vfio: add edid support to mbochs sample driver
[sfrench/cifs-2.6.git] / samples / vfio-mdev / mbochs.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Mediated virtual PCI display host device driver
4  *
5  * Emulate enough of qemu stdvga to make bochs-drm.ko happy.  That is
6  * basically the vram memory bar and the bochs dispi interface vbe
7  * registers in the mmio register bar.  Specifically it does *not*
8  * include any legacy vga stuff.  Device looks a lot like "qemu -device
9  * secondary-vga".
10  *
11  *   (c) Gerd Hoffmann <kraxel@redhat.com>
12  *
13  * based on mtty driver which is:
14  *   Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
15  *       Author: Neo Jia <cjia@nvidia.com>
16  *               Kirti Wankhede <kwankhede@nvidia.com>
17  *
18  * This program is free software; you can redistribute it and/or modify
19  * it under the terms of the GNU General Public License version 2 as
20  * published by the Free Software Foundation.
21  */
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/device.h>
25 #include <linux/kernel.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/cdev.h>
29 #include <linux/vfio.h>
30 #include <linux/iommu.h>
31 #include <linux/sysfs.h>
32 #include <linux/mdev.h>
33 #include <linux/pci.h>
34 #include <linux/dma-buf.h>
35 #include <linux/highmem.h>
36 #include <drm/drm_fourcc.h>
37 #include <drm/drm_rect.h>
38 #include <drm/drm_modeset_lock.h>
39 #include <drm/drm_property.h>
40 #include <drm/drm_plane.h>
41
42
43 #define VBE_DISPI_INDEX_ID              0x0
44 #define VBE_DISPI_INDEX_XRES            0x1
45 #define VBE_DISPI_INDEX_YRES            0x2
46 #define VBE_DISPI_INDEX_BPP             0x3
47 #define VBE_DISPI_INDEX_ENABLE          0x4
48 #define VBE_DISPI_INDEX_BANK            0x5
49 #define VBE_DISPI_INDEX_VIRT_WIDTH      0x6
50 #define VBE_DISPI_INDEX_VIRT_HEIGHT     0x7
51 #define VBE_DISPI_INDEX_X_OFFSET        0x8
52 #define VBE_DISPI_INDEX_Y_OFFSET        0x9
53 #define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa
54 #define VBE_DISPI_INDEX_COUNT           0xb
55
56 #define VBE_DISPI_ID0                   0xB0C0
57 #define VBE_DISPI_ID1                   0xB0C1
58 #define VBE_DISPI_ID2                   0xB0C2
59 #define VBE_DISPI_ID3                   0xB0C3
60 #define VBE_DISPI_ID4                   0xB0C4
61 #define VBE_DISPI_ID5                   0xB0C5
62
63 #define VBE_DISPI_DISABLED              0x00
64 #define VBE_DISPI_ENABLED               0x01
65 #define VBE_DISPI_GETCAPS               0x02
66 #define VBE_DISPI_8BIT_DAC              0x20
67 #define VBE_DISPI_LFB_ENABLED           0x40
68 #define VBE_DISPI_NOCLEARMEM            0x80
69
70
71 #define MBOCHS_NAME               "mbochs"
72 #define MBOCHS_CLASS_NAME         "mbochs"
73
74 #define MBOCHS_EDID_REGION_INDEX  VFIO_PCI_NUM_REGIONS
75 #define MBOCHS_NUM_REGIONS        (MBOCHS_EDID_REGION_INDEX+1)
76
77 #define MBOCHS_CONFIG_SPACE_SIZE  0xff
78 #define MBOCHS_MMIO_BAR_OFFSET    PAGE_SIZE
79 #define MBOCHS_MMIO_BAR_SIZE      PAGE_SIZE
80 #define MBOCHS_EDID_OFFSET        (MBOCHS_MMIO_BAR_OFFSET +     \
81                                    MBOCHS_MMIO_BAR_SIZE)
82 #define MBOCHS_EDID_SIZE          PAGE_SIZE
83 #define MBOCHS_MEMORY_BAR_OFFSET  (MBOCHS_EDID_OFFSET + \
84                                    MBOCHS_EDID_SIZE)
85
86 #define MBOCHS_EDID_BLOB_OFFSET   (MBOCHS_EDID_SIZE/2)
87
88 #define STORE_LE16(addr, val)   (*(u16 *)addr = val)
89 #define STORE_LE32(addr, val)   (*(u32 *)addr = val)
90
91
92 MODULE_LICENSE("GPL v2");
93
94 static int max_mbytes = 256;
95 module_param_named(count, max_mbytes, int, 0444);
96 MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices");
97
98
99 #define MBOCHS_TYPE_1 "small"
100 #define MBOCHS_TYPE_2 "medium"
101 #define MBOCHS_TYPE_3 "large"
102
103 static const struct mbochs_type {
104         const char *name;
105         u32 mbytes;
106         u32 max_x;
107         u32 max_y;
108 } mbochs_types[] = {
109         {
110                 .name   = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1,
111                 .mbytes = 4,
112                 .max_x  = 800,
113                 .max_y  = 600,
114         }, {
115                 .name   = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2,
116                 .mbytes = 16,
117                 .max_x  = 1920,
118                 .max_y  = 1440,
119         }, {
120                 .name   = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3,
121                 .mbytes = 64,
122                 .max_x  = 0,
123                 .max_y  = 0,
124         },
125 };
126
127
128 static dev_t            mbochs_devt;
129 static struct class     *mbochs_class;
130 static struct cdev      mbochs_cdev;
131 static struct device    mbochs_dev;
132 static int              mbochs_used_mbytes;
133
134 struct vfio_region_info_ext {
135         struct vfio_region_info          base;
