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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
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
86enum pipe_msg_type {
87 PIPE_MSG_INVALID,
88 PIPE_MSG_DATA,
89 PIPE_MSG_MAX
90};
91
92struct pipe_msg_hdr {
93 u32 type;
94 u32 size;
95} __packed;
96
97
98enum 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
119struct hvd_screen_info {
120 u16 width;
121 u16 height;
122} __packed;
123
124struct synthvid_msg_hdr {
125 u32 type;
126 u32 size;
127} __packed;
128
129struct synthvid_version_req {
130 u32 version;
131} __packed;
132
133struct synthvid_version_resp {
134 u32 version;
135 u8 is_accepted;
136 u8 max_video_outputs;
137} __packed;
138
139struct synthvid_supported_resolution_req {
140 u8 maximum_resolution_count;
141} __packed;
142
143struct 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
152struct synthvid_vram_location {
153 u64 user_ctx;
154 u8 is_vram_gpa_specified;
155 u64 vram_gpa;
156} __packed;
157
158struct synthvid_vram_location_ack {
159 u64 user_ctx;
160} __packed;
161
162struct 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
171struct synthvid_situation_update {
172 u64 user_ctx;
173 u8 video_output_count;
174 struct video_output_situation video_output[1];
175} __packed;
176
177struct synthvid_situation_update_ack {
178 u64 user_ctx;
179} __packed;
180
181struct 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
195struct synthvid_pointer_shape {
196 u8 part_idx;
197 u8 is_argb;
198 u32 width;
199 u32 height;
200 u32 hot_x;
201 u32 hot_y;
202 u8 data[4];
203} __packed;
204
205struct 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
212struct rect {
213 s32 x1, y1;
214 s32 x2, y2;
215} __packed;
216
217struct synthvid_dirt {
218 u8 video_output;
219 u8 dirt_count;
220 struct rect rect[1];
221} __packed;
222
223struct 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
244#define HVFB_WIDTH 1152
245#define HVFB_HEIGHT 864
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
254struct hvfb_par {
255 struct fb_info *info;
256 struct resource *mem;
257 bool fb_ready;
258 struct completion wait;
259 u32 synthvid_version;
260
261 struct delayed_work dwork;
262 bool update;
263 bool update_saved;
264
265 u32 pseudo_palette[16];
266 u8 init_buf[MAX_VMBUS_PKT_SIZE];
267 u8 recv_buf[MAX_VMBUS_PKT_SIZE];
268
269
270 bool synchronous_fb;
271
272
273 bool need_docopy;
274
275 struct notifier_block hvfb_panic_nb;
276
277
278 unsigned char *dio_vp;
279 unsigned char *mmio_vp;
280 phys_addr_t mmio_pp;
281
282
283 int x1, y1, x2, y2;
284 bool delayed_refresh;
285 spinlock_t delayed_refresh_lock;
286};
287
288static uint screen_width = HVFB_WIDTH;
289static uint screen_height = HVFB_HEIGHT;
290static uint screen_width_max = HVFB_WIDTH;
291static uint screen_height_max = HVFB_HEIGHT;
292static uint screen_depth;
293static uint screen_fb_size;
294static uint dio_fb_size;
295
296
297static inline int synthvid_send(struct hv_device *hdev,
298 struct synthvid_msg *msg)
299{
300 static atomic64_t request_id = ATOMIC64_INIT(0);
301 int ret;
302
303 msg->pipe_hdr.type = PIPE_MSG_DATA;
304 msg->pipe_hdr.size = msg->vid_hdr.size;
305
306 ret = vmbus_sendpacket(hdev->channel, msg,
307 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr),
308 atomic64_inc_return(&request_id),
309 VM_PKT_DATA_INBAND, 0);
310
311 if (ret)
312 pr_err_ratelimited("Unable to send packet via vmbus; error %d\n", ret);
313
314 return ret;
315}
316
317
318
319static int synthvid_send_situ(struct hv_device *hdev)
320{
321 struct fb_info *info = hv_get_drvdata(hdev);
322 struct synthvid_msg msg;
323
324 if (!info)
325 return -ENODEV;
326
327 memset(&msg, 0, sizeof(struct synthvid_msg));
328
329 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
330 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
331 sizeof(struct synthvid_situation_update);
332 msg.situ.user_ctx = 0;
333 msg.situ.video_output_count = 1;
334 msg.situ.video_output[0].active = 1;
335 msg.situ.video_output[0].vram_offset = 0;
336 msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel;
337 msg.situ.video_output[0].width_pixels = info->var.xres;
338 msg.situ.video_output[0].height_pixels = info->var.yres;
339 msg.situ.video_output[0].pitch_bytes = info->fix.line_length;
340
341 synthvid_send(hdev, &msg);
342
343 return 0;
344}
345
346
347static int synthvid_send_ptr(struct hv_device *hdev)
348{
349 struct synthvid_msg msg;
350
351 memset(&msg, 0, sizeof(struct synthvid_msg));
