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