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 mbochs_mode { 147 u32 drm_format; 148 u32 bytepp; 149 u32 width; 150 u32 height; 151 u32 stride; 152 u32 __pad; 153 u64 offset; 154 u64 size; 155 }; 156 157 struct mbochs_dmabuf { 158 struct mbochs_mode mode; 159 u32 id; 160 struct page **pages; 161 pgoff_t pagecount; 162 struct dma_buf *buf; 163 struct mdev_state *mdev_state; 164 struct list_head next; 165 bool unlinked; 166 }; 167 168 /* State of each mdev device */ 169 struct mdev_state { 170 struct vfio_device vdev; 171 u8 *vconfig; 172 u64 bar_mask[3]; 173 u32 memory_bar_mask; 174 struct mutex ops_lock; 175 struct mdev_device *mdev; 176 177 const struct mbochs_type *type; 178 u16 vbe[VBE_DISPI_INDEX_COUNT]; 179 u64 memsize; 180 struct page **pages; 181 pgoff_t pagecount; 182 struct vfio_region_gfx_edid edid_regs; 183 u8 edid_blob[0x400]; 184 185 struct list_head dmabufs; 186 u32 active_id; 187 u32 next_id; 188 }; 189 190 static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = { 191 [VBE_DISPI_INDEX_ID] = "id", 192 [VBE_DISPI_INDEX_XRES] = "xres", 193 [VBE_DISPI_INDEX_YRES] = "yres", 194 [VBE_DISPI_INDEX_BPP] = "bpp", 195 [VBE_DISPI_INDEX_ENABLE] = "enable", 196 [VBE_DISPI_INDEX_BANK] = "bank", 197 [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width", 198 [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height", 199 [VBE_DISPI_INDEX_X_OFFSET] = "x-offset", 200 [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset", 201 [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem", 202 }; 203 204 static const char *vbe_name(u32 index) 205 { 206 if (index < ARRAY_SIZE(vbe_name_list)) 207 return vbe_name_list[index]; 208 return "(invalid)"; 209 } 210 211 static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 212 pgoff_t pgoff); 213 static struct page *mbochs_get_page(struct mdev_state *mdev_state, 214 pgoff_t pgoff); 215 216 static void mbochs_create_config_space(struct mdev_state *mdev_state) 217 { 218 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID], 219 0x1234); 220 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID], 221 0x1111); 222 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID], 223 PCI_SUBVENDOR_ID_REDHAT_QUMRANET); 224 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID], 225 PCI_SUBDEVICE_ID_QEMU); 226 227 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND], 228 PCI_COMMAND_IO | PCI_COMMAND_MEMORY); 229 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE], 230 PCI_CLASS_DISPLAY_OTHER); 231 mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01; 232 233 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0], 234 PCI_BASE_ADDRESS_SPACE_MEMORY | 235 PCI_BASE_ADDRESS_MEM_TYPE_32 | 236 PCI_BASE_ADDRESS_MEM_PREFETCH); 237 mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1; 238 239 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2], 240 PCI_BASE_ADDRESS_SPACE_MEMORY | 241 PCI_BASE_ADDRESS_MEM_TYPE_32); 242 mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1; 243 } 244 245 static int mbochs_check_framebuffer(struct mdev_state *mdev_state, 246 struct mbochs_mode *mode) 247 { 248 struct device *dev = mdev_dev(mdev_state->mdev); 249 u16 *vbe = mdev_state->vbe; 250 u32 virt_width; 251 252 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 253 254 if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) 255 goto nofb; 256 257 memset(mode, 0, sizeof(*mode)); 258 switch (vbe[VBE_DISPI_INDEX_BPP]) { 259 case 32: 260 mode->drm_format = DRM_FORMAT_XRGB8888; 261 mode->bytepp = 4; 262 break; 263 default: 264 dev_info_ratelimited(dev, "%s: bpp %d not supported\n", 265 __func__, vbe[VBE_DISPI_INDEX_BPP]); 266 goto nofb; 267 } 268 269 mode->width = vbe[VBE_DISPI_INDEX_XRES]; 270 mode->height = vbe[VBE_DISPI_INDEX_YRES]; 271 virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH]; 272 if (virt_width < mode->width) 273 virt_width = mode->width; 274 mode->stride = virt_width * mode->bytepp; 275 mode->size = (u64)mode->stride * mode->height; 276 mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp + 277 (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride); 278 279 if (mode->width < 64 || mode->height < 64) { 280 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n", 281 __func__, mode->width, mode->height); 282 goto nofb; 283 } 284 if (mode->offset + mode->size > mdev_state->memsize) { 285 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n", 286 __func__); 287 goto nofb; 288 } 289 290 return 0; 291 292 nofb: 293 memset(mode, 0, sizeof(*mode)); 294 return -EINVAL; 295 } 296 297 static bool mbochs_modes_equal(struct mbochs_mode *mode1, 298 struct mbochs_mode *mode2) 299 { 300 return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0; 301 } 302 303 static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset, 304 char *buf, u32 count) 305 { 306 struct device *dev = mdev_dev(mdev_state->mdev); 307 int index = (offset - PCI_BASE_ADDRESS_0) / 0x04; 308 u32 cfg_addr; 309 310 switch (offset) { 311 case PCI_BASE_ADDRESS_0: 312 case PCI_BASE_ADDRESS_2: 313 cfg_addr = *(u32 *)buf; 314 315 if (cfg_addr == 0xffffffff) { 316 cfg_addr = (cfg_addr & mdev_state->bar_mask[index]); 317 } else { 318 cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK; 319 if (cfg_addr) 320 dev_info(dev, "BAR #%d @ 0x%x\n", 321 index, cfg_addr); 322 } 323 324 cfg_addr |= (mdev_state->vconfig[offset] & 325 ~PCI_BASE_ADDRESS_MEM_MASK); 326 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr); 327 break; 328 } 329 } 330 331 static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset, 332 char *buf, u32 count) 333 { 334 struct device *dev = mdev_dev(mdev_state->mdev); 335 int index; 336 u16 reg16; 337 338 switch (offset) { 339 case 0x400 ... 0x41f: /* vga ioports remapped */ 340 goto unhandled; 341 case 0x500 ... 0x515: /* bochs dispi interface */ 342 if (count != 2) 343 goto unhandled; 344 index = (offset - 0x500) / 2; 345 reg16 = *(u16 *)buf; 346 if (index < ARRAY_SIZE(mdev_state->vbe)) 347 mdev_state->vbe[index] = reg16; 348 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n", 349 __func__, index, reg16, vbe_name(index)); 350 break; 351 case 0x600 ... 0x607: /* qemu extended regs */ 352 goto unhandled; 353 default: 354 unhandled: 355 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", 356 __func__, offset, count); 357 break; 358 } 359 } 360 361 static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset, 362 char *buf, u32 count) 363 { 364 struct device *dev = mdev_dev(mdev_state->mdev); 365 struct vfio_region_gfx_edid *edid; 366 u16 reg16 = 0; 367 int index; 368 369 switch (offset) { 370 case 0x000 ... 0x3ff: /* edid block */ 371 edid = &mdev_state->edid_regs; 372 if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP || 373 offset >= edid->edid_size) { 374 memset(buf, 0, count); 375 break; 376 } 377 memcpy(buf, mdev_state->edid_blob + offset, count); 378 break; 379 case 0x500 ... 0x515: /* bochs dispi interface */ 380 if (count != 2) 381 goto unhandled; 382 index = (offset - 0x500) / 2; 383 if (index < ARRAY_SIZE(mdev_state->vbe)) 384 reg16 = mdev_state->vbe[index]; 385 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n", 386 __func__, index, reg16, vbe_name(index)); 387 *(u16 *)buf = reg16; 388 break; 389 default: 390 unhandled: 391 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", 392 __func__, offset, count); 393 memset(buf, 0, count); 394 break; 395 } 396 } 397 398 static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset, 399 char *buf, u32 count, bool is_write) 400 { 401 char *regs = (void *)&mdev_state->edid_regs; 402 403 if (offset + count > sizeof(mdev_state->edid_regs)) 404 return; 405 if (count != 4) 406 return; 407 if (offset % 4) 408 return; 409 410 if (is_write) { 411 switch (offset) { 412 case offsetof(struct vfio_region_gfx_edid, link_state): 413 case offsetof(struct vfio_region_gfx_edid, edid_size): 414 memcpy(regs + offset, buf, count); 415 break; 416 default: 417 /* read-only regs */ 418 break; 419 } 420 } else { 421 memcpy(buf, regs + offset, count); 422 } 423 } 424 425 static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset, 426 char *buf, u32 count, bool is_write) 427 { 428 if (offset + count > mdev_state->edid_regs.edid_max_size) 429 return; 430 if (is_write) 431 memcpy(mdev_state->edid_blob + offset, buf, count); 432 else 433 memcpy(buf, mdev_state->edid_blob + offset, count); 434 } 435 436 static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf, 437 size_t count, loff_t pos, bool is_write) 438 { 439 struct page *pg; 440 loff_t poff; 441 char *map; 442 int ret = 0; 443 444 mutex_lock(&mdev_state->ops_lock); 445 446 if (pos < MBOCHS_CONFIG_SPACE_SIZE) { 447 if (is_write) 448 handle_pci_cfg_write(mdev_state, pos, buf, count); 449 else 450 memcpy(buf, (mdev_state->vconfig + pos), count); 451 452 } else if (pos >= MBOCHS_MMIO_BAR_OFFSET && 453 pos + count <= (MBOCHS_MMIO_BAR_OFFSET + 454 MBOCHS_MMIO_BAR_SIZE)) { 455 pos -= MBOCHS_MMIO_BAR_OFFSET; 456 if (is_write) 457 handle_mmio_write(mdev_state, pos, buf, count); 458 else 459 handle_mmio_read(mdev_state, pos, buf, count); 460 461 } else if (pos >= MBOCHS_EDID_OFFSET && 462 pos + count <= (MBOCHS_EDID_OFFSET + 463 MBOCHS_EDID_SIZE)) { 464 pos -= MBOCHS_EDID_OFFSET; 465 if (pos < MBOCHS_EDID_BLOB_OFFSET) { 466 handle_edid_regs(mdev_state, pos, buf, count, is_write); 467 } else { 468 pos -= MBOCHS_EDID_BLOB_OFFSET; 469 handle_edid_blob(mdev_state, pos, buf, count, is_write); 470 } 471 472 } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET && 473 pos + count <= 474 MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) { 475 pos -= MBOCHS_MMIO_BAR_OFFSET; 476 poff = pos & ~PAGE_MASK; 477 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT); 478 map = kmap(pg); 479 if (is_write) 480 memcpy(map + poff, buf, count); 481 else 482 memcpy(buf, map + poff, count); 483 kunmap(pg); 484 put_page(pg); 485 486 } else { 487 dev_dbg(mdev_state->vdev.dev, "%s: %s @0x%llx (unhandled)\n", 488 __func__, is_write ? "WR" : "RD", pos); 489 ret = -1; 490 goto accessfailed; 491 } 492 493 ret = count; 494 495 496 accessfailed: 497 mutex_unlock(&mdev_state->ops_lock); 498 499 return ret; 500 } 501 502 static int mbochs_reset(struct mdev_state *mdev_state) 503 { 504 u32 size64k = mdev_state->memsize / (64 * 1024); 505 int i; 506 507 for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++) 508 mdev_state->vbe[i] = 0; 509 mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5; 510 mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k; 511 return 0; 512 } 513 514 static int mbochs_init_dev(struct vfio_device *vdev) 515 { 516 struct mdev_state *mdev_state = 517 container_of(vdev, struct mdev_state, vdev); 518 struct mdev_device *mdev = to_mdev_device(vdev->dev); 519 struct mbochs_type *type = 520 container_of(mdev->type, struct mbochs_type, type); 521 int avail_mbytes = atomic_read(&mbochs_avail_mbytes); 522 int ret = -ENOMEM; 523 524 do { 525 if (avail_mbytes < type->mbytes) 526 return -ENOSPC; 527 } while (!atomic_try_cmpxchg(&mbochs_avail_mbytes, &avail_mbytes, 528 avail_mbytes - type->mbytes)); 529 530 mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL); 531 if (!mdev_state->vconfig) 532 goto err_avail; 533 534 mdev_state->memsize = type->mbytes * 1024 * 1024; 535 mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT; 536 mdev_state->pages = kcalloc(mdev_state->pagecount, 537 sizeof(struct page *), 538 GFP_KERNEL); 539 if (!mdev_state->pages) 540 goto err_vconfig; 541 542 mutex_init(&mdev_state->ops_lock); 543 mdev_state->mdev = mdev; 544 INIT_LIST_HEAD(&mdev_state->dmabufs); 545 mdev_state->next_id = 1; 546 547 mdev_state->type = type; 548 mdev_state->edid_regs.max_xres = type->max_x; 549 mdev_state->edid_regs.max_yres = type->max_y; 550 mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET; 551 mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob); 552 mbochs_create_config_space(mdev_state); 553 mbochs_reset(mdev_state); 554 555 dev_info(vdev->dev, "%s: %s, %d MB, %ld pages\n", __func__, 556 type->type.pretty_name, type->mbytes, mdev_state->pagecount); 557 return 0; 558 559 err_vconfig: 560 kfree(mdev_state->vconfig); 561 err_avail: 562 atomic_add(type->mbytes, &mbochs_avail_mbytes); 563 return ret; 564 } 565 566 static int mbochs_probe(struct mdev_device *mdev) 567 { 568 struct mdev_state *mdev_state; 569 int ret = -ENOMEM; 570 571 mdev_state = vfio_alloc_device(mdev_state, vdev, &mdev->dev, 572 &mbochs_dev_ops); 573 if (IS_ERR(mdev_state)) 574 return PTR_ERR(mdev_state); 575 576 ret = vfio_register_emulated_iommu_dev(&mdev_state->vdev); 577 if (ret) 578 goto err_put_vdev; 579 dev_set_drvdata(&mdev->dev, mdev_state); 580 return 0; 581 582 err_put_vdev: 583 vfio_put_device(&mdev_state->vdev); 584 return ret; 585 } 586 587 static void mbochs_release_dev(struct vfio_device *vdev) 588 { 589 struct mdev_state *mdev_state = 590 container_of(vdev, struct mdev_state, vdev); 591 592 atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes); 593 kfree(mdev_state->pages); 594 kfree(mdev_state->vconfig); 595 } 596 597 static void mbochs_remove(struct mdev_device *mdev) 598 { 599 struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev); 600 601 vfio_unregister_group_dev(&mdev_state->vdev); 602 vfio_put_device(&mdev_state->vdev); 603 } 604 605 static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf, 606 size_t count, loff_t *ppos) 607 { 608 struct mdev_state *mdev_state = 609 container_of(vdev, struct mdev_state, vdev); 610 unsigned int done = 0; 611 int ret; 612 613 while (count) { 614 size_t filled; 615 616 if (count >= 4 && !(*ppos % 4)) { 617 u32 val; 618 619 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 620 *ppos, false); 621 if (ret <= 0) 622 goto read_err; 623 624 if (copy_to_user(buf, &val, sizeof(val))) 625 goto read_err; 626 627 filled = 4; 628 } else if (count >= 2 && !(*ppos % 2)) { 629 u16 val; 630 631 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 632 *ppos, false); 633 if (ret <= 0) 634 goto read_err; 635 636 if (copy_to_user(buf, &val, sizeof(val))) 637 goto read_err; 638 639 filled = 2; 640 } else { 641 u8 val; 642 643 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 644 *ppos, false); 645 if (ret <= 0) 646 goto read_err; 647 648 if (copy_to_user(buf, &val, sizeof(val))) 649 goto read_err; 650 651 filled = 1; 652 } 653 654 count -= filled; 655 done += filled; 656 *ppos += filled; 657 buf += filled; 658 } 659 660 return done; 661 662 read_err: 663 return -EFAULT; 664 } 665 666 static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf, 667 size_t count, loff_t *ppos) 668 { 669 struct mdev_state *mdev_state = 670 container_of(vdev, struct mdev_state, vdev); 671 unsigned int done = 0; 672 int ret; 673 674 while (count) { 675 size_t filled; 676 677 if (count >= 4 && !(*ppos % 4)) { 678 u32 val; 679 680 if (copy_from_user(&val, buf, sizeof(val))) 681 goto write_err; 682 683 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 684 *ppos, true); 685 if (ret <= 0) 686 goto write_err; 687 688 filled = 4; 689 } else if (count >= 2 && !(*ppos % 2)) { 690 u16 val; 691 692 if (copy_from_user(&val, buf, sizeof(val))) 693 goto write_err; 694 695 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 696 *ppos, true); 697 if (ret <= 0) 698 goto write_err; 699 700 filled = 2; 701 } else { 702 u8 val; 703 704 if (copy_from_user(&val, buf, sizeof(val))) 705 goto write_err; 706 707 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 708 *ppos, true); 709 if (ret <= 0) 710 goto write_err; 711 712 filled = 1; 713 } 714 count -= filled; 715 done += filled; 716 *ppos += filled; 717 buf += filled; 718 } 719 720 return done; 721 write_err: 722 return -EFAULT; 723 } 724 725 static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 726 pgoff_t pgoff) 727 { 728 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 729 730 if (!mdev_state->pages[pgoff]) { 731 mdev_state->pages[pgoff] = 732 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0); 733 if (!mdev_state->pages[pgoff]) 734 return NULL; 735 } 736 737 get_page(mdev_state->pages[pgoff]); 738 return mdev_state->pages[pgoff]; 739 } 740 741 static struct page *mbochs_get_page(struct mdev_state *mdev_state, 742 pgoff_t pgoff) 743 { 744 struct page *page; 745 746 if (WARN_ON(pgoff >= mdev_state->pagecount)) 747 return NULL; 748 749 mutex_lock(&mdev_state->ops_lock); 750 page = __mbochs_get_page(mdev_state, pgoff); 751 mutex_unlock(&mdev_state->ops_lock); 752 753 return page; 754 } 755 756 static void mbochs_put_pages(struct mdev_state *mdev_state) 757 { 758 struct device *dev = mdev_dev(mdev_state->mdev); 759 int i, count = 0; 760 761 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 762 763 for (i = 0; i < mdev_state->pagecount; i++) { 764 if (!mdev_state->pages[i]) 765 continue; 766 put_page(mdev_state->pages[i]); 767 mdev_state->pages[i] = NULL; 768 count++; 769 } 770 dev_dbg(dev, "%s: %d pages released\n", __func__, count); 771 } 772 773 static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf) 774 { 775 struct vm_area_struct *vma = vmf->vma; 776 struct mdev_state *mdev_state = vma->vm_private_data; 777 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 778 779 if (page_offset >= mdev_state->pagecount) 780 return VM_FAULT_SIGBUS; 781 782 vmf->page = mbochs_get_page(mdev_state, page_offset); 783 if (!vmf->page) 784 return VM_FAULT_SIGBUS; 785 786 return 0; 787 } 788 789 static const struct vm_operations_struct mbochs_region_vm_ops = { 790 .fault = mbochs_region_vm_fault, 791 }; 792 793 static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma) 794 { 795 struct mdev_state *mdev_state = 796 container_of(vdev, struct mdev_state, vdev); 797 798 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT) 799 return -EINVAL; 800 if (vma->vm_end < vma->vm_start) 801 return -EINVAL; 802 if (vma->vm_end - vma->vm_start > mdev_state->memsize) 803 return -EINVAL; 804 if ((vma->vm_flags & VM_SHARED) == 0) 805 return -EINVAL; 806 807 vma->vm_ops = &mbochs_region_vm_ops; 808 vma->vm_private_data = mdev_state; 809 return 0; 810 } 811 812 static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf) 813 { 814 struct vm_area_struct *vma = vmf->vma; 815 struct mbochs_dmabuf *dmabuf = vma->vm_private_data; 816 817 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount)) 818 return VM_FAULT_SIGBUS; 819 820 vmf->page = dmabuf->pages[vmf->pgoff]; 821 get_page(vmf->page); 822 return 0; 823 } 824 825 static const struct vm_operations_struct mbochs_dmabuf_vm_ops = { 826 .fault = mbochs_dmabuf_vm_fault, 827 }; 828 829 static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma) 830 { 831 struct mbochs_dmabuf *dmabuf = buf->priv; 832 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 833 834 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 835 836 if ((vma->vm_flags & VM_SHARED) == 0) 837 return -EINVAL; 838 839 vma->vm_ops = &mbochs_dmabuf_vm_ops; 840 vma->vm_private_data = dmabuf; 841 return 0; 842 } 843 844 static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf, 845 const char *prefix) 846 { 847 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 848 u32 fourcc = dmabuf->mode.drm_format; 849 850 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n", 851 prefix, dmabuf->id, 852 fourcc ? ((fourcc >> 0) & 0xff) : '-', 853 fourcc ? ((fourcc >> 8) & 0xff) : '-', 854 fourcc ? ((fourcc >> 16) & 0xff) : '-', 855 fourcc ? ((fourcc >> 24) & 0xff) : '-', 856 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride, 857 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount); 858 } 859 860 static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at, 861 enum dma_data_direction direction) 862 { 863 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 864 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 865 struct sg_table *sg; 866 867 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 868 869 sg = kzalloc(sizeof(*sg), GFP_KERNEL); 870 if (!sg) 871 goto err1; 872 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount, 873 0, dmabuf->mode.size, GFP_KERNEL) < 0) 874 goto err2; 875 if (dma_map_sgtable(at->dev, sg, direction, 0)) 876 goto err3; 877 878 return sg; 879 880 err3: 881 sg_free_table(sg); 882 err2: 883 kfree(sg); 884 err1: 885 return ERR_PTR(-ENOMEM); 886 } 887 888 static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at, 889 struct sg_table *sg, 890 enum dma_data_direction direction) 891 { 892 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 893 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 894 895 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 896 897 dma_unmap_sgtable(at->dev, sg, direction, 0); 898 sg_free_table(sg); 899 kfree(sg); 900 } 901 902 static void mbochs_release_dmabuf(struct dma_buf *buf) 903 { 904 struct mbochs_dmabuf *dmabuf = buf->priv; 905 struct mdev_state *mdev_state = dmabuf->mdev_state; 906 struct device *dev = mdev_dev(mdev_state->mdev); 907 pgoff_t pg; 908 909 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 910 911 for (pg = 0; pg < dmabuf->pagecount; pg++) 912 put_page(dmabuf->pages[pg]); 913 914 mutex_lock(&mdev_state->ops_lock); 915 dmabuf->buf = NULL; 916 if (dmabuf->unlinked) 917 kfree(dmabuf); 918 mutex_unlock(&mdev_state->ops_lock); 919 } 920 921 static struct dma_buf_ops mbochs_dmabuf_ops = { 922 .map_dma_buf = mbochs_map_dmabuf, 923 .unmap_dma_buf = mbochs_unmap_dmabuf, 924 .release = mbochs_release_dmabuf, 925 .mmap = mbochs_mmap_dmabuf, 926 }; 927 928 static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state, 929 struct mbochs_mode *mode) 930 { 931 struct mbochs_dmabuf *dmabuf; 932 pgoff_t page_offset, pg; 933 934 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 935 936 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL); 937 if (!dmabuf) 938 return NULL; 939 940 dmabuf->mode = *mode; 941 dmabuf->id = mdev_state->next_id++; 942 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE); 943 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *), 944 GFP_KERNEL); 945 if (!dmabuf->pages) 946 goto err_free_dmabuf; 947 948 page_offset = dmabuf->mode.offset >> PAGE_SHIFT; 949 for (pg = 0; pg < dmabuf->pagecount; pg++) { 950 dmabuf->pages[pg] = __mbochs_get_page(mdev_state, 951 page_offset + pg); 952 if (!dmabuf->pages[pg]) 953 goto err_free_pages; 954 } 955 956 dmabuf->mdev_state = mdev_state; 957 list_add(&dmabuf->next, &mdev_state->dmabufs); 958 959 mbochs_print_dmabuf(dmabuf, __func__); 960 return dmabuf; 961 962 err_free_pages: 963 while (pg > 0) 964 put_page(dmabuf->pages[--pg]); 965 kfree(dmabuf->pages); 966 err_free_dmabuf: 967 kfree(dmabuf); 968 return NULL; 969 } 970 971 static struct mbochs_dmabuf * 972 mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state, 973 struct mbochs_mode *mode) 974 { 975 struct mbochs_dmabuf *dmabuf; 976 977 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 978 979 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 980 if (mbochs_modes_equal(&dmabuf->mode, mode)) 981 return dmabuf; 982 983 return NULL; 984 } 985 986 static struct mbochs_dmabuf * 987 mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id) 988 { 989 struct mbochs_dmabuf *dmabuf; 990 991 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 992 993 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 994 if (dmabuf->id == id) 995 return dmabuf; 996 997 return NULL; 998 } 999 1000 static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf) 1001 { 1002 struct mdev_state *mdev_state = dmabuf->mdev_state; 1003 struct device *dev = mdev_state->vdev.dev; 1004 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 1005 struct dma_buf *buf; 1006 1007 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 1008 1009 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) { 1010 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n", 1011 __func__); 1012 return -EINVAL; 1013 } 1014 1015 exp_info.ops = &mbochs_dmabuf_ops; 1016 exp_info.size = dmabuf->mode.size; 1017 exp_info.priv = dmabuf; 1018 1019 buf = dma_buf_export(&exp_info); 1020 if (IS_ERR(buf)) { 1021 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n", 1022 __func__, PTR_ERR(buf)); 1023 return PTR_ERR(buf); 1024 } 1025 1026 dmabuf->buf = buf; 1027 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 1028 return 0; 1029 } 1030 1031 static int mbochs_ioctl_get_region_info(struct vfio_device *vdev, 1032 struct vfio_region_info *region_info, 1033 struct vfio_info_cap *caps) 1034 { 1035 struct mdev_state *mdev_state = 1036 container_of(vdev, struct mdev_state, vdev); 1037 1038 if (region_info->index >= MBOCHS_NUM_REGIONS) 1039 return -EINVAL; 1040 1041 switch (region_info->index) { 1042 case VFIO_PCI_CONFIG_REGION_INDEX: 1043 region_info->offset = 0; 1044 region_info->size = MBOCHS_CONFIG_SPACE_SIZE; 1045 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1046 VFIO_REGION_INFO_FLAG_WRITE); 1047 break; 1048 case VFIO_PCI_BAR0_REGION_INDEX: 1049 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET; 1050 region_info->size = mdev_state->memsize; 1051 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1052 VFIO_REGION_INFO_FLAG_WRITE | 1053 VFIO_REGION_INFO_FLAG_MMAP); 1054 break; 1055 case VFIO_PCI_BAR2_REGION_INDEX: 1056 region_info->offset = MBOCHS_MMIO_BAR_OFFSET; 1057 region_info->size = MBOCHS_MMIO_BAR_SIZE; 1058 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1059 VFIO_REGION_INFO_FLAG_WRITE); 1060 break; 1061 case MBOCHS_EDID_REGION_INDEX: { 1062 struct vfio_region_info_cap_type cap_type = { 1063 .header.id = VFIO_REGION_INFO_CAP_TYPE, 1064 .header.version = 1, 1065 .type = VFIO_REGION_TYPE_GFX, 1066 .subtype = VFIO_REGION_SUBTYPE_GFX_EDID, 1067 }; 1068 1069 region_info->offset = MBOCHS_EDID_OFFSET; 1070 region_info->size = MBOCHS_EDID_SIZE; 1071 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1072 VFIO_REGION_INFO_FLAG_WRITE | 1073 VFIO_REGION_INFO_FLAG_CAPS); 1074 1075 return vfio_info_add_capability(caps, &cap_type.header, 1076 sizeof(cap_type)); 1077 } 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; 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 1219 case VFIO_DEVICE_GET_IRQ_INFO: 1220 { 1221 struct vfio_irq_info info; 1222 1223 minsz = offsetofend(struct vfio_irq_info, count); 1224 1225 if (copy_from_user(&info, (void __user *)arg, minsz)) 1226 return -EFAULT; 1227 1228 if ((info.argsz < minsz) || 1229 (info.index >= VFIO_PCI_NUM_IRQS)) 1230 return -EINVAL; 1231 1232 ret = mbochs_get_irq_info(&info); 1233 if (ret) 1234 return ret; 1235 1236 if (copy_to_user((void __user *)arg, &info, minsz)) 1237 return -EFAULT; 1238 1239 return 0; 1240 } 1241 1242 case VFIO_DEVICE_QUERY_GFX_PLANE: 1243 { 1244 struct vfio_device_gfx_plane_info plane = {}; 1245 1246 minsz = offsetofend(struct vfio_device_gfx_plane_info, 1247 region_index); 1248 1249 if (copy_from_user(&plane, (void __user *)arg, minsz)) 1250 return -EFAULT; 1251 1252 if (plane.argsz < minsz) 1253 return -EINVAL; 1254 1255 ret = mbochs_query_gfx_plane(mdev_state, &plane); 1256 if (ret) 1257 return ret; 1258 1259 if (copy_to_user((void __user *)arg, &plane, minsz)) 1260 return -EFAULT; 1261 1262 return 0; 1263 } 1264 1265 case VFIO_DEVICE_GET_GFX_DMABUF: 1266 { 1267 u32 dmabuf_id; 1268 1269 if (get_user(dmabuf_id, (__u32 __user *)arg)) 1270 return -EFAULT; 1271 1272 return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id); 1273 } 1274 1275 case VFIO_DEVICE_SET_IRQS: 1276 return -EINVAL; 1277 1278 case VFIO_DEVICE_RESET: 1279 return mbochs_reset(mdev_state); 1280 } 1281 return -ENOTTY; 1282 } 1283 1284 static void mbochs_close_device(struct vfio_device *vdev) 1285 { 1286 struct mdev_state *mdev_state = 1287 container_of(vdev, struct mdev_state, vdev); 1288 struct mbochs_dmabuf *dmabuf, *tmp; 1289 1290 mutex_lock(&mdev_state->ops_lock); 1291 1292 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) { 1293 list_del(&dmabuf->next); 1294 if (dmabuf->buf) { 1295 /* free in mbochs_release_dmabuf() */ 1296 dmabuf->unlinked = true; 1297 } else { 1298 kfree(dmabuf); 1299 } 1300 } 1301 mbochs_put_pages(mdev_state); 1302 1303 mutex_unlock(&mdev_state->ops_lock); 1304 } 1305 1306 static ssize_t 1307 memory_show(struct device *dev, struct device_attribute *attr, 1308 char *buf) 1309 { 1310 struct mdev_state *mdev_state = dev_get_drvdata(dev); 1311 1312 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes); 1313 } 1314 static DEVICE_ATTR_RO(memory); 1315 1316 static struct attribute *mdev_dev_attrs[] = { 1317 &dev_attr_memory.attr, 1318 NULL, 1319 }; 1320 1321 static const struct attribute_group mdev_dev_group = { 1322 .name = "vendor", 1323 .attrs = mdev_dev_attrs, 1324 }; 1325 1326 static const struct attribute_group *mdev_dev_groups[] = { 1327 &mdev_dev_group, 1328 NULL, 1329 }; 1330 1331 static ssize_t mbochs_show_description(struct mdev_type *mtype, char *buf) 1332 { 1333 struct mbochs_type *type = 1334 container_of(mtype, struct mbochs_type, type); 1335 1336 return sprintf(buf, "virtual display, %d MB video memory\n", 1337 type ? type->mbytes : 0); 1338 } 1339 1340 static unsigned int mbochs_get_available(struct mdev_type *mtype) 1341 { 1342 struct mbochs_type *type = 1343 container_of(mtype, struct mbochs_type, type); 1344 1345 return atomic_read(&mbochs_avail_mbytes) / type->mbytes; 1346 } 1347 1348 static const struct vfio_device_ops mbochs_dev_ops = { 1349 .close_device = mbochs_close_device, 1350 .init = mbochs_init_dev, 1351 .release = mbochs_release_dev, 1352 .read = mbochs_read, 1353 .write = mbochs_write, 1354 .ioctl = mbochs_ioctl, 1355 .get_region_info_caps = mbochs_ioctl_get_region_info, 1356 .mmap = mbochs_mmap, 1357 .bind_iommufd = vfio_iommufd_emulated_bind, 1358 .unbind_iommufd = vfio_iommufd_emulated_unbind, 1359 .attach_ioas = vfio_iommufd_emulated_attach_ioas, 1360 .detach_ioas = vfio_iommufd_emulated_detach_ioas, 1361 }; 1362 1363 static struct mdev_driver mbochs_driver = { 1364 .device_api = VFIO_DEVICE_API_PCI_STRING, 1365 .driver = { 1366 .name = "mbochs", 1367 .owner = THIS_MODULE, 1368 .mod_name = KBUILD_MODNAME, 1369 .dev_groups = mdev_dev_groups, 1370 }, 1371 .probe = mbochs_probe, 1372 .remove = mbochs_remove, 1373 .get_available = mbochs_get_available, 1374 .show_description = mbochs_show_description, 1375 }; 1376 1377 static const struct file_operations vd_fops = { 1378 .owner = THIS_MODULE, 1379 }; 1380 1381 static void mbochs_device_release(struct device *dev) 1382 { 1383 /* nothing */ 1384 } 1385 1386 static int __init mbochs_dev_init(void) 1387 { 1388 int ret = 0; 1389 1390 atomic_set(&mbochs_avail_mbytes, max_mbytes); 1391 1392 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME); 1393 if (ret < 0) { 1394 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret); 1395 return ret; 1396 } 1397 cdev_init(&mbochs_cdev, &vd_fops); 1398 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1); 1399 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt)); 1400 1401 ret = mdev_register_driver(&mbochs_driver); 1402 if (ret) 1403 goto err_cdev; 1404 1405 ret = class_register(&mbochs_class); 1406 if (ret) 1407 goto err_driver; 1408 mbochs_dev.class = &mbochs_class; 1409 mbochs_dev.release = mbochs_device_release; 1410 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME); 1411 1412 ret = device_register(&mbochs_dev); 1413 if (ret) 1414 goto err_put; 1415 1416 ret = mdev_register_parent(&mbochs_parent, &mbochs_dev, &mbochs_driver, 1417 mbochs_mdev_types, 1418 ARRAY_SIZE(mbochs_mdev_types)); 1419 if (ret) 1420 goto err_device; 1421 1422 return 0; 1423 1424 err_device: 1425 device_del(&mbochs_dev); 1426 err_put: 1427 put_device(&mbochs_dev); 1428 class_unregister(&mbochs_class); 1429 err_driver: 1430 mdev_unregister_driver(&mbochs_driver); 1431 err_cdev: 1432 cdev_del(&mbochs_cdev); 1433 unregister_chrdev_region(mbochs_devt, MINORMASK + 1); 1434 return ret; 1435 } 1436 1437 static void __exit mbochs_dev_exit(void) 1438 { 1439 mbochs_dev.bus = NULL; 1440 mdev_unregister_parent(&mbochs_parent); 1441 1442 device_unregister(&mbochs_dev); 1443 mdev_unregister_driver(&mbochs_driver); 1444 cdev_del(&mbochs_cdev); 1445 unregister_chrdev_region(mbochs_devt, MINORMASK + 1); 1446 class_unregister(&mbochs_class); 1447 } 1448 1449 MODULE_IMPORT_NS("DMA_BUF"); 1450 module_init(mbochs_dev_init) 1451 module_exit(mbochs_dev_exit) 1452