352 msg.vid_hdr.type = SYNTHVID_POINTER_POSITION;
353 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
354 sizeof(struct synthvid_pointer_position);
355 msg.ptr_pos.is_visible = 1;
356 msg.ptr_pos.video_output = 0;
357 msg.ptr_pos.image_x = 0;
358 msg.ptr_pos.image_y = 0;
359 synthvid_send(hdev, &msg);
360
361 memset(&msg, 0, sizeof(struct synthvid_msg));
362 msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE;
363 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
364 sizeof(struct synthvid_pointer_shape);
365 msg.ptr_shape.part_idx = CURSOR_COMPLETE;
366 msg.ptr_shape.is_argb = 1;
367 msg.ptr_shape.width = 1;
368 msg.ptr_shape.height = 1;
369 msg.ptr_shape.hot_x = 0;
370 msg.ptr_shape.hot_y = 0;
371 msg.ptr_shape.data[0] = 0;
372 msg.ptr_shape.data[1] = 1;
373 msg.ptr_shape.data[2] = 1;
374 msg.ptr_shape.data[3] = 1;
375 synthvid_send(hdev, &msg);
376
377 return 0;
378}
379
380
381static int
382synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2)
383{
384 struct hv_device *hdev = device_to_hv_device(info->device);
385 struct synthvid_msg msg;
386
387 memset(&msg, 0, sizeof(struct synthvid_msg));
388 if (x2 == INT_MAX)
389 x2 = info->var.xres;
390 if (y2 == INT_MAX)
391 y2 = info->var.yres;
392
393 msg.vid_hdr.type = SYNTHVID_DIRT;
394 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
395 sizeof(struct synthvid_dirt);
396 msg.dirt.video_output = 0;
397 msg.dirt.dirt_count = 1;
398 msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1;
399 msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1;
400 msg.dirt.rect[0].x2 =
401 (x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2;
402 msg.dirt.rect[0].y2 =
403 (y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2;
404
405 synthvid_send(hdev, &msg);
406
407 return 0;
408}
409
410static void hvfb_docopy(struct hvfb_par *par,
411 unsigned long offset,
412 unsigned long size)
413{
414 if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready ||
415 size == 0 || offset >= dio_fb_size)
416 return;
417
418 if (offset + size > dio_fb_size)
419 size = dio_fb_size - offset;
420
421 memcpy(par->mmio_vp + offset, par->dio_vp + offset, size);
422}
423
424
425static void synthvid_deferred_io(struct fb_info *p,
426 struct list_head *pagelist)
427{
428 struct hvfb_par *par = p->par;
429 struct page *page;
430 unsigned long start, end;
431 int y1, y2, miny, maxy;
432
433 miny = INT_MAX;
434 maxy = 0;
435
436
437
438
439
440
441
442 list_for_each_entry(page, pagelist, lru) {
443 start = page->index << PAGE_SHIFT;
444 end = start + PAGE_SIZE - 1;
445 y1 = start / p->fix.line_length;
446 y2 = end / p->fix.line_length;
447 miny = min_t(int, miny, y1);
448 maxy = max_t(int, maxy, y2);
449
450
451 if (par->fb_ready && par->need_docopy)
452 hvfb_docopy(par, start, PAGE_SIZE);
453 }
454
455 if (par->fb_ready && par->update)
456 synthvid_update(p, 0, miny, p->var.xres, maxy + 1);
457}
458
459static struct fb_deferred_io synthvid_defio = {
460 .delay = HZ / 20,
461 .deferred_io = synthvid_deferred_io,
462};
463
464
465
466
467
468
469static void synthvid_recv_sub(struct hv_device *hdev)
470{
471 struct fb_info *info = hv_get_drvdata(hdev);
472 struct hvfb_par *par;
473 struct synthvid_msg *msg;
474
475 if (!info)
476 return;
477
478 par = info->par;
479 msg = (struct synthvid_msg *)par->recv_buf;
480
481
482 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
483 msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE ||
484 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
485 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE);
486 complete(&par->wait);
487 return;
488 }
489
490
491 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) {
492 if (par->fb_ready) {
493 synthvid_send_ptr(hdev);
494 synthvid_send_situ(hdev);
495 }
496
497 par->update = msg->feature_chg.is_dirt_needed;
498 if (par->update)
499 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
500 }
501}
502
503
504static void synthvid_receive(void *ctx)
505{
506 struct hv_device *hdev = ctx;
507 struct fb_info *info = hv_get_drvdata(hdev);
508 struct hvfb_par *par;
509 struct synthvid_msg *recv_buf;
510 u32 bytes_recvd;
511 u64 req_id;
512 int ret;
513
514 if (!info)
515 return;
516
517 par = info->par;
518 recv_buf = (struct synthvid_msg *)par->recv_buf;
519
520 do {
521 ret = vmbus_recvpacket(hdev->channel, recv_buf,
522 MAX_VMBUS_PKT_SIZE,
523 &bytes_recvd, &req_id);
524 if (bytes_recvd > 0 &&
525 recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
