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 vfio_free_device(vdev); 598 } 599 600 static void mbochs_remove(struct mdev_device *mdev) 601 { 602 struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev); 603 604 vfio_unregister_group_dev(&mdev_state->vdev); 605 vfio_put_device(&mdev_state->vdev); 606 } 607 608 static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf, 609 size_t count, loff_t *ppos) 610 { 611 struct mdev_state *mdev_state = 612 container_of(vdev, struct mdev_state, vdev); 613 unsigned int done = 0; 614 int ret; 615 616 while (count) { 617 size_t filled; 618 619 if (count >= 4 && !(*ppos % 4)) { 620 u32 val; 621 622 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 623 *ppos, false); 624 if (ret <= 0) 625 goto read_err; 626 627 if (copy_to_user(buf, &val, sizeof(val))) 628 goto read_err; 629 630 filled = 4; 631 } else if (count >= 2 && !(*ppos % 2)) { 632 u16 val; 633 634 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 635 *ppos, false); 636 if (ret <= 0) 637 goto read_err; 638 639 if (copy_to_user(buf, &val, sizeof(val))) 640 goto read_err; 641 642 filled = 2; 643 } else { 644 u8 val; 645 646 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 647 *ppos, false); 648 if (ret <= 0) 649 goto read_err; 650 651 if (copy_to_user(buf, &val, sizeof(val))) 652 goto read_err; 653 654 filled = 1; 655 } 656 657 count -= filled; 658 done += filled; 659 *ppos += filled; 660 buf += filled; 661 } 662 663 return done; 664 665 read_err: 666 return -EFAULT; 667 } 668 669 static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf, 670 size_t count, loff_t *ppos) 671 { 672 struct mdev_state *mdev_state = 673 container_of(vdev, struct mdev_state, vdev); 674 unsigned int done = 0; 675 int ret; 676 677 while (count) { 678 size_t filled; 679 680 if (count >= 4 && !(*ppos % 4)) { 681 u32 val; 682 683 if (copy_from_user(&val, buf, sizeof(val))) 684 goto write_err; 685 686 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 687 *ppos, true); 688 if (ret <= 0) 689 goto write_err; 690 691 filled = 4; 692 } else if (count >= 2 && !(*ppos % 2)) { 693 u16 val; 694 695 if (copy_from_user(&val, buf, sizeof(val))) 696 goto write_err; 697 698 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 699 *ppos, true); 700 if (ret <= 0) 701 goto write_err; 702 703 filled = 2; 704 } else { 705 u8 val; 706 707 if (copy_from_user(&val, buf, sizeof(val))) 708 goto write_err; 709 710 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 711 *ppos, true); 712 if (ret <= 0) 713 goto write_err; 714 715 filled = 1; 716 } 717 count -= filled; 718 done += filled; 719 *ppos += filled; 720 buf += filled; 721 } 722 723 return done; 724 write_err: 725 return -EFAULT; 726 } 727 728 static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 729 pgoff_t pgoff) 730 { 731 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 732 733 if (!mdev_state->pages[pgoff]) { 734 mdev_state->pages[pgoff] = 735 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0); 736 if (!mdev_state->pages[pgoff]) 737 return NULL; 738 } 739 740 get_page(mdev_state->pages[pgoff]); 741 return mdev_state->pages[pgoff]; 742 } 743 744 static struct page *mbochs_get_page(struct mdev_state *mdev_state, 745 pgoff_t pgoff) 746 { 747 struct page *page; 748 749 if (WARN_ON(pgoff >= mdev_state->pagecount)) 750 return NULL; 751 752 mutex_lock(&mdev_state->ops_lock); 753 page = __mbochs_get_page(mdev_state, pgoff); 754 mutex_unlock(&mdev_state->ops_lock); 755 756 return page; 757 } 758 759 static void mbochs_put_pages(struct mdev_state *mdev_state) 760 { 761 struct device *dev = mdev_dev(mdev_state->mdev); 762 int i, count = 0; 763 764 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 765 766 for (i = 0; i < mdev_state->pagecount; i++) { 767 if (!mdev_state->pages[i]) 768 continue; 769 put_page(mdev_state->pages[i]); 770 mdev_state->pages[i] = NULL; 771 count++; 772 } 773 dev_dbg(dev, "%s: %d pages released\n", __func__, count); 774 } 775 776 static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf) 777 { 778 struct vm_area_struct *vma = vmf->vma; 779 struct mdev_state *mdev_state = vma->vm_private_data; 780 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 781 782 if (page_offset >= mdev_state->pagecount) 783 return VM_FAULT_SIGBUS; 784 785 vmf->page = mbochs_get_page(mdev_state, page_offset); 786 if (!vmf->page) 787 return VM_FAULT_SIGBUS; 788 789 return 0; 790 } 791 792 static const struct vm_operations_struct mbochs_region_vm_ops = { 793 .fault = mbochs_region_vm_fault, 794 }; 795 796 static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma) 797 { 798 struct mdev_state *mdev_state = 799 container_of(vdev, struct mdev_state, vdev); 800 801 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT) 802 return -EINVAL; 803 if (vma->vm_end < vma->vm_start) 804 return -EINVAL; 805 if (vma->vm_end - vma->vm_start > mdev_state->memsize) 806 return -EINVAL; 807 if ((vma->vm_flags & VM_SHARED) == 0) 808 return -EINVAL; 809 810 vma->vm_ops = &mbochs_region_vm_ops; 811 vma->vm_private_data = mdev_state; 812 return 0; 813 } 814 815 static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf) 816 { 817 struct vm_area_struct *vma = vmf->vma; 818 struct mbochs_dmabuf *dmabuf = vma->vm_private_data; 819 820 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount)) 821 return VM_FAULT_SIGBUS; 822 823 vmf->page = dmabuf->pages[vmf->pgoff]; 824 get_page(vmf->page); 825 return 0; 826 } 827 828 static const struct vm_operations_struct mbochs_dmabuf_vm_ops = { 829 .fault = mbochs_dmabuf_vm_fault, 830 }; 831 832 static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma) 833 { 834 struct mbochs_dmabuf *dmabuf = buf->priv; 835 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 836 837 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 838 839 if ((vma->vm_flags & VM_SHARED) == 0) 840 return -EINVAL; 841 842 vma->vm_ops = &mbochs_dmabuf_vm_ops; 843 vma->vm_private_data = dmabuf; 844 return 0; 845 } 846 847 static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf, 848 const char *prefix) 849 { 850 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 851 u32 fourcc = dmabuf->mode.drm_format; 852 853 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n", 854 prefix, dmabuf->id, 855 fourcc ? ((fourcc >> 0) & 0xff) : '-', 856 fourcc ? ((fourcc >> 8) & 0xff) : '-', 857 fourcc ? ((fourcc >> 16) & 0xff) : '-', 858 fourcc ? ((fourcc >> 24) & 0xff) : '-', 859 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride, 860 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount); 861 } 862 863 static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at, 864 enum dma_data_direction direction) 865 { 866 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 867 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 868 struct sg_table *sg; 869 870 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 871 872 sg = kzalloc(sizeof(*sg), GFP_KERNEL); 873 if (!sg) 874 goto err1; 875 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount, 876 0, dmabuf->mode.size, GFP_KERNEL) < 0) 877 goto err2; 878 if (dma_map_sgtable(at->dev, sg, direction, 0)) 879 goto err3; 880 881 return sg; 882 883 err3: 884 sg_free_table(sg); 885 err2: 886 kfree(sg); 887 err1: 888 return ERR_PTR(-ENOMEM); 889 } 890 891 static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at, 892 struct sg_table *sg, 893 enum dma_data_direction direction) 894 { 895 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 896 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 897 898 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 899 900 dma_unmap_sgtable(at->dev, sg, direction, 0); 901 sg_free_table(sg); 902 kfree(sg); 903 } 904 905 static void mbochs_release_dmabuf(struct dma_buf *buf) 906 { 907 struct mbochs_dmabuf *dmabuf = buf->priv; 908 struct mdev_state *mdev_state = dmabuf->mdev_state; 909 struct device *dev = mdev_dev(mdev_state->mdev); 910 pgoff_t pg; 911 912 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 913 914 for (pg = 0; pg < dmabuf->pagecount; pg++) 915 put_page(dmabuf->pages[pg]); 916 917 mutex_lock(&mdev_state->ops_lock); 918 dmabuf->buf = NULL; 919 if (dmabuf->unlinked) 920 kfree(dmabuf); 921 mutex_unlock(&mdev_state->ops_lock); 922 } 923 924 static struct dma_buf_ops mbochs_dmabuf_ops = { 925 .map_dma_buf = mbochs_map_dmabuf, 926 .unmap_dma_buf = mbochs_unmap_dmabuf, 927 .release = mbochs_release_dmabuf, 928 .mmap = mbochs_mmap_dmabuf, 929 }; 930 931 static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state, 932 struct mbochs_mode *mode) 933 { 934 struct mbochs_dmabuf *dmabuf; 935 pgoff_t page_offset, pg; 936 937 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 938 939 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL); 940 if (!dmabuf) 941 return NULL; 942 943 dmabuf->mode = *mode; 944 dmabuf->id = mdev_state->next_id++; 945 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE); 946 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *), 947 GFP_KERNEL); 948 if (!dmabuf->pages) 949 goto err_free_dmabuf; 950 951 page_offset = dmabuf->mode.offset >> PAGE_SHIFT; 952 for (pg = 0; pg < dmabuf->pagecount; pg++) { 953 dmabuf->pages[pg] = __mbochs_get_page(mdev_state, 954 page_offset + pg); 955 if (!dmabuf->pages[pg]) 956 goto err_free_pages; 957 } 958 959 dmabuf->mdev_state = mdev_state; 960 list_add(&dmabuf->next, &mdev_state->dmabufs); 961 962 mbochs_print_dmabuf(dmabuf, __func__); 963 return dmabuf; 964 965 err_free_pages: 966 while (pg > 0) 967 put_page(dmabuf->pages[--pg]); 968 kfree(dmabuf->pages); 969 err_free_dmabuf: 970 kfree(dmabuf); 971 return NULL; 972 } 973 974 static struct mbochs_dmabuf * 975 mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state, 976 struct mbochs_mode *mode) 977 { 978 struct mbochs_dmabuf *dmabuf; 979 980 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 981 982 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 983 if (mbochs_modes_equal(&dmabuf->mode, mode)) 984 return dmabuf; 985 986 return NULL; 987 } 988 989 static struct mbochs_dmabuf * 990 mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id) 991 { 992 struct mbochs_dmabuf *dmabuf; 993 994 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 995 996 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 997 if (dmabuf->id == id) 998 return dmabuf; 999 1000 return NULL; 1001 } 1002 1003 static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf) 1004 { 1005 struct mdev_state *mdev_state = dmabuf->mdev_state; 1006 struct device *dev = mdev_state->vdev.dev; 1007 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 1008 struct dma_buf *buf; 1009 1010 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 1011 1012 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) { 1013 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n", 1014 __func__); 1015 return -EINVAL; 1016 } 1017 1018 exp_info.ops = &mbochs_dmabuf_ops; 1019 exp_info.size = dmabuf->mode.size; 1020 exp_info.priv = dmabuf; 1021 1022 buf = dma_buf_export(&exp_info); 1023 if (IS_ERR(buf)) { 1024 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n", 1025 __func__, PTR_ERR(buf)); 1026 return PTR_ERR(buf); 1027 } 1028 1029 dmabuf->buf = buf; 1030 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 1031 return 0; 1032 } 1033 1034 static int mbochs_get_region_info(struct mdev_state *mdev_state, 1035 struct vfio_region_info_ext *ext) 1036 { 1037 struct vfio_region_info *region_info = &ext->base; 1038 1039 if (region_info->index >= MBOCHS_NUM_REGIONS) 1040 return -EINVAL; 1041 1042 switch (region_info->index) { 1043 case VFIO_PCI_CONFIG_REGION_INDEX: 1044 region_info->offset = 0; 1045 region_info->size = MBOCHS_CONFIG_SPACE_SIZE; 1046 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1047 VFIO_REGION_INFO_FLAG_WRITE); 1048 break; 1049 case VFIO_PCI_BAR0_REGION_INDEX: 1050 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET; 1051 region_info->size = mdev_state->memsize; 1052 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1053 VFIO_REGION_INFO_FLAG_WRITE | 1054 VFIO_REGION_INFO_FLAG_MMAP); 1055 break; 1056 case VFIO_PCI_BAR2_REGION_INDEX: 1057 region_info->offset = MBOCHS_MMIO_BAR_OFFSET; 1058 region_info->size = MBOCHS_MMIO_BAR_SIZE; 1059 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1060 VFIO_REGION_INFO_FLAG_WRITE); 1061 break; 1062 case MBOCHS_EDID_REGION_INDEX: 1063 ext->base.argsz = sizeof(*ext); 1064 ext->base.offset = MBOCHS_EDID_OFFSET; 1065 ext->base.size = MBOCHS_EDID_SIZE; 1066 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ | 1067 VFIO_REGION_INFO_FLAG_WRITE | 1068 VFIO_REGION_INFO_FLAG_CAPS); 1069 ext->base.cap_offset = offsetof(typeof(*ext), type); 1070 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE; 1071 ext->type.header.version = 1; 1072 ext->type.header.next = 0; 1073 ext->type.type = VFIO_REGION_TYPE_GFX; 1074 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID; 1075 break; 1076 default: 1077 region_info->size = 0; 1078 region_info->offset = 0; 1079 region_info->flags = 0; 1080 } 1081 1082 return 0; 1083 } 1084 1085 static int mbochs_get_irq_info(struct vfio_irq_info *irq_info) 1086 { 1087 irq_info->count = 0; 1088 return 0; 1089 } 1090 1091 static int mbochs_get_device_info(struct vfio_device_info *dev_info) 1092 { 1093 dev_info->flags = VFIO_DEVICE_FLAGS_PCI; 1094 dev_info->num_regions = MBOCHS_NUM_REGIONS; 1095 dev_info->num_irqs = VFIO_PCI_NUM_IRQS; 1096 return 0; 1097 } 1098 1099 static int mbochs_query_gfx_plane(struct mdev_state *mdev_state, 1100 struct vfio_device_gfx_plane_info *plane) 1101 { 1102 struct mbochs_dmabuf *dmabuf; 1103 struct mbochs_mode mode; 1104 int ret; 1105 1106 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) { 1107 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE | 1108 VFIO_GFX_PLANE_TYPE_DMABUF)) 1109 return 0; 1110 return -EINVAL; 1111 } 1112 1113 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF) 1114 return -EINVAL; 1115 1116 plane->drm_format_mod = 0; 1117 plane->x_pos = 0; 1118 plane->y_pos = 0; 1119 plane->x_hot = 0; 1120 plane->y_hot = 0; 1121 1122 mutex_lock(&mdev_state->ops_lock); 1123 1124 ret = -EINVAL; 1125 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY) 1126 ret = mbochs_check_framebuffer(mdev_state, &mode); 1127 if (ret < 0) { 1128 plane->drm_format = 0; 1129 plane->width = 0; 1130 plane->height = 0; 1131 plane->stride = 0; 1132 plane->size = 0; 1133 plane->dmabuf_id = 0; 1134 goto done; 1135 } 1136 1137 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode); 1138 if (!dmabuf) 1139 mbochs_dmabuf_alloc(mdev_state, &mode); 1140 if (!dmabuf) { 1141 mutex_unlock(&mdev_state->ops_lock); 1142 return -ENOMEM; 1143 } 1144 1145 plane->drm_format = dmabuf->mode.drm_format; 1146 plane->width = dmabuf->mode.width; 1147 plane->height = dmabuf->mode.height; 1148 plane->stride = dmabuf->mode.stride; 1149 plane->size = dmabuf->mode.size; 1150 plane->dmabuf_id = dmabuf->id; 1151 1152 done: 1153 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY && 1154 mdev_state->active_id != plane->dmabuf_id) { 1155 dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n", 1156 __func__, mdev_state->active_id, plane->dmabuf_id); 1157 mdev_state->active_id = plane->dmabuf_id; 1158 } 1159 mutex_unlock(&mdev_state->ops_lock); 1160 return 0; 1161 } 1162 1163 static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id) 1164 { 1165 struct mbochs_dmabuf *dmabuf; 1166 1167 mutex_lock(&mdev_state->ops_lock); 1168 1169 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id); 1170 if (!dmabuf) { 1171 mutex_unlock(&mdev_state->ops_lock); 1172 return -ENOENT; 1173 } 1174 1175 if (!dmabuf->buf) 1176 mbochs_dmabuf_export(dmabuf); 1177 1178 mutex_unlock(&mdev_state->ops_lock); 1179 1180 if (!dmabuf->buf) 1181 return -EINVAL; 1182 1183 return dma_buf_fd(dmabuf->buf, 0); 1184 } 1185 1186 static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd, 1187 unsigned long arg) 1188 { 1189 struct mdev_state *mdev_state = 1190 container_of(vdev, struct mdev_state, vdev); 1191 int ret = 0; 1192 unsigned long minsz, outsz; 1193 1194 switch (cmd) { 1195 case VFIO_DEVICE_GET_INFO: 1196 { 1197 struct vfio_device_info info; 1198 1199 minsz = offsetofend(struct vfio_device_info, num_irqs); 1200 1201 if (copy_from_user(&info, (void __user *)arg, minsz)) 1202 return -EFAULT; 1203 1204 if (info.argsz < minsz) 1205 return -EINVAL; 1206 1207 ret = mbochs_get_device_info(&info); 1208 if (ret) 1209 return ret; 1210 1211 if (copy_to_user((void __user *)arg, &info, minsz)) 1212 return -EFAULT; 1213 1214 return 0; 1215 } 1216 case VFIO_DEVICE_GET_REGION_INFO: 1217 { 1218 struct vfio_region_info_ext info; 1219 1220 minsz = offsetofend(typeof(info), base.offset); 1221 1222 if (copy_from_user(&info, (void __user *)arg, minsz)) 1223 return -EFAULT; 1224 1225 outsz = info.base.argsz; 1226 if (outsz < minsz) 1227 return -EINVAL; 1228 if (outsz > sizeof(info)) 1229 return -EINVAL; 1230 1231 ret = mbochs_get_region_info(mdev_state, &info); 1232 if (ret) 1233 return ret; 1234 1235 if (copy_to_user((void __user *)arg, &info, outsz)) 1236 return -EFAULT; 1237 1238 return 0; 1239 } 1240 1241 case VFIO_DEVICE_GET_IRQ_INFO: 1242 { 1243 struct vfio_irq_info info; 1244 1245 minsz = offsetofend(struct vfio_irq_info, count); 1246 1247 if (copy_from_user(&info, (void __user *)arg, minsz)) 1248 return -EFAULT; 1249 1250 if ((info.argsz < minsz) || 1251 (info.index >= VFIO_PCI_NUM_IRQS)) 1252 return -EINVAL; 1253 1254 ret = mbochs_get_irq_info(&info); 1255 if (ret) 1256 return ret; 1257 1258 if (copy_to_user((void __user *)arg, &info, minsz)) 1259 return -EFAULT; 1260 1261 return 0; 1262 } 1263 1264 case VFIO_DEVICE_QUERY_GFX_PLANE: 1265 { 1266 struct vfio_device_gfx_plane_info plane; 1267 1268 minsz = offsetofend(struct vfio_device_gfx_plane_info, 1269 region_index); 1270 1271 if (copy_from_user(&plane, (void __user *)arg, minsz)) 1272 return -EFAULT; 1273 1274 if (plane.argsz < minsz) 1275 return -EINVAL; 1276 1277 ret = mbochs_query_gfx_plane(mdev_state, &plane); 1278 if (ret) 1279 return ret; 1280 1281 if (copy_to_user((void __user *)arg, &plane, minsz)) 1282 return -EFAULT; 1283 1284 return 0; 1285 } 1286 1287 case VFIO_DEVICE_GET_GFX_DMABUF: 1288 { 1289 u32 dmabuf_id; 1290 1291 if (get_user(dmabuf_id, (__u32 __user *)arg)) 1292 return -EFAULT; 1293 1294 return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id); 1295 } 1296 1297 case VFIO_DEVICE_SET_IRQS: 1298 return -EINVAL; 1299 1300 case VFIO_DEVICE_RESET: 1301 return mbochs_reset(mdev_state); 1302 } 1303 return -ENOTTY; 1304 } 1305 1306 static void mbochs_close_device(struct vfio_device *vdev) 1307 { 1308 struct mdev_state *mdev_state = 1309 container_of(vdev, struct mdev_state, vdev); 1310 struct mbochs_dmabuf *dmabuf, *tmp; 1311 1312 mutex_lock(&mdev_state->ops_lock); 1313 1314 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) { 1315 list_del(&dmabuf->next); 1316 if (dmabuf->buf) { 1317 /* free in mbochs_release_dmabuf() */ 1318 dmabuf->unlinked = true; 1319 } else { 1320 kfree(dmabuf); 1321 } 1322 } 1323 mbochs_put_pages(mdev_state); 1324 1325 mutex_unlock(&mdev_state->ops_lock); 1326 } 1327 1328 static ssize_t 1329 memory_show(struct device *dev, struct device_attribute *attr, 1330 char *buf) 1331 { 1332 struct mdev_state *mdev_state = dev_get_drvdata(dev); 1333 1334 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes); 1335 } 1336 static DEVICE_ATTR_RO(memory); 1337 1338 static struct attribute *mdev_dev_attrs[] = { 1339 &dev_attr_memory.attr, 1340 NULL, 1341 }; 1342 1343 static const struct attribute_group mdev_dev_group = { 1344 .name = "vendor", 1345 .attrs = mdev_dev_attrs, 1346 }; 1347 1348 static const struct attribute_group *mdev_dev_groups[] = { 1349 &mdev_dev_group, 1350 NULL, 1351 }; 1352 1353 static ssize_t mbochs_show_description(struct mdev_type *mtype, char *buf) 1354 { 1355 struct mbochs_type *type = 1356 container_of(mtype, struct mbochs_type, type); 1357 1358 return sprintf(buf, "virtual display, %d MB video memory\n", 1359 type ? type->mbytes : 0); 1360 } 1361 1362 static unsigned int mbochs_get_available(struct mdev_type *mtype) 1363 { 1364 struct mbochs_type *type = 1365 container_of(mtype, struct mbochs_type, type); 1366 1367 return atomic_read(&mbochs_avail_mbytes) / type->mbytes; 1368 } 1369 1370 static const struct vfio_device_ops mbochs_dev_ops = { 1371 .close_device = mbochs_close_device, 1372 .init = mbochs_init_dev, 1373 .release = mbochs_release_dev, 1374 .read = mbochs_read, 1375 .write = mbochs_write, 1376 .ioctl = mbochs_ioctl, 1377 .mmap = mbochs_mmap, 1378 }; 1379 1380 static struct mdev_driver mbochs_driver = { 1381 .device_api = VFIO_DEVICE_API_PCI_STRING, 1382 .driver = { 1383 .name = "mbochs", 1384 .owner = THIS_MODULE, 1385 .mod_name = KBUILD_MODNAME, 1386 .dev_groups = mdev_dev_groups, 1387 }, 1388 .probe = mbochs_probe, 1389 .remove = mbochs_remove, 1390 .get_available = mbochs_get_available, 1391 .show_description = mbochs_show_description, 1392 }; 1393 1394 static const struct file_operations vd_fops = { 1395 .owner = THIS_MODULE, 1396 }; 1397 1398 static void mbochs_device_release(struct device *dev) 1399 { 1400 /* nothing */ 1401 } 1402 1403 static int __init mbochs_dev_init(void) 1404 { 1405 int ret = 0; 1406 1407 atomic_set(&mbochs_avail_mbytes, max_mbytes); 1408 1409 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME); 1410 if (ret < 0) { 1411 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret); 1412 return ret; 1413 } 1414 cdev_init(&mbochs_cdev, &vd_fops); 1415 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1); 1416 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt)); 1417 1418 ret = mdev_register_driver(&mbochs_driver); 1419 if (ret) 1420 goto err_cdev; 1421 1422 mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME); 1423 if (IS_ERR(mbochs_class)) { 1424 pr_err("Error: failed to register mbochs_dev class\n"); 1425 ret = PTR_ERR(mbochs_class); 1426 goto err_driver; 1427 } 1428 mbochs_dev.class = mbochs_class; 1429 mbochs_dev.release = mbochs_device_release; 1430 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME); 1431 1432 ret = device_register(&mbochs_dev); 1433 if (ret) 1434 goto err_class; 1435 1436 ret = mdev_register_parent(&mbochs_parent, &mbochs_dev, &mbochs_driver, 1437 mbochs_mdev_types, 1438 ARRAY_SIZE(mbochs_mdev_types)); 1439 if (ret) 1440 goto err_device; 1441 1442 return 0; 1443 1444 err_device: 1445 device_unregister(&mbochs_dev); 1446 err_class: 1447 class_destroy(mbochs_class); 1448 err_driver: 1449 mdev_unregister_driver(&mbochs_driver); 1450 err_cdev: 1451 cdev_del(&mbochs_cdev); 1452 unregister_chrdev_region(mbochs_devt, MINORMASK + 1); 1453 return ret; 1454 } 1455 1456 static void __exit mbochs_dev_exit(void) 1457 { 1458 mbochs_dev.bus = NULL; 1459 mdev_unregister_parent(&mbochs_parent); 1460 1461 device_unregister(&mbochs_dev); 1462 mdev_unregister_driver(&mbochs_driver); 1463 cdev_del(&mbochs_cdev); 1464 unregister_chrdev_region(mbochs_devt, MINORMASK + 1); 1465 class_destroy(mbochs_class); 1466 mbochs_class = NULL; 1467 } 1468 1469 MODULE_IMPORT_NS(DMA_BUF); 1470 module_init(mbochs_dev_init) 1471 module_exit(mbochs_dev_exit) 1472