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_LICENSE("GPL v2"); 92 93static int max_mbytes = 256; 94module_param_named(count, max_mbytes, int, 0444); 95MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices"); 96 97 98#define MBOCHS_TYPE_1 "small" 99#define MBOCHS_TYPE_2 "medium" 100#define MBOCHS_TYPE_3 "large" 101 102static struct mbochs_type { 103 struct mdev_type type; 104 u32 mbytes; 105 u32 max_x; 106 u32 max_y; 107} mbochs_types[] = { 108 { 109 .type.sysfs_name = MBOCHS_TYPE_1, 110 .type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1, 111 .mbytes = 4, 112 .max_x = 800, 113 .max_y = 600, 114 }, { 115 .type.sysfs_name = MBOCHS_TYPE_2, 116 .type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2, 117 .mbytes = 16, 118 .max_x = 1920, 119 .max_y = 1440, 120 }, { 121 .type.sysfs_name = MBOCHS_TYPE_3, 122 .type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3, 123 .mbytes = 64, 124 .max_x = 0, 125 .max_y = 0, 126 }, 127}; 128 129static struct mdev_type *mbochs_mdev_types[] = { 130 &mbochs_types[0].type, 131 &mbochs_types[1].type, 132 &mbochs_types[2].type, 133}; 134 135static dev_t mbochs_devt; 136static const struct class mbochs_class = { 137 .name = MBOCHS_CLASS_NAME, 138}; 139static struct cdev mbochs_cdev; 140static struct device mbochs_dev; 141static struct mdev_parent mbochs_parent; 142static atomic_t mbochs_avail_mbytes; 143static const struct vfio_device_ops mbochs_dev_ops; 144 145struct vfio_region_info_ext { 146 struct vfio_region_info base; 147 struct vfio_region_info_cap_type type; 148}; 149 150struct mbochs_mode { 151 u32 drm_format; 152 u32 bytepp; 153 u32 width; 154 u32 height; 155 u32 stride; 156 u32 __pad; 157 u64 offset; 158 u64 size; 159}; 160 161struct mbochs_dmabuf { 162 struct mbochs_mode mode; 163 u32 id; 164 struct page **pages; 165 pgoff_t pagecount; 166 struct dma_buf *buf; 167 struct mdev_state *mdev_state; 168 struct list_head next; 169 bool unlinked; 170}; 171 172/* State of each mdev device */ 173struct mdev_state { 174 struct vfio_device vdev; 175 u8 *vconfig; 176 u64 bar_mask[3]; 177 u32 memory_bar_mask; 178 struct mutex ops_lock; 179 struct mdev_device *mdev; 180 181 const struct mbochs_type *type; 182 u16 vbe[VBE_DISPI_INDEX_COUNT]; 183 u64 memsize; 184 struct page **pages; 185 pgoff_t pagecount; 186 struct vfio_region_gfx_edid edid_regs; 187 u8 edid_blob[0x400]; 188 189 struct list_head dmabufs; 190 u32 active_id; 191 u32 next_id; 192}; 193 194static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = { 195 [VBE_DISPI_INDEX_ID] = "id", 196 [VBE_DISPI_INDEX_XRES] = "xres", 197 [VBE_DISPI_INDEX_YRES] = "yres", 198 [VBE_DISPI_INDEX_BPP] = "bpp", 199 [VBE_DISPI_INDEX_ENABLE] = "enable", 200 [VBE_DISPI_INDEX_BANK] = "bank", 201 [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width", 202 [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height", 203 [VBE_DISPI_INDEX_X_OFFSET] = "x-offset", 204 [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset", 205 [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem", 206}; 207 208static const char *vbe_name(u32 index) 209{ 210 if (index < ARRAY_SIZE(vbe_name_list)) 211 return vbe_name_list[index]; 212 return "(invalid)"; 213} 214 215static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 216 pgoff_t pgoff); 217static struct page *mbochs_get_page(struct mdev_state *mdev_state, 218 pgoff_t pgoff); 219 220static void mbochs_create_config_space(struct mdev_state *mdev_state) 221{ 222 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID], 223 0x1234); 224 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID], 225 0x1111); 226 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID], 227 PCI_SUBVENDOR_ID_REDHAT_QUMRANET); 228 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID], 229 PCI_SUBDEVICE_ID_QEMU); 230 231 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND], 232 PCI_COMMAND_IO | PCI_COMMAND_MEMORY); 233 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE], 234 PCI_CLASS_DISPLAY_OTHER); 235 mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01; 236 237 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0], 238 PCI_BASE_ADDRESS_SPACE_MEMORY | 239 PCI_BASE_ADDRESS_MEM_TYPE_32 | 240 PCI_BASE_ADDRESS_MEM_PREFETCH); 241 mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1; 242 243 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2], 244 PCI_BASE_ADDRESS_SPACE_MEMORY | 245 PCI_BASE_ADDRESS_MEM_TYPE_32); 246 mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1; 247} 248 249static int mbochs_check_framebuffer(struct mdev_state *mdev_state, 250 struct mbochs_mode *mode) 251{ 252 struct device *dev = mdev_dev(mdev_state->mdev); 253 u16 *vbe = mdev_state->vbe; 