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 atomic_t mbochs_avail_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         int avail_mbytes = atomic_read(&mbochs_avail_mbytes);
 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         int ret = -ENOMEM;
 516
 517         do {
 518                 if (avail_mbytes < type->mbytes)
 519                         return -ENOSPC;
 520         } while (!atomic_try_cmpxchg(&mbochs_avail_mbytes, &avail_mbytes,
 521                                      avail_mbytes - type->mbytes));
 522
 523         mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
 524         if (mdev_state == NULL)
 525                 goto err_avail;
 526         vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mbochs_dev_ops);
 527
 528         mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
 529         if (mdev_state->vconfig == NULL)
 530                 goto err_mem;
 531
 532         mdev_state->memsize = type->mbytes * 1024 * 1024;
 533         mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT;
 534         mdev_state->pages = kcalloc(mdev_state->pagecount,
 535                                     sizeof(struct page *),
 536                                     GFP_KERNEL);
 537         if (!mdev_state->pages)
 538                 goto err_mem;
 539
 540         dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__,
 541                  type->name, type->mbytes, mdev_state->pagecount);
 542
 543         mutex_init(&mdev_state->ops_lock);
 544         mdev_state->mdev = mdev;
 545         INIT_LIST_HEAD(&mdev_state->dmabufs);
 546         mdev_state->next_id = 1;
 547
 548         mdev_state->type = type;
 549         mdev_state->edid_regs.max_xres = type->max_x;
 550         mdev_state->edid_regs.max_yres = type->max_y;
 551         mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET;
 552         mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob);
 553         mbochs_create_config_space(mdev_state);
 554         mbochs_reset(mdev_state);
 555
 556         ret = vfio_register_emulated_iommu_dev(&mdev_state->vdev);
 557         if (ret)
 558                 goto err_mem;
 559         dev_set_drvdata(&mdev->dev, mdev_state);
 560         return 0;
 561 err_mem:
 562         vfio_uninit_group_dev(&mdev_state->vdev);
 563         kfree(mdev_state->pages);
 564         kfree(mdev_state->vconfig);
 565         kfree(mdev_state);
 566 err_avail:
 567         atomic_add(type->mbytes, &mbochs_avail_mbytes);
 568         return ret;
 569 }
 570
 571 static void mbochs_remove(struct mdev_device *mdev)
 572 {
 573         struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
 574
 575         vfio_unregister_group_dev(&mdev_state->vdev);
 576         vfio_uninit_group_dev(&mdev_state->vdev);
 577         atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes);
 578         kfree(mdev_state->pages);
 579         kfree(mdev_state->vconfig);
 580         kfree(mdev_state);
 581 }
 582
 583 static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf,
 584                            size_t count, loff_t *ppos)
 585 {
 586         struct mdev_state *mdev_state =
 587                 container_of(vdev, struct mdev_state, vdev);
 588         unsigned int done = 0;
 589         int ret;
 590
 591         while (count) {
 592                 size_t filled;
 593
 594                 if (count >= 4 && !(*ppos % 4)) {
 595                         u32 val;
 596
 597                         ret =  mdev_access(mdev_state, (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 = 4;
 606                 } else if (count >= 2 && !(*ppos % 2)) {
 607                         u16 val;
 608
 609                         ret = mdev_access(mdev_state, (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 = 2;
 618                 } else {
 619                         u8 val;
 620
 621                         ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 622                                           *ppos, false);
 623                         if (ret <= 0)
 624                                 goto read_err;
 625
 626                         if (copy_to_user(buf, &val, sizeof(val)))
 627                                 goto read_err;
 628
 629                         filled = 1;
 630                 }
 631
 632                 count -= filled;
 633                 done += filled;
