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_LICENSE("GPL v2"); 92 93 static int max_mbytes = 256; 94 module_param_named(count, max_mbytes, int, 0444); 95 MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices"); 96 97 98 #define MBOCHS_TYPE_1 "small" 99 #define MBOCHS_TYPE_2 "medium" 100 #define MBOCHS_TYPE_3 "large" 101 102 static struct mbochs_type { 103 struct mdev_type type; 104 u32 mbytes; 105 u32 max_x; 106 u32 max_y; 107 } mbochs_types[] = { 108 { 109 .type.sysfs_name = MBOCHS_TYPE_1, 110 .type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1, 111 .mbytes = 4, 112 .max_x = 800, 113 .max_y = 600, 114 }, { 115 .type.sysfs_name = MBOCHS_TYPE_2, 116 .type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2, 117 .mbytes = 16, 118 .max_x = 1920, 119 .max_y = 1440, 120 }, { 121 .type.sysfs_name = MBOCHS_TYPE_3, 122 .type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3, 123 .mbytes = 64, 124 .max_x = 0, 125 .max_y = 0, 126 }, 127 }; 128 129 static struct mdev_type *mbochs_mdev_types[] = { 130 &mbochs_types[0].type, 131 &mbochs_types[1].type, 132 &mbochs_types[2].type, 133 }; 134 135 static dev_t mbochs_devt; 136 static struct class *mbochs_class; 137 static struct cdev mbochs_cdev; 138 static struct device mbochs_dev; 139 static struct mdev_parent mbochs_parent; 140 static atomic_t mbochs_avail_mbytes; 141 static const struct vfio_device_ops mbochs_dev_ops; 142 143 struct vfio_region_info_ext { 144 struct vfio_region_info base; 145 struct vfio_region_info_cap_type type; 146 }; 147 148 struct mbochs_mode { 149 u32 drm_format; 150 u32 bytepp; 151 u32 width; 152 u32 height; 153 u32 stride; 154 u32 __pad; 155 u64 offset; 156 u64 size; 157 }; 158 159 struct mbochs_dmabuf { 160 struct mbochs_mode mode; 161 u32 id; 162 struct page **pages; 163 pgoff_t pagecount; 164 struct dma_buf *buf; 165 struct mdev_state *mdev_state; 166 struct list_head next; 167 bool unlinked; 168 }; 169 170 /* State of each mdev device */ 171 struct mdev_state { 172 struct vfio_device vdev; 173 u8 *vconfig; 174 u64 bar_mask[3]; 175 u32 memory_bar_mask; 176 struct mutex ops_lock; 177 struct mdev_device *mdev; 178 179 const struct mbochs_type *type; 180 u16 vbe[VBE_DISPI_INDEX_COUNT]; 181 u64 memsize; 182 struct page **pages; 183 pgoff_t pagecount; 184 struct vfio_region_gfx_edid edid_regs; 185 u8 edid_blob[0x400]; 186 187 struct list_head dmabufs; 188 u32 active_id; 189 u32 next_id; 190 }; 191 192 static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = { 193 [VBE_DISPI_INDEX_ID] = "id", 194 [VBE_DISPI_INDEX_XRES] = "xres", 195 [VBE_DISPI_INDEX_YRES] = "yres", 196 [VBE_DISPI_INDEX_BPP] = "bpp", 197 [VBE_DISPI_INDEX_ENABLE] = "enable", 198 [VBE_DISPI_INDEX_BANK] = "bank", 199 [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width", 200 [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height", 201 [VBE_DISPI_INDEX_X_OFFSET] = "x-offset", 202 [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset", 203 [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem", 204 }; 205 206 static const char *vbe_name(u32 index) 207 { 208 if (index < ARRAY_SIZE(vbe_name_list)) 209 return vbe_name_list[index]; 210 return "(invalid)"; 211 } 212 213 static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 214 pgoff_t pgoff); 215 static struct page *mbochs_get_page(struct mdev_state *mdev_state, 216 pgoff_t pgoff); 217 218 static void mbochs_create_config_space(struct mdev_state *mdev_state) 219 { 220 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID], 221 0x1234); 222 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID], 223 0x1111); 224 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID], 225 PCI_SUBVENDOR_ID_REDHAT_QUMRANET); 226 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID], 227 PCI_SUBDEVICE_ID_QEMU); 228 229 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND], 230 PCI_COMMAND_IO | PCI_COMMAND_MEMORY); 231 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE], 232 PCI_CLASS_DISPLAY_OTHER); 233 mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01; 234 235 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0], 236 PCI_BASE_ADDRESS_SPACE_MEMORY | 237 PCI_BASE_ADDRESS_MEM_TYPE_32 | 238 PCI_BASE_ADDRESS_MEM_PREFETCH); 239 mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1; 240 241 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2], 242 PCI_BASE_ADDRESS_SPACE_MEMORY | 243 PCI_BASE_ADDRESS_MEM_TYPE_32); 244 mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1; 245 } 246 247 