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