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/kernel.h>
25	#include <linux/slab.h>
26	#include <linux/vmalloc.h>
27	#include <linux/cdev.h>
28	#include <linux/vfio.h>
29	#include <linux/iommu.h>
30	#include <linux/sysfs.h>
31	#include <linux/mdev.h>
32	#include <linux/pci.h>
33	#include <linux/dma-buf.h>
34	#include <linux/highmem.h>
35	#include <drm/drm_fourcc.h>
36	#include <drm/drm_rect.h>
37	#include <drm/drm_modeset_lock.h>
38	#include <drm/drm_property.h>
39	#include <drm/drm_plane.h>
40
41
42	#define VBE_DISPI_INDEX_ID 0x0
43	#define VBE_DISPI_INDEX_XRES 0x1
44	#define VBE_DISPI_INDEX_YRES 0x2
45	#define VBE_DISPI_INDEX_BPP 0x3
46	#define VBE_DISPI_INDEX_ENABLE 0x4
47	#define VBE_DISPI_INDEX_BANK 0x5
48	#define VBE_DISPI_INDEX_VIRT_WIDTH 0x6
49	#define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7
50	#define VBE_DISPI_INDEX_X_OFFSET 0x8
51	#define VBE_DISPI_INDEX_Y_OFFSET 0x9
52	#define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa
53	#define VBE_DISPI_INDEX_COUNT 0xb
54
55	#define VBE_DISPI_ID0 0xB0C0
56	#define VBE_DISPI_ID1 0xB0C1
57	#define VBE_DISPI_ID2 0xB0C2
58	#define VBE_DISPI_ID3 0xB0C3
59	#define VBE_DISPI_ID4 0xB0C4
60	#define VBE_DISPI_ID5 0xB0C5
61
62	#define VBE_DISPI_DISABLED 0x00
63	#define VBE_DISPI_ENABLED 0x01
64	#define VBE_DISPI_GETCAPS 0x02
65	#define VBE_DISPI_8BIT_DAC 0x20
66	#define VBE_DISPI_LFB_ENABLED 0x40
67	#define VBE_DISPI_NOCLEARMEM 0x80
68
69
70	#define MBOCHS_NAME "mbochs"
71	#define MBOCHS_CLASS_NAME "mbochs"
72
73	#define MBOCHS_EDID_REGION_INDEX VFIO_PCI_NUM_REGIONS
74	#define MBOCHS_NUM_REGIONS (MBOCHS_EDID_REGION_INDEX+1)
75
76	#define MBOCHS_CONFIG_SPACE_SIZE 0xff
77	#define MBOCHS_MMIO_BAR_OFFSET PAGE_SIZE
78	#define MBOCHS_MMIO_BAR_SIZE PAGE_SIZE
79	#define MBOCHS_EDID_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \
80	MBOCHS_MMIO_BAR_SIZE)
81	#define MBOCHS_EDID_SIZE PAGE_SIZE
82	#define MBOCHS_MEMORY_BAR_OFFSET (MBOCHS_EDID_OFFSET + \
83	MBOCHS_EDID_SIZE)
84
85	#define MBOCHS_EDID_BLOB_OFFSET (MBOCHS_EDID_SIZE/2)
86
87	#define STORE_LE16(addr, val) (*(u16 *)addr = val)
88	#define STORE_LE32(addr, val) (*(u32 *)addr = val)
89
90
91	MODULE_LICENSE("GPL v2");
92
93	static int max_mbytes = 256;
94	module_param_named(count, max_mbytes, int, 0444);
95	MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices");
96
97
98	#define MBOCHS_TYPE_1 "small"
99	#define MBOCHS_TYPE_2 "medium"
100	#define MBOCHS_TYPE_3 "large"
101
102	static struct mbochs_type {
103	struct mdev_type type;
104	u32 mbytes;
105	u32 max_x;
106	u32 max_y;
107	} mbochs_types[] = {
108	{
109	.type.sysfs_name = MBOCHS_TYPE_1,
110	.type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1,
111	.mbytes = 4,
112	.max_x = 800,
113	.max_y = 600,
114	}, {
115	.type.sysfs_name = MBOCHS_TYPE_2,
116	.type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2,
117	.mbytes = 16,
118	.max_x = 1920,
119	.max_y = 1440,
120	}, {
121	.type.sysfs_name = MBOCHS_TYPE_3,
122	.type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3,
123	.mbytes = 64,
124	.max_x = 0,
125	.max_y = 0,
126	},
127	};
128
129	static struct mdev_type *mbochs_mdev_types[] = {
130	&mbochs_types[0].type,
131	&mbochs_types[1].type,
132	&mbochs_types[2].type,
133	};
134
135	static dev_t mbochs_devt;
136	static struct class *mbochs_class;
137	static struct cdev mbochs_cdev;
138	static struct device mbochs_dev;
139	static struct mdev_parent mbochs_parent;
140	static atomic_t mbochs_avail_mbytes;
141	static const struct vfio_device_ops mbochs_dev_ops;
142
143	struct vfio_region_info_ext {
144	struct vfio_region_info base;
145	struct vfio_region_info_cap_type type;
146	};
147
148	struct mbochs_mode {
149	u32 drm_format;
150	u32 bytepp;
151	u32 width;
152	u32 height;
153	u32 stride;
154	u32 __pad;
155	u64 offset;
156	u64 size;
157	};
158
159	struct mbochs_dmabuf {
160	struct mbochs_mode mode;
161	u32 id;
162	struct page **pages;
163	pgoff_t pagecount;
164	struct dma_buf *buf;
165	struct mdev_state *mdev_state;
166	struct list_head next;
167	bool unlinked;
168	};
169
170	/* State of each mdev device */
171	struct mdev_state {
172	struct vfio_device vdev;
173	u8 *vconfig;
174	u64 bar_mask[3];
175	u32 memory_bar_mask;
176	struct mutex ops_lock;
177	struct mdev_device *mdev;
178
179	const struct mbochs_type *type;
180	u16 vbe[VBE_DISPI_INDEX_COUNT];
181	u64 memsize;
182	struct page **pages;
