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fbdev: Convert drivers to aperture helpers
[linux-2.6-block.git] / drivers / video / fbdev / hyperv_fb.c
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43aa3132 1// SPDX-License-Identifier: GPL-2.0-only
68a2d20b
HZ		 2/*
3 * Copyright (c) 2012, Microsoft Corporation.
4 *
5 * Author:
6 * Haiyang Zhang <haiyangz@microsoft.com>
68a2d20b
HZ		 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
67e7cdb4
WH		 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
3a6fb6c4
WH		 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.
68a2d20b
HZ		 44 */
45
46#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
47
8d69d008 48#include <linux/aperture.h>
68a2d20b
HZ		 49#include <linux/module.h>
50#include <linux/kernel.h>
34a28083 51#include <linux/vmalloc.h>
68a2d20b
HZ		 52#include <linux/init.h>
53#include <linux/completion.h>
54#include <linux/fb.h>
55#include <linux/pci.h>
f39650de 56#include <linux/panic_notifier.h>
9069fd54 57#include <linux/efi.h>
1ecf3020 58#include <linux/console.h>
68a2d20b
HZ		 59
60#include <linux/hyperv.h>
61
62
63/* Hyper-V Synthetic Video Protocol definitions and structures */
64#define MAX_VMBUS_PKT_SIZE 0x4000
65
66#define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
b0cce4f6 67/* Support for VERSION_WIN7 is removed. #define is retained for reference. */
68a2d20b
HZ		 68#define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
69#define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
67e7cdb4
WH		 70#define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5)
71
72#define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff)
73#define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16)
68a2d20b 74
68a2d20b 75#define SYNTHVID_DEPTH_WIN8 32
68a2d20b
HZ		 76#define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
77
78#define PCI_VENDOR_ID_MICROSOFT 0x1414
79#define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353
80
81
82enum pipe_msg_type {
83 PIPE_MSG_INVALID,
84 PIPE_MSG_DATA,
85 PIPE_MSG_MAX
86};
87
88struct pipe_msg_hdr {
89 u32 type;
90 u32 size; /* size of message after this field */
91} __packed;
92
93
94enum synthvid_msg_type {
95 SYNTHVID_ERROR = 0,
96 SYNTHVID_VERSION_REQUEST = 1,
97 SYNTHVID_VERSION_RESPONSE = 2,
98 SYNTHVID_VRAM_LOCATION = 3,
99 SYNTHVID_VRAM_LOCATION_ACK = 4,
100 SYNTHVID_SITUATION_UPDATE = 5,
101 SYNTHVID_SITUATION_UPDATE_ACK = 6,
102 SYNTHVID_POINTER_POSITION = 7,
103 SYNTHVID_POINTER_SHAPE = 8,
104 SYNTHVID_FEATURE_CHANGE = 9,
105 SYNTHVID_DIRT = 10,
67e7cdb4
WH		 106 SYNTHVID_RESOLUTION_REQUEST = 13,
107 SYNTHVID_RESOLUTION_RESPONSE = 14,
68a2d20b 108
67e7cdb4 109 SYNTHVID_MAX = 15
68a2d20b
HZ		 110};
111
67e7cdb4
WH		 112#define SYNTHVID_EDID_BLOCK_SIZE 128
113#define SYNTHVID_MAX_RESOLUTION_COUNT 64
114
115struct hvd_screen_info {
116 u16 width;
117 u16 height;
118} __packed;
119
68a2d20b
HZ		 120struct synthvid_msg_hdr {
121 u32 type;
122 u32 size; /* size of this header + payload after this field*/
123} __packed;
124
68a2d20b
HZ		 125struct synthvid_version_req {
126 u32 version;
127} __packed;
128
129struct synthvid_version_resp {
130 u32 version;
131 u8 is_accepted;
132 u8 max_video_outputs;
133} __packed;
134
67e7cdb4
WH		 135struct synthvid_supported_resolution_req {
136 u8 maximum_resolution_count;
137} __packed;
138
139struct synthvid_supported_resolution_resp {
140 u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE];
141 u8 resolution_count;
142 u8 default_resolution_index;
143 u8 is_standard;
144 struct hvd_screen_info
145 supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT];
146} __packed;
147
68a2d20b
HZ		 148struct synthvid_vram_location {
149 u64 user_ctx;
150 u8 is_vram_gpa_specified;
151 u64 vram_gpa;
152} __packed;
153
154struct synthvid_vram_location_ack {
155 u64 user_ctx;
156} __packed;
157
158struct video_output_situation {
159 u8 active;
160 u32 vram_offset;
161 u8 depth_bits;
162 u32 width_pixels;
163 u32 height_pixels;
164 u32 pitch_bytes;
165} __packed;
166
167struct synthvid_situation_update {
168 u64 user_ctx;
169 u8 video_output_count;
170 struct video_output_situation video_output[1];
171} __packed;
172
173struct synthvid_situation_update_ack {
174 u64 user_ctx;
175} __packed;
176
177struct synthvid_pointer_position {
178 u8 is_visible;
179 u8 video_output;
180 s32 image_x;
181 s32 image_y;
182} __packed;
183
184
185#define CURSOR_MAX_X 96
186#define CURSOR_MAX_Y 96
187#define CURSOR_ARGB_PIXEL_SIZE 4
188#define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE)
189#define CURSOR_COMPLETE (-1)
190
191struct synthvid_pointer_shape {
192 u8 part_idx;
193 u8 is_argb;
194 u32 width; /* CURSOR_MAX_X at most */
195 u32 height; /* CURSOR_MAX_Y at most */
196 u32 hot_x; /* hotspot relative to upper-left of pointer image */
197 u32 hot_y;
198 u8 data[4];
199} __packed;
200
201struct synthvid_feature_change {
202 u8 is_dirt_needed;
203 u8 is_ptr_pos_needed;
204 u8 is_ptr_shape_needed;
205 u8 is_situ_needed;
206} __packed;
207
208struct rect {
209 s32 x1, y1; /* top left corner */
210 s32 x2, y2; /* bottom right corner, exclusive */
211} __packed;
212
213struct synthvid_dirt {
214 u8 video_output;
215 u8 dirt_count;
216 struct rect rect[1];
217} __packed;
218
219struct synthvid_msg {
220 struct pipe_msg_hdr pipe_hdr;
221 struct synthvid_msg_hdr vid_hdr;
222 union {
223 struct synthvid_version_req ver_req;
224 struct synthvid_version_resp ver_resp;
225 struct synthvid_vram_location vram;
226 struct synthvid_vram_location_ack vram_ack;
227 struct synthvid_situation_update situ;
228 struct synthvid_situation_update_ack situ_ack;
229 struct synthvid_pointer_position ptr_pos;
230 struct synthvid_pointer_shape ptr_shape;
231 struct synthvid_feature_change feature_chg;
232 struct synthvid_dirt dirt;
67e7cdb4
WH		 233 struct synthvid_supported_resolution_req resolution_req;
234 struct synthvid_supported_resolution_resp resolution_resp;
68a2d20b
HZ		 235 };
236} __packed;
237
238
68a2d20b
HZ		 239/* FB driver definitions and structures */
240#define HVFB_WIDTH 1152 /* default screen width */
241#define HVFB_HEIGHT 864 /* default screen height */
242#define HVFB_WIDTH_MIN 640
243#define HVFB_HEIGHT_MIN 480
244
245#define RING_BUFSIZE (256 * 1024)
246#define VSP_TIMEOUT (10 * HZ)
247#define HVFB_UPDATE_DELAY (HZ / 20)
d21987d7 248#define HVFB_ONDEMAND_THROTTLE (HZ / 20)
68a2d20b
HZ		 249
250struct hvfb_par {
251 struct fb_info *info;
35464483 252 struct resource *mem;
68a2d20b
HZ		 253 bool fb_ready; /* fb device is ready */
254 struct completion wait;
255 u32 synthvid_version;
256
257 struct delayed_work dwork;
258 bool update;
1ecf3020 259 bool update_saved; /* The value of 'update' before hibernation */
68a2d20b
HZ		 260
261 u32 pseudo_palette[16];
262 u8 init_buf[MAX_VMBUS_PKT_SIZE];
263 u8 recv_buf[MAX_VMBUS_PKT_SIZE];
3686fe96
DC		 264
265 /* If true, the VSC notifies the VSP on every framebuffer change */
266 bool synchronous_fb;
267
3a6fb6c4
WH		 268 /* If true, need to copy from deferred IO mem to framebuffer mem */
269 bool need_docopy;
270
3686fe96 271 struct notifier_block hvfb_panic_nb;
d21987d7
WH		 272
273 /* Memory for deferred IO and frame buffer itself */
274 unsigned char *dio_vp;
275 unsigned char *mmio_vp;
3a6fb6c4 276 phys_addr_t mmio_pp;
d21987d7
WH		 277
278 /* Dirty rectangle, protected by delayed_refresh_lock */
279 int x1, y1, x2, y2;
280 bool delayed_refresh;
281 spinlock_t delayed_refresh_lock;
68a2d20b
HZ		 282};
283
284static uint screen_width = HVFB_WIDTH;
285static uint screen_height = HVFB_HEIGHT;
286static uint screen_depth;
287static uint screen_fb_size;
d21987d7 288static uint dio_fb_size; /* FB size for deferred IO */
68a2d20b
HZ		 289
290/* Send message to Hyper-V host */
291static inline int synthvid_send(struct hv_device *hdev,
292 struct synthvid_msg *msg)
293{
294 static atomic64_t request_id = ATOMIC64_INIT(0);
295 int ret;
296
297 msg->pipe_hdr.type = PIPE_MSG_DATA;
298 msg->pipe_hdr.size = msg->vid_hdr.size;
299
300 ret = vmbus_sendpacket(hdev->channel, msg,
301 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr),
302 atomic64_inc_return(&request_id),
303 VM_PKT_DATA_INBAND, 0);
304
305 if (ret)
aa5b7d11 306 pr_err_ratelimited("Unable to send packet via vmbus; error %d\n", ret);
68a2d20b
HZ		 307
308 return ret;
309}
310
311
312/* Send screen resolution info to host */
313static int synthvid_send_situ(struct hv_device *hdev)
314{
315 struct fb_info *info = hv_get_drvdata(hdev);
316 struct synthvid_msg msg;
317
318 if (!info)
319 return -ENODEV;
320
321 memset(&msg, 0, sizeof(struct synthvid_msg));
322
323 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
324 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
325 sizeof(struct synthvid_situation_update);
326 msg.situ.user_ctx = 0;
327 msg.situ.video_output_count = 1;
328 msg.situ.video_output[0].active = 1;
329 msg.situ.video_output[0].vram_offset = 0;
330 msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel;
331 msg.situ.video_output[0].width_pixels = info->var.xres;
332 msg.situ.video_output[0].height_pixels = info->var.yres;
333 msg.situ.video_output[0].pitch_bytes = info->fix.line_length;
334
335 synthvid_send(hdev, &msg);
336
337 return 0;
338}
339
340/* Send mouse pointer info to host */
341static int synthvid_send_ptr(struct hv_device *hdev)
342{
343 struct synthvid_msg msg;
344
345 memset(&msg, 0, sizeof(struct synthvid_msg));
346 msg.vid_hdr.type = SYNTHVID_POINTER_POSITION;
347 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
348 sizeof(struct synthvid_pointer_position);
349 msg.ptr_pos.is_visible = 1;
350 msg.ptr_pos.video_output = 0;
351 msg.ptr_pos.image_x = 0;
352 msg.ptr_pos.image_y = 0;
353 synthvid_send(hdev, &msg);
354
355 memset(&msg, 0, sizeof(struct synthvid_msg));
356 msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE;
357 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
358 sizeof(struct synthvid_pointer_shape);
359 msg.ptr_shape.part_idx = CURSOR_COMPLETE;
360 msg.ptr_shape.is_argb = 1;
361 msg.ptr_shape.width = 1;
362 msg.ptr_shape.height = 1;
363 msg.ptr_shape.hot_x = 0;
364 msg.ptr_shape.hot_y = 0;
365 msg.ptr_shape.data[0] = 0;
366 msg.ptr_shape.data[1] = 1;
367 msg.ptr_shape.data[2] = 1;
368 msg.ptr_shape.data[3] = 1;
369 synthvid_send(hdev, &msg);
370
371 return 0;
372}
373