 634                 *ppos += filled;
 635                 buf += filled;
 636         }
 637
 638         return done;
 639
 640 read_err:
 641         return -EFAULT;
 642 }
 643
 644 static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf,
 645                             size_t count, loff_t *ppos)
 646 {
 647         struct mdev_state *mdev_state =
 648                 container_of(vdev, struct mdev_state, vdev);
 649         unsigned int done = 0;
 650         int ret;
 651
 652         while (count) {
 653                 size_t filled;
 654
 655                 if (count >= 4 && !(*ppos % 4)) {
 656                         u32 val;
 657
 658                         if (copy_from_user(&val, buf, sizeof(val)))
 659                                 goto write_err;
 660
 661                         ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 662                                           *ppos, true);
 663                         if (ret <= 0)
 664                                 goto write_err;
 665
 666                         filled = 4;
 667                 } else if (count >= 2 && !(*ppos % 2)) {
 668                         u16 val;
 669
 670                         if (copy_from_user(&val, buf, sizeof(val)))
 671                                 goto write_err;
 672
 673                         ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 674                                           *ppos, true);
 675                         if (ret <= 0)
 676                                 goto write_err;
 677
 678                         filled = 2;
 679                 } else {
 680                         u8 val;
 681
 682                         if (copy_from_user(&val, buf, sizeof(val)))
 683                                 goto write_err;
 684
 685                         ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
 686                                           *ppos, true);
 687                         if (ret <= 0)
 688                                 goto write_err;
 689
 690                         filled = 1;
 691                 }
 692                 count -= filled;
 693                 done += filled;
 694                 *ppos += filled;
 695                 buf += filled;
 696         }
 697
 698         return done;
 699 write_err:
 700         return -EFAULT;
 701 }
 702
 703 static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
 704                                       pgoff_t pgoff)
 705 {
 706         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 707
 708         if (!mdev_state->pages[pgoff]) {
 709                 mdev_state->pages[pgoff] =
 710                         alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0);
 711                 if (!mdev_state->pages[pgoff])
 712                         return NULL;
 713         }
 714
 715         get_page(mdev_state->pages[pgoff]);
 716         return mdev_state->pages[pgoff];
 717 }
 718
 719 static struct page *mbochs_get_page(struct mdev_state *mdev_state,
 720                                     pgoff_t pgoff)
 721 {
 722         struct page *page;
 723
 724         if (WARN_ON(pgoff >= mdev_state->pagecount))
 725                 return NULL;
 726
 727         mutex_lock(&mdev_state->ops_lock);
 728         page = __mbochs_get_page(mdev_state, pgoff);
 729         mutex_unlock(&mdev_state->ops_lock);
 730
 731         return page;
 732 }
 733
 734 static void mbochs_put_pages(struct mdev_state *mdev_state)
 735 {
 736         struct device *dev = mdev_dev(mdev_state->mdev);
 737         int i, count = 0;
 738
 739         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 740
 741         for (i = 0; i < mdev_state->pagecount; i++) {
 742                 if (!mdev_state->pages[i])
 743                         continue;
 744                 put_page(mdev_state->pages[i]);
 745                 mdev_state->pages[i] = NULL;
 746                 count++;
 747         }
 748         dev_dbg(dev, "%s: %d pages released\n", __func__, count);
 749 }
 750
 751 static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf)
 752 {
 753         struct vm_area_struct *vma = vmf->vma;
 754         struct mdev_state *mdev_state = vma->vm_private_data;
 755         pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 756
 757         if (page_offset >= mdev_state->pagecount)
 758                 return VM_FAULT_SIGBUS;
 759
