1 /*
2 * Copyright (c) 2012, Microsoft Corporation.
3 *
4 * Author:
5 * Haiyang Zhang <haiyangz@microsoft.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
14 * NON INFRINGEMENT. See the GNU General Public License for more
15 * details.
16 */
17
18 /*
19 * Hyper-V Synthetic Video Frame Buffer Driver
20 *
21 * This is the driver for the Hyper-V Synthetic Video, which supports
22 * screen resolution up to Full HD 1920x1080 with 32 bit color on Windows
23 * Server 2012, and 1600x1200 with 16 bit color on Windows Server 2008 R2
24 * or earlier.
25 *
26 * It also solves the double mouse cursor issue of the emulated video mode.
27 *
28 * The default screen resolution is 1152x864, which may be changed by a
29 * kernel parameter:
30 * video=hyperv_fb:<width>x<height>
31 * For example: video=hyperv_fb:1280x1024
32 *
33 * Portrait orientation is also supported:
34 * For example: video=hyperv_fb:864x1152
35 */
36
37 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
38
39 #include <linux/module.h>
40 #include <linux/kernel.h>
41 #include <linux/init.h>
42 #include <linux/completion.h>
43 #include <linux/fb.h>
44 #include <linux/pci.h>
45 #include <linux/efi.h>
46
47 #include <linux/hyperv.h>
48
49
50 /* Hyper-V Synthetic Video Protocol definitions and structures */
51 #define MAX_VMBUS_PKT_SIZE 0x4000
52
53 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
54 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
55 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
56
57 #define SYNTHVID_DEPTH_WIN7 16
58 #define SYNTHVID_DEPTH_WIN8 32
59
60 #define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024)
61 #define SYNTHVID_WIDTH_MAX_WIN7 1600
62 #define SYNTHVID_HEIGHT_MAX_WIN7 1200
63
64 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
65
66 #define PCI_VENDOR_ID_MICROSOFT 0x1414
67 #define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353
68
69
70 enum pipe_msg_type {
71 PIPE_MSG_INVALID,
72 PIPE_MSG_DATA,
73 PIPE_MSG_MAX
74 };
75
76 struct pipe_msg_hdr {
77 u32 type;
78 u32 size; /* size of message after this field */
79 } __packed;
80
81
82 enum synthvid_msg_type {
83 SYNTHVID_ERROR = 0,
84 SYNTHVID_VERSION_REQUEST = 1,
85 SYNTHVID_VERSION_RESPONSE = 2,
86 SYNTHVID_VRAM_LOCATION = 3,
87 SYNTHVID_VRAM_LOCATION_ACK = 4,
88 SYNTHVID_SITUATION_UPDATE = 5,
89 SYNTHVID_SITUATION_UPDATE_ACK = 6,
90 SYNTHVID_POINTER_POSITION = 7,
91 SYNTHVID_POINTER_SHAPE = 8,
92 SYNTHVID_FEATURE_CHANGE = 9,
93 SYNTHVID_DIRT = 10,
94
95 SYNTHVID_MAX = 11
96 };
97
98 struct synthvid_msg_hdr {
99 u32 type;
100 u32 size; /* size of this header + payload after this field*/
101 } __packed;
102
103
104 struct synthvid_version_req {
105 u32 version;
106 } __packed;
107
108 struct synthvid_version_resp {
109 u32 version;
110 u8 is_accepted;
111 u8 max_video_outputs;
112 } __packed;
113
114 struct synthvid_vram_location {
115 u64 user_ctx;
116 u8 is_vram_gpa_specified;
117 u64 vram_gpa;
118 } __packed;
119
120 struct synthvid_vram_location_ack {
121 u64 user_ctx;
122 } __packed;
123
124 struct video_output_situation {
125 u8 active;
126 u32 vram_offset;
127 u8 depth_bits;
128 u32 width_pixels;
129 u32 height_pixels;
130 u32 pitch_bytes;
