1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2012, Microsoft Corporation. 4 * 5 * Author: 6 * Haiyang Zhang <haiyangz@microsoft.com> 7 */ 8 9 /* 10 * Hyper-V Synthetic Video Frame Buffer Driver 11 * 12 * This is the driver for the Hyper-V Synthetic Video, which supports 13 * screen resolution up to Full HD 1920x1080 with 32 bit color on Windows 14 * Server 2012, and 1600x1200 with 16 bit color on Windows Server 2008 R2 15 * or earlier. 16 * 17 * It also solves the double mouse cursor issue of the emulated video mode. 18 * 19 * The default screen resolution is 1152x864, which may be changed by a 20 * kernel parameter: 21 * video=hyperv_fb:<width>x<height> 22 * For example: video=hyperv_fb:1280x1024 23 * 24 * Portrait orientation is also supported: 25 * For example: video=hyperv_fb:864x1152 26 * 27 * When a Windows 10 RS5+ host is used, the virtual machine screen 28 * resolution is obtained from the host. The "video=hyperv_fb" option is 29 * not needed, but still can be used to overwrite what the host specifies. 30 * The VM resolution on the host could be set by executing the powershell 31 * "set-vmvideo" command. For example 32 * set-vmvideo -vmname name -horizontalresolution:1920 \ 33 * -verticalresolution:1200 -resolutiontype single 34 * 35 * Gen 1 VMs also support direct using VM's physical memory for framebuffer. 36 * It could improve the efficiency and performance for framebuffer and VM. 37 * This requires to allocate contiguous physical memory from Linux kernel's 38 * CMA memory allocator. To enable this, supply a kernel parameter to give 39 * enough memory space to CMA allocator for framebuffer. For example: 40 * cma=130m 41 * This gives 130MB memory to CMA allocator that can be allocated to 42 * framebuffer. For reference, 8K resolution (7680x4320) takes about 43 * 127MB memory. 44 */ 45 46 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 47 48 #include <linux/aperture.h> 49 #include <linux/module.h> 50 #include <linux/kernel.h> 51 #include <linux/vmalloc.h> 52 #include <linux/init.h> 53 #include <linux/completion.h> 54 #include <linux/fb.h> 55 #include <linux/pci.h> 56 #include <linux/panic_notifier.h> 57 #include <linux/efi.h> 58 #include <linux/console.h> 59 60 #include <linux/hyperv.h> 61 62 /* Hyper-V Synthetic Video Protocol definitions and structures */ 63 #define MAX_VMBUS_PKT_SIZE 0x4000 64 65 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major)) 66 /* Support for VERSION_WIN7 is removed. #define is retained for reference. */ 67 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0) 68 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2) 69 #define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5) 70 71 #define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff) 72 #define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16) 73 74 #define SYNTHVID_DEPTH_WIN8 32 75 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024) 76 77 enum pipe_msg_type { 78 PIPE_MSG_INVALID, 79 PIPE_MSG_DATA, 80 PIPE_MSG_MAX 81 }; 82 83 struct pipe_msg_hdr { 84 u32 type; 85 u32 size; /* size of message after this field */ 86 } __packed; 87 88 89 enum synthvid_msg_type { 90 SYNTHVID_ERROR = 0, 91 SYNTHVID_VERSION_REQUEST = 1, 92 SYNTHVID_VERSION_RESPONSE = 2, 93 SYNTHVID_VRAM_LOCATION = 3, 94 SYNTHVID_VRAM_LOCATION_ACK = 4, 95 SYNTHVID_SITUATION_UPDATE = 5, 96 SYNTHVID_SITUATION_UPDATE_ACK = 6, 97 SYNTHVID_POINTER_POSITION = 7, 98 SYNTHVID_POINTER_SHAPE = 8, 99 SYNTHVID_FEATURE_CHANGE = 9, 100 SYNTHVID_DIRT = 10, 101 SYNTHVID_RESOLUTION_REQUEST = 13, 102 SYNTHVID_RESOLUTION_RESPONSE = 14, 103 104 SYNTHVID_MAX = 15 105 }; 106 107 #define SYNTHVID_EDID_BLOCK_SIZE 128 108 #define SYNTHVID_MAX_RESOLUTION_COUNT 64 109 110 struct hvd_screen_info { 111 u16 width; 112 u16 height; 113 } __packed; 114 115 struct synthvid_msg_hdr { 116 u32 type; 117 u32 size; /* size of this header + payload after this field*/ 118 } __packed; 119 120 struct synthvid_version_req { 121 u32 version; 122 } __packed; 123 124 struct synthvid_version_resp { 125 u32 version; 126 u8 is_accepted; 127 u8 max_video_outputs; 128 } __packed; 129 130 struct synthvid_supported_resolution_req { 131 u8 maximum_resolution_count; 132 } __packed; 133 134 struct synthvid_supported_resolution_resp { 135 u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE]; 136 u8 resolution_count; 137 u8 default_resolution_index; 138 u8 is_standard; 139 struct hvd_screen_info 140 supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT]; 141 } __packed; 142 143 struct synthvid_vram_location { 144 u64 user_ctx; 145 u8 is_vram_gpa_specified; 146 u64 vram_gpa; 147 } __packed; 148 149 struct synthvid_vram_location_ack { 150 u64 user_ctx; 151 } __packed; 152 153 struct video_output_situation { 154 u8 active; 155 u32 vram_offset; 156 u8 depth_bits; 157 u32 width_pixels; 158 u32 height_pixels; 159 u32 pitch_bytes; 160 } __packed; 