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Merge tag 'clone3-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner...
[linux-2.6-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
104c7405
GH		 74#define MBOCHS_EDID_REGION_INDEX VFIO_PCI_NUM_REGIONS
75#define MBOCHS_NUM_REGIONS (MBOCHS_EDID_REGION_INDEX+1)
76
a5e6e650
GH		 77#define MBOCHS_CONFIG_SPACE_SIZE 0xff
78#define MBOCHS_MMIO_BAR_OFFSET PAGE_SIZE
79#define MBOCHS_MMIO_BAR_SIZE PAGE_SIZE
104c7405 80#define MBOCHS_EDID_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \
a5e6e650 81 MBOCHS_MMIO_BAR_SIZE)
104c7405
GH		 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)
a5e6e650
GH		 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;
104c7405
GH		 106 u32 max_x;
107 u32 max_y;
a5e6e650
GH		 108} mbochs_types[] = {
109 {
110 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1,
111 .mbytes = 4,
104c7405
GH		 112 .max_x = 800,
113 .max_y = 600,
a5e6e650
GH		 114 }, {
115 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2,
116 .mbytes = 16,
104c7405
GH		 117 .max_x = 1920,
118 .max_y = 1440,
a5e6e650
GH		 119 }, {
120 .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3,
121 .mbytes = 64,
104c7405
GH		 122 .max_x = 0,
123 .max_y = 0,
a5e6e650
GH		 124 },
125};
126
127
128static dev_t mbochs_devt;
129static struct class *mbochs_class;
130static struct cdev mbochs_cdev;
131static struct device mbochs_dev;
132static int mbochs_used_mbytes;
133
104c7405
GH		 134struct vfio_region_info_ext {
135 struct vfio_region_info base;
136 struct vfio_region_info_cap_type type;
137};
138
a5e6e650
GH		 139struct 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
150struct 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 */
162struct 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;
a5e6e650
GH		 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;
104c7405
GH		 174 struct vfio_region_gfx_edid edid_regs;
175 u8 edid_blob[0x400];
a5e6e650
GH		 176
177 struct list_head dmabufs;
178 u32 active_id;
179 u32 next_id;
180};
181
182static 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
196static 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
498e8bf5
AK		 203static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
204 pgoff_t pgoff);
a5e6e650
GH		 205static struct page *mbochs_get_page(struct mdev_state *mdev_state,
206 pgoff_t pgoff);
207
208static 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
218static 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
247static 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
294nofb:
295 memset(mode, 0, sizeof(*mode));
296 return -EINVAL;
297}
298
299static 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
305static 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
333static 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:
356unhandled:
357 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
358 __func__, offset, count);
359 break;
360 }
361}
362
363static 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);
104c7405 367 struct vfio_region_gfx_edid *edid;
a5e6e650
GH		 368 u16 reg16 = 0;
369 int index;
370
371 switch (offset) {
104c7405
GH		 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;
a5e6e650
GH		 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:
392unhandled:
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
104c7405
GH		 400static 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
427static 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
a5e6e650
GH		 438static 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 &&
104c7405
GH		 457 pos + count <= (MBOCHS_MMIO_BAR_OFFSET +
458 MBOCHS_MMIO_BAR_SIZE)) {
a5e6e650
GH		 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
104c7405
GH		 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
a5e6e650
GH		 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;