static int mbochs_check_framebuffer(struct mdev_state *mdev_state, 248 struct mbochs_mode *mode) 249 { 250 struct device *dev = mdev_dev(mdev_state->mdev); 251 u16 *vbe = mdev_state->vbe; 252 u32 virt_width; 253 254 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 255 256 if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) 257 goto nofb; 258 259 memset(mode, 0, sizeof(*mode)); 260 switch (vbe[VBE_DISPI_INDEX_BPP]) { 261 case 32: 262 mode->drm_format = DRM_FORMAT_XRGB8888; 263 mode->bytepp = 4; 264 break; 265 default: 266 dev_info_ratelimited(dev, "%s: bpp %d not supported\n", 267 __func__, vbe[VBE_DISPI_INDEX_BPP]); 268 goto nofb; 269 } 270 271 mode->width = vbe[VBE_DISPI_INDEX_XRES]; 272 mode->height = vbe[VBE_DISPI_INDEX_YRES]; 273 virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH]; 274 if (virt_width < mode->width) 275 virt_width = mode->width; 276 mode->stride = virt_width * mode->bytepp; 277 mode->size = (u64)mode->stride * mode->height; 278 mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp + 279 (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride); 280 281 if (mode->width < 64 || mode->height < 64) { 282 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n", 283 __func__, mode->width, mode->height); 284 goto nofb; 285 } 286 if (mode->offset + mode->size > mdev_state->memsize) { 287 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n", 288 __func__); 289 goto nofb; 290 } 291 292 return 0; 293 294 nofb: 295 memset(mode, 0, sizeof(*mode)); 296 return -EINVAL; 297 } 298 299 static bool mbochs_modes_equal(struct mbochs_mode *mode1, 300 struct mbochs_mode *mode2) 301 { 302 return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0; 303 } 304 305 static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset, 306 char *buf, u32 count) 307 { 308 struct device *dev = mdev_dev(mdev_state->mdev); 309 int index = (offset - PCI_BASE_ADDRESS_0) / 0x04; 310 u32 cfg_addr; 311 312 switch (offset) { 313 case PCI_BASE_ADDRESS_0: 314 case PCI_BASE_ADDRESS_2: 315 cfg_addr = *(u32 *)buf; 316 317 if (cfg_addr == 0xffffffff) { 318 cfg_addr = (cfg_addr & mdev_state->bar_mask[index]); 319 } else { 320 cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK; 321 if (cfg_addr) 322 dev_info(dev, "BAR #%d @ 0x%x\n", 323 index, cfg_addr); 324 } 325 326 cfg_addr |= (mdev_state->vconfig[offset] & 327 ~PCI_BASE_ADDRESS_MEM_MASK); 328 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr); 329 break; 330 } 331 } 332 333 static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset, 334 char *buf, u32 count) 335 { 336 struct device *dev = mdev_dev(mdev_state->mdev); 337 int index; 338 u16 reg16; 339 340 switch (offset) { 341 case 0x400 ... 0x41f: /* vga ioports remapped */ 342 goto unhandled; 343 case 0x500 ... 0x515: /* bochs dispi interface */ 344 if (count != 2) 345 goto unhandled; 346 index = (offset - 0x500) / 2; 347 reg16 = *(u16 *)buf; 348 if (index < ARRAY_SIZE(mdev_state->vbe)) 349 mdev_state->vbe[index] = reg16; 350 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n", 351 __func__, index, reg16, vbe_name(index)); 352 break; 353 case 0x600 ... 0x607: /* qemu extended regs */ 354 goto unhandled; 355 default: 356 unhandled: 357 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", 358 __func__, offset, count); 359 break; 360 } 361 } 362 363 static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset, 364 char *buf, u32 count) 365 { 366 struct device *dev = mdev_dev(mdev_state->mdev); 367 struct vfio_region_gfx_edid *edid; 368 u16 reg16 = 0; 369 int index; 370 371 switch (offset) { 372 case 0x000 ... 0x3ff: /* edid block */ 373 edid = &mdev_state->edid_regs; 374 if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP || 375 offset >= edid->edid_size) { 376 memset(buf, 0, count); 377 break; 378 } 379 memcpy(buf, mdev_state->edid_blob + offset, count); 380 break; 381 case 0x500 ... 