hyperv_fb.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (c) 2012, Microsoft Corporation.
   4 *
   5 * Author:
   6 *   Haiyang Zhang <haiyangz@microsoft.com>
   7 */
   8
   9/*
  10 * Hyper-V Synthetic Video Frame Buffer Driver
  11 *
  12 * This is the driver for the Hyper-V Synthetic Video, which supports
  13 * screen resolution up to Full HD 1920x1080 with 32 bit color on Windows
  14 * Server 2012, and 1600x1200 with 16 bit color on Windows Server 2008 R2
  15 * or earlier.
  16 *
  17 * It also solves the double mouse cursor issue of the emulated video mode.
  18 *
  19 * The default screen resolution is 1152x864, which may be changed by a
  20 * kernel parameter:
  21 *     video=hyperv_fb:<width>x<height>
  22 *     For example: video=hyperv_fb:1280x1024
  23 *
  24 * Portrait orientation is also supported:
  25 *     For example: video=hyperv_fb:864x1152
  26 *
  27 * When a Windows 10 RS5+ host is used, the virtual machine screen
  28 * resolution is obtained from the host. The "video=hyperv_fb" option is
  29 * not needed, but still can be used to overwrite what the host specifies.
  30 * The VM resolution on the host could be set by executing the powershell
  31 * "set-vmvideo" command. For example
  32 *     set-vmvideo -vmname name -horizontalresolution:1920 \
  33 * -verticalresolution:1200 -resolutiontype single
  34 *
  35 * Gen 1 VMs also support direct using VM's physical memory for framebuffer.
  36 * It could improve the efficiency and performance for framebuffer and VM.
  37 * This requires to allocate contiguous physical memory from Linux kernel's
  38 * CMA memory allocator. To enable this, supply a kernel parameter to give
  39 * enough memory space to CMA allocator for framebuffer. For example:
  40 *    cma=130m
  41 * This gives 130MB memory to CMA allocator that can be allocated to
  42 * framebuffer. For reference, 8K resolution (7680x4320) takes about
  43 * 127MB memory.
  44 */
  45
  46#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  47
  48#include <linux/aperture.h>
  49#include <linux/module.h>
  50#include <linux/kernel.h>
  51#include <linux/vmalloc.h>
  52#include <linux/init.h>
  53#include <linux/completion.h>
  54#include <linux/fb.h>
  55#include <linux/pci.h>
  56#include <linux/panic_notifier.h>
  57#include <linux/efi.h>
  58#include <linux/console.h>
  59
  60#include <linux/hyperv.h>
  61
  62/* Hyper-V Synthetic Video Protocol definitions and structures */
  63#define MAX_VMBUS_PKT_SIZE 0x4000
  64
  65#define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
  66/* Support for VERSION_WIN7 is removed. #define is retained for reference. */
  67#define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
  68#define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
  69#define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5)
  70
  71#define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff)
  72#define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16)
  73
  74#define SYNTHVID_DEPTH_WIN8 32
  75#define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
  76
  77enum pipe_msg_type {
  78	PIPE_MSG_INVALID,
  79	PIPE_MSG_DATA,
  80	PIPE_MSG_MAX
  81};
  82
  83struct pipe_msg_hdr {
  84	u32 type;
  85	u32 size; /* size of message after this field */
  86} __packed;
  87
  88
  89enum synthvid_msg_type {
  90	SYNTHVID_ERROR			= 0,
  91	SYNTHVID_VERSION_REQUEST	= 1,
  92	SYNTHVID_VERSION_RESPONSE	= 2,
  93	SYNTHVID_VRAM_LOCATION		= 3,
  94	SYNTHVID_VRAM_LOCATION_ACK	= 4,
  95	SYNTHVID_SITUATION_UPDATE	= 5,
  96	SYNTHVID_SITUATION_UPDATE_ACK	= 6,
  97	SYNTHVID_POINTER_POSITION	= 7,
  98	SYNTHVID_POINTER_SHAPE		= 8,
  99	SYNTHVID_FEATURE_CHANGE		= 9,
 100	SYNTHVID_DIRT			= 10,
 101	SYNTHVID_RESOLUTION_REQUEST	= 13,
 102	SYNTHVID_RESOLUTION_RESPONSE	= 14,
 103
 104	SYNTHVID_MAX			= 15
 105};
 106
 107#define		SYNTHVID_EDID_BLOCK_SIZE	128
 108#define		SYNTHVID_MAX_RESOLUTION_COUNT	64
 109
 110struct hvd_screen_info {
 111	u16 width;
 112	u16 height;
 113} __packed;
 114
 115struct synthvid_msg_hdr {
 116	u32 type;
 117	u32 size;  /* size of this header + payload after this field*/
 118} __packed;
 119
 120struct synthvid_version_req {
 121	u32 version;
 122} __packed;
 123
 124struct synthvid_version_resp {
 125	u32 version;
 126	u8 is_accepted;
 127	u8 max_video_outputs;
 128} __packed;
 129
 130struct synthvid_supported_resolution_req {
 131	u8 maximum_resolution_count;
 132} __packed;
 133
 134struct synthvid_supported_resolution_resp {
 135	u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE];
 136	u8 resolution_count;
 137	u8 default_resolution_index;
 138	u8 is_standard;
 139	struct hvd_screen_info
 140		supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT];