131 } __packed;
132
133 struct synthvid_situation_update {
134 u64 user_ctx;
135 u8 video_output_count;
136 struct video_output_situation video_output[1];
137 } __packed;
138
139 struct synthvid_situation_update_ack {
140 u64 user_ctx;
141 } __packed;
142
143 struct synthvid_pointer_position {
144 u8 is_visible;
145 u8 video_output;
146 s32 image_x;
147 s32 image_y;
148 } __packed;
149
150
151 #define CURSOR_MAX_X 96
152 #define CURSOR_MAX_Y 96
153 #define CURSOR_ARGB_PIXEL_SIZE 4
154 #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE)
155 #define CURSOR_COMPLETE (-1)
156
157 struct synthvid_pointer_shape {
158 u8 part_idx;
159 u8 is_argb;
160 u32 width; /* CURSOR_MAX_X at most */
161 u32 height; /* CURSOR_MAX_Y at most */
162 u32 hot_x; /* hotspot relative to upper-left of pointer image */
163 u32 hot_y;
164 u8 data[4];
165 } __packed;
166
167 struct synthvid_feature_change {
168 u8 is_dirt_needed;
169 u8 is_ptr_pos_needed;
170 u8 is_ptr_shape_needed;
171 u8 is_situ_needed;
172 } __packed;
173
174 struct rect {
175 s32 x1, y1; /* top left corner */
176 s32 x2, y2; /* bottom right corner, exclusive */
177 } __packed;
178
179 struct synthvid_dirt {
180 u8 video_output;
181 u8 dirt_count;
182 struct rect rect[1];
183 } __packed;
184
185 struct synthvid_msg {
186 struct pipe_msg_hdr pipe_hdr;
187 struct synthvid_msg_hdr vid_hdr;
188 union {
189 struct synthvid_version_req ver_req;
190 struct synthvid_version_resp ver_resp;
191 struct synthvid_vram_location vram;
192 struct synthvid_vram_location_ack vram_ack;
193 struct synthvid_situation_update situ;
194 struct synthvid_situation_update_ack situ_ack;
195 struct synthvid_pointer_position ptr_pos;
196 struct synthvid_pointer_shape ptr_shape;
197 struct synthvid_feature_change feature_chg;
198 struct synthvid_dirt dirt;
199 };
200 } __packed;
201
202
203
204 /* FB driver definitions and structures */
205 #define HVFB_WIDTH 1152 /* default screen width */
206 #define HVFB_HEIGHT 864 /* default screen height */
207 #define HVFB_WIDTH_MIN 640
208 #define HVFB_HEIGHT_MIN 480
209
210 #define RING_BUFSIZE (256 * 1024)
211 #define VSP_TIMEOUT (10 * HZ)
212 #define HVFB_UPDATE_DELAY (HZ / 20)
213
214 struct hvfb_par {
215 struct fb_info *info;
216 struct resource *mem;
217 bool fb_ready; /* fb device is ready */
218 struct completion wait;
219 u32 synthvid_version;
220
221 struct delayed_work dwork;
222 bool update;
223
224 u32 pseudo_palette[16];
225 u8 init_buf[MAX_VMBUS_PKT_SIZE];
226 u8 recv_buf[MAX_VMBUS_PKT_SIZE];
227
228 /* If true, the VSC notifies the VSP on every framebuffer change */
229 bool synchronous_fb;
230
231 struct notifier_block hvfb_panic_nb;
232 };
233
234 static uint screen_width = HVFB_WIDTH;
235 static uint screen_height = HVFB_HEIGHT;
236 static uint screen_depth;
237 static uint screen_fb_size;
238
239 /* Send message to Hyper-V host */
synthvid_send(struct hv_device * hdev,struct synthvid_msg * msg)240 static inline int synthvid_send(struct hv_device *hdev,
241 struct synthvid_msg *msg)
242 {
243 static atomic64_t request_id = ATOMIC64_INIT(0);
244 int ret;
245
246 msg->pipe_hdr.type = PIPE_MSG_DATA;
247 msg->pipe_hdr.size = msg->vid_hdr.size;
248
