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15#include <linux/device.h>
16#include <linux/iommu.h>
17#include <linux/module.h>
18#include <linux/mutex.h>
19#include <linux/slab.h>
20#include <linux/types.h>
21#include <linux/uaccess.h>
22#include <linux/vfio.h>
23
24#include "vfio_platform_private.h"
25
26static DEFINE_MUTEX(driver_lock);
27
28static const struct vfio_platform_reset_combo reset_lookup_table[] = {
29 {
30 .compat = "calxeda,hb-xgmac",
31 .reset_function_name = "vfio_platform_calxedaxgmac_reset",
32 .module_name = "vfio-platform-calxedaxgmac",
33 },
34};
35
36static void vfio_platform_get_reset(struct vfio_platform_device *vdev,
37 struct device *dev)
38{
39 const char *compat;
40 int (*reset)(struct vfio_platform_device *);
41 int ret, i;
42
43 ret = device_property_read_string(dev, "compatible", &compat);
44 if (ret)
45 return;
46
47 for (i = 0 ; i < ARRAY_SIZE(reset_lookup_table); i++) {
48 if (!strcmp(reset_lookup_table[i].compat, compat)) {
49 request_module(reset_lookup_table[i].module_name);
50 reset = __symbol_get(
51 reset_lookup_table[i].reset_function_name);
52 if (reset) {
53 vdev->reset = reset;
54 return;
55 }
56 }
57 }
58}
59
60static void vfio_platform_put_reset(struct vfio_platform_device *vdev)
61{
62 if (vdev->reset)
63 symbol_put_addr(vdev->reset);
64}
65
66static int vfio_platform_regions_init(struct vfio_platform_device *vdev)
67{
68 int cnt = 0, i;
69
70 while (vdev->get_resource(vdev, cnt))
71 cnt++;
72
73 vdev->regions = kcalloc(cnt, sizeof(struct vfio_platform_region),
74 GFP_KERNEL);
75 if (!vdev->regions)
76 return -ENOMEM;
77
78 for (i = 0; i < cnt; i++) {
79 struct resource *res =
80 vdev->get_resource(vdev, i);
81
82 if (!res)
83 goto err;
84
85 vdev->regions[i].addr = res->start;
86 vdev->regions[i].size = resource_size(res);
87 vdev->regions[i].flags = 0;
88
89 switch (resource_type(res)) {
90 case IORESOURCE_MEM:
91 vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO;
92 vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
93 if (!(res->flags & IORESOURCE_READONLY))
94 vdev->regions[i].flags |=
95 VFIO_REGION_INFO_FLAG_WRITE;
96
97
98
99
100
101 if (!(vdev->regions[i].addr & ~PAGE_MASK) &&
102 !(vdev->regions[i].size & ~PAGE_MASK))
103 vdev->regions[i].flags |=
104 VFIO_REGION_INFO_FLAG_MMAP;
105
106 break;
107 case IORESOURCE_IO:
108 vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO;
109 break;
110 default:
111 goto err;
112 }
113 }
114
115 vdev->num_regions = cnt;
116
117 return 0;
118err:
119 kfree(vdev->regions);
120 return -EINVAL;
121}
122
123static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev)
124{
125 int i;
126
127 for (i = 0; i < vdev->num_regions; i++)
128 iounmap(vdev->regions[i].ioaddr);
129
130 vdev->num_regions = 0;
131 kfree(vdev->regions);
132}
133
134static void vfio_platform_release(void *device_data)
135{
136 struct vfio_platform_device *vdev = device_data;
137
138 mutex_lock(&driver_lock);
139
140 if (!(--vdev->refcnt)) {
141 if (vdev->reset)
142 vdev->reset(vdev);
143 vfio_platform_regions_cleanup(vdev);
144 vfio_platform_irq_cleanup(vdev);
145 }
146
147 mutex_unlock(&driver_lock);
148
149 module_put(THIS_MODULE);
150}
151
152static int vfio_platform_open(void *device_data)
153{
154 struct vfio_platform_device *vdev = device_data;
155 int ret;
156
157 if (!try_module_get(THIS_MODULE))
158 return -ENODEV;
159
160 mutex_lock(&driver_lock);
161
162 if (!vdev->refcnt) {
163 ret = vfio_platform_regions_init(vdev);
164 if (ret)
165 goto err_reg;
166
167 ret = vfio_platform_irq_init(vdev);
168 if (ret)
169 goto err_irq;
170
171 if (vdev->reset)
172 vdev->reset(vdev);
173 }
174
175 vdev->refcnt++;
176
177 mutex_unlock(&driver_lock);
178 return 0;
179
180err_irq:
181 vfio_platform_regions_cleanup(vdev);
182err_reg:
183 mutex_unlock(&driver_lock);
184 module_put(THIS_MODULE);
185 return ret;
186}
187
188static long vfio_platform_ioctl(void *device_data,
189 unsigned int cmd, unsigned long arg)
190{
191 struct vfio_platform_device *vdev = device_data;
192 unsigned long minsz;
193
194 if (cmd == VFIO_DEVICE_GET_INFO) {
195 struct vfio_device_info info;
196
197 minsz = offsetofend(struct vfio_device_info, num_irqs);
198
199 if (copy_from_user(&info, (void __user *)arg, minsz))
200 return -EFAULT;
201
202 if (info.argsz < minsz)
203 return -EINVAL;
204
205 if (vdev->reset)
206 vdev->flags |= VFIO_DEVICE_FLAGS_RESET;
207 info.flags = vdev->flags;