254 u32 virt_width; 255 256 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 257 258 if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) 259 goto nofb; 260 261 memset(mode, 0, sizeof(*mode)); 262 switch (vbe[VBE_DISPI_INDEX_BPP]) { 263 case 32: 264 mode->drm_format = DRM_FORMAT_XRGB8888; 265 mode->bytepp = 4; 266 break; 267 default: 268 dev_info_ratelimited(dev, "%s: bpp %d not supported\n", 269 __func__, vbe[VBE_DISPI_INDEX_BPP]); 270 goto nofb; 271 } 272 273 mode->width = vbe[VBE_DISPI_INDEX_XRES]; 274 mode->height = vbe[VBE_DISPI_INDEX_YRES]; 275 virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH]; 276 if (virt_width < mode->width) 277 virt_width = mode->width; 278 mode->stride = virt_width * mode->bytepp; 279 mode->size = (u64)mode->stride * mode->height; 280 mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp + 281 (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride); 282 283 if (mode->width < 64 || mode->height < 64) { 284 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n", 285 __func__, mode->width, mode->height); 286 goto nofb; 287 } 288 if (mode->offset + mode->size > mdev_state->memsize) { 289 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n", 290 __func__); 291 goto nofb; 292 } 293 294 return 0; 295 296nofb: 297 memset(mode, 0, sizeof(*mode)); 298 return -EINVAL; 299} 300 301static bool mbochs_modes_equal(struct mbochs_mode *mode1, 302 struct mbochs_mode *mode2) 303{ 304 return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0; 305} 306 307static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset, 308 char *buf, u32 count) 309{ 310 struct device *dev = mdev_dev(mdev_state->mdev); 311 int index = (offset - PCI_BASE_ADDRESS_0) / 0x04; 312 u32 cfg_addr; 313 314 switch (offset) { 315 case PCI_BASE_ADDRESS_0: 316 case PCI_BASE_ADDRESS_2: 317 cfg_addr = *(u32 *)buf; 318 319 if (cfg_addr == 0xffffffff) { 320 cfg_addr = (cfg_addr & mdev_state->bar_mask[index]); 321 } else { 322 cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK; 323 if (cfg_addr) 324 dev_info(dev, "BAR #%d @ 0x%x\n", 325 index, cfg_addr); 326 } 327 328 cfg_addr |= (mdev_state->vconfig[offset] & 329 ~PCI_BASE_ADDRESS_MEM_MASK); 330 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr); 331 break; 332 } 333} 334 335static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset, 336 char *buf, u32 count) 337{ 338 struct device *dev = mdev_dev(mdev_state->mdev); 339 int index; 340 u16 reg16; 341 342 switch (offset) { 343 case 0x400 ... 0x41f: /* vga ioports remapped */ 344 goto unhandled; 345 case 0x500 ... 0x515: /* bochs dispi interface */ 346 if (count != 2) 347 goto unhandled; 348 index = (offset - 0x500) / 2; 349 reg16 = *(u16 *)buf; 350 if (index < ARRAY_SIZE(mdev_state->vbe)) 351 mdev_state->vbe[index] = reg16; 352 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n", 353 __func__, index, reg16, vbe_name(index)); 354 break; 355 case 0x600 ... 0x607: /* qemu extended regs */ 356 goto unhandled; 357 default: 358unhandled: 359 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", 360 __func__, offset, count); 361 break; 362 } 363} 364 365static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset, 366 char *buf, u32 count) 367{ 368 struct device *dev = mdev_dev(mdev_state->mdev); 369 struct vfio_region_gfx_edid *edid; 370 u16 reg16 = 0; 371 int index; 372 373 switch (offset) { 374 case 0x000 ... 0x3ff: /* edid block */ 375 edid = &mdev_state->edid_regs; 376 if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP || 377 offset >= edid->edid_size) { 378 memset(buf, 0, count); 379 break; 380 } 381 memcpy(buf, mdev_state->edid_blob + offset, count); 382 break; 383 case 0x500 ... 0x515: /* bochs dispi interface */ 384 if (count != 2) 385 goto unhandled; 386 index = (offset - 0x500) / 2; 387 if (index < ARRAY_SIZE(mdev_state->vbe)) 388 reg16 = mdev_state->vbe[index]; 389 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n", 390 __func__, index, reg16, vbe_name(index)); 391 *(u16 *)buf = reg16; 392 break; 393 default: 394unhandled: 395 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", 396 __func__, offset, count); 397 memset(buf, 0, count); 398 break; 399 } 400} 401 402static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset, 403 char *buf, u32 count, bool is_write) 404{ 405 char *regs = (void *)&mdev_state->edid_regs; 406 407 if (offset + count > sizeof(mdev_state->edid_regs)) 408 return; 409 if (count != 4) 410 return; 411 if (offset % 4) 412 return; 413 414 if (is_write) { 415 switch (offset) { 416 case offsetof(struct vfio_region_gfx_edid, link_state): 417 case offsetof(struct vfio_region_gfx_edid, edid_size): 418 memcpy(regs + offset, buf, count); 419 break; 420 default: 421 /* read-only regs */ 422 break; 423 } 424 } else { 425 memcpy(buf, regs + offset, count); 426 } 427} 428 429static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset, 430 char *buf, u32 count, bool is_write) 431{ 432 if (offset + count > mdev_state->edid_regs.edid_max_size) 433 return; 434 if (is_write) 435 memcpy(mdev_state->edid_blob + offset, buf, count); 436 else 437 memcpy(buf, mdev_state->edid_blob + offset, count); 438} 439 440static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf, 441 size_t count, loff_t pos, bool is_write) 442{ 443 struct page *pg; 444 loff_t poff; 445 char *map; 446 int ret = 0; 447 448 mutex_lock(&mdev_state->ops_lock); 449 450 if (pos < MBOCHS_CONFIG_SPACE_SIZE) { 451 if (is_write) 452 handle_pci_cfg_write(mdev_state, pos, buf, count); 453 else 454 memcpy(buf, (mdev_state->vconfig + pos), count); 455 456 } else if (pos >= MBOCHS_MMIO_BAR_OFFSET && 457 pos + count <= (MBOCHS_MMIO_BAR_OFFSET + 458 MBOCHS_MMIO_BAR_SIZE)) { 459 pos -= MBOCHS_MMIO_BAR_OFFSET; 460 if (is_write) 461 handle_mmio_write(mdev_state, pos, buf, count); 462 else 463 handle_mmio_read(mdev_state, pos, buf, count); 464 465 } else if (pos >= MBOCHS_EDID_OFFSET && 466 pos + count <= (MBOCHS_EDID_OFFSET + 467 MBOCHS_EDID_SIZE)) { 468 pos -= MBOCHS_EDID_OFFSET; 469 if (pos < MBOCHS_EDID_BLOB_OFFSET) { 470 handle_edid_regs(mdev_state, pos, buf, count, is_write); 471 } else { 472 pos -= MBOCHS_EDID_BLOB_OFFSET; 473 handle_edid_blob(mdev_state, pos, buf, count, is_write); 474 } 475 476 } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET && 477 pos + count <= 478 MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) { 479 pos -= MBOCHS_MMIO_BAR_OFFSET; 480 poff = pos & ~PAGE_MASK; 481 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT); 482 map = kmap(pg); 483 if (is_write) 484 memcpy(map + poff, buf, count); 485 else 486 memcpy(buf, map + poff, count); 487 kunmap(pg); 488 put_page(pg); 489 490 } else { 491 dev_dbg(mdev_state->vdev.dev, "%s: %s @0x%llx (unhandled)\n", 492 __func__, is_write ? "WR" : "RD", pos); 493 ret = -1; 494 goto accessfailed; 495 } 496 497 ret = count; 498 499 500accessfailed: 501 mutex_unlock(&mdev_state->ops_lock); 502 503 return ret; 504} 505 506static int mbochs_reset(struct mdev_state *mdev_state) 507{ 508 u32 size64k = mdev_state->memsize / (64 * 1024); 509 int i; 510 511 for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++) 512 mdev_state->vbe[i] = 0; 513 mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5; 514 mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k; 515 return 0; 516} 517 518static int mbochs_init_dev(struct vfio_device *vdev) 519{ 520 struct mdev_state *mdev_state = 521 container_of(vdev, struct mdev_state, vdev); 522 struct mdev_device *mdev = to_mdev_device(vdev->dev); 523 struct mbochs_type *type = 524 container_of(mdev->type, struct mbochs_type, type); 525 int avail_mbytes = atomic_read(&mbochs_avail_mbytes); 526 int ret = -ENOMEM; 527 528 do { 529 if (avail_mbytes < type->mbytes) 530 return -ENOSPC; 531 } while (!atomic_try_cmpxchg(&mbochs_avail_mbytes, &avail_mbytes, 532 avail_mbytes - type->mbytes)); 533 534 mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL); 535 if (!mdev_state->vconfig) 536 goto err_avail; 537 538 mdev_state->memsize = type->mbytes * 1024 * 1024; 539 mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT; 540 mdev_state->pages = kcalloc(mdev_state->pagecount, 541 sizeof(struct page *), 542 GFP_KERNEL); 543 if (!mdev_state->pages) 544 goto err_vconfig; 545 546 mutex_init(&mdev_state->ops_lock); 547 mdev_state->mdev = mdev; 548 INIT_LIST_HEAD(&mdev_state->dmabufs); 549 mdev_state->next_id = 1; 550 551 mdev_state->type = type; 552 mdev_state->edid_regs.max_xres = type->max_x; 553 mdev_state->edid_regs.max_yres = type->max_y; 554 mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET; 555 mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob); 556 mbochs_create_config_space(mdev_state); 557 mbochs_reset(mdev_state); 558 559 dev_info(vdev->dev, "%s: %s, %d MB, %ld pages\n", __func__, 560 type->type.pretty_name, type->mbytes, mdev_state->pagecount); 561 return 0; 562 563err_vconfig: 564 kfree(mdev_state->vconfig); 565err_avail: 566 atomic_add(type->mbytes, &mbochs_avail_mbytes); 567 return ret; 568} 569 570static int mbochs_probe(struct mdev_device *mdev) 571{ 572 struct mdev_state *mdev_state; 573 int ret = -ENOMEM; 574 575 mdev_state = vfio_alloc_device(mdev_state, vdev, &mdev->dev, 576 &mbochs_dev_ops); 577 if (IS_ERR(mdev_state)) 578 return PTR_ERR(mdev_state); 579 580 ret = vfio_register_emulated_iommu_dev(&mdev_state->vdev); 581 if (ret) 582 goto err_put_vdev; 583 