samples/vfio-mdev/mbochs.c

   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
 134 struct vfio_region_info_ext {
 135         struct vfio_region_info          base;
 136         struct vfio_region_info_cap_type type;
 137 };
 138
 139 struct mbochs_mode {
 140         u32 drm_format;
 141         u32 bytepp;
 142         u32 width;
 143         u32 height;
 144         u32 stride;
 145         u32 __pad;
 146         u64 offset;
 147         u64 size;
 148 };
 149
 150 struct mbochs_dmabuf {
 151         struct mbochs_mode mode;
 152         u32 id;
 153         struct page **pages;
 154         pgoff_t pagecount;
 155         struct dma_buf *buf;
 156         struct mdev_state *mdev_state;
 157         struct list_head next;
 158         bool unlinked;
 159 };
 160
 161 /* State of each mdev device */
 162 struct mdev_state {
 163         u8 *vconfig;
 164         u64 bar_mask[3];
 165         u32 memory_bar_mask;
 166         struct mutex ops_lock;
 167         struct mdev_device *mdev;
 168
 169         const struct mbochs_type *type;
 170         u16 vbe[VBE_DISPI_INDEX_COUNT];
 171         u64 memsize;
 172         struct page **pages;
 173         pgoff_t pagecount;
 174         struct vfio_region_gfx_edid edid_regs;
 175         u8 edid_blob[0x400];
 176
 177         struct list_head dmabufs;
 178         u32 active_id;
 179         u32 next_id;
 180 };
 181
 182 static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = {
 183         [VBE_DISPI_INDEX_ID]               = "id",
 184         [VBE_DISPI_INDEX_XRES]             = "xres",
 185         [VBE_DISPI_INDEX_YRES]             = "yres",
 186         [VBE_DISPI_INDEX_BPP]              = "bpp",
 187         [VBE_DISPI_INDEX_ENABLE]           = "enable",
 188         [VBE_DISPI_INDEX_BANK]             = "bank",
 189         [VBE_DISPI_INDEX_VIRT_WIDTH]       = "virt-width",
 190         [VBE_DISPI_INDEX_VIRT_HEIGHT]      = "virt-height",
 191         [VBE_DISPI_INDEX_X_OFFSET]         = "x-offset",
 192         [VBE_DISPI_INDEX_Y_OFFSET]         = "y-offset",
 193         [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem",
 194 };
 195
 196 static const char *vbe_name(u32 index)
 197 {
 198         if (index < ARRAY_SIZE(vbe_name_list))
 199                 return vbe_name_list[index];
 200         return "(invalid)";
 201 }
 202
 203 static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
 204                                       pgoff_t pgoff);
 205 static struct page *mbochs_get_page(struct mdev_state *mdev_state,
 206                                     pgoff_t pgoff);
 207
 208 static void mbochs_create_config_space(struct mdev_state *mdev_state)
 209 {
 210         STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID],
 211                    0x1234);
 212         STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID],
 213                    0x1111);
 214         STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID],
 215                    PCI_SUBVENDOR_ID_REDHAT_QUMRANET);
 216         STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID],
 217                    PCI_SUBDEVICE_ID_QEMU);
 218
 219         STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND],
 220                    PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
 221         STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE],
 222                    PCI_CLASS_DISPLAY_OTHER);
 223         mdev_state->vconfig[PCI_CLASS_REVISION] =  0x01;
 224
 225         STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0],
 226                    PCI_BASE_ADDRESS_SPACE_MEMORY |
 227                    PCI_BASE_ADDRESS_MEM_TYPE_32  |
 228                    PCI_BASE_ADDRESS_MEM_PREFETCH);
 229         mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1;
 230
 231         STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2],
 232                    PCI_BASE_ADDRESS_SPACE_MEMORY |
 233                    PCI_BASE_ADDRESS_MEM_TYPE_32);
 234         mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1;
 235 }
 236
 237 static int mbochs_check_framebuffer(struct mdev_state *mdev_state,
 238                                     struct mbochs_mode *mode)
 239 {
 240         struct device *dev = mdev_dev(mdev_state->mdev);
 241         u16 *vbe = mdev_state->vbe;
 242         u32 virt_width;
 243
 244         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 245
 246         if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED))
 247                 goto nofb;
 248
 249         memset(mode, 0, sizeof(*mode));
 250         switch (vbe[VBE_DISPI_INDEX_BPP]) {
 251         case 32:
 252                 mode->drm_format = DRM_FORMAT_XRGB8888;
 253                 mode->bytepp = 4;
 254                 break;
 255         default:
 256                 dev_info_ratelimited(dev, "%s: bpp %d not supported\n",
