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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> | |
a5e6e650 GH |
24 | #include <linux/kernel.h> |
25 | #include <linux/slab.h> | |
26 | #include <linux/vmalloc.h> | |
27 | #include <linux/cdev.h> | |
28 | #include <linux/vfio.h> | |
29 | #include <linux/iommu.h> | |
30 | #include <linux/sysfs.h> | |
31 | #include <linux/mdev.h> | |
32 | #include <linux/pci.h> | |
33 | #include <linux/dma-buf.h> | |
34 | #include <linux/highmem.h> | |
35 | #include <drm/drm_fourcc.h> | |
36 | #include <drm/drm_rect.h> | |
37 | #include <drm/drm_modeset_lock.h> | |
38 | #include <drm/drm_property.h> | |
39 | #include <drm/drm_plane.h> | |
40 | ||
41 | ||
42 | #define VBE_DISPI_INDEX_ID 0x0 | |
43 | #define VBE_DISPI_INDEX_XRES 0x1 | |
44 | #define VBE_DISPI_INDEX_YRES 0x2 | |
45 | #define VBE_DISPI_INDEX_BPP 0x3 | |
46 | #define VBE_DISPI_INDEX_ENABLE 0x4 | |
47 | #define VBE_DISPI_INDEX_BANK 0x5 | |
48 | #define VBE_DISPI_INDEX_VIRT_WIDTH 0x6 | |
49 | #define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7 | |
50 | #define VBE_DISPI_INDEX_X_OFFSET 0x8 | |
51 | #define VBE_DISPI_INDEX_Y_OFFSET 0x9 | |
52 | #define VBE_DISPI_INDEX_VIDEO_MEMORY_64K 0xa | |
53 | #define VBE_DISPI_INDEX_COUNT 0xb | |
54 | ||
55 | #define VBE_DISPI_ID0 0xB0C0 | |
56 | #define VBE_DISPI_ID1 0xB0C1 | |
57 | #define VBE_DISPI_ID2 0xB0C2 | |
58 | #define VBE_DISPI_ID3 0xB0C3 | |
59 | #define VBE_DISPI_ID4 0xB0C4 | |
60 | #define VBE_DISPI_ID5 0xB0C5 | |
61 | ||
62 | #define VBE_DISPI_DISABLED 0x00 | |
63 | #define VBE_DISPI_ENABLED 0x01 | |
64 | #define VBE_DISPI_GETCAPS 0x02 | |
65 | #define VBE_DISPI_8BIT_DAC 0x20 | |
66 | #define VBE_DISPI_LFB_ENABLED 0x40 | |
67 | #define VBE_DISPI_NOCLEARMEM 0x80 | |
68 | ||
69 | ||
70 | #define MBOCHS_NAME "mbochs" | |
71 | #define MBOCHS_CLASS_NAME "mbochs" | |
72 | ||
104c7405 GH |
73 | #define MBOCHS_EDID_REGION_INDEX VFIO_PCI_NUM_REGIONS |
74 | #define MBOCHS_NUM_REGIONS (MBOCHS_EDID_REGION_INDEX+1) | |
75 | ||
a5e6e650 GH |
76 | #define MBOCHS_CONFIG_SPACE_SIZE 0xff |
77 | #define MBOCHS_MMIO_BAR_OFFSET PAGE_SIZE | |
78 | #define MBOCHS_MMIO_BAR_SIZE PAGE_SIZE | |
104c7405 | 79 | #define MBOCHS_EDID_OFFSET (MBOCHS_MMIO_BAR_OFFSET + \ |
a5e6e650 | 80 | MBOCHS_MMIO_BAR_SIZE) |
104c7405 GH |
81 | #define MBOCHS_EDID_SIZE PAGE_SIZE |
82 | #define MBOCHS_MEMORY_BAR_OFFSET (MBOCHS_EDID_OFFSET + \ | |
83 | MBOCHS_EDID_SIZE) | |
84 | ||
85 | #define MBOCHS_EDID_BLOB_OFFSET (MBOCHS_EDID_SIZE/2) | |
a5e6e650 GH |
86 | |
87 | #define STORE_LE16(addr, val) (*(u16 *)addr = val) | |
88 | #define STORE_LE32(addr, val) (*(u32 *)addr = val) | |
89 | ||
90 | ||
91 | MODULE_LICENSE("GPL v2"); | |
92 | ||
93 | static int max_mbytes = 256; | |
94 | module_param_named(count, max_mbytes, int, 0444); | |
95 | MODULE_PARM_DESC(mem, "megabytes available to " MBOCHS_NAME " devices"); | |
96 | ||
97 | ||
98 | #define MBOCHS_TYPE_1 "small" | |
99 | #define MBOCHS_TYPE_2 "medium" | |
100 | #define MBOCHS_TYPE_3 "large" | |
101 | ||
da44c340 CH |
102 | static struct mbochs_type { |
103 | struct mdev_type type; | |
a5e6e650 | 104 | u32 mbytes; |
104c7405 GH |
105 | u32 max_x; |
106 | u32 max_y; | |
a5e6e650 GH |
107 | } mbochs_types[] = { |
108 | { | |
da44c340 | 109 | .type.sysfs_name = MBOCHS_TYPE_1, |
0bc79069 | 110 | .type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_1, |
a5e6e650 | 111 | .mbytes = 4, |
104c7405 GH |
112 | .max_x = 800, |
113 | .max_y = 600, | |
a5e6e650 | 114 | }, { |
da44c340 | 115 | .type.sysfs_name = MBOCHS_TYPE_2, |
0bc79069 | 116 | .type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_2, |
a5e6e650 | 117 | .mbytes = 16, |
104c7405 GH |
118 | .max_x = 1920, |
119 | .max_y = 1440, | |
a5e6e650 | 120 | }, { |
da44c340 | 121 | .type.sysfs_name = MBOCHS_TYPE_3, |
0bc79069 | 122 | .type.pretty_name = MBOCHS_CLASS_NAME "-" MBOCHS_TYPE_3, |
a5e6e650 | 123 | .mbytes = 64, |
104c7405 GH |
124 | .max_x = 0, |
125 | .max_y = 0, | |
a5e6e650 GH |
126 | }, |
127 | }; | |
128 | ||
da44c340 CH |
129 | static struct mdev_type *mbochs_mdev_types[] = { |
130 | &mbochs_types[0].type, | |
131 | &mbochs_types[1].type, | |
132 | &mbochs_types[2].type, | |
133 | }; | |
a5e6e650 GH |
134 | |
135 | static dev_t mbochs_devt; | |
136 | static struct class *mbochs_class; | |
137 | static struct cdev mbochs_cdev; | |
138 | static struct device mbochs_dev; | |
89345d51 | 139 | static struct mdev_parent mbochs_parent; |
de5494af | 140 | static atomic_t mbochs_avail_mbytes; |
681c1615 | 141 | static const struct vfio_device_ops mbochs_dev_ops; |
a5e6e650 | 142 | |
104c7405 GH |
143 | struct vfio_region_info_ext { |
144 | struct vfio_region_info base; | |
145 | struct vfio_region_info_cap_type type; | |
146 | }; | |
147 | ||
a5e6e650 GH |
148 | struct mbochs_mode { |
149 | u32 drm_format; | |
150 | u32 bytepp; | |
151 | u32 width; | |
152 | u32 height; | |
153 | u32 stride; | |
154 | u32 __pad; | |
155 | u64 offset; | |
156 | u64 size; | |
157 | }; | |
158 | ||
159 | struct mbochs_dmabuf { | |
160 | struct mbochs_mode mode; | |
161 | u32 id; | |
162 | struct page **pages; | |
163 | pgoff_t pagecount; | |
164 | struct dma_buf *buf; | |
165 | struct mdev_state *mdev_state; | |
166 | struct list_head next; | |
167 | bool unlinked; | |
168 | }; | |
169 | ||
170 | /* State of each mdev device */ | |
