drivers/video/hyperv_fb.c

   1 /*
   2  * Copyright (c) 2012, Microsoft Corporation.
   3  *
   4  * Author:
   5  *   Haiyang Zhang <haiyangz@microsoft.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published
   9  * by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  14  * NON INFRINGEMENT.  See the GNU General Public License for more
  15  * details.
  16  */
  17
  18 /*
  19  * Hyper-V Synthetic Video Frame Buffer Driver
  20  *
  21  * This is the driver for the Hyper-V Synthetic Video, which supports
  22  * screen resolution up to Full HD 1920x1080 with 32 bit color on Windows
  23  * Server 2012, and 1600x1200 with 16 bit color on Windows Server 2008 R2
  24  * or earlier.
  25  *
  26  * It also solves the double mouse cursor issue of the emulated video mode.
  27  *
  28  * The default screen resolution is 1152x864, which may be changed by a
  29  * kernel parameter:
  30  *     video=hyperv_fb:<width>x<height>
  31  *     For example: video=hyperv_fb:1280x1024
  32  *
  33  * Portrait orientation is also supported:
  34  *     For example: video=hyperv_fb:864x1152
  35  */
  36
  37 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  38
  39 #include <linux/module.h>
  40 #include <linux/kernel.h>
  41 #include <linux/init.h>
  42 #include <linux/completion.h>
  43 #include <linux/fb.h>
  44 #include <linux/pci.h>
  45
  46 #include <linux/hyperv.h>
  47
  48
  49 /* Hyper-V Synthetic Video Protocol definitions and structures */
  50 #define MAX_VMBUS_PKT_SIZE 0x4000
  51
  52 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
  53 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
  54 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
  55
  56 #define SYNTHVID_DEPTH_WIN7 16
  57 #define SYNTHVID_DEPTH_WIN8 32
  58
  59 #define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024)
  60 #define SYNTHVID_WIDTH_MAX_WIN7 1600
  61 #define SYNTHVID_HEIGHT_MAX_WIN7 1200
  62
  63 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
  64
  65 #define PCI_VENDOR_ID_MICROSOFT 0x1414
  66 #define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353
  67
  68
  69 enum pipe_msg_type {
  70         PIPE_MSG_INVALID,
  71         PIPE_MSG_DATA,
  72         PIPE_MSG_MAX
  73 };
  74
  75 struct pipe_msg_hdr {
  76         u32 type;
  77         u32 size; /* size of message after this field */
  78 } __packed;
  79
  80
  81 enum synthvid_msg_type {
  82         SYNTHVID_ERROR                  = 0,
  83         SYNTHVID_VERSION_REQUEST        = 1,
  84         SYNTHVID_VERSION_RESPONSE       = 2,
  85         SYNTHVID_VRAM_LOCATION          = 3,
  86         SYNTHVID_VRAM_LOCATION_ACK      = 4,
  87         SYNTHVID_SITUATION_UPDATE       = 5,
  88         SYNTHVID_SITUATION_UPDATE_ACK   = 6,
  89         SYNTHVID_POINTER_POSITION       = 7,
  90         SYNTHVID_POINTER_SHAPE          = 8,
  91         SYNTHVID_FEATURE_CHANGE         = 9,
  92         SYNTHVID_DIRT                   = 10,
  93
  94         SYNTHVID_MAX                    = 11
  95 };
  96
  97 struct synthvid_msg_hdr {
  98         u32 type;
  99         u32 size;  /* size of this header + payload after this field*/
 100 } __packed;
 101
 102
 103 struct synthvid_version_req {
 104         u32 version;
 105 } __packed;
 106
 107 struct synthvid_version_resp {
 108         u32 version;
 109         u8 is_accepted;
 110         u8 max_video_outputs;
 111 } __packed;
 112
 113 struct synthvid_vram_location {
 114         u64 user_ctx;
 115         u8 is_vram_gpa_specified;
 116         u64 vram_gpa;
 117 } __packed;
 118
 119 struct synthvid_vram_location_ack {
 120         u64 user_ctx;
 121 } __packed;
 122
 123 struct video_output_situation {
 124         u8 active;
 125         u32 vram_offset;