161 162 struct synthvid_situation_update { 163 u64 user_ctx; 164 u8 video_output_count; 165 struct video_output_situation video_output[1]; 166 } __packed; 167 168 struct synthvid_situation_update_ack { 169 u64 user_ctx; 170 } __packed; 171 172 struct synthvid_pointer_position { 173 u8 is_visible; 174 u8 video_output; 175 s32 image_x; 176 s32 image_y; 177 } __packed; 178 179 180 #define CURSOR_MAX_X 96 181 #define CURSOR_MAX_Y 96 182 #define CURSOR_ARGB_PIXEL_SIZE 4 183 #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE) 184 #define CURSOR_COMPLETE (-1) 185 186 struct synthvid_pointer_shape { 187 u8 part_idx; 188 u8 is_argb; 189 u32 width; /* CURSOR_MAX_X at most */ 190 u32 height; /* CURSOR_MAX_Y at most */ 191 u32 hot_x; /* hotspot relative to upper-left of pointer image */ 192 u32 hot_y; 193 u8 data[4]; 194 } __packed; 195 196 struct synthvid_feature_change { 197 u8 is_dirt_needed; 198 u8 is_ptr_pos_needed; 199 u8 is_ptr_shape_needed; 200 u8 is_situ_needed; 201 } __packed; 202 203 struct rect { 204 s32 x1, y1; /* top left corner */ 205 s32 x2, y2; /* bottom right corner, exclusive */ 206 } __packed; 207 208 struct synthvid_dirt { 209 u8 video_output; 210 u8 dirt_count; 211 struct rect rect[1]; 212 } __packed; 213 214 struct synthvid_msg { 215 struct pipe_msg_hdr pipe_hdr; 216 struct synthvid_msg_hdr vid_hdr; 217 union { 218 struct synthvid_version_req ver_req; 219 struct synthvid_version_resp ver_resp; 220 struct synthvid_vram_location vram; 221 struct synthvid_vram_location_ack vram_ack; 222 struct synthvid_situation_update situ; 223 struct synthvid_situation_update_ack situ_ack; 224 struct synthvid_pointer_position ptr_pos; 225 struct synthvid_pointer_shape ptr_shape; 226 struct synthvid_feature_change feature_chg; 227 struct synthvid_dirt dirt; 228 struct synthvid_supported_resolution_req resolution_req; 229 struct synthvid_supported_resolution_resp resolution_resp; 230 }; 231 } __packed; 232 233 234 /* FB driver definitions and structures */ 235 #define HVFB_WIDTH 1152 /* default screen width */ 236 #define HVFB_HEIGHT 864 /* default screen height */ 237 #define HVFB_WIDTH_MIN 640 238 #define HVFB_HEIGHT_MIN 480 239 240 #define RING_BUFSIZE (256 * 1024) 241 #define VSP_TIMEOUT (10 * HZ) 242 #define HVFB_UPDATE_DELAY (HZ / 20) 243 #define HVFB_ONDEMAND_THROTTLE (HZ / 20) 244 245 struct hvfb_par { 246 struct fb_info *info; 247 struct resource *mem; 248 bool fb_ready; /* fb device is ready */ 249 struct completion wait; 250 u32 synthvid_version; 251 252 struct delayed_work dwork; 253 bool update; 254 bool update_saved; /* The value of 'update' before hibernation */ 255 256 u32 pseudo_palette[16]; 257 u8 init_buf[MAX_VMBUS_PKT_SIZE]; 258 u8 recv_buf[MAX_VMBUS_PKT_SIZE]; 259 260 /* If true, the VSC notifies the VSP on every framebuffer change */ 261 bool synchronous_fb; 262 263 /* If true, need to copy from deferred IO mem to framebuffer mem */ 264 bool need_docopy; 265 266 struct notifier_block hvfb_panic_nb; 267 268 /* Memory for deferred IO and frame buffer itself */ 269 unsigned char *dio_vp; 270 unsigned char *mmio_vp; 271 phys_addr_t mmio_pp; 272 273 /* Dirty rectangle, protected by delayed_refresh_lock */ 274 int x1, y1, x2, y2; 275 bool delayed_refresh; 276 spinlock_t delayed_refresh_lock; 277 }; 278 279 static uint screen_width = HVFB_WIDTH; 280 static uint screen_height = HVFB_HEIGHT; 281 static uint screen_depth; 282 static uint screen_fb_size; 283 static uint dio_fb_size; /* FB size for deferred IO */ 284 285 /* Send message to Hyper-V host */ 286 static inline int synthvid_send(struct hv_device *hdev, 287 struct synthvid_msg *msg) 288 { 289 static atomic64_t request_id = ATOMIC64_INIT(0); 290 int ret; 291 292 msg->pipe_hdr.type = PIPE_MSG_DATA; 293 msg->pipe_hdr.size = msg->vid_hdr.size; 294 295 ret = vmbus_sendpacket(hdev->channel, msg, 296 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr), 297 atomic64_inc_return(&request_id), 298 VM_PKT_DATA_INBAND, 0); 299 300 if (ret) 301 pr_err_ratelimited("Unable to send packet via vmbus; error %d\n", ret); 302 303 return ret; 304 } 305 306 307 /* Send screen resolution info to host */ 308 static int synthvid_send_situ(struct hv_device *hdev) 309 { 310 struct fb_info *info = hv_get_drvdata(hdev); 311 struct synthvid_msg msg; 312 313 if (!info) 314 return -ENODEV; 315 316 memset(&msg, 0, sizeof(struct synthvid_msg)); 317 318 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE; 319 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 320 sizeof(struct synthvid_situation_update); 321 msg.situ.user_ctx = 0; 322 msg.situ.video_output_count = 1; 323 msg.situ.video_output[0].active = 1; 324 msg.situ.video_output[0].vram_offset = 0; 325 msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel; 326 msg.situ.video_output[0].width_pixels = info->var.xres; 327 msg.situ.video_output[0].height_pixels = info->var.yres; 328 