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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_CONFIG_SPACE_SIZE 0xff
75#define MBOCHS_MMIO_BAR_OFFSET PAGE_SIZE
76#define MBOCHS_MMIO_BAR_SIZE PAGE_SIZE
77#define MBOCHS_MEMORY_BAR_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \
78 MBOCHS_MMIO_BAR_SIZE)
79
80#define STORE_LE16(addr, val) (*(u16 *)addr = val)
81#define STORE_LE32(addr, val) (*(u32 *)addr = val)
82
83
84MODULE_LICENSE("GPL v2");
85
86static int max_mbytes = 256;
87module_param_named(count, max_mbytes, int, 0444);
88MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices");
89
90
91#define MBOCHS_TYPE_1 "small"
92#define MBOCHS_TYPE_2 "medium"
93#define MBOCHS_TYPE_3 "large"
94
95static const struct mbochs_type {
96 const char *name;
97 u32 mbytes;
98} mbochs_types[] = {
99 {
100 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1,
101 .mbytes = 4,
102 }, {
103 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2,
104 .mbytes = 16,
105 }, {
106 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3,
107 .mbytes = 64,
108 },
109};
110
111
112static dev_t mbochs_devt;
113static struct class *mbochs_class;
114static struct cdev mbochs_cdev;
115static struct device mbochs_dev;
116static int mbochs_used_mbytes;
117
118struct mbochs_mode {
119 u32 drm_format;
120 u32 bytepp;
121 u32 width;
122 u32 height;
123 u32 stride;
124 u32 __pad;
125 u64 offset;
126 u64 size;
127};
128
129struct mbochs_dmabuf {
130 struct mbochs_mode mode;
131 u32 id;
132 struct page **pages;
133 pgoff_t pagecount;
134 struct dma_buf *buf;
135 struct mdev_state *mdev_state;
136 struct list_head next;
137 bool unlinked;
138};
139
140
141struct mdev_state {
142 u8 *vconfig;
143 u64 bar_mask[3];
144 u32 memory_bar_mask;
145 struct mutex ops_lock;
146 struct mdev_device *mdev;
147 struct vfio_device_info dev_info;
148
149 const struct mbochs_type *type;
150 u16 vbe[VBE_DISPI_INDEX_COUNT];
151 u64 memsize;
152 struct page **pages;
153 pgoff_t pagecount;
154
155 struct list_head dmabufs;
156 u32 active_id;
157 u32 next_id;
158};
159
160static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = {
161 [VBE_DISPI_INDEX_ID] = "id",
162 [VBE_DISPI_INDEX_XRES] = "xres",
163 [VBE_DISPI_INDEX_YRES] = "yres",
164 [VBE_DISPI_INDEX_BPP] = "bpp",
165 [VBE_DISPI_INDEX_ENABLE] = "enable",
166 [VBE_DISPI_INDEX_BANK] = "bank",
167 [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width",
168 [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height",
169 [VBE_DISPI_INDEX_X_OFFSET] = "x-offset",
170 [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset",
171 [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem",
172};
173
174static const char *vbe_name(u32 index)
175{
176 if (index < ARRAY_SIZE(vbe_name_list))
177 return vbe_name_list[index];
178 return "(invalid)";
179}
180
181static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
182 pgoff_t pgoff);
183static struct page *mbochs_get_page(struct mdev_state *mdev_state,
184 pgoff_t pgoff);
185
186static const struct mbochs_type *mbochs_find_type(struct kobject *kobj)
187{
188 int i;
189
190 for (i = 0; i < ARRAY_SIZE(mbochs_types); i++)
191 if (strcmp(mbochs_types[i].name, kobj->name) == 0)
192 return mbochs_types + i;
193 return NULL;
194}
195
196static void mbochs_create_config_space(struct mdev_state *mdev_state)
197{
198 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID],
199 0x1234);
200 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID],
201 0x1111);
202 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID],
203 PCI_SUBVENDOR_ID_REDHAT_QUMRANET);
204 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID],
205 PCI_SUBDEVICE_ID_QEMU);
206
207 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND],
208 PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
209 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE],
210 PCI_CLASS_DISPLAY_OTHER);
211 mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01;
212
213 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0],
214 PCI_BASE_ADDRESS_SPACE_MEMORY |
215 PCI_BASE_ADDRESS_MEM_TYPE_32 |
216 PCI_BASE_ADDRESS_MEM_PREFETCH);
217 mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1;
218
219 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2],
220 PCI_BASE_ADDRESS_SPACE_MEMORY |
221 PCI_BASE_ADDRESS_MEM_TYPE_32);
