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 atomic_t mbochs_avail_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 int avail_mbytes = atomic_read(&mbochs_avail_mbytes);
511 const struct mbochs_type *type =
512 &mbochs_types[mdev_get_type_group_id(mdev)];
513 struct device *dev = mdev_dev(mdev);
514 struct mdev_state *mdev_state;
515 int ret = -ENOMEM;
516
517 do {
518 if (avail_mbytes < type->mbytes)
519 return -ENOSPC;
520 } while (!atomic_try_cmpxchg(&mbochs_avail_mbytes, &avail_mbytes,
521 avail_mbytes - type->mbytes));
522
523 mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
524 if (mdev_state == NULL)
525 goto err_avail;
526 vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mbochs_dev_ops);
527
528 mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
529 if (mdev_state->vconfig == NULL)
530 goto err_mem;
531
532 mdev_state->memsize = type->mbytes * 1024 * 1024;
533 mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT;
534 mdev_state->pages = kcalloc(mdev_state->pagecount,
535 sizeof(struct page *),
536 GFP_KERNEL);
537 if (!mdev_state->pages)
538 goto err_mem;
539
540 dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__,
541 type->name, type->mbytes, mdev_state->pagecount);
542
543 mutex_init(&mdev_state->ops_lock);
544 mdev_state->mdev = mdev;
545 INIT_LIST_HEAD(&mdev_state->dmabufs);
546 mdev_state->next_id = 1;
547
548 mdev_state->type = type;
549 mdev_state->edid_regs.max_xres = type->max_x;
550 mdev_state->edid_regs.max_yres = type->max_y;
551 mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET;
552 mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob);
553 mbochs_create_config_space(mdev_state);
554 mbochs_reset(mdev_state);
555
556 ret = vfio_register_group_dev(&mdev_state->vdev);
557 if (ret)
558 goto err_mem;
559 dev_set_drvdata(&mdev->dev, mdev_state);
560 return 0;
561err_mem:
562 vfio_uninit_group_dev(&mdev_state->vdev);
563 kfree(mdev_state->pages);
564 kfree(mdev_state->vconfig);
565 kfree(mdev_state);
566err_avail:
567 atomic_add(type->mbytes, &mbochs_avail_mbytes);
568 return ret;
569}
570
571static void mbochs_remove(struct mdev_device *mdev)
572{
573 struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
574
575 vfio_unregister_group_dev(&mdev_state->vdev);
576 vfio_uninit_group_dev(&mdev_state->vdev);
577 atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes);
578 kfree(mdev_state->pages);
579 kfree(mdev_state->vconfig);
580 kfree(mdev_state);
581}
582
583static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf,
584 size_t count, loff_t *ppos)
585{
586 struct mdev_state *mdev_state =
587 container_of(vdev, struct mdev_state, vdev);
588 unsigned int done = 0;
589 int ret;
590
591 while (count) {
592 size_t filled;
593
594 if (count >= 4 && !(*ppos % 4)) {
595 u32 val;
596
597 ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
598 *ppos, false);
599 if (ret <= 0)
600 goto read_err;
601
602 if (copy_to_user(buf, &val, sizeof(val)))
603 goto read_err;
604
605 filled = 4;
606 } else if (count >= 2 && !(*ppos % 2)) {
607 u16 val;
608
609 ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
610 *ppos, false);
611 if (ret <= 0)
612 goto read_err;
613
614 if (copy_to_user(buf, &val, sizeof(val)))
615 goto read_err;
616
617 filled = 2;
618 } else {
619 u8 val;
620
621 ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
622 *ppos, false);
623 if (ret <= 0)
624 goto read_err;
625
626 if (copy_to_user(buf, &val, sizeof(val)))
627 goto read_err;
628
629 filled = 1;
630 }
631
632 count -= filled;
633 done += filled;
634 *ppos += filled;
635 buf += filled;
636 }
637
638 return done;
639
640read_err:
641 return -EFAULT;
642}
643
644static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf,
645 size_t count, loff_t *ppos)
646{
647 struct mdev_state *mdev_state =
648 container_of(vdev, struct mdev_state, vdev);
649 unsigned int done = 0;
650 int ret;
651
652 while (count) {
653 size_t filled;
654
655 if (count >= 4 && !(*ppos % 4)) {
656 u32 val;
657
658 if (copy_from_user(&val, buf, sizeof(val)))
659 goto write_err;
660
661 ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
662 *ppos, true);
663 if (ret <= 0)
664 goto write_err;
665
666 filled = 4;
667 } else if (count >= 2 && !(*ppos % 2)) {
668 u16 val;
669
670 if (copy_from_user(&val, buf, sizeof(val)))
671 goto write_err;
672
673 ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
674 *ppos, true);
675 if (ret <= 0)
676 goto write_err;
677
678 filled = 2;
679 } else {
680 u8 val;
681
682 if (copy_from_user(&val, buf, sizeof(val)))
683 goto write_err;
684
685 ret = mdev_access(mdev_state, (char *)&val, sizeof(val),
686 *ppos, true);
687 if (ret <= 0)
688 goto write_err;
689
690 filled = 1;
691 }
692 count -= filled;
693 done += filled;
694 *ppos += filled;
695 buf += filled;
696 }
697
698 return done;
699write_err:
700 return -EFAULT;
701}
702
703static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
704 pgoff_t pgoff)
705{
706 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
707
708 if (!mdev_state->pages[pgoff]) {
709 mdev_state->pages[pgoff] =
710 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0);
711 if (!mdev_state->pages[pgoff])
712 return NULL;
713 }
714
715 get_page(mdev_state->pages[pgoff]);
716 return mdev_state->pages[pgoff];
717}
718
719static struct page *mbochs_get_page(struct mdev_state *mdev_state,
720 pgoff_t pgoff)
721{
722 struct page *page;
723
724 if (WARN_ON(pgoff >= mdev_state->pagecount))
725 return NULL;
726
727 mutex_lock(&mdev_state->ops_lock);
728 page = __mbochs_get_page(mdev_state, pgoff);
729 mutex_unlock(&mdev_state->ops_lock);
730
731 return page;
732}
733
734static void mbochs_put_pages(struct mdev_state *mdev_state)
735{
736 struct device *dev = mdev_dev(mdev_state->mdev);
737 int i, count = 0;
738
739 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
740
741 for (i = 0; i < mdev_state->pagecount; i++) {
742 if (!mdev_state->pages[i])
743 continue;
744 put_page(mdev_state->pages[i]);
745 mdev_state->pages[i] = NULL;
746 count++;
747 }
748 dev_dbg(dev, "%s: %d pages released\n", __func__, count);
749}
750
751static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf)
752{
753 struct vm_area_struct *vma = vmf->vma;
754 struct mdev_state *mdev_state = vma->vm_private_data;
755 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
756
757 if (page_offset >= mdev_state->pagecount)
758 return VM_FAULT_SIGBUS;
759
760 vmf->page = mbochs_get_page(mdev_state, page_offset);
761 if (!vmf->page)
762 return VM_FAULT_SIGBUS;
763
764 return 0;
765}
766
767static const struct vm_operations_struct mbochs_region_vm_ops = {
768 .fault = mbochs_region_vm_fault,
769};
770
771static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma)
772{
773 struct mdev_state *mdev_state =
774 container_of(vdev, struct mdev_state, vdev);
775
776 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
777 return -EINVAL;
778 if (vma->vm_end < vma->vm_start)
779 return -EINVAL;
780 if (vma->vm_end - vma->vm_start > mdev_state->memsize)
781 return -EINVAL;
782 if ((vma->vm_flags & VM_SHARED) == 0)
783 return -EINVAL;
784
785 vma->vm_ops = &mbochs_region_vm_ops;
786 vma->vm_private_data = mdev_state;
787 return 0;
788}
789
790static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf)
791{
792 struct vm_area_struct *vma = vmf->vma;
793 struct mbochs_dmabuf *dmabuf = vma->vm_private_data;
794
795 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount))
796 return VM_FAULT_SIGBUS;
797
798 vmf->page = dmabuf->pages[vmf->pgoff];
799 get_page(vmf->page);
800 return 0;
801}
802
803static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
804 .fault = mbochs_dmabuf_vm_fault,
805};
806
807static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
808{
809 struct mbochs_dmabuf *dmabuf = buf->priv;
810 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
811
812 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
813
814 if ((vma->vm_flags & VM_SHARED) == 0)
815 return -EINVAL;
816
817 vma->vm_ops = &mbochs_dmabuf_vm_ops;
818 vma->vm_private_data = dmabuf;
819 return 0;
820}
821
822static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf,
823 const char *prefix)
824{
825 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
826 u32 fourcc = dmabuf->mode.drm_format;
827
828 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n",
829 prefix, dmabuf->id,
830 fourcc ? ((fourcc >> 0) & 0xff) : '-',
831 fourcc ? ((fourcc >> 8) & 0xff) : '-',
832 fourcc ? ((fourcc >> 16) & 0xff) : '-',
833 fourcc ? ((fourcc >> 24) & 0xff) : '-',
834 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride,
835 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount);
836}
837
838static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at,
839 enum dma_data_direction direction)
840{
841 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
842 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
843 struct sg_table *sg;
844
845 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
846
847 sg = kzalloc(sizeof(*sg), GFP_KERNEL);
848 if (!sg)
849 goto err1;
850 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount,
851 0, dmabuf->mode.size, GFP_KERNEL) < 0)
852 goto err2;
853 if (dma_map_sgtable(at->dev, sg, direction, 0))
854 goto err3;
855
856 return sg;
857
858err3:
859 sg_free_table(sg);
860err2:
861 kfree(sg);
862err1:
863 return ERR_PTR(-ENOMEM);
864}
865
866static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at,
867 struct sg_table *sg,
868 enum dma_data_direction direction)
869{
870 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
871 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
872
873 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
874
875 dma_unmap_sgtable(at->dev, sg, direction, 0);
876 sg_free_table(sg);
877 kfree(sg);
878}
879
880static void mbochs_release_dmabuf(struct dma_buf *buf)
881{
882 struct mbochs_dmabuf *dmabuf = buf->priv;
883 struct mdev_state *mdev_state = dmabuf->mdev_state;
884 struct device *dev = mdev_dev(mdev_state->mdev);
885 pgoff_t pg;
886
887 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
888
889 for (pg = 0; pg < dmabuf->pagecount; pg++)
890 put_page(dmabuf->pages[pg]);
891
892 mutex_lock(&mdev_state->ops_lock);
893 dmabuf->buf = NULL;
894 if (dmabuf->unlinked)
895 kfree(dmabuf);
896 mutex_unlock(&mdev_state->ops_lock);
897}
898
899static struct dma_buf_ops mbochs_dmabuf_ops = {
900 .map_dma_buf = mbochs_map_dmabuf,
901 .unmap_dma_buf = mbochs_unmap_dmabuf,
902 .release = mbochs_release_dmabuf,
903 .mmap = mbochs_mmap_dmabuf,
904};
905
906static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state,
907 struct mbochs_mode *mode)
908{
909 struct mbochs_dmabuf *dmabuf;
910 pgoff_t page_offset, pg;
911
912 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
913
914 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL);
915 if (!dmabuf)
916 return NULL;
917
918 dmabuf->mode = *mode;
919 dmabuf->id = mdev_state->next_id++;
920 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE);
921 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *),
922 GFP_KERNEL);
923 if (!dmabuf->pages)
924 goto err_free_dmabuf;
925
926 page_offset = dmabuf->mode.offset >> PAGE_SHIFT;
927 for (pg = 0; pg < dmabuf->pagecount; pg++) {
928 dmabuf->pages[pg] = __mbochs_get_page(mdev_state,
929 page_offset + pg);
930 if (!dmabuf->pages[pg])
931 goto err_free_pages;
932 }
933
934 dmabuf->mdev_state = mdev_state;
935 list_add(&dmabuf->next, &mdev_state->dmabufs);
936
937 mbochs_print_dmabuf(dmabuf, __func__);
938 return dmabuf;
939
940err_free_pages:
941 while (pg > 0)
942 put_page(dmabuf->pages[--pg]);
943 kfree(dmabuf->pages);
944err_free_dmabuf:
945 kfree(dmabuf);
946 return NULL;
947}
948
949static struct mbochs_dmabuf *
950mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state,
951 struct mbochs_mode *mode)
952{
953 struct mbochs_dmabuf *dmabuf;
954
955 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
956
957 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
958 if (mbochs_modes_equal(&dmabuf->mode, mode))
959 return dmabuf;
960
961 return NULL;
962}
963
964static struct mbochs_dmabuf *
965mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
966{
967 struct mbochs_dmabuf *dmabuf;
968
969 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
970
971 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
972 if (dmabuf->id == id)
973 return dmabuf;
974
975 return NULL;
976}
977
978static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
979{
980 struct mdev_state *mdev_state = dmabuf->mdev_state;
981 struct device *dev = mdev_state->vdev.dev;
982 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
983 struct dma_buf *buf;
984
985 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
986
987 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) {
988 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n",
989 __func__);
990 return -EINVAL;
991 }
992
993 exp_info.ops = &mbochs_dmabuf_ops;
994 exp_info.size = dmabuf->mode.size;
995 exp_info.priv = dmabuf;
996
997 buf = dma_buf_export(&exp_info);
998 if (IS_ERR(buf)) {
999 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n",
1000 __func__, PTR_ERR(buf));
1001 return PTR_ERR(buf);
1002 }
1003
1004 dmabuf->buf = buf;
1005 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
1006 return 0;
1007}
1008
1009static int mbochs_get_region_info(struct mdev_state *mdev_state,
1010 struct vfio_region_info_ext *ext)
1011{
1012 struct vfio_region_info *region_info = &ext->base;
1013
1014 if (region_info->index >= MBOCHS_NUM_REGIONS)
1015 return -EINVAL;
1016
1017 switch (region_info->index) {
1018 case VFIO_PCI_CONFIG_REGION_INDEX:
1019 region_info->offset = 0;
1020 region_info->size = MBOCHS_CONFIG_SPACE_SIZE;
1021 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1022 VFIO_REGION_INFO_FLAG_WRITE);
1023 break;
1024 case VFIO_PCI_BAR0_REGION_INDEX:
1025 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET;
1026 region_info->size = mdev_state->memsize;
1027 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1028 VFIO_REGION_INFO_FLAG_WRITE |
1029 VFIO_REGION_INFO_FLAG_MMAP);
1030 break;
1031 case VFIO_PCI_BAR2_REGION_INDEX:
1032 region_info->offset = MBOCHS_MMIO_BAR_OFFSET;
1033 region_info->size = MBOCHS_MMIO_BAR_SIZE;
1034 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1035 VFIO_REGION_INFO_FLAG_WRITE);
1036 break;
1037 case MBOCHS_EDID_REGION_INDEX:
1038 ext->base.argsz = sizeof(*ext);
1039 ext->base.offset = MBOCHS_EDID_OFFSET;
1040 ext->base.size = MBOCHS_EDID_SIZE;
1041 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ |
1042 VFIO_REGION_INFO_FLAG_WRITE |
1043 VFIO_REGION_INFO_FLAG_CAPS);
1044 ext->base.cap_offset = offsetof(typeof(*ext), type);
1045 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE;
1046 ext->type.header.version = 1;
1047 ext->type.header.next = 0;
1048 ext->type.type = VFIO_REGION_TYPE_GFX;
1049 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID;
1050 break;
1051 default:
1052 region_info->size = 0;
1053 region_info->offset = 0;
1054 region_info->flags = 0;
1055 }
1056
1057 return 0;
1058}
1059
1060static int mbochs_get_irq_info(struct vfio_irq_info *irq_info)
1061{
1062 irq_info->count = 0;
1063 return 0;
1064}
1065
1066static int mbochs_get_device_info(struct vfio_device_info *dev_info)
1067{
1068 dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
1069 dev_info->num_regions = MBOCHS_NUM_REGIONS;
1070 dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
1071 return 0;
1072}
1073
1074static int mbochs_query_gfx_plane(struct mdev_state *mdev_state,
1075 struct vfio_device_gfx_plane_info *plane)
1076{
1077 struct mbochs_dmabuf *dmabuf;
1078 struct mbochs_mode mode;
1079 int ret;
1080
1081 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
1082 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
1083 VFIO_GFX_PLANE_TYPE_DMABUF))
1084 return 0;
1085 return -EINVAL;
1086 }
1087
1088 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF)
1089 return -EINVAL;
1090
1091 plane->drm_format_mod = 0;
1092 plane->x_pos = 0;
1093 plane->y_pos = 0;
1094 plane->x_hot = 0;
1095 plane->y_hot = 0;
1096
1097 mutex_lock(&mdev_state->ops_lock);
1098
1099 ret = -EINVAL;
1100 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY)
1101 ret = mbochs_check_framebuffer(mdev_state, &mode);
1102 if (ret < 0) {
1103 plane->drm_format = 0;
1104 plane->width = 0;
1105 plane->height = 0;
1106 plane->stride = 0;
1107 plane->size = 0;
1108 plane->dmabuf_id = 0;
1109 goto done;
1110 }
1111
1112 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode);
1113 if (!dmabuf)
1114 mbochs_dmabuf_alloc(mdev_state, &mode);
1115 if (!dmabuf) {
1116 mutex_unlock(&mdev_state->ops_lock);
1117 return -ENOMEM;
1118 }
1119
1120 plane->drm_format = dmabuf->mode.drm_format;
1121 plane->width = dmabuf->mode.width;
1122 plane->height = dmabuf->mode.height;
1123 plane->stride = dmabuf->mode.stride;
1124 plane->size = dmabuf->mode.size;
1125 plane->dmabuf_id = dmabuf->id;
1126
1127done:
1128 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY &&
1129 mdev_state->active_id != plane->dmabuf_id) {
1130 dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n",
1131 __func__, mdev_state->active_id, plane->dmabuf_id);
1132 mdev_state->active_id = plane->dmabuf_id;
1133 }
1134 mutex_unlock(&mdev_state->ops_lock);
1135 return 0;
1136}
1137
1138static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id)
1139{
1140 struct mbochs_dmabuf *dmabuf;
1141
1142 mutex_lock(&mdev_state->ops_lock);
1143
1144 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id);
1145 if (!dmabuf) {
1146 mutex_unlock(&mdev_state->ops_lock);
1147 return -ENOENT;
1148 }
1149
1150 if (!dmabuf->buf)
1151 mbochs_dmabuf_export(dmabuf);
1152
1153 mutex_unlock(&mdev_state->ops_lock);
1154
1155 if (!dmabuf->buf)
1156 return -EINVAL;
1157
1158 return dma_buf_fd(dmabuf->buf, 0);
1159}
1160
1161static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd,
1162 unsigned long arg)
1163{
1164 struct mdev_state *mdev_state =
1165 container_of(vdev, struct mdev_state, vdev);
1166 int ret = 0;
1167 unsigned long minsz, outsz;
1168
1169 switch (cmd) {
1170 case VFIO_DEVICE_GET_INFO:
1171 {
1172 struct vfio_device_info info;
1173
1174 minsz = offsetofend(struct vfio_device_info, num_irqs);
1175
1176 if (copy_from_user(&info, (void __user *)arg, minsz))
1177 return -EFAULT;
1178
1179 if (info.argsz < minsz)
1180 return -EINVAL;
1181
1182 ret = mbochs_get_device_info(&info);
1183 if (ret)
1184 return ret;
1185
1186 if (copy_to_user((void __user *)arg, &info, minsz))
1187 return -EFAULT;
1188
1189 return 0;
1190 }
1191 case VFIO_DEVICE_GET_REGION_INFO:
1192 {
1193 struct vfio_region_info_ext info;
1194
1195 minsz = offsetofend(typeof(info), base.offset);
1196
1197 if (copy_from_user(&info, (void __user *)arg, minsz))
1198 return -EFAULT;
1199
1200 outsz = info.base.argsz;
1201 if (outsz < minsz)
1202 return -EINVAL;
1203 if (outsz > sizeof(info))
1204 return -EINVAL;
1205
1206 ret = mbochs_get_region_info(mdev_state, &info);
1207 if (ret)
1208 return ret;
1209
1210 if (copy_to_user((void __user *)arg, &info, outsz))
1211 return -EFAULT;
1212
1213 return 0;
1214 }
1215
1216 case VFIO_DEVICE_GET_IRQ_INFO:
1217 {
1218 struct vfio_irq_info info;
1219
1220 minsz = offsetofend(struct vfio_irq_info, count);
1221
1222 if (copy_from_user(&info, (void __user *)arg, minsz))
1223 return -EFAULT;
1224
1225 if ((info.argsz < minsz) ||
1226 (info.index >= VFIO_PCI_NUM_IRQS))
1227 return -EINVAL;
1228
1229 ret = mbochs_get_irq_info(&info);
1230 if (ret)
1231 return ret;
1232
1233 if (copy_to_user((void __user *)arg, &info, minsz))
1234 return -EFAULT;
1235
1236 return 0;
1237 }
1238
1239 case VFIO_DEVICE_QUERY_GFX_PLANE:
1240 {
1241 struct vfio_device_gfx_plane_info plane;
1242
1243 minsz = offsetofend(struct vfio_device_gfx_plane_info,
1244 region_index);
1245
1246 if (copy_from_user(&plane, (void __user *)arg, minsz))
1247 return -EFAULT;
1248
1249 if (plane.argsz < minsz)
1250 return -EINVAL;
1251
1252 ret = mbochs_query_gfx_plane(mdev_state, &plane);
1253 if (ret)
1254 return ret;
1255
1256 if (copy_to_user((void __user *)arg, &plane, minsz))
1257 return -EFAULT;
1258
1259 return 0;
1260 }
1261
1262 case VFIO_DEVICE_GET_GFX_DMABUF:
1263 {
1264 u32 dmabuf_id;
1265
1266 if (get_user(dmabuf_id, (__u32 __user *)arg))
1267 return -EFAULT;
1268
1269 return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id);
1270 }
1271
1272 case VFIO_DEVICE_SET_IRQS:
1273 return -EINVAL;
1274
1275 case VFIO_DEVICE_RESET:
1276 return mbochs_reset(mdev_state);
1277 }
1278 return -ENOTTY;
1279}
1280
1281static void mbochs_close_device(struct vfio_device *vdev)
1282{
1283 struct mdev_state *mdev_state =
1284 container_of(vdev, struct mdev_state, vdev);
1285 struct mbochs_dmabuf *dmabuf, *tmp;
1286
1287 mutex_lock(&mdev_state->ops_lock);
1288
1289 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) {
1290 list_del(&dmabuf->next);
1291 if (dmabuf->buf) {
1292
1293 dmabuf->unlinked = true;
1294 } else {
1295 kfree(dmabuf);
1296 }
1297 }
1298 mbochs_put_pages(mdev_state);
1299
1300 mutex_unlock(&mdev_state->ops_lock);
1301}
1302
1303static ssize_t
1304memory_show(struct device *dev, struct device_attribute *attr,
1305 char *buf)
1306{
1307 struct mdev_state *mdev_state = dev_get_drvdata(dev);
1308
1309 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes);
1310}
1311static DEVICE_ATTR_RO(memory);
1312
1313static struct attribute *mdev_dev_attrs[] = {
1314 &dev_attr_memory.attr,
1315 NULL,
1316};
1317
1318static const struct attribute_group mdev_dev_group = {
1319 .name = "vendor",
1320 .attrs = mdev_dev_attrs,
1321};
1322
1323static const struct attribute_group *mdev_dev_groups[] = {
1324 &mdev_dev_group,
1325 NULL,
1326};
1327
1328static ssize_t name_show(struct mdev_type *mtype,
1329 struct mdev_type_attribute *attr, char *buf)
1330{
1331 const struct mbochs_type *type =
1332 &mbochs_types[mtype_get_type_group_id(mtype)];
1333
1334 return sprintf(buf, "%s\n", type->name);
1335}
1336static MDEV_TYPE_ATTR_RO(name);
1337
1338static ssize_t description_show(struct mdev_type *mtype,
1339 struct mdev_type_attribute *attr, char *buf)
1340{
1341 const struct mbochs_type *type =
1342 &mbochs_types[mtype_get_type_group_id(mtype)];
1343
1344 return sprintf(buf, "virtual display, %d MB video memory\n",
1345 type ? type->mbytes : 0);
1346}
1347static MDEV_TYPE_ATTR_RO(description);
1348
1349static ssize_t available_instances_show(struct mdev_type *mtype,
1350 struct mdev_type_attribute *attr,
1351 char *buf)
1352{
1353 const struct mbochs_type *type =
1354 &mbochs_types[mtype_get_type_group_id(mtype)];
1355 int count = atomic_read(&mbochs_avail_mbytes) / type->mbytes;
1356
1357 return sprintf(buf, "%d\n", count);
1358}
1359static MDEV_TYPE_ATTR_RO(available_instances);
1360
1361static ssize_t device_api_show(struct mdev_type *mtype,
1362 struct mdev_type_attribute *attr, char *buf)
1363{
1364 return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
1365}
1366static MDEV_TYPE_ATTR_RO(device_api);
1367
1368static struct attribute *mdev_types_attrs[] = {
1369 &mdev_type_attr_name.attr,
1370 &mdev_type_attr_description.attr,
1371 &mdev_type_attr_device_api.attr,
1372 &mdev_type_attr_available_instances.attr,
1373 NULL,
1374};
1375
1376static struct attribute_group mdev_type_group1 = {
1377 .name = MBOCHS_TYPE_1,
1378 .attrs = mdev_types_attrs,
1379};
1380
1381static struct attribute_group mdev_type_group2 = {
1382 .name = MBOCHS_TYPE_2,
1383 .attrs = mdev_types_attrs,
1384};
1385
1386static struct attribute_group mdev_type_group3 = {
1387 .name = MBOCHS_TYPE_3,
1388 .attrs = mdev_types_attrs,
1389};
1390
1391static struct attribute_group *mdev_type_groups[] = {
1392 &mdev_type_group1,
1393 &mdev_type_group2,
1394 &mdev_type_group3,
1395 NULL,
1396};
1397
1398static const struct vfio_device_ops mbochs_dev_ops = {
1399 .close_device = mbochs_close_device,
1400 .read = mbochs_read,
1401 .write = mbochs_write,
1402 .ioctl = mbochs_ioctl,
1403 .mmap = mbochs_mmap,
1404};
1405
1406static struct mdev_driver mbochs_driver = {
1407 .driver = {
1408 .name = "mbochs",
1409 .owner = THIS_MODULE,
1410 .mod_name = KBUILD_MODNAME,
1411 .dev_groups = mdev_dev_groups,
1412 },
1413 .probe = mbochs_probe,
1414 .remove = mbochs_remove,
1415};
1416
1417static const struct mdev_parent_ops mdev_fops = {
1418 .owner = THIS_MODULE,
1419 .device_driver = &mbochs_driver,
1420 .supported_type_groups = mdev_type_groups,
1421};
1422
1423static const struct file_operations vd_fops = {
1424 .owner = THIS_MODULE,
1425};
1426
1427static void mbochs_device_release(struct device *dev)
1428{
1429
1430}
1431
1432static int __init mbochs_dev_init(void)
1433{
1434 int ret = 0;
1435
1436 atomic_set(&mbochs_avail_mbytes, max_mbytes);
1437
1438 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
1439 if (ret < 0) {
1440 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
1441 return ret;
1442 }
1443 cdev_init(&mbochs_cdev, &vd_fops);
1444 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
1445 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
1446
1447 ret = mdev_register_driver(&mbochs_driver);
1448 if (ret)
1449 goto err_cdev;
1450
1451 mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
1452 if (IS_ERR(mbochs_class)) {
1453 pr_err("Error: failed to register mbochs_dev class\n");
1454 ret = PTR_ERR(mbochs_class);
1455 goto err_driver;
1456 }
1457 mbochs_dev.class = mbochs_class;
1458 mbochs_dev.release = mbochs_device_release;
1459 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME);
1460
1461 ret = device_register(&mbochs_dev);
1462 if (ret)
1463 goto err_class;
1464
1465 ret = mdev_register_device(&mbochs_dev, &mdev_fops);
1466 if (ret)
1467 goto err_device;
1468
1469 return 0;
1470
1471err_device:
1472 device_unregister(&mbochs_dev);
1473err_class:
1474 class_destroy(mbochs_class);
1475err_driver:
1476 mdev_unregister_driver(&mbochs_driver);
1477err_cdev:
1478 cdev_del(&mbochs_cdev);
1479 unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1480 return ret;
1481}
1482
1483static void __exit mbochs_dev_exit(void)
1484{
1485 mbochs_dev.bus = NULL;
1486 mdev_unregister_device(&mbochs_dev);
1487
1488 device_unregister(&mbochs_dev);
1489 mdev_unregister_driver(&mbochs_driver);
1490 cdev_del(&mbochs_cdev);
1491 unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1492 class_destroy(mbochs_class);
1493 mbochs_class = NULL;
1494}
1495
1496module_init(mbochs_dev_init)
1497module_exit(mbochs_dev_exit)
1498