 760         vmf->page = mbochs_get_page(mdev_state, page_offset);
 761         if (!vmf->page)
 762                 return VM_FAULT_SIGBUS;
 763
 764         return 0;
 765 }
 766
 767 static const struct vm_operations_struct mbochs_region_vm_ops = {
 768         .fault = mbochs_region_vm_fault,
 769 };
 770
 771 static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma)
 772 {
 773         struct mdev_state *mdev_state =
 774                 container_of(vdev, struct mdev_state, vdev);
 775
 776         if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
 777                 return -EINVAL;
 778         if (vma->vm_end < vma->vm_start)
 779                 return -EINVAL;
 780         if (vma->vm_end - vma->vm_start > mdev_state->memsize)
 781                 return -EINVAL;
 782         if ((vma->vm_flags & VM_SHARED) == 0)
 783                 return -EINVAL;
 784
 785         vma->vm_ops = &mbochs_region_vm_ops;
 786         vma->vm_private_data = mdev_state;
 787         return 0;
 788 }
 789
 790 static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf)
 791 {
 792         struct vm_area_struct *vma = vmf->vma;
 793         struct mbochs_dmabuf *dmabuf = vma->vm_private_data;
 794
 795         if (WARN_ON(vmf->pgoff >= dmabuf->pagecount))
 796                 return VM_FAULT_SIGBUS;
 797
 798         vmf->page = dmabuf->pages[vmf->pgoff];
 799         get_page(vmf->page);
 800         return 0;
 801 }
 802
 803 static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
 804         .fault = mbochs_dmabuf_vm_fault,
 805 };
 806
 807 static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
 808 {
 809         struct mbochs_dmabuf *dmabuf = buf->priv;
 810         struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
 811
 812         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
 813
 814         if ((vma->vm_flags & VM_SHARED) == 0)
 815                 return -EINVAL;
 816
 817         vma->vm_ops = &mbochs_dmabuf_vm_ops;
 818         vma->vm_private_data = dmabuf;
 819         return 0;
 820 }
 821
 822 static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf,
 823                                 const char *prefix)
 824 {
 825         struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
 826         u32 fourcc = dmabuf->mode.drm_format;
 827
 828         dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n",
 829                 prefix, dmabuf->id,
 830                 fourcc ? ((fourcc >>  0) & 0xff) : '-',
 831                 fourcc ? ((fourcc >>  8) & 0xff) : '-',
 832                 fourcc ? ((fourcc >> 16) & 0xff) : '-',
 833                 fourcc ? ((fourcc >> 24) & 0xff) : '-',
 834                 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride,
 835                 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount);
 836 }
 837
 838 static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at,
 839                                           enum dma_data_direction direction)
 840 {
 841         struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
 842         struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
 843         struct sg_table *sg;
 844
 845         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
 846
 847         sg = kzalloc(sizeof(*sg), GFP_KERNEL);
 848         if (!sg)
 849                 goto err1;
 850         if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount,
 851                                       0, dmabuf->mode.size, GFP_KERNEL) < 0)
 852                 goto err2;
 853         if (dma_map_sgtable(at->dev, sg, direction, 0))
 854                 goto err3;
 855
 856         return sg;
 857
 858 err3:
 859         sg_free_table(sg);
 860 err2:
 861         kfree(sg);
 862 err1:
 863         return ERR_PTR(-ENOMEM);
 864 }
 865
 866 static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at,
 867                                 struct sg_table *sg,
 868                                 enum dma_data_direction direction)
 869 {
 870         struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
 871         struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
 872
 873         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
 874
 875         dma_unmap_sgtable(at->dev, sg, direction, 0);
 876         sg_free_table(sg);
 877         kfree(sg);
 878 }
 879
 880 static void mbochs_release_dmabuf(struct dma_buf *buf)
 881 {
