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