drivers/video/fbdev/hyperv_fb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2012, Microsoft Corporation.
   4  *
   5  * Author:
   6  *   Haiyang Zhang <haiyangz@microsoft.com>
   7  */
   8
   9 /*
  10  * Hyper-V Synthetic Video Frame Buffer Driver
  11  *
  12  * This is the driver for the Hyper-V Synthetic Video, which supports
  13  * screen resolution up to Full HD 1920x1080 with 32 bit color on Windows
  14  * Server 2012, and 1600x1200 with 16 bit color on Windows Server 2008 R2
  15  * or earlier.
  16  *
  17  * It also solves the double mouse cursor issue of the emulated video mode.
  18  *
  19  * The default screen resolution is 1152x864, which may be changed by a
  20  * kernel parameter:
  21  *     video=hyperv_fb:<width>x<height>
  22  *     For example: video=hyperv_fb:1280x1024
  23  *
  24  * Portrait orientation is also supported:
  25  *     For example: video=hyperv_fb:864x1152
  26  *
  27  * When a Windows 10 RS5+ host is used, the virtual machine screen
  28  * resolution is obtained from the host. The "video=hyperv_fb" option is
  29  * not needed, but still can be used to overwrite what the host specifies.
  30  * The VM resolution on the host could be set by executing the powershell
  31  * "set-vmvideo" command. For example
  32  *     set-vmvideo -vmname name -horizontalresolution:1920 \
  33  * -verticalresolution:1200 -resolutiontype single
  34  *
  35  * Gen 1 VMs also support direct using VM's physical memory for framebuffer.
  36  * It could improve the efficiency and performance for framebuffer and VM.
  37  * This requires to allocate contiguous physical memory from Linux kernel's
  38  * CMA memory allocator. To enable this, supply a kernel parameter to give
  39  * enough memory space to CMA allocator for framebuffer. For example:
  40  *    cma=130m
  41  * This gives 130MB memory to CMA allocator that can be allocated to
  42  * framebuffer. For reference, 8K resolution (7680x4320) takes about
  43  * 127MB memory.
  44  */
  45
  46 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  47
  48 #include <linux/module.h>
  49 #include <linux/kernel.h>
  50 #include <linux/vmalloc.h>
  51 #include <linux/init.h>
  52 #include <linux/completion.h>
  53 #include <linux/fb.h>
  54 #include <linux/pci.h>
  55 #include <linux/efi.h>
  56 #include <linux/console.h>
  57
  58 #include <linux/hyperv.h>
  59
  60
  61 /* Hyper-V Synthetic Video Protocol definitions and structures */
  62 #define MAX_VMBUS_PKT_SIZE 0x4000
  63
  64 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
  65 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
  66 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
  67 #define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5)
  68
  69 #define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff)
  70 #define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16)
  71
  72 #define SYNTHVID_DEPTH_WIN7 16
  73 #define SYNTHVID_DEPTH_WIN8 32
  74
  75 #define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024)
  76 #define SYNTHVID_WIDTH_MAX_WIN7 1600
  77 #define SYNTHVID_HEIGHT_MAX_WIN7 1200
  78
  79 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
  80
  81 #define PCI_VENDOR_ID_MICROSOFT 0x1414
  82 #define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353
  83
  84
  85 enum pipe_msg_type {
  86         PIPE_MSG_INVALID,
  87         PIPE_MSG_DATA,
  88         PIPE_MSG_MAX
  89 };
  90
  91 struct pipe_msg_hdr {
  92         u32 type;
  93         u32 size; /* size of message after this field */
  94 } __packed;
  95
  96
  97 enum synthvid_msg_type {
  98         SYNTHVID_ERROR                  = 0,
  99         SYNTHVID_VERSION_REQUEST        = 1,
 100         SYNTHVID_VERSION_RESPONSE       = 2,
 101         SYNTHVID_VRAM_LOCATION          = 3,
 102         SYNTHVID_VRAM_LOCATION_ACK      = 4,
 103         SYNTHVID_SITUATION_UPDATE       = 5,
 104         SYNTHVID_SITUATION_UPDATE_ACK   = 6,
 105         SYNTHVID_POINTER_POSITION       = 7,
 106         SYNTHVID_POINTER_SHAPE          = 8,
 107         SYNTHVID_FEATURE_CHANGE         = 9,
 108         SYNTHVID_DIRT                   = 10,
 109         SYNTHVID_RESOLUTION_REQUEST     = 13,
 110         SYNTHVID_RESOLUTION_RESPONSE    = 14,
 111
 112         SYNTHVID_MAX                    = 15
 113 };
 114
 115 #define         SYNTHVID_EDID_BLOCK_SIZE        128
 116 #define         SYNTHVID_MAX_RESOLUTION_COUNT   64
 117
 118 struct hvd_screen_info {
 119         u16 width;
 120         u16 height;
 121 } __packed;
 122
 123 struct synthvid_msg_hdr {
 124         u32 type;
 125         u32 size;  /* size of this header + payload after this field*/
 126 } __packed;
 127
 128 struct synthvid_version_req {
 129         u32 version;
 130 } __packed;
 131
 132 struct synthvid_version_resp {
 133         u32 version;
 134         u8 is_accepted;
 135         u8 max_video_outputs;
 136 } __packed;
 137
 138 struct synthvid_supported_resolution_req {
 139         u8 maximum_resolution_count;
 140 } __packed;
 141
 142 struct synthvid_supported_resolution_resp {
 143         u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE];
 144         u8 resolution_count;
 145         u8 default_resolution_index;
 146         u8 is_standard;
 147         struct hvd_screen_info
 148                 supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT];
 149 } __packed;
 150
 151 struct synthvid_vram_location {
 152         u64 user_ctx;
 153         u8 is_vram_gpa_specified;
 154         u64 vram_gpa;
 155 } __packed;
 156
 157 struct synthvid_vram_location_ack {
