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 const char *name; 105 u32 mbytes; 106 u32 max_x; 107 u32 max_y; 108 } mbochs_types[] = { 109 { 110 .type.sysfs_name = MBOCHS_TYPE_1, 111 .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 .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 .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 struct class *mbochs_class; 138 static struct cdev mbochs_cdev; 139 static struct device mbochs_dev; 140 static struct mdev_parent mbochs_parent; 141 static atomic_t mbochs_avail_mbytes; 142 static const struct vfio_device_ops mbochs_dev_ops; 143 144 struct vfio_region_info_ext { 145 struct vfio_region_info base; 146 struct vfio_region_info_cap_type type; 147 }; 148 149 struct mbochs_mode { 150 u32 drm_format; 151 u32 bytepp; 152 u32 width; 153 u32 height; 154 u32 stride; 155 u32 __pad; 156 u64 offset; 157 u64 size; 158 }; 159 160 struct mbochs_dmabuf { 161 struct mbochs_mode mode; 162 u32 id; 163 struct page **pages; 164 pgoff_t pagecount; 165 struct dma_buf *buf; 166 struct mdev_state *mdev_state; 167 struct list_head next; 168 bool unlinked; 169 }; 170 171 /* State of each mdev device */ 172 struct mdev_state { 173 struct vfio_device vdev; 174 u8 *vconfig; 175 u64 bar_mask[3]; 176 u32 memory_bar_mask; 177 struct mutex ops_lock; 178 struct mdev_device *mdev; 179 180 const struct mbochs_type *type; 181 u16 vbe[VBE_DISPI_INDEX_COUNT]; 182 u64 memsize; 183 struct page **pages; 184 pgoff_t pagecount; 185 struct vfio_region_gfx_edid edid_regs; 186 u8 edid_blob[0x400]; 187 188 struct list_head dmabufs; 189 u32 active_id; 190 u32 next_id; 191 }; 192 193 static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = { 194 [VBE_DISPI_INDEX_ID] = "id", 195 [VBE_DISPI_INDEX_XRES] = "xres", 196 [VBE_DISPI_INDEX_YRES] = "yres", 197 [VBE_DISPI_INDEX_BPP] = "bpp", 198 [VBE_DISPI_INDEX_ENABLE] = "enable", 199 [VBE_DISPI_INDEX_BANK] = "bank", 200 [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width", 201 [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height", 202 [VBE_DISPI_INDEX_X_OFFSET] = "x-offset", 203 [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset", 204 [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem", 205 }; 206 207 static const char *vbe_name(u32 index) 208 { 209 if (index < ARRAY_SIZE(vbe_name_list)) 210 return vbe_name_list[index]; 211 return "(invalid)"; 212 } 213 214 static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 215 pgoff_t pgoff); 216 static struct page *mbochs_get_page(struct mdev_state *mdev_state, 217 pgoff_t pgoff); 218 219 static void mbochs_create_config_space(struct mdev_state *mdev_state) 220 { 221 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID], 222 0x1234); 223 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID], 224 0x1111); 225 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID], 226 PCI_SUBVENDOR_ID_REDHAT_QUMRANET); 227 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID], 228 PCI_SUBDEVICE_ID_QEMU); 229 230 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND], 231 PCI_COMMAND_IO | PCI_COMMAND_MEMORY); 232 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE], 233 PCI_CLASS_DISPLAY_OTHER); 234 mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01; 235 236 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0], 237 PCI_BASE_ADDRESS_SPACE_MEMORY | 238 PCI_BASE_ADDRESS_MEM_TYPE_32 | 239 PCI_BASE_ADDRESS_MEM_PREFETCH); 240 mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1; 241 242 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2], 243 PCI_BASE_ADDRESS_SPACE_MEMORY | 244 PCI_BASE_ADDRESS_MEM_TYPE_32); 245 mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1; 246 } 247 248 static int mbochs_check_framebuffer(struct mdev_state *mdev_state, 249 struct mbochs_mode *mode) 250 { 251 struct device *dev = mdev_dev(mdev_state->mdev); 252 u16 *vbe = mdev_state->vbe; 253 u32 virt_width; 254 255 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 256 257 if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) 258 goto nofb; 259 260 memset(mode, 0, sizeof(*mode)); 261 switch (vbe[VBE_DISPI_INDEX_BPP]) { 262 case 32: 263 mode->drm_format = DRM_FORMAT_XRGB8888; 264 mode->bytepp = 4; 265 break; 266 default: 267 dev_info_ratelimited(dev, "%s: bpp %d not supported\n", 268 __func__, vbe[VBE_DISPI_INDEX_BPP]); 269 goto nofb; 270 } 271 272 mode->width = vbe[VBE_DISPI_INDEX_XRES]; 273 mode->height = vbe[VBE_DISPI_INDEX_YRES]; 274 virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH]; 275 if (virt_width < mode->width) 276 virt_width = mode->width; 277 mode->stride = virt_width * mode->bytepp; 278 mode->size = (u64)mode->stride * mode->height; 279 mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp + 280 (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride); 281 282 if (mode->width < 64 || mode->height < 64) { 283 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n", 284 __func__, mode->width, mode->height); 285 goto nofb; 286 } 287 if (mode->offset + mode->size > mdev_state->memsize) { 288 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n", 289 __func__); 290 goto nofb; 291 } 292 293 return 0; 294 295 nofb: 296 memset(mode, 0, sizeof(*mode)); 297 return -EINVAL; 298 } 299 300 static bool mbochs_modes_equal(struct mbochs_mode *mode1, 301 struct mbochs_mode *mode2) 302 { 303 return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0; 304 } 305 306 static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset, 307 char *buf, u32 count) 308 { 309 struct device *dev = mdev_dev(mdev_state->mdev); 310 int index = (offset - PCI_BASE_ADDRESS_0) / 0x04; 311 u32 cfg_addr; 312 313 switch (offset) { 314 case PCI_BASE_ADDRESS_0: 315 case PCI_BASE_ADDRESS_2: 316 cfg_addr = *(u32 *)buf; 317 318 if (cfg_addr == 0xffffffff) { 319 cfg_addr = (cfg_addr & mdev_state->bar_mask[index]); 320 } else { 321 cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK; 322 if (cfg_addr) 323 dev_info(dev, "BAR #%d @ 0x%x\n", 324 index, cfg_addr); 325 } 326 327 cfg_addr |= (mdev_state->vconfig[offset] & 328 ~PCI_BASE_ADDRESS_MEM_MASK); 329 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr); 330 break; 331 } 332 } 333 334 static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset, 335 char *buf, u32 count) 336 { 337 struct device *dev = mdev_dev(mdev_state->mdev); 338 int index; 339 u16 reg16; 340 341 switch (offset) { 342 case 0x400 ... 0x41f: /* vga ioports remapped */ 343 goto unhandled; 344 case 0x500 ... 0x515: /* bochs dispi interface */ 345 if (count != 2) 346 goto unhandled; 347 index = (offset - 0x500) / 2; 348 reg16 = *(u16 *)buf; 349 if (index < ARRAY_SIZE(mdev_state->vbe)) 350 mdev_state->vbe[index] = reg16; 351 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n", 352 __func__, index, reg16, vbe_name(index)); 353 break; 354 case 0x600 ... 0x607: /* qemu extended regs */ 355 goto unhandled; 356 default: 357 unhandled: 358 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", 359 __func__, offset, count); 360 break; 361 } 362 } 363 364 static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset, 365 char *buf, u32 count) 366 { 367 struct device *dev = mdev_dev(mdev_state->mdev); 368 struct vfio_region_gfx_edid *edid; 369 u16 reg16 = 0; 370 int index; 371 372 switch (offset) { 373 case 0x000 ... 0x3ff: /* edid block */ 374 edid = &mdev_state->edid_regs; 375 if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP || 376 offset >= edid->edid_size) { 377 memset(buf, 0, count); 378 break; 379 } 380 memcpy(buf, mdev_state->edid_blob + offset, count); 381 break; 382 case 0x500 ... 0x515: /* bochs dispi interface */ 383 if (count != 2) 384 goto unhandled; 385 index = (offset - 0x500) / 2; 386 if (index < ARRAY_SIZE(mdev_state->vbe)) 387 reg16 = mdev_state->vbe[index]; 388 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n", 389 __func__, index, reg16, vbe_name(index)); 390 *(u16 *)buf = reg16; 391 break; 392 default: 393 unhandled: 394 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", 395 __func__, offset, count); 396 memset(buf, 0, count); 397 break; 398 } 399 } 400 401 static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset, 402 char *buf, u32 count, bool is_write) 403 { 404 char *regs = (void *)&mdev_state->edid_regs; 405 406 if (offset + count > sizeof(mdev_state->edid_regs)) 407 return; 408 if (count != 4) 409 return; 410 if (offset % 4) 411 return; 412 413 if (is_write) { 414 switch (offset) { 415 case offsetof(struct vfio_region_gfx_edid, link_state): 416 case offsetof(struct vfio_region_gfx_edid, edid_size): 417 memcpy(regs + offset, buf, count); 418 break; 419 default: 420 /* read-only regs */ 421 break; 422 } 423 } else { 424 memcpy(buf, regs + offset, count); 425 } 426 } 427 428 static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset, 429 char *buf, u32 count, bool is_write) 430 { 431 if (offset + count > mdev_state->edid_regs.edid_max_size) 432 return; 433 if (is_write) 434 memcpy(mdev_state->edid_blob + offset, buf, count); 435 else 436 memcpy(buf, mdev_state->edid_blob + offset, count); 437 } 438 439 static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf, 440 size_t count, loff_t pos, bool is_write) 441 { 442 struct page *pg; 443 loff_t poff; 444 char *map; 445 int ret = 0; 446 447 mutex_lock(&mdev_state->ops_lock); 448 449 if (pos < MBOCHS_CONFIG_SPACE_SIZE) { 450 if (is_write) 451 handle_pci_cfg_write(mdev_state, pos, buf, count); 452 else 453 memcpy(buf, (mdev_state->vconfig + pos), count); 454 455 } else if (pos >= MBOCHS_MMIO_BAR_OFFSET && 456 pos + count <= (MBOCHS_MMIO_BAR_OFFSET + 457 MBOCHS_MMIO_BAR_SIZE)) { 458 pos -= MBOCHS_MMIO_BAR_OFFSET; 459 if (is_write) 460 handle_mmio_write(mdev_state, pos, buf, count); 461 else 462 handle_mmio_read(mdev_state, pos, buf, count); 463 464 } else if (pos >= MBOCHS_EDID_OFFSET && 465 pos + count <= (MBOCHS_EDID_OFFSET + 466 MBOCHS_EDID_SIZE)) { 467 pos -= MBOCHS_EDID_OFFSET; 468 if (pos < MBOCHS_EDID_BLOB_OFFSET) { 469 handle_edid_regs(mdev_state, pos, buf, count, is_write); 470 } else { 471 pos -= MBOCHS_EDID_BLOB_OFFSET; 472 handle_edid_blob(mdev_state, pos, buf, count, is_write); 473 } 474 475 } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET && 476 pos + count <= 477 MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) { 478 pos -= MBOCHS_MMIO_BAR_OFFSET; 479 poff = pos & ~PAGE_MASK; 480 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT); 481 map = kmap(pg); 482 if (is_write) 483 memcpy(map + poff, buf, count); 484 else 485 memcpy(buf, map + poff, count); 486 kunmap(pg); 487 put_page(pg); 488 489 } else { 490 dev_dbg(mdev_state->vdev.dev, "%s: %s @0x%llx (unhandled)\n", 491 __func__, is_write ? "WR" : "RD", pos); 492 ret = -1; 493 goto accessfailed; 494 } 495 496 ret = count; 497 498 499 accessfailed: 500 mutex_unlock(&mdev_state->ops_lock); 501 502 return ret; 503 } 504 505 static int mbochs_reset(struct mdev_state *mdev_state) 506 { 507 u32 size64k = mdev_state->memsize / (64 * 1024); 508 int i; 509 510 for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++) 511 mdev_state->vbe[i] = 0; 512 mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5; 513 mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k; 514 return 0; 515 } 516 517 static int mbochs_init_dev(struct vfio_device *vdev) 518 { 519 struct mdev_state *mdev_state = 520 container_of(vdev, struct mdev_state, vdev); 521 struct mdev_device *mdev = to_mdev_device(vdev->dev); 522 struct mbochs_type *type = 523 container_of(mdev->type, struct mbochs_type, type); 524 int avail_mbytes = atomic_read(&mbochs_avail_mbytes); 525 int ret = -ENOMEM; 526 527 do { 528 if (avail_mbytes < type->mbytes) 529 return -ENOSPC; 530 } while (!atomic_try_cmpxchg(&mbochs_avail_mbytes, &avail_mbytes, 531 avail_mbytes - type->mbytes)); 532 533 mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL); 534 if (!mdev_state->vconfig) 535 goto err_avail; 536 537 mdev_state->memsize = type->mbytes * 1024 * 1024; 538 mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT; 539 mdev_state->pages = kcalloc(mdev_state->pagecount, 540 sizeof(struct page *), 541 GFP_KERNEL); 542 if (!mdev_state->pages) 543 goto err_vconfig; 544 545 mutex_init(&mdev_state->ops_lock); 546 mdev_state->mdev = mdev; 547 INIT_LIST_HEAD(&mdev_state->dmabufs); 548 mdev_state->next_id = 1; 549 550 mdev_state->type = type; 551 mdev_state->edid_regs.max_xres = type->max_x; 552 mdev_state->edid_regs.max_yres = type->max_y; 553 mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET; 554 mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob); 555 mbochs_create_config_space(mdev_state); 556 mbochs_reset(mdev_state); 557 558 dev_info(vdev->dev, "%s: %s, %d MB, %ld pages\n", __func__, 559 type->name, type->mbytes, mdev_state->pagecount); 560 return 0; 561 562 err_vconfig: 563 kfree(mdev_state->vconfig); 564 err_avail: 565 atomic_add(type->mbytes, &mbochs_avail_mbytes); 566 return ret; 567 } 568 569 static int mbochs_probe(struct mdev_device *mdev) 570 { 571 struct mdev_state *mdev_state; 572 int ret = -ENOMEM; 573 574 mdev_state = vfio_alloc_device(mdev_state, vdev, &mdev->dev, 575 &mbochs_dev_ops); 576 if (IS_ERR(mdev_state)) 577 return PTR_ERR(mdev_state); 578 579 ret = vfio_register_emulated_iommu_dev(&mdev_state->vdev); 580 if (ret) 581 goto err_put_vdev; 582 dev_set_drvdata(&mdev->dev, mdev_state); 583 return 0; 584 585 err_put_vdev: 586 vfio_put_device(&mdev_state->vdev); 587 return ret; 588 } 589 590 static void mbochs_release_dev(struct vfio_device *vdev) 591 { 592 struct mdev_state *mdev_state = 593 container_of(vdev, struct mdev_state, vdev); 594 595 atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes); 596 kfree(mdev_state->pages); 597 kfree(mdev_state->vconfig); 598 vfio_free_device(vdev); 599 } 600 601 static void mbochs_remove(struct mdev_device *mdev) 602 { 603 struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev); 604 605 vfio_unregister_group_dev(&mdev_state->vdev); 606 vfio_put_device(&mdev_state->vdev); 607 } 608 609 static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf, 610 size_t count, loff_t *ppos) 611 { 612 struct mdev_state *mdev_state = 613 container_of(vdev, struct mdev_state, vdev); 614 unsigned int done = 0; 615 int ret; 616 617 while (count) { 618 size_t filled; 619 620 if (count >= 4 && !(*ppos % 4)) { 621 u32 val; 622 623 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 624 *ppos, false); 625 if (ret <= 0) 626 goto read_err; 627 628 if (copy_to_user(buf, &val, sizeof(val))) 629 goto read_err; 630 631 filled = 4; 632 } else if (count >= 2 && !(*ppos % 2)) { 633 u16 val; 634 635 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 636 *ppos, false); 637 if (ret <= 0) 638 goto read_err; 639 640 if (copy_to_user(buf, &val, sizeof(val))) 641 goto read_err; 642 643 filled = 2; 644 } else { 645 u8 val; 646 647 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 648 *ppos, false); 649 if (ret <= 0) 650 goto read_err; 651 652 if (copy_to_user(buf, &val, sizeof(val))) 653 goto read_err; 654 655 filled = 1; 656 } 657 658 count -= filled; 659 done += filled; 660 *ppos += filled; 661 buf += filled; 662 } 663 664 return done; 665 666 read_err: 667 return -EFAULT; 668 } 669 670 static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf, 671 size_t count, loff_t *ppos) 672 { 673 struct mdev_state *mdev_state = 674 container_of(vdev, struct mdev_state, vdev); 675 unsigned int done = 0; 676 int ret; 677 678 while (count) { 679 size_t filled; 680 681 if (count >= 4 && !(*ppos % 4)) { 682 u32 val; 683 684 if (copy_from_user(&val, buf, sizeof(val))) 685 goto write_err; 686 687 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 688 *ppos, true); 689 if (ret <= 0) 690 goto write_err; 691 692 filled = 4; 693 } else if (count >= 2 && !(*ppos % 2)) { 694 u16 val; 695 696 if (copy_from_user(&val, buf, sizeof(val))) 697 goto write_err; 698 699 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 700 *ppos, true); 701 if (ret <= 0) 702 goto write_err; 703 704 filled = 2; 705 } else { 706 u8 val; 707 708 if (copy_from_user(&val, buf, sizeof(val))) 709 goto write_err; 710 711 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 712 *ppos, true); 713 if (ret <= 0) 714 goto write_err; 715 716 filled = 1; 717 } 718 count -= filled; 719 done += filled; 720 *ppos += filled; 721 buf += filled; 722 } 723 724 return done; 725 write_err: 726 return -EFAULT; 727 } 728 729 static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 730 pgoff_t pgoff) 731 { 732 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 733 734 if (!mdev_state->pages[pgoff]) { 735 mdev_state->pages[pgoff] = 736 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0); 737 if (!mdev_state->pages[pgoff]) 738 return NULL; 739 } 740 741 get_page(mdev_state->pages[pgoff]); 742 return mdev_state->pages[pgoff]; 743 } 744 745 static struct page *mbochs_get_page(struct mdev_state *mdev_state, 746 pgoff_t pgoff) 747 { 748 struct page *page; 749 750 if (WARN_ON(pgoff >= mdev_state->pagecount)) 751 return NULL; 752 753 mutex_lock(&mdev_state->ops_lock); 754 page = __mbochs_get_page(mdev_state, pgoff); 755 mutex_unlock(&mdev_state->ops_lock); 756 757 return page; 758 } 759 760 static void mbochs_put_pages(struct mdev_state *mdev_state) 761 { 762 struct device *dev = mdev_dev(mdev_state->mdev); 763 int i, count = 0; 764 765 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 766 767 for (i = 0; i < mdev_state->pagecount; i++) { 768 if (!mdev_state->pages[i]) 769 continue; 770 put_page(mdev_state->pages[i]); 771 mdev_state->pages[i] = NULL; 772 count++; 773 } 774 dev_dbg(dev, "%s: %d pages released\n", __func__, count); 775 } 776 777 static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf) 778 { 779 struct vm_area_struct *vma = vmf->vma; 780 struct mdev_state *mdev_state = vma->vm_private_data; 781 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 782 783 if (page_offset >= mdev_state->pagecount) 784 return VM_FAULT_SIGBUS; 785 786 vmf->page = mbochs_get_page(mdev_state, page_offset); 787 if (!vmf->page) 788 return VM_FAULT_SIGBUS; 789 790 return 0; 791 } 792 793 static const struct vm_operations_struct mbochs_region_vm_ops = { 794 .fault = mbochs_region_vm_fault, 795 }; 796 797 static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma) 798 { 799 struct mdev_state *mdev_state = 800 container_of(vdev, struct mdev_state, vdev); 801 802 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT) 803 return -EINVAL; 804 if (vma->vm_end < vma->vm_start) 805 return -EINVAL; 806 if (vma->vm_end - vma->vm_start > mdev_state->memsize) 807 return -EINVAL; 808 if ((vma->vm_flags & VM_SHARED) == 0) 809 return -EINVAL; 810 811 vma->vm_ops = &mbochs_region_vm_ops; 812 vma->vm_private_data = mdev_state; 813 return 0; 814 } 815 816 static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf) 817 { 818 struct vm_area_struct *vma = vmf->vma; 819 struct mbochs_dmabuf *dmabuf = vma->vm_private_data; 820 821 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount)) 822 return VM_FAULT_SIGBUS; 823 824 vmf->page = dmabuf->pages[vmf->pgoff]; 825 get_page(vmf->page); 826 return 0; 827 } 828 829 static const struct vm_operations_struct mbochs_dmabuf_vm_ops = { 830 .fault = mbochs_dmabuf_vm_fault, 831 }; 832 833 static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma) 834 { 835 struct mbochs_dmabuf *dmabuf = buf->priv; 836 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 837 838 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 839 840 if ((vma->vm_flags & VM_SHARED) == 0) 841 return -EINVAL; 842 843 vma->vm_ops = &mbochs_dmabuf_vm_ops; 844 vma->vm_private_data = dmabuf; 845 return 0; 846 } 847 848 static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf, 849 const char *prefix) 850 { 851 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 852 u32 fourcc = dmabuf->mode.drm_format; 853 854 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n", 855 prefix, dmabuf->id, 856 fourcc ? ((fourcc >> 0) & 0xff) : '-', 857 fourcc ? ((fourcc >> 8) & 0xff) : '-', 858 fourcc ? ((fourcc >> 16) & 0xff) : '-', 859 fourcc ? ((fourcc >> 24) & 0xff) : '-', 860 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride, 861 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount); 862 } 863 864 static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at, 865 enum dma_data_direction direction) 866 { 867 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 868 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 869 struct sg_table *sg; 870 871 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 872 873 sg = kzalloc(sizeof(*sg), GFP_KERNEL); 874 if (!sg) 875 goto err1; 876 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount, 877 0, dmabuf->mode.size, GFP_KERNEL) < 0) 878 goto err2; 879 if (dma_map_sgtable(at->dev, sg, direction, 0)) 880 goto err3; 881 882 return sg; 883 884 err3: 885 sg_free_table(sg); 886 err2: 887 kfree(sg); 888 err1: 889 return ERR_PTR(-ENOMEM); 890 } 891 892 static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at, 893 struct sg_table *sg, 894 enum dma_data_direction direction) 895 { 896 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 897 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 898 899 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 900 901 dma_unmap_sgtable(at->dev, sg, direction, 0); 902 sg_free_table(sg); 903 kfree(sg); 904 } 905 906 static void mbochs_release_dmabuf(struct dma_buf *buf) 907 { 908 struct mbochs_dmabuf *dmabuf = buf->priv; 909 struct mdev_state *mdev_state = dmabuf->mdev_state; 910 struct device *dev = mdev_dev(mdev_state->mdev); 911 pgoff_t pg; 912 913 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 914 915 for (pg = 0; pg < dmabuf->pagecount; pg++) 916 put_page(dmabuf->pages[pg]); 917 918 mutex_lock(&mdev_state->ops_lock); 919 dmabuf->buf = NULL; 920 if (dmabuf->unlinked) 921 kfree(dmabuf); 922 mutex_unlock(&mdev_state->ops_lock); 923 } 924 925 static struct dma_buf_ops mbochs_dmabuf_ops = { 926 .map_dma_buf = mbochs_map_dmabuf, 927 .unmap_dma_buf = mbochs_unmap_dmabuf, 928 .release = mbochs_release_dmabuf, 929 .mmap = mbochs_mmap_dmabuf, 930 }; 931 932 static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state, 933 struct mbochs_mode *mode) 934 { 935 struct mbochs_dmabuf *dmabuf; 936 pgoff_t page_offset, pg; 937 938 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 939 940 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL); 941 if (!dmabuf) 942 return NULL; 943 944 dmabuf->mode = *mode; 945 dmabuf->id = mdev_state->next_id++; 946 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE); 947 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *), 948 GFP_KERNEL); 949 if (!dmabuf->pages) 950 goto err_free_dmabuf; 951 952 page_offset = dmabuf->mode.offset >> PAGE_SHIFT; 953 for (pg = 0; pg < dmabuf->pagecount; pg++) { 954 dmabuf->pages[pg] = __mbochs_get_page(mdev_state, 955 page_offset + pg); 956 if (!dmabuf->pages[pg]) 957 goto err_free_pages; 958 } 959 960 dmabuf->mdev_state = mdev_state; 961 list_add(&dmabuf->next, &mdev_state->dmabufs); 962 963 mbochs_print_dmabuf(dmabuf, __func__); 964 return dmabuf; 965 966 err_free_pages: 967 while (pg > 0) 968 put_page(dmabuf->pages[--pg]); 969 kfree(dmabuf->pages); 970 err_free_dmabuf: 971 kfree(dmabuf); 972 return NULL; 973 } 974 975 static struct mbochs_dmabuf * 976 mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state, 977 struct mbochs_mode *mode) 978 { 979 struct