374/* Send updated screen area (dirty rectangle) location to host */
d21987d7
WH		 375static int
376synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2)
68a2d20b
HZ		 377{
378 struct hv_device *hdev = device_to_hv_device(info->device);
379 struct synthvid_msg msg;
380
381 memset(&msg, 0, sizeof(struct synthvid_msg));
d21987d7
WH		 382 if (x2 == INT_MAX)
383 x2 = info->var.xres;
384 if (y2 == INT_MAX)
385 y2 = info->var.yres;
68a2d20b
HZ		 386
387 msg.vid_hdr.type = SYNTHVID_DIRT;
388 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
389 sizeof(struct synthvid_dirt);
390 msg.dirt.video_output = 0;
391 msg.dirt.dirt_count = 1;
d21987d7
WH		 392 msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1;
393 msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1;
394 msg.dirt.rect[0].x2 =
395 (x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2;
396 msg.dirt.rect[0].y2 =
397 (y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2;
68a2d20b
HZ		 398
399 synthvid_send(hdev, &msg);
400
401 return 0;
402}
403
d21987d7
WH		 404static void hvfb_docopy(struct hvfb_par *par,
405 unsigned long offset,
406 unsigned long size)
407{
408 if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready ||
409 size == 0 || offset >= dio_fb_size)
410 return;
411
412 if (offset + size > dio_fb_size)
413 size = dio_fb_size - offset;
414
415 memcpy(par->mmio_vp + offset, par->dio_vp + offset, size);
416}
417
418/* Deferred IO callback */
e80eec1b 419static void synthvid_deferred_io(struct fb_info *p, struct list_head *pagereflist)
d21987d7
WH		 420{
421 struct hvfb_par *par = p->par;
56c134f7 422 struct fb_deferred_io_pageref *pageref;
d21987d7
WH		 423 unsigned long start, end;
424 int y1, y2, miny, maxy;
425
426 miny = INT_MAX;
427 maxy = 0;
428
429 /*
430 * Merge dirty pages. It is possible that last page cross
431 * over the end of frame buffer row yres. This is taken care of
432 * in synthvid_update function by clamping the y2
433 * value to yres.
434 */
e80eec1b 435 list_for_each_entry(pageref, pagereflist, list) {
e2d8b428 436 start = pageref->offset;
d21987d7
WH		 437 end = start + PAGE_SIZE - 1;
438 y1 = start / p->fix.line_length;
439 y2 = end / p->fix.line_length;
440 miny = min_t(int, miny, y1);
441 maxy = max_t(int, maxy, y2);
442
443 /* Copy from dio space to mmio address */
3a6fb6c4 444 if (par->fb_ready && par->need_docopy)
d21987d7
WH		 445 hvfb_docopy(par, start, PAGE_SIZE);
446 }
447
448 if (par->fb_ready && par->update)
449 synthvid_update(p, 0, miny, p->var.xres, maxy + 1);
450}
451
452static struct fb_deferred_io synthvid_defio = {
453 .delay = HZ / 20,
454 .deferred_io = synthvid_deferred_io,
455};
68a2d20b
HZ		 456
457/*
458 * Actions on received messages from host:
459 * Complete the wait event.
460 * Or, reply with screen and cursor info.
461 */
462static void synthvid_recv_sub(struct hv_device *hdev)
463{
464 struct fb_info *info = hv_get_drvdata(hdev);
465 struct hvfb_par *par;
466 struct synthvid_msg *msg;
467
468 if (!info)
469 return;
470
471 par = info->par;
472 msg = (struct synthvid_msg *)par->recv_buf;
473
474 /* Complete the wait event */
475 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
67e7cdb4 476 msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE ||
68a2d20b
HZ		 477 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
478 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE);
479 complete(&par->wait);
480 return;
481 }
482
483 /* Reply with screen and cursor info */
484 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) {
485 if (par->fb_ready) {
486 synthvid_send_ptr(hdev);
487 synthvid_send_situ(hdev);
488 }
489
490 par->update = msg->feature_chg.is_dirt_needed;
491 if (par->update)
492 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
493 }
494}
495
496/* Receive callback for messages from the host */
497static void synthvid_receive(void *ctx)
498{
499 struct hv_device *hdev = ctx;
500 struct fb_info *info = hv_get_drvdata(hdev);
501 struct hvfb_par *par;
502 struct synthvid_msg *recv_buf;
503 u32 bytes_recvd;
504 u64 req_id;
505 int ret;
506
507 if (!info)
508 return;
509
510 par = info->par;
511 recv_buf = (struct synthvid_msg *)par->recv_buf;
512
513 do {
514 ret = vmbus_recvpacket(hdev->channel, recv_buf,
515 MAX_VMBUS_PKT_SIZE,
516 &bytes_recvd, &req_id);
517 if (bytes_recvd > 0 &&
518 recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
519 synthvid_recv_sub(hdev);
520 } while (bytes_recvd > 0 && ret == 0);
521}
522
67e7cdb4
WH		 523/* Check if the ver1 version is equal or greater than ver2 */
524static inline bool synthvid_ver_ge(u32 ver1, u32 ver2)
525{
526 if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) ||
527 (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) &&
528 SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2)))
529 return true;
530
531 return false;
532}
533
68a2d20b
HZ		 534/* Check synthetic video protocol version with the host */
535static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver)
536{
537 struct fb_info *info = hv_get_drvdata(hdev);
538 struct hvfb_par *par = info->par;
539 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
7dea97e0
NMG		 540 int ret = 0;
