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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); |
a5e6e650 GH |
597 | } |
598 | ||
681c1615 | 599 | static void mbochs_remove(struct mdev_device *mdev) |
a5e6e650 | 600 | { |
681c1615 | 601 | struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev); |
a5e6e650 | 602 | |
681c1615 | 603 | vfio_unregister_group_dev(&mdev_state->vdev); |
3d5d18e1 | 604 | vfio_put_device(&mdev_state->vdev); |
a5e6e650 GH |
605 | } |
606 | ||
681c1615 | 607 | static ssize_t mbochs_read(struct vfio_device *vdev, char __user *buf, |
a5e6e650 GH |
608 | size_t count, loff_t *ppos) |
609 | { | |
681c1615 JG |
610 | struct mdev_state *mdev_state = |
611 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 GH |
612 | unsigned int done = 0; |
613 | int ret; | |
614 | ||
615 | while (count) { | |
616 | size_t filled; | |
617 | ||
618 | if (count >= 4 && !(*ppos % 4)) { | |
619 | u32 val; | |
620 | ||
681c1615 | 621 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
622 | *ppos, false); |
623 | if (ret <= 0) | |
624 | goto read_err; | |
625 | ||
626 | if (copy_to_user(buf, &val, sizeof(val))) | |
627 | goto read_err; | |
628 | ||
629 | filled = 4; | |
630 | } else if (count >= 2 && !(*ppos % 2)) { | |
631 | u16 val; | |
632 | ||
681c1615 | 633 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
634 | *ppos, false); |
635 | if (ret <= 0) | |
636 | goto read_err; | |
637 | ||
638 | if (copy_to_user(buf, &val, sizeof(val))) | |
639 | goto read_err; | |
640 | ||
641 | filled = 2; | |
642 | } else { | |
643 | u8 val; | |
644 | ||
681c1615 | 645 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
646 | *ppos, false); |
647 | if (ret <= 0) | |
648 | goto read_err; | |
649 | ||
650 | if (copy_to_user(buf, &val, sizeof(val))) | |
651 | goto read_err; | |
652 | ||
653 | filled = 1; | |
654 | } | |
655 | ||
656 | count -= filled; | |
657 | done += filled; | |
658 | *ppos += filled; | |
659 | buf += filled; | |
660 | } | |
661 | ||
662 | return done; | |
663 | ||
664 | read_err: | |
665 | return -EFAULT; | |
666 | } | |
667 | ||
681c1615 | 668 | static ssize_t mbochs_write(struct vfio_device *vdev, const char __user *buf, |
a5e6e650 GH |
669 | size_t count, loff_t *ppos) |
670 | { | |
681c1615 JG |
671 | struct mdev_state *mdev_state = |
672 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 GH |
673 | unsigned int done = 0; |
674 | int ret; | |
675 | ||
676 | while (count) { | |
677 | size_t filled; | |
678 | ||
679 | if (count >= 4 && !(*ppos % 4)) { | |
680 | u32 val; | |
681 | ||
682 | if (copy_from_user(&val, buf, sizeof(val))) | |
683 | goto write_err; | |
684 | ||
681c1615 | 685 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
686 | *ppos, true); |
687 | if (ret <= 0) | |
688 | goto write_err; | |
689 | ||
690 | filled = 4; | |
691 | } else if (count >= 2 && !(*ppos % 2)) { | |
692 | u16 val; | |
693 | ||
694 | if (copy_from_user(&val, buf, sizeof(val))) | |
695 | goto write_err; | |
696 | ||
681c1615 | 697 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
698 | *ppos, true); |
699 | if (ret <= 0) | |
700 | goto write_err; | |
701 | ||
702 | filled = 2; | |
703 | } else { | |
704 | u8 val; | |
705 | ||
706 | if (copy_from_user(&val, buf, sizeof(val))) | |
707 | goto write_err; | |
708 | ||
681c1615 | 709 | ret = mdev_access(mdev_state, (char *)&val, sizeof(val), |
a5e6e650 GH |
710 | *ppos, true); |
711 | if (ret <= 0) | |
712 | goto write_err; | |
713 | ||
714 | filled = 1; | |
715 | } | |
716 | count -= filled; | |
717 | done += filled; | |
718 | *ppos += filled; | |
719 | buf += filled; | |
720 | } | |
721 | ||
722 | return done; | |
723 | write_err: | |
724 | return -EFAULT; | |
725 | } | |
726 | ||