mbochs_dmabuf *dmabuf; 980 981 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 982 983 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 984 if (mbochs_modes_equal(&dmabuf->mode, mode)) 985 return dmabuf; 986 987 return NULL; 988 } 989 990 static struct mbochs_dmabuf * 991 mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id) 992 { 993 struct mbochs_dmabuf *dmabuf; 994 995 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 996 997 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 998 if (dmabuf->id == id) 999 return dmabuf; 1000 1001 return NULL; 1002 } 1003 1004 static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf) 1005 { 1006 struct mdev_state *mdev_state = dmabuf->mdev_state; 1007 struct device *dev = mdev_state->vdev.dev; 1008 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 1009 struct dma_buf *buf; 1010 1011 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 1012 1013 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) { 1014 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n", 1015 __func__); 1016 return -EINVAL; 1017 } 1018 1019 exp_info.ops = &mbochs_dmabuf_ops; 1020 exp_info.size = dmabuf->mode.size; 1021 exp_info.priv = dmabuf; 1022 1023 buf = dma_buf_export(&exp_info); 1024 if (IS_ERR(buf)) { 1025 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n", 1026 __func__, PTR_ERR(buf)); 1027 return PTR_ERR(buf); 1028 } 1029 1030 dmabuf->buf = buf; 1031 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 1032 return 0; 1033 } 1034 1035 static int mbochs_get_region_info(struct mdev_state *mdev_state, 1036 struct vfio_region_info_ext *ext) 1037 { 1038 struct vfio_region_info *region_info = &ext->base; 1039 1040 if (region_info->index >= MBOCHS_NUM_REGIONS) 1041 return -EINVAL; 1042 1043 switch (region_info->index) { 1044 case VFIO_PCI_CONFIG_REGION_INDEX: 1045 region_info->offset = 0; 1046 region_info->size = MBOCHS_CONFIG_SPACE_SIZE; 1047 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1048 VFIO_REGION_INFO_FLAG_WRITE); 1049 break; 1050 case VFIO_PCI_BAR0_REGION_INDEX: 1051 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET; 1052 region_info->size = mdev_state->memsize; 1053 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1054 VFIO_REGION_INFO_FLAG_WRITE | 1055 VFIO_REGION_INFO_FLAG_MMAP); 1056 break; 1057 case VFIO_PCI_BAR2_REGION_INDEX: 1058 region_info->offset = MBOCHS_MMIO_BAR_OFFSET; 1059 region_info->size = MBOCHS_MMIO_BAR_SIZE; 1060 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1061 VFIO_REGION_INFO_FLAG_WRITE); 1062 break; 1063 case MBOCHS_EDID_REGION_INDEX: 1064 ext->base.argsz = sizeof(*ext); 1065 ext->base.offset = MBOCHS_EDID_OFFSET; 1066 ext->base.size = MBOCHS_EDID_SIZE; 1067 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ | 1068 VFIO_REGION_INFO_FLAG_WRITE | 1069 VFIO_REGION_INFO_FLAG_CAPS); 1070 ext->base.cap_offset = offsetof(typeof(*ext), type); 1071 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE; 1072 ext->type.header.version = 1; 1073 ext->type.header.next = 0; 1074 ext->type.type = VFIO_REGION_TYPE_GFX; 1075 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID; 1076 break; 1077 default: 1078 region_info->size = 0; 1079 region_info->offset = 0; 1080 region_info->flags = 0; 1081 } 1082 1083 return 0; 1084 } 1085 1086 static int mbochs_get_irq_info(struct vfio_irq_info *irq_info) 1087 { 1088 irq_info->count = 0; 1089 return 0; 1090 } 1091 1092 static int mbochs_get_device_info(struct vfio_device_info *dev_info) 1093 { 1094 dev_info->flags = VFIO_DEVICE_FLAGS_PCI; 1095 dev_info->num_regions = MBOCHS_NUM_REGIONS; 1096 dev_info->num_irqs = VFIO_PCI_NUM_IRQS; 1097 return 0; 1098 } 1099 1100 static int mbochs_query_gfx_plane(struct mdev_state *mdev_state, 1101 struct vfio_device_gfx_plane_info *plane) 1102 { 1103 struct mbochs_dmabuf *dmabuf; 1104 struct mbochs_mode mode; 1105 int ret; 1106 1107 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) { 1108 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE | 1109 VFIO_GFX_PLANE_TYPE_DMABUF)) 1110 return 0; 1111 return -EINVAL; 1112 } 1113 1114 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF) 1115 return -EINVAL; 1116 1117 plane->drm_format_mod = 0; 1118 plane->x_pos = 0; 1119 plane->y_pos = 0; 1120 plane->x_hot = 0; 1121 plane->y_hot = 0; 1122 1123 mutex_lock(&mdev_state->ops_lock); 1124 1125 ret = -EINVAL; 1126 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY) 1127 ret = mbochs_check_framebuffer(mdev_state, &mode); 1128 if (ret < 0) { 1129 plane->drm_format = 0; 1130 plane->width = 0; 1131 plane->height = 0; 1132 plane->stride = 0; 1133 plane->size = 0; 1134 plane->dmabuf_id = 0; 1135 goto done; 1136 } 1137 1138 