222 mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1;
223}
224
225static int mbochs_check_framebuffer(struct mdev_state *mdev_state,
226 struct mbochs_mode *mode)
227{
228 struct device *dev = mdev_dev(mdev_state->mdev);
229 u16 *vbe = mdev_state->vbe;
230 u32 virt_width;
231
232 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
233
234 if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED))
235 goto nofb;
236
237 memset(mode, 0, sizeof(*mode));
238 switch (vbe[VBE_DISPI_INDEX_BPP]) {
239 case 32:
240 mode->drm_format = DRM_FORMAT_XRGB8888;
241 mode->bytepp = 4;
242 break;
243 default:
244 dev_info_ratelimited(dev, "%s: bpp %d not supported\n",
245 __func__, vbe[VBE_DISPI_INDEX_BPP]);
246 goto nofb;
247 }
248
249 mode->width = vbe[VBE_DISPI_INDEX_XRES];
250 mode->height = vbe[VBE_DISPI_INDEX_YRES];
251 virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH];
252 if (virt_width < mode->width)
253 virt_width = mode->width;
254 mode->stride = virt_width * mode->bytepp;
255 mode->size = (u64)mode->stride * mode->height;
256 mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp +
257 (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride);
258
259 if (mode->width < 64 || mode->height < 64) {
260 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n",
261 __func__, mode->width, mode->height);
262 goto nofb;
263 }
264 if (mode->offset + mode->size > mdev_state->memsize) {
265 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n",
266 __func__);
267 goto nofb;
268 }
269
270 return 0;
271
272nofb:
273 memset(mode, 0, sizeof(*mode));
274 return -EINVAL;
275}
276
277static bool mbochs_modes_equal(struct mbochs_mode *mode1,
278 struct mbochs_mode *mode2)
279{
280 return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0;
281}
282
283static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
284 char *buf, u32 count)
285{
286 struct device *dev = mdev_dev(mdev_state->mdev);
287 int index = (offset - PCI_BASE_ADDRESS_0) / 0x04;
288 u32 cfg_addr;
289
290 switch (offset) {
291 case PCI_BASE_ADDRESS_0:
292 case PCI_BASE_ADDRESS_2:
293 cfg_addr = *(u32 *)buf;
294
295 if (cfg_addr == 0xffffffff) {
296 cfg_addr = (cfg_addr & mdev_state->bar_mask[index]);
297 } else {
298 cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK;
299 if (cfg_addr)
300 dev_info(dev, "BAR #%d @ 0x%x\n",
301 index, cfg_addr);
302 }
303
304 cfg_addr |= (mdev_state->vconfig[offset] &
305 ~PCI_BASE_ADDRESS_MEM_MASK);
306 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr);
307 break;
308 }
309}
310
311static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset,
312 char *buf, u32 count)
313{
314 struct device *dev = mdev_dev(mdev_state->mdev);
315 int index;
316 u16 reg16;
317
318 switch (offset) {
319 case 0x400 ... 0x41f:
320 goto unhandled;
321 case 0x500 ... 0x515:
322 if (count != 2)
323 goto unhandled;
324 index = (offset - 0x500) / 2;
325 reg16 = *(u16 *)buf;
326 if (index < ARRAY_SIZE(mdev_state->vbe))
327 mdev_state->vbe[index] = reg16;
328 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n",
329 __func__, index, reg16, vbe_name(index));
330 break;
331 case 0x600 ... 0x607:
332 goto unhandled;
333 default:
334unhandled:
335 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
336 __func__, offset, count);
337 break;
338 }
339}
340
341static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset,
342 char *buf, u32 count)
343{
344 struct device *dev = mdev_dev(mdev_state->mdev);
345 u16 reg16 = 0;
346 int index;
347
348 switch (offset) {
349 case 0x500 ... 0x515:
350 if (count != 2)
351 goto unhandled;
352 index = (offset - 0x500) / 2;
353 if (index < ARRAY_SIZE(mdev_state->vbe))
354 reg16 = mdev_state->vbe[index];
355 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n",
356 __func__, index, reg16, vbe_name(index));
357 *(u16 *)buf = reg16;
358 break;
359 default:
360unhandled:
361 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
362 __func__, offset, count);
363 memset(buf, 0, count);
364 break;
365 }
366}
367
368static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
369 loff_t pos, bool is_write)
370{
371 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
372 struct device *dev = mdev_dev(mdev);
373 struct page *pg;
374 loff_t poff;
375 char *map;
376 int ret = 0;
377
378 mutex_lock(&mdev_state->ops_lock);
379
380 if (pos < MBOCHS_CONFIG_SPACE_SIZE) {
