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Merge tag 'zynqmp-soc-clk-for-v4.20' of https://github.com/Xilinx/linux-xlnx into...
[linux-block.git] / samples / vfio-mdev / mbochs.c
CommitLineData
a5e6e650
GH		 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_CONFIG_SPACE_SIZE 0xff
75#define MBOCHS_MMIO_BAR_OFFSET PAGE_SIZE
76#define MBOCHS_MMIO_BAR_SIZE PAGE_SIZE
77#define MBOCHS_MEMORY_BAR_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \
78 MBOCHS_MMIO_BAR_SIZE)
79
80#define STORE_LE16(addr, val) (*(u16 *)addr = val)
81#define STORE_LE32(addr, val) (*(u32 *)addr = val)
82
83
84MODULE_LICENSE("GPL v2");
85
86static int max_mbytes = 256;
87module_param_named(count, max_mbytes, int, 0444);
88MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices");
89
90
91#define MBOCHS_TYPE_1 "small"
92#define MBOCHS_TYPE_2 "medium"
93#define MBOCHS_TYPE_3 "large"
94
95static const struct mbochs_type {
96 const char *name;
97 u32 mbytes;
98} mbochs_types[] = {
99 {
100 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1,
101 .mbytes = 4,
102 }, {
103 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2,
104 .mbytes = 16,
105 }, {
106 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3,
107 .mbytes = 64,
108 },
109};
110
111
112static dev_t mbochs_devt;
113static struct class *mbochs_class;
114static struct cdev mbochs_cdev;
115static struct device mbochs_dev;
116static int mbochs_used_mbytes;
117
118struct mbochs_mode {
119 u32 drm_format;
120 u32 bytepp;
121 u32 width;
122 u32 height;
123 u32 stride;
124 u32 __pad;
125 u64 offset;
126 u64 size;
127};
128
129struct mbochs_dmabuf {
130 struct mbochs_mode mode;
131 u32 id;
132 struct page **pages;
133 pgoff_t pagecount;
134 struct dma_buf *buf;
135 struct mdev_state *mdev_state;
136 struct list_head next;
137 bool unlinked;
138};
139
140/* State of each mdev device */
141struct mdev_state {
142 u8 *vconfig;
143 u64 bar_mask[3];
144 u32 memory_bar_mask;
145 struct mutex ops_lock;
146 struct mdev_device *mdev;
147 struct vfio_device_info dev_info;
148
149 const struct mbochs_type *type;
150 u16 vbe[VBE_DISPI_INDEX_COUNT];
151 u64 memsize;
152 struct page **pages;
153 pgoff_t pagecount;
154
155 struct list_head dmabufs;
156 u32 active_id;
157 u32 next_id;
158};
159
160static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = {
161 [VBE_DISPI_INDEX_ID] = "id",
162 [VBE_DISPI_INDEX_XRES] = "xres",
163 [VBE_DISPI_INDEX_YRES] = "yres",
164 [VBE_DISPI_INDEX_BPP] = "bpp",
165 [VBE_DISPI_INDEX_ENABLE] = "enable",
166 [VBE_DISPI_INDEX_BANK] = "bank",
167 [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width",
168 [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height",
169 [VBE_DISPI_INDEX_X_OFFSET] = "x-offset",
170 [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset",
171 [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem",
172};
173
174static const char *vbe_name(u32 index)
175{
176 if (index < ARRAY_SIZE(vbe_name_list))
177 return vbe_name_list[index];
178 return "(invalid)";
179}
180
498e8bf5
AK		 181static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
182 pgoff_t pgoff);
a5e6e650
GH		 183static struct page *mbochs_get_page(struct mdev_state *mdev_state,
184 pgoff_t pgoff);
185
186static const struct mbochs_type *mbochs_find_type(struct kobject *kobj)
187{
188 int i;
189
190 for (i = 0; i < ARRAY_SIZE(mbochs_types); i++)
191 if (strcmp(mbochs_types[i].name, kobj->name) == 0)
192 return mbochs_types + i;
193 return NULL;
194}
195
196static void mbochs_create_config_space(struct mdev_state *mdev_state)
197{
198 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID],
199 0x1234);
200 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID],
201 0x1111);
202 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID],
203 PCI_SUBVENDOR_ID_REDHAT_QUMRANET);
204 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID],
205 PCI_SUBDEVICE_ID_QEMU);
206
207 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND],
208 PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
209 STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE],
210 PCI_CLASS_DISPLAY_OTHER);
211 mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01;
212
213 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0],
214 PCI_BASE_ADDRESS_SPACE_MEMORY |
215 PCI_BASE_ADDRESS_MEM_TYPE_32 |
216 PCI_BASE_ADDRESS_MEM_PREFETCH);
217 mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1;
218
219 STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2],