208 info.num_regions = vdev->num_regions;
209 info.num_irqs = vdev->num_irqs;
210
211 return copy_to_user((void __user *)arg, &info, minsz);
212
213 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
214 struct vfio_region_info info;
215
216 minsz = offsetofend(struct vfio_region_info, offset);
217
218 if (copy_from_user(&info, (void __user *)arg, minsz))
219 return -EFAULT;
220
221 if (info.argsz < minsz)
222 return -EINVAL;
223
224 if (info.index >= vdev->num_regions)
225 return -EINVAL;
226
227
228 info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index);
229 info.size = vdev->regions[info.index].size;
230 info.flags = vdev->regions[info.index].flags;
231
232 return copy_to_user((void __user *)arg, &info, minsz);
233
234 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
235 struct vfio_irq_info info;
236
237 minsz = offsetofend(struct vfio_irq_info, count);
238
239 if (copy_from_user(&info, (void __user *)arg, minsz))
240 return -EFAULT;
241
242 if (info.argsz < minsz)
243 return -EINVAL;
244
245 if (info.index >= vdev->num_irqs)
246 return -EINVAL;
247
248 info.flags = vdev->irqs[info.index].flags;
249 info.count = vdev->irqs[info.index].count;
250
251 return copy_to_user((void __user *)arg, &info, minsz);
252
253 } else if (cmd == VFIO_DEVICE_SET_IRQS) {
254 struct vfio_irq_set hdr;
255 u8 *data = NULL;
256 int ret = 0;
257
258 minsz = offsetofend(struct vfio_irq_set, count);
259
260 if (copy_from_user(&hdr, (void __user *)arg, minsz))
261 return -EFAULT;
262
263 if (hdr.argsz < minsz)
264 return -EINVAL;
265
266 if (hdr.index >= vdev->num_irqs)
267 return -EINVAL;
268
269 if (hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
270 VFIO_IRQ_SET_ACTION_TYPE_MASK))
271 return -EINVAL;
272
273 if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
274 size_t size;
275
276 if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
277 size = sizeof(uint8_t);
278 else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
279 size = sizeof(int32_t);
280 else
281 return -EINVAL;
282
283 if (hdr.argsz - minsz < size)
284 return -EINVAL;
285
286 data = memdup_user((void __user *)(arg + minsz), size);
287 if (IS_ERR(data))
288 return PTR_ERR(data);
289 }
290
291 mutex_lock(&vdev->igate);
292
293 ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
294 hdr.start, hdr.count, data);
295 mutex_unlock(&vdev->igate);
296 kfree(data);
297
298 return ret;
299
300 } else if (cmd == VFIO_DEVICE_RESET) {
301 if (vdev->reset)
302 return vdev->reset(vdev);
303 else
304 return -EINVAL;
305 }
306
307 return -ENOTTY;
308}
309
310static ssize_t vfio_platform_read_mmio(struct vfio_platform_region reg,
311 char __user *buf, size_t count,
312 loff_t off)
313{
314 unsigned int done = 0;
315
316 if (!reg.ioaddr) {
317 reg.ioaddr =
318 ioremap_nocache(reg.addr, reg.size);
319
320 if (!reg.ioaddr)
321 return -ENOMEM;
322 }
323
324 while (count) {
325 size_t filled;
326
327 if (count >= 4 && !(off % 4)) {
328 u32 val;
329
330 val = ioread32(reg.ioaddr + off);
331 if (copy_to_user(buf, &val, 4))
332 goto err;
333
334 filled = 4;
335 } else if (count >= 2 && !(off % 2)) {
336 u16 val;
337
338 val = ioread16(reg.ioaddr + off);
339 if (copy_to_user(buf, &val, 2))
340 goto err;
341
342 filled = 2;
343 } else {
344 u8 val;
345
346 val = ioread8(reg.ioaddr + off);
347 if (copy_to_user(buf, &val, 1))
348 goto err;
349
350 filled = 1;
351 }
352
353
354 count -= filled;
355 done += filled;
356 off += filled;
357 buf += filled;
358 }
359
360 return done;
361err:
362 return -EFAULT;
363}
364
365static ssize_t vfio_platform_read(void *device_data, char __user *buf,
366 size_t count, loff_t *ppos)
367{
368 struct vfio_platform_device *vdev = device_data;
369 unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
370 loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
371
372 if (index >= vdev->num_regions)
373 return -EINVAL;
374
375 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ))
376 return -EINVAL;
377
378 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
379 return vfio_platform_read_mmio(vdev->regions[index],
380 buf, count, off);
381 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
382 return -EINVAL;
383
384 return -EINVAL;
385}
386
387static ssize_t vfio_platform_write_mmio(struct vfio_platform_region reg,
388 const char __user *buf, size_t count,
389 loff_t off)
390{
391 unsigned int done = 0;
392
393 if (!reg.ioaddr) {
394 reg.ioaddr =