171 | struct mdev_state { | |
681c1615 | 172 | struct vfio_device vdev; |
a5e6e650 GH |
173 | u8 *vconfig; |
174 | u64 bar_mask[3]; | |
175 | u32 memory_bar_mask; | |
176 | struct mutex ops_lock; | |
177 | struct mdev_device *mdev; | |
a5e6e650 GH |
178 | |
179 | const struct mbochs_type *type; | |
180 | u16 vbe[VBE_DISPI_INDEX_COUNT]; | |
181 | u64 memsize; | |
182 | struct page **pages; | |
183 | pgoff_t pagecount; | |
104c7405 GH |
184 | struct vfio_region_gfx_edid edid_regs; |
185 | u8 edid_blob[0x400]; | |
a5e6e650 GH |
186 | |
187 | struct list_head dmabufs; | |
188 | u32 active_id; | |
189 | u32 next_id; | |
190 | }; | |
191 | ||
192 | static const char *vbe_name_list[VBE_DISPI_INDEX_COUNT] = { | |
193 | [VBE_DISPI_INDEX_ID] = "id", | |
194 | [VBE_DISPI_INDEX_XRES] = "xres", | |
195 | [VBE_DISPI_INDEX_YRES] = "yres", | |
196 | [VBE_DISPI_INDEX_BPP] = "bpp", | |
197 | [VBE_DISPI_INDEX_ENABLE] = "enable", | |
198 | [VBE_DISPI_INDEX_BANK] = "bank", | |
199 | [VBE_DISPI_INDEX_VIRT_WIDTH] = "virt-width", | |
200 | [VBE_DISPI_INDEX_VIRT_HEIGHT] = "virt-height", | |
201 | [VBE_DISPI_INDEX_X_OFFSET] = "x-offset", | |
202 | [VBE_DISPI_INDEX_Y_OFFSET] = "y-offset", | |
203 | [VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = "video-mem", | |
204 | }; | |
205 | ||
206 | static const char *vbe_name(u32 index) | |
207 | { | |
208 | if (index < ARRAY_SIZE(vbe_name_list)) | |
209 | return vbe_name_list[index]; | |
210 | return "(invalid)"; | |
211 | } | |
212 | ||
498e8bf5 AK |
213 | static struct page *__mbochs_get_page(struct mdev_state *mdev_state, |
214 | pgoff_t pgoff); | |
a5e6e650 GH |
215 | static struct page *mbochs_get_page(struct mdev_state *mdev_state, |
216 | pgoff_t pgoff); | |
217 | ||
a5e6e650 GH |
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 | ||
681c1615 JG |
438 | static ssize_t mdev_access(struct mdev_state *mdev_state, char *buf, |
439 | size_t count, loff_t pos, bool is_write) | |
a5e6e650 | 440 | { |
a5e6e650 GH |
441 | struct page *pg; |
442 | loff_t poff; | |
443 | char *map; | |
444 | int ret = 0; | |
445 | ||
446 | mutex_lock(&mdev_state->ops_lock); | |
447 | ||
448 | if (pos < MBOCHS_CONFIG_SPACE_SIZE) { | |
449 | if (is_write) | |
450 | handle_pci_cfg_write(mdev_state, pos, buf, count); | |
451 | else | |
452 | memcpy(buf, (mdev_state->vconfig + pos), count); | |
453 | ||
454 | } else if (pos >= MBOCHS_MMIO_BAR_OFFSET && | |
104c7405 GH |
455 | pos + count <= (MBOCHS_MMIO_BAR_OFFSET + |
456 | MBOCHS_MMIO_BAR_SIZE)) { | |
a5e6e650 GH |
457 | pos -= MBOCHS_MMIO_BAR_OFFSET; |
458 | if (is_write) | |
459 | handle_mmio_write(mdev_state, pos, buf, count); | |
460 | else | |
461 | handle_mmio_read(mdev_state, pos, buf, count); | |
462 | ||
104c7405 GH |
463 | } else if (pos >= MBOCHS_EDID_OFFSET && |
464 | pos + count <= (MBOCHS_EDID_OFFSET + | |
465 | MBOCHS_EDID_SIZE)) { | |
466 | pos -= MBOCHS_EDID_OFFSET; | |
467 | if (pos < MBOCHS_EDID_BLOB_OFFSET) { | |
468 | handle_edid_regs(mdev_state, pos, buf, count, is_write); | |
469 | } else { | |
470 | pos -= MBOCHS_EDID_BLOB_OFFSET; | |
471 | handle_edid_blob(mdev_state, pos, buf, count, is_write); | |
472 | } | |
473 | ||
a5e6e650 GH |
474 | } else if (pos >= MBOCHS_MEMORY_BAR_OFFSET && |
475 | pos + count <= | |
476 | MBOCHS_MEMORY_BAR_OFFSET + mdev_state->memsize) { | |
477 | pos -= MBOCHS_MMIO_BAR_OFFSET; | |
478 | poff = pos & ~PAGE_MASK; | |
498e8bf5 | 479 | pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT); |
a5e6e650 GH |
480 | map = kmap(pg); |
481 | if (is_write) | |
482 | memcpy(map + poff, buf, count); | |
483 | else | |
484 | memcpy(buf, map + poff, count); | |
485 | kunmap(pg); | |
486 | put_page(pg); | |
487 | ||
488 | } else { | |
681c1615 | 489 | dev_dbg(mdev_state->vdev.dev, "%s: %s @0x%llx (unhandled)\n", |
a5e6e650 GH |
490 | __func__, is_write ? "WR" : "RD", pos); |
491 | ret = -1; | |
492 | goto accessfailed; | |
493 | } | |
494 | ||
495 | ret = count; | |
496 | ||
497 | ||
498 | accessfailed: | |
499 | mutex_unlock(&mdev_state->ops_lock); | |
500 | ||
501 | return ret; | |
502 | } | |
503 | ||
681c1615 | 504 | static int mbochs_reset(struct mdev_state *mdev_state) |
a5e6e650 | 505 | { |
a5e6e650 GH |
506 | u32 size64k = mdev_state->memsize / (64 * 1024); |
507 | int i; | |
508 | ||
509 | for (i = 0; i < ARRAY_SIZE(mdev_state->vbe); i++) | |
510 | mdev_state->vbe[i] = 0; | |
511 | mdev_state->vbe[VBE_DISPI_INDEX_ID] = VBE_DISPI_ID5; | |
512 | mdev_state->vbe[VBE_DISPI_INDEX_VIDEO_MEMORY_64K] = size64k; | |
513 | return 0; | |
514 | } | |
515 | ||
3d5d18e1 | 516 | static int mbochs_init_dev(struct vfio_device *vdev) |
a5e6e650 | 517 | { |
3d5d18e1 YL |
518 | struct mdev_state *mdev_state = |
519 | container_of(vdev, struct mdev_state, vdev); | |
520 | struct mdev_device *mdev = to_mdev_device(vdev->dev); | |
da44c340 CH |
521 | struct mbochs_type *type = |
522 | container_of(mdev->type, struct mbochs_type, type); | |
3d5d18e1 | 523 | int avail_mbytes = atomic_read(&mbochs_avail_mbytes); |
681c1615 | 524 | int ret = -ENOMEM; |
a5e6e650 | 525 | |
de5494af JG |
526 | do { |
527 | if (avail_mbytes < type->mbytes) | |
528 | return -ENOSPC; | |
529 | } while (!atomic_try_cmpxchg(&mbochs_avail_mbytes, &avail_mbytes, | |
530 | avail_mbytes - type->mbytes)); | |
a5e6e650 | 531 | |
a5e6e650 | 532 | mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL); |
3d5d18e1 YL |
533 | if (!mdev_state->vconfig) |
534 | goto err_avail; | |
a5e6e650 GH |
535 | |
536 | mdev_state->memsize = type->mbytes * 1024 * 1024; | |
537 | mdev_state->pagecount = mdev_state->memsize >> PAGE_SHIFT; | |
538 | mdev_state->pages = kcalloc(mdev_state->pagecount, | |
539 | sizeof(struct page *), | |
540 | GFP_KERNEL); | |
541 | if (!mdev_state->pages) | |
3d5d18e1 | 542 | goto err_vconfig; |
a5e6e650 GH |
543 | |
544 | mutex_init(&mdev_state->ops_lock); | |
545 | mdev_state->mdev = mdev; | |
a5e6e650 GH |
546 | INIT_LIST_HEAD(&mdev_state->dmabufs); |
547 | mdev_state->next_id = 1; | |
548 | ||
549 | mdev_state->type = type; | |
104c7405 GH |
550 | mdev_state->edid_regs.max_xres = type->max_x; |
551 | mdev_state->edid_regs.max_yres = type->max_y; | |
552 | mdev_state->edid_regs.edid_offset = MBOCHS_EDID_BLOB_OFFSET; | |
553 | mdev_state->edid_regs.edid_max_size = sizeof(mdev_state->edid_blob); | |
a5e6e650 | 554 | mbochs_create_config_space(mdev_state); |
681c1615 | 555 | mbochs_reset(mdev_state); |
a5e6e650 | 556 | |
3d5d18e1 | 557 | dev_info(vdev->dev, "%s: %s, %d MB, %ld pages\n", __func__, |
0bc79069 | 558 | type->type.pretty_name, type->mbytes, mdev_state->pagecount); |
3d5d18e1 YL |
559 | return 0; |
560 | ||
561 | err_vconfig: | |
562 | kfree(mdev_state->vconfig); | |
563 | err_avail: | |
564 | atomic_add(type->mbytes, &mbochs_avail_mbytes); | |
565 | return ret; | |
566 | } | |
567 | ||
568 | static int mbochs_probe(struct mdev_device *mdev) | |
569 | { | |
570 | struct mdev_state *mdev_state; | |
571 | int ret = -ENOMEM; | |
572 | ||
573 | mdev_state = vfio_alloc_device(mdev_state, vdev, &mdev->dev, | |
574 | &mbochs_dev_ops); | |
575 | if (IS_ERR(mdev_state)) | |
576 | return PTR_ERR(mdev_state); | |
577 | ||
c68ea0d0 | 578 | ret = vfio_register_emulated_iommu_dev(&mdev_state->vdev); |
681c1615 | 579 | if (ret) |
3d5d18e1 | 580 | goto err_put_vdev; |
681c1615 | 581 | dev_set_drvdata(&mdev->dev, mdev_state); |
a5e6e650 | 582 | return 0; |
3d5d18e1 YL |
583 | |
584 | err_put_vdev: | |
585 | vfio_put_device(&mdev_state->vdev); | |
586 | return ret; | |
587 | } | |
588 | ||
589 | static void mbochs_release_dev(struct vfio_device *vdev) | |
590 | { | |
591 | struct mdev_state *mdev_state = | |
592 | container_of(vdev, struct mdev_state, vdev); | |
593 | ||
594 | atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes); | |
de5494af | 595 | kfree(mdev_state->pages); |
a5e6e650 | 596 | kfree(mdev_state->vconfig); |
3d5d18e1 | 597 | vfio_free_device(vdev); |
a5e6e650 GH |
598 | } |
599 | ||
681c1615 | 600 | static void mbochs_remove(struct mdev_device *mdev) |
a5e6e650 | 601 | { |
681c1615 | 602 | struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev); |
a5e6e650 | 603 | |
681c1615 | 604 | vfio_unregister_group_dev(&mdev_state->vdev); |
3d5d18e1 | 605 | vfio_put_device(&mdev_state->vdev); |
a5e6e650 GH |
606 | } |
607 | ||
681c1615 | 608 | static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf, |
a5e6e650 GH |
609 | size_t count, loff_t *ppos) |
610 | { | |
681c1615 JG |
611 | struct mdev_state *mdev_state = |
612 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 GH |
613 | unsigned int done = 0; |
614 | int ret; | |
615 | ||
616 | while (count) { | |
617 | size_t filled; | |
618 | ||
619 | if (count >= 4 && !(*ppos % 4)) { | |
620 | u32 val; | |
621 | ||
681c1615 | 622 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
623 | *ppos, false); |
624 | if (ret <= 0) | |
625 | goto read_err; | |
626 | ||
627 | if (copy_to_user(buf, &val, sizeof(val))) | |
628 | goto read_err; | |
629 | ||
630 | filled = 4; | |
631 | } else if (count >= 2 && !(*ppos % 2)) { | |
632 | u16 val; | |
633 | ||
681c1615 | 634 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
635 | *ppos, false); |
636 | if (ret <= 0) | |
637 | goto read_err; | |
638 | ||
639 | if (copy_to_user(buf, &val, sizeof(val))) | |
640 | goto read_err; | |
641 | ||
642 | filled = 2; | |
643 | } else { | |
644 | u8 val; | |
645 | ||
681c1615 | 646 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
647 | *ppos, false); |
648 | if (ret <= 0) | |
649 | goto read_err; | |
650 | ||
651 | if (copy_to_user(buf, &val, sizeof(val))) | |
652 | goto read_err; | |
653 | ||
654 | filled = 1; | |
655 | } | |
656 | ||
657 | count -= filled; | |
658 | done += filled; | |
659 | *ppos += filled; | |
660 | buf += filled; | |
661 | } | |
662 | ||
663 | return done; | |
664 | ||
665 | read_err: | |
666 | return -EFAULT; | |
667 | } | |
668 | ||
681c1615 | 669 | static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf, |
a5e6e650 GH |
670 | size_t count, loff_t *ppos) |
671 | { | |
681c1615 JG |
672 | struct mdev_state *mdev_state = |
673 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 GH |
674 | unsigned int done = 0; |
675 | int ret; | |
676 | ||
677 | while (count) { | |
678 | size_t filled; | |
679 | ||
680 | if (count >= 4 && !(*ppos % 4)) { | |
681 | u32 val; | |
682 | ||
683 | if (copy_from_user(&val, buf, sizeof(val))) | |
684 | goto write_err; | |
685 | ||
681c1615 | 686 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
687 | *ppos, true); |
688 | if (ret <= 0) | |
689 | goto write_err; | |
690 | ||
691 | filled = 4; | |
692 | } else if (count >= 2 && !(*ppos % 2)) { | |
693 | u16 val; | |
694 | ||
695 | if (copy_from_user(&val, buf, sizeof(val))) | |
696 | goto write_err; | |
697 | ||
681c1615 | 698 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
699 | *ppos, true); |
700 | if (ret <= 0) | |
701 | goto write_err; | |
702 | ||
703 | filled = 2; | |
704 | } else { | |
705 | u8 val; | |
706 | ||
707 | if (copy_from_user(&val, buf, sizeof(val))) | |
708 | goto write_err; | |
709 | ||
681c1615 | 710 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
711 | *ppos, true); |
712 | if (ret <= 0) | |
713 | goto write_err; | |
714 | ||
715 | filled = 1; | |
716 | } | |
717 | count -= filled; | |
718 | done += filled; | |
719 | *ppos += filled; | |
720 | buf += filled; | |
721 | } | |
722 | ||
723 | return done; | |
724 | write_err: | |
725 | return -EFAULT; | |
726 | } | |
727 | ||
728 | static struct page *__mbochs_get_page(struct mdev_state *mdev_state, | |
729 | pgoff_t pgoff) | |
730 | { | |
731 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
732 | ||
733 | if (!mdev_state->pages[pgoff]) { | |
734 | mdev_state->pages[pgoff] = | |
735 | alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0); | |
736 | if (!mdev_state->pages[pgoff]) | |
737 | return NULL; | |
738 | } | |
739 | ||
740 | get_page(mdev_state->pages[pgoff]); | |
741 | return mdev_state->pages[pgoff]; | |
742 | } | |
743 | ||
744 | static struct page *mbochs_get_page(struct mdev_state *mdev_state, | |
745 | pgoff_t pgoff) | |
746 | { | |
747 | struct page *page; | |
748 | ||
749 | if (WARN_ON(pgoff >= mdev_state->pagecount)) | |
750 | return NULL; | |
751 | ||
752 | mutex_lock(&mdev_state->ops_lock); | |
753 | page = __mbochs_get_page(mdev_state, pgoff); | |
754 | mutex_unlock(&mdev_state->ops_lock); | |
755 | ||
756 | return page; | |
757 | } | |
758 | ||
759 | static void mbochs_put_pages(struct mdev_state *mdev_state) | |
760 | { | |
761 | struct device *dev = mdev_dev(mdev_state->mdev); | |
762 | int i, count = 0; | |
763 | ||
764 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
765 | ||
766 | for (i = 0; i < mdev_state->pagecount; i++) { | |
767 | if (!mdev_state->pages[i]) | |
768 | continue; | |
769 | put_page(mdev_state->pages[i]); | |
770 | mdev_state->pages[i] = NULL; | |
771 | count++; | |
772 | } | |
773 | dev_dbg(dev, "%s: %d pages released\n", __func__, count); | |
774 | } | |
775 | ||
d7ef4899 | 776 | static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf) |
a5e6e650 GH |
777 | { |
778 | struct vm_area_struct *vma = vmf->vma; | |
779 | struct mdev_state *mdev_state = vma->vm_private_data; | |
780 | pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; | |
781 | ||
782 | if (page_offset >= mdev_state->pagecount) | |
783 | return VM_FAULT_SIGBUS; | |
784 | ||
785 | vmf->page = mbochs_get_page(mdev_state, page_offset); | |
786 | if (!vmf->page) | |
787 | return VM_FAULT_SIGBUS; | |
788 | ||
789 | return 0; | |
790 | } | |
791 | ||
792 | static const struct vm_operations_struct mbochs_region_vm_ops = { | |
793 | .fault = mbochs_region_vm_fault, | |
794 | }; | |
795 | ||
681c1615 | 796 | static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma) |
a5e6e650 | 797 | { |
681c1615 JG |
798 | struct mdev_state *mdev_state = |
799 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 GH |
800 | |
801 | if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT) | |
802 | return -EINVAL; | |
803 | if (vma->vm_end < vma->vm_start) | |
804 | return -EINVAL; | |
805 | if (vma->vm_end - vma->vm_start > mdev_state->memsize) | |
806 | return -EINVAL; | |
807 | if ((vma->vm_flags & VM_SHARED) == 0) | |
808 | return -EINVAL; | |
809 | ||
810 | vma->vm_ops = &mbochs_region_vm_ops; | |
811 | vma->vm_private_data = mdev_state; | |
812 | return 0; | |
813 | } | |
814 | ||
d7ef4899 | 815 | static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf) |
a5e6e650 GH |
816 | { |
817 | struct vm_area_struct *vma = vmf->vma; | |
818 | struct mbochs_dmabuf *dmabuf = vma->vm_private_data; | |
819 | ||
820 | if (WARN_ON(vmf->pgoff >= dmabuf->pagecount)) | |
821 | return VM_FAULT_SIGBUS; | |
822 | ||
823 | vmf->page = dmabuf->pages[vmf->pgoff]; | |
824 | get_page(vmf->page); | |
825 | return 0; | |
826 | } | |
827 | ||
828 | static const struct vm_operations_struct mbochs_dmabuf_vm_ops = { | |
829 | .fault = mbochs_dmabuf_vm_fault, | |
830 | }; | |
831 | ||
832 | static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma) | |
833 | { | |
834 | struct mbochs_dmabuf *dmabuf = buf->priv; | |
835 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
836 | ||
837 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
838 | ||
839 | if ((vma->vm_flags & VM_SHARED) == 0) | |
840 | return -EINVAL; | |
841 | ||
842 | vma->vm_ops = &mbochs_dmabuf_vm_ops; | |
843 | vma->vm_private_data = dmabuf; | |
844 | return 0; | |
845 | } | |
846 | ||
847 | static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf, | |
848 | const char *prefix) | |
849 | { | |
850 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
851 | u32 fourcc = dmabuf->mode.drm_format; | |
852 | ||
853 | dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n", | |
854 | prefix, dmabuf->id, | |
855 | fourcc ? ((fourcc >> 0) & 0xff) : '-', | |
856 | fourcc ? ((fourcc >> 8) & 0xff) : '-', | |
857 | fourcc ? ((fourcc >> 16) & 0xff) : '-', | |
858 | fourcc ? ((fourcc >> 24) & 0xff) : '-', | |
859 | dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride, | |
860 | dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount); | |
861 | } | |
862 | ||
863 | static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at, | |
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 | struct sg_table *sg; | |
869 | ||
870 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
871 | ||
872 | sg = kzalloc(sizeof(*sg), GFP_KERNEL); | |
873 | if (!sg) | |
874 | goto err1; | |
875 | if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount, | |
876 | 0, dmabuf->mode.size, GFP_KERNEL) < 0) | |
877 | goto err2; | |
be0704be | 878 | if (dma_map_sgtable(at->dev, sg, direction, 0)) |
a5e6e650 GH |
879 | goto err3; |
880 | ||
881 | return sg; | |
882 | ||
883 | err3: | |
884 | sg_free_table(sg); | |
885 | err2: | |
886 | kfree(sg); | |
887 | err1: | |
888 | return ERR_PTR(-ENOMEM); | |
889 | } | |
890 | ||
891 | static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at, | |
892 | struct sg_table *sg, | |
893 | enum dma_data_direction direction) | |
894 | { | |
895 | struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; | |
896 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
897 | ||
898 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
899 | ||
be0704be | 900 | dma_unmap_sgtable(at->dev, sg, direction, 0); |
a5e6e650 GH |
901 | sg_free_table(sg); |
902 | kfree(sg); | |
903 | } | |
904 | ||
905 | static void mbochs_release_dmabuf(struct dma_buf *buf) | |
906 | { | |
907 | struct mbochs_dmabuf *dmabuf = buf->priv; | |
908 | struct mdev_state *mdev_state = dmabuf->mdev_state; | |
909 | struct device *dev = mdev_dev(mdev_state->mdev); | |
910 | pgoff_t pg; | |
911 | ||
912 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
913 | ||
914 | for (pg = 0; pg < dmabuf->pagecount; pg++) | |
915 | put_page(dmabuf->pages[pg]); | |
916 | ||
917 | mutex_lock(&mdev_state->ops_lock); | |
918 | dmabuf->buf = NULL; | |
919 | if (dmabuf->unlinked) | |
920 | kfree(dmabuf); | |
921 | mutex_unlock(&mdev_state->ops_lock); | |
922 | } | |
923 | ||
a5e6e650 GH |
924 | static struct dma_buf_ops mbochs_dmabuf_ops = { |
925 | .map_dma_buf = mbochs_map_dmabuf, | |
926 | .unmap_dma_buf = mbochs_unmap_dmabuf, | |
927 | .release = mbochs_release_dmabuf, | |
a5e6e650 GH |
928 | .mmap = mbochs_mmap_dmabuf, |
929 | }; | |
930 | ||
931 | static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state, | |
932 | struct mbochs_mode *mode) | |
933 | { | |
934 | struct mbochs_dmabuf *dmabuf; | |
935 | pgoff_t page_offset, pg; | |
936 | ||
937 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
938 | ||
939 | dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL); | |
940 | if (!dmabuf) | |
941 | return NULL; | |
942 | ||
943 | dmabuf->mode = *mode; | |
944 | dmabuf->id = mdev_state->next_id++; | |
945 | dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE); | |
946 | dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *), | |
947 | GFP_KERNEL); | |
948 | if (!dmabuf->pages) | |
949 | goto err_free_dmabuf; | |
950 | ||
951 | page_offset = dmabuf->mode.offset >> PAGE_SHIFT; | |
952 | for (pg = 0; pg < dmabuf->pagecount; pg++) { | |
953 | dmabuf->pages[pg] = __mbochs_get_page(mdev_state, | |
954 | page_offset + pg); | |
955 | if (!dmabuf->pages[pg]) | |
956 | goto err_free_pages; | |
957 | } | |
958 | ||
959 | dmabuf->mdev_state = mdev_state; | |
960 | list_add(&dmabuf->next, &mdev_state->dmabufs); | |
961 | ||
962 | mbochs_print_dmabuf(dmabuf, __func__); | |
963 | return dmabuf; | |
964 | ||
965 | err_free_pages: | |
966 | while (pg > 0) | |
967 | put_page(dmabuf->pages[--pg]); | |
968 | kfree(dmabuf->pages); | |
969 | err_free_dmabuf: | |
970 | kfree(dmabuf); | |
971 | return NULL; | |
972 | } | |
973 | ||
974 | static struct mbochs_dmabuf * | |
975 | mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state, | |
976 | struct mbochs_mode *mode) | |
977 | { | |
978 | struct mbochs_dmabuf *dmabuf; | |
979 | ||
980 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
981 | ||
982 | list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) | |
983 | if (mbochs_modes_equal(&dmabuf->mode, mode)) | |
984 | return dmabuf; | |
985 | ||
986 | return NULL; | |
987 | } | |
988 | ||
989 | static struct mbochs_dmabuf * | |
990 | mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id) | |
991 | { | |
992 | struct mbochs_dmabuf *dmabuf; | |
993 | ||
994 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
995 | ||
996 | list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) | |
997 | if (dmabuf->id == id) | |
998 | return dmabuf; | |
999 | ||
1000 | return NULL; | |
1001 | } | |
1002 | ||
1003 | static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf) | |
1004 | { | |
1005 | struct mdev_state *mdev_state = dmabuf->mdev_state; | |
681c1615 | 1006 | struct device *dev = mdev_state->vdev.dev; |
a5e6e650 GH |
1007 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
1008 | struct dma_buf *buf; | |
1009 | ||
1010 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
1011 | ||
1012 | if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) { | |
1013 | dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n", | |
1014 | __func__); | |
1015 | return -EINVAL; | |
1016 | } | |
1017 | ||
1018 | exp_info.ops = &mbochs_dmabuf_ops; | |
1019 | exp_info.size = dmabuf->mode.size; | |
1020 | exp_info.priv = dmabuf; | |
1021 | ||
1022 | buf = dma_buf_export(&exp_info); | |
1023 | if (IS_ERR(buf)) { | |
1024 | dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n", | |
1025 | __func__, PTR_ERR(buf)); | |
1026 | return PTR_ERR(buf); | |
1027 | } | |
1028 | ||
1029 | dmabuf->buf = buf; | |
1030 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
1031 | return 0; | |
1032 | } | |
1033 | ||
681c1615 | 1034 | static int mbochs_get_region_info(struct mdev_state *mdev_state, |
104c7405 | 1035 | struct vfio_region_info_ext *ext) |
a5e6e650 | 1036 | { |
104c7405 | 1037 | struct vfio_region_info *region_info = &ext->base; |
a5e6e650 | 1038 | |
104c7405 | 1039 | if (region_info->index >= MBOCHS_NUM_REGIONS) |
a5e6e650 GH |
1040 | return -EINVAL; |
1041 | ||
1042 | switch (region_info->index) { | |
1043 | case VFIO_PCI_CONFIG_REGION_INDEX: | |
1044 | region_info->offset = 0; | |
1045 | region_info->size = MBOCHS_CONFIG_SPACE_SIZE; | |
1046 | region_info->flags = (VFIO_REGION_INFO_FLAG_READ | | |
1047 | VFIO_REGION_INFO_FLAG_WRITE); | |
1048 | break; | |
1049 | case VFIO_PCI_BAR0_REGION_INDEX: | |
1050 | region_info->offset = MBOCHS_MEMORY_BAR_OFFSET; | |
1051 | region_info->size = mdev_state->memsize; | |
1052 | region_info->flags = (VFIO_REGION_INFO_FLAG_READ | | |
1053 | VFIO_REGION_INFO_FLAG_WRITE | | |
1054 | VFIO_REGION_INFO_FLAG_MMAP); | |
1055 | break; | |
1056 | case VFIO_PCI_BAR2_REGION_INDEX: | |
1057 | region_info->offset = MBOCHS_MMIO_BAR_OFFSET; | |
1058 | region_info->size = MBOCHS_MMIO_BAR_SIZE; | |
1059 | region_info->flags = (VFIO_REGION_INFO_FLAG_READ | | |
1060 | VFIO_REGION_INFO_FLAG_WRITE); | |
1061 | break; | |
104c7405 GH |
1062 | case MBOCHS_EDID_REGION_INDEX: |
1063 | ext->base.argsz = sizeof(*ext); | |
1064 | ext->base.offset = MBOCHS_EDID_OFFSET; | |
1065 | ext->base.size = MBOCHS_EDID_SIZE; | |
1066 | ext->base.flags = (VFIO_REGION_INFO_FLAG_READ | | |
1067 | VFIO_REGION_INFO_FLAG_WRITE | | |
1068 | VFIO_REGION_INFO_FLAG_CAPS); | |
1069 | ext->base.cap_offset = offsetof(typeof(*ext), type); | |
1070 | ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE; | |
1071 | ext->type.header.version = 1; | |
1072 | ext->type.header.next = 0; | |
1073 | ext->type.type = VFIO_REGION_TYPE_GFX; | |
1074 | ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID; | |
1075 | break; | |
a5e6e650 GH |
1076 | default: |
1077 | region_info->size = 0; | |
1078 | region_info->offset = 0; | |
1079 | region_info->flags = 0; | |
1080 | } | |
1081 | ||
1082 | return 0; | |
1083 | } | |
1084 | ||
681c1615 | 1085 | static int mbochs_get_irq_info(struct vfio_irq_info *irq_info) |
a5e6e650 GH |
1086 | { |
1087 | irq_info->count = 0; | |
1088 | return 0; | |
1089 | } | |
1090 | ||
681c1615 | 1091 | static int mbochs_get_device_info(struct vfio_device_info *dev_info) |
a5e6e650 GH |
1092 | { |
1093 | dev_info->flags = VFIO_DEVICE_FLAGS_PCI; | |
104c7405 | 1094 | dev_info->num_regions = MBOCHS_NUM_REGIONS; |
a5e6e650 GH |
1095 | dev_info->num_irqs = VFIO_PCI_NUM_IRQS; |
1096 | return 0; | |
1097 | } | |
1098 | ||
681c1615 | 1099 | static int mbochs_query_gfx_plane(struct mdev_state *mdev_state, |
a5e6e650 GH |
1100 | struct vfio_device_gfx_plane_info *plane) |
1101 | { | |
a5e6e650 GH |
1102 | struct mbochs_dmabuf *dmabuf; |
1103 | struct mbochs_mode mode; | |
1104 | int ret; | |
1105 | ||
1106 | if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) { | |
1107 | if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE | | |
1108 | VFIO_GFX_PLANE_TYPE_DMABUF)) | |
1109 | return 0; | |
1110 | return -EINVAL; | |
1111 | } | |
1112 | ||
1113 | if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF) | |
1114 | return -EINVAL; | |
1115 | ||
1116 | plane->drm_format_mod = 0; | |
1117 | plane->x_pos = 0; | |
1118 | plane->y_pos = 0; | |
1119 | plane->x_hot = 0; | |
1120 | plane->y_hot = 0; | |
1121 | ||
1122 | mutex_lock(&mdev_state->ops_lock); | |
1123 | ||
1124 | ret = -EINVAL; | |
1125 | if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY) | |
1126 | ret = mbochs_check_framebuffer(mdev_state, &mode); | |
1127 | if (ret < 0) { | |
1128 | plane->drm_format = 0; | |
1129 | plane->width = 0; | |
1130 | plane->height = 0; | |
1131 | plane->stride = 0; | |
1132 | plane->size = 0; | |
1133 | plane->dmabuf_id = 0; | |
1134 | goto done; | |
1135 | } | |
1136 | ||
1137 | dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode); | |
1138 | if (!dmabuf) | |
1139 | mbochs_dmabuf_alloc(mdev_state, &mode); | |
1140 | if (!dmabuf) { | |
1141 | mutex_unlock(&mdev_state->ops_lock); | |
1142 | return -ENOMEM; | |
1143 | } | |
1144 | ||
1145 | plane->drm_format = dmabuf->mode.drm_format; | |
1146 | plane->width = dmabuf->mode.width; | |
1147 | plane->height = dmabuf->mode.height; | |
1148 | plane->stride = dmabuf->mode.stride; | |
1149 | plane->size = dmabuf->mode.size; | |
1150 | plane->dmabuf_id = dmabuf->id; | |
1151 | ||
1152 | done: | |
1153 | if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY && | |
1154 | mdev_state->active_id != plane->dmabuf_id) { | |
681c1615 JG |
1155 | dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n", |
1156 | __func__, mdev_state->active_id, plane->dmabuf_id); | |
a5e6e650 GH |
1157 | mdev_state->active_id = plane->dmabuf_id; |
1158 | } | |
1159 | mutex_unlock(&mdev_state->ops_lock); | |
1160 | return 0; | |
1161 | } | |
1162 | ||
681c1615 | 1163 | static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id) |
a5e6e650 | 1164 | { |
a5e6e650 GH |
1165 | struct mbochs_dmabuf *dmabuf; |
1166 | ||
1167 | mutex_lock(&mdev_state->ops_lock); | |
1168 | ||
1169 | dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id); | |
1170 | if (!dmabuf) { | |
1171 | mutex_unlock(&mdev_state->ops_lock); | |
1172 | return -ENOENT; | |
1173 | } | |
1174 | ||
1175 | if (!dmabuf->buf) | |
1176 | mbochs_dmabuf_export(dmabuf); | |
1177 | ||
1178 | mutex_unlock(&mdev_state->ops_lock); | |
1179 | ||
1180 | if (!dmabuf->buf) | |
1181 | return -EINVAL; | |
1182 | ||
1183 | return dma_buf_fd(dmabuf->buf, 0); | |
1184 | } | |
1185 | ||
681c1615 JG |
1186 | static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd, |
1187 | unsigned long arg) | |
a5e6e650 | 1188 | { |
681c1615 JG |
1189 | struct mdev_state *mdev_state = |
1190 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 | 1191 | int ret = 0; |
104c7405 | 1192 | unsigned long minsz, outsz; |
a5e6e650 GH |
1193 | |
1194 | switch (cmd) { | |
1195 | case VFIO_DEVICE_GET_INFO: | |
1196 | { | |
1197 | struct vfio_device_info info; | |
1198 | ||
1199 | minsz = offsetofend(struct vfio_device_info, num_irqs); | |
1200 | ||
1201 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1202 | return -EFAULT; | |
1203 | ||
1204 | if (info.argsz < minsz) | |
1205 | return -EINVAL; | |
1206 | ||
681c1615 | 1207 | ret = mbochs_get_device_info(&info); |
a5e6e650 GH |
1208 | if (ret) |
1209 | return ret; | |
1210 | ||
a5e6e650 GH |
1211 | if (copy_to_user((void __user *)arg, &info, minsz)) |
1212 | return -EFAULT; | |
1213 | ||
1214 | return 0; | |
1215 | } | |
1216 | case VFIO_DEVICE_GET_REGION_INFO: | |
1217 | { | |
104c7405 | 1218 | struct vfio_region_info_ext info; |
a5e6e650 | 1219 | |
104c7405 | 1220 | minsz = offsetofend(typeof(info), base.offset); |
a5e6e650 GH |
1221 | |
1222 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1223 | return -EFAULT; | |
1224 | ||
104c7405 GH |
1225 | outsz = info.base.argsz; |
1226 | if (outsz < minsz) | |
1227 | return -EINVAL; | |
1228 | if (outsz > sizeof(info)) | |
a5e6e650 GH |
1229 | return -EINVAL; |
1230 | ||
681c1615 | 1231 | ret = mbochs_get_region_info(mdev_state, &info); |
a5e6e650 GH |
1232 | if (ret) |
1233 | return ret; | |
1234 | ||
104c7405 | 1235 | if (copy_to_user((void __user *)arg, &info, outsz)) |
a5e6e650 GH |
1236 | return -EFAULT; |
1237 | ||
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | case VFIO_DEVICE_GET_IRQ_INFO: | |
1242 | { | |
1243 | struct vfio_irq_info info; | |
1244 | ||
1245 | minsz = offsetofend(struct vfio_irq_info, count); | |
1246 | ||
1247 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1248 | return -EFAULT; | |
1249 | ||
1250 | if ((info.argsz < minsz) || | |
104c7405 | 1251 | (info.index >= VFIO_PCI_NUM_IRQS)) |
a5e6e650 GH |
1252 | return -EINVAL; |
1253 | ||
681c1615 | 1254 | ret = mbochs_get_irq_info(&info); |
a5e6e650 GH |
1255 | if (ret) |
1256 | return ret; | |
1257 | ||
1258 | if (copy_to_user((void __user *)arg, &info, minsz)) | |
1259 | return -EFAULT; | |
1260 | ||
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | case VFIO_DEVICE_QUERY_GFX_PLANE: | |
1265 | { | |
1266 | struct vfio_device_gfx_plane_info plane; | |
1267 | ||
1268 | minsz = offsetofend(struct vfio_device_gfx_plane_info, | |
1269 | region_index); | |
1270 | ||
1271 | if (copy_from_user(&plane, (void __user *)arg, minsz)) | |
1272 | return -EFAULT; | |
1273 | ||
1274 | if (plane.argsz < minsz) | |
1275 | return -EINVAL; | |
1276 | ||
681c1615 | 1277 | ret = mbochs_query_gfx_plane(mdev_state, &plane); |
a5e6e650 GH |
1278 | if (ret) |
1279 | return ret; | |
1280 | ||
1281 | if (copy_to_user((void __user *)arg, &plane, minsz)) | |
1282 | return -EFAULT; | |
1283 | ||
1284 | return 0; | |
1285 | } | |
1286 | ||
1287 | case VFIO_DEVICE_GET_GFX_DMABUF: | |
1288 | { | |
1289 | u32 dmabuf_id; | |
1290 | ||
1291 | if (get_user(dmabuf_id, (__u32 __user *)arg)) | |
1292 | return -EFAULT; | |
1293 | ||
681c1615 | 1294 | return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id); |
a5e6e650 GH |
1295 | } |
1296 | ||
1297 | case VFIO_DEVICE_SET_IRQS: | |
1298 | return -EINVAL; | |
1299 | ||
1300 | case VFIO_DEVICE_RESET: | |
681c1615 | 1301 | return mbochs_reset(mdev_state); |
a5e6e650 GH |
1302 | } |
1303 | return -ENOTTY; | |
1304 | } | |
1305 | ||
3cb24827 | 1306 | static void mbochs_close_device(struct vfio_device *vdev) |
a5e6e650 | 1307 | { |
681c1615 JG |
1308 | struct mdev_state *mdev_state = |
1309 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 GH |
1310 | struct mbochs_dmabuf *dmabuf, *tmp; |
1311 | ||
1312 | mutex_lock(&mdev_state->ops_lock); | |
1313 | ||
1314 | list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) { | |
1315 | list_del(&dmabuf->next); | |
1316 | if (dmabuf->buf) { | |
1317 | /* free in mbochs_release_dmabuf() */ | |
1318 | dmabuf->unlinked = true; | |
1319 | } else { | |
1320 | kfree(dmabuf); | |
1321 | } | |
1322 | } | |
1323 | mbochs_put_pages(mdev_state); | |
1324 | ||
1325 | mutex_unlock(&mdev_state->ops_lock); | |
a5e6e650 GH |
1326 | } |
1327 | ||
1328 | static ssize_t | |
1329 | memory_show(struct device *dev, struct device_attribute *attr, | |
1330 | char *buf) | |
1331 | { | |
681c1615 | 1332 | struct mdev_state *mdev_state = dev_get_drvdata(dev); |
a5e6e650 GH |
1333 | |
1334 | return sprintf(buf, "%d MB\n", mdev_state->type->mbytes); | |
1335 | } | |
1336 | static DEVICE_ATTR_RO(memory); | |
1337 | ||
1338 | static struct attribute *mdev_dev_attrs[] = { | |
1339 | &dev_attr_memory.attr, | |
1340 | NULL, | |
1341 | }; | |
1342 | ||
1343 | static const struct attribute_group mdev_dev_group = { | |
1344 | .name = "vendor", | |
1345 | .attrs = mdev_dev_attrs, | |
1346 | }; | |
1347 | ||
6cbf507f | 1348 | static const struct attribute_group *mdev_dev_groups[] = { |
a5e6e650 GH |
1349 | &mdev_dev_group, |
1350 | NULL, | |
1351 | }; | |
1352 | ||
685a1537 | 1353 | static ssize_t mbochs_show_description(struct mdev_type *mtype, char *buf) |
a5e6e650 | 1354 | { |
da44c340 CH |
1355 | struct mbochs_type *type = |
1356 | container_of(mtype, struct mbochs_type, type); | |
a5e6e650 GH |
1357 | |
1358 | return sprintf(buf, "virtual display, %d MB video memory\n", | |
1359 | type ? type->mbytes : 0); | |
1360 | } | |
a5e6e650 | 1361 | |
f2fbc72e | 1362 | static unsigned int mbochs_get_available(struct mdev_type *mtype) |
a5e6e650 | 1363 | { |
da44c340 CH |
1364 | struct mbochs_type *type = |
1365 | container_of(mtype, struct mbochs_type, type); | |
a5e6e650 | 1366 | |
f2fbc72e | 1367 | return atomic_read(&mbochs_avail_mbytes) / type->mbytes; |
a5e6e650 | 1368 | } |
a5e6e650 | 1369 | |
681c1615 | 1370 | static const struct vfio_device_ops mbochs_dev_ops = { |
3cb24827 | 1371 | .close_device = mbochs_close_device, |
3d5d18e1 YL |
1372 | .init = mbochs_init_dev, |
1373 | .release = mbochs_release_dev, | |
681c1615 JG |
1374 | .read = mbochs_read, |
1375 | .write = mbochs_write, | |
1376 | .ioctl = mbochs_ioctl, | |
1377 | .mmap = mbochs_mmap, | |
1378 | }; | |
1379 | ||
1380 | static struct mdev_driver mbochs_driver = { | |
290aac5d | 1381 | .device_api = VFIO_DEVICE_API_PCI_STRING, |
681c1615 JG |
1382 | .driver = { |
1383 | .name = "mbochs", | |
1384 | .owner = THIS_MODULE, | |
1385 | .mod_name = KBUILD_MODNAME, | |
1386 | .dev_groups = mdev_dev_groups, | |
1387 | }, | |
1388 | .probe = mbochs_probe, | |
1389 | .remove = mbochs_remove, | |
f2fbc72e | 1390 | .get_available = mbochs_get_available, |
685a1537 | 1391 | .show_description = mbochs_show_description, |
a5e6e650 GH |
1392 | }; |
1393 | ||
1394 | static const struct file_operations vd_fops = { | |
1395 | .owner = THIS_MODULE, | |
1396 | }; | |
1397 | ||
1398 | static void mbochs_device_release(struct device *dev) | |
1399 | { | |
1400 | /* nothing */ | |
1401 | } | |
1402 | ||
1403 | static int __init mbochs_dev_init(void) | |
1404 | { | |
1405 | int ret = 0; | |
1406 | ||
de5494af JG |
1407 | atomic_set(&mbochs_avail_mbytes, max_mbytes); |
1408 | ||
16355214 | 1409 | ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME); |
a5e6e650 GH |
1410 | if (ret < 0) { |
1411 | pr_err("Error: failed to register mbochs_dev, err: %d\n", ret); | |
1412 | return ret; | |
1413 | } | |
1414 | cdev_init(&mbochs_cdev, &vd_fops); | |
16355214 | 1415 | cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1); |
a5e6e650 GH |
1416 | pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt)); |
1417 | ||
681c1615 JG |
1418 | ret = mdev_register_driver(&mbochs_driver); |
1419 | if (ret) | |
1420 | goto err_cdev; | |
1421 | ||
a5e6e650 GH |
1422 | mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME); |
1423 | if (IS_ERR(mbochs_class)) { | |
1424 | pr_err("Error: failed to register mbochs_dev class\n"); | |
1425 | ret = PTR_ERR(mbochs_class); | |
681c1615 | 1426 | goto err_driver; |
a5e6e650 GH |
1427 | } |
1428 | mbochs_dev.class = mbochs_class; | |
1429 | mbochs_dev.release = mbochs_device_release; | |
1430 | dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME); | |
1431 | ||
1432 | ret = device_register(&mbochs_dev); | |
1433 | if (ret) | |
681c1615 | 1434 | goto err_class; |
a5e6e650 | 1435 | |
da44c340 CH |
1436 | ret = mdev_register_parent(&mbochs_parent, &mbochs_dev, &mbochs_driver, |
1437 | mbochs_mdev_types, | |
1438 | ARRAY_SIZE(mbochs_mdev_types)); | |
a5e6e650 | 1439 | if (ret) |
681c1615 | 1440 | goto err_device; |
a5e6e650 GH |
1441 | |
1442 | return 0; | |
1443 | ||
681c1615 | 1444 | err_device: |
a5e6e650 | 1445 | device_unregister(&mbochs_dev); |
681c1615 | 1446 | err_class: |
a5e6e650 | 1447 | class_destroy(mbochs_class); |
681c1615 JG |
1448 | err_driver: |
1449 | mdev_unregister_driver(&mbochs_driver); | |
1450 | err_cdev: | |
a5e6e650 | 1451 | cdev_del(&mbochs_cdev); |
16355214 | 1452 | unregister_chrdev_region(mbochs_devt, MINORMASK + 1); |
a5e6e650 GH |
1453 | return ret; |
1454 | } | |
1455 | ||
1456 | static void __exit mbochs_dev_exit(void) | |
1457 | { | |
1458 | mbochs_dev.bus = NULL; | |
89345d51 | 1459 | mdev_unregister_parent(&mbochs_parent); |
a5e6e650 GH |
1460 | |
1461 | device_unregister(&mbochs_dev); | |
681c1615 | 1462 | mdev_unregister_driver(&mbochs_driver); |
a5e6e650 | 1463 | cdev_del(&mbochs_cdev); |
16355214 | 1464 | unregister_chrdev_region(mbochs_devt, MINORMASK + 1); |
a5e6e650 GH |
1465 | class_destroy(mbochs_class); |
1466 | mbochs_class = NULL; | |
1467 | } | |
1468 | ||
16b0314a | 1469 | MODULE_IMPORT_NS(DMA_BUF); |
a5e6e650 GH |
1470 | module_init(mbochs_dev_init) |
1471 | module_exit(mbochs_dev_exit) |