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 63 /* Hyper-V Synthetic Video Protocol definitions and structures */ 64 #define MAX_VMBUS_PKT_SIZE 0x4000 65 66 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major)) 67 /* Support for VERSION_WIN7 is removed. #define is retained for reference. */ 68 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0) 69 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2) 70 #define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5) 71 72 #define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff) 73 #define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16) 74 75 #define SYNTHVID_DEPTH_WIN8 32 76 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024) 77 78 #define PCI_VENDOR_ID_MICROSOFT 0x1414 79 #define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353 80 81 82 enum pipe_msg_type { 83 PIPE_MSG_INVALID, 84 PIPE_MSG_DATA, 85 PIPE_MSG_MAX 86 }; 87 88 struct pipe_msg_hdr { 89 u32 type; 90 u32 size; /* size of message after this field */ 91 } __packed; 92 93 94 enum synthvid_msg_type { 95 SYNTHVID_ERROR = 0, 96 SYNTHVID_VERSION_REQUEST = 1, 97 SYNTHVID_VERSION_RESPONSE = 2, 98 SYNTHVID_VRAM_LOCATION = 3, 99 SYNTHVID_VRAM_LOCATION_ACK = 4, 100 SYNTHVID_SITUATION_UPDATE = 5, 101 SYNTHVID_SITUATION_UPDATE_ACK = 6, 102 SYNTHVID_POINTER_POSITION = 7, 103 SYNTHVID_POINTER_SHAPE = 8, 104 SYNTHVID_FEATURE_CHANGE = 9, 105 SYNTHVID_DIRT = 10, 106 SYNTHVID_RESOLUTION_REQUEST = 13, 107 SYNTHVID_RESOLUTION_RESPONSE = 14, 108 109 SYNTHVID_MAX = 15 110 }; 111 112 #define SYNTHVID_EDID_BLOCK_SIZE 128 113 #define SYNTHVID_MAX_RESOLUTION_COUNT 64 114 115 struct hvd_screen_info { 116 u16 width; 117 u16 height; 118 } __packed; 119 120 struct synthvid_msg_hdr { 121 u32 type; 122 u32 size; /* size of this header + payload after this field*/ 123 } __packed; 124 125 struct synthvid_version_req { 126 u32 version; 127 } __packed; 128 129 struct synthvid_version_resp { 130 u32 version; 131 u8 is_accepted; 132 u8 max_video_outputs; 133 } __packed; 134 135 struct synthvid_supported_resolution_req { 136 u8 maximum_resolution_count; 137 } __packed; 138 139 struct synthvid_supported_resolution_resp { 140 u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE]; 141 u8 resolution_count; 142 u8 default_resolution_index; 143 u8 is_standard; 144 struct hvd_screen_info 145 supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT]; 146 } __packed; 147 148 struct synthvid_vram_location { 149 u64 user_ctx; 150 u8 is_vram_gpa_specified; 151 u64 vram_gpa; 152 } __packed; 153 154 struct synthvid_vram_location_ack { 155 u64 user_ctx; 156 } __packed; 157 158 struct video_output_situation { 159 u8 active; 160 u32 vram_offset; 161 u8 depth_bits; 162 u32 width_pixels; 163 u32 height_pixels; 164 u32 pitch_bytes; 165 } __packed; 166 167 struct synthvid_situation_update { 168 u64 user_ctx; 169 u8 video_output_count; 170 struct video_output_situation video_output[1]; 171 } __packed; 172 173 struct synthvid_situation_update_ack { 174 u64 user_ctx; 175 } __packed; 176 177 struct synthvid_pointer_position { 178 u8 is_visible; 179 u8 video_output; 180 s32 image_x; 181 s32 image_y; 182 } __packed; 183 184 185 #define CURSOR_MAX_X 96 186 #define CURSOR_MAX_Y 96 187 #define CURSOR_ARGB_PIXEL_SIZE 4 188 #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE) 189 #define CURSOR_COMPLETE (-1) 190 191 struct synthvid_pointer_shape { 192 u8 part_idx; 193 u8 is_argb; 194 u32 width; /* CURSOR_MAX_X at most */ 195 u32 height; /* CURSOR_MAX_Y at most */ 196 u32 hot_x; /* hotspot relative to upper-left of pointer image */ 197 u32 hot_y; 198 u8 data[4]; 199 } __packed; 200 201 struct synthvid_feature_change { 202 u8 is_dirt_needed; 203 u8 is_ptr_pos_needed; 204 u8 is_ptr_shape_needed; 205 u8 is_situ_needed; 206 } __packed; 207 208 struct rect { 209 s32 x1, y1; /* top left corner */ 210 s32 x2, y2; /* bottom right corner, exclusive */ 211 } __packed; 212 213 struct synthvid_dirt { 214 u8 video_output; 215 u8 dirt_count; 216 struct rect rect[1]; 217 } __packed; 218 219 struct synthvid_msg { 220 struct pipe_msg_hdr pipe_hdr; 221 struct synthvid_msg_hdr vid_hdr; 222 union { 223 struct synthvid_version_req ver_req; 224 struct synthvid_version_resp ver_resp; 225 struct synthvid_vram_location vram; 226 struct synthvid_vram_location_ack vram_ack; 227 struct synthvid_situation_update situ; 228 struct synthvid_situation_update_ack situ_ack; 229 struct synthvid_pointer_position ptr_pos; 230 struct synthvid_pointer_shape ptr_shape; 231 struct synthvid_feature_change feature_chg; 232 struct synthvid_dirt dirt; 233 struct synthvid_supported_resolution_req resolution_req; 234 struct synthvid_supported_resolution_resp resolution_resp; 235 }; 236 } __packed; 237 238 239 /* FB driver definitions and structures */ 240 #define HVFB_WIDTH 1152 /* default screen width */ 241 #define HVFB_HEIGHT 864 /* default screen height */ 242 #define HVFB_WIDTH_MIN 640 243 #define HVFB_HEIGHT_MIN 480 244 245 #define RING_BUFSIZE (256 * 1024) 246 #define VSP_TIMEOUT (10 * HZ) 247 #define HVFB_UPDATE_DELAY (HZ / 20) 248 #define HVFB_ONDEMAND_THROTTLE (HZ / 20) 249 250 struct hvfb_par { 251 struct fb_info *info; 252 struct resource *mem; 253 bool fb_ready; /* fb device is ready */ 254 struct completion wait; 255 u32 synthvid_version; 256 257 struct delayed_work dwork; 258 bool update; 259 bool update_saved; /* The value of 'update' before hibernation */ 260 261 u32 pseudo_palette[16]; 262 u8 init_buf[MAX_VMBUS_PKT_SIZE]; 263 u8 recv_buf[MAX_VMBUS_PKT_SIZE]; 264 265 /* If true, the VSC notifies the VSP on every framebuffer change */ 266 bool synchronous_fb; 267 268 /* If true, need to copy from deferred IO mem to framebuffer mem */ 269 bool need_docopy; 270 271 struct notifier_block hvfb_panic_nb; 272 273 /* Memory for deferred IO and frame buffer itself */ 274 unsigned char *dio_vp; 275 unsigned char *mmio_vp; 276 phys_addr_t mmio_pp; 277 278 /* Dirty rectangle, protected by delayed_refresh_lock */ 279 int x1, y1, x2, y2; 280 bool delayed_refresh; 281 spinlock_t delayed_refresh_lock; 282 }; 283 284 static uint screen_width = HVFB_WIDTH; 285 static uint screen_height = HVFB_HEIGHT; 286 static uint screen_depth; 287 static uint screen_fb_size; 288 static uint dio_fb_size; /* FB size for deferred IO */ 289 290 /* Send message to Hyper-V host */ 291 static inline int synthvid_send(struct hv_device *hdev, 292 struct synthvid_msg *msg) 293 { 294 static atomic64_t request_id = ATOMIC64_INIT(0); 295 int ret; 296 297 msg->pipe_hdr.type = PIPE_MSG_DATA; 298 msg->pipe_hdr.size = msg->vid_hdr.size; 299 300 ret = vmbus_sendpacket(hdev->channel, msg, 301 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr), 302 atomic64_inc_return(&request_id), 303 VM_PKT_DATA_INBAND, 0); 304 305 if (ret) 306 pr_err_ratelimited("Unable to send packet via vmbus; error %d\n", ret); 307 308 return ret; 309 } 310 311 312 /* Send screen resolution info to host */ 313 static int synthvid_send_situ(struct hv_device *hdev) 314 { 315 struct fb_info *info = hv_get_drvdata(hdev); 316 struct synthvid_msg msg; 317 318 if (!info) 319 return -ENODEV; 320 321 memset(&msg, 0, sizeof(struct synthvid_msg)); 322 323 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE; 324 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 325 sizeof(struct synthvid_situation_update); 326 msg.situ.user_ctx = 0; 327 msg.situ.video_output_count = 1; 328 msg.situ.video_output[0].active = 1; 329 msg.situ.video_output[0].vram_offset = 0; 330 msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel; 331 msg.situ.video_output[0].width_pixels = info->var.xres; 332 msg.situ.video_output[0].height_pixels = info->var.yres; 333 msg.situ.video_output[0].pitch_bytes = info->fix.line_length; 334 335 synthvid_send(hdev, &msg); 336 337 return 0; 338 } 339 340 /* Send mouse pointer info to host */ 341 static int synthvid_send_ptr(struct hv_device *hdev) 342 { 343 struct synthvid_msg msg; 344 345 memset(&msg, 0, sizeof(struct synthvid_msg)); 346 msg.vid_hdr.type = SYNTHVID_POINTER_POSITION; 347 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 348 sizeof(struct synthvid_pointer_position); 349 msg.ptr_pos.is_visible = 1; 350 msg.ptr_pos.video_output = 0; 351 msg.ptr_pos.image_x = 0; 352 msg.ptr_pos.image_y = 0; 353 synthvid_send(hdev, &msg); 354 355 memset(&msg, 0, sizeof(struct synthvid_msg)); 356 msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE; 357 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 358 sizeof(struct synthvid_pointer_shape); 359 msg.ptr_shape.part_idx = CURSOR_COMPLETE; 360 msg.ptr_shape.is_argb = 1; 361 msg.ptr_shape.width = 1; 362 msg.ptr_shape.height = 1; 363 msg.ptr_shape.hot_x = 0; 364 msg.ptr_shape.hot_y = 0; 365 msg.ptr_shape.data[0] = 0; 366 msg.ptr_shape.data[1] = 1; 367 msg.ptr_shape.data[2] = 1; 368 msg.ptr_shape.data[3] = 1; 369 synthvid_send(hdev, &msg); 370 371 return 0; 372 } 373 374 /* Send updated screen area (dirty rectangle) location to host */ 375 static int 376 synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2) 377 { 378 struct hv_device *hdev = device_to_hv_device(info->device); 379 struct synthvid_msg msg; 380 381 memset(&msg, 0, sizeof(struct synthvid_msg)); 382 if (x2 == INT_MAX) 383 x2 = info->var.xres; 384 if (y2 == INT_MAX) 385 y2 = info->var.yres; 386 387 msg.vid_hdr.type = SYNTHVID_DIRT; 388 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 389 sizeof(struct synthvid_dirt); 390 msg.dirt.video_output = 0; 391 msg.dirt.dirt_count = 1; 392 msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1; 393 msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1; 394 msg.dirt.rect[0].x2 = 395 (x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2; 396 msg.dirt.rect[0].y2 = 397 (y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2; 398 399 synthvid_send(hdev, &msg); 400 401 return 0; 402 } 403 404 static void hvfb_docopy(struct hvfb_par *par, 405 unsigned long offset, 406 unsigned long size) 407 { 408 if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready || 409 size == 0 || offset >= dio_fb_size) 410 return; 411 412 if (offset + size > dio_fb_size) 413 size = dio_fb_size - offset; 414 415 memcpy(par->mmio_vp + offset, par->dio_vp + offset, size); 416 } 417 418 /* Deferred IO callback */ 419 static void synthvid_deferred_io(struct fb_info *p, struct list_head *pagereflist) 420 { 421 struct hvfb_par *par = p->par; 422 struct fb_deferred_io_pageref *pageref; 423 unsigned long start, end; 424 int y1, y2, miny, maxy; 425 426 miny = INT_MAX; 427 maxy = 0; 428 429 /* 430 * Merge dirty pages. It is possible that last page cross 431 * over the end of frame buffer row yres. This is taken care of 432 * in synthvid_update function by clamping the y2 433 * value to yres. 434 */ 435 list_for_each_entry(pageref, pagereflist, list) { 436 start = pageref->offset; 437 end = start + PAGE_SIZE - 1; 438 y1 = start / p->fix.line_length; 439 y2 = end / p->fix.line_length; 440 miny = min_t(int, miny, y1); 441 maxy = max_t(int, maxy, y2); 442 443 /* Copy from dio space to mmio address */ 444 if (par->fb_ready && par->need_docopy) 445 hvfb_docopy(par, start, PAGE_SIZE); 446 } 447 448 if (par->fb_ready && par->update) 449 synthvid_update(p, 0, miny, p->var.xres, maxy + 1); 450 } 451 452 static struct fb_deferred_io synthvid_defio = { 453 .delay = HZ / 20, 454 .deferred_io = synthvid_deferred_io, 455 }; 456 457 /* 458 * Actions on received messages from host: 459 * Complete the wait event. 460 * Or, reply with screen and cursor info. 461 */ 462 static void synthvid_recv_sub(struct hv_device *hdev) 463 { 464 struct fb_info *info = hv_get_drvdata(hdev); 465 struct hvfb_par *par; 466 struct synthvid_msg *msg; 467 468 if (!info) 469 return; 470 471 par = info->par; 472 msg = (struct synthvid_msg *)par->recv_buf; 473 474 /* Complete the wait event */ 475 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE || 476 msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE || 477 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) { 478 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE); 479 complete(&par->wait); 480 return; 481 } 482 483 /* Reply with screen and cursor info */ 484 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) { 485 if (par->fb_ready) { 486 synthvid_send_ptr(hdev); 487 synthvid_send_situ(hdev); 488 } 489 490 par->update = msg->feature_chg.is_dirt_needed; 491 if (par->update) 492 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 493 } 494 } 495 496 /* Receive callback for messages from the host */ 497 static void synthvid_receive(void *ctx) 498 { 499 struct hv_device *hdev = ctx; 500 struct fb_info *info = hv_get_drvdata(hdev); 501 struct hvfb_par *par; 502 struct synthvid_msg *recv_buf; 503 u32 bytes_recvd; 504 u64 req_id; 505 int ret; 506 507 if (!info) 508 return; 509 510 par = info->par; 511 recv_buf = (struct synthvid_msg *)par->recv_buf; 512 513 do { 514 ret = vmbus_recvpacket(hdev->channel, recv_buf, 515 MAX_VMBUS_PKT_SIZE, 516 &bytes_recvd, &req_id); 517 if (bytes_recvd > 0 && 518 recv_buf->pipe_hdr.type == PIPE_MSG_DATA) 519 synthvid_recv_sub(hdev); 520 } while (bytes_recvd > 0 && ret == 0); 521 } 522 523 /* Check if the ver1 version is equal or greater than ver2 */ 524 static inline bool synthvid_ver_ge(u32 ver1, u32 ver2) 525 { 526 if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) || 527 (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) && 528 SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2))) 529 return true; 530 531 return false; 532 } 533 534 /* Check synthetic video protocol version with the host */ 535 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver) 536 { 537 struct fb_info *info = hv_get_drvdata(hdev); 538 struct hvfb_par *par = info->par; 539 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 540 int ret = 0; 541 unsigned long t; 542 543 memset(msg, 0, sizeof(struct synthvid_msg)); 544 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST; 545 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 546 sizeof(struct synthvid_version_req); 547 msg->ver_req.version = ver; 548 synthvid_send(hdev, msg); 549 550 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 551 if (!t) { 552 pr_err("Time out on waiting version response\n"); 553 ret = -ETIMEDOUT; 554 goto out; 555 } 556 if (!msg->ver_resp.is_accepted) { 557 ret = -ENODEV; 558 goto out; 559 } 560 561 par->synthvid_version = ver; 562 pr_info("Synthvid Version major %d, minor %d\n", 563 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver)); 564 565 out: 566 return ret; 567 } 568 569 /* Get current resolution from the host */ 570 static int synthvid_get_supported_resolution(struct hv_device *hdev) 571 { 572 struct fb_info *info = hv_get_drvdata(hdev); 573 struct hvfb_par *par = info->par; 574 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 575 int ret = 0; 576 unsigned long t; 577 u8 index; 578 579 memset(msg, 0, sizeof(struct synthvid_msg)); 580 msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST; 581 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 582 sizeof(struct synthvid_supported_resolution_req); 583 584 msg->resolution_req.maximum_resolution_count = 585 SYNTHVID_MAX_RESOLUTION_COUNT; 586 synthvid_send(hdev, msg); 587 588 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 589 if (!t) { 590 pr_err("Time out on waiting resolution response\n"); 591 ret = -ETIMEDOUT; 592 goto out; 593 } 594 595 if (msg->resolution_resp.resolution_count == 0) { 596 pr_err("No supported resolutions\n"); 597 ret = -ENODEV; 598 goto out; 599 } 600 601 index = msg->resolution_resp.default_resolution_index; 602 if (index >= msg->resolution_resp.resolution_count) { 603 pr_err("Invalid resolution index: %d\n", index); 604 ret = -ENODEV; 605 goto out; 606 } 607 608 screen_width = 609 msg->resolution_resp.supported_resolution[index].width; 610 screen_height = 611 msg->resolution_resp.supported_resolution[index].height; 612 613 out: 614 return ret; 615 } 616 617 /* Connect to VSP (Virtual Service Provider) on host */ 618 static int synthvid_connect_vsp(struct hv_device *hdev) 619 { 620 struct fb_info *info = hv_get_drvdata(hdev); 621 struct hvfb_par *par = info->par; 622 int ret; 623 624 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE, 625 NULL, 0, synthvid_receive, hdev); 626 if (ret) { 627 pr_err("Unable to open vmbus channel\n"); 628 return ret; 629 } 630 631 /* Negotiate the protocol version with host */ 632 switch (vmbus_proto_version) { 633 case VERSION_WIN10: 634 case VERSION_WIN10_V5: 635 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 636 if (!ret) 637 break; 638 fallthrough; 639 case VERSION_WIN8: 640 case VERSION_WIN8_1: 641 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8); 642 break; 643 default: 644 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 645 break; 646 } 647 648 if (ret) { 649 pr_err("Synthetic video device version not accepted\n"); 650 goto error; 651 } 652 653 screen_depth = SYNTHVID_DEPTH_WIN8; 654 if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) { 655 ret = synthvid_get_supported_resolution(hdev); 656 if (ret) 657 pr_info("Failed to get supported resolution from host, use default\n"); 658 } 659 660 screen_fb_size = hdev->channel->offermsg.offer. 661 mmio_megabytes * 1024 * 1024; 662 663 return 0; 664 665 error: 666 vmbus_close(hdev->channel); 667 return ret; 668 } 669 670 /* Send VRAM and Situation messages to the host */ 671 static int synthvid_send_config(struct hv_device *hdev) 672 { 673 struct fb_info *info = hv_get_drvdata(hdev); 674 struct hvfb_par *par = info->par; 675 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 676 int ret = 0; 677 unsigned long t; 678 679 /* Send VRAM location */ 680 memset(msg, 0, sizeof(struct synthvid_msg)); 681 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION; 682 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 683 sizeof(struct synthvid_vram_location); 684 msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp; 685 msg->vram.is_vram_gpa_specified = 1; 686 synthvid_send(hdev, msg); 687 688 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 689 if (!t) { 690 pr_err("Time out on waiting vram location ack\n"); 691 ret = -ETIMEDOUT; 692 goto out; 693 } 694 if (msg->vram_ack.user_ctx != par->mmio_pp) { 695 pr_err("Unable to set VRAM location\n"); 696 ret = -ENODEV; 697 goto out; 698 } 699 700 /* Send pointer and situation update */ 701 synthvid_send_ptr(hdev); 702 synthvid_send_situ(hdev); 703 704 out: 705 return ret; 706 } 707 708 709 /* 710 * Delayed work callback: 711 * It is scheduled to call whenever update request is received and it has 712 * not been called in last HVFB_ONDEMAND_THROTTLE time interval. 