526 synthvid_recv_sub(hdev);
527 } while (bytes_recvd > 0 && ret == 0);
528}
529
530
531static inline bool synthvid_ver_ge(u32 ver1, u32 ver2)
532{
533 if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) ||
534 (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) &&
535 SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2)))
536 return true;
537
538 return false;
539}
540
541
542static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver)
543{
544 struct fb_info *info = hv_get_drvdata(hdev);
545 struct hvfb_par *par = info->par;
546 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
547 int ret = 0;
548 unsigned long t;
549
550 memset(msg, 0, sizeof(struct synthvid_msg));
551 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
552 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
553 sizeof(struct synthvid_version_req);
554 msg->ver_req.version = ver;
555 synthvid_send(hdev, msg);
556
557 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
558 if (!t) {
559 pr_err("Time out on waiting version response\n");
560 ret = -ETIMEDOUT;
561 goto out;
562 }
563 if (!msg->ver_resp.is_accepted) {
564 ret = -ENODEV;
565 goto out;
566 }
567
568 par->synthvid_version = ver;
569 pr_info("Synthvid Version major %d, minor %d\n",
570 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver));
571
572out:
573 return ret;
574}
575
576
577static int synthvid_get_supported_resolution(struct hv_device *hdev)
578{
579 struct fb_info *info = hv_get_drvdata(hdev);
580 struct hvfb_par *par = info->par;
581 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
582 int ret = 0;
583 unsigned long t;
584 u8 index;
585 int i;
586
587 memset(msg, 0, sizeof(struct synthvid_msg));
588 msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST;
589 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
590 sizeof(struct synthvid_supported_resolution_req);
591
592 msg->resolution_req.maximum_resolution_count =
593 SYNTHVID_MAX_RESOLUTION_COUNT;
594 synthvid_send(hdev, msg);
595
596 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
597 if (!t) {
598 pr_err("Time out on waiting resolution response\n");
599 ret = -ETIMEDOUT;
600 goto out;
601 }
602
603 if (msg->resolution_resp.resolution_count == 0) {
604 pr_err("No supported resolutions\n");
605 ret = -ENODEV;
606 goto out;
607 }
608
609 index = msg->resolution_resp.default_resolution_index;
610 if (index >= msg->resolution_resp.resolution_count) {
611 pr_err("Invalid resolution index: %d\n", index);
612 ret = -ENODEV;
613 goto out;
614 }
615
616 for (i = 0; i < msg->resolution_resp.resolution_count; i++) {
617 screen_width_max = max_t(unsigned int, screen_width_max,
618 msg->resolution_resp.supported_resolution[i].width);
619 screen_height_max = max_t(unsigned int, screen_height_max,
620 msg->resolution_resp.supported_resolution[i].height);
621 }
622
623 screen_width =
624 msg->resolution_resp.supported_resolution[index].width;
625 screen_height =
626 msg->resolution_resp.supported_resolution[index].height;
627
628out:
629 return ret;
630}
631
632
633static int synthvid_connect_vsp(struct hv_device *hdev)
634{
635 struct fb_info *info = hv_get_drvdata(hdev);
636 struct hvfb_par *par = info->par;
637 int ret;
638
639 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE,
640 NULL, 0, synthvid_receive, hdev);
641 if (ret) {
642 pr_err("Unable to open vmbus channel\n");
643 return ret;
644 }
645
646
647 switch (vmbus_proto_version) {
648 case VERSION_WIN10:
649 case VERSION_WIN10_V5:
650 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
651 if (!ret)
652 break;
653 fallthrough;
654 case VERSION_WIN8:
655 case VERSION_WIN8_1:
656 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8);
657 if (!ret)
658 break;
659 fallthrough;
660 case VERSION_WS2008:
661 case VERSION_WIN7:
662 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7);
663 break;
664 default:
665 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
666 break;
667 }
668
669 if (ret) {
670 pr_err("Synthetic video device version not accepted\n");
671 goto error;
672 }
673
674 if (par->synthvid_version == SYNTHVID_VERSION_WIN7)
675 screen_depth = SYNTHVID_DEPTH_WIN7;
676 else
677 screen_depth = SYNTHVID_DEPTH_WIN8;
678
679 if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) {
680 ret = synthvid_get_supported_resolution(hdev);
681 if (ret)
682 pr_info("Failed to get supported resolution from host, use default\n");
683 }
684
685 screen_fb_size = hdev->channel->offermsg.offer.
