_remove(struct pci_dev *pdev)
1374 {
1375 }
1376
1377 static struct pci_driver hvfb_pci_stub_driver = {
1378 .name = KBUILD_MODNAME,
1379 .id_table = pci_stub_id_table,
1380 .probe = hvfb_pci_stub_probe,
1381 .remove = hvfb_pci_stub_remove,
1382 .driver = {
1383 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1384 }
1385 };
1386
hvfb_drv_init(void)1387 static int __init hvfb_drv_init(void)
1388 {
1389 int ret;
1390
1391 ret = vmbus_driver_register(&hvfb_drv);
1392 if (ret != 0)
1393 return ret;
1394
1395 ret = pci_register_driver(&hvfb_pci_stub_driver);
1396 if (ret != 0) {
1397 vmbus_driver_unregister(&hvfb_drv);
1398 return ret;
1399 }
1400
1401 return 0;
1402 }
1403
hvfb_drv_exit(void)1404 static void __exit hvfb_drv_exit(void)
1405 {
1406 pci_unregister_driver(&hvfb_pci_stub_driver);
1407 vmbus_driver_unregister(&hvfb_drv);
1408 }
1409
1410 module_init(hvfb_drv_init);
1411 module_exit(hvfb_drv_exit);
1412
1413 MODULE_LICENSE("GPL");
1414 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver");
1415