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Merge tag 'scmi-fixes-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep...
[mirror_ubuntu-hirsute-kernel.git] / samples / vfio-mdev / mbochs.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Mediated virtual PCI display host device driver
4 *
5 * Emulate enough of qemu stdvga to make bochs-drm.ko happy. That is
6 * basically the vram memory bar and the bochs dispi interface vbe
7 * registers in the mmio register bar. Specifically it does *not*
8 * include any legacy vga stuff. Device looks a lot like "qemu -device
9 * secondary-vga".
10 *
11 * (c) Gerd Hoffmann <kraxel@redhat.com>
12 *
13 * based on mtty driver which is:
14 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
15 * Author: Neo Jia <cjia@nvidia.com>
16 * Kirti Wankhede <kwankhede@nvidia.com>
17 *
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License version 2 as
20 * published by the Free Software Foundation.
21 */
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/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
92 MODULE_LICENSE("GPL v2");
93
94 static int max_mbytes = 256;
95 module_param_named(count, max_mbytes, int, 0444);
96 MODULE_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
103 static 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
128 static dev_t mbochs_devt;
129 static struct class *mbochs_class;
130 static struct cdev mbochs_cdev;
131 static struct device mbochs_dev;
132 static int mbochs_used_mbytes;
133
134 struct vfio_region_info_ext {
135 struct vfio_region_info base;
136 struct vfio_region_info_cap_type type;
137 };
138
139 struct mbochs_mode {
140 u32 drm_format;
141 u32 bytepp;
142 u32 width;
143 u32 height;
144 u32 stride;
145 u32 __pad;
146 u64 offset;
147 u64 size;
148 };
149
150 struct mbochs_dmabuf {
151 struct mbochs_mode mode;
152 u32 id;
153 struct page **pages;
154 pgoff_t pagecount;
155 struct dma_buf *buf;
156 struct mdev_state *mdev_state;
157 struct list_head next;
158 bool unlinked;
159 };
160
161 /* State of each mdev device */
162 struct mdev_state {
163 u8 *vconfig;
164 u64 bar_mask[3];
165 u32 memory_bar_mask;
166 struct mutex ops_lock;
167 struct mdev_device *mdev;
168
169 const struct mbochs_type *type;
170 u16 vbe[VBE_DISPI_INDEX_COUNT];
171 u64 memsize;
172 struct page **pages;
173 pgoff_t pagecount;
174 struct vfio_region_gfx_edid edid_regs;
175 u8 edid_blob[0x400];
176
177 struct list_head dmabufs;
178 u32 active_id;
179 u32 next_id;
180 };
181
182 static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = {
183 [VBE_DISPI_INDEX_ID] = "id",
184 [VBE_DISPI_INDEX_XRES] = "xres",
185 [VBE_DISPI_INDEX_YRES] = "yres",
186 [VBE_DISPI_INDEX_BPP] = "bpp",
187 [VBE_DISPI_INDEX_ENABLE] = "enable",
188 [VBE_DISPI_INDEX_BANK] = "bank",
189 [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width",
190 [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height",
191 [VBE_DISPI_INDEX_X_OFFSET] = "x-offset",
192 [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset",
193 [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem",
194 };
195
196 static const char *vbe_name(u32 index)
197 {
198 if (index < ARRAY_SIZE(vbe_name_list))
199 return vbe_name_list[index];
200 return "(invalid)";
201 }
202
203 static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
204 pgoff_t pgoff);
205 static struct page *mbochs_get_page(struct mdev_state *mdev_state,
206 pgoff_t pgoff);
207
208 static const struct mbochs_type *mbochs_find_type(struct kobject *kobj)
209 {
210 int i;
211
212 for (i = 0; i < ARRAY_SIZE(mbochs_types); i++)
213 if (strcmp(mbochs_types[i].name, kobj->name) == 0)
214 return mbochs_types + i;
215 return NULL;
216 }
217
218 static void mbochs_create_config_space(struct mdev_state *mdev_state)
219 {
220 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID],
221 0x1234);
222 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID],
223 0x1111);
224 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID],
225 PCI_SUBVENDOR_ID_REDHAT_QUMRANET);
226 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID],
227 PCI_SUBDEVICE_ID_QEMU);
228
229 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND],
230 PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
231 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE],
232 PCI_CLASS_DISPLAY_OTHER);
233 mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01;
234
235 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0],
236 PCI_BASE_ADDRESS_SPACE_MEMORY |
237 PCI_BASE_ADDRESS_MEM_TYPE_32 |
238 PCI_BASE_ADDRESS_MEM_PREFETCH);
239 mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1;
240
241 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2],
242 PCI_BASE_ADDRESS_SPACE_MEMORY |
243 PCI_BASE_ADDRESS_MEM_TYPE_32);