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode); 1139 if (!dmabuf) 1140 mbochs_dmabuf_alloc(mdev_state, &mode); 1141 if (!dmabuf) { 1142 mutex_unlock(&mdev_state->ops_lock); 1143 return -ENOMEM; 1144 } 1145 1146 plane->drm_format = dmabuf->mode.drm_format; 1147 plane->width = dmabuf->mode.width; 1148 plane->height = dmabuf->mode.height; 1149 plane->stride = dmabuf->mode.stride; 1150 plane->size = dmabuf->mode.size; 1151 plane->dmabuf_id = dmabuf->id; 1152 1153 done: 1154 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY && 1155 mdev_state->active_id != plane->dmabuf_id) { 1156 dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n", 1157 __func__, mdev_state->active_id, plane->dmabuf_id); 1158 mdev_state->active_id = plane->dmabuf_id; 1159 } 1160 mutex_unlock(&mdev_state->ops_lock); 1161 return 0; 1162 } 1163 1164 static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id) 1165 { 1166 struct mbochs_dmabuf *dmabuf; 1167 1168 mutex_lock(&mdev_state->ops_lock); 1169 1170 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id); 1171 if (!dmabuf) { 1172 mutex_unlock(&mdev_state->ops_lock); 1173 return -ENOENT; 1174 } 1175 1176 if (!dmabuf->buf) 1177 mbochs_dmabuf_export(dmabuf); 1178 1179 mutex_unlock(&mdev_state->ops_lock); 1180 1181 if (!dmabuf->buf) 1182 return -EINVAL; 1183 1184 return dma_buf_fd(dmabuf->buf, 0); 1185 } 1186 1187 static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd, 1188 unsigned long arg) 1189 { 1190 struct mdev_state *mdev_state = 1191 container_of(vdev, struct mdev_state, vdev); 1192 int ret = 0; 1193 unsigned long minsz, outsz; 1194 1195 switch (cmd) { 1196 case VFIO_DEVICE_GET_INFO: 1197 { 1198 struct vfio_device_info info; 1199 1200 minsz = offsetofend(struct vfio_device_info, num_irqs); 1201 1202 if (copy_from_user(&info, (void __user *)arg, minsz)) 1203 return -EFAULT; 1204 1205 if (info.argsz < minsz) 1206 return -EINVAL; 1207 1208 ret = mbochs_get_device_info(&info); 1209 if (ret) 1210 return ret; 1211 1212 if (copy_to_user((void __user *)arg, &info, minsz)) 1213 return -EFAULT; 1214 1215 return 0; 1216 } 1217 case VFIO_DEVICE_GET_REGION_INFO: 1218 { 1219 struct vfio_region_info_ext info; 1220 1221 minsz = offsetofend(typeof(info), base.offset); 1222 1223 if (copy_from_user(&info, (void __user *)arg, minsz)) 1224 return -EFAULT; 1225 1226 outsz = info.base.argsz; 1227 if (outsz < minsz) 1228 return -EINVAL; 1229 if (outsz > sizeof(info)) 1230 return -EINVAL; 1231 1232 ret = mbochs_get_region_info(mdev_state, &info); 1233 if (ret) 1234 return ret; 1235 1236 if (copy_to_user((void __user *)arg, &info, outsz)) 1237 return -EFAULT; 1238 1239 return 0; 1240 } 1241 1242 case VFIO_DEVICE_GET_IRQ_INFO: 1243 { 1244 struct vfio_irq_info info; 1245 1246 minsz = offsetofend(struct vfio_irq_info, count); 1247 1248 if (copy_from_user(&info, (void __user *)arg, minsz)) 1249 return -EFAULT; 1250 1251 if ((info.argsz < minsz) || 1252 (info.index >= VFIO_PCI_NUM_IRQS)) 1253 return -EINVAL; 1254 1255 ret = mbochs_get_irq_info(&info); 1256 if (ret) 1257 return ret; 1258 1259 if (copy_to_user((void __user *)arg, &info, minsz)) 1260 return -EFAULT; 1261 1262 return 0; 1263 } 1264 1265 case VFIO_DEVICE_QUERY_GFX_PLANE: 1266 { 1267 struct vfio_device_gfx_plane_info plane; 1268 1269 minsz = offsetofend(struct vfio_device_gfx_plane_info, 1270 region_index); 1271 1272 if (copy_from_user(&plane, (void __user *)arg, minsz)) 1273 return -EFAULT; 1274 1275 if (plane.argsz < minsz) 1276 return -EINVAL; 1277 1278 ret = mbochs_query_gfx_plane(mdev_state, &plane); 1279 if (ret) 1280 return ret; 1281 1282 if (copy_to_user((void __user *)arg, &plane, minsz)) 1283 return -EFAULT; 1284 1285 return 0; 1286 } 1287 1288 case VFIO_DEVICE_GET_GFX_DMABUF: 1289 { 1290 u32 dmabuf_id; 1291 1292 if (get_user(dmabuf_id, (__u32 __user *)arg)) 1293 return -EFAULT; 1294 1295 return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id); 1296 } 1297 1298 case VFIO_DEVICE_SET_IRQS: 1299 return -EINVAL; 1300 1301 case VFIO_DEVICE_RESET: 1302 return mbochs_reset(mdev_state); 1303 } 1304 return -ENOTTY; 1305 } 1306 1307 static void mbochs_close_device(struct vfio_device *vdev) 1308 { 1309 struct mdev_state *mdev_state = 1310 container_of(vdev, struct mdev_state, vdev); 1311 struct mbochs_dmabuf *dmabuf, *tmp; 1312 1313 mutex_lock(&mdev_state->ops_lock); 1314 1315 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) { 1316 list_del(&dmabuf->next); 1317 if (dmabuf->buf) { 1318 /* free in mbochs_release_dmabuf() */ 1319 dmabuf->unlinked = true; 1320 } else { 1321 kfree(dmabuf); 1322 } 1323 } 1324 mbochs_put_pages(mdev_state); 1325 1326 mutex_unlock(&mdev_state->ops_lock); 1327 } 1328 1329 static ssize_t 