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