0x515: /* bochs dispi interface */ 382 if (count != 2) 383 goto unhandled; 384 index = (offset - 0x500) / 2; 385 if (index < ARRAY_SIZE(mdev_state->vbe)) 386 reg16 = mdev_state->vbe[index]; 387 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n", 388 __func__, index, reg16, vbe_name(index)); 389 *(u16 *)buf = reg16; 390 break; 391 default: 392 unhandled: 393 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", 394 __func__, offset, count); 395 memset(buf, 0, count); 396 break; 397 } 398 } 399 400 static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset, 401 char *buf, u32 count, bool is_write) 402 { 403 char *regs = (void *)&mdev_state->edid_regs; 404 405 if (offset + count > sizeof(mdev_state->edid_regs)) 406 return; 407 if (count != 4) 408 return; 409 if (offset % 4) 410 return; 411 412 if (is_write) { 413 switch (offset) { 414 case offsetof(struct vfio_region_gfx_edid, link_state): 415 case offsetof(struct vfio_region_gfx_edid, edid_size): 416 memcpy(regs + offset, buf, count); 417 break; 418 default: 419 /* read-only regs */ 420 break; 421 } 422 } else { 423 memcpy(buf, regs + offset, count); 424 } 425 } 426 427 static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset, 428 char *buf, u32 count, bool is_write) 429 { 430 if (offset + count > mdev_state->edid_regs.edid_max_size) 431 return; 432 if (is_write) 433 memcpy(mdev_state->edid_blob + offset, buf, count); 434 else 435 memcpy(buf, mdev_state->edid_blob + offset, count); 436 } 437 438 static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf, 439 size_t count, loff_t pos, bool is_write) 440 { 441 struct page *pg; 442 loff_t poff; 443 char *map; 444 int ret = 0; 445 446 mutex_lock(&mdev_state->ops_lock); 447 448 if (pos < MBOCHS_CONFIG_SPACE_SIZE) { 449 if (is_write) 450 handle_pci_cfg_write(mdev_state, pos, buf, count); 451 else 452 memcpy(buf, (mdev_state->vconfig + pos), count); 453 454 } else if (pos >= MBOCHS_MMIO_BAR_OFFSET && 455 pos + count <= (MBOCHS_MMIO_BAR_OFFSET + 456 MBOCHS_MMIO_BAR_SIZE)) { 457 pos -= MBOCHS_MMIO_BAR_OFFSET; 458 if (is_write) 459 handle_mmio_write(mdev_state, pos, buf, count); 460 else 461 handle_mmio_read(mdev_state, pos, buf, count); 462 463 } else if (pos >= MBOCHS_EDID_OFFSET && 464 pos + count <= (MBOCHS_EDID_OFFSET + 465 MBOCHS_EDID_SIZE)) { 466 pos -= MBOCHS_EDID_OFFSET; 467 if (pos < MBOCHS_EDID_BLOB_OFFSET) { 468 handle_edid_regs(mdev_state, pos, buf, count, is_write); 469 } else { 470 pos -= MBOCHS_EDID_BLOB_OFFSET; 471 handle_edid_blob(mdev_state, pos, buf, count, is_write); 472 } 473 474 } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET && 475 pos + count <= 476 MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) { 477 pos -= MBOCHS_MMIO_BAR_OFFSET; 478 poff = pos & ~PAGE_MASK; 479 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT); 480 map = kmap(pg); 481 if (is_write) 482 memcpy(map + poff, buf, count); 483 else 484 memcpy(buf, map + poff, count); 485 kunmap(pg); 486 put_page(pg); 487 488 } else { 489 dev_dbg(mdev_state->vdev.dev, "%s: %s @0x%llx (unhandled)\n", 490 __func__, is_write ? "WR" : "RD", pos); 491 ret = -1; 492 goto accessfailed; 493 } 494 495 ret = count; 496 497 498 accessfailed: 499 mutex_unlock(&mdev_state->ops_lock); 500 501 return ret; 502 } 503 504 static int mbochs_reset(struct mdev_state *mdev_state) 505 { 506 u32 size64k = mdev_state->memsize / (64 * 1024); 507 int i; 508 509 for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++) 510 mdev_state->vbe[i] = 0; 511 mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5; 512 mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k; 513 return 0; 514 } 515 516 static int mbochs_init_dev(struct vfio_device *vdev) 517 { 518 struct mdev_state *mdev_state = 519 container_of(vdev, struct mdev_state, vdev); 520 struct mdev_device *mdev = to_mdev_device(vdev->dev); 521 struct mbochs_type *type = 522 container_of(mdev->type, struct mbochs_type, type); 523 int avail_mbytes = atomic_read(&mbochs_avail_mbytes); 524 int ret = -ENOMEM; 525 526 do { 527 if (avail_mbytes < type->mbytes) 528 return -ENOSPC; 529 } while (!atomic_try_cmpxchg(&mbochs_avail_mbytes, &avail_mbytes, 530 avail_mbytes - type->mbytes)); 531 532 mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL); 533 if (!mdev_state->vconfig) 534 goto err_avail; 535 536 mdev_state->memsize = type->mbytes * 1024 * 1024; 537 mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT; 538 mdev_state->pages = kcalloc(mdev_state->pagecount, 539 sizeof(struct page *), 540 GFP_KERNEL); 541 if (!mdev_state->pages) 542 goto err_vconfig; 543 544 mutex_init(&mdev_state->ops_lock); 545 mdev_state->mdev = mdev; 546 INIT_LIST_HEAD(&mdev_state->dmabufs); 547 mdev_state->next_id = 1; 548 549 mdev_state->type = type; 550 mdev_state->edid_regs.max_xres = type->max_x; 551 mdev_state->edid_regs.max_yres = type->max_y; 552 mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET; 553 mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob); 554 mbochs_create_config_space(mdev_state); 555 mbochs_reset(mdev_state); 556 557 dev_info(vdev->dev, "%s: %s, %d MB, %ld pages\n", __func__, 558 type->type.pretty_name, type->mbytes, mdev_state->pagecount); 559 return 0; 560 561 err_vconfig: 562 kfree(mdev_state->vconfig); 563 err_avail: 564 atomic_add(type->mbytes, &mbochs_avail_mbytes); 565 return ret; 566 } 567 568 static int mbochs_probe(struct mdev_device *mdev) 569 { 570 struct mdev_state *mdev_state; 571 int ret = -ENOMEM; 572 573 mdev_state = vfio_alloc_device(mdev_state, vdev, &mdev->dev, 574 &mbochs_dev_ops); 575 if (IS_ERR(mdev_state)) 576 return PTR_ERR(mdev_state); 577 578 ret = vfio_register_emulated_iommu_dev(&mdev_state->vdev); 579 if (ret) 580 goto err_put_vdev; 581 dev_set_drvdata(&mdev->dev, mdev_state); 582 return 0; 583 584 err_put_vdev: 585 vfio_put_device(&mdev_state->vdev); 586 return ret; 587 } 588 589 static void mbochs_release_dev(struct vfio_device *vdev) 590 { 591 struct mdev_state *mdev_state = 592 container_of(vdev, struct mdev_state, vdev); 593 594 atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes); 595 kfree(mdev_state->pages); 596 kfree(mdev_state->vconfig); 597 } 598 599 static void mbochs_remove(struct mdev_device *mdev) 600 { 601 struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev); 602 603 vfio_unregister_group_dev(&mdev_state->vdev); 604 vfio_put_device(&mdev_state->vdev); 605 } 606 607 static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf, 608 size_t count, loff_t *ppos) 609 { 610 struct mdev_state *mdev_state = 611 container_of(vdev, struct mdev_state, vdev); 612 unsigned int done = 0; 613 int ret; 614 615 while (count) { 616 size_t filled; 617 618 if (count >= 4 && !(*ppos % 4)) { 619 u32 val; 620 621 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 622 *ppos, false); 623 if (ret <= 0) 624 goto read_err; 625 626 if (copy_to_user(buf, &val, sizeof(val))) 627 goto read_err; 628 629 filled = 4; 630 } else if (count >= 2 && !(*ppos % 2)) { 631 u16 val; 632 633 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 634 *ppos, false); 635 if (ret <= 0) 636 goto read_err; 637 638 if (copy_to_user(buf, &val, sizeof(val))) 639 goto read_err; 640 641 filled = 2; 642 } else { 643 u8 val; 644 645 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 646 *ppos, false); 647 if (ret <= 0) 648 goto read_err; 649 650 if (copy_to_user(buf, &val, sizeof(val))) 651 goto read_err; 652 653 filled = 1; 654 } 655 656 count -= filled; 657 done += filled; 658 *ppos += filled; 659 buf += filled; 660 } 661 662 return done; 663 664 read_err: 665 return -EFAULT; 666 } 667 668 static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf, 669 size_t count, loff_t *ppos) 670 { 671 struct mdev_state *mdev_state = 672 container_of(vdev, struct mdev_state, vdev); 673 unsigned int done = 0; 674 int ret; 675 676 while (count) { 677 size_t filled; 678 679 if (count >= 4 && !(*ppos % 4)) { 680 u32 val; 681 682 if (copy_from_user(&val, buf, sizeof(val))) 683 goto write_err; 684 685 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 686 *ppos, true); 687 if (ret <= 0) 688 goto write_err; 689 690 filled = 4; 691 } else if (count >= 2 && !(*ppos % 2)) { 692 u16 val; 693 694 if (copy_from_user(&val, buf, sizeof(val))) 695 goto write_err; 696 697 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 698 *ppos, true); 699 if (ret <= 0) 700 goto write_err; 701 702 filled = 2; 703 } else { 704 u8 val; 705 706 if (copy_from_user(&val, buf, sizeof(val))) 707 goto write_err; 708 709 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 710 *ppos, true); 711 if (ret <= 0) 712 goto write_err; 713 714 filled = 1; 715 } 716 count -= filled; 717 done += filled; 718 *ppos += filled; 719 buf += filled; 720 } 721 722 return done; 723 write_err: 724 return -EFAULT; 725 } 726 727 static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 728 pgoff_t pgoff) 729 { 730 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 731 732 if (!mdev_state->pages[pgoff]) { 733 mdev_state->pages[pgoff] = 734 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0); 735 if (!mdev_state->pages[pgoff]) 736 return NULL; 737 } 738 739 get_page(mdev_state->pages[pgoff]); 740 return mdev_state->pages[pgoff]; 741 } 742 743 static struct page *mbochs_get_page(struct mdev_state *mdev_state, 744 pgoff_t pgoff) 745 { 746 struct page *page; 747 748 if (WARN_ON(pgoff >= mdev_state->pagecount)) 749 return NULL; 750 751 mutex_lock(&mdev_state->ops_lock); 752 page = __mbochs_get_page(mdev_state, pgoff); 753 mutex_unlock(&mdev_state->ops_lock); 754 755 return page; 756 } 757 758 static void mbochs_put_pages(struct mdev_state *mdev_state) 759 { 760 struct device *dev = mdev_dev(mdev_state->mdev); 761 int i, count = 0; 762 763 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 764 765 for (i = 0; i < mdev_state->pagecount; i++) { 766 if (!mdev_state->pages[i]) 767 continue; 768 put_page(mdev_state->pages[i]); 769 mdev_state->pages[i] = NULL; 770 count++; 771 } 772 dev_dbg(dev, "%s: %d pages released\n", __func__, count); 773 } 774 775 static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf) 776 { 777 struct vm_area_struct *vma = vmf->vma; 778 struct mdev_state *mdev_state = vma->vm_private_data; 779 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 780 781 if (page_offset >= mdev_state->pagecount) 782 return VM_FAULT_SIGBUS; 783 784 vmf->page = mbochs_get_page(mdev_state, page_offset); 785 if (!vmf->page) 786 return VM_FAULT_SIGBUS; 787 788 return 0; 789 } 790 791 static const struct vm_operations_struct mbochs_region_vm_ops = { 792 .fault = mbochs_region_vm_fault, 793 }; 794 795 static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma) 796 { 797 struct mdev_state *mdev_state = 798 container_of(vdev, struct mdev_state, vdev); 799 800 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT) 801 return -EINVAL; 802 if (vma->vm_end < vma->vm_start) 803 return -EINVAL; 804 if (vma->vm_end - vma->vm_start > mdev_state->memsize) 805 return -EINVAL; 806 if ((vma->vm_flags & VM_SHARED) == 0) 807 return -EINVAL; 808 809 vma->vm_ops = &mbochs_region_vm_ops; 810 vma->vm_private_data = mdev_state; 811 return 0; 812 } 813 814 static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf) 815 { 816 struct vm_area_struct *vma = vmf->vma; 817 struct mbochs_dmabuf *dmabuf = vma->vm_private_data; 818 819 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount)) 820 return VM_FAULT_SIGBUS; 821 822 vmf->page = dmabuf->pages[vmf->pgoff]; 823 get_page(vmf->page); 824 return 0; 825 } 826 827 static const struct vm_operations_struct mbochs_dmabuf_vm_ops = { 828 .fault = mbochs_dmabuf_vm_fault, 829 }; 830 831 static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma) 832 { 833 struct mbochs_dmabuf *dmabuf = buf->priv; 834 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 835 836 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 837 838 if ((vma->vm_flags & VM_SHARED) == 0) 839 return -EINVAL; 840 841 vma->vm_ops = &mbochs_dmabuf_vm_ops; 842 vma->vm_private_data = dmabuf; 843 return 0; 844 } 845 846 static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf, 847 const char *prefix) 848 { 849 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 850 u32 fourcc = dmabuf->mode.drm_format; 851 852 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n", 853 prefix, dmabuf->id, 854 fourcc ? ((fourcc >> 0) & 0xff) : '-', 855 fourcc ? ((fourcc >> 8) & 0xff) : '-', 856 fourcc ? ((fourcc >> 16) & 0xff) : '-', 857 fourcc ? ((fourcc >> 24) & 0xff) : '-', 858 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride, 859 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount); 860 } 861 862 static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at, 863 enum dma_data_direction direction) 864 { 865 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 866 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 867 struct sg_table *sg; 868 869 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 870 871 sg = kzalloc(sizeof(*sg), GFP_KERNEL); 872 if (!sg) 873 goto err1; 874 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount, 875 0, dmabuf->mode.size, GFP_KERNEL) < 0) 876 goto err2; 877 if (dma_map_sgtable(at->dev, sg, direction, 0)) 878 goto err3; 879 880 return sg; 881 882 err3: 883 sg_free_table(sg); 884 err2: 885 kfree(sg); 886 err1: 887 return ERR_PTR(-ENOMEM); 888 } 889 890 static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at, 891 struct sg_table *sg, 892 enum dma_data_direction direction) 893 { 894 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 895 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 896 897 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 898 899 dma_unmap_sgtable(at->dev, sg, direction, 0); 900 sg_free_table(sg); 901 kfree(sg); 902 } 903 904 static void mbochs_release_dmabuf(struct dma_buf *buf) 905 { 906 struct mbochs_dmabuf *dmabuf = buf->priv; 907 struct mdev_state *mdev_state = dmabuf->mdev_state; 908 struct device *dev = mdev_dev(mdev_state->mdev); 909 pgoff_t pg; 910 911 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 912 913 for (pg = 0; pg < dmabuf->pagecount; pg++) 914 put_page(dmabuf->pages[pg]); 915 916 mutex_lock(&mdev_state->ops_lock); 917 dmabuf->buf = NULL; 918 if (dmabuf->unlinked) 919 kfree(dmabuf); 920 mutex_unlock(&mdev_state->ops_lock); 921 } 922 923 static struct dma_buf_ops mbochs_dmabuf_ops = { 924 .map_dma_buf = mbochs_map_dmabuf, 925 .unmap_dma_buf = mbochs_unmap_dmabuf, 926 .release = mbochs_release_dmabuf, 927 .mmap = mbochs_mmap_dmabuf, 928 }; 929 930 static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state, 931 struct mbochs_mode *mode) 932 { 933 struct mbochs_dmabuf *dmabuf; 934 pgoff_t page_offset, pg; 935 936 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 937 938 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL); 939 if (!dmabuf) 940 return NULL; 941 942 dmabuf->mode = *mode; 943 dmabuf->id = mdev_state->next_id++; 944 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE); 945 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *), 946 GFP_KERNEL); 947 if (!dmabuf->pages) 948 goto err_free_dmabuf; 949 950 page_offset = dmabuf->mode.offset >> PAGE_SHIFT; 951 for (pg = 0; pg < dmabuf->pagecount; pg++) { 952 dmabuf->pages[pg] = __mbochs_get_page(mdev_state, 953 page_offset + pg); 954 if (!dmabuf->pages[pg]) 955 goto err_free_pages; 956 } 957 958 dmabuf->mdev_state = mdev_state; 959 list_add(&dmabuf->next, &mdev_state->dmabufs); 960 961 mbochs_print_dmabuf(dmabuf, __func__); 962 return dmabuf; 963 964 err_free_pages: 965 while (pg > 0) 966 put_page(dmabuf->pages[--pg]); 967 kfree(dmabuf->pages); 968 err_free_dmabuf: 969 kfree(dmabuf); 970 return NULL; 971 } 972 973 static struct mbochs_dmabuf * 974 mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state, 975 struct mbochs_mode *mode) 976 { 977 struct mbochs_dmabuf *dmabuf; 978 979 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 980 981 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 982 if (mbochs_modes_equal(&dmabuf->mode, mode)) 983 return dmabuf; 984 985 return NULL; 986 } 987 988 static struct mbochs_dmabuf * 989 mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id) 990 { 991 struct mbochs_dmabuf *dmabuf; 992 993 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 994 995 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 996 if (dmabuf->id == id) 997 return dmabuf; 998 999 return NULL; 1000 } 1001 1002 static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf) 1003 { 1004 struct mdev_state *mdev_state = dmabuf->mdev_state; 1005 struct device *dev = mdev_state->vdev.dev; 1006 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 1007 struct dma_buf *buf; 1008 1009 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 1010 1011 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) { 1012 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n", 1013 __func__); 1014 return -EINVAL; 1015 } 1016 1017 exp_info.ops = &mbochs_dmabuf_ops; 1018 exp_info.size = dmabuf->mode.size; 1019 exp_info.priv = dmabuf; 1020 1021 buf = dma_buf_export(&exp_info); 1022 if (IS_ERR(buf)) { 1023 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n", 1024 __func__, PTR_ERR(buf)); 1025 return PTR_ERR(buf); 1026 } 1027 1028 dmabuf->buf = buf; 1029 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 1030 return 0; 1031 } 1032 1033 static int mbochs_get_region_info(struct mdev_state *mdev_state, 1034 struct vfio_region_info_ext *ext) 1035 { 1036 struct vfio_region_info *region_info = &ext->base; 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 ext->base.argsz = sizeof(*ext); 1063 ext->base.offset = MBOCHS_EDID_OFFSET; 1064 ext->base.size = MBOCHS_EDID_SIZE; 1065 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ | 1066 VFIO_REGION_INFO_FLAG_WRITE | 1067 VFIO_REGION_INFO_FLAG_CAPS); 1068 ext->base.cap_offset = offsetof(typeof(*ext), type); 1069 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE; 1070 ext->type.header.version = 1; 1071 ext->type.header.next = 0; 1072 ext->type.type = VFIO_REGION_TYPE_GFX; 1073 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID; 1074 break; 1075 default: 1076 region_info->size = 0; 1077 region_info->offset = 0; 1078 region_info->flags = 0; 1079 } 1080 1081 return 0; 1082 } 1083 1084 static int mbochs_get_irq_info(struct vfio_irq_info *irq_info) 1085 { 1086 irq_info->count = 0; 1087 return 0; 1088 } 1089 1090 static int mbochs_get_device_info(struct vfio_device_info *dev_info) 1091 { 1092 dev_info->flags = VFIO_DEVICE_FLAGS_PCI; 1093 dev_info->num_regions = MBOCHS_NUM_REGIONS; 1094 dev_info->num_irqs = VFIO_PCI_NUM_IRQS; 1095 return 0; 