395 ioremap_nocache(reg.addr, reg.size);
396
397 if (!reg.ioaddr)
398 return -ENOMEM;
399 }
400
401 while (count) {
402 size_t filled;
403
404 if (count >= 4 && !(off % 4)) {
405 u32 val;
406
407 if (copy_from_user(&val, buf, 4))
408 goto err;
409 iowrite32(val, reg.ioaddr + off);
410
411 filled = 4;
412 } else if (count >= 2 && !(off % 2)) {
413 u16 val;
414
415 if (copy_from_user(&val, buf, 2))
416 goto err;
417 iowrite16(val, reg.ioaddr + off);
418
419 filled = 2;
420 } else {
421 u8 val;
422
423 if (copy_from_user(&val, buf, 1))
424 goto err;
425 iowrite8(val, reg.ioaddr + off);
426
427 filled = 1;
428 }
429
430 count -= filled;
431 done += filled;
432 off += filled;
433 buf += filled;
434 }
435
436 return done;
437err:
438 return -EFAULT;
439}
440
441static ssize_t vfio_platform_write(void *device_data, const char __user *buf,
442 size_t count, loff_t *ppos)
443{
444 struct vfio_platform_device *vdev = device_data;
445 unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
446 loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
447
448 if (index >= vdev->num_regions)
449 return -EINVAL;
450
451 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE))
452 return -EINVAL;
453
454 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
455 return vfio_platform_write_mmio(vdev->regions[index],
456 buf, count, off);
457 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
458 return -EINVAL;
459
460 return -EINVAL;
461}
462
463static int vfio_platform_mmap_mmio(struct vfio_platform_region region,
464 struct vm_area_struct *vma)
465{
466 u64 req_len, pgoff, req_start;
467
468 req_len = vma->vm_end - vma->vm_start;
469 pgoff = vma->vm_pgoff &
470 ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
471 req_start = pgoff << PAGE_SHIFT;
472
473 if (region.size < PAGE_SIZE || req_start + req_len > region.size)
474 return -EINVAL;
475
476 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
477 vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
478
479 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
480 req_len, vma->vm_page_prot);
481}
482
483static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma)
484{
485 struct vfio_platform_device *vdev = device_data;
486 unsigned int index;
487
488 index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT);
489
490 if (vma->vm_end < vma->vm_start)
491 return -EINVAL;
492 if (!(vma->vm_flags & VM_SHARED))
493 return -EINVAL;
494 if (index >= vdev->num_regions)
495 return -EINVAL;
496 if (vma->vm_start & ~PAGE_MASK)
497 return -EINVAL;
498 if (vma->vm_end & ~PAGE_MASK)
499 return -EINVAL;
500
501 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
502 return -EINVAL;
503
504 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)
505 && (vma->vm_flags & VM_READ))
506 return -EINVAL;
507
508 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)
509 && (vma->vm_flags & VM_WRITE))
510 return -EINVAL;
511
512 vma->vm_private_data = vdev;
513
514 if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
515 return vfio_platform_mmap_mmio(vdev->regions[index], vma);
516
517 else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
518 return -EINVAL;
519
520 return -EINVAL;
521}
522
523static const struct vfio_device_ops vfio_platform_ops = {
524 .name = "vfio-platform",
525 .open = vfio_platform_open,
526 .release = vfio_platform_release,
527 .ioctl = vfio_platform_ioctl,
528 .read = vfio_platform_read,
529 .write = vfio_platform_write,
530 .mmap = vfio_platform_mmap,
531};
532
533int vfio_platform_probe_common(struct vfio_platform_device *vdev,
534 struct device *dev)
535{
536 struct iommu_group *group;
537 int ret;
538
539 if (!vdev)
540 return -EINVAL;
541
542 group = iommu_group_get(dev);
543 if (!group) {
544 pr_err("VFIO: No IOMMU group for device %s\n", vdev->name);
545 return -EINVAL;
546 }
547
548 ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev);
549 if (ret) {
550 iommu_group_put(group);
551 return ret;
552 }
553
554 vfio_platform_get_reset(vdev, dev);
555
556 mutex_init(&vdev->igate);
557
558 return 0;
559}
560EXPORT_SYMBOL_GPL(vfio_platform_probe_common);
561
562struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
563{
564 struct vfio_platform_device *vdev;
565
566 vdev = vfio_del_group_dev(dev);
567
568 if (vdev) {
569 vfio_platform_put_reset(vdev);
570 iommu_group_put(dev->iommu_group);
571 }
572
573 return vdev;
574}
575EXPORT_SYMBOL_GPL(vfio_platform_remove_common);
576
