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 ret = 0; 419 unsigned long t; 420 421 memset(msg, 0, sizeof(struct synthvid_msg)); 422 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST; 423 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 424 sizeof(struct synthvid_version_req); 425 msg->ver_req.version = ver; 426 synthvid_send(hdev, msg); 427 428 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 429 if (!t) { 430 pr_err("Time out on waiting version response\n"); 431 ret = -ETIMEDOUT; 432 goto out; 433 } 434 if (!msg->ver_resp.is_accepted) { 435 ret = -ENODEV; 436 goto out; 437 } 438 439 par->synthvid_version = ver; 440 441 out: 442 return ret; 443 } 444 445 /* Connect to VSP (Virtual Service Provider) on host */ 446 static int synthvid_connect_vsp(struct hv_device *hdev) 447 { 448 struct fb_info *info = hv_get_drvdata(hdev); 449 struct hvfb_par *par = info->par; 450 int ret; 451 452 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE, 453 NULL, 0, synthvid_receive, hdev); 454 if (ret) { 455 pr_err("Unable to open vmbus channel\n"); 456 return ret; 457 } 458 459 /* Negotiate the protocol version with host */ 460 if (vmbus_proto_version == VERSION_WS2008 || 461 vmbus_proto_version == VERSION_WIN7) 462 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7); 463 else 464 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8); 465 466 if (ret) { 467 pr_err("Synthetic video device version not accepted\n"); 468 goto error; 469 } 470 471 if (par->synthvid_version == SYNTHVID_VERSION_WIN7) 472 screen_depth = SYNTHVID_DEPTH_WIN7; 473 else 474 screen_depth = SYNTHVID_DEPTH_WIN8; 475 476 screen_fb_size = hdev->channel->offermsg.offer. 477 mmio_megabytes * 1024 * 1024; 478 479 return 0; 480 481 error: 482 vmbus_close(hdev->channel); 483 return ret; 484 } 485 486 /* Send VRAM and Situation messages to the host */ 487 static int synthvid_send_config(struct hv_device *hdev) 488 { 489 struct fb_info *info = hv_get_drvdata(hdev); 490 struct hvfb_par *par = info->par; 491 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 492 int ret = 0; 493 unsigned long t; 494 495 /* Send VRAM location */ 496 memset(msg, 0, sizeof(struct synthvid_msg)); 497 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION; 498 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 499 sizeof(struct synthvid_vram_location); 500 msg->vram.user_ctx = msg->vram.vram_gpa = info->fix.smem_start; 501 msg->vram.is_vram_gpa_specified = 1; 502 synthvid_send(hdev, msg); 503 504 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 505 if (!t) { 506 pr_err("Time out on waiting vram location ack\n"); 507 ret = -ETIMEDOUT; 508 goto out; 509 } 510 if (msg->vram_ack.user_ctx != info->fix.smem_start) { 511 pr_err("Unable to set VRAM location\n"); 512 ret = -ENODEV; 513 goto out; 514 } 515 516 /* Send pointer and situation update */ 517 synthvid_send_ptr(hdev); 518 synthvid_send_situ(hdev); 519 520 out: 521 return ret; 522 } 523 524 525 /* 526 * Delayed work callback: 527 * It is called at HVFB_UPDATE_DELAY or longer time interval to process 528 * screen updates. It is re-scheduled if further update is necessary. 529 */ 530 static void hvfb_update_work(struct work_struct *w) 531 { 532 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work); 533 struct fb_info *info = par->info; 534 535 if (par->fb_ready) 536 synthvid_update(info); 537 538 if (par->update) 539 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 540 } 541 542 static int hvfb_on_panic(struct notifier_block *nb, 543 unsigned long e, void *p) 544 { 545 struct hvfb_par *par; 546 struct fb_info *info; 547 548 par = container_of(nb, struct hvfb_par, hvfb_panic_nb); 549 par->synchronous_fb = true; 550 info = par->info; 551 synthvid_update(info); 552 553 return NOTIFY_DONE; 554 } 555 556 /* Framebuffer operation handlers */ 557 558 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 559 { 560 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN || 561 var->xres > screen_width || var->yres > screen_height || 562 var->bits_per_pixel != screen_depth) 563 return -EINVAL; 564 565 var->xres_virtual = var->xres; 566 var->yres_virtual = var->yres; 567 568 return 0; 569 } 570 571 static int hvfb_set_par(struct fb_info *info) 572 { 573 struct hv_device *hdev = device_to_hv_device(info->device); 574 575 return synthvid_send_situ(hdev); 576 } 577 578 579 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf) 580 { 581 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; 582 } 583 584 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green, 585 unsigned blue, unsigned transp, struct fb_info *info) 586 { 587 u32 *pal = info->pseudo_palette; 588 589 if (regno > 15) 590 return -EINVAL; 591 592 pal[regno] = chan_to_field(red, &info->var.red) 593 | chan_to_field(green, &info->var.green) 594 | chan_to_field(blue, &info->var.blue) 595 | chan_to_field(transp, &info->var.transp); 596 597 return 0; 598 } 599 600 static int hvfb_blank(int blank, struct fb_info *info) 601 { 602 return 1; /* get fb_blank to set the colormap to all black */ 603 } 604 605 static void hvfb_cfb_fillrect(struct fb_info *p, 606 const struct fb_fillrect *rect) 607 { 608 struct hvfb_par *par = p->par; 609 610 cfb_fillrect(p, rect); 611 if (par->synchronous_fb) 612 synthvid_update(p); 613 } 614 615 static void hvfb_cfb_copyarea(struct fb_info *p, 616 const struct fb_copyarea *area) 617 { 618 struct hvfb_par *par = p->par; 619 620 cfb_copyarea(p, area); 621 if (par->synchronous_fb) 622 synthvid_update(p); 623 } 624 625 static void hvfb_cfb_imageblit(struct fb_info *p, 626 const struct fb_image *image) 627 { 628 struct hvfb_par *par = p->par; 629 630 cfb_imageblit(p, image); 631 if (par->synchronous_fb) 632 synthvid_update(p); 633 } 634 635 static struct fb_ops hvfb_ops = { 636 .owner = THIS_MODULE, 637 .fb_check_var = hvfb_check_var, 638 .fb_set_par = hvfb_set_par, 639 .fb_setcolreg = hvfb_setcolreg, 640 .fb_fillrect = hvfb_cfb_fillrect, 641 .fb_copyarea = hvfb_cfb_copyarea, 642 .fb_imageblit = hvfb_cfb_imageblit, 643 .fb_blank = hvfb_blank, 644 }; 645 646 647 /* Get options from kernel paramenter "video=" */ 648 static void hvfb_get_option(struct fb_info *info) 649 { 650 struct hvfb_par *par = info->par; 651 char *opt = NULL, *p; 652 uint x = 0, y = 0; 653 654 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt) 655 return; 656 657 p = strsep(&opt, "x"); 658 if (!*p || kstrtouint(p, 0, &x) || 659 !opt || !*opt || kstrtouint(opt, 0, &y)) { 660 pr_err("Screen option is invalid: skipped\n"); 661 return; 662 } 663 664 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN || 665 (par->synthvid_version == SYNTHVID_VERSION_WIN8 && 666 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) || 667 (par->synthvid_version == SYNTHVID_VERSION_WIN7 && 668 (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) { 669 pr_err("Screen resolution option is out of range: skipped\n"); 670 return; 671 } 672 673 screen_width = x; 674 screen_height = y; 675 return; 676 } 677 678 679 /* Get framebuffer memory from Hyper-V video pci space */ 680 static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info) 681 { 682 struct hvfb_par *par = info->par; 683 struct pci_dev *pdev = NULL; 684 void __iomem *fb_virt; 685 int gen2vm = efi_enabled(EFI_BOOT); 686 resource_size_t pot_start, pot_end; 687 int ret; 688 689 if (gen2vm) { 690 pot_start = 0; 691 pot_end = -1; 692 } else { 693 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT, 694 PCI_DEVICE_ID_HYPERV_VIDEO, NULL); 695 if (!pdev) { 696 pr_err("Unable to find PCI Hyper-V video\n"); 697 return -ENODEV; 698 } 699 700 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) || 701 pci_resource_len(pdev, 0) < screen_fb_size) 702 goto err1; 703 704 pot_end = pci_resource_end(pdev, 0); 705 pot_start = pot_end - screen_fb_size + 1; 706 } 707 708 ret = vmbus_allocate_mmio(&par->mem, hdev, pot_start, pot_end, 709 screen_fb_size, 0x100000, true); 710 if (ret != 0) { 711 pr_err("Unable to allocate framebuffer memory\n"); 712 goto err1; 713 } 714 715 fb_virt = ioremap(par->mem->start, screen_fb_size); 716 if (!fb_virt) 717 goto err2; 718 719 info->apertures = alloc_apertures(1); 720 if (!info->apertures) 721 goto err3; 722 723 if (gen2vm) { 724 info->apertures->ranges[0].base = screen_info.lfb_base; 725 info->apertures->ranges[0].size = screen_info.lfb_size; 726 remove_conflicting_framebuffers(info->apertures, 727 KBUILD_MODNAME, false); 728 } else { 729 info->apertures->ranges[0].base = pci_resource_start(pdev, 0); 730 info->apertures->ranges[0].size = pci_resource_len(pdev, 0); 731 } 732 733 info->fix.smem_start = par->mem->start; 734 info->fix.smem_len = screen_fb_size; 735 info->screen_base = fb_virt; 736 info->screen_size = screen_fb_size; 737 738 if (!gen2vm) 739 pci_dev_put(pdev); 740 741 return 0; 742 743 err3: 744 iounmap(fb_virt); 745 err2: 746 release_mem_region(par->mem->start, screen_fb_size); 747 par->mem = NULL; 748 err1: 749 if (!gen2vm) 750 pci_dev_put(pdev); 751 752 return -ENOMEM; 753 } 754 755 /* Release the framebuffer */ 756 static void hvfb_putmem(struct fb_info *info) 757 { 758 struct hvfb_par *par = info->par; 759 760 iounmap(info->screen_base); 761 release_mem_region(par->mem->start, screen_fb_size); 762 par->mem = NULL; 763 } 764 765 766 static int hvfb_probe(struct hv_device *hdev, 767 const struct hv_vmbus_device_id *dev_id) 768 { 769 struct fb_info *info; 770 struct hvfb_par *par; 771 int ret; 772 773 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device); 774 if (!info) { 775 pr_err("No memory for framebuffer info\n"); 776 return -ENOMEM; 777 } 778 779 par = info->par; 780 par->info = info; 781 par->fb_ready = false; 782 init_completion(&par->wait); 783 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work); 784 785 /* Connect to VSP */ 786 hv_set_drvdata(hdev, info); 787 ret = synthvid_connect_vsp(hdev); 788 if (ret) { 789 pr_err("Unable to connect to VSP\n"); 790 goto error1; 791 } 792 793 ret = hvfb_getmem(hdev, info); 794 if (ret) { 795 pr_err("No memory for framebuffer\n"); 796 goto error2; 797 } 798 799 hvfb_get_option(info); 800 pr_info("Screen resolution: %dx%d, Color depth: %d\n", 801 screen_width, screen_height, screen_depth); 802 803 804 /* Set up fb_info */ 805 info->flags = FBINFO_DEFAULT; 806 807 info->var.xres_virtual = info->var.xres = screen_width; 808 info->var.yres_virtual = info->var.yres = screen_height; 809 info->var.bits_per_pixel = screen_depth; 810 811 if (info->var.bits_per_pixel == 16) { 812 info->var.red = (struct fb_bitfield){11, 5, 0}; 813 info->var.green = (struct fb_bitfield){5, 6, 0}; 814 info->var.blue = (struct fb_bitfield){0, 5, 0}; 815 info->var.transp = (struct fb_bitfield){0, 0, 0}; 816 } else { 817 info->var.red = (struct fb_bitfield){16, 8, 0}; 818 info->var.green = (struct fb_bitfield){8, 8, 0}; 819 info->var.blue = (struct fb_bitfield){0, 8, 0}; 820 info->var.transp = (struct fb_bitfield){24, 8, 0}; 821 } 822 823 info->var.activate = FB_ACTIVATE_NOW; 824 info->var.height = -1; 825 info->var.width = -1; 826 info->var.vmode = FB_VMODE_NONINTERLACED; 827 828 strcpy(info->fix.id, KBUILD_MODNAME); 829 info->fix.type = FB_TYPE_PACKED_PIXELS; 830 info->fix.visual = FB_VISUAL_TRUECOLOR; 831 info->fix.line_length = screen_width * screen_depth / 8; 832 info->fix.accel = FB_ACCEL_NONE; 833 834 info->fbops = &hvfb_ops; 835 info->pseudo_palette = par->pseudo_palette; 836 837 /* Send config to host */ 838 ret = synthvid_send_config(hdev); 839 if (ret) 840 goto error; 841 842 ret = register_framebuffer(info); 843 if (ret) { 844 pr_err("Unable to register framebuffer\n"); 845 goto error; 846 } 847 848 par->fb_ready = true; 849 850 par->synchronous_fb = false; 851 par->hvfb_panic_nb.notifier_call = hvfb_on_panic; 852 atomic_notifier_chain_register(&panic_notifier_list, 853 &par->hvfb_panic_nb); 854 855 return 0; 856 857 error: 858 hvfb_putmem(info); 859 error2: 860 vmbus_close(hdev->channel); 861 error1: 862 cancel_delayed_work_sync(&par->dwork); 863 hv_set_drvdata(hdev, NULL); 864 framebuffer_release(info); 865 return ret; 866 } 867 868 869 static int hvfb_remove(struct hv_device *hdev) 870 { 871 struct fb_info *info = hv_get_drvdata(hdev); 872 struct hvfb_par *par = info->par; 873 874 atomic_notifier_chain_unregister(&panic_notifier_list, 875 &par->hvfb_panic_nb); 876 877 par->update = false; 878 par->fb_ready = false; 879 880 unregister_framebuffer(info); 881 cancel_delayed_work_sync(&par->dwork); 882 883 vmbus_close(hdev->channel); 884 hv_set_drvdata(hdev, NULL); 885 886 hvfb_putmem(info); 887 framebuffer_release(info); 888 889 return 0; 890 } 891 892 893 static const struct pci_device_id pci_stub_id_table[] = { 894 { 895 .vendor = PCI_VENDOR_ID_MICROSOFT, 896 .device = PCI_DEVICE_ID_HYPERV_VIDEO, 897 }, 898 { /* end of list */ } 899 }; 900 901 static const struct hv_vmbus_device_id id_table[] = { 902 /* Synthetic Video Device GUID */ 903 {HV_SYNTHVID_GUID}, 904 {} 905 }; 906 907 MODULE_DEVICE_TABLE(pci, pci_stub_id_table); 908 MODULE_DEVICE_TABLE(vmbus, id_table); 909 910 static struct hv_driver hvfb_drv = { 911 .name = KBUILD_MODNAME, 912 .id_table = id_table, 913 .probe = hvfb_probe, 914 .remove = hvfb_remove, 915 }; 916 917 static int hvfb_pci_stub_probe(struct pci_dev *pdev, 918 const struct pci_device_id *ent) 919 { 920 return 0; 921 } 922 923 static void hvfb_pci_stub_remove(struct pci_dev *pdev) 924 { 925 } 926 927 static struct pci_driver hvfb_pci_stub_driver = { 928 .name = KBUILD_MODNAME, 929 .id_table = pci_stub_id_table, 930 .probe = hvfb_pci_stub_probe, 931 .remove = hvfb_pci_stub_remove, 932 }; 933 934 static int __init hvfb_drv_init(void) 935 { 936 int ret; 937 938 ret = vmbus_driver_register(&hvfb_drv); 939 if (ret != 0) 940 return ret; 941 942 ret = pci_register_driver(&hvfb_pci_stub_driver); 943 if (ret != 0) { 944 vmbus_driver_unregister(&hvfb_drv); 945 return ret; 946 } 947 948 return 0; 949 } 950 951 static void __exit hvfb_drv_exit(void) 952 { 953 pci_unregister_driver(&hvfb_pci_stub_driver); 954 vmbus_driver_unregister(&hvfb_drv); 955 } 956 957 module_init(hvfb_drv_init); 958 module_exit(hvfb_drv_exit); 959 960 MODULE_LICENSE("GPL"); 961 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver"); 962