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