dev_set_drvdata(&mdev->dev, mdev_state); 584 return 0; 585 586err_put_vdev: 587 vfio_put_device(&mdev_state->vdev); 588 return ret; 589} 590 591static void mbochs_release_dev(struct vfio_device *vdev) 592{ 593 struct mdev_state *mdev_state = 594 container_of(vdev, struct mdev_state, vdev); 595 596 atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes); 597 kfree(mdev_state->pages); 598 kfree(mdev_state->vconfig); 599} 600 601static void mbochs_remove(struct mdev_device *mdev) 602{ 603 struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev); 604 605 vfio_unregister_group_dev(&mdev_state->vdev); 606 vfio_put_device(&mdev_state->vdev); 607} 608 609static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf, 610 size_t count, loff_t *ppos) 611{ 612 struct mdev_state *mdev_state = 613 container_of(vdev, struct mdev_state, vdev); 614 unsigned int done = 0; 615 int ret; 616 617 while (count) { 618 size_t filled; 619 620 if (count >= 4 && !(*ppos % 4)) { 621 u32 val; 622 623 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 624 *ppos, false); 625 if (ret <= 0) 626 goto read_err; 627 628 if (copy_to_user(buf, &val, sizeof(val))) 629 goto read_err; 630 631 filled = 4; 632 } else if (count >= 2 && !(*ppos % 2)) { 633 u16 val; 634 635 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 636 *ppos, false); 637 if (ret <= 0) 638 goto read_err; 639 640 if (copy_to_user(buf, &val, sizeof(val))) 641 goto read_err; 642 643 filled = 2; 644 } else { 645 u8 val; 646 647 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 648 *ppos, false); 649 if (ret <= 0) 650 goto read_err; 651 652 if (copy_to_user(buf, &val, sizeof(val))) 653 goto read_err; 654 655 filled = 1; 656 } 657 658 count -= filled; 659 done += filled; 660 *ppos += filled; 661 buf += filled; 662 } 663 664 return done; 665 666read_err: 667 return -EFAULT; 668} 669 670static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf, 671 size_t count, loff_t *ppos) 672{ 673 struct mdev_state *mdev_state = 674 container_of(vdev, struct mdev_state, vdev); 675 unsigned int done = 0; 676 int ret; 677 678 while (count) { 679 size_t filled; 680 681 if (count >= 4 && !(*ppos % 4)) { 682 u32 val; 683 684 if (copy_from_user(&val, buf, sizeof(val))) 685 goto write_err; 686 687 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 688 *ppos, true); 689 if (ret <= 0) 690 goto write_err; 691 692 filled = 4; 693 } else if (count >= 2 && !(*ppos % 2)) { 694 u16 val; 695 696 if (copy_from_user(&val, buf, sizeof(val))) 697 goto write_err; 698 699 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 700 *ppos, true); 701 if (ret <= 0) 702 goto write_err; 703 704 filled = 2; 705 } else { 706 u8 val; 707 708 if (copy_from_user(&val, buf, sizeof(val))) 709 goto write_err; 710 711 ret = mdev_access(mdev_state, (char *)&val, sizeof(val), 712 *ppos, true); 713 if (ret <= 0) 714 goto write_err; 715 716 filled = 1; 717 } 718 count -= filled; 719 done += filled; 720 *ppos += filled; 721 buf += filled; 722 } 723 724 return done; 725write_err: 726 return -EFAULT; 727} 728 729static struct page *__mbochs_get_page(struct mdev_state *mdev_state, 730 pgoff_t pgoff) 731{ 732 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 733 734 if (!mdev_state->pages[pgoff]) { 735 mdev_state->pages[pgoff] = 736 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0); 737 if (!mdev_state->pages[pgoff]) 738 return NULL; 739 } 740 741 get_page(mdev_state->pages[pgoff]); 742 return mdev_state->pages[pgoff]; 743} 744 745static struct page *mbochs_get_page(struct mdev_state *mdev_state, 746 pgoff_t pgoff) 747{ 748 struct page *page; 749 750 if (WARN_ON(pgoff >= mdev_state->pagecount)) 751 return NULL; 752 753 mutex_lock(&mdev_state->ops_lock); 754 page = __mbochs_get_page(mdev_state, pgoff); 755 mutex_unlock(&mdev_state->ops_lock); 756 757 return page; 758} 759 760static void mbochs_put_pages(struct mdev_state *mdev_state) 761{ 762 struct device *dev = mdev_dev(mdev_state->mdev); 763 int i, count = 0; 764 765 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 766 767 for (i = 0; i < mdev_state->pagecount; i++) { 768 if (!mdev_state->pages[i]) 769 continue; 770 put_page(mdev_state->pages[i]); 771 mdev_state->pages[i] = NULL; 772 count++; 773 } 774 dev_dbg(dev, "%s: %d pages released\n", __func__, count); 775} 776 777static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf) 778{ 779 struct vm_area_struct *vma = vmf->vma; 780 struct mdev_state *mdev_state = vma->vm_private_data; 781 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 782 783 if (page_offset >= mdev_state->pagecount) 784 return VM_FAULT_SIGBUS; 785 786 vmf->page = mbochs_get_page(mdev_state, page_offset); 787 if (!vmf->page) 