msg.situ.video_output[0].pitch_bytes = info->fix.line_length; 329 330 synthvid_send(hdev, &msg); 331 332 return 0; 333 } 334 335 /* Send mouse pointer info to host */ 336 static int synthvid_send_ptr(struct hv_device *hdev) 337 { 338 struct synthvid_msg msg; 339 340 memset(&msg, 0, sizeof(struct synthvid_msg)); 341 msg.vid_hdr.type = SYNTHVID_POINTER_POSITION; 342 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 343 sizeof(struct synthvid_pointer_position); 344 msg.ptr_pos.is_visible = 1; 345 msg.ptr_pos.video_output = 0; 346 msg.ptr_pos.image_x = 0; 347 msg.ptr_pos.image_y = 0; 348 synthvid_send(hdev, &msg); 349 350 memset(&msg, 0, sizeof(struct synthvid_msg)); 351 msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE; 352 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 353 sizeof(struct synthvid_pointer_shape); 354 msg.ptr_shape.part_idx = CURSOR_COMPLETE; 355 msg.ptr_shape.is_argb = 1; 356 msg.ptr_shape.width = 1; 357 msg.ptr_shape.height = 1; 358 msg.ptr_shape.hot_x = 0; 359 msg.ptr_shape.hot_y = 0; 360 msg.ptr_shape.data[0] = 0; 361 msg.ptr_shape.data[1] = 1; 362 msg.ptr_shape.data[2] = 1; 363 msg.ptr_shape.data[3] = 1; 364 synthvid_send(hdev, &msg); 365 366 return 0; 367 } 368 369 /* Send updated screen area (dirty rectangle) location to host */ 370 static int 371 synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2) 372 { 373 struct hv_device *hdev = device_to_hv_device(info->device); 374 struct synthvid_msg msg; 375 376 memset(&msg, 0, sizeof(struct synthvid_msg)); 377 if (x2 == INT_MAX) 378 x2 = info->var.xres; 379 if (y2 == INT_MAX) 380 y2 = info->var.yres; 381 382 msg.vid_hdr.type = SYNTHVID_DIRT; 383 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 384 sizeof(struct synthvid_dirt); 385 msg.dirt.video_output = 0; 386 msg.dirt.dirt_count = 1; 387 msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1; 388 msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1; 389 msg.dirt.rect[0].x2 = 390 (x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2; 391 msg.dirt.rect[0].y2 = 392 (y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2; 393 394 synthvid_send(hdev, &msg); 395 396 return 0; 397 } 398 399 static void hvfb_docopy(struct hvfb_par *par, 400 unsigned long offset, 401 unsigned long size) 402 { 403 if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready || 404 size == 0 || offset >= dio_fb_size) 405 return; 406 407 if (offset + size > dio_fb_size) 408 size = dio_fb_size - offset; 409 410 memcpy(par->mmio_vp + offset, par->dio_vp + offset, size); 411 } 412 413 /* Deferred IO callback */ 414 static void synthvid_deferred_io(struct fb_info *p, struct list_head *pagereflist) 415 { 416 struct hvfb_par *par = p->par; 417 struct fb_deferred_io_pageref *pageref; 418 unsigned long start, end; 419 int y1, y2, miny, maxy; 420 421 miny = INT_MAX; 422 maxy = 0; 423 424 /* 425 * Merge dirty pages. It is possible that last page cross 426 * over the end of frame buffer row yres. This is taken care of 427 * in synthvid_update function by clamping the y2 428 * value to yres. 429 */ 430 list_for_each_entry(pageref, pagereflist, list) { 431 start = pageref->offset; 432 end = start + PAGE_SIZE - 1; 433 y1 = start / p->fix.line_length; 434 y2 = end / p->fix.line_length; 435 miny = min_t(int, miny, y1); 436 maxy = max_t(int, maxy, y2); 437 438 /* Copy from dio space to mmio address */ 439 if (par->fb_ready && par->need_docopy) 440 hvfb_docopy(par, start, PAGE_SIZE); 441 } 442 443 if (par->fb_ready && par->update) 444 synthvid_update(p, 0, miny, p->var.xres, maxy + 1); 445 } 446 447 static struct fb_deferred_io synthvid_defio = { 448 .delay = HZ / 20, 449 .deferred_io = synthvid_deferred_io, 450 }; 451 452 /* 453 * Actions on received messages from host: 454 * Complete the wait event. 455 * Or, reply with screen and cursor info. 456 */ 457 static void synthvid_recv_sub(struct hv_device *hdev) 458 { 459 struct fb_info *info = hv_get_drvdata(hdev); 460 struct hvfb_par *par; 461 struct synthvid_msg *msg; 462 463 if (!info) 464 return; 465 466 par = info->par; 467 msg = (struct synthvid_msg *)par->recv_buf; 468 469 /* Complete the wait event */ 470 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE || 471 msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE || 472 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) { 473 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE); 474 complete(&par->wait); 475 return; 476 } 477 478 /* Reply with screen and cursor info */ 479 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) { 480 if (par->fb_ready) { 481 synthvid_send_ptr(hdev); 482 synthvid_send_situ(hdev); 483 } 484 485 par->update = msg->feature_chg.is_dirt_needed; 486 if (par->update) 487 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 488 } 489 } 490 491 /* Receive callback for messages from the host */ 492 static void synthvid_receive(void *ctx) 493 { 494 