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