727 | static struct page *__mbochs_get_page(struct mdev_state *mdev_state, | |
728 | pgoff_t pgoff) | |
729 | { | |
730 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
731 | ||
732 | if (!mdev_state->pages[pgoff]) { | |
733 | mdev_state->pages[pgoff] = | |
734 | alloc_pages(GFP_HIGHUSER | __GFP_ZERO, 0); | |
735 | if (!mdev_state->pages[pgoff]) | |
736 | return NULL; | |
737 | } | |
738 | ||
739 | get_page(mdev_state->pages[pgoff]); | |
740 | return mdev_state->pages[pgoff]; | |
741 | } | |
742 | ||
743 | static struct page *mbochs_get_page(struct mdev_state *mdev_state, | |
744 | pgoff_t pgoff) | |
745 | { | |
746 | struct page *page; | |
747 | ||
748 | if (WARN_ON(pgoff >= mdev_state->pagecount)) | |
749 | return NULL; | |
750 | ||
751 | mutex_lock(&mdev_state->ops_lock); | |
752 | page = __mbochs_get_page(mdev_state, pgoff); | |
753 | mutex_unlock(&mdev_state->ops_lock); | |
754 | ||
755 | return page; | |
756 | } | |
757 | ||
758 | static void mbochs_put_pages(struct mdev_state *mdev_state) | |
759 | { | |
760 | struct device *dev = mdev_dev(mdev_state->mdev); | |
761 | int i, count = 0; | |
762 | ||
763 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
764 | ||
765 | for (i = 0; i < mdev_state->pagecount; i++) { | |
766 | if (!mdev_state->pages[i]) | |
767 | continue; | |
768 | put_page(mdev_state->pages[i]); | |
769 | mdev_state->pages[i] = NULL; | |
770 | count++; | |
771 | } | |
772 | dev_dbg(dev, "%s: %d pages released\n", __func__, count); | |
773 | } | |
774 | ||
d7ef4899 | 775 | static vm_fault_t mbochs_region_vm_fault(struct vm_fault *vmf) |
a5e6e650 GH |
776 | { |
777 | struct vm_area_struct *vma = vmf->vma; | |
778 | struct mdev_state *mdev_state = vma->vm_private_data; | |
779 | pgoff_t page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; | |
780 | ||
781 | if (page_offset >= mdev_state->pagecount) | |
782 | return VM_FAULT_SIGBUS; | |
783 | ||
784 | vmf->page = mbochs_get_page(mdev_state, page_offset); | |
785 | if (!vmf->page) | |
786 | return VM_FAULT_SIGBUS; | |
787 | ||
788 | return 0; | |
789 | } | |
790 | ||
791 | static const struct vm_operations_struct mbochs_region_vm_ops = { | |
792 | .fault = mbochs_region_vm_fault, | |
793 | }; | |
794 | ||
681c1615 | 795 | static int mbochs_mmap(struct vfio_device *vdev, struct vm_area_struct *vma) |
a5e6e650 | 796 | { |
681c1615 JG |
797 | struct mdev_state *mdev_state = |
798 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 GH |
799 | |
800 | if (vma->vm_pgoff != MBOCHS_MEMORY_BAR_OFFSET >> PAGE_SHIFT) | |
801 | return -EINVAL; | |
802 | if (vma->vm_end < vma->vm_start) | |
803 | return -EINVAL; | |
804 | if (vma->vm_end - vma->vm_start > mdev_state->memsize) | |
805 | return -EINVAL; | |
806 | if ((vma->vm_flags & VM_SHARED) == 0) | |
807 | return -EINVAL; | |
808 | ||
809 | vma->vm_ops = &mbochs_region_vm_ops; | |
810 | vma->vm_private_data = mdev_state; | |
811 | return 0; | |
812 | } | |
813 | ||
d7ef4899 | 814 | static vm_fault_t mbochs_dmabuf_vm_fault(struct vm_fault *vmf) |
a5e6e650 GH |
815 | { |
816 | struct vm_area_struct *vma = vmf->vma; | |
817 | struct mbochs_dmabuf *dmabuf = vma->vm_private_data; | |
818 | ||
819 | if (WARN_ON(vmf->pgoff >= dmabuf->pagecount)) | |
820 | return VM_FAULT_SIGBUS; | |
821 | ||
822 | vmf->page = dmabuf->pages[vmf->pgoff]; | |
823 | get_page(vmf->page); | |
824 | return 0; | |
825 | } | |
826 | ||
827 | static const struct vm_operations_struct mbochs_dmabuf_vm_ops = { | |
828 | .fault = mbochs_dmabuf_vm_fault, | |
829 | }; | |
830 | ||
831 | static int mbochs_mmap_dmabuf(struct dma_buf *buf, struct vm_area_struct *vma) | |
832 | { | |
833 | struct mbochs_dmabuf *dmabuf = buf->priv; | |
834 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
835 | ||
836 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