 882         struct mbochs_dmabuf *dmabuf = buf->priv;
 883         struct mdev_state *mdev_state = dmabuf->mdev_state;
 884         struct device *dev = mdev_dev(mdev_state->mdev);
 885         pgoff_t pg;
 886
 887         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
 888
 889         for (pg = 0; pg < dmabuf->pagecount; pg++)
 890                 put_page(dmabuf->pages[pg]);
 891
 892         mutex_lock(&mdev_state->ops_lock);
 893         dmabuf->buf = NULL;
 894         if (dmabuf->unlinked)
 895                 kfree(dmabuf);
 896         mutex_unlock(&mdev_state->ops_lock);
 897 }
 898
 899 static struct dma_buf_ops mbochs_dmabuf_ops = {
 900         .map_dma_buf      = mbochs_map_dmabuf,
 901         .unmap_dma_buf    = mbochs_unmap_dmabuf,
 902         .release          = mbochs_release_dmabuf,
 903         .mmap             = mbochs_mmap_dmabuf,
 904 };
 905
 906 static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state,
 907                                                  struct mbochs_mode *mode)
 908 {
 909         struct mbochs_dmabuf *dmabuf;
 910         pgoff_t page_offset, pg;
 911
 912         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 913
 914         dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL);
 915         if (!dmabuf)
 916                 return NULL;
 917
 918         dmabuf->mode = *mode;
 919         dmabuf->id = mdev_state->next_id++;
 920         dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE);
 921         dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *),
 922                                 GFP_KERNEL);
 923         if (!dmabuf->pages)
 924                 goto err_free_dmabuf;
 925
 926         page_offset = dmabuf->mode.offset >> PAGE_SHIFT;
 927         for (pg = 0; pg < dmabuf->pagecount; pg++) {
 928                 dmabuf->pages[pg] = __mbochs_get_page(mdev_state,
 929                                                       page_offset + pg);
 930                 if (!dmabuf->pages[pg])
 931                         goto err_free_pages;
 932         }
 933
 934         dmabuf->mdev_state = mdev_state;
 935         list_add(&dmabuf->next, &mdev_state->dmabufs);
 936
 937         mbochs_print_dmabuf(dmabuf, __func__);
 938         return dmabuf;
 939
 940 err_free_pages:
 941         while (pg > 0)
 942                 put_page(dmabuf->pages[--pg]);
 943         kfree(dmabuf->pages);
 944 err_free_dmabuf:
 945         kfree(dmabuf);
 946         return NULL;
 947 }
 948
 949 static struct mbochs_dmabuf *
 950 mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state,
 951                            struct mbochs_mode *mode)
 952 {
 953         struct mbochs_dmabuf *dmabuf;
 954
 955         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 956
 957         list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
 958                 if (mbochs_modes_equal(&dmabuf->mode, mode))
 959                         return dmabuf;
 960
 961         return NULL;
 962 }
 963
 964 static struct mbochs_dmabuf *
 965 mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
 966 {
 967         struct mbochs_dmabuf *dmabuf;
 968
 969         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 970
 971         list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
 972                 if (dmabuf->id == id)
 973                         return dmabuf;
 974
 975         return NULL;
 976 }
 977
 978 static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
 979 {
 980         struct mdev_state *mdev_state = dmabuf->mdev_state;
 981         struct device *dev = mdev_state->vdev.dev;
 982         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 983         struct dma_buf *buf;
 984
 985         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
 986
 987         if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) {
 988                 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n",
 989                                      __func__);
 990                 return -EINVAL;
 991         }
 992
 993         exp_info.ops = &mbochs_dmabuf_ops;
 994         exp_info.size = dmabuf->mode.size;
 995         exp_info.priv = dmabuf;
 996
 997         buf = dma_buf_export(&exp_info);
 998         if (IS_ERR(buf)) {
 999                 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n",
1000                                      __func__, PTR_ERR(buf));