541 unsigned long t;
68a2d20b
HZ		 542
543 memset(msg, 0, sizeof(struct synthvid_msg));
544 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
545 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
546 sizeof(struct synthvid_version_req);
547 msg->ver_req.version = ver;
548 synthvid_send(hdev, msg);
549
550 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
551 if (!t) {
552 pr_err("Time out on waiting version response\n");
553 ret = -ETIMEDOUT;
554 goto out;
555 }
556 if (!msg->ver_resp.is_accepted) {
557 ret = -ENODEV;
558 goto out;
559 }
560
561 par->synthvid_version = ver;
67e7cdb4
WH		 562 pr_info("Synthvid Version major %d, minor %d\n",
563 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver));
564
565out:
566 return ret;
567}
568
569/* Get current resolution from the host */
570static int synthvid_get_supported_resolution(struct hv_device *hdev)
571{
572 struct fb_info *info = hv_get_drvdata(hdev);
573 struct hvfb_par *par = info->par;
574 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
575 int ret = 0;
576 unsigned long t;
577 u8 index;
67e7cdb4
WH		 578
579 memset(msg, 0, sizeof(struct synthvid_msg));
580 msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST;
581 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
582 sizeof(struct synthvid_supported_resolution_req);
583
584 msg->resolution_req.maximum_resolution_count =
585 SYNTHVID_MAX_RESOLUTION_COUNT;
586 synthvid_send(hdev, msg);
587
588 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
589 if (!t) {
590 pr_err("Time out on waiting resolution response\n");
366c5aa1
CIK		 591 ret = -ETIMEDOUT;
592 goto out;
67e7cdb4
WH		 593 }
594
595 if (msg->resolution_resp.resolution_count == 0) {
596 pr_err("No supported resolutions\n");
597 ret = -ENODEV;
598 goto out;
599 }
600
601 index = msg->resolution_resp.default_resolution_index;
602 if (index >= msg->resolution_resp.resolution_count) {
603 pr_err("Invalid resolution index: %d\n", index);
604 ret = -ENODEV;
605 goto out;
606 }
607
67e7cdb4
WH		 608 screen_width =
609 msg->resolution_resp.supported_resolution[index].width;
610 screen_height =
611 msg->resolution_resp.supported_resolution[index].height;
68a2d20b
HZ		 612
613out:
614 return ret;
615}
616
617/* Connect to VSP (Virtual Service Provider) on host */
618static int synthvid_connect_vsp(struct hv_device *hdev)
619{
620 struct fb_info *info = hv_get_drvdata(hdev);
621 struct hvfb_par *par = info->par;
622 int ret;
623
624 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE,
625 NULL, 0, synthvid_receive, hdev);
626 if (ret) {
627 pr_err("Unable to open vmbus channel\n");
628 return ret;
629 }
630
631 /* Negotiate the protocol version with host */
67e7cdb4
WH		 632 switch (vmbus_proto_version) {
633 case VERSION_WIN10:
634 case VERSION_WIN10_V5:
635 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
636 if (!ret)
637 break;
df561f66 638 fallthrough;
67e7cdb4
WH		 639 case VERSION_WIN8:
640 case VERSION_WIN8_1:
68a2d20b 641 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8);
67e7cdb4
WH		 642 break;
643 default:
644 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
645 break;
646 }
68a2d20b
HZ		 647
648 if (ret) {
649 pr_err("Synthetic video device version not accepted\n");
650 goto error;
651 }
652
b0cce4f6 653 screen_depth = SYNTHVID_DEPTH_WIN8;
67e7cdb4
WH		 654 if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) {
655 ret = synthvid_get_supported_resolution(hdev);
656 if (ret)
657 pr_info("Failed to get supported resolution from host, use default\n");
658 }
659
9069fd54
GH		 660 screen_fb_size = hdev->channel->offermsg.offer.
661 mmio_megabytes * 1024 * 1024;
68a2d20b
HZ		 662
663 return 0;
664
665error:
666 vmbus_close(hdev->channel);
667 return ret;
668}
669
670/* Send VRAM and Situation messages to the host */
671static int synthvid_send_config(struct hv_device *hdev)
672{
673 struct fb_info *info = hv_get_drvdata(hdev);
674 struct hvfb_par *par = info->par;
675 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
7dea97e0
NMG		 676 int ret = 0;
677 unsigned long t;
68a2d20b
HZ		 678
679 /* Send VRAM location */
680 memset(msg, 0, sizeof(struct synthvid_msg));
681 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
682 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
683 sizeof(struct synthvid_vram_location);
d21987d7 684 msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp;
68a2d20b
HZ		 685 msg->vram.is_vram_gpa_specified = 1;
686 synthvid_send(hdev, msg);
687
688 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
689 if (!t) {
690 pr_err("Time out on waiting vram location ack\n");
691 ret = -ETIMEDOUT;
692 goto out;
693 }
d21987d7 694 if (msg->vram_ack.user_ctx != par->mmio_pp) {
68a2d20b
HZ		 695 pr_err("Unable to set VRAM location\n");
696 ret = -ENODEV;
697 goto out;
698 }
699
700 /* Send pointer and situation update */
701 synthvid_send_ptr(hdev);
702 synthvid_send_situ(hdev);
703
704out:
705 return ret;
706}
707
708
709/*
710 * Delayed work callback:
d21987d7
WH		 711 * It is scheduled to call whenever update request is received and it has
712 * not been called in last HVFB_ONDEMAND_THROTTLE time interval.
68a2d20b
HZ		 713 */
714static void hvfb_update_work(struct work_struct *w)
715{
716 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work);
717 struct fb_info *info = par->info;
d21987d7
WH		 718 unsigned long flags;
719 int x1, x2, y1, y2;
720 int j;
721
722 spin_lock_irqsave(&par->delayed_refresh_lock, flags);
723 /* Reset the request flag */
724 par->delayed_refresh = false;
725
726 /* Store the dirty rectangle to local variables */
727 x1 = par->x1;
728 x2 = par->x2;
729 y1 = par->y1;
730 y2 = par->y2;
731
732 /* Clear dirty rectangle */
733 par->x1 = par->y1 = INT_MAX;
734 par->x2 = par->y2 = 0;
735
736 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
737
738 if (x1 > info->var.xres || x2 > info->var.xres ||
739 y1 > info->var.yres || y2 > info->var.yres || x2 <= x1)
740 return;
741
742 /* Copy the dirty rectangle to frame buffer memory */
3a6fb6c4
WH		 743 if (par->need_docopy)
744 for (j = y1; j < y2; j++)
745 hvfb_docopy(par,
746 j * info->fix.line_length +
747 (x1 * screen_depth / 8),
748 (x2 - x1) * screen_depth / 8);
d21987d7
WH		 749
750 /* Refresh */
751 if (par->fb_ready && par->update)
752 synthvid_update(info, x1, y1, x2, y2);
753}
68a2d20b 754
d21987d7
WH		 755/*
756 * Control the on-demand refresh frequency. It schedules a delayed
757 * screen update if it has not yet.
758 */
759static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par,
760 int x1, int y1, int w, int h)
761{
762 unsigned long flags;
763 int x2 = x1 + w;
764 int y2 = y1 + h;
765
766 spin_lock_irqsave(&par->delayed_refresh_lock, flags);
767
768 /* Merge dirty rectangle */
769 par->x1 = min_t(int, par->x1, x1);
770 par->y1 = min_t(int, par->y1, y1);
771 par->x2 = max_t(int, par->x2, x2);
772 par->y2 = max_t(int, par->y2, y2);
773
774 /* Schedule a delayed screen update if not yet */
775 if (par->delayed_refresh == false) {
776 schedule_delayed_work(&par->dwork,
777 HVFB_ONDEMAND_THROTTLE);
778 par->delayed_refresh = true;
779 }
68a2d20b 780
d21987d7 781 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
68a2d20b
HZ		 782}
783
3686fe96
DC		 784static int hvfb_on_panic(struct notifier_block *nb,
785 unsigned long e, void *p)
786{
787 struct hvfb_par *par;
788 struct fb_info *info;
789
790 par = container_of(nb, struct hvfb_par, hvfb_panic_nb);
791 par->synchronous_fb = true;
792 info = par->info;
3a6fb6c4
WH		 793 if (par->need_docopy)
794 hvfb_docopy(par, 0, dio_fb_size);
d21987d7 795 synthvid_update(info, 0, 0, INT_MAX, INT_MAX);
3686fe96
DC		 796
797 return NOTIFY_DONE;
798}
68a2d20b
HZ		 799
800/* Framebuffer operation handlers */
801
802static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
803{
804 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN ||
805 var->xres > screen_width || var->yres > screen_height ||
806 var->bits_per_pixel != screen_depth)
807 return -EINVAL;
808
809 var->xres_virtual = var->xres;
810 var->yres_virtual = var->yres;
811
812 return 0;
813}
814
815static int hvfb_set_par(struct fb_info *info)
816{
817 struct hv_device *hdev = device_to_hv_device(info->device);
818
819 return synthvid_send_situ(hdev);
820}
821
822
823static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf)
824{
825 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
826}
827
828static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green,
829 unsigned blue, unsigned transp, struct fb_info *info)
830{
831 u32 *pal = info->pseudo_palette;
832
833 if (regno > 15)
834 return -EINVAL;
835
836 pal[regno] = chan_to_field(red, &info->var.red)
837 | chan_to_field(green, &info->var.green)
838 | chan_to_field(blue, &info->var.blue)
839 | chan_to_field(transp, &info->var.transp);
840
841 return 0;
842}
843
9b5254b4
GH		 844static int hvfb_blank(int blank, struct fb_info *info)
845{
846 return 1; /* get fb_blank to set the colormap to all black */
847}
68a2d20b 848
3686fe96
DC		 849static void hvfb_cfb_fillrect(struct fb_info *p,
850 const struct fb_fillrect *rect)
851{
852 struct hvfb_par *par = p->par;
853
854 cfb_fillrect(p, rect);
855 if (par->synchronous_fb)
d21987d7
WH		 856 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
857 else
858 hvfb_ondemand_refresh_throttle(par, rect->dx, rect->dy,
859 rect->width, rect->height);
3686fe96
DC		 860}
861
862static void hvfb_cfb_copyarea(struct fb_info *p,
863 const struct fb_copyarea *area)
864{
865 struct hvfb_par *par = p->par;
866
867 cfb_copyarea(p, area);
868 if (par->synchronous_fb)
d21987d7
WH		 869 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
870 else
871 hvfb_ondemand_refresh_throttle(par, area->dx, area->dy,
872 area->width, area->height);
3686fe96
DC		 873}
874
875static void hvfb_cfb_imageblit(struct fb_info *p,
876 const struct fb_image *image)
877{
878 struct hvfb_par *par = p->par;
879
880 cfb_imageblit(p, image);
881 if (par->synchronous_fb)
d21987d7
WH		 882 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
883 else
884 hvfb_ondemand_refresh_throttle(par, image->dx, image->dy,
885 image->width, image->height);
3686fe96
DC		 886}
887
8a48ac33 888static const struct fb_ops hvfb_ops = {
68a2d20b
HZ		 889 .owner = THIS_MODULE,
890 .fb_check_var = hvfb_check_var,
891 .fb_set_par = hvfb_set_par,
892 .fb_setcolreg = hvfb_setcolreg,
3686fe96
DC		 893 .fb_fillrect = hvfb_cfb_fillrect,
894 .fb_copyarea = hvfb_cfb_copyarea,
895 .fb_imageblit = hvfb_cfb_imageblit,
9b5254b4 896 .fb_blank = hvfb_blank,
59055851 897 .fb_mmap = fb_deferred_io_mmap,
68a2d20b
HZ		 898};
899
900
901/* Get options from kernel paramenter "video=" */
902static void hvfb_get_option(struct fb_info *info)
903{
904 struct hvfb_par *par = info->par;
905 char *opt = NULL, *p;
906 uint x = 0, y = 0;
907
908 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt)
909 return;
910
911 p = strsep(&opt, "x");
912 if (!*p || kstrtouint(p, 0, &x) ||
913 !opt || !*opt || kstrtouint(opt, 0, &y)) {
914 pr_err("Screen option is invalid: skipped\n");
915 return;
916 }
917
918 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN ||
67e7cdb4 919 (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) &&
9ff5549b 920 (x * y * screen_depth / 8 > screen_fb_size)) ||
68a2d20b 921 (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
b0cce4f6 922 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8)) {
68a2d20b
HZ		 923 pr_err("Screen resolution option is out of range: skipped\n");
924 return;
925 }
926
927 screen_width = x;
928 screen_height = y;
929 return;
930}
931
3a6fb6c4
WH		 932/*
933 * Allocate enough contiguous physical memory.
934 * Return physical address if succeeded or -1 if failed.
935 */
936static phys_addr_t hvfb_get_phymem(struct hv_device *hdev,
937 unsigned int request_size)
938{
939 struct page *page = NULL;
940 dma_addr_t dma_handle;
941 void *vmem;
942 phys_addr_t paddr = 0;
943 unsigned int order = get_order(request_size);
944
945 if (request_size == 0)
946 return -1;
947
948 if (order < MAX_ORDER) {
949 /* Call alloc_pages if the size is less than 2^MAX_ORDER */
950 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
951 if (!page)
952 return -1;
953
954 paddr = (page_to_pfn(page) << PAGE_SHIFT);
955 } else {
956 /* Allocate from CMA */
957 hdev->device.coherent_dma_mask = DMA_BIT_MASK(64);
958
959 vmem = dma_alloc_coherent(&hdev->device,
960 round_up(request_size, PAGE_SIZE),
961 &dma_handle,
962 GFP_KERNEL | __GFP_NOWARN);
963
964 if (!vmem)
965 return -1;
966
967 paddr = virt_to_phys(vmem);
968 }
969
970 return paddr;
971}
972
973/* Release contiguous physical memory */
974static void hvfb_release_phymem(struct hv_device *hdev,
975 phys_addr_t paddr, unsigned int size)
976{
977 unsigned int order = get_order(size);
978
979 if (order < MAX_ORDER)
980 __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order);
981 else
982 dma_free_coherent(&hdev->device,
983 round_up(size, PAGE_SIZE),
984 phys_to_virt(paddr),
985 paddr);
986}
987
68a2d20b
HZ		 988
989/* Get framebuffer memory from Hyper-V video pci space */
35464483 990static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
68a2d20b 991{
9069fd54
GH		 992 struct hvfb_par *par = info->par;
993 struct pci_dev *pdev = NULL;
68a2d20b 994 void __iomem *fb_virt;
9069fd54 995 int gen2vm = efi_enabled(EFI_BOOT);
3a6fb6c4 996 phys_addr_t paddr;
9069fd54 997 int ret;
68a2d20b 998
3a6fb6c4
WH		 999 info->apertures = alloc_apertures(1);
1000 if (!info->apertures)
1001 return -ENOMEM;
d21987d7 1002
3a6fb6c4 1003 if (!gen2vm) {
9069fd54 1004 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
3a6fb6c4 1005 PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
9069fd54
GH		 1006 if (!pdev) {
1007 pr_err("Unable to find PCI Hyper-V video\n");
1008 return -ENODEV;
1009 }
68a2d20b 1010
3a6fb6c4
WH		 1011 info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
1012 info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
1013
1014 /*
1015 * For Gen 1 VM, we can directly use the contiguous memory
1016 * from VM. If we succeed, deferred IO happens directly
1017 * on this allocated framebuffer memory, avoiding extra
1018 * memory copy.
1019 */
1020 paddr = hvfb_get_phymem(hdev, screen_fb_size);
1021 if (paddr != (phys_addr_t) -1) {
1022 par->mmio_pp = paddr;
1023 par->mmio_vp = par->dio_vp = __va(paddr);
1024
1025 info->fix.smem_start = paddr;
1026 info->fix.smem_len = screen_fb_size;
1027 info->screen_base = par->mmio_vp;
1028 info->screen_size = screen_fb_size;
1029
1030 par->need_docopy = false;
1031 goto getmem_done;
1032 }
1033 pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n");
1034 } else {
1035 info->apertures->ranges[0].base = screen_info.lfb_base;
1036 info->apertures->ranges[0].size = screen_info.lfb_size;
1037 }
1038
1039 /*
1040 * Cannot use the contiguous physical memory.
1041 * Allocate mmio space for framebuffer.
1042 */
1043 dio_fb_size =
1044 screen_width * screen_height * screen_depth / 8;
1045
c4b4d704 1046 ret = vmbus_allocate_mmio(&par->mem, hdev, 0, -1,
35464483
JO		 1047 screen_fb_size, 0x100000, true);
1048 if (ret != 0) {
1049 pr_err("Unable to allocate framebuffer memory\n");
1050 goto err1;
9069fd54 1051 }
68a2d20b 1052
5f1251a4
DC		 1053 /*
1054 * Map the VRAM cacheable for performance. This is also required for
1055 * VM Connect to display properly for ARM64 Linux VM, as the host also
1056 * maps the VRAM cacheable.
1057 */
1058 fb_virt = ioremap_cache(par->mem->start, screen_fb_size);
68a2d20b
HZ		 1059 if (!fb_virt)
1060 goto err2;
1061
d21987d7
WH		 1062 /* Allocate memory for deferred IO */
1063 par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE));
1064 if (par->dio_vp == NULL)
1065 goto err3;
1066
d21987d7
WH		 1067 /* Physical address of FB device */
1068 par->mmio_pp = par->mem->start;
1069 /* Virtual address of FB device */
1070 par->mmio_vp = (unsigned char *) fb_virt;
1071
35464483 1072 info->fix.smem_start = par->mem->start;
d21987d7
WH		 1073 info->fix.smem_len = dio_fb_size;
1074 info->screen_base = par->dio_vp;
1075 info->screen_size = dio_fb_size;
68a2d20b 1076
3a6fb6c4 1077getmem_done:
8d69d008
TZ		 1078 aperture_remove_conflicting_devices(info->apertures->ranges[0].base,
1079 info->apertures->ranges[0].size,
1080 KBUILD_MODNAME, false);
3cb73bc3
KS		 1081
1082 if (gen2vm) {
1083 /* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */
1084 screen_info.lfb_size = 0;
1085 screen_info.lfb_base = 0;
1086 screen_info.orig_video_isVGA = 0;
1087 } else {
9069fd54 1088 pci_dev_put(pdev);
3cb73bc3 1089 }
9069fd54 1090
68a2d20b
HZ		 1091 return 0;
1092
1093err3:
1094 iounmap(fb_virt);
1095err2:
696ca5e8 1096 vmbus_free_mmio(par->mem->start, screen_fb_size);
35464483 1097 par->mem = NULL;
68a2d20b 1098err1:
9069fd54
GH		 1099 if (!gen2vm)
1100 pci_dev_put(pdev);
1101
68a2d20b
HZ		 1102 return -ENOMEM;
1103}
1104
1105/* Release the framebuffer */
3a6fb6c4 1106static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info)
68a2d20b 1107{
9069fd54
GH		 1108 struct hvfb_par *par = info->par;
1109
3a6fb6c4
WH		 1110 if (par->need_docopy) {
1111 vfree(par->dio_vp);
1112 iounmap(info->screen_base);
1113 vmbus_free_mmio(par->mem->start, screen_fb_size);
1114 } else {
1115 hvfb_release_phymem(hdev, info->fix.smem_start,
1116 screen_fb_size);
1117 }
1118
35464483 1119 par->mem = NULL;
68a2d20b
HZ		 1120}
1121
1122
1123static int hvfb_probe(struct hv_device *hdev,
1124 const struct hv_vmbus_device_id *dev_id)
1125{
1126 struct fb_info *info;
1127 struct hvfb_par *par;
1128 int ret;
1129
1130 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device);
0adcdbcb 1131 if (!info)
68a2d20b 1132 return -ENOMEM;
68a2d20b
HZ		 1133
1134 par = info->par;
1135 par->info = info;
1136 par->fb_ready = false;
3a6fb6c4 1137 par->need_docopy = true;
68a2d20b
HZ		 1138 init_completion(&par->wait);
1139 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
1140
d21987d7
WH		 1141 par->delayed_refresh = false;
1142 spin_lock_init(&par->delayed_refresh_lock);
1143 par->x1 = par->y1 = INT_MAX;
1144 par->x2 = par->y2 = 0;
1145
68a2d20b
HZ		 1146 /* Connect to VSP */
1147 hv_set_drvdata(hdev, info);
1148 ret = synthvid_connect_vsp(hdev);
1149 if (ret) {
1150 pr_err("Unable to connect to VSP\n");
1151 goto error1;
1152 }
1153
67e7cdb4 1154 hvfb_get_option(info);
9ff5549b
MK		 1155 pr_info("Screen resolution: %dx%d, Color depth: %d, Frame buffer size: %d\n",
1156 screen_width, screen_height, screen_depth, screen_fb_size);
67e7cdb4 1157
35464483 1158 ret = hvfb_getmem(hdev, info);
68a2d20b
HZ		 1159 if (ret) {
1160 pr_err("No memory for framebuffer\n");
1161 goto error2;
1162 }
1163
68a2d20b
HZ		 1164 /* Set up fb_info */
1165 info->flags = FBINFO_DEFAULT;
1166
1167 info->var.xres_virtual = info->var.xres = screen_width;
1168 info->var.yres_virtual = info->var.yres = screen_height;
1169 info->var.bits_per_pixel = screen_depth;
1170
1171 if (info->var.bits_per_pixel == 16) {
1172 info->var.red = (struct fb_bitfield){11, 5, 0};
1173 info->var.green = (struct fb_bitfield){5, 6, 0};
1174 info->var.blue = (struct fb_bitfield){0, 5, 0};
1175 info->var.transp = (struct fb_bitfield){0, 0, 0};
1176 } else {
1177 info->var.red = (struct fb_bitfield){16, 8, 0};
1178 info->var.green = (struct fb_bitfield){8, 8, 0};
1179 info->var.blue = (struct fb_bitfield){0, 8, 0};
1180 info->var.transp = (struct fb_bitfield){24, 8, 0};
1181 }
1182
1183 info->var.activate = FB_ACTIVATE_NOW;
1184 info->var.height = -1;
1185 info->var.width = -1;
1186 info->var.vmode = FB_VMODE_NONINTERLACED;
1187
1188 strcpy(info->fix.id, KBUILD_MODNAME);
1189 info->fix.type = FB_TYPE_PACKED_PIXELS;
1190 info->fix.visual = FB_VISUAL_TRUECOLOR;
1191 info->fix.line_length = screen_width * screen_depth / 8;
1192 info->fix.accel = FB_ACCEL_NONE;
1193
1194 info->fbops = &hvfb_ops;
1195 info->pseudo_palette = par->pseudo_palette;
1196
d21987d7
WH		 1197 /* Initialize deferred IO */
1198 info->fbdefio = &synthvid_defio;
1199 fb_deferred_io_init(info);
1200
68a2d20b
HZ		 1201 /* Send config to host */
1202 ret = synthvid_send_config(hdev);
1203 if (ret)
1204 goto error;
1205
1206 ret = register_framebuffer(info);
1207 if (ret) {
1208 pr_err("Unable to register framebuffer\n");
1209 goto error;
1210 }
1211
1212 par->fb_ready = true;
1213
3686fe96
DC		 1214 par->synchronous_fb = false;
1215 par->hvfb_panic_nb.notifier_call = hvfb_on_panic;
1216 atomic_notifier_chain_register(&panic_notifier_list,
1217 &par->hvfb_panic_nb);
1218
68a2d20b
HZ		 1219 return 0;
1220
1221error:
d21987d7 1222 fb_deferred_io_cleanup(info);
3a6fb6c4 1223 hvfb_putmem(hdev, info);
68a2d20b
HZ		 1224error2:
1225 vmbus_close(hdev->channel);
1226error1:
1227 cancel_delayed_work_sync(&par->dwork);
1228 hv_set_drvdata(hdev, NULL);
1229 framebuffer_release(info);
1230 return ret;
1231}
1232
1233
1234static int hvfb_remove(struct hv_device *hdev)
1235{
1236 struct fb_info *info = hv_get_drvdata(hdev);
1237 struct hvfb_par *par = info->par;
1238
3686fe96
DC		 1239 atomic_notifier_chain_unregister(&panic_notifier_list,
1240 &par->hvfb_panic_nb);
1241
68a2d20b
HZ		 1242 par->update = false;
1243 par->fb_ready = false;
1244
d21987d7
WH		 1245 fb_deferred_io_cleanup(info);
1246
68a2d20b
HZ		 1247 unregister_framebuffer(info);
1248 cancel_delayed_work_sync(&par->dwork);
1249
1250 vmbus_close(hdev->channel);
1251 hv_set_drvdata(hdev, NULL);
1252
3a6fb6c4 1253 hvfb_putmem(hdev, info);
68a2d20b
HZ		 1254 framebuffer_release(info);
1255
1256 return 0;
1257}
1258
1ecf3020
DC		 1259static int hvfb_suspend(struct hv_device *hdev)
1260{
1261 struct fb_info *info = hv_get_drvdata(hdev);
1262 struct hvfb_par *par = info->par;
1263
1264 console_lock();
1265
1266 /* 1 means do suspend */
1267 fb_set_suspend(info, 1);
1268
1269 cancel_delayed_work_sync(&par->dwork);
382a4622 1270 cancel_delayed_work_sync(&info->deferred_work);
1ecf3020
DC		 1271
1272 par->update_saved = par->update;
1273 par->update = false;
1274 par->fb_ready = false;
1275
1276 vmbus_close(hdev->channel);
1277
1278 console_unlock();
1279
1280 return 0;
1281}
1282
1283static int hvfb_resume(struct hv_device *hdev)
1284{
1285 struct fb_info *info = hv_get_drvdata(hdev);
1286 struct hvfb_par *par = info->par;
1287 int ret;
1288
1289 console_lock();
1290
1291 ret = synthvid_connect_vsp(hdev);
1292 if (ret != 0)
1293 goto out;
1294
1295 ret = synthvid_send_config(hdev);
1296 if (ret != 0) {
1297 vmbus_close(hdev->channel);
1298 goto out;
1299 }
1300
1301 par->fb_ready = true;
1302 par->update = par->update_saved;
1303
382a4622 1304 schedule_delayed_work(&info->deferred_work, info->fbdefio->delay);
1ecf3020
DC		 1305 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
1306
1307 /* 0 means do resume */
1308 fb_set_suspend(info, 0);
1309
1310out:
1311 console_unlock();
1312
1313 return ret;
1314}
1315
68a2d20b 1316
9baa3c34 1317static const struct pci_device_id pci_stub_id_table[] = {
7ad96847
GH		 1318 {
1319 .vendor = PCI_VENDOR_ID_MICROSOFT,
1320 .device = PCI_DEVICE_ID_HYPERV_VIDEO,
1321 },
1322 { /* end of list */ }
1323};
1324
68a2d20b
HZ		 1325static const struct hv_vmbus_device_id id_table[] = {
1326 /* Synthetic Video Device GUID */
1327 {HV_SYNTHVID_GUID},
1328 {}
1329};
1330
7ad96847 1331MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
68a2d20b
HZ		 1332MODULE_DEVICE_TABLE(vmbus, id_table);
1333
1334static struct hv_driver hvfb_drv = {
1335 .name = KBUILD_MODNAME,
1336 .id_table = id_table,
1337 .probe = hvfb_probe,
1338 .remove = hvfb_remove,
1ecf3020
DC		 1339 .suspend = hvfb_suspend,
1340 .resume = hvfb_resume,
af0a5646
AV		 1341 .driver = {
1342 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1343 },
68a2d20b
HZ		 1344};
1345
7ad96847
GH		 1346static int hvfb_pci_stub_probe(struct pci_dev *pdev,
1347 const struct pci_device_id *ent)
1348{
1349 return 0;
1350}
1351
1352static void hvfb_pci_stub_remove(struct pci_dev *pdev)
1353{
1354}
1355
1356static struct pci_driver hvfb_pci_stub_driver = {
1357 .name = KBUILD_MODNAME,
1358 .id_table = pci_stub_id_table,
1359 .probe = hvfb_pci_stub_probe,
1360 .remove = hvfb_pci_stub_remove,
af0a5646
AV		 1361 .driver = {
1362 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1363 }
7ad96847 1364};
68a2d20b
HZ		 1365
1366static int __init hvfb_drv_init(void)
1367{
7ad96847
GH		 1368 int ret;
1369
1370 ret = vmbus_driver_register(&hvfb_drv);
1371 if (ret != 0)
1372 return ret;
1373
1374 ret = pci_register_driver(&hvfb_pci_stub_driver);
1375 if (ret != 0) {
1376 vmbus_driver_unregister(&hvfb_drv);
1377 return ret;
1378 }
1379
1380 return 0;
68a2d20b
HZ		 1381}
1382
1383static void __exit hvfb_drv_exit(void)
1384{
7ad96847 1385 pci_unregister_driver(&hvfb_pci_stub_driver);
68a2d20b
HZ		 1386 vmbus_driver_unregister(&hvfb_drv);
1387}
1388
1389module_init(hvfb_drv_init);
1390module_exit(hvfb_drv_exit);
1391
1392MODULE_LICENSE("GPL");
68a2d20b 1393MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver");
Linux 6.x block layer and io_uring tree(s)