381 if (is_write)
382 handle_pci_cfg_write(mdev_state, pos, buf, count);
383 else
384 memcpy(buf, (mdev_state->vconfig + pos), count);
385
386 } else if (pos >= MBOCHS_MMIO_BAR_OFFSET &&
387 pos + count <= MBOCHS_MEMORY_BAR_OFFSET) {
388 pos -= MBOCHS_MMIO_BAR_OFFSET;
389 if (is_write)
390 handle_mmio_write(mdev_state, pos, buf, count);
391 else
392 handle_mmio_read(mdev_state, pos, buf, count);
393
394 } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET &&
395 pos + count <=
396 MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) {
397 pos -= MBOCHS_MMIO_BAR_OFFSET;
398 poff = pos & ~PAGE_MASK;
399 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT);
400 map = kmap(pg);
401 if (is_write)
402 memcpy(map + poff, buf, count);
403 else
404 memcpy(buf, map + poff, count);
405 kunmap(pg);
406 put_page(pg);
407
408 } else {
409 dev_dbg(dev, "%s: %s @0x%llx (unhandled)\n",
410 __func__, is_write ? "WR" : "RD", pos);
411 ret = -1;
412 goto accessfailed;
413 }
414
415 ret = count;
416
417
418accessfailed:
419 mutex_unlock(&mdev_state->ops_lock);
420
421 return ret;
422}
423
424static int mbochs_reset(struct mdev_device *mdev)
425{
426 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
427 u32 size64k = mdev_state->memsize / (64 * 1024);
428 int i;
429
430 for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++)
431 mdev_state->vbe[i] = 0;
432 mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5;
433 mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k;
434 return 0;
435}
436
437static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
438{
439 const struct mbochs_type *type = mbochs_find_type(kobj);
440 struct device *dev = mdev_dev(mdev);
441 struct mdev_state *mdev_state;
442
443 if (!type)
444 type = &mbochs_types[0];
445 if (type->mbytes + mbochs_used_mbytes > max_mbytes)
446 return -ENOMEM;
447
448 mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
449 if (mdev_state == NULL)
450 return -ENOMEM;
451
452 mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
453 if (mdev_state->vconfig == NULL)
454 goto err_mem;
455
456 mdev_state->memsize = type->mbytes * 1024 * 1024;
457 mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT;
458 mdev_state->pages = kcalloc(mdev_state->pagecount,
459 sizeof(struct page *),
460 GFP_KERNEL);
461 if (!mdev_state->pages)
462 goto err_mem;
463
464 dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__,
465 kobj->name, type->mbytes, mdev_state->pagecount);
466
467 mutex_init(&mdev_state->ops_lock);
468 mdev_state->mdev = mdev;
469 mdev_set_drvdata(mdev, mdev_state);
470 INIT_LIST_HEAD(&mdev_state->dmabufs);
471 mdev_state->next_id = 1;
472
473 mdev_state->type = type;
474 mbochs_create_config_space(mdev_state);
475 mbochs_reset(mdev);
476
477 mbochs_used_mbytes += type->mbytes;
478 return 0;
479
480err_mem:
481 kfree(mdev_state->vconfig);
482 kfree(mdev_state);
483 return -ENOMEM;
484}
485
486static int mbochs_remove(struct mdev_device *mdev)
487{
488 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
489
490 mbochs_used_mbytes -= mdev_state->type->mbytes;
491 mdev_set_drvdata(mdev, NULL);
492 kfree(mdev_state->pages);
493 kfree(mdev_state->vconfig);
494 kfree(mdev_state);
495 return 0;
496}
497
498static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
499 size_t count, loff_t *ppos)
500{
501 unsigned int done = 0;
502 int ret;
503
504 while (count) {
505 size_t filled;
506
507 if (count >= 4 && !(*ppos % 4)) {
508 u32 val;
509
510 ret = mdev_access(mdev, (char *)&val, sizeof(val),
511 *ppos, false);
512 if (ret <= 0)
513 goto read_err;
514
515 if (copy_to_user(buf, &val, sizeof(val)))
516 goto read_err;
517
518 filled = 4;
519 } else if (count >= 2 && !(*ppos % 2)) {
520 u16 val;
521
522 ret = mdev_access(mdev, (char *)&val, sizeof(val),
523 *ppos, false);
524 if (ret <= 0)
525 goto read_err;
526
527 if (copy_to_user(buf, &val, sizeof(val)))
528 goto read_err;
529
530 filled = 2;
531 } else {
532 u8 val;
533
534 ret = mdev_access(mdev, (char *)&val, sizeof(val),
535 *ppos, false);
536 if (ret <= 0)
537 goto read_err;
538
539 if (copy_to_user(buf, &val, sizeof(val)))
540 goto read_err;
541
542 filled = 1;
543 }
544
545 count -= filled;
546 done += filled;
547 *ppos += filled;
548 buf += filled;
549 }
550
551 return done;
552
553read_err:
554 return -EFAULT;
555}
556