220 PCI_BASE_ADDRESS_SPACE_MEMORY |
221 PCI_BASE_ADDRESS_MEM_TYPE_32);
222 mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1;
223}
224
225static int mbochs_check_framebuffer(struct mdev_state *mdev_state,
226 struct mbochs_mode *mode)
227{
228 struct device *dev = mdev_dev(mdev_state->mdev);
229 u16 *vbe = mdev_state->vbe;
230 u32 virt_width;
231
232 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
233
234 if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED))
235 goto nofb;
236
237 memset(mode, 0, sizeof(*mode));
238 switch (vbe[VBE_DISPI_INDEX_BPP]) {
239 case 32:
240 mode->drm_format = DRM_FORMAT_XRGB8888;
241 mode->bytepp = 4;
242 break;
243 default:
244 dev_info_ratelimited(dev, "%s: bpp %d not supported\n",
245 __func__, vbe[VBE_DISPI_INDEX_BPP]);
246 goto nofb;
247 }
248
249 mode->width = vbe[VBE_DISPI_INDEX_XRES];
250 mode->height = vbe[VBE_DISPI_INDEX_YRES];
251 virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH];
252 if (virt_width < mode->width)
253 virt_width = mode->width;
254 mode->stride = virt_width * mode->bytepp;
255 mode->size = (u64)mode->stride * mode->height;
256 mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp +
257 (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride);
258
259 if (mode->width < 64 || mode->height < 64) {
260 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n",
261 __func__, mode->width, mode->height);
262 goto nofb;
263 }
264 if (mode->offset + mode->size > mdev_state->memsize) {
265 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n",
266 __func__);
267 goto nofb;
268 }
269
270 return 0;
271
272nofb:
273 memset(mode, 0, sizeof(*mode));
274 return -EINVAL;
275}
276
277static bool mbochs_modes_equal(struct mbochs_mode *mode1,
278 struct mbochs_mode *mode2)
279{
280 return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0;
281}
282
283static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
284 char *buf, u32 count)
285{
286 struct device *dev = mdev_dev(mdev_state->mdev);
287 int index = (offset - PCI_BASE_ADDRESS_0) / 0x04;
288 u32 cfg_addr;
289
290 switch (offset) {
291 case PCI_BASE_ADDRESS_0:
292 case PCI_BASE_ADDRESS_2:
293 cfg_addr = *(u32 *)buf;
294
295 if (cfg_addr == 0xffffffff) {
296 cfg_addr = (cfg_addr & mdev_state->bar_mask[index]);
297 } else {
298 cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK;
299 if (cfg_addr)
300 dev_info(dev, "BAR #%d @ 0x%x\n",
301 index, cfg_addr);
302 }
303
304 cfg_addr |= (mdev_state->vconfig[offset] &
305 ~PCI_BASE_ADDRESS_MEM_MASK);
306 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr);
307 break;
308 }
309}
310
311static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset,
312 char *buf, u32 count)
313{
314 struct device *dev = mdev_dev(mdev_state->mdev);
315 int index;
316 u16 reg16;
317
318 switch (offset) {
319 case 0x400 ... 0x41f: /* vga ioports remapped */
320 goto unhandled;
321 case 0x500 ... 0x515: /* bochs dispi interface */
322 if (count != 2)
323 goto unhandled;
324 index = (offset - 0x500) / 2;
325 reg16 = *(u16 *)buf;
326 if (index < ARRAY_SIZE(mdev_state->vbe))
327 mdev_state->vbe[index] = reg16;
328 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n",
329 __func__, index, reg16, vbe_name(index));
330 break;
331 case 0x600 ... 0x607: /* qemu extended regs */
332 goto unhandled;
333 default:
334unhandled:
335 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
336 __func__, offset, count);
337 break;
338 }
339}
340
341static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset,
342 char *buf, u32 count)
343{
344 struct device *dev = mdev_dev(mdev_state->mdev);
345 u16 reg16 = 0;
346 int index;
347
348 switch (offset) {
349 case 0x500 ... 0x515: /* bochs dispi interface */
350 if (count != 2)
351 goto unhandled;
352 index = (offset - 0x500) / 2;
353 if (index < ARRAY_SIZE(mdev_state->vbe))
354 reg16 = mdev_state->vbe[index];
355 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n",
356 __func__, index, reg16, vbe_name(index));
357 *(u16 *)buf = reg16;
358 break;
359 default:
360unhandled:
361 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
362 __func__, offset, count);
363 memset(buf, 0, count);
364 break;
365 }
366}
367
368static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
369 loff_t pos, bool is_write)
370{
371 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
372 struct device *dev = mdev_dev(mdev);
373 struct page *pg;
374 loff_t poff;
375 char *map;
376 int ret = 0;
377
378 mutex_lock(&mdev_state->ops_lock);
379
380 if (pos < MBOCHS_CONFIG_SPACE_SIZE) {
381 if (is_write)
382 handle_pci_cfg_write(mdev_state, pos, buf, count);
383 else
384 memcpy(buf, (mdev_state->vconfig + pos), count);
385
386 } else if (pos >= MBOCHS_MMIO_BAR_OFFSET &&
387 pos + count <= MBOCHS_MEMORY_BAR_OFFSET) {
388 pos -= MBOCHS_MMIO_BAR_OFFSET;
389 if (is_write)
390 handle_mmio_write(mdev_state, pos, buf, count);
391 else
392 handle_mmio_read(mdev_state, pos, buf, count);
393
394 } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET &&
395 pos + count <=
396 MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) {
397 pos -= MBOCHS_MMIO_BAR_OFFSET;
398 poff = pos & ~PAGE_MASK;
498e8bf5 399 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT);
a5e6e650
GH		 400 map = kmap(pg);
401 if (is_write)
402 memcpy(map + poff, buf, count);
403 else
404 memcpy(buf, map + poff, count);
405 kunmap(pg);
406 put_page(pg);
407
408 } else {
409 dev_dbg(dev, "%s: %s @0x%llx (unhandled)\n",
410 __func__, is_write ? "WR" : "RD", pos);
411 ret = -1;
412 goto accessfailed;
413 }
414
415 ret = count;
416
417
418accessfailed:
419 mutex_unlock(&mdev_state->ops_lock);
420
421 return ret;
422}
423
424static int mbochs_reset(struct mdev_device *mdev)
425{
426 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
427 u32 size64k = mdev_state->memsize / (64 * 1024);
428 int i;
429
430 for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++)
431 mdev_state->vbe[i] = 0;
432 mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5;
433 mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k;
434 return 0;
435}
436
437static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
438{
439 const struct mbochs_type *type = mbochs_find_type(kobj);
440 struct device *dev = mdev_dev(mdev);
441 struct mdev_state *mdev_state;
442
443 if (!type)
444 type = &mbochs_types[0];
445 if (type->mbytes + mbochs_used_mbytes > max_mbytes)
446 return -ENOMEM;
447
448 mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
449 if (mdev_state == NULL)
450 return -ENOMEM;
451
452 mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
453 if (mdev_state->vconfig == NULL)
454 goto err_mem;
455
456 mdev_state->memsize = type->mbytes * 1024 * 1024;
457 mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT;
458 mdev_state->pages = kcalloc(mdev_state->pagecount,
459 sizeof(struct page *),
460 GFP_KERNEL);
461 if (!mdev_state->pages)
462 goto err_mem;
463
464 dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__,
465 kobj->name, type->mbytes, mdev_state->pagecount);
466
467 mutex_init(&mdev_state->ops_lock);
468 mdev_state->mdev = mdev;
469 mdev_set_drvdata(mdev, mdev_state);
470 INIT_LIST_HEAD(&mdev_state->dmabufs);
471 mdev_state->next_id = 1;
472
473 mdev_state->type = type;
474 mbochs_create_config_space(mdev_state);
475 mbochs_reset(mdev);
476
477 mbochs_used_mbytes += type->mbytes;
478 return 0;
479
480err_mem:
481 kfree(mdev_state->vconfig);
482 kfree(mdev_state);
483 return -ENOMEM;
484}
485
486static int mbochs_remove(struct mdev_device *mdev)
487{
488 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
489
490 mbochs_used_mbytes -= mdev_state->type->mbytes;
491 mdev_set_drvdata(mdev, NULL);
492 kfree(mdev_state->pages);
493 kfree(mdev_state->vconfig);
494 kfree(mdev_state);
495 return 0;
496}
497
498static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
499 size_t count, loff_t *ppos)
500{
501 unsigned int done = 0;
502 int ret;
503
504 while (count) {
505 size_t filled;
506
507 if (count >= 4 && !(*ppos % 4)) {
508 u32 val;
509
510 ret = mdev_access(mdev, (char *)&val, sizeof(val),
511 *ppos, false);
512 if (ret <= 0)
513 goto read_err;
514
515 if (copy_to_user(buf, &val, sizeof(val)))
516 goto read_err;
517
518 filled = 4;
519 } else if (count >= 2 && !(*ppos % 2)) {
520 u16 val;
521
522 ret = mdev_access(mdev, (char *)&val, sizeof(val),
523 *ppos, false);
524 if (ret <= 0)
525 goto read_err;
526
527 if (copy_to_user(buf, &val, sizeof(val)))
528 goto read_err;
529
530 filled = 2;
531 } else {
532 u8 val;
533
534 ret = mdev_access(mdev, (char *)&val, sizeof(val),
535 *ppos, false);
536 if (ret <= 0)
537 goto read_err;
538
539 if (copy_to_user(buf, &val, sizeof(val)))
540 goto read_err;
541
542 filled = 1;
543 }
544
545 count -= filled;
546 done += filled;
547 *ppos += filled;
548 buf += filled;
549 }
550
551 return done;
552
553read_err:
554 return -EFAULT;
555}
556
557static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
558 size_t count, loff_t *ppos)
559{
560 unsigned int done = 0;
561 int ret;
562
563 while (count) {
564 size_t filled;
565
566 if (count >= 4 && !(*ppos % 4)) {
567 u32 val;
568
569 if (copy_from_user(&val, buf, sizeof(val)))
570 goto write_err;
571
572 ret = mdev_access(mdev, (char *)&val, sizeof(val),
573 *ppos, true);
574 if (ret <= 0)
575 goto write_err;
576
577 filled = 4;
578 } else if (count >= 2 && !(*ppos % 2)) {
579 u16 val;
580
581 if (copy_from_user(&val, buf, sizeof(val)))
582 goto write_err;
583
584 ret = mdev_access(mdev, (char *)&val, sizeof(val),
585 *ppos, true);
586 if (ret <= 0)
587 goto write_err;
588
589 filled = 2;
590 } else {
591 u8 val;
592
593 if (copy_from_user(&val, buf, sizeof(val)))
594 goto write_err;
595
596 ret = mdev_access(mdev, (char *)&val, sizeof(val),
597 *ppos, true);
598 if (ret <= 0)
599 goto write_err;
600
601 filled = 1;
602 }
603 count -= filled;
604 done += filled;
605 *ppos += filled;
606 buf += filled;
607 }
608
609 return done;
610write_err:
611 return -EFAULT;
612}
613
614static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
615 pgoff_t pgoff)
616{
617 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
618
619 if (!mdev_state->pages[pgoff]) {
620 mdev_state->pages[pgoff] =
621 alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0);
622 if (!mdev_state->pages[pgoff])
623 return NULL;
624 }
625
626 get_page(mdev_state->pages[pgoff]);
627 return mdev_state->pages[pgoff];
628}
629
630static struct page *mbochs_get_page(struct mdev_state *mdev_state,
631 pgoff_t pgoff)
632{
633 struct page *page;
634
635 if (WARN_ON(pgoff >= mdev_state->pagecount))
636 return NULL;
637
638 mutex_lock(&mdev_state->ops_lock);
639 page = __mbochs_get_page(mdev_state, pgoff);
640 mutex_unlock(&mdev_state->ops_lock);
641
642 return page;
643}
644
645static void mbochs_put_pages(struct mdev_state *mdev_state)
646{
647 struct device *dev = mdev_dev(mdev_state->mdev);
648 int i, count = 0;
649
650 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
651
652 for (i = 0; i < mdev_state->pagecount; i++) {
653 if (!mdev_state->pages[i])
654 continue;
655 put_page(mdev_state->pages[i]);
656 mdev_state->pages[i] = NULL;
657 count++;
658 }
659 dev_dbg(dev, "%s: %d pages released\n", __func__, count);
660}
661
d7ef4899 662static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf)
a5e6e650
GH		 663{
664 struct vm_area_struct *vma = vmf->vma;
665 struct mdev_state *mdev_state = vma->vm_private_data;
666 pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
667
668 if (page_offset >= mdev_state->pagecount)
669 return VM_FAULT_SIGBUS;
670
671 vmf->page = mbochs_get_page(mdev_state, page_offset);
672 if (!vmf->page)
673 return VM_FAULT_SIGBUS;
674
675 return 0;
676}
677
678static const struct vm_operations_struct mbochs_region_vm_ops = {
679 .fault = mbochs_region_vm_fault,
680};
681
682static int mbochs_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
683{
684 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
685
686 if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
687 return -EINVAL;
688 if (vma->vm_end < vma->vm_start)
689 return -EINVAL;
690 if (vma->vm_end - vma->vm_start > mdev_state->memsize)
691 return -EINVAL;
692 if ((vma->vm_flags & VM_SHARED) == 0)
693 return -EINVAL;
694
695 vma->vm_ops = &mbochs_region_vm_ops;
696 vma->vm_private_data = mdev_state;
697 return 0;
698}
699
d7ef4899 700static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf)
a5e6e650
GH		 701{
702 struct vm_area_struct *vma = vmf->vma;
703 struct mbochs_dmabuf *dmabuf = vma->vm_private_data;
704
705 if (WARN_ON(vmf->pgoff >= dmabuf->pagecount))
706 return VM_FAULT_SIGBUS;
707
708 vmf->page = dmabuf->pages[vmf->pgoff];
709 get_page(vmf->page);
710 return 0;
711}
712
713static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
714 .fault = mbochs_dmabuf_vm_fault,
715};
716
717static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
718{
719 struct mbochs_dmabuf *dmabuf = buf->priv;
720 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
721
722 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
723
724 if ((vma->vm_flags & VM_SHARED) == 0)
725 return -EINVAL;
726
727 vma->vm_ops = &mbochs_dmabuf_vm_ops;
728 vma->vm_private_data = dmabuf;
729 return 0;
730}
731
732static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf,
733 const char *prefix)
734{
735 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
736 u32 fourcc = dmabuf->mode.drm_format;
737
738 dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n",
739 prefix, dmabuf->id,
740 fourcc ? ((fourcc >> 0) & 0xff) : '-',
741 fourcc ? ((fourcc >> 8) & 0xff) : '-',
742 fourcc ? ((fourcc >> 16) & 0xff) : '-',
743 fourcc ? ((fourcc >> 24) & 0xff) : '-',
744 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride,
745 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount);
746}
747
748static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at,
749 enum dma_data_direction direction)
750{
751 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
752 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
753 struct sg_table *sg;
754
755 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
756
757 sg = kzalloc(sizeof(*sg), GFP_KERNEL);
758 if (!sg)
759 goto err1;
760 if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount,
761 0, dmabuf->mode.size, GFP_KERNEL) < 0)
762 goto err2;
763 if (!dma_map_sg(at->dev, sg->sgl, sg->nents, direction))
764 goto err3;
765
766 return sg;
767
768err3:
769 sg_free_table(sg);
770err2:
771 kfree(sg);
772err1:
773 return ERR_PTR(-ENOMEM);
774}
775
776static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at,
777 struct sg_table *sg,
778 enum dma_data_direction direction)
779{
780 struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
781 struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
782
783 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
784
785 sg_free_table(sg);
786 kfree(sg);
787}
788
789static void mbochs_release_dmabuf(struct dma_buf *buf)
790{
791 struct mbochs_dmabuf *dmabuf = buf->priv;
792 struct mdev_state *mdev_state = dmabuf->mdev_state;
793 struct device *dev = mdev_dev(mdev_state->mdev);
794 pgoff_t pg;
795
796 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
797
798 for (pg = 0; pg < dmabuf->pagecount; pg++)
799 put_page(dmabuf->pages[pg]);
800
801 mutex_lock(&mdev_state->ops_lock);
802 dmabuf->buf = NULL;
803 if (dmabuf->unlinked)
804 kfree(dmabuf);
805 mutex_unlock(&mdev_state->ops_lock);
806}
807
a5e6e650
GH		 808static void *mbochs_kmap_dmabuf(struct dma_buf *buf, unsigned long page_num)
809{
810 struct mbochs_dmabuf *dmabuf = buf->priv;
811 struct page *page = dmabuf->pages[page_num];
812
813 return kmap(page);
814}
815
7733e05b
GH		 816static void mbochs_kunmap_dmabuf(struct dma_buf *buf, unsigned long page_num,
817 void *vaddr)
818{
819 kunmap(vaddr);
820}
821
a5e6e650
GH		 822static struct dma_buf_ops mbochs_dmabuf_ops = {
823 .map_dma_buf = mbochs_map_dmabuf,
824 .unmap_dma_buf = mbochs_unmap_dmabuf,
825 .release = mbochs_release_dmabuf,
a5e6e650 826 .map = mbochs_kmap_dmabuf,
7733e05b 827 .unmap = mbochs_kunmap_dmabuf,
a5e6e650
GH		 828 .mmap = mbochs_mmap_dmabuf,
829};
830
831static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state,
832 struct mbochs_mode *mode)
833{
834 struct mbochs_dmabuf *dmabuf;
835 pgoff_t page_offset, pg;
836
837 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
838
839 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL);
840 if (!dmabuf)
841 return NULL;
842
843 dmabuf->mode = *mode;
844 dmabuf->id = mdev_state->next_id++;
845 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE);
846 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *),
847 GFP_KERNEL);
848 if (!dmabuf->pages)
849 goto err_free_dmabuf;
850
851 page_offset = dmabuf->mode.offset >> PAGE_SHIFT;
852 for (pg = 0; pg < dmabuf->pagecount; pg++) {
853 dmabuf->pages[pg] = __mbochs_get_page(mdev_state,
854 page_offset + pg);
855 if (!dmabuf->pages[pg])
856 goto err_free_pages;
857 }
858
859 dmabuf->mdev_state = mdev_state;
860 list_add(&dmabuf->next, &mdev_state->dmabufs);
861
862 mbochs_print_dmabuf(dmabuf, __func__);
863 return dmabuf;
864
865err_free_pages:
866 while (pg > 0)
867 put_page(dmabuf->pages[--pg]);
868 kfree(dmabuf->pages);
869err_free_dmabuf:
870 kfree(dmabuf);
871 return NULL;
872}
873
874static struct mbochs_dmabuf *
875mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state,
876 struct mbochs_mode *mode)
877{
878 struct mbochs_dmabuf *dmabuf;
879
880 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
881
882 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
883 if (mbochs_modes_equal(&dmabuf->mode, mode))
884 return dmabuf;
885
886 return NULL;
887}
888
889static struct mbochs_dmabuf *
890mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
891{
892 struct mbochs_dmabuf *dmabuf;
893
894 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
895
896 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
897 if (dmabuf->id == id)
898 return dmabuf;
899
900 return NULL;
901}
902
903static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
904{
905 struct mdev_state *mdev_state = dmabuf->mdev_state;
906 struct device *dev = mdev_dev(mdev_state->mdev);
907 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
908 struct dma_buf *buf;
909
910 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
911
912 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) {
913 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n",
914 __func__);
915 return -EINVAL;
916 }
917
918 exp_info.ops = &mbochs_dmabuf_ops;
919 exp_info.size = dmabuf->mode.size;
920 exp_info.priv = dmabuf;
921
922 buf = dma_buf_export(&exp_info);
923 if (IS_ERR(buf)) {
924 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n",
925 __func__, PTR_ERR(buf));
926 return PTR_ERR(buf);
927 }
928
929 dmabuf->buf = buf;
930 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
931 return 0;
932}
933
934static int mbochs_get_region_info(struct mdev_device *mdev,
935 struct vfio_region_info *region_info,
936 u16 *cap_type_id, void **cap_type)
937{
938 struct mdev_state *mdev_state;
939
940 mdev_state = mdev_get_drvdata(mdev);
941 if (!mdev_state)
942 return -EINVAL;
943
944 if (region_info->index >= VFIO_PCI_NUM_REGIONS)
945 return -EINVAL;
946
947 switch (region_info->index) {
948 case VFIO_PCI_CONFIG_REGION_INDEX:
949 region_info->offset = 0;
950 region_info->size = MBOCHS_CONFIG_SPACE_SIZE;
951 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
952 VFIO_REGION_INFO_FLAG_WRITE);
953 break;
954 case VFIO_PCI_BAR0_REGION_INDEX:
955 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET;
956 region_info->size = mdev_state->memsize;
957 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
958 VFIO_REGION_INFO_FLAG_WRITE |
959 VFIO_REGION_INFO_FLAG_MMAP);
960 break;
961 case VFIO_PCI_BAR2_REGION_INDEX:
962 region_info->offset = MBOCHS_MMIO_BAR_OFFSET;
963 region_info->size = MBOCHS_MMIO_BAR_SIZE;
964 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
965 VFIO_REGION_INFO_FLAG_WRITE);
966 break;
967 default:
968 region_info->size = 0;
969 region_info->offset = 0;
970 region_info->flags = 0;
971 }
972
973 return 0;
974}
975
976static int mbochs_get_irq_info(struct mdev_device *mdev,
977 struct vfio_irq_info *irq_info)
978{
979 irq_info->count = 0;
980 return 0;
981}
982
983static int mbochs_get_device_info(struct mdev_device *mdev,
984 struct vfio_device_info *dev_info)
985{
986 dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
987 dev_info->num_regions = VFIO_PCI_NUM_REGIONS;
988 dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
989 return 0;
990}
991
992static int mbochs_query_gfx_plane(struct mdev_device *mdev,
993 struct vfio_device_gfx_plane_info *plane)
994{
995 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
996 struct device *dev = mdev_dev(mdev);
997 struct mbochs_dmabuf *dmabuf;
998 struct mbochs_mode mode;
999 int ret;
1000
1001 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
1002 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
1003 VFIO_GFX_PLANE_TYPE_DMABUF))
1004 return 0;
1005 return -EINVAL;
1006 }
1007
1008 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF)
1009 return -EINVAL;
1010
1011 plane->drm_format_mod = 0;
1012 plane->x_pos = 0;
1013 plane->y_pos = 0;
1014 plane->x_hot = 0;
1015 plane->y_hot = 0;
1016
1017 mutex_lock(&mdev_state->ops_lock);
1018
1019 ret = -EINVAL;
1020 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY)
1021 ret = mbochs_check_framebuffer(mdev_state, &mode);
1022 if (ret < 0) {
1023 plane->drm_format = 0;
1024 plane->width = 0;
1025 plane->height = 0;
1026 plane->stride = 0;
1027 plane->size = 0;
1028 plane->dmabuf_id = 0;
1029 goto done;
1030 }
1031
1032 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode);
1033 if (!dmabuf)
1034 mbochs_dmabuf_alloc(mdev_state, &mode);
1035 if (!dmabuf) {
1036 mutex_unlock(&mdev_state->ops_lock);
1037 return -ENOMEM;
1038 }
1039
1040 plane->drm_format = dmabuf->mode.drm_format;
1041 plane->width = dmabuf->mode.width;
1042 plane->height = dmabuf->mode.height;
1043 plane->stride = dmabuf->mode.stride;
1044 plane->size = dmabuf->mode.size;
1045 plane->dmabuf_id = dmabuf->id;
1046
1047done:
1048 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY &&
1049 mdev_state->active_id != plane->dmabuf_id) {
1050 dev_dbg(dev, "%s: primary: %d => %d\n", __func__,
1051 mdev_state->active_id, plane->dmabuf_id);
1052 mdev_state->active_id = plane->dmabuf_id;
1053 }
1054 mutex_unlock(&mdev_state->ops_lock);
1055 return 0;
1056}
1057
1058static int mbochs_get_gfx_dmabuf(struct mdev_device *mdev,
1059 u32 id)
1060{
1061 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1062 struct mbochs_dmabuf *dmabuf;
1063
1064 mutex_lock(&mdev_state->ops_lock);
1065
1066 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id);
1067 if (!dmabuf) {
1068 mutex_unlock(&mdev_state->ops_lock);
1069 return -ENOENT;
1070 }
1071
1072 if (!dmabuf->buf)
1073 mbochs_dmabuf_export(dmabuf);
1074
1075 mutex_unlock(&mdev_state->ops_lock);
1076
1077 if (!dmabuf->buf)
1078 return -EINVAL;
1079
1080 return dma_buf_fd(dmabuf->buf, 0);
1081}
1082
1083static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
1084 unsigned long arg)
1085{
1086 int ret = 0;
1087 unsigned long minsz;
1088 struct mdev_state *mdev_state;
1089
1090 mdev_state = mdev_get_drvdata(mdev);
1091
1092 switch (cmd) {
1093 case VFIO_DEVICE_GET_INFO:
1094 {
1095 struct vfio_device_info info;
1096
1097 minsz = offsetofend(struct vfio_device_info, num_irqs);
1098
1099 if (copy_from_user(&info, (void __user *)arg, minsz))
1100 return -EFAULT;
1101
1102 if (info.argsz < minsz)
1103 return -EINVAL;
1104
1105 ret = mbochs_get_device_info(mdev, &info);
1106 if (ret)
1107 return ret;
1108
1109 memcpy(&mdev_state->dev_info, &info, sizeof(info));
1110
1111 if (copy_to_user((void __user *)arg, &info, minsz))
1112 return -EFAULT;
1113
1114 return 0;
1115 }
1116 case VFIO_DEVICE_GET_REGION_INFO:
1117 {
1118 struct vfio_region_info info;
1119 u16 cap_type_id = 0;
1120 void *cap_type = NULL;
1121
1122 minsz = offsetofend(struct vfio_region_info, offset);
1123
1124 if (copy_from_user(&info, (void __user *)arg, minsz))
1125 return -EFAULT;
1126
1127 if (info.argsz < minsz)
1128 return -EINVAL;
1129
1130 ret = mbochs_get_region_info(mdev, &info, &cap_type_id,
1131 &cap_type);
1132 if (ret)
1133 return ret;
1134
1135 if (copy_to_user((void __user *)arg, &info, minsz))
1136 return -EFAULT;
1137
1138 return 0;
1139 }
1140
1141 case VFIO_DEVICE_GET_IRQ_INFO:
1142 {
1143 struct vfio_irq_info info;
1144
1145 minsz = offsetofend(struct vfio_irq_info, count);
1146
1147 if (copy_from_user(&info, (void __user *)arg, minsz))
1148 return -EFAULT;
1149
1150 if ((info.argsz < minsz) ||
1151 (info.index >= mdev_state->dev_info.num_irqs))
1152 return -EINVAL;
1153
1154 ret = mbochs_get_irq_info(mdev, &info);
1155 if (ret)
1156 return ret;
1157
1158 if (copy_to_user((void __user *)arg, &info, minsz))
1159 return -EFAULT;
1160
1161 return 0;
1162 }
1163
1164 case VFIO_DEVICE_QUERY_GFX_PLANE:
1165 {
1166 struct vfio_device_gfx_plane_info plane;
1167
1168 minsz = offsetofend(struct vfio_device_gfx_plane_info,
1169 region_index);
1170
1171 if (copy_from_user(&plane, (void __user *)arg, minsz))
1172 return -EFAULT;
1173
1174 if (plane.argsz < minsz)
1175 return -EINVAL;
1176
1177 ret = mbochs_query_gfx_plane(mdev, &plane);
1178 if (ret)
1179 return ret;
1180
1181 if (copy_to_user((void __user *)arg, &plane, minsz))
1182 return -EFAULT;
1183
1184 return 0;
1185 }
1186
1187 case VFIO_DEVICE_GET_GFX_DMABUF:
1188 {
1189 u32 dmabuf_id;
1190
1191 if (get_user(dmabuf_id, (__u32 __user *)arg))
1192 return -EFAULT;
1193
1194 return mbochs_get_gfx_dmabuf(mdev, dmabuf_id);
1195 }
1196
1197 case VFIO_DEVICE_SET_IRQS:
1198 return -EINVAL;
1199
1200 case VFIO_DEVICE_RESET:
1201 return mbochs_reset(mdev);
1202 }
1203 return -ENOTTY;
1204}
1205
1206static int mbochs_open(struct mdev_device *mdev)
1207{
1208 if (!try_module_get(THIS_MODULE))
1209 return -ENODEV;
1210
1211 return 0;
1212}
1213
1214static void mbochs_close(struct mdev_device *mdev)
1215{
1216 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1217 struct mbochs_dmabuf *dmabuf, *tmp;
1218
1219 mutex_lock(&mdev_state->ops_lock);
1220
1221 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) {
1222 list_del(&dmabuf->next);
1223 if (dmabuf->buf) {
1224 /* free in mbochs_release_dmabuf() */
1225 dmabuf->unlinked = true;
1226 } else {
1227 kfree(dmabuf);
1228 }
1229 }
1230 mbochs_put_pages(mdev_state);
1231
1232 mutex_unlock(&mdev_state->ops_lock);
1233 module_put(THIS_MODULE);
1234}
1235
1236static ssize_t
1237memory_show(struct device *dev, struct device_attribute *attr,
1238 char *buf)
1239{
1240 struct mdev_device *mdev = mdev_from_dev(dev);
1241 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1242
1243 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes);
1244}
1245static DEVICE_ATTR_RO(memory);
1246
1247static struct attribute *mdev_dev_attrs[] = {
1248 &dev_attr_memory.attr,
1249 NULL,
1250};
1251
1252static const struct attribute_group mdev_dev_group = {
1253 .name = "vendor",
1254 .attrs = mdev_dev_attrs,
1255};
1256
1257const struct attribute_group *mdev_dev_groups[] = {
1258 &mdev_dev_group,
1259 NULL,
1260};
1261
1262static ssize_t
1263name_show(struct kobject *kobj, struct device *dev, char *buf)
1264{
1265 return sprintf(buf, "%s\n", kobj->name);
1266}
1267MDEV_TYPE_ATTR_RO(name);
1268
1269static ssize_t
1270description_show(struct kobject *kobj, struct device *dev, char *buf)
1271{
1272 const struct mbochs_type *type = mbochs_find_type(kobj);
1273
1274 return sprintf(buf, "virtual display, %d MB video memory\n",
1275 type ? type->mbytes : 0);
1276}
1277MDEV_TYPE_ATTR_RO(description);
1278
1279static ssize_t
1280available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
1281{
1282 const struct mbochs_type *type = mbochs_find_type(kobj);
1283 int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
1284
1285 return sprintf(buf, "%d\n", count);
1286}
1287MDEV_TYPE_ATTR_RO(available_instances);
1288
1289static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
1290 char *buf)
1291{
1292 return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
1293}
1294MDEV_TYPE_ATTR_RO(device_api);
1295
1296static struct attribute *mdev_types_attrs[] = {
1297 &mdev_type_attr_name.attr,
1298 &mdev_type_attr_description.attr,
1299 &mdev_type_attr_device_api.attr,
1300 &mdev_type_attr_available_instances.attr,
1301 NULL,
1302};
1303
1304static struct attribute_group mdev_type_group1 = {
1305 .name = MBOCHS_TYPE_1,
1306 .attrs = mdev_types_attrs,
1307};
1308
1309static struct attribute_group mdev_type_group2 = {
1310 .name = MBOCHS_TYPE_2,
1311 .attrs = mdev_types_attrs,
1312};
1313
1314static struct attribute_group mdev_type_group3 = {
1315 .name = MBOCHS_TYPE_3,
1316 .attrs = mdev_types_attrs,
1317};
1318
1319static struct attribute_group *mdev_type_groups[] = {
1320 &mdev_type_group1,
1321 &mdev_type_group2,
1322 &mdev_type_group3,
1323 NULL,
1324};
1325
1326static const struct mdev_parent_ops mdev_fops = {
1327 .owner = THIS_MODULE,
1328 .mdev_attr_groups = mdev_dev_groups,
1329 .supported_type_groups = mdev_type_groups,
1330 .create = mbochs_create,
1331 .remove = mbochs_remove,
1332 .open = mbochs_open,
1333 .release = mbochs_close,
1334 .read = mbochs_read,
1335 .write = mbochs_write,
1336 .ioctl = mbochs_ioctl,
1337 .mmap = mbochs_mmap,
1338};
1339
1340static const struct file_operations vd_fops = {
1341 .owner = THIS_MODULE,
1342};
1343
1344static void mbochs_device_release(struct device *dev)
1345{
1346 /* nothing */
1347}
1348
1349static int __init mbochs_dev_init(void)
1350{
1351 int ret = 0;
1352
1353 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK, MBOCHS_NAME);
1354 if (ret < 0) {
1355 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
1356 return ret;
1357 }
1358 cdev_init(&mbochs_cdev, &vd_fops);
1359 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK);
1360 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
1361
1362 mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
1363 if (IS_ERR(mbochs_class)) {
1364 pr_err("Error: failed to register mbochs_dev class\n");
1365 ret = PTR_ERR(mbochs_class);
1366 goto failed1;
1367 }
1368 mbochs_dev.class = mbochs_class;
1369 mbochs_dev.release = mbochs_device_release;
1370 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME);
1371
1372 ret = device_register(&mbochs_dev);
1373 if (ret)
1374 goto failed2;
1375
1376 ret = mdev_register_device(&mbochs_dev, &mdev_fops);
1377 if (ret)
1378 goto failed3;
1379
1380 return 0;
1381
1382failed3:
1383 device_unregister(&mbochs_dev);
1384failed2:
1385 class_destroy(mbochs_class);
1386failed1:
1387 cdev_del(&mbochs_cdev);
1388 unregister_chrdev_region(mbochs_devt, MINORMASK);
1389 return ret;
1390}
1391
1392static void __exit mbochs_dev_exit(void)
1393{
1394 mbochs_dev.bus = NULL;
1395 mdev_unregister_device(&mbochs_dev);
1396
1397 device_unregister(&mbochs_dev);
1398 cdev_del(&mbochs_cdev);
1399 unregister_chrdev_region(mbochs_devt, MINORMASK);
1400 class_destroy(mbochs_class);
1401 mbochs_class = NULL;
1402}
1403
1404module_init(mbochs_dev_init)
1405module_exit(mbochs_dev_exit)
Linux 6.x block layer and io_uring tree(s)