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 static void hvfb_putmem(struct fb_info *info); 286 287 /* Send message to Hyper-V host */ 288 static inline int synthvid_send(struct hv_device *hdev, 289 struct synthvid_msg *msg) 290 { 291 static atomic64_t request_id = ATOMIC64_INIT(0); 292 int ret; 293 294 msg->pipe_hdr.type = PIPE_MSG_DATA; 295 msg->pipe_hdr.size = msg->vid_hdr.size; 296 297 ret = vmbus_sendpacket(hdev->channel, msg, 298 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr), 299 atomic64_inc_return(&request_id), 300 VM_PKT_DATA_INBAND, 0); 301 302 if (ret) 303 pr_err_ratelimited("Unable to send packet via vmbus; error %d\n", ret); 304 305 return ret; 306 } 307 308 309 /* Send screen resolution info to host */ 310 static int synthvid_send_situ(struct hv_device *hdev) 311 { 312 struct fb_info *info = hv_get_drvdata(hdev); 313 struct synthvid_msg msg; 314 315 if (!info) 316 return -ENODEV; 317 318 memset(&msg, 0, sizeof(struct synthvid_msg)); 319 320 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE; 321 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 322 sizeof(struct synthvid_situation_update); 323 msg.situ.user_ctx = 0; 324 msg.situ.video_output_count = 1; 325 msg.situ.video_output[0].active = 1; 326 msg.situ.video_output[0].vram_offset = 0; 327 msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel; 328 msg.situ.video_output[0].width_pixels = info->var.xres; 329 msg.situ.video_output[0].height_pixels = info->var.yres; 330 msg.situ.video_output[0].pitch_bytes = info->fix.line_length; 331 332 synthvid_send(hdev, &msg); 333 334 return 0; 335 } 336 337 /* Send mouse pointer info to host */ 338 static int synthvid_send_ptr(struct hv_device *hdev) 339 { 340 struct synthvid_msg msg; 341 342 memset(&msg, 0, sizeof(struct synthvid_msg)); 343 msg.vid_hdr.type = SYNTHVID_POINTER_POSITION; 344 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 345 sizeof(struct synthvid_pointer_position); 346 msg.ptr_pos.is_visible = 1; 347 msg.ptr_pos.video_output = 0; 348 msg.ptr_pos.image_x = 0; 349 msg.ptr_pos.image_y = 0; 350 synthvid_send(hdev, &msg); 351 352 memset(&msg, 0, sizeof(struct synthvid_msg)); 353 msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE; 354 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 355 sizeof(struct synthvid_pointer_shape); 356 msg.ptr_shape.part_idx = CURSOR_COMPLETE; 357 msg.ptr_shape.is_argb = 1; 358 msg.ptr_shape.width = 1; 359 msg.ptr_shape.height = 1; 360 msg.ptr_shape.hot_x = 0; 361 msg.ptr_shape.hot_y = 0; 362 msg.ptr_shape.data[0] = 0; 363 msg.ptr_shape.data[1] = 1; 364 msg.ptr_shape.data[2] = 1; 365 msg.ptr_shape.data[3] = 1; 366 synthvid_send(hdev, &msg); 367 368 return 0; 369 } 370 371 /* Send updated screen area (dirty rectangle) location to host */ 372 static int 373 synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2) 374 { 375 struct hv_device *hdev = device_to_hv_device(info->device); 376 struct synthvid_msg msg; 377 378 memset(&msg, 0, sizeof(struct synthvid_msg)); 379 if (x2 == INT_MAX) 380 x2 = info->var.xres; 381 if (y2 == INT_MAX) 382 y2 = info->var.yres; 383 384 msg.vid_hdr.type = SYNTHVID_DIRT; 385 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 386 sizeof(struct synthvid_dirt); 387 msg.dirt.video_output = 0; 388 msg.dirt.dirt_count = 1; 389 msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1; 390 msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1; 391 msg.dirt.rect[0].x2 = 392 (x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2; 393 msg.dirt.rect[0].y2 = 394 (y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2; 395 396 synthvid_send(hdev, &msg); 397 398 return 0; 399 } 400 401 static void hvfb_docopy(struct hvfb_par *par, 402 unsigned long offset, 403 unsigned long size) 404 { 405 if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready || 406 size == 0 || offset >= dio_fb_size) 407 return; 408 409 if (offset + size > dio_fb_size) 410 size = dio_fb_size - offset; 411 412 memcpy(par->mmio_vp + offset, par->dio_vp + offset, size); 413 } 414 415 /* Deferred IO callback */ 416 static void synthvid_deferred_io(struct fb_info *p, struct list_head *pagereflist) 417 { 418 struct hvfb_par *par = p->par; 419 struct fb_deferred_io_pageref *pageref; 420 unsigned long start, end; 421 int y1, y2, miny, maxy; 422 423 miny = INT_MAX; 424 maxy = 0; 425 426 /* 427 * Merge dirty pages. It is possible that last page cross 428 * over the end of frame buffer row yres. This is taken care of 429 * in synthvid_update function by clamping the y2 430 * value to yres. 431 */ 432 list_for_each_entry(pageref, pagereflist, list) { 433 start = pageref->offset; 434 end = start + PAGE_SIZE - 1; 435 y1 = start / p->fix.line_length; 436 y2 = end / p->fix.line_length; 437 miny = min_t(int, miny, y1); 438 maxy = max_t(int, maxy, y2); 439 440 /* Copy from dio space to mmio address */ 441 if (par->fb_ready && par->need_docopy) 442 hvfb_docopy(par, start, PAGE_SIZE); 443 } 444 445 if (par->fb_ready && par->update) 446 synthvid_update(p, 0, miny, p->var.xres, maxy + 1); 447 } 448 449 static struct fb_deferred_io synthvid_defio = { 450 .delay = HZ / 20, 451 .deferred_io = synthvid_deferred_io, 452 }; 453 454 /* 455 * Actions on received messages from host: 456 * Complete the wait event. 457 * Or, reply with screen and cursor info. 458 */ 459 static void synthvid_recv_sub(struct hv_device *hdev) 460 { 461 struct fb_info *info = hv_get_drvdata(hdev); 462 struct hvfb_par *par; 463 struct synthvid_msg *msg; 464 465 if (!info) 466 return; 467 468 par = info->par; 469 msg = (struct synthvid_msg *)par->recv_buf; 470 471 /* Complete the wait event */ 472 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE || 473 msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE || 474 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) { 475 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE); 476 complete(&par->wait); 477 return; 478 } 479 480 /* Reply with screen and cursor info */ 481 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) { 482 if (par->fb_ready) { 483 synthvid_send_ptr(hdev); 484 synthvid_send_situ(hdev); 485 } 486 487 par->update = msg->feature_chg.is_dirt_needed; 488 if (par->update) 489 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 490 } 491 } 492 493 /* Receive callback for messages from the host */ 494 static void synthvid_receive(void *ctx) 495 { 496 struct hv_device *hdev = ctx; 497 struct fb_info *info = hv_get_drvdata(hdev); 498 struct hvfb_par *par; 499 struct synthvid_msg *recv_buf; 500 u32 bytes_recvd; 501 u64 req_id; 502 int ret; 503 504 if (!info) 505 return; 506 507 par = info->par; 508 recv_buf = (struct synthvid_msg *)par->recv_buf; 509 510 do { 511 ret = vmbus_recvpacket(hdev->channel, recv_buf, 512 MAX_VMBUS_PKT_SIZE, 513 &bytes_recvd, &req_id); 514 if (bytes_recvd > 0 && 515 recv_buf->pipe_hdr.type == PIPE_MSG_DATA) 516 synthvid_recv_sub(hdev); 517 } while (bytes_recvd > 0 && ret == 0); 518 } 519 520 /* Check if the ver1 version is equal or greater than ver2 */ 521 static inline bool synthvid_ver_ge(u32 ver1, u32 ver2) 522 { 523 if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) || 524 (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) && 525 SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2))) 526 return true; 527 528 return false; 529 } 530 531 /* Check synthetic video protocol version with the host */ 532 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver) 533 { 534 struct fb_info *info = hv_get_drvdata(hdev); 535 struct hvfb_par *par = info->par; 536 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 537 int ret = 0; 538 unsigned long t; 539 540 memset(msg, 0, sizeof(struct synthvid_msg)); 541 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST; 542 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 543 sizeof(struct synthvid_version_req); 544 msg->ver_req.version = ver; 545 synthvid_send(hdev, msg); 546 547 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 548 if (!t) { 549 pr_err("Time out on waiting version response\n"); 550 ret = -ETIMEDOUT; 551 goto out; 552 } 553 if (!msg->ver_resp.is_accepted) { 554 ret = -ENODEV; 555 goto out; 556 } 557 558 par->synthvid_version = ver; 559 pr_info("Synthvid Version major %d, minor %d\n", 560 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver)); 561 562 out: 563 return ret; 564 } 565 566 /* Get current resolution from the host */ 567 static int synthvid_get_supported_resolution(struct hv_device *hdev) 568 { 569 struct fb_info *info = hv_get_drvdata(hdev); 570 struct hvfb_par *par = info->par; 571 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 572 int ret = 0; 573 unsigned long t; 574 u8 index; 575 576 memset(msg, 0, sizeof(struct synthvid_msg)); 577 msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST; 578 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 579 sizeof(struct synthvid_supported_resolution_req); 580 581 msg->resolution_req.maximum_resolution_count = 582 SYNTHVID_MAX_RESOLUTION_COUNT; 583 synthvid_send(hdev, msg); 584 585 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 586 if (!t) { 587 pr_err("Time out on waiting resolution response\n"); 588 ret = -ETIMEDOUT; 589 goto out; 590 } 591 592 if (msg->resolution_resp.resolution_count == 0) { 593 pr_err("No supported resolutions\n"); 594 ret = -ENODEV; 595 goto out; 596 } 597 598 index = msg->resolution_resp.default_resolution_index; 599 if (index >= msg->resolution_resp.resolution_count) { 600 pr_err("Invalid resolution index: %d\n", index); 601 ret = -ENODEV; 602 goto out; 603 } 604 605 screen_width = 606 msg->resolution_resp.supported_resolution[index].width; 607 screen_height = 608 msg->resolution_resp.supported_resolution[index].height; 609 610 out: 611 return ret; 612 } 613 614 /* Connect to VSP (Virtual Service Provider) on host */ 615 static int synthvid_connect_vsp(struct hv_device *hdev) 616 { 617 struct fb_info *info = hv_get_drvdata(hdev); 618 struct hvfb_par *par = info->par; 619 int ret; 620 621 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE, 622 NULL, 0, synthvid_receive, hdev); 623 if (ret) { 624 pr_err("Unable to open vmbus channel\n"); 625 return ret; 626 } 627 628 /* Negotiate the protocol version with host */ 629 switch (vmbus_proto_version) { 630 case VERSION_WIN10: 631 case VERSION_WIN10_V5: 632 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 633 if (!ret) 634 break; 635 fallthrough; 636 case VERSION_WIN8: 637 case VERSION_WIN8_1: 638 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8); 639 break; 640 default: 641 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 642 break; 643 } 644 645 if (ret) { 646 pr_err("Synthetic video device version not accepted\n"); 647 goto error; 648 } 649 650 screen_depth = SYNTHVID_DEPTH_WIN8; 651 if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) { 652 ret = synthvid_get_supported_resolution(hdev); 653 if (ret) 654 pr_info("Failed to get supported resolution from host, use default\n"); 655 } 656 657 screen_fb_size = hdev->channel->offermsg.offer. 658 mmio_megabytes * 1024 * 1024; 659 660 return 0; 661 662 error: 663 vmbus_close(hdev->channel); 664 return ret; 665 } 666 667 /* Send VRAM and Situation messages to the host */ 668 static int synthvid_send_config(struct hv_device *hdev) 669 { 670 struct fb_info *info = hv_get_drvdata(hdev); 671 struct hvfb_par *par = info->par; 672 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 673 int ret = 0; 674 unsigned long t; 675 676 /* Send VRAM location */ 677 memset(msg, 0, sizeof(struct synthvid_msg)); 678 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION; 679 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 680 sizeof(struct synthvid_vram_location); 681 msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp; 682 msg->vram.is_vram_gpa_specified = 1; 683 synthvid_send(hdev, msg); 684 685 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 686 if (!t) { 687 pr_err("Time out on waiting vram location ack\n"); 688 ret = -ETIMEDOUT; 689 goto out; 690 } 691 if (msg->vram_ack.user_ctx != par->mmio_pp) { 692 pr_err("Unable to set VRAM location\n"); 693 ret = -ENODEV; 694 goto out; 695 } 696 697 /* Send pointer and situation update */ 698 synthvid_send_ptr(hdev); 699 synthvid_send_situ(hdev); 700 701 out: 702 return ret; 703 } 704 705 706 /* 707 * Delayed work callback: 708 * It is scheduled to call whenever update request is received and it has 709 * not been called in last HVFB_ONDEMAND_THROTTLE time interval. 710 */ 711 static void hvfb_update_work(struct work_struct *w) 712 { 713 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work); 714 struct fb_info *info = par->info; 715 unsigned long flags; 716 int x1, x2, y1, y2; 717 int j; 718 719 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 720 /* Reset the request flag */ 721 par->delayed_refresh = false; 722 723 /* Store the dirty rectangle to local variables */ 724 x1 = par->x1; 725 x2 = par->x2; 726 y1 = par->y1; 727 y2 = par->y2; 728 729 /* Clear dirty rectangle */ 730 par->x1 = par->y1 = INT_MAX; 731 par->x2 = par->y2 = 0; 732 733 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 734 735 if (x1 > info->var.xres || x2 > info->var.xres || 736 y1 > info->var.yres || y2 > info->var.yres || x2 <= x1) 737 return; 738 739 /* Copy the dirty rectangle to frame buffer memory */ 740 if (par->need_docopy) 741 for (j = y1; j < y2; j++) 742 hvfb_docopy(par, 743 j * info->fix.line_length + 744 (x1 * screen_depth / 8), 745 (x2 - x1) * screen_depth / 8); 746 747 /* Refresh */ 748 if (par->fb_ready && par->update) 749 synthvid_update(info, x1, y1, x2, y2); 750 } 751 752 /* 753 * Control the on-demand refresh frequency. It schedules a delayed 754 * screen update if it has not yet. 755 */ 756 static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par, 757 int x1, int y1, int w, int h) 758 { 759 unsigned long flags; 760 int x2 = x1 + w; 761 int y2 = y1 + h; 762 763 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 764 765 /* Merge dirty rectangle */ 766 par->x1 = min_t(int, par->x1, x1); 767 par->y1 = min_t(int, par->y1, y1); 768 par->x2 = max_t(int, par->x2, x2); 769 par->y2 = max_t(int, par->y2, y2); 770 771 /* Schedule a delayed screen update if not yet */ 772 if (par->delayed_refresh == false) { 773 schedule_delayed_work(&par->dwork, 774 HVFB_ONDEMAND_THROTTLE); 775 par->delayed_refresh = true; 776 } 777 778 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 779 } 780 781 static int hvfb_on_panic(struct notifier_block *nb, 782 unsigned long e, void *p) 783 { 784 struct hv_device *hdev; 785 struct hvfb_par *par; 786 struct fb_info *info; 787 788 par = container_of(nb, struct hvfb_par, hvfb_panic_nb); 789 info = par->info; 790 hdev = device_to_hv_device(info->device); 791 792 if (hv_ringbuffer_spinlock_busy(hdev->channel)) 793 return NOTIFY_DONE; 794 795 par->synchronous_fb = true; 796 if (par->need_docopy) 797 hvfb_docopy(par, 0, dio_fb_size); 798 synthvid_update(info, 0, 0, INT_MAX, INT_MAX); 799 800 return NOTIFY_DONE; 801 } 802 803 /* Framebuffer operation handlers */ 804 805 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 806 { 807 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN || 808 var->xres > screen_width || var->yres > screen_height || 809 var->bits_per_pixel != screen_depth) 810 return -EINVAL; 811 812 var->xres_virtual = var->xres; 813 var->yres_virtual = var->yres; 814 815 return 0; 816 } 817 818 static int hvfb_set_par(struct fb_info *info) 819 { 820 struct hv_device *hdev = device_to_hv_device(info->device); 821 822 return synthvid_send_situ(hdev); 823 } 824 825 826 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf) 827 { 828 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; 829 } 830 831 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green, 832 unsigned blue, unsigned transp, struct fb_info *info) 833 { 834 u32 *pal = info->pseudo_palette; 835 836 if (regno > 15) 837 return -EINVAL; 838 839 pal[regno] = chan_to_field(red, &info->var.red) 840 | chan_to_field(green, &info->var.green) 841 | chan_to_field(blue, &info->var.blue) 842 | chan_to_field(transp, &info->var.transp); 843 844 return 0; 845 } 846 847 static int hvfb_blank(int blank, struct fb_info *info) 848 { 849 return 1; /* get fb_blank to set the colormap to all black */ 850 } 851 852 static void hvfb_ops_damage_range(struct fb_info *info, off_t off, size_t len) 853 { 854 /* TODO: implement damage handling */ 855 } 856 857 static void hvfb_ops_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height) 858 { 859 struct hvfb_par *par = info->par; 860 861 if (par->synchronous_fb) 862 synthvid_update(info, 0, 0, INT_MAX, INT_MAX); 863 else 864 hvfb_ondemand_refresh_throttle(par, x, y, width, height); 865 } 866 867 /* 868 * fb_ops.fb_destroy is called by the last put_fb_info() call at the end 869 * of unregister_framebuffer() or fb_release(). Do any cleanup related to 870 * framebuffer here. 871 */ 872 static void hvfb_destroy(struct fb_info *info) 873 { 874 hvfb_putmem(info); 875 framebuffer_release(info); 876 } 877 878 /* 879 * TODO: GEN1 codepaths allocate from system or DMA-able memory. Fix the 880 * driver to use the _SYSMEM_ or _DMAMEM_ helpers in these cases. 881 */ 882 FB_GEN_DEFAULT_DEFERRED_IOMEM_OPS(hvfb_ops, 883 hvfb_ops_damage_range, 884 hvfb_ops_damage_area) 885 886 static const struct fb_ops hvfb_ops = { 887 .owner = THIS_MODULE, 888 FB_DEFAULT_DEFERRED_OPS(hvfb_ops), 889 .fb_check_var = hvfb_check_var, 890 .fb_set_par = hvfb_set_par, 891 .fb_setcolreg = hvfb_setcolreg, 892 .fb_blank = hvfb_blank, 893 .fb_destroy = hvfb_destroy, 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_PAGE_ORDER) { 944 /* Call alloc_pages if the size is less than 2^MAX_PAGE_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 device *device, 970 phys_addr_t paddr, unsigned int size) 971 { 972 unsigned int order = get_order(size); 973 974 if (order <= MAX_PAGE_ORDER) 975 __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order); 976 else 977 dma_free_coherent(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 resource_size_t base = 0; 992 resource_size_t size = 0; 993 phys_addr_t paddr; 994 int ret; 995 996 if (!gen2vm) { 997 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT, 998 PCI_DEVICE_ID_HYPERV_VIDEO, NULL); 999 if (!pdev) { 1000 pr_err("Unable to find PCI Hyper-V video\n"); 1001 return -ENODEV; 1002 } 1003 1004 base = pci_resource_start(pdev, 0); 1005 size = pci_resource_len(pdev, 0); 1006 aperture_remove_conflicting_devices(base, size, KBUILD_MODNAME); 1007 1008 /* 1009 * For Gen 1 VM, we can directly use the contiguous memory 1010 * from VM. If we succeed, deferred IO happens directly 1011 * on this allocated framebuffer memory, avoiding extra 1012 * memory copy. 1013 */ 1014 paddr = hvfb_get_phymem(hdev, screen_fb_size); 1015 if (paddr != (phys_addr_t) -1) { 1016 par->mmio_pp = paddr; 1017 par->mmio_vp = par->dio_vp = __va(paddr); 1018 1019 info->fix.smem_start = paddr; 1020 info->fix.smem_len = screen_fb_size; 1021 info->screen_base = par->mmio_vp; 1022 info->screen_size = screen_fb_size; 1023 1024 par->need_docopy = false; 1025 goto getmem_done; 1026 } 1027 pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n"); 1028 } else { 1029 aperture_remove_all_conflicting_devices(KBUILD_MODNAME); 1030 } 1031 1032 /* 1033 * Cannot use contiguous physical memory, so allocate MMIO space for 1034 * the framebuffer. At this point in the function, conflicting devices 1035 * that might have claimed the framebuffer MMIO space based on 1036 * screen_info.lfb_base must have already been removed so that 1037 * vmbus_allocate_mmio() does not allocate different MMIO space. If the 1038 * kdump image were to be loaded using kexec_file_load(), the 1039 * framebuffer location in the kdump image would be set from 1040 * screen_info.lfb_base at the time that kdump is enabled. If the 1041 * framebuffer has moved elsewhere, this could be the wrong location, 1042 * causing kdump to hang when efifb (for example) loads. 1043 */ 1044 dio_fb_size = 1045 screen_width * screen_height * screen_depth / 8; 1046 1047 ret = vmbus_allocate_mmio(&par->mem, hdev, 0, -1, 1048 screen_fb_size, 0x100000, true); 1049 if (ret != 0) { 1050 pr_err("Unable to allocate framebuffer memory\n"); 1051 goto err1; 1052 } 1053 1054 /* 1055 * Map the VRAM cacheable for performance. This is also required for 1056 * VM Connect to display properly for ARM64 Linux VM, as the host also 1057 * maps the VRAM cacheable. 1058 */ 1059 fb_virt = ioremap_cache(par->mem->start, screen_fb_size); 1060 if (!fb_virt) 1061 goto err2; 1062 1063 /* Allocate memory for deferred IO */ 1064 par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE)); 1065 if (par->dio_vp == NULL) 1066 goto err3; 1067 1068 /* Physical address of FB device */ 1069 par->mmio_pp = par->mem->start; 1070 /* Virtual address of FB device */ 1071 par->mmio_vp = (unsigned char *) fb_virt; 1072 1073 info->fix.smem_start = par->mem->start; 1074 info->fix.smem_len = dio_fb_size; 1075 info->screen_base = par->dio_vp; 1076 info->screen_size = dio_fb_size; 1077 1078 getmem_done: 1079 if (!gen2vm) 1080 pci_dev_put(pdev); 1081 1082 return 0; 1083 1084 err3: 1085 iounmap(fb_virt); 1086 err2: 1087 vmbus_free_mmio(par->mem->start, screen_fb_size); 1088 par->mem = NULL; 1089 err1: 1090 if (!gen2vm) 1091 pci_dev_put(pdev); 1092 1093 return -ENOMEM; 1094 } 1095 1096 /* Release the framebuffer */ 1097 static void hvfb_putmem(struct fb_info *info) 1098 { 1099 struct hvfb_par *par = info->par; 1100 1101 if (par->need_docopy) { 1102 vfree(par->dio_vp); 1103 iounmap(par->mmio_vp); 1104 vmbus_free_mmio(par->mem->start, screen_fb_size); 1105 } else { 1106 hvfb_release_phymem(info->device, info->fix.smem_start, 1107 screen_fb_size); 1108 } 1109 1110 par->mem = NULL; 1111 } 1112 1113 1114 static int hvfb_probe(struct hv_device *hdev, 1115 const struct hv_vmbus_device_id *dev_id) 1116 { 1117 struct fb_info *info; 1118 struct hvfb_par *par; 1119 int ret; 1120 1121 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device); 1122 if (!info) 1123 return -ENOMEM; 1124 1125 par = info->par; 1126 par->info = info; 1127 par->fb_ready = false; 1128 par->need_docopy = true; 1129 init_completion(&par->wait); 1130 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work); 1131 1132 par->delayed_refresh = false; 1133 spin_lock_init(&par->delayed_refresh_lock); 1134 par->x1 = par->y1 = INT_MAX; 1135 par->x2 = par->y2 = 0; 1136 1137 /* Connect to VSP */ 1138 hv_set_drvdata(hdev, info); 1139 ret = synthvid_connect_vsp(hdev); 1140 if (ret) { 1141 pr_err("Unable to connect to VSP\n"); 1142 goto error1; 1143 } 1144 1145 hvfb_get_option(info); 1146 pr_info("Screen resolution: %dx%d, Color depth: %d, Frame buffer size: %d\n", 1147 screen_width, screen_height, screen_depth, screen_fb_size); 1148 1149 ret = hvfb_getmem(hdev, info); 1150 if (ret) { 1151 pr_err("No memory for framebuffer\n"); 1152 goto error2; 1153 } 1154 1155 /* Set up fb_info */ 1156 info->var.xres_virtual = info->var.xres = screen_width; 1157 info->var.yres_virtual = info->var.yres = screen_height; 1158 info->var.bits_per_pixel = screen_depth; 1159 1160 if (info->var.bits_per_pixel == 16) { 1161 info->var.red = (struct fb_bitfield){11, 5, 0}; 1162 info->var.green = (struct fb_bitfield){5, 6, 0}; 1163 info->var.blue = (struct fb_bitfield){0, 5, 0}; 1164 info->var.transp = (struct fb_bitfield){0, 0, 0}; 1165 } else { 1166 info->var.red = (struct fb_bitfield){16, 8, 0}; 1167 info->var.green = (struct fb_bitfield){8, 8, 0}; 1168 info->var.blue = (struct fb_bitfield){0, 8, 0}; 1169 info->var.transp = (struct fb_bitfield){24, 8, 0}; 1170 } 1171 1172 info->var.activate = FB_ACTIVATE_NOW; 1173 info->var.height = -1; 1174 info->var.width = -1; 1175 info->var.vmode = FB_VMODE_NONINTERLACED; 1176 1177 strcpy(info->fix.id, KBUILD_MODNAME); 1178 info->fix.type = FB_TYPE_PACKED_PIXELS; 1179 info->fix.visual = FB_VISUAL_TRUECOLOR; 1180 info->fix.line_length = screen_width * screen_depth / 8; 1181 info->fix.accel = FB_ACCEL_NONE; 1182 1183 info->fbops = &hvfb_ops; 1184 info->pseudo_palette = par->pseudo_palette; 1185 1186 /* Initialize deferred IO */ 1187 info->fbdefio = &synthvid_defio; 1188 fb_deferred_io_init(info); 1189 1190 /* Send config to host */ 1191 ret = synthvid_send_config(hdev); 1192 if (ret) 1193 goto error; 1194 1195 ret = devm_register_framebuffer(&hdev->device, info); 1196 if (ret) { 1197 pr_err("Unable to register framebuffer\n"); 1198 goto error; 1199 } 1200 1201 par->fb_ready = true; 1202 1203 par->synchronous_fb = false; 1204 1205 /* 1206 * We need to be sure this panic notifier runs _before_ the 1207 * vmbus disconnect, so order it by priority. It must execute 1208 * before the function hv_panic_vmbus_unload() [drivers/hv/vmbus_drv.c], 1209 * which is almost at the end of list, with priority = INT_MIN + 1. 1210 */ 1211 par->hvfb_panic_nb.notifier_call = hvfb_on_panic; 1212 par->hvfb_panic_nb.priority = INT_MIN + 10; 1213 atomic_notifier_chain_register(&panic_notifier_list, 1214 &par->hvfb_panic_nb); 1215 1216 return 0; 1217 1218 error: 1219 fb_deferred_io_cleanup(info); 1220 hvfb_putmem(info); 1221 error2: 1222 vmbus_close(hdev->channel); 1223 error1: 1224 cancel_delayed_work_sync(&par->dwork); 1225 hv_set_drvdata(hdev, NULL); 1226 framebuffer_release(info); 1227 return ret; 1228 } 1229 1230 static void hvfb_remove(struct hv_device *hdev) 1231 { 1232 struct fb_info *info = hv_get_drvdata(hdev); 1233 struct hvfb_par *par = info->par; 1234 1235 atomic_notifier_chain_unregister(&panic_notifier_list, 1236 &par->hvfb_panic_nb); 1237 1238 par->update = false; 1239 par->fb_ready = false; 1240 1241 fb_deferred_io_cleanup(info); 1242 1243 cancel_delayed_work_sync(&par->dwork); 1244 1245 vmbus_close(hdev->channel); 1246 hv_set_drvdata(hdev, NULL); 1247 } 1248 1249 static int hvfb_suspend(struct hv_device *hdev) 1250 { 1251 struct fb_info *info = hv_get_drvdata(hdev); 1252 struct hvfb_par *par = info->par; 1253 1254 console_lock(); 1255 1256 /* 1 means do suspend */ 1257 fb_set_suspend(info, 1); 1258 1259 cancel_delayed_work_sync(&par->dwork); 1260 cancel_delayed_work_sync(&info->deferred_work); 1261 1262 par->update_saved = par->update; 1263 par->update = false; 1264 par->fb_ready = false; 1265 1266 vmbus_close(hdev->channel); 1267 1268 console_unlock(); 1269 1270 return 0; 1271 } 1272 1273 static int hvfb_resume(struct hv_device *hdev) 1274 { 1275 struct fb_info *info = hv_get_drvdata(hdev); 1276 struct hvfb_par *par = info->par; 1277 int ret; 1278 1279 console_lock(); 1280 1281 ret = synthvid_connect_vsp(hdev); 1282 if (ret != 0) 1283 goto out; 1284 1285 ret = synthvid_send_config(hdev); 1286 if (ret != 0) { 1287 vmbus_close(hdev->channel); 1288 goto out; 1289 } 1290 1291 par->fb_ready = true; 1292 par->update = par->update_saved; 1293 1294 schedule_delayed_work(&info->deferred_work, info->fbdefio->delay); 1295 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 1296 1297 /* 0 means do resume */ 1298 fb_set_suspend(info, 0); 1299 1300 out: 1301 console_unlock(); 1302 1303 return ret; 1304 } 1305 1306 1307 static const struct pci_device_id pci_stub_id_table[] = { 1308 { 1309 .vendor = PCI_VENDOR_ID_MICROSOFT, 1310 .device = PCI_DEVICE_ID_HYPERV_VIDEO, 1311 }, 1312 { /* end of list */ } 1313 }; 1314 1315 static const struct hv_vmbus_device_id id_table[] = { 1316 /* Synthetic Video Device GUID */ 1317 {HV_SYNTHVID_GUID}, 1318 {} 1319 }; 1320 1321 MODULE_DEVICE_TABLE(pci, pci_stub_id_table); 1322 MODULE_DEVICE_TABLE(vmbus, id_table); 1323 1324 static struct hv_driver hvfb_drv = { 1325 .name = KBUILD_MODNAME, 1326 .id_table = id_table, 1327 .probe = hvfb_probe, 1328 .remove = hvfb_remove, 1329 .suspend = hvfb_suspend, 1330 .resume = hvfb_resume, 1331 .driver = { 1332 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1333 }, 1334 }; 1335 1336 static int hvfb_pci_stub_probe(struct pci_dev *pdev, 1337 const struct pci_device_id *ent) 1338 { 1339 return 0; 1340 } 1341 1342 static void hvfb_pci_stub_remove(struct pci_dev *pdev) 1343 { 1344 } 1345 1346 static struct pci_driver hvfb_pci_stub_driver = { 1347 .name = KBUILD_MODNAME, 1348 .id_table = pci_stub_id_table, 1349 .probe = hvfb_pci_stub_probe, 1350 .remove = hvfb_pci_stub_remove, 1351 .driver = { 1352 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1353 } 1354 }; 1355 1356 static int __init hvfb_drv_init(void) 1357 { 1358 int ret; 1359 1360 if (fb_modesetting_disabled("hyper_fb")) 1361 return -ENODEV; 1362 1363 ret = vmbus_driver_register(&hvfb_drv); 1364 if (ret != 0) 1365 return ret; 1366 1367 ret = pci_register_driver(&hvfb_pci_stub_driver); 1368 if (ret != 0) { 1369 vmbus_driver_unregister(&hvfb_drv); 1370 return ret; 1371 } 1372 1373 return 0; 1374 } 1375 1376 static void __exit hvfb_drv_exit(void) 1377 { 1378 pci_unregister_driver(&hvfb_pci_stub_driver); 1379 vmbus_driver_unregister(&hvfb_drv); 1380 } 1381 1382 module_init(hvfb_drv_init); 1383 module_exit(hvfb_drv_exit); 1384 1385 MODULE_LICENSE("GPL"); 1386 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver"); 1387