244 mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1;
245 }
246
247 static int mbochs_check_framebuffer(struct mdev_state *mdev_state,
248 struct mbochs_mode *mode)
249 {
250 struct device *dev = mdev_dev(mdev_state->mdev);
251 u16 *vbe = mdev_state->vbe;
252 u32 virt_width;
253
254 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
255
256 if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED))
257 goto nofb;
258
259 memset(mode, 0, sizeof(*mode));
260 switch (vbe[VBE_DISPI_INDEX_BPP]) {
261 case 32:
262 mode->drm_format = DRM_FORMAT_XRGB8888;
263 mode->bytepp = 4;
264 break;
265 default:
266 dev_info_ratelimited(dev, "%s: bpp %d not supported\n",
267 __func__, vbe[VBE_DISPI_INDEX_BPP]);
268 goto nofb;
269 }
270
271 mode->width = vbe[VBE_DISPI_INDEX_XRES];
272 mode->height = vbe[VBE_DISPI_INDEX_YRES];
273 virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH];
274 if (virt_width < mode->width)
275 virt_width = mode->width;
276 mode->stride = virt_width * mode->bytepp;
277 mode->size = (u64)mode->stride * mode->height;
278 mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp +
279 (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride);
280
281 if (mode->width < 64 || mode->height < 64) {
282 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n",
283 __func__, mode->width, mode->height);
284 goto nofb;
285 }
286 if (mode->offset + mode->size > mdev_state->memsize) {
287 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n",
288 __func__);
289 goto nofb;
290 }
291
292 return 0;
293
294 nofb:
295 memset(mode, 0, sizeof(*mode));
296 return -EINVAL;
297 }
298
299 static bool mbochs_modes_equal(struct mbochs_mode *mode1,
300 struct mbochs_mode *mode2)
301 {
302 return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0;
303 }
304
305 static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
306 char *buf, u32 count)
307 {
308 struct device *dev = mdev_dev(mdev_state->mdev);
309 int index = (offset - PCI_BASE_ADDRESS_0) / 0x04;
310 u32 cfg_addr;
311
312 switch (offset) {
313 case PCI_BASE_ADDRESS_0:
314 case PCI_BASE_ADDRESS_2:
315 cfg_addr = *(u32 *)buf;
316
317 if (cfg_addr == 0xffffffff) {
318 cfg_addr = (cfg_addr & mdev_state->bar_mask[index]);
319 } else {
320 cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK;
321 if (cfg_addr)
322 dev_info(dev, "BAR #%d @ 0x%x\n",
323 index, cfg_addr);
324 }
325
326 cfg_addr |= (mdev_state->vconfig[offset] &
327 ~PCI_BASE_ADDRESS_MEM_MASK);
328 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr);
329 break;
330 }
331 }
332
333 static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset,
334 char *buf, u32 count)
335 {
336 struct device *dev = mdev_dev(mdev_state->mdev);
337 int index;
338 u16 reg16;
339
340 switch (offset) {
341 case 0x400 ... 0x41f: /* vga ioports remapped */
342 goto unhandled;
343 case 0x500 ... 0x515: /* bochs dispi interface */
344 if (count != 2)
345 goto unhandled;
346 index = (offset - 0x500) / 2;
347 reg16 = *(u16 *)buf;
348 if (index < ARRAY_SIZE(mdev_state->vbe))
349 mdev_state->vbe[index] = reg16;
350 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n",
351 __func__, index, reg16, vbe_name(index));
352 break;
353 case 0x600 ... 0x607: /* qemu extended regs */
354 goto unhandled;
355 default:
356 unhandled:
357 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
358 __func__, offset, count);
359 break;
360 }
361 }
362
363 static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset,
364 char *buf, u32 count)
365 {
366 struct device *dev = mdev_dev(mdev_state->mdev);
367 struct vfio_region_gfx_edid *edid;
368 u16 reg16 = 0;
369 int index;
370
371 switch (offset) {
372 case 0x000 ... 0x3ff: /* edid block */
373 edid = &mdev_state->edid_regs;
374 if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP ||
375 offset >= edid->edid_size) {
376 memset(buf, 0, count);
377 break;
378 }
379 memcpy(buf, mdev_state->edid_blob + offset, count);
380 break;
381 case 0x500 ... 0x515: /* bochs dispi interface */
382 if (count != 2)
383 goto unhandled;
384 index = (offset - 0x500) / 2;
385 if (index < ARRAY_SIZE(mdev_state->vbe))
386 reg16 = mdev_state->vbe[index];
387 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n",
388 __func__, index, reg16, vbe_name(index));
389 *(u16 *)buf = reg16;
390 break;
391 default:
392 unhandled:
393 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
394 __func__, offset, count);
395 memset(buf, 0, count);
396 break;
397 }
398 }
399
400 static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset,
401 char *buf, u32 count, bool is_write)
402 {
403 char *regs = (void *)&mdev_state->edid_regs;
404
405 if (offset + count > sizeof(mdev_state->edid_regs))
406 return;
407 if (count != 4)
408 return;
409 if (offset % 4)
410 return;
411
412 if (is_write) {
413 switch (offset) {
414 case offsetof(struct vfio_region_gfx_edid, link_state):
415 case offsetof(struct vfio_region_gfx_edid, edid_size):
416 memcpy(regs + offset, buf, count);
417 break;
418 default:
419 /* read-only regs */
420 break;
421 }
422 } else {
423 memcpy(buf, regs + offset, count);
424 }
425 }
426
427 static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset,
428 char *buf, u32 count, bool is_write)
429 {
430 if (offset + count > mdev_state->edid_regs.edid_max_size)
431 return;
432 if (is_write)
433 memcpy(mdev_state->edid_blob + offset, buf, count);
434 else
435 memcpy(buf, mdev_state->edid_blob + offset, count);
436 }
437
438 static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
439 loff_t pos, bool is_write)
440 {
441 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
442 struct device *dev = mdev_dev(mdev);
443 struct page *pg;
444 loff_t poff;
445 char *map;
446 int ret = 0;
447
448 mutex_lock(&mdev_state->ops_lock);
449
450 if (pos < MBOCHS_CONFIG_SPACE_SIZE) {
451 if (is_write)
452 handle_pci_cfg_write(mdev_state, pos, buf, count);
453 else
454 memcpy(buf, (mdev_state->vconfig + pos), count);
455
456 } else if (pos >= MBOCHS_MMIO_BAR_OFFSET &&
457 pos + count <= (MBOCHS_MMIO_BAR_OFFSET +
458 MBOCHS_MMIO_BAR_SIZE)) {
459 pos -= MBOCHS_MMIO_BAR_OFFSET;
460 if (is_write)
461 handle_mmio_write(mdev_state, pos, buf, count);
462 else
463 handle_mmio_read(mdev_state, pos, buf, count);
464
465 } else if (pos >= MBOCHS_EDID_OFFSET &&
466 pos + count <= (MBOCHS_EDID_OFFSET +
467 MBOCHS_EDID_SIZE)) {
468 pos -= MBOCHS_EDID_OFFSET;
469 if (pos < MBOCHS_EDID_BLOB_OFFSET) {
470 handle_edid_regs(mdev_state, pos, buf, count, is_write);
471 } else {
472 pos -= MBOCHS_EDID_BLOB_OFFSET;
473 handle_edid_blob(mdev_state, pos, buf, count, is_write);
474 }
475
476 } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET &&
477 pos + count <=
478 MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) {
479 pos -= MBOCHS_MMIO_BAR_OFFSET;
480 poff = pos & ~PAGE_MASK;
481 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT);
482 map = kmap(pg);
483 if (is_write)
484 memcpy(map + poff, buf, count);
485 else
486 memcpy(buf, map + poff, count);
487 kunmap(pg);
488 put_page(pg);
489
490 } else {
491 dev_dbg(dev, "%s: %s @0x%llx (unhandled)\n",
492 __func__, is_write ? "WR" : "RD", pos);
493 ret = -1;
494 goto accessfailed;
495 }
496
497 ret = count;
498
499
500 accessfailed:
501 mutex_unlock(&mdev_state->ops_lock);
502
503 return ret;
504 }
505
506 static int mbochs_reset(struct mdev_device *mdev)
507 {
508 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
509 u32 size64k = mdev_state->memsize / (64 * 1024);
510 int i;
511
512 for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++)
513 mdev_state->vbe[i] = 0;
514 mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5;
515 mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k;
516 return 0;
517 }
518
519 static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
520 {
521 const struct mbochs_type *type = mbochs_find_type(kobj);
522 struct device *dev = mdev_dev(mdev);
523 struct mdev_state *mdev_state;
524
525 if (!type)
526 type = &mbochs_types[0];
527 if (type->mbytes + mbochs_used_mbytes > max_mbytes)
528 return -ENOMEM;
529
530 mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
531 if (mdev_state == NULL)
532 return -ENOMEM;
533
534 mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
535 if (mdev_state->vconfig == NULL)
536 goto err_mem;
537
538 mdev_state->memsize = type->mbytes * 1024 * 1024;
539 mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT;
540 mdev_state->pages = kcalloc(mdev_state->pagecount,
541 sizeof(struct page *),
542 GFP_KERNEL);
543 if (!mdev_state->pages)
544 goto err_mem;
545
546 dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__,
547 kobj->name, type->mbytes, mdev_state->pagecount);
548
549 mutex_init(&mdev_state->ops_lock);
550 mdev_state->mdev = mdev;
551 mdev_set_drvdata(mdev, mdev_state);
552 INIT_LIST_HEAD(&mdev_state->dmabufs);
553 mdev_state->next_id = 1;
554
555 mdev_state->type = type;
556 mdev_state->edid_regs.max_xres = type->max_x;
557 mdev_state->edid_regs.max_yres = type->max_y;
558 mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET;
559 mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob);
560 mbochs_create_config_space(mdev_state);
561 mbochs_reset(mdev);
562
563 mbochs_used_mbytes += type->mbytes;
564 return 0;
565
566 err_mem:
567 kfree(mdev_state->vconfig);
568 kfree(mdev_state);
569 return -ENOMEM;
570 }
571
572 static int mbochs_remove(struct mdev_device *mdev)
573 {
574 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
575
576 mbochs_used_mbytes -= mdev_state->type->mbytes;
577 mdev_set_drvdata(mdev, NULL);
578 kfree(mdev_state->pages);
579 kfree(mdev_state->vconfig);
580 kfree(mdev_state);
581 return 0;
582 }
583
584 static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
585 size_t count, loff_t *ppos)
586 {
587 unsigned int done = 0;
588 int ret;
589
590 while (count) {
591 size_t filled;
592
593 if (count >= 4 && !(*ppos % 4)) {
594 u32 val;
595
596 ret = mdev_access(mdev, (char *)&val, sizeof(val),
597 *ppos, false);
598 if (ret <= 0)
599 goto read_err;
600
601 if (copy_to_user(buf, &val, sizeof(val)))
602 goto read_err;
603
604 filled = 4;
605 } else if (count >= 2 && !(*ppos % 2)) {
606 u16 val;
607
608 ret = mdev_access(mdev, (char *)&val, sizeof(val),
609 *ppos, false);
610 if (ret <= 0)
611 goto read_err;
612
613 if (copy_to_user(buf, &val, sizeof(val)))
614 goto read_err;
615
616 filled = 2;
617 } else {
618 u8 val;
619
620 ret = mdev_access(mdev, (char *)&val, sizeof(val),
621 *ppos, false);
622 if (ret <= 0)
623 goto read_err;
624
625 if (copy_to_user(buf, &val, sizeof(val)))
626 goto read_err;
627
628 filled = 1;
629 }
630
631 count -= filled;
632 done += filled;
633 *ppos += filled;
634 buf += filled;
635 }
636
637 return done;
638
639 read_err:
640 return -EFAULT;
641 }
642
643 static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
644 size_t count, loff_t *ppos)
645 {
646 unsigned int done = 0;
647 int ret;
648
649 while (count) {
650 size_t filled;
651
652 if (count >= 4 && !(*ppos % 4)) {
653 u32 val;
654
655 if (copy_from_user(&val, buf, sizeof(val)))
656 goto write_err;
657
658 ret = mdev_access(mdev, (char *)&val, sizeof(val),
659 *ppos, true);
660 if (ret <= 0)
661 goto write_err;
662
663 filled = 4;
664 } else if (count >= 2 && !(*ppos % 2)) {
665 u16 val;
666
667 if (copy_from_user(&val, buf, sizeof(val)))
668 goto write_err;
669
670 ret = mdev_access(mdev, (char *)&val, sizeof(val),
671 *ppos, true);
672 if (ret <= 0)
673 goto write_err;
674
675 filled = 2;
676 } else {
677 u8 val;
678
679 if (copy_from_user(&val, buf, sizeof(val)))
680 goto write_err;
681
682 ret = mdev_access(mdev, (char *)&val, sizeof(val),
683 *ppos, true);
684 if (ret <= 0)
685 goto write_err;
686
687 filled = 1;
688 }
689 count -= filled;
690 done += filled;
691 *ppos += filled;
692 buf += filled;
693 }
694
695 return done;
696 write_err:
697 return -EFAULT;
698 }
699
700 static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
701 pgoff_t pgoff)
702 {
703 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
704
705 if (!mdev_state->pages[pgoff]) {
706 mdev_state->pages[pgoff] =
707 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0);
708 if (!mdev_state->pages[pgoff])
709 return NULL;
710 }
711
712 get_page(mdev_state->pages[pgoff]);
713 return mdev_state->pages[pgoff];
714 }
715
716 static struct page *mbochs_get_page(struct mdev_state *mdev_state,
717 pgoff_t pgoff)
718 {
719 struct page *page;
720
721 if (WARN_ON(pgoff >= mdev_state->pagecount))
722 return NULL;
723
724 mutex_lock(&mdev_state->ops_lock);
725 page = __mbochs_get_page(mdev_state, pgoff);
726 mutex_unlock(&mdev_state->ops_lock);
727
728 return page;
729 }
730
731 static void mbochs_put_pages(struct mdev_state *mdev_state)
732 {
733 struct device *dev = mdev_dev(mdev_state->mdev);
734 int i, count = 0;
735
736 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
737
738 for (i = 0; i < mdev_state->pagecount; i++) {
739 if (!mdev_state->pages[i])
740 continue;
741 put_page(mdev_state->pages[i]);
742 mdev_state->pages[i] = NULL;
743 count++;
744 }
745 dev_dbg(dev, "%s: %d pages released\n", __func__, count);
746 }
747
748 static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf)
749 {
750 struct vm_area_struct *vma = vmf->vma;
751 struct mdev_state *mdev_state = vma->vm_private_data;
752 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
753
754 if (page_offset >= mdev_state->pagecount)
755 return VM_FAULT_SIGBUS;
756
757 vmf->page = mbochs_get_page(mdev_state, page_offset);
758 if (!vmf->page)
759 return VM_FAULT_SIGBUS;
760
761 return 0;
762 }
763
764 static const struct vm_operations_struct mbochs_region_vm_ops = {
765 .fault = mbochs_region_vm_fault,
766 };
767
768 static int mbochs_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
769 {
770 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
771
772 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
773 return -EINVAL;
774 if (vma->vm_end < vma->vm_start)
775 return -EINVAL;
776 if (vma->vm_end - vma->vm_start > mdev_state->memsize)
777 return -EINVAL;
778 if ((vma->vm_flags & VM_SHARED) == 0)
779 return -EINVAL;
780
781 vma->vm_ops = &mbochs_region_vm_ops;
782 vma->vm_private_data = mdev_state;
783 return 0;
784 }
785
786 static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf)
787 {
788 struct vm_area_struct *vma = vmf->vma;
789 struct mbochs_dmabuf *dmabuf = vma->vm_private_data;
790
791 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount))
792 return VM_FAULT_SIGBUS;
793
794 vmf->page = dmabuf->pages[vmf->pgoff];
795 get_page(vmf->page);
796 return 0;
797 }
798
799 static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
800 .fault = mbochs_dmabuf_vm_fault,
801 };
802
803 static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
804 {
805 struct mbochs_dmabuf *dmabuf = buf->priv;
806 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
807
808 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
809
810 if ((vma->vm_flags & VM_SHARED) == 0)
811 return -EINVAL;
812
813 vma->vm_ops = &mbochs_dmabuf_vm_ops;
814 vma->vm_private_data = dmabuf;
815 return 0;
816 }
817
818 static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf,
819 const char *prefix)
820 {
821 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
822 u32 fourcc = dmabuf->mode.drm_format;
823
824 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n",
825 prefix, dmabuf->id,
826 fourcc ? ((fourcc >> 0) & 0xff) : '-',
827 fourcc ? ((fourcc >> 8) & 0xff) : '-',
828 fourcc ? ((fourcc >> 16) & 0xff) : '-',
829 fourcc ? ((fourcc >> 24) & 0xff) : '-',
830 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride,
831 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount);
832 }
833
834 static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at,
835 enum dma_data_direction direction)
836 {
837 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
838 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
839 struct sg_table *sg;
840
841 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
842
843 sg = kzalloc(sizeof(*sg), GFP_KERNEL);
844 if (!sg)
845 goto err1;
846 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount,
847 0, dmabuf->mode.size, GFP_KERNEL) < 0)
848 goto err2;
849 if (dma_map_sgtable(at->dev, sg, direction, 0))
850 goto err3;
851
852 return sg;
853
854 err3:
855 sg_free_table(sg);
856 err2:
857 kfree(sg);
858 err1:
859 return ERR_PTR(-ENOMEM);
860 }
861
862 static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at,
863 struct sg_table *sg,
864 enum dma_data_direction direction)
865 {
866 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
867 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
868
869 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
870
871 dma_unmap_sgtable(at->dev, sg, direction, 0);
872 sg_free_table(sg);
873 kfree(sg);
874 }
875
876 static void mbochs_release_dmabuf(struct dma_buf *buf)
877 {
878 struct mbochs_dmabuf *dmabuf = buf->priv;
879 struct mdev_state *mdev_state = dmabuf->mdev_state;
880 struct device *dev = mdev_dev(mdev_state->mdev);
881 pgoff_t pg;
882
883 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
884
885 for (pg = 0; pg < dmabuf->pagecount; pg++)
886 put_page(dmabuf->pages[pg]);
887
888 mutex_lock(&mdev_state->ops_lock);
889 dmabuf->buf = NULL;
890 if (dmabuf->unlinked)
891 kfree(dmabuf);
892 mutex_unlock(&mdev_state->ops_lock);
893 }
894
895 static struct dma_buf_ops mbochs_dmabuf_ops = {
896 .map_dma_buf = mbochs_map_dmabuf,
897 .unmap_dma_buf = mbochs_unmap_dmabuf,
898 .release = mbochs_release_dmabuf,
899 .mmap = mbochs_mmap_dmabuf,
900 };
901
902 static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state,
903 struct mbochs_mode *mode)
904 {
905 struct mbochs_dmabuf *dmabuf;
906 pgoff_t page_offset, pg;
907
908 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
909
910 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL);
911 if (!dmabuf)
912 return NULL;
913
914 dmabuf->mode = *mode;
915 dmabuf->id = mdev_state->next_id++;
916 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE);
917 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *),
918 GFP_KERNEL);
919 if (!dmabuf->pages)
920 goto err_free_dmabuf;
921
922 page_offset = dmabuf->mode.offset >> PAGE_SHIFT;
923 for (pg = 0; pg < dmabuf->pagecount; pg++) {
924 dmabuf->pages[pg] = __mbochs_get_page(mdev_state,
925 page_offset + pg);
926 if (!dmabuf->pages[pg])
927 goto err_free_pages;
928 }
929
930 dmabuf->mdev_state = mdev_state;
931 list_add(&dmabuf->next, &mdev_state->dmabufs);
932
933 mbochs_print_dmabuf(dmabuf, __func__);
934 return dmabuf;
935
936 err_free_pages:
937 while (pg > 0)
938 put_page(dmabuf->pages[--pg]);
939 kfree(dmabuf->pages);
940 err_free_dmabuf:
941 kfree(dmabuf);
942 return NULL;
943 }
944
945 static struct mbochs_dmabuf *
946 mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state,
947 struct mbochs_mode *mode)
948 {
949 struct mbochs_dmabuf *dmabuf;
950
951 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
952
953 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
954 if (mbochs_modes_equal(&dmabuf->mode, mode))
955 return dmabuf;
956
957 return NULL;
958 }
959
960 static struct mbochs_dmabuf *
961 mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
962 {
963 struct mbochs_dmabuf *dmabuf;
964
965 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
966
967 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
968 if (dmabuf->id == id)
969 return dmabuf;
970
971 return NULL;
972 }
973
974 static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
975 {
976 struct mdev_state *mdev_state = dmabuf->mdev_state;
977 struct device *dev = mdev_dev(mdev_state->mdev);
978 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
979 struct dma_buf *buf;
980
981 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
982
983 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) {
984 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n",
985 __func__);
986 return -EINVAL;
987 }
988
989 exp_info.ops = &mbochs_dmabuf_ops;
990 exp_info.size = dmabuf->mode.size;
991 exp_info.priv = dmabuf;
992
993 buf = dma_buf_export(&exp_info);
994 if (IS_ERR(buf)) {
995 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n",
996 __func__, PTR_ERR(buf));
997 return PTR_ERR(buf);
998 }
999
1000 dmabuf->buf = buf;
1001 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
1002 return 0;
1003 }
1004
1005 static int mbochs_get_region_info(struct mdev_device *mdev,
1006 struct vfio_region_info_ext *ext)
1007 {
1008 struct vfio_region_info *region_info = &ext->base;
1009 struct mdev_state *mdev_state;
1010
1011 mdev_state = mdev_get_drvdata(mdev);
1012 if (!mdev_state)
1013 return -EINVAL;
1014
1015 if (region_info->index >= MBOCHS_NUM_REGIONS)
1016 return -EINVAL;
1017
1018 switch (region_info->index) {
1019 case VFIO_PCI_CONFIG_REGION_INDEX:
1020 region_info->offset = 0;
1021 region_info->size = MBOCHS_CONFIG_SPACE_SIZE;
1022 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1023 VFIO_REGION_INFO_FLAG_WRITE);
1024 break;
1025 case VFIO_PCI_BAR0_REGION_INDEX:
1026 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET;
1027 region_info->size = mdev_state->memsize;
1028 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1029 VFIO_REGION_INFO_FLAG_WRITE |
1030 VFIO_REGION_INFO_FLAG_MMAP);
1031 break;
1032 case VFIO_PCI_BAR2_REGION_INDEX:
1033 region_info->offset = MBOCHS_MMIO_BAR_OFFSET;
1034 region_info->size = MBOCHS_MMIO_BAR_SIZE;
1035 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1036 VFIO_REGION_INFO_FLAG_WRITE);
1037 break;
1038 case MBOCHS_EDID_REGION_INDEX:
1039 ext->base.argsz = sizeof(*ext);
1040 ext->base.offset = MBOCHS_EDID_OFFSET;
1041 ext->base.size = MBOCHS_EDID_SIZE;
1042 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ |
1043 VFIO_REGION_INFO_FLAG_WRITE |
1044 VFIO_REGION_INFO_FLAG_CAPS);
1045 ext->base.cap_offset = offsetof(typeof(*ext), type);
1046 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE;
1047 ext->type.header.version = 1;
1048 ext->type.header.next = 0;
1049 ext->type.type = VFIO_REGION_TYPE_GFX;
1050 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID;
1051 break;
1052 default:
1053 region_info->size = 0;
1054 region_info->offset = 0;
1055 region_info->flags = 0;
1056 }
1057
1058 return 0;
1059 }
1060
1061 static int mbochs_get_irq_info(struct mdev_device *mdev,
1062 struct vfio_irq_info *irq_info)
1063 {
1064 irq_info->count = 0;
1065 return 0;
1066 }
1067
1068 static int mbochs_get_device_info(struct mdev_device *mdev,
1069 struct vfio_device_info *dev_info)
1070 {
1071 dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
1072 dev_info->num_regions = MBOCHS_NUM_REGIONS;
1073 dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
1074 return 0;
1075 }
1076
1077 static int mbochs_query_gfx_plane(struct mdev_device *mdev,
1078 struct vfio_device_gfx_plane_info *plane)
1079 {
1080 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1081 struct device *dev = mdev_dev(mdev);
1082 struct mbochs_dmabuf *dmabuf;
1083 struct mbochs_mode mode;
1084 int ret;
1085
1086 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
1087 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
1088 VFIO_GFX_PLANE_TYPE_DMABUF))
1089 return 0;
1090 return -EINVAL;
1091 }
1092
1093 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF)
1094 return -EINVAL;
1095
1096 plane->drm_format_mod = 0;
1097 plane->x_pos = 0;
1098 plane->y_pos = 0;
1099 plane->x_hot = 0;
1100 plane->y_hot = 0;
1101
1102 mutex_lock(&mdev_state->ops_lock);
1103
1104 ret = -EINVAL;
1105 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY)
1106 ret = mbochs_check_framebuffer(mdev_state, &mode);
1107 if (ret < 0) {
1108 plane->drm_format = 0;
1109 plane->width = 0;
1110 plane->height = 0;
1111 plane->stride = 0;
1112 plane->size = 0;
1113 plane->dmabuf_id = 0;
1114 goto done;
1115 }
1116
1117 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode);
1118 if (!dmabuf)
1119 mbochs_dmabuf_alloc(mdev_state, &mode);
1120 if (!dmabuf) {
1121 mutex_unlock(&mdev_state->ops_lock);
1122 return -ENOMEM;
1123 }
1124
1125 plane->drm_format = dmabuf->mode.drm_format;
1126 plane->width = dmabuf->mode.width;
1127 plane->height = dmabuf->mode.height;
1128 plane->stride = dmabuf->mode.stride;
1129 plane->size = dmabuf->mode.size;
1130 plane->dmabuf_id = dmabuf->id;
1131
1132 done:
1133 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY &&
1134 mdev_state->active_id != plane->dmabuf_id) {
1135 dev_dbg(dev, "%s: primary: %d => %d\n", __func__,
1136 mdev_state->active_id, plane->dmabuf_id);
1137 mdev_state->active_id = plane->dmabuf_id;
1138 }
1139 mutex_unlock(&mdev_state->ops_lock);
1140 return 0;
1141 }
1142
1143 static int mbochs_get_gfx_dmabuf(struct mdev_device *mdev,
1144 u32 id)
1145 {
1146 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1147 struct mbochs_dmabuf *dmabuf;
1148
1149 mutex_lock(&mdev_state->ops_lock);
1150
1151 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id);
1152 if (!dmabuf) {
1153 mutex_unlock(&mdev_state->ops_lock);
1154 return -ENOENT;
1155 }
1156
1157 if (!dmabuf->buf)
1158 mbochs_dmabuf_export(dmabuf);
1159
1160 mutex_unlock(&mdev_state->ops_lock);
1161
1162 if (!dmabuf->buf)
1163 return -EINVAL;
1164
1165 return dma_buf_fd(dmabuf->buf, 0);
1166 }
1167
1168 static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
1169 unsigned long arg)
1170 {
1171 int ret = 0;
1172 unsigned long minsz, outsz;
1173
1174 switch (cmd) {
1175 case VFIO_DEVICE_GET_INFO:
1176 {
1177 struct vfio_device_info info;
1178
1179 minsz = offsetofend(struct vfio_device_info, num_irqs);
1180
1181 if (copy_from_user(&info, (void __user *)arg, minsz))
1182 return -EFAULT;
1183
1184 if (info.argsz < minsz)
1185 return -EINVAL;
1186
1187 ret = mbochs_get_device_info(mdev, &info);
1188 if (ret)
1189 return ret;
1190
1191 if (copy_to_user((void __user *)arg, &info, minsz))
1192 return -EFAULT;
1193
1194 return 0;
1195 }
1196 case VFIO_DEVICE_GET_REGION_INFO:
1197 {
1198 struct vfio_region_info_ext info;
1199
1200 minsz = offsetofend(typeof(info), base.offset);
1201
1202 if (copy_from_user(&info, (void __user *)arg, minsz))
1203 return -EFAULT;
1204
1205 outsz = info.base.argsz;
1206 if (outsz < minsz)
1207 return -EINVAL;
1208 if (outsz > sizeof(info))
1209 return -EINVAL;
1210
1211 ret = mbochs_get_region_info(mdev, &info);
1212 if (ret)
1213 return ret;
1214
1215 if (copy_to_user((void __user *)arg, &info, outsz))
1216 return -EFAULT;
1217
1218 return 0;
1219 }
1220
1221 case VFIO_DEVICE_GET_IRQ_INFO:
1222 {
1223 struct vfio_irq_info info;
1224
1225 minsz = offsetofend(struct vfio_irq_info, count);
1226
1227 if (copy_from_user(&info, (void __user *)arg, minsz))
1228 return -EFAULT;
1229
1230 if ((info.argsz < minsz) ||
1231 (info.index >= VFIO_PCI_NUM_IRQS))
1232 return -EINVAL;
1233
1234 ret = mbochs_get_irq_info(mdev, &info);
1235 if (ret)
1236 return ret;
1237
1238 if (copy_to_user((void __user *)arg, &info, minsz))
1239 return -EFAULT;
1240
1241 return 0;
1242 }
1243
1244 case VFIO_DEVICE_QUERY_GFX_PLANE:
1245 {
1246 struct vfio_device_gfx_plane_info plane;
1247
1248 minsz = offsetofend(struct vfio_device_gfx_plane_info,
1249 region_index);
1250
1251 if (copy_from_user(&plane, (void __user *)arg, minsz))
1252 return -EFAULT;
1253
1254 if (plane.argsz < minsz)
1255 return -EINVAL;
1256
1257 ret = mbochs_query_gfx_plane(mdev, &plane);
1258 if (ret)
1259 return ret;
1260
1261 if (copy_to_user((void __user *)arg, &plane, minsz))
1262 return -EFAULT;
1263
1264 return 0;
1265 }
1266
1267 case VFIO_DEVICE_GET_GFX_DMABUF:
1268 {
1269 u32 dmabuf_id;
1270
1271 if (get_user(dmabuf_id, (__u32 __user *)arg))
1272 return -EFAULT;
1273
1274 return mbochs_get_gfx_dmabuf(mdev, dmabuf_id);
1275 }
1276
1277 case VFIO_DEVICE_SET_IRQS:
1278 return -EINVAL;
1279
1280 case VFIO_DEVICE_RESET:
1281 return mbochs_reset(mdev);
1282 }
1283 return -ENOTTY;
1284 }
1285
1286 static int mbochs_open(struct mdev_device *mdev)
1287 {
1288 if (!try_module_get(THIS_MODULE))
1289 return -ENODEV;
1290
1291 return 0;
1292 }
1293
1294 static void mbochs_close(struct mdev_device *mdev)
1295 {
1296 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1297 struct mbochs_dmabuf *dmabuf, *tmp;
1298
1299 mutex_lock(&mdev_state->ops_lock);
1300
1301 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) {
1302 list_del(&dmabuf->next);
1303 if (dmabuf->buf) {
1304 /* free in mbochs_release_dmabuf() */
1305 dmabuf->unlinked = true;
1306 } else {
1307 kfree(dmabuf);
1308 }
1309 }
1310 mbochs_put_pages(mdev_state);
1311
1312 mutex_unlock(&mdev_state->ops_lock);
1313 module_put(THIS_MODULE);
1314 }
1315
1316 static ssize_t
1317 memory_show(struct device *dev, struct device_attribute *attr,
1318 char *buf)
1319 {
1320 struct mdev_device *mdev = mdev_from_dev(dev);
1321 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1322
1323 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes);
1324 }
1325 static DEVICE_ATTR_RO(memory);
1326
1327 static struct attribute *mdev_dev_attrs[] = {
1328 &dev_attr_memory.attr,
1329 NULL,
1330 };
1331
1332 static const struct attribute_group mdev_dev_group = {
1333 .name = "vendor",
1334 .attrs = mdev_dev_attrs,
1335 };
1336
1337 const struct attribute_group *mdev_dev_groups[] = {
1338 &mdev_dev_group,
1339 NULL,
1340 };
1341
1342 static ssize_t
1343 name_show(struct kobject *kobj, struct device *dev, char *buf)
1344 {
1345 return sprintf(buf, "%s\n", kobj->name);
1346 }
1347 MDEV_TYPE_ATTR_RO(name);
1348
1349 static ssize_t
1350 description_show(struct kobject *kobj, struct device *dev, char *buf)
1351 {
1352 const struct mbochs_type *type = mbochs_find_type(kobj);
1353
1354 return sprintf(buf, "virtual display, %d MB video memory\n",
1355 type ? type->mbytes : 0);
1356 }
1357 MDEV_TYPE_ATTR_RO(description);
1358
1359 static ssize_t
1360 available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
1361 {
1362 const struct mbochs_type *type = mbochs_find_type(kobj);
1363 int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
1364
1365 return sprintf(buf, "%d\n", count);
1366 }
1367 MDEV_TYPE_ATTR_RO(available_instances);
1368
1369 static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
1370 char *buf)
1371 {
1372 return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
1373 }
1374 MDEV_TYPE_ATTR_RO(device_api);
1375
1376 static struct attribute *mdev_types_attrs[] = {
1377 &mdev_type_attr_name.attr,
1378 &mdev_type_attr_description.attr,
1379 &mdev_type_attr_device_api.attr,
1380 &mdev_type_attr_available_instances.attr,
1381 NULL,
1382 };
1383
1384 static struct attribute_group mdev_type_group1 = {
1385 .name = MBOCHS_TYPE_1,
1386 .attrs = mdev_types_attrs,
1387 };
1388
1389 static struct attribute_group mdev_type_group2 = {
1390 .name = MBOCHS_TYPE_2,
1391 .attrs = mdev_types_attrs,
1392 };
1393
1394 static struct attribute_group mdev_type_group3 = {
1395 .name = MBOCHS_TYPE_3,
1396 .attrs = mdev_types_attrs,
1397 };
1398
1399 static struct attribute_group *mdev_type_groups[] = {
1400 &mdev_type_group1,
1401 &mdev_type_group2,
1402 &mdev_type_group3,
1403 NULL,
1404 };
1405
1406 static const struct mdev_parent_ops mdev_fops = {
1407 .owner = THIS_MODULE,
1408 .mdev_attr_groups = mdev_dev_groups,
1409 .supported_type_groups = mdev_type_groups,
1410 .create = mbochs_create,
1411 .remove = mbochs_remove,
1412 .open = mbochs_open,
1413 .release = mbochs_close,
1414 .read = mbochs_read,
1415 .write = mbochs_write,
1416 .ioctl = mbochs_ioctl,
1417 .mmap = mbochs_mmap,
1418 };
1419
1420 static const struct file_operations vd_fops = {
1421 .owner = THIS_MODULE,
1422 };
1423
1424 static void mbochs_device_release(struct device *dev)
1425 {
1426 /* nothing */
1427 }
1428
1429 static int __init mbochs_dev_init(void)
1430 {
1431 int ret = 0;
1432
1433 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
1434 if (ret < 0) {
1435 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
1436 return ret;
1437 }
1438 cdev_init(&mbochs_cdev, &vd_fops);
1439 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
1440 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
1441
1442 mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
1443 if (IS_ERR(mbochs_class)) {
1444 pr_err("Error: failed to register mbochs_dev class\n");
1445 ret = PTR_ERR(mbochs_class);
1446 goto failed1;
1447 }
1448 mbochs_dev.class = mbochs_class;
1449 mbochs_dev.release = mbochs_device_release;
1450 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME);
1451
1452 ret = device_register(&mbochs_dev);
1453 if (ret)
1454 goto failed2;
1455
1456 ret = mdev_register_device(&mbochs_dev, &mdev_fops);
1457 if (ret)
1458 goto failed3;
1459
1460 return 0;
1461
1462 failed3:
1463 device_unregister(&mbochs_dev);
1464 failed2:
1465 class_destroy(mbochs_class);
1466 failed1:
1467 cdev_del(&mbochs_cdev);
1468 unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1469 return ret;
1470 }
1471
1472 static void __exit mbochs_dev_exit(void)
1473 {
1474 mbochs_dev.bus = NULL;
1475 mdev_unregister_device(&mbochs_dev);
1476
1477 device_unregister(&mbochs_dev);
1478 cdev_del(&mbochs_cdev);
1479 unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1480 class_destroy(mbochs_class);
1481 mbochs_class = NULL;
1482 }
1483
1484 module_init(mbochs_dev_init)
1485 module_exit(mbochs_dev_exit)
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