1330 memory_show(struct device *dev, struct device_attribute *attr, 1331 char *buf) 1332 { 1333 struct mdev_state *mdev_state = dev_get_drvdata(dev); 1334 1335 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes); 1336 } 1337 static DEVICE_ATTR_RO(memory); 1338 1339 static struct attribute *mdev_dev_attrs[] = { 1340 &dev_attr_memory.attr, 1341 NULL, 1342 }; 1343 1344 static const struct attribute_group mdev_dev_group = { 1345 .name = "vendor", 1346 .attrs = mdev_dev_attrs, 1347 }; 1348 1349 static const struct attribute_group *mdev_dev_groups[] = { 1350 &mdev_dev_group, 1351 NULL, 1352 }; 1353 1354 static ssize_t name_show(struct mdev_type *mtype, 1355 struct mdev_type_attribute *attr, char *buf) 1356 { 1357 struct mbochs_type *type = 1358 container_of(mtype, struct mbochs_type, type); 1359 1360 return sprintf(buf, "%s\n", type->name); 1361 } 1362 static MDEV_TYPE_ATTR_RO(name); 1363 1364 static ssize_t description_show(struct mdev_type *mtype, 1365 struct mdev_type_attribute *attr, char *buf) 1366 { 1367 struct mbochs_type *type = 1368 container_of(mtype, struct mbochs_type, type); 1369 1370 return sprintf(buf, "virtual display, %d MB video memory\n", 1371 type ? type->mbytes : 0); 1372 } 1373 static MDEV_TYPE_ATTR_RO(description); 1374 1375 static ssize_t available_instances_show(struct mdev_type *mtype, 1376 struct mdev_type_attribute *attr, 1377 char *buf) 1378 { 1379 struct mbochs_type *type = 1380 container_of(mtype, struct mbochs_type, type); 1381 int count = atomic_read(&mbochs_avail_mbytes) / type->mbytes; 1382 1383 return sprintf(buf, "%d\n", count); 1384 } 1385 static MDEV_TYPE_ATTR_RO(available_instances); 1386 1387 static const struct attribute *mdev_types_attrs[] = { 1388 &mdev_type_attr_name.attr, 1389 &mdev_type_attr_description.attr, 1390 &mdev_type_attr_available_instances.attr, 1391 NULL, 1392 }; 1393 1394 static const struct vfio_device_ops mbochs_dev_ops = { 1395 .close_device = mbochs_close_device, 1396 .init = mbochs_init_dev, 1397 .release = mbochs_release_dev, 1398 .read = mbochs_read, 1399 .write = mbochs_write, 1400 .ioctl = mbochs_ioctl, 1401 .mmap = mbochs_mmap, 1402 }; 1403 1404 static struct mdev_driver mbochs_driver = { 1405 .device_api = VFIO_DEVICE_API_PCI_STRING, 1406 .driver = { 1407 .name = "mbochs", 1408 .owner = THIS_MODULE, 1409 .mod_name = KBUILD_MODNAME, 1410 .dev_groups = mdev_dev_groups, 1411 }, 1412 .probe = mbochs_probe, 1413 .remove = mbochs_remove, 1414 .types_attrs = mdev_types_attrs, 1415 }; 1416 1417 static const struct file_operations vd_fops = { 1418 .owner = THIS_MODULE, 1419 }; 1420 1421 static void mbochs_device_release(struct device *dev) 1422 { 1423 /* nothing */ 1424 } 1425 1426 static int __init mbochs_dev_init(void) 1427 { 1428 int ret = 0; 1429 1430 atomic_set(&mbochs_avail_mbytes, max_mbytes); 1431 1432 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME); 1433 if (ret < 0) { 1434 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret); 1435 return ret; 1436 } 1437 cdev_init(&mbochs_cdev, &vd_fops); 1438 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1); 1439 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt)); 1440 1441 ret = mdev_register_driver(&mbochs_driver); 1442 if (ret) 1443 goto err_cdev; 1444 1445 mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME); 1446 if (IS_ERR(mbochs_class)) { 1447 pr_err("Error: failed to register mbochs_dev class\n"); 1448 ret = PTR_ERR(mbochs_class); 1449 goto err_driver; 1450 } 1451 mbochs_dev.class = mbochs_class; 1452 mbochs_dev.release = mbochs_device_release; 1453 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME); 1454 1455 ret = device_register(&mbochs_dev); 1456 if (ret) 1457 goto err_class; 1458 1459 ret = mdev_register_parent(&mbochs_parent, &mbochs_dev, &mbochs_driver, 1460 mbochs_mdev_types, 1461 ARRAY_SIZE(mbochs_mdev_types)); 1462 if (ret) 1463 goto err_device; 1464 1465 return 0; 1466 1467 err_device: 1468 device_unregister(&mbochs_dev); 1469 err_class: 1470 class_destroy(mbochs_class); 1471 err_driver: 1472 mdev_unregister_driver(&mbochs_driver); 1473 err_cdev: 1474 cdev_del(&mbochs_cdev); 1475 unregister_chrdev_region(mbochs_devt, MINORMASK + 1); 1476 return ret; 1477 } 1478 1479 static void __exit mbochs_dev_exit(void) 1480 { 1481 mbochs_dev.bus = NULL; 1482 mdev_unregister_parent(&mbochs_parent); 1483 1484 device_unregister(&mbochs_dev); 1485 mdev_unregister_driver(&mbochs_driver); 1486 cdev_del(&mbochs_cdev); 1487 unregister_chrdev_region(mbochs_devt, MINORMASK + 1); 1488 class_destroy(mbochs_class); 1489 mbochs_class = NULL; 1490 } 1491 1492 MODULE_IMPORT_NS(DMA_BUF); 1493 module_init(mbochs_dev_init) 1494 module_exit(mbochs_dev_exit) 1495