498e8bf5 481 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT);
a5e6e650
GH		 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
500accessfailed:
501 mutex_unlock(&mdev_state->ops_lock);
502
503 return ret;
504}
505
506static 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
519static 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;
104c7405
GH		 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);
a5e6e650
GH		 560 mbochs_create_config_space(mdev_state);
561 mbochs_reset(mdev);
562
563 mbochs_used_mbytes += type->mbytes;
564 return 0;
565
566err_mem:
567 kfree(mdev_state->vconfig);
568 kfree(mdev_state);
569 return -ENOMEM;
570}
571
572static 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
584static 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
639read_err:
640 return -EFAULT;
641}
642
643static 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;
696write_err:
697 return -EFAULT;
698}
699
700static 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
716static 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
731static 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
d7ef4899 748static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf)
a5e6e650
GH		 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
764static const struct vm_operations_struct mbochs_region_vm_ops = {
765 .fault = mbochs_region_vm_fault,
766};
767
768static 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
d7ef4899 786static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf)
a5e6e650
GH		 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
799static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
800 .fault = mbochs_dmabuf_vm_fault,
801};
802
803static 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
818static 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
834static 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_sg(at->dev, sg->sgl, sg->nents, direction))
850 goto err3;
851
852 return sg;
853
854err3:
855 sg_free_table(sg);
856err2:
857 kfree(sg);
858err1:
859 return ERR_PTR(-ENOMEM);
860}
861
862static 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 sg_free_table(sg);
872 kfree(sg);
873}
874
875static void mbochs_release_dmabuf(struct dma_buf *buf)
876{
877 struct mbochs_dmabuf *dmabuf = buf->priv;
878 struct mdev_state *mdev_state = dmabuf->mdev_state;
879 struct device *dev = mdev_dev(mdev_state->mdev);
880 pgoff_t pg;
881
882 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
883
884 for (pg = 0; pg < dmabuf->pagecount; pg++)
885 put_page(dmabuf->pages[pg]);
886
887 mutex_lock(&mdev_state->ops_lock);
888 dmabuf->buf = NULL;
889 if (dmabuf->unlinked)
890 kfree(dmabuf);
891 mutex_unlock(&mdev_state->ops_lock);
892}
893
a5e6e650
GH		 894static void *mbochs_kmap_dmabuf(struct dma_buf *buf, unsigned long page_num)
895{
896 struct mbochs_dmabuf *dmabuf = buf->priv;
897 struct page *page = dmabuf->pages[page_num];
898
899 return kmap(page);
900}
901
7733e05b
GH		 902static void mbochs_kunmap_dmabuf(struct dma_buf *buf, unsigned long page_num,
903 void *vaddr)
904{
905 kunmap(vaddr);
906}
907
a5e6e650
GH		 908static struct dma_buf_ops mbochs_dmabuf_ops = {
909 .map_dma_buf = mbochs_map_dmabuf,
910 .unmap_dma_buf = mbochs_unmap_dmabuf,
911 .release = mbochs_release_dmabuf,
a5e6e650 912 .map = mbochs_kmap_dmabuf,
7733e05b 913 .unmap = mbochs_kunmap_dmabuf,
a5e6e650
GH		 914 .mmap = mbochs_mmap_dmabuf,
915};
916
917static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state,
918 struct mbochs_mode *mode)
919{
920 struct mbochs_dmabuf *dmabuf;
921 pgoff_t page_offset, pg;
922
923 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
924
925 dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL);
926 if (!dmabuf)
927 return NULL;
928
929 dmabuf->mode = *mode;
930 dmabuf->id = mdev_state->next_id++;
931 dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE);
932 dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *),