 257                                      __func__, vbe[VBE_DISPI_INDEX_BPP]);
 258                 goto nofb;
 259         }
 260
 261         mode->width  = vbe[VBE_DISPI_INDEX_XRES];
 262         mode->height = vbe[VBE_DISPI_INDEX_YRES];
 263         virt_width  = vbe[VBE_DISPI_INDEX_VIRT_WIDTH];
 264         if (virt_width < mode->width)
 265                 virt_width = mode->width;
 266         mode->stride = virt_width * mode->bytepp;
 267         mode->size   = (u64)mode->stride * mode->height;
 268         mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp +
 269                        (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride);
 270
 271         if (mode->width < 64 || mode->height < 64) {
 272                 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n",
 273                                      __func__, mode->width, mode->height);
 274                 goto nofb;
 275         }
 276         if (mode->offset + mode->size > mdev_state->memsize) {
 277                 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n",
 278                                      __func__);
 279                 goto nofb;
 280         }
 281
 282         return 0;
 283
 284 nofb:
 285         memset(mode, 0, sizeof(*mode));
 286         return -EINVAL;
 287 }
 288
 289 static bool mbochs_modes_equal(struct mbochs_mode *mode1,
 290                                struct mbochs_mode *mode2)
 291 {
 292         return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0;
 293 }
 294
 295 static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
 296                                  char *buf, u32 count)
 297 {
 298         struct device *dev = mdev_dev(mdev_state->mdev);
 299         int index = (offset - PCI_BASE_ADDRESS_0) / 0x04;
 300         u32 cfg_addr;
 301
 302         switch (offset) {
 303         case PCI_BASE_ADDRESS_0:
 304         case PCI_BASE_ADDRESS_2:
 305                 cfg_addr = *(u32 *)buf;
 306
 307                 if (cfg_addr == 0xffffffff) {
 308                         cfg_addr = (cfg_addr & mdev_state->bar_mask[index]);
 309                 } else {
 310                         cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK;
 311                         if (cfg_addr)
 312                                 dev_info(dev, "BAR #%d @ 0x%x\n",
 313                                          index, cfg_addr);
 314                 }
 315
 316                 cfg_addr |= (mdev_state->vconfig[offset] &
 317                              ~PCI_BASE_ADDRESS_MEM_MASK);
 318                 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr);
 319                 break;
 320         }
 321 }
 322
 323 static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset,
 324                               char *buf, u32 count)
 325 {
 326         struct device *dev = mdev_dev(mdev_state->mdev);
 327         int index;
 328         u16 reg16;
 329
 330         switch (offset) {
 331         case 0x400 ... 0x41f: /* vga ioports remapped */
 332                 goto unhandled;
 333         case 0x500 ... 0x515: /* bochs dispi interface */
 334                 if (count != 2)
 335                         goto unhandled;
 336                 index = (offset - 0x500) / 2;
 337                 reg16 = *(u16 *)buf;
 338                 if (index < ARRAY_SIZE(mdev_state->vbe))
 339                         mdev_state->vbe[index] = reg16;
 340                 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n",
 341                         __func__, index, reg16, vbe_name(index));
 342                 break;
 343         case 0x600 ... 0x607: /* qemu extended regs */
 344                 goto unhandled;
 345         default:
 346 unhandled:
 347                 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
 348                         __func__, offset, count);
 349                 break;
 350         }
 351 }
 352
 353 static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset,
 354                              char *buf, u32 count)
 355 {
 356         struct device *dev = mdev_dev(mdev_state->mdev);
 357         struct vfio_region_gfx_edid *edid;
 358         u16 reg16 = 0;
 359         int index;
 360
 361         switch (offset) {
 362         case 0x000 ... 0x3ff: /* edid block */
 363                 edid = &mdev_state->edid_regs;
 364                 if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP ||
 365                     offset >= edid->edid_size) {
 366                         memset(buf, 0, count);
 367                         break;
 368                 }
 369                 memcpy(buf, mdev_state->edid_blob + offset, count);
 370                 break;
 371         case 0x500 ... 0x515: /* bochs dispi interface */
 372                 if (count != 2)
 373                         goto unhandled;
 374                 index = (offset - 0x500) / 2;
 375                 if (index < ARRAY_SIZE(mdev_state->vbe))
 376                         reg16 = mdev_state->vbe[index];
 377                 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n",
 378                         __func__, index, reg16, vbe_name(index));
 379                 *(u16 *)buf = reg16;
 380                 break;
 381         default:
 382 unhandled:
 383                 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
 384                         __func__, offset, count);
 385                 memset(buf, 0, count);
 386                 break;
 387         }
 388 }
 389
 390 static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset,
 391                              char *buf, u32 count, bool is_write)
 392 {
 393         char *regs = (void *)&mdev_state->edid_regs;
 394
 395         if (offset + count > sizeof(mdev_state->edid_regs))
 396                 return;
 397         if (count != 4)
 398                 return;
 399         if (offset % 4)
 400                 return;
 401
 402         if (is_write) {
 403                 switch (offset) {
 404                 case offsetof(struct vfio_region_gfx_edid, link_state):
 405                 case offsetof(struct vfio_region_gfx_edid, edid_size):
 406                         memcpy(regs + offset, buf, count);
 407                         break;
 408                 default:
 409                         /* read-only regs */
 410                         break;
 411                 }
 412         } else {
 413                 memcpy(buf, regs + offset, count);
 414         }
 415 }
 416
 417 static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset,
 418                              char *buf, u32 count, bool is_write)
 419 {
 420         if (offset + count > mdev_state->edid_regs.edid_max_size)
 421                 return;
 422         if (is_write)
 423                 memcpy(mdev_state->edid_blob + offset, buf, count);
 424         else
 425                 memcpy(buf, mdev_state->edid_blob + offset, count);
 426 }
 427
 428 static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
 429                            loff_t pos, bool is_write)
 430 {
 431         struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
 432         struct device *dev = mdev_dev(mdev);
 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(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_device *mdev)
 497 {
 498         struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
 499         u32 size64k = mdev_state->memsize / (64 * 1024);
 500         int i;
 501
 502         for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++)
 503                 mdev_state->vbe[i] = 0;
 504         mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5;
 505         mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k;
 506         return 0;
 507 }
 508
 509 static int mbochs_create(struct mdev_device *mdev)
 510 {
 511         const struct mbochs_type *type =
 512                 &mbochs_types[mdev_get_type_group_id(mdev)];
 513         struct device *dev = mdev_dev(mdev);
 514         struct mdev_state *mdev_state;
 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
 523         mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
 524         if (mdev_state->vconfig == NULL)
 525                 goto err_mem;
 526
 527         mdev_state->memsize = type->mbytes * 1024 * 1024;
 528         mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT;
 529         mdev_state->pages = kcalloc(mdev_state->pagecount,
 530                                     sizeof(struct page *),
 531                                     GFP_KERNEL);
 532         if (!mdev_state->pages)
 533                 goto err_mem;
 534
 535         dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__,
 536                  type->name, type->mbytes, mdev_state->pagecount);
 537
 538         mutex_init(&mdev_state->ops_lock);
 539         mdev_state->mdev = mdev;
 540         mdev_set_drvdata(mdev, mdev_state);
 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);
 551
 552         mbochs_used_mbytes += type->mbytes;
 553         return 0;
 554
 555 err_mem:
 556         kfree(mdev_state->vconfig);
 557         kfree(mdev_state);
 558         return -ENOMEM;
 559 }
 560
 561 static int mbochs_remove(struct mdev_device *mdev)
 562 {
 563         struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
 564
 565         mbochs_used_mbytes -= mdev_state->type->mbytes;
 566         mdev_set_drvdata(mdev, NULL);
 567         kfree(mdev_state->pages);
 568         kfree(mdev_state->vconfig);
 569         kfree(mdev_state);
 570         return 0;
 571 }
 572
 573 static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
 574                            size_t count, loff_t *ppos)
 575 {
 576         unsigned int done = 0;
 577         int ret;
 578
 579         while (count) {
 580                 size_t filled;
 581
 582                 if (count >= 4 && !(*ppos % 4)) {
 583                         u32 val;
 584
 585                         ret =  mdev_access(mdev, (char *)&val, sizeof(val),
 586                                            *ppos, false);
 587                         if (ret <= 0)
 588                                 goto read_err;
 589
 590                         if (copy_to_user(buf, &val, sizeof(val)))
 591                                 goto read_err;
 592
 593                         filled = 4;
 594                 } else if (count >= 2 && !(*ppos % 2)) {
 595                         u16 val;
 596
 597                         ret = mdev_access(mdev, (char *)&val, sizeof(val),
 598                                           *ppos, false);
 599                         if (ret <= 0)
 600                                 goto read_err;
 601
 602                         if (copy_to_user(buf, &val, sizeof(val)))
 603                                 goto read_err;
 604
 605                         filled = 2;
 606                 } else {
 607                         u8 val;
 608
 609                         ret = mdev_access(mdev, (char *)&val, sizeof(val),
 610                                           *ppos, false);
 611                         if (ret <= 0)
 612                                 goto read_err;
 613
 614                         if (copy_to_user(buf, &val, sizeof(val)))
 615                                 goto read_err;
 616
 617                         filled = 1;
 618                 }
 619
 620                 count -= filled;
 621                 done += filled;
 622                 *ppos += filled;
 623                 buf += filled;
 624         }
 625
 626         return done;
 627
 628 read_err:
 629         return -EFAULT;
 630 }
 631
 632 static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
 633                             size_t count, loff_t *ppos)
 634 {
 635         unsigned int done = 0;
 636         int ret;
 637
 638         while (count) {
 639                 size_t filled;
 640
 641                 if (count >= 4 && !(*ppos % 4)) {
 642                         u32 val;
 643
 644                         if (copy_from_user(&val, buf, sizeof(val)))
 645                                 goto write_err;
 646
 647                         ret = mdev_access(mdev, (char *)&val, sizeof(val),
 648                                           *ppos, true);
 649                         if (ret <= 0)
 650                                 goto write_err;
 651
 652                         filled = 4;
 653                 } else if (count >= 2 && !(*ppos % 2)) {
 654                         u16 val;
 655
 656                         if (copy_from_user(&val, buf, sizeof(val)))
 657                                 goto write_err;
 658
 659                         ret = mdev_access(mdev, (char *)&val, sizeof(val),
 660                                           *ppos, true);
 661                         if (ret <= 0)
 662                                 goto write_err;
 663
 664                         filled = 2;
 665                 } else {
 666                         u8 val;
 667
 668                         if (copy_from_user(&val, buf, sizeof(val)))
 669                                 goto write_err;
 670
 671                         ret = mdev_access(mdev, (char *)&val, sizeof(val),
 672                                           *ppos, true);
 673                         if (ret <= 0)
 674                                 goto write_err;
 675
 676                         filled = 1;
 677                 }
 678                 count -= filled;
 679                 done += filled;
 680                 *ppos += filled;
 681                 buf += filled;
 682         }
 683
 684         return done;
 685 write_err:
 686         return -EFAULT;
 687 }
 688
 689 static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
 690                                       pgoff_t pgoff)
 691 {
 692         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 693
 694         if (!mdev_state->pages[pgoff]) {
 695                 mdev_state->pages[pgoff] =
 696                         alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0);
 697                 if (!mdev_state->pages[pgoff])
 698                         return NULL;
 699         }
 700
 701         get_page(mdev_state->pages[pgoff]);
 702         return mdev_state->pages[pgoff];
 703 }
 704
 705 static struct page *mbochs_get_page(struct mdev_state *mdev_state,
 706                                     pgoff_t pgoff)
 707 {
 708         struct page *page;
 709
 710         if (WARN_ON(pgoff >= mdev_state->pagecount))