713 */ 714 static void hvfb_update_work(struct work_struct *w) 715 { 716 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work); 717 struct fb_info *info = par->info; 718 unsigned long flags; 719 int x1, x2, y1, y2; 720 int j; 721 722 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 723 /* Reset the request flag */ 724 par->delayed_refresh = false; 725 726 /* Store the dirty rectangle to local variables */ 727 x1 = par->x1; 728 x2 = par->x2; 729 y1 = par->y1; 730 y2 = par->y2; 731 732 /* Clear dirty rectangle */ 733 par->x1 = par->y1 = INT_MAX; 734 par->x2 = par->y2 = 0; 735 736 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 737 738 if (x1 > info->var.xres || x2 > info->var.xres || 739 y1 > info->var.yres || y2 > info->var.yres || x2 <= x1) 740 return; 741 742 /* Copy the dirty rectangle to frame buffer memory */ 743 if (par->need_docopy) 744 for (j = y1; j < y2; j++) 745 hvfb_docopy(par, 746 j * info->fix.line_length + 747 (x1 * screen_depth / 8), 748 (x2 - x1) * screen_depth / 8); 749 750 /* Refresh */ 751 if (par->fb_ready && par->update) 752 synthvid_update(info, x1, y1, x2, y2); 753 } 754 755 /* 756 * Control the on-demand refresh frequency. It schedules a delayed 757 * screen update if it has not yet. 758 */ 759 static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par, 760 int x1, int y1, int w, int h) 761 { 762 unsigned long flags; 763 int x2 = x1 + w; 764 int y2 = y1 + h; 765 766 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 767 768 /* Merge dirty rectangle */ 769 par->x1 = min_t(int, par->x1, x1); 770 par->y1 = min_t(int, par->y1, y1); 771 par->x2 = max_t(int, par->x2, x2); 772 par->y2 = max_t(int, par->y2, y2); 773 774 /* Schedule a delayed screen update if not yet */ 775 if (par->delayed_refresh == false) { 776 schedule_delayed_work(&par->dwork, 777 HVFB_ONDEMAND_THROTTLE); 778 par->delayed_refresh = true; 779 } 780 781 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 782 } 783 784 static int hvfb_on_panic(struct notifier_block *nb, 785 unsigned long e, void *p) 786 { 787 struct hvfb_par *par; 788 struct fb_info *info; 789 790 par = container_of(nb, struct hvfb_par, hvfb_panic_nb); 791 par->synchronous_fb = true; 792 info = par->info; 793 if (par->need_docopy) 794 hvfb_docopy(par, 0, dio_fb_size); 795 synthvid_update(info, 0, 0, INT_MAX, INT_MAX); 796 797 return NOTIFY_DONE; 798 } 799 800 /* Framebuffer operation handlers */ 801 802 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 803 { 804 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN || 805 var->xres > screen_width || var->yres > screen_height || 806 var->bits_per_pixel != screen_depth) 807 return -EINVAL; 808 809 var->xres_virtual = var->xres; 810 var->yres_virtual = var->yres; 811 812 return 0; 813 } 814 815 static int hvfb_set_par(struct fb_info *info) 816 { 817 struct hv_device *hdev = device_to_hv_device(info->device); 818 819 return synthvid_send_situ(hdev); 820 } 821 822 823 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf) 824 { 825 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; 826 } 827 828 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green, 829 unsigned blue, unsigned transp, struct fb_info *info) 830 { 831 u32 *pal = info->pseudo_palette; 832 833 if (regno > 15) 834 return -EINVAL; 835 836 pal[regno] = chan_to_field(red, &info->var.red) 837 | chan_to_field(green, &info->var.green) 838 | chan_to_field(blue, &info->var.blue) 839 | chan_to_field(transp, &info->var.transp); 840 841 return 0; 842 } 843 844 static int hvfb_blank(int blank, struct fb_info *info) 845 { 846 return 1; /* get fb_blank to set the colormap to all black */ 847 } 848 849 static void hvfb_cfb_fillrect(struct fb_info *p, 850 const struct fb_fillrect *rect) 851 { 852 struct hvfb_par *par = p->par; 853 854 cfb_fillrect(p, rect); 855 if (par->synchronous_fb) 856 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 857 else 858 hvfb_ondemand_refresh_throttle(par, rect->dx, rect->dy, 859 rect->width, rect->height); 860 } 861 862 static void hvfb_cfb_copyarea(struct fb_info *p, 863 const struct fb_copyarea *area) 864 { 865 struct hvfb_par *par = p->par; 866 867 cfb_copyarea(p, area); 868 if (par->synchronous_fb) 869 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 870 else 871 hvfb_ondemand_refresh_throttle(par, area->dx, area->dy, 872 area->width, area->height); 873 } 874 875 static void hvfb_cfb_imageblit(struct fb_info *p, 876 const struct fb_image *image) 877 { 878 struct hvfb_par *par = p->par; 879 880 cfb_imageblit(p, image); 881 if (par->synchronous_fb) 882 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 883 else 884 hvfb_ondemand_refresh_throttle(par, image->dx, image->dy, 885 image->width, image->height); 886 } 887 888 static const struct fb_ops hvfb_ops = { 889 .owner = THIS_MODULE, 890 .fb_check_var = hvfb_check_var, 891 .fb_set_par = hvfb_set_par, 892 .fb_setcolreg = hvfb_setcolreg, 893 .fb_fillrect = hvfb_cfb_fillrect, 894 .fb_copyarea = hvfb_cfb_copyarea, 895 .fb_imageblit = hvfb_cfb_imageblit, 896 .fb_blank = hvfb_blank, 897 .fb_mmap = fb_deferred_io_mmap, 898 }; 899 900 901 /* Get options from kernel paramenter "video=" */ 902 static void hvfb_get_option(struct fb_info *info) 903 { 904 struct hvfb_par *par = info->par; 905 char *opt = NULL, *p; 906 uint x = 0, y = 0; 907 908 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt) 909 return; 910 911 p = strsep(&opt, "x"); 912 if (!*p || kstrtouint(p, 0, &x) || 913 !opt || !*opt || kstrtouint(opt, 0, &y)) { 914 pr_err("Screen option is invalid: skipped\n"); 915 return; 916 } 917 918 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN || 919 (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) && 920 (x * y * screen_depth / 8 > screen_fb_size)) || 921 (par->synthvid_version == SYNTHVID_VERSION_WIN8 && 922 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8)) { 923 pr_err("Screen resolution option is out of range: skipped\n"); 924 return; 925 } 926 927 screen_width = x; 928 screen_height = y; 929 return; 930 } 931 932 /* 933 * Allocate enough contiguous physical memory. 934 * Return physical address if succeeded or -1 if failed. 935 */ 936 static phys_addr_t hvfb_get_phymem(struct hv_device *hdev, 937 unsigned int request_size) 938 { 939 struct page *page = NULL; 940 dma_addr_t dma_handle; 941 void *vmem; 942 phys_addr_t paddr = 0; 943 unsigned int order = get_order(request_size); 944 945 if (request_size == 0) 946 return -1; 947 948 if (order < MAX_ORDER) { 949 /* Call alloc_pages if the size is less than 2^MAX_ORDER */ 950 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); 951 if (!page) 952 return -1; 953 954 paddr = (page_to_pfn(page) << PAGE_SHIFT); 955 } else { 956 /* Allocate from CMA */ 957 hdev->device.coherent_dma_mask = DMA_BIT_MASK(64); 958 959 vmem = dma_alloc_coherent(&hdev->device, 960 round_up(request_size, PAGE_SIZE), 961 &dma_handle, 962 GFP_KERNEL | __GFP_NOWARN); 963 964 if (!vmem) 965 return -1; 966 967 paddr = virt_to_phys(vmem); 968 } 969 970 return paddr; 971 } 972 973 /* Release contiguous physical memory */ 974 static void hvfb_release_phymem(struct hv_device *hdev, 975 phys_addr_t paddr, unsigned int size) 976 { 977 unsigned int order = get_order(size); 978 979 if (order < MAX_ORDER) 980 __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order); 981 else 982 dma_free_coherent(&hdev->device, 983 round_up(size, PAGE_SIZE), 984 phys_to_virt(paddr), 985 paddr); 986 } 987 988 989 /* Get framebuffer memory from Hyper-V video pci space */ 990 static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info) 991 { 992 struct hvfb_par *par = info->par; 993 struct pci_dev *pdev = NULL; 994 void __iomem *fb_virt; 995 int gen2vm = efi_enabled(EFI_BOOT); 996 phys_addr_t paddr; 997 int ret; 998 999 info->apertures = alloc_apertures(1); 1000 if (!info->apertures) 1001 return -ENOMEM; 1002 1003 if (!gen2vm) { 1004 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT, 1005 PCI_DEVICE_ID_HYPERV_VIDEO, NULL); 1006 if (!pdev) { 1007 pr_err("Unable to find PCI Hyper-V video\n"); 1008 return -ENODEV; 1009 } 1010 1011 info->apertures->ranges[0].base = pci_resource_start(pdev, 0); 1012 info->apertures->ranges[0].size = pci_resource_len(pdev, 0); 1013 1014 /* 1015 * For Gen 1 VM, we can directly use the contiguous memory 1016 * from VM. If we succeed, deferred IO happens directly 1017 * on this allocated framebuffer memory, avoiding extra 1018 * memory copy. 1019 */ 1020 paddr = hvfb_get_phymem(hdev, screen_fb_size); 1021 if (paddr != (phys_addr_t) -1) { 1022 par->mmio_pp = paddr; 1023 par->mmio_vp = par->dio_vp = __va(paddr); 1024 1025 info->fix.smem_start = paddr; 1026 info->fix.smem_len = screen_fb_size; 1027 info->screen_base = par->mmio_vp; 1028 info->screen_size = screen_fb_size; 1029 1030 par->need_docopy = false; 1031 goto getmem_done; 1032 } 1033 pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n"); 1034 } else { 1035 info->apertures->ranges[0].base = screen_info.lfb_base; 1036 info->apertures->ranges[0].size = screen_info.lfb_size; 1037 } 1038 1039 /* 1040 * Cannot use the contiguous physical memory. 1041 * Allocate mmio space for framebuffer. 1042 */ 1043 dio_fb_size = 1044 screen_width * screen_height * screen_depth / 8; 1045 1046 ret = vmbus_allocate_mmio(&par->mem, hdev, 0, -1, 1047 screen_fb_size, 0x100000, true); 1048 if (ret != 0) { 1049 pr_err("Unable to allocate framebuffer memory\n"); 1050 goto err1; 1051 } 1052 1053 /* 1054 * Map the VRAM cacheable for performance. This is also required for 1055 * VM Connect to display properly for ARM64 Linux VM, as the host also 1056 * maps the VRAM cacheable. 1057 */ 1058 fb_virt = ioremap_cache(par->mem->start, screen_fb_size); 1059 if (!fb_virt) 1060 goto err2; 1061 1062 /* Allocate memory for deferred IO */ 1063 par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE)); 1064 if (par->dio_vp == NULL) 1065 goto err3; 1066 1067 /* Physical address of FB device */ 1068 par->mmio_pp = par->mem->start; 1069 /* Virtual address of FB device */ 1070 par->mmio_vp = (unsigned char *) fb_virt; 1071 1072 info->fix.smem_start = par->mem->start; 1073 info->fix.smem_len = dio_fb_size; 1074 info->screen_base = par->dio_vp; 1075 info->screen_size = dio_fb_size; 1076 1077 getmem_done: 1078 aperture_remove_conflicting_devices(info->apertures->ranges[0].base, 1079 info->apertures->ranges[0].size, 1080 false, KBUILD_MODNAME); 1081 1082 if (gen2vm) { 1083 /* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */ 1084 screen_info.lfb_size = 0; 1085 screen_info.lfb_base = 0; 1086 screen_info.orig_video_isVGA = 0; 1087 } else { 1088 pci_dev_put(pdev); 1089 } 1090 1091 return 0; 1092 1093 err3: 1094 iounmap(fb_virt); 1095 err2: 1096 vmbus_free_mmio(par->mem->start, screen_fb_size); 1097 par->mem = NULL; 1098 err1: 1099 if (!gen2vm) 1100 pci_dev_put(pdev); 1101 1102 return -ENOMEM; 1103 } 1104 1105 /* Release the framebuffer */ 1106 static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info) 1107 { 1108 struct hvfb_par *par = info->par; 1109 1110 if (par->need_docopy) { 1111 vfree(par->dio_vp); 1112 iounmap(info->screen_base); 1113 vmbus_free_mmio(par->mem->start, screen_fb_size); 1114 } else { 1115 hvfb_release_phymem(hdev, info->fix.smem_start, 1116 screen_fb_size); 1117 } 1118 1119 par->mem = NULL; 1120 } 1121 1122 1123 static int hvfb_probe(struct hv_device *hdev, 1124 const struct hv_vmbus_device_id *dev_id) 1125 { 1126 struct fb_info *info; 1127 struct hvfb_par *par; 1128 int ret; 1129 1130 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device); 1131 if (!info) 1132 return -ENOMEM; 1133 1134 par = info->par; 1135 par->info = info; 1136 par->fb_ready = false; 1137 par->need_docopy = true; 1138 init_completion(&par->wait); 1139 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work); 1140 1141 par->delayed_refresh = false; 1142 spin_lock_init(&par->delayed_refresh_lock); 1143 par->x1 = par->y1 = INT_MAX; 1144 par->x2 = par->y2 = 0; 1145 1146 /* Connect to VSP */ 1147 hv_set_drvdata(hdev, info); 1148 ret = synthvid_connect_vsp(hdev); 1149 if (ret) { 1150 pr_err("Unable to connect to VSP\n"); 1151 goto error1; 1152 } 1153 1154 hvfb_get_option(info); 1155 pr_info("Screen resolution: %dx%d, Color depth: %d, Frame buffer size: %d\n", 1156 screen_width, screen_height, screen_depth, screen_fb_size); 1157 1158 ret = hvfb_getmem(hdev, info); 1159 if (ret) { 1160 pr_err("No memory for framebuffer\n"); 1161 goto error2; 1162 } 1163 1164 /* Set up fb_info */ 1165 info->flags = FBINFO_DEFAULT; 1166 1167 info->var.xres_virtual = info->var.xres = screen_width; 1168 info->var.yres_virtual = info->var.yres = screen_height; 1169 info->var.bits_per_pixel = screen_depth; 1170 1171 if (info->var.bits_per_pixel == 16) { 1172 info->var.red = (struct fb_bitfield){11, 5, 0}; 1173 info->var.green = (struct fb_bitfield){5, 6, 0}; 1174 info->var.blue = (struct fb_bitfield){0, 5, 0}; 1175 info->var.transp = (struct fb_bitfield){0, 0, 0}; 1176 } else { 1177 info->var.red = (struct fb_bitfield){16, 8, 0}; 1178 info->var.green = (struct fb_bitfield){8, 8, 0}; 1179 info->var.blue = (struct fb_bitfield){0, 8, 0}; 1180 info->var.transp = (struct fb_bitfield){24, 8, 0}; 1181 } 1182 1183 info->var.activate = FB_ACTIVATE_NOW; 1184 info->var.height = -1; 1185 info->var.width = -1; 1186 info->var.vmode = FB_VMODE_NONINTERLACED; 1187 1188 strcpy(info->fix.id, KBUILD_MODNAME); 1189 info->fix.type = FB_TYPE_PACKED_PIXELS; 1190 info->fix.visual = FB_VISUAL_TRUECOLOR; 1191 info->fix.line_length = screen_width * screen_depth / 8; 1192 info->fix.accel = FB_ACCEL_NONE; 1193 1194 info->fbops = &hvfb_ops; 1195 info->pseudo_palette = par->pseudo_palette; 1196 1197 /* Initialize deferred IO */ 1198 info->fbdefio = &synthvid_defio; 1199 fb_deferred_io_init(info); 1200 1201 /* Send config to host */ 1202 ret = synthvid_send_config(hdev); 1203 if (ret) 1204 goto error; 1205 1206 ret = register_framebuffer(info); 1207 if (ret) { 1208 pr_err("Unable to register framebuffer\n"); 1209 goto error; 1210 } 1211 1212 par->fb_ready = true; 1213 1214 par->synchronous_fb = false; 1215 par->hvfb_panic_nb.notifier_call = hvfb_on_panic; 1216 atomic_notifier_chain_register(&panic_notifier_list, 1217 &par->hvfb_panic_nb); 1218 1219 return 0; 1220 1221 error: 1222 fb_deferred_io_cleanup(info); 1223 hvfb_putmem(hdev, info); 1224 error2: 1225 vmbus_close(hdev->channel); 1226 error1: 1227 cancel_delayed_work_sync(&par->dwork); 1228 hv_set_drvdata(hdev, NULL); 1229 framebuffer_release(info); 1230 return ret; 1231 } 1232 1233 1234 static int hvfb_remove(struct hv_device *hdev) 1235 { 1236 struct fb_info *info = hv_get_drvdata(hdev); 1237 struct hvfb_par *par = info->par; 1238 1239 atomic_notifier_chain_unregister(&panic_notifier_list, 1240 &par->hvfb_panic_nb); 1241 1242 par->update = false; 1243 par->fb_ready = false; 1244 1245 fb_deferred_io_cleanup(info); 1246 1247 unregister_framebuffer(info); 1248 cancel_delayed_work_sync(&par->dwork); 1249 1250 vmbus_close(hdev->channel); 1251 hv_set_drvdata(hdev, NULL); 1252 1253 hvfb_putmem(hdev, info); 1254 framebuffer_release(info); 1255 1256 return 0; 1257 } 1258 1259 static int hvfb_suspend(struct hv_device *hdev) 1260 { 1261 struct fb_info *info = hv_get_drvdata(hdev); 1262 struct hvfb_par *par = info->par; 1263 1264 console_lock(); 1265 1266 /* 1 means do suspend */ 1267 fb_set_suspend(info, 1); 1268 1269 cancel_delayed_work_sync(&par->dwork); 1270 cancel_delayed_work_sync(&info->deferred_work); 1271 1272 par->update_saved = par->update; 1273 par->update = false; 1274 par->fb_ready = false; 1275 1276 vmbus_close(hdev->channel); 1277 1278 console_unlock(); 1279 1280 return 0; 1281 } 1282 1283 static int hvfb_resume(struct hv_device *hdev) 1284 { 1285 struct fb_info *info = hv_get_drvdata(hdev); 1286 struct hvfb_par *par = info->par; 1287 int ret; 1288 1289 console_lock(); 1290 1291 ret = synthvid_connect_vsp(hdev); 1292 if (ret != 0) 1293 goto out; 1294 1295 ret = synthvid_send_config(hdev); 1296 if (ret != 0) { 1297 vmbus_close(hdev->channel); 1298 goto out; 1299 } 1300 1301 par->fb_ready = true; 1302 par->update = par->update_saved; 1303 1304 schedule_delayed_work(&info->deferred_work, info->fbdefio->delay); 1305 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 1306 1307 /* 0 means do resume */ 1308 fb_set_suspend(info, 0); 1309 1310 out: 1311 console_unlock(); 1312 1313 return ret; 1314 } 1315 1316 1317 static const struct pci_device_id pci_stub_id_table[] = { 1318 { 1319 .vendor = PCI_VENDOR_ID_MICROSOFT, 1320 .device = PCI_DEVICE_ID_HYPERV_VIDEO, 1321 }, 1322 { /* end of list */ } 1323 }; 1324 1325 static const struct hv_vmbus_device_id id_table[] = { 1326 /* Synthetic Video Device GUID */ 1327 {HV_SYNTHVID_GUID}, 1328 {} 1329 }; 1330 1331 MODULE_DEVICE_TABLE(pci, pci_stub_id_table); 1332 MODULE_DEVICE_TABLE(vmbus, id_table); 1333 1334 static struct hv_driver hvfb_drv = { 1335 .name = KBUILD_MODNAME, 1336 .id_table = id_table, 1337 .probe = hvfb_probe, 1338 .remove = hvfb_remove, 1339 .suspend = hvfb_suspend, 1340 .resume = hvfb_resume, 1341 .driver = { 1342 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1343 }, 1344 }; 1345 1346 static int hvfb_pci_stub_probe(struct pci_dev *pdev, 1347 const struct pci_device_id *ent) 1348 { 1349 return 0; 1350 } 1351 1352 static void hvfb_pci_stub_remove(struct pci_dev *pdev) 1353 { 1354 } 1355 1356 static struct pci_driver hvfb_pci_stub_driver = { 1357 .name = KBUILD_MODNAME, 1358 .id_table = pci_stub_id_table, 1359 .probe = hvfb_pci_stub_probe, 1360 .remove = hvfb_pci_stub_remove, 1361 .driver = { 1362 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1363 } 1364 }; 1365 1366 static int __init hvfb_drv_init(void) 1367 { 1368 int ret; 1369 1370 ret = vmbus_driver_register(&hvfb_drv); 1371 if (ret != 0) 1372 return ret; 1373 1374 ret = pci_register_driver(&hvfb_pci_stub_driver); 1375 if (ret != 0) { 1376 vmbus_driver_unregister(&hvfb_drv); 1377 return ret; 1378 } 1379 1380 return 0; 1381 } 1382 1383 static void __exit hvfb_drv_exit(void) 1384 { 1385 pci_unregister_driver(&hvfb_pci_stub_driver); 1386 vmbus_driver_unregister(&hvfb_drv); 1387 } 1388 1389 module_init(hvfb_drv_init); 1390 module_exit(hvfb_drv_exit); 1391 1392 MODULE_LICENSE("GPL"); 1393 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver"); 1394