933 GFP_KERNEL);
934 if (!dmabuf->pages)
935 goto err_free_dmabuf;
936
937 page_offset = dmabuf->mode.offset >> PAGE_SHIFT;
938 for (pg = 0; pg < dmabuf->pagecount; pg++) {
939 dmabuf->pages[pg] = __mbochs_get_page(mdev_state,
940 page_offset + pg);
941 if (!dmabuf->pages[pg])
942 goto err_free_pages;
943 }
944
945 dmabuf->mdev_state = mdev_state;
946 list_add(&dmabuf->next, &mdev_state->dmabufs);
947
948 mbochs_print_dmabuf(dmabuf, __func__);
949 return dmabuf;
950
951err_free_pages:
952 while (pg > 0)
953 put_page(dmabuf->pages[--pg]);
954 kfree(dmabuf->pages);
955err_free_dmabuf:
956 kfree(dmabuf);
957 return NULL;
958}
959
960static struct mbochs_dmabuf *
961mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state,
962 struct mbochs_mode *mode)
963{
964 struct mbochs_dmabuf *dmabuf;
965
966 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
967
968 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
969 if (mbochs_modes_equal(&dmabuf->mode, mode))
970 return dmabuf;
971
972 return NULL;
973}
974
975static struct mbochs_dmabuf *
976mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
977{
978 struct mbochs_dmabuf *dmabuf;
979
980 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
981
982 list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
983 if (dmabuf->id == id)
984 return dmabuf;
985
986 return NULL;
987}
988
989static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
990{
991 struct mdev_state *mdev_state = dmabuf->mdev_state;
992 struct device *dev = mdev_dev(mdev_state->mdev);
993 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
994 struct dma_buf *buf;
995
996 WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
997
998 if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) {
999 dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n",
1000 __func__);
1001 return -EINVAL;
1002 }
1003
1004 exp_info.ops = &mbochs_dmabuf_ops;
1005 exp_info.size = dmabuf->mode.size;
1006 exp_info.priv = dmabuf;
1007
1008 buf = dma_buf_export(&exp_info);
1009 if (IS_ERR(buf)) {
1010 dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n",
1011 __func__, PTR_ERR(buf));
1012 return PTR_ERR(buf);
1013 }
1014
1015 dmabuf->buf = buf;
1016 dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
1017 return 0;
1018}
1019
1020static int mbochs_get_region_info(struct mdev_device *mdev,
104c7405 1021 struct vfio_region_info_ext *ext)
a5e6e650 1022{
104c7405 1023 struct vfio_region_info *region_info = &ext->base;
a5e6e650
GH		 1024 struct mdev_state *mdev_state;
1025
1026 mdev_state = mdev_get_drvdata(mdev);
1027 if (!mdev_state)
1028 return -EINVAL;
1029
104c7405 1030 if (region_info->index >= MBOCHS_NUM_REGIONS)
a5e6e650
GH		 1031 return -EINVAL;
1032
1033 switch (region_info->index) {
1034 case VFIO_PCI_CONFIG_REGION_INDEX:
1035 region_info->offset = 0;
1036 region_info->size = MBOCHS_CONFIG_SPACE_SIZE;
1037 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1038 VFIO_REGION_INFO_FLAG_WRITE);
1039 break;
1040 case VFIO_PCI_BAR0_REGION_INDEX:
1041 region_info->offset = MBOCHS_MEMORY_BAR_OFFSET;
1042 region_info->size = mdev_state->memsize;
1043 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1044 VFIO_REGION_INFO_FLAG_WRITE |
1045 VFIO_REGION_INFO_FLAG_MMAP);
1046 break;
1047 case VFIO_PCI_BAR2_REGION_INDEX:
1048 region_info->offset = MBOCHS_MMIO_BAR_OFFSET;
1049 region_info->size = MBOCHS_MMIO_BAR_SIZE;
1050 region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1051 VFIO_REGION_INFO_FLAG_WRITE);
1052 break;
104c7405
GH		 1053 case MBOCHS_EDID_REGION_INDEX:
1054 ext->base.argsz = sizeof(*ext);
1055 ext->base.offset = MBOCHS_EDID_OFFSET;
1056 ext->base.size = MBOCHS_EDID_SIZE;
1057 ext->base.flags = (VFIO_REGION_INFO_FLAG_READ |
1058 VFIO_REGION_INFO_FLAG_WRITE |
1059 VFIO_REGION_INFO_FLAG_CAPS);
1060 ext->base.cap_offset = offsetof(typeof(*ext), type);
1061 ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE;
1062 ext->type.header.version = 1;
1063 ext->type.header.next = 0;
1064 ext->type.type = VFIO_REGION_TYPE_GFX;
1065 ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID;
1066 break;
a5e6e650
GH		 1067 default:
1068 region_info->size = 0;
1069 region_info->offset = 0;
1070 region_info->flags = 0;
1071 }
1072
1073 return 0;
1074}
1075
1076static int mbochs_get_irq_info(struct mdev_device *mdev,
1077 struct vfio_irq_info *irq_info)
1078{
1079 irq_info->count = 0;
1080 return 0;
1081}
1082
1083static int mbochs_get_device_info(struct mdev_device *mdev,
1084 struct vfio_device_info *dev_info)
1085{
1086 dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
104c7405 1087 dev_info->num_regions = MBOCHS_NUM_REGIONS;
a5e6e650
GH		 1088 dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
1089 return 0;
1090}
1091
1092static int mbochs_query_gfx_plane(struct mdev_device *mdev,
1093 struct vfio_device_gfx_plane_info *plane)
1094{
1095 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1096 struct device *dev = mdev_dev(mdev);
1097 struct mbochs_dmabuf *dmabuf;
1098 struct mbochs_mode mode;
1099 int ret;
1100
1101 if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
1102 if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
1103 VFIO_GFX_PLANE_TYPE_DMABUF))
1104 return 0;
1105 return -EINVAL;
1106 }
1107
1108 if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF)
1109 return -EINVAL;
1110
1111 plane->drm_format_mod = 0;
1112 plane->x_pos = 0;
1113 plane->y_pos = 0;
1114 plane->x_hot = 0;
1115 plane->y_hot = 0;
1116
1117 mutex_lock(&mdev_state->ops_lock);
1118
1119 ret = -EINVAL;
1120 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY)
1121 ret = mbochs_check_framebuffer(mdev_state, &mode);
1122 if (ret < 0) {
1123 plane->drm_format = 0;
1124 plane->width = 0;
1125 plane->height = 0;
1126 plane->stride = 0;
1127 plane->size = 0;
1128 plane->dmabuf_id = 0;
1129 goto done;
1130 }
1131
1132 dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode);
1133 if (!dmabuf)
1134 mbochs_dmabuf_alloc(mdev_state, &mode);
1135 if (!dmabuf) {
1136 mutex_unlock(&mdev_state->ops_lock);
1137 return -ENOMEM;
1138 }
1139
1140 plane->drm_format = dmabuf->mode.drm_format;
1141 plane->width = dmabuf->mode.width;
1142 plane->height = dmabuf->mode.height;
1143 plane->stride = dmabuf->mode.stride;
1144 plane->size = dmabuf->mode.size;
1145 plane->dmabuf_id = dmabuf->id;
1146
1147done:
1148 if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY &&
1149 mdev_state->active_id != plane->dmabuf_id) {
1150 dev_dbg(dev, "%s: primary: %d => %d\n", __func__,
1151 mdev_state->active_id, plane->dmabuf_id);
1152 mdev_state->active_id = plane->dmabuf_id;
1153 }
1154 mutex_unlock(&mdev_state->ops_lock);
1155 return 0;
1156}
1157
1158static int mbochs_get_gfx_dmabuf(struct mdev_device *mdev,
1159 u32 id)
1160{
1161 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1162 struct mbochs_dmabuf *dmabuf;
1163
1164 mutex_lock(&mdev_state->ops_lock);
1165
1166 dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id);
1167 if (!dmabuf) {
1168 mutex_unlock(&mdev_state->ops_lock);
1169 return -ENOENT;
1170 }
1171
1172 if (!dmabuf->buf)
1173 mbochs_dmabuf_export(dmabuf);
1174
1175 mutex_unlock(&mdev_state->ops_lock);
1176
1177 if (!dmabuf->buf)
1178 return -EINVAL;
1179
1180 return dma_buf_fd(dmabuf->buf, 0);
1181}
1182
1183static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
1184 unsigned long arg)
1185{
1186 int ret = 0;
104c7405 1187 unsigned long minsz, outsz;
a5e6e650
GH		 1188 struct mdev_state *mdev_state;
1189
1190 mdev_state = mdev_get_drvdata(mdev);
1191
1192 switch (cmd) {
1193 case VFIO_DEVICE_GET_INFO:
1194 {
1195 struct vfio_device_info info;
1196
1197 minsz = offsetofend(struct vfio_device_info, num_irqs);
1198
1199 if (copy_from_user(&info, (void __user *)arg, minsz))
1200 return -EFAULT;
1201
1202 if (info.argsz < minsz)
1203 return -EINVAL;
1204
1205 ret = mbochs_get_device_info(mdev, &info);
1206 if (ret)
1207 return ret;
1208
a5e6e650
GH		 1209 if (copy_to_user((void __user *)arg, &info, minsz))
1210 return -EFAULT;
1211
1212 return 0;
1213 }
1214 case VFIO_DEVICE_GET_REGION_INFO:
1215 {
104c7405 1216 struct vfio_region_info_ext info;
a5e6e650 1217
104c7405 1218 minsz = offsetofend(typeof(info), base.offset);
a5e6e650
GH		 1219
1220 if (copy_from_user(&info, (void __user *)arg, minsz))
1221 return -EFAULT;
1222
104c7405
GH		 1223 outsz = info.base.argsz;
1224 if (outsz < minsz)
1225 return -EINVAL;
1226 if (outsz > sizeof(info))
a5e6e650
GH		 1227 return -EINVAL;
1228
104c7405 1229 ret = mbochs_get_region_info(mdev, &info);
a5e6e650
GH		 1230 if (ret)
1231 return ret;
1232
104c7405 1233 if (copy_to_user((void __user *)arg, &info, outsz))
a5e6e650
GH		 1234 return -EFAULT;
1235
1236 return 0;
1237 }
1238
1239 case VFIO_DEVICE_GET_IRQ_INFO:
1240 {
1241 struct vfio_irq_info info;
1242
1243 minsz = offsetofend(struct vfio_irq_info, count);
1244
1245 if (copy_from_user(&info, (void __user *)arg, minsz))
1246 return -EFAULT;
1247
1248 if ((info.argsz < minsz) ||
104c7405 1249 (info.index >= VFIO_PCI_NUM_IRQS))
a5e6e650
GH		 1250 return -EINVAL;
1251
1252 ret = mbochs_get_irq_info(mdev, &info);
1253 if (ret)
1254 return ret;
1255
1256 if (copy_to_user((void __user *)arg, &info, minsz))
1257 return -EFAULT;
1258
1259 return 0;
1260 }
1261
1262 case VFIO_DEVICE_QUERY_GFX_PLANE:
1263 {
1264 struct vfio_device_gfx_plane_info plane;
1265
1266 minsz = offsetofend(struct vfio_device_gfx_plane_info,
1267 region_index);
1268
1269 if (copy_from_user(&plane, (void __user *)arg, minsz))
1270 return -EFAULT;
1271
1272 if (plane.argsz < minsz)
1273 return -EINVAL;
1274
1275 ret = mbochs_query_gfx_plane(mdev, &plane);
1276 if (ret)
1277 return ret;
1278
1279 if (copy_to_user((void __user *)arg, &plane, minsz))
1280 return -EFAULT;
1281
1282 return 0;
1283 }
1284
1285 case VFIO_DEVICE_GET_GFX_DMABUF:
1286 {
1287 u32 dmabuf_id;
1288
1289 if (get_user(dmabuf_id, (__u32 __user *)arg))
1290 return -EFAULT;
1291
1292 return mbochs_get_gfx_dmabuf(mdev, dmabuf_id);
1293 }
1294
1295 case VFIO_DEVICE_SET_IRQS:
1296 return -EINVAL;
1297
1298 case VFIO_DEVICE_RESET:
1299 return mbochs_reset(mdev);
1300 }
1301 return -ENOTTY;
1302}
1303
1304static int mbochs_open(struct mdev_device *mdev)
1305{
1306 if (!try_module_get(THIS_MODULE))
1307 return -ENODEV;
1308
1309 return 0;
1310}
1311
1312static void mbochs_close(struct mdev_device *mdev)
1313{
1314 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1315 struct mbochs_dmabuf *dmabuf, *tmp;
1316
1317 mutex_lock(&mdev_state->ops_lock);
1318
1319 list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) {
1320 list_del(&dmabuf->next);
1321 if (dmabuf->buf) {
1322 /* free in mbochs_release_dmabuf() */
1323 dmabuf->unlinked = true;
1324 } else {
1325 kfree(dmabuf);
1326 }
1327 }
1328 mbochs_put_pages(mdev_state);
1329
1330 mutex_unlock(&mdev_state->ops_lock);
1331 module_put(THIS_MODULE);
1332}
1333
1334static ssize_t
1335memory_show(struct device *dev, struct device_attribute *attr,
1336 char *buf)
1337{
1338 struct mdev_device *mdev = mdev_from_dev(dev);
1339 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
1340
1341 return sprintf(buf, "%d MB\n", mdev_state->type->mbytes);
1342}
1343static DEVICE_ATTR_RO(memory);
1344
1345static struct attribute *mdev_dev_attrs[] = {
1346 &dev_attr_memory.attr,
1347 NULL,
1348};
1349
1350static const struct attribute_group mdev_dev_group = {
1351 .name = "vendor",
1352 .attrs = mdev_dev_attrs,
1353};
1354
1355const struct attribute_group *mdev_dev_groups[] = {
1356 &mdev_dev_group,
1357 NULL,
1358};
1359
1360static ssize_t
1361name_show(struct kobject *kobj, struct device *dev, char *buf)
1362{
1363 return sprintf(buf, "%s\n", kobj->name);
1364}
1365MDEV_TYPE_ATTR_RO(name);
1366
1367static ssize_t
1368description_show(struct kobject *kobj, struct device *dev, char *buf)
1369{
1370 const struct mbochs_type *type = mbochs_find_type(kobj);
1371
1372 return sprintf(buf, "virtual display, %d MB video memory\n",
1373 type ? type->mbytes : 0);
1374}
1375MDEV_TYPE_ATTR_RO(description);
1376
1377static ssize_t
1378available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
1379{
1380 const struct mbochs_type *type = mbochs_find_type(kobj);
1381 int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
1382
1383 return sprintf(buf, "%d\n", count);
1384}
1385MDEV_TYPE_ATTR_RO(available_instances);
1386
1387static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
1388 char *buf)
1389{
1390 return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
1391}
1392MDEV_TYPE_ATTR_RO(device_api);
1393
1394static struct attribute *mdev_types_attrs[] = {
1395 &mdev_type_attr_name.attr,
1396 &mdev_type_attr_description.attr,
1397 &mdev_type_attr_device_api.attr,
1398 &mdev_type_attr_available_instances.attr,
1399 NULL,
1400};
1401
1402static struct attribute_group mdev_type_group1 = {
1403 .name = MBOCHS_TYPE_1,
1404 .attrs = mdev_types_attrs,
1405};
1406
1407static struct attribute_group mdev_type_group2 = {
1408 .name = MBOCHS_TYPE_2,
1409 .attrs = mdev_types_attrs,
1410};
1411
1412static struct attribute_group mdev_type_group3 = {
1413 .name = MBOCHS_TYPE_3,
1414 .attrs = mdev_types_attrs,
1415};
1416
1417static struct attribute_group *mdev_type_groups[] = {
1418 &mdev_type_group1,
1419 &mdev_type_group2,
1420 &mdev_type_group3,
1421 NULL,
1422};
1423
1424static const struct mdev_parent_ops mdev_fops = {
1425 .owner = THIS_MODULE,
1426 .mdev_attr_groups = mdev_dev_groups,
1427 .supported_type_groups = mdev_type_groups,
1428 .create = mbochs_create,
1429 .remove = mbochs_remove,
1430 .open = mbochs_open,
1431 .release = mbochs_close,
1432 .read = mbochs_read,
1433 .write = mbochs_write,
1434 .ioctl = mbochs_ioctl,
1435 .mmap = mbochs_mmap,
1436};
1437
1438static const struct file_operations vd_fops = {
1439 .owner = THIS_MODULE,
1440};
1441
1442static void mbochs_device_release(struct device *dev)
1443{
1444 /* nothing */
1445}
1446
1447static int __init mbochs_dev_init(void)
1448{
1449 int ret = 0;
1450
16355214 1451 ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
a5e6e650
GH		 1452 if (ret < 0) {
1453 pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
1454 return ret;
1455 }
1456 cdev_init(&mbochs_cdev, &vd_fops);
16355214 1457 cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
a5e6e650
GH		 1458 pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
1459
1460 mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
1461 if (IS_ERR(mbochs_class)) {
1462 pr_err("Error: failed to register mbochs_dev class\n");
1463 ret = PTR_ERR(mbochs_class);
1464 goto failed1;
1465 }
1466 mbochs_dev.class = mbochs_class;
1467 mbochs_dev.release = mbochs_device_release;
1468 dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME);
1469
1470 ret = device_register(&mbochs_dev);
1471 if (ret)
1472 goto failed2;
1473
1474 ret = mdev_register_device(&mbochs_dev, &mdev_fops);
1475 if (ret)
1476 goto failed3;
1477
1478 return 0;
1479
1480failed3:
1481 device_unregister(&mbochs_dev);
1482failed2:
1483 class_destroy(mbochs_class);
1484failed1:
1485 cdev_del(&mbochs_cdev);
16355214 1486 unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
a5e6e650
GH		 1487 return ret;
1488}
1489
1490static void __exit mbochs_dev_exit(void)
1491{
1492 mbochs_dev.bus = NULL;
1493 mdev_unregister_device(&mbochs_dev);
1494
1495 device_unregister(&mbochs_dev);
1496 cdev_del(&mbochs_cdev);
16355214 1497 unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
a5e6e650
GH		 1498 class_destroy(mbochs_class);
1499 mbochs_class = NULL;
1500}
1501
1502module_init(mbochs_dev_init)
1503module_exit(mbochs_dev_exit)
Linux 6.x block layer and io_uring tree(s)