1001                 return PTR_ERR(buf);
1002         }
1003
1004         dmabuf->buf = buf;
1005         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
1006         return 0;
1007 }
1008
1009 static int mbochs_get_region_info(struct mdev_state *mdev_state,
1010                                   struct vfio_region_info_ext *ext)
1011 {
1012         struct vfio_region_info *region_info = &ext->base;
1013
1014         if (region_info->index >= MBOCHS_NUM_REGIONS)
1015                 return -EINVAL;
1016
1017         switch (region_info->index) {
1018         case VFIO_PCI_CONFIG_REGION_INDEX:
1019                 region_info->offset = 0;
1020                 region_info->size   = MBOCHS_CONFIG_SPACE_SIZE;
1021                 region_info->flags  = (VFIO_REGION_INFO_FLAG_READ |
1022                                        VFIO_REGION_INFO_FLAG_WRITE);
1023                 break;
1024         case VFIO_PCI_BAR0_REGION_INDEX:
1025                 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET;
1026                 region_info->size   = mdev_state->memsize;
1027                 region_info->flags  = (VFIO_REGION_INFO_FLAG_READ  |
1028                                        VFIO_REGION_INFO_FLAG_WRITE |
1029                                        VFIO_REGION_INFO_FLAG_MMAP);
1030                 break;
1031         case VFIO_PCI_BAR2_REGION_INDEX:
1032                 region_info->offset = MBOCHS_MMIO_BAR_OFFSET;
1033                 region_info->size   = MBOCHS_MMIO_BAR_SIZE;
1034                 region_info->flags  = (VFIO_REGION_INFO_FLAG_READ  |
1035                                        VFIO_REGION_INFO_FLAG_WRITE);
1036                 break;
1037         case MBOCHS_EDID_REGION_INDEX:
1038                 ext->base.argsz = sizeof(*ext);
1039                 ext->base.offset = MBOCHS_EDID_OFFSET;
1040                 ext->base.size = MBOCHS_EDID_SIZE;
1041                 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ  |
1042                                    VFIO_REGION_INFO_FLAG_WRITE |
1043                                    VFIO_REGION_INFO_FLAG_CAPS);
1044                 ext->base.cap_offset = offsetof(typeof(*ext), type);
1045                 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE;
1046                 ext->type.header.version = 1;
1047                 ext->type.header.next = 0;
1048                 ext->type.type = VFIO_REGION_TYPE_GFX;
1049                 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID;
1050                 break;
1051         default:
1052                 region_info->size   = 0;
1053                 region_info->offset = 0;
1054                 region_info->flags  = 0;
1055         }
1056
1057         return 0;
1058 }
1059
1060 static int mbochs_get_irq_info(struct vfio_irq_info *irq_info)
1061 {
1062         irq_info->count = 0;
1063         return 0;
1064 }
1065
1066 static int mbochs_get_device_info(struct vfio_device_info *dev_info)
1067 {
1068         dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
1069         dev_info->num_regions = MBOCHS_NUM_REGIONS;
1070         dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
1071         return 0;
1072 }
1073
1074 static int mbochs_query_gfx_plane(struct mdev_state *mdev_state,
1075                                   struct vfio_device_gfx_plane_info *plane)
1076 {
1077         struct mbochs_dmabuf *dmabuf;
1078         struct mbochs_mode mode;
1079         int ret;
1080
1081         if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
1082                 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
1083                                      VFIO_GFX_PLANE_TYPE_DMABUF))
1084                         return 0;
1085                 return -EINVAL;
1086         }
1087
1088         if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF)
1089                 return -EINVAL;
1090
1091         plane->drm_format_mod = 0;
1092         plane->x_pos          = 0;
1093         plane->y_pos          = 0;
1094         plane->x_hot          = 0;
1095         plane->y_hot          = 0;
1096
1097         mutex_lock(&mdev_state->ops_lock);
1098
1099         ret = -EINVAL;
1100         if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY)
1101                 ret = mbochs_check_framebuffer(mdev_state, &mode);
1102         if (ret < 0) {
1103                 plane->drm_format     = 0;
1104                 plane->width          = 0;