 141} __packed;
 142
 143struct synthvid_vram_location {
 144	u64 user_ctx;
 145	u8 is_vram_gpa_specified;
 146	u64 vram_gpa;
 147} __packed;
 148
 149struct synthvid_vram_location_ack {
 150	u64 user_ctx;
 151} __packed;
 152
 153struct video_output_situation {
 154	u8 active;
 155	u32 vram_offset;
 156	u8 depth_bits;
 157	u32 width_pixels;
 158	u32 height_pixels;
 159	u32 pitch_bytes;
 160} __packed;
 161
 162struct synthvid_situation_update {
 163	u64 user_ctx;
 164	u8 video_output_count;
 165	struct video_output_situation video_output[1];
 166} __packed;
 167
 168struct synthvid_situation_update_ack {
 169	u64 user_ctx;
 170} __packed;
 171
 172struct synthvid_pointer_position {
 173	u8 is_visible;
 174	u8 video_output;
 175	s32 image_x;
 176	s32 image_y;
 177} __packed;
 178
 179
 180#define CURSOR_MAX_X 96
 181#define CURSOR_MAX_Y 96
 182#define CURSOR_ARGB_PIXEL_SIZE 4
 183#define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE)
 184#define CURSOR_COMPLETE (-1)
 185
 186struct synthvid_pointer_shape {
 187	u8 part_idx;
 188	u8 is_argb;
 189	u32 width; /* CURSOR_MAX_X at most */
 190	u32 height; /* CURSOR_MAX_Y at most */
 191	u32 hot_x; /* hotspot relative to upper-left of pointer image */
 192	u32 hot_y;
 193	u8 data[4];
 194} __packed;
 195
 196struct synthvid_feature_change {
 197	u8 is_dirt_needed;
 198	u8 is_ptr_pos_needed;
 199	u8 is_ptr_shape_needed;
 200	u8 is_situ_needed;
 201} __packed;
 202
 203struct rect {
 204	s32 x1, y1; /* top left corner */
 205	s32 x2, y2; /* bottom right corner, exclusive */
 206} __packed;
 207
 208struct synthvid_dirt {
 209	u8 video_output;
 210	u8 dirt_count;
 211	struct rect rect[1];
 212} __packed;
 213
 214struct synthvid_msg {
 215	struct pipe_msg_hdr pipe_hdr;
 216	struct synthvid_msg_hdr vid_hdr;
 217	union {
 218		struct synthvid_version_req ver_req;
 219		struct synthvid_version_resp ver_resp;
 220		struct synthvid_vram_location vram;
 221		struct synthvid_vram_location_ack vram_ack;
 222		struct synthvid_situation_update situ;
 223		struct synthvid_situation_update_ack situ_ack;
 224		struct synthvid_pointer_position ptr_pos;
 225		struct synthvid_pointer_shape ptr_shape;
 226		struct synthvid_feature_change feature_chg;
 227		struct synthvid_dirt dirt;
 228		struct synthvid_supported_resolution_req resolution_req;
 229		struct synthvid_supported_resolution_resp resolution_resp;
 230	};
 231} __packed;
 232
 233
 234/* FB driver definitions and structures */
 235#define HVFB_WIDTH 1152 /* default screen width */
 236#define HVFB_HEIGHT 864 /* default screen height */
 237#define HVFB_WIDTH_MIN 640
 238#define HVFB_HEIGHT_MIN 480
 239
 240#define RING_BUFSIZE (256 * 1024)
 241#define VSP_TIMEOUT (10 * HZ)
 242#define HVFB_UPDATE_DELAY (HZ / 20)
 243#define HVFB_ONDEMAND_THROTTLE (HZ / 20)
 244
 245struct hvfb_par {
 246	struct fb_info *info;
 247	struct resource *mem;
 248	bool fb_ready; /* fb device is ready */
 249	struct completion wait;
 250	u32 synthvid_version;
 251
 252	struct delayed_work dwork;
 253	bool update;
 254	bool update_saved; /* The value of 'update' before hibernation */
 255
 256	u32 pseudo_palette[16];
 257	u8 init_buf[MAX_VMBUS_PKT_SIZE];
 258	u8 recv_buf[MAX_VMBUS_PKT_SIZE];
 259
 260	/* If true, the VSC notifies the VSP on every framebuffer change */
 261	bool synchronous_fb;
 262
 263	/* If true, need to copy from deferred IO mem to framebuffer mem */
 264	bool need_docopy;
 265
 266	struct notifier_block hvfb_panic_nb;
 267
 268	/* Memory for deferred IO and frame buffer itself */
 269	unsigned char *dio_vp;
 270	unsigned char *mmio_vp;
 271	phys_addr_t mmio_pp;
 272
 273	/* Dirty rectangle, protected by delayed_refresh_lock */
 274	int x1, y1, x2, y2;
 275	bool delayed_refresh;
 276	spinlock_t delayed_refresh_lock;
 277};
 278
 279static uint screen_width = HVFB_WIDTH;
 280static uint screen_height = HVFB_HEIGHT;
 281static uint screen_depth;
 282static uint screen_fb_size;
 283static uint dio_fb_size; /* FB size for deferred IO */
 284
 285static void hvfb_putmem(struct fb_info *info);
 286
 287/* Send message to Hyper-V host */
 288static inline int synthvid_send(struct hv_device *hdev,
 289				struct synthvid_msg *msg)
 290{
 291	static atomic64_t request_id = ATOMIC64_INIT(0);
 292	int ret;
 293
 294	msg->pipe_hdr.type = PIPE_MSG_DATA;
 295	msg->pipe_hdr.size = msg->vid_hdr.size;
 296
 297	ret = vmbus_sendpacket(hdev->channel, msg,
 298			       msg->vid_hdr.size + sizeof(struct pipe_msg_hdr),
 299			       atomic64_inc_return(&request_id),
 300			       VM_PKT_DATA_INBAND, 0);
 301
 302	if (ret)
 303		pr_err_ratelimited("Unable to send packet via vmbus; error %d\n", ret);
 304
 305	return ret;
 306}
 307
 308
 309/* Send screen resolution info to host */