136         struct vfio_region_info_cap_type type;
137 };
138
139 struct mbochs_mode {
140         u32 drm_format;
141         u32 bytepp;
142         u32 width;
143         u32 height;
144         u32 stride;
145         u32 __pad;
146         u64 offset;
147         u64 size;
148 };
149
150 struct mbochs_dmabuf {
151         struct mbochs_mode mode;
152         u32 id;
153         struct page **pages;
154         pgoff_t pagecount;
155         struct dma_buf *buf;
156         struct mdev_state *mdev_state;
157         struct list_head next;
158         bool unlinked;
159 };
160
161 /* State of each mdev device */
162 struct mdev_state {
163         u8 *vconfig;
164         u64 bar_mask[3];
165         u32 memory_bar_mask;
166         struct mutex ops_lock;
167         struct mdev_device *mdev;
168
169         const struct mbochs_type *type;
170         u16 vbe[VBE_DISPI_INDEX_COUNT];
171         u64 memsize;
172         struct page **pages;
173         pgoff_t pagecount;
174         struct vfio_region_gfx_edid edid_regs;
175         u8 edid_blob[0x400];
176
177         struct list_head dmabufs;
178         u32 active_id;
179         u32 next_id;
180 };
181
182 static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = {
183         [VBE_DISPI_INDEX_ID]               = "id",
184         [VBE_DISPI_INDEX_XRES]             = "xres",
185         [VBE_DISPI_INDEX_YRES]             = "yres",
186         [VBE_DISPI_INDEX_BPP]              = "bpp",
187         [VBE_DISPI_INDEX_ENABLE]           = "enable",
188         [VBE_DISPI_INDEX_BANK]             = "bank",
189         [VBE_DISPI_INDEX_VIRT_WIDTH]       = "virt-width",
190         [VBE_DISPI_INDEX_VIRT_HEIGHT]      = "virt-height",
191         [VBE_DISPI_INDEX_X_OFFSET]         = "x-offset",
192         [VBE_DISPI_INDEX_Y_OFFSET]         = "y-offset",
193         [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem",
194 };
195
196 static const char *vbe_name(u32 index)
197 {
198         if (index < ARRAY_SIZE(vbe_name_list))
199                 return vbe_name_list[index];
200         return "(invalid)";
201 }
202
203 static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
204                                       pgoff_t pgoff);
205 static struct page *mbochs_get_page(struct mdev_state *mdev_state,
206                                     pgoff_t pgoff);
207
208 static const struct mbochs_type *mbochs_find_type(struct kobject *kobj)
209 {
210         int i;
211
212         for (i = 0; i < ARRAY_SIZE(mbochs_types); i++)
213                 if (strcmp(mbochs_types[i].name, kobj->name) == 0)
214                         return mbochs_types + i;
215         return NULL;
216 }
217
218 static void mbochs_create_config_space(struct mdev_state *mdev_state)
219 {
220         STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID],
221                    0x1234);
222         STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID],
223                    0x1111);
224         STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID],
225                    PCI_SUBVENDOR_ID_REDHAT_QUMRANET);
226         STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID],
227                    PCI_SUBDEVICE_ID_QEMU);
228
229         STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND],
230                    PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
231         STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE],
232                    PCI_CLASS_DISPLAY_OTHER);
233         mdev_state->vconfig[PCI_CLASS_REVISION] =  0x01;
234
235         STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0],
236                    PCI_BASE_ADDRESS_SPACE_MEMORY |
237                    PCI_BASE_ADDRESS_MEM_TYPE_32  |
238                    PCI_BASE_ADDRESS_MEM_PREFETCH);
239         mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1;
240
241         STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2],
242                    PCI_BASE_ADDRESS_SPACE_MEMORY |
243                    PCI_BASE_ADDRESS_MEM_TYPE_32);
244         mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1;
245 }
246
247 static int mbochs_check_framebuffer(struct mdev_state *mdev_state,
248                                     struct mbochs_mode *mode)
249 {
250         struct device *dev = mdev_dev(mdev_state->mdev);
251         u16 *vbe = mdev_state->vbe;
252         u32 virt_width;
253
254         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
255
256         if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED))
257                 goto nofb;
258
259         memset(mode, 0, sizeof(*mode));
260         switch (vbe[VBE_DISPI_INDEX_BPP]) {
261         case 32:
262                 mode->drm_format = DRM_FORMAT_XRGB8888;
263                 mode->bytepp = 4;
264                 break;
265         default:
