1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22#include <linux/init.h>
23#include <linux/module.h>
24#include <linux/device.h>
25#include <linux/kernel.h>
26#include <linux/slab.h>
27#include <linux/vmalloc.h>
28#include <linux/cdev.h>
29#include <linux/vfio.h>
30#include <linux/iommu.h>
31#include <linux/sysfs.h>
32#include <linux/mdev.h>
33#include <linux/pci.h>
34#include <linux/dma-buf.h>
35#include <linux/highmem.h>
36#include <drm/drm_fourcc.h>
37#include <drm/drm_rect.h>
38#include <drm/drm_modeset_lock.h>
39#include <drm/drm_property.h>
40#include <drm/drm_plane.h>
41
42
43#define VBE_DISPI_INDEX_ID 0x0
44#define VBE_DISPI_INDEX_XRES 0x1
45#define VBE_DISPI_INDEX_YRES 0x2
46#define VBE_DISPI_INDEX_BPP 0x3
47#define VBE_DISPI_INDEX_ENABLE 0x4
48#define VBE_DISPI_INDEX_BANK 0x5
49#define VBE_DISPI_INDEX_VIRT_WIDTH 0x6
50#define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7
51#define VBE_DISPI_INDEX_X_OFFSET 0x8
52#define VBE_DISPI_INDEX_Y_OFFSET 0x9
53#define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa
54#define VBE_DISPI_INDEX_COUNT 0xb
55
56#define VBE_DISPI_ID0 0xB0C0
57#define VBE_DISPI_ID1 0xB0C1
58#define VBE_DISPI_ID2 0xB0C2
59#define VBE_DISPI_ID3 0xB0C3
60#define VBE_DISPI_ID4 0xB0C4
61#define VBE_DISPI_ID5 0xB0C5
62
63#define VBE_DISPI_DISABLED 0x00
64#define VBE_DISPI_ENABLED 0x01
65#define VBE_DISPI_GETCAPS 0x02
66#define VBE_DISPI_8BIT_DAC 0x20
67#define VBE_DISPI_LFB_ENABLED 0x40
68#define VBE_DISPI_NOCLEARMEM 0x80
69
70
71#define MBOCHS_NAME "mbochs"
72#define MBOCHS_CLASS_NAME "mbochs"
73
74#define MBOCHS_EDID_REGION_INDEX VFIO_PCI_NUM_REGIONS
75#define MBOCHS_NUM_REGIONS (MBOCHS_EDID_REGION_INDEX+1)
76
77#define MBOCHS_CONFIG_SPACE_SIZE 0xff
78#define MBOCHS_MMIO_BAR_OFFSET PAGE_SIZE
79#define MBOCHS_MMIO_BAR_SIZE PAGE_SIZE
80#define MBOCHS_EDID_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \
81 MBOCHS_MMIO_BAR_SIZE)
82#define MBOCHS_EDID_SIZE PAGE_SIZE
83#define MBOCHS_MEMORY_BAR_OFFSET (MBOCHS_EDID_OFFSET + \
84 MBOCHS_EDID_SIZE)
85
86#define MBOCHS_EDID_BLOB_OFFSET (MBOCHS_EDID_SIZE/2)
87
88#define STORE_LE16(addr, val) (*(u16 *)addr = val)
89#define STORE_LE32(addr, val) (*(u32 *)addr = val)
90
91
92MODULE_LICENSE("GPL v2");
93
94static int max_mbytes = 256;
95module_param_named(count, max_mbytes, int, 0444);
96MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices");
97
98
99#define MBOCHS_TYPE_1 "small"
100#define MBOCHS_TYPE_2 "medium"
101#define MBOCHS_TYPE_3 "large"
102
103static const struct mbochs_type {
104 const char *name;
105 u32 mbytes;
106 u32 max_x;
107 u32 max_y;
108} mbochs_types[] = {
109 {
110 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1,
111 .mbytes = 4,
112 .max_x = 800,
113 .max_y = 600,
114 }, {
115 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2,
116 .mbytes = 16,
117 .max_x = 1920,
118 .max_y = 1440,
119 }, {
120 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3,
121 .mbytes = 64,
122 .max_x = 0,
123 .max_y = 0,
124 },
125};
126
127
128static dev_t mbochs_devt;
129static struct class *mbochs_class;
130static struct cdev mbochs_cdev;
131static struct device mbochs_dev;
132static int mbochs_used_mbytes;
133static const struct vfio_device_ops mbochs_dev_ops;
134
135struct vfio_region_info_ext {
136 struct vfio_region_info base;
137 struct vfio_region_info_cap_type type;
138};
139
140struct mbochs_mode {
141 u32 drm_format;
142 u32 bytepp;
143 u32 width;
144 u32 height;
145 u32 stride;
146 u32 __pad;
147 u64 offset;
148 u64 size;
149};
150
151struct mbochs_dmabuf {
152 struct mbochs_mode mode;
153 u32 id;
154 struct page **pages;
155 pgoff_t pagecount;
156 struct dma_buf *buf;
157 struct mdev_state *mdev_state;
158 struct list_head next;
159 bool unlinked;
160};
161
162
163struct mdev_state {
164 struct vfio_device vdev;
165 u8 *vconfig;
166 u64 bar_mask[3];
167 u32 memory_bar_mask;
168 struct mutex ops_lock;
169 struct mdev_device *mdev;
170
171 const struct mbochs_type *type;
172 u16 vbe[VBE_DISPI_INDEX_COUNT];
173 u64 memsize;
174 struct page **pages;
175 pgoff_t pagecount;
176 struct vfio_region_gfx_edid edid_regs;
177 u8 edid_blob[0x400];
178
179 struct list_head dmabufs;
180 u32 active_id;
181 u32 next_id;
182};
183
184static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = {
185 [VBE_DISPI_INDEX_ID] = "id",
186 [VBE_DISPI_INDEX_XRES] = "xres",
187 [VBE_DISPI_INDEX_YRES] = "yres",
188 [VBE_DISPI_INDEX_BPP] = "bpp",
189 [VBE_DISPI_INDEX_ENABLE] = "enable",
190 [VBE_DISPI_INDEX_BANK] = "bank",
191 [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width",
192 [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height",
193 [VBE_DISPI_INDEX_X_OFFSET] = "x-offset",
194 [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset",
195 [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem",
196};
197
198static const char *vbe_name(u32 index)
199{
200 if (index < ARRAY_SIZE(vbe_name_list))
201 return vbe_name_list[index];
202 return "(invalid)";
203}
204
205static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
206 pgoff_t pgoff);
207static struct page *mbochs_get_page(struct mdev_state *mdev_state,
208 pgoff_t pgoff);
209
210static void mbochs_create_config_space(struct mdev_state *mdev_state)
211{
212 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID],
213 0x1234);
214 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID],
215 0x1111);
216 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID],
217 PCI_SUBVENDOR_ID_REDHAT_QUMRANET);
218 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID],
219 PCI_SUBDEVICE_ID_QEMU);
220
221 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND],
222 PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
223 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE],
224 PCI_CLASS_DISPLAY_OTHER);
225 mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01;
226
227 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0],
228 PCI_BASE_ADDRESS_SPACE_MEMORY |
229 PCI_BASE_ADDRESS_MEM_TYPE_32 |
230 PCI_BASE_ADDRESS_MEM_PREFETCH);
231 mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1;
232
233 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2],
234 PCI_BASE_ADDRESS_SPACE_MEMORY |
235 PCI_BASE_ADDRESS_MEM_TYPE_32);
236 mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1;
237}
238
239static int mbochs_check_framebuffer(struct mdev_state *mdev_state,
240 struct mbochs_mode *mode)
241{
242 struct device *dev = mdev_dev(mdev_state->mdev);
243 u16 *vbe = mdev_state->vbe;
244 u32 virt_width;
245
246 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
247
248 if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED))
249 goto nofb;
250
251 memset(mode, 0, sizeof(*mode));
252 switch (vbe[VBE_DISPI_INDEX_BPP]) {
253 case 32:
254 mode->drm_format = DRM_FORMAT_XRGB8888;
255 mode->bytepp = 4;
256 break;
257 default:
258 dev_info_ratelimited(dev, "%s: bpp %d not supported\n",
259 __func__, vbe[VBE_DISPI_INDEX_BPP]);
260 goto nofb;
261 }
262
263 mode->width = vbe[VBE_DISPI_INDEX_XRES];
264 mode->height = vbe[VBE_DISPI_INDEX_YRES];
265 virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH];
266 if (virt_width < mode->width)
267 virt_width = mode->width;
268 mode->stride = virt_width * mode->bytepp;
269 mode->size = (u64)mode->stride * mode->height;
270 mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp +
271 (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride);
272
273 if (mode->width < 64 || mode->height < 64) {
274 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n",
275 __func__, mode->width, mode->height);
276 goto nofb;
277 }
278 if (mode->offset + mode->size > mdev_state->memsize) {
279 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n",
280 __func__);
281 goto nofb;
282 }
283
284 return 0;
285
286nofb:
287 memset(mode, 0, sizeof(*mode));
288 return -EINVAL;
289}
290
291static bool mbochs_modes_equal(struct mbochs_mode *mode1,
292 struct mbochs_mode *mode2)
293{
294 return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0;
295}
296
297static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
298 char *buf, u32 count)
299{
300 struct device *dev = mdev_dev(mdev_state->mdev);
301 int index = (offset - PCI_BASE_ADDRESS_0) / 0x04;
302 u32 cfg_addr;
303
304 switch (offset) {
305 case PCI_BASE_ADDRESS_0:
306 case PCI_BASE_ADDRESS_2:
307 cfg_addr = *(u32 *)buf;
308
309 if (cfg_addr == 0xffffffff) {
310 cfg_addr = (cfg_addr & mdev_state->bar_mask[index]);
311 } else {
312 cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK;
313 if (cfg_addr)
314 dev_info(dev, "BAR #%d @ 0x%x\n",
315 index, cfg_addr);
316 }
317
318 cfg_addr |= (mdev_state->vconfig[offset] &
319 ~PCI_BASE_ADDRESS_MEM_MASK);
320 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr);
321 break;
322 }
323}
324
325static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset,
326 char *buf, u32 count)
327{
328 struct device *dev = mdev_dev(mdev_state->mdev);
329 int index;
330 u16 reg16;
331
332 switch (offset) {
333 case 0x400 ... 0x41f:
334 goto unhandled;
335 case 0x500 ... 0x515:
336 if (count != 2)
337 goto unhandled;
338 index = (offset - 0x500) / 2;
339 reg16 = *(u16 *)buf;
340 if (index < ARRAY_SIZE(mdev_state->vbe))
341 mdev_state->vbe[index] = reg16;
342 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n",
343 __func__, index, reg16, vbe_name(index));
344 break;
345 case 0x600 ... 0x607:
346 goto unhandled;
347 default:
348unhandled:
349 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
350 __func__, offset, count);
351 break;
352 }
353}
354
355static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset,
356 char *buf, u32 count)
357{
358 struct device *dev = mdev_dev(mdev_state->mdev);
359 struct vfio_region_gfx_edid *edid;
360 u16 reg16 = 0;
361 int index;
362
363 switch (offset) {
364 case 0x000 ... 0x3ff:
365 edid = &mdev_state->edid_regs;
366 if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP ||
367 offset >= edid->edid_size) {
368 memset(buf, 0, count);
369 break;
370 }
371 memcpy(buf, mdev_state->edid_blob + offset, count);
372 break;
373 case 0x500 ... 0x515:
374 if (count != 2)
375 goto unhandled;
376 index = (offset - 0x500) / 2;
377 if (index < ARRAY_SIZE(mdev_state->vbe))
378 reg16 = mdev_state->vbe[index];
379 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n",
380 __func__, index, reg16, vbe_name(index));
381 *(u16 *)buf = reg16;
382 break;
383 default:
384unhandled:
385 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
386 __func__, offset, count);
387 memset(buf, 0, count);
388 break;
389 }
390}
391
392static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset,
393 char *buf, u32 count, bool is_write)
394{
395 char *regs = (void *)&mdev_state->edid_regs;
396
397 if (offset + count > sizeof(mdev_state->edid_regs))
398 return;
399 if (count != 4)
400 return;
401 if (offset % 4)
402 return;
403
404 if (is_write) {
405 switch (offset) {
406 case offsetof(struct vfio_region_gfx_edid, link_state):
407 case offsetof(struct vfio_region_gfx_edid, edid_size):
408 memcpy(regs + offset, buf, count);
409 break;
410 default:
411
412 break;
413 }
414 } else {
415 memcpy(buf, regs + offset, count);
416 }
417}
418
419static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset,
420 char *buf, u32 count, bool is_write)
421{
422 if (offset + count > mdev_state->edid_regs.edid_max_size)
423 return;
424 if (is_write)
425 memcpy(mdev_state->edid_blob + offset, buf, count);
426 else
427 memcpy(buf, mdev_state->edid_blob + offset, count);
428}
429
430static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf,
431 size_t count, loff_t pos, bool is_write)
432{
433 struct page *pg;
434 loff_t poff;
435 char *map;
436 int ret = 0;
437
438 mutex_lock(&mdev_state->ops_lock);
439
440 if (pos < MBOCHS_CONFIG_SPACE_SIZE) {
441 if (is_write)
442 handle_pci_cfg_write(mdev_state, pos, buf, count);
443 else
444 memcpy(buf, (mdev_state->vconfig + pos), count);
445
446 } else if (pos >= MBOCHS_MMIO_BAR_OFFSET &&
447 pos + count <= (MBOCHS_MMIO_BAR_OFFSET +
448 MBOCHS_MMIO_BAR_SIZE)) {
449 pos -= MBOCHS_MMIO_BAR_OFFSET;
450 if (is_write)
451 handle_mmio_write(mdev_state, pos, buf, count);
452 else
453 handle_mmio_read(mdev_state, pos, buf, count);
454
455 } else if (pos >= MBOCHS_EDID_OFFSET &&
456 pos + count <= (MBOCHS_EDID_OFFSET +
457 MBOCHS_EDID_SIZE)) {
458 pos -= MBOCHS_EDID_OFFSET;
459 if (pos < MBOCHS_EDID_BLOB_OFFSET) {
460 handle_edid_regs(mdev_state, pos, buf, count, is_write);
461 } else {
462 pos -= MBOCHS_EDID_BLOB_OFFSET;
463 handle_edid_blob(mdev_state, pos, buf, count, is_write);
464 }
465
466 } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET &&
467 pos + count <=
468 MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) {
469 pos -= MBOCHS_MMIO_BAR_OFFSET;
470 poff = pos & ~PAGE_MASK;
471 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT);
472 map = kmap(pg);
473 if (is_write)
474 memcpy(map + poff, buf, count);
475 else
476 memcpy(buf, map + poff, count);
477 kunmap(pg);
478 put_page(pg);
479
480 } else {
481 dev_dbg(mdev_state->vdev.dev, "%s: %s @0x%llx (unhandled)\n",
482 __func__, is_write ? "WR" : "RD", pos);
483 ret = -1;
484 goto accessfailed;
485 }
486
487 ret = count;
488
489
490accessfailed:
491 mutex_unlock(&mdev_state->ops_lock);
492
493 return ret;
494}
495
496static int mbochs_reset(struct mdev_state *mdev_state)
497{
498 u32 size64k = mdev_state->memsize / (64 * 1024);
499 int i;
500
501 for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++)
502 mdev_state->vbe[i] = 0;
503 mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5;
504 mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k;
505 return 0;
506}
507
508static int mbochs_probe(struct mdev_device *mdev)
509{
510 const struct mbochs_type *type =
511 &mbochs_types[mdev_get_type_group_id(mdev)];
512 struct device *dev = mdev_dev(mdev);
513 struct mdev_state *mdev_state;
514 int ret = -ENOMEM;
515
516 if (type->mbytes + mbochs_used_mbytes > max_mbytes)
517 return -ENOMEM;
518
519 mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
520 if (mdev_state == NULL)
521 return -ENOMEM;
522 vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mbochs_dev_ops);
523
524 mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
525 if (mdev_state->vconfig == NULL)
526 goto err_mem;
527
528 mdev_state->memsize = type->mbytes * 1024 * 1024;
529 mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT;
530 mdev_state->pages = kcalloc(mdev_state->pagecount,
531 sizeof(struct page *),
532 GFP_KERNEL);
533 if (!mdev_state->pages)
534 goto err_mem;
535
536 dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__,
537 type->name, type->mbytes, mdev_state->pagecount);
538
539 mutex_init(&mdev_state->ops_lock);
540 mdev_state->mdev = mdev;
541 INIT_LIST_HEAD(&mdev_state->dmabufs);
542 mdev_state->next_id = 1;
543
544 mdev_state->type = type;
545 mdev_state->edid_regs.max_xres = type->max_x;
546 mdev_state->edid_regs.max_yres = type->max_y;
547 mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET;
548 mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob);
549 mbochs_create_config_space(mdev_state);
550 mbochs_reset(mdev_state);
551
552 mbochs_used_mbytes += type->mbytes;
553
554 ret = vfio_register_group_dev(&mdev_state->vdev);
555 if (ret)
556 goto err_mem;
557 dev_set_drvdata(&mdev->dev, mdev_state);
558 return 0;
559
560err_mem:
561 kfree(mdev_state->vconfig);
562 kfree(mdev_state);
563 return ret;
564}
565
566static void mbochs_remove(struct mdev_device *mdev)
567{
568 struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
569
570 mbochs_used_mbytes -= mdev_state->type->mbytes;
571 vfio_unregister_group_dev(&mdev_state->vdev);
572 kfree(mdev_state->pages);
573 kfree(mdev_state->vconfig);
574 kfree(mdev_state);
575}
576
577static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf,
578 size_t count, loff_t *ppos)
579{
580 struct mdev_state *mdev_state =
581 container_of(vdev, struct mdev_state, vdev);
582 unsigned int done = 0;
583 int ret;
584
585 while (count) {
586 size_t filled;
587
588 if (count >= 4 && !(*ppos % 4)) {
589 u32 val;
590
591 ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
592 *ppos, false);
593 if (ret <= 0)
594 goto read_err;
595
596 if (copy_to_user(buf, &val, sizeof(val)))
597 goto read_err;
598
599 filled = 4;
600 } else if (count >= 2 && !(*ppos % 2)) {
601 u16 val;
602
603 ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
604 *ppos, false);
605 if (ret <= 0)
606 goto read_err;
607
608 if (copy_to_user(buf, &val, sizeof(val)))
609 goto read_err;
610
611 filled = 2;
612 } else {
613 u8 val;
614
615 ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
616 *ppos, false);
617 if (ret <= 0)
618 goto read_err;
619
620 if (copy_to_user(buf, &val, sizeof(val)))
621 goto read_err;
622
623 filled = 1;
624 }
625
626 count -= filled;
627 done += filled;
628 *ppos += filled;
629 buf += filled;
630 }
631
632 return done;
633
634read_err:
635 return -EFAULT;
636}
637
638static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf,
639 size_t count, loff_t *ppos)
640{
641 struct mdev_state *mdev_state =
642 container_of(vdev, struct mdev_state, vdev);
643 unsigned int done = 0;
644 int ret;
645
646 while (count) {
647 size_t filled;
648
649 if (count >= 4 && !(*ppos % 4)) {
650 u32 val;
651
652 if (copy_from_user(&val, buf, sizeof(val)))
653 goto write_err;
654
655 ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
656 *ppos, true);
657 if (ret <= 0)
658 goto write_err;
659
660 filled = 4;
661 } else if (count >= 2 && !(*ppos % 2)) {
662 u16 val;
663
664 if (copy_from_user(&val, buf, sizeof(val)))
665 goto write_err;
666
667 ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
668 *ppos, true);
669 if (ret <= 0)
670 goto write_err;
671
672 filled = 2;
673 } else {
674 u8 val;
675
676 if (copy_from_user(&val, buf, sizeof(val)))
677 goto write_err;
678
679 ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
680 *ppos, true);
681 if (ret <= 0)
682 goto write_err;
683
684 filled = 1;
685 }
686 count -= filled;
687 done += filled;
688 *ppos += filled;
689 buf += filled;
690 }
691
692 return done;
693write_err:
694 return -EFAULT;
695}
696
697static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
698 pgoff_t pgoff)
699{
700 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
701
702 if (!mdev_state->pages[pgoff]) {
703 mdev_state->pages[pgoff] =
704 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0);
705 if (!mdev_state->pages[pgoff])
706 return NULL;
707 }
708
709 get_page(mdev_state->pages[pgoff]);
710 return mdev_state->pages[pgoff];
711}
712
713static struct page *mbochs_get_page(struct mdev_state *mdev_state,
714 pgoff_t pgoff)
715{
716 struct page *page;
717
718 if (WARN_ON(pgoff >= mdev_state->pagecount))
719 return NULL;
720
721 mutex_lock(&mdev_state->ops_lock);
722 page = __mbochs_get_page(mdev_state, pgoff);
723 mutex_unlock(&mdev_state->ops_lock);
724
725 return page;
726}
727
728static void mbochs_put_pages(struct mdev_state *mdev_state)
729{
730 struct device *dev = mdev_dev(mdev_state->mdev);
731 int i, count = 0;
732
733 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
734
735 for (i = 0; i < mdev_state->pagecount; i++) {
736 if (!mdev_state->pages[i])
737 continue;
738 put_page(mdev_state->pages[i]);
739 mdev_state->pages[i] = NULL;
740 count++;
741 }
742 dev_dbg(dev, "%s: %d pages released\n", __func__, count);
743}
744
745static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf)
746{
747 struct vm_area_struct *vma = vmf->vma;
748 struct mdev_state *mdev_state = vma->vm_private_data;
749 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
750
751 if (page_offset >= mdev_state->pagecount)
752 return VM_FAULT_SIGBUS;
753
754 vmf->page = mbochs_get_page(mdev_state, page_offset);
755 if (!vmf->page)
756 return VM_FAULT_SIGBUS;
757
758 return 0;
759}
760
761static const struct vm_operations_struct mbochs_region_vm_ops = {
762 .fault = mbochs_region_vm_fault,
763};
764
765static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma)
766{
767 struct mdev_state *mdev_state =
768 container_of(vdev, struct mdev_state, vdev);
769
770 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
771 return -EINVAL;
772 if (vma->vm_end < vma->vm_start)
773 return -EINVAL;
774 if (vma->vm_end - vma->vm_start > mdev_state->memsize)
775 return -EINVAL;
776 if ((vma->vm_flags & VM_SHARED) == 0)
777 return -EINVAL;
778
779 vma->vm_ops = &mbochs_region_vm_ops;
780 vma->vm_private_data = mdev_state;
781 return 0;
782}
783
784static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf)
785{
786 struct vm_area_struct *vma = vmf->vma;
787 struct mbochs_dmabuf *dmabuf = vma->vm_private_data;
788
789 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount))
790 return VM_FAULT_SIGBUS;
791
792 vmf->page = dmabuf->pages[vmf->pgoff];
793 get_page(vmf->page);
794 return 0;
795}
796
797static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
798 .fault = mbochs_dmabuf_vm_fault,
799};
800
801static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
802{
803 struct mbochs_dmabuf *dmabuf = buf->priv;
804 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
805
806 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
807
808 if ((vma->vm_flags & VM_SHARED) == 0)
809 return -EINVAL;
810
811 vma->vm_ops = &mbochs_dmabuf_vm_ops;
812 vma->vm_private_data = dmabuf;
813 return 0;
814}
815
816static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf,
817 const char *prefix)
818{
819 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
820 u32 fourcc = dmabuf->mode.drm_format;
821
822 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n",
823 prefix, dmabuf->id,
824 fourcc ? ((fourcc >> 0) & 0xff) : '-',
825 fourcc ? ((fourcc >> 8) & 0xff) : '-',
826 fourcc ? ((fourcc >> 16) & 0xff) : '-',
827 fourcc ? ((fourcc >> 24) & 0xff) : '-',
828 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride,
829 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount);
830}
831
832static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at,
833 enum dma_data_direction direction)
834{
835 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
836 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
837 struct sg_table *sg;
838
839 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
840
841 sg = kzalloc(sizeof(*sg), GFP_KERNEL);
842 if (!sg)
843 goto err1;
844 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount,
845 0, dmabuf->mode.size, GFP_KERNEL) < 0)
846 goto err2;
847 if (dma_map_sgtable(at->dev, sg, direction, 0))
848 goto err3;
849
850 return sg;
851
852err3:
853 sg_free_table(sg);
854err2:
855 kfree(sg);
856err1:
857 return ERR_PTR(-ENOMEM);
858}
859
860static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at,
861 struct sg_table *sg,
862 enum dma_data_direction direction)
863{
864 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
865 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
866
867 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
868
869 dma_unmap_sgtable(at->dev, sg, direction, 0);
870 sg_free_table(sg);
871 kfree(sg);
872}
873
874static void mbochs_release_dmabuf(struct dma_buf *buf)
875{
876 struct mbochs_dmabuf *dmabuf = buf->priv;
877 struct mdev_state *mdev_state = dmabuf->mdev_state;
878 struct device *dev = mdev_dev(mdev_state->mdev);
879 pgoff_t pg;
880
881 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
882
883 for (pg = 0; pg < dmabuf->pagecount; pg++)
884 put_page(dmabuf->pages[pg]);
885
886 mutex_lock(&mdev_state->ops_lock);
887 dmabuf->buf = NULL;
888 if (dmabuf->unlinked)
889 kfree(dmabuf);
890 mutex_unlock(&mdev_state->ops_lock);
891}
892
893static struct dma_buf_ops mbochs_dmabuf_ops = {
894 .map_dma_buf = mbochs_map_dmabuf,
895 .unmap_dma_buf = mbochs_unmap_dmabuf,
896 .release = mbochs_release_dmabuf,
897 .mmap = mbochs_mmap_dmabuf,
898};
899
900static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state,
901 struct mbochs_mode *mode)
902{
903 struct mbochs_dmabuf *dmabuf;
904 pgoff_t page_offset, pg;
905
906 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
907
908 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL);
909 if (!dmabuf)
910 return NULL;
911
912 dmabuf->mode = *mode;
913 dmabuf->id = mdev_state->next_id++;
914 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE);
915 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *),
916 GFP_KERNEL);
917 if (!dmabuf->pages)
918 goto err_free_dmabuf;
919
920 page_offset = dmabuf->mode.offset >> PAGE_SHIFT;
921 for (pg = 0; pg < dmabuf->pagecount; pg++) {
922 dmabuf->pages[pg] = __mbochs_get_page(mdev_state,
923 page_offset + pg);
924 if (!dmabuf->pages[pg])
925 goto err_free_pages;
926 }
927
928 dmabuf->mdev_state = mdev_state;
929 list_add(&dmabuf->next, &mdev_state->dmabufs);
930
931 mbochs_print_dmabuf(dmabuf, __func__);
932 return dmabuf;
933
934err_free_pages:
935 while (pg > 0)
936 put_page(dmabuf->pages[--pg]);
937 kfree(dmabuf->pages);
938err_free_dmabuf:
939 kfree(dmabuf);
940 return NULL;
941}
942
943static struct mbochs_dmabuf *
944mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state,
945 struct mbochs_mode *mode)
946{
947 struct mbochs_dmabuf *dmabuf;
948
949 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
950
951 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
952 if (mbochs_modes_equal(&dmabuf->mode, mode))
953 return dmabuf;
954
955 return NULL;
956}
957
958static struct mbochs_dmabuf *
959mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
960{
961 struct mbochs_dmabuf *dmabuf;
962
963 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
964
965 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
966 if (dmabuf->id == id)
967 return dmabuf;
968
969 return NULL;
970}
971
972static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
973{
974 struct mdev_state *mdev_state = dmabuf->mdev_state;
975 struct device *dev = mdev_state->vdev.dev;
976 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
977 struct dma_buf *buf;
978
979 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
980
981 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) {
982 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n",
983 __func__);
984 return -EINVAL;
985 }
986
987 exp_info.ops = &mbochs_dmabuf_ops;
988 exp_info.size = dmabuf->mode.size;
989 exp_info.priv = dmabuf;
990
991 buf = dma_buf_export(&exp_info);
992 if (IS_ERR(buf)) {
993 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n",
994 __func__, PTR_ERR(buf));
995 return PTR_ERR(buf);
996 }
997
998 dmabuf->buf = buf;
999 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
1000 return 0;
1001}
1002
1003static int mbochs_get_region_info(struct mdev_state *mdev_state,
1004 struct vfio_region_info_ext *ext)
1005{
1006 struct vfio_region_info *region_info = &ext->base;
1007
1008 if (region_info->index >= MBOCHS_NUM_REGIONS)
1009 return -EINVAL;
1010
1011 switch (region_info->index) {
1012 case VFIO_PCI_CONFIG_REGION_INDEX:
1013 region_info->offset = 0;
1014 region_info->size = MBOCHS_CONFIG_SPACE_SIZE;
1015 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1016 VFIO_REGION_INFO_FLAG_WRITE);
1017 break;
1018 case VFIO_PCI_BAR0_REGION_INDEX:
1019 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET;
1020 region_info->size = mdev_state->memsize;
1021 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1022 VFIO_REGION_INFO_FLAG_WRITE |
1023 VFIO_REGION_INFO_FLAG_MMAP);
1024 break;
1025 case VFIO_PCI_BAR2_REGION_INDEX:
1026 region_info->offset = MBOCHS_MMIO_BAR_OFFSET;
1027 region_info->size = MBOCHS_MMIO_BAR_SIZE;
1028 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1029 VFIO_REGION_INFO_FLAG_WRITE);
1030 break;
1031 case MBOCHS_EDID_REGION_INDEX:
1032 ext->base.argsz = sizeof(*ext);
1033 ext->base.offset = MBOCHS_EDID_OFFSET;
1034 ext->base.size = MBOCHS_EDID_SIZE;
1035 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ |
1036 VFIO_REGION_INFO_FLAG_WRITE |
1037 VFIO_REGION_INFO_FLAG_CAPS);
1038 ext->base.cap_offset = offsetof(typeof(*ext), type);
1039 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE;
1040 ext->type.header.version = 1;
1041 ext->type.header.next = 0;
1042 ext->type.type = VFIO_REGION_TYPE_GFX;
1043 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID;
1044 break;
1045 default:
1046 region_info->size = 0;
1047 region_info->offset = 0;
1048 region_info->flags = 0;
1049 }
1050
1051 return 0;
1052}
1053
1054static int mbochs_get_irq_info(struct vfio_irq_info *irq_info)
1055{
1056 irq_info->count = 0;
1057 return 0;
1058}
1059
1060static int mbochs_get_device_info(struct vfio_device_info *dev_info)
1061{
1062 dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
1063 dev_info->num_regions = MBOCHS_NUM_REGIONS;
1064 dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
1065 return 0;
1066}
1067
1068static int mbochs_query_gfx_plane(struct mdev_state *mdev_state,
1069 struct vfio_device_gfx_plane_info *plane)
1070{
1071 struct mbochs_dmabuf *dmabuf;
1072 struct mbochs_mode mode;
1073 int ret;
1074
1075 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
1076 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
1077 VFIO_GFX_PLANE_TYPE_DMABUF))
1078 return 0;
1079 return -EINVAL;
1080 }
1081
1082 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF)
1083 return -EINVAL;
1084
1085 plane->drm_format_mod = 0;
1086 plane->x_pos = 0;
1087 plane->y_pos = 0;
1088 plane->x_hot = 0;
1089 plane->y_hot = 0;
1090
1091 mutex_lock(&mdev_state->ops_lock);
1092
1093 ret = -EINVAL;
1094 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY)
1095 ret = mbochs_check_framebuffer(mdev_state, &mode);
1096 if (ret < 0) {
1097 plane->drm_format = 0;
1098 plane->width = 0;
1099 plane->height = 0;
1100 plane->stride = 0;
1101 plane->size = 0;
1102 plane->dmabuf_id = 0;
1103 goto done;
1104 }
1105
1106 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode);
1107 if (!dmabuf)
1108 mbochs_dmabuf_alloc(mdev_state, &mode);
1109 if (!dmabuf) {
1110 mutex_unlock(&mdev_state->ops_lock);
1111 return -ENOMEM;
1112 }
1113
1114 plane->drm_format = dmabuf->mode.drm_format;
1115 plane->width = dmabuf->mode.width;
1116 plane->height = dmabuf->mode.height;
1117 plane->stride = dmabuf->mode.stride;
1118 plane->size = dmabuf->mode.size;
1119 plane->dmabuf_id = dmabuf->id;
1120
1121done:
1122 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY &&
1123 mdev_state->active_id != plane->dmabuf_id) {
1124 dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n",
1125 __func__, mdev_state->active_id, plane->dmabuf_id);
1126 mdev_state->active_id = plane->dmabuf_id;
1127 }
1128 mutex_unlock(&mdev_state->ops_lock);
1129 return 0;
1130}
1131
1132static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id)
1133{
1134 struct mbochs_dmabuf *dmabuf;
1135
1136 mutex_lock(&mdev_state->ops_lock);
1137
1138 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id);
1139 if (!dmabuf) {
1140 mutex_unlock(&mdev_state->ops_lock);
1141 return -ENOENT;
1142 }
1143
1144 if (!dmabuf->buf)
1145 mbochs_dmabuf_export(dmabuf);
1146
1147 mutex_unlock(&mdev_state->ops_lock);
1148
1149 if (!dmabuf->buf)
1150 return -EINVAL;
1151
1152 return dma_buf_fd(dmabuf->buf, 0);
1153}
1154
1155static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd,
1156 unsigned long arg)
1157{
1158 struct mdev_state *mdev_state =
1159 container_of(vdev, struct mdev_state, vdev);
1160 int ret = 0;
1161 unsigned long minsz, outsz;
1162
1163 switch (cmd) {
1164 case VFIO_DEVICE_GET_INFO:
1165 {
1166 struct vfio_device_info info;
1167
1168 minsz = offsetofend(struct vfio_device_info, num_irqs);
1169
1170 if (copy_from_user(&info, (void __user *)arg, minsz))
1171 return -EFAULT;
1172
1173 if (info.argsz < minsz)
1174 return -EINVAL;
1175
1176 ret = mbochs_get_device_info(&info);
1177 if (ret)
1178 return ret;
1179
1180 if (copy_to_user((void __user *)arg, &info, minsz))
1181 return -EFAULT;
1182
1183 return 0;
1184 }
1185 case VFIO_DEVICE_GET_REGION_INFO:
1186 {
1187 struct vfio_region_info_ext info;
1188
1189 minsz = offsetofend(typeof(info), base.offset);
1190
1191 if (copy_from_user(&info, (void __user *)arg, minsz))
1192 return -EFAULT;
1193
1194 outsz = info.base.argsz;
1195 if (outsz < minsz)
1196 return -EINVAL;
1197 if (outsz > sizeof(info))
1198 return -EINVAL;
1199
1200 ret = mbochs_get_region_info(mdev_state, &info);
1201 if (ret)
1202 return ret;
1203
1204 if (copy_to_user((void __user *)arg, &info, outsz))
1205 return -EFAULT;
1206
1207 return 0;
1208 }
1209
1210 case VFIO_DEVICE_GET_IRQ_INFO:
1211 {
1212 struct vfio_irq_info info;
1213
1214 minsz = offsetofend(struct vfio_irq_info, count);
1215
1216 if (copy_from_user(&info, (void __user *)arg, minsz))
1217 return -EFAULT;
1218
1219 if ((info.argsz < minsz) ||
1220 (info.index >= VFIO_PCI_NUM_IRQS))
1221 return -EINVAL;
1222
1223 ret = mbochs_get_irq_info(&info);
1224 if (ret)
1225 return ret;
1226
1227 if (copy_to_user((void __user *)arg, &info, minsz))
1228 return -EFAULT;
1229
1230 return 0;
1231 }
1232
1233 case VFIO_DEVICE_QUERY_GFX_PLANE:
1234 {
1235 struct vfio_device_gfx_plane_info plane;
1236
1237 minsz = offsetofend(struct vfio_device_gfx_plane_info,
1238 region_index);
1239
1240 if (copy_from_user(&plane, (void __user *)arg, minsz))
1241 return -EFAULT;
1242
1243 if (plane.argsz < minsz)
1244 return -EINVAL;
1245
1246 ret = mbochs_query_gfx_plane(mdev_state, &plane);
1247 if (ret)
1248 return ret;
1249
1250 if (copy_to_user((void __user *)arg, &plane, minsz))
1251 return -EFAULT;
1252
1253 return 0;
1254 }
1255
1256 case VFIO_DEVICE_GET_GFX_DMABUF:
1257 {
1258 u32 dmabuf_id;
1259
1260 if (get_user(dmabuf_id, (__u32 __user *)arg))
1261 return -EFAULT;
1262
1263 return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id);
1264 }
1265
1266 case VFIO_DEVICE_SET_IRQS:
1267 return -EINVAL;
1268
1269 case VFIO_DEVICE_RESET:
1270 return mbochs_reset(mdev_state);
1271 }
1272 return -ENOTTY;
1273}
1274
1275static int mbochs_open(struct vfio_device *vdev)
1276{
1277 if (!try_module_get(THIS_MODULE))
1278 return -ENODEV;
1279
1280 return 0;
1281}
1282
1283static void mbochs_close(struct vfio_device *vdev)
1284{
1285 struct mdev_state *mdev_state =
1286 container_of(vdev, struct mdev_state, vdev);
1287 struct mbochs_dmabuf *dmabuf, *tmp;
1288
1289 mutex_lock(&mdev_state->ops_lock);
1290
1291 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) {
1292 list_del(&dmabuf->next);
1293 if (dmabuf->buf) {
1294
1295 dmabuf->unlinked = true;
1296 } else {
1297 kfree(dmabuf);
1298 }
1299 }
1300 mbochs_put_pages(mdev_state);
1301
1302 mutex_unlock(&mdev_state->ops_lock);
1303 module_put(THIS_MODULE);
1304}
1305
1306static ssize_t
1307memory_show(struct device *dev, struct device_attribute *attr,
1308 char *buf)
1309{
1310 struct mdev_state *mdev_state = dev_get_drvdata(dev);
1311
1312 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes);
1313}
1314static DEVICE_ATTR_RO(memory);
1315
1316static struct attribute *mdev_dev_attrs[] = {
1317 &dev_attr_memory.attr,
1318 NULL,
1319};
1320
1321static const struct attribute_group mdev_dev_group = {
1322 .name = "vendor",
1323 .attrs = mdev_dev_attrs,
1324};
1325
1326static const struct attribute_group *mdev_dev_groups[] = {
1327 &mdev_dev_group,
1328 NULL,
1329};
1330
1331static ssize_t name_show(struct mdev_type *mtype,
1332 struct mdev_type_attribute *attr, char *buf)
1333{
1334 const struct mbochs_type *type =
1335 &mbochs_types[mtype_get_type_group_id(mtype)];
1336
1337 return sprintf(buf, "%s\n", type->name);
1338}
1339static MDEV_TYPE_ATTR_RO(name);
1340
1341static ssize_t description_show(struct mdev_type *mtype,
1342 struct mdev_type_attribute *attr, char *buf)
1343{
1344 const struct mbochs_type *type =
1345 &mbochs_types[mtype_get_type_group_id(mtype)];
1346
1347 return sprintf(buf, "virtual display, %d MB video memory\n",
1348 type ? type->mbytes : 0);
1349}
1350static MDEV_TYPE_ATTR_RO(description);
1351
1352static ssize_t available_instances_show(struct mdev_type *mtype,
1353 struct mdev_type_attribute *attr,
1354 char *buf)
1355{
1356 const struct mbochs_type *type =
1357 &mbochs_types[mtype_get_type_group_id(mtype)];
1358 int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
1359
1360 return sprintf(buf, "%d\n", count);
1361}
1362static MDEV_TYPE_ATTR_RO(available_instances);
1363
1364static ssize_t device_api_show(struct mdev_type *mtype,
1365 struct mdev_type_attribute *attr, char *buf)
1366{
1367 return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
1368}
1369static MDEV_TYPE_ATTR_RO(device_api);
1370
1371static struct attribute *mdev_types_attrs[] = {
1372 &mdev_type_attr_name.attr,
1373 &mdev_type_attr_description.attr,
1374 &mdev_type_attr_device_api.attr,
1375 &mdev_type_attr_available_instances.attr,
1376 NULL,
1377};
1378
1379static struct attribute_group mdev_type_group1 = {
1380 .name = MBOCHS_TYPE_1,
1381 .attrs = mdev_types_attrs,
1382};
1383
1384static struct attribute_group mdev_type_group2 = {
1385 .name = MBOCHS_TYPE_2,
1386 .attrs = mdev_types_attrs,
1387};
1388
1389static struct attribute_group mdev_type_group3 = {
1390 .name = MBOCHS_TYPE_3,
1391 .attrs = mdev_types_attrs,
1392};
1393
1394static struct attribute_group *mdev_type_groups[] = {
1395 &mdev_type_group1,
1396 &mdev_type_group2,
1397 &mdev_type_group3,
1398 NULL,
1399};
1400
1401static const struct vfio_device_ops mbochs_dev_ops = {
1402 .open = mbochs_open,
1403 .release = mbochs_close,
1404 .read = mbochs_read,
1405 .write = mbochs_write,
1406 .ioctl = mbochs_ioctl,
1407 .mmap = mbochs_mmap,
1408};
1409
1410static struct mdev_driver mbochs_driver = {
1411 .driver = {
1412 .name = "mbochs",
1413 .owner = THIS_MODULE,
1414 .mod_name = KBUILD_MODNAME,
1415 .dev_groups = mdev_dev_groups,
1416 },
1417 .probe = mbochs_probe,
1418 .remove = mbochs_remove,
1419};
1420
1421static const struct mdev_parent_ops mdev_fops = {
1422 .owner = THIS_MODULE,
1423 .device_driver = &mbochs_driver,
1424 .supported_type_groups = mdev_type_groups,
1425};
1426
1427static const struct file_operations vd_fops = {
1428 .owner = THIS_MODULE,
1429};
1430
1431static void mbochs_device_release(struct device *dev)
1432{
1433
1434}
1435
1436static int __init mbochs_dev_init(void)
1437{
1438 int ret = 0;
1439
1440 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
1441 if (ret < 0) {
1442 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
1443 return ret;
1444 }
1445 cdev_init(&mbochs_cdev, &vd_fops);
1446 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
1447 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
1448
1449 ret = mdev_register_driver(&mbochs_driver);
1450 if (ret)
1451 goto err_cdev;
1452
1453 mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
1454 if (IS_ERR(mbochs_class)) {
1455 pr_err("Error: failed to register mbochs_dev class\n");
1456 ret = PTR_ERR(mbochs_class);
1457 goto err_driver;
1458 }
1459 mbochs_dev.class = mbochs_class;
1460 mbochs_dev.release = mbochs_device_release;
1461 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME);
1462
1463 ret = device_register(&mbochs_dev);
1464 if (ret)
1465 goto err_class;
1466
1467 ret = mdev_register_device(&mbochs_dev, &mdev_fops);
1468 if (ret)
1469 goto err_device;
1470
1471 return 0;
1472
1473err_device:
1474 device_unregister(&mbochs_dev);
1475err_class:
1476 class_destroy(mbochs_class);
1477err_driver:
1478 mdev_unregister_driver(&mbochs_driver);
1479err_cdev:
1480 cdev_del(&mbochs_cdev);
1481 unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1482 return ret;
1483}
1484
1485static void __exit mbochs_dev_exit(void)
1486{
1487 mbochs_dev.bus = NULL;
1488 mdev_unregister_device(&mbochs_dev);
1489
1490 device_unregister(&mbochs_dev);
1491 mdev_unregister_driver(&mbochs_driver);
1492 cdev_del(&mbochs_cdev);
1493 unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1494 class_destroy(mbochs_class);
1495 mbochs_class = NULL;
1496}
1497
1498module_init(mbochs_dev_init)
1499module_exit(mbochs_dev_exit)
1500