557static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
558 size_t count, loff_t *ppos)
559{
560 unsigned int done = 0;
561 int ret;
562
563 while (count) {
564 size_t filled;
565
566 if (count >= 4 && !(*ppos % 4)) {
567 u32 val;
568
569 if (copy_from_user(&val, buf, sizeof(val)))
570 goto write_err;
571
572 ret = mdev_access(mdev, (char *)&val, sizeof(val),
573 *ppos, true);
574 if (ret <= 0)
575 goto write_err;
576
577 filled = 4;
578 } else if (count >= 2 && !(*ppos % 2)) {
579 u16 val;
580
581 if (copy_from_user(&val, buf, sizeof(val)))
582 goto write_err;
583
584 ret = mdev_access(mdev, (char *)&val, sizeof(val),
585 *ppos, true);
586 if (ret <= 0)
587 goto write_err;
588
589 filled = 2;
590 } else {
591 u8 val;
592
593 if (copy_from_user(&val, buf, sizeof(val)))
594 goto write_err;
595
596 ret = mdev_access(mdev, (char *)&val, sizeof(val),
597 *ppos, true);
598 if (ret <= 0)
599 goto write_err;
600
601 filled = 1;
602 }
603 count -= filled;
604 done += filled;
605 *ppos += filled;
606 buf += filled;
607 }
608
609 return done;
610write_err:
611 return -EFAULT;
612}
613
614static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
615 pgoff_t pgoff)
616{
617 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
618
619 if (!mdev_state->pages[pgoff]) {
620 mdev_state->pages[pgoff] =
621 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0);
622 if (!mdev_state->pages[pgoff])
623 return NULL;
624 }
625
626 get_page(mdev_state->pages[pgoff]);
627 return mdev_state->pages[pgoff];
628}
629
630static struct page *mbochs_get_page(struct mdev_state *mdev_state,
631 pgoff_t pgoff)
632{
633 struct page *page;
634
635 if (WARN_ON(pgoff >= mdev_state->pagecount))
636 return NULL;
637
638 mutex_lock(&mdev_state->ops_lock);
639 page = __mbochs_get_page(mdev_state, pgoff);
640 mutex_unlock(&mdev_state->ops_lock);
641
642 return page;
643}
644
645static void mbochs_put_pages(struct mdev_state *mdev_state)
646{
647 struct device *dev = mdev_dev(mdev_state->mdev);
648 int i, count = 0;
649
650 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
651
652 for (i = 0; i < mdev_state->pagecount; i++) {
653 if (!mdev_state->pages[i])
654 continue;
655 put_page(mdev_state->pages[i]);
656 mdev_state->pages[i] = NULL;
657 count++;
658 }
659 dev_dbg(dev, "%s: %d pages released\n", __func__, count);
660}
661
662static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf)
663{
664 struct vm_area_struct *vma = vmf->vma;
665 struct mdev_state *mdev_state = vma->vm_private_data;
666 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
667
668 if (page_offset >= mdev_state->pagecount)
669 return VM_FAULT_SIGBUS;
670
671 vmf->page = mbochs_get_page(mdev_state, page_offset);
672 if (!vmf->page)
673 return VM_FAULT_SIGBUS;
674
675 return 0;
676}
677
678static const struct vm_operations_struct mbochs_region_vm_ops = {
679 .fault = mbochs_region_vm_fault,
680};
681
682static int mbochs_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
683{
684 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
685
686 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
687 return -EINVAL;
688 if (vma->vm_end < vma->vm_start)
689 return -EINVAL;
690 if (vma->vm_end - vma->vm_start > mdev_state->memsize)
691 return -EINVAL;
692 if ((vma->vm_flags & VM_SHARED) == 0)
693 return -EINVAL;
694
695 vma->vm_ops = &mbochs_region_vm_ops;
696 vma->vm_private_data = mdev_state;
697 return 0;
698}
699
700static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf)
701{
702 struct vm_area_struct *vma = vmf->vma;
703 struct mbochs_dmabuf *dmabuf = vma->vm_private_data;
704
705 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount))
706 return VM_FAULT_SIGBUS;
707
708 vmf->page = dmabuf->pages[vmf->pgoff];
709 get_page(vmf->page);
710 return 0;
711}
712
713static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
714 .fault = mbochs_dmabuf_vm_fault,
715};
716
717static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
718{
719 struct mbochs_dmabuf *dmabuf = buf->priv;
720 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
721
722 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
723
724 if ((vma->vm_flags & VM_SHARED) == 0)
725 return -EINVAL;
726
727 vma->vm_ops = &mbochs_dmabuf_vm_ops;
728 vma->vm_private_data = dmabuf;
729 return 0;
730}
731
732static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf,
733 const char *prefix)
734{
735 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
736 u32 fourcc = dmabuf->mode.drm_format;
737
738 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n",
739 prefix, dmabuf->id,
740 fourcc ? ((fourcc >> 0) & 0xff) : '-',
741 fourcc ? ((fourcc >> 8) & 0xff) : '-',
742 fourcc ? ((fourcc >> 16) & 0xff) : '-',
743 fourcc ? ((fourcc >> 24) & 0xff) : '-',
744 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride,
745 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount);
746}
747
748static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at,
749 enum dma_data_direction direction)
750{
751 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
752 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
753 struct sg_table *sg;
754
755 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
756
757 sg = kzalloc(sizeof(*sg), GFP_KERNEL);
758 if (!sg)
759 goto err1;
760 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount,
761 0, dmabuf->mode.size, GFP_KERNEL) < 0)
762 goto err2;
763 if (!dma_map_sg(at->dev, sg->sgl, sg->nents, direction))
764 goto err3;
765
766 return sg;
767
768err3:
769 sg_free_table(sg);
770err2:
771 kfree(sg);
772err1:
773 return ERR_PTR(-ENOMEM);
774}
775
776static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at,
777 struct sg_table *sg,
778 enum dma_data_direction direction)
779{
780 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
781 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
782
783 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
784
785 sg_free_table(sg);
786 kfree(sg);
787}
788
789static void mbochs_release_dmabuf(struct dma_buf *buf)
790{
791 struct mbochs_dmabuf *dmabuf = buf->priv;
792 struct mdev_state *mdev_state = dmabuf->mdev_state;
793 struct device *dev = mdev_dev(mdev_state->mdev);
794 pgoff_t pg;
795
796 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
797
798 for (pg = 0; pg < dmabuf->pagecount; pg++)
799 put_page(dmabuf->pages[pg]);
800
801 mutex_lock(&mdev_state->ops_lock);
802 dmabuf->buf = NULL;
803 if (dmabuf->unlinked)
804 kfree(dmabuf);
805 mutex_unlock(&mdev_state->ops_lock);
806}
807
808static struct dma_buf_ops mbochs_dmabuf_ops = {
809 .map_dma_buf = mbochs_map_dmabuf,
810 .unmap_dma_buf = mbochs_unmap_dmabuf,
811 .release = mbochs_release_dmabuf,
812 .mmap = mbochs_mmap_dmabuf,
813};
814
815static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state,
816 struct mbochs_mode *mode)
817{
818 struct mbochs_dmabuf *dmabuf;
819 pgoff_t page_offset, pg;
820
821 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
822
823 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL);
824 if (!dmabuf)
825 return NULL;
826
827 dmabuf->mode = *mode;
828 dmabuf->id = mdev_state->next_id++;
829 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE);
830 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *),
831 GFP_KERNEL);
832 if (!dmabuf->pages)
833 goto err_free_dmabuf;
834
835 page_offset = dmabuf->mode.offset >> PAGE_SHIFT;
836 for (pg = 0; pg < dmabuf->pagecount; pg++) {
837 dmabuf->pages[pg] = __mbochs_get_page(mdev_state,
838 page_offset + pg);
839 if (!dmabuf->pages[pg])
840 goto err_free_pages;
841 }
842
843 dmabuf->mdev_state = mdev_state;
844 list_add(&dmabuf->next, &mdev_state->dmabufs);
845
846 mbochs_print_dmabuf(dmabuf, __func__);
847 return dmabuf;
848
849err_free_pages:
850 while (pg > 0)
851 put_page(dmabuf->pages[--pg]);
852 kfree(dmabuf->pages);
853err_free_dmabuf:
854 kfree(dmabuf);
855 return NULL;
856}
857
858static struct mbochs_dmabuf *
859mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state,
860 struct mbochs_mode *mode)
861{
862 struct mbochs_dmabuf *dmabuf;
863
864 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
865
866 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
867 if (mbochs_modes_equal(&dmabuf->mode, mode))
868 return dmabuf;
869
870 return NULL;
871}
872
873static struct mbochs_dmabuf *
874mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
875{
876 struct mbochs_dmabuf *dmabuf;
877
878 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
879
880 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
881 if (dmabuf->id == id)
882 return dmabuf;
883
884 return NULL;
885}
886
887static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
888{
889 struct mdev_state *mdev_state = dmabuf->mdev_state;
890 struct device *dev = mdev_dev(mdev_state->mdev);
891 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
892 struct dma_buf *buf;
893
894 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
895
896 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) {
897 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n",
898 __func__);
899 return -EINVAL;
900 }
901
902 exp_info.ops = &mbochs_dmabuf_ops;
903 exp_info.size = dmabuf->mode.size;
904 exp_info.priv = dmabuf;
905
906 buf = dma_buf_export(&exp_info);
907 if (IS_ERR(buf)) {
908 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n",
909 __func__, PTR_ERR(buf));
910 return PTR_ERR(buf);
911 }
912
913 dmabuf->buf = buf;
914 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
915 return 0;
916}
917
918static int mbochs_get_region_info(struct mdev_device *mdev,
919 struct vfio_region_info *region_info,
920 u16 *cap_type_id, void **cap_type)
921{
922 struct mdev_state *mdev_state;
923
924 mdev_state = mdev_get_drvdata(mdev);
925 if (!mdev_state)
926 return -EINVAL;
927
928 if (region_info->index >= VFIO_PCI_NUM_REGIONS)
929 return -EINVAL;
930
931 switch (region_info->index) {
932 case VFIO_PCI_CONFIG_REGION_INDEX:
933 region_info->offset = 0;
934 region_info->size = MBOCHS_CONFIG_SPACE_SIZE;
935 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
936 VFIO_REGION_INFO_FLAG_WRITE);
937 break;
938 case VFIO_PCI_BAR0_REGION_INDEX:
939 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET;
940 region_info->size = mdev_state->memsize;
941 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
942 VFIO_REGION_INFO_FLAG_WRITE |
943 VFIO_REGION_INFO_FLAG_MMAP);
944 break;
945 case VFIO_PCI_BAR2_REGION_INDEX:
946 region_info->offset = MBOCHS_MMIO_BAR_OFFSET;
947 region_info->size = MBOCHS_MMIO_BAR_SIZE;
948 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
949 VFIO_REGION_INFO_FLAG_WRITE);
950 break;
951 default:
952 region_info->size = 0;
953 region_info->offset = 0;
954 region_info->flags = 0;
955 }
956
957 return 0;
958}
959
960static int mbochs_get_irq_info(struct mdev_device *mdev,
961 struct vfio_irq_info *irq_info)
962{
963 irq_info->count = 0;
964 return 0;
965}
966
967static int mbochs_get_device_info(struct mdev_device *mdev,
968 struct vfio_device_info *dev_info)
969{
970 dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
971 dev_info->num_regions = VFIO_PCI_NUM_REGIONS;
972 dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
973 return 0;
974}
975
976static int mbochs_query_gfx_plane(struct mdev_device *mdev,
977 struct vfio_device_gfx_plane_info *plane)
978{
979 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
980 struct device *dev = mdev_dev(mdev);
981 struct mbochs_dmabuf *dmabuf;
982 struct mbochs_mode mode;
983 int ret;
984
985 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
986 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
987 VFIO_GFX_PLANE_TYPE_DMABUF))
988 return 0;
989 return -EINVAL;
990 }
991
992 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF)
993 return -EINVAL;
994
995 plane->drm_format_mod = 0;
996 plane->x_pos = 0;
997 plane->y_pos = 0;
998 plane->x_hot = 0;
999 plane->y_hot = 0;
1000
1001 mutex_lock(&mdev_state->ops_lock);
1002
1003 ret = -EINVAL;
1004 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY)
1005 ret = mbochs_check_framebuffer(mdev_state, &mode);
1006 if (ret < 0) {
1007 plane->drm_format = 0;
1008 plane->width = 0;
1009 plane->height = 0;
1010 plane->stride = 0;
1011 plane->size = 0;
1012 plane->dmabuf_id = 0;
1013 goto done;
1014 }
1015
1016 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode);
1017 if (!dmabuf)
1018 mbochs_dmabuf_alloc(mdev_state, &mode);
1019 if (!dmabuf) {
1020 mutex_unlock(&mdev_state->ops_lock);
1021 return -ENOMEM;
1022 }
1023
1024 plane->drm_format = dmabuf->mode.drm_format;
1025 plane->width = dmabuf->mode.width;
1026 plane->height = dmabuf->mode.height;
1027 plane->stride = dmabuf->mode.stride;
1028 plane->size = dmabuf->mode.size;
1029 plane->dmabuf_id = dmabuf->id;
1030
1031done:
1032 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY &&
1033 mdev_state->active_id != plane->dmabuf_id) {
1034 dev_dbg(dev, "%s: primary: %d => %d\n", __func__,
1035 mdev_state->active_id, plane->dmabuf_id);
1036 mdev_state->active_id = plane->dmabuf_id;
1037 }
1038 mutex_unlock(&mdev_state->ops_lock);
1039 return 0;
1040}
1041
1042static int mbochs_get_gfx_dmabuf(struct mdev_device *mdev,
1043 u32 id)
1044{
1045 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1046 struct mbochs_dmabuf *dmabuf;
1047
1048 mutex_lock(&mdev_state->ops_lock);
1049
1050 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id);
1051 if (!dmabuf) {
1052 mutex_unlock(&mdev_state->ops_lock);
1053 return -ENOENT;
1054 }
1055
1056 if (!dmabuf->buf)
1057 mbochs_dmabuf_export(dmabuf);
1058
1059 mutex_unlock(&mdev_state->ops_lock);
1060
1061 if (!dmabuf->buf)
1062 return -EINVAL;
1063
1064 return dma_buf_fd(dmabuf->buf, 0);
1065}
1066
1067static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
1068 unsigned long arg)
1069{
1070 int ret = 0;
1071 unsigned long minsz;
1072 struct mdev_state *mdev_state;
1073
1074 mdev_state = mdev_get_drvdata(mdev);
1075
1076 switch (cmd) {
1077 case VFIO_DEVICE_GET_INFO:
1078 {
1079 struct vfio_device_info info;
1080
1081 minsz = offsetofend(struct vfio_device_info, num_irqs);
1082
1083 if (copy_from_user(&info, (void __user *)arg, minsz))
1084 return -EFAULT;
1085
1086 if (info.argsz < minsz)
1087 return -EINVAL;
1088
1089 ret = mbochs_get_device_info(mdev, &info);
1090 if (ret)
1091 return ret;
1092
1093 memcpy(&mdev_state->dev_info, &info, sizeof(info));
1094
1095 if (copy_to_user((void __user *)arg, &info, minsz))
1096 return -EFAULT;
1097
1098 return 0;
1099 }
1100 case VFIO_DEVICE_GET_REGION_INFO:
1101 {
1102 struct vfio_region_info info;
1103 u16 cap_type_id = 0;
1104 void *cap_type = NULL;
1105
1106 minsz = offsetofend(struct vfio_region_info, offset);
1107
1108 if (copy_from_user(&info, (void __user *)arg, minsz))
1109 return -EFAULT;
1110
1111 if (info.argsz < minsz)
1112 return -EINVAL;
1113
1114 ret = mbochs_get_region_info(mdev, &info, &cap_type_id,
1115 &cap_type);
1116 if (ret)
1117 return ret;
1118
1119 if (copy_to_user((void __user *)arg, &info, minsz))
1120 return -EFAULT;
1121
1122 return 0;
1123 }
1124
1125 case VFIO_DEVICE_GET_IRQ_INFO:
1126 {
1127 struct vfio_irq_info info;
1128
1129 minsz = offsetofend(struct vfio_irq_info, count);
1130
1131 if (copy_from_user(&info, (void __user *)arg, minsz))
1132 return -EFAULT;
1133
1134 if ((info.argsz < minsz) ||
1135 (info.index >= mdev_state->dev_info.num_irqs))
1136 return -EINVAL;
1137
1138 ret = mbochs_get_irq_info(mdev, &info);
1139 if (ret)
1140 return ret;
1141
1142 if (copy_to_user((void __user *)arg, &info, minsz))
1143 return -EFAULT;
1144
1145 return 0;
1146 }
1147
1148 case VFIO_DEVICE_QUERY_GFX_PLANE:
1149 {
1150 struct vfio_device_gfx_plane_info plane;
1151
1152 minsz = offsetofend(struct vfio_device_gfx_plane_info,
1153 region_index);
1154
1155 if (copy_from_user(&plane, (void __user *)arg, minsz))
1156 return -EFAULT;
1157
1158 if (plane.argsz < minsz)
1159 return -EINVAL;
1160
1161 ret = mbochs_query_gfx_plane(mdev, &plane);
1162 if (ret)
1163 return ret;
1164
1165 if (copy_to_user((void __user *)arg, &plane, minsz))
1166 return -EFAULT;
1167
1168 return 0;
1169 }
1170
1171 case VFIO_DEVICE_GET_GFX_DMABUF:
1172 {
1173 u32 dmabuf_id;
1174
1175 if (get_user(dmabuf_id, (__u32 __user *)arg))
1176 return -EFAULT;
1177
1178 return mbochs_get_gfx_dmabuf(mdev, dmabuf_id);
1179 }
1180
1181 case VFIO_DEVICE_SET_IRQS:
1182 return -EINVAL;
1183
1184 case VFIO_DEVICE_RESET:
1185 return mbochs_reset(mdev);
1186 }
1187 return -ENOTTY;
1188}
1189
1190static int mbochs_open(struct mdev_device *mdev)
1191{
1192 if (!try_module_get(THIS_MODULE))
1193 return -ENODEV;
1194
1195 return 0;
1196}
1197
1198static void mbochs_close(struct mdev_device *mdev)
1199{
1200 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1201 struct mbochs_dmabuf *dmabuf, *tmp;
1202
1203 mutex_lock(&mdev_state->ops_lock);
1204
1205 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) {
1206 list_del(&dmabuf->next);
1207 if (dmabuf->buf) {
1208
1209 dmabuf->unlinked = true;
1210 } else {
1211 kfree(dmabuf);
1212 }
1213 }
1214 mbochs_put_pages(mdev_state);
1215
1216 mutex_unlock(&mdev_state->ops_lock);
1217 module_put(THIS_MODULE);
1218}
1219
1220static ssize_t
1221memory_show(struct device *dev, struct device_attribute *attr,
1222 char *buf)
1223{
1224 struct mdev_device *mdev = mdev_from_dev(dev);
1225 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1226
1227 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes);
1228}
1229static DEVICE_ATTR_RO(memory);
1230
1231static struct attribute *mdev_dev_attrs[] = {
1232 &dev_attr_memory.attr,
1233 NULL,
1234};
1235
1236static const struct attribute_group mdev_dev_group = {
1237 .name = "vendor",
1238 .attrs = mdev_dev_attrs,
1239};
1240
1241const struct attribute_group *mdev_dev_groups[] = {
1242 &mdev_dev_group,
1243 NULL,
1244};
1245
1246static ssize_t
1247name_show(struct kobject *kobj, struct device *dev, char *buf)
1248{
1249 return sprintf(buf, "%s\n", kobj->name);
1250}
1251MDEV_TYPE_ATTR_RO(name);
1252
1253static ssize_t
1254description_show(struct kobject *kobj, struct device *dev, char *buf)
1255{
1256 const struct mbochs_type *type = mbochs_find_type(kobj);
1257
1258 return sprintf(buf, "virtual display, %d MB video memory\n",
1259 type ? type->mbytes : 0);
1260}
1261MDEV_TYPE_ATTR_RO(description);
1262
1263static ssize_t
1264available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
1265{
1266 const struct mbochs_type *type = mbochs_find_type(kobj);
1267 int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
1268
1269 return sprintf(buf, "%d\n", count);
1270}
1271MDEV_TYPE_ATTR_RO(available_instances);
1272
1273static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
1274 char *buf)
1275{
1276 return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
1277}
1278MDEV_TYPE_ATTR_RO(device_api);
1279
1280static struct attribute *mdev_types_attrs[] = {
1281 &mdev_type_attr_name.attr,
1282 &mdev_type_attr_description.attr,
1283 &mdev_type_attr_device_api.attr,
1284 &mdev_type_attr_available_instances.attr,
1285 NULL,
1286};
1287
1288static struct attribute_group mdev_type_group1 = {
1289 .name = MBOCHS_TYPE_1,
1290 .attrs = mdev_types_attrs,
1291};
1292
1293static struct attribute_group mdev_type_group2 = {
1294 .name = MBOCHS_TYPE_2,
1295 .attrs = mdev_types_attrs,
1296};
1297
1298static struct attribute_group mdev_type_group3 = {
1299 .name = MBOCHS_TYPE_3,
1300 .attrs = mdev_types_attrs,
1301};
1302
1303static struct attribute_group *mdev_type_groups[] = {
1304 &mdev_type_group1,
1305 &mdev_type_group2,
1306 &mdev_type_group3,
1307 NULL,
1308};
1309
1310static const struct mdev_parent_ops mdev_fops = {
1311 .owner = THIS_MODULE,
1312 .mdev_attr_groups = mdev_dev_groups,
1313 .supported_type_groups = mdev_type_groups,
1314 .create = mbochs_create,
1315 .remove = mbochs_remove,
1316 .open = mbochs_open,
1317 .release = mbochs_close,
1318 .read = mbochs_read,
1319 .write = mbochs_write,
1320 .ioctl = mbochs_ioctl,
1321 .mmap = mbochs_mmap,
1322};
1323
1324static const struct file_operations vd_fops = {
1325 .owner = THIS_MODULE,
1326};
1327
1328static void mbochs_device_release(struct device *dev)
1329{
1330
1331}
1332
1333static int __init mbochs_dev_init(void)
1334{
1335 int ret = 0;
1336
1337 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK, MBOCHS_NAME);
1338 if (ret < 0) {
1339 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
1340 return ret;
1341 }
1342 cdev_init(&mbochs_cdev, &vd_fops);
1343 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK);
1344 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
1345
1346 mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
1347 if (IS_ERR(mbochs_class)) {
1348 pr_err("Error: failed to register mbochs_dev class\n");
1349 ret = PTR_ERR(mbochs_class);
1350 goto failed1;
1351 }
1352 mbochs_dev.class = mbochs_class;
1353 mbochs_dev.release = mbochs_device_release;
1354 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME);
1355
1356 ret = device_register(&mbochs_dev);
1357 if (ret)
1358 goto failed2;
1359
1360 ret = mdev_register_device(&mbochs_dev, &mdev_fops);
1361 if (ret)
1362 goto failed3;
1363
1364 return 0;
1365
1366failed3:
1367 device_unregister(&mbochs_dev);
1368failed2:
1369 class_destroy(mbochs_class);
1370failed1:
1371 cdev_del(&mbochs_cdev);
1372 unregister_chrdev_region(mbochs_devt, MINORMASK);
1373 return ret;
1374}
1375
1376static void __exit mbochs_dev_exit(void)
1377{
1378 mbochs_dev.bus = NULL;
1379 mdev_unregister_device(&mbochs_dev);
1380
1381 device_unregister(&mbochs_dev);
1382 cdev_del(&mbochs_cdev);
1383 unregister_chrdev_region(mbochs_devt, MINORMASK);
1384 class_destroy(mbochs_class);
1385 mbochs_class = NULL;
1386}
1387
1388module_init(mbochs_dev_init)
1389module_exit(mbochs_dev_exit)
1390