1096 } 1097 1098 static int mbochs_query_gfx_plane(struct mdev_state *mdev_state, 1099 struct vfio_device_gfx_plane_info *plane) 1100 { 1101 struct mbochs_dmabuf *dmabuf; 1102 struct mbochs_mode mode; 1103 int ret; 1104 1105 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) { 1106 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE | 1107 VFIO_GFX_PLANE_TYPE_DMABUF)) 1108 return 0; 1109 return -EINVAL; 1110 } 1111 1112 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF) 1113 return -EINVAL; 1114 1115 plane->drm_format_mod = 0; 1116 plane->x_pos = 0; 1117 plane->y_pos = 0; 1118 plane->x_hot = 0; 1119 plane->y_hot = 0; 1120 1121 mutex_lock(&mdev_state->ops_lock); 1122 1123 ret = -EINVAL; 1124 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY) 1125 ret = mbochs_check_framebuffer(mdev_state, &mode); 1126 if (ret < 0) { 1127 plane->drm_format = 0; 1128 plane->width = 0; 1129 plane->height = 0; 1130 plane->stride = 0; 1131 plane->size = 0; 1132 plane->dmabuf_id = 0; 1133 goto done; 1134 } 1135 1136 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode); 1137 if (!dmabuf) 1138 mbochs_dmabuf_alloc(mdev_state, &mode); 1139 if (!dmabuf) { 1140 mutex_unlock(&mdev_state->ops_lock); 1141 return -ENOMEM; 1142 } 1143 1144 plane->drm_format = dmabuf->mode.drm_format; 1145 plane->width = dmabuf->mode.width; 1146 plane->height = dmabuf->mode.height; 1147 plane->stride = dmabuf->mode.stride; 1148 plane->size = dmabuf->mode.size; 1149 plane->dmabuf_id = dmabuf->id; 1150 1151 done: 1152 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY && 1153 mdev_state->active_id != plane->dmabuf_id) { 1154 dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n", 1155 __func__, mdev_state->active_id, plane->dmabuf_id); 1156 mdev_state->active_id = plane->dmabuf_id; 1157 } 1158 mutex_unlock(&mdev_state->ops_lock); 1159 return 0; 1160 } 1161 1162 static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id) 1163 { 1164 struct mbochs_dmabuf *dmabuf; 1165 1166 mutex_lock(&mdev_state->ops_lock); 1167 1168 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id); 1169 if (!dmabuf) { 1170 mutex_unlock(&mdev_state->ops_lock); 1171 return -ENOENT; 1172 } 1173 1174 if (!dmabuf->buf) 1175 mbochs_dmabuf_export(dmabuf); 1176 1177 mutex_unlock(&mdev_state->ops_lock); 1178 1179 if (!dmabuf->buf) 1180 return -EINVAL; 1181 1182 return dma_buf_fd(dmabuf->buf, 0); 1183 } 1184 1185 static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd, 1186 unsigned long arg) 1187 { 1188 struct mdev_state *mdev_state = 1189 container_of(vdev, struct mdev_state, vdev); 1190 int ret = 0; 1191 unsigned long minsz, outsz; 1192 1193 switch (cmd) { 1194 case VFIO_DEVICE_GET_INFO: 1195 { 1196 struct vfio_device_info info; 1197 1198 minsz = offsetofend(struct vfio_device_info, num_irqs); 1199 1200 if (copy_from_user(&info, (void __user *)arg, minsz)) 1201 return -EFAULT; 1202 1203 if (info.argsz < minsz) 1204 return -EINVAL; 1205 1206 ret = mbochs_get_device_info(&info); 1207 if (ret) 1208 return ret; 1209 1210 if (copy_to_user((void __user *)arg, &info, minsz)) 1211 return -EFAULT; 1212 1213 return 0; 1214 } 1215 case VFIO_DEVICE_GET_REGION_INFO: 1216 { 1217 struct vfio_region_info_ext info; 1218 1219 minsz = offsetofend(typeof(info), base.offset); 1220 1221 if (copy_from_user(&info, (void __user *)arg, minsz)) 1222 return -EFAULT; 1223 1224 outsz = info.base.argsz; 1225 if (outsz < minsz) 1226 return -EINVAL; 1227 if (outsz > sizeof(info)) 1228 return -EINVAL; 1229 1230 ret = mbochs_get_region_info(mdev_state, &info); 1231 if (ret) 1232 return ret; 1233 1234 if (copy_to_user((void __user *)arg, &info, outsz)) 1235 return -EFAULT; 1236 1237 return 0; 1238 } 1239 1240 case VFIO_DEVICE_GET_IRQ_INFO: 1241 { 1242 struct vfio_irq_info info; 1243 1244 minsz = offsetofend(struct vfio_irq_info, count); 1245 1246 if (copy_from_user(&info, (void __user *)arg, minsz)) 1247 return -EFAULT; 1248 1249 if ((info.argsz < minsz) || 1250 (info.index >= VFIO_PCI_NUM_IRQS)) 1251 return -EINVAL; 1252 1253 ret = mbochs_get_irq_info(&info); 1254 if (ret) 1255 return ret; 1256 1257 if (copy_to_user((void __user *)arg, &info, minsz)) 1258 return -EFAULT; 1259 1260 return 0; 1261 } 1262 1263 case VFIO_DEVICE_QUERY_GFX_PLANE: 1264 { 1265 struct vfio_device_gfx_plane_info plane; 1266 1267 minsz = offsetofend(struct vfio_device_gfx_plane_info, 1268 region_index); 1269 1270 if (copy_from_user(&plane, (void __user *)arg, minsz)) 1271 return -EFAULT; 1272 1273 if (plane.argsz < minsz) 1274 