249 ret = vmbus_sendpacket(hdev->channel, msg,
250 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr),
251 atomic64_inc_return(&request_id),
252 VM_PKT_DATA_INBAND, 0);
253
254 if (ret)
255 pr_err("Unable to send packet via vmbus\n");
256
257 return ret;
258 }
259
260
261 /* Send screen resolution info to host */
synthvid_send_situ(struct hv_device * hdev)262 static int synthvid_send_situ(struct hv_device *hdev)
263 {
264 struct fb_info *info = hv_get_drvdata(hdev);
265 struct synthvid_msg msg;
266
267 if (!info)
268 return -ENODEV;
269
270 memset(&msg, 0, sizeof(struct synthvid_msg));
271
272 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
273 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
274 sizeof(struct synthvid_situation_update);
275 msg.situ.user_ctx = 0;
276 msg.situ.video_output_count = 1;
277 msg.situ.video_output[0].active = 1;
278 msg.situ.video_output[0].vram_offset = 0;
279 msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel;
280 msg.situ.video_output[0].width_pixels = info->var.xres;
281 msg.situ.video_output[0].height_pixels = info->var.yres;
282 msg.situ.video_output[0].pitch_bytes = info->fix.line_length;
283
284 synthvid_send(hdev, &msg);
285
286 return 0;
287 }
288
289 /* Send mouse pointer info to host */
synthvid_send_ptr(struct hv_device * hdev)290 static int synthvid_send_ptr(struct hv_device *hdev)
291 {
292 struct synthvid_msg msg;
293
294 memset(&msg, 0, sizeof(struct synthvid_msg));
295 msg.vid_hdr.type = SYNTHVID_POINTER_POSITION;
296 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
297 sizeof(struct synthvid_pointer_position);
298 msg.ptr_pos.is_visible = 1;
299 msg.ptr_pos.video_output = 0;
300 msg.ptr_pos.image_x = 0;
301 msg.ptr_pos.image_y = 0;
302 synthvid_send(hdev, &msg);
303
304 memset(&msg, 0, sizeof(struct synthvid_msg));
305 msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE;
306 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
307 sizeof(struct synthvid_pointer_shape);
308 msg.ptr_shape.part_idx = CURSOR_COMPLETE;
309 msg.ptr_shape.is_argb = 1;
310 msg.ptr_shape.width = 1;
311 msg.ptr_shape.height = 1;
312 msg.ptr_shape.hot_x = 0;
313 msg.ptr_shape.hot_y = 0;
314 msg.ptr_shape.data[0] = 0;
315 msg.ptr_shape.data[1] = 1;
316 msg.ptr_shape.data[2] = 1;
317 msg.ptr_shape.data[3] = 1;
318 synthvid_send(hdev, &msg);
319
320 return 0;
321 }
322
323 /* Send updated screen area (dirty rectangle) location to host */
synthvid_update(struct fb_info * info)324 static int synthvid_update(struct fb_info *info)
325 {
326 struct hv_device *hdev = device_to_hv_device(info->device);
327 struct synthvid_msg msg;
328
329 memset(&msg, 0, sizeof(struct synthvid_msg));
330
331 msg.vid_hdr.type = SYNTHVID_DIRT;
332 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
333 sizeof(struct synthvid_dirt);
334 msg.dirt.video_output = 0;
335 msg.dirt.dirt_count = 1;
336 msg.dirt.rect[0].x1 = 0;
337 msg.dirt.rect[0].y1 = 0;
338 msg.dirt.rect[0].x2 = info->var.xres;
339 msg.dirt.rect[0].y2 = info->var.yres;
340
341 synthvid_send(hdev, &msg);
342
343 return 0;
344 }
345
346
347 /*
348 * Actions on received messages from host:
349 * Complete the wait event.
350 * Or, reply with screen and cursor info.