837 | ||
838 | if ((vma->vm_flags & VM_SHARED) == 0) | |
839 | return -EINVAL; | |
840 | ||
841 | vma->vm_ops = &mbochs_dmabuf_vm_ops; | |
842 | vma->vm_private_data = dmabuf; | |
843 | return 0; | |
844 | } | |
845 | ||
846 | static void mbochs_print_dmabuf(struct mbochs_dmabuf *dmabuf, | |
847 | const char *prefix) | |
848 | { | |
849 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
850 | u32 fourcc = dmabuf->mode.drm_format; | |
851 | ||
852 | dev_dbg(dev, "%s/%d: %c%c%c%c, %dx%d, stride %d, off 0x%llx, size 0x%llx, pages %ld\n", | |
853 | prefix, dmabuf->id, | |
854 | fourcc ? ((fourcc >> 0) & 0xff) : '-', | |
855 | fourcc ? ((fourcc >> 8) & 0xff) : '-', | |
856 | fourcc ? ((fourcc >> 16) & 0xff) : '-', | |
857 | fourcc ? ((fourcc >> 24) & 0xff) : '-', | |
858 | dmabuf->mode.width, dmabuf->mode.height, dmabuf->mode.stride, | |
859 | dmabuf->mode.offset, dmabuf->mode.size, dmabuf->pagecount); | |
860 | } | |
861 | ||
862 | static struct sg_table *mbochs_map_dmabuf(struct dma_buf_attachment *at, | |
863 | enum dma_data_direction direction) | |
864 | { | |
865 | struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; | |
866 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
867 | struct sg_table *sg; | |
868 | ||
869 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
870 | ||
871 | sg = kzalloc(sizeof(*sg), GFP_KERNEL); | |
872 | if (!sg) | |
873 | goto err1; | |
874 | if (sg_alloc_table_from_pages(sg, dmabuf->pages, dmabuf->pagecount, | |
875 | 0, dmabuf->mode.size, GFP_KERNEL) < 0) | |
876 | goto err2; | |
be0704be | 877 | if (dma_map_sgtable(at->dev, sg, direction, 0)) |
a5e6e650 GH |
878 | goto err3; |
879 | ||
880 | return sg; | |
881 | ||
882 | err3: | |
883 | sg_free_table(sg); | |
884 | err2: | |
885 | kfree(sg); | |
886 | err1: | |
887 | return ERR_PTR(-ENOMEM); | |
888 | } | |
889 | ||
890 | static void mbochs_unmap_dmabuf(struct dma_buf_attachment *at, | |
891 | struct sg_table *sg, | |
892 | enum dma_data_direction direction) | |
893 | { | |
894 | struct mbochs_dmabuf *dmabuf = at->dmabuf->priv; | |
895 | struct device *dev = mdev_dev(dmabuf->mdev_state->mdev); | |
896 | ||
897 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
898 | ||
be0704be | 899 | dma_unmap_sgtable(at->dev, sg, direction, 0); |
a5e6e650 GH |
900 | sg_free_table(sg); |
901 | kfree(sg); | |
902 | } | |
903 | ||
904 | static void mbochs_release_dmabuf(struct dma_buf *buf) | |
905 | { | |
906 | struct mbochs_dmabuf *dmabuf = buf->priv; | |
907 | struct mdev_state *mdev_state = dmabuf->mdev_state; | |
908 | struct device *dev = mdev_dev(mdev_state->mdev); | |
909 | pgoff_t pg; | |
910 | ||
911 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
912 | ||
913 | for (pg = 0; pg < dmabuf->pagecount; pg++) | |
914 | put_page(dmabuf->pages[pg]); | |
915 | ||
916 | mutex_lock(&mdev_state->ops_lock); | |
917 | dmabuf->buf = NULL; | |
918 | if (dmabuf->unlinked) | |
919 | kfree(dmabuf); | |
920 | mutex_unlock(&mdev_state->ops_lock); | |
921 | } | |
922 | ||
a5e6e650 GH |
923 | static struct dma_buf_ops mbochs_dmabuf_ops = { |
924 | .map_dma_buf = mbochs_map_dmabuf, | |
925 | .unmap_dma_buf = mbochs_unmap_dmabuf, | |
926 | .release = mbochs_release_dmabuf, | |
a5e6e650 GH |
927 | .mmap = mbochs_mmap_dmabuf, |
928 | }; | |
929 | ||
930 | static struct mbochs_dmabuf *mbochs_dmabuf_alloc(struct mdev_state *mdev_state, | |
931 | struct mbochs_mode *mode) | |
932 | { | |
933 | struct mbochs_dmabuf *dmabuf; | |
934 | pgoff_t page_offset, pg; | |
935 | ||
936 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
937 | ||
938 | dmabuf = kzalloc(sizeof(struct mbochs_dmabuf), GFP_KERNEL); | |
939 | if (!dmabuf) | |
940 | return NULL; | |
941 | ||
942 | dmabuf->mode = *mode; | |