183	pgoff_t pagecount;
184	struct vfio_region_gfx_edid edid_regs;
185	u8 edid_blob[0x400];
186
187	struct list_head dmabufs;
188	u32 active_id;
189	u32 next_id;
190	};
191
192	static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = {
193	[VBE_DISPI_INDEX_ID] = "id",
194	[VBE_DISPI_INDEX_XRES] = "xres",
195	[VBE_DISPI_INDEX_YRES] = "yres",
196	[VBE_DISPI_INDEX_BPP] = "bpp",
197	[VBE_DISPI_INDEX_ENABLE] = "enable",
198	[VBE_DISPI_INDEX_BANK] = "bank",
199	[VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width",
200	[VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height",
201	[VBE_DISPI_INDEX_X_OFFSET] = "x-offset",
202	[VBE_DISPI_INDEX_Y_OFFSET] = "y-offset",
203	[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem",
204	};
205
206	static const char *vbe_name(u32 index)
207	{
208	if (index < ARRAY_SIZE(vbe_name_list))
209	return vbe_name_list[index];
210	return "(invalid)";
211	}
212
213	static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
214	pgoff_t pgoff);
215	static struct page *mbochs_get_page(struct mdev_state *mdev_state,
216	pgoff_t pgoff);
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: 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(p: mode1, q: mode2, size: 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: 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: 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: 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_state *mdev_state, char *buf,
439	size_t count, loff_t pos, bool is_write)
440	{
441	struct page *pg;
442	loff_t poff;
443	char *map;
444	int ret = 0;
445
446	mutex_lock(&mdev_state->ops_lock);
447
448	if (pos < MBOCHS_CONFIG_SPACE_SIZE) {
449	if (is_write)
450	handle_pci_cfg_write(mdev_state, offset: pos, buf, count);
451	else
452	memcpy(buf, (mdev_state->vconfig + pos), count);
453
454	} else if (pos >= MBOCHS_MMIO_BAR_OFFSET &&
455	pos + count <= (MBOCHS_MMIO_BAR_OFFSET +
456	MBOCHS_MMIO_BAR_SIZE)) {
457	pos -= MBOCHS_MMIO_BAR_OFFSET;
458	if (is_write)
459	handle_mmio_write(mdev_state, offset: pos, buf, count);
460	else
461	handle_mmio_read(mdev_state, offset: pos, buf, count);
462
463	} else if (pos >= MBOCHS_EDID_OFFSET &&
464	pos + count <= (MBOCHS_EDID_OFFSET +
465	MBOCHS_EDID_SIZE)) {
466	pos -= MBOCHS_EDID_OFFSET;
467	if (pos < MBOCHS_EDID_BLOB_OFFSET) {
468	handle_edid_regs(mdev_state, offset: pos, buf, count, is_write);
469	} else {
470	pos -= MBOCHS_EDID_BLOB_OFFSET;
471	handle_edid_blob(mdev_state, offset: pos, buf, count, is_write);
472	}
473
474	} else if (pos >= MBOCHS_MEMORY_BAR_OFFSET &&
475	pos + count <=
476	MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) {
477	pos -= MBOCHS_MMIO_BAR_OFFSET;
478	poff = pos & ~PAGE_MASK;
479	pg = __mbochs_get_page(mdev_state, pgoff: pos >> PAGE_SHIFT);
480	map = kmap(page: pg);
481	if (is_write)
482	memcpy(map + poff, buf, count);
483	else
484	memcpy(buf, map + poff, count);
485	kunmap(page: pg);
486	put_page(page: pg);
487
488	} else {
489	dev_dbg(mdev_state->vdev.dev, "%s: %s @0x%llx (unhandled)\n",
490	__func__, is_write ? "WR" : "RD", pos);
491	ret = -1;
492	goto accessfailed;
493	}
494
495	ret = count;
496
497
498	accessfailed:
499	mutex_unlock(lock: &mdev_state->ops_lock);
500
501	return ret;
502	}
503
504	static int mbochs_reset(struct mdev_state *mdev_state)
505	{
506	u32 size64k = mdev_state->memsize / (64 * 1024);
507	int i;
508
509	for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++)
510	mdev_state->vbe[i] = 0;
511	mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5;
512	mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k;
513	return 0;
514	}
515
516	static int mbochs_init_dev(struct vfio_device *vdev)
517	{
518	struct mdev_state *mdev_state =
519	container_of(vdev, struct mdev_state, vdev);
520	struct mdev_device *mdev = to_mdev_device(dev: vdev->dev);
521	struct mbochs_type *type =
522	container_of(mdev->type, struct mbochs_type, type);
523	int avail_mbytes = atomic_read(v: &mbochs_avail_mbytes);
524	int ret = -ENOMEM;
525
526	do {
527	if (avail_mbytes < type->mbytes)
528	return -ENOSPC;
529	} while (!atomic_try_cmpxchg(v: &mbochs_avail_mbytes, old: &avail_mbytes,
530	new: avail_mbytes - type->mbytes));
531
532	mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
533	if (!mdev_state->vconfig)
534	goto err_avail;
535
536	mdev_state->memsize = type->mbytes * 1024 * 1024;
