1
2#include <linux/compat.h>
3#include <linux/dma-mapping.h>
4#include <linux/iommu.h>
5#include <linux/module.h>
6#include <linux/poll.h>
7#include <linux/slab.h>
8#include <linux/uacce.h>
9
10static struct class *uacce_class;
11static dev_t uacce_devt;
12static DEFINE_MUTEX(uacce_mutex);
13static DEFINE_XARRAY_ALLOC(uacce_xa);
14
15static int uacce_start_queue(struct uacce_queue *q)
16{
17 int ret = 0;
18
19 mutex_lock(&uacce_mutex);
20
21 if (q->state != UACCE_Q_INIT) {
22 ret = -EINVAL;
23 goto out_with_lock;
24 }
25
26 if (q->uacce->ops->start_queue) {
27 ret = q->uacce->ops->start_queue(q);
28 if (ret < 0)
29 goto out_with_lock;
30 }
31
32 q->state = UACCE_Q_STARTED;
33
34out_with_lock:
35 mutex_unlock(&uacce_mutex);
36
37 return ret;
38}
39
40static int uacce_put_queue(struct uacce_queue *q)
41{
42 struct uacce_device *uacce = q->uacce;
43
44 mutex_lock(&uacce_mutex);
45
46 if (q->state == UACCE_Q_ZOMBIE)
47 goto out;
48
49 if ((q->state == UACCE_Q_STARTED) && uacce->ops->stop_queue)
50 uacce->ops->stop_queue(q);
51
52 if ((q->state == UACCE_Q_INIT || q->state == UACCE_Q_STARTED) &&
53 uacce->ops->put_queue)
54 uacce->ops->put_queue(q);
55
56 q->state = UACCE_Q_ZOMBIE;
57out:
58 mutex_unlock(&uacce_mutex);
59
60 return 0;
61}
62
63static long uacce_fops_unl_ioctl(struct file *filep,
64 unsigned int cmd, unsigned long arg)
65{
66 struct uacce_queue *q = filep->private_data;
67 struct uacce_device *uacce = q->uacce;
68
69 switch (cmd) {
70 case UACCE_CMD_START_Q:
71 return uacce_start_queue(q);
72
73 case UACCE_CMD_PUT_Q:
74 return uacce_put_queue(q);
75
76 default:
77 if (!uacce->ops->ioctl)
78 return -EINVAL;
79
80 return uacce->ops->ioctl(q, cmd, arg);
81 }
82}
83
84#ifdef CONFIG_COMPAT
85static long uacce_fops_compat_ioctl(struct file *filep,
86 unsigned int cmd, unsigned long arg)
87{
88 arg = (unsigned long)compat_ptr(arg);
89
90 return uacce_fops_unl_ioctl(filep, cmd, arg);
91}
92#endif
93
94static int uacce_bind_queue(struct uacce_device *uacce, struct uacce_queue *q)
95{
96 u32 pasid;
97 struct iommu_sva *handle;
98
99 if (!(uacce->flags & UACCE_DEV_SVA))
100 return 0;
101
102 handle = iommu_sva_bind_device(uacce->parent, current->mm, NULL);
103 if (IS_ERR(handle))
104 return PTR_ERR(handle);
105
106 pasid = iommu_sva_get_pasid(handle);
107 if (pasid == IOMMU_PASID_INVALID) {
108 iommu_sva_unbind_device(handle);
109 return -ENODEV;
110 }
111
112 q->handle = handle;
113 q->pasid = pasid;
114 return 0;
115}
116
117static void uacce_unbind_queue(struct uacce_queue *q)
118{
119 if (!q->handle)
120 return;
121 iommu_sva_unbind_device(q->handle);
122 q->handle = NULL;
123}
124
125static int uacce_fops_open(struct inode *inode, struct file *filep)
126{
127 struct uacce_device *uacce;
128 struct uacce_queue *q;
129 int ret;
130
131 uacce = xa_load(&uacce_xa, iminor(inode));
132 if (!uacce)
133 return -ENODEV;
134
135 q = kzalloc(sizeof(struct uacce_queue), GFP_KERNEL);
136 if (!q)
137 return -ENOMEM;
138
139 ret = uacce_bind_queue(uacce, q);
140 if (ret)
141 goto out_