1105                 plane->height         = 0;
1106                 plane->stride         = 0;
1107                 plane->size           = 0;
1108                 plane->dmabuf_id      = 0;
1109                 goto done;
1110         }
1111
1112         dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode);
1113         if (!dmabuf)
1114                 mbochs_dmabuf_alloc(mdev_state, &mode);
1115         if (!dmabuf) {
1116                 mutex_unlock(&mdev_state->ops_lock);
1117                 return -ENOMEM;
1118         }
1119
1120         plane->drm_format     = dmabuf->mode.drm_format;
1121         plane->width          = dmabuf->mode.width;
1122         plane->height         = dmabuf->mode.height;
1123         plane->stride         = dmabuf->mode.stride;
1124         plane->size           = dmabuf->mode.size;
1125         plane->dmabuf_id      = dmabuf->id;
1126
1127 done:
1128         if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY &&
1129             mdev_state->active_id != plane->dmabuf_id) {
1130                 dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n",
1131                         __func__, mdev_state->active_id, plane->dmabuf_id);
1132                 mdev_state->active_id = plane->dmabuf_id;
1133         }
1134         mutex_unlock(&mdev_state->ops_lock);
1135         return 0;
1136 }
1137
1138 static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id)
1139 {
1140         struct mbochs_dmabuf *dmabuf;
1141
1142         mutex_lock(&mdev_state->ops_lock);
1143
1144         dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id);
1145         if (!dmabuf) {
1146                 mutex_unlock(&mdev_state->ops_lock);
1147                 return -ENOENT;
1148         }
1149
1150         if (!dmabuf->buf)
1151                 mbochs_dmabuf_export(dmabuf);
1152
1153         mutex_unlock(&mdev_state->ops_lock);
1154
1155         if (!dmabuf->buf)
1156                 return -EINVAL;
1157
1158         return dma_buf_fd(dmabuf->buf, 0);
1159 }
1160
1161 static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd,
1162                          unsigned long arg)
1163 {
1164         struct mdev_state *mdev_state =
1165                 container_of(vdev, struct mdev_state, vdev);
1166         int ret = 0;
1167         unsigned long minsz, outsz;
1168
1169         switch (cmd) {
1170         case VFIO_DEVICE_GET_INFO:
1171         {
1172                 struct vfio_device_info info;
1173
1174                 minsz = offsetofend(struct vfio_device_info, num_irqs);
1175
1176                 if (copy_from_user(&info, (void __user *)arg, minsz))
1177                         return -EFAULT;
1178
1179                 if (info.argsz < minsz)
1180                         return -EINVAL;
1181
1182                 ret = mbochs_get_device_info(&info);
1183                 if (ret)
1184                         return ret;
1185
1186                 if (copy_to_user((void __user *)arg, &info, minsz))
1187                         return -EFAULT;
1188
1189                 return 0;
1190         }
1191         case VFIO_DEVICE_GET_REGION_INFO:
1192         {
1193                 struct vfio_region_info_ext info;
1194
1195                 minsz = offsetofend(typeof(info), base.offset);
1196
1197                 if (copy_from_user(&info, (void __user *)arg, minsz))
1198                         return -EFAULT;
1199
1200                 outsz = info.base.argsz;
1201                 if (outsz < minsz)
1202                         return -EINVAL;
1203                 if (outsz > sizeof(info))
1204                         return -EINVAL;
1205
1206                 ret = mbochs_get_region_info(mdev_state, &info);
1207                 if (ret)
1208                         return ret;
1209
1210                 if (copy_to_user((void __user *)arg, &info, outsz))
1211                         return -EFAULT;
1212
1213                 return 0;
1214         }
1215
1216         case VFIO_DEVICE_GET_IRQ_INFO:
1217         {
1218                 struct vfio_irq_info info;
1219
1220                 minsz = offsetofend(struct vfio_irq_info, count);
1221
1222                 if (copy_from_user(&info, (void __user *)arg, minsz))
1223                         return -EFAULT;
1224
1225                 if ((info.argsz < minsz) ||
1226                     (info.index >= VFIO_PCI_NUM_IRQS))
1227                         return -EINVAL;
1228