266                 dev_info_ratelimited(dev, "%s: bpp %d not supported\n",
267                                      __func__, vbe[VBE_DISPI_INDEX_BPP]);
268                 goto nofb;
269         }
270
271         mode->width  = vbe[VBE_DISPI_INDEX_XRES];
272         mode->height = vbe[VBE_DISPI_INDEX_YRES];
273         virt_width  = vbe[VBE_DISPI_INDEX_VIRT_WIDTH];
274         if (virt_width < mode->width)
275                 virt_width = mode->width;
276         mode->stride = virt_width * mode->bytepp;
277         mode->size   = (u64)mode->stride * mode->height;
278         mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp +
279                        (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride);
280
281         if (mode->width < 64 || mode->height < 64) {
282                 dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n",
283                                      __func__, mode->width, mode->height);
284                 goto nofb;
285         }
286         if (mode->offset + mode->size > mdev_state->memsize) {
287                 dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n",
288                                      __func__);
289                 goto nofb;
290         }
291
292         return 0;
293
294 nofb:
295         memset(mode, 0, sizeof(*mode));
296         return -EINVAL;
297 }
298
299 static bool mbochs_modes_equal(struct mbochs_mode *mode1,
300                                struct mbochs_mode *mode2)
301 {
302         return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0;
303 }
304
305 static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
306                                  char *buf, u32 count)
307 {
308         struct device *dev = mdev_dev(mdev_state->mdev);
309         int index = (offset - PCI_BASE_ADDRESS_0) / 0x04;
310         u32 cfg_addr;
311
312         switch (offset) {
313         case PCI_BASE_ADDRESS_0:
314         case PCI_BASE_ADDRESS_2:
315                 cfg_addr = *(u32 *)buf;
316
317                 if (cfg_addr == 0xffffffff) {
318                         cfg_addr = (cfg_addr & mdev_state->bar_mask[index]);
319                 } else {
320                         cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK;
321                         if (cfg_addr)
322                                 dev_info(dev, "BAR #%d @ 0x%x\n",
323                                          index, cfg_addr);
324                 }
325
326                 cfg_addr |= (mdev_state->vconfig[offset] &
327                              ~PCI_BASE_ADDRESS_MEM_MASK);
328                 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr);
329                 break;
330         }
331 }
332
333 static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset,
334                               char *buf, u32 count)
335 {
336         struct device *dev = mdev_dev(mdev_state->mdev);
337         int index;
338         u16 reg16;
339
340         switch (offset) {
341         case 0x400 ... 0x41f: /* vga ioports remapped */
342                 goto unhandled;
343         case 0x500 ... 0x515: /* bochs dispi interface */
344                 if (count != 2)
345                         goto unhandled;
346                 index = (offset - 0x500) / 2;
347                 reg16 = *(u16 *)buf;
348                 if (index < ARRAY_SIZE(mdev_state->vbe))
349                         mdev_state->vbe[index] = reg16;
350                 dev_dbg(dev, "%s: vbe write %d = %d (%s)\n",
351                         __func__, index, reg16, vbe_name(index));
352                 break;
353         case 0x600 ... 0x607: /* qemu extended regs */
354                 goto unhandled;
355         default:
356 unhandled:
357                 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
358                         __func__, offset, count);
359                 break;
360         }
361 }
362
363 static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset,
364                              char *buf, u32 count)
365 {
366         struct device *dev = mdev_dev(mdev_state->mdev);
367         struct vfio_region_gfx_edid *edid;
368         u16 reg16 = 0;
369         int index;
370
371         switch (offset) {
372         case 0x000 ... 0x3ff: /* edid block */
373                 edid = &mdev_state->edid_regs;
374                 if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP ||
375                     offset >= edid->edid_size) {
376                         memset(buf, 0, count);
377                         break;
378                 }
379                 memcpy(buf, mdev_state->edid_blob + offset, count);
380                 break;
381         case 0x500 ... 0x515: /* bochs dispi interface */
382                 if (count != 2)
383                         goto unhandled;
384                 index = (offset - 0x500) / 2;
385                 if (index < ARRAY_SIZE(mdev_state->vbe))
