drivers/video/fbdev/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 #include <linux/efi.h>
  46
  47 #include <linux/hyperv.h>
  48
  49
  50 /* Hyper-V Synthetic Video Protocol definitions and structures */
  51 #define MAX_VMBUS_PKT_SIZE 0x4000
  52
  53 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
  54 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
  55 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
  56
  57 #define SYNTHVID_DEPTH_WIN7 16
  58 #define SYNTHVID_DEPTH_WIN8 32
  59
  60 #define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024)
  61 #define SYNTHVID_WIDTH_MAX_WIN7 1600
  62 #define SYNTHVID_HEIGHT_MAX_WIN7 1200
  63
  64 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
  65
  66 #define PCI_VENDOR_ID_MICROSOFT 0x1414
  67 #define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353
  68
  69
  70 enum pipe_msg_type {
  71         PIPE_MSG_INVALID,
  72         PIPE_MSG_DATA,
  73         PIPE_MSG_MAX
  74 };
  75
  76 struct pipe_msg_hdr {
  77         u32 type;
  78         u32 size; /* size of message after this field */
  79 } __packed;
  80
  81
  82 enum synthvid_msg_type {
  83         SYNTHVID_ERROR                  = 0,
  84         SYNTHVID_VERSION_REQUEST        = 1,
  85         SYNTHVID_VERSION_RESPONSE       = 2,
  86         SYNTHVID_VRAM_LOCATION          = 3,
  87         SYNTHVID_VRAM_LOCATION_ACK      = 4,
  88         SYNTHVID_SITUATION_UPDATE       = 5,
  89         SYNTHVID_SITUATION_UPDATE_ACK   = 6,
  90         SYNTHVID_POINTER_POSITION       = 7,
  91         SYNTHVID_POINTER_SHAPE          = 8,
  92         SYNTHVID_FEATURE_CHANGE         = 9,
  93         SYNTHVID_DIRT                   = 10,
  94
  95         SYNTHVID_MAX                    = 11
  96 };
  97
  98 struct synthvid_msg_hdr {
  99         u32 type;
 100         u32 size;  /* size of this header + payload after this field*/
 101 } __packed;
 102
 103
 104 struct synthvid_version_req {
 105         u32 version;
 106 } __packed;
 107
 108 struct synthvid_version_resp {
 109         u32 version;
 110         u8 is_accepted;
 111         u8 max_video_outputs;
 112 } __packed;
 113
 114 struct synthvid_vram_location {
 115         u64 user_ctx;
 116         u8 is_vram_gpa_specified;
 117         u64 vram_gpa;
 118 } __packed;
 119
 120 struct synthvid_vram_location_ack {
 121         u64 user_ctx;
 122 } __packed;
 123
 124 struct video_output_situation {
 125         u8 active;
 126         u32 vram_offset;
 127         u8 depth_bits;
 128         u32 width_pixels;
 129         u32 height_pixels;
 130         u32 pitch_bytes;
 131 } __packed;
 132
 133 struct synthvid_situation_update {
 134         u64 user_ctx;
 135         u8 video_output_count;
 136         struct video_output_situation video_output[1];
 137 } __packed;
 138
 139 struct synthvid_situation_update_ack {
 140         u64 user_ctx;
 141 } __packed;
 142
 143 struct synthvid_pointer_position {
 144         u8 is_visible;
 145         u8 video_output;
 146         s32 image_x;
 147         s32 image_y;
 148 } __packed;
 149
 150
 151 #define CURSOR_MAX_X 96
 152 #define CURSOR_MAX_Y 96
 153 #define CURSOR_ARGB_PIXEL_SIZE 4
 154 #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE)
 155 #define CURSOR_COMPLETE (-1)
 156
 157 struct synthvid_pointer_shape {
 158         u8 part_idx;
 159         u8 is_argb;
 160         u32 width; /* CURSOR_MAX_X at most */
 161         u32 height; /* CURSOR_MAX_Y at most */
 162         u32 hot_x; /* hotspot relative to upper-left of pointer image */
 163         u32 hot_y;
 164         u8 data[4];
 165 } __packed;
 166
 167 struct synthvid_feature_change {
 168         u8 is_dirt_needed;
 169         u8 is_ptr_pos_needed;
 170         u8 is_ptr_shape_needed;
 171         u8 is_situ_needed;
 172 } __packed;
 173
 174 struct rect {
 175         s32 x1, y1; /* top left corner */
 176         s32 x2, y2; /* bottom right corner, exclusive */
 177 } __packed;
 178
 179 struct synthvid_dirt {
 180         u8 video_output;
 181         u8 dirt_count;
 182         struct rect rect[1];
 183 } __packed;
 184
 185 struct synthvid_msg {
 186         struct pipe_msg_hdr pipe_hdr;
 187         struct synthvid_msg_hdr vid_hdr;
 188         union {
 189                 struct synthvid_version_req ver_req;
 190                 struct synthvid_version_resp ver_resp;
 191                 struct synthvid_vram_location vram;
 192                 struct synthvid_vram_location_ack vram_ack;
 193                 struct synthvid_situation_update situ;
 194                 struct synthvid_situation_update_ack situ_ack;
 195                 struct synthvid_pointer_position ptr_pos;
 196                 struct synthvid_pointer_shape ptr_shape;
 197                 struct synthvid_feature_change feature_chg;
 198                 struct synthvid_dirt dirt;
 199         };
 200 } __packed;
 201
 202
 203
 204 /* FB driver definitions and structures */
 205 #define HVFB_WIDTH 1152 /* default screen width */
 206 #define HVFB_HEIGHT 864 /* default screen height */
 207 #define HVFB_WIDTH_MIN 640
 208 #define HVFB_HEIGHT_MIN 480
 209
 210 #define RING_BUFSIZE (256 * 1024)
 211 #define VSP_TIMEOUT (10 * HZ)
 212 #define HVFB_UPDATE_DELAY (HZ / 20)
 213
 214 struct hvfb_par {
 215         struct fb_info *info;
 216         struct resource mem;
 217         bool fb_ready; /* fb device is ready */
 218         struct completion wait;
 219         u32 synthvid_version;
 220
 221         struct delayed_work dwork;
 222         bool update;
 223
 224         u32 pseudo_palette[16];
 225         u8 init_buf[MAX_VMBUS_PKT_SIZE];
 226         u8 recv_buf[MAX_VMBUS_PKT_SIZE];
 227
 228         /* If true, the VSC notifies the VSP on every framebuffer change */
 229         bool synchronous_fb;
 230
 231         struct notifier_block hvfb_panic_nb;
 232 };
 233
 234 static uint screen_width = HVFB_WIDTH;
 235 static uint screen_height = HVFB_HEIGHT;
 236 static uint screen_depth;
 237 static uint screen_fb_size;
 238
 239 /* Send message to Hyper-V host */
 240 static inline int synthvid_send(struct hv_device *hdev,
 241                                 struct synthvid_msg *msg)
 242 {
 243         static atomic64_t request_id = ATOMIC64_INIT(0);
 244         int ret;
 245
 246         msg->pipe_hdr.type = PIPE_MSG_DATA;
 247         msg->pipe_hdr.size = msg->vid_hdr.size;
 248
 249         ret = vmbus_sendpacket(hdev->channel, msg,
 250                                msg->vid_hdr.size + sizeof(struct pipe_msg_hdr),
 251                                atomic64_inc_return(&request_id),
 252                                VM_PKT_DATA_INBAND, 0);
 253
 254         if (ret)
 255                 pr_err("Unable to send packet via vmbus\n");
 256
 257         return ret;
 258 }
 259
 260
 261 /* Send screen resolution info to host */
 262 static int synthvid_send_situ(struct hv_device *hdev)
 263 {
 264         struct fb_info *info = hv_get_drvdata(hdev);
 265         struct synthvid_msg msg;
 266
 267         if (!info)
 268                 return -ENODEV;
 269
 270         memset(&msg, 0, sizeof(struct synthvid_msg));
 271
 272         msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
 273         msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 274                 sizeof(struct synthvid_situation_update);
 275         msg.situ.user_ctx = 0;
 276         msg.situ.video_output_count = 1;
 277         msg.situ.video_output[0].active = 1;
 278         msg.situ.video_output[0].vram_offset = 0;
 279         msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel;
 280         msg.situ.video_output[0].width_pixels = info->var.xres;
 281         msg.situ.video_output[0].height_pixels = info->var.yres;
 282         msg.situ.video_output[0].pitch_bytes = info->fix.line_length;
 283
 284         synthvid_send(hdev, &msg);
 285
 286         return 0;
 287 }
 288
 289 /* Send mouse pointer info to host */
 290 static int synthvid_send_ptr(struct hv_device *hdev)
 291 {
 292         struct synthvid_msg msg;
 293
 294         memset(&msg, 0, sizeof(struct synthvid_msg));
 295         msg.vid_hdr.type = SYNTHVID_POINTER_POSITION;
 296         msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 297                 sizeof(struct synthvid_pointer_position);
 298         msg.ptr_pos.is_visible = 1;
 299         msg.ptr_pos.video_output = 0;
 300         msg.ptr_pos.image_x = 0;
 301         msg.ptr_pos.image_y = 0;
 302         synthvid_send(hdev, &msg);
 303
 304         memset(&msg, 0, sizeof(struct synthvid_msg));
 305         msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE;
 306         msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 307                 sizeof(struct synthvid_pointer_shape);
 308         msg.ptr_shape.part_idx = CURSOR_COMPLETE;
 309         msg.ptr_shape.is_argb = 1;
 310         msg.ptr_shape.width = 1;
 311         msg.ptr_shape.height = 1;
 312         msg.ptr_shape.hot_x = 0;
 313         msg.ptr_shape.hot_y = 0;
 314         msg.ptr_shape.data[0] = 0;
 315         msg.ptr_shape.data[1] = 1;
 316         msg.ptr_shape.data[2] = 1;
 317         msg.ptr_shape.data[3] = 1;
 318         synthvid_send(hdev, &msg);
 319
 320         return 0;
 321 }
 322
 323 /* Send updated screen area (dirty rectangle) location to host */
 324 static int synthvid_update(struct fb_info *info)
 325 {
 326         struct hv_device *hdev = device_to_hv_device(info->device);
 327         struct synthvid_msg msg;
 328
 329         memset(&msg, 0, sizeof(struct synthvid_msg));
 330
 331         msg.vid_hdr.type = SYNTHVID_DIRT;
 332         msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 333                 sizeof(struct synthvid_dirt);
 334         msg.dirt.video_output = 0;
 335         msg.dirt.dirt_count = 1;
 336         msg.dirt.rect[0].x1 = 0;
 337         msg.dirt.rect[0].y1 = 0;
 338         msg.dirt.rect[0].x2 = info->var.xres;
 339         msg.dirt.rect[0].y2 = info->var.yres;
 340
 341         synthvid_send(hdev, &msg);
 342
 343         return 0;
 344 }
 345
 346
 347 /*
 348  * Actions on received messages from host:
 349  * Complete the wait event.
 350  * Or, reply with screen and cursor info.
 351  */
 352 static void synthvid_recv_sub(struct hv_device *hdev)
 353 {
 354         struct fb_info *info = hv_get_drvdata(hdev);
 355         struct hvfb_par *par;
 356         struct synthvid_msg *msg;
 357
 358         if (!info)
 359                 return;
 360
 361         par = info->par;
 362         msg = (struct synthvid_msg *)par->recv_buf;
 363
 364         /* Complete the wait event */
 365         if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
 366             msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
 367                 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE);
 368                 complete(&par->wait);
 369                 return;
 370         }
 371
 372         /* Reply with screen and cursor info */
 373         if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) {
 374                 if (par->fb_ready) {
 375                         synthvid_send_ptr(hdev);
 376                         synthvid_send_situ(hdev);
 377                 }
 378
 379                 par->update = msg->feature_chg.is_dirt_needed;
 380                 if (par->update)
 381                         schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
 382         }
 383 }
 384
 385 /* Receive callback for messages from the host */
 386 static void synthvid_receive(void *ctx)
 387 {
 388         struct hv_device *hdev = ctx;
 389         struct fb_info *info = hv_get_drvdata(hdev);
 390         struct hvfb_par *par;
 391         struct synthvid_msg *recv_buf;
 392         u32 bytes_recvd;
 393         u64 req_id;
 394         int ret;
 395
 396         if (!info)
 397                 return;
 398
 399         par = info->par;
 400         recv_buf = (struct synthvid_msg *)par->recv_buf;
 401
 402         do {
 403                 ret = vmbus_recvpacket(hdev->channel, recv_buf,
 404                                        MAX_VMBUS_PKT_SIZE,
 405                                        &bytes_recvd, &req_id);
 406                 if (bytes_recvd > 0 &&
 407                     recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
 408                         synthvid_recv_sub(hdev);
 409         } while (bytes_recvd > 0 && ret == 0);
 410 }
 411
 412 /* Check synthetic video protocol version with the host */
 413 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver)
 414 {
 415         struct fb_info *info = hv_get_drvdata(hdev);
 416         struct hvfb_par *par = info->par;
 417         struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
 418         int t, ret = 0;
 419
 420         memset(msg, 0, sizeof(struct synthvid_msg));
 421         msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
 422         msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 423                 sizeof(struct synthvid_version_req);
 424         msg->ver_req.version = ver;
 425         synthvid_send(hdev, msg);
 426
 427         t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
 428         if (!t) {
 429                 pr_err("Time out on waiting version response\n");
 430                 ret = -ETIMEDOUT;
 431                 goto out;
 432         }
 433         if (!msg->ver_resp.is_accepted) {
 434                 ret = -ENODEV;
 435                 goto out;
 436         }
 437
 438         par->synthvid_version = ver;
 439
 440 out:
 441         return ret;
 442 }
 443
 444 /* Connect to VSP (Virtual Service Provider) on host */
 445 static int synthvid_connect_vsp(struct hv_device *hdev)
 446 {
 447         struct fb_info *info = hv_get_drvdata(hdev);
 448         struct hvfb_par *par = info->par;
 449         int ret;
 450
 451         ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE,
 452                          NULL, 0, synthvid_receive, hdev);
 453         if (ret) {
 454                 pr_err("Unable to open vmbus channel\n");
 455                 return ret;
 456         }
 457
 458         /* Negotiate the protocol version with host */
 459         if (vmbus_proto_version == VERSION_WS2008 ||
 460             vmbus_proto_version == VERSION_WIN7)
 461                 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7);
 462         else
 463                 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8);
 464
 465         if (ret) {
 466                 pr_err("Synthetic video device version not accepted\n");
 467                 goto error;
 468         }
 469
 470         if (par->synthvid_version == SYNTHVID_VERSION_WIN7)
 471                 screen_depth = SYNTHVID_DEPTH_WIN7;
 472         else
 473                 screen_depth = SYNTHVID_DEPTH_WIN8;
 474
 475         screen_fb_size = hdev->channel->offermsg.offer.
 476                                 mmio_megabytes * 1024 * 1024;
 477
 478         return 0;
 479
 480 error:
 481         vmbus_close(hdev->channel);
 482         return ret;
 483 }
 484
 485 /* Send VRAM and Situation messages to the host */
 486 static int synthvid_send_config(struct hv_device *hdev)
 487 {
 488         struct fb_info *info = hv_get_drvdata(hdev);
 489         struct hvfb_par *par = info->par;
 490         struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
 491         int t, ret = 0;
 492
 493         /* Send VRAM location */
 494         memset(msg, 0, sizeof(struct synthvid_msg));
 495         msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
 496         msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
 497                 sizeof(struct synthvid_vram_location);
 498         msg->vram.user_ctx = msg->vram.vram_gpa = info->fix.smem_start;
 499         msg->vram.is_vram_gpa_specified = 1;
 500         synthvid_send(hdev, msg);
 501
 502         t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
 503         if (!t) {
 504                 pr_err("Time out on waiting vram location ack\n");
 505                 ret = -ETIMEDOUT;
 506                 goto out;
 507         }
 508         if (msg->vram_ack.user_ctx != info->fix.smem_start) {
 509                 pr_err("Unable to set VRAM location\n");
 510                 ret = -ENODEV;
 511                 goto out;
 512         }
 513
 514         /* Send pointer and situation update */
 515         synthvid_send_ptr(hdev);
 516         synthvid_send_situ(hdev);
 517
 518 out:
 519         return ret;
 520 }
 521
 522
 523 /*
 524  * Delayed work callback:
 525  * It is called at HVFB_UPDATE_DELAY or longer time interval to process
 526  * screen updates. It is re-scheduled if further update is necessary.
 527  */
 528 static void hvfb_update_work(struct work_struct *w)
 529 {
 530         struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work);
 531         struct fb_info *info = par->info;
 532
 533         if (par->fb_ready)
 534                 synthvid_update(info);
 535
 536         if (par->update)
 537                 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
 538 }
 539
 540 static int hvfb_on_panic(struct notifier_block *nb,
 541                          unsigned long e, void *p)
 542 {
 543         struct hvfb_par *par;
 544         struct fb_info *info;
 545
 546         par = container_of(nb, struct hvfb_par, hvfb_panic_nb);
 547         par->synchronous_fb = true;
 548         info = par->info;
 549         synthvid_update(info);
 550
 551         return NOTIFY_DONE;
 552 }
 553
 554 /* Framebuffer operation handlers */
 555
 556 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 557 {
 558         if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN ||
 559             var->xres > screen_width || var->yres >  screen_height ||
 560             var->bits_per_pixel != screen_depth)
 561                 return -EINVAL;
 562
 563         var->xres_virtual = var->xres;
 564         var->yres_virtual = var->yres;
 565
 566         return 0;
 567 }
 568
 569 static int hvfb_set_par(struct fb_info *info)
 570 {
 571         struct hv_device *hdev = device_to_hv_device(info->device);
 572
 573         return synthvid_send_situ(hdev);
 574 }
 575
 576
 577 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf)
 578 {
 579         return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
 580 }
 581
 582 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 583                           unsigned blue, unsigned transp, struct fb_info *info)
 584 {
 585         u32 *pal = info->pseudo_palette;
 586
 587         if (regno > 15)
 588                 return -EINVAL;
 589
 590         pal[regno] = chan_to_field(red, &info->var.red)
 591                 | chan_to_field(green, &info->var.green)
 592                 | chan_to_field(blue, &info->var.blue)
 593                 | chan_to_field(transp, &info->var.transp);
 594
 595         return 0;
 596 }
 597
 598 static int hvfb_blank(int blank, struct fb_info *info)
 599 {
 600         return 1;       /* get fb_blank to set the colormap to all black */
 601 }
 602
 603 static void hvfb_cfb_fillrect(struct fb_info *p,
 604                               const struct fb_fillrect *rect)
 605 {
 606         struct hvfb_par *par = p->par;
 607
 608         cfb_fillrect(p, rect);
 609         if (par->synchronous_fb)
 610                 synthvid_update(p);
 611 }
 612
 613 static void hvfb_cfb_copyarea(struct fb_info *p,
 614                               const struct fb_copyarea *area)
 615 {
 616         struct hvfb_par *par = p->par;
 617
 618         cfb_copyarea(p, area);
 619         if (par->synchronous_fb)
 620                 synthvid_update(p);
 621 }
 622
 623 static void hvfb_cfb_imageblit(struct fb_info *p,
 624                                const struct fb_image *image)
 625 {
 626         struct hvfb_par *par = p->par;
 627
 628         cfb_imageblit(p, image);
 629         if (par->synchronous_fb)
 630                 synthvid_update(p);
 631 }
 632
 633 static struct fb_ops hvfb_ops = {
 634         .owner = THIS_MODULE,
 635         .fb_check_var = hvfb_check_var,
 636         .fb_set_par = hvfb_set_par,
 637         .fb_setcolreg = hvfb_setcolreg,
 638         .fb_fillrect = hvfb_cfb_fillrect,
 639         .fb_copyarea = hvfb_cfb_copyarea,
 640         .fb_imageblit = hvfb_cfb_imageblit,
 641         .fb_blank = hvfb_blank,
 642 };
 643
 644
 645 /* Get options from kernel paramenter "video=" */
 646 static void hvfb_get_option(struct fb_info *info)
 647 {
 648         struct hvfb_par *par = info->par;
 649         char *opt = NULL, *p;
 650         uint x = 0, y = 0;
 651
 652         if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt)
 653                 return;
 654
 655         p = strsep(&opt, "x");
 656         if (!*p || kstrtouint(p, 0, &x) ||
 657             !opt || !*opt || kstrtouint(opt, 0, &y)) {
 658                 pr_err("Screen option is invalid: skipped\n");
 659                 return;
 660         }
 661
 662         if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN ||
 663             (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
 664              x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) ||
 665             (par->synthvid_version == SYNTHVID_VERSION_WIN7 &&
 666              (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) {
 667                 pr_err("Screen resolution option is out of range: skipped\n");
 668                 return;
 669         }
 670
 671         screen_width = x;
 672         screen_height = y;
 673         return;
 674 }
 675
 676
 677 /* Get framebuffer memory from Hyper-V video pci space */
 678 static int hvfb_getmem(struct fb_info *info)
 679 {
 680         struct hvfb_par *par = info->par;
 681         struct pci_dev *pdev  = NULL;
 682         void __iomem *fb_virt;
 683         int gen2vm = efi_enabled(EFI_BOOT);
 684         int ret;
 685
 686         par->mem.name = KBUILD_MODNAME;
 687         par->mem.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 688         if (gen2vm) {
 689                 ret = allocate_resource(&hyperv_mmio, &par->mem,
 690                                         screen_fb_size,
 691                                         0, -1,
 692                                         screen_fb_size,
 693                                         NULL, NULL);
 694                 if (ret != 0) {
 695                         pr_err("Unable to allocate framebuffer memory\n");
 696                         return -ENODEV;
 697                 }
 698         } else {
 699                 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
 700                               PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
 701                 if (!pdev) {
 702                         pr_err("Unable to find PCI Hyper-V video\n");
 703                         return -ENODEV;
 704                 }
 705
 706                 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) ||
 707                     pci_resource_len(pdev, 0) < screen_fb_size)
 708                         goto err1;
 709
 710                 par->mem.end = pci_resource_end(pdev, 0);
 711                 par->mem.start = par->mem.end - screen_fb_size + 1;
 712                 ret = request_resource(&pdev->resource[0], &par->mem);
 713                 if (ret != 0) {
 714                         pr_err("Unable to request framebuffer memory\n");
 715                         goto err1;
 716                 }
 717         }
 718
 719         fb_virt = ioremap(par->mem.start, screen_fb_size);
 720         if (!fb_virt)
 721                 goto err2;
 722
 723         info->apertures = alloc_apertures(1);
 724         if (!info->apertures)
 725                 goto err3;
 726
 727         if (gen2vm) {
 728                 info->apertures->ranges[0].base = screen_info.lfb_base;
 729                 info->apertures->ranges[0].size = screen_info.lfb_size;
 730                 remove_conflicting_framebuffers(info->apertures,
 731                                                 KBUILD_MODNAME, false);
 732         } else {
 733                 info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
 734                 info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
 735         }
 736
 737         info->fix.smem_start = par->mem.start;
 738         info->fix.smem_len = screen_fb_size;
 739         info->screen_base = fb_virt;
 740         info->screen_size = screen_fb_size;
 741
 742         if (!gen2vm)
 743                 pci_dev_put(pdev);
 744
 745         return 0;
 746
 747 err3:
 748         iounmap(fb_virt);
 749 err2:
 750         release_resource(&par->mem);
 751 err1:
 752         if (!gen2vm)
 753                 pci_dev_put(pdev);
 754
 755         return -ENOMEM;
 756 }
 757
 758 /* Release the framebuffer */
 759 static void hvfb_putmem(struct fb_info *info)
 760 {
 761         struct hvfb_par *par = info->par;
 762
 763         iounmap(info->screen_base);
 764         release_resource(&par->mem);
 765 }
 766
 767
 768 static int hvfb_probe(struct hv_device *hdev,
 769                       const struct hv_vmbus_device_id *dev_id)
 770 {
 771         struct fb_info *info;
 772         struct hvfb_par *par;
 773         int ret;
 774
 775         info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device);
 776         if (!info) {
 777                 pr_err("No memory for framebuffer info\n");
 778                 return -ENOMEM;
 779         }
 780
 781         par = info->par;
 782         par->info = info;
 783         par->fb_ready = false;
 784         init_completion(&par->wait);
 785         INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
 786
 787         /* Connect to VSP */
 788         hv_set_drvdata(hdev, info);
 789         ret = synthvid_connect_vsp(hdev);
 790         if (ret) {
 791                 pr_err("Unable to connect to VSP\n");
 792                 goto error1;
 793         }
 794
 795         ret = hvfb_getmem(info);
 796         if (ret) {
 797                 pr_err("No memory for framebuffer\n");
 798                 goto error2;
 799         }
 800
 801         hvfb_get_option(info);
 802         pr_info("Screen resolution: %dx%d, Color depth: %d\n",
 803                 screen_width, screen_height, screen_depth);
 804
 805
 806         /* Set up fb_info */
 807         info->flags = FBINFO_DEFAULT;
 808
 809         info->var.xres_virtual = info->var.xres = screen_width;
 810         info->var.yres_virtual = info->var.yres = screen_height;
 811         info->var.bits_per_pixel = screen_depth;
 812
 813         if (info->var.bits_per_pixel == 16) {
 814                 info->var.red = (struct fb_bitfield){11, 5, 0};
 815                 info->var.green = (struct fb_bitfield){5, 6, 0};
 816                 info->var.blue = (struct fb_bitfield){0, 5, 0};
 817                 info->var.transp = (struct fb_bitfield){0, 0, 0};
 818         } else {
 819                 info->var.red = (struct fb_bitfield){16, 8, 0};
 820                 info->var.green = (struct fb_bitfield){8, 8, 0};
 821                 info->var.blue = (struct fb_bitfield){0, 8, 0};
 822                 info->var.transp = (struct fb_bitfield){24, 8, 0};
 823         }
 824
 825         info->var.activate = FB_ACTIVATE_NOW;
 826         info->var.height = -1;
 827         info->var.width = -1;
 828         info->var.vmode = FB_VMODE_NONINTERLACED;
 829
 830         strcpy(info->fix.id, KBUILD_MODNAME);
 831         info->fix.type = FB_TYPE_PACKED_PIXELS;
 832         info->fix.visual = FB_VISUAL_TRUECOLOR;
 833         info->fix.line_length = screen_width * screen_depth / 8;
 834         info->fix.accel = FB_ACCEL_NONE;
 835
 836         info->fbops = &hvfb_ops;
 837         info->pseudo_palette = par->pseudo_palette;
 838
 839         /* Send config to host */
 840         ret = synthvid_send_config(hdev);
 841         if (ret)
 842                 goto error;
 843
 844         ret = register_framebuffer(info);
 845         if (ret) {
 846                 pr_err("Unable to register framebuffer\n");
 847                 goto error;
 848         }
 849
 850         par->fb_ready = true;
 851
 852         par->synchronous_fb = false;
 853         par->hvfb_panic_nb.notifier_call = hvfb_on_panic;
 854         atomic_notifier_chain_register(&panic_notifier_list,
 855                                        &par->hvfb_panic_nb);
 856
 857         return 0;
 858
 859 error:
 860         hvfb_putmem(info);
 861 error2:
 862         vmbus_close(hdev->channel);
 863 error1:
 864         cancel_delayed_work_sync(&par->dwork);
 865         hv_set_drvdata(hdev, NULL);
 866         framebuffer_release(info);
 867         return ret;
 868 }
 869
 870
 871 static int hvfb_remove(struct hv_device *hdev)
 872 {
 873         struct fb_info *info = hv_get_drvdata(hdev);
 874         struct hvfb_par *par = info->par;
 875
 876         atomic_notifier_chain_unregister(&panic_notifier_list,
 877                                          &par->hvfb_panic_nb);
 878
 879         par->update = false;
 880         par->fb_ready = false;
 881
 882         unregister_framebuffer(info);
 883         cancel_delayed_work_sync(&par->dwork);
 884
 885         vmbus_close(hdev->channel);
 886         hv_set_drvdata(hdev, NULL);
 887
 888         hvfb_putmem(info);
 889         framebuffer_release(info);
 890
 891         return 0;
 892 }
 893
 894
 895 static const struct pci_device_id pci_stub_id_table[] = {
 896         {
 897                 .vendor      = PCI_VENDOR_ID_MICROSOFT,
 898                 .device      = PCI_DEVICE_ID_HYPERV_VIDEO,
 899         },
 900         { /* end of list */ }
 901 };
 902
 903 static const struct hv_vmbus_device_id id_table[] = {
 904         /* Synthetic Video Device GUID */
 905         {HV_SYNTHVID_GUID},
 906         {}
 907 };
 908
 909 MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
 910 MODULE_DEVICE_TABLE(vmbus, id_table);
 911
 912 static struct hv_driver hvfb_drv = {
 913         .name = KBUILD_MODNAME,
 914         .id_table = id_table,
 915         .probe = hvfb_probe,
 916         .remove = hvfb_remove,
 917 };
 918
 919 static int hvfb_pci_stub_probe(struct pci_dev *pdev,
 920                                const struct pci_device_id *ent)
 921 {
 922         return 0;
 923 }
 924
 925 static void hvfb_pci_stub_remove(struct pci_dev *pdev)
 926 {
 927 }
 928
 929 static struct pci_driver hvfb_pci_stub_driver = {
 930         .name =         KBUILD_MODNAME,
 931         .id_table =     pci_stub_id_table,
 932         .probe =        hvfb_pci_stub_probe,
 933         .remove =       hvfb_pci_stub_remove,
 934 };
 935
 936 static int __init hvfb_drv_init(void)
 937 {
 938         int ret;
 939
 940         ret = vmbus_driver_register(&hvfb_drv);
 941         if (ret != 0)
 942                 return ret;
 943
 944         ret = pci_register_driver(&hvfb_pci_stub_driver);
 945         if (ret != 0) {
 946                 vmbus_driver_unregister(&hvfb_drv);
 947                 return ret;
 948         }
 949
 950         return 0;
 951 }
 952
 953 static void __exit hvfb_drv_exit(void)
 954 {
 955         pci_unregister_driver(&hvfb_pci_stub_driver);
 956         vmbus_driver_unregister(&hvfb_drv);
 957 }
 958
 959 module_init(hvfb_drv_init);
 960 module_exit(hvfb_drv_exit);
 961
 962 MODULE_LICENSE("GPL");
 963 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver");