1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Mediated virtual PCI display host device driver 4 * 5 * Emulate enough of qemu stdvga to make bochs-drm.ko happy. That is 6 * basically the vram memory bar and the bochs dispi interface vbe 7 * registers in the mmio register bar. Specifically it does *not* 8 * include any legacy vga stuff. Device looks a lot like "qemu -device 9 * secondary-vga". 10 * 11 * (c) Gerd Hoffmann <kraxel@redhat.com> 12 * 13 * based on mtty driver which is: 14 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. 15 * Author: Neo Jia <cjia@nvidia.com> 16 * Kirti Wankhede <kwankhede@nvidia.com> 17 * 18 * This program is free software; you can redistribute it and/or modify 19 * it under the terms of the GNU General Public License version 2 as 20 * published by the Free Software Foundation. 21 */ 22 #include <linux/init.h> 23 #include <linux/module.h> 24 #include <linux/kernel.h> 25 #include <linux/slab.h> 26 #include <linux/vmalloc.h> 27 #include <linux/cdev.h> 28 #include <linux/vfio.h> 29 #include <linux/iommu.h> 30 #include <linux/sysfs.h> 31 #include <linux/mdev.h> 32 #include <linux/pci.h> 33 #include <linux/dma-buf.h> 34 #include <linux/highmem.h> 35 #include <drm/drm_fourcc.h> 36 #include <drm/drm_rect.h> 37 #include <drm/drm_modeset_lock.h> 38 #include <drm/drm_property.h> 39 #include <drm/drm_plane.h> 40 41 42 #define VBE_DISPI_INDEX_ID 0x0 43 #define VBE_DISPI_INDEX_XRES 0x1 44 #define VBE_DISPI_INDEX_YRES 0x2 45 #define VBE_DISPI_INDEX_BPP 0x3 46 #define VBE_DISPI_INDEX_ENABLE 0x4 47 #define VBE_DISPI_INDEX_BANK 0x5 48 #define VBE_DISPI_INDEX_VIRT_WIDTH 0x6 49 #define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7 50 #define VBE_DISPI_INDEX_X_OFFSET 0x8 51 #define VBE_DISPI_INDEX_Y_OFFSET 0x9 52 #define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa 53 #define VBE_DISPI_INDEX_COUNT 0xb 54 55 #define VBE_DISPI_ID0 0xB0C0 56 #define VBE_DISPI_ID1 0xB0C1 57 #define VBE_DISPI_ID2 0xB0C2 58 #define VBE_DISPI_ID3 0xB0C3 59 #define VBE_DISPI_ID4 0xB0C4 60 #define VBE_DISPI_ID5 0xB0C5 61 62 #define VBE_DISPI_DISABLED 0x00 63 #define VBE_DISPI_ENABLED 0x01 64 #define VBE_DISPI_GETCAPS 0x02 65 #define VBE_DISPI_8BIT_DAC 0x20 66 #define VBE_DISPI_LFB_ENABLED 0x40 67 #define VBE_DISPI_NOCLEARMEM 0x80 68 69 70 #define MBOCHS_NAME "mbochs" 71 #define MBOCHS_CLASS_NAME "mbochs" 72 73 #define MBOCHS_EDID_REGION_INDEX VFIO_PCI_NUM_REGIONS 74 #define MBOCHS_NUM_REGIONS (MBOCHS_EDID_REGION_INDEX+1) 75 76 #define MBOCHS_CONFIG_SPACE_SIZE 0xff 77 #define MBOCHS_MMIO_BAR_OFFSET PAGE_SIZE 78 #define MBOCHS_MMIO_BAR_SIZE PAGE_SIZE 79 #define MBOCHS_EDID_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \ 80 MBOCHS_MMIO_BAR_SIZE) 81 #define MBOCHS_EDID_SIZE PAGE_SIZE 82 #define MBOCHS_MEMORY_BAR_OFFSET (MBOCHS_EDID_OFFSET + \ 83 MBOCHS_EDID_SIZE) 84 85 #define MBOCHS_EDID_BLOB_OFFSET (MBOCHS_EDID_SIZE/2) 86 87 #define STORE_LE16(addr, val) (*(u16 *)addr = val) 88 #define STORE_LE32(addr, val) (*(u32 *)addr = val) 89 90 91 MODULE_DESCRIPTION("Mediated virtual PCI display host device driver"); 92 MODULE_LICENSE("GPL v2"); 93 94 static int max_mbytes = 256; 95 module_param_named(count, max_mbytes, int, 0444); 96 MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices"); 97 98 99 #define MBOCHS_TYPE_1 "small" 100 #define MBOCHS_TYPE_2 "medium" 101 #define MBOCHS_TYPE_3 "large" 102 103 static struct mbochs_type { 104 struct mdev_type type; 105 u32 mbytes; 106 u32 max_x; 107 u32 max_y; 108 } mbochs_types[] = { 109 { 110 .type.sysfs_name = MBOCHS_TYPE_1, 111 .type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1, 112 .mbytes = 4, 113 .max_x = 800, 114 .max_y = 600, 115 }, { 116 .type.sysfs_name = MBOCHS_TYPE_2, 117 .type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2, 118 .mbytes = 16, 119 .max_x = 1920, 120 .max_y = 1440, 121 }, { 122 .type.sysfs_name = MBOCHS_TYPE_3, 123 .type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3, 124 .mbytes = 64, 125 .max_x = 0, 126 .max_y = 0, 127 }, 128 }; 129 130 static struct mdev_type *mbochs_mdev_types[] = { 131 &mbochs_types[0].type, 132 &mbochs_types[1].type, 133 &mbochs_types[2].type, 134 }; 135 136 static dev_t mbochs_devt; 137 static const struct class mbochs_class = { 138 .name = MBOCHS_CLASS_NAME, 139 }; 140 static struct cdev mbochs_cdev; 141 static struct device mbochs_dev; 142 static struct mdev_parent mbochs_parent; 143 static atomic_t mbochs_avail_mbytes; 144 static const struct vfio_device_ops mbochs_dev_ops; 145 146 struct vfio_region_info_ext { 147 struct vfio_region_info base; 148 struct vfio_region_info_cap_type type; 149 }; 150 151 struct mbochs_mode { 152 u32 drm_format; 153 u32 bytepp; 154 u32 width; 155 u32 height; 156 u32 stride; 157 u32 __pad; 158 u64 offset; 159 u64 size; 160 }; 161 162 struct mbochs_dmabuf { 163 struct mbochs_mode mode; 164 u32 id; 165 struct page **pages; 166 pgoff_t pagecount; 167 struct dma_buf *buf; 168 struct mdev_state *mdev_state; 169 struct list_head next; 170 bool unlinked; 171 }; 172 173 /* State of each mdev device */ 174 struct mdev_state { 175 struct vfio_device vdev; 176 u8 *vconfig; 177 u64 bar_mask[3]; 178 u32 memory_bar_mask; 179 struct mutex ops_lock; 180 struct mdev_device *mdev; 181 182 const struct mbochs_type *type; 183 u16 vbe[VBE_DISPI_INDEX_COUNT]; 184 u64 memsize; 185 struct page **pages; 186 pgoff_t pagecount; 187 struct vfio_region_gfx_edid edid_regs; 188 u8 edid_blob[0x400]; 189 190 struct list_head dmabufs; 191 u32 active_id; 192 u32 next_id; 193 }; 194 195 static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = { 196 [VBE_DISPI_INDEX_ID] = "id", 197 [VBE_DISPI_INDEX_XRES] = "xres", 198 [VBE_DISPI_INDEX_YRES] = "yres", 199 [VBE_DISPI_INDEX_BPP] = "bpp", 200 [VBE_DISPI_INDEX_ENABLE] = "enable", 201 [VBE_DISPI_INDEX_BANK] = "bank", 202 [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width", 203 [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height", 204 [VBE_DISPI_INDEX_X_OFFSET] = "x-offset", 205 [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset", 206 [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem", 207 }; 208 209 static const char *vbe_name(u32 index) 210 { 211 if (index < ARRAY_SIZE(vbe_name_list)) 212 return vbe_name_list[index]; 213 return "(invalid)"; 214 } 215 216 static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 217 pgoff_t pgoff); 218 static struct page *mbochs_get_page(struct mdev_state *mdev_state, 219 pgoff_t pgoff); 220 221 static void mbochs_create_config_space(struct mdev_state *mdev_state) 222 { 223 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID], 224 0x1234); 225 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID], 226 0x1111); 227 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID], 228 PCI_SUBVENDOR_ID_REDHAT_QUMRANET); 229 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID], 230 PCI_SUBDEVICE_ID_QEMU); 231 232 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND], 233 PCI_COMMAND_IO | PCI_COMMAND_MEMORY); 234 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE], 235 PCI_CLASS_DISPLAY_OTHER); 236 mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01; 237 238 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0], 239 PCI_BASE_ADDRESS_SPACE_MEMORY | 240 PCI_BASE_ADDRESS_MEM_TYPE_32 | 241 PCI_BASE_ADDRESS_MEM_PREFETCH); 242 mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1; 243 244 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2], 245 PCI_BASE_ADDRESS_SPACE_MEMORY | 246 PCI_BASE_ADDRESS_MEM_TYPE_32); 247 mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1; 248 } 249 250 static int mbochs_check_framebuffer(struct mdev_state *mdev_state, 251 struct mbochs_mode *mode) 252 { 253 struct device *dev = mdev_dev(mdev_state->mdev); 254 u16 *vbe = mdev_state->vbe; 255 u32 virt_width; 256 257 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 258 259 if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) 260 goto nofb; 261 262 memset(mode, 0, sizeof(*mode)); 263 switch (vbe[VBE_DISPI_INDEX_BPP]) { 264 case 32: 265 mode->drm_format = DRM_FORMAT_XRGB8888; 266 mode->bytepp = 4; 267 break; 268 default: 269 dev_info_ratelimited(dev, "%s: bpp %d not supported\n", 270 __func__, vbe[VBE_DISPI_INDEX_BPP]); 271 goto nofb; 272 } 273 274 mode->width = vbe[VBE_DISPI_INDEX_XRES]; 275 mode->height = vbe[VBE_DISPI_INDEX_YRES]; 276 virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH]; 277 if (virt_width < mode->width) 278 virt_width = mode->width; 279 mode->stride = virt_width * mode->bytepp; 280 mode->size = (u64)mode->stride * mode->height; 281 mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp + 282 (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride); 283 284 if (mode->width < 64 || mode->height < 64) { 285 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n", 286 __func__, mode->width, mode->height); 287 goto nofb; 288 } 289 if (mode->offset + mode->size > mdev_state->memsize) { 290 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n", 291 __func__); 292 goto nofb; 293 } 294 295 return 0; 296 297 nofb: 298 memset(mode, 0, sizeof(*mode)); 299 return -EINVAL; 300 } 301 302 static bool mbochs_modes_equal(struct mbochs_mode *mode1, 303 struct mbochs_mode *mode2) 304 { 305 return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0; 306 } 307 308 static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset, 309 char *buf, u32 count) 310 { 311 struct device *dev = mdev_dev(mdev_state->mdev); 312 int index = (offset - PCI_BASE_ADDRESS_0) / 0x04; 313 u32 cfg_addr; 314 315 switch (offset) { 316 case PCI_BASE_ADDRESS_0: 317 case PCI_BASE_ADDRESS_2: 318 cfg_addr = *(u32 *)buf; 319 320 if (cfg_addr == 0xffffffff) { 321 cfg_addr = (cfg_addr & mdev_state->bar_mask[index]); 322 } else { 323 cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK; 324 if (cfg_addr) 325 dev_info(dev, "BAR #%d @ 0x%x\n", 326 index, cfg_addr); 327 } 328 329 cfg_addr |= (mdev_state->vconfig[offset] & 330 ~PCI_BASE_ADDRESS_MEM_MASK); 331 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr); 332 break; 333 } 334 } 335 336 static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset, 337 char *buf, u32 count) 338 { 339 struct device *dev = mdev_dev(mdev_state->mdev); 340 int index; 341 u16 reg16; 342 343 switch (offset) { 344 case 0x400 ... 0x41f: /* vga ioports remapped */ 345 goto unhandled; 346 case 0x500 ... 0x515: /* bochs dispi interface */ 347 if (count != 2) 348 goto unhandled; 349 index = (offset - 0x500) / 2; 350 reg16 = *(u16 *)buf; 351 if (index < ARRAY_SIZE(mdev_state->vbe)) 352 mdev_state->vbe[index] = reg16; 353 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n", 354 __func__, index, reg16, vbe_name(index)); 355 break; 356 case 0x600 ... 0x607: /* qemu extended regs */ 357 goto unhandled; 358 default: 359 unhandled: 360 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", 361 __func__, offset, count); 362 break; 363 } 364 } 365 366 static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset, 367 char *buf, u32 count) 368 { 369 struct device *dev = mdev_dev(mdev_state->mdev); 370 struct vfio_region_gfx_edid *edid; 371 u16 reg16 = 0; 372 int index; 373 374 switch (offset) { 375 case 0x000 ... 0x3ff: /* edid block */ 376 edid = &mdev_state->edid_regs; 377 if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP || 378 offset >= edid->edid_size) { 379 memset(buf, 0, count); 380 break; 381 } 382 memcpy(buf, mdev_state->edid_blob + offset, count); 383 break; 384 case 0x500 ... 0x515: /* bochs dispi interface */ 385 if (count != 2) 386 goto unhandled; 387 index = (offset - 0x500) / 2; 388 if (index < ARRAY_SIZE(mdev_state->vbe)) 389 reg16 = mdev_state->vbe[index]; 390 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n", 391 __func__, index, reg16, vbe_name(index)); 392 *(u16 *)buf = reg16; 393 break; 394 default: 395 unhandled: 396 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", 397 __func__, offset, count); 398 memset(buf, 0, count); 399 break; 400 } 401 } 402 403 static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset, 404 char *buf, u32 count, bool is_write) 405 { 406 char *regs = (void *)&mdev_state->edid_regs; 407 408 if (offset + count > sizeof(mdev_state->edid_regs)) 409 return; 410 if (count != 4) 411 return; 412 if (offset % 4) 413 return; 414 415 if (is_write) { 416 switch (offset) { 417 case offsetof(struct vfio_region_gfx_edid, link_state): 418 case offsetof(struct vfio_region_gfx_edid, edid_size): 419 memcpy(regs + offset, buf, count); 420 break; 421 default: 422 /* read-only regs */ 423 break; 424 } 425 } else { 426 memcpy(buf, regs + offset, count); 427 } 428 } 429 430 static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset, 431 char *buf, u32 count, bool is_write) 432 { 433 if (offset + count > mdev_state->edid_regs.edid_max_size) 434 return; 435 if (is_write) 436 memcpy(mdev_state->edid_blob + offset, buf, count); 437 else 438 memcpy(buf, mdev_state->edid_blob + offset, count); 439 } 440 441 static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf, 442 size_t count, loff_t pos, bool is_write) 443 { 444 struct page *pg; 445 loff_t poff; 446 char *map; 447 int ret = 0; 448 449 mutex_lock(&mdev_state->ops_lock); 450 451 if (pos < MBOCHS_CONFIG_SPACE_SIZE) { 452 if (is_write) 453 handle_pci_cfg_write(mdev_state, pos, buf, count); 454 else 455 memcpy(buf, (mdev_state->vconfig + pos), count); 456 457 } else if (pos >= MBOCHS_MMIO_BAR_OFFSET && 458 pos + count <= (MBOCHS_MMIO_BAR_OFFSET + 459 MBOCHS_MMIO_BAR_SIZE)) { 460 pos -= MBOCHS_MMIO_BAR_OFFSET; 461 if (is_write) 462 handle_mmio_write(mdev_state, pos, buf, count); 463 else 464 handle_mmio_read(mdev_state, pos, buf, count); 465 466 } else if (pos >= MBOCHS_EDID_OFFSET && 467 pos + count <= (MBOCHS_EDID_OFFSET + 468 MBOCHS_EDID_SIZE)) { 469 pos -= MBOCHS_EDID_OFFSET; 470 if (pos < MBOCHS_EDID_BLOB_OFFSET) { 471 handle_edid_regs(mdev_state, pos, buf, count, is_write); 472 } else { 473 pos -= MBOCHS_EDID_BLOB_OFFSET; 474 handle_edid_blob(mdev_state, pos, buf, count, is_write); 475 } 476 477 } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET && 478 pos + count <= 479 MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) { 480 pos -= MBOCHS_MMIO_BAR_OFFSET; 481 poff = pos & ~PAGE_MASK; 482 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT); 483 map = kmap(pg); 484 if (is_write) 485 memcpy(map + poff, buf, count); 486 else 487 memcpy(buf, map + poff, count); 488 kunmap(pg); 489 put_page(pg); 490 491 } else { 492 dev_dbg(mdev_state->vdev.dev, "%s: %s @0x%llx (unhandled)\n", 493 __func__, is_write ? "WR" : "RD", pos); 494 ret = -1; 495 goto accessfailed; 496 } 497 498 ret = count; 499 500 501 accessfailed: 502 mutex_unlock(&mdev_state->ops_lock); 503 504 return ret; 505 } 506 507 static int mbochs_reset(struct mdev_state *mdev_state) 508 { 509 u32 size64k = mdev_state->memsize / (64 * 1024); 510 int i; 511 512 for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++) 513 mdev_state->vbe[i] = 0; 514 mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5; 515 mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k; 516 return 0; 517 } 518 519 static int mbochs_init_dev(struct vfio_device *vdev) 520 { 521 struct mdev_state *mdev_state = 522 container_of(vdev, struct mdev_state, vdev); 523 struct mdev_device *mdev = to_mdev_device(vdev->dev); 524 struct mbochs_type *type = 525 container_of(mdev->type, struct mbochs_type, type); 526 int avail_mbytes = atomic_read(&mbochs_avail_mbytes); 527 int ret = -ENOMEM; 528 529 do { 530 if (avail_mbytes < type->mbytes) 531 return -ENOSPC; 532 } while (!atomic_try_cmpxchg(&mbochs_avail_mbytes, &avail_mbytes, 533 avail_mbytes - type->mbytes)); 534 535 mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL); 536 if (!mdev_state->vconfig) 537 goto err_avail; 538 539 mdev_state->memsize = type->mbytes * 1024 * 1024; 540 mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT; 541 mdev_state->pages = kcalloc(mdev_state->pagecount, 542 sizeof(struct page *), 543 GFP_KERNEL); 544 if (!mdev_state->pages) 545 goto err_vconfig; 546 547 mutex_init(&mdev_state->ops_lock); 548 mdev_state->mdev = mdev; 549 INIT_LIST_HEAD(&mdev_state->dmabufs); 550 mdev_state->next_id = 1; 551 552 mdev_state->type = type; 553 mdev_state->edid_regs.max_xres = type->max_x; 554 mdev_state->edid_regs.max_yres = type->max_y; 555 mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET; 556 mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob); 557 mbochs_create_config_space(mdev_state); 558 mbochs_reset(mdev_state); 559 560 dev_info(vdev->dev, "%s: %s, %d MB, %ld pages\n", __func__, 561 type->type.pretty_name, type->mbytes, mdev_state->pagecount); 562 return 0; 563 564 err_vconfig: 565 kfree(mdev_state->vconfig); 566 err_avail: 567 atomic_add(type->mbytes, &mbochs_avail_mbytes); 568 return ret; 569 } 570 571 static int mbochs_probe(struct mdev_device *mdev) 572 { 573 struct mdev_state *mdev_state; 574 int ret = -ENOMEM; 575 576 mdev_state = vfio_alloc_device(mdev_state, vdev, &mdev->dev, 577 &mbochs_dev_ops); 578 if (IS_ERR(mdev_state)) 579 return PTR_ERR(mdev_state); 580 581 ret = vfio_register_emulated_iommu_dev(&mdev_state->vdev); 582 if (ret) 583 goto err_put_vdev; 584 dev_set_drvdata(&mdev->dev, mdev_state); 585 return 0; 586 587 err_put_vdev: 588 vfio_put_device(&mdev_state->vdev); 589 return ret; 590 } 591 592 static void mbochs_release_dev(struct vfio_device *vdev) 593 { 594 struct mdev_state *mdev_state = 595 container_of(vdev, struct mdev_state, vdev); 596 597 atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes); 598 kfree(mdev_state->pages); 599 kfree(mdev_state->vconfig); 600 } 601 602 static void mbochs_remove(struct mdev_device *mdev) 603 { 604 struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev); 605 606 vfio_unregister_group_dev(&mdev_state->vdev); 607 vfio_put_device(&mdev_state->vdev); 608 } 609 610 static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf, 611 size_t count, loff_t *ppos) 612 { 613 struct mdev_state *mdev_state = 614 container_of(vdev, struct mdev_state, vdev); 615 unsigned int done = 0; 616 int ret; 617 618 while (count) { 619 size_t filled; 620 621 if (count >= 4 && !(*ppos % 4)) { 622 u32 val; 623 624 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 625 *ppos, false); 626 if (ret <= 0) 627 goto read_err; 628 629 if (copy_to_user(buf, &val, sizeof(val))) 630 goto read_err; 631 632 filled = 4; 633 } else if (count >= 2 && !(*ppos % 2)) { 634 u16 val; 635 636 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 637 *ppos, false); 638 if (ret <= 0) 639 goto read_err; 640 641 if (copy_to_user(buf, &val, sizeof(val))) 642 goto read_err; 643 644 filled = 2; 645 } else { 646 u8 val; 647 648 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 649 *ppos, false); 650 if (ret <= 0) 651 goto read_err; 652 653 if (copy_to_user(buf, &val, sizeof(val))) 654 goto read_err; 655 656 filled = 1; 657 } 658 659 count -= filled; 660 done += filled; 661 *ppos += filled; 662 buf += filled; 663 } 664 665 return done; 666 667 read_err: 668 return -EFAULT; 669 } 670 671 static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf, 672 size_t count, loff_t *ppos) 673 { 674 struct mdev_state *mdev_state = 675 container_of(vdev, struct mdev_state, vdev); 676 unsigned int done = 0; 677 int ret; 678 679 while (count) { 680 size_t filled; 681 682 if (count >= 4 && !(*ppos % 4)) { 683 u32 val; 684 685 if (copy_from_user(&val, buf, sizeof(val))) 686 goto write_err; 687 688 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 689 *ppos, true); 690 if (ret <= 0) 691 goto write_err; 692 693 filled = 4; 694 } else if (count >= 2 && !(*ppos % 2)) { 695 u16 val; 696 697 if (copy_from_user(&val, buf, sizeof(val))) 698 goto write_err; 699 700 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 701 *ppos, true); 702 if (ret <= 0) 703 goto write_err; 704 705 filled = 2; 706 } else { 707 u8 val; 708 709 if (copy_from_user(&val, buf, sizeof(val))) 710 goto write_err; 711 712 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 713 *ppos, true); 714 if (ret <= 0) 715 goto write_err; 716 717 filled = 1; 718 } 719 count -= filled; 720 done += filled; 721 *ppos += filled; 722 buf += filled; 723 } 724 725 return done; 726 write_err: 727 return -EFAULT; 728 } 729 730 static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 731 pgoff_t pgoff) 732 { 733 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 734 735 if (!mdev_state->pages[pgoff]) { 736 mdev_state->pages[pgoff] = 737 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0); 738 if (!mdev_state->pages[pgoff]) 739 return NULL; 740 } 741 742 get_page(mdev_state->pages[pgoff]); 743 return mdev_state->pages[pgoff]; 744 } 745 746 static struct page *mbochs_get_page(struct mdev_state *mdev_state, 747 pgoff_t pgoff) 748 { 749 struct page *page; 750 751 if (WARN_ON(pgoff >= mdev_state->pagecount)) 752 return NULL; 753 754 mutex_lock(&mdev_state->ops_lock); 755 page = __mbochs_get_page(mdev_state, pgoff); 756 mutex_unlock(&mdev_state->ops_lock); 757 758 return page; 759 } 760 761 static void mbochs_put_pages(struct mdev_state *mdev_state) 762 { 763 struct device *dev = mdev_dev(mdev_state->mdev); 764 int i, count = 0; 765 766 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 767 768 for (i = 0; i < mdev_state->pagecount; i++) { 769 if (!mdev_state->pages[i]) 770 continue; 771 put_page(mdev_state->pages[i]); 772 mdev_state->pages[i] = NULL; 773 count++; 774 } 775 dev_dbg(dev, "%s: %d pages released\n", __func__, count); 776 } 777 778 static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf) 779 { 780 struct vm_area_struct *vma = vmf->vma; 781 struct mdev_state *mdev_state = vma->vm_private_data; 782 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 783 784 if (page_offset >= mdev_state->pagecount) 785 return VM_FAULT_SIGBUS; 786 787 vmf->page = mbochs_get_page(mdev_state, page_offset); 788 if (!vmf->page) 789 return VM_FAULT_SIGBUS; 790 791 return 0; 792 } 793 794 static const struct vm_operations_struct mbochs_region_vm_ops = { 795 .fault = mbochs_region_vm_fault, 796 }; 797 798 static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma) 799 { 800 struct mdev_state *mdev_state = 801 container_of(vdev, struct mdev_state, vdev); 802 803 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT) 804 return -EINVAL; 805 if (vma->vm_end < vma->vm_start) 806 return -EINVAL; 807 if (vma->vm_end - vma->vm_start > mdev_state->memsize) 808 return -EINVAL; 809 if ((vma->vm_flags & VM_SHARED) == 0) 810 return -EINVAL; 811 812 vma->vm_ops = &mbochs_region_vm_ops; 813 vma->vm_private_data = mdev_state; 814 return 0; 815 } 816 817 static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf) 818 { 819 struct vm_area_struct *vma = vmf->vma; 820 struct mbochs_dmabuf *dmabuf = vma->vm_private_data; 821 822 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount)) 823 return VM_FAULT_SIGBUS; 824 825 vmf->page = dmabuf->pages[vmf->pgoff]; 826 get_page(vmf->page); 827 return 0; 828 } 829 830 static const struct vm_operations_struct mbochs_dmabuf_vm_ops = { 831 .fault = mbochs_dmabuf_vm_fault, 832 }; 833 834 static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma) 835 { 836 struct mbochs_dmabuf *dmabuf = buf->priv; 837 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 838 839 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 840 841 if ((vma->vm_flags & VM_SHARED) == 0) 842 return -EINVAL; 843 844 vma->vm_ops = &mbochs_dmabuf_vm_ops; 845 vma->vm_private_data = dmabuf; 846 return 0; 847 } 848 849 static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf, 850 const char *prefix) 851 { 852 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 853 u32 fourcc = dmabuf->mode.drm_format; 854 855 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n", 856 prefix, dmabuf->id, 857 fourcc ? ((fourcc >> 0) & 0xff) : '-', 858 fourcc ? ((fourcc >> 8) & 0xff) : '-', 859 fourcc ? ((fourcc >> 16) & 0xff) : '-', 860 fourcc ? ((fourcc >> 24) & 0xff) : '-', 861 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride, 862 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount); 863 } 864 865 static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at, 866 enum dma_data_direction direction) 867 { 868 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 869 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 870 struct sg_table *sg; 871 872 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 873 874 sg = kzalloc(sizeof(*sg), GFP_KERNEL); 875 if (!sg) 876 goto err1; 877 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount, 878 0, dmabuf->mode.size, GFP_KERNEL) < 0) 879 goto err2; 880 if (dma_map_sgtable(at->dev, sg, direction, 0)) 881 goto err3; 882 883 return sg; 884 885 err3: 886 sg_free_table(sg); 887 err2: 888 kfree(sg); 889 err1: 890 return ERR_PTR(-ENOMEM); 891 } 892 893 static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at, 894 struct sg_table *sg, 895 enum dma_data_direction direction) 896 { 897 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 898 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 899 900 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 901 902 dma_unmap_sgtable(at->dev, sg, direction, 0); 903 sg_free_table(sg); 904 kfree(sg); 905 } 906 907 static void mbochs_release_dmabuf(struct dma_buf *buf) 908 { 909 struct mbochs_dmabuf *dmabuf = buf->priv; 910 struct mdev_state *mdev_state = dmabuf->mdev_state; 911 struct device *dev = mdev_dev(mdev_state->mdev); 912 pgoff_t pg; 913 914 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 915 916 for (pg = 0; pg < dmabuf->pagecount; pg++) 917 put_page(dmabuf->pages[pg]); 918 919 mutex_lock(&mdev_state->ops_lock); 920 dmabuf->buf = NULL; 921 if (dmabuf->unlinked) 922 kfree(dmabuf); 923 mutex_unlock(&mdev_state->ops_lock); 924 } 925 926 static struct dma_buf_ops mbochs_dmabuf_ops = { 927 .map_dma_buf = mbochs_map_dmabuf, 928 .unmap_dma_buf = mbochs_unmap_dmabuf, 929 .release = mbochs_release_dmabuf, 930 .mmap = mbochs_mmap_dmabuf, 931 }; 932 933 static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state, 934 struct mbochs_mode *mode) 935 { 936 struct mbochs_dmabuf *dmabuf; 937 pgoff_t page_offset, pg; 938 939 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 940 941 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL); 942 if (!dmabuf) 943 return NULL; 944 945 dmabuf->mode = *mode; 946 dmabuf->id = mdev_state->next_id++; 947 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE); 948 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *), 949 GFP_KERNEL); 950 if (!dmabuf->pages) 951 goto err_free_dmabuf; 952 953 page_offset = dmabuf->mode.offset >> PAGE_SHIFT; 954 for (pg = 0; pg < dmabuf->pagecount; pg++) { 955 dmabuf->pages[pg] = __mbochs_get_page(mdev_state, 956 page_offset + pg); 957 if (!dmabuf->pages[pg]) 958 goto err_free_pages; 959 } 960 961 dmabuf->mdev_state = mdev_state; 962 list_add(&dmabuf->next, &mdev_state->dmabufs); 963 964 mbochs_print_dmabuf(dmabuf, __func__); 965 return dmabuf; 966 967 err_free_pages: 968 while (pg > 0) 969 put_page(dmabuf->pages[--pg]); 970 kfree(dmabuf->pages); 971 err_free_dmabuf: 972 kfree(dmabuf); 973 return NULL; 974 } 975 976 static struct mbochs_dmabuf * 977 mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state, 978 struct mbochs_mode *mode) 979 { 980 struct mbochs_dmabuf *dmabuf; 981 982 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 983 984 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 985 if (mbochs_modes_equal(&dmabuf->mode, mode)) 986 return dmabuf; 987 988 return NULL; 989 } 990 991 static struct mbochs_dmabuf * 992 mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id) 993 { 994 struct mbochs_dmabuf *dmabuf; 995 996 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 997 998 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 999 if (dmabuf->id == id) 1000 return dmabuf; 1001 1002 return NULL; 1003 } 1004 1005 static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf) 1006 { 1007 struct mdev_state *mdev_state = dmabuf->mdev_state; 1008 struct device *dev = mdev_state->vdev.dev; 1009 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 1010 struct dma_buf *buf; 1011 1012 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 1013 1014 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) { 1015 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n", 1016 __func__); 1017 return -EINVAL; 1018 } 1019 1020 exp_info.ops = &mbochs_dmabuf_ops; 1021 exp_info.size = dmabuf->mode.size; 1022 exp_info.priv = dmabuf; 1023 1024 buf = dma_buf_export(&exp_info); 1025 if (IS_ERR(buf)) { 1026 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n", 1027 __func__, PTR_ERR(buf)); 1028 return PTR_ERR(buf); 1029 } 1030 1031 dmabuf->buf = buf; 1032 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 1033 return 0; 1034 } 1035 1036 static int mbochs_get_region_info(struct mdev_state *mdev_state, 1037 struct vfio_region_info_ext *ext) 1038 { 1039 struct vfio_region_info *region_info = &ext->base; 1040 1041 if (region_info->index >= MBOCHS_NUM_REGIONS) 1042 return -EINVAL; 1043 1044 switch (region_info->index) { 1045 case VFIO_PCI_CONFIG_REGION_INDEX: 1046 region_info->offset = 0; 1047 region_info->size = MBOCHS_CONFIG_SPACE_SIZE; 1048 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1049 VFIO_REGION_INFO_FLAG_WRITE); 1050 break; 1051 case VFIO_PCI_BAR0_REGION_INDEX: 1052 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET; 1053 region_info->size = mdev_state->memsize; 1054 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1055 VFIO_REGION_INFO_FLAG_WRITE | 1056 VFIO_REGION_INFO_FLAG_MMAP); 1057 break; 1058 case VFIO_PCI_BAR2_REGION_INDEX: 1059 region_info->offset = MBOCHS_MMIO_BAR_OFFSET; 1060 region_info->size = MBOCHS_MMIO_BAR_SIZE; 1061 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1062 VFIO_REGION_INFO_FLAG_WRITE); 1063 break; 1064 case MBOCHS_EDID_REGION_INDEX: 1065 ext->base.argsz = sizeof(*ext); 1066 ext->base.offset = MBOCHS_EDID_OFFSET; 1067 ext->base.size = MBOCHS_EDID_SIZE; 1068 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ | 1069 VFIO_REGION_INFO_FLAG_WRITE | 1070 VFIO_REGION_INFO_FLAG_CAPS); 1071 ext->base.cap_offset = offsetof(typeof(*ext), type); 1072 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE; 1073 ext->type.header.version = 1; 1074 ext->type.header.next = 0; 1075 ext->type.type = VFIO_REGION_TYPE_GFX; 1076 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID; 1077 break; 1078 default: 1079 region_info->size = 0; 1080 region_info->offset = 0; 1081 region_info->flags = 0; 1082 } 1083 1084 return 0; 1085 } 1086 1087 static int mbochs_get_irq_info(struct vfio_irq_info *irq_info) 1088 { 1089 irq_info->count = 0; 1090 return 0; 1091 } 1092 1093 static int mbochs_get_device_info(struct vfio_device_info *dev_info) 1094 { 1095 dev_info->flags = VFIO_DEVICE_FLAGS_PCI; 1096 dev_info->num_regions = MBOCHS_NUM_REGIONS; 1097 dev_info->num_irqs = VFIO_PCI_NUM_IRQS; 1098 return 0; 1099 } 1100 1101 static int mbochs_query_gfx_plane(struct mdev_state *mdev_state, 1102 struct vfio_device_gfx_plane_info *plane) 1103 { 1104 struct mbochs_dmabuf *dmabuf; 1105 struct mbochs_mode mode; 1106 int ret; 1107 1108 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) { 1109 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE | 1110 VFIO_GFX_PLANE_TYPE_DMABUF)) 1111 return 0; 1112 return -EINVAL; 1113 } 1114 1115 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF) 1116 return -EINVAL; 1117 1118 plane->drm_format_mod = 0; 1119 plane->x_pos = 0; 1120 plane->y_pos = 0; 1121 plane->x_hot = 0; 1122 plane->y_hot = 0; 1123 1124 mutex_lock(&mdev_state->ops_lock); 1125 1126 ret = -EINVAL; 1127 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY) 1128 ret = mbochs_check_framebuffer(mdev_state, &mode); 1129 if (ret < 0) { 1130 plane->drm_format = 0; 1131 plane->width = 0; 1132 plane->height = 0; 1133 plane->stride = 0; 1134 plane->size = 0; 1135 plane->dmabuf_id = 0; 1136 goto done; 1137 } 1138 1139 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode); 1140 if (!dmabuf) 1141 mbochs_dmabuf_alloc(mdev_state, &mode); 1142 if (!dmabuf) { 1143 mutex_unlock(&mdev_state->ops_lock); 1144 return -ENOMEM; 1145 } 1146 1147 plane->drm_format = dmabuf->mode.drm_format; 1148 plane->width = dmabuf->mode.width; 1149 plane->height = dmabuf->mode.height; 1150 plane->stride = dmabuf->mode.stride; 1151 plane->size = dmabuf->mode.size; 1152 plane->dmabuf_id = dmabuf->id; 1153 1154 done: 1155 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY && 1156 mdev_state->active_id != plane->dmabuf_id) { 1157 dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n", 1158 __func__, mdev_state->active_id, plane->dmabuf_id); 1159 mdev_state->active_id = plane->dmabuf_id; 1160 } 1161 mutex_unlock(&mdev_state->ops_lock); 1162 return 0; 1163 } 1164 1165 static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id) 1166 { 1167 struct mbochs_dmabuf *dmabuf; 1168 1169 mutex_lock(&mdev_state->ops_lock); 1170 1171 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id); 1172 if (!dmabuf) { 1173 mutex_unlock(&mdev_state->ops_lock); 1174 return -ENOENT; 1175 } 1176 1177 if (!dmabuf->buf) 1178 mbochs_dmabuf_export(dmabuf); 1179 1180 mutex_unlock(&mdev_state->ops_lock); 1181 1182 if (!dmabuf->buf) 1183 return -EINVAL; 1184 1185 return dma_buf_fd(dmabuf->buf, 0); 1186 } 1187 1188 static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd, 1189 unsigned long arg) 1190 { 1191 struct mdev_state *mdev_state = 1192 container_of(vdev, struct mdev_state, vdev); 1193 int ret = 0; 1194 unsigned long minsz, outsz; 1195 1196 switch (cmd) { 1197 case VFIO_DEVICE_GET_INFO: 1198 { 1199 struct vfio_device_info info; 1200 1201 minsz = offsetofend(struct vfio_device_info, num_irqs); 1202 1203 if (copy_from_user(&info, (void __user *)arg, minsz)) 1204 return -EFAULT; 1205 1206 if (info.argsz < minsz) 1207 return -EINVAL; 1208 1209 ret = mbochs_get_device_info(&info); 1210 if (ret) 1211 return ret; 1212 1213 if (copy_to_user((void __user *)arg, &info, minsz)) 1214 return -EFAULT; 1215 1216 return 0; 1217 } 1218 case VFIO_DEVICE_GET_REGION_INFO: 1219 { 1220 struct vfio_region_info_ext info; 1221 1222 minsz = offsetofend(typeof(info), base.offset); 1223 1224 if (copy_from_user(&info, (void __user *)arg, minsz)) 1225 return -EFAULT; 1226 1227 outsz = info.base.argsz; 1228 if (outsz < minsz) 1229 return -EINVAL; 1230 if (outsz > sizeof(info)) 1231 return -EINVAL; 1232 1233 ret = mbochs_get_region_info(mdev_state, &info); 1234 if (ret) 1235 return ret; 1236 1237 if (copy_to_user((void __user *)arg, &info, outsz)) 1238 return -EFAULT; 1239 1240 return 0; 1241 } 1242 1243 case VFIO_DEVICE_GET_IRQ_INFO: 1244 { 1245 struct vfio_irq_info info; 1246 1247 minsz = offsetofend(struct vfio_irq_info, count); 1248 1249 if (copy_from_user(&info, (void __user *)arg, minsz)) 1250 return -EFAULT; 1251 1252 if ((info.argsz < minsz) || 1253 (info.index >= VFIO_PCI_NUM_IRQS)) 1254 return -EINVAL; 1255 1256 ret = mbochs_get_irq_info(&info); 1257 if (ret) 1258 return ret; 1259 1260 if (copy_to_user((void __user *)arg, &info, minsz)) 1261 return -EFAULT; 1262 1263 return 0; 1264 } 1265 1266 case VFIO_DEVICE_QUERY_GFX_PLANE: 1267 { 1268 struct vfio_device_gfx_plane_info plane = {}; 1269 1270 minsz = offsetofend(struct vfio_device_gfx_plane_info, 1271 region_index); 1272 1273 if (copy_from_user(&plane, (void __user *)arg, minsz)) 1274 return -EFAULT; 1275 1276 if (plane.argsz < minsz) 1277 return -EINVAL; 1278 1279 ret = mbochs_query_gfx_plane(mdev_state, &plane); 1280 if (ret) 1281 return ret; 1282 1283 if (copy_to_user((void __user *)arg, &plane, minsz)) 1284 return -EFAULT; 1285 1286 