386                         reg16 = mdev_state->vbe[index];
387                 dev_dbg(dev, "%s: vbe read %d = %d (%s)\n",
388                         __func__, index, reg16, vbe_name(index));
389                 *(u16 *)buf = reg16;
390                 break;
391         default:
392 unhandled:
393                 dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n",
394                         __func__, offset, count);
395                 memset(buf, 0, count);
396                 break;
397         }
398 }
399
400 static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset,
401                              char *buf, u32 count, bool is_write)
402 {
403         char *regs = (void *)&mdev_state->edid_regs;
404
405         if (offset + count > sizeof(mdev_state->edid_regs))
406                 return;
407         if (count != 4)
408                 return;
409         if (offset % 4)
410                 return;
411
412         if (is_write) {
413                 switch (offset) {
414                 case offsetof(struct vfio_region_gfx_edid, link_state):
415                 case offsetof(struct vfio_region_gfx_edid, edid_size):
416                         memcpy(regs + offset, buf, count);
417                         break;
418                 default:
419                         /* read-only regs */
420                         break;
421                 }
422         } else {
423                 memcpy(buf, regs + offset, count);
424         }
425 }
426
427 static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset,
428                              char *buf, u32 count, bool is_write)
429 {
430         if (offset + count > mdev_state->edid_regs.edid_max_size)
431                 return;
432         if (is_write)
433                 memcpy(mdev_state->edid_blob + offset, buf, count);
434         else
435                 memcpy(buf, mdev_state->edid_blob + offset, count);
436 }
437
438 static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
439                            loff_t pos, bool is_write)
440 {
441         struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
442         struct device *dev = mdev_dev(mdev);
443         struct page *pg;
444         loff_t poff;
445         char *map;
446         int ret = 0;
447
448         mutex_lock(&mdev_state->ops_lock);
449
450         if (pos < MBOCHS_CONFIG_SPACE_SIZE) {
451                 if (is_write)
452                         handle_pci_cfg_write(mdev_state, pos, buf, count);
453                 else
454                         memcpy(buf, (mdev_state->vconfig + pos), count);
455
456         } else if (pos >= MBOCHS_MMIO_BAR_OFFSET &&
457                    pos + count <= (MBOCHS_MMIO_BAR_OFFSET +
458                                    MBOCHS_MMIO_BAR_SIZE)) {
459                 pos -= MBOCHS_MMIO_BAR_OFFSET;
460                 if (is_write)
461                         handle_mmio_write(mdev_state, pos, buf, count);
462                 else
463                         handle_mmio_read(mdev_state, pos, buf, count);
464
465         } else if (pos >= MBOCHS_EDID_OFFSET &&
466                    pos + count <= (MBOCHS_EDID_OFFSET +
467                                    MBOCHS_EDID_SIZE)) {
468                 pos -= MBOCHS_EDID_OFFSET;
469                 if (pos < MBOCHS_EDID_BLOB_OFFSET) {
470                         handle_edid_regs(mdev_state, pos, buf, count, is_write);
471                 } else {
472                         pos -= MBOCHS_EDID_BLOB_OFFSET;
473                         handle_edid_blob(mdev_state, pos, buf, count, is_write);
474                 }
475
476         } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET &&
477                    pos + count <=
478                    MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) {
479                 pos -= MBOCHS_MMIO_BAR_OFFSET;
480                 poff = pos & ~PAGE_MASK;
481                 pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT);
482                 map = kmap(pg);
483                 if (is_write)
484                         memcpy(map + poff, buf, count);
485                 else
486                         memcpy(buf, map + poff, count);
487                 kunmap(pg);
488                 put_page(pg);
489
490         } else {
491                 dev_dbg(dev, "%s: %s @0x%llx (unhandled)\n",
492                         __func__, is_write ? "WR" : "RD", pos);
493                 ret = -1;
494                 goto accessfailed;
495         }
496
497         ret = count;
498
499
500 accessfailed:
501         mutex_unlock(&mdev_state->ops_lock);
502
503         return ret;
504 }
505
506 static int mbochs_reset(struct mdev_device *mdev)
507 {
508         struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
509         u32 size64k = mdev_state->memsize / (64 * 1024);
510         int i;
511
512         for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++)
513                 mdev_state->vbe[i] = 0;
514         mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5;
515         mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k;
516         return 0;
517 }
518
519 static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
520 {
521         const struct mbochs_type *type = mbochs_find_type(kobj);
522         struct device *dev = mdev_dev(mdev);
523         struct mdev_state *mdev_state;
524
525         if (!type)
526                 type = &mbochs_types[0];
527         if (type->mbytes + mbochs_used_mbytes > max_mbytes)
528                 return -ENOMEM;
529
530         mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
531         if (mdev_state == NULL)
532                 return -ENOMEM;
533
534         mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
535         if (mdev_state->vconfig == NULL)
536                 goto err_mem;
537
538         mdev_state->memsize = type->mbytes * 1024 * 1024;
539         mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT;
540         mdev_state->pages = kcalloc(mdev_state->pagecount,
541                                     sizeof(struct page *),
542                                     GFP_KERNEL);
543         if (!mdev_state->pages)
544                 goto err_mem;
545
546         dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__,
547                  kobj->name, type->mbytes, mdev_state->pagecount);
548
549         mutex_init(&mdev_state->ops_lock);
550         mdev_state->mdev = mdev;
551         mdev_set_drvdata(mdev, mdev_state);
552         INIT_LIST_HEAD(&mdev_state->dmabufs);
553         mdev_state->next_id = 1;
554
555         mdev_state->type = type;
556         mdev_state->edid_regs.max_xres = type->max_x;
557         mdev_state->edid_regs.max_yres = type->max_y;
558         mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET;
559         mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob);
560         mbochs_create_config_space(mdev_state);
561         mbochs_reset(mdev);
562
563         mbochs_used_mbytes += type->mbytes;
564         return 0;
565
566 err_mem:
567         kfree(mdev_state->vconfig);
568         kfree(mdev_state);
569         return -ENOMEM;
570 }
571
572 static int mbochs_remove(struct mdev_device *mdev)
573 {
574         struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
575
576         mbochs_used_mbytes -= mdev_state->type->mbytes;
577         mdev_set_drvdata(mdev, NULL);
578         kfree(mdev_state->pages);
579         kfree(mdev_state->vconfig);
580         kfree(mdev_state);
581         return 0;
582 }
583
584 static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf,
585                            size_t count, loff_t *ppos)
586 {
587         unsigned int done = 0;
588         int ret;
589
590         while (count) {
591                 size_t filled;
592
593                 if (count >= 4 && !(*ppos % 4)) {
594                         u32 val;
595
596                         ret =  mdev_access(mdev, (char *)&val, sizeof(val),
597                                            *ppos, false);
598                         if (ret <= 0)
599                                 goto read_err;
600
601                         if (copy_to_user(buf, &val, sizeof(val)))
602                                 goto read_err;
603
604                         filled = 4;
605                 } else if (count >= 2 && !(*ppos % 2)) {
606                         u16 val;
607
608                         ret = mdev_access(mdev, (char *)&val, sizeof(val),
609                                           *ppos, false);
610                         if (ret <= 0)
611                                 goto read_err;
612
613                         if (copy_to_user(buf, &val, sizeof(val)))
614                                 goto read_err;
615
616                         filled = 2;
617                 } else {
618                         u8 val;
619
620                         ret = mdev_access(mdev, (char *)&val, sizeof(val),
621                                           *ppos, false);
622                         if (ret <= 0)
623                                 goto read_err;
624
625                         if (copy_to_user(buf, &val, sizeof(val)))
626                                 goto read_err;
627
628                         filled = 1;
629                 }
630
631                 count -= filled;
632                 done += filled;
633                 *ppos += filled;
634                 buf += filled;
635         }
636
637         return done;
638
639 read_err:
640         return -EFAULT;
641 }
642
643 static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf,
644                             size_t count, loff_t *ppos)
645 {
646         unsigned int done = 0;
647         int ret;
648
649         while (count) {
650                 size_t filled;
651
652                 if (count >= 4 && !(*ppos % 4)) {
653                         u32 val;
654
655                         if (copy_from_user(&val, buf, sizeof(val)))
656                                 goto write_err;
657
658                         ret = mdev_access(mdev, (char *)&val, sizeof(val),
659                                           *ppos, true);
660                         if (ret <= 0)
661                                 goto write_err;
662
663                         filled = 4;
664                 } else if (count >= 2 && !(*ppos % 2)) {
665                         u16 val;
666
667                         if (copy_from_user(&val, buf, sizeof(val)))
668                                 goto write_err;
669
670                         ret = mdev_access(mdev, (char *)&val, sizeof(val),
671                                           *ppos, true);
672                         if (ret <= 0)
673                                 goto write_err;
674
675                         filled = 2;
676                 } else {
677                         u8 val;
678
679                         if (copy_from_user(&val, buf, sizeof(val)))
680                                 goto write_err;
681
682                         ret = mdev_access(mdev, (char *)&val, sizeof(val),
683                                           *ppos, true);
684                         if (ret <= 0)
685                                 goto write_err;
686
687                         filled = 1;
688                 }
689                 count -= filled;
690                 done += filled;
691                 *ppos += filled;
692                 buf += filled;
693         }
694
695         return done;
696 write_err:
697         return -EFAULT;
698 }
699
700 static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
701                                       pgoff_t pgoff)
702 {
703         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
704
705         if (!mdev_state->pages[pgoff]) {
706                 mdev_state->pages[pgoff] =
707                         alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0);
708                 if (!mdev_state->pages[pgoff])
709                         return NULL;
710         }
711
712         get_page(mdev_state->pages[pgoff]);
713         return mdev_state->pages[pgoff];
714 }
715
716 static struct page *mbochs_get_page(struct mdev_state *mdev_state,
717                                     pgoff_t pgoff)
718 {
719         struct page *page;
720
721         if (WARN_ON(pgoff >= mdev_state->pagecount))
722                 return NULL;
723
724         mutex_lock(&mdev_state->ops_lock);
725         page = __mbochs_get_page(mdev_state, pgoff);
726         mutex_unlock(&mdev_state->ops_lock);
727
728         return page;
729 }
730
731 static void mbochs_put_pages(struct mdev_state *mdev_state)
732 {
733         struct device *dev = mdev_dev(mdev_state->mdev);
734         int i, count = 0;
735
736         WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
737
738         for (i = 0; i < mdev_state->pagecount; i++) {
739                 if (!mdev_state->pages[i])
740                         continue;
741                 put_page(mdev_state->pages[i]);
742                 mdev_state->pages[i] = NULL;
743                 count++;
744         }
745         dev_dbg(dev, "%s: %d pages released\n", __func__, count);
746 }
747
748 static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf)
749 {
750         struct vm_area_struct *vma = vmf->vma;
751         struct mdev_state *mdev_state = vma->vm_private_data;
752         pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
753
754         if (page_offset >= mdev_state->pagecount)
755                 return VM_FAULT_SIGBUS;
756
757         vmf->page = mbochs_get_page(mdev_state, page_offset);
758         if (!vmf->page)
759                 return VM_FAULT_SIGBUS;
760
761         return 0;
762 }
763
764 static const struct vm_operations_struct mbochs_region_vm_ops = {
765         .fault = mbochs_region_vm_fault,
766 };
767
768 static int mbochs_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
769 {
770         struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
771
772         if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
773                 return -EINVAL;
774         if (vma->vm_end < vma->vm_start)
775                 return -EINVAL;
776         if (vma->vm_end - vma->vm_start > mdev_state->memsize)
777                 return -EINVAL;
778         if ((vma->vm_flags & VM_SHARED) == 0)
779                 return -EINVAL;
780
781         vma->vm_ops = &mbochs_region_vm_ops;
782         vma->vm_private_data = mdev_state;
783         return 0;
784 }
785
786 static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf)
787 {
788         struct vm_area_struct *vma = vmf->vma;
789         struct mbochs_dmabuf *dmabuf = vma->vm_private_data;
790
791         if (WARN_ON(vmf->pgoff >= dmabuf->pagecount))
792                 return VM_FAULT_SIGBUS;
793
794         vmf->page = dmabuf->pages[vmf->pgoff];
795         get_page(vmf->page);
796         return 0;
797 }
798
799 static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
800         .fault = mbochs_dmabuf_vm_fault,
801 };
802
803 static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
804 {
805         struct mbochs_dmabuf *dmabuf = buf->priv;
806         struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
807
808         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
809
810         if ((vma->vm_flags & VM_SHARED) == 0)
811                 return -EINVAL;
812
813         vma->vm_ops = &mbochs_dmabuf_vm_ops;
814         vma->vm_private_data = dmabuf;
815         return 0;
816 }
817
818 static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf,
819                                 const char *prefix)
820 {
821         struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
822         u32 fourcc = dmabuf->mode.drm_format;
823
824         dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n",
825                 prefix, dmabuf->id,
826                 fourcc ? ((fourcc >>  0) & 0xff) : '-',
827                 fourcc ? ((fourcc >>  8) & 0xff) : '-',
828                 fourcc ? ((fourcc >> 16) & 0xff) : '-',
829                 fourcc ? ((fourcc >> 24) & 0xff) : '-',
830                 dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride,
831                 dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount);
832 }
833
834 static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at,
835                                           enum dma_data_direction direction)
836 {
837         struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
838         struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
839         struct sg_table *sg;
840
841         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
842
843         sg = kzalloc(sizeof(*sg), GFP_KERNEL);
844         if (!sg)
845                 goto err1;
846         if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount,
847                                       0, dmabuf->mode.size, GFP_KERNEL) < 0)
848                 goto err2;
849         if (!dma_map_sg(at->dev, sg->sgl, sg->nents, direction))
850                 goto err3;
851
852         return sg;
853
854 err3:
855         sg_free_table(sg);
856 err2:
857         kfree(sg);
858 err1:
859         return ERR_PTR(-ENOMEM);
860 }
861
862 static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at,
863                                 struct sg_table *sg,
864                                 enum dma_data_direction direction)
865 {
866         struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
867         struct device *dev = mdev_dev(dmabuf->mdev_state->mdev);
868
869         dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
870
871         sg_free_table(sg);
872         kfree(sg);
873 }
874
875 static 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
894 static 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
902 static void mbochs_kunmap_dmabuf(struct dma_buf *buf, unsigned long page_num,
903                                  void *vaddr)
904 {
905         kunmap(vaddr);
906 }
907
908 static 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,
912         .map              = mbochs_kmap_dmabuf,
913         .unmap            = mbochs_kunmap_dmabuf,
914         .mmap             = mbochs_mmap_dmabuf,
915 };
916
917 static 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
951 err_free_pages:
952         while (pg > 0)
953                 put_page(dmabuf->pages[--pg]);
954         kfree(dmabuf->pages);
955 err_free_dmabuf:
956         kfree(dmabuf);
957         return NULL;
958 }
959
960 static struct mbochs_dmabuf *
961 mbochs_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
975 static struct mbochs_dmabuf *
976 mbochs_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
989 static 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
1020 static int mbochs_get_region_info(struct mdev_device *mdev,
1021                                   struct vfio_region_info_ext *ext)
1022 {
1023         struct vfio_region_info *region_info = &ext->base;
1024         struct mdev_state *mdev_state;
1025
1026         mdev_state = mdev_get_drvdata(mdev);
1027         if (!mdev_state)
1028                 return -EINVAL;
1029
1030         if (region_info->index >= MBOCHS_NUM_REGIONS)
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;
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;
1067         default:
1068                 region_info->size   = 0;
1069                 region_info->offset = 0;
1070                 region_info->flags  = 0;
1071         }
1072
1073         return 0;
1074 }
1075
1076 static 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
1083 static 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;
1087         dev_info->num_regions = MBOCHS_NUM_REGIONS;
1088         dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
1089         return 0;
1090 }
1091
1092 static 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
1147 done:
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
1158 static 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
1183 static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd,
1184                         unsigned long arg)
1185 {
1186         int ret = 0;
1187         unsigned long minsz, outsz;
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
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         {
1216                 struct vfio_region_info_ext info;
1217
1218                 minsz = offsetofend(typeof(info), base.offset);
1219
1220                 if (copy_from_user(&info, (void __user *)arg, minsz))
1221                         return -EFAULT;
1222
1223                 outsz = info.base.argsz;
1224                 if (outsz < minsz)
1225                         return -EINVAL;
1226                 if (outsz > sizeof(info))
1227                         return -EINVAL;
1228
1229                 ret = mbochs_get_region_info(mdev, &info);
1230                 if (ret)
1231                         return ret;
1232
1233                 if (copy_to_user((void __user *)arg, &info, outsz))
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) ||
1249                     (info.index >= VFIO_PCI_NUM_IRQS))
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
1304 static int mbochs_open(struct mdev_device *mdev)
1305 {
1306         if (!try_module_get(THIS_MODULE))
1307                 return -ENODEV;
1308
1309         return 0;
1310 }
1311
1312 static 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
1334 static ssize_t
1335 memory_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 }
1343 static DEVICE_ATTR_RO(memory);
1344
1345 static struct attribute *mdev_dev_attrs[] = {
1346         &dev_attr_memory.attr,
1347         NULL,
1348 };
1349
1350 static const struct attribute_group mdev_dev_group = {
1351         .name  = "vendor",
1352         .attrs = mdev_dev_attrs,
1353 };
1354
1355 const struct attribute_group *mdev_dev_groups[] = {
1356         &mdev_dev_group,
1357         NULL,
1358 };
1359
1360 static ssize_t
1361 name_show(struct kobject *kobj, struct device *dev, char *buf)
1362 {
1363         return sprintf(buf, "%s\n", kobj->name);
1364 }
1365 MDEV_TYPE_ATTR_RO(name);
1366
1367 static ssize_t
1368 description_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 }
1375 MDEV_TYPE_ATTR_RO(description);
1376
1377 static ssize_t
1378 available_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 }
1385 MDEV_TYPE_ATTR_RO(available_instances);
1386
1387 static 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 }
1392 MDEV_TYPE_ATTR_RO(device_api);
1393
1394 static 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
1402 static struct attribute_group mdev_type_group1 = {
1403         .name  = MBOCHS_TYPE_1,
1404         .attrs = mdev_types_attrs,
1405 };
1406
1407 static struct attribute_group mdev_type_group2 = {
1408         .name  = MBOCHS_TYPE_2,
1409         .attrs = mdev_types_attrs,
1410 };
1411
1412 static struct attribute_group mdev_type_group3 = {
1413         .name  = MBOCHS_TYPE_3,
1414         .attrs = mdev_types_attrs,
1415 };
1416
1417 static struct attribute_group *mdev_type_groups[] = {
1418         &mdev_type_group1,
1419         &mdev_type_group2,
1420         &mdev_type_group3,
1421         NULL,
1422 };
1423
1424 static 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
1438 static const struct file_operations vd_fops = {
1439         .owner          = THIS_MODULE,
1440 };
1441
1442 static void mbochs_device_release(struct device *dev)
1443 {
1444         /* nothing */
1445 }
1446
1447 static int __init mbochs_dev_init(void)
1448 {
1449         int ret = 0;
1450
1451         ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK, MBOCHS_NAME);
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);
1457         cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK);
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
1480 failed3:
1481         device_unregister(&mbochs_dev);
1482 failed2:
1483         class_destroy(mbochs_class);
1484 failed1:
1485         cdev_del(&mbochs_cdev);
1486         unregister_chrdev_region(mbochs_devt, MINORMASK);
1487         return ret;
1488 }
1489
1490 static 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);
1497         unregister_chrdev_region(mbochs_devt, MINORMASK);
1498         class_destroy(mbochs_class);
1499         mbochs_class = NULL;
1500 }
1501
1502 module_init(mbochs_dev_init)
1503 module_exit(mbochs_dev_exit)