686 mmio_megabytes * 1024 * 1024;
687
688 return 0;
689
690error:
691 vmbus_close(hdev->channel);
692 return ret;
693}
694
695
696static int synthvid_send_config(struct hv_device *hdev)
697{
698 struct fb_info *info = hv_get_drvdata(hdev);
699 struct hvfb_par *par = info->par;
700 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
701 int ret = 0;
702 unsigned long t;
703
704
705 memset(msg, 0, sizeof(struct synthvid_msg));
706 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
707 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
708 sizeof(struct synthvid_vram_location);
709 msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp;
710 msg->vram.is_vram_gpa_specified = 1;
711 synthvid_send(hdev, msg);
712
713 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
714 if (!t) {
715 pr_err("Time out on waiting vram location ack\n");
716 ret = -ETIMEDOUT;
717 goto out;
718 }
719 if (msg->vram_ack.user_ctx != par->mmio_pp) {
720 pr_err("Unable to set VRAM location\n");
721 ret = -ENODEV;
722 goto out;
723 }
724
725
726 synthvid_send_ptr(hdev);
727 synthvid_send_situ(hdev);
728
729out:
730 return ret;
731}
732
733
734
735
736
737
738
739static void hvfb_update_work(struct work_struct *w)
740{
741 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work);
742 struct fb_info *info = par->info;
743 unsigned long flags;
744 int x1, x2, y1, y2;
745 int j;
746
747 spin_lock_irqsave(&par->delayed_refresh_lock, flags);
748
749 par->delayed_refresh = false;
750
751
752 x1 = par->x1;
753 x2 = par->x2;
754 y1 = par->y1;
755 y2 = par->y2;
756
757
758 par->x1 = par->y1 = INT_MAX;
759 par->x2 = par->y2 = 0;
760
761 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
762
763 if (x1 > info->var.xres || x2 > info->var.xres ||
764 y1 > info->var.yres || y2 > info->var.yres || x2 <= x1)
765 return;
766
767
768 if (par->need_docopy)
769 for (j = y1; j < y2; j++)
770 hvfb_docopy(par,
771 j * info->fix.line_length +
772 (x1 * screen_depth / 8),
773 (x2 - x1) * screen_depth / 8);
774
775
776 if (par->fb_ready && par->update)
777 synthvid_update(info, x1, y1, x2, y2);
778}
779
780
781
782
783
784static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par,
785 int x1, int y1, int w, int h)
786{
787 unsigned long flags;
788 int x2 = x1 + w;
789 int y2 = y1 + h;
790
791 spin_lock_irqsave(&par->delayed_refresh_lock, flags);
792
793
794 par->x1 = min_t(int, par->x1, x1);
795 par->y1 = min_t(int, par->y1, y1);
796 par->x2 = max_t(int, par->x2, x2);
797 par->y2 = max_t(int, par->y2, y2);
798
799
800 if (par->delayed_refresh == false) {
801 schedule_delayed_work(&par->dwork,
802 HVFB_ONDEMAND_THROTTLE);
803 par->delayed_refresh = true;
804 }
805
806 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
807}
808
809static int hvfb_on_panic(struct notifier_block *nb,
810 unsigned long e, void *p)
811{
812 struct hvfb_par *par;
813 struct fb_info *info;
814
815 par = container_of(nb, struct hvfb_par, hvfb_panic_nb);
816 par->synchronous_fb = true;
817 info = par->info;
818 if (par->need_docopy)
819 hvfb_docopy(par, 0, dio_fb_size);
820 synthvid_update(info, 0, 0, INT_MAX, INT_MAX);
821
822 return NOTIFY_DONE;
823}
824
825
826
827static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
828{
829 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN ||
830 var->xres > screen_width || var->yres > screen_height ||
831 var->bits_per_pixel != screen_depth)
832 return -EINVAL;
833
834 var->xres_virtual = var->xres;
835 var->yres_virtual = var->yres;
836
837 return 0;
838}
839
840static int hvfb_set_par(struct fb_info *info)
841{
842 struct hv_device *hdev = device_to_hv_device(info->device);
843