return 0; 1287 } 1288 1289 case VFIO_DEVICE_GET_GFX_DMABUF: 1290 { 1291 u32 dmabuf_id; 1292 1293 if (get_user(dmabuf_id, (__u32 __user *)arg)) 1294 return -EFAULT; 1295 1296 return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id); 1297 } 1298 1299 case VFIO_DEVICE_SET_IRQS: 1300 return -EINVAL; 1301 1302 case VFIO_DEVICE_RESET: 1303 return mbochs_reset(mdev_state); 1304 } 1305 return -ENOTTY; 1306 } 1307 1308 static void mbochs_close_device(struct vfio_device *vdev) 1309 { 1310 struct mdev_state *mdev_state = 1311 container_of(vdev, struct mdev_state, vdev); 1312 struct mbochs_dmabuf *dmabuf, *tmp; 1313 1314 mutex_lock(&mdev_state->ops_lock); 1315 1316 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) { 1317 list_del(&dmabuf->next); 1318 if (dmabuf->buf) { 1319 /* free in mbochs_release_dmabuf() */ 1320 dmabuf->unlinked = true; 1321 } else { 1322 kfree(dmabuf); 1323 } 1324 } 1325 mbochs_put_pages(mdev_state); 1326 1327 mutex_unlock(&mdev_state->ops_lock); 1328 } 1329 1330 static ssize_t 1331 memory_show(struct device *dev, struct device_attribute *attr, 1332 char *buf) 1333 { 1334 struct mdev_state *mdev_state = dev_get_drvdata(dev); 1335 1336 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes); 1337 } 1338 static DEVICE_ATTR_RO(memory); 1339 1340 static struct attribute *mdev_dev_attrs[] = { 1341 &dev_attr_memory.attr, 1342 NULL, 1343 }; 1344 1345 static const struct attribute_group mdev_dev_group = { 1346 .name = "vendor", 1347 .attrs = mdev_dev_attrs, 1348 }; 1349 1350 static const struct attribute_group *mdev_dev_groups[] = { 1351 &mdev_dev_group, 1352 NULL, 1353 }; 1354 1355 static ssize_t mbochs_show_description(struct mdev_type *mtype, char *buf) 1356 { 1357 struct mbochs_type *type = 1358 container_of(mtype, struct mbochs_type, type); 1359 1360 return sprintf(buf, "virtual display, %d MB video memory\n", 1361 type ? type->mbytes : 0); 1362 } 1363 1364 static unsigned int mbochs_get_available(struct mdev_type *mtype) 1365 { 1366 struct mbochs_type *type = 1367 container_of(mtype, struct mbochs_type, type); 1368 1369 return atomic_read(&mbochs_avail_mbytes) / type->mbytes; 1370 } 1371 1372 static const struct vfio_device_ops mbochs_dev_ops = { 1373 .close_device = mbochs_close_device, 1374 .init = mbochs_init_dev, 1375 .release = mbochs_release_dev, 1376 .read = mbochs_read, 1377 .write = mbochs_write, 1378 .ioctl = mbochs_ioctl, 1379 .mmap = mbochs_mmap, 1380 .bind_iommufd = vfio_iommufd_emulated_bind, 1381 .unbind_iommufd = vfio_iommufd_emulated_unbind, 1382 .attach_ioas = vfio_iommufd_emulated_attach_ioas, 1383 .detach_ioas = vfio_iommufd_emulated_detach_ioas, 1384 }; 1385 1386 static struct mdev_driver mbochs_driver = { 1387 .device_api = VFIO_DEVICE_API_PCI_STRING, 1388 .driver = { 1389 .name = "mbochs", 1390 .owner = THIS_MODULE, 1391 .mod_name = KBUILD_MODNAME, 1392 .dev_groups = mdev_dev_groups, 1393 }, 1394 .probe = mbochs_probe, 1395 .remove = mbochs_remove, 1396 .get_available = mbochs_get_available, 1397 .show_description = mbochs_show_description, 1398 }; 1399 1400 static const struct file_operations vd_fops = { 1401 .owner = THIS_MODULE, 1402 }; 1403 1404 static void mbochs_device_release(struct device *dev) 1405 { 1406 /* nothing */ 1407 } 1408 1409 static int __init mbochs_dev_init(void) 1410 { 1411 int ret = 0; 1412 1413 atomic_set(&mbochs_avail_mbytes, max_mbytes); 1414 1415 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME); 1416 if (ret < 0) { 1417 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret); 1418 return ret; 1419 } 1420 cdev_init(&mbochs_cdev, &vd_fops); 1421 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1); 1422 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt)); 1423 1424 ret = mdev_register_driver(&mbochs_driver); 1425 if (ret) 1426 goto err_cdev; 1427 1428 ret = class_register(&mbochs_class); 1429 if (ret) 1430 goto err_driver; 1431 mbochs_dev.class = &mbochs_class; 1432 mbochs_dev.release = mbochs_device_release; 1433 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME); 1434 1435 ret = device_register(&mbochs_dev); 1436 if (ret) 1437 goto err_put; 1438 1439 ret = mdev_register_parent(&mbochs_parent, &mbochs_dev, &mbochs_driver, 1440 mbochs_mdev_types, 1441 ARRAY_SIZE(mbochs_mdev_types)); 1442 if (ret) 1443 goto err_device; 1444 1445 return 0; 1446 1447 err_device: 1448 device_del(&mbochs_dev); 1449 err_put: 1450 put_device(&mbochs_dev); 1451 class_unregister(&mbochs_class); 1452 err_driver: 1453 mdev_unregister_driver(&mbochs_driver); 1454 err_cdev: 1455 cdev_del(&mbochs_cdev); 1456 unregister_chrdev_region(mbochs_devt, MINORMASK + 1); 1457 return ret; 1458 } 1459 1460 static void __exit mbochs_dev_exit(void) 1461 { 1462 mbochs_dev.bus = NULL; 1463 mdev_unregister_parent(&mbochs_parent); 1464 1465 device_unregister(&mbochs_dev); 1466 mdev_unregister_driver(&mbochs_driver); 1467 cdev_del(&mbochs_cdev); 1468 unregister_chrdev_region(mbochs_devt, MINORMASK + 1); 1469 class_unregister(&mbochs_class); 1470 } 1471 1472 MODULE_IMPORT_NS(DMA_BUF); 1473 module_init(mbochs_dev_init) 1474 module_exit(mbochs_dev_exit) 1475