351 */
synthvid_recv_sub(struct hv_device * hdev)352 static void synthvid_recv_sub(struct hv_device *hdev)
353 {
354 struct fb_info *info = hv_get_drvdata(hdev);
355 struct hvfb_par *par;
356 struct synthvid_msg *msg;
357
358 if (!info)
359 return;
360
361 par = info->par;
362 msg = (struct synthvid_msg *)par->recv_buf;
363
364 /* Complete the wait event */
365 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
366 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
367 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE);
368 complete(&par->wait);
369 return;
370 }
371
372 /* Reply with screen and cursor info */
373 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) {
374 if (par->fb_ready) {
375 synthvid_send_ptr(hdev);
376 synthvid_send_situ(hdev);
377 }
378
379 par->update = msg->feature_chg.is_dirt_needed;
380 if (par->update)
381 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
382 }
383 }
384
385 /* Receive callback for messages from the host */
synthvid_receive(void * ctx)386 static void synthvid_receive(void *ctx)
387 {
388 struct hv_device *hdev = ctx;
389 struct fb_info *info = hv_get_drvdata(hdev);
390 struct hvfb_par *par;
391 struct synthvid_msg *recv_buf;
392 u32 bytes_recvd;
393 u64 req_id;
394 int ret;
395
396 if (!info)
397 return;
398
399 par = info->par;
400 recv_buf = (struct synthvid_msg *)par->recv_buf;
401
402 do {
403 ret = vmbus_recvpacket(hdev->channel, recv_buf,
404 MAX_VMBUS_PKT_SIZE,
405 &bytes_recvd, &req_id);
406 if (bytes_recvd > 0 &&
407 recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
408 synthvid_recv_sub(hdev);
409 } while (bytes_recvd > 0 && ret == 0);
410 }
411
412 /* Check synthetic video protocol version with the host */
synthvid_negotiate_ver(struct hv_device * hdev,u32 ver)413 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver)
414 {
415 struct fb_info *info = hv_get_drvdata(hdev);
416 struct hvfb_par *par = info->par;
417 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
418 int ret = 0;
419 unsigned long t;
420
421 memset(msg, 0, sizeof(struct synthvid_msg));
422 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
423 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
424 sizeof(struct synthvid_version_req);
425 msg->ver_req.version = ver;
426 synthvid_send(hdev, msg);
427
428 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
429 if (!t) {
430 pr_err("Time out on waiting version response\n");
431 ret = -ETIMEDOUT;
432 goto out;
433 }
434 if (!msg->ver_resp.is_accepted) {
435 ret = -ENODEV;
436 goto out;
437 }
438
439 par->synthvid_version = ver;
440
441 out:
442 return ret;
443 }
444
445 /* Connect to VSP (Virtual Service Provider) on host */
synthvid_connect_vsp(struct hv_device * hdev)446 static int synthvid_connect_vsp(struct hv_device *hdev)
447 {
448 struct fb_info *info = hv_get_drvdata(hdev);
449 struct hvfb_par *par = info->par;
450 int ret;
451
452 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE,
453 NULL, 0, synthvid_receive, hdev);
454 if (ret) {
455 pr_err("Unable to open vmbus channel\n");
456 return ret;
457 }
458
459 /* Negotiate the protocol version with host */
460 if (vmbus_proto_version == VERSION_WS2008 ||
461 vmbus_proto_version == VERSION_WIN7)
462 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7);
463 else
464 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8);
465
466 if (ret) {
467 pr_err("Synthetic video device version not accepted\n");
468 goto error;
469 }
470
471 if (par->synthvid_version == SYNTHVID_VERSION_WIN7)
472 screen_depth = SYNTHVID_DEPTH_WIN7;
473 else
474 screen_depth = SYNTHVID_DEPTH_WIN8;
475
476 screen_fb_size = hdev->channel->offermsg.offer.
477 mmio_megabytes * 1024 * 1024;
478
479 return 0;
480
481 error:
482 vmbus_close(hdev->channel);
483 return ret;
484 }
485
486 /* Send VRAM and Situation messages to the host */
synthvid_send_config(struct hv_device * hdev)487 static int synthvid_send_config(struct hv_device *hdev)
488 {
489 struct fb_info *info = hv_get_drvdata(hdev);
490 struct hvfb_par *par = info->par;
491 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
492 int ret = 0;
493 unsigned long t;
494
495 /* Send VRAM location */
496 memset(msg, 0, sizeof(struct synthvid_msg));
497 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
498 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
499 sizeof(struct synthvid_vram_location);
500 msg->vram.user_ctx = msg->vram.vram_gpa = info->fix.smem_start;
501 msg->vram.is_vram_gpa_specified = 1;
502 synthvid_send(hdev, msg);
503
504 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
505 if (!t) {
506 pr_err("Time out on waiting vram location ack\n");
507 ret = -ETIMEDOUT;
508 goto out;
509 }
510 if (msg->vram_ack.user_ctx != info->fix.smem_start) {
511 pr_err("Unable to set VRAM location\n");
512 ret = -ENODEV;
513 goto out;
514 }
515
516 /* Send pointer and situation update */
517 synthvid_send_ptr(hdev);
518 synthvid_send_situ(hdev);
519
520 out:
521 return ret;
522 }
523
524
525 /*
526 * Delayed work callback:
527 * It is called at HVFB_UPDATE_DELAY or longer time interval to process
528 * screen updates. It is re-scheduled if further update is necessary.
529 */
hvfb_update_work(struct work_struct * w)530 static void hvfb_update_work(struct work_struct *w)
531 {
532 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work);
533 struct fb_info *info = par->info;
534
535 if (par->fb_ready)
536 synthvid_update(info);
537
538 if (par->update)
539 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
540 }
541
hvfb_on_panic(struct notifier_block * nb,unsigned long e,void * p)542 static int hvfb_on_panic(struct notifier_block *nb,
543 unsigned long e, void *p)
544 {
545 struct hvfb_par *par;
546 struct fb_info *info;
547
548 par = container_of(nb, struct hvfb_par, hvfb_panic_nb);
549 par->synchronous_fb = true;
550 info = par->info;
551 synthvid_update(info);
552
553 return NOTIFY_DONE;
554 }
555
556 /* Framebuffer operation handlers */
557
hvfb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)558 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
559 {
560 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN ||
561 var->xres > screen_width || var->yres > screen_height ||
562 var->bits_per_pixel != screen_depth)
563 return -EINVAL;
564
565 var->xres_virtual = var->xres;
566 var->yres_virtual = var->yres;
567
568 return 0;
569 }
570
hvfb_set_par(struct fb_info * info)571 static int hvfb_set_par(struct fb_info *info)
572 {
573 struct hv_device *hdev = device_to_hv_device(info->device);
574
575 return synthvid_send_situ(hdev);
576 }
577
578
chan_to_field(u32 chan,struct fb_bitfield * bf)579 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf)
580 {
581 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
582 }
583
hvfb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)584 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green,
585 unsigned blue, unsigned transp, struct fb_info *info)
586 {
587 u32 *pal = info->pseudo_palette;
588
589 if (regno > 15)
590 return -EINVAL;
591
592 pal[regno] = chan_to_field(red, &info->var.red)
593 | chan_to_field(green, &info->var.green)
594 | chan_to_field(blue, &info->var.blue)
595 | chan_to_field(transp, &info->var.transp);
596
597 return 0;
598 }
599
hvfb_blank(int blank,struct fb_info * info)600 static int hvfb_blank(int blank, struct fb_info *info)
601 {
602 return 1; /* get fb_blank to set the colormap to all black */
603 }
604
hvfb_cfb_fillrect(struct fb_info * p,const struct fb_fillrect * rect)605 static void hvfb_cfb_fillrect(struct fb_info *p,
606 const struct fb_fillrect *rect)
607 {
608 struct hvfb_par *par = p->par;
609
610 cfb_fillrect(p, rect);
611 if (par->synchronous_fb)
612 synthvid_update(p);
613 }
614
hvfb_cfb_copyarea(struct fb_info * p,const struct fb_copyarea * area)615 static void hvfb_cfb_copyarea(struct fb_info *p,
616 const struct fb_copyarea *area)
617 {
618 struct hvfb_par *par = p->par;
619
620 cfb_copyarea(p, area);
621 if (par->synchronous_fb)
622 synthvid_update(p);
623 }
624
hvfb_cfb_imageblit(struct fb_info * p,const struct fb_image * image)625 static void hvfb_cfb_imageblit(struct fb_info *p,
626 const struct fb_image *image)
627 {
628 struct hvfb_par *par = p->par;
629
630 cfb_imageblit(p, image);
631 if (par->synchronous_fb)
632 synthvid_update(p);
633 }
634
635 static struct fb_ops hvfb_ops = {
636 .owner = THIS_MODULE,
637 .fb_check_var = hvfb_check_var,
638 .fb_set_par = hvfb_set_par,
639 .fb_setcolreg = hvfb_setcolreg,
640 .fb_fillrect = hvfb_cfb_fillrect,
641 .fb_copyarea = hvfb_cfb_copyarea,
642 .fb_imageblit = hvfb_cfb_imageblit,
643 .fb_blank = hvfb_blank,
644 };
645
646
647 /* Get options from kernel paramenter "video=" */
hvfb_get_option(struct fb_info * info)648 static void hvfb_get_option(struct fb_info *info)
649 {
650 struct hvfb_par *par = info->par;
651 char *opt = NULL, *p;
652 uint x = 0, y = 0;
653
654 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt)
655 return;
656
657 p = strsep(&opt, "x");
658 if (!*p || kstrtouint(p, 0, &x) ||
659 !opt || !*opt || kstrtouint(opt, 0, &y)) {
660 pr_err("Screen option is invalid: skipped\n");
661 return;
662 }
663
664 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN ||
665 (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
666 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) ||
667 (par->synthvid_version == SYNTHVID_VERSION_WIN7 &&
668 (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) {
669 pr_err("Screen resolution option is out of range: skipped\n");
670 return;
671 }
672
673 screen_width = x;
674 screen_height = y;
675 return;
676 }
677
678
679 /* Get framebuffer memory from Hyper-V video pci space */
hvfb_getmem(struct hv_device * hdev,struct fb_info * info)680 static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
681 {
682 struct hvfb_par *par = info->par;
683 struct pci_dev *pdev = NULL;
684 void __iomem *fb_virt;
685 int gen2vm = efi_enabled(EFI_BOOT);
686 resource_size_t pot_start, pot_end;
687 int ret;
688
689 if (gen2vm) {
690 pot_start = 0;
691 pot_end = -1;
692 } else {
693 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
694 PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
695 if (!pdev) {
696 pr_err("Unable to find PCI Hyper-V video\n");
697 return -ENODEV;
698 }
699
700 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) ||
701 pci_resource_len(pdev, 0) < screen_fb_size)
702 goto err1;
703
704 pot_end = pci_resource_end(pdev, 0);
705 pot_start = pot_end - screen_fb_size + 1;
706 }