943 | dmabuf->id = mdev_state->next_id++; | |
944 | dmabuf->pagecount = DIV_ROUND_UP(mode->size, PAGE_SIZE); | |
945 | dmabuf->pages = kcalloc(dmabuf->pagecount, sizeof(struct page *), | |
946 | GFP_KERNEL); | |
947 | if (!dmabuf->pages) | |
948 | goto err_free_dmabuf; | |
949 | ||
950 | page_offset = dmabuf->mode.offset >> PAGE_SHIFT; | |
951 | for (pg = 0; pg < dmabuf->pagecount; pg++) { | |
952 | dmabuf->pages[pg] = __mbochs_get_page(mdev_state, | |
953 | page_offset + pg); | |
954 | if (!dmabuf->pages[pg]) | |
955 | goto err_free_pages; | |
956 | } | |
957 | ||
958 | dmabuf->mdev_state = mdev_state; | |
959 | list_add(&dmabuf->next, &mdev_state->dmabufs); | |
960 | ||
961 | mbochs_print_dmabuf(dmabuf, __func__); | |
962 | return dmabuf; | |
963 | ||
964 | err_free_pages: | |
965 | while (pg > 0) | |
966 | put_page(dmabuf->pages[--pg]); | |
967 | kfree(dmabuf->pages); | |
968 | err_free_dmabuf: | |
969 | kfree(dmabuf); | |
970 | return NULL; | |
971 | } | |
972 | ||
973 | static struct mbochs_dmabuf * | |
974 | mbochs_dmabuf_find_by_mode(struct mdev_state *mdev_state, | |
975 | struct mbochs_mode *mode) | |
976 | { | |
977 | struct mbochs_dmabuf *dmabuf; | |
978 | ||
979 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
980 | ||
981 | list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) | |
982 | if (mbochs_modes_equal(&dmabuf->mode, mode)) | |
983 | return dmabuf; | |
984 | ||
985 | return NULL; | |
986 | } | |
987 | ||
988 | static struct mbochs_dmabuf * | |
989 | mbochs_dmabuf_find_by_id(struct mdev_state *mdev_state, u32 id) | |
990 | { | |
991 | struct mbochs_dmabuf *dmabuf; | |
992 | ||
993 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
994 | ||
995 | list_for_each_entry(dmabuf, &mdev_state->dmabufs, next) | |
996 | if (dmabuf->id == id) | |
997 | return dmabuf; | |
998 | ||
999 | return NULL; | |
1000 | } | |
1001 | ||
1002 | static int mbochs_dmabuf_export(struct mbochs_dmabuf *dmabuf) | |
1003 | { | |
1004 | struct mdev_state *mdev_state = dmabuf->mdev_state; | |
681c1615 | 1005 | struct device *dev = mdev_state->vdev.dev; |
a5e6e650 GH |
1006 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
1007 | struct dma_buf *buf; | |
1008 | ||
1009 | WARN_ON(!mutex_is_locked(&mdev_state->ops_lock)); | |
1010 | ||
1011 | if (!IS_ALIGNED(dmabuf->mode.offset, PAGE_SIZE)) { | |
1012 | dev_info_ratelimited(dev, "%s: framebuffer not page-aligned\n", | |
1013 | __func__); | |
1014 | return -EINVAL; | |
1015 | } | |
1016 | ||
1017 | exp_info.ops = &mbochs_dmabuf_ops; | |
1018 | exp_info.size = dmabuf->mode.size; | |
1019 | exp_info.priv = dmabuf; | |
1020 | ||
1021 | buf = dma_buf_export(&exp_info); | |
1022 | if (IS_ERR(buf)) { | |
1023 | dev_info_ratelimited(dev, "%s: dma_buf_export failed: %ld\n", | |
1024 | __func__, PTR_ERR(buf)); | |
1025 | return PTR_ERR(buf); | |
1026 | } | |
1027 | ||
1028 | dmabuf->buf = buf; | |
1029 | dev_dbg(dev, "%s: %d\n", __func__, dmabuf->id); | |
1030 | return 0; | |
1031 | } | |
1032 | ||
681c1615 | 1033 | static int mbochs_get_region_info(struct mdev_state *mdev_state, |
104c7405 | 1034 | struct vfio_region_info_ext *ext) |
a5e6e650 | 1035 | { |
104c7405 | 1036 | struct vfio_region_info *region_info = &ext->base; |
a5e6e650 | 1037 | |
104c7405 | 1038 | if (region_info->index >= MBOCHS_NUM_REGIONS) |
a5e6e650 GH |
1039 | return -EINVAL; |
1040 | ||
1041 | switch (region_info->index) { | |
1042 | case VFIO_PCI_CONFIG_REGION_INDEX: | |
1043 | region_info->offset = 0; | |
1044 | region_info->size = MBOCHS_CONFIG_SPACE_SIZE; | |
1045 | region_info->flags = (VFIO_REGION_INFO_FLAG_READ | | |
1046 | VFIO_REGION_INFO_FLAG_WRITE); | |
1047 | break; | |
1048 | case VFIO_PCI_BAR0_REGION_INDEX: | |
1049 | region_info->offset = MBOCHS_MEMORY_BAR_OFFSET; | |
