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a5e6e650 GH |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Mediated virtual PCI display host device driver | |
4 | * | |
5 | * Emulate enough of qemu stdvga to make bochs-drm.ko happy. That is | |
6 | * basically the vram memory bar and the bochs dispi interface vbe | |
7 | * registers in the mmio register bar. Specifically it does *not* | |
8 | * include any legacy vga stuff. Device looks a lot like "qemu -device | |
9 | * secondary-vga". | |
10 | * | |
11 | * (c) Gerd Hoffmann <kraxel@redhat.com> | |
12 | * | |
13 | * based on mtty driver which is: | |
14 | * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. | |
15 | * Author: Neo Jia <cjia@nvidia.com> | |
16 | * Kirti Wankhede <kwankhede@nvidia.com> | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License version 2 as | |
20 | * published by the Free Software Foundation. | |
21 | */ | |
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/device.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/vmalloc.h> | |
28 | #include <linux/cdev.h> | |
29 | #include <linux/vfio.h> | |
30 | #include <linux/iommu.h> | |
31 | #include <linux/sysfs.h> | |
32 | #include <linux/mdev.h> | |
33 | #include <linux/pci.h> | |
34 | #include <linux/dma-buf.h> | |
35 | #include <linux/highmem.h> | |
36 | #include <drm/drm_fourcc.h> | |
37 | #include <drm/drm_rect.h> | |
38 | #include <drm/drm_modeset_lock.h> | |
39 | #include <drm/drm_property.h> | |
40 | #include <drm/drm_plane.h> | |
41 | ||
42 | ||
43 | #define VBE_DISPI_INDEX_ID 0x0 | |
44 | #define VBE_DISPI_INDEX_XRES 0x1 | |
45 | #define VBE_DISPI_INDEX_YRES 0x2 | |
46 | #define VBE_DISPI_INDEX_BPP 0x3 | |
47 | #define VBE_DISPI_INDEX_ENABLE 0x4 | |
48 | #define VBE_DISPI_INDEX_BANK 0x5 | |
49 | #define VBE_DISPI_INDEX_VIRT_WIDTH 0x6 | |
50 | #define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7 | |
51 | #define VBE_DISPI_INDEX_X_OFFSET 0x8 | |
52 | #define VBE_DISPI_INDEX_Y_OFFSET 0x9 | |
53 | #define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa | |
54 | #define VBE_DISPI_INDEX_COUNT 0xb | |
55 | ||
56 | #define VBE_DISPI_ID0 0xB0C0 | |
57 | #define VBE_DISPI_ID1 0xB0C1 | |
58 | #define VBE_DISPI_ID2 0xB0C2 | |
59 | #define VBE_DISPI_ID3 0xB0C3 | |
60 | #define VBE_DISPI_ID4 0xB0C4 | |
61 | #define VBE_DISPI_ID5 0xB0C5 | |
62 | ||
63 | #define VBE_DISPI_DISABLED 0x00 | |
64 | #define VBE_DISPI_ENABLED 0x01 | |
65 | #define VBE_DISPI_GETCAPS 0x02 | |
66 | #define VBE_DISPI_8BIT_DAC 0x20 | |
67 | #define VBE_DISPI_LFB_ENABLED 0x40 | |
68 | #define VBE_DISPI_NOCLEARMEM 0x80 | |
69 | ||
70 | ||
71 | #define MBOCHS_NAME "mbochs" | |
72 | #define MBOCHS_CLASS_NAME "mbochs" | |
73 | ||
104c7405 GH |
74 | #define MBOCHS_EDID_REGION_INDEX VFIO_PCI_NUM_REGIONS |
75 | #define MBOCHS_NUM_REGIONS (MBOCHS_EDID_REGION_INDEX+1) | |
76 | ||
a5e6e650 GH |
77 | #define MBOCHS_CONFIG_SPACE_SIZE 0xff |
78 | #define MBOCHS_MMIO_BAR_OFFSET PAGE_SIZE | |
79 | #define MBOCHS_MMIO_BAR_SIZE PAGE_SIZE | |
104c7405 | 80 | #define MBOCHS_EDID_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \ |
a5e6e650 | 81 | MBOCHS_MMIO_BAR_SIZE) |
104c7405 GH |
82 | #define MBOCHS_EDID_SIZE PAGE_SIZE |
83 | #define MBOCHS_MEMORY_BAR_OFFSET (MBOCHS_EDID_OFFSET + \ | |
84 | MBOCHS_EDID_SIZE) | |
85 | ||
86 | #define MBOCHS_EDID_BLOB_OFFSET (MBOCHS_EDID_SIZE/2) | |
a5e6e650 GH |
87 | |
88 | #define STORE_LE16(addr, val) (*(u16 *)addr = val) | |
89 | #define STORE_LE32(addr, val) (*(u32 *)addr = val) | |
90 | ||
91 | ||
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; | |
104c7405 GH |
106 | u32 max_x; |
107 | u32 max_y; | |
a5e6e650 GH |
108 | } mbochs_types[] = { |
109 | { | |
110 | .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1, | |
111 | .mbytes = 4, | |
104c7405 GH |
112 | .max_x = 800, |
113 | .max_y = 600, | |
a5e6e650 GH |
114 | }, { |
115 | .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2, | |
116 | .mbytes = 16, | |
104c7405 GH |
117 | .max_x = 1920, |
118 | .max_y = 1440, | |
a5e6e650 GH |
119 | }, { |
120 | .name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3, | |
121 | .mbytes = 64, | |
104c7405 GH |
122 | .max_x = 0, |
123 | .max_y = 0, | |
a5e6e650 GH |
124 | }, |
125 | }; | |
126 | ||
127 | ||
128 | static dev_t mbochs_devt; | |
129 | static struct class *mbochs_class; | |
130 | static struct cdev mbochs_cdev; | |
131 | static struct device mbochs_dev; | |
de5494af | 132 | static atomic_t mbochs_avail_mbytes; |
681c1615 | 133 | static const struct vfio_device_ops mbochs_dev_ops; |
a5e6e650 | 134 | |
104c7405 GH |
135 | struct vfio_region_info_ext { |
136 | struct vfio_region_info base; | |
137 | struct vfio_region_info_cap_type type; | |
138 | }; | |
139 | ||
a5e6e650 GH |
140 | struct mbochs_mode { |
141 | u32 drm_format; | |
142 | u32 bytepp; | |
143 | u32 width; | |
144 | u32 height; | |
145 | u32 stride; | |
146 | u32 __pad; | |
147 | u64 offset; | |
148 | u64 size; | |
149 | }; | |
150 | ||
151 | struct mbochs_dmabuf { | |
152 | struct mbochs_mode mode; | |
153 | u32 id; | |
154 | struct page **pages; | |
155 | pgoff_t pagecount; | |
156 | struct dma_buf *buf; | |
157 | struct mdev_state *mdev_state; | |
158 | struct list_head next; | |
159 | bool unlinked; | |
160 | }; | |
161 | ||
162 | /* State of each mdev device */ | |
163 | struct mdev_state { | |
681c1615 | 164 | struct vfio_device vdev; |
a5e6e650 GH |
165 | u8 *vconfig; |
166 | u64 bar_mask[3]; | |
167 | u32 memory_bar_mask; | |
168 | struct mutex ops_lock; | |
169 | struct mdev_device *mdev; | |
a5e6e650 GH |
170 | |
171 | const struct mbochs_type *type; | |
172 | u16 vbe[VBE_DISPI_INDEX_COUNT]; | |
173 | u64 memsize; | |
174 | struct page **pages; | |
175 | pgoff_t pagecount; | |
104c7405 GH |
176 | struct vfio_region_gfx_edid edid_regs; |
177 | u8 edid_blob[0x400]; | |
a5e6e650 GH |
178 | |
179 | struct list_head dmabufs; | |
180 | u32 active_id; | |
181 | u32 next_id; | |
182 | }; | |
183 | ||
184 | static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = { | |
185 | [VBE_DISPI_INDEX_ID] = "id", | |
186 | [VBE_DISPI_INDEX_XRES] = "xres", | |
187 | [VBE_DISPI_INDEX_YRES] = "yres", | |
188 | [VBE_DISPI_INDEX_BPP] = "bpp", | |
189 | [VBE_DISPI_INDEX_ENABLE] = "enable", | |
190 | [VBE_DISPI_INDEX_BANK] = "bank", | |
191 | [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width", | |
192 | [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height", | |
193 | [VBE_DISPI_INDEX_X_OFFSET] = "x-offset", | |
194 | [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset", | |
195 | [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem", | |
196 | }; | |
197 | ||
198 | static const char *vbe_name(u32 index) | |
199 | { | |
200 | if (index < ARRAY_SIZE(vbe_name_list)) | |
201 | return vbe_name_list[index]; | |
202 | return "(invalid)"; | |
203 | } | |
204 | ||
498e8bf5 AK |
205 | static struct page *__mbochs_get_page(struct mdev_state *mdev_state, |
206 | pgoff_t pgoff); | |
a5e6e650 GH |
207 | static struct page *mbochs_get_page(struct mdev_state *mdev_state, |
208 | pgoff_t pgoff); | |
209 | ||
a5e6e650 GH |
210 | static void mbochs_create_config_space(struct mdev_state *mdev_state) |
211 | { | |
212 | STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID], | |
213 | 0x1234); | |
214 | STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID], | |
215 | 0x1111); | |
216 | STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID], | |
217 | PCI_SUBVENDOR_ID_REDHAT_QUMRANET); | |
218 | STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID], | |
219 | PCI_SUBDEVICE_ID_QEMU); | |
220 | ||
221 | STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND], | |
222 | PCI_COMMAND_IO | PCI_COMMAND_MEMORY); | |
223 | STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE], | |
224 | PCI_CLASS_DISPLAY_OTHER); | |
225 | mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01; | |
226 | ||
227 | STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0], | |
228 | PCI_BASE_ADDRESS_SPACE_MEMORY | | |
229 | PCI_BASE_ADDRESS_MEM_TYPE_32 | | |
230 | PCI_BASE_ADDRESS_MEM_PREFETCH); | |
231 | mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1; | |
232 | ||
233 | STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2], | |
234 | PCI_BASE_ADDRESS_SPACE_MEMORY | | |
235 | PCI_BASE_ADDRESS_MEM_TYPE_32); | |
236 | mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1; | |
237 | } | |
238 | ||
239 | static int mbochs_check_framebuffer(struct mdev_state *mdev_state, | |
240 | struct mbochs_mode *mode) | |
241 | { | |
242 | struct device *dev = mdev_dev(mdev_state->mdev); | |
243 | u16 *vbe = mdev_state->vbe; | |
244 | u32 virt_width; | |
245 | ||
246 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
247 | ||
248 | if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) | |
249 | goto nofb; | |
250 | ||
251 | memset(mode, 0, sizeof(*mode)); | |
252 | switch (vbe[VBE_DISPI_INDEX_BPP]) { | |
253 | case 32: | |
254 | mode->drm_format = DRM_FORMAT_XRGB8888; | |
255 | mode->bytepp = 4; | |
256 | break; | |
257 | default: | |
258 | dev_info_ratelimited(dev, "%s: bpp %d not supported\n", | |
259 | __func__, vbe[VBE_DISPI_INDEX_BPP]); | |
260 | goto nofb; | |
261 | } | |
262 | ||
263 | mode->width = vbe[VBE_DISPI_INDEX_XRES]; | |
264 | mode->height = vbe[VBE_DISPI_INDEX_YRES]; | |
265 | virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH]; | |
266 | if (virt_width < mode->width) | |
267 | virt_width = mode->width; | |
268 | mode->stride = virt_width * mode->bytepp; | |
269 | mode->size = (u64)mode->stride * mode->height; | |
270 | mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp + | |
271 | (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride); | |
272 | ||
273 | if (mode->width < 64 || mode->height < 64) { | |
274 | dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n", | |
275 | __func__, mode->width, mode->height); | |
276 | goto nofb; | |
277 | } | |
278 | if (mode->offset + mode->size > mdev_state->memsize) { | |
279 | dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n", | |
280 | __func__); | |
281 | goto nofb; | |
282 | } | |
283 | ||
284 | return 0; | |
285 | ||
286 | nofb: | |
287 | memset(mode, 0, sizeof(*mode)); | |
288 | return -EINVAL; | |
289 | } | |
290 | ||
291 | static bool mbochs_modes_equal(struct mbochs_mode *mode1, | |
292 | struct mbochs_mode *mode2) | |
293 | { | |
294 | return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0; | |
295 | } | |
296 | ||
297 | static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset, | |
298 | char *buf, u32 count) | |
299 | { | |
300 | struct device *dev = mdev_dev(mdev_state->mdev); | |
301 | int index = (offset - PCI_BASE_ADDRESS_0) / 0x04; | |
302 | u32 cfg_addr; | |
303 | ||
304 | switch (offset) { | |
305 | case PCI_BASE_ADDRESS_0: | |
306 | case PCI_BASE_ADDRESS_2: | |
307 | cfg_addr = *(u32 *)buf; | |
308 | ||
309 | if (cfg_addr == 0xffffffff) { | |
310 | cfg_addr = (cfg_addr & mdev_state->bar_mask[index]); | |
311 | } else { | |
312 | cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK; | |
313 | if (cfg_addr) | |
314 | dev_info(dev, "BAR #%d @ 0x%x\n", | |
315 | index, cfg_addr); | |
316 | } | |
317 | ||
318 | cfg_addr |= (mdev_state->vconfig[offset] & | |
319 | ~PCI_BASE_ADDRESS_MEM_MASK); | |
320 | STORE_LE32(&mdev_state->vconfig[offset], cfg_addr); | |
321 | break; | |
322 | } | |
323 | } | |
324 | ||
325 | static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset, | |
326 | char *buf, u32 count) | |
327 | { | |
328 | struct device *dev = mdev_dev(mdev_state->mdev); | |
329 | int index; | |
330 | u16 reg16; | |
331 | ||
332 | switch (offset) { | |
333 | case 0x400 ... 0x41f: /* vga ioports remapped */ | |
334 | goto unhandled; | |
335 | case 0x500 ... 0x515: /* bochs dispi interface */ | |
336 | if (count != 2) | |
337 | goto unhandled; | |
338 | index = (offset - 0x500) / 2; | |
339 | reg16 = *(u16 *)buf; | |
340 | if (index < ARRAY_SIZE(mdev_state->vbe)) | |
341 | mdev_state->vbe[index] = reg16; | |
342 | dev_dbg(dev, "%s: vbe write %d = %d (%s)\n", | |
343 | __func__, index, reg16, vbe_name(index)); | |
344 | break; | |
345 | case 0x600 ... 0x607: /* qemu extended regs */ | |
346 | goto unhandled; | |
347 | default: | |
348 | unhandled: | |
349 | dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", | |
350 | __func__, offset, count); | |
351 | break; | |
352 | } | |
353 | } | |
354 | ||
355 | static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset, | |
356 | char *buf, u32 count) | |
357 | { | |
358 | struct device *dev = mdev_dev(mdev_state->mdev); | |
104c7405 | 359 | struct vfio_region_gfx_edid *edid; |
a5e6e650 GH |
360 | u16 reg16 = 0; |
361 | int index; | |
362 | ||
363 | switch (offset) { | |
104c7405 GH |
364 | case 0x000 ... 0x3ff: /* edid block */ |
365 | edid = &mdev_state->edid_regs; | |
366 | if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP || | |
367 | offset >= edid->edid_size) { | |
368 | memset(buf, 0, count); | |
369 | break; | |
370 | } | |
371 | memcpy(buf, mdev_state->edid_blob + offset, count); | |
372 | break; | |
a5e6e650 GH |
373 | case 0x500 ... 0x515: /* bochs dispi interface */ |
374 | if (count != 2) | |
375 | goto unhandled; | |
376 | index = (offset - 0x500) / 2; | |
377 | if (index < ARRAY_SIZE(mdev_state->vbe)) | |
378 | reg16 = mdev_state->vbe[index]; | |
379 | dev_dbg(dev, "%s: vbe read %d = %d (%s)\n", | |
380 | __func__, index, reg16, vbe_name(index)); | |
381 | *(u16 *)buf = reg16; | |
382 | break; | |
383 | default: | |
384 | unhandled: | |
385 | dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", | |
386 | __func__, offset, count); | |
387 | memset(buf, 0, count); | |
388 | break; | |
389 | } | |
390 | } | |
391 | ||
104c7405 GH |
392 | static void handle_edid_regs(struct mdev_state *mdev_state, u16 offset, |
393 | char *buf, u32 count, bool is_write) | |
394 | { | |
395 | char *regs = (void *)&mdev_state->edid_regs; | |
396 | ||
397 | if (offset + count > sizeof(mdev_state->edid_regs)) | |
398 | return; | |
399 | if (count != 4) | |
400 | return; | |
401 | if (offset % 4) | |
402 | return; | |
403 | ||
404 | if (is_write) { | |
405 | switch (offset) { | |
406 | case offsetof(struct vfio_region_gfx_edid, link_state): | |
407 | case offsetof(struct vfio_region_gfx_edid, edid_size): | |
408 | memcpy(regs + offset, buf, count); | |
409 | break; | |
410 | default: | |
411 | /* read-only regs */ | |
412 | break; | |
413 | } | |
414 | } else { | |
415 | memcpy(buf, regs + offset, count); | |
416 | } | |
417 | } | |
418 | ||
419 | static void handle_edid_blob(struct mdev_state *mdev_state, u16 offset, | |
420 | char *buf, u32 count, bool is_write) | |
421 | { | |
422 | if (offset + count > mdev_state->edid_regs.edid_max_size) | |
423 | return; | |
424 | if (is_write) | |
425 | memcpy(mdev_state->edid_blob + offset, buf, count); | |
426 | else | |
427 | memcpy(buf, mdev_state->edid_blob + offset, count); | |
428 | } | |
429 | ||
681c1615 JG |
430 | static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf, |
431 | size_t count, loff_t pos, bool is_write) | |
a5e6e650 | 432 | { |
a5e6e650 GH |
433 | struct page *pg; |
434 | loff_t poff; | |
435 | char *map; | |
436 | int ret = 0; | |
437 | ||
438 | mutex_lock(&mdev_state->ops_lock); | |
439 | ||
440 | if (pos < MBOCHS_CONFIG_SPACE_SIZE) { | |
441 | if (is_write) | |
442 | handle_pci_cfg_write(mdev_state, pos, buf, count); | |
443 | else | |
444 | memcpy(buf, (mdev_state->vconfig + pos), count); | |
445 | ||
446 | } else if (pos >= MBOCHS_MMIO_BAR_OFFSET && | |
104c7405 GH |
447 | pos + count <= (MBOCHS_MMIO_BAR_OFFSET + |
448 | MBOCHS_MMIO_BAR_SIZE)) { | |
a5e6e650 GH |
449 | pos -= MBOCHS_MMIO_BAR_OFFSET; |
450 | if (is_write) | |
451 | handle_mmio_write(mdev_state, pos, buf, count); | |
452 | else | |
453 | handle_mmio_read(mdev_state, pos, buf, count); | |
454 | ||
104c7405 GH |
455 | } else if (pos >= MBOCHS_EDID_OFFSET && |
456 | pos + count <= (MBOCHS_EDID_OFFSET + | |
457 | MBOCHS_EDID_SIZE)) { | |
458 | pos -= MBOCHS_EDID_OFFSET; | |
459 | if (pos < MBOCHS_EDID_BLOB_OFFSET) { | |
460 | handle_edid_regs(mdev_state, pos, buf, count, is_write); | |
461 | } else { | |
462 | pos -= MBOCHS_EDID_BLOB_OFFSET; | |
463 | handle_edid_blob(mdev_state, pos, buf, count, is_write); | |
464 | } | |
465 | ||
a5e6e650 GH |
466 | } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET && |
467 | pos + count <= | |
468 | MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) { | |
469 | pos -= MBOCHS_MMIO_BAR_OFFSET; | |
470 | poff = pos & ~PAGE_MASK; | |
498e8bf5 | 471 | pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT); |
a5e6e650 GH |
472 | map = kmap(pg); |
473 | if (is_write) | |
474 | memcpy(map + poff, buf, count); | |
475 | else | |
476 | memcpy(buf, map + poff, count); | |
477 | kunmap(pg); | |
478 | put_page(pg); | |
479 | ||
480 | } else { | |
681c1615 | 481 | dev_dbg(mdev_state->vdev.dev, "%s: %s @0x%llx (unhandled)\n", |
a5e6e650 GH |
482 | __func__, is_write ? "WR" : "RD", pos); |
483 | ret = -1; | |
484 | goto accessfailed; | |
485 | } | |
486 | ||
487 | ret = count; | |
488 | ||
489 | ||
490 | accessfailed: | |
491 | mutex_unlock(&mdev_state->ops_lock); | |
492 | ||
493 | return ret; | |
494 | } | |
495 | ||
681c1615 | 496 | static int mbochs_reset(struct mdev_state *mdev_state) |
a5e6e650 | 497 | { |
a5e6e650 GH |
498 | u32 size64k = mdev_state->memsize / (64 * 1024); |
499 | int i; | |
500 | ||
501 | for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++) | |
502 | mdev_state->vbe[i] = 0; | |
503 | mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5; | |
504 | mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k; | |
505 | return 0; | |
506 | } | |
507 | ||
681c1615 | 508 | static int mbochs_probe(struct mdev_device *mdev) |
a5e6e650 | 509 | { |
de5494af | 510 | int avail_mbytes = atomic_read(&mbochs_avail_mbytes); |
3d3a360e JG |
511 | const struct mbochs_type *type = |
512 | &mbochs_types[mdev_get_type_group_id(mdev)]; | |
a5e6e650 GH |
513 | struct device *dev = mdev_dev(mdev); |
514 | struct mdev_state *mdev_state; | |
681c1615 | 515 | int ret = -ENOMEM; |
a5e6e650 | 516 | |
de5494af JG |
517 | do { |
518 | if (avail_mbytes < type->mbytes) | |
519 | return -ENOSPC; | |
520 | } while (!atomic_try_cmpxchg(&mbochs_avail_mbytes, &avail_mbytes, | |
521 | avail_mbytes - type->mbytes)); | |
a5e6e650 GH |
522 | |
523 | mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL); | |
524 | if (mdev_state == NULL) | |
de5494af | 525 | goto err_avail; |
681c1615 | 526 | vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mbochs_dev_ops); |
a5e6e650 GH |
527 | |
528 | mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL); | |
529 | if (mdev_state->vconfig == NULL) | |
530 | goto err_mem; | |
531 | ||
532 | mdev_state->memsize = type->mbytes * 1024 * 1024; | |
533 | mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT; | |
534 | mdev_state->pages = kcalloc(mdev_state->pagecount, | |
535 | sizeof(struct page *), | |
536 | GFP_KERNEL); | |
537 | if (!mdev_state->pages) | |
538 | goto err_mem; | |
539 | ||
540 | dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__, | |
3d3a360e | 541 | type->name, type->mbytes, mdev_state->pagecount); |
a5e6e650 GH |
542 | |
543 | mutex_init(&mdev_state->ops_lock); | |
544 | mdev_state->mdev = mdev; | |
a5e6e650 GH |
545 | INIT_LIST_HEAD(&mdev_state->dmabufs); |
546 | mdev_state->next_id = 1; | |
547 | ||
548 | mdev_state->type = type; | |
104c7405 GH |
549 | mdev_state->edid_regs.max_xres = type->max_x; |
550 | mdev_state->edid_regs.max_yres = type->max_y; | |
551 | mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET; | |
552 | mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob); | |
a5e6e650 | 553 | mbochs_create_config_space(mdev_state); |
681c1615 | 554 | mbochs_reset(mdev_state); |
a5e6e650 | 555 | |
681c1615 JG |
556 | ret = vfio_register_group_dev(&mdev_state->vdev); |
557 | if (ret) | |
558 | goto err_mem; | |
559 | dev_set_drvdata(&mdev->dev, mdev_state); | |
a5e6e650 | 560 | return 0; |
a5e6e650 | 561 | err_mem: |
ae03c377 | 562 | vfio_uninit_group_dev(&mdev_state->vdev); |
de5494af | 563 | kfree(mdev_state->pages); |
a5e6e650 GH |
564 | kfree(mdev_state->vconfig); |
565 | kfree(mdev_state); | |
de5494af JG |
566 | err_avail: |
567 | atomic_add(type->mbytes, &mbochs_avail_mbytes); | |
681c1615 | 568 | return ret; |
a5e6e650 GH |
569 | } |
570 | ||
681c1615 | 571 | static void mbochs_remove(struct mdev_device *mdev) |
a5e6e650 | 572 | { |
681c1615 | 573 | struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev); |
a5e6e650 | 574 | |
681c1615 | 575 | vfio_unregister_group_dev(&mdev_state->vdev); |
ae03c377 | 576 | vfio_uninit_group_dev(&mdev_state->vdev); |
de5494af | 577 | atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes); |
a5e6e650 GH |
578 | kfree(mdev_state->pages); |
579 | kfree(mdev_state->vconfig); | |
580 | kfree(mdev_state); | |
a5e6e650 GH |
581 | } |
582 | ||
681c1615 | 583 | static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf, |
a5e6e650 GH |
584 | size_t count, loff_t *ppos) |
585 | { | |
681c1615 JG |
586 | struct mdev_state *mdev_state = |
587 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 GH |
588 | unsigned int done = 0; |
589 | int ret; | |
590 | ||
591 | while (count) { | |
592 | size_t filled; | |
593 | ||
594 | if (count >= 4 && !(*ppos % 4)) { | |
595 | u32 val; | |
596 | ||
681c1615 | 597 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
598 | *ppos, false); |
599 | if (ret <= 0) | |
600 | goto read_err; | |
601 | ||
602 | if (copy_to_user(buf, &val, sizeof(val))) | |
603 | goto read_err; | |
604 | ||
605 | filled = 4; | |
606 | } else if (count >= 2 && !(*ppos % 2)) { | |
607 | u16 val; | |
608 | ||
681c1615 | 609 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
610 | *ppos, false); |
611 | if (ret <= 0) | |
612 | goto read_err; | |
613 | ||
614 | if (copy_to_user(buf, &val, sizeof(val))) | |
615 | goto read_err; | |
616 | ||
617 | filled = 2; | |
618 | } else { | |
619 | u8 val; | |
620 | ||
681c1615 | 621 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
622 | *ppos, false); |
623 | if (ret <= 0) | |
624 | goto read_err; | |
625 | ||
626 | if (copy_to_user(buf, &val, sizeof(val))) | |
627 | goto read_err; | |
628 | ||
629 | filled = 1; | |
630 | } | |
631 | ||
632 | count -= filled; | |
633 | done += filled; | |
634 | *ppos += filled; | |
635 | buf += filled; | |
636 | } | |
637 | ||
638 | return done; | |
639 | ||
640 | read_err: | |
641 | return -EFAULT; | |
642 | } | |
643 | ||
681c1615 | 644 | static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf, |
a5e6e650 GH |
645 | size_t count, loff_t *ppos) |
646 | { | |
681c1615 JG |
647 | struct mdev_state *mdev_state = |
648 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 GH |
649 | unsigned int done = 0; |
650 | int ret; | |
651 | ||
652 | while (count) { | |
653 | size_t filled; | |
654 | ||
655 | if (count >= 4 && !(*ppos % 4)) { | |
656 | u32 val; | |
657 | ||
658 | if (copy_from_user(&val, buf, sizeof(val))) | |
659 | goto write_err; | |
660 | ||
681c1615 | 661 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
662 | *ppos, true); |
663 | if (ret <= 0) | |
664 | goto write_err; | |
665 | ||
666 | filled = 4; | |
667 | } else if (count >= 2 && !(*ppos % 2)) { | |
668 | u16 val; | |
669 | ||
670 | if (copy_from_user(&val, buf, sizeof(val))) | |
671 | goto write_err; | |
672 | ||
681c1615 | 673 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
674 | *ppos, true); |
675 | if (ret <= 0) | |
676 | goto write_err; | |
677 | ||
678 | filled = 2; | |
679 | } else { | |
680 | u8 val; | |
681 | ||
682 | if (copy_from_user(&val, buf, sizeof(val))) | |
683 | goto write_err; | |
684 | ||
681c1615 | 685 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
686 | *ppos, true); |
687 | if (ret <= 0) | |
688 | goto write_err; | |
689 | ||
690 | filled = 1; | |
691 | } | |
692 | count -= filled; | |
693 | done += filled; | |
694 | *ppos += filled; | |
695 | buf += filled; | |
696 | } | |
697 | ||
698 | return done; | |
699 | write_err: | |
700 | return -EFAULT; | |
701 | } | |
702 | ||
703 | static struct page *__mbochs_get_page(struct mdev_state *mdev_state, | |
704 | pgoff_t pgoff) | |
705 | { | |
706 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
707 | ||
708 | if (!mdev_state->pages[pgoff]) { | |
709 | mdev_state->pages[pgoff] = | |
710 | alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0); | |
711 | if (!mdev_state->pages[pgoff]) | |
712 | return NULL; | |
713 | } | |
714 | ||
715 | get_page(mdev_state->pages[pgoff]); | |
716 | return mdev_state->pages[pgoff]; | |
717 | } | |
718 | ||
719 | static struct page *mbochs_get_page(struct mdev_state *mdev_state, | |
720 | pgoff_t pgoff) | |
721 | { | |
722 | struct page *page; | |
723 | ||
724 | if (WARN_ON(pgoff >= mdev_state->pagecount)) | |
725 | return NULL; | |
726 | ||
727 | mutex_lock(&mdev_state->ops_lock); | |
728 | page = __mbochs_get_page(mdev_state, pgoff); | |
729 | mutex_unlock(&mdev_state->ops_lock); | |
730 | ||
731 | return page; | |
732 | } | |
733 | ||
734 | static void mbochs_put_pages(struct mdev_state *mdev_state) | |
735 | { | |
736 | struct device *dev = mdev_dev(mdev_state->mdev); | |
737 | int i, count = 0; | |
738 | ||
739 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
740 | ||
741 | for (i = 0; i < mdev_state->pagecount; i++) { | |
742 | if (!mdev_state->pages[i]) | |
743 | continue; | |
744 | put_page(mdev_state->pages[i]); | |
745 | mdev_state->pages[i] = NULL; | |
746 | count++; | |
747 | } | |
748 | dev_dbg(dev, "%s: %d pages released\n", __func__, count); | |
749 | } | |
750 | ||
d7ef4899 | 751 | static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf) |
a5e6e650 GH |
752 | { |
753 | struct vm_area_struct *vma = vmf->vma; | |
754 | struct mdev_state *mdev_state = vma->vm_private_data; | |
755 | pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; | |
756 | ||
757 | if (page_offset >= mdev_state->pagecount) | |
758 | return VM_FAULT_SIGBUS; | |
759 | ||
760 | vmf->page = mbochs_get_page(mdev_state, page_offset); | |
761 | if (!vmf->page) | |
762 | return VM_FAULT_SIGBUS; | |
763 | ||
764 | return 0; | |
765 | } | |
766 | ||
767 | static const struct vm_operations_struct mbochs_region_vm_ops = { | |
768 | .fault = mbochs_region_vm_fault, | |
769 | }; | |
770 | ||
681c1615 | 771 | static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma) |
a5e6e650 | 772 | { |
681c1615 JG |
773 | struct mdev_state *mdev_state = |
774 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 GH |
775 | |
776 | if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT) | |
777 | return -EINVAL; | |
778 | if (vma->vm_end < vma->vm_start) | |
779 | return -EINVAL; | |
780 | if (vma->vm_end - vma->vm_start > mdev_state->memsize) | |
781 | return -EINVAL; | |
782 | if ((vma->vm_flags & VM_SHARED) == 0) | |
783 | return -EINVAL; | |
784 | ||
785 | vma->vm_ops = &mbochs_region_vm_ops; | |
786 | vma->vm_private_data = mdev_state; | |
787 | return 0; | |
788 | } | |
789 | ||
d7ef4899 | 790 | static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf) |
a5e6e650 GH |
791 | { |
792 | struct vm_area_struct *vma = vmf->vma; | |
793 | struct mbochs_dmabuf *dmabuf = vma->vm_private_data; | |
794 | ||
795 | if (WARN_ON(vmf->pgoff >= dmabuf->pagecount)) | |
796 | return VM_FAULT_SIGBUS; | |
797 | ||
798 | vmf->page = dmabuf->pages[vmf->pgoff]; | |
799 | get_page(vmf->page); | |
800 | return 0; | |
801 | } | |
802 | ||
803 | static const struct vm_operations_struct mbochs_dmabuf_vm_ops = { | |
804 | .fault = mbochs_dmabuf_vm_fault, | |
805 | }; | |
806 | ||
807 | static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma) | |
808 | { | |
809 | struct mbochs_dmabuf *dmabuf = buf->priv; | |
810 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
811 | ||
812 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
813 | ||
814 | if ((vma->vm_flags & VM_SHARED) == 0) | |
815 | return -EINVAL; | |
816 | ||
817 | vma->vm_ops = &mbochs_dmabuf_vm_ops; | |
818 | vma->vm_private_data = dmabuf; | |
819 | return 0; | |
820 | } | |
821 | ||
822 | static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf, | |
823 | const char *prefix) | |
824 | { | |
825 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
826 | u32 fourcc = dmabuf->mode.drm_format; | |
827 | ||
828 | dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n", | |
829 | prefix, dmabuf->id, | |
830 | fourcc ? ((fourcc >> 0) & 0xff) : '-', | |
831 | fourcc ? ((fourcc >> 8) & 0xff) : '-', | |
832 | fourcc ? ((fourcc >> 16) & 0xff) : '-', | |
833 | fourcc ? ((fourcc >> 24) & 0xff) : '-', | |
834 | dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride, | |
835 | dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount); | |
836 | } | |
837 | ||
838 | static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at, | |
839 | enum dma_data_direction direction) | |
840 | { | |
841 | struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; | |
842 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
843 | struct sg_table *sg; | |
844 | ||
845 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
846 | ||
847 | sg = kzalloc(sizeof(*sg), GFP_KERNEL); | |
848 | if (!sg) | |
849 | goto err1; | |
850 | if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount, | |
851 | 0, dmabuf->mode.size, GFP_KERNEL) < 0) | |
852 | goto err2; | |
be0704be | 853 | if (dma_map_sgtable(at->dev, sg, direction, 0)) |
a5e6e650 GH |
854 | goto err3; |
855 | ||
856 | return sg; | |
857 | ||
858 | err3: | |
859 | sg_free_table(sg); | |
860 | err2: | |
861 | kfree(sg); | |
862 | err1: | |
863 | return ERR_PTR(-ENOMEM); | |
864 | } | |
865 | ||
866 | static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at, | |
867 | struct sg_table *sg, | |
868 | enum dma_data_direction direction) | |
869 | { | |
870 | struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; | |
871 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
872 | ||
873 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
874 | ||
be0704be | 875 | dma_unmap_sgtable(at->dev, sg, direction, 0); |
a5e6e650 GH |
876 | sg_free_table(sg); |
877 | kfree(sg); | |
878 | } | |
879 | ||
880 | static void mbochs_release_dmabuf(struct dma_buf *buf) | |
881 | { | |
882 | struct mbochs_dmabuf *dmabuf = buf->priv; | |
883 | struct mdev_state *mdev_state = dmabuf->mdev_state; | |
884 | struct device *dev = mdev_dev(mdev_state->mdev); | |
885 | pgoff_t pg; | |
886 | ||
887 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
888 | ||
889 | for (pg = 0; pg < dmabuf->pagecount; pg++) | |
890 | put_page(dmabuf->pages[pg]); | |
891 | ||
892 | mutex_lock(&mdev_state->ops_lock); | |
893 | dmabuf->buf = NULL; | |
894 | if (dmabuf->unlinked) | |
895 | kfree(dmabuf); | |
896 | mutex_unlock(&mdev_state->ops_lock); | |
897 | } | |
898 | ||
a5e6e650 GH |
899 | static struct dma_buf_ops mbochs_dmabuf_ops = { |
900 | .map_dma_buf = mbochs_map_dmabuf, | |
901 | .unmap_dma_buf = mbochs_unmap_dmabuf, | |
902 | .release = mbochs_release_dmabuf, | |
a5e6e650 GH |
903 | .mmap = mbochs_mmap_dmabuf, |
904 | }; | |
905 | ||
906 | static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state, | |
907 | struct mbochs_mode *mode) | |
908 | { | |
909 | struct mbochs_dmabuf *dmabuf; | |
910 | pgoff_t page_offset, pg; | |
911 | ||
912 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
913 | ||
914 | dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL); | |
915 | if (!dmabuf) | |
916 | return NULL; | |
917 | ||
918 | dmabuf->mode = *mode; | |
919 | dmabuf->id = mdev_state->next_id++; | |
920 | dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE); | |
921 | dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *), | |
922 | GFP_KERNEL); | |
923 | if (!dmabuf->pages) | |
924 | goto err_free_dmabuf; | |
925 | ||
926 | page_offset = dmabuf->mode.offset >> PAGE_SHIFT; | |
927 | for (pg = 0; pg < dmabuf->pagecount; pg++) { | |
928 | dmabuf->pages[pg] = __mbochs_get_page(mdev_state, | |
929 | page_offset + pg); | |
930 | if (!dmabuf->pages[pg]) | |
931 | goto err_free_pages; | |
932 | } | |
933 | ||
934 | dmabuf->mdev_state = mdev_state; | |
935 | list_add(&dmabuf->next, &mdev_state->dmabufs); | |
936 | ||
937 | mbochs_print_dmabuf(dmabuf, __func__); | |
938 | return dmabuf; | |
939 | ||
940 | err_free_pages: | |
941 | while (pg > 0) | |
942 | put_page(dmabuf->pages[--pg]); | |
943 | kfree(dmabuf->pages); | |
944 | err_free_dmabuf: | |
945 | kfree(dmabuf); | |
946 | return NULL; | |
947 | } | |
948 | ||
949 | static struct mbochs_dmabuf * | |
950 | mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state, | |
951 | struct mbochs_mode *mode) | |
952 | { | |
953 | struct mbochs_dmabuf *dmabuf; | |
954 | ||
955 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
956 | ||
957 | list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) | |
958 | if (mbochs_modes_equal(&dmabuf->mode, mode)) | |
959 | return dmabuf; | |
960 | ||
961 | return NULL; | |
962 | } | |
963 | ||
964 | static struct mbochs_dmabuf * | |
965 | mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id) | |
966 | { | |
967 | struct mbochs_dmabuf *dmabuf; | |
968 | ||
969 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
970 | ||
971 | list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) | |
972 | if (dmabuf->id == id) | |
973 | return dmabuf; | |
974 | ||
975 | return NULL; | |
976 | } | |
977 | ||
978 | static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf) | |
979 | { | |
980 | struct mdev_state *mdev_state = dmabuf->mdev_state; | |
681c1615 | 981 | struct device *dev = mdev_state->vdev.dev; |
a5e6e650 GH |
982 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
983 | struct dma_buf *buf; | |
984 | ||
985 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
986 | ||
987 | if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) { | |
988 | dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n", | |
989 | __func__); | |
990 | return -EINVAL; | |
991 | } | |
992 | ||
993 | exp_info.ops = &mbochs_dmabuf_ops; | |
994 | exp_info.size = dmabuf->mode.size; | |
995 | exp_info.priv = dmabuf; | |
996 | ||
997 | buf = dma_buf_export(&exp_info); | |
998 | if (IS_ERR(buf)) { | |
999 | dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n", | |
1000 | __func__, PTR_ERR(buf)); | |
1001 | return PTR_ERR(buf); | |
1002 | } | |
1003 | ||
1004 | dmabuf->buf = buf; | |
1005 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
1006 | return 0; | |
1007 | } | |
1008 | ||
681c1615 | 1009 | static int mbochs_get_region_info(struct mdev_state *mdev_state, |
104c7405 | 1010 | struct vfio_region_info_ext *ext) |
a5e6e650 | 1011 | { |
104c7405 | 1012 | struct vfio_region_info *region_info = &ext->base; |
a5e6e650 | 1013 | |
104c7405 | 1014 | if (region_info->index >= MBOCHS_NUM_REGIONS) |
a5e6e650 GH |
1015 | return -EINVAL; |
1016 | ||
1017 | switch (region_info->index) { | |
1018 | case VFIO_PCI_CONFIG_REGION_INDEX: | |
1019 | region_info->offset = 0; | |
1020 | region_info->size = MBOCHS_CONFIG_SPACE_SIZE; | |
1021 | region_info->flags = (VFIO_REGION_INFO_FLAG_READ | | |
1022 | VFIO_REGION_INFO_FLAG_WRITE); | |
1023 | break; | |
1024 | case VFIO_PCI_BAR0_REGION_INDEX: | |
1025 | region_info->offset = MBOCHS_MEMORY_BAR_OFFSET; | |
1026 | region_info->size = mdev_state->memsize; | |
1027 | region_info->flags = (VFIO_REGION_INFO_FLAG_READ | | |
1028 | VFIO_REGION_INFO_FLAG_WRITE | | |
1029 | VFIO_REGION_INFO_FLAG_MMAP); | |
1030 | break; | |
1031 | case VFIO_PCI_BAR2_REGION_INDEX: | |
1032 | region_info->offset = MBOCHS_MMIO_BAR_OFFSET; | |
1033 | region_info->size = MBOCHS_MMIO_BAR_SIZE; | |
1034 | region_info->flags = (VFIO_REGION_INFO_FLAG_READ | | |
1035 | VFIO_REGION_INFO_FLAG_WRITE); | |
1036 | break; | |
104c7405 GH |
1037 | case MBOCHS_EDID_REGION_INDEX: |
1038 | ext->base.argsz = sizeof(*ext); | |
1039 | ext->base.offset = MBOCHS_EDID_OFFSET; | |
1040 | ext->base.size = MBOCHS_EDID_SIZE; | |
1041 | ext->base.flags = (VFIO_REGION_INFO_FLAG_READ | | |
1042 | VFIO_REGION_INFO_FLAG_WRITE | | |
1043 | VFIO_REGION_INFO_FLAG_CAPS); | |
1044 | ext->base.cap_offset = offsetof(typeof(*ext), type); | |
1045 | ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE; | |
1046 | ext->type.header.version = 1; | |
1047 | ext->type.header.next = 0; | |
1048 | ext->type.type = VFIO_REGION_TYPE_GFX; | |
1049 | ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID; | |
1050 | break; | |
a5e6e650 GH |
1051 | default: |
1052 | region_info->size = 0; | |
1053 | region_info->offset = 0; | |
1054 | region_info->flags = 0; | |
1055 | } | |
1056 | ||
1057 | return 0; | |
1058 | } | |
1059 | ||
681c1615 | 1060 | static int mbochs_get_irq_info(struct vfio_irq_info *irq_info) |
a5e6e650 GH |
1061 | { |
1062 | irq_info->count = 0; | |
1063 | return 0; | |
1064 | } | |
1065 | ||
681c1615 | 1066 | static int mbochs_get_device_info(struct vfio_device_info *dev_info) |
a5e6e650 GH |
1067 | { |
1068 | dev_info->flags = VFIO_DEVICE_FLAGS_PCI; | |
104c7405 | 1069 | dev_info->num_regions = MBOCHS_NUM_REGIONS; |
a5e6e650 GH |
1070 | dev_info->num_irqs = VFIO_PCI_NUM_IRQS; |
1071 | return 0; | |
1072 | } | |
1073 | ||
681c1615 | 1074 | static int mbochs_query_gfx_plane(struct mdev_state *mdev_state, |
a5e6e650 GH |
1075 | struct vfio_device_gfx_plane_info *plane) |
1076 | { | |
a5e6e650 GH |
1077 | struct mbochs_dmabuf *dmabuf; |
1078 | struct mbochs_mode mode; | |
1079 | int ret; | |
1080 | ||
1081 | if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) { | |
1082 | if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE | | |
1083 | VFIO_GFX_PLANE_TYPE_DMABUF)) | |
1084 | return 0; | |
1085 | return -EINVAL; | |
1086 | } | |
1087 | ||
1088 | if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF) | |
1089 | return -EINVAL; | |
1090 | ||
1091 | plane->drm_format_mod = 0; | |
1092 | plane->x_pos = 0; | |
1093 | plane->y_pos = 0; | |
1094 | plane->x_hot = 0; | |
1095 | plane->y_hot = 0; | |
1096 | ||
1097 | mutex_lock(&mdev_state->ops_lock); | |
1098 | ||
1099 | ret = -EINVAL; | |
1100 | if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY) | |
1101 | ret = mbochs_check_framebuffer(mdev_state, &mode); | |
1102 | if (ret < 0) { | |
1103 | plane->drm_format = 0; | |
1104 | plane->width = 0; | |
1105 | plane->height = 0; | |
1106 | plane->stride = 0; | |
1107 | plane->size = 0; | |
1108 | plane->dmabuf_id = 0; | |
1109 | goto done; | |
1110 | } | |
1111 | ||
1112 | dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode); | |
1113 | if (!dmabuf) | |
1114 | mbochs_dmabuf_alloc(mdev_state, &mode); | |
1115 | if (!dmabuf) { | |
1116 | mutex_unlock(&mdev_state->ops_lock); | |
1117 | return -ENOMEM; | |
1118 | } | |
1119 | ||
1120 | plane->drm_format = dmabuf->mode.drm_format; | |
1121 | plane->width = dmabuf->mode.width; | |
1122 | plane->height = dmabuf->mode.height; | |
1123 | plane->stride = dmabuf->mode.stride; | |
1124 | plane->size = dmabuf->mode.size; | |
1125 | plane->dmabuf_id = dmabuf->id; | |
1126 | ||
1127 | done: | |
1128 | if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY && | |
1129 | mdev_state->active_id != plane->dmabuf_id) { | |
681c1615 JG |
1130 | dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n", |
1131 | __func__, mdev_state->active_id, plane->dmabuf_id); | |
a5e6e650 GH |
1132 | mdev_state->active_id = plane->dmabuf_id; |
1133 | } | |
1134 | mutex_unlock(&mdev_state->ops_lock); | |
1135 | return 0; | |
1136 | } | |
1137 | ||
681c1615 | 1138 | static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id) |
a5e6e650 | 1139 | { |
a5e6e650 GH |
1140 | struct mbochs_dmabuf *dmabuf; |
1141 | ||
1142 | mutex_lock(&mdev_state->ops_lock); | |
1143 | ||
1144 | dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id); | |
1145 | if (!dmabuf) { | |
1146 | mutex_unlock(&mdev_state->ops_lock); | |
1147 | return -ENOENT; | |
1148 | } | |
1149 | ||
1150 | if (!dmabuf->buf) | |
1151 | mbochs_dmabuf_export(dmabuf); | |
1152 | ||
1153 | mutex_unlock(&mdev_state->ops_lock); | |
1154 | ||
1155 | if (!dmabuf->buf) | |
1156 | return -EINVAL; | |
1157 | ||
1158 | return dma_buf_fd(dmabuf->buf, 0); | |
1159 | } | |
1160 | ||
681c1615 JG |
1161 | static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd, |
1162 | unsigned long arg) | |
a5e6e650 | 1163 | { |
681c1615 JG |
1164 | struct mdev_state *mdev_state = |
1165 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 | 1166 | int ret = 0; |
104c7405 | 1167 | unsigned long minsz, outsz; |
a5e6e650 GH |
1168 | |
1169 | switch (cmd) { | |
1170 | case VFIO_DEVICE_GET_INFO: | |
1171 | { | |
1172 | struct vfio_device_info info; | |
1173 | ||
1174 | minsz = offsetofend(struct vfio_device_info, num_irqs); | |
1175 | ||
1176 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1177 | return -EFAULT; | |
1178 | ||
1179 | if (info.argsz < minsz) | |
1180 | return -EINVAL; | |
1181 | ||
681c1615 | 1182 | ret = mbochs_get_device_info(&info); |
a5e6e650 GH |
1183 | if (ret) |
1184 | return ret; | |
1185 | ||
a5e6e650 GH |
1186 | if (copy_to_user((void __user *)arg, &info, minsz)) |
1187 | return -EFAULT; | |
1188 | ||
1189 | return 0; | |
1190 | } | |
1191 | case VFIO_DEVICE_GET_REGION_INFO: | |
1192 | { | |
104c7405 | 1193 | struct vfio_region_info_ext info; |
a5e6e650 | 1194 | |
104c7405 | 1195 | minsz = offsetofend(typeof(info), base.offset); |
a5e6e650 GH |
1196 | |
1197 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1198 | return -EFAULT; | |
1199 | ||
104c7405 GH |
1200 | outsz = info.base.argsz; |
1201 | if (outsz < minsz) | |
1202 | return -EINVAL; | |
1203 | if (outsz > sizeof(info)) | |
a5e6e650 GH |
1204 | return -EINVAL; |
1205 | ||
681c1615 | 1206 | ret = mbochs_get_region_info(mdev_state, &info); |
a5e6e650 GH |
1207 | if (ret) |
1208 | return ret; | |
1209 | ||
104c7405 | 1210 | if (copy_to_user((void __user *)arg, &info, outsz)) |
a5e6e650 GH |
1211 | return -EFAULT; |
1212 | ||
1213 | return 0; | |
1214 | } | |
1215 | ||
1216 | case VFIO_DEVICE_GET_IRQ_INFO: | |
1217 | { | |
1218 | struct vfio_irq_info info; | |
1219 | ||
1220 | minsz = offsetofend(struct vfio_irq_info, count); | |
1221 | ||
1222 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1223 | return -EFAULT; | |
1224 | ||
1225 | if ((info.argsz < minsz) || | |
104c7405 | 1226 | (info.index >= VFIO_PCI_NUM_IRQS)) |
a5e6e650 GH |
1227 | return -EINVAL; |
1228 | ||
681c1615 | 1229 | ret = mbochs_get_irq_info(&info); |
a5e6e650 GH |
1230 | if (ret) |
1231 | return ret; | |
1232 | ||
1233 | if (copy_to_user((void __user *)arg, &info, minsz)) | |
1234 | return -EFAULT; | |
1235 | ||
1236 | return 0; | |
1237 | } | |
1238 | ||
1239 | case VFIO_DEVICE_QUERY_GFX_PLANE: | |
1240 | { | |
1241 | struct vfio_device_gfx_plane_info plane; | |
1242 | ||
1243 | minsz = offsetofend(struct vfio_device_gfx_plane_info, | |
1244 | region_index); | |
1245 | ||
1246 | if (copy_from_user(&plane, (void __user *)arg, minsz)) | |
1247 | return -EFAULT; | |
1248 | ||
1249 | if (plane.argsz < minsz) | |
1250 | return -EINVAL; | |
1251 | ||
681c1615 | 1252 | ret = mbochs_query_gfx_plane(mdev_state, &plane); |
a5e6e650 GH |
1253 | if (ret) |
1254 | return ret; | |
1255 | ||
1256 | if (copy_to_user((void __user *)arg, &plane, minsz)) | |
1257 | return -EFAULT; | |
1258 | ||
1259 | return 0; | |
1260 | } | |
1261 | ||
1262 | case VFIO_DEVICE_GET_GFX_DMABUF: | |
1263 | { | |
1264 | u32 dmabuf_id; | |
1265 | ||
1266 | if (get_user(dmabuf_id, (__u32 __user *)arg)) | |
1267 | return -EFAULT; | |
1268 | ||
681c1615 | 1269 | return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id); |
a5e6e650 GH |
1270 | } |
1271 | ||
1272 | case VFIO_DEVICE_SET_IRQS: | |
1273 | return -EINVAL; | |
1274 | ||
1275 | case VFIO_DEVICE_RESET: | |
681c1615 | 1276 | return mbochs_reset(mdev_state); |
a5e6e650 GH |
1277 | } |
1278 | return -ENOTTY; | |
1279 | } | |
1280 | ||
3cb24827 | 1281 | static void mbochs_close_device(struct vfio_device *vdev) |
a5e6e650 | 1282 | { |
681c1615 JG |
1283 | struct mdev_state *mdev_state = |
1284 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 GH |
1285 | struct mbochs_dmabuf *dmabuf, *tmp; |
1286 | ||
1287 | mutex_lock(&mdev_state->ops_lock); | |
1288 | ||
1289 | list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) { | |
1290 | list_del(&dmabuf->next); | |
1291 | if (dmabuf->buf) { | |
1292 | /* free in mbochs_release_dmabuf() */ | |
1293 | dmabuf->unlinked = true; | |
1294 | } else { | |
1295 | kfree(dmabuf); | |
1296 | } | |
1297 | } | |
1298 | mbochs_put_pages(mdev_state); | |
1299 | ||
1300 | mutex_unlock(&mdev_state->ops_lock); | |
a5e6e650 GH |
1301 | } |
1302 | ||
1303 | static ssize_t | |
1304 | memory_show(struct device *dev, struct device_attribute *attr, | |
1305 | char *buf) | |
1306 | { | |
681c1615 | 1307 | struct mdev_state *mdev_state = dev_get_drvdata(dev); |
a5e6e650 GH |
1308 | |
1309 | return sprintf(buf, "%d MB\n", mdev_state->type->mbytes); | |
1310 | } | |
1311 | static DEVICE_ATTR_RO(memory); | |
1312 | ||
1313 | static struct attribute *mdev_dev_attrs[] = { | |
1314 | &dev_attr_memory.attr, | |
1315 | NULL, | |
1316 | }; | |
1317 | ||
1318 | static const struct attribute_group mdev_dev_group = { | |
1319 | .name = "vendor", | |
1320 | .attrs = mdev_dev_attrs, | |
1321 | }; | |
1322 | ||
6cbf507f | 1323 | static const struct attribute_group *mdev_dev_groups[] = { |
a5e6e650 GH |
1324 | &mdev_dev_group, |
1325 | NULL, | |
1326 | }; | |
1327 | ||
9169cff1 JG |
1328 | static ssize_t name_show(struct mdev_type *mtype, |
1329 | struct mdev_type_attribute *attr, char *buf) | |
a5e6e650 | 1330 | { |
9169cff1 JG |
1331 | const struct mbochs_type *type = |
1332 | &mbochs_types[mtype_get_type_group_id(mtype)]; | |
1333 | ||
1334 | return sprintf(buf, "%s\n", type->name); | |
a5e6e650 | 1335 | } |
6cbf507f | 1336 | static MDEV_TYPE_ATTR_RO(name); |
a5e6e650 | 1337 | |
9169cff1 JG |
1338 | static ssize_t description_show(struct mdev_type *mtype, |
1339 | struct mdev_type_attribute *attr, char *buf) | |
a5e6e650 | 1340 | { |
3d3a360e | 1341 | const struct mbochs_type *type = |
9169cff1 | 1342 | &mbochs_types[mtype_get_type_group_id(mtype)]; |
a5e6e650 GH |
1343 | |
1344 | return sprintf(buf, "virtual display, %d MB video memory\n", | |
1345 | type ? type->mbytes : 0); | |
1346 | } | |
6cbf507f | 1347 | static MDEV_TYPE_ATTR_RO(description); |
a5e6e650 | 1348 | |
9169cff1 JG |
1349 | static ssize_t available_instances_show(struct mdev_type *mtype, |
1350 | struct mdev_type_attribute *attr, | |
1351 | char *buf) | |
a5e6e650 | 1352 | { |
3d3a360e | 1353 | const struct mbochs_type *type = |
9169cff1 | 1354 | &mbochs_types[mtype_get_type_group_id(mtype)]; |
de5494af | 1355 | int count = atomic_read(&mbochs_avail_mbytes) / type->mbytes; |
a5e6e650 GH |
1356 | |
1357 | return sprintf(buf, "%d\n", count); | |
1358 | } | |
6cbf507f | 1359 | static MDEV_TYPE_ATTR_RO(available_instances); |
a5e6e650 | 1360 | |
9169cff1 JG |
1361 | static ssize_t device_api_show(struct mdev_type *mtype, |
1362 | struct mdev_type_attribute *attr, char *buf) | |
a5e6e650 GH |
1363 | { |
1364 | return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING); | |
1365 | } | |
6cbf507f | 1366 | static MDEV_TYPE_ATTR_RO(device_api); |
a5e6e650 GH |
1367 | |
1368 | static struct attribute *mdev_types_attrs[] = { | |
1369 | &mdev_type_attr_name.attr, | |
1370 | &mdev_type_attr_description.attr, | |
1371 | &mdev_type_attr_device_api.attr, | |
1372 | &mdev_type_attr_available_instances.attr, | |
1373 | NULL, | |
1374 | }; | |
1375 | ||
1376 | static struct attribute_group mdev_type_group1 = { | |
1377 | .name = MBOCHS_TYPE_1, | |
1378 | .attrs = mdev_types_attrs, | |
1379 | }; | |
1380 | ||
1381 | static struct attribute_group mdev_type_group2 = { | |
1382 | .name = MBOCHS_TYPE_2, | |
1383 | .attrs = mdev_types_attrs, | |
1384 | }; | |
1385 | ||
1386 | static struct attribute_group mdev_type_group3 = { | |
1387 | .name = MBOCHS_TYPE_3, | |
1388 | .attrs = mdev_types_attrs, | |
1389 | }; | |
1390 | ||
1391 | static struct attribute_group *mdev_type_groups[] = { | |
1392 | &mdev_type_group1, | |
1393 | &mdev_type_group2, | |
1394 | &mdev_type_group3, | |
1395 | NULL, | |
1396 | }; | |
1397 | ||
681c1615 | 1398 | static const struct vfio_device_ops mbochs_dev_ops = { |
3cb24827 | 1399 | .close_device = mbochs_close_device, |
681c1615 JG |
1400 | .read = mbochs_read, |
1401 | .write = mbochs_write, | |
1402 | .ioctl = mbochs_ioctl, | |
1403 | .mmap = mbochs_mmap, | |
1404 | }; | |
1405 | ||
1406 | static struct mdev_driver mbochs_driver = { | |
1407 | .driver = { | |
1408 | .name = "mbochs", | |
1409 | .owner = THIS_MODULE, | |
1410 | .mod_name = KBUILD_MODNAME, | |
1411 | .dev_groups = mdev_dev_groups, | |
1412 | }, | |
1413 | .probe = mbochs_probe, | |
1414 | .remove = mbochs_remove, | |
1415 | }; | |
1416 | ||
a5e6e650 GH |
1417 | static const struct mdev_parent_ops mdev_fops = { |
1418 | .owner = THIS_MODULE, | |
681c1615 | 1419 | .device_driver = &mbochs_driver, |
a5e6e650 | 1420 | .supported_type_groups = mdev_type_groups, |
a5e6e650 GH |
1421 | }; |
1422 | ||
1423 | static const struct file_operations vd_fops = { | |
1424 | .owner = THIS_MODULE, | |
1425 | }; | |
1426 | ||
1427 | static void mbochs_device_release(struct device *dev) | |
1428 | { | |
1429 | /* nothing */ | |
1430 | } | |
1431 | ||
1432 | static int __init mbochs_dev_init(void) | |
1433 | { | |
1434 | int ret = 0; | |
1435 | ||
de5494af JG |
1436 | atomic_set(&mbochs_avail_mbytes, max_mbytes); |
1437 | ||
16355214 | 1438 | ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME); |
a5e6e650 GH |
1439 | if (ret < 0) { |
1440 | pr_err("Error: failed to register mbochs_dev, err: %d\n", ret); | |
1441 | return ret; | |
1442 | } | |
1443 | cdev_init(&mbochs_cdev, &vd_fops); | |
16355214 | 1444 | cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1); |
a5e6e650 GH |
1445 | pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt)); |
1446 | ||
681c1615 JG |
1447 | ret = mdev_register_driver(&mbochs_driver); |
1448 | if (ret) | |
1449 | goto err_cdev; | |
1450 | ||
a5e6e650 GH |
1451 | mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME); |
1452 | if (IS_ERR(mbochs_class)) { | |
1453 | pr_err("Error: failed to register mbochs_dev class\n"); | |
1454 | ret = PTR_ERR(mbochs_class); | |
681c1615 | 1455 | goto err_driver; |
a5e6e650 GH |
1456 | } |
1457 | mbochs_dev.class = mbochs_class; | |
1458 | mbochs_dev.release = mbochs_device_release; | |
1459 | dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME); | |
1460 | ||
1461 | ret = device_register(&mbochs_dev); | |
1462 | if (ret) | |
681c1615 | 1463 | goto err_class; |
a5e6e650 GH |
1464 | |
1465 | ret = mdev_register_device(&mbochs_dev, &mdev_fops); | |
1466 | if (ret) | |
681c1615 | 1467 | goto err_device; |
a5e6e650 GH |
1468 | |
1469 | return 0; | |
1470 | ||
681c1615 | 1471 | err_device: |
a5e6e650 | 1472 | device_unregister(&mbochs_dev); |
681c1615 | 1473 | err_class: |
a5e6e650 | 1474 | class_destroy(mbochs_class); |
681c1615 JG |
1475 | err_driver: |
1476 | mdev_unregister_driver(&mbochs_driver); | |
1477 | err_cdev: | |
a5e6e650 | 1478 | cdev_del(&mbochs_cdev); |
16355214 | 1479 | unregister_chrdev_region(mbochs_devt, MINORMASK + 1); |
a5e6e650 GH |
1480 | return ret; |
1481 | } | |
1482 | ||
1483 | static void __exit mbochs_dev_exit(void) | |
1484 | { | |
1485 | mbochs_dev.bus = NULL; | |
1486 | mdev_unregister_device(&mbochs_dev); | |
1487 | ||
1488 | device_unregister(&mbochs_dev); | |
681c1615 | 1489 | mdev_unregister_driver(&mbochs_driver); |
a5e6e650 | 1490 | cdev_del(&mbochs_cdev); |
16355214 | 1491 | unregister_chrdev_region(mbochs_devt, MINORMASK + 1); |
a5e6e650 GH |
1492 | class_destroy(mbochs_class); |
1493 | mbochs_class = NULL; | |
1494 | } | |
1495 | ||
1496 | module_init(mbochs_dev_init) | |
1497 | module_exit(mbochs_dev_exit) |