707
708 ret = vmbus_allocate_mmio(&par->mem, hdev, pot_start, pot_end,
709 screen_fb_size, 0x100000, true);
710 if (ret != 0) {
711 pr_err("Unable to allocate framebuffer memory\n");
712 goto err1;
713 }
714
715 fb_virt = ioremap(par->mem->start, screen_fb_size);
716 if (!fb_virt)
717 goto err2;
718
719 info->apertures = alloc_apertures(1);
720 if (!info->apertures)
721 goto err3;
722
723 if (gen2vm) {
724 info->apertures->ranges[0].base = screen_info.lfb_base;
725 info->apertures->ranges[0].size = screen_info.lfb_size;
726 remove_conflicting_framebuffers(info->apertures,
727 KBUILD_MODNAME, false);
728 } else {
729 info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
730 info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
731 }
732
733 info->fix.smem_start = par->mem->start;
734 info->fix.smem_len = screen_fb_size;
735 info->screen_base = fb_virt;
736 info->screen_size = screen_fb_size;
737
738 if (!gen2vm)
739 pci_dev_put(pdev);
740
741 return 0;
742
743 err3:
744 iounmap(fb_virt);
745 err2:
746 vmbus_free_mmio(par->mem->start, screen_fb_size);
747 par->mem = NULL;
748 err1:
749 if (!gen2vm)
750 pci_dev_put(pdev);
751
752 return -ENOMEM;
753 }
754
755 /* Release the framebuffer */
hvfb_putmem(struct fb_info * info)756 static void hvfb_putmem(struct fb_info *info)
757 {
758 struct hvfb_par *par = info->par;
759
760 iounmap(info->screen_base);
761 vmbus_free_mmio(par->mem->start, screen_fb_size);
762 par->mem = NULL;
763 }
764
765
hvfb_probe(struct hv_device * hdev,const struct hv_vmbus_device_id * dev_id)766 static int hvfb_probe(struct hv_device *hdev,
767 const struct hv_vmbus_device_id *dev_id)
768 {
769 struct fb_info *info;
770 struct hvfb_par *par;
771 int ret;
772
773 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device);
774 if (!info) {
775 pr_err("No memory for framebuffer info\n");
776 return -ENOMEM;
777 }
778
779 par = info->par;
780 par->info = info;
781 par->fb_ready = false;
782 init_completion(&par->wait);
783 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
784
785 /* Connect to VSP */
786 hv_set_drvdata(hdev, info);
787 ret = synthvid_connect_vsp(hdev);
788 if (ret) {
789 pr_err("Unable to connect to VSP\n");
790 goto error1;
791 }
792
793 ret = hvfb_getmem(hdev, info);
794 if (ret) {
795 pr_err("No memory for framebuffer\n");
796 goto error2;
797 }
798
799 hvfb_get_option(info);
800 pr_info("Screen resolution: %dx%d, Color depth: %d\n",
801 screen_width, screen_height, screen_depth);
802
803
804 /* Set up fb_info */
805 info->flags = FBINFO_DEFAULT;
806
807 info->var.xres_virtual = info->var.xres = screen_width;
808 info->var.yres_virtual = info->var.yres = screen_height;
809 info->var.bits_per_pixel = screen_depth;
810
811 if (info->var.bits_per_pixel == 16) {
812 info->var.red = (struct fb_bitfield){11, 5, 0};
813 info->var.green = (struct fb_bitfield){5, 6, 0};
814 info->var.blue = (struct fb_bitfield){0, 5, 0};
815 info->var.transp = (struct fb_bitfield){0, 0, 0};
816 } else {
817 info->var.red = (struct fb_bitfield){16, 8, 0};
818 info->var.green = (struct fb_bitfield){8, 8, 0};
819 info->var.blue = (struct fb_bitfield){0, 8, 0};
820 info->var.transp = (struct fb_bitfield){24, 8, 0};
821 }
822
823 info->var.activate = FB_ACTIVATE_NOW;
824 info->var.height = -1;
825 info->var.width = -1;
826 info->var.vmode = FB_VMODE_NONINTERLACED;
827
828 strcpy(info->fix.id, KBUILD_MODNAME);
829 info->fix.type = FB_TYPE_PACKED_PIXELS;
830 info->fix.visual = FB_VISUAL_TRUECOLOR;
831 info->fix.line_length = screen_width * screen_depth / 8;
832 info->fix.accel = FB_ACCEL_NONE;
833
834 info->fbops = &hvfb_ops;
835 info->pseudo_palette = par->pseudo_palette;
836
837 /* Send config to host */
838 ret = synthvid_send_config(hdev);
839 if (ret)
840 goto error;
841
842 ret = register_framebuffer(info);
843 if (ret) {
844 pr_err("Unable to register framebuffer\n");
845 goto error;
846 }
847
848 par->fb_ready = true;
849
850 par->synchronous_fb = false;
851 par->hvfb_panic_nb.notifier_call = hvfb_on_panic;
852 atomic_notifier_chain_register(&panic_notifier_list,
853 &par->hvfb_panic_nb);
854
855 return 0;
856
857 error:
858 hvfb_putmem(info);
859 error2:
860 vmbus_close(hdev->channel);
861 error1:
862 cancel_delayed_work_sync(&par->dwork);
863 hv_set_drvdata(hdev, NULL);
864 framebuffer_release(info);
865 return ret;
866 }
867
868
hvfb_remove(struct hv_device * hdev)869 static int hvfb_remove(struct hv_device *hdev)
870 {
871 struct fb_info *info = hv_get_drvdata(hdev);
872 struct hvfb_par *par = info->par;
873
874 atomic_notifier_chain_unregister(&panic_notifier_list,
875 &par->hvfb_panic_nb);
876
877 par->update = false;
878 par->fb_ready = false;
879
880 unregister_framebuffer(info);
881 cancel_delayed_work_sync(&par->dwork);
882
883 vmbus_close(hdev->channel);
884 hv_set_drvdata(hdev, NULL);
885
886 hvfb_putmem(info);
887 framebuffer_release(info);
888
889 return 0;
890 }
891
892
893 static const struct pci_device_id pci_stub_id_table[] = {
894 {
895 .vendor = PCI_VENDOR_ID_MICROSOFT,
896 .device = PCI_DEVICE_ID_HYPERV_VIDEO,
897 },
898 { /* end of list */ }
899 };
900
901 static const struct hv_vmbus_device_id id_table[] = {
902 /* Synthetic Video Device GUID */
903 {HV_SYNTHVID_GUID},
904 {}
905 };
906
907 MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
908 MODULE_DEVICE_TABLE(vmbus, id_table);
909
910 static struct hv_driver hvfb_drv = {
911 .name = KBUILD_MODNAME,
912 .id_table = id_table,
913 .probe = hvfb_probe,
914 .remove = hvfb_remove,
915 .driver = {
916 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
917 },
918 };
919
hvfb_pci_stub_probe(struct pci_dev * pdev,const struct pci_device_id * ent)920 static int hvfb_pci_stub_probe(struct pci_dev *pdev,
921 const struct pci_device_id *ent)
922 {
923 return 0;
924 }
925
hvfb_pci_stub_remove(struct pci_dev * pdev)926 static void hvfb_pci_stub_remove(struct pci_dev *pdev)
927 {
928 }
929
930 static struct pci_driver hvfb_pci_stub_driver = {
931 .name = KBUILD_MODNAME,
932 .id_table = pci_stub_id_table,
933 .probe = hvfb_pci_stub_probe,
934 .remove = hvfb_pci_stub_remove,
935 .driver = {
936 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
937 }
938 };
939
hvfb_drv_init(void)940 static int __init hvfb_drv_init(void)
941 {
942 int ret;
943
944 ret = vmbus_driver_register(&hvfb_drv);
945 if (ret != 0)
946 return ret;
947
948 ret = pci_register_driver(&hvfb_pci_stub_driver);
949 if (ret != 0) {
950 vmbus_driver_unregister(&hvfb_drv);
951 return ret;
952 }
953
954 return 0;
955 }
956
hvfb_drv_exit(void)957 static void __exit hvfb_drv_exit(void)
958 {
959 pci_unregister_driver(&hvfb_pci_stub_driver);
960 vmbus_driver_unregister(&hvfb_drv);
961 }
962
963 module_init(hvfb_drv_init);
964 module_exit(hvfb_drv_exit);
965
966 MODULE_LICENSE("GPL");
967 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver");
968