 158         u64 user_ctx;
 159 } __packed;
 160
 161 struct video_output_situation {
 162         u8 active;
 163         u32 vram_offset;
 164         u8 depth_bits;
 165         u32 width_pixels;
 166         u32 height_pixels;
 167         u32 pitch_bytes;
 168 } __packed;
 169
 170 struct synthvid_situation_update {
 171         u64 user_ctx;
 172         u8 video_output_count;
 173         struct video_output_situation video_output[1];
 174 } __packed;
 175
 176 struct synthvid_situation_update_ack {
 177         u64 user_ctx;
 178 } __packed;
 179
 180 struct synthvid_pointer_position {
 181         u8 is_visible;
 182         u8 video_output;
 183         s32 image_x;
 184         s32 image_y;
 185 } __packed;
 186
 187
 188 #define CURSOR_MAX_X 96
 189 #define CURSOR_MAX_Y 96
 190 #define CURSOR_ARGB_PIXEL_SIZE 4
 191 #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE)
 192 #define CURSOR_COMPLETE (-1)
 193
 194 struct synthvid_pointer_shape {
 195         u8 part_idx;
 196         u8 is_argb;
 197         u32 width; /* CURSOR_MAX_X at most */
 198         u32 height; /* CURSOR_MAX_Y at most */
 199         u32 hot_x; /* hotspot relative to upper-left of pointer image */
 200         u32 hot_y;
 201         u8 data[4];
 202 } __packed;
 203
 204 struct synthvid_feature_change {
 205         u8 is_dirt_needed;
 206         u8 is_ptr_pos_needed;
 207         u8 is_ptr_shape_needed;
 208         u8 is_situ_needed;
 209 } __packed;
 210
 211 struct rect {
 212         s32 x1, y1; /* top left corner */
 213         s32 x2, y2; /* bottom right corner, exclusive */
 214 } __packed;
 215
 216 struct synthvid_dirt {
 217         u8 video_output;
 218         u8 dirt_count;
 219         struct rect rect[1];
 220 } __packed;
 221
 222 struct synthvid_msg {
 223         struct pipe_msg_hdr pipe_hdr;
 224         struct synthvid_msg_hdr vid_hdr;
 225         union {
 226                 struct synthvid_version_req ver_req;
 227                 struct synthvid_version_resp ver_resp;
 228                 struct synthvid_vram_location vram;
 229                 struct synthvid_vram_location_ack vram_ack;
 230                 struct synthvid_situation_update situ;
 231                 struct synthvid_situation_update_ack situ_ack;
 232                 struct synthvid_pointer_position ptr_pos;
 233                 struct synthvid_pointer_shape ptr_shape;
 234                 struct synthvid_feature_change feature_chg;
 235                 struct synthvid_dirt dirt;
 236                 struct synthvid_supported_resolution_req resolution_req;
 237                 struct synthvid_supported_resolution_resp resolution_resp;
 238         };
 239 } __packed;
 240
 241
 242 /* FB driver definitions and structures */
 243 #define HVFB_WIDTH 1152 /* default screen width */
 244 #define HVFB_HEIGHT 864 /* default screen height */
 245 #define HVFB_WIDTH_MIN 640
 246 #define HVFB_HEIGHT_MIN 480
 247
 248 #define RING_BUFSIZE (256 * 1024)
 249 #define VSP_TIMEOUT (10 * HZ)
 250 #define HVFB_UPDATE_DELAY (HZ / 20)
 251 #define HVFB_ONDEMAND_THROTTLE (HZ / 20)
 252
 253 struct hvfb_par {
 254         struct fb_info *info;
 255         struct resource *mem;
 256         bool fb_ready; /* fb device is ready */
 257         struct completion wait;
 258         u32 synthvid_version;
 259
 260         struct delayed_work dwork;
 261         bool update;
 262         bool update_saved; /* The value of 'update' before hibernation */
 263
 264         u32 pseudo_palette[16];
 265         u8 init_buf[MAX_VMBUS_PKT_SIZE];
 266         u8 recv_buf[MAX_VMBUS_PKT_SIZE];
 267
 268         /* If true, the VSC notifies the VSP on every framebuffer change */
 269         bool synchronous_fb;
 270
 271         /* If true, need to copy from deferred IO mem to framebuffer mem */
 272         bool need_docopy;
 273
 274         struct notifier_block hvfb_panic_nb;
 275
 276         /* Memory for deferred IO and frame buffer itself */
 277         unsigned char *dio_vp;
 278         unsigned char *mmio_vp;
 279         phys_addr_t mmio_pp;
 280
 281         /* Dirty rectangle, protected by delayed_refresh_lock */
 282         int x1, y1, x2, y2;
 283         bool delayed_refresh;
 284         spinlock_t delayed_refresh_lock;
 285 };
 286
 287 static uint screen_width = HVFB_WIDTH;
 288 static uint screen_height = HVFB_HEIGHT;
 289 static uint screen_width_max = HVFB_WIDTH;
 290 static uint screen_height_max = HVFB_HEIGHT;
 291 static uint screen_depth;
 292 static uint screen_fb_size;
 293 static uint dio_fb_size; /* FB size for deferred IO */
 294
 295 /* Send message to Hyper-V host */
 296 static inline int synthvid_send(struct hv_device *hdev,
 297                                 struct synthvid_msg *msg)
 298 {
 299         static atomic64_t request_id = ATOMIC64_INIT(0);
 300         int ret;
 301
 302         msg->pipe_hdr.type = PIPE_MSG_DATA;
 303         msg->pipe_hdr.size = msg->vid_hdr.size;
 304
 305         ret = vmbus_sendpacket(hdev->channel, msg,
 306                                msg->vid_hdr.size + sizeof(struct pipe_msg_hdr),
 307                                atomic64_inc_return(&request_id),
 308                                VM_PKT_DATA_INBAND, 0);
 309
 310         if (ret)
 311                 pr_err_ratelimited("Unable to send packet via vmbus; error %d\n", ret);
 312
 313         return ret;
 314 }
 315
 316
 317 /* Send screen resolution info to host */
 318 static int synthvid_send_situ(struct hv_device *hdev)
 319 {
 320         struct fb_info *info = hv_get_drvdata(hdev);
 321         struct synthvid_msg msg;