 711                 return NULL;
 712
 713         mutex_lock(&mdev_state->ops_lock);
 714         page = __mbochs_get_page(mdev_state, pgoff);
 715         mutex_unlock(&mdev_state->ops_lock);
 716
 717         return page;
 718 }
 719
 720 static void mbochs_put_pages(struct mdev_state *mdev_state)
 721 {
 722         struct device *dev = mdev_dev(mdev_state->mdev);
 723         int i, count = 0;
 724
 725         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 726
 727         for (i = 0; i < mdev_state->pagecount; i++) {
 728                 if (!mdev_state->pages[i])
 729                         continue;
 730                 put_page(mdev_state->pages[i]);
 731                 mdev_state->pages[i] = NULL;
 732                 count++;
 733         }
 734         dev_dbg(dev, "%s: %d pages released\n", __func__, count);
 735 }
 736
 737 static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf)
 738 {
 739         struct vm_area_struct *vma = vmf->vma;
 740         struct mdev_state *mdev_state = vma->vm_private_data;
 741         pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 742
 743         if (page_offset >= mdev_state->pagecount)
 744                 return VM_FAULT_SIGBUS;
 745
 746         vmf->page = mbochs_get_page(mdev_state, page_offset);
 747         if (!vmf->page)
 748                 return VM_FAULT_SIGBUS;
 749
 750         return 0;
 751 }
 752
 753 static const struct vm_operations_struct mbochs_region_vm_ops = {
 754         .fault = mbochs_region_vm_fault,
 755 };
 756
 757 static int mbochs_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
 758 {
 759         struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
 760
 761         if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
 762                 return -EINVAL;
 763         if (vma->vm_end < vma->vm_start)
 764                 return -EINVAL;
 765         if (vma->vm_end - vma->vm_start > mdev_state->memsize)
 766                 return -EINVAL;
 767         if ((vma->vm_flags & VM_SHARED) == 0)
 768                 return -EINVAL;
 769
 770         vma->vm_ops = &mbochs_region_vm_ops;
 771         vma->vm_private_data = mdev_state;
 772         return 0;
 773 }
 774
 775 static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf)
 776 {
 777         struct vm_area_struct *vma = vmf->vma;
 778         struct mbochs_dmabuf *dmabuf = vma->vm_private_data;
 779
 780         if (WARN_ON(vmf->pgoff >= dmabuf->pagecount))
 781                 return VM_FAULT_SIGBUS;
 782
 783         vmf->page = dmabuf->pages[vmf->pgoff];
 784         get_page(vmf->page);
 785         return 0;
 786 }
 787
 788 static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
 789         .fault = mbochs_dmabuf_vm_fault,
 790 };
 791
 792 static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
 793 {
 794         struct mbochs_dmabuf *dmabuf = buf->priv;
 795         struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
 796
 797         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
 798
 799         if ((vma->vm_flags & VM_SHARED) == 0)
 800                 return -EINVAL;
 801
 802         vma->vm_ops = &mbochs_dmabuf_vm_ops;
 803         vma->vm_private_data = dmabuf;
 804         return 0;
 805 }
 806
 807 static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf,
 808                                 const char *prefix)
 809 {
 810         struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
 811         u32 fourcc = dmabuf->mode.drm_format;
 812
 813         dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n",
 814                 prefix, dmabuf->id,
 815                 fourcc ? ((fourcc >>  0) & 0xff) : '-',
 816                 fourcc ? ((fourcc >>  8) & 0xff) : '-',
 817                 fourcc ? ((fourcc >> 16) & 0xff) : '-',
 818                 fourcc ? ((fourcc >> 24) & 0xff) : '-',
 819                 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride,
 820                 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount);
 821 }
 822
 823 static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at,
 824                                           enum dma_data_direction direction)
 825 {
 826         struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
 827         struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
 828         struct sg_table *sg;
 829
 830         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
 831
 832         sg = kzalloc(sizeof(*sg), GFP_KERNEL);
 833         if (!sg)
 834                 goto err1;
 835         if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount,
 836                                       0, dmabuf->mode.size, GFP_KERNEL) < 0)
 837                 goto err2;
 838         if (dma_map_sgtable(at->dev, sg, direction, 0))
 839                 goto err3;
 840
 841         return sg;
 842
 843 err3:
 844         sg_free_table(sg);
 845 err2:
 846         kfree(sg);
 847 err1:
 848         return ERR_PTR(-ENOMEM);
 849 }
 850
 851 static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at,
 852                                 struct sg_table *sg,
 853                                 enum dma_data_direction direction)
 854 {
 855         struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
 856         struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
 857
 858         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
 859
 860         dma_unmap_sgtable(at->dev, sg, direction, 0);
 861         sg_free_table(sg);
 862         kfree(sg);
 863 }
 864
 865 static void mbochs_release_dmabuf(struct dma_buf *buf)
 866 {
 867         struct mbochs_dmabuf *dmabuf = buf->priv;
 868         struct mdev_state *mdev_state = dmabuf->mdev_state;
 869         struct device *dev = mdev_dev(mdev_state->mdev);
 870         pgoff_t pg;
 871
 872         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
 873
 874         for (pg = 0; pg < dmabuf->pagecount; pg++)
 875                 put_page(dmabuf->pages[pg]);
 876
 877         mutex_lock(&mdev_state->ops_lock);
 878         dmabuf->buf = NULL;
 879         if (dmabuf->unlinked)
 880                 kfree(dmabuf);
 881         mutex_unlock(&mdev_state->ops_lock);
 882 }
 883
 884 static struct dma_buf_ops mbochs_dmabuf_ops = {
 885         .map_dma_buf      = mbochs_map_dmabuf,
 886         .unmap_dma_buf    = mbochs_unmap_dmabuf,
 887         .release          = mbochs_release_dmabuf,
 888         .mmap             = mbochs_mmap_dmabuf,
 889 };
 890
 891 static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state,
 892                                                  struct mbochs_mode *mode)
 893 {
 894         struct mbochs_dmabuf *dmabuf;
 895         pgoff_t page_offset, pg;
 896
 897         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 898
 899         dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL);
 900         if (!dmabuf)
 901                 return NULL;
 902
 903         dmabuf->mode = *mode;
 904         dmabuf->id = mdev_state->next_id++;
 905         dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE);
 906         dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *),
 907                                 GFP_KERNEL);
 908         if (!dmabuf->pages)
 909                 goto err_free_dmabuf;
 910
 911         page_offset = dmabuf->mode.offset >> PAGE_SHIFT;
 912         for (pg = 0; pg < dmabuf->pagecount; pg++) {
 913                 dmabuf->pages[pg] = __mbochs_get_page(mdev_state,
 914                                                       page_offset + pg);
 915                 if (!dmabuf->pages[pg])
 916                         goto err_free_pages;
 917         }
 918
 919         dmabuf->mdev_state = mdev_state;
 920         list_add(&dmabuf->next, &mdev_state->dmabufs);
 921
 922         mbochs_print_dmabuf(dmabuf, __func__);
 923         return dmabuf;
 924
 925 err_free_pages:
 926         while (pg > 0)
 927                 put_page(dmabuf->pages[--pg]);
 928         kfree(dmabuf->pages);
 929 err_free_dmabuf:
 930         kfree(dmabuf);
 931         return NULL;
 932 }
 933
 934 static struct mbochs_dmabuf *
 935 mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state,
 936                            struct mbochs_mode *mode)
 937 {
 938         struct mbochs_dmabuf *dmabuf;
 939
 940         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 941
 942         list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
 943                 if (mbochs_modes_equal(&dmabuf->mode, mode))
 944                         return dmabuf;
 945
 946         return NULL;
 947 }
 948
 949 static struct mbochs_dmabuf *
 950 mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
 951 {
 952         struct mbochs_dmabuf *dmabuf;
 953
 954         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 955
 956         list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
 957                 if (dmabuf->id == id)
 958                         return dmabuf;
 959
 960         return NULL;
 961 }
 962
 963 static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
 964 {
 965         struct mdev_state *mdev_state = dmabuf->mdev_state;
 966         struct device *dev = mdev_dev(mdev_state->mdev);
 967         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 968         struct dma_buf *buf;
 969
 970         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 971
 972         if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) {
 973                 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n",
 974                                      __func__);
 975                 return -EINVAL;
 976         }
 977
 978         exp_info.ops = &mbochs_dmabuf_ops;
 979         exp_info.size = dmabuf->mode.size;
 980         exp_info.priv = dmabuf;
 981
 982         buf = dma_buf_export(&exp_info);
 983         if (IS_ERR(buf)) {
 984                 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n",
 985                                      __func__, PTR_ERR(buf));
 986                 return PTR_ERR(buf);
 987         }
 988
 989         dmabuf->buf = buf;
 990         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
 991         return 0;
 992 }
 993
 994 static int mbochs_get_region_info(struct mdev_device *mdev,
 995                                   struct vfio_region_info_ext *ext)
 996 {
 997         struct vfio_region_info *region_info = &ext->base;
 998         struct mdev_state *mdev_state;
 999
1000         mdev_state = mdev_get_drvdata(mdev);
1001         if (!mdev_state)
1002                 return -EINVAL;
1003
1004         if (region_info->index >= MBOCHS_NUM_REGIONS)
1005                 return -EINVAL;
1006
1007         switch (region_info->index) {
1008         case VFIO_PCI_CONFIG_REGION_INDEX:
1009                 region_info->offset = 0;
1010                 region_info->size   = MBOCHS_CONFIG_SPACE_SIZE;
1011                 region_info->flags  = (VFIO_REGION_INFO_FLAG_READ |
1012                                        VFIO_REGION_INFO_FLAG_WRITE);
1013                 break;
1014         case VFIO_PCI_BAR0_REGION_INDEX:
1015                 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET;
1016                 region_info->size   = mdev_state->memsize;
1017                 region_info->flags  = (VFIO_REGION_INFO_FLAG_READ  |
1018                                        VFIO_REGION_INFO_FLAG_WRITE |
1019                                        VFIO_REGION_INFO_FLAG_MMAP);
1020                 break;
1021         case VFIO_PCI_BAR2_REGION_INDEX:
1022                 region_info->offset = MBOCHS_MMIO_BAR_OFFSET;
1023                 region_info->size   = MBOCHS_MMIO_BAR_SIZE;
1024                 region_info->flags  = (VFIO_REGION_INFO_FLAG_READ  |
1025                                        VFIO_REGION_INFO_FLAG_WRITE);
1026                 break;
1027         case MBOCHS_EDID_REGION_INDEX:
1028                 ext->base.argsz = sizeof(*ext);
1029                 ext->base.offset = MBOCHS_EDID_OFFSET;
1030                 ext->base.size = MBOCHS_EDID_SIZE;
1031                 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ  |
1032                                    VFIO_REGION_INFO_FLAG_WRITE |
1033                                    VFIO_REGION_INFO_FLAG_CAPS);
1034                 ext->base.cap_offset = offsetof(typeof(*ext), type);
1035                 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE;
1036                 ext->type.header.version = 1;
1037                 ext->type.header.next = 0;
1038                 ext->type.type = VFIO_REGION_TYPE_GFX;
1039                 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID;
1040                 break;
1041         default:
1042                 region_info->size   = 0;
1043                 region_info->offset = 0;
1044                 region_info->flags  = 0;
1045         }
1046
1047         return 0;
1048 }
1049
1050 static int mbochs_get_irq_info(struct mdev_device *mdev,
1051                                struct vfio_irq_info *irq_info)
1052 {
1053         irq_info->count = 0;
1054         return 0;
1055 }
1056
1057 static int mbochs_get_device_info(struct mdev_device *mdev,
1058                                   struct vfio_device_info *dev_info)
1059 {
1060         dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
1061         dev_info->num_regions = MBOCHS_NUM_REGIONS;
1062         dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
1063         return 0;
1064 }
1065
1066 static int mbochs_query_gfx_plane(struct mdev_device *mdev,
1067                                   struct vfio_device_gfx_plane_info *plane)
1068 {
1069         struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1070         struct device *dev = mdev_dev(mdev);
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(dev, "%s: primary: %d => %d\n", __func__,
1125                         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_device *mdev,
1133                                  u32 id)
1134 {
1135         struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1136         struct mbochs_dmabuf *dmabuf;
1137
1138         mutex_lock(&mdev_state->ops_lock);
1139
1140         dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id);
1141         if (!dmabuf) {
1142                 mutex_unlock(&mdev_state->ops_lock);
1143                 return -ENOENT;
1144         }
1145
1146         if (!dmabuf->buf)
1147                 mbochs_dmabuf_export(dmabuf);
1148
1149         mutex_unlock(&mdev_state->ops_lock);
1150
1151         if (!dmabuf->buf)
1152                 return -EINVAL;
1153
1154         return dma_buf_fd(dmabuf->buf, 0);
1155 }
1156
1157 static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
1158                         unsigned long arg)
1159 {
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(mdev, &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, &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(mdev, &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, &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, dmabuf_id);
1264         }
1265
1266         case VFIO_DEVICE_SET_IRQS:
1267                 return -EINVAL;
1268
1269         case VFIO_DEVICE_RESET:
1270                 return mbochs_reset(mdev);
1271         }
1272         return -ENOTTY;
1273 }
1274
1275 static int mbochs_open(struct mdev_device *mdev)
1276 {
1277         if (!try_module_get(THIS_MODULE))
1278                 return -ENODEV;
1279
1280         return 0;
1281 }
1282
1283 static void mbochs_close(struct mdev_device *mdev)
1284 {
1285         struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1286         struct mbochs_dmabuf *dmabuf, *tmp;
1287
1288         mutex_lock(&mdev_state->ops_lock);
1289
1290         list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) {
1291                 list_del(&dmabuf->next);
1292                 if (dmabuf->buf) {
1293                         /* free in mbochs_release_dmabuf() */
1294                         dmabuf->unlinked = true;
1295                 } else {
1296                         kfree(dmabuf);
1297                 }
1298         }
1299         mbochs_put_pages(mdev_state);
1300
1301         mutex_unlock(&mdev_state->ops_lock);
1302         module_put(THIS_MODULE);
1303 }
1304
1305 static ssize_t
1306 memory_show(struct device *dev, struct device_attribute *attr,
1307             char *buf)
1308 {
1309         struct mdev_device *mdev = mdev_from_dev(dev);
1310         struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
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 mdev_parent_ops mdev_fops = {
1402         .owner                  = THIS_MODULE,
1403         .mdev_attr_groups       = mdev_dev_groups,
1404         .supported_type_groups  = mdev_type_groups,
1405         .create                 = mbochs_create,
1406         .remove                 = mbochs_remove,
1407         .open                   = mbochs_open,
1408         .release                = mbochs_close,
1409         .read                   = mbochs_read,
1410         .write                  = mbochs_write,
1411         .ioctl                  = mbochs_ioctl,
1412         .mmap                   = mbochs_mmap,
1413 };
1414
1415 static const struct file_operations vd_fops = {
1416         .owner          = THIS_MODULE,
1417 };
1418
1419 static void mbochs_device_release(struct device *dev)
1420 {
1421         /* nothing */
1422 }
1423
1424 static int __init mbochs_dev_init(void)
1425 {
1426         int ret = 0;
1427
1428         ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
1429         if (ret < 0) {
1430                 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
1431                 return ret;
1432         }
1433         cdev_init(&mbochs_cdev, &vd_fops);
1434         cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
1435         pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
1436
1437         mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
1438         if (IS_ERR(mbochs_class)) {
1439                 pr_err("Error: failed to register mbochs_dev class\n");
1440                 ret = PTR_ERR(mbochs_class);
1441                 goto failed1;
1442         }
1443         mbochs_dev.class = mbochs_class;
1444         mbochs_dev.release = mbochs_device_release;
1445         dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME);
1446
1447         ret = device_register(&mbochs_dev);
1448         if (ret)
1449                 goto failed2;
1450
1451         ret = mdev_register_device(&mbochs_dev, &mdev_fops);
1452         if (ret)
1453                 goto failed3;
1454
1455         return 0;
1456
1457 failed3:
1458         device_unregister(&mbochs_dev);
1459 failed2:
1460         class_destroy(mbochs_class);
1461 failed1:
1462         cdev_del(&mbochs_cdev);
1463         unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1464         return ret;
1465 }
1466
1467 static void __exit mbochs_dev_exit(void)
1468 {
1469         mbochs_dev.bus = NULL;
1470         mdev_unregister_device(&mbochs_dev);
1471
1472         device_unregister(&mbochs_dev);
1473         cdev_del(&mbochs_cdev);
1474         unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1475         class_destroy(mbochs_class);
1476         mbochs_class = NULL;
1477 }
1478
1479 module_init(mbochs_dev_init)
1480 module_exit(mbochs_dev_exit)