537	mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT;
538	mdev_state->pages = kcalloc(n: mdev_state->pagecount,
539	size: sizeof(struct page *),
540	GFP_KERNEL);
541	if (!mdev_state->pages)
542	goto err_vconfig;
543
544	mutex_init(&mdev_state->ops_lock);
545	mdev_state->mdev = mdev;
546	INIT_LIST_HEAD(list: &mdev_state->dmabufs);
547	mdev_state->next_id = 1;
548
549	mdev_state->type = type;
550	mdev_state->edid_regs.max_xres = type->max_x;
551	mdev_state->edid_regs.max_yres = type->max_y;
552	mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET;
553	mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob);
554	mbochs_create_config_space(mdev_state);
555	mbochs_reset(mdev_state);
556
557	dev_info(vdev->dev, "%s: %s, %d MB, %ld pages\n", __func__,
558	type->type.pretty_name, type->mbytes, mdev_state->pagecount);
559	return 0;
560
561	err_vconfig:
562	kfree(objp: mdev_state->vconfig);
563	err_avail:
564	atomic_add(i: type->mbytes, v: &mbochs_avail_mbytes);
565	return ret;
566	}
567
568	static int mbochs_probe(struct mdev_device *mdev)
569	{
570	struct mdev_state *mdev_state;
571	int ret = -ENOMEM;
572
573	mdev_state = vfio_alloc_device(mdev_state, vdev, &mdev->dev,
574	&mbochs_dev_ops);
575	if (IS_ERR(ptr: mdev_state))
576	return PTR_ERR(ptr: mdev_state);
577
578	ret = vfio_register_emulated_iommu_dev(device: &mdev_state->vdev);
579	if (ret)
580	goto err_put_vdev;
581	dev_set_drvdata(dev: &mdev->dev, data: mdev_state);
582	return 0;
583
584	err_put_vdev:
585	vfio_put_device(device: &mdev_state->vdev);
586	return ret;
587	}
588
589	static void mbochs_release_dev(struct vfio_device *vdev)
590	{
591	struct mdev_state *mdev_state =
592	container_of(vdev, struct mdev_state, vdev);
593
594	atomic_add(i: mdev_state->type->mbytes, v: &mbochs_avail_mbytes);
595	kfree(objp: mdev_state->pages);
596	kfree(objp: mdev_state->vconfig);
597	}
598
599	static void mbochs_remove(struct mdev_device *mdev)
600	{
601	struct mdev_state *mdev_state = dev_get_drvdata(dev: &mdev->dev);
602
603	vfio_unregister_group_dev(device: &mdev_state->vdev);
604	vfio_put_device(device: &mdev_state->vdev);
605	}
606
607	static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf,
608	size_t count, loff_t *ppos)
609	{
610	struct mdev_state *mdev_state =
611	container_of(vdev, struct mdev_state, vdev);
612	unsigned int done = 0;
613	int ret;
614
615	while (count) {
616	size_t filled;
617
618	if (count >= 4 && !(*ppos % 4)) {
619	u32 val;
620
621	ret = mdev_access(mdev_state, buf: (char *)&val, count: sizeof(val),
622	pos: *ppos, is_write: false);
623	if (ret <= 0)
624	goto read_err;
625
626	if (copy_to_user(to: buf, from: &val, n: sizeof(val)))
627	goto read_err;
628
629	filled = 4;
630	} else if (count >= 2 && !(*ppos % 2)) {
631	u16 val;
632
633	ret = mdev_access(mdev_state, buf: (char *)&val, count: sizeof(val),
634	pos: *ppos, is_write: false);
635	if (ret <= 0)
636	goto read_err;
637
638	if (copy_to_user(to: buf, from: &val, n: sizeof(val)))
639	goto read_err;
640
641	filled = 2;
642	} else {
643	u8 val;
644
645	ret = mdev_access(mdev_state, buf: (char *)&val, count: sizeof(val),
646	pos: *ppos, is_write: false);
647	if (ret <= 0)
648	goto read_err;
649
650	if (copy_to_user(to: buf, from: &val, n: sizeof(val)))
651	goto read_err;
652
653	filled = 1;
654	}
655
656	count -= filled;
657	done += filled;
658	*ppos += filled;
659	buf += filled;
660	}
661
662	return done;
663
664	read_err:
665	return -EFAULT;
666	}
667
668	static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf,
669	size_t count, loff_t *ppos)
670	{
671	struct mdev_state *mdev_state =
672	container_of(vdev, struct mdev_state, vdev);
673	unsigned int done = 0;
674	int ret;
675
676	while (count) {
677	size_t filled;
678
679	if (count >= 4 && !(*ppos % 4)) {
680	u32 val;
681
682	if (copy_from_user(to: &val, from: buf, n: sizeof(val)))
683	goto write_err;
684
685	ret = mdev_access(mdev_state, buf: (char *)&val, count: sizeof(val),
686	pos: *ppos, is_write: true);
687	if (ret <= 0)
688	goto write_err;
689
690	filled = 4;
691	} else if (count >= 2 && !(*ppos % 2)) {
692	u16 val;
693
694	if (copy_from_user(to: &val, from: buf, n: sizeof(val)))
695	goto write_err;
696
697	ret = mdev_access(mdev_state, buf: (char *)&val, count: sizeof(val),
698	pos: *ppos, is_write: true);
699	if (ret <= 0)
700	goto write_err;
701