844 return synthvid_send_situ(hdev);
845}
846
847
848static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf)
849{
850 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
851}
852
853static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green,
854 unsigned blue, unsigned transp, struct fb_info *info)
855{
856 u32 *pal = info->pseudo_palette;
857
858 if (regno > 15)
859 return -EINVAL;
860
861 pal[regno] = chan_to_field(red, &info->var.red)
862 | chan_to_field(green, &info->var.green)
863 | chan_to_field(blue, &info->var.blue)
864 | chan_to_field(transp, &info->var.transp);
865
866 return 0;
867}
868
869static int hvfb_blank(int blank, struct fb_info *info)
870{
871 return 1;
872}
873
874static void hvfb_cfb_fillrect(struct fb_info *p,
875 const struct fb_fillrect *rect)
876{
877 struct hvfb_par *par = p->par;
878
879 cfb_fillrect(p, rect);
880 if (par->synchronous_fb)
881 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
882 else
883 hvfb_ondemand_refresh_throttle(par, rect->dx, rect->dy,
884 rect->width, rect->height);
885}
886
887static void hvfb_cfb_copyarea(struct fb_info *p,
888 const struct fb_copyarea *area)
889{
890 struct hvfb_par *par = p->par;
891
892 cfb_copyarea(p, area);
893 if (par->synchronous_fb)
894 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
895 else
896 hvfb_ondemand_refresh_throttle(par, area->dx, area->dy,
897 area->width, area->height);
898}
899
900static void hvfb_cfb_imageblit(struct fb_info *p,
901 const struct fb_image *image)
902{
903 struct hvfb_par *par = p->par;
904
905 cfb_imageblit(p, image);
906 if (par->synchronous_fb)
907 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
908 else
909 hvfb_ondemand_refresh_throttle(par, image->dx, image->dy,
910 image->width, image->height);
911}
912
913static const struct fb_ops hvfb_ops = {
914 .owner = THIS_MODULE,
915 .fb_check_var = hvfb_check_var,
916 .fb_set_par = hvfb_set_par,
917 .fb_setcolreg = hvfb_setcolreg,
918 .fb_fillrect = hvfb_cfb_fillrect,
919 .fb_copyarea = hvfb_cfb_copyarea,
920 .fb_imageblit = hvfb_cfb_imageblit,
921 .fb_blank = hvfb_blank,
922};
923
924
925
926static void hvfb_get_option(struct fb_info *info)
927{
928 struct hvfb_par *par = info->par;
929 char *opt = NULL, *p;
930 uint x = 0, y = 0;
931
932 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt)
933 return;
934
935 p = strsep(&opt, "x");
936 if (!*p || kstrtouint(p, 0, &x) ||
937 !opt || !*opt || kstrtouint(opt, 0, &y)) {
938 pr_err("Screen option is invalid: skipped\n");
939 return;
940 }
941
942 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN ||
943 (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) &&
944 (x > screen_width_max || y > screen_height_max)) ||
945 (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
946 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) ||
947 (par->synthvid_version == SYNTHVID_VERSION_WIN7 &&
948 (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) {
949 pr_err("Screen resolution option is out of range: skipped\n");
950 return;
951 }
952
953 screen_width = x;
954 screen_height = y;
955 return;
956}
957
958
959
960
961
962static phys_addr_t hvfb_get_phymem(struct hv_device *hdev,
963 unsigned int request_size)
964{
965 struct page *page = NULL;
966 dma_addr_t dma_handle;
967 void *vmem;
968 phys_addr_t paddr = 0;
969 unsigned int order = get_order(request_size);
970
971 if (request_size == 0)
972 return -1;
973
974 if (order < MAX_ORDER) {
975
976 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
977 if (!page)
978 return -1;
979
980 paddr = (page_to_pfn(page) << PAGE_SHIFT);
981 } else {
982
983 hdev->device.coherent_dma_mask = DMA_BIT_MASK(64);
