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