702	filled = 2;
703	} else {
704	u8 val;
705
706	if (copy_from_user(to: &val, from: buf, n: sizeof(val)))
707	goto write_err;
708
709	ret = mdev_access(mdev_state, buf: (char *)&val, count: sizeof(val),
710	pos: *ppos, is_write: true);
711	if (ret <= 0)
712	goto write_err;
713
714	filled = 1;
715	}
716	count -= filled;
717	done += filled;
718	*ppos += filled;
719	buf += filled;
720	}
721
722	return done;
723	write_err:
724	return -EFAULT;
725	}
726
727	static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
728	pgoff_t pgoff)
729	{
730	WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
731
732	if (!mdev_state->pages[pgoff]) {
733	mdev_state->pages[pgoff] =
734	alloc_pages(GFP_HIGHUSER | __GFP_ZERO, order: 0);
735	if (!mdev_state->pages[pgoff])
736	return NULL;
737	}
738
739	get_page(page: mdev_state->pages[pgoff]);
740	return mdev_state->pages[pgoff];
741	}
742
743	static struct page *mbochs_get_page(struct mdev_state *mdev_state,
744	pgoff_t pgoff)
745	{
746	struct page *page;
747
748	if (WARN_ON(pgoff >= mdev_state->pagecount))
749	return NULL;
750
751	mutex_lock(&mdev_state->ops_lock);
752	page = __mbochs_get_page(mdev_state, pgoff);
753	mutex_unlock(lock: &mdev_state->ops_lock);
754
755	return page;
756	}
757
758	static void mbochs_put_pages(struct mdev_state *mdev_state)
759	{
760	struct device *dev = mdev_dev(mdev: mdev_state->mdev);
761	int i, count = 0;
762
763	WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
764
765	for (i = 0; i < mdev_state->pagecount; i++) {
766	if (!mdev_state->pages[i])
767	continue;
768	put_page(page: mdev_state->pages[i]);
769	mdev_state->pages[i] = NULL;
770	count++;
771	}
772	dev_dbg(dev, "%s: %d pages released\n", __func__, count);
773	}
774
775	static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf)
776	{
777	struct vm_area_struct *vma = vmf->vma;
778	struct mdev_state *mdev_state = vma->vm_private_data;
779	pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
780
781	if (page_offset >= mdev_state->pagecount)
782	return VM_FAULT_SIGBUS;
783
784	vmf->page = mbochs_get_page(mdev_state, pgoff: page_offset);
785	if (!vmf->page)
786	return VM_FAULT_SIGBUS;
787
788	return 0;
789	}
790
791	static const struct vm_operations_struct mbochs_region_vm_ops = {
792	.fault = mbochs_region_vm_fault,
793	};
794
795	static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma)
796	{
797	struct mdev_state *mdev_state =
798	container_of(vdev, struct mdev_state, vdev);
799
800	if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT)
801	return -EINVAL;
802	if (vma->vm_end < vma->vm_start)
803	return -EINVAL;
804	if (vma->vm_end - vma->vm_start > mdev_state->memsize)
805	return -EINVAL;
806	if ((vma->vm_flags & VM_SHARED) == 0)
807	return -EINVAL;
808
809	vma->vm_ops = &mbochs_region_vm_ops;
810	vma->vm_private_data = mdev_state;
811	return 0;
812	}
813
814	static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf)
815	{
816	struct vm_area_struct *vma = vmf->vma;
817	struct mbochs_dmabuf *dmabuf = vma->vm_private_data;
818
819	if (WARN_ON(vmf->pgoff >= dmabuf->pagecount))
820	return VM_FAULT_SIGBUS;
821
822	vmf->page = dmabuf->pages[vmf->pgoff];
823	get_page(page: vmf->page);
824	return 0;
825	}
826
827	static const struct vm_operations_struct mbochs_dmabuf_vm_ops = {
828	.fault = mbochs_dmabuf_vm_fault,
829	};
830
831	static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
832	{
833	struct mbochs_dmabuf *dmabuf = buf->priv;
834	struct device *dev = mdev_dev(mdev: dmabuf->mdev_state->mdev);
835
836	dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
837
838	if ((vma->vm_flags & VM_SHARED) == 0)
839	return -EINVAL;
840
841	vma->vm_ops = &mbochs_dmabuf_vm_ops;
842	vma->vm_private_data = dmabuf;
843	return 0;
844	}
845
846	static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf,
847	const char *prefix)
848	{
849	struct device *dev = mdev_dev(mdev: dmabuf->mdev_state->mdev);
850	u32 fourcc = dmabuf->mode.drm_format;
851
852	dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n",
853	prefix, dmabuf->id,
854	fourcc ? ((fourcc >> 0) & 0xff) : '-',
855	fourcc ? ((fourcc >> 8) & 0xff) : '-',
856	fourcc ? ((fourcc >> 16) & 0xff) : '-',
857	fourcc ? ((fourcc >> 24) & 0xff) : '-',
858	dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride,
859	dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount);
860	}
861