1050 | region_info->size = mdev_state->memsize; | |
1051 | region_info->flags = (VFIO_REGION_INFO_FLAG_READ | | |
1052 | VFIO_REGION_INFO_FLAG_WRITE | | |
1053 | VFIO_REGION_INFO_FLAG_MMAP); | |
1054 | break; | |
1055 | case VFIO_PCI_BAR2_REGION_INDEX: | |
1056 | region_info->offset = MBOCHS_MMIO_BAR_OFFSET; | |
1057 | region_info->size = MBOCHS_MMIO_BAR_SIZE; | |
1058 | region_info->flags = (VFIO_REGION_INFO_FLAG_READ | | |
1059 | VFIO_REGION_INFO_FLAG_WRITE); | |
1060 | break; | |
104c7405 GH |
1061 | case MBOCHS_EDID_REGION_INDEX: |
1062 | ext->base.argsz = sizeof(*ext); | |
1063 | ext->base.offset = MBOCHS_EDID_OFFSET; | |
1064 | ext->base.size = MBOCHS_EDID_SIZE; | |
1065 | ext->base.flags = (VFIO_REGION_INFO_FLAG_READ | | |
1066 | VFIO_REGION_INFO_FLAG_WRITE | | |
1067 | VFIO_REGION_INFO_FLAG_CAPS); | |
1068 | ext->base.cap_offset = offsetof(typeof(*ext), type); | |
1069 | ext->type.header.id = VFIO_REGION_INFO_CAP_TYPE; | |
1070 | ext->type.header.version = 1; | |
1071 | ext->type.header.next = 0; | |
1072 | ext->type.type = VFIO_REGION_TYPE_GFX; | |
1073 | ext->type.subtype = VFIO_REGION_SUBTYPE_GFX_EDID; | |
1074 | break; | |
a5e6e650 GH |
1075 | default: |
1076 | region_info->size = 0; | |
1077 | region_info->offset = 0; | |
1078 | region_info->flags = 0; | |
1079 | } | |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | ||
681c1615 | 1084 | static int mbochs_get_irq_info(struct vfio_irq_info *irq_info) |
a5e6e650 GH |
1085 | { |
1086 | irq_info->count = 0; | |
1087 | return 0; | |
1088 | } | |
1089 | ||
681c1615 | 1090 | static int mbochs_get_device_info(struct vfio_device_info *dev_info) |
a5e6e650 GH |
1091 | { |
1092 | dev_info->flags = VFIO_DEVICE_FLAGS_PCI; | |
104c7405 | 1093 | dev_info->num_regions = MBOCHS_NUM_REGIONS; |
a5e6e650 GH |
1094 | dev_info->num_irqs = VFIO_PCI_NUM_IRQS; |
1095 | return 0; | |
1096 | } | |
1097 | ||
681c1615 | 1098 | static int mbochs_query_gfx_plane(struct mdev_state *mdev_state, |
a5e6e650 GH |
1099 | struct vfio_device_gfx_plane_info *plane) |
1100 | { | |
a5e6e650 GH |
1101 | struct mbochs_dmabuf *dmabuf; |
1102 | struct mbochs_mode mode; | |
1103 | int ret; | |
1104 | ||
1105 | if (plane->flags & VFIO_GFX_PLANE_TYPE_PROBE) { | |
1106 | if (plane->flags == (VFIO_GFX_PLANE_TYPE_PROBE | | |
1107 | VFIO_GFX_PLANE_TYPE_DMABUF)) | |
1108 | return 0; | |
1109 | return -EINVAL; | |
1110 | } | |
1111 | ||
1112 | if (plane->flags != VFIO_GFX_PLANE_TYPE_DMABUF) | |
1113 | return -EINVAL; | |
1114 | ||
1115 | plane->drm_format_mod = 0; | |
1116 | plane->x_pos = 0; | |
1117 | plane->y_pos = 0; | |
1118 | plane->x_hot = 0; | |
1119 | plane->y_hot = 0; | |
1120 | ||
1121 | mutex_lock(&mdev_state->ops_lock); | |
1122 | ||
1123 | ret = -EINVAL; | |
1124 | if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY) | |
1125 | ret = mbochs_check_framebuffer(mdev_state, &mode); | |
1126 | if (ret < 0) { | |
1127 | plane->drm_format = 0; | |
1128 | plane->width = 0; | |
1129 | plane->height = 0; | |
1130 | plane->stride = 0; | |
1131 | plane->size = 0; | |
1132 | plane->dmabuf_id = 0; | |
1133 | goto done; | |
1134 | } | |
1135 | ||
1136 | dmabuf = mbochs_dmabuf_find_by_mode(mdev_state, &mode); | |
1137 | if (!dmabuf) | |
1138 | mbochs_dmabuf_alloc(mdev_state, &mode); | |
1139 | if (!dmabuf) { | |
1140 | mutex_unlock(&mdev_state->ops_lock); | |
1141 | return -ENOMEM; | |
1142 | } | |
1143 | ||
1144 | plane->drm_format = dmabuf->mode.drm_format; | |
1145 | plane->width = dmabuf->mode.width; | |
1146 | plane->height = dmabuf->mode.height; | |
1147 | plane->stride = dmabuf->mode.stride; | |
1148 | plane->size = dmabuf->mode.size; | |
1149 | plane->dmabuf_id = dmabuf->id; | |
1150 | ||
1151 | done: | |
1152 | if (plane->drm_plane_type == DRM_PLANE_TYPE_PRIMARY && | |
1153 | mdev_state->active_id != plane->dmabuf_id) { | |
681c1615 JG |
1154 | dev_dbg(mdev_state->vdev.dev, "%s: primary: %d => %d\n", |
1155 | __func__, mdev_state->active_id, plane->dmabuf_id); | |
a5e6e650 GH |
1156 | mdev_state->active_id = plane->dmabuf_id; |
1157 | } | |
1158 | mutex_unlock(&mdev_state->ops_lock); | |
1159 | return 0; | |
1160 | } | |
1161 | ||
681c1615 | 1162 | static int mbochs_get_gfx_dmabuf(struct mdev_state *mdev_state, u32 id) |
a5e6e650 | 1163 | { |
a5e6e650 GH |
1164 | struct mbochs_dmabuf *dmabuf; |
1165 | ||
1166 | mutex_lock(&mdev_state->ops_lock); | |
1167 | ||
1168 | dmabuf = mbochs_dmabuf_find_by_id(mdev_state, id); | |
1169 | if (!dmabuf) { | |
1170 | mutex_unlock(&mdev_state->ops_lock); | |
1171 | return -ENOENT; | |
1172 | } | |
1173 | ||
1174 | if (!dmabuf->buf) | |
1175 | mbochs_dmabuf_export(dmabuf); | |
1176 | ||
1177 | mutex_unlock(&mdev_state->ops_lock); | |
1178 | ||
1179 | if (!dmabuf->buf) | |
1180 | return -EINVAL; | |
1181 | ||
1182 | return dma_buf_fd(dmabuf->buf, 0); | |
1183 | } | |
1184 | ||
681c1615 JG |
1185 | static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd, |
1186 | unsigned long arg) | |
a5e6e650 | 1187 | { |
681c1615 JG |
1188 | struct mdev_state *mdev_state = |
1189 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 | 1190 | int ret = 0; |
104c7405 | 1191 | unsigned long minsz, outsz; |
a5e6e650 GH |
1192 | |
1193 | switch (cmd) { | |
1194 | case VFIO_DEVICE_GET_INFO: | |
1195 | { | |
1196 | struct vfio_device_info info; | |
1197 | ||
1198 | minsz = offsetofend(struct vfio_device_info, num_irqs); | |
1199 | ||
1200 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1201 | return -EFAULT; | |
1202 | ||
1203 | if (info.argsz < minsz) | |
1204 | return -EINVAL; | |
1205 | ||
681c1615 | 1206 | ret = mbochs_get_device_info(&info); |
a5e6e650 GH |
1207 | if (ret) |
1208 | return ret; | |
1209 | ||
a5e6e650 GH |
1210 | if (copy_to_user((void __user *)arg, &info, minsz)) |
1211 | return -EFAULT; | |
1212 | ||
1213 | return 0; | |
1214 | } | |
1215 | case VFIO_DEVICE_GET_REGION_INFO: | |
1216 | { | |
104c7405 | 1217 | struct vfio_region_info_ext info; |
a5e6e650 | 1218 | |
104c7405 | 1219 | minsz = offsetofend(typeof(info), base.offset); |
a5e6e650 GH |
1220 | |
1221 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1222 | return -EFAULT; | |
1223 | ||
104c7405 GH |
1224 | outsz = info.base.argsz; |
1225 | if (outsz < minsz) | |
1226 | return -EINVAL; | |
1227 | if (outsz > sizeof(info)) | |
a5e6e650 GH |
1228 | return -EINVAL; |
1229 | ||
681c1615 | 1230 | ret = mbochs_get_region_info(mdev_state, &info); |
a5e6e650 GH |
1231 | if (ret) |
1232 | return ret; | |
1233 | ||
104c7405 | 1234 | if (copy_to_user((void __user *)arg, &info, outsz)) |
a5e6e650 GH |
1235 | return -EFAULT; |
1236 | ||
1237 | return 0; | |
1238 | } | |
1239 | ||
1240 | case VFIO_DEVICE_GET_IRQ_INFO: | |
1241 | { | |
1242 | struct vfio_irq_info info; | |
1243 | ||
1244 | minsz = offsetofend(struct vfio_irq_info, count); | |
1245 | ||
1246 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1247 | return -EFAULT; | |
1248 | ||
1249 | if ((info.argsz < minsz) || | |
104c7405 | 1250 | (info.index >= VFIO_PCI_NUM_IRQS)) |
a5e6e650 GH |
1251 | return -EINVAL; |
1252 | ||
681c1615 | 1253 | ret = mbochs_get_irq_info(&info); |
a5e6e650 GH |
1254 | if (ret) |
1255 | return ret; | |
1256 | ||
1257 | if (copy_to_user((void __user *)arg, &info, minsz)) | |
1258 | return -EFAULT; | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | case VFIO_DEVICE_QUERY_GFX_PLANE: | |
1264 | { | |
a7bea9f4 | 1265 | struct vfio_device_gfx_plane_info plane = {}; |
a5e6e650 GH |
1266 | |
1267 | minsz = offsetofend(struct vfio_device_gfx_plane_info, | |
1268 | region_index); | |
1269 | ||
1270 | if (copy_from_user(&plane, (void __user *)arg, minsz)) | |
1271 | return -EFAULT; | |
1272 | ||
1273 | if (plane.argsz < minsz) | |
1274 | return -EINVAL; | |
1275 | ||
681c1615 | 1276 | ret = mbochs_query_gfx_plane(mdev_state, &plane); |
a5e6e650 GH |
1277 | if (ret) |
1278 | return ret; | |
1279 | ||
1280 | if (copy_to_user((void __user *)arg, &plane, minsz)) | |
1281 | return -EFAULT; | |
1282 | ||
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | case VFIO_DEVICE_GET_GFX_DMABUF: | |
1287 | { | |
1288 | u32 dmabuf_id; | |
1289 | ||
1290 | if (get_user(dmabuf_id, (__u32 __user *)arg)) | |
1291 | return -EFAULT; | |
1292 | ||
681c1615 | 1293 | return mbochs_get_gfx_dmabuf(mdev_state, dmabuf_id); |
a5e6e650 GH |
1294 | } |
1295 | ||
1296 | case VFIO_DEVICE_SET_IRQS: | |
1297 | return -EINVAL; | |
1298 | ||
1299 | case VFIO_DEVICE_RESET: | |
681c1615 | 1300 | return mbochs_reset(mdev_state); |
a5e6e650 GH |
1301 | } |
1302 | return -ENOTTY; | |
1303 | } | |
1304 | ||
3cb24827 | 1305 | static void mbochs_close_device(struct vfio_device *vdev) |
a5e6e650 | 1306 | { |
681c1615 JG |
1307 | struct mdev_state *mdev_state = |
1308 | container_of(vdev, struct mdev_state, vdev); | |
a5e6e650 GH |
1309 | struct mbochs_dmabuf *dmabuf, *tmp; |
1310 | ||
1311 | mutex_lock(&mdev_state->ops_lock); | |
1312 | ||
1313 | list_for_each_entry_safe(dmabuf, tmp, &mdev_state->dmabufs, next) { | |
1314 | list_del(&dmabuf->next); | |
1315 | if (dmabuf->buf) { | |
1316 | /* free in mbochs_release_dmabuf() */ | |
1317 | dmabuf->unlinked = true; | |
1318 | } else { | |
1319 | kfree(dmabuf); | |
1320 | } | |
1321 | } | |
1322 | mbochs_put_pages(mdev_state); | |
1323 | ||
1324 | mutex_unlock(&mdev_state->ops_lock); | |
a5e6e650 GH |
1325 | } |
1326 | ||
1327 | static ssize_t | |
1328 | memory_show(struct device *dev, struct device_attribute *attr, | |
1329 | char *buf) | |
1330 | { | |
681c1615 | 1331 | struct mdev_state *mdev_state = dev_get_drvdata(dev); |
a5e6e650 GH |
1332 | |
1333 | return sprintf(buf, "%d MB\n", mdev_state->type->mbytes); | |
1334 | } | |
1335 | static DEVICE_ATTR_RO(memory); | |
1336 | ||
1337 | static struct attribute *mdev_dev_attrs[] = { | |
1338 | &dev_attr_memory.attr, | |
1339 | NULL, | |
1340 | }; | |
1341 | ||
1342 | static const struct attribute_group mdev_dev_group = { | |
1343 | .name = "vendor", | |
1344 | .attrs = mdev_dev_attrs, | |
1345 | }; | |
1346 | ||
6cbf507f | 1347 | static const struct attribute_group *mdev_dev_groups[] = { |
a5e6e650 GH |
1348 | &mdev_dev_group, |
1349 | NULL, | |
1350 | }; | |
1351 | ||
685a1537 | 1352 | static ssize_t mbochs_show_description(struct mdev_type *mtype, char *buf) |
a5e6e650 | 1353 | { |
da44c340 CH |
1354 | struct mbochs_type *type = |
1355 | container_of(mtype, struct mbochs_type, type); | |
a5e6e650 GH |
1356 | |
1357 | return sprintf(buf, "virtual display, %d MB video memory\n", | |
1358 | type ? type->mbytes : 0); | |
1359 | } | |
a5e6e650 | 1360 | |
f2fbc72e | 1361 | static unsigned int mbochs_get_available(struct mdev_type *mtype) |
a5e6e650 | 1362 | { |
da44c340 CH |
1363 | struct mbochs_type *type = |
1364 | container_of(mtype, struct mbochs_type, type); | |
a5e6e650 | 1365 | |
f2fbc72e | 1366 | return atomic_read(&mbochs_avail_mbytes) / type->mbytes; |
a5e6e650 | 1367 | } |
a5e6e650 | 1368 | |
681c1615 | 1369 | static const struct vfio_device_ops mbochs_dev_ops = { |
3cb24827 | 1370 | .close_device = mbochs_close_device, |
3d5d18e1 YL |
1371 | .init = mbochs_init_dev, |
1372 | .release = mbochs_release_dev, | |
681c1615 JG |
1373 | .read = mbochs_read, |
1374 | .write = mbochs_write, | |
1375 | .ioctl = mbochs_ioctl, | |
1376 | .mmap = mbochs_mmap, | |
0a782d15 YL |
1377 | .bind_iommufd = vfio_iommufd_emulated_bind, |
1378 | .unbind_iommufd = vfio_iommufd_emulated_unbind, | |
1379 | .attach_ioas = vfio_iommufd_emulated_attach_ioas, | |
8cfa7186 | 1380 | .detach_ioas = vfio_iommufd_emulated_detach_ioas, |
681c1615 JG |
1381 | }; |
1382 | ||
1383 | static struct mdev_driver mbochs_driver = { | |
290aac5d | 1384 | .device_api = VFIO_DEVICE_API_PCI_STRING, |
681c1615 JG |
1385 | .driver = { |
1386 | .name = "mbochs", | |
1387 | .owner = THIS_MODULE, | |
1388 | .mod_name = KBUILD_MODNAME, | |
1389 | .dev_groups = mdev_dev_groups, | |
1390 | }, | |
1391 | .probe = mbochs_probe, | |
1392 | .remove = mbochs_remove, | |
f2fbc72e | 1393 | .get_available = mbochs_get_available, |
685a1537 | 1394 | .show_description = mbochs_show_description, |
a5e6e650 GH |
1395 | }; |
1396 | ||
1397 | static const struct file_operations vd_fops = { | |
1398 | .owner = THIS_MODULE, | |
1399 | }; | |
1400 | ||
1401 | static void mbochs_device_release(struct device *dev) | |
1402 | { | |
1403 | /* nothing */ | |
1404 | } | |
1405 | ||
1406 | static int __init mbochs_dev_init(void) | |
1407 | { | |
1408 | int ret = 0; | |
1409 | ||
de5494af JG |
1410 | atomic_set(&mbochs_avail_mbytes, max_mbytes); |
1411 | ||
16355214 | 1412 | ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME); |
a5e6e650 GH |
1413 | if (ret < 0) { |
1414 | pr_err("Error: failed to register mbochs_dev, err: %d\n", ret); | |
1415 | return ret; | |
1416 | } | |
1417 | cdev_init(&mbochs_cdev, &vd_fops); | |
16355214 | 1418 | cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1); |
a5e6e650 GH |
1419 | pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt)); |
1420 | ||
681c1615 JG |
1421 | ret = mdev_register_driver(&mbochs_driver); |
1422 | if (ret) | |
1423 | goto err_cdev; | |
1424 | ||
1aaba11d | 1425 | mbochs_class = class_create(MBOCHS_CLASS_NAME); |
a5e6e650 GH |
1426 | if (IS_ERR(mbochs_class)) { |
1427 | pr_err("Error: failed to register mbochs_dev class\n"); | |
1428 | ret = PTR_ERR(mbochs_class); | |
681c1615 | 1429 | goto err_driver; |
a5e6e650 GH |
1430 | } |
1431 | mbochs_dev.class = mbochs_class; | |
1432 | mbochs_dev.release = mbochs_device_release; | |
1433 | dev_set_name(&mbochs_dev, "%s", MBOCHS_NAME); | |
1434 | ||
1435 | ret = device_register(&mbochs_dev); | |
1436 | if (ret) | |
ce389573 | 1437 | goto err_put; |
a5e6e650 | 1438 | |
da44c340 CH |
1439 | ret = mdev_register_parent(&mbochs_parent, &mbochs_dev, &mbochs_driver, |
1440 | mbochs_mdev_types, | |
1441 | ARRAY_SIZE(mbochs_mdev_types)); | |
a5e6e650 | 1442 | if (ret) |
681c1615 | 1443 | goto err_device; |
a5e6e650 GH |
1444 | |
1445 | return 0; | |
1446 | ||
681c1615 | 1447 | err_device: |
ce389573 AW |
1448 | device_del(&mbochs_dev); |
1449 | err_put: | |
1450 | put_device(&mbochs_dev); | |
a5e6e650 | 1451 | class_destroy(mbochs_class); |
681c1615 JG |
1452 | err_driver: |
1453 | mdev_unregister_driver(&mbochs_driver); | |
1454 | err_cdev: | |
a5e6e650 | 1455 | cdev_del(&mbochs_cdev); |
16355214 | 1456 | unregister_chrdev_region(mbochs_devt, MINORMASK + 1); |
a5e6e650 GH |
1457 | return ret; |
1458 | } | |
1459 | ||
1460 | static void __exit mbochs_dev_exit(void) | |
1461 | { | |
1462 | mbochs_dev.bus = NULL; | |
89345d51 | 1463 | mdev_unregister_parent(&mbochs_parent); |
a5e6e650 GH |
1464 | |
1465 | device_unregister(&mbochs_dev); | |
681c1615 | 1466 | mdev_unregister_driver(&mbochs_driver); |
a5e6e650 | 1467 | cdev_del(&mbochs_cdev); |
16355214 | 1468 | unregister_chrdev_region(mbochs_devt, MINORMASK + 1); |
a5e6e650 GH |
1469 | class_destroy(mbochs_class); |
1470 | mbochs_class = NULL; | |
1471 | } | |
1472 | ||
16b0314a | 1473 | MODULE_IMPORT_NS(DMA_BUF); |
a5e6e650 GH |
1474 | module_init(mbochs_dev_init) |
1475 | module_exit(mbochs_dev_exit) |