1229                 ret = mbochs_get_irq_info(&info);
1230                 if (ret)
1231                         return ret;
1232
1233                 if (copy_to_user((void __user *)arg, &info, minsz))
1234                         return -EFAULT;
1235
1236                 return 0;
1237         }
1238
1239         case VFIO_DEVICE_QUERY_GFX_PLANE:
1240         {
1241                 struct vfio_device_gfx_plane_info plane;
1242
1243                 minsz = offsetofend(struct vfio_device_gfx_plane_info,
1244                                     region_index);
1245
1246                 if (copy_from_user(&plane, (void __user *)arg, minsz))
1247                         return -EFAULT;
1248
1249                 if (plane.argsz < minsz)
1250                         return -EINVAL;
1251
1252                 ret = mbochs_query_gfx_plane(mdev_state, &plane);
1253                 if (ret)
1254                         return ret;
1255
1256                 if (copy_to_user((void __user *)arg, &plane, minsz))
1257                         return -EFAULT;
1258
1259                 return 0;
1260         }
1261
1262         case VFIO_DEVICE_GET_GFX_DMABUF:
1263         {
1264                 u32 dmabuf_id;
1265
1266                 if (get_user(dmabuf_id, (__u32 __user *)arg))
1267                         return -EFAULT;
1268
1269                 return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id);
1270         }
1271
1272         case VFIO_DEVICE_SET_IRQS:
1273                 return -EINVAL;
1274
1275         case VFIO_DEVICE_RESET:
1276                 return mbochs_reset(mdev_state);
1277         }
1278         return -ENOTTY;
1279 }
1280
1281 static void mbochs_close_device(struct vfio_device *vdev)
1282 {
1283         struct mdev_state *mdev_state =
1284                 container_of(vdev, struct mdev_state, vdev);
1285         struct mbochs_dmabuf *dmabuf, *tmp;
1286
1287         mutex_lock(&mdev_state->ops_lock);
1288
1289         list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) {
1290                 list_del(&dmabuf->next);
1291                 if (dmabuf->buf) {
1292                         /* free in mbochs_release_dmabuf() */
1293                         dmabuf->unlinked = true;
1294                 } else {
1295                         kfree(dmabuf);
1296                 }
1297         }
1298         mbochs_put_pages(mdev_state);
1299
1300         mutex_unlock(&mdev_state->ops_lock);
1301 }
1302
1303 static ssize_t
1304 memory_show(struct device *dev, struct device_attribute *attr,
1305             char *buf)
1306 {
1307         struct mdev_state *mdev_state = dev_get_drvdata(dev);
1308
1309         return sprintf(buf, "%d MB\n", mdev_state->type->mbytes);
1310 }
1311 static DEVICE_ATTR_RO(memory);
1312
1313 static struct attribute *mdev_dev_attrs[] = {
1314         &dev_attr_memory.attr,
1315         NULL,
1316 };
1317
1318 static const struct attribute_group mdev_dev_group = {
1319         .name  = "vendor",
1320         .attrs = mdev_dev_attrs,
1321 };
1322
1323 static const struct attribute_group *mdev_dev_groups[] = {
1324         &mdev_dev_group,
1325         NULL,
1326 };
1327
1328 static ssize_t name_show(struct mdev_type *mtype,
1329                          struct mdev_type_attribute *attr, char *buf)
1330 {
1331         const struct mbochs_type *type =
1332                 &mbochs_types[mtype_get_type_group_id(mtype)];
1333
1334         return sprintf(buf, "%s\n", type->name);
1335 }
1336 static MDEV_TYPE_ATTR_RO(name);
1337
1338 static ssize_t description_show(struct mdev_type *mtype,
1339                                 struct mdev_type_attribute *attr, char *buf)
1340 {
1341         const struct mbochs_type *type =
1342                 &mbochs_types[mtype_get_type_group_id(mtype)];
1343
1344         return sprintf(buf, "virtual display, %d MB video memory\n",
1345                        type ? type->mbytes  : 0);
1346 }
1347 static MDEV_TYPE_ATTR_RO(description);
1348
1349 static ssize_t available_instances_show(struct mdev_type *mtype,
1350                                         struct mdev_type_attribute *attr,
1351                                         char *buf)
1352 {
1353         const struct mbochs_type *type =
1354                 &mbochs_types[mtype_get_type_group_id(mtype)];
1355         int count = atomic_read(&mbochs_avail_mbytes) / type->mbytes;
1356
1357         return sprintf(buf, "%d\n", count);
1358 }