862	static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at,
863	enum dma_data_direction direction)
864	{
865	struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
866	struct device *dev = mdev_dev(mdev: dmabuf->mdev_state->mdev);
867	struct sg_table *sg;
868
869	dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
870
871	sg = kzalloc(size: sizeof(*sg), GFP_KERNEL);
872	if (!sg)
873	goto err1;
874	if (sg_alloc_table_from_pages(sgt: sg, pages: dmabuf->pages, n_pages: dmabuf->pagecount,
875	offset: 0, size: dmabuf->mode.size, GFP_KERNEL) < 0)
876	goto err2;
877	if (dma_map_sgtable(dev: at->dev, sgt: sg, dir: direction, attrs: 0))
878	goto err3;
879
880	return sg;
881
882	err3:
883	sg_free_table(sg);
884	err2:
885	kfree(objp: sg);
886	err1:
887	return ERR_PTR(error: -ENOMEM);
888	}
889
890	static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at,
891	struct sg_table *sg,
892	enum dma_data_direction direction)
893	{
894	struct mbochs_dmabuf *dmabuf = at->dmabuf->priv;
895	struct device *dev = mdev_dev(mdev: dmabuf->mdev_state->mdev);
896
897	dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
898
899	dma_unmap_sgtable(dev: at->dev, sgt: sg, dir: direction, attrs: 0);
900	sg_free_table(sg);
901	kfree(objp: sg);
902	}
903
904	static void mbochs_release_dmabuf(struct dma_buf *buf)
905	{
906	struct mbochs_dmabuf *dmabuf = buf->priv;
907	struct mdev_state *mdev_state = dmabuf->mdev_state;
908	struct device *dev = mdev_dev(mdev: mdev_state->mdev);
909	pgoff_t pg;
910
911	dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
912
913	for (pg = 0; pg < dmabuf->pagecount; pg++)
914	put_page(page: dmabuf->pages[pg]);
915
916	mutex_lock(&mdev_state->ops_lock);
917	dmabuf->buf = NULL;
918	if (dmabuf->unlinked)
919	kfree(objp: dmabuf);
920	mutex_unlock(lock: &mdev_state->ops_lock);
921	}
922
923	static struct dma_buf_ops mbochs_dmabuf_ops = {
924	.map_dma_buf = mbochs_map_dmabuf,
925	.unmap_dma_buf = mbochs_unmap_dmabuf,
926	.release = mbochs_release_dmabuf,
927	.mmap = mbochs_mmap_dmabuf,
928	};
929
930	static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state,
931	struct mbochs_mode *mode)
932	{
933	struct mbochs_dmabuf *dmabuf;
934	pgoff_t page_offset, pg;
935
936	WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
937
938	dmabuf = kzalloc(size: sizeof(struct mbochs_dmabuf), GFP_KERNEL);
939	if (!dmabuf)
940	return NULL;
941
942	dmabuf->mode = *mode;
943	dmabuf->id = mdev_state->next_id++;
944	dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE);
945	dmabuf->pages = kcalloc(n: dmabuf->pagecount, size: sizeof(struct page *),
946	GFP_KERNEL);
947	if (!dmabuf->pages)
948	goto err_free_dmabuf;
949
950	page_offset = dmabuf->mode.offset >> PAGE_SHIFT;
951	for (pg = 0; pg < dmabuf->pagecount; pg++) {
952	dmabuf->pages[pg] = __mbochs_get_page(mdev_state,
953	pgoff: page_offset + pg);
954	if (!dmabuf->pages[pg])
955	goto err_free_pages;
956	}
957
958	dmabuf->mdev_state = mdev_state;
959	list_add(new: &dmabuf->next, head: &mdev_state->dmabufs);
960
961	mbochs_print_dmabuf(dmabuf, prefix: __func__);
962	return dmabuf;
963
964	err_free_pages:
965	while (pg > 0)
966	put_page(page: dmabuf->pages[--pg]);
967	kfree(objp: dmabuf->pages);
968	err_free_dmabuf:
969	kfree(objp: dmabuf);
970	return NULL;
971	}
972
973	static struct mbochs_dmabuf *
974	mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state,
975	struct mbochs_mode *mode)
976	{
977	struct mbochs_dmabuf *dmabuf;
978
979	WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
980
981	list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
982	if (mbochs_modes_equal(mode1: &dmabuf->mode, mode2: mode))
983	return dmabuf;
984
985	return NULL;
986	}
987
988	static struct mbochs_dmabuf *
989	mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id)
990	{
991	struct mbochs_dmabuf *dmabuf;
992
993	WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
994
995	list_for_each_entry(dmabuf, &mdev_state->dmabufs, next)
996	if (dmabuf->id == id)
997	return dmabuf;
998
999	return NULL;
1000	}
1001
1002	static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf)
1003	{
1004	struct mdev_state *mdev_state = dmabuf->mdev_state;
1005	struct device *dev = mdev_state->vdev.dev;
1006	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1007	struct dma_buf *buf;
1008
1009	WARN_ON(!mutex_is_locked(&mdev_state->ops_lock));
1010
1011	if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) {
1012	dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n",
1013	__func__);
1014	return -EINVAL;
1015	}
1016
1017	exp_info.ops = &mbochs_dmabuf_ops;
1018	exp_info.size = dmabuf->mode.size;
1019	exp_info.priv = dmabuf;
1020
1021	buf = dma_buf_export(exp_info: &exp_info);
1022	if (IS_ERR(ptr: buf)) {
1023	dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n",
1024	__func__, PTR_ERR(buf));
1025	return PTR_ERR(ptr: buf);
1026	}
1027
1028	dmabuf->buf = buf;
1029	dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id);
1030	return 0;
1031	}
1032
1033	static int mbochs_get_region_info(struct mdev_state *mdev_state,
1034	struct vfio_region_info_ext *ext)
1035	{
1036	struct vfio_region_info *region_info = &ext->base;
1037
1038	if (region_info->index >= MBOCHS_NUM_REGIONS)
1039	return -EINVAL;
1040
1041	switch (region_info->index) {
1042	case VFIO_PCI_CONFIG_REGION_INDEX:
1043	region_info->offset = 0;
1044	region_info->size = MBOCHS_CONFIG_SPACE_SIZE;
1045	region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1046	VFIO_REGION_INFO_FLAG_WRITE);
1047	break;
1048	case VFIO_PCI_BAR0_REGION_INDEX:
1049	region_info->offset = MBOCHS_MEMORY_BAR_OFFSET;
1050	region_info->size = mdev_state->memsize;
1051	region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1052	VFIO_REGION_INFO_FLAG_WRITE |
1053	VFIO_REGION_INFO_FLAG_MMAP);
1054	break;
1055	case VFIO_PCI_BAR2_REGION_INDEX:
1056	region_info->offset = MBOCHS_MMIO_BAR_OFFSET;
1057	region_info->size = MBOCHS_MMIO_BAR_SIZE;
1058	region_info->flags = (VFIO_REGION_INFO_FLAG_READ |
1059	VFIO_REGION_INFO_FLAG_WRITE);
1060	break;
1061	case MBOCHS_EDID_REGION_INDEX:
1062	ext->base.argsz = sizeof(*ext);
1063	ext->base.offset = MBOCHS_EDID_OFFSET;
1064	ext->base.size = MBOCHS_EDID_SIZE;
1065	ext->base.flags = (VFIO_REGION_INFO_FLAG_READ |
1066	VFIO_REGION_INFO_FLAG_WRITE |
1067	VFIO_REGION_INFO_FLAG_CAPS);
1068	ext->base.cap_offset = offsetof(typeof(*ext), type);
1069	ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE;
1070	ext->type.header.version = 1;
1071	ext->type.header.next = 0;
1072	ext->type.type = VFIO_REGION_TYPE_GFX;
1073	ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID;
1074	break;
1075	default:
1076	region_info->size = 0;
1077	region_info->offset = 0;
1078	region_info->flags = 0;
1079	}
1080
1081	return 0;
1082	}
1083
1084	static int mbochs_get_irq_info(struct vfio_irq_info *irq_info)
1085	{
1086	irq_info->count = 0;
1087	return 0;
1088	}
1089
1090	static int mbochs_get_device_info(struct vfio_device_info *dev_info)
1091	{
1092	dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
1093	dev_info->num_regions = MBOCHS_NUM_REGIONS;
1094	dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
1095	return 0;
1096	}
1097
1098	static int mbochs_query_gfx_plane(struct mdev_state *mdev_state,
1099	struct vfio_device_gfx_plane_info *plane)
1100	{
1101	struct mbochs_dmabuf *dmabuf;
1102	struct mbochs_mode mode;
1103	int ret;
1104
1105	if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) {
1106	if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE |
1107	VFIO_GFX_PLANE_TYPE_DMABUF))
1108	return 0;
1109	return -EINVAL;
1110	}
1111
1112	if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF)
1113	return -EINVAL;
1114
1115	plane->drm_format_mod = 0;
1116	plane->x_pos = 0;
1117	plane->y_pos = 0;
1118	plane->x_hot = 0;
1119	plane->y_hot = 0;
1120
1121	mutex_lock(&mdev_state->ops_lock);
1122
1123	ret = -EINVAL;
1124	if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY)
1125	ret = mbochs_check_framebuffer(mdev_state, mode: &mode);
1126	if (ret < 0) {
1127	plane->drm_format = 0;
1128	plane->width = 0;
1129	plane->height = 0;
1130	plane->stride = 0;
1131	plane->size = 0;
1132	plane->dmabuf_id = 0;
1133	goto done;
1134	}
1135
1136	dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, mode: &mode);
1137	if (!dmabuf)
1138	mbochs_dmabuf_alloc(mdev_state, mode: &mode);
1139	if (!dmabuf) {
1140	mutex_unlock(lock: &mdev_state->ops_lock);
1141	return -ENOMEM;
1142	}
1143
1144	plane->drm_format = dmabuf->mode.drm_format;
1145	plane->width = dmabuf->mode.width;
1146	plane->height = dmabuf->mode.height;
1147	plane->stride = dmabuf->mode.stride;
1148	plane->size = dmabuf->mode.size;
1149	plane->dmabuf_id = dmabuf->id;
1150
1151	done:
1152	if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY &&
1153	mdev_state->active_id != plane->dmabuf_id) {
1154	dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n",
1155	__func__, mdev_state->active_id, plane->dmabuf_id);
1156	mdev_state->active_id = plane->dmabuf_id;
1157	}
1158	mutex_unlock(lock: &mdev_state->ops_lock);
1159	return 0;
1160	}
1161
1162	static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id)
1163	{
1164	struct mbochs_dmabuf *dmabuf;
1165
1166	mutex_lock(&mdev_state->ops_lock);
1167
1168	dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id);
1169	if (!dmabuf) {
1170	mutex_unlock(lock: &mdev_state->ops_lock);
1171	return -ENOENT;
1172	}
1173
1174	if (!dmabuf->buf)
1175	mbochs_dmabuf_export(dmabuf);
1176
1177	mutex_unlock(lock: &mdev_state->ops_lock);
1178
1179	if (!dmabuf->buf)
1180	return -EINVAL;
1181
1182	return dma_buf_fd(dmabuf: dmabuf->buf, flags: 0);
1183	}
1184
1185	static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd,
1186	unsigned long arg)
1187	{
1188	struct mdev_state *mdev_state =
1189	container_of(vdev, struct mdev_state, vdev);
1190	int ret = 0;
1191	unsigned long minsz, outsz;
1192
1193	switch (cmd) {
1194	case VFIO_DEVICE_GET_INFO:
1195	{
1196	struct vfio_device_info info;
1197
1198	minsz = offsetofend(struct vfio_device_info, num_irqs);
1199
1200	if (copy_from_user(to: &info, from: (void __user *)arg, n: minsz))
1201	return -EFAULT;
1202
1203	if (info.argsz < minsz)
1204	return -EINVAL;
1205
1206	ret = mbochs_get_device_info(dev_info: &info);
1207	if (ret)
1208	return ret;
1209
1210	if (copy_to_user(to: (void __user *)arg, from: &info, n: minsz))
1211	return -EFAULT;
1212
1213	return 0;
1214	}
1215	case VFIO_DEVICE_GET_REGION_INFO:
1216	{
1217	struct vfio_region_info_ext info;
1218
1219	minsz = offsetofend(typeof(info), base.offset);
1220
1221	if (copy_from_user(to: &info, from: (void __user *)arg, n: minsz))
1222	return -EFAULT;
1223
1224	outsz = info.base.argsz;
1225	if (outsz < minsz)
1226	return -EINVAL;
1227	if (outsz > sizeof(info))
1228	return -EINVAL;
1229
1230	ret = mbochs_get_region_info(mdev_state, ext: &info);
1231	if (ret)
1232	return ret;
1233
1234	if (copy_to_user(to: (void __user *)arg, from: &info, n: outsz))
1235	return -EFAULT;
1236
1237	return 0;
1238	}
1239
1240	case VFIO_DEVICE_GET_IRQ_INFO:
1241	{
1242	struct vfio_irq_info info;
1243
1244	minsz = offsetofend(struct vfio_irq_info, count);
1245
1246	if (copy_from_user(to: &info, from: (void __user *)arg, n: minsz))
1247	return -EFAULT;
1248
1249	if ((info.argsz < minsz) ||
1250	(info.index >= VFIO_PCI_NUM_IRQS))
1251	return -EINVAL;
1252
1253	ret = mbochs_get_irq_info(irq_info: &info);
1254	if (ret)
1255	return ret;
1256
1257	if (copy_to_user(to: (void __user *)arg, from: &info, n: minsz))
1258	return -EFAULT;
1259
1260	return 0;
1261	}
1262
1263	case VFIO_DEVICE_QUERY_GFX_PLANE:
1264	{
1265	struct vfio_device_gfx_plane_info plane = {};
1266
1267	minsz = offsetofend(struct vfio_device_gfx_plane_info,
1268	region_index);
1269
1270	if (copy_from_user(to: &plane, from: (void __user *)arg, n: minsz))
1271	return -EFAULT;
1272
1273	if (plane.argsz < minsz)
1274	return -EINVAL;
1275
1276	ret = mbochs_query_gfx_plane(mdev_state, plane: &plane);
1277	if (ret)
1278	return ret;
1279
1280	if (copy_to_user(to: (void __user *)arg, from: &plane, n: minsz))
1281	return -EFAULT;
1282
1283	return 0;
1284	}
1285
1286	case VFIO_DEVICE_GET_GFX_DMABUF:
1287	{
1288	u32 dmabuf_id;
1289
1290	if (get_user(dmabuf_id, (__u32 __user *)arg))
1291	return -EFAULT;
1292
1293	return mbochs_get_gfx_dmabuf(mdev_state, id: dmabuf_id);
1294	}
1295
1296	case VFIO_DEVICE_SET_IRQS:
1297	return -EINVAL;
1298
1299	case VFIO_DEVICE_RESET:
1300	return mbochs_reset(mdev_state);
1301	}
1302	return -ENOTTY;
1303	}
1304
1305	static void mbochs_close_device(struct vfio_device *vdev)
1306	{
1307	struct mdev_state *mdev_state =
1308	container_of(vdev, struct mdev_state, vdev);
1309	struct mbochs_dmabuf *dmabuf, *tmp;
1310
1311	mutex_lock(&mdev_state->ops_lock);
1312
1313	list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) {
1314	list_del(entry: &dmabuf->next);
1315	if (dmabuf->buf) {
1316	/* free in mbochs_release_dmabuf() */
1317	dmabuf->unlinked = true;
1318	} else {
1319	kfree(objp: dmabuf);
1320	}
1321	}
1322	mbochs_put_pages(mdev_state);
1323
1324	mutex_unlock(lock: &mdev_state->ops_lock);
1325	}
1326
1327	static ssize_t
1328	memory_show(struct device *dev, struct device_attribute *attr,
1329	char *buf)
1330	{
1331	struct mdev_state *mdev_state = dev_get_drvdata(dev);
1332
1333	return sprintf(buf, fmt: "%d MB\n", mdev_state->type->mbytes);
1334	}
1335	static DEVICE_ATTR_RO(memory);
1336
1337	static struct attribute *mdev_dev_attrs[] = {
1338	&dev_attr_memory.attr,
1339	NULL,
1340	};
1341
1342	static const struct attribute_group mdev_dev_group = {
1343	.name = "vendor",
1344	.attrs = mdev_dev_attrs,
1345	};
1346
1347	static const struct attribute_group *mdev_dev_groups[] = {
1348	&mdev_dev_group,
1349	NULL,
1350	};
1351
1352	static ssize_t mbochs_show_description(struct mdev_type *mtype, char *buf)
1353	{
1354	struct mbochs_type *type =
1355	container_of(mtype, struct mbochs_type, type);
1356
1357	return sprintf(buf, fmt: "virtual display, %d MB video memory\n",
1358	type ? type->mbytes : 0);
1359	}
1360
1361	static unsigned int mbochs_get_available(struct mdev_type *mtype)
1362	{
1363	struct mbochs_type *type =
1364	container_of(mtype, struct mbochs_type, type);
1365
1366	return atomic_read(v: &mbochs_avail_mbytes) / type->mbytes;
1367	}
1368
1369	static const struct vfio_device_ops mbochs_dev_ops = {
1370	.close_device = mbochs_close_device,
1371	.init = mbochs_init_dev,
1372	.release = mbochs_release_dev,
1373	.read = mbochs_read,
1374	.write = mbochs_write,
1375	.ioctl = mbochs_ioctl,
1376	.mmap = mbochs_mmap,
1377	.bind_iommufd = vfio_iommufd_emulated_bind,
1378	.unbind_iommufd = vfio_iommufd_emulated_unbind,
1379	.attach_ioas = vfio_iommufd_emulated_attach_ioas,
1380	.detach_ioas = vfio_iommufd_emulated_detach_ioas,
1381	};
1382
1383	static struct mdev_driver mbochs_driver = {
1384	.device_api = VFIO_DEVICE_API_PCI_STRING,
1385	.driver = {
1386	.name = "mbochs",
1387	.owner = THIS_MODULE,
1388	.mod_name = KBUILD_MODNAME,
1389	.dev_groups = mdev_dev_groups,
1390	},
1391	.probe = mbochs_probe,
1392	.remove = mbochs_remove,
1393	.get_available = mbochs_get_available,
1394	.show_description = mbochs_show_description,
1395	};
1396
1397	static const struct file_operations vd_fops = {
1398	.owner = THIS_MODULE,
1399	};
1400
1401	static void mbochs_device_release(struct device *dev)
1402	{
1403	/* nothing */
1404	}
1405
1406	static int __init mbochs_dev_init(void)
1407	{
1408	int ret = 0;
1409
1410	atomic_set(v: &mbochs_avail_mbytes, i: max_mbytes);
1411
1412	ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
1413	if (ret < 0) {
1414	pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
1415	return ret;
1416	}
1417	cdev_init(&mbochs_cdev, &vd_fops);
1418	cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
1419	pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
1420
1421	ret = mdev_register_driver(drv: &mbochs_driver);
1422	if (ret)
1423	goto err_cdev;
1424
1425	mbochs_class = class_create(MBOCHS_CLASS_NAME);
1426	if (IS_ERR(ptr: mbochs_class)) {
1427	pr_err("Error: failed to register mbochs_dev class\n");
1428	ret = PTR_ERR(ptr: mbochs_class);
1429	goto err_driver;
1430	}
1431	mbochs_dev.class = mbochs_class;
1432	mbochs_dev.release = mbochs_device_release;
1433	dev_set_name(dev: &mbochs_dev, name: "%s", MBOCHS_NAME);
1434
1435	ret = device_register(dev: &mbochs_dev);
1436	if (ret)
1437	goto err_put;
1438
1439	ret = mdev_register_parent(parent: &mbochs_parent, dev: &mbochs_dev, mdev_driver: &mbochs_driver,
1440	types: mbochs_mdev_types,
1441	ARRAY_SIZE(mbochs_mdev_types));
1442	if (ret)
1443	goto err_device;
1444
1445	return 0;
1446
1447	err_device:
1448	device_del(dev: &mbochs_dev);
1449	err_put:
1450	put_device(dev: &mbochs_dev);
1451	class_destroy(cls: mbochs_class);
1452	err_driver:
1453	mdev_unregister_driver(drv: &mbochs_driver);
1454	err_cdev:
1455	cdev_del(&mbochs_cdev);
1456	unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1457	return ret;
1458	}
1459
1460	static void __exit mbochs_dev_exit(void)
1461	{
1462	mbochs_dev.bus = NULL;
1463	mdev_unregister_parent(parent: &mbochs_parent);
1464
1465	device_unregister(dev: &mbochs_dev);
1466	mdev_unregister_driver(drv: &mbochs_driver);
1467	cdev_del(&mbochs_cdev);
1468	unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
1469	class_destroy(cls: mbochs_class);
1470	mbochs_class = NULL;
1471	}
1472
1473	MODULE_IMPORT_NS(DMA_BUF);
1474	module_init(mbochs_dev_init)
1475	module_exit(mbochs_dev_exit)
1476