struct hv_device *hdev = ctx; 495 struct fb_info *info = hv_get_drvdata(hdev); 496 struct hvfb_par *par; 497 struct synthvid_msg *recv_buf; 498 u32 bytes_recvd; 499 u64 req_id; 500 int ret; 501 502 if (!info) 503 return; 504 505 par = info->par; 506 recv_buf = (struct synthvid_msg *)par->recv_buf; 507 508 do { 509 ret = vmbus_recvpacket(hdev->channel, recv_buf, 510 MAX_VMBUS_PKT_SIZE, 511 &bytes_recvd, &req_id); 512 if (bytes_recvd > 0 && 513 recv_buf->pipe_hdr.type == PIPE_MSG_DATA) 514 synthvid_recv_sub(hdev); 515 } while (bytes_recvd > 0 && ret == 0); 516 } 517 518 /* Check if the ver1 version is equal or greater than ver2 */ 519 static inline bool synthvid_ver_ge(u32 ver1, u32 ver2) 520 { 521 if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) || 522 (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) && 523 SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2))) 524 return true; 525 526 return false; 527 } 528 529 /* Check synthetic video protocol version with the host */ 530 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver) 531 { 532 struct fb_info *info = hv_get_drvdata(hdev); 533 struct hvfb_par *par = info->par; 534 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 535 int ret = 0; 536 unsigned long t; 537 538 memset(msg, 0, sizeof(struct synthvid_msg)); 539 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST; 540 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 541 sizeof(struct synthvid_version_req); 542 msg->ver_req.version = ver; 543 synthvid_send(hdev, msg); 544 545 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 546 if (!t) { 547 pr_err("Time out on waiting version response\n"); 548 ret = -ETIMEDOUT; 549 goto out; 550 } 551 if (!msg->ver_resp.is_accepted) { 552 ret = -ENODEV; 553 goto out; 554 } 555 556 par->synthvid_version = ver; 557 pr_info("Synthvid Version major %d, minor %d\n", 558 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver)); 559 560 out: 561 return ret; 562 } 563 564 /* Get current resolution from the host */ 565 static int synthvid_get_supported_resolution(struct hv_device *hdev) 566 { 567 struct fb_info *info = hv_get_drvdata(hdev); 568 struct hvfb_par *par = info->par; 569 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 570 int ret = 0; 571 unsigned long t; 572 u8 index; 573 574 memset(msg, 0, sizeof(struct synthvid_msg)); 575 msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST; 576 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 577 sizeof(struct synthvid_supported_resolution_req); 578 579 msg->resolution_req.maximum_resolution_count = 580 SYNTHVID_MAX_RESOLUTION_COUNT; 581 synthvid_send(hdev, msg); 582 583 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 584 if (!t) { 585 pr_err("Time out on waiting resolution response\n"); 586 ret = -ETIMEDOUT; 587 goto out; 588 } 589 590 if (msg->resolution_resp.resolution_count == 0) { 591 pr_err("No supported resolutions\n"); 592 ret = -ENODEV; 593 goto out; 594 } 595 596 index = msg->resolution_resp.default_resolution_index; 597 if (index >= msg->resolution_resp.resolution_count) { 598 pr_err("Invalid resolution index: %d\n", index); 599 ret = -ENODEV; 600 goto out; 601 } 602 603 screen_width = 604 msg->resolution_resp.supported_resolution[index].width; 605 screen_height = 606 msg->resolution_resp.supported_resolution[index].height; 607 608 out: 609 return ret; 610 } 611 612 /* Connect to VSP (Virtual Service Provider) on host */ 613 static int synthvid_connect_vsp(struct hv_device *hdev) 614 { 615 struct fb_info *info = hv_get_drvdata(hdev); 616 struct hvfb_par *par = info->par; 617 int ret; 618 619 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE, 620 NULL, 0, synthvid_receive, hdev); 621 if (ret) { 622 pr_err("Unable to open vmbus channel\n"); 623 return ret; 624 } 625 626 /* Negotiate the protocol version with host */ 627 switch (vmbus_proto_version) { 628 case VERSION_WIN10: 629 case VERSION_WIN10_V5: 630 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 631 if (!ret) 632 break; 633 fallthrough; 634 case VERSION_WIN8: 635 case VERSION_WIN8_1: 636 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8); 637 break; 638 default: 639 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 640 break; 641 } 642 643 if (ret) { 644 pr_err("Synthetic video device version not accepted\n"); 645 goto error; 646 } 647 648 screen_depth = SYNTHVID_DEPTH_WIN8; 649 if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) { 650 ret = synthvid_get_supported_resolution(hdev); 651 if (ret) 652 pr_info("Failed to get supported resolution from host, use default\n"); 653 } 654 655 screen_fb_size = hdev->channel->offermsg.offer. 