 322
 323         if (!info)
 324                 return -ENODEV;
 325
 326         memset(&msg, 0, sizeof(struct synthvid_msg));
 327
 328         msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
 329         msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 330                 sizeof(struct synthvid_situation_update);
 331         msg.situ.user_ctx = 0;
 332         msg.situ.video_output_count = 1;
 333         msg.situ.video_output[0].active = 1;
 334         msg.situ.video_output[0].vram_offset = 0;
 335         msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel;
 336         msg.situ.video_output[0].width_pixels = info->var.xres;
 337         msg.situ.video_output[0].height_pixels = info->var.yres;
 338         msg.situ.video_output[0].pitch_bytes = info->fix.line_length;
 339
 340         synthvid_send(hdev, &msg);
 341
 342         return 0;
 343 }
 344
 345 /* Send mouse pointer info to host */
 346 static int synthvid_send_ptr(struct hv_device *hdev)
 347 {
 348         struct synthvid_msg msg;
 349
 350         memset(&msg, 0, sizeof(struct synthvid_msg));
 351         msg.vid_hdr.type = SYNTHVID_POINTER_POSITION;
 352         msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 353                 sizeof(struct synthvid_pointer_position);
 354         msg.ptr_pos.is_visible = 1;
 355         msg.ptr_pos.video_output = 0;
 356         msg.ptr_pos.image_x = 0;
 357         msg.ptr_pos.image_y = 0;
 358         synthvid_send(hdev, &msg);
 359
 360         memset(&msg, 0, sizeof(struct synthvid_msg));
 361         msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE;
 362         msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 363                 sizeof(struct synthvid_pointer_shape);
 364         msg.ptr_shape.part_idx = CURSOR_COMPLETE;
 365         msg.ptr_shape.is_argb = 1;
 366         msg.ptr_shape.width = 1;
 367         msg.ptr_shape.height = 1;
 368         msg.ptr_shape.hot_x = 0;
 369         msg.ptr_shape.hot_y = 0;
 370         msg.ptr_shape.data[0] = 0;
 371         msg.ptr_shape.data[1] = 1;
 372         msg.ptr_shape.data[2] = 1;
 373         msg.ptr_shape.data[3] = 1;
 374         synthvid_send(hdev, &msg);
 375
 376         return 0;
 377 }
 378
 379 /* Send updated screen area (dirty rectangle) location to host */
 380 static int
 381 synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2)
 382 {
 383         struct hv_device *hdev = device_to_hv_device(info->device);
 384         struct synthvid_msg msg;
 385
 386         memset(&msg, 0, sizeof(struct synthvid_msg));
 387         if (x2 == INT_MAX)
 388                 x2 = info->var.xres;
 389         if (y2 == INT_MAX)
 390                 y2 = info->var.yres;
 391
 392         msg.vid_hdr.type = SYNTHVID_DIRT;
 393         msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 394                 sizeof(struct synthvid_dirt);
 395         msg.dirt.video_output = 0;
 396         msg.dirt.dirt_count = 1;
 397         msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1;
 398         msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1;
 399         msg.dirt.rect[0].x2 =
 400                 (x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2;
 401         msg.dirt.rect[0].y2 =
 402                 (y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2;
 403
 404         synthvid_send(hdev, &msg);
 405
 406         return 0;
 407 }
 408
 409 static void hvfb_docopy(struct hvfb_par *par,
 410                         unsigned long offset,
 411                         unsigned long size)
 412 {
 413         if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready ||
 414             size == 0 || offset >= dio_fb_size)
 415                 return;
 416
 417         if (offset + size > dio_fb_size)
 418                 size = dio_fb_size - offset;
 419
 420         memcpy(par->mmio_vp + offset, par->dio_vp + offset, size);
 421 }
 422
 423 /* Deferred IO callback */
 424 static void synthvid_deferred_io(struct fb_info *p,
 425                                  struct list_head *pagelist)
 426 {
 427         struct hvfb_par *par = p->par;
 428         struct page *page;
 429         unsigned long start, end;
 430         int y1, y2, miny, maxy;
 431
 432         miny = INT_MAX;
 433         maxy = 0;
 434
 435         /*
 436          * Merge dirty pages. It is possible that last page cross
 437          * over the end of frame buffer row yres. This is taken care of
 438          * in synthvid_update function by clamping the y2
 439          * value to yres.
 440          */
 441         list_for_each_entry(page, pagelist, lru) {
 442                 start = page->index << PAGE_SHIFT;
 443                 end = start + PAGE_SIZE - 1;
 444                 y1 = start / p->fix.line_length;
 445                 y2 = end / p->fix.line_length;
 446                 miny = min_t(int, miny, y1);
 447                 maxy = max_t(int, maxy, y2);
 448
 449                 /* Copy from dio space to mmio address */
 450                 if (par->fb_ready && par->need_docopy)
 451                         hvfb_docopy(par, start, PAGE_SIZE);
 452         }
 453
 454         if (par->fb_ready && par->update)
 455                 synthvid_update(p, 0, miny, p->var.xres, maxy + 1);
 456 }
 457
 458 static struct fb_deferred_io synthvid_defio = {
 459         .delay          = HZ / 20,
 460         .deferred_io    = synthvid_deferred_io,
 461 };
 462
 463 /*
 464  * Actions on received messages from host:
 465  * Complete the wait event.
 466  * Or, reply with screen and cursor info.
 467  */
 468 static void synthvid_recv_sub(struct hv_device *hdev)
 469 {
 470         struct fb_info *info = hv_get_drvdata(hdev);
 471         struct hvfb_par *par;
 472         struct synthvid_msg *msg;
 473
 474         if (!info)
 475                 return;
 476
 477         par = info->par;
 478         msg = (struct synthvid_msg *)par->recv_buf;
 479
 480         /* Complete the wait event */
 481         if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
 482             msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE ||
 483             msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
 484                 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE);
 485                 complete(&par->wait);
 486                 return;
 487         }
 488
 489         /* Reply with screen and cursor info */
 490         if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) {
 491                 if (par->fb_ready) {
 492                         synthvid_send_ptr(hdev);
 493                         synthvid_send_situ(hdev);
 494                 }
 495
 496                 par->update = msg->feature_chg.is_dirt_needed;
 497                 if (par->update)
 498                         schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
 499         }
 500 }
 501
 502 /* Receive callback for messages from the host */
 503 static void synthvid_receive(void *ctx)
 504 {
 505         struct hv_device *hdev = ctx;
 506         struct fb_info *info = hv_get_drvdata(hdev);
 507         struct hvfb_par *par;
 508         struct synthvid_msg *recv_buf;
 509         u32 bytes_recvd;
 510         u64 req_id;
 511         int ret;
 512
 513         if (!info)
 514                 return;
 515
 516         par = info->par;
 517         recv_buf = (struct synthvid_msg *)par->recv_buf;
 518
 519         do {
 520                 ret = vmbus_recvpacket(hdev->channel, recv_buf,
 521                                        MAX_VMBUS_PKT_SIZE,
 522                                        &bytes_recvd, &req_id);
 523                 if (bytes_recvd > 0 &&
 524                     recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
 525                         synthvid_recv_sub(hdev);
 526         } while (bytes_recvd > 0 && ret == 0);
 527 }
 528
 529 /* Check if the ver1 version is equal or greater than ver2 */
 530 static inline bool synthvid_ver_ge(u32 ver1, u32 ver2)
 531 {
 532         if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) ||
 533             (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) &&
 534              SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2)))
 535                 return true;
 536
 537         return false;
 538 }
 539
 540 /* Check synthetic video protocol version with the host */
 541 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver)
 542 {
 543         struct fb_info *info = hv_get_drvdata(hdev);
 544         struct hvfb_par *par = info->par;
 545         struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
 546         int ret = 0;
 547         unsigned long t;
 548
 549         memset(msg, 0, sizeof(struct synthvid_msg));
 550         msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
 551         msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 552                 sizeof(struct synthvid_version_req);
 553         msg->ver_req.version = ver;
 554         synthvid_send(hdev, msg);
 555
 556         t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
 557         if (!t) {
 558                 pr_err("Time out on waiting version response\n");
 559                 ret = -ETIMEDOUT;
 560                 goto out;
 561         }
 562         if (!msg->ver_resp.is_accepted) {
 563                 ret = -ENODEV;
 564                 goto out;
 565         }
 566
 567         par->synthvid_version = ver;
 568         pr_info("Synthvid Version major %d, minor %d\n",
 569                 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver));
 570
 571 out:
 572         return ret;
 573 }
 574
 575 /* Get current resolution from the host */
 576 static int synthvid_get_supported_resolution(struct hv_device *hdev)
 577 {
 578         struct fb_info *info = hv_get_drvdata(hdev);
 579         struct hvfb_par *par = info->par;
 580         struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
 581         int ret = 0;
 582         unsigned long t;
 583         u8 index;
 584         int i;
 585
 586         memset(msg, 0, sizeof(struct synthvid_msg));
 587         msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST;
 588         msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 589                 sizeof(struct synthvid_supported_resolution_req);
 590
 591         msg->resolution_req.maximum_resolution_count =
 592                 SYNTHVID_MAX_RESOLUTION_COUNT;
 593         synthvid_send(hdev, msg);
 594
 595         t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
 596         if (!t) {
 597                 pr_err("Time out on waiting resolution response\n");
 598                 ret = -ETIMEDOUT;
 599                 goto out;
 600         }
 601
 602         if (msg->resolution_resp.resolution_count == 0) {
 603                 pr_err("No supported resolutions\n");
 604                 ret = -ENODEV;
 605                 goto out;
 606         }
 607
 608         index = msg->resolution_resp.default_resolution_index;
 609         if (index >= msg->resolution_resp.resolution_count) {
 610                 pr_err("Invalid resolution index: %d\n", index);
 611                 ret = -ENODEV;
 612                 goto out;
 613         }
 614
 615         for (i = 0; i < msg->resolution_resp.resolution_count; i++) {
 616                 screen_width_max = max_t(unsigned int, screen_width_max,
 617                     msg->resolution_resp.supported_resolution[i].width);
 618                 screen_height_max = max_t(unsigned int, screen_height_max,
 619                     msg->resolution_resp.supported_resolution[i].height);
 620         }
 621
 622         screen_width =
 623                 msg->resolution_resp.supported_resolution[index].width;
 624         screen_height =
 625                 msg->resolution_resp.supported_resolution[index].height;
 626
 627 out:
 628         return ret;
 629 }
 630
 631 /* Connect to VSP (Virtual Service Provider) on host */
 632 static int synthvid_connect_vsp(struct hv_device *hdev)
 633 {
 634         struct fb_info *info = hv_get_drvdata(hdev);
 635         struct hvfb_par *par = info->par;
 636         int ret;
 637
 638         ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE,
 639                          NULL, 0, synthvid_receive, hdev);
 640         if (ret) {
 641                 pr_err("Unable to open vmbus channel\n");
 642                 return ret;
 643         }
 644
 645         /* Negotiate the protocol version with host */
 646         switch (vmbus_proto_version) {
 647         case VERSION_WIN10:
 648         case VERSION_WIN10_V5:
 649                 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
 650                 if (!ret)
 651                         break;
 652                 fallthrough;
 653         case VERSION_WIN8:
 654         case VERSION_WIN8_1:
 655                 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8);
 656                 if (!ret)
 657                         break;
 658                 fallthrough;
 659         case VERSION_WS2008:
 660         case VERSION_WIN7:
 661                 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7);
 662                 break;
 663         default:
 664                 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
 665                 break;
 666         }
 667
 668         if (ret) {
 669                 pr_err("Synthetic video device version not accepted\n");
 670                 goto error;
 671         }
 672
 673         if (par->synthvid_version == SYNTHVID_VERSION_WIN7)
 674                 screen_depth = SYNTHVID_DEPTH_WIN7;
 675         else
 676                 screen_depth = SYNTHVID_DEPTH_WIN8;
 677
 678         if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) {
 679                 ret = synthvid_get_supported_resolution(hdev);
 680                 if (ret)
 681                         pr_info("Failed to get supported resolution from host, use default\n");
 682         }
 683
 684         screen_fb_size = hdev->channel->offermsg.offer.
 685                                 mmio_megabytes * 1024 * 1024;
 686
 687         return 0;
 688
 689 error:
 690         vmbus_close(hdev->channel);
 691         return ret;
 692 }
 693
 694 /* Send VRAM and Situation messages to the host */
 695 static int synthvid_send_config(struct hv_device *hdev)
 696 {
 697         struct fb_info *info = hv_get_drvdata(hdev);
 698         struct hvfb_par *par = info->par;
 699         struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
 700         int ret = 0;
 701         unsigned long t;
 702
 703         /* Send VRAM location */
 704         memset(msg, 0, sizeof(struct synthvid_msg));
 705         msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
 706         msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 707                 sizeof(struct synthvid_vram_location);
 708         msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp;
 709         msg->vram.is_vram_gpa_specified = 1;
 710         synthvid_send(hdev, msg);
 711
 712         t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
 713         if (!t) {
 714                 pr_err("Time out on waiting vram location ack\n");
 715                 ret = -ETIMEDOUT;
 716                 goto out;
 717         }
 718         if (msg->vram_ack.user_ctx != par->mmio_pp) {
 719                 pr_err("Unable to set VRAM location\n");
 720                 ret = -ENODEV;
 721                 goto out;
 722         }
 723
 724         /* Send pointer and situation update */
 725         synthvid_send_ptr(hdev);
 726         synthvid_send_situ(hdev);
 727
 728 out:
 729         return ret;
 730 }
 731
 732
 733 /*
 734  * Delayed work callback:
 735  * It is scheduled to call whenever update request is received and it has
 736  * not been called in last HVFB_ONDEMAND_THROTTLE time interval.
 737  */
 738 static void hvfb_update_work(struct work_struct *w)
 739 {
 740         struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work);
 741         struct fb_info *info = par->info;
 742         unsigned long flags;
 743         int x1, x2, y1, y2;
 744         int j;
 745
 746         spin_lock_irqsave(&par->delayed_refresh_lock, flags);
 747         /* Reset the request flag */
 748         par->delayed_refresh = false;
 749
 750         /* Store the dirty rectangle to local variables */
 751         x1 = par->x1;
 752         x2 = par->x2;
 753         y1 = par->y1;
 754         y2 = par->y2;
 755
 756         /* Clear dirty rectangle */
 757         par->x1 = par->y1 = INT_MAX;
 758         par->x2 = par->y2 = 0;
 759
 760         spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
 761
 762         if (x1 > info->var.xres || x2 > info->var.xres ||
 763             y1 > info->var.yres || y2 > info->var.yres || x2 <= x1)
 764                 return;
 765
 766         /* Copy the dirty rectangle to frame buffer memory */
 767         if (par->need_docopy)
 768                 for (j = y1; j < y2; j++)
 769                         hvfb_docopy(par,
 770                                     j * info->fix.line_length +
 771                                     (x1 * screen_depth / 8),
 772                                     (x2 - x1) * screen_depth / 8);
 773
 774         /* Refresh */
 775         if (par->fb_ready && par->update)
 776                 synthvid_update(info, x1, y1, x2, y2);
 777 }
 778
 779 /*
 780  * Control the on-demand refresh frequency. It schedules a delayed
 781  * screen update if it has not yet.
 782  */
 783 static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par,
 784                                            int x1, int y1, int w, int h)
 785 {
 786         unsigned long flags;
 787         int x2 = x1 + w;
 788         int y2 = y1 + h;
 789
 790         spin_lock_irqsave(&par->delayed_refresh_lock, flags);
 791
 792         /* Merge dirty rectangle */
 793         par->x1 = min_t(int, par->x1, x1);
 794         par->y1 = min_t(int, par->y1, y1);
 795         par->x2 = max_t(int, par->x2, x2);
 796         par->y2 = max_t(int, par->y2, y2);
 797
 798         /* Schedule a delayed screen update if not yet */
 799         if (par->delayed_refresh == false) {
 800                 schedule_delayed_work(&par->dwork,
 801                                       HVFB_ONDEMAND_THROTTLE);
 802                 par->delayed_refresh = true;
 803         }
 804
 805         spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
 806 }
 807
 808 static int hvfb_on_panic(struct notifier_block *nb,
 809                          unsigned long e, void *p)
 810 {
 811         struct hvfb_par *par;
 812         struct fb_info *info;
 813
 814         par = container_of(nb, struct hvfb_par, hvfb_panic_nb);
 815         par->synchronous_fb = true;
 816         info = par->info;
 817         if (par->need_docopy)
 818                 hvfb_docopy(par, 0, dio_fb_size);
 819         synthvid_update(info, 0, 0, INT_MAX, INT_MAX);
 820
 821         return NOTIFY_DONE;
 822 }
 823
 824 /* Framebuffer operation handlers */
 825
 826 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 827 {
 828         if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN ||
 829             var->xres > screen_width || var->yres >  screen_height ||
 830             var->bits_per_pixel != screen_depth)
 831                 return -EINVAL;
 832
 833         var->xres_virtual = var->xres;
 834         var->yres_virtual = var->yres;
 835
 836         return 0;
 837 }
 838
 839 static int hvfb_set_par(struct fb_info *info)
 840 {
 841         struct hv_device *hdev = device_to_hv_device(info->device);
 842
 843         return synthvid_send_situ(hdev);
 844 }
 845
 846
 847 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf)
 848 {
 849         return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
 850 }
 851
 852 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 853                           unsigned blue, unsigned transp, struct fb_info *info)
 854 {
 855         u32 *pal = info->pseudo_palette;
 856
 857         if (regno > 15)
 858                 return -EINVAL;
 859
 860         pal[regno] = chan_to_field(red, &info->var.red)
 861                 | chan_to_field(green, &info->var.green)
 862                 | chan_to_field(blue, &info->var.blue)
 863                 | chan_to_field(transp, &info->var.transp);
 864
 865         return 0;
 866 }
 867
 868 static int hvfb_blank(int blank, struct fb_info *info)
 869 {
 870         return 1;       /* get fb_blank to set the colormap to all black */
 871 }
 872
 873 static void hvfb_cfb_fillrect(struct fb_info *p,
 874                               const struct fb_fillrect *rect)
 875 {
 876         struct hvfb_par *par = p->par;
 877
 878         cfb_fillrect(p, rect);
 879         if (par->synchronous_fb)
 880                 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
 881         else
 882                 hvfb_ondemand_refresh_throttle(par, rect->dx, rect->dy,
 883                                                rect->width, rect->height);
 884 }
 885
 886 static void hvfb_cfb_copyarea(struct fb_info *p,
 887                               const struct fb_copyarea *area)
 888 {
 889         struct hvfb_par *par = p->par;
 890
 891         cfb_copyarea(p, area);
 892         if (par->synchronous_fb)
 893                 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
 894         else
 895                 hvfb_ondemand_refresh_throttle(par, area->dx, area->dy,
 896                                                area->width, area->height);
 897 }
 898
 899 static void hvfb_cfb_imageblit(struct fb_info *p,
 900                                const struct fb_image *image)
 901 {
 902         struct hvfb_par *par = p->par;
 903
 904         cfb_imageblit(p, image);
 905         if (par->synchronous_fb)
 906                 synthvid_update(p, 0, 0, INT_MAX, INT_MAX);
 907         else
 908                 hvfb_ondemand_refresh_throttle(par, image->dx, image->dy,
 909                                                image->width, image->height);
 910 }
 911
 912 static const struct fb_ops hvfb_ops = {
 913         .owner = THIS_MODULE,
 914         .fb_check_var = hvfb_check_var,
 915         .fb_set_par = hvfb_set_par,
 916         .fb_setcolreg = hvfb_setcolreg,
 917         .fb_fillrect = hvfb_cfb_fillrect,
 918         .fb_copyarea = hvfb_cfb_copyarea,
 919         .fb_imageblit = hvfb_cfb_imageblit,
 920         .fb_blank = hvfb_blank,
 921 };
 922
 923
 924 /* Get options from kernel paramenter "video=" */
 925 static void hvfb_get_option(struct fb_info *info)
 926 {
 927         struct hvfb_par *par = info->par;
 928         char *opt = NULL, *p;
 929         uint x = 0, y = 0;
 930
 931         if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt)
 932                 return;
 933
 934         p = strsep(&opt, "x");
 935         if (!*p || kstrtouint(p, 0, &x) ||
 936             !opt || !*opt || kstrtouint(opt, 0, &y)) {
 937                 pr_err("Screen option is invalid: skipped\n");
 938                 return;
 939         }
 940
 941         if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN ||
 942             (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) &&
 943             (x > screen_width_max || y > screen_height_max)) ||
 944             (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
 945              x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) ||
 946             (par->synthvid_version == SYNTHVID_VERSION_WIN7 &&
 947              (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) {
 948                 pr_err("Screen resolution option is out of range: skipped\n");
 949                 return;
 950         }
 951
 952         screen_width = x;
 953         screen_height = y;
 954         return;
 955 }
 956
 957 /*
 958  * Allocate enough contiguous physical memory.
 959  * Return physical address if succeeded or -1 if failed.
 960  */
 961 static phys_addr_t hvfb_get_phymem(struct hv_device *hdev,
 962                                    unsigned int request_size)
 963 {
 964         struct page *page = NULL;
 965         dma_addr_t dma_handle;
 966         void *vmem;
 967         phys_addr_t paddr = 0;
 968         unsigned int order = get_order(request_size);
 969
 970         if (request_size == 0)
 971                 return -1;
 972
 973         if (order < MAX_ORDER) {
 974                 /* Call alloc_pages if the size is less than 2^MAX_ORDER */
 975                 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
 976                 if (!page)
 977                         return -1;
 978
 979                 paddr = (page_to_pfn(page) << PAGE_SHIFT);
 980         } else {
 981                 /* Allocate from CMA */
 982                 hdev->device.coherent_dma_mask = DMA_BIT_MASK(64);
 983
 984                 vmem = dma_alloc_coherent(&hdev->device,
 985                                           round_up(request_size, PAGE_SIZE),
 986                                           &dma_handle,
 987                                           GFP_KERNEL | __GFP_NOWARN);
 988
 989                 if (!vmem)
 990                         return -1;
 991
 992                 paddr = virt_to_phys(vmem);
 993         }
 994
 995         return paddr;
 996 }
 997
 998 /* Release contiguous physical memory */
 999 static void hvfb_release_phymem(struct hv_device *hdev,
1000                                 phys_addr_t paddr, unsigned int size)
1001 {
1002         unsigned int order = get_order(size);
1003
1004         if (order < MAX_ORDER)
1005                 __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order);
1006         else
1007                 dma_free_coherent(&hdev->device,
1008                                   round_up(size, PAGE_SIZE),
1009                                   phys_to_virt(paddr),
1010                                   paddr);
1011 }
1012
1013
1014 /* Get framebuffer memory from Hyper-V video pci space */
1015 static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
1016 {
1017         struct hvfb_par *par = info->par;
1018         struct pci_dev *pdev  = NULL;
1019         void __iomem *fb_virt;
1020         int gen2vm = efi_enabled(EFI_BOOT);
1021         resource_size_t pot_start, pot_end;
1022         phys_addr_t paddr;
1023         int ret;
1024
1025         info->apertures = alloc_apertures(1);
1026         if (!info->apertures)
1027                 return -ENOMEM;
1028
1029         if (!gen2vm) {
1030                 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
1031                         PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
1032                 if (!pdev) {
1033                         pr_err("Unable to find PCI Hyper-V video\n");
1034                         return -ENODEV;
1035                 }
1036
1037                 info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
1038                 info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
1039
1040                 /*
1041                  * For Gen 1 VM, we can directly use the contiguous memory
1042                  * from VM. If we succeed, deferred IO happens directly
1043                  * on this allocated framebuffer memory, avoiding extra
1044                  * memory copy.
1045                  */
1046                 paddr = hvfb_get_phymem(hdev, screen_fb_size);
1047                 if (paddr != (phys_addr_t) -1) {
1048                         par->mmio_pp = paddr;
1049                         par->mmio_vp = par->dio_vp = __va(paddr);
1050
1051                         info->fix.smem_start = paddr;
1052                         info->fix.smem_len = screen_fb_size;
1053                         info->screen_base = par->mmio_vp;
1054                         info->screen_size = screen_fb_size;
1055
1056                         par->need_docopy = false;
1057                         goto getmem_done;
1058                 }
1059                 pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n");
1060         } else {
1061                 info->apertures->ranges[0].base = screen_info.lfb_base;
1062                 info->apertures->ranges[0].size = screen_info.lfb_size;
1063         }
1064
1065         /*
1066          * Cannot use the contiguous physical memory.
1067          * Allocate mmio space for framebuffer.
1068          */
1069         dio_fb_size =
1070                 screen_width * screen_height * screen_depth / 8;
1071
1072         if (gen2vm) {
1073                 pot_start = 0;
1074                 pot_end = -1;
1075         } else {
1076                 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) ||
1077                     pci_resource_len(pdev, 0) < screen_fb_size) {
1078                         pr_err("Resource not available or (0x%lx < 0x%lx)\n",
1079                                (unsigned long) pci_resource_len(pdev, 0),
1080                                (unsigned long) screen_fb_size);
1081                         goto err1;
1082                 }
1083
1084                 pot_end = pci_resource_end(pdev, 0);
1085                 pot_start = pot_end - screen_fb_size + 1;
1086         }
1087
1088         ret = vmbus_allocate_mmio(&par->mem, hdev, pot_start, pot_end,
1089                                   screen_fb_size, 0x100000, true);
1090         if (ret != 0) {
1091                 pr_err("Unable to allocate framebuffer memory\n");
1092                 goto err1;
1093         }
1094
1095         /*
1096          * Map the VRAM cacheable for performance. This is also required for
1097          * VM Connect to display properly for ARM64 Linux VM, as the host also
1098          * maps the VRAM cacheable.
1099          */
1100         fb_virt = ioremap_cache(par->mem->start, screen_fb_size);
1101         if (!fb_virt)
1102                 goto err2;
1103
1104         /* Allocate memory for deferred IO */
1105         par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE));
1106         if (par->dio_vp == NULL)
1107                 goto err3;
1108
1109         /* Physical address of FB device */
1110         par->mmio_pp = par->mem->start;
1111         /* Virtual address of FB device */
1112         par->mmio_vp = (unsigned char *) fb_virt;
1113
1114         info->fix.smem_start = par->mem->start;
1115         info->fix.smem_len = dio_fb_size;
1116         info->screen_base = par->dio_vp;
1117         info->screen_size = dio_fb_size;
1118
1119 getmem_done:
1120         remove_conflicting_framebuffers(info->apertures,
1121                                         KBUILD_MODNAME, false);
1122
1123         if (gen2vm) {
1124                 /* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */
1125                 screen_info.lfb_size = 0;
1126                 screen_info.lfb_base = 0;
1127                 screen_info.orig_video_isVGA = 0;
1128         } else {
1129                 pci_dev_put(pdev);
1130         }
1131
1132         return 0;
1133
1134 err3:
1135         iounmap(fb_virt);
1136 err2:
1137         vmbus_free_mmio(par->mem->start, screen_fb_size);
1138         par->mem = NULL;
1139 err1:
1140         if (!gen2vm)
1141                 pci_dev_put(pdev);
1142
1143         return -ENOMEM;
1144 }
1145
1146 /* Release the framebuffer */
1147 static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info)
1148 {
1149         struct hvfb_par *par = info->par;
1150
1151         if (par->need_docopy) {
1152                 vfree(par->dio_vp);
1153                 iounmap(info->screen_base);
1154                 vmbus_free_mmio(par->mem->start, screen_fb_size);
1155         } else {
1156                 hvfb_release_phymem(hdev, info->fix.smem_start,
1157                                     screen_fb_size);
1158         }
1159
1160         par->mem = NULL;
1161 }
1162
1163
1164 static int hvfb_probe(struct hv_device *hdev,
1165                       const struct hv_vmbus_device_id *dev_id)
1166 {
1167         struct fb_info *info;
1168         struct hvfb_par *par;
1169         int ret;
1170
1171         info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device);
1172         if (!info)
1173                 return -ENOMEM;
1174
1175         par = info->par;
1176         par->info = info;
1177         par->fb_ready = false;
1178         par->need_docopy = true;
1179         init_completion(&par->wait);
1180         INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
1181
1182         par->delayed_refresh = false;
1183         spin_lock_init(&par->delayed_refresh_lock);
1184         par->x1 = par->y1 = INT_MAX;
1185         par->x2 = par->y2 = 0;
1186
1187         /* Connect to VSP */
1188         hv_set_drvdata(hdev, info);
1189         ret = synthvid_connect_vsp(hdev);
1190         if (ret) {
1191                 pr_err("Unable to connect to VSP\n");
1192                 goto error1;
1193         }
1194
1195         hvfb_get_option(info);
1196         pr_info("Screen resolution: %dx%d, Color depth: %d\n",
1197                 screen_width, screen_height, screen_depth);
1198
1199         ret = hvfb_getmem(hdev, info);
1200         if (ret) {
1201                 pr_err("No memory for framebuffer\n");
1202                 goto error2;
1203         }
1204
1205         /* Set up fb_info */
1206         info->flags = FBINFO_DEFAULT;
1207
1208         info->var.xres_virtual = info->var.xres = screen_width;
1209         info->var.yres_virtual = info->var.yres = screen_height;
1210         info->var.bits_per_pixel = screen_depth;
1211
1212         if (info->var.bits_per_pixel == 16) {
1213                 info->var.red = (struct fb_bitfield){11, 5, 0};
1214                 info->var.green = (struct fb_bitfield){5, 6, 0};
1215                 info->var.blue = (struct fb_bitfield){0, 5, 0};
1216                 info->var.transp = (struct fb_bitfield){0, 0, 0};
1217         } else {
1218                 info->var.red = (struct fb_bitfield){16, 8, 0};
1219                 info->var.green = (struct fb_bitfield){8, 8, 0};
1220                 info->var.blue = (struct fb_bitfield){0, 8, 0};
1221                 info->var.transp = (struct fb_bitfield){24, 8, 0};
1222         }
1223
1224         info->var.activate = FB_ACTIVATE_NOW;
1225         info->var.height = -1;
1226         info->var.width = -1;
1227         info->var.vmode = FB_VMODE_NONINTERLACED;
1228
1229         strcpy(info->fix.id, KBUILD_MODNAME);
1230         info->fix.type = FB_TYPE_PACKED_PIXELS;
1231         info->fix.visual = FB_VISUAL_TRUECOLOR;
1232         info->fix.line_length = screen_width * screen_depth / 8;
1233         info->fix.accel = FB_ACCEL_NONE;
1234
1235         info->fbops = &hvfb_ops;
1236         info->pseudo_palette = par->pseudo_palette;
1237
1238         /* Initialize deferred IO */
1239         info->fbdefio = &synthvid_defio;
1240         fb_deferred_io_init(info);
1241
1242         /* Send config to host */
1243         ret = synthvid_send_config(hdev);
1244         if (ret)
1245                 goto error;
1246
1247         ret = register_framebuffer(info);
1248         if (ret) {
1249                 pr_err("Unable to register framebuffer\n");
1250                 goto error;
1251         }
1252
1253         par->fb_ready = true;
1254
1255         par->synchronous_fb = false;
1256         par->hvfb_panic_nb.notifier_call = hvfb_on_panic;
1257         atomic_notifier_chain_register(&panic_notifier_list,
1258                                        &par->hvfb_panic_nb);
1259
1260         return 0;
1261
1262 error:
1263         fb_deferred_io_cleanup(info);
1264         hvfb_putmem(hdev, info);
1265 error2:
1266         vmbus_close(hdev->channel);
1267 error1:
1268         cancel_delayed_work_sync(&par->dwork);
1269         hv_set_drvdata(hdev, NULL);
1270         framebuffer_release(info);
1271         return ret;
1272 }
1273
1274
1275 static int hvfb_remove(struct hv_device *hdev)
1276 {
1277         struct fb_info *info = hv_get_drvdata(hdev);
1278         struct hvfb_par *par = info->par;
1279
1280         atomic_notifier_chain_unregister(&panic_notifier_list,
1281                                          &par->hvfb_panic_nb);
1282
1283         par->update = false;
1284         par->fb_ready = false;
1285
1286         fb_deferred_io_cleanup(info);
1287
1288         unregister_framebuffer(info);
1289         cancel_delayed_work_sync(&par->dwork);
1290
1291         vmbus_close(hdev->channel);
1292         hv_set_drvdata(hdev, NULL);
1293
1294         hvfb_putmem(hdev, info);
1295         framebuffer_release(info);
1296
1297         return 0;
1298 }
1299
1300 static int hvfb_suspend(struct hv_device *hdev)
1301 {
1302         struct fb_info *info = hv_get_drvdata(hdev);
1303         struct hvfb_par *par = info->par;
1304
1305         console_lock();
1306
1307         /* 1 means do suspend */
1308         fb_set_suspend(info, 1);
1309
1310         cancel_delayed_work_sync(&par->dwork);
1311         cancel_delayed_work_sync(&info->deferred_work);
1312
1313         par->update_saved = par->update;
1314         par->update = false;
1315         par->fb_ready = false;
1316
1317         vmbus_close(hdev->channel);
1318
1319         console_unlock();
1320
1321         return 0;
1322 }
1323
1324 static int hvfb_resume(struct hv_device *hdev)
1325 {
1326         struct fb_info *info = hv_get_drvdata(hdev);
1327         struct hvfb_par *par = info->par;
1328         int ret;
1329
1330         console_lock();
1331
1332         ret = synthvid_connect_vsp(hdev);
1333         if (ret != 0)
1334                 goto out;
1335
1336         ret = synthvid_send_config(hdev);
1337         if (ret != 0) {
1338                 vmbus_close(hdev->channel);
1339                 goto out;
1340         }
1341
1342         par->fb_ready = true;
1343         par->update = par->update_saved;
1344
1345         schedule_delayed_work(&info->deferred_work, info->fbdefio->delay);
1346         schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
1347
1348         /* 0 means do resume */
1349         fb_set_suspend(info, 0);
1350
1351 out:
1352         console_unlock();
1353
1354         return ret;
1355 }
1356
1357
1358 static const struct pci_device_id pci_stub_id_table[] = {
1359         {
1360                 .vendor      = PCI_VENDOR_ID_MICROSOFT,
1361                 .device      = PCI_DEVICE_ID_HYPERV_VIDEO,
1362         },
1363         { /* end of list */ }
1364 };
1365
1366 static const struct hv_vmbus_device_id id_table[] = {
1367         /* Synthetic Video Device GUID */
1368         {HV_SYNTHVID_GUID},
1369         {}
1370 };
1371
1372 MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
1373 MODULE_DEVICE_TABLE(vmbus, id_table);
1374
1375 static struct hv_driver hvfb_drv = {
1376         .name = KBUILD_MODNAME,
1377         .id_table = id_table,
1378         .probe = hvfb_probe,
1379         .remove = hvfb_remove,
1380         .suspend = hvfb_suspend,
1381         .resume = hvfb_resume,
1382         .driver = {
1383                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1384         },
1385 };
1386
1387 static int hvfb_pci_stub_probe(struct pci_dev *pdev,
1388                                const struct pci_device_id *ent)
1389 {
1390         return 0;
1391 }
1392
1393 static void hvfb_pci_stub_remove(struct pci_dev *pdev)
1394 {
1395 }
1396
1397 static struct pci_driver hvfb_pci_stub_driver = {
1398         .name =         KBUILD_MODNAME,
1399         .id_table =     pci_stub_id_table,
1400         .probe =        hvfb_pci_stub_probe,
1401         .remove =       hvfb_pci_stub_remove,
1402         .driver = {
1403                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1404         }
1405 };
1406
1407 static int __init hvfb_drv_init(void)
1408 {
1409         int ret;
1410
1411         ret = vmbus_driver_register(&hvfb_drv);
1412         if (ret != 0)
1413                 return ret;
1414
1415         ret = pci_register_driver(&hvfb_pci_stub_driver);
1416         if (ret != 0) {
1417                 vmbus_driver_unregister(&hvfb_drv);
1418                 return ret;
1419         }
1420
1421         return 0;
1422 }
1423
1424 static void __exit hvfb_drv_exit(void)
1425 {
1426         pci_unregister_driver(&hvfb_pci_stub_driver);
1427         vmbus_driver_unregister(&hvfb_drv);
1428 }
1429
1430 module_init(hvfb_drv_init);
1431 module_exit(hvfb_drv_exit);
1432
1433 MODULE_LICENSE("GPL");
1434 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver");