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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; | |
132 | static int mbochs_used_mbytes; | |
133 | ||
104c7405 GH |
134 | struct vfio_region_info_ext { |
135 | struct vfio_region_info base; | |
136 | struct vfio_region_info_cap_type type; | |
137 | }; | |
138 | ||
a5e6e650 GH |
139 | struct mbochs_mode { |
140 | u32 drm_format; | |
141 | u32 bytepp; | |
142 | u32 width; | |
143 | u32 height; | |
144 | u32 stride; | |
145 | u32 __pad; | |
146 | u64 offset; | |
147 | u64 size; | |
148 | }; | |
149 | ||
150 | struct mbochs_dmabuf { | |
151 | struct mbochs_mode mode; | |
152 | u32 id; | |
153 | struct page **pages; | |
154 | pgoff_t pagecount; | |
155 | struct dma_buf *buf; | |
156 | struct mdev_state *mdev_state; | |
157 | struct list_head next; | |
158 | bool unlinked; | |
159 | }; | |
160 | ||
161 | /* State of each mdev device */ | |
162 | struct mdev_state { | |
163 | u8 *vconfig; | |
164 | u64 bar_mask[3]; | |
165 | u32 memory_bar_mask; | |
166 | struct mutex ops_lock; | |
167 | struct mdev_device *mdev; | |
a5e6e650 GH |
168 | |
169 | const struct mbochs_type *type; | |
170 | u16 vbe[VBE_DISPI_INDEX_COUNT]; | |
171 | u64 memsize; | |
172 | struct page **pages; | |
173 | pgoff_t pagecount; | |
104c7405 GH |
174 | struct vfio_region_gfx_edid edid_regs; |
175 | u8 edid_blob[0x400]; | |
a5e6e650 GH |
176 | |
177 | struct list_head dmabufs; | |
178 | u32 active_id; | |
179 | u32 next_id; | |
180 | }; | |
181 | ||
182 | static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = { | |
183 | [VBE_DISPI_INDEX_ID] = "id", | |
184 | [VBE_DISPI_INDEX_XRES] = "xres", | |
185 | [VBE_DISPI_INDEX_YRES] = "yres", | |
186 | [VBE_DISPI_INDEX_BPP] = "bpp", | |
187 | [VBE_DISPI_INDEX_ENABLE] = "enable", | |
188 | [VBE_DISPI_INDEX_BANK] = "bank", | |
189 | [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width", | |
190 | [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height", | |
191 | [VBE_DISPI_INDEX_X_OFFSET] = "x-offset", | |
192 | [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset", | |
193 | [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem", | |
194 | }; | |
195 | ||
196 | static const char *vbe_name(u32 index) | |
197 | { | |
198 | if (index < ARRAY_SIZE(vbe_name_list)) | |
199 | return vbe_name_list[index]; | |
200 | return "(invalid)"; | |
201 | } | |
202 | ||
498e8bf5 AK |
203 | static struct page *__mbochs_get_page(struct mdev_state *mdev_state, |
204 | pgoff_t pgoff); | |
a5e6e650 GH |
205 | static struct page *mbochs_get_page(struct mdev_state *mdev_state, |
206 | pgoff_t pgoff); | |
207 | ||
208 | static const struct mbochs_type *mbochs_find_type(struct kobject *kobj) | |
209 | { | |
210 | int i; | |
211 | ||
212 | for (i = 0; i < ARRAY_SIZE(mbochs_types); i++) | |
213 | if (strcmp(mbochs_types[i].name, kobj->name) == 0) | |
214 | return mbochs_types + i; | |
215 | return NULL; | |
216 | } | |
217 | ||
218 | static void mbochs_create_config_space(struct mdev_state *mdev_state) | |
219 | { | |
220 | STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID], | |
221 | 0x1234); | |
222 | STORE_LE16((u16 *) &mdev_state->vconfig[PCI_DEVICE_ID], | |
223 | 0x1111); | |
224 | STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_VENDOR_ID], | |
225 | PCI_SUBVENDOR_ID_REDHAT_QUMRANET); | |
226 | STORE_LE16((u16 *) &mdev_state->vconfig[PCI_SUBSYSTEM_ID], | |
227 | PCI_SUBDEVICE_ID_QEMU); | |
228 | ||
229 | STORE_LE16((u16 *) &mdev_state->vconfig[PCI_COMMAND], | |
230 | PCI_COMMAND_IO | PCI_COMMAND_MEMORY); | |
231 | STORE_LE16((u16 *) &mdev_state->vconfig[PCI_CLASS_DEVICE], | |
232 | PCI_CLASS_DISPLAY_OTHER); | |
233 | mdev_state->vconfig[PCI_CLASS_REVISION] = 0x01; | |
234 | ||
235 | STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_0], | |
236 | PCI_BASE_ADDRESS_SPACE_MEMORY | | |
237 | PCI_BASE_ADDRESS_MEM_TYPE_32 | | |
238 | PCI_BASE_ADDRESS_MEM_PREFETCH); | |
239 | mdev_state->bar_mask[0] = ~(mdev_state->memsize) + 1; | |
240 | ||
241 | STORE_LE32((u32 *) &mdev_state->vconfig[PCI_BASE_ADDRESS_2], | |
242 | PCI_BASE_ADDRESS_SPACE_MEMORY | | |
243 | PCI_BASE_ADDRESS_MEM_TYPE_32); | |
244 | mdev_state->bar_mask[2] = ~(MBOCHS_MMIO_BAR_SIZE) + 1; | |
245 | } | |
246 | ||
247 | static int mbochs_check_framebuffer(struct mdev_state *mdev_state, | |
248 | struct mbochs_mode *mode) | |
249 | { | |
250 | struct device *dev = mdev_dev(mdev_state->mdev); | |
251 | u16 *vbe = mdev_state->vbe; | |
252 | u32 virt_width; | |
253 | ||
254 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
255 | ||
256 | if (!(vbe[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) | |
257 | goto nofb; | |
258 | ||
259 | memset(mode, 0, sizeof(*mode)); | |
260 | switch (vbe[VBE_DISPI_INDEX_BPP]) { | |
261 | case 32: | |
262 | mode->drm_format = DRM_FORMAT_XRGB8888; | |
263 | mode->bytepp = 4; | |
264 | break; | |
265 | default: | |
266 | dev_info_ratelimited(dev, "%s: bpp %d not supported\n", | |
267 | __func__, vbe[VBE_DISPI_INDEX_BPP]); | |
268 | goto nofb; | |
269 | } | |
270 | ||
271 | mode->width = vbe[VBE_DISPI_INDEX_XRES]; | |
272 | mode->height = vbe[VBE_DISPI_INDEX_YRES]; | |
273 | virt_width = vbe[VBE_DISPI_INDEX_VIRT_WIDTH]; | |
274 | if (virt_width < mode->width) | |
275 | virt_width = mode->width; | |
276 | mode->stride = virt_width * mode->bytepp; | |
277 | mode->size = (u64)mode->stride * mode->height; | |
278 | mode->offset = ((u64)vbe[VBE_DISPI_INDEX_X_OFFSET] * mode->bytepp + | |
279 | (u64)vbe[VBE_DISPI_INDEX_Y_OFFSET] * mode->stride); | |
280 | ||
281 | if (mode->width < 64 || mode->height < 64) { | |
282 | dev_info_ratelimited(dev, "%s: invalid resolution %dx%d\n", | |
283 | __func__, mode->width, mode->height); | |
284 | goto nofb; | |
285 | } | |
286 | if (mode->offset + mode->size > mdev_state->memsize) { | |
287 | dev_info_ratelimited(dev, "%s: framebuffer memory overflow\n", | |
288 | __func__); | |
289 | goto nofb; | |
290 | } | |
291 | ||
292 | return 0; | |
293 | ||
294 | nofb: | |
295 | memset(mode, 0, sizeof(*mode)); | |
296 | return -EINVAL; | |
297 | } | |
298 | ||
299 | static bool mbochs_modes_equal(struct mbochs_mode *mode1, | |
300 | struct mbochs_mode *mode2) | |
301 | { | |
302 | return memcmp(mode1, mode2, sizeof(struct mbochs_mode)) == 0; | |
303 | } | |
304 | ||
305 | static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset, | |
306 | char *buf, u32 count) | |
307 | { | |
308 | struct device *dev = mdev_dev(mdev_state->mdev); | |
309 | int index = (offset - PCI_BASE_ADDRESS_0) / 0x04; | |
310 | u32 cfg_addr; | |
311 | ||
312 | switch (offset) { | |
313 | case PCI_BASE_ADDRESS_0: | |
314 | case PCI_BASE_ADDRESS_2: | |
315 | cfg_addr = *(u32 *)buf; | |
316 | ||
317 | if (cfg_addr == 0xffffffff) { | |
318 | cfg_addr = (cfg_addr & mdev_state->bar_mask[index]); | |
319 | } else { | |
320 | cfg_addr &= PCI_BASE_ADDRESS_MEM_MASK; | |
321 | if (cfg_addr) | |
322 | dev_info(dev, "BAR #%d @ 0x%x\n", | |
323 | index, cfg_addr); | |
324 | } | |
325 | ||
326 | cfg_addr |= (mdev_state->vconfig[offset] & | |
327 | ~PCI_BASE_ADDRESS_MEM_MASK); | |
328 | STORE_LE32(&mdev_state->vconfig[offset], cfg_addr); | |
329 | break; | |
330 | } | |
331 | } | |
332 | ||
333 | static void handle_mmio_write(struct mdev_state *mdev_state, u16 offset, | |
334 | char *buf, u32 count) | |
335 | { | |
336 | struct device *dev = mdev_dev(mdev_state->mdev); | |
337 | int index; | |
338 | u16 reg16; | |
339 | ||
340 | switch (offset) { | |
341 | case 0x400 ... 0x41f: /* vga ioports remapped */ | |
342 | goto unhandled; | |
343 | case 0x500 ... 0x515: /* bochs dispi interface */ | |
344 | if (count != 2) | |
345 | goto unhandled; | |
346 | index = (offset - 0x500) / 2; | |
347 | reg16 = *(u16 *)buf; | |
348 | if (index < ARRAY_SIZE(mdev_state->vbe)) | |
349 | mdev_state->vbe[index] = reg16; | |
350 | dev_dbg(dev, "%s: vbe write %d = %d (%s)\n", | |
351 | __func__, index, reg16, vbe_name(index)); | |
352 | break; | |
353 | case 0x600 ... 0x607: /* qemu extended regs */ | |
354 | goto unhandled; | |
355 | default: | |
356 | unhandled: | |
357 | dev_dbg(dev, "%s: @0x%03x, count %d (unhandled)\n", | |
358 | __func__, offset, count); | |
359 | break; | |
360 | } | |
361 | } | |
362 | ||
363 | static void handle_mmio_read(struct mdev_state *mdev_state, u16 offset, | |
364 | char *buf, u32 count) | |
365 | { | |
366 | struct device *dev = mdev_dev(mdev_state->mdev); | |
104c7405 | 367 | struct vfio_region_gfx_edid *edid; |
a5e6e650 GH |
368 | u16 reg16 = 0; |
369 | int index; | |
370 | ||
371 | switch (offset) { | |
104c7405 GH |
372 | case 0x000 ... 0x3ff: /* edid block */ |
373 | edid = &mdev_state->edid_regs; | |
374 | if (edid->link_state != VFIO_DEVICE_GFX_LINK_STATE_UP || | |
375 | offset >= edid->edid_size) { | |
376 | memset(buf, 0, count); | |
377 | break; | |
378 | } | |
379 | memcpy(buf, mdev_state->edid_blob + offset, count); | |
380 | break; | |
a5e6e650 GH |
381 | case 0x500 ... 0x515: /* bochs dispi interface */ |
382 | if (count != 2) | |
383 | goto unhandled; | |
384 | index = (offset - 0x500) / 2; | |
385 | if (index < ARRAY_SIZE(mdev_state->vbe)) | |
386 | reg16 = mdev_state->vbe[index]; | |
387 | dev_dbg(dev, "%s: vbe read %d = %d (%s)\n", | |
388 | __func__, index, reg16, vbe_name(index)); | |
389 | *(u16 *)buf = reg16; | |
390 | break; | |
391 | default: | |
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 | ||
104c7405 GH |
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 | ||
a5e6e650 GH |
438 | static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count, |
439 | loff_t pos, bool is_write) | |
440 | { | |
441 | struct mdev_state *mdev_state = mdev_get_drvdata(mdev); | |
442 | struct device *dev = mdev_dev(mdev); | |
443 | struct page *pg; | |
444 | loff_t poff; | |
445 | char *map; | |
446 | int ret = 0; | |
447 | ||
448 | mutex_lock(&mdev_state->ops_lock); | |
449 | ||
450 | if (pos < MBOCHS_CONFIG_SPACE_SIZE) { | |
451 | if (is_write) | |
452 | handle_pci_cfg_write(mdev_state, pos, buf, count); | |
453 | else | |
454 | memcpy(buf, (mdev_state->vconfig + pos), count); | |
455 | ||
456 | } else if (pos >= MBOCHS_MMIO_BAR_OFFSET && | |
104c7405 GH |
457 | pos + count <= (MBOCHS_MMIO_BAR_OFFSET + |
458 | MBOCHS_MMIO_BAR_SIZE)) { | |
a5e6e650 GH |
459 | pos -= MBOCHS_MMIO_BAR_OFFSET; |
460 | if (is_write) | |
461 | handle_mmio_write(mdev_state, pos, buf, count); | |
462 | else | |
463 | handle_mmio_read(mdev_state, pos, buf, count); | |
464 | ||
104c7405 GH |
465 | } else if (pos >= MBOCHS_EDID_OFFSET && |
466 | pos + count <= (MBOCHS_EDID_OFFSET + | |
467 | MBOCHS_EDID_SIZE)) { | |
468 | pos -= MBOCHS_EDID_OFFSET; | |
469 | if (pos < MBOCHS_EDID_BLOB_OFFSET) { | |
470 | handle_edid_regs(mdev_state, pos, buf, count, is_write); | |
471 | } else { | |
472 | pos -= MBOCHS_EDID_BLOB_OFFSET; | |
473 | handle_edid_blob(mdev_state, pos, buf, count, is_write); | |
474 | } | |
475 | ||
a5e6e650 GH |
476 | } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET && |
477 | pos + count <= | |
478 | MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) { | |
479 | pos -= MBOCHS_MMIO_BAR_OFFSET; | |
480 | poff = pos & ~PAGE_MASK; | |
498e8bf5 | 481 | pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT); |
a5e6e650 GH |
482 | map = kmap(pg); |
483 | if (is_write) | |
484 | memcpy(map + poff, buf, count); | |
485 | else | |
486 | memcpy(buf, map + poff, count); | |
487 | kunmap(pg); | |
488 | put_page(pg); | |
489 | ||
490 | } else { | |
491 | dev_dbg(dev, "%s: %s @0x%llx (unhandled)\n", | |
492 | __func__, is_write ? "WR" : "RD", pos); | |
493 | ret = -1; | |
494 | goto accessfailed; | |
495 | } | |
496 | ||
497 | ret = count; | |
498 | ||
499 | ||
500 | accessfailed: | |
501 | mutex_unlock(&mdev_state->ops_lock); | |
502 | ||
503 | return ret; | |
504 | } | |
505 | ||
506 | static int mbochs_reset(struct mdev_device *mdev) | |
507 | { | |
508 | struct mdev_state *mdev_state = mdev_get_drvdata(mdev); | |
509 | u32 size64k = mdev_state->memsize / (64 * 1024); | |
510 | int i; | |
511 | ||
512 | for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++) | |
513 | mdev_state->vbe[i] = 0; | |
514 | mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5; | |
515 | mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k; | |
516 | return 0; | |
517 | } | |
518 | ||
519 | static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev) | |
520 | { | |
521 | const struct mbochs_type *type = mbochs_find_type(kobj); | |
522 | struct device *dev = mdev_dev(mdev); | |
523 | struct mdev_state *mdev_state; | |
524 | ||
525 | if (!type) | |
526 | type = &mbochs_types[0]; | |
527 | if (type->mbytes + mbochs_used_mbytes > max_mbytes) | |
528 | return -ENOMEM; | |
529 | ||
530 | mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL); | |
531 | if (mdev_state == NULL) | |
532 | return -ENOMEM; | |
533 | ||
534 | mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL); | |
535 | if (mdev_state->vconfig == NULL) | |
536 | goto err_mem; | |
537 | ||
538 | mdev_state->memsize = type->mbytes * 1024 * 1024; | |
539 | mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT; | |
540 | mdev_state->pages = kcalloc(mdev_state->pagecount, | |
541 | sizeof(struct page *), | |
542 | GFP_KERNEL); | |
543 | if (!mdev_state->pages) | |
544 | goto err_mem; | |
545 | ||
546 | dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__, | |
547 | kobj->name, type->mbytes, mdev_state->pagecount); | |
548 | ||
549 | mutex_init(&mdev_state->ops_lock); | |
550 | mdev_state->mdev = mdev; | |
551 | mdev_set_drvdata(mdev, mdev_state); | |
552 | INIT_LIST_HEAD(&mdev_state->dmabufs); | |
553 | mdev_state->next_id = 1; | |
554 | ||
555 | mdev_state->type = type; | |
104c7405 GH |
556 | mdev_state->edid_regs.max_xres = type->max_x; |
557 | mdev_state->edid_regs.max_yres = type->max_y; | |
558 | mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET; | |
559 | mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob); | |
a5e6e650 GH |
560 | mbochs_create_config_space(mdev_state); |
561 | mbochs_reset(mdev); | |
562 | ||
563 | mbochs_used_mbytes += type->mbytes; | |
564 | return 0; | |
565 | ||
566 | err_mem: | |
567 | kfree(mdev_state->vconfig); | |
568 | kfree(mdev_state); | |
569 | return -ENOMEM; | |
570 | } | |
571 | ||
572 | static int mbochs_remove(struct mdev_device *mdev) | |
573 | { | |
574 | struct mdev_state *mdev_state = mdev_get_drvdata(mdev); | |
575 | ||
576 | mbochs_used_mbytes -= mdev_state->type->mbytes; | |
577 | mdev_set_drvdata(mdev, NULL); | |
578 | kfree(mdev_state->pages); | |
579 | kfree(mdev_state->vconfig); | |
580 | kfree(mdev_state); | |
581 | return 0; | |
582 | } | |
583 | ||
584 | static ssize_t mbochs_read(struct mdev_device *mdev, char __user *buf, | |
585 | size_t count, loff_t *ppos) | |
586 | { | |
587 | unsigned int done = 0; | |
588 | int ret; | |
589 | ||
590 | while (count) { | |
591 | size_t filled; | |
592 | ||
593 | if (count >= 4 && !(*ppos % 4)) { | |
594 | u32 val; | |
595 | ||
596 | ret = mdev_access(mdev, (char *)&val, sizeof(val), | |
597 | *ppos, false); | |
598 | if (ret <= 0) | |
599 | goto read_err; | |
600 | ||
601 | if (copy_to_user(buf, &val, sizeof(val))) | |
602 | goto read_err; | |
603 | ||
604 | filled = 4; | |
605 | } else if (count >= 2 && !(*ppos % 2)) { | |
606 | u16 val; | |
607 | ||
608 | ret = mdev_access(mdev, (char *)&val, sizeof(val), | |
609 | *ppos, false); | |
610 | if (ret <= 0) | |
611 | goto read_err; | |
612 | ||
613 | if (copy_to_user(buf, &val, sizeof(val))) | |
614 | goto read_err; | |
615 | ||
616 | filled = 2; | |
617 | } else { | |
618 | u8 val; | |
619 | ||
620 | ret = mdev_access(mdev, (char *)&val, sizeof(val), | |
621 | *ppos, false); | |
622 | if (ret <= 0) | |
623 | goto read_err; | |
624 | ||
625 | if (copy_to_user(buf, &val, sizeof(val))) | |
626 | goto read_err; | |
627 | ||
628 | filled = 1; | |
629 | } | |
630 | ||
631 | count -= filled; | |
632 | done += filled; | |
633 | *ppos += filled; | |
634 | buf += filled; | |
635 | } | |
636 | ||
637 | return done; | |
638 | ||
639 | read_err: | |
640 | return -EFAULT; | |
641 | } | |
642 | ||
643 | static ssize_t mbochs_write(struct mdev_device *mdev, const char __user *buf, | |
644 | size_t count, loff_t *ppos) | |
645 | { | |
646 | unsigned int done = 0; | |
647 | int ret; | |
648 | ||
649 | while (count) { | |
650 | size_t filled; | |
651 | ||
652 | if (count >= 4 && !(*ppos % 4)) { | |
653 | u32 val; | |
654 | ||
655 | if (copy_from_user(&val, buf, sizeof(val))) | |
656 | goto write_err; | |
657 | ||
658 | ret = mdev_access(mdev, (char *)&val, sizeof(val), | |
659 | *ppos, true); | |
660 | if (ret <= 0) | |
661 | goto write_err; | |
662 | ||
663 | filled = 4; | |
664 | } else if (count >= 2 && !(*ppos % 2)) { | |
665 | u16 val; | |
666 | ||
667 | if (copy_from_user(&val, buf, sizeof(val))) | |
668 | goto write_err; | |
669 | ||
670 | ret = mdev_access(mdev, (char *)&val, sizeof(val), | |
671 | *ppos, true); | |
672 | if (ret <= 0) | |
673 | goto write_err; | |
674 | ||
675 | filled = 2; | |
676 | } else { | |
677 | u8 val; | |
678 | ||
679 | if (copy_from_user(&val, buf, sizeof(val))) | |
680 | goto write_err; | |
681 | ||
682 | ret = mdev_access(mdev, (char *)&val, sizeof(val), | |
683 | *ppos, true); | |
684 | if (ret <= 0) | |
685 | goto write_err; | |
686 | ||
687 | filled = 1; | |
688 | } | |
689 | count -= filled; | |
690 | done += filled; | |
691 | *ppos += filled; | |
692 | buf += filled; | |
693 | } | |
694 | ||
695 | return done; | |
696 | write_err: | |
697 | return -EFAULT; | |
698 | } | |
699 | ||
700 | static struct page *__mbochs_get_page(struct mdev_state *mdev_state, | |
701 | pgoff_t pgoff) | |
702 | { | |
703 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
704 | ||
705 | if (!mdev_state->pages[pgoff]) { | |
706 | mdev_state->pages[pgoff] = | |
707 | alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0); | |
708 | if (!mdev_state->pages[pgoff]) | |
709 | return NULL; | |
710 | } | |
711 | ||
712 | get_page(mdev_state->pages[pgoff]); | |
713 | return mdev_state->pages[pgoff]; | |
714 | } | |
715 | ||
716 | static struct page *mbochs_get_page(struct mdev_state *mdev_state, | |
717 | pgoff_t pgoff) | |
718 | { | |
719 | struct page *page; | |
720 | ||
721 | if (WARN_ON(pgoff >= mdev_state->pagecount)) | |
722 | return NULL; | |
723 | ||
724 | mutex_lock(&mdev_state->ops_lock); | |
725 | page = __mbochs_get_page(mdev_state, pgoff); | |
726 | mutex_unlock(&mdev_state->ops_lock); | |
727 | ||
728 | return page; | |
729 | } | |
730 | ||
731 | static void mbochs_put_pages(struct mdev_state *mdev_state) | |
732 | { | |
733 | struct device *dev = mdev_dev(mdev_state->mdev); | |
734 | int i, count = 0; | |
735 | ||
736 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
737 | ||
738 | for (i = 0; i < mdev_state->pagecount; i++) { | |
739 | if (!mdev_state->pages[i]) | |
740 | continue; | |
741 | put_page(mdev_state->pages[i]); | |
742 | mdev_state->pages[i] = NULL; | |
743 | count++; | |
744 | } | |
745 | dev_dbg(dev, "%s: %d pages released\n", __func__, count); | |
746 | } | |
747 | ||
d7ef4899 | 748 | static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf) |
a5e6e650 GH |
749 | { |
750 | struct vm_area_struct *vma = vmf->vma; | |
751 | struct mdev_state *mdev_state = vma->vm_private_data; | |
752 | pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; | |
753 | ||
754 | if (page_offset >= mdev_state->pagecount) | |
755 | return VM_FAULT_SIGBUS; | |
756 | ||
757 | vmf->page = mbochs_get_page(mdev_state, page_offset); | |
758 | if (!vmf->page) | |
759 | return VM_FAULT_SIGBUS; | |
760 | ||
761 | return 0; | |
762 | } | |
763 | ||
764 | static const struct vm_operations_struct mbochs_region_vm_ops = { | |
765 | .fault = mbochs_region_vm_fault, | |
766 | }; | |
767 | ||
768 | static int mbochs_mmap(struct mdev_device *mdev, struct vm_area_struct *vma) | |
769 | { | |
770 | struct mdev_state *mdev_state = mdev_get_drvdata(mdev); | |
771 | ||
772 | if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT) | |
773 | return -EINVAL; | |
774 | if (vma->vm_end < vma->vm_start) | |
775 | return -EINVAL; | |
776 | if (vma->vm_end - vma->vm_start > mdev_state->memsize) | |
777 | return -EINVAL; | |
778 | if ((vma->vm_flags & VM_SHARED) == 0) | |
779 | return -EINVAL; | |
780 | ||
781 | vma->vm_ops = &mbochs_region_vm_ops; | |
782 | vma->vm_private_data = mdev_state; | |
783 | return 0; | |
784 | } | |
785 | ||
d7ef4899 | 786 | static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf) |
a5e6e650 GH |
787 | { |
788 | struct vm_area_struct *vma = vmf->vma; | |
789 | struct mbochs_dmabuf *dmabuf = vma->vm_private_data; | |
790 | ||
791 | if (WARN_ON(vmf->pgoff >= dmabuf->pagecount)) | |
792 | return VM_FAULT_SIGBUS; | |
793 | ||
794 | vmf->page = dmabuf->pages[vmf->pgoff]; | |
795 | get_page(vmf->page); | |
796 | return 0; | |
797 | } | |
798 | ||
799 | static const struct vm_operations_struct mbochs_dmabuf_vm_ops = { | |
800 | .fault = mbochs_dmabuf_vm_fault, | |
801 | }; | |
802 | ||
803 | static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma) | |
804 | { | |
805 | struct mbochs_dmabuf *dmabuf = buf->priv; | |
806 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
807 | ||
808 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
809 | ||
810 | if ((vma->vm_flags & VM_SHARED) == 0) | |
811 | return -EINVAL; | |
812 | ||
813 | vma->vm_ops = &mbochs_dmabuf_vm_ops; | |
814 | vma->vm_private_data = dmabuf; | |
815 | return 0; | |
816 | } | |
817 | ||
818 | static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf, | |
819 | const char *prefix) | |
820 | { | |
821 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
822 | u32 fourcc = dmabuf->mode.drm_format; | |
823 | ||
824 | dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n", | |
825 | prefix, dmabuf->id, | |
826 | fourcc ? ((fourcc >> 0) & 0xff) : '-', | |
827 | fourcc ? ((fourcc >> 8) & 0xff) : '-', | |
828 | fourcc ? ((fourcc >> 16) & 0xff) : '-', | |
829 | fourcc ? ((fourcc >> 24) & 0xff) : '-', | |
830 | dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride, | |
831 | dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount); | |
832 | } | |
833 | ||
834 | static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at, | |
835 | enum dma_data_direction direction) | |
836 | { | |
837 | struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; | |
838 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
839 | struct sg_table *sg; | |
840 | ||
841 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
842 | ||
843 | sg = kzalloc(sizeof(*sg), GFP_KERNEL); | |
844 | if (!sg) | |
845 | goto err1; | |
846 | if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount, | |
847 | 0, dmabuf->mode.size, GFP_KERNEL) < 0) | |
848 | goto err2; | |
849 | if (!dma_map_sg(at->dev, sg->sgl, sg->nents, direction)) | |
850 | goto err3; | |
851 | ||
852 | return sg; | |
853 | ||
854 | err3: | |
855 | sg_free_table(sg); | |
856 | err2: | |
857 | kfree(sg); | |
858 | err1: | |
859 | return ERR_PTR(-ENOMEM); | |
860 | } | |
861 | ||
862 | static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at, | |
863 | struct sg_table *sg, | |
864 | enum dma_data_direction direction) | |
865 | { | |
866 | struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; | |
867 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
868 | ||
869 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
870 | ||
871 | sg_free_table(sg); | |
872 | kfree(sg); | |
873 | } | |
874 | ||
875 | static void mbochs_release_dmabuf(struct dma_buf *buf) | |
876 | { | |
877 | struct mbochs_dmabuf *dmabuf = buf->priv; | |
878 | struct mdev_state *mdev_state = dmabuf->mdev_state; | |
879 | struct device *dev = mdev_dev(mdev_state->mdev); | |
880 | pgoff_t pg; | |
881 | ||
882 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
883 | ||
884 | for (pg = 0; pg < dmabuf->pagecount; pg++) | |
885 | put_page(dmabuf->pages[pg]); | |
886 | ||
887 | mutex_lock(&mdev_state->ops_lock); | |
888 | dmabuf->buf = NULL; | |
889 | if (dmabuf->unlinked) | |
890 | kfree(dmabuf); | |
891 | mutex_unlock(&mdev_state->ops_lock); | |
892 | } | |
893 | ||
a5e6e650 GH |
894 | static struct dma_buf_ops mbochs_dmabuf_ops = { |
895 | .map_dma_buf = mbochs_map_dmabuf, | |
896 | .unmap_dma_buf = mbochs_unmap_dmabuf, | |
897 | .release = mbochs_release_dmabuf, | |
a5e6e650 GH |
898 | .mmap = mbochs_mmap_dmabuf, |
899 | }; | |
900 | ||
901 | static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state, | |
902 | struct mbochs_mode *mode) | |
903 | { | |
904 | struct mbochs_dmabuf *dmabuf; | |
905 | pgoff_t page_offset, pg; | |
906 | ||
907 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
908 | ||
909 | dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL); | |
910 | if (!dmabuf) | |
911 | return NULL; | |
912 | ||
913 | dmabuf->mode = *mode; | |
914 | dmabuf->id = mdev_state->next_id++; | |
915 | dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE); | |
916 | dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *), | |
917 | GFP_KERNEL); | |
918 | if (!dmabuf->pages) | |
919 | goto err_free_dmabuf; | |
920 | ||
921 | page_offset = dmabuf->mode.offset >> PAGE_SHIFT; | |
922 | for (pg = 0; pg < dmabuf->pagecount; pg++) { | |
923 | dmabuf->pages[pg] = __mbochs_get_page(mdev_state, | |
924 | page_offset + pg); | |
925 | if (!dmabuf->pages[pg]) | |
926 | goto err_free_pages; | |
927 | } | |
928 | ||
929 | dmabuf->mdev_state = mdev_state; | |
930 | list_add(&dmabuf->next, &mdev_state->dmabufs); | |
931 | ||
932 | mbochs_print_dmabuf(dmabuf, __func__); | |
933 | return dmabuf; | |
934 | ||
935 | err_free_pages: | |
936 | while (pg > 0) | |
937 | put_page(dmabuf->pages[--pg]); | |
938 | kfree(dmabuf->pages); | |
939 | err_free_dmabuf: | |
940 | kfree(dmabuf); | |
941 | return NULL; | |
942 | } | |
943 | ||
944 | static struct mbochs_dmabuf * | |
945 | mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state, | |
946 | struct mbochs_mode *mode) | |
947 | { | |
948 | struct mbochs_dmabuf *dmabuf; | |
949 | ||
950 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
951 | ||
952 | list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) | |
953 | if (mbochs_modes_equal(&dmabuf->mode, mode)) | |
954 | return dmabuf; | |
955 | ||
956 | return NULL; | |
957 | } | |
958 | ||
959 | static struct mbochs_dmabuf * | |
960 | mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id) | |
961 | { | |
962 | struct mbochs_dmabuf *dmabuf; | |
963 | ||
964 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
965 | ||
966 | list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) | |
967 | if (dmabuf->id == id) | |
968 | return dmabuf; | |
969 | ||
970 | return NULL; | |
971 | } | |
972 | ||
973 | static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf) | |
974 | { | |
975 | struct mdev_state *mdev_state = dmabuf->mdev_state; | |
976 | struct device *dev = mdev_dev(mdev_state->mdev); | |
977 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); | |
978 | struct dma_buf *buf; | |
979 | ||
980 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
981 | ||
982 | if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) { | |
983 | dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n", | |
984 | __func__); | |
985 | return -EINVAL; | |
986 | } | |
987 | ||
988 | exp_info.ops = &mbochs_dmabuf_ops; | |
989 | exp_info.size = dmabuf->mode.size; | |
990 | exp_info.priv = dmabuf; | |
991 | ||
992 | buf = dma_buf_export(&exp_info); | |
993 | if (IS_ERR(buf)) { | |
994 | dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n", | |
995 | __func__, PTR_ERR(buf)); | |
996 | return PTR_ERR(buf); | |
997 | } | |
998 | ||
999 | dmabuf->buf = buf; | |
1000 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | static int mbochs_get_region_info(struct mdev_device *mdev, | |
104c7405 | 1005 | struct vfio_region_info_ext *ext) |
a5e6e650 | 1006 | { |
104c7405 | 1007 | struct vfio_region_info *region_info = &ext->base; |
a5e6e650 GH |
1008 | struct mdev_state *mdev_state; |
1009 | ||
1010 | mdev_state = mdev_get_drvdata(mdev); | |
1011 | if (!mdev_state) | |
1012 | return -EINVAL; | |
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 | ||
1060 | static int mbochs_get_irq_info(struct mdev_device *mdev, | |
1061 | struct vfio_irq_info *irq_info) | |
1062 | { | |
1063 | irq_info->count = 0; | |
1064 | return 0; | |
1065 | } | |
1066 | ||
1067 | static int mbochs_get_device_info(struct mdev_device *mdev, | |
1068 | struct vfio_device_info *dev_info) | |
1069 | { | |
1070 | dev_info->flags = VFIO_DEVICE_FLAGS_PCI; | |
104c7405 | 1071 | dev_info->num_regions = MBOCHS_NUM_REGIONS; |
a5e6e650 GH |
1072 | dev_info->num_irqs = VFIO_PCI_NUM_IRQS; |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | static int mbochs_query_gfx_plane(struct mdev_device *mdev, | |
1077 | struct vfio_device_gfx_plane_info *plane) | |
1078 | { | |
1079 | struct mdev_state *mdev_state = mdev_get_drvdata(mdev); | |
1080 | struct device *dev = mdev_dev(mdev); | |
1081 | struct mbochs_dmabuf *dmabuf; | |
1082 | struct mbochs_mode mode; | |
1083 | int ret; | |
1084 | ||
1085 | if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) { | |
1086 | if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE | | |
1087 | VFIO_GFX_PLANE_TYPE_DMABUF)) | |
1088 | return 0; | |
1089 | return -EINVAL; | |
1090 | } | |
1091 | ||
1092 | if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF) | |
1093 | return -EINVAL; | |
1094 | ||
1095 | plane->drm_format_mod = 0; | |
1096 | plane->x_pos = 0; | |
1097 | plane->y_pos = 0; | |
1098 | plane->x_hot = 0; | |
1099 | plane->y_hot = 0; | |
1100 | ||
1101 | mutex_lock(&mdev_state->ops_lock); | |
1102 | ||
1103 | ret = -EINVAL; | |
1104 | if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY) | |
1105 | ret = mbochs_check_framebuffer(mdev_state, &mode); | |
1106 | if (ret < 0) { | |
1107 | plane->drm_format = 0; | |
1108 | plane->width = 0; | |
1109 | plane->height = 0; | |
1110 | plane->stride = 0; | |
1111 | plane->size = 0; | |
1112 | plane->dmabuf_id = 0; | |
1113 | goto done; | |
1114 | } | |
1115 | ||
1116 | dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode); | |
1117 | if (!dmabuf) | |
1118 | mbochs_dmabuf_alloc(mdev_state, &mode); | |
1119 | if (!dmabuf) { | |
1120 | mutex_unlock(&mdev_state->ops_lock); | |
1121 | return -ENOMEM; | |
1122 | } | |
1123 | ||
1124 | plane->drm_format = dmabuf->mode.drm_format; | |
1125 | plane->width = dmabuf->mode.width; | |
1126 | plane->height = dmabuf->mode.height; | |
1127 | plane->stride = dmabuf->mode.stride; | |
1128 | plane->size = dmabuf->mode.size; | |
1129 | plane->dmabuf_id = dmabuf->id; | |
1130 | ||
1131 | done: | |
1132 | if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY && | |
1133 | mdev_state->active_id != plane->dmabuf_id) { | |
1134 | dev_dbg(dev, "%s: primary: %d => %d\n", __func__, | |
1135 | mdev_state->active_id, plane->dmabuf_id); | |
1136 | mdev_state->active_id = plane->dmabuf_id; | |
1137 | } | |
1138 | mutex_unlock(&mdev_state->ops_lock); | |
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | static int mbochs_get_gfx_dmabuf(struct mdev_device *mdev, | |
1143 | u32 id) | |
1144 | { | |
1145 | struct mdev_state *mdev_state = mdev_get_drvdata(mdev); | |
1146 | struct mbochs_dmabuf *dmabuf; | |
1147 | ||
1148 | mutex_lock(&mdev_state->ops_lock); | |
1149 | ||
1150 | dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id); | |
1151 | if (!dmabuf) { | |
1152 | mutex_unlock(&mdev_state->ops_lock); | |
1153 | return -ENOENT; | |
1154 | } | |
1155 | ||
1156 | if (!dmabuf->buf) | |
1157 | mbochs_dmabuf_export(dmabuf); | |
1158 | ||
1159 | mutex_unlock(&mdev_state->ops_lock); | |
1160 | ||
1161 | if (!dmabuf->buf) | |
1162 | return -EINVAL; | |
1163 | ||
1164 | return dma_buf_fd(dmabuf->buf, 0); | |
1165 | } | |
1166 | ||
1167 | static long mbochs_ioctl(struct mdev_device *mdev, unsigned int cmd, | |
1168 | unsigned long arg) | |
1169 | { | |
1170 | int ret = 0; | |
104c7405 | 1171 | unsigned long minsz, outsz; |
a5e6e650 GH |
1172 | |
1173 | switch (cmd) { | |
1174 | case VFIO_DEVICE_GET_INFO: | |
1175 | { | |
1176 | struct vfio_device_info info; | |
1177 | ||
1178 | minsz = offsetofend(struct vfio_device_info, num_irqs); | |
1179 | ||
1180 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1181 | return -EFAULT; | |
1182 | ||
1183 | if (info.argsz < minsz) | |
1184 | return -EINVAL; | |
1185 | ||
1186 | ret = mbochs_get_device_info(mdev, &info); | |
1187 | if (ret) | |
1188 | return ret; | |
1189 | ||
a5e6e650 GH |
1190 | if (copy_to_user((void __user *)arg, &info, minsz)) |
1191 | return -EFAULT; | |
1192 | ||
1193 | return 0; | |
1194 | } | |
1195 | case VFIO_DEVICE_GET_REGION_INFO: | |
1196 | { | |
104c7405 | 1197 | struct vfio_region_info_ext info; |
a5e6e650 | 1198 | |
104c7405 | 1199 | minsz = offsetofend(typeof(info), base.offset); |
a5e6e650 GH |
1200 | |
1201 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1202 | return -EFAULT; | |
1203 | ||
104c7405 GH |
1204 | outsz = info.base.argsz; |
1205 | if (outsz < minsz) | |
1206 | return -EINVAL; | |
1207 | if (outsz > sizeof(info)) | |
a5e6e650 GH |
1208 | return -EINVAL; |
1209 | ||
104c7405 | 1210 | ret = mbochs_get_region_info(mdev, &info); |
a5e6e650 GH |
1211 | if (ret) |
1212 | return ret; | |
1213 | ||
104c7405 | 1214 | if (copy_to_user((void __user *)arg, &info, outsz)) |
a5e6e650 GH |
1215 | return -EFAULT; |
1216 | ||
1217 | return 0; | |
1218 | } | |
1219 | ||
1220 | case VFIO_DEVICE_GET_IRQ_INFO: | |
1221 | { | |
1222 | struct vfio_irq_info info; | |
1223 | ||
1224 | minsz = offsetofend(struct vfio_irq_info, count); | |
1225 | ||
1226 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1227 | return -EFAULT; | |
1228 | ||
1229 | if ((info.argsz < minsz) || | |
104c7405 | 1230 | (info.index >= VFIO_PCI_NUM_IRQS)) |
a5e6e650 GH |
1231 | return -EINVAL; |
1232 | ||
1233 | ret = mbochs_get_irq_info(mdev, &info); | |
1234 | if (ret) | |
1235 | return ret; | |
1236 | ||
1237 | if (copy_to_user((void __user *)arg, &info, minsz)) | |
1238 | return -EFAULT; | |
1239 | ||
1240 | return 0; | |
1241 | } | |
1242 | ||
1243 | case VFIO_DEVICE_QUERY_GFX_PLANE: | |
1244 | { | |
1245 | struct vfio_device_gfx_plane_info plane; | |
1246 | ||
1247 | minsz = offsetofend(struct vfio_device_gfx_plane_info, | |
1248 | region_index); | |
1249 | ||
1250 | if (copy_from_user(&plane, (void __user *)arg, minsz)) | |
1251 | return -EFAULT; | |
1252 | ||
1253 | if (plane.argsz < minsz) | |
1254 | return -EINVAL; | |
1255 | ||
1256 | ret = mbochs_query_gfx_plane(mdev, &plane); | |
1257 | if (ret) | |
1258 | return ret; | |
1259 | ||
1260 | if (copy_to_user((void __user *)arg, &plane, minsz)) | |
1261 | return -EFAULT; | |
1262 | ||
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | case VFIO_DEVICE_GET_GFX_DMABUF: | |
1267 | { | |
1268 | u32 dmabuf_id; | |
1269 | ||
1270 | if (get_user(dmabuf_id, (__u32 __user *)arg)) | |
1271 | return -EFAULT; | |
1272 | ||
1273 | return mbochs_get_gfx_dmabuf(mdev, dmabuf_id); | |
1274 | } | |
1275 | ||
1276 | case VFIO_DEVICE_SET_IRQS: | |
1277 | return -EINVAL; | |
1278 | ||
1279 | case VFIO_DEVICE_RESET: | |
1280 | return mbochs_reset(mdev); | |
1281 | } | |
1282 | return -ENOTTY; | |
1283 | } | |
1284 | ||
1285 | static int mbochs_open(struct mdev_device *mdev) | |
1286 | { | |
1287 | if (!try_module_get(THIS_MODULE)) | |
1288 | return -ENODEV; | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | static void mbochs_close(struct mdev_device *mdev) | |
1294 | { | |
1295 | struct mdev_state *mdev_state = mdev_get_drvdata(mdev); | |
1296 | struct mbochs_dmabuf *dmabuf, *tmp; | |
1297 | ||
1298 | mutex_lock(&mdev_state->ops_lock); | |
1299 | ||
1300 | list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) { | |
1301 | list_del(&dmabuf->next); | |
1302 | if (dmabuf->buf) { | |
1303 | /* free in mbochs_release_dmabuf() */ | |
1304 | dmabuf->unlinked = true; | |
1305 | } else { | |
1306 | kfree(dmabuf); | |
1307 | } | |
1308 | } | |
1309 | mbochs_put_pages(mdev_state); | |
1310 | ||
1311 | mutex_unlock(&mdev_state->ops_lock); | |
1312 | module_put(THIS_MODULE); | |
1313 | } | |
1314 | ||
1315 | static ssize_t | |
1316 | memory_show(struct device *dev, struct device_attribute *attr, | |
1317 | char *buf) | |
1318 | { | |
1319 | struct mdev_device *mdev = mdev_from_dev(dev); | |
1320 | struct mdev_state *mdev_state = mdev_get_drvdata(mdev); | |
1321 | ||
1322 | return sprintf(buf, "%d MB\n", mdev_state->type->mbytes); | |
1323 | } | |
1324 | static DEVICE_ATTR_RO(memory); | |
1325 | ||
1326 | static struct attribute *mdev_dev_attrs[] = { | |
1327 | &dev_attr_memory.attr, | |
1328 | NULL, | |
1329 | }; | |
1330 | ||
1331 | static const struct attribute_group mdev_dev_group = { | |
1332 | .name = "vendor", | |
1333 | .attrs = mdev_dev_attrs, | |
1334 | }; | |
1335 | ||
1336 | const struct attribute_group *mdev_dev_groups[] = { | |
1337 | &mdev_dev_group, | |
1338 | NULL, | |
1339 | }; | |
1340 | ||
1341 | static ssize_t | |
1342 | name_show(struct kobject *kobj, struct device *dev, char *buf) | |
1343 | { | |
1344 | return sprintf(buf, "%s\n", kobj->name); | |
1345 | } | |
1346 | MDEV_TYPE_ATTR_RO(name); | |
1347 | ||
1348 | static ssize_t | |
1349 | description_show(struct kobject *kobj, struct device *dev, char *buf) | |
1350 | { | |
1351 | const struct mbochs_type *type = mbochs_find_type(kobj); | |
1352 | ||
1353 | return sprintf(buf, "virtual display, %d MB video memory\n", | |
1354 | type ? type->mbytes : 0); | |
1355 | } | |
1356 | MDEV_TYPE_ATTR_RO(description); | |
1357 | ||
1358 | static ssize_t | |
1359 | available_instances_show(struct kobject *kobj, struct device *dev, char *buf) | |
1360 | { | |
1361 | const struct mbochs_type *type = mbochs_find_type(kobj); | |
1362 | int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes; | |
1363 | ||
1364 | return sprintf(buf, "%d\n", count); | |
1365 | } | |
1366 | MDEV_TYPE_ATTR_RO(available_instances); | |
1367 | ||
1368 | static ssize_t device_api_show(struct kobject *kobj, struct device *dev, | |
1369 | char *buf) | |
1370 | { | |
1371 | return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING); | |
1372 | } | |
1373 | MDEV_TYPE_ATTR_RO(device_api); | |
1374 | ||
1375 | static struct attribute *mdev_types_attrs[] = { | |
1376 | &mdev_type_attr_name.attr, | |
1377 | &mdev_type_attr_description.attr, | |
1378 | &mdev_type_attr_device_api.attr, | |
1379 | &mdev_type_attr_available_instances.attr, | |
1380 | NULL, | |
1381 | }; | |
1382 | ||
1383 | static struct attribute_group mdev_type_group1 = { | |
1384 | .name = MBOCHS_TYPE_1, | |
1385 | .attrs = mdev_types_attrs, | |
1386 | }; | |
1387 | ||
1388 | static struct attribute_group mdev_type_group2 = { | |
1389 | .name = MBOCHS_TYPE_2, | |
1390 | .attrs = mdev_types_attrs, | |
1391 | }; | |
1392 | ||
1393 | static struct attribute_group mdev_type_group3 = { | |
1394 | .name = MBOCHS_TYPE_3, | |
1395 | .attrs = mdev_types_attrs, | |
1396 | }; | |
1397 | ||
1398 | static struct attribute_group *mdev_type_groups[] = { | |
1399 | &mdev_type_group1, | |
1400 | &mdev_type_group2, | |
1401 | &mdev_type_group3, | |
1402 | NULL, | |
1403 | }; | |
1404 | ||
1405 | static const struct mdev_parent_ops mdev_fops = { | |
1406 | .owner = THIS_MODULE, | |
1407 | .mdev_attr_groups = mdev_dev_groups, | |
1408 | .supported_type_groups = mdev_type_groups, | |
1409 | .create = mbochs_create, | |
1410 | .remove = mbochs_remove, | |
1411 | .open = mbochs_open, | |
1412 | .release = mbochs_close, | |
1413 | .read = mbochs_read, | |
1414 | .write = mbochs_write, | |
1415 | .ioctl = mbochs_ioctl, | |
1416 | .mmap = mbochs_mmap, | |
1417 | }; | |
1418 | ||
1419 | static const struct file_operations vd_fops = { | |
1420 | .owner = THIS_MODULE, | |
1421 | }; | |
1422 | ||
1423 | static void mbochs_device_release(struct device *dev) | |
1424 | { | |
1425 | /* nothing */ | |
1426 | } | |
1427 | ||
1428 | static int __init mbochs_dev_init(void) | |
1429 | { | |
1430 | int ret = 0; | |
1431 | ||
16355214 | 1432 | ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME); |
a5e6e650 GH |
1433 | if (ret < 0) { |
1434 | pr_err("Error: failed to register mbochs_dev, err: %d\n", ret); | |
1435 | return ret; | |
1436 | } | |
1437 | cdev_init(&mbochs_cdev, &vd_fops); | |
16355214 | 1438 | cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1); |
a5e6e650 GH |
1439 | pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt)); |
1440 | ||
1441 | mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME); | |
1442 | if (IS_ERR(mbochs_class)) { | |
1443 | pr_err("Error: failed to register mbochs_dev class\n"); | |
1444 | ret = PTR_ERR(mbochs_class); | |
1445 | goto failed1; | |
1446 | } | |
1447 | mbochs_dev.class = mbochs_class; | |
1448 | mbochs_dev.release = mbochs_device_release; | |
1449 | dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME); | |
1450 | ||
1451 | ret = device_register(&mbochs_dev); | |
1452 | if (ret) | |
1453 | goto failed2; | |
1454 | ||
1455 | ret = mdev_register_device(&mbochs_dev, &mdev_fops); | |
1456 | if (ret) | |
1457 | goto failed3; | |
1458 | ||
1459 | return 0; | |
1460 | ||
1461 | failed3: | |
1462 | device_unregister(&mbochs_dev); | |
1463 | failed2: | |
1464 | class_destroy(mbochs_class); | |
1465 | failed1: | |
1466 | cdev_del(&mbochs_cdev); | |
16355214 | 1467 | unregister_chrdev_region(mbochs_devt, MINORMASK + 1); |
a5e6e650 GH |
1468 | return ret; |
1469 | } | |
1470 | ||
1471 | static void __exit mbochs_dev_exit(void) | |
1472 | { | |
1473 | mbochs_dev.bus = NULL; | |
1474 | mdev_unregister_device(&mbochs_dev); | |
1475 | ||
1476 | device_unregister(&mbochs_dev); | |
1477 | cdev_del(&mbochs_cdev); | |
16355214 | 1478 | unregister_chrdev_region(mbochs_devt, MINORMASK + 1); |
a5e6e650 GH |
1479 | class_destroy(mbochs_class); |
1480 | mbochs_class = NULL; | |
1481 | } | |
1482 | ||
1483 | module_init(mbochs_dev_init) | |
1484 | module_exit(mbochs_dev_exit) |