656 mmio_megabytes * 1024 * 1024; 657 658 return 0; 659 660 error: 661 vmbus_close(hdev->channel); 662 return ret; 663 } 664 665 /* Send VRAM and Situation messages to the host */ 666 static int synthvid_send_config(struct hv_device *hdev) 667 { 668 struct fb_info *info = hv_get_drvdata(hdev); 669 struct hvfb_par *par = info->par; 670 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 671 int ret = 0; 672 unsigned long t; 673 674 /* Send VRAM location */ 675 memset(msg, 0, sizeof(struct synthvid_msg)); 676 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION; 677 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 678 sizeof(struct synthvid_vram_location); 679 msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp; 680 msg->vram.is_vram_gpa_specified = 1; 681 synthvid_send(hdev, msg); 682 683 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 684 if (!t) { 685 pr_err("Time out on waiting vram location ack\n"); 686 ret = -ETIMEDOUT; 687 goto out; 688 } 689 if (msg->vram_ack.user_ctx != par->mmio_pp) { 690 pr_err("Unable to set VRAM location\n"); 691 ret = -ENODEV; 692 goto out; 693 } 694 695 /* Send pointer and situation update */ 696 synthvid_send_ptr(hdev); 697 synthvid_send_situ(hdev); 698 699 out: 700 return ret; 701 } 702 703 704 /* 705 * Delayed work callback: 706 * It is scheduled to call whenever update request is received and it has 707 * not been called in last HVFB_ONDEMAND_THROTTLE time interval. 708 */ 709 static void hvfb_update_work(struct work_struct *w) 710 { 711 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work); 712 struct fb_info *info = par->info; 713 unsigned long flags; 714 int x1, x2, y1, y2; 715 int j; 716 717 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 718 /* Reset the request flag */ 719 par->delayed_refresh = false; 720 721 /* Store the dirty rectangle to local variables */ 722 x1 = par->x1; 723 x2 = par->x2; 724 y1 = par->y1; 725 y2 = par->y2; 726 727 /* Clear dirty rectangle */ 728 par->x1 = par->y1 = INT_MAX; 729 par->x2 = par->y2 = 0; 730 731 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 732 733 if (x1 > info->var.xres || x2 > info->var.xres || 734 y1 > info->var.yres || y2 > info->var.yres || x2 <= x1) 735 return; 736 737 /* Copy the dirty rectangle to frame buffer memory */ 738 if (par->need_docopy) 739 for (j = y1; j < y2; j++) 740 hvfb_docopy(par, 741 j * info->fix.line_length + 742 (x1 * screen_depth / 8), 743 (x2 - x1) * screen_depth / 8); 744 745 /* Refresh */ 746 if (par->fb_ready && par->update) 747 synthvid_update(info, x1, y1, x2, y2); 748 } 749 750 /* 751 * Control the on-demand refresh frequency. It schedules a delayed 752 * screen update if it has not yet. 753 */ 754 static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par, 755 int x1, int y1, int w, int h) 756 { 757 unsigned long flags; 758 int x2 = x1 + w; 759 int y2 = y1 + h; 760 761 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 762 763 /* Merge dirty rectangle */ 764 par->x1 = min_t(int, par->x1, x1); 765 par->y1 = min_t(int, par->y1, y1); 766 par->x2 = max_t(int, par->x2, x2); 767 par->y2 = max_t(int, par->y2, y2); 768 769 /* Schedule a delayed screen update if not yet */ 770 if (par->delayed_refresh == false) { 771 schedule_delayed_work(&par->dwork, 772 HVFB_ONDEMAND_THROTTLE); 773 par->delayed_refresh = true; 774 } 775 776 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 777 } 778 779 static int hvfb_on_panic(struct notifier_block *nb, 780 unsigned long e, void *p) 781 { 782 struct hvfb_par *par; 783 struct fb_info *info; 784 785 par = container_of(nb, struct hvfb_par, hvfb_panic_nb); 786 par->synchronous_fb = true; 787 info = par->info; 788 if (par->need_docopy) 789 hvfb_docopy(par, 0, dio_fb_size); 790 synthvid_update(info, 0, 0, INT_MAX, INT_MAX); 791 792 return NOTIFY_DONE; 793 } 794 795 /* Framebuffer operation handlers */ 796 797 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 798 { 799 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN || 800 var->xres > screen_width || var->yres > screen_height || 801 var->bits_per_pixel != screen_depth) 802 return -EINVAL; 803 804 var->xres_virtual = var->xres; 805 var->yres_virtual = var->yres; 806 807 return 0; 808 } 809 810 static int hvfb_set_par(struct fb_info *info) 811 { 812 struct hv_device *hdev = device_to_hv_device(info->device); 813 814 return synthvid_send_situ(hdev); 815 } 816 817 818 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf) 819 { 820 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; 821 } 822 823 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green, 824 unsigned blue, unsigned transp, struct fb_info *info) 825 { 826 u32 *pal = info->pseudo_palette; 827 828 if (regno > 15) 829 return -EINVAL; 830 831 pal[regno] = chan_to_field(red, &info->var.red) 832 | chan_to_field(green, &info->var.green) 833 | chan_to_field(blue, &info->var.blue) 834 | chan_to_field(transp, &info->var.transp); 835 836 return 0; 837 } 838 839 static int hvfb_blank(int blank, struct fb_info *info) 840 { 841 return 1; /* get fb_blank to set the colormap to all black */ 842 } 843 844 static void hvfb_cfb_fillrect(struct fb_info *p, 845 const struct fb_fillrect *rect) 846 { 847 struct hvfb_par *par = p->par; 848 849 cfb_fillrect(p, rect); 850 if (par->synchronous_fb) 851 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 852 else 853 hvfb_ondemand_refresh_throttle(par, rect->dx, rect->dy, 854 rect->width, rect->height); 855 } 856 857 static void hvfb_cfb_copyarea(struct fb_info *p, 858 const struct fb_copyarea *area) 859 { 860 struct hvfb_par *par = p->par; 861 862 cfb_copyarea(p, area); 863 if (par->synchronous_fb) 864 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 865 else 866 hvfb_ondemand_refresh_throttle(par, area->dx, area->dy, 867 area->width, area->height); 868 } 869 870 static void hvfb_cfb_imageblit(struct fb_info *p, 871 const struct fb_image *image) 872 { 873 struct hvfb_par *par = p->par; 874 875 cfb_imageblit(p, image); 876 if (par->synchronous_fb) 877 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 878 else 879 hvfb_ondemand_refresh_throttle(par, image->dx, image->dy, 880 image->width, image->height); 881 } 882 883 static const struct fb_ops hvfb_ops = { 884 .owner = THIS_MODULE, 885 .fb_check_var = hvfb_check_var, 886 .fb_set_par = hvfb_set_par, 887 .fb_setcolreg = hvfb_setcolreg, 888 .fb_fillrect = hvfb_cfb_fillrect, 889 .fb_copyarea = hvfb_cfb_copyarea, 890 .fb_imageblit = hvfb_cfb_imageblit, 891 .fb_blank = hvfb_blank, 892 .fb_mmap = fb_deferred_io_mmap, 893 }; 894 895 896 /* Get options from kernel paramenter "video=" */ 897 static void hvfb_get_option(struct fb_info *info) 898 { 899 struct hvfb_par *par = info->par; 900 char *opt = NULL, *p; 901 uint x = 0, y = 0; 902 903 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt) 904 return; 905 906 p = strsep(&opt, "x"); 907 if (!*p || kstrtouint(p, 0, &x) || 908 !opt || !*opt || kstrtouint(opt, 0, &y)) { 909 pr_err("Screen option is invalid: skipped\n"); 910 return; 911 } 912 913 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN || 914 (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) && 915 (x * y * screen_depth / 8 > screen_fb_size)) || 916 (par->synthvid_version == SYNTHVID_VERSION_WIN8 && 917 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8)) { 918 pr_err("Screen resolution option is out of range: skipped\n"); 919 return; 920 } 921 922 screen_width = x; 923 screen_height = y; 924 return; 925 } 926 927 /* 928 * Allocate enough contiguous physical memory. 929 * Return physical address if succeeded or -1 if failed. 930 */ 931 static phys_addr_t hvfb_get_phymem(struct hv_device *hdev, 932 unsigned int request_size) 933 { 934 struct page *page = NULL; 935 dma_addr_t dma_handle; 936 void *vmem; 937 phys_addr_t paddr = 0; 938 unsigned int order = get_order(request_size); 939 940 if (request_size == 0) 941 return -1; 942 943 if (order < MAX_ORDER) { 944 /* Call alloc_pages if the size is less than 2^MAX_ORDER */ 945 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); 946 if (!page) 947 return -1; 948 949 paddr = (page_to_pfn(page) << PAGE_SHIFT); 950 } else { 951 /* Allocate from CMA */ 952 hdev->device.coherent_dma_mask = DMA_BIT_MASK(64); 953 954 vmem = dma_alloc_coherent(&hdev->device, 955 round_up(request_size, PAGE_SIZE), 956 &dma_handle, 957 GFP_KERNEL | __GFP_NOWARN); 958 959 if (!vmem) 960 return -1; 961 962 paddr = virt_to_phys(vmem); 963 } 964 965 return paddr; 966 } 967 968 /* Release contiguous physical memory */ 969 static void hvfb_release_phymem(struct hv_device *hdev, 970 phys_addr_t paddr, unsigned int size) 971 { 972 unsigned int order = get_order(size); 973 974 if (order < MAX_ORDER) 975 __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order); 976 else 977 dma_free_coherent(&hdev->device, 978 round_up(size, PAGE_SIZE), 979 phys_to_virt(paddr), 980 paddr); 981 } 982 983 984 /* Get framebuffer memory from Hyper-V video pci space */ 985 static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info) 986 { 987 struct hvfb_par *par = info->par; 988 struct pci_dev *pdev = NULL; 989 void __iomem *fb_virt; 990 int gen2vm = efi_enabled(EFI_BOOT); 991 phys_addr_t paddr; 992 int ret; 993 994 info->apertures = alloc_apertures(1); 995 if (!info->apertures) 996 return -ENOMEM; 997 998 if (!gen2vm) { 999 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT, 1000 PCI_DEVICE_ID_HYPERV_VIDEO, NULL); 1001 if (!pdev) { 1002 pr_err("Unable to find PCI Hyper-V video\n"); 1003 return -ENODEV; 1004 } 1005 1006 info->apertures->ranges[0].base = pci_resource_start(pdev, 0); 1007 info->apertures->ranges[0].size = pci_resource_len(pdev, 0); 1008 1009 /* 1010 * For Gen 1 VM, we can directly use the contiguous memory 1011 * from VM. If we succeed, deferred IO happens directly 1012 * on this allocated framebuffer memory, avoiding extra 1013 * memory copy. 1014 */ 1015 paddr = hvfb_get_phymem(hdev, screen_fb_size); 1016 if (paddr != (phys_addr_t) -1) { 1017 par->mmio_pp = paddr; 1018 par->mmio_vp = par->dio_vp = __va(paddr); 1019 1020 info->fix.smem_start = paddr; 1021 info->fix.smem_len = screen_fb_size; 1022 info->screen_base = par->mmio_vp; 1023 info->screen_size = screen_fb_size; 1024 1025 par->need_docopy = false; 1026 goto getmem_done; 1027 } 1028 pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n"); 1029 } else { 1030 info->apertures->ranges[0].base = screen_info.lfb_base; 1031 info->apertures->ranges[0].size = screen_info.lfb_size; 1032 } 1033 1034 /* 1035 * Cannot use the contiguous physical memory. 