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