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/device.h> 25 #include <linux/kernel.h> 26 #include <linux/slab.h> 27 #include <linux/vmalloc.h> 28 #include <linux/cdev.h> 29 #include <linux/vfio.h> 30 #include <linux/iommu.h> 31 #include <linux/sysfs.h> 32 #include <linux/mdev.h> 33 #include <linux/pci.h> 34 #include <linux/dma-buf.h> 35 #include <linux/highmem.h> 36 #include <drm/drm_fourcc.h> 37 #include <drm/drm_rect.h> 38 #include <drm/drm_modeset_lock.h> 39 #include <drm/drm_property.h> 40 #include <drm/drm_plane.h> 41 42 43 #define VBE_DISPI_INDEX_ID 0x0 44 #define VBE_DISPI_INDEX_XRES 0x1 45 #define VBE_DISPI_INDEX_YRES 0x2 46 #define VBE_DISPI_INDEX_BPP 0x3 47 #define VBE_DISPI_INDEX_ENABLE 0x4 48 #define VBE_DISPI_INDEX_BANK 0x5 49 #define VBE_DISPI_INDEX_VIRT_WIDTH 0x6 50 #define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7 51 #define VBE_DISPI_INDEX_X_OFFSET 0x8 52 #define VBE_DISPI_INDEX_Y_OFFSET 0x9 53 #define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa 54 #define VBE_DISPI_INDEX_COUNT 0xb 55 56 #define VBE_DISPI_ID0 0xB0C0 57 #define VBE_DISPI_ID1 0xB0C1 58 #define VBE_DISPI_ID2 0xB0C2 59 #define VBE_DISPI_ID3 0xB0C3 60 #define VBE_DISPI_ID4 0xB0C4 61 #define VBE_DISPI_ID5 0xB0C5 62 63 #define VBE_DISPI_DISABLED 0x00 64 #define VBE_DISPI_ENABLED 0x01 65 #define VBE_DISPI_GETCAPS 0x02 66 #define VBE_DISPI_8BIT_DAC 0x20 67 #define VBE_DISPI_LFB_ENABLED 0x40 68 #define VBE_DISPI_NOCLEARMEM 0x80 69 70 71 #define MBOCHS_NAME "mbochs" 72 #define MBOCHS_CLASS_NAME "mbochs" 73 74 #define MBOCHS_EDID_REGION_INDEX VFIO_PCI_NUM_REGIONS 75 #define MBOCHS_NUM_REGIONS (MBOCHS_EDID_REGION_INDEX+1) 76 77 #define MBOCHS_CONFIG_SPACE_SIZE 0xff 78 #define MBOCHS_MMIO_BAR_OFFSET PAGE_SIZE 79 #define MBOCHS_MMIO_BAR_SIZE PAGE_SIZE 80 #define MBOCHS_EDID_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \ 81 MBOCHS_MMIO_BAR_SIZE) 82 #define MBOCHS_EDID_SIZE PAGE_SIZE 83 #define MBOCHS_MEMORY_BAR_OFFSET (MBOCHS_EDID_OFFSET + \ 84 MBOCHS_EDID_SIZE) 85 86 #define MBOCHS_EDID_BLOB_OFFSET (MBOCHS_EDID_SIZE/2) 87 88 #define STORE_LE16(addr, val) (*(u16 *)addr = val) 89 #define STORE_LE32(addr, val) (*(u32 *)addr = val) 90 91 92 MODULE_LICENSE("GPL v2"); 93 94 static int max_mbytes = 256; 95 module_param_named(count, max_mbytes, int, 0444); 96 MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices"); 97 98 99 #define MBOCHS_TYPE_1 "small" 100 #define MBOCHS_TYPE_2 "medium" 101 #define MBOCHS_TYPE_3 "large" 102 103 static const struct mbochs_type { 104 const char *name; 105 u32 mbytes; 106 u32 max_x; 107 u32 max_y; 108 } mbochs_types[] = { 109 { 110 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1, 111 .mbytes = 4, 112 .max_x = 800, 113 .max_y = 600, 114 }, { 115 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2, 116 .mbytes = 16, 117 .max_x = 1920, 118 .max_y = 1440, 119 }, { 120 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3, 121 .mbytes = 64, 122 .max_x = 0, 123 .max_y = 0, 124 }, 125 }; 126 127 128 static dev_t mbochs_devt; 129 static struct class *mbochs_class; 130 static struct cdev mbochs_cdev; 131 static struct device mbochs_dev; 132 static int mbochs_used_mbytes; 133 static const struct vfio_device_ops mbochs_dev_ops; 134 135 struct vfio_region_info_ext { 136 struct vfio_region_info base; 137 struct vfio_region_info_cap_type type; 138 }; 139 140 struct mbochs_mode { 141 u32 drm_format; 142 u32 bytepp; 143 u32 width; 144 u32 height; 145 u32 stride; 146 u32 __pad; 147 u64 offset; 148 u64 size; 149 }; 150 151 struct mbochs_dmabuf { 152 struct mbochs_mode mode; 153 u32 id; 154 struct page **pages; 155 pgoff_t pagecount; 156 struct dma_buf *buf; 157 struct mdev_state *mdev_state; 158 struct list_head next; 159 bool unlinked; 160 }; 161 162 /* State of each mdev device */ 163 struct mdev_state { 164 struct vfio_device vdev; 165 u8 *vconfig; 166 u64 bar_mask[3]; 167 u32 memory_bar_mask; 168 struct mutex ops_lock; 169 struct mdev_device *mdev; 170 171 const struct mbochs_type *type; 172 u16 vbe[VBE_DISPI_INDEX_COUNT]; 173 u64 memsize; 174 struct page **pages; 175 pgoff_t pagecount; 176 struct vfio_region_gfx_edid edid_regs; 177 u8 edid_blob[0x400]; 178 179 struct list_head dmabufs; 180 u32 active_id; 181 u32 next_id; 182 }; 183 184 static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = { 185 [VBE_DISPI_INDEX_ID] = "id", 186 [VBE_DISPI_INDEX_XRES] = "xres", 187 [VBE_DISPI_INDEX_YRES] = "yres", 188 [VBE_DISPI_INDEX_BPP] = "bpp", 189 [VBE_DISPI_INDEX_ENABLE] = "enable", 190 [VBE_DISPI_INDEX_BANK] = "bank", 191 [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width", 192 [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height", 193 [VBE_DISPI_INDEX_X_OFFSET] = "x-offset", 194 [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset", 195 [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem", 196 }; 197 198 static const char *vbe_name(u32 index) 199 { 200 if (index < ARRAY_SIZE(vbe_name_list)) 201 return vbe_name_list[index]; 202 return "(invalid)"; 203 } 204 205 static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 206 pgoff_t pgoff); 207 static struct page *mbochs_get_page(struct mdev_state *mdev_state, 208 pgoff_t pgoff); 209 210 static void mbochs_create_config_space(struct mdev_state *mdev_state) 211 { 212 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID], 213 0x1234); 214 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID], 215 0x1111); 216 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID], 217 PCI_SUBVENDOR_ID_REDHAT_QUMRANET); 218 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID], 219 PCI_SUBDEVICE_ID_QEMU); 220 221 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND], 222 PCI_COMMAND_IO | PCI_COMMAND_MEMORY); 223 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE], 224 PCI_CLASS_DISPLAY_OTHER); 225 mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01; 226 227 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0], 228 PCI_BASE_ADDRESS_SPACE_MEMORY | 229 PCI_BASE_ADDRESS_MEM_TYPE_32 | 230 PCI_BASE_ADDRESS_MEM_PREFETCH); 231 mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1; 232 233 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2], 234 PCI_BASE_ADDRESS_SPACE_MEMORY | 235 PCI_BASE_ADDRESS_MEM_TYPE_32); 236 mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1; 237 } 238 239 static int mbochs_check_framebuffer(struct mdev_state *mdev_state, 240 struct mbochs_mode *mode) 241 { 242 struct device *dev = mdev_dev(mdev_state->mdev); 243 u16 *vbe = mdev_state->vbe; 244 u32 virt_width; 245 246 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 247 248 if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) 249 goto nofb; 250 251 memset(mode, 0, sizeof(*mode)); 252 switch (vbe[VBE_DISPI_INDEX_BPP]) { 253 case 32: 254 mode->drm_format = DRM_FORMAT_XRGB8888; 255 mode->bytepp = 4; 256 break; 257 default: 258 dev_info_ratelimited(dev, "%s: bpp %d not supported\n", 259 __func__, vbe[VBE_DISPI_INDEX_BPP]); 260 goto nofb; 261 } 262 263 mode->width = vbe[VBE_DISPI_INDEX_XRES]; 264 mode->height = vbe[VBE_DISPI_INDEX_YRES]; 265 virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH]; 266 if (virt_width < mode->width) 267 virt_width = mode->width; 268 mode->stride = virt_width * mode->bytepp; 269 mode->size = (u64)mode->stride * mode->height; 270 mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp + 271 (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride); 272 273 if (mode->width < 64 || mode->height < 64) { 274 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n", 275 __func__, mode->width, mode->height); 276 goto nofb; 277 } 278 if (mode->offset + mode->size > mdev_state->memsize) { 279 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n", 280 __func__); 281 goto nofb; 282 } 283 284 return 0; 285 286 nofb: 287 memset(mode, 0, sizeof(*mode)); 288 return -EINVAL; 289 } 290 291 static bool mbochs_modes_equal(struct mbochs_mode *mode1, 292 struct mbochs_mode *mode2) 293 { 294 return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0; 295 } 296 297 static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset, 298 char *buf, u32 count) 299 { 300 struct device *dev = mdev_dev(mdev_state->mdev); 301 int index = (offset - PCI_BASE_ADDRESS_0) / 0x04; 302 u32 cfg_addr; 303 304 switch (offset) { 305 case PCI_BASE_ADDRESS_0: 306 case PCI_BASE_ADDRESS_2: 307 cfg_addr = *(u32 *)buf; 308 309 if (cfg_addr == 0xffffffff) { 310 cfg_addr = (cfg_addr & mdev_state->bar_mask[index]); 311 } else { 312 cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK; 313 if (cfg_addr) 314 dev_info(dev, "BAR #%d @ 0x%x\n", 315 index, cfg_addr); 316 } 317 318 cfg_addr |= (mdev_state->vconfig[offset] & 319 ~PCI_BASE_ADDRESS_MEM_MASK); 320 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr); 321 break; 322 } 323 } 324 325 static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset, 326 char *buf, u32 count) 327 { 328 struct device *dev = mdev_dev(mdev_state->mdev); 329 int index; 330 u16 reg16; 331 332 switch (offset) { 333 case 0x400 ... 0x41f: /* vga ioports remapped */ 334 goto unhandled; 335 case 0x500 ... 0x515: /* bochs dispi interface */ 336 if (count != 2) 337 goto unhandled; 338 index = (offset - 0x500) / 2; 339 reg16 = *(u16 *)buf; 340 if (index < ARRAY_SIZE(mdev_state->vbe)) 341 mdev_state->vbe[index] = reg16; 342 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n", 343 __func__, index, reg16, vbe_name(index)); 344 break; 345 case 0x600 ... 0x607: /* qemu extended regs */ 346 goto unhandled; 347 default: 348 unhandled: 349 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", 350 __func__, offset, count); 351 break; 352 } 353 } 354 355 static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset, 356 char *buf, u32 count) 357 { 358 struct device *dev = mdev_dev(mdev_state->mdev); 359 struct vfio_region_gfx_edid *edid; 360 u16 reg16 = 0; 361 int index; 362 363 switch (offset) { 364 case 0x000 ... 0x3ff: /* edid block */ 365 edid = &mdev_state->edid_regs; 366 if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP || 367 offset >= edid->edid_size) { 368 memset(buf, 0, count); 369 break; 370 } 371 memcpy(buf, mdev_state->edid_blob + offset, count); 372 break; 373 case 0x500 ... 0x515: /* bochs dispi interface */ 374 if (count != 2) 375 goto unhandled; 376 index = (offset - 0x500) / 2; 377 if (index < ARRAY_SIZE(mdev_state->vbe)) 378 reg16 = mdev_state->vbe[index]; 379 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n", 380 __func__, index, reg16, vbe_name(index)); 381 *(u16 *)buf = reg16; 382 break; 383 default: 384 unhandled: 385 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", 386 __func__, offset, count); 387 memset(buf, 0, count); 388 break; 389 } 390 } 391 392 static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset, 393 char *buf, u32 count, bool is_write) 394 { 395 char *regs = (void *)&mdev_state->edid_regs; 396 397 if (offset + count > sizeof(mdev_state->edid_regs)) 398 return; 399 if (count != 4) 400 return; 401 if (offset % 4) 402 return; 403 404 if (is_write) { 405 switch (offset) { 406 case offsetof(struct vfio_region_gfx_edid, link_state): 407 case offsetof(struct vfio_region_gfx_edid, edid_size): 408 memcpy(regs + offset, buf, count); 409 break; 410 default: 411 /* read-only regs */ 412 break; 413 } 414 } else { 415 memcpy(buf, regs + offset, count); 416 } 417 } 418 419 static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset, 420 char *buf, u32 count, bool is_write) 421 { 422 if (offset + count > mdev_state->edid_regs.edid_max_size) 423 return; 424 if (is_write) 425 memcpy(mdev_state->edid_blob + offset, buf, count); 426 else 427 memcpy(buf, mdev_state->edid_blob + offset, count); 428 } 429 430 static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf, 431 size_t count, loff_t pos, bool is_write) 432 { 433 struct page *pg; 434 loff_t poff; 435 char *map; 436 int ret = 0; 437 438 mutex_lock(&mdev_state->ops_lock); 439 440 if (pos < MBOCHS_CONFIG_SPACE_SIZE) { 441 if (is_write) 442 handle_pci_cfg_write(mdev_state, pos, buf, count); 443 else 444 memcpy(buf, (mdev_state->vconfig + pos), count); 445 446 } else if (pos >= MBOCHS_MMIO_BAR_OFFSET && 447 pos + count <= (MBOCHS_MMIO_BAR_OFFSET + 448 MBOCHS_MMIO_BAR_SIZE)) { 449 pos -= MBOCHS_MMIO_BAR_OFFSET; 450 if (is_write) 451 handle_mmio_write(mdev_state, pos, buf, count); 452 else 453 handle_mmio_read(mdev_state, pos, buf, count); 454 455 } else if (pos >= MBOCHS_EDID_OFFSET && 456 pos + count <= (MBOCHS_EDID_OFFSET + 457 MBOCHS_EDID_SIZE)) { 458 pos -= MBOCHS_EDID_OFFSET; 459 if (pos < MBOCHS_EDID_BLOB_OFFSET) { 460 handle_edid_regs(mdev_state, pos, buf, count, is_write); 461 } else { 462 pos -= MBOCHS_EDID_BLOB_OFFSET; 463 handle_edid_blob(mdev_state, pos, buf, count, is_write); 464 } 465 466 } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET && 467 pos + count <= 468 MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) { 469 pos -= MBOCHS_MMIO_BAR_OFFSET; 470 poff = pos & ~PAGE_MASK; 471 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT); 472 map = kmap(pg); 473 if (is_write) 474 memcpy(map + poff, buf, count); 475 else 476 memcpy(buf, map + poff, count); 477 kunmap(pg); 478 put_page(pg); 479 480 } else { 481 dev_dbg(mdev_state->vdev.dev, "%s: %s @0x%llx (unhandled)\n", 482 __func__, is_write ? "WR" : "RD", pos); 483 ret = -1; 484 goto accessfailed; 485 } 486 487 ret = count; 488 489 490 accessfailed: 491 mutex_unlock(&mdev_state->ops_lock); 492 493 return ret; 494 } 495 496 static int mbochs_reset(struct mdev_state *mdev_state) 497 { 498 u32 size64k = mdev_state->memsize / (64 * 1024); 499 int i; 500 501 for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++) 502 mdev_state->vbe[i] = 0; 503 mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5; 504 mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k; 505 return 0; 506 } 507 508 static int mbochs_probe(struct mdev_device *mdev) 509 { 510 const struct mbochs_type *type = 511 &mbochs_types[mdev_get_type_group_id(mdev)]; 512 struct device *dev = mdev_dev(mdev); 513 struct mdev_state *mdev_state; 514 int ret = -ENOMEM; 515 516 if (type->mbytes + mbochs_used_mbytes > max_mbytes) 517 return -ENOMEM; 518 519 mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL); 520 if (mdev_state == NULL) 521 return -ENOMEM; 522 vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mbochs_dev_ops); 523 524 mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL); 525 if (mdev_state->vconfig == NULL) 526 goto err_mem; 527 528 mdev_state->memsize = type->mbytes * 1024 * 1024; 529 mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT; 530 mdev_state->pages = kcalloc(mdev_state->pagecount, 531 sizeof(struct page *), 532 GFP_KERNEL); 533 if (!mdev_state->pages) 534 goto err_mem; 535 536 dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__, 537 type->name, type->mbytes, mdev_state->pagecount); 538 539 mutex_init(&mdev_state->ops_lock); 540 mdev_state->mdev = mdev; 541 INIT_LIST_HEAD(&mdev_state->dmabufs); 542 mdev_state->next_id = 1; 543 544 mdev_state->type = type; 545 mdev_state->edid_regs.max_xres = type->max_x; 546 mdev_state->edid_regs.max_yres = type->max_y; 547 mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET; 548 mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob); 549 mbochs_create_config_space(mdev_state); 550 mbochs_reset(mdev_state); 551 552 mbochs_used_mbytes += type->mbytes; 553 554 ret = vfio_register_group_dev(&mdev_state->vdev); 555 if (ret) 556 goto err_mem; 557 dev_set_drvdata(&mdev->dev, mdev_state); 558 return 0; 559 560 err_mem: 561 kfree(mdev_state->vconfig); 562 kfree(mdev_state); 563 return ret; 564 } 565 566 static void mbochs_remove(struct mdev_device *mdev) 567 { 568 struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev); 569 570 mbochs_used_mbytes -= mdev_state->type->mbytes; 571 vfio_unregister_group_dev(&mdev_state->vdev); 572 kfree(mdev_state->pages); 573 kfree(mdev_state->vconfig); 574 kfree(mdev_state); 575 } 576 577 static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf, 578 size_t count, loff_t *ppos) 579 { 580 struct mdev_state *mdev_state = 581 container_of(vdev, struct mdev_state, vdev); 582 unsigned int done = 0; 583 int ret; 584 585 while (count) { 586 size_t filled; 587 588 if (count >= 4 && !(*ppos % 4)) { 589 u32 val; 590 591 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 592 *ppos, false); 593 if (ret <= 0) 594 goto read_err; 595 596 if (copy_to_user(buf, &val, sizeof(val))) 597 goto read_err; 598 599 filled = 4; 600 } else if (count >= 2 && !(*ppos % 2)) { 601 u16 val; 602 603 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 604 *ppos, false); 605 if (ret <= 0) 606 goto read_err; 607 608 if (copy_to_user(buf, &val, sizeof(val))) 609 goto read_err; 610 611 filled = 2; 612 } else { 613 u8 val; 614 615 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 616 *ppos, false); 617 if (ret <= 0) 618 goto read_err; 619 620 if (copy_to_user(buf, &val, sizeof(val))) 621 goto read_err; 622 623 filled = 1; 624 } 625 626 count -= filled; 627 done += filled; 628 *ppos += filled; 629 buf += filled; 630 } 631 632 return done; 633 634 read_err: 635 return -EFAULT; 636 } 637 638 static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf, 639 size_t count, loff_t *ppos) 640 { 641 struct mdev_state *mdev_state = 642 container_of(vdev, struct mdev_state, vdev); 643 unsigned int done = 0; 644 int ret; 645 646 while (count) { 647 size_t filled; 648 649 if (count >= 4 && !(*ppos % 4)) { 650 u32 val; 651 652 if (copy_from_user(&val, buf, sizeof(val))) 653 goto write_err; 654 655 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 656 *ppos, true); 657 if (ret <= 0) 658 goto write_err; 659 660 filled = 4; 661 } else if (count >= 2 && !(*ppos % 2)) { 662 u16 val; 663 664 if (copy_from_user(&val, buf, sizeof(val))) 665 goto write_err; 666 667 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 668 *ppos, true); 669 if (ret <= 0) 670 goto write_err; 671 672 filled = 2; 673 } else { 674 u8 val; 675 676 if (copy_from_user(&val, buf, sizeof(val))) 677 goto write_err; 678 679 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 680 *ppos, true); 681 if (ret <= 0) 682 goto write_err; 683 684 filled = 1; 685 } 686 count -= filled; 687 done += filled; 688 *ppos += filled; 689 buf += filled; 690 } 691 692 return done; 693 write_err: 694 return -EFAULT; 695 } 696 697 static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 698 pgoff_t pgoff) 699 { 700 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 701 702 if (!mdev_state->pages[pgoff]) { 703 mdev_state->pages[pgoff] = 704 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0); 705 if (!mdev_state->pages[pgoff]) 706 return NULL; 707 } 708 709 get_page(mdev_state->pages[pgoff]); 710 return mdev_state->pages[pgoff]; 711 } 712 713 static struct page *mbochs_get_page(struct mdev_state *mdev_state, 714 pgoff_t pgoff) 715 { 716 struct page *page; 717 718 if (WARN_ON(pgoff >= mdev_state->pagecount)) 719 return NULL; 720 721 mutex_lock(&mdev_state->ops_lock); 722 page = __mbochs_get_page(mdev_state, pgoff); 723 mutex_unlock(&mdev_state->ops_lock); 724 725 return page; 726 } 727 728 static void mbochs_put_pages(struct mdev_state *mdev_state) 729 { 730 struct device *dev = mdev_dev(mdev_state->mdev); 731 int i, count = 0; 732 733 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 734 735 for (i = 0; i < mdev_state->pagecount; i++) { 736 if (!mdev_state->pages[i]) 737 continue; 738 put_page(mdev_state->pages[i]); 739 mdev_state->pages[i] = NULL; 740 count++; 741 } 742 dev_dbg(dev, "%s: %d pages released\n", __func__, count); 743 } 744 745 static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf) 746 { 747 struct vm_area_struct *vma = vmf->vma; 748 struct mdev_state *mdev_state = vma->vm_private_data; 749 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 750 751 if (page_offset >= mdev_state->pagecount) 752 return VM_FAULT_SIGBUS; 753 754 vmf->page = mbochs_get_page(mdev_state, page_offset); 755 if (!vmf->page) 756 return VM_FAULT_SIGBUS; 757 758 return 0; 759 } 760 761 static const struct vm_operations_struct mbochs_region_vm_ops = { 762 .fault = mbochs_region_vm_fault, 763 }; 764 765 static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma) 766 { 767 struct mdev_state *mdev_state = 768 container_of(vdev, struct mdev_state, vdev); 769 770 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT) 771 return -EINVAL; 772 if (vma->vm_end < vma->vm_start) 773 return -EINVAL; 774 if (vma->vm_end - vma->vm_start > mdev_state->memsize) 775 return -EINVAL; 776 if ((vma->vm_flags & VM_SHARED) == 0) 777 return -EINVAL; 778 779 vma->vm_ops = &mbochs_region_vm_ops; 780 vma->vm_private_data = mdev_state; 781 return 0; 782 } 783 784 static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf) 785 { 786 struct vm_area_struct *vma = vmf->vma; 787 struct mbochs_dmabuf *dmabuf = vma->vm_private_data; 788 789 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount)) 790 return VM_FAULT_SIGBUS; 791 792 vmf->page = dmabuf->pages[vmf->pgoff]; 793 get_page(vmf->page); 794 return 0; 795 } 796 797 static const struct vm_operations_struct mbochs_dmabuf_vm_ops = { 798 .fault = mbochs_dmabuf_vm_fault, 799 }; 800 801 static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma) 802 { 803 struct mbochs_dmabuf *dmabuf = buf->priv; 804 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 805 806 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 807 808 if ((vma->vm_flags & VM_SHARED) == 0) 809 return -EINVAL; 810 811 vma->vm_ops = &mbochs_dmabuf_vm_ops; 812 vma->vm_private_data = dmabuf; 813 return 0; 814 } 815 816 static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf, 817 const char *prefix) 818 { 819 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 820 u32 fourcc = dmabuf->mode.drm_format; 821 822 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n", 823 prefix, dmabuf->id, 824 fourcc ? ((fourcc >> 0) & 0xff) : '-', 825 fourcc ? ((fourcc >> 8) & 0xff) : '-', 826 fourcc ? ((fourcc >> 16) & 0xff) : '-', 827 fourcc ? ((fourcc >> 24) & 0xff) : '-', 828 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride, 829 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount); 830 } 831 832 static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at, 833 enum dma_data_direction direction) 834 { 835 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 836 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 837 struct sg_table *sg; 838 839 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 840 841 sg = kzalloc(sizeof(*sg), GFP_KERNEL); 842 if (!sg) 843 goto err1; 844 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount, 845 0, dmabuf->mode.size, GFP_KERNEL) < 0) 846 goto err2; 847 if (dma_map_sgtable(at->dev, sg, direction, 0)) 848 goto err3; 849 850 return sg; 851 852 err3: 853 sg_free_table(sg); 854 err2: 855 kfree(sg); 856 err1: 857 return ERR_PTR(-ENOMEM); 858 } 859 860 static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at, 861 struct sg_table *sg, 862 enum dma_data_direction direction) 863 { 864 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 865 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 866 867 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 868 869 dma_unmap_sgtable(at->dev, sg, direction, 0); 870 sg_free_table(sg); 871 kfree(sg); 872 } 873 874 static void mbochs_release_dmabuf(struct dma_buf *buf) 875 { 876 struct mbochs_dmabuf *dmabuf = buf->priv; 877 struct mdev_state *mdev_state = dmabuf->mdev_state; 878 struct device *dev = mdev_dev(mdev_state->mdev); 879 pgoff_t pg; 880 881 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 882 883 for (pg = 0; pg < dmabuf->pagecount; pg++) 884 put_page(dmabuf->pages[pg]); 885 886 mutex_lock(&mdev_state->ops_lock); 887 dmabuf->buf = NULL; 888 if (dmabuf->unlinked) 889 kfree(dmabuf); 890 mutex_unlock(&mdev_state->ops_lock); 891 } 892 893 static struct dma_buf_ops mbochs_dmabuf_ops = { 894 .map_dma_buf = mbochs_map_dmabuf, 895 .unmap_dma_buf = mbochs_unmap_dmabuf, 896 .release = mbochs_release_dmabuf, 897 .mmap = mbochs_mmap_dmabuf, 898 }; 899 900 static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state, 901 struct mbochs_mode *mode) 902 { 903 struct mbochs_dmabuf *dmabuf; 904 pgoff_t page_offset, pg; 905 906 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 907 908 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL); 909 if (!dmabuf) 910 return NULL; 911 912 dmabuf->mode = *mode; 913 dmabuf->id = mdev_state->next_id++; 914 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE); 915 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *), 916 GFP_KERNEL); 917 if (!dmabuf->pages) 918 goto err_free_dmabuf; 919 920 page_offset = dmabuf->mode.offset >> PAGE_SHIFT; 921 for (pg = 0; pg < dmabuf->pagecount; pg++) { 922 dmabuf->pages[pg] = __mbochs_get_page(mdev_state, 923 page_offset + pg); 924 if (!dmabuf->pages[pg]) 925 goto err_free_pages; 926 } 927 928 dmabuf->mdev_state = mdev_state; 929 list_add(&dmabuf->next, &mdev_state->dmabufs); 930 931 mbochs_print_dmabuf(dmabuf, __func__); 932 return dmabuf; 933 934 err_free_pages: 935 while (pg > 0) 936 put_page(dmabuf->pages[--pg]); 937 kfree(dmabuf->pages); 938 err_free_dmabuf: 939 kfree(dmabuf); 940 return NULL; 941 } 942 943 static struct mbochs_dmabuf * 944 mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state, 945 struct mbochs_mode *mode) 946 { 947 struct mbochs_dmabuf *dmabuf; 948 949 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 950 951 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 952 if (mbochs_modes_equal(&dmabuf->mode, mode)) 953 return dmabuf; 954 955 return NULL; 956 } 957 958 static struct mbochs_dmabuf * 959 mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id) 960 { 961 struct mbochs_dmabuf *dmabuf; 962 963 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 964 965 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 966 if (dmabuf->id == id) 967 return dmabuf; 968 969 return NULL; 970 } 971 972 static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf) 973 { 974 struct mdev_state *mdev_state = dmabuf->mdev_state; 975 struct device *dev = mdev_state->vdev.dev; 976 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 977 struct dma_buf *buf; 978 979 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 980 981 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) { 982 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n", 983 __func__); 984 return -EINVAL; 985 } 986 987 exp_info.ops = &mbochs_dmabuf_ops; 988 exp_info.size = dmabuf->mode.size; 989 exp_info.priv = dmabuf; 990 991 buf = dma_buf_export(&exp_info); 992 if (IS_ERR(buf)) { 993 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n", 994 __func__, PTR_ERR(buf)); 995 return PTR_ERR(buf); 996 } 997 998 dmabuf->buf = buf; 999 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 1000 return 0; 1001 } 1002 1003 static int mbochs_get_region_info(struct mdev_state *mdev_state, 1004 struct vfio_region_info_ext *ext) 1005 { 1006 struct vfio_region_info *region_info = &ext->base; 1007 1008 if (region_info->index >= MBOCHS_NUM_REGIONS) 1009 return -EINVAL; 1010 1011 switch (region_info->index) { 1012 case VFIO_PCI_CONFIG_REGION_INDEX: 1013 region_info->offset = 0; 1014 region_info->size = MBOCHS_CONFIG_SPACE_SIZE; 1015 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1016 VFIO_REGION_INFO_FLAG_WRITE); 1017 break; 1018 case VFIO_PCI_BAR0_REGION_INDEX: 1019 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET; 1020 region_info->size = mdev_state->memsize; 1021 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1022 VFIO_REGION_INFO_FLAG_WRITE | 1023 VFIO_REGION_INFO_FLAG_MMAP); 1024 break; 1025 case VFIO_PCI_BAR2_REGION_INDEX: 1026 region_info->offset = MBOCHS_MMIO_BAR_OFFSET; 1027 region_info->size = MBOCHS_MMIO_BAR_SIZE; 1028 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1029 VFIO_REGION_INFO_FLAG_WRITE); 1030 break; 1031 case MBOCHS_EDID_REGION_INDEX: 1032 ext->base.argsz = sizeof(*ext); 1033 ext->base.offset = MBOCHS_EDID_OFFSET; 1034 ext->base.size = MBOCHS_EDID_SIZE; 1035 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ | 1036 VFIO_REGION_INFO_FLAG_WRITE | 1037 VFIO_REGION_INFO_FLAG_CAPS); 1038 ext->base.cap_offset = offsetof(typeof(*ext), type); 1039 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE; 1040 ext->type.header.version = 1; 1041 ext->type.header.next = 0; 1042 ext->type.type = VFIO_REGION_TYPE_GFX; 1043 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID; 1044 break; 1045 default: 1046 region_info->size = 0; 1047 region_info->offset = 0; 1048 region_info->flags = 0; 1049 } 1050 1051 return 0; 1052 } 1053 1054 static int mbochs_get_irq_info(struct vfio_irq_info *irq_info) 1055 { 1056 irq_info->count = 0; 1057 return 0; 1058 } 1059 1060 static int mbochs_get_device_info(struct vfio_device_info *dev_info) 1061 { 1062 dev_info->flags = VFIO_DEVICE_FLAGS_PCI; 1063 dev_info->num_regions = MBOCHS_NUM_REGIONS; 1064 dev_info->num_irqs = VFIO_PCI_NUM_IRQS; 1065 return 0; 1066 } 1067 1068 static int mbochs_query_gfx_plane(struct mdev_state *mdev_state, 1069 struct vfio_device_gfx_plane_info *plane) 1070 { 1071 struct mbochs_dmabuf *dmabuf; 1072 struct mbochs_mode mode; 1073 int ret; 1074 1075 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) { 1076 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE | 1077 VFIO_GFX_PLANE_TYPE_DMABUF)) 1078 return 0; 1079 return -EINVAL; 1080 } 1081 1082 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF) 1083 return -EINVAL; 1084 1085 plane->drm_format_mod = 0; 1086 plane->x_pos = 0; 1087 plane->y_pos = 0; 1088 plane->x_hot = 0; 1089 plane->y_hot = 0; 1090 1091 mutex_lock(&mdev_state->ops_lock); 1092 1093 ret = -EINVAL; 1094 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY) 1095 ret = mbochs_check_framebuffer(mdev_state, &mode); 1096 if (ret < 0) { 1097 plane->drm_format = 0; 1098 plane->width = 0; 1099 plane->height = 0; 1100 plane->stride = 0; 1101 plane->size = 0; 1102 plane->dmabuf_id = 0; 1103 goto done; 1104 } 1105 1106 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode); 1107 if (!dmabuf) 1108 mbochs_dmabuf_alloc(mdev_state, &mode); 1109 if (!dmabuf) { 1110 mutex_unlock(&mdev_state->ops_lock); 1111 return -ENOMEM; 1112 } 1113 1114 plane->drm_format = dmabuf->mode.drm_format; 1115 plane->width = dmabuf->mode.width; 1116 plane->height = dmabuf->mode.height; 1117 plane->stride = dmabuf->mode.stride; 1118 plane->size = dmabuf->mode.size; 1119 plane->dmabuf_id = dmabuf->id; 1120 1121 done: 1122 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY && 1123 mdev_state->active_id != plane->dmabuf_id) { 1124 dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n", 1125 __func__, mdev_state->active_id, plane->dmabuf_id); 1126 mdev_state->active_id = plane->dmabuf_id; 1127 } 1128 mutex_unlock(&mdev_state->ops_lock); 1129 return 0; 1130 } 1131 1132 static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id) 1133 { 1134 struct mbochs_dmabuf *dmabuf; 1135 1136 mutex_lock(&mdev_state->ops_lock); 1137 1138 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id); 1139 if (!dmabuf) { 1140 mutex_unlock(&mdev_state->ops_lock); 1141 return -ENOENT; 1142 } 1143 1144 if (!dmabuf->buf) 1145 mbochs_dmabuf_export(dmabuf); 1146 1147 mutex_unlock(&mdev_state->ops_lock); 1148 1149 if (!dmabuf->buf) 1150 return -EINVAL; 1151 1152 return dma_buf_fd(dmabuf->buf, 0); 1153 } 1154 1155 static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd, 1156 unsigned long arg) 1157 { 1158 struct mdev_state *mdev_state = 1159 container_of(vdev, struct mdev_state, vdev); 1160 int ret = 0; 1161 unsigned long minsz, outsz; 1162 1163 switch (cmd) { 1164 case VFIO_DEVICE_GET_INFO: 1165 { 1166 struct vfio_device_info info; 1167 1168 minsz = offsetofend(struct vfio_device_info, num_irqs); 1169 1170 if (copy_from_user(&info, (void __user *)arg, minsz)) 1171 return -EFAULT; 1172 1173 if (info.argsz < minsz) 1174 return -EINVAL; 1175 1176 ret = mbochs_get_device_info(&info); 1177 if (ret) 1178 return ret; 1179 1180 if (copy_to_user((void __user *)arg, &info, minsz)) 1181 return -EFAULT; 1182 1183 return 0; 1184 } 1185 case VFIO_DEVICE_GET_REGION_INFO: 1186 { 1187 struct vfio_region_info_ext info; 1188 1189 minsz = offsetofend(typeof(info), base.offset); 1190 1191 if (copy_from_user(&info, (void __user *)arg, minsz)) 1192 return -EFAULT; 1193 1194 outsz = info.base.argsz; 1195 if (outsz < minsz) 1196 return -EINVAL; 1197 if (outsz > sizeof(info)) 1198 return -EINVAL; 1199 1200 ret = mbochs_get_region_info(mdev_state, &info); 1201 if (ret) 1202 return ret; 1203 1204 if (copy_to_user((void __user *)arg, &info, outsz)) 1205 return -EFAULT; 1206 1207 return 0; 1208 } 1209 1210 case VFIO_DEVICE_GET_IRQ_INFO: 1211 { 1212 struct vfio_irq_info info; 1213 1214 minsz = offsetofend(struct vfio_irq_info, count); 1215 1216 if (copy_from_user(&info, (void __user *)arg, minsz)) 1217 return -EFAULT; 1218 1219 if ((info.argsz < minsz) || 1220 (info.index >= VFIO_PCI_NUM_IRQS)) 1221 return -EINVAL; 1222 1223 ret = mbochs_get_irq_info(&info); 1224 if (ret) 1225 return ret; 1226 1227 if (copy_to_user((void __user *)arg, &info, minsz)) 1228 return -EFAULT; 1229 1230 return 0; 1231 } 1232 1233 case VFIO_DEVICE_QUERY_GFX_PLANE: 1234 { 1235 struct vfio_device_gfx_plane_info plane; 1236 1237 minsz = offsetofend(struct vfio_device_gfx_plane_info, 1238 region_index); 1239 1240 if (copy_from_user(&plane, (void __user *)arg, minsz)) 1241 return -EFAULT; 1242 1243 if (plane.argsz < minsz) 1244 return -EINVAL; 1245 1246 ret = mbochs_query_gfx_plane(mdev_state, &plane); 1247 if (ret) 1248 return ret; 1249 1250 if (copy_to_user((void __user *)arg, &plane, minsz)) 1251 return -EFAULT; 1252 1253 return 0; 1254 } 1255 1256 case VFIO_DEVICE_GET_GFX_DMABUF: 1257 { 1258 u32 dmabuf_id; 1259 1260 if (get_user(dmabuf_id, (__u32 __user *)arg)) 1261 return -EFAULT; 1262 1263 return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id); 1264 } 1265 1266 case VFIO_DEVICE_SET_IRQS: 1267 return -EINVAL; 1268 1269 case VFIO_DEVICE_RESET: 1270 return mbochs_reset(mdev_state); 1271 } 1272 return -ENOTTY; 1273 } 1274 1275 static int mbochs_open(struct vfio_device *vdev) 1276 { 1277 if (!try_module_get(THIS_MODULE)) 1278 return -ENODEV; 1279 1280 return 0; 1281 } 1282 1283 static void mbochs_close(struct vfio_device *vdev) 1284 { 1285 struct mdev_state *mdev_state = 1286 container_of(vdev, struct mdev_state, vdev); 1287 struct mbochs_dmabuf *dmabuf, *tmp; 1288 1289 mutex_lock(&mdev_state->ops_lock); 1290 1291 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) { 1292 list_del(&dmabuf->next); 1293 if (dmabuf->buf) { 1294 /* free in mbochs_release_dmabuf() */ 1295 dmabuf->unlinked = true; 1296 } else { 1297 kfree(dmabuf); 1298 } 1299 } 1300 mbochs_put_pages(mdev_state); 1301 1302 mutex_unlock(&mdev_state->ops_lock); 1303 module_put(THIS_MODULE); 1304 } 1305 1306 static ssize_t 1307 memory_show(struct device *dev, struct device_attribute *attr, 1308 char *buf) 1309 { 1310 struct mdev_state *mdev_state = dev_get_drvdata(dev); 1311 1312 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes); 1313 } 1314 static DEVICE_ATTR_RO(memory); 1315 1316 static struct attribute *mdev_dev_attrs[] = { 1317 &dev_attr_memory.attr, 1318 NULL, 1319 }; 1320 1321 static const struct attribute_group mdev_dev_group = { 1322 .name = "vendor", 1323 .attrs = mdev_dev_attrs, 1324 }; 1325 1326 static const struct attribute_group *mdev_dev_groups[] = { 1327 &mdev_dev_group, 1328 NULL, 1329 }; 1330 1331 static ssize_t name_show(struct mdev_type *mtype, 1332 struct mdev_type_attribute *attr, char *buf) 1333 { 1334 const struct mbochs_type *type = 1335 &mbochs_types[mtype_get_type_group_id(mtype)]; 1336 1337 return sprintf(buf, "%s\n", type->name); 1338 } 1339 static MDEV_TYPE_ATTR_RO(name); 1340 1341 static ssize_t description_show(struct mdev_type *mtype, 1342 struct mdev_type_attribute *attr, char *buf) 1343 { 1344 const struct mbochs_type *type = 1345 &mbochs_types[mtype_get_type_group_id(mtype)]; 1346 1347 return sprintf(buf, "virtual display, %d MB video memory\n", 1348 type ? type->mbytes : 0); 1349 } 1350 static MDEV_TYPE_ATTR_RO(description); 1351 1352 static ssize_t available_instances_show(struct mdev_type *mtype, 1353 struct mdev_type_attribute *attr, 1354 char *buf) 1355 { 1356 const struct mbochs_type *type = 1357 &mbochs_types[mtype_get_type_group_id(mtype)]; 1358 int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes; 1359 1360 return sprintf(buf, "%d\n", count); 1361 } 1362 static MDEV_TYPE_ATTR_RO(available_instances); 1363 1364 static ssize_t device_api_show(struct mdev_type *mtype, 1365 struct mdev_type_attribute *attr, char *buf) 1366 { 1367 return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING); 1368 } 1369 static MDEV_TYPE_ATTR_RO(device_api); 1370 1371 static struct attribute *mdev_types_attrs[] = { 1372 &mdev_type_attr_name.attr, 1373 &mdev_type_attr_description.attr, 1374 &mdev_type_attr_device_api.attr, 1375 &mdev_type_attr_available_instances.attr, 1376 NULL, 1377 }; 1378 1379 static struct attribute_group mdev_type_group1 = { 1380 .name = MBOCHS_TYPE_1, 1381 .attrs = mdev_types_attrs, 1382 }; 1383 1384 static struct attribute_group mdev_type_group2 = { 1385 .name = MBOCHS_TYPE_2, 1386 .attrs = mdev_types_attrs, 1387 }; 1388 1389 static struct attribute_group mdev_type_group3 = { 1390 .name = MBOCHS_TYPE_3, 1391 .attrs = mdev_types_attrs, 1392 }; 1393 1394 static struct attribute_group *mdev_type_groups[] = { 1395 &mdev_type_group1, 1396 &mdev_type_group2, 1397 &mdev_type_group3, 1398 NULL, 1399 }; 1400 1401 static const struct vfio_device_ops mbochs_dev_ops = { 1402 .open = mbochs_open, 1403 .release = mbochs_close, 1404 .read = mbochs_read, 1405 .write = mbochs_write, 1406 .ioctl = mbochs_ioctl, 1407 .mmap = mbochs_mmap, 1408 }; 1409 1410 static struct mdev_driver mbochs_driver = { 1411 .driver = { 1412 .name = "mbochs", 1413 .owner = THIS_MODULE, 1414 .mod_name = KBUILD_MODNAME, 1415 .dev_groups = mdev_dev_groups, 1416 }, 1417 .probe = mbochs_probe, 1418 .remove = mbochs_remove, 1419 }; 1420 1421 static const struct mdev_parent_ops mdev_fops = { 1422 .owner = THIS_MODULE, 1423 .device_driver = &mbochs_driver, 1424 .supported_type_groups = mdev_type_groups, 1425 }; 1426 1427 static const struct file_operations vd_fops = { 1428 .owner = THIS_MODULE, 1429 }; 1430 1431 static void mbochs_device_release(struct device *dev) 1432 { 1433 /* nothing */ 1434 } 1435 1436 static int __init mbochs_dev_init(void) 1437 { 1438 int ret = 0; 1439 1440 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME); 1441 if (ret < 0) { 1442 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret); 1443 return ret; 1444 } 1445 cdev_init(&mbochs_cdev, &vd_fops); 1446 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1); 1447 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt)); 1448 1449 ret = mdev_register_driver(&mbochs_driver); 1450 if (ret) 1451 goto err_cdev; 1452 1453 mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME); 1454 if (IS_ERR(mbochs_class)) { 1455 pr_err("Error: failed to register mbochs_dev class\n"); 1456 ret = PTR_ERR(mbochs_class); 1457 goto err_driver; 1458 } 1459 mbochs_dev.class = mbochs_class; 1460 mbochs_dev.release = mbochs_device_release; 1461 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME); 1462 1463 ret = device_register(&mbochs_dev); 1464 if (ret) 1465 goto err_class; 1466 1467 ret = mdev_register_device(&mbochs_dev, &mdev_fops); 1468 if (ret) 1469 goto err_device; 1470 1471 return 0; 1472 1473 err_device: 1474 device_unregister(&mbochs_dev); 1475 err_class: 1476 class_destroy(mbochs_class); 1477 err_driver: 1478 mdev_unregister_driver(&mbochs_driver); 1479 err_cdev: 1480 cdev_del(&mbochs_cdev); 1481 unregister_chrdev_region(mbochs_devt, MINORMASK + 1); 1482 return ret; 1483 } 1484 1485 static void __exit mbochs_dev_exit(void) 1486 { 1487 mbochs_dev.bus = NULL; 1488 mdev_unregister_device(&mbochs_dev); 1489 1490 device_unregister(&mbochs_dev); 1491 mdev_unregister_driver(&mbochs_driver); 1492 cdev_del(&mbochs_cdev); 1493 unregister_chrdev_region(mbochs_devt, MINORMASK + 1); 1494 class_destroy(mbochs_class); 1495 mbochs_class = NULL; 1496 } 1497 1498 module_init(mbochs_dev_init) 1499 module_exit(mbochs_dev_exit) 1500