1036 * Allocate mmio space for framebuffer. 1037 */ 1038 dio_fb_size = 1039 screen_width * screen_height * screen_depth / 8; 1040 1041 ret = vmbus_allocate_mmio(&par->mem, hdev, 0, -1, 1042 screen_fb_size, 0x100000, true); 1043 if (ret != 0) { 1044 pr_err("Unable to allocate framebuffer memory\n"); 1045 goto err1; 1046 } 1047 1048 /* 1049 * Map the VRAM cacheable for performance. This is also required for 1050 * VM Connect to display properly for ARM64 Linux VM, as the host also 1051 * maps the VRAM cacheable. 1052 */ 1053 fb_virt = ioremap_cache(par->mem->start, screen_fb_size); 1054 if (!fb_virt) 1055 goto err2; 1056 1057 /* Allocate memory for deferred IO */ 1058 par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE)); 1059 if (par->dio_vp == NULL) 1060 goto err3; 1061 1062 /* Physical address of FB device */ 1063 par->mmio_pp = par->mem->start; 1064 /* Virtual address of FB device */ 1065 par->mmio_vp = (unsigned char *) fb_virt; 1066 1067 info->fix.smem_start = par->mem->start; 1068 info->fix.smem_len = dio_fb_size; 1069 info->screen_base = par->dio_vp; 1070 info->screen_size = dio_fb_size; 1071 1072 getmem_done: 1073 aperture_remove_conflicting_devices(info->apertures->ranges[0].base, 1074 info->apertures->ranges[0].size, 1075 false, KBUILD_MODNAME); 1076 1077 if (gen2vm) { 1078 /* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */ 1079 screen_info.lfb_size = 0; 1080 screen_info.lfb_base = 0; 1081 screen_info.orig_video_isVGA = 0; 1082 } else { 1083 pci_dev_put(pdev); 1084 } 1085 1086 return 0; 1087 1088 err3: 1089 iounmap(fb_virt); 1090 err2: 1091 vmbus_free_mmio(par->mem->start, screen_fb_size); 1092 par->mem = NULL; 1093 err1: 1094 if (!gen2vm) 1095 pci_dev_put(pdev); 1096 1097 return -ENOMEM; 1098 } 1099 1100 /* Release the framebuffer */ 1101 static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info) 1102 { 1103 struct hvfb_par *par = info->par; 1104 1105 if (par->need_docopy) { 1106 vfree(par->dio_vp); 1107 iounmap(info->screen_base); 1108 vmbus_free_mmio(par->mem->start, screen_fb_size); 1109 } else { 1110 hvfb_release_phymem(hdev, info->fix.smem_start, 1111 screen_fb_size); 1112 } 1113 1114 par->mem = NULL; 1115 } 1116 1117 1118 static int hvfb_probe(struct hv_device *hdev, 1119 const struct hv_vmbus_device_id *dev_id) 1120 { 1121 struct fb_info *info; 1122 struct hvfb_par *par; 1123 int ret; 1124 1125 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device); 1126 if (!info) 1127 return -ENOMEM; 1128 1129 par = info->par; 1130 par->info = info; 1131 par->fb_ready = false; 1132 par->need_docopy = true; 1133 init_completion(&par->wait); 1134 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work); 1135 1136 par->delayed_refresh = false; 1137 spin_lock_init(&par->delayed_refresh_lock); 1138 par->x1 = par->y1 = INT_MAX; 1139 par->x2 = par->y2 = 0; 1140 1141 /* Connect to VSP */ 1142 hv_set_drvdata(hdev, info); 1143 ret = synthvid_connect_vsp(hdev); 1144 if (ret) { 1145 pr_err("Unable to connect to VSP\n"); 1146 goto error1; 1147 } 1148 1149 hvfb_get_option(info); 1150 pr_info("Screen resolution: %dx%d, Color depth: %d, Frame buffer size: %d\n", 1151 screen_width, screen_height, screen_depth, screen_fb_size); 1152 1153 ret = hvfb_getmem(hdev, info); 1154 if (ret) { 1155 pr_err("No memory for framebuffer\n"); 1156 goto error2; 1157 } 1158 1159 /* Set up fb_info */ 1160 info->flags = FBINFO_DEFAULT; 1161 1162 info->var.xres_virtual = info->var.xres = screen_width; 1163 info->var.yres_virtual = info->var.yres = screen_height; 1164 info->var.bits_per_pixel = screen_depth; 1165 1166 if (info->var.bits_per_pixel == 16) { 1167 info->var.red = (struct fb_bitfield){11, 5, 0}; 1168 info->var.green = (struct fb_bitfield){5, 6, 0}; 1169 info->var.blue = (struct fb_bitfield){0, 5, 0}; 1170 info->var.transp = (struct fb_bitfield){0, 0, 0}; 1171 } else { 1172 info->var.red = (struct fb_bitfield){16, 8, 0}; 1173 info->var.green = (struct fb_bitfield){8, 8, 0}; 1174 info->var.blue = (struct fb_bitfield){0, 8, 0}; 1175 info->var.transp = (struct fb_bitfield){24, 8, 0}; 1176 } 1177 1178 info->var.activate = FB_ACTIVATE_NOW; 1179 info->var.height = -1; 1180 info->var.width = -1; 1181 info->var.vmode = FB_VMODE_NONINTERLACED; 1182 1183 strcpy(info->fix.id, KBUILD_MODNAME); 1184 info->fix.type = FB_TYPE_PACKED_PIXELS; 1185 info->fix.visual = FB_VISUAL_TRUECOLOR; 1186 info->fix.line_length = screen_width * screen_depth / 8; 1187 info->fix.accel = FB_ACCEL_NONE; 1188 1189 info->fbops = &hvfb_ops; 1190 info->pseudo_palette = par->pseudo_palette; 1191 1192 /* Initialize deferred IO */ 1193 info->fbdefio = &synthvid_defio; 1194 fb_deferred_io_init(info); 1195 1196 /* Send config to host */ 1197 ret = synthvid_send_config(hdev); 1198 if (ret) 1199 goto error; 1200 1201 ret = register_framebuffer(info); 1202 if (ret) { 1203 pr_err("Unable to register framebuffer\n"); 1204 goto error; 1205 } 1206 1207 par->fb_ready = true; 1208 1209 par->synchronous_fb = false; 1210 par->hvfb_panic_nb.notifier_call = hvfb_on_panic; 1211 atomic_notifier_chain_register(&panic_notifier_list, 1212 &par->hvfb_panic_nb); 1213 1214 return 0; 1215 1216 error: 1217 fb_deferred_io_cleanup(info); 1218 hvfb_putmem(hdev, info); 1219 error2: 1220 vmbus_close(hdev->channel); 1221 error1: 1222 cancel_delayed_work_sync(&par->dwork); 1223 hv_set_drvdata(hdev, NULL); 1224 framebuffer_release(info); 1225 return ret; 1226 } 1227 1228 1229 static int hvfb_remove(struct hv_device *hdev) 1230 { 1231 struct fb_info *info = hv_get_drvdata(hdev); 1232 struct hvfb_par *par = info->par; 1233 1234 atomic_notifier_chain_unregister(&panic_notifier_list, 1235 &par->hvfb_panic_nb); 1236 1237 par->update = false; 1238 par->fb_ready = false; 1239 1240 fb_deferred_io_cleanup(info); 1241 1242 unregister_framebuffer(info); 1243 cancel_delayed_work_sync(&par->dwork); 1244 1245 vmbus_close(hdev->channel); 1246 hv_set_drvdata(hdev, NULL); 1247 1248 hvfb_putmem(hdev, info); 1249 framebuffer_release(info); 1250 1251 return 0; 1252 } 1253 1254 static int hvfb_suspend(struct hv_device *hdev) 1255 { 1256 struct fb_info *info = hv_get_drvdata(hdev); 1257 struct hvfb_par *par = info->par; 1258 1259 console_lock(); 1260 1261 /* 1 means do suspend */ 1262 fb_set_suspend(info, 1); 1263 1264 cancel_delayed_work_sync(&par->dwork); 1265 cancel_delayed_work_sync(&info->deferred_work); 1266 1267 par->update_saved = par->update; 1268 par->update = false; 1269 par->fb_ready = false; 1270 1271 vmbus_close(hdev->channel); 1272 1273 console_unlock(); 1274 1275 return 0; 1276 } 1277 1278 static int hvfb_resume(struct hv_device *hdev) 1279 { 1280 struct fb_info *info = hv_get_drvdata(hdev); 1281 struct hvfb_par *par = info->par; 1282 int ret; 1283 1284 console_lock(); 1285 1286 ret = synthvid_connect_vsp(hdev); 1287 if (ret != 0) 1288 goto out; 1289 1290 ret = synthvid_send_config(hdev); 1291 if (ret != 0) { 1292 vmbus_close(hdev->channel); 1293 goto out; 1294 } 1295 1296 par->fb_ready = true; 1297 par->update = par->update_saved; 1298 1299 schedule_delayed_work(&info->deferred_work, info->fbdefio->delay); 1300 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 1301 1302 /* 0 means do resume */ 1303 fb_set_suspend(info, 0); 1304 1305 out: 1306 console_unlock(); 1307 1308 return ret; 1309 } 1310 1311 1312 static const struct pci_device_id pci_stub_id_table[] = { 1313 { 1314 .vendor = PCI_VENDOR_ID_MICROSOFT, 1315 .device = PCI_DEVICE_ID_HYPERV_VIDEO, 1316 }, 1317 { /* end of list */ } 1318 }; 1319 1320 static const struct hv_vmbus_device_id id_table[] = { 1321 /* Synthetic Video Device GUID */ 1322 {HV_SYNTHVID_GUID}, 1323 {} 1324 }; 1325 1326 MODULE_DEVICE_TABLE(pci, pci_stub_id_table); 1327 MODULE_DEVICE_TABLE(vmbus, id_table); 1328 1329 static struct hv_driver hvfb_drv = { 1330 .name = KBUILD_MODNAME, 1331 .id_table = id_table, 1332 .probe = hvfb_probe, 1333 .remove = hvfb_remove, 1334 .suspend = hvfb_suspend, 1335 .resume = hvfb_resume, 1336 .driver = { 1337 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1338 }, 1339 }; 1340 1341 static int hvfb_pci_stub_probe(struct pci_dev *pdev, 1342 const struct pci_device_id *ent) 1343 { 1344 return 0; 1345 } 1346 1347 static void hvfb_pci_stub_remove(struct pci_dev *pdev) 1348 { 1349 } 1350 1351 static struct pci_driver hvfb_pci_stub_driver = { 1352 .name = KBUILD_MODNAME, 1353 .id_table = pci_stub_id_table, 1354 .probe = hvfb_pci_stub_probe, 1355 .remove = hvfb_pci_stub_remove, 1356 .driver = { 1357 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1358 } 1359 }; 1360 1361 static int __init hvfb_drv_init(void) 1362 { 1363 int ret; 1364 1365 if (fb_modesetting_disabled("hyper_fb")) 1366 return -ENODEV; 1367 1368 ret = vmbus_driver_register(&hvfb_drv); 1369 if (ret != 0) 1370 return ret; 1371 1372 ret = pci_register_driver(&hvfb_pci_stub_driver); 1373 if (ret != 0) { 1374 vmbus_driver_unregister(&hvfb_drv); 1375 return ret; 1376 } 1377 1378 return 0; 1379 } 1380 1381 static void __exit hvfb_drv_exit(void) 1382 { 1383 pci_unregister_driver(&hvfb_pci_stub_driver); 1384 vmbus_driver_unregister(&hvfb_drv); 1385 } 1386 1387 module_init(hvfb_drv_init); 1388 module_exit(hvfb_drv_exit); 1389 1390 MODULE_LICENSE("GPL"); 1391 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver"); 1392