788 return VM_FAULT_SIGBUS; 789 790 return 0; 791} 792 793static const struct vm_operations_struct mbochs_region_vm_ops = { 794 .fault = mbochs_region_vm_fault, 795}; 796 797static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma) 798{ 799 struct mdev_state *mdev_state = 800 container_of(vdev, struct mdev_state, vdev); 801 802 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT) 803 return -EINVAL; 804 if (vma->vm_end < vma->vm_start) 805 return -EINVAL; 806 if (vma->vm_end - vma->vm_start > mdev_state->memsize) 807 return -EINVAL; 808 if ((vma->vm_flags & VM_SHARED) == 0) 809 return -EINVAL; 810 811 vma->vm_ops = &mbochs_region_vm_ops; 812 vma->vm_private_data = mdev_state; 813 return 0; 814} 815 816static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf) 817{ 818 struct vm_area_struct *vma = vmf->vma; 819 struct mbochs_dmabuf *dmabuf = vma->vm_private_data; 820 821 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount)) 822 return VM_FAULT_SIGBUS; 823 824 vmf->page = dmabuf->pages[vmf->pgoff]; 825 get_page(vmf->page); 826 return 0; 827} 828 829static const struct vm_operations_struct mbochs_dmabuf_vm_ops = { 830 .fault = mbochs_dmabuf_vm_fault, 831}; 832 833static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma) 834{ 835 struct mbochs_dmabuf *dmabuf = buf->priv; 836 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 837 838 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 839 840 if ((vma->vm_flags & VM_SHARED) == 0) 841 return -EINVAL; 842 843 vma->vm_ops = &mbochs_dmabuf_vm_ops; 844 vma->vm_private_data = dmabuf; 845 return 0; 846} 847 848static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf, 849 const char *prefix) 850{ 851 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 852 u32 fourcc = dmabuf->mode.drm_format; 853 854 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n", 855 prefix, dmabuf->id, 856 fourcc ? ((fourcc >> 0) & 0xff) : '-', 857 fourcc ? ((fourcc >> 8) & 0xff) : '-', 858 fourcc ? ((fourcc >> 16) & 0xff) : '-', 859 fourcc ? ((fourcc >> 24) & 0xff) : '-', 860 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride, 861 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount); 862} 863 864static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at, 865 enum dma_data_direction direction) 866{ 867 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 868 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 869 struct sg_table *sg; 870 871 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 872 873 sg = kzalloc(sizeof(*sg), GFP_KERNEL); 874 if (!sg) 875 goto err1; 876 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount, 877 0, dmabuf->mode.size, GFP_KERNEL) < 0) 878 goto err2; 879 if (dma_map_sgtable(at->dev, sg, direction, 0)) 880 goto err3; 881 882 return sg; 883 884err3: 885 sg_free_table(sg); 886err2: 887 kfree(sg); 888err1: 889 return ERR_PTR(-ENOMEM); 890} 891 892static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at, 893 struct sg_table *sg, 894 enum dma_data_direction direction) 895{ 896 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; 897 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); 898 899 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 900 901 dma_unmap_sgtable(at->dev, sg, direction, 0); 902 sg_free_table(sg); 903 kfree(sg); 904} 905 906static void mbochs_release_dmabuf(struct dma_buf *buf) 907{ 908 struct mbochs_dmabuf *dmabuf = buf->priv; 909 struct mdev_state *mdev_state = dmabuf->mdev_state; 910 struct device *dev = mdev_dev(mdev_state->mdev); 911 pgoff_t pg; 912 913 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 914 915 for (pg = 0; pg < dmabuf->pagecount; pg++) 916 put_page(dmabuf->pages[pg]); 917 918 mutex_lock(&mdev_state->ops_lock); 919 dmabuf->buf = NULL; 920 if (dmabuf->unlinked) 921 kfree(dmabuf); 922 mutex_unlock(&mdev_state->ops_lock); 923} 924 925static struct dma_buf_ops mbochs_dmabuf_ops = { 926 .map_dma_buf = mbochs_map_dmabuf, 927 .unmap_dma_buf = mbochs_unmap_dmabuf, 928 .release = mbochs_release_dmabuf, 929 .mmap = mbochs_mmap_dmabuf, 930}; 931 932static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state, 933 struct mbochs_mode *mode) 934{ 935 struct mbochs_dmabuf *dmabuf; 936 pgoff_t page_offset, pg; 937 938 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 939 940 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL); 941 if (!dmabuf) 942 return NULL; 943 944 dmabuf->mode = *mode; 945 dmabuf->id = mdev_state->next_id++; 946 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE); 947 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *), 948 GFP_KERNEL); 949 if (!dmabuf->pages) 950 goto err_free_dmabuf; 951 952 page_offset = dmabuf->mode.offset >> PAGE_SHIFT; 953 for (pg = 0; pg < dmabuf->pagecount; pg++) { 954 dmabuf->pages[pg] = __mbochs_get_page(mdev_state, 955 page_offset + pg); 956 if (!dmabuf->pages[pg]) 957 goto err_free_pages; 958 } 959 960 dmabuf->mdev_state = mdev_state; 961 list_add(&dmabuf->next, &mdev_state->dmabufs); 962 963 mbochs_print_dmabuf(dmabuf, __func__); 964 return dmabuf; 965 966err_free_pages: 967 while (pg > 0) 968 put_page(dmabuf->pages[--pg]); 969 kfree(dmabuf->pages); 970err_free_dmabuf: 971 kfree(dmabuf); 972 return NULL; 973} 974 975static struct mbochs_dmabuf * 976mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state, 977 struct mbochs_mode *mode) 978{ 979 struct mbochs_dmabuf *dmabuf; 980 981 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 982 983 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 984 if (mbochs_modes_equal(&dmabuf->mode, mode)) 985 return dmabuf; 986 987 return NULL; 988} 989 990static struct mbochs_dmabuf * 991mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id) 992{ 993 struct mbochs_dmabuf *dmabuf; 994 995 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 996 997 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) 998 if (dmabuf->id == id) 999 return dmabuf; 1000 1001 return NULL; 1002} 1003 1004static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf) 1005{ 1006 struct mdev_state *mdev_state = dmabuf->mdev_state; 1007 struct device *dev = mdev_state->vdev.dev; 1008 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 1009 struct dma_buf *buf; 1010 1011 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); 1012 1013 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) { 1014 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n", 1015 __func__); 1016 return -EINVAL; 1017 } 1018 1019 exp_info.ops = &mbochs_dmabuf_ops; 1020 exp_info.size = dmabuf->mode.size; 1021 exp_info.priv = dmabuf; 1022 1023 buf = dma_buf_export(&exp_info); 1024 if (IS_ERR(buf)) { 1025 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n", 1026 __func__, PTR_ERR(buf)); 1027 return PTR_ERR(buf); 1028 } 1029 1030 dmabuf->buf = buf; 1031 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); 1032 return 0; 1033} 1034 1035static int mbochs_get_region_info(struct mdev_state *mdev_state, 1036 struct vfio_region_info_ext *ext) 1037{ 1038 struct vfio_region_info *region_info = &ext->base; 1039 1040 if (region_info->index >= MBOCHS_NUM_REGIONS) 1041 return -EINVAL; 1042 1043 switch (region_info->index) { 1044 case VFIO_PCI_CONFIG_REGION_INDEX: 1045 region_info->offset = 0; 1046 region_info->size = MBOCHS_CONFIG_SPACE_SIZE; 1047 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1048 VFIO_REGION_INFO_FLAG_WRITE); 1049 break; 1050 case VFIO_PCI_BAR0_REGION_INDEX: 1051 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET; 1052 region_info->size = mdev_state->memsize; 1053 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1054 VFIO_REGION_INFO_FLAG_WRITE | 1055 VFIO_REGION_INFO_FLAG_MMAP); 1056 break; 1057 case VFIO_PCI_BAR2_REGION_INDEX: 1058 region_info->offset = MBOCHS_MMIO_BAR_OFFSET; 1059 region_info->size = MBOCHS_MMIO_BAR_SIZE; 1060 region_info->flags = (VFIO_REGION_INFO_FLAG_READ | 1061 VFIO_REGION_INFO_FLAG_WRITE); 1062 break; 1063 case MBOCHS_EDID_REGION_INDEX: 1064 ext->base.argsz = sizeof(*ext); 1065 ext->base.offset = MBOCHS_EDID_OFFSET; 1066 ext->base.size = MBOCHS_EDID_SIZE; 1067 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ | 1068 VFIO_REGION_INFO_FLAG_WRITE | 1069 VFIO_REGION_INFO_FLAG_CAPS); 1070 ext->base.cap_offset = offsetof(typeof(*ext), type); 1071 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE; 1072 ext->type.header.version = 1; 1073 ext->type.header.next = 0; 1074 ext->type.type = VFIO_REGION_TYPE_GFX; 1075 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID; 1076 break; 1077 default: 1078 region_info->size = 0; 1079 region_info->offset = 0; 1080 region_info->flags = 0; 1081 } 1082 1083 return 0; 1084} 1085 1086static int mbochs_get_irq_info(struct vfio_irq_info *irq_info) 1087{ 1088 irq_info->count = 0; 1089 return 0; 1090} 1091 1092static int mbochs_get_device_info(struct vfio_device_info *dev_info) 1093{ 1094 dev_info->flags = VFIO_DEVICE_FLAGS_PCI; 1095 dev_info->num_regions = MBOCHS_NUM_REGIONS; 1096 dev_info->num_irqs = VFIO_PCI_NUM_IRQS; 1097 return 0; 1098} 1099 1100static int mbochs_query_gfx_plane(struct mdev_state *mdev_state, 1101 struct vfio_device_gfx_plane_info *plane) 1102{ 1103 struct mbochs_dmabuf *dmabuf; 1104 struct mbochs_mode mode; 1105 int ret; 1106 1107 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) { 1108 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE | 1109 VFIO_GFX_PLANE_TYPE_DMABUF)) 1110 return 0; 1111 return -EINVAL; 1112 } 1113 1114 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF) 1115 return -EINVAL; 1116 1117 plane->drm_format_mod = 0; 1118 plane->x_pos = 0; 1119 plane->y_pos = 0; 1120 plane->x_hot = 0; 1121 plane->y_hot = 0; 1122 1123 mutex_lock(&mdev_state->ops_lock); 1124 1125 ret = -EINVAL; 1126 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY) 1127 ret = mbochs_check_framebuffer(mdev_state, &mode); 1128 if (ret < 0) { 1129 plane->drm_format = 0; 1130 plane->width = 0; 1131 plane->height = 0; 1132 plane->stride = 0; 1133 plane->size = 0; 1134 plane->dmabuf_id = 0; 1135 goto done; 1136 } 1137 1138 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode); 1139 if (!dmabuf) 1140 mbochs_dmabuf_alloc(mdev_state, &mode); 1141 if (!dmabuf) { 1142 mutex_unlock(&mdev_state->ops_lock); 1143 return -ENOMEM; 1144 } 1145 1146 plane->drm_format = dmabuf->mode.drm_format; 1147 plane->width = dmabuf->mode.width; 1148 plane->height = dmabuf->mode.height; 1149 plane->stride = dmabuf->mode.stride; 1150 plane->size = dmabuf->mode.size; 1151 plane->dmabuf_id = dmabuf->id; 1152 1153done: 1154 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY && 1155 mdev_state->active_id != plane->dmabuf_id) { 1156 dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n", 1157 __func__, mdev_state->active_id, plane->dmabuf_id); 1158 mdev_state->active_id = plane->dmabuf_id; 1159 } 1160 mutex_unlock(&mdev_state->ops_lock); 1161 return 0; 1162} 1163 1164static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id) 1165{ 1166 struct mbochs_dmabuf *dmabuf; 1167 1168 mutex_lock(&mdev_state->ops_lock); 1169 1170 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id); 1171 if (!dmabuf) { 1172 mutex_unlock(&mdev_state->ops_lock); 1173 return -ENOENT; 1174 } 1175 1176 if (!dmabuf->buf) 1177 mbochs_dmabuf_export(dmabuf); 1178 1179 mutex_unlock(&mdev_state->ops_lock); 1180 1181 if (!dmabuf->buf) 1182 return -EINVAL; 1183 1184 return dma_buf_fd(dmabuf->buf, 0); 1185} 1186 1187static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd, 1188 unsigned long arg) 1189{ 1190 struct mdev_state *mdev_state = 1191 container_of(vdev, struct mdev_state, vdev); 1192 int ret = 0; 1193 unsigned long minsz, outsz; 1194 1195 switch (cmd) { 1196 case VFIO_DEVICE_GET_INFO: 1197 { 1198 struct vfio_device_info info; 1199 1200 minsz = offsetofend(struct vfio_device_info, num_irqs); 1201 1202 if (copy_from_user(&info, (void __user *)arg, minsz)) 1203 return -EFAULT; 1204 1205 if (info.argsz < minsz) 1206 return -EINVAL; 1207 1208 ret = mbochs_get_device_info(&info); 1209 if (ret) 1210 return ret; 1211 1212 if (copy_to_user((void __user *)arg, &info, minsz)) 1213 return -EFAULT; 1214 1215 return 0; 1216 } 1217 case VFIO_DEVICE_GET_REGION_INFO: 1218 { 1219 struct vfio_region_info_ext info; 1220 1221 minsz = offsetofend(typeof(info), base.offset); 1222 1223 if (copy_from_user(&info, (void __user *)arg, minsz)) 1224 return -EFAULT; 1225 1226 outsz = info.base.argsz; 1227 if (outsz < minsz) 1228 return -EINVAL; 1229 if (outsz > sizeof(info)) 1230 return -EINVAL; 1231 1232 ret = mbochs_get_region_info(mdev_state, &info); 1233 if (ret) 1234 return ret; 1235 1236 if (copy_to_user((void __user *)arg, &info, outsz)) 1237 return -EFAULT; 1238 1239 return 0; 1240 } 1241 1242 case VFIO_DEVICE_GET_IRQ_INFO: 1243 { 1244 struct vfio_irq_info info; 1245 1246 minsz = offsetofend(struct vfio_irq_info, count); 1247 1248 if (copy_from_user(&info, (void __user *)arg, minsz)) 1249 return -EFAULT; 1250 1251 if ((info.argsz < minsz) || 1252 (info.index >= VFIO_PCI_NUM_IRQS)) 1253 return -EINVAL; 1254 1255 ret = mbochs_get_irq_info(&info); 1256 if (ret) 1257 return ret; 1258 1259 if (copy_to_user((void __user *)arg, &info, minsz)) 1260 return -EFAULT; 1261 1262 return 0; 1263 } 1264 1265 case VFIO_DEVICE_QUERY_GFX_PLANE: 1266 { 1267 struct vfio_device_gfx_plane_info plane = {}; 1268 1269 minsz = offsetofend(struct vfio_device_gfx_plane_info, 1270 region_index); 1271 1272 if (copy_from_user(&plane, (void __user *)arg, minsz)) 1273 return -EFAULT; 1274 1275 if (plane.argsz < minsz) 1276 return -EINVAL; 1277 1278 ret = mbochs_query_gfx_plane(mdev_state, &plane); 1279 if (ret) 1280 return ret; 1281 1282 if (copy_to_user((void __user *)arg, &plane, minsz)) 1283 return -EFAULT; 1284 1285 return 0; 1286 } 1287 1288 case VFIO_DEVICE_GET_GFX_DMABUF: 1289 { 1290 u32 dmabuf_id; 1291 1292 if (get_user(dmabuf_id, (__u32 __user *)arg)) 1293 return -EFAULT; 1294 1295 return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id); 1296 } 1297 1298 case VFIO_DEVICE_SET_IRQS: 1299 return -EINVAL; 1300 1301 case VFIO_DEVICE_RESET: 1302 return mbochs_reset(mdev_state); 1303 } 1304 return -ENOTTY; 1305} 1306 1307static void mbochs_close_device(struct vfio_device *vdev) 1308{ 1309 struct mdev_state *mdev_state = 1310 container_of(vdev, struct mdev_state, vdev); 1311 struct mbochs_dmabuf *dmabuf, *tmp; 1312 1313 mutex_lock(&mdev_state->ops_lock); 1314 1315 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) { 1316 list_del(&dmabuf->next); 1317 if (dmabuf->buf) { 1318 /* free in mbochs_release_dmabuf() */ 1319 dmabuf->unlinked = true; 1320 } else { 1321 kfree(dmabuf); 1322 } 1323 } 1324 mbochs_put_pages(mdev_state); 1325 1326 mutex_unlock(&mdev_state->ops_lock); 1327} 1328 1329static ssize_t 1330memory_show(struct device *dev, struct device_attribute *attr, 1331 char *buf) 1332{ 1333 struct mdev_state *mdev_state = dev_get_drvdata(dev); 1334 1335 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes); 1336} 1337static DEVICE_ATTR_RO(memory); 1338 1339static struct attribute *mdev_dev_attrs[] = { 1340 &dev_attr_memory.attr, 1341 NULL, 1342}; 1343 1344static const struct attribute_group mdev_dev_group = { 1345 .name = "vendor", 1346 .attrs = mdev_dev_attrs, 1347}; 1348 1349static const struct attribute_group *mdev_dev_groups[] = { 1350 &mdev_dev_group, 1351 NULL, 1352}; 1353 1354static ssize_t mbochs_show_description(struct mdev_type *mtype, char *buf) 1355{ 1356 struct mbochs_type *type = 1357 container_of(mtype, struct mbochs_type, type); 1358 1359 return sprintf(buf, "virtual display, %d MB video memory\n", 1360 type ? type->mbytes : 0); 1361} 1362 1363static unsigned int mbochs_get_available(struct mdev_type *mtype) 1364{ 1365 struct mbochs_type *type = 1366 container_of(mtype, struct mbochs_type, type); 1367 1368 return atomic_read(&mbochs_avail_mbytes) / type->mbytes; 1369} 1370 1371static const struct vfio_device_ops mbochs_dev_ops = { 1372 .close_device = mbochs_close_device, 1373 .init = mbochs_init_dev, 1374 .release = mbochs_release_dev, 1375 .read = mbochs_read, 1376 .write = mbochs_write, 1377 .ioctl = mbochs_ioctl, 1378 .mmap = mbochs_mmap, 1379 .bind_iommufd = vfio_iommufd_emulated_bind, 1380 .unbind_iommufd = vfio_iommufd_emulated_unbind, 1381 .attach_ioas = vfio_iommufd_emulated_attach_ioas, 1382 .detach_ioas = vfio_iommufd_emulated_detach_ioas, 1383}; 1384 1385static struct mdev_driver mbochs_driver = { 1386 .device_api = VFIO_DEVICE_API_PCI_STRING, 1387 .driver = { 1388 .name = "mbochs", 1389 .owner = THIS_MODULE, 1390 .mod_name = KBUILD_MODNAME, 1391 .dev_groups = mdev_dev_groups, 1392 }, 1393 .probe = mbochs_probe, 1394 .remove = mbochs_remove, 1395 .get_available = mbochs_get_available, 1396 .show_description = mbochs_show_description, 1397}; 1398 1399static const struct file_operations vd_fops = { 1400 .owner = THIS_MODULE, 1401}; 1402 1403static void mbochs_device_release(struct device *dev) 1404{ 1405 /* nothing */ 1406} 1407 1408static int __init mbochs_dev_init(void) 1409{ 1410 int ret = 0; 1411 1412 atomic_set(&mbochs_avail_mbytes, max_mbytes); 1413 1414 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME); 1415 if (ret < 0) { 1416 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret); 1417 return ret; 1418 } 1419 cdev_init(&mbochs_cdev, &vd_fops); 1420 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1); 1421 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt)); 1422 1423 ret = mdev_register_driver(&mbochs_driver); 1424 if (ret) 1425 goto err_cdev; 1426 1427 ret = class_register(&mbochs_class); 1428 if (ret) 1429 goto err_driver; 1430 mbochs_dev.class = &mbochs_class; 1431 mbochs_dev.release = mbochs_device_release; 1432 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME); 1433 1434 ret = device_register(&mbochs_dev); 1435 if (ret) 1436 goto err_put; 1437 1438 ret = mdev_register_parent(&mbochs_parent, &mbochs_dev, &mbochs_driver, 1439 mbochs_mdev_types, 1440 ARRAY_SIZE(mbochs_mdev_types)); 1441 if (ret) 1442 goto err_device; 1443 1444 return 0; 1445 1446err_device: 1447 device_del(&mbochs_dev); 1448err_put: 1449 put_device(&mbochs_dev); 1450 class_unregister(&mbochs_class); 1451err_driver: 1452 mdev_unregister_driver(&mbochs_driver); 1453err_cdev: 1454 cdev_del(&mbochs_cdev); 1455 unregister_chrdev_region(mbochs_devt, MINORMASK + 1); 1456 return ret; 1457} 1458 1459static void __exit mbochs_dev_exit(void) 1460{ 1461 mbochs_dev.bus = NULL; 1462 mdev_unregister_parent(&mbochs_parent); 1463 1464 device_unregister(&mbochs_dev); 1465 mdev_unregister_driver(&mbochs_driver); 1466 cdev_del(&mbochs_cdev); 1467 unregister_chrdev_region(mbochs_devt, MINORMASK + 1); 1468 class_unregister(&mbochs_class); 1469} 1470 1471MODULE_IMPORT_NS(DMA_BUF); 1472module_init(mbochs_dev_init) 1473module_exit(mbochs_dev_exit) 1474