 126         u8 depth_bits;
 127         u32 width_pixels;
 128         u32 height_pixels;
 129         u32 pitch_bytes;
 130 } __packed;
 131
 132 struct synthvid_situation_update {
 133         u64 user_ctx;
 134         u8 video_output_count;
 135         struct video_output_situation video_output[1];
 136 } __packed;
 137
 138 struct synthvid_situation_update_ack {
 139         u64 user_ctx;
 140 } __packed;
 141
 142 struct synthvid_pointer_position {
 143         u8 is_visible;
 144         u8 video_output;
 145         s32 image_x;
 146         s32 image_y;
 147 } __packed;
 148
 149
 150 #define CURSOR_MAX_X 96
 151 #define CURSOR_MAX_Y 96
 152 #define CURSOR_ARGB_PIXEL_SIZE 4
 153 #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE)
 154 #define CURSOR_COMPLETE (-1)
 155
 156 struct synthvid_pointer_shape {
 157         u8 part_idx;
 158         u8 is_argb;
 159         u32 width; /* CURSOR_MAX_X at most */
 160         u32 height; /* CURSOR_MAX_Y at most */
 161         u32 hot_x; /* hotspot relative to upper-left of pointer image */
 162         u32 hot_y;
 163         u8 data[4];
 164 } __packed;
 165
 166 struct synthvid_feature_change {
 167         u8 is_dirt_needed;
 168         u8 is_ptr_pos_needed;
 169         u8 is_ptr_shape_needed;
 170         u8 is_situ_needed;
 171 } __packed;
 172
 173 struct rect {
 174         s32 x1, y1; /* top left corner */
 175         s32 x2, y2; /* bottom right corner, exclusive */
 176 } __packed;
 177
 178 struct synthvid_dirt {
 179         u8 video_output;
 180         u8 dirt_count;
 181         struct rect rect[1];
 182 } __packed;
 183
 184 struct synthvid_msg {
 185         struct pipe_msg_hdr pipe_hdr;
 186         struct synthvid_msg_hdr vid_hdr;
 187         union {
 188                 struct synthvid_version_req ver_req;
 189                 struct synthvid_version_resp ver_resp;
 190                 struct synthvid_vram_location vram;
 191                 struct synthvid_vram_location_ack vram_ack;
 192                 struct synthvid_situation_update situ;
 193                 struct synthvid_situation_update_ack situ_ack;
 194                 struct synthvid_pointer_position ptr_pos;
 195                 struct synthvid_pointer_shape ptr_shape;
 196                 struct synthvid_feature_change feature_chg;
 197                 struct synthvid_dirt dirt;
 198         };
 199 } __packed;
 200
 201
 202
 203 /* FB driver definitions and structures */
 204 #define HVFB_WIDTH 1152 /* default screen width */
 205 #define HVFB_HEIGHT 864 /* default screen height */
 206 #define HVFB_WIDTH_MIN 640
 207 #define HVFB_HEIGHT_MIN 480
 208
 209 #define RING_BUFSIZE (256 * 1024)
 210 #define VSP_TIMEOUT (10 * HZ)
 211 #define HVFB_UPDATE_DELAY (HZ / 20)
 212
 213 struct hvfb_par {
 214         struct fb_info *info;
 215         bool fb_ready; /* fb device is ready */
 216         struct completion wait;
 217         u32 synthvid_version;
 218
 219         struct delayed_work dwork;
 220         bool update;
 221
 222         u32 pseudo_palette[16];
 223         u8 init_buf[MAX_VMBUS_PKT_SIZE];
 224         u8 recv_buf[MAX_VMBUS_PKT_SIZE];
 225 };
 226
 227 static uint screen_width = HVFB_WIDTH;
 228 static uint screen_height = HVFB_HEIGHT;
 229 static uint screen_depth;
 230 static uint screen_fb_size;
 231
 232 /* Send message to Hyper-V host */
 233 static inline int synthvid_send(struct hv_device *hdev,
 234                                 struct synthvid_msg *msg)
 235 {
 236         static atomic64_t request_id = ATOMIC64_INIT(0);
 237         int ret;
 238
 239         msg->pipe_hdr.type = PIPE_MSG_DATA;
 240         msg->pipe_hdr.size = msg->vid_hdr.size;
 241
 242         ret = vmbus_sendpacket(hdev->channel, msg,
 243                                msg->vid_hdr.size + sizeof(struct pipe_msg_hdr),
 244                                atomic64_inc_return(&request_id),
 245                                VM_PKT_DATA_INBAND, 0);
 246
 247         if (ret)
 248                 pr_err("Unable to send packet via vmbus\n");
 249
 250         return ret;
 251 }
 252
 253
 254 /* Send screen resolution info to host */
 255 static int synthvid_send_situ(struct hv_device *hdev)
 256 {
 257         struct fb_info *info = hv_get_drvdata(hdev);
 258         struct synthvid_msg msg;
 259
 260         if (!info)
 261                 return -ENODEV;
 262
 263         memset(&msg, 0, sizeof(struct synthvid_msg));
 264
 265         msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
 266         msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 267                 sizeof(struct synthvid_situation_update);
 268         msg.situ.user_ctx = 0;
 269         msg.situ.video_output_count = 1;
 270         msg.situ.video_output[0].active = 1;
 271         msg.situ.video_output[0].vram_offset = 0;
 272         msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel;
 273         msg.situ.video_output[0].width_pixels = info->var.xres;
 274         msg.situ.video_output[0].height_pixels = info->var.yres;
 275         msg.situ.video_output[0].pitch_bytes = info->fix.line_length;
 276
 277         synthvid_send(hdev, &msg);
 278
 279         return 0;
 280 }
 281
 282 /* Send mouse pointer info to host */
 283 static int synthvid_send_ptr(struct hv_device *hdev)
 284 {
 285         struct synthvid_msg msg;
 286
 287         memset(&msg, 0, sizeof(struct synthvid_msg));
 288         msg.vid_hdr.type = SYNTHVID_POINTER_POSITION;
 289         msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 290                 sizeof(struct synthvid_pointer_position);
 291         msg.ptr_pos.is_visible = 1;
 292         msg.ptr_pos.video_output = 0;
 293         msg.ptr_pos.image_x = 0;
 294         msg.ptr_pos.image_y = 0;
 295         synthvid_send(hdev, &msg);
 296
 297         memset(&msg, 0, sizeof(struct synthvid_msg));
 298         msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE;
 299         msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 300                 sizeof(struct synthvid_pointer_shape);
 301         msg.ptr_shape.part_idx = CURSOR_COMPLETE;
 302         msg.ptr_shape.is_argb = 1;
 303         msg.ptr_shape.width = 1;
 304         msg.ptr_shape.height = 1;
 305         msg.ptr_shape.hot_x = 0;
 306         msg.ptr_shape.hot_y = 0;
 307         msg.ptr_shape.data[0] = 0;
 308         msg.ptr_shape.data[1] = 1;
 309         msg.ptr_shape.data[2] = 1;
 310         msg.ptr_shape.data[3] = 1;
 311         synthvid_send(hdev, &msg);
 312
 313         return 0;
 314 }
 315
 316 /* Send updated screen area (dirty rectangle) location to host */
 317 static int synthvid_update(struct fb_info *info)
 318 {
 319         struct hv_device *hdev = device_to_hv_device(info->device);
 320         struct synthvid_msg msg;
 321
 322         memset(&msg, 0, sizeof(struct synthvid_msg));
 323
 324         msg.vid_hdr.type = SYNTHVID_DIRT;
 325         msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 326                 sizeof(struct synthvid_dirt);
 327         msg.dirt.video_output = 0;
 328         msg.dirt.dirt_count = 1;
 329         msg.dirt.rect[0].x1 = 0;
 330         msg.dirt.rect[0].y1 = 0;
 331         msg.dirt.rect[0].x2 = info->var.xres;
 332         msg.dirt.rect[0].y2 = info->var.yres;
 333
 334         synthvid_send(hdev, &msg);
 335
 336         return 0;
 337 }
 338
 339
 340 /*
 341  * Actions on received messages from host:
 342  * Complete the wait event.
 343  * Or, reply with screen and cursor info.
 344  */
 345 static void synthvid_recv_sub(struct hv_device *hdev)
 346 {
 347         struct fb_info *info = hv_get_drvdata(hdev);
 348         struct hvfb_par *par;
 349         struct synthvid_msg *msg;
 350
 351         if (!info)
 352                 return;
 353
 354         par = info->par;
 355         msg = (struct synthvid_msg *)par->recv_buf;
 356
 357         /* Complete the wait event */
 358         if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
 359             msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
 360                 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE);
 361                 complete(&par->wait);
 362                 return;
 363         }
 364
 365         /* Reply with screen and cursor info */
 366         if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) {
 367                 if (par->fb_ready) {
 368                         synthvid_send_ptr(hdev);
 369                         synthvid_send_situ(hdev);
 370                 }
 371
 372                 par->update = msg->feature_chg.is_dirt_needed;
 373                 if (par->update)
 374                         schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
 375         }
 376 }
 377
 378 /* Receive callback for messages from the host */
 379 static void synthvid_receive(void *ctx)
 380 {
 381         struct hv_device *hdev = ctx;
 382         struct fb_info *info = hv_get_drvdata(hdev);
 383         struct hvfb_par *par;
 384         struct synthvid_msg *recv_buf;
 385         u32 bytes_recvd;
 386         u64 req_id;
 387         int ret;
 388
 389         if (!info)
 390                 return;
 391
 392         par = info->par;
 393         recv_buf = (struct synthvid_msg *)par->recv_buf;
 394
 395         do {
 396                 ret = vmbus_recvpacket(hdev->channel, recv_buf,
 397                                        MAX_VMBUS_PKT_SIZE,
 398                                        &bytes_recvd, &req_id);
 399                 if (bytes_recvd > 0 &&
 400                     recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
 401                         synthvid_recv_sub(hdev);
 402         } while (bytes_recvd > 0 && ret == 0);
 403 }
 404
 405 /* Check synthetic video protocol version with the host */
 406 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver)
 407 {
 408         struct fb_info *info = hv_get_drvdata(hdev);
 409         struct hvfb_par *par = info->par;
 410         struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
 411         int t, ret = 0;
 412
 413         memset(msg, 0, sizeof(struct synthvid_msg));
 414         msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
 415         msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 416                 sizeof(struct synthvid_version_req);
 417         msg->ver_req.version = ver;
 418         synthvid_send(hdev, msg);
 419
 420         t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
 421         if (!t) {
 422                 pr_err("Time out on waiting version response\n");
 423                 ret = -ETIMEDOUT;
 424                 goto out;
 425         }
 426         if (!msg->ver_resp.is_accepted) {
 427                 ret = -ENODEV;
 428                 goto out;
 429         }
 430
 431         par->synthvid_version = ver;
 432
 433 out:
 434         return ret;
 435 }
 436
 437 /* Connect to VSP (Virtual Service Provider) on host */
 438 static int synthvid_connect_vsp(struct hv_device *hdev)
 439 {
 440         struct fb_info *info = hv_get_drvdata(hdev);
 441         struct hvfb_par *par = info->par;
 442         int ret;
 443
 444         ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE,
 445                          NULL, 0, synthvid_receive, hdev);
 446         if (ret) {
 447                 pr_err("Unable to open vmbus channel\n");
 448                 return ret;
 449         }
 450
 451         /* Negotiate the protocol version with host */
 452         if (vmbus_proto_version == VERSION_WS2008 ||
 453             vmbus_proto_version == VERSION_WIN7)
 454                 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7);
 455         else
 456                 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8);
 457
 458         if (ret) {
 459                 pr_err("Synthetic video device version not accepted\n");
 460                 goto error;
 461         }
 462
 463         if (par->synthvid_version == SYNTHVID_VERSION_WIN7) {
 464                 screen_depth = SYNTHVID_DEPTH_WIN7;
 465                 screen_fb_size = SYNTHVID_FB_SIZE_WIN7;
 466         } else {
 467                 screen_depth = SYNTHVID_DEPTH_WIN8;
 468                 screen_fb_size = SYNTHVID_FB_SIZE_WIN8;
 469         }
 470
 471         return 0;
 472
 473 error:
 474         vmbus_close(hdev->channel);
 475         return ret;
 476 }
 477
 478 /* Send VRAM and Situation messages to the host */
 479 static int synthvid_send_config(struct hv_device *hdev)
 480 {
 481         struct fb_info *info = hv_get_drvdata(hdev);
 482         struct hvfb_par *par = info->par;
 483         struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
 484         int t, ret = 0;
 485
 486         /* Send VRAM location */
 487         memset(msg, 0, sizeof(struct synthvid_msg));
 488         msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
 489         msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 490                 sizeof(struct synthvid_vram_location);
 491         msg->vram.user_ctx = msg->vram.vram_gpa = info->fix.smem_start;
 492         msg->vram.is_vram_gpa_specified = 1;
 493         synthvid_send(hdev, msg);
 494
 495         t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
 496         if (!t) {
 497                 pr_err("Time out on waiting vram location ack\n");
 498                 ret = -ETIMEDOUT;
 499                 goto out;
 500         }
 501         if (msg->vram_ack.user_ctx != info->fix.smem_start) {
 502                 pr_err("Unable to set VRAM location\n");
 503                 ret = -ENODEV;
 504                 goto out;
 505         }
 506
 507         /* Send pointer and situation update */
 508         synthvid_send_ptr(hdev);
 509         synthvid_send_situ(hdev);
 510
 511 out:
 512         return ret;
 513 }
 514
 515
 516 /*
 517  * Delayed work callback:
 518  * It is called at HVFB_UPDATE_DELAY or longer time interval to process
 519  * screen updates. It is re-scheduled if further update is necessary.
 520  */
 521 static void hvfb_update_work(struct work_struct *w)
 522 {
 523         struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work);
 524         struct fb_info *info = par->info;
 525
 526         if (par->fb_ready)
 527                 synthvid_update(info);
 528
 529         if (par->update)
 530                 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
 531 }
 532
 533
 534 /* Framebuffer operation handlers */
 535
 536 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 537 {
 538         if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN ||
 539             var->xres > screen_width || var->yres >  screen_height ||
 540             var->bits_per_pixel != screen_depth)
 541                 return -EINVAL;
 542
 543         var->xres_virtual = var->xres;
 544         var->yres_virtual = var->yres;
 545
 546         return 0;
 547 }
 548
 549 static int hvfb_set_par(struct fb_info *info)
 550 {
 551         struct hv_device *hdev = device_to_hv_device(info->device);
 552
 553         return synthvid_send_situ(hdev);
 554 }
 555
 556
 557 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf)
 558 {
 559         return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
 560 }
 561
 562 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 563                           unsigned blue, unsigned transp, struct fb_info *info)
 564 {
 565         u32 *pal = info->pseudo_palette;
 566
 567         if (regno > 15)
 568                 return -EINVAL;
 569
 570         pal[regno] = chan_to_field(red, &info->var.red)
 571                 | chan_to_field(green, &info->var.green)
 572                 | chan_to_field(blue, &info->var.blue)
 573                 | chan_to_field(transp, &info->var.transp);
 574
 575         return 0;
 576 }
 577
 578 static int hvfb_blank(int blank, struct fb_info *info)
 579 {
 580         return 1;       /* get fb_blank to set the colormap to all black */
 581 }
 582
 583 static struct fb_ops hvfb_ops = {
 584         .owner = THIS_MODULE,
 585         .fb_check_var = hvfb_check_var,
 586         .fb_set_par = hvfb_set_par,
 587         .fb_setcolreg = hvfb_setcolreg,
 588         .fb_fillrect = cfb_fillrect,
 589         .fb_copyarea = cfb_copyarea,
 590         .fb_imageblit = cfb_imageblit,
 591         .fb_blank = hvfb_blank,
 592 };
 593
 594
 595 /* Get options from kernel paramenter "video=" */
 596 static void hvfb_get_option(struct fb_info *info)
 597 {
 598         struct hvfb_par *par = info->par;
 599         char *opt = NULL, *p;
 600         uint x = 0, y = 0;
 601
 602         if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt)
 603                 return;
 604
 605         p = strsep(&opt, "x");
 606         if (!*p || kstrtouint(p, 0, &x) ||
 607             !opt || !*opt || kstrtouint(opt, 0, &y)) {
 608                 pr_err("Screen option is invalid: skipped\n");
 609                 return;
 610         }
 611
 612         if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN ||
 613             (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
 614              x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) ||
 615             (par->synthvid_version == SYNTHVID_VERSION_WIN7 &&
 616              (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) {
 617                 pr_err("Screen resolution option is out of range: skipped\n");
 618                 return;
 619         }
 620
 621         screen_width = x;
 622         screen_height = y;
 623         return;
 624 }
 625
 626
 627 /* Get framebuffer memory from Hyper-V video pci space */
 628 static int hvfb_getmem(struct fb_info *info)
 629 {
 630         struct pci_dev *pdev;
 631         ulong fb_phys;
 632         void __iomem *fb_virt;
 633
 634         pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
 635                               PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
 636         if (!pdev) {
 637                 pr_err("Unable to find PCI Hyper-V video\n");
 638                 return -ENODEV;
 639         }
 640
 641         if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) ||
 642             pci_resource_len(pdev, 0) < screen_fb_size)
 643                 goto err1;
 644
 645         fb_phys = pci_resource_end(pdev, 0) - screen_fb_size + 1;
 646         if (!request_mem_region(fb_phys, screen_fb_size, KBUILD_MODNAME))
 647                 goto err1;
 648
 649         fb_virt = ioremap(fb_phys, screen_fb_size);
 650         if (!fb_virt)
 651                 goto err2;
 652
 653         info->apertures = alloc_apertures(1);
 654         if (!info->apertures)
 655                 goto err3;
 656
 657         info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
 658         info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
 659         info->fix.smem_start = fb_phys;
 660         info->fix.smem_len = screen_fb_size;
 661         info->screen_base = fb_virt;
 662         info->screen_size = screen_fb_size;
 663
 664         pci_dev_put(pdev);
 665         return 0;
 666
 667 err3:
 668         iounmap(fb_virt);
 669 err2:
 670         release_mem_region(fb_phys, screen_fb_size);
 671 err1:
 672         pci_dev_put(pdev);
 673         return -ENOMEM;
 674 }
 675
 676 /* Release the framebuffer */
 677 static void hvfb_putmem(struct fb_info *info)
 678 {
 679         iounmap(info->screen_base);
 680         release_mem_region(info->fix.smem_start, screen_fb_size);
 681 }
 682
 683
 684 static int hvfb_probe(struct hv_device *hdev,
 685                       const struct hv_vmbus_device_id *dev_id)
 686 {
 687         struct fb_info *info;
 688         struct hvfb_par *par;
 689         int ret;
 690
 691         info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device);
 692         if (!info) {
 693                 pr_err("No memory for framebuffer info\n");
 694                 return -ENOMEM;
 695         }
 696
 697         par = info->par;
 698         par->info = info;
 699         par->fb_ready = false;
 700         init_completion(&par->wait);
 701         INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
 702
 703         /* Connect to VSP */
 704         hv_set_drvdata(hdev, info);
 705         ret = synthvid_connect_vsp(hdev);
 706         if (ret) {
 707                 pr_err("Unable to connect to VSP\n");
 708                 goto error1;
 709         }
 710
 711         ret = hvfb_getmem(info);
 712         if (ret) {
 713                 pr_err("No memory for framebuffer\n");
 714                 goto error2;
 715         }
 716
 717         hvfb_get_option(info);
 718         pr_info("Screen resolution: %dx%d, Color depth: %d\n",
 719                 screen_width, screen_height, screen_depth);
 720
 721
 722         /* Set up fb_info */
 723         info->flags = FBINFO_DEFAULT;
 724
 725         info->var.xres_virtual = info->var.xres = screen_width;
 726         info->var.yres_virtual = info->var.yres = screen_height;
 727         info->var.bits_per_pixel = screen_depth;
 728
 729         if (info->var.bits_per_pixel == 16) {
 730                 info->var.red = (struct fb_bitfield){11, 5, 0};
 731                 info->var.green = (struct fb_bitfield){5, 6, 0};
 732                 info->var.blue = (struct fb_bitfield){0, 5, 0};
 733                 info->var.transp = (struct fb_bitfield){0, 0, 0};
 734         } else {
 735                 info->var.red = (struct fb_bitfield){16, 8, 0};
 736                 info->var.green = (struct fb_bitfield){8, 8, 0};
 737                 info->var.blue = (struct fb_bitfield){0, 8, 0};
 738                 info->var.transp = (struct fb_bitfield){24, 8, 0};
 739         }
 740
 741         info->var.activate = FB_ACTIVATE_NOW;
 742         info->var.height = -1;
 743         info->var.width = -1;
 744         info->var.vmode = FB_VMODE_NONINTERLACED;
 745
 746         strcpy(info->fix.id, KBUILD_MODNAME);
 747         info->fix.type = FB_TYPE_PACKED_PIXELS;
 748         info->fix.visual = FB_VISUAL_TRUECOLOR;
 749         info->fix.line_length = screen_width * screen_depth / 8;
 750         info->fix.accel = FB_ACCEL_NONE;
 751
 752         info->fbops = &hvfb_ops;
 753         info->pseudo_palette = par->pseudo_palette;
 754
 755         /* Send config to host */
 756         ret = synthvid_send_config(hdev);
 757         if (ret)
 758                 goto error;
 759
 760         ret = register_framebuffer(info);
 761         if (ret) {
 762                 pr_err("Unable to register framebuffer\n");
 763                 goto error;
 764         }
 765
 766         par->fb_ready = true;
 767
 768         return 0;
 769
 770 error:
 771         hvfb_putmem(info);
 772 error2:
 773         vmbus_close(hdev->channel);
 774 error1:
 775         cancel_delayed_work_sync(&par->dwork);
 776         hv_set_drvdata(hdev, NULL);
 777         framebuffer_release(info);
 778         return ret;
 779 }
 780
 781
 782 static int hvfb_remove(struct hv_device *hdev)
 783 {
 784         struct fb_info *info = hv_get_drvdata(hdev);
 785         struct hvfb_par *par = info->par;
 786
 787         par->update = false;
 788         par->fb_ready = false;
 789
 790         unregister_framebuffer(info);
 791         cancel_delayed_work_sync(&par->dwork);
 792
 793         vmbus_close(hdev->channel);
 794         hv_set_drvdata(hdev, NULL);
 795
 796         hvfb_putmem(info);
 797         framebuffer_release(info);
 798
 799         return 0;
 800 }
 801
 802
 803 static DEFINE_PCI_DEVICE_TABLE(pci_stub_id_table) = {
 804         {
 805                 .vendor      = PCI_VENDOR_ID_MICROSOFT,
 806                 .device      = PCI_DEVICE_ID_HYPERV_VIDEO,
 807         },
 808         { /* end of list */ }
 809 };
 810
 811 static const struct hv_vmbus_device_id id_table[] = {
 812         /* Synthetic Video Device GUID */
 813         {HV_SYNTHVID_GUID},
 814         {}
 815 };
 816
 817 MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
 818 MODULE_DEVICE_TABLE(vmbus, id_table);
 819
 820 static struct hv_driver hvfb_drv = {
 821         .name = KBUILD_MODNAME,
 822         .id_table = id_table,
 823         .probe = hvfb_probe,
 824         .remove = hvfb_remove,
 825 };
 826
 827 static int hvfb_pci_stub_probe(struct pci_dev *pdev,
 828                                const struct pci_device_id *ent)
 829 {
 830         return 0;
 831 }
 832
 833 static void hvfb_pci_stub_remove(struct pci_dev *pdev)
 834 {
 835 }
 836
 837 static struct pci_driver hvfb_pci_stub_driver = {
 838         .name =         KBUILD_MODNAME,
 839         .id_table =     pci_stub_id_table,
 840         .probe =        hvfb_pci_stub_probe,
 841         .remove =       hvfb_pci_stub_remove,
 842 };
 843
 844 static int __init hvfb_drv_init(void)
 845 {
 846         int ret;
 847
 848         ret = vmbus_driver_register(&hvfb_drv);
 849         if (ret != 0)
 850                 return ret;
 851
 852         ret = pci_register_driver(&hvfb_pci_stub_driver);
 853         if (ret != 0) {
 854                 vmbus_driver_unregister(&hvfb_drv);
 855                 return ret;
 856         }
 857
 858         return 0;
 859 }
 860
 861 static void __exit hvfb_drv_exit(void)
 862 {
 863         pci_unregister_driver(&hvfb_pci_stub_driver);
 864         vmbus_driver_unregister(&hvfb_drv);
 865 }
 866
 867 module_init(hvfb_drv_init);
 868 module_exit(hvfb_drv_exit);
 869
 870 MODULE_LICENSE("GPL");
 871 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver");