linux/drivers/video/hyperv_fb.c
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   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
  69enum pipe_msg_type {
  70        PIPE_MSG_INVALID,
  71        PIPE_MSG_DATA,
  72        PIPE_MSG_MAX
  73};
  74
  75struct pipe_msg_hdr {
  76        u32 type;
  77        u32 size; /* size of message after this field */
  78} __packed;
  79
  80
  81enum 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
  97struct synthvid_msg_hdr {
  98        u32 type;
  99        u32 size;  /* size of this header + payload after this field*/
 100} __packed;
 101
 102
 103struct synthvid_version_req {
 104        u32 version;
 105} __packed;
 106
 107struct synthvid_version_resp {
 108        u32 version;
 109        u8 is_accepted;
 110        u8 max_video_outputs;
 111} __packed;
 112
 113struct synthvid_vram_location {
 114        u64 user_ctx;
 115        u8 is_vram_gpa_specified;
 116        u64 vram_gpa;
 117} __packed;
 118
 119struct synthvid_vram_location_ack {
 120        u64 user_ctx;
 121} __packed;
 122
 123struct 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
 132struct synthvid_situation_update {
 133        u64 user_ctx;
 134        u8 video_output_count;
 135        struct video_output_situation video_output[1];
 136} __packed;
 137
 138struct synthvid_situation_update_ack {
 139        u64 user_ctx;
 140} __packed;
 141
 142struct 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
 156struct 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
 166struct 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
 173struct rect {
 174        s32 x1, y1; /* top left corner */
 175        s32 x2, y2; /* bottom right corner, exclusive */
 176} __packed;
 177
 178struct synthvid_dirt {
 179        u8 video_output;
 180        u8 dirt_count;
 181        struct rect rect[1];
 182} __packed;
 183
 184struct 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
 213struct 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
 227static uint screen_width = HVFB_WIDTH;
 228static uint screen_height = HVFB_HEIGHT;
 229static uint screen_depth;
 230static uint screen_fb_size;
 231
 232/* Send message to Hyper-V host */
 233static 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 */
 255static 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 */
 283static 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 */
 317static 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 */
 345static 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 */
 379static 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 */
 406static 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
 433out:
 434        return ret;
 435}
 436
 437/* Connect to VSP (Virtual Service Provider) on host */
 438static 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
 473error:
 474        vmbus_close(hdev->channel);
 475        return ret;
 476}
 477
 478/* Send VRAM and Situation messages to the host */
 479static 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
 511out:
 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 */
 521static 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
 536static 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
 549static 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
 557static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf)
 558{
 559        return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
 560}
 561
 562static 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
 579static struct fb_ops hvfb_ops = {
 580        .owner = THIS_MODULE,
 581        .fb_check_var = hvfb_check_var,
 582        .fb_set_par = hvfb_set_par,
 583        .fb_setcolreg = hvfb_setcolreg,
 584        .fb_fillrect = cfb_fillrect,
 585        .fb_copyarea = cfb_copyarea,
 586        .fb_imageblit = cfb_imageblit,
 587};
 588
 589
 590/* Get options from kernel paramenter "video=" */
 591static void hvfb_get_option(struct fb_info *info)
 592{
 593        struct hvfb_par *par = info->par;
 594        char *opt = NULL, *p;
 595        uint x = 0, y = 0;
 596
 597        if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt)
 598                return;
 599
 600        p = strsep(&opt, "x");
 601        if (!*p || kstrtouint(p, 0, &x) ||
 602            !opt || !*opt || kstrtouint(opt, 0, &y)) {
 603                pr_err("Screen option is invalid: skipped\n");
 604                return;
 605        }
 606
 607        if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN ||
 608            (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
 609             x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) ||
 610            (par->synthvid_version == SYNTHVID_VERSION_WIN7 &&
 611             (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) {
 612                pr_err("Screen resolution option is out of range: skipped\n");
 613                return;
 614        }
 615
 616        screen_width = x;
 617        screen_height = y;
 618        return;
 619}
 620
 621
 622/* Get framebuffer memory from Hyper-V video pci space */
 623static int hvfb_getmem(struct fb_info *info)
 624{
 625        struct pci_dev *pdev;
 626        ulong fb_phys;
 627        void __iomem *fb_virt;
 628
 629        pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
 630                              PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
 631        if (!pdev) {
 632                pr_err("Unable to find PCI Hyper-V video\n");
 633                return -ENODEV;
 634        }
 635
 636        if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) ||
 637            pci_resource_len(pdev, 0) < screen_fb_size)
 638                goto err1;
 639
 640        fb_phys = pci_resource_end(pdev, 0) - screen_fb_size + 1;
 641        if (!request_mem_region(fb_phys, screen_fb_size, KBUILD_MODNAME))
 642                goto err1;
 643
 644        fb_virt = ioremap(fb_phys, screen_fb_size);
 645        if (!fb_virt)
 646                goto err2;
 647
 648        info->apertures = alloc_apertures(1);
 649        if (!info->apertures)
 650                goto err3;
 651
 652        info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
 653        info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
 654        info->fix.smem_start = fb_phys;
 655        info->fix.smem_len = screen_fb_size;
 656        info->screen_base = fb_virt;
 657        info->screen_size = screen_fb_size;
 658
 659        pci_dev_put(pdev);
 660        return 0;
 661
 662err3:
 663        iounmap(fb_virt);
 664err2:
 665        release_mem_region(fb_phys, screen_fb_size);
 666err1:
 667        pci_dev_put(pdev);
 668        return -ENOMEM;
 669}
 670
 671/* Release the framebuffer */
 672static void hvfb_putmem(struct fb_info *info)
 673{
 674        iounmap(info->screen_base);
 675        release_mem_region(info->fix.smem_start, screen_fb_size);
 676}
 677
 678
 679static int hvfb_probe(struct hv_device *hdev,
 680                      const struct hv_vmbus_device_id *dev_id)
 681{
 682        struct fb_info *info;
 683        struct hvfb_par *par;
 684        int ret;
 685
 686        info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device);
 687        if (!info) {
 688                pr_err("No memory for framebuffer info\n");
 689                return -ENOMEM;
 690        }
 691
 692        par = info->par;
 693        par->info = info;
 694        par->fb_ready = false;
 695        init_completion(&par->wait);
 696        INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
 697
 698        /* Connect to VSP */
 699        hv_set_drvdata(hdev, info);
 700        ret = synthvid_connect_vsp(hdev);
 701        if (ret) {
 702                pr_err("Unable to connect to VSP\n");
 703                goto error1;
 704        }
 705
 706        ret = hvfb_getmem(info);
 707        if (ret) {
 708                pr_err("No memory for framebuffer\n");
 709                goto error2;
 710        }
 711
 712        hvfb_get_option(info);
 713        pr_info("Screen resolution: %dx%d, Color depth: %d\n",
 714                screen_width, screen_height, screen_depth);
 715
 716
 717        /* Set up fb_info */
 718        info->flags = FBINFO_DEFAULT;
 719
 720        info->var.xres_virtual = info->var.xres = screen_width;
 721        info->var.yres_virtual = info->var.yres = screen_height;
 722        info->var.bits_per_pixel = screen_depth;
 723
 724        if (info->var.bits_per_pixel == 16) {
 725                info->var.red = (struct fb_bitfield){11, 5, 0};
 726                info->var.green = (struct fb_bitfield){5, 6, 0};
 727                info->var.blue = (struct fb_bitfield){0, 5, 0};
 728                info->var.transp = (struct fb_bitfield){0, 0, 0};
 729        } else {
 730                info->var.red = (struct fb_bitfield){16, 8, 0};
 731                info->var.green = (struct fb_bitfield){8, 8, 0};
 732                info->var.blue = (struct fb_bitfield){0, 8, 0};
 733                info->var.transp = (struct fb_bitfield){24, 8, 0};
 734        }
 735
 736        info->var.activate = FB_ACTIVATE_NOW;
 737        info->var.height = -1;
 738        info->var.width = -1;
 739        info->var.vmode = FB_VMODE_NONINTERLACED;
 740
 741        strcpy(info->fix.id, KBUILD_MODNAME);
 742        info->fix.type = FB_TYPE_PACKED_PIXELS;
 743        info->fix.visual = FB_VISUAL_TRUECOLOR;
 744        info->fix.line_length = screen_width * screen_depth / 8;
 745        info->fix.accel = FB_ACCEL_NONE;
 746
 747        info->fbops = &hvfb_ops;
 748        info->pseudo_palette = par->pseudo_palette;
 749
 750        /* Send config to host */
 751        ret = synthvid_send_config(hdev);
 752        if (ret)
 753                goto error;
 754
 755        ret = register_framebuffer(info);
 756        if (ret) {
 757                pr_err("Unable to register framebuffer\n");
 758                goto error;
 759        }
 760
 761        par->fb_ready = true;
 762
 763        return 0;
 764
 765error:
 766        hvfb_putmem(info);
 767error2:
 768        vmbus_close(hdev->channel);
 769error1:
 770        cancel_delayed_work_sync(&par->dwork);
 771        hv_set_drvdata(hdev, NULL);
 772        framebuffer_release(info);
 773        return ret;
 774}
 775
 776
 777static int hvfb_remove(struct hv_device *hdev)
 778{
 779        struct fb_info *info = hv_get_drvdata(hdev);
 780        struct hvfb_par *par = info->par;
 781
 782        par->update = false;
 783        par->fb_ready = false;
 784
 785        unregister_framebuffer(info);
 786        cancel_delayed_work_sync(&par->dwork);
 787
 788        vmbus_close(hdev->channel);
 789        hv_set_drvdata(hdev, NULL);
 790
 791        hvfb_putmem(info);
 792        framebuffer_release(info);
 793
 794        return 0;
 795}
 796
 797
 798static const struct hv_vmbus_device_id id_table[] = {
 799        /* Synthetic Video Device GUID */
 800        {HV_SYNTHVID_GUID},
 801        {}
 802};
 803
 804MODULE_DEVICE_TABLE(vmbus, id_table);
 805
 806static struct hv_driver hvfb_drv = {
 807        .name = KBUILD_MODNAME,
 808        .id_table = id_table,
 809        .probe = hvfb_probe,
 810        .remove = hvfb_remove,
 811};
 812
 813
 814static int __init hvfb_drv_init(void)
 815{
 816        return vmbus_driver_register(&hvfb_drv);
 817}
 818
 819static void __exit hvfb_drv_exit(void)
 820{
 821        vmbus_driver_unregister(&hvfb_drv);
 822}
 823
 824module_init(hvfb_drv_init);
 825module_exit(hvfb_drv_exit);
 826
 827MODULE_LICENSE("GPL");
 828MODULE_VERSION(HV_DRV_VERSION);
 829MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver");
 830
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