1359 static MDEV_TYPE_ATTR_RO(available_instances);
1360
1361 static ssize_t device_api_show(struct mdev_type *mtype,
1362                                struct mdev_type_attribute *attr, char *buf)
1363 {
1364         return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
1365 }
1366 static MDEV_TYPE_ATTR_RO(device_api);
1367
1368 static struct attribute *mdev_types_attrs[] = {
1369         &mdev_type_attr_name.attr,
1370         &mdev_type_attr_description.attr,
1371         &mdev_type_attr_device_api.attr,
1372         &mdev_type_attr_available_instances.attr,
1373         NULL,
1374 };
1375
1376 static struct attribute_group mdev_type_group1 = {
1377         .name  = MBOCHS_TYPE_1,
1378         .attrs = mdev_types_attrs,
1379 };
1380
1381 static struct attribute_group mdev_type_group2 = {
1382         .name  = MBOCHS_TYPE_2,
1383         .attrs = mdev_types_attrs,
1384 };
1385
1386 static struct attribute_group mdev_type_group3 = {
1387         .name  = MBOCHS_TYPE_3,
1388         .attrs = mdev_types_attrs,
1389 };
1390
1391 static struct attribute_group *mdev_type_groups[] = {
1392         &mdev_type_group1,
1393         &mdev_type_group2,
1394         &mdev_type_group3,
1395         NULL,
1396 };
1397
1398 static const struct vfio_device_ops mbochs_dev_ops = {
1399         .close_device = mbochs_close_device,
1400         .read = mbochs_read,
1401         .write = mbochs_write,
1402         .ioctl = mbochs_ioctl,
1403         .mmap = mbochs_mmap,
1404 };
1405
1406 static struct mdev_driver mbochs_driver = {
1407         .driver = {
1408                 .name = "mbochs",
1409                 .owner = THIS_MODULE,
1410                 .mod_name = KBUILD_MODNAME,
1411                 .dev_groups = mdev_dev_groups,
1412         },
1413         .probe = mbochs_probe,
1414         .remove = mbochs_remove,
1415         .supported_type_groups = mdev_type_groups,
1416 };
1417
1418 static const struct file_operations vd_fops = {
1419         .owner          = THIS_MODULE,
1420 };
1421
1422 static void mbochs_device_release(struct device *dev)
1423 {
1424         /* nothing */
1425 }
1426
1427 static int __init mbochs_dev_init(void)
1428 {
1429         int ret = 0;
1430
1431         atomic_set(&mbochs_avail_mbytes, max_mbytes);
1432
1433         ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
1434         if (ret < 0) {
1435                 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
1436                 return ret;
1437         }
1438         cdev_init(&mbochs_cdev, &vd_fops);
1439         cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
1440         pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
1441
1442         ret = mdev_register_driver(&mbochs_driver);
1443         if (ret)
1444                 goto err_cdev;
1445
1446         mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
1447         if (IS_ERR(mbochs_class)) {
1448                 pr_err("Error: failed to register mbochs_dev class\n");
1449                 ret = PTR_ERR(mbochs_class);
1450                 goto err_driver;
1451         }
1452         mbochs_dev.class = mbochs_class;
1453         mbochs_dev.release = mbochs_device_release;
1454         dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME);
1455
1456         ret = device_register(&mbochs_dev);
1457         if (ret)
1458                 goto err_class;
1459
1460         ret = mdev_register_device(&mbochs_dev, &mbochs_driver);
1461         if (ret)
1462                 goto err_device;
1463
1464         return 0;
1465
1466 err_device:
1467         device_unregister(&mbochs_dev);
1468 err_class:
1469         class_destroy(mbochs_class);
1470 err_driver:
1471         mdev_unregister_driver(&mbochs_driver);
1472 err_cdev:
1473         cdev_del(&mbochs_cdev);
1474         unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1475         return ret;
1476 }
1477
1478 static void __exit mbochs_dev_exit(void)
1479 {
1480         mbochs_dev.bus = NULL;
1481         mdev_unregister_device(&mbochs_dev);
1482
1483         device_unregister(&mbochs_dev);
1484         mdev_unregister_driver(&mbochs_driver);
1485         cdev_del(&mbochs_cdev);
1486         unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1487         class_destroy(mbochs_class);
1488         mbochs_class = NULL;
1489 }
1490
1491 MODULE_IMPORT_NS(DMA_BUF);
1492 module_init(mbochs_dev_init)
1493 module_exit(mbochs_dev_exit)