return -EINVAL; 1275 1276 ret = mbochs_query_gfx_plane(mdev_state, &plane); 1277 if (ret) 1278 return ret; 1279 1280 if (copy_to_user((void __user *)arg, &plane, minsz)) 1281 return -EFAULT; 1282 1283 return 0; 1284 } 1285 1286 case VFIO_DEVICE_GET_GFX_DMABUF: 1287 { 1288 u32 dmabuf_id; 1289 1290 if (get_user(dmabuf_id, (__u32 __user *)arg)) 1291 return -EFAULT; 1292 1293 return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id); 1294 } 1295 1296 case VFIO_DEVICE_SET_IRQS: 1297 return -EINVAL; 1298 1299 case VFIO_DEVICE_RESET: 1300 return mbochs_reset(mdev_state); 1301 } 1302 return -ENOTTY; 1303 } 1304 1305 static void mbochs_close_device(struct vfio_device *vdev) 1306 { 1307 struct mdev_state *mdev_state = 1308 container_of(vdev, struct mdev_state, vdev); 1309 struct mbochs_dmabuf *dmabuf, *tmp; 1310 1311 mutex_lock(&mdev_state->ops_lock); 1312 1313 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) { 1314 list_del(&dmabuf->next); 1315 if (dmabuf->buf) { 1316 /* free in mbochs_release_dmabuf() */ 1317 dmabuf->unlinked = true; 1318 } else { 1319 kfree(dmabuf); 1320 } 1321 } 1322 mbochs_put_pages(mdev_state); 1323 1324 mutex_unlock(&mdev_state->ops_lock); 1325 } 1326 1327 static ssize_t 1328 memory_show(struct device *dev, struct device_attribute *attr, 1329 char *buf) 1330 { 1331 struct mdev_state *mdev_state = dev_get_drvdata(dev); 1332 1333 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes); 1334 } 1335 static DEVICE_ATTR_RO(memory); 1336 1337 static struct attribute *mdev_dev_attrs[] = { 1338 &dev_attr_memory.attr, 1339 NULL, 1340 }; 1341 1342 static const struct attribute_group mdev_dev_group = { 1343 .name = "vendor", 1344 .attrs = mdev_dev_attrs, 1345 }; 1346 1347 static const struct attribute_group *mdev_dev_groups[] = { 1348 &mdev_dev_group, 1349 NULL, 1350 }; 1351 1352 static ssize_t mbochs_show_description(struct mdev_type *mtype, char *buf) 1353 { 1354 struct mbochs_type *type = 1355 container_of(mtype, struct mbochs_type, type); 1356 1357 return sprintf(buf, "virtual display, %d MB video memory\n", 1358 type ? type->mbytes : 0); 1359 } 1360 1361 static unsigned int mbochs_get_available(struct mdev_type *mtype) 1362 { 1363 struct mbochs_type *type = 1364 container_of(mtype, struct mbochs_type, type); 1365 1366 return atomic_read(&mbochs_avail_mbytes) / type->mbytes; 1367 } 1368 1369 static const struct vfio_device_ops mbochs_dev_ops = { 1370 .close_device = mbochs_close_device, 1371 .init = mbochs_init_dev, 1372 .release = mbochs_release_dev, 1373 .read = mbochs_read, 1374 .write = mbochs_write, 1375 .ioctl = mbochs_ioctl, 1376 .mmap = mbochs_mmap, 1377 .bind_iommufd = vfio_iommufd_emulated_bind, 1378 .unbind_iommufd = vfio_iommufd_emulated_unbind, 1379 .attach_ioas = vfio_iommufd_emulated_attach_ioas, 1380 .detach_ioas = vfio_iommufd_emulated_detach_ioas, 1381 }; 1382 1383 static struct mdev_driver mbochs_driver = { 1384 .device_api = VFIO_DEVICE_API_PCI_STRING, 1385 .driver = { 1386 .name = "mbochs", 1387 .owner = THIS_MODULE, 1388 .mod_name = KBUILD_MODNAME, 1389 .dev_groups = mdev_dev_groups, 1390 }, 1391 .probe = mbochs_probe, 1392 .remove = mbochs_remove, 1393 .get_available = mbochs_get_available, 1394 .show_description = mbochs_show_description, 1395 }; 1396 1397 static const struct file_operations vd_fops = { 1398 .owner = THIS_MODULE, 1399 }; 1400 1401 static void mbochs_device_release(struct device *dev) 1402 { 1403 /* nothing */ 1404 } 1405 1406 static int __init mbochs_dev_init(void) 1407 { 1408 int ret = 0; 1409 1410 atomic_set(&mbochs_avail_mbytes, max_mbytes); 1411 1412 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME); 1413 if (ret < 0) { 1414 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret); 1415 return ret; 1416 } 1417 cdev_init(&mbochs_cdev, &vd_fops); 1418 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1); 1419 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt)); 1420 1421 ret = mdev_register_driver(&mbochs_driver); 1422 if (ret) 1423 goto err_cdev; 1424 1425 mbochs_class = class_create(MBOCHS_CLASS_NAME); 1426 if (IS_ERR(mbochs_class)) { 1427 pr_err("Error: failed to register mbochs_dev class\n"); 1428 ret = PTR_ERR(mbochs_class); 1429 goto err_driver; 1430 } 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_destroy(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_destroy(mbochs_class); 1470 mbochs_class = NULL; 1471 } 1472 1473 MODULE_IMPORT_NS(DMA_BUF); 1474 module_init(mbochs_dev_init) 1475 module_exit(mbochs_dev_exit) 1476