linux/samples/vfio-mdev/mbochs.c
<<
>>
Prefs
   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
  92MODULE_LICENSE("GPL v2");
  93
  94static int max_mbytes = 256;
  95module_param_named(count, max_mbytes, int, 0444);
  96MODULE_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
 103static 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
 128static dev_t            mbochs_devt;
 129static struct class     *mbochs_class;
 130static struct cdev      mbochs_cdev;
 131static struct device    mbochs_dev;
 132static int              mbochs_used_mbytes;
 133static const struct vfio_device_ops mbochs_dev_ops;
 134
 135struct vfio_region_info_ext {
 136        struct vfio_region_info          base;
 137        struct vfio_region_info_cap_type type;
 138};
 139
 140struct 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
 151struct 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 */
 163struct 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
 184static 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
 198static 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
 205static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
 206                                      pgoff_t pgoff);
 207static struct page *mbochs_get_page(struct mdev_state *mdev_state,
 208                                    pgoff_t pgoff);
 209
 210static 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
 239static 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
 286nofb:
 287        memset(mode, 0, sizeof(*mode));
 288        return -EINVAL;
 289}
 290
 291static 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
 297static 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
 325static 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:
 348unhandled:
 349                dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
 350                        __func__, offset, count);
 351                break;
 352        }
 353}
 354
 355static 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:
 384unhandled:
 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
 392static 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
 419static 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
 430static 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
 490accessfailed:
 491        mutex_unlock(&mdev_state->ops_lock);
 492
 493        return ret;
 494}
 495
 496static 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
 508static 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
 560err_mem:
 561        kfree(mdev_state->vconfig);
 562        kfree(mdev_state);
 563        return ret;
 564}
 565
 566static 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
 577static 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
 634read_err:
 635        return -EFAULT;
 636}
 637
 638static 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;
 693write_err:
 694        return -EFAULT;
 695}
 696
 697static 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
 713static 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
 728static 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
 745static 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
 761static const struct vm_operations_struct mbochs_region_vm_ops = {
 762        .fault = mbochs_region_vm_fault,
 763};
 764
 765static 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
 784static 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
 797static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
 798        .fault = mbochs_dmabuf_vm_fault,
 799};
 800
 801static 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
 816static 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
 832static 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
 852err3:
 853        sg_free_table(sg);
 854err2:
 855        kfree(sg);
 856err1:
 857        return ERR_PTR(-ENOMEM);
 858}
 859
 860static 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
 874static 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
 893static 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
 900static 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
 934err_free_pages:
 935        while (pg > 0)
 936                put_page(dmabuf->pages[--pg]);
 937        kfree(dmabuf->pages);
 938err_free_dmabuf:
 939        kfree(dmabuf);
 940        return NULL;
 941}
 942
 943static struct mbochs_dmabuf *
 944mbochs_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
 958static struct mbochs_dmabuf *
 959mbochs_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
 972static 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
1003static 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
1054static int mbochs_get_irq_info(struct vfio_irq_info *irq_info)
1055{
1056        irq_info->count = 0;
1057        return 0;
1058}
1059
1060static 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
1068static 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
1121done:
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
1132static 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
1155static 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
1275static int mbochs_open(struct vfio_device *vdev)
1276{
1277        if (!try_module_get(THIS_MODULE))
1278                return -ENODEV;
1279
1280        return 0;
1281}
1282
1283static 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
1306static ssize_t
1307memory_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}
1314static DEVICE_ATTR_RO(memory);
1315
1316static struct attribute *mdev_dev_attrs[] = {
1317        &dev_attr_memory.attr,
1318        NULL,
1319};
1320
1321static const struct attribute_group mdev_dev_group = {
1322        .name  = "vendor",
1323        .attrs = mdev_dev_attrs,
1324};
1325
1326static const struct attribute_group *mdev_dev_groups[] = {
1327        &mdev_dev_group,
1328        NULL,
1329};
1330
1331static 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}
1339static MDEV_TYPE_ATTR_RO(name);
1340
1341static 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}
1350static MDEV_TYPE_ATTR_RO(description);
1351
1352static 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}
1362static MDEV_TYPE_ATTR_RO(available_instances);
1363
1364static 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}
1369static MDEV_TYPE_ATTR_RO(device_api);
1370
1371static 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
1379static struct attribute_group mdev_type_group1 = {
1380        .name  = MBOCHS_TYPE_1,
1381        .attrs = mdev_types_attrs,
1382};
1383
1384static struct attribute_group mdev_type_group2 = {
1385        .name  = MBOCHS_TYPE_2,
1386        .attrs = mdev_types_attrs,
1387};
1388
1389static struct attribute_group mdev_type_group3 = {
1390        .name  = MBOCHS_TYPE_3,
1391        .attrs = mdev_types_attrs,
1392};
1393
1394static struct attribute_group *mdev_type_groups[] = {
1395        &mdev_type_group1,
1396        &mdev_type_group2,
1397        &mdev_type_group3,
1398        NULL,
1399};
1400
1401static 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
1410static 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
1421static 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
1427static const struct file_operations vd_fops = {
1428        .owner          = THIS_MODULE,
1429};
1430
1431static void mbochs_device_release(struct device *dev)
1432{
1433        /* nothing */
1434}
1435
1436static 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
1473err_device:
1474        device_unregister(&mbochs_dev);
1475err_class:
1476        class_destroy(mbochs_class);
1477err_driver:
1478        mdev_unregister_driver(&mbochs_driver);
1479err_cdev:
1480        cdev_del(&mbochs_cdev);
1481        unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1482        return ret;
1483}
1484
1485static 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
1498module_init(mbochs_dev_init)
1499module_exit(mbochs_dev_exit)
1500
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.