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