984
985 vmem = dma_alloc_coherent(&hdev->device,
986 round_up(request_size, PAGE_SIZE),
987 &dma_handle,
988 GFP_KERNEL | __GFP_NOWARN);
989
990 if (!vmem)
991 return -1;
992
993 paddr = virt_to_phys(vmem);
994 }
995
996 return paddr;
997}
998
999
1000static void hvfb_release_phymem(struct hv_device *hdev,
1001 phys_addr_t paddr, unsigned int size)
1002{
1003 unsigned int order = get_order(size);
1004
1005 if (order < MAX_ORDER)
1006 __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order);
1007 else
1008 dma_free_coherent(&hdev->device,
1009 round_up(size, PAGE_SIZE),
1010 phys_to_virt(paddr),
1011 paddr);
1012}
1013
1014
1015
1016static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
1017{
1018 struct hvfb_par *par = info->par;
1019 struct pci_dev *pdev = NULL;
1020 void __iomem *fb_virt;
1021 int gen2vm = efi_enabled(EFI_BOOT);
1022 resource_size_t pot_start, pot_end;
1023 phys_addr_t paddr;
1024 int ret;
1025
1026 info->apertures = alloc_apertures(1);
1027 if (!info->apertures)
1028 return -ENOMEM;
1029
1030 if (!gen2vm) {
1031 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
1032 PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
1033 if (!pdev) {
1034 pr_err("Unable to find PCI Hyper-V video\n");
1035 return -ENODEV;
1036 }
1037
1038 info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
1039 info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
1040
1041
1042
1043
1044
1045
1046
1047 paddr = hvfb_get_phymem(hdev, screen_fb_size);
1048 if (paddr != (phys_addr_t) -1) {
1049 par->mmio_pp = paddr;
1050 par->mmio_vp = par->dio_vp = __va(paddr);
1051
1052 info->fix.smem_start = paddr;
1053 info->fix.smem_len = screen_fb_size;
1054 info->screen_base = par->mmio_vp;
1055 info->screen_size = screen_fb_size;
1056
1057 par->need_docopy = false;
1058 goto getmem_done;
1059 }
1060 pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n");
1061 } else {
1062 info->apertures->ranges[0].base = screen_info.lfb_base;
1063 info->apertures->ranges[0].size = screen_info.lfb_size;
1064 }
1065
1066
1067
1068
1069
1070 dio_fb_size =
1071 screen_width * screen_height * screen_depth / 8;
1072
1073 if (gen2vm) {
1074 pot_start = 0;
1075 pot_end = -1;
1076 } else {
1077 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) ||
1078 pci_resource_len(pdev, 0) < screen_fb_size) {
1079 pr_err("Resource not available or (0x%lx < 0x%lx)\n",
1080 (unsigned long) pci_resource_len(pdev, 0),
1081 (unsigned long) screen_fb_size);
1082 goto err1;
1083 }
1084
1085 pot_end = pci_resource_end(pdev, 0);
1086 pot_start = pot_end - screen_fb_size + 1;
1087 }
1088
1089 ret = vmbus_allocate_mmio(&par->mem, hdev, pot_start, pot_end,
1090 screen_fb_size, 0x100000, true);
1091 if (ret != 0) {
1092 pr_err("Unable to allocate framebuffer memory\n");
1093 goto err1;
1094 }
1095
1096
1097
1098
1099
1100
1101 fb_virt = ioremap_cache(par->mem->start, screen_fb_size);
1102 if (!fb_virt)
1103 goto err2;
1104
1105
1106 par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE));
1107 if (par->dio_vp == NULL)
1108 goto err3;
1109
1110
1111 par->mmio_pp = par->mem->start;
1112
1113 par->mmio_vp = (unsigned char *) fb_virt;
1114
1115 info->fix.smem_start = par->mem->start;
1116 info->fix.smem_len = dio_fb_size;
1117 info->screen_base = par->dio_vp;
1118 info->screen_size = dio_fb_size;
1119
1120getmem_done:
1121 remove_conflicting_framebuffers(info->apertures,
1122 KBUILD_MODNAME, false);
1123
1124 if (gen2vm) {
1125
1126 screen_info.lfb_size = 0;
1127 screen_info.lfb_base = 0;
1128 screen_info.orig_video_isVGA = 0;
1129 } else {
1130 pci_dev_put(pdev);
1131 }
1132
1133 return 0;
1134
1135err3:
1136 iounmap(fb_virt);
1137err2:
1138 vmbus_free_mmio(par->mem->start, screen_fb_size);
1139 par->mem = NULL;
1140err1:
1141 if (!gen2vm)
1142 pci_dev_put(pdev);
1143
1144 return -ENOMEM;
1145}
1146
1147
1148static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info)
1149{
1150 struct hvfb_par *par = info->par;
1151
1152 if (par->need_docopy) {
1153 vfree(par->dio_vp);
1154 iounmap(info->screen_base);
1155 vmbus_free_mmio(par->mem->start, screen_fb_size);
1156 } else {
1157 hvfb_release_phymem(hdev, info->fix.smem_start,
1158 screen_fb_size);
1159 }
1160
1161 par->mem = NULL;
1162}
1163
1164
1165static int hvfb_probe(struct hv_device *hdev,
1166 const struct hv_vmbus_device_id *dev_id)
1167{
1168 struct fb_info *info;
1169 struct hvfb_par *par;
1170 int ret;
1171
1172 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device);
1173 if (!info)
1174 return -ENOMEM;
1175
1176 par = info->par;
1177 par->info = info;
1178 par->fb_ready = false;
1179 par->need_docopy = true;
1180 init_completion(&par->wait);
1181 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
1182
1183 par->delayed_refresh = false;
1184 spin_lock_init(&par->delayed_refresh_lock);
1185 par->x1 = par->y1 = INT_MAX;
1186 par->x2 = par->y2 = 0;
1187
1188
1189 hv_set_drvdata(hdev, info);
1190 ret = synthvid_connect_vsp(hdev);
1191 if (ret) {
1192 pr_err("Unable to connect to VSP\n");
1193 goto error1;
1194 }
1195
1196 hvfb_get_option(info);
1197 pr_info("Screen resolution: %dx%d, Color depth: %d\n",
1198 screen_width, screen_height, screen_depth);
1199
1200 ret = hvfb_getmem(hdev, info);
1201 if (ret) {
1202 pr_err("No memory for framebuffer\n");
1203 goto error2;
1204 }
1205
1206
1207 info->flags = FBINFO_DEFAULT;
1208
1209 info->var.xres_virtual = info->var.xres = screen_width;
1210 info->var.yres_virtual = info->var.yres = screen_height;
1211 info->var.bits_per_pixel = screen_depth;
1212
1213 if (info->var.bits_per_pixel == 16) {
1214 info->var.red = (struct fb_bitfield){11, 5, 0};
1215 info->var.green = (struct fb_bitfield){5, 6, 0};
1216 info->var.blue = (struct fb_bitfield){0, 5, 0};
1217 info->var.transp = (struct fb_bitfield){0, 0, 0};
1218 } else {
1219 info->var.red = (struct fb_bitfield){16, 8, 0};
1220 info->var.green = (struct fb_bitfield){8, 8, 0};
1221 info->var.blue = (struct fb_bitfield){0, 8, 0};
1222 info->var.transp = (struct fb_bitfield){24, 8, 0};
1223 }
1224
1225 info->var.activate = FB_ACTIVATE_NOW;
1226 info->var.height = -1;
1227 info->var.width = -1;
1228 info->var.vmode = FB_VMODE_NONINTERLACED;
1229
1230 strcpy(info->fix.id, KBUILD_MODNAME);
1231 info->fix.type = FB_TYPE_PACKED_PIXELS;
1232 info->fix.visual = FB_VISUAL_TRUECOLOR;
1233 info->fix.line_length = screen_width * screen_depth / 8;
1234 info->fix.accel = FB_ACCEL_NONE;
1235
1236 info->fbops = &hvfb_ops;
1237 info->pseudo_palette = par->pseudo_palette;
1238
1239
1240 info->fbdefio = &synthvid_defio;
1241 fb_deferred_io_init(info);
1242
1243
1244 ret = synthvid_send_config(hdev);
1245 if (ret)
1246 goto error;
1247
1248 ret = register_framebuffer(info);
1249 if (ret) {
1250 pr_err("Unable to register framebuffer\n");
1251 goto error;
1252 }
1253
1254 par->fb_ready = true;
1255
1256 par->synchronous_fb = false;
1257 par->hvfb_panic_nb.notifier_call = hvfb_on_panic;
1258 atomic_notifier_chain_register(&panic_notifier_list,
1259 &par->hvfb_panic_nb);
1260
1261 return 0;
1262
1263error:
1264 fb_deferred_io_cleanup(info);
1265 hvfb_putmem(hdev, info);
1266error2:
1267 vmbus_close(hdev->channel);
1268error1:
1269 cancel_delayed_work_sync(&par->dwork);
1270 hv_set_drvdata(hdev, NULL);
1271 framebuffer_release(info);
1272 return ret;
1273}
1274
1275
1276static int hvfb_remove(struct hv_device *hdev)
1277{
1278 struct fb_info *info = hv_get_drvdata(hdev);
1279 struct hvfb_par *par = info->par;
1280
1281 atomic_notifier_chain_unregister(&panic_notifier_list,
1282 &par->hvfb_panic_nb);
1283
1284 par->update = false;
1285 par->fb_ready = false;
1286
1287 fb_deferred_io_cleanup(info);
1288
1289 unregister_framebuffer(info);
1290 cancel_delayed_work_sync(&par->dwork);
1291
1292 vmbus_close(hdev->channel);
1293 hv_set_drvdata(hdev, NULL);
1294
1295 hvfb_putmem(hdev, info);
1296 framebuffer_release(info);
1297
1298 return 0;
1299}
1300
1301static int hvfb_suspend(struct hv_device *hdev)
1302{
1303 struct fb_info *info = hv_get_drvdata(hdev);
1304 struct hvfb_par *par = info->par;
1305
1306 console_lock();
1307
1308
1309 fb_set_suspend(info, 1);
1310
1311 cancel_delayed_work_sync(&par->dwork);
1312 cancel_delayed_work_sync(&info->deferred_work);
1313
1314 par->update_saved = par->update;
1315 par->update = false;
1316 par->fb_ready = false;
1317
1318 vmbus_close(hdev->channel);
1319
1320 console_unlock();
1321
1322 return 0;
1323}
1324
1325static int hvfb_resume(struct hv_device *hdev)
1326{
1327 struct fb_info *info = hv_get_drvdata(hdev);
1328 struct hvfb_par *par = info->par;
1329 int ret;
1330
1331 console_lock();
1332
1333 ret = synthvid_connect_vsp(hdev);
1334 if (ret != 0)
1335 goto out;
1336
1337 ret = synthvid_send_config(hdev);
1338 if (ret != 0) {
1339 vmbus_close(hdev->channel);
1340 goto out;
1341 }
1342
1343 par->fb_ready = true;
1344 par->update = par->update_saved;
1345
1346 schedule_delayed_work(&info->deferred_work, info->fbdefio->delay);
1347 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
1348
1349
1350 fb_set_suspend(info, 0);
1351
1352out:
1353 console_unlock();
1354
1355 return ret;
1356}
1357
1358
1359static const struct pci_device_id pci_stub_id_table[] = {
1360 {
1361 .vendor = PCI_VENDOR_ID_MICROSOFT,
1362 .device = PCI_DEVICE_ID_HYPERV_VIDEO,
1363 },
1364 { }
1365};
1366
1367static const struct hv_vmbus_device_id id_table[] = {
1368
1369 {HV_SYNTHVID_GUID},
1370 {}
1371};
1372
1373MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
1374MODULE_DEVICE_TABLE(vmbus, id_table);
1375
1376static struct hv_driver hvfb_drv = {
1377 .name = KBUILD_MODNAME,
1378 .id_table = id_table,
1379 .probe = hvfb_probe,
1380 .remove = hvfb_remove,
1381 .suspend = hvfb_suspend,
1382 .resume = hvfb_resume,
1383 .driver = {
1384 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1385 },
1386};
1387
1388static int hvfb_pci_stub_probe(struct pci_dev *pdev,
1389 const struct pci_device_id *ent)
1390{
1391 return 0;
1392}
1393
1394static void hvfb_pci_stub_remove(struct pci_dev *pdev)
1395{
1396}
1397
1398static struct pci_driver hvfb_pci_stub_driver = {
1399 .name = KBUILD_MODNAME,
1400 .id_table = pci_stub_id_table,
1401 .probe = hvfb_pci_stub_probe,
1402 .remove = hvfb_pci_stub_remove,
1403 .driver = {
1404 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1405 }
1406};
1407
1408static int __init hvfb_drv_init(void)
1409{
1410 int ret;
1411
1412 ret = vmbus_driver_register(&hvfb_drv);
1413 if (ret != 0)
1414 return ret;
1415
1416 ret = pci_register_driver(&hvfb_pci_stub_driver);
1417 if (ret != 0) {
1418 vmbus_driver_unregister(&hvfb_drv);
1419 return ret;
1420 }
1421
1422 return 0;
1423}
1424
1425static void __exit hvfb_drv_exit(void)
1426{
1427 pci_unregister_driver(&hvfb_pci_stub_driver);
1428 vmbus_driver_unregister(&hvfb_drv);
1429}
1430
1431module_init(hvfb_drv_init);
1432module_exit(hvfb_drv_exit);
1433
1434MODULE_LICENSE("GPL");
1435MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver");
1436