 310static int synthvid_send_situ(struct hv_device *hdev)
 311{
 312	struct fb_info *info = hv_get_drvdata(hdev);
 313	struct synthvid_msg msg;
 314
 315	if (!info)
 316		return -ENODEV;
 317
 318	memset(&msg, 0, sizeof(struct synthvid_msg));
 319
 320	msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
 321	msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 322		sizeof(struct synthvid_situation_update);
 323	msg.situ.user_ctx = 0;
 324	msg.situ.video_output_count = 1;
 325	msg.situ.video_output[0].active = 1;
 326	msg.situ.video_output[0].vram_offset = 0;
 327	msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel;
 328	msg.situ.video_output[0].width_pixels = info->var.xres;
 329	msg.situ.video_output[0].height_pixels = info->var.yres;
 330	msg.situ.video_output[0].pitch_bytes = info->fix.line_length;
 331
 332	synthvid_send(hdev, &msg);
 333
 334	return 0;
 335}
 336
 337/* Send mouse pointer info to host */
 338static int synthvid_send_ptr(struct hv_device *hdev)
 339{
 340	struct synthvid_msg msg;
 341
 342	memset(&msg, 0, sizeof(struct synthvid_msg));
 343	msg.vid_hdr.type = SYNTHVID_POINTER_POSITION;
 344	msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 345		sizeof(struct synthvid_pointer_position);
 346	msg.ptr_pos.is_visible = 1;
 347	msg.ptr_pos.video_output = 0;
 348	msg.ptr_pos.image_x = 0;
 349	msg.ptr_pos.image_y = 0;
 350	synthvid_send(hdev, &msg);
 351
 352	memset(&msg, 0, sizeof(struct synthvid_msg));
 353	msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE;
 354	msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 355		sizeof(struct synthvid_pointer_shape);
 356	msg.ptr_shape.part_idx = CURSOR_COMPLETE;
 357	msg.ptr_shape.is_argb = 1;
 358	msg.ptr_shape.width = 1;
 359	msg.ptr_shape.height = 1;
 360	msg.ptr_shape.hot_x = 0;
 361	msg.ptr_shape.hot_y = 0;
 362	msg.ptr_shape.data[0] = 0;
 363	msg.ptr_shape.data[1] = 1;
 364	msg.ptr_shape.data[2] = 1;
 365	msg.ptr_shape.data[3] = 1;
 366	synthvid_send(hdev, &msg);
 367
 368	return 0;
 369}
 370
 371/* Send updated screen area (dirty rectangle) location to host */
 372static int
 373synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2)
 374{
 375	struct hv_device *hdev = device_to_hv_device(info->device);
 376	struct synthvid_msg msg;
 377
 378	memset(&msg, 0, sizeof(struct synthvid_msg));
 379	if (x2 == INT_MAX)
 380		x2 = info->var.xres;
 381	if (y2 == INT_MAX)
 382		y2 = info->var.yres;
 383
 384	msg.vid_hdr.type = SYNTHVID_DIRT;
 385	msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 386		sizeof(struct synthvid_dirt);
 387	msg.dirt.video_output = 0;
 388	msg.dirt.dirt_count = 1;
 389	msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1;
 390	msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1;
 391	msg.dirt.rect[0].x2 =
 392		(x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2;
 393	msg.dirt.rect[0].y2 =
 394		(y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2;
 395
 396	synthvid_send(hdev, &msg);
 397
 398	return 0;
 399}
 400
 401static void hvfb_docopy(struct hvfb_par *par,
 402			unsigned long offset,
 403			unsigned long size)
 404{
 405	if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready ||
 406	    size == 0 || offset >= dio_fb_size)
 407		return;
 408
 409	if (offset + size > dio_fb_size)
 410		size = dio_fb_size - offset;
 411
 412	memcpy(par->mmio_vp + offset, par->dio_vp + offset, size);
 413}
 414
 415/* Deferred IO callback */
 416static void synthvid_deferred_io(struct fb_info *p, struct list_head *pagereflist)
 417{
 418	struct hvfb_par *par = p->par;
 419	struct fb_deferred_io_pageref *pageref;
 420	unsigned long start, end;
 421	int y1, y2, miny, maxy;
 422
 423	miny = INT_MAX;
 424	maxy = 0;
 425
 426	/*
 427	 * Merge dirty pages. It is possible that last page cross
 428	 * over the end of frame buffer row yres. This is taken care of
 429	 * in synthvid_update function by clamping the y2
 430	 * value to yres.
 431	 */
 432	list_for_each_entry(pageref, pagereflist, list) {
 433		start = pageref->offset;
 434		end = start + PAGE_SIZE - 1;
 435		y1 = start / p->fix.line_length;
 436		y2 = end / p->fix.line_length;
 437		miny = min_t(int, miny, y1);
 438		maxy = max_t(int, maxy, y2);
 439
 440		/* Copy from dio space to mmio address */
 441		if (par->fb_ready && par->need_docopy)
 442			hvfb_docopy(par, start, PAGE_SIZE);
 443	}
 444
 445	if (par->fb_ready && par->update)
 446		synthvid_update(p, 0, miny, p->var.xres, maxy + 1);
 447}
 448
 449static struct fb_deferred_io synthvid_defio = {
 450	.delay		= HZ / 20,
 451	.deferred_io	= synthvid_deferred_io,
 452};
 453
 454/*
 455 * Actions on received messages from host:
 456 * Complete the wait event.
 457 * Or, reply with screen and cursor info.
 458 */
 459static void synthvid_recv_sub(struct hv_device *hdev)
 460{
 461	struct fb_info *info = hv_get_drvdata(hdev);
 462	struct hvfb_par *par;
 463	struct synthvid_msg *msg;
 464
 465	if (!info)
 466		return;
 467
 468	par = info->par;
 469	msg = (struct synthvid_msg *)par->recv_buf;
 470
 471	/* Complete the wait event */
 472	if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
 473	    msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE ||
 474	    msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
 475		memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE);
 476		complete(&par->wait);
 477		return;
 478	}
 479
 480	/* Reply with screen and cursor info */
 481	if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) {
 482		if (par->fb_ready) {
 483			synthvid_send_ptr(hdev);
 484			synthvid_send_situ(hdev);
 485		}
 486
 487		par->update = msg->feature_chg.is_dirt_needed;
 488		if (par->update)
 489			schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
 490	}
 491}
 492
 493/* Receive callback for messages from the host */
 494static void synthvid_receive(void *ctx)
 495{
 496	struct hv_device *hdev = ctx;
 497	struct fb_info *info = hv_get_drvdata(hdev);
 498	struct hvfb_par *par;
 499	struct synthvid_msg *recv_buf;
 500	u32 bytes_recvd;
 501	u64 req_id;
 502	int ret;
 503
 504	if (!info)
 505		return;
 506
 507	par = info->par;
 508	recv_buf = (struct synthvid_msg *)par->recv_buf;
 509
 510	do {
 511		ret = vmbus_recvpacket(hdev->channel, recv_buf,
 512				       MAX_VMBUS_PKT_SIZE,
 513				       &bytes_recvd, &req_id);
 514		if (bytes_recvd > 0 &&
 515		    recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
 516			synthvid_recv_sub(hdev);
 517	} while (bytes_recvd > 0 && ret == 0);
 518}
 519
 520/* Check if the ver1 version is equal or greater than ver2 */
 521static inline bool synthvid_ver_ge(u32 ver1, u32 ver2)
 522{
 523	if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) ||
 524	    (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) &&
 525	     SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2)))
 526		return true;
 527
 528	return false;
 529}
 530
 531/* Check synthetic video protocol version with the host */
 532static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver)
 533{
 534	struct fb_info *info = hv_get_drvdata(hdev);
 535	struct hvfb_par *par = info->par;
 536	struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
 537	int ret = 0;
 538	unsigned long t;
 539
 540	memset(msg, 0, sizeof(struct synthvid_msg));
 541	msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
 542	msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 543		sizeof(struct synthvid_version_req);
 544	msg->ver_req.version = ver;
 545	synthvid_send(hdev, msg);
 546
 547	t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
 548	if (!t) {
 549		pr_err("Time out on waiting version response\n");
 550		ret = -ETIMEDOUT;
 551		goto out;
 552	}
 553	if (!msg->ver_resp.is_accepted) {
 554		ret = -ENODEV;
 555		goto out;
 556	}
 557
 558	par->synthvid_version = ver;
 559	pr_info("Synthvid Version major %d, minor %d\n",
 560		SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver));
 561
 562out:
 563	return ret;
 564}
 565
 566/* Get current resolution from the host */
 567static int synthvid_get_supported_resolution(struct hv_device *hdev)
 568{
 569	struct fb_info *info = hv_get_drvdata(hdev);
 570	struct hvfb_par *par = info->par;
 571	struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
 572	int ret = 0;
 573	unsigned long t;
 574	u8 index;
 575
 576	memset(msg, 0, sizeof(struct synthvid_msg));
 577	msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST;
 578	msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 579		sizeof(struct synthvid_supported_resolution_req);
 580
 581	msg->resolution_req.maximum_resolution_count =
 582		SYNTHVID_MAX_RESOLUTION_COUNT;
 583	synthvid_send(hdev, msg);
 584
 585	t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
 586	if (!t) {
 587		pr_err("Time out on waiting resolution response\n");
 588		ret = -ETIMEDOUT;
 589		goto out;
 590	}
 591
 592	if (msg->resolution_resp.resolution_count == 0) {
 593		pr_err("No supported resolutions\n");
 594		ret = -ENODEV;
 595		goto out;
 596	}
 597
 598	index = msg->resolution_resp.default_resolution_index;
 599	if (index >= msg->resolution_resp.resolution_count) {
 600		pr_err("Invalid resolution index: %d\n", index);
 601		ret = -ENODEV;
 602		goto out;
 603	}
 604
 605	screen_width =
 606		msg->resolution_resp.supported_resolution[index].width;
 607	screen_height =
 608		msg->resolution_resp.supported_resolution[index].height;
 609
 610out:
 611	return ret;
 612}
 613
 614/* Connect to VSP (Virtual Service Provider) on host */
 615static int synthvid_connect_vsp(struct hv_device *hdev)
 616{
 617	struct fb_info *info = hv_get_drvdata(hdev);
 618	struct hvfb_par *par = info->par;
 619	int ret;
 620
 621	ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE,
 622			 NULL, 0, synthvid_receive, hdev);
 623	if (ret) {
 624		pr_err("Unable to open vmbus channel\n");
 625		return ret;
 626	}
 627
 628	/* Negotiate the protocol version with host */
 629	switch (vmbus_proto_version) {
 630	case VERSION_WIN10:
 631	case VERSION_WIN10_V5:
 632		ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
 633		if (!ret)
 634			break;
 635		fallthrough;
 636	case VERSION_WIN8:
 637	case VERSION_WIN8_1:
 638		ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8);
 639		break;
 640	default:
 641		ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
 642		break;
 643	}
 644
 645	if (ret) {
 646		pr_err("Synthetic video device version not accepted\n");
 647		goto error;
 648	}
 649
 650	screen_depth = SYNTHVID_DEPTH_WIN8;
 651	if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) {
 652		ret = synthvid_get_supported_resolution(hdev);
 653		if (ret)
 654			pr_info("Failed to get supported resolution from host, use default\n");
 655	}
 656
 657	screen_fb_size = hdev->channel->offermsg.offer.
 658				mmio_megabytes * 1024 * 1024;
 659
 660	return 0;
 661
 662error:
 663	vmbus_close(hdev->channel);
 664	return ret;
 665}
 666
 667/* Send VRAM and Situation messages to the host */
 668static int synthvid_send_config(struct hv_device *hdev)
 669{
 670	struct fb_info *info = hv_get_drvdata(hdev);
 671	struct hvfb_par *par = info->par;
 672	struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
 673	int ret = 0;
 674	unsigned long t;
 675
 676	/* Send VRAM location */
 677	memset(msg, 0, sizeof(struct synthvid_msg));
 678	msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
 679	msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 680		sizeof(struct synthvid_vram_location);
 681	msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp;
 682	msg->vram.is_vram_gpa_specified = 1;
 683	synthvid_send(hdev, msg);
 684
 685	t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
 686	if (!t) {
 687		pr_err("Time out on waiting vram location ack\n");
 688		ret = -ETIMEDOUT;
 689		goto out;
 690	}
 691	if (msg->vram_ack.user_ctx != par->mmio_pp) {
 692		pr_err("Unable to set VRAM location\n");
 693		ret = -ENODEV;
 694		goto out;
 695	}
 696
 697	/* Send pointer and situation update */
 698	synthvid_send_ptr(hdev);
 699	synthvid_send_situ(hdev);
 700
 701out:
 702	return ret;
 703}
 704
 705
 706/*
 707 * Delayed work callback:
 708 * It is scheduled to call whenever update request is received and it has
 709 * not been called in last HVFB_ONDEMAND_THROTTLE time interval.
 710 */
 711static void hvfb_update_work(struct work_struct *w)
 712{
 713	struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work);
 714	struct fb_info *info = par->info;
 715	unsigned long flags;
 716	int x1, x2, y1, y2;
 717	int j;
 718
 719	spin_lock_irqsave(&par->delayed_refresh_lock, flags);
 720	/* Reset the request flag */
 721	par->delayed_refresh = false;
 722
 723	/* Store the dirty rectangle to local variables */
 724	x1 = par->x1;
 725	x2 = par->x2;
 726	y1 = par->y1;
 727	y2 = par->y2;
 728
 729	/* Clear dirty rectangle */
 730	par->x1 = par->y1 = INT_MAX;
 731	par->x2 = par->y2 = 0;
 732
 733	spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
 734
 735	if (x1 > info->var.xres || x2 > info->var.xres ||
 736	    y1 > info->var.yres || y2 > info->var.yres || x2 <= x1)
 737		return;
 738
 739	/* Copy the dirty rectangle to frame buffer memory */
 740	if (par->need_docopy)
 741		for (j = y1; j < y2; j++)
 742			hvfb_docopy(par,
 743				    j * info->fix.line_length +
 744				    (x1 * screen_depth / 8),
 745				    (x2 - x1) * screen_depth / 8);
 746
 747	/* Refresh */
 748	if (par->fb_ready && par->update)
 749		synthvid_update(info, x1, y1, x2, y2);
 750}
 751
 752/*
 753 * Control the on-demand refresh frequency. It schedules a delayed
 754 * screen update if it has not yet.
 755 */
 756static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par,
 757					   int x1, int y1, int w, int h)
 758{
 759	unsigned long flags;
 760	int x2 = x1 + w;
 761	int y2 = y1 + h;
 762
 763	spin_lock_irqsave(&par->delayed_refresh_lock, flags);
 764
 765	/* Merge dirty rectangle */
 766	par->x1 = min_t(int, par->x1, x1);
 767	par->y1 = min_t(int, par->y1, y1);
 768	par->x2 = max_t(int, par->x2, x2);
 769	par->y2 = max_t(int, par->y2, y2);
 770
 771	/* Schedule a delayed screen update if not yet */
 772	if (par->delayed_refresh == false) {
 773		schedule_delayed_work(&par->dwork,
 774				      HVFB_ONDEMAND_THROTTLE);
 775		par->delayed_refresh = true;
 776	}
 777
 778	spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
 779}
 780
 781static int hvfb_on_panic(struct notifier_block *nb,
 782			 unsigned long e, void *p)
 783{
 784	struct hv_device *hdev;
 785	struct hvfb_par *par;
 786	struct fb_info *info;
 787
 788	par = container_of(nb, struct hvfb_par, hvfb_panic_nb);
 789	info = par->info;
 790	hdev = device_to_hv_device(info->device);
 791
 792	if (hv_ringbuffer_spinlock_busy(hdev->channel))
 793		return NOTIFY_DONE;
 794
 795	par->synchronous_fb = true;
 796	if (par->need_docopy)
 797		hvfb_docopy(par, 0, dio_fb_size);
 798	synthvid_update(info, 0, 0, INT_MAX, INT_MAX);
 799
 800	return NOTIFY_DONE;
 801}
 802
 803/* Framebuffer operation handlers */
 804
 805static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 806{
 807	if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN ||
 808	    var->xres > screen_width || var->yres >  screen_height ||
 809	    var->bits_per_pixel != screen_depth)
 810		return -EINVAL;
 811
 812	var->xres_virtual = var->xres;
 813	var->yres_virtual = var->yres;
 814
 815	return 0;
 816}
 817
 818static int hvfb_set_par(struct fb_info *info)
 819{
 820	struct hv_device *hdev = device_to_hv_device(info->device);
 821
 822	return synthvid_send_situ(hdev);
 823}
 824
 825
 826static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf)
 827{
 828	return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
 829}
 830
 831static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 832			  unsigned blue, unsigned transp, struct fb_info *info)
 833{
 834	u32 *pal = info->pseudo_palette;
 835
 836	if (regno > 15)
 837		return -EINVAL;
 838
 839	pal[regno] = chan_to_field(red, &info->var.red)
 840		| chan_to_field(green, &info->var.green)
 841		| chan_to_field(blue, &info->var.blue)
 842		| chan_to_field(transp, &info->var.transp);
 843
 844	return 0;
 845}
 846
 847static int hvfb_blank(int blank, struct fb_info *info)
 848{
 849	return 1;	/* get fb_blank to set the colormap to all black */
 850}
 851
 852static void hvfb_ops_damage_range(struct fb_info *info, off_t off, size_t len)
 853{
 854	/* TODO: implement damage handling */
 855}
 856
 857static void hvfb_ops_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height)
 858{
 859	struct hvfb_par *par = info->par;
 860
 861	if (par->synchronous_fb)
 862		synthvid_update(info, 0, 0, INT_MAX, INT_MAX);
 863	else
 864		hvfb_ondemand_refresh_throttle(par, x, y, width, height);
 865}
 866
 867/*
 868 * fb_ops.fb_destroy is called by the last put_fb_info() call at the end
 869 * of unregister_framebuffer() or fb_release(). Do any cleanup related to
 870 * framebuffer here.
 871 */
 872static void hvfb_destroy(struct fb_info *info)
 873{
 874	hvfb_putmem(info);
 875	framebuffer_release(info);
 876}
 877
 878/*
 879 * TODO: GEN1 codepaths allocate from system or DMA-able memory. Fix the
 880 *       driver to use the _SYSMEM_ or _DMAMEM_ helpers in these cases.
 881 */
 882FB_GEN_DEFAULT_DEFERRED_IOMEM_OPS(hvfb_ops,
 883				  hvfb_ops_damage_range,
 884				  hvfb_ops_damage_area)
 885
 886static const struct fb_ops hvfb_ops = {
 887	.owner = THIS_MODULE,
 888	FB_DEFAULT_DEFERRED_OPS(hvfb_ops),
 889	.fb_check_var = hvfb_check_var,
 890	.fb_set_par = hvfb_set_par,
 891	.fb_setcolreg = hvfb_setcolreg,
 892	.fb_blank = hvfb_blank,
 893	.fb_destroy	= hvfb_destroy,
 894};
 895
 896/* Get options from kernel paramenter "video=" */
 897static void hvfb_get_option(struct fb_info *info)
 898{
 899	struct hvfb_par *par = info->par;
 900	char *opt = NULL, *p;
 901	uint x = 0, y = 0;
 902
 903	if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt)
 904		return;
 905
 906	p = strsep(&opt, "x");
 907	if (!*p || kstrtouint(p, 0, &x) ||
 908	    !opt || !*opt || kstrtouint(opt, 0, &y)) {
 909		pr_err("Screen option is invalid: skipped\n");
 910		return;
 911	}
 912
 913	if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN ||
 914	    (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) &&
 915	    (x * y * screen_depth / 8 > screen_fb_size)) ||
 916	    (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
 917	     x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8)) {
 918		pr_err("Screen resolution option is out of range: skipped\n");
 919		return;
 920	}
 921
 922	screen_width = x;
 923	screen_height = y;
 924	return;
 925}
 926
 927/*
 928 * Allocate enough contiguous physical memory.
 929 * Return physical address if succeeded or -1 if failed.
 930 */
 931static phys_addr_t hvfb_get_phymem(struct hv_device *hdev,
 932				   unsigned int request_size)
 933{
 934	struct page *page = NULL;
 935	dma_addr_t dma_handle;
 936	void *vmem;
 937	phys_addr_t paddr = 0;
 938	unsigned int order = get_order(request_size);
 939
 940	if (request_size == 0)
 941		return -1;
 942
 943	if (order <= MAX_PAGE_ORDER) {
 944		/* Call alloc_pages if the size is less than 2^MAX_PAGE_ORDER */
 945		page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
 946		if (!page)
 947			return -1;
 948
 949		paddr = (page_to_pfn(page) << PAGE_SHIFT);
 950	} else {
 951		/* Allocate from CMA */
 952		hdev->device.coherent_dma_mask = DMA_BIT_MASK(64);
 953
 954		vmem = dma_alloc_coherent(&hdev->device,
 955					  round_up(request_size, PAGE_SIZE),
 956					  &dma_handle,
 957					  GFP_KERNEL | __GFP_NOWARN);
 958
 959		if (!vmem)
 960			return -1;
 961
 962		paddr = virt_to_phys(vmem);
 963	}
 964
 965	return paddr;
 966}
 967
 968/* Release contiguous physical memory */
 969static void hvfb_release_phymem(struct device *device,
 970				phys_addr_t paddr, unsigned int size)
 971{
 972	unsigned int order = get_order(size);
 973
 974	if (order <= MAX_PAGE_ORDER)
 975		__free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order);
 976	else
 977		dma_free_coherent(device,
 978				  round_up(size, PAGE_SIZE),
 979				  phys_to_virt(paddr),
 980				  paddr);
 981}
 982
 983
 984/* Get framebuffer memory from Hyper-V video pci space */
 985static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
 986{
 987	struct hvfb_par *par = info->par;
 988	struct pci_dev *pdev  = NULL;
 989	void __iomem *fb_virt;
 990	int gen2vm = efi_enabled(EFI_BOOT);
 991	resource_size_t base = 0;
 992	resource_size_t size = 0;
 993	phys_addr_t paddr;
 994	int ret;
 995
 996	if (!gen2vm) {
 997		pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
 998			PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
 999		if (!pdev) {
1000			pr_err("Unable to find PCI Hyper-V video\n");
1001			return -ENODEV;
1002		}
1003
1004		base = pci_resource_start(pdev, 0);
1005		size = pci_resource_len(pdev, 0);
1006		aperture_remove_conflicting_devices(base, size, KBUILD_MODNAME);
1007
1008		/*
1009		 * For Gen 1 VM, we can directly use the contiguous memory
1010		 * from VM. If we succeed, deferred IO happens directly
1011		 * on this allocated framebuffer memory, avoiding extra
1012		 * memory copy.
1013		 */
1014		paddr = hvfb_get_phymem(hdev, screen_fb_size);
1015		if (paddr != (phys_addr_t) -1) {
1016			par->mmio_pp = paddr;
1017			par->mmio_vp = par->dio_vp = __va(paddr);
1018
1019			info->fix.smem_start = paddr;
1020			info->fix.smem_len = screen_fb_size;
1021			info->screen_base = par->mmio_vp;
1022			info->screen_size = screen_fb_size;
1023
1024			par->need_docopy = false;
1025			goto getmem_done;
1026		}
1027		pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n");
1028	} else {
1029		aperture_remove_all_conflicting_devices(KBUILD_MODNAME);
1030	}
1031
1032	/*
1033	 * Cannot use contiguous physical memory, so allocate MMIO space for
1034	 * the framebuffer. At this point in the function, conflicting devices
1035	 * that might have claimed the framebuffer MMIO space based on
1036	 * screen_info.lfb_base must have already been removed so that
1037	 * vmbus_allocate_mmio() does not allocate different MMIO space. If the
1038	 * kdump image were to be loaded using kexec_file_load(), the
1039	 * framebuffer location in the kdump image would be set from
1040	 * screen_info.lfb_base at the time that kdump is enabled. If the
1041	 * framebuffer has moved elsewhere, this could be the wrong location,
1042	 * causing kdump to hang when efifb (for example) loads.
1043	 */
1044	dio_fb_size =
1045		screen_width * screen_height * screen_depth / 8;
1046
1047	ret = vmbus_allocate_mmio(&par->mem, hdev, 0, -1,
1048				  screen_fb_size, 0x100000, true);
1049	if (ret != 0) {
1050		pr_err("Unable to allocate framebuffer memory\n");
1051		goto err1;
1052	}
1053
1054	/*
1055	 * Map the VRAM cacheable for performance. This is also required for
1056	 * VM Connect to display properly for ARM64 Linux VM, as the host also
1057	 * maps the VRAM cacheable.
1058	 */
1059	fb_virt = ioremap_cache(par->mem->start, screen_fb_size);
1060	if (!fb_virt)
1061		goto err2;
1062
1063	/* Allocate memory for deferred IO */
1064	par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE));
1065	if (par->dio_vp == NULL)
1066		goto err3;
1067
1068	/* Physical address of FB device */
1069	par->mmio_pp = par->mem->start;
1070	/* Virtual address of FB device */
1071	par->mmio_vp = (unsigned char *) fb_virt;
1072
1073	info->fix.smem_start = par->mem->start;
1074	info->fix.smem_len = dio_fb_size;
1075	info->screen_base = par->dio_vp;
1076	info->screen_size = dio_fb_size;
1077
1078getmem_done:
1079	if (!gen2vm)
1080		pci_dev_put(pdev);
1081
1082	return 0;
1083
1084err3:
1085	iounmap(fb_virt);
1086err2:
1087	vmbus_free_mmio(par->mem->start, screen_fb_size);
1088	par->mem = NULL;
1089err1:
1090	if (!gen2vm)
1091		pci_dev_put(pdev);
1092
1093	return -ENOMEM;
1094}
1095
1096/* Release the framebuffer */
1097static void hvfb_putmem(struct fb_info *info)
1098{
1099	struct hvfb_par *par = info->par;
1100
1101	if (par->need_docopy) {
1102		vfree(par->dio_vp);
1103		iounmap(par->mmio_vp);
1104		vmbus_free_mmio(par->mem->start, screen_fb_size);
1105	} else {
1106		hvfb_release_phymem(info->device, info->fix.smem_start,
1107				    screen_fb_size);
1108	}
1109
1110	par->mem = NULL;
1111}
1112
1113
1114static int hvfb_probe(struct hv_device *hdev,
1115		      const struct hv_vmbus_device_id *dev_id)
1116{
1117	struct fb_info *info;
1118	struct hvfb_par *par;
1119	int ret;
1120
1121	info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device);
1122	if (!info)
1123		return -ENOMEM;
1124
1125	par = info->par;
1126	par->info = info;
1127	par->fb_ready = false;
1128	par->need_docopy = true;
1129	init_completion(&par->wait);
1130	INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
1131
1132	par->delayed_refresh = false;
1133	spin_lock_init(&par->delayed_refresh_lock);
1134	par->x1 = par->y1 = INT_MAX;
1135	par->x2 = par->y2 = 0;
1136
1137	/* Connect to VSP */
1138	hv_set_drvdata(hdev, info);
1139	ret = synthvid_connect_vsp(hdev);
1140	if (ret) {
1141		pr_err("Unable to connect to VSP\n");
1142		goto error1;
1143	}
1144
1145	hvfb_get_option(info);
1146	pr_info("Screen resolution: %dx%d, Color depth: %d, Frame buffer size: %d\n",
1147		screen_width, screen_height, screen_depth, screen_fb_size);
1148
1149	ret = hvfb_getmem(hdev, info);
1150	if (ret) {
1151		pr_err("No memory for framebuffer\n");
1152		goto error2;
1153	}
1154
1155	/* Set up fb_info */
1156	info->var.xres_virtual = info->var.xres = screen_width;
1157	info->var.yres_virtual = info->var.yres = screen_height;
1158	info->var.bits_per_pixel = screen_depth;
1159
1160	if (info->var.bits_per_pixel == 16) {
1161		info->var.red = (struct fb_bitfield){11, 5, 0};
1162		info->var.green = (struct fb_bitfield){5, 6, 0};
1163		info->var.blue = (struct fb_bitfield){0, 5, 0};
1164		info->var.transp = (struct fb_bitfield){0, 0, 0};
1165	} else {
1166		info->var.red = (struct fb_bitfield){16, 8, 0};
1167		info->var.green = (struct fb_bitfield){8, 8, 0};
1168		info->var.blue = (struct fb_bitfield){0, 8, 0};
1169		info->var.transp = (struct fb_bitfield){24, 8, 0};
1170	}
1171
1172	info->var.activate = FB_ACTIVATE_NOW;
1173	info->var.height = -1;
1174	info->var.width = -1;
1175	info->var.vmode = FB_VMODE_NONINTERLACED;
1176
1177	strcpy(info->fix.id, KBUILD_MODNAME);
1178	info->fix.type = FB_TYPE_PACKED_PIXELS;
1179	info->fix.visual = FB_VISUAL_TRUECOLOR;
1180	info->fix.line_length = screen_width * screen_depth / 8;
1181	info->fix.accel = FB_ACCEL_NONE;
1182
1183	info->fbops = &hvfb_ops;
1184	info->pseudo_palette = par->pseudo_palette;
1185
1186	/* Initialize deferred IO */
1187	info->fbdefio = &synthvid_defio;
1188	fb_deferred_io_init(info);
1189
1190	/* Send config to host */
1191	ret = synthvid_send_config(hdev);
1192	if (ret)
1193		goto error;
1194
1195	ret = devm_register_framebuffer(&hdev->device, info);
1196	if (ret) {
1197		pr_err("Unable to register framebuffer\n");
1198		goto error;
1199	}
1200
1201	par->fb_ready = true;
1202
1203	par->synchronous_fb = false;
1204
1205	/*
1206	 * We need to be sure this panic notifier runs _before_ the
1207	 * vmbus disconnect, so order it by priority. It must execute
1208	 * before the function hv_panic_vmbus_unload() [drivers/hv/vmbus_drv.c],
1209	 * which is almost at the end of list, with priority = INT_MIN + 1.
1210	 */
1211	par->hvfb_panic_nb.notifier_call = hvfb_on_panic;
1212	par->hvfb_panic_nb.priority = INT_MIN + 10;
1213	atomic_notifier_chain_register(&panic_notifier_list,
1214				       &par->hvfb_panic_nb);
1215
1216	return 0;
1217
1218error:
1219	fb_deferred_io_cleanup(info);
1220	hvfb_putmem(info);
1221error2:
1222	vmbus_close(hdev->channel);
1223error1:
1224	cancel_delayed_work_sync(&par->dwork);
1225	hv_set_drvdata(hdev, NULL);
1226	framebuffer_release(info);
1227	return ret;
1228}
1229
1230static void hvfb_remove(struct hv_device *hdev)
1231{
1232	struct fb_info *info = hv_get_drvdata(hdev);
1233	struct hvfb_par *par = info->par;
1234
1235	atomic_notifier_chain_unregister(&panic_notifier_list,
1236					 &par->hvfb_panic_nb);
1237
1238	par->update = false;
1239	par->fb_ready = false;
1240
1241	fb_deferred_io_cleanup(info);
1242
1243	cancel_delayed_work_sync(&par->dwork);
1244
1245	vmbus_close(hdev->channel);
1246	hv_set_drvdata(hdev, NULL);
1247}
1248
1249static int hvfb_suspend(struct hv_device *hdev)
1250{
1251	struct fb_info *info = hv_get_drvdata(hdev);
1252	struct hvfb_par *par = info->par;
1253
1254	console_lock();
1255
1256	/* 1 means do suspend */
1257	fb_set_suspend(info, 1);
1258
1259	cancel_delayed_work_sync(&par->dwork);
1260	cancel_delayed_work_sync(&info->deferred_work);
1261
1262	par->update_saved = par->update;
1263	par->update = false;
1264	par->fb_ready = false;
1265
1266	vmbus_close(hdev->channel);
1267
1268	console_unlock();
1269
1270	return 0;
1271}
1272
1273static int hvfb_resume(struct hv_device *hdev)
1274{
1275	struct fb_info *info = hv_get_drvdata(hdev);
1276	struct hvfb_par *par = info->par;
1277	int ret;
1278
1279	console_lock();
1280
1281	ret = synthvid_connect_vsp(hdev);
1282	if (ret != 0)
1283		goto out;
1284
1285	ret = synthvid_send_config(hdev);
1286	if (ret != 0) {
1287		vmbus_close(hdev->channel);
1288		goto out;
1289	}
1290
1291	par->fb_ready = true;
1292	par->update = par->update_saved;
1293
1294	schedule_delayed_work(&info->deferred_work, info->fbdefio->delay);
1295	schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
1296
1297	/* 0 means do resume */
1298	fb_set_suspend(info, 0);
1299
1300out:
1301	console_unlock();
1302
1303	return ret;
1304}
1305
1306
1307static const struct pci_device_id pci_stub_id_table[] = {
1308	{
1309		.vendor      = PCI_VENDOR_ID_MICROSOFT,
1310		.device      = PCI_DEVICE_ID_HYPERV_VIDEO,
1311	},
1312	{ /* end of list */ }
1313};
1314
1315static const struct hv_vmbus_device_id id_table[] = {
1316	/* Synthetic Video Device GUID */
1317	{HV_SYNTHVID_GUID},
1318	{}
1319};
1320
1321MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
1322MODULE_DEVICE_TABLE(vmbus, id_table);
1323
1324static struct hv_driver hvfb_drv = {
1325	.name = KBUILD_MODNAME,
1326	.id_table = id_table,
1327	.probe = hvfb_probe,
1328	.remove = hvfb_remove,
1329	.suspend = hvfb_suspend,
1330	.resume = hvfb_resume,
1331	.driver = {
1332		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1333	},
1334};
1335
1336static int hvfb_pci_stub_probe(struct pci_dev *pdev,
1337			       const struct pci_device_id *ent)
1338{
1339	return 0;
1340}
1341
1342static void hvfb_pci_stub_remove(struct pci_dev *pdev)
1343{
1344}
1345
1346static struct pci_driver hvfb_pci_stub_driver = {
1347	.name =		KBUILD_MODNAME,
1348	.id_table =	pci_stub_id_table,
1349	.probe =	hvfb_pci_stub_probe,
1350	.remove =	hvfb_pci_stub_remove,
1351	.driver = {
1352		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1353	}
1354};
1355
1356static int __init hvfb_drv_init(void)
1357{
1358	int ret;
1359
1360	pr_warn("Deprecated: use Hyper-V DRM driver instead\n");
1361
1362	if (fb_modesetting_disabled("hyper_fb"))
1363		return -ENODEV;
1364
1365	ret = vmbus_driver_register(&hvfb_drv);
1366	if (ret != 0)
1367		return ret;
1368
1369	ret = pci_register_driver(&hvfb_pci_stub_driver);
1370	if (ret != 0) {
1371		vmbus_driver_unregister(&hvfb_drv);
1372		return ret;
1373	}
1374
1375	return 0;
1376}
1377
1378static void __exit hvfb_drv_exit(void)
1379{
1380	pci_unregister_driver(&hvfb_pci_stub_driver);
1381	vmbus_driver_unregister(&hvfb_drv);
1382}
1383
1384module_init(hvfb_drv_init);
1385module_exit(hvfb_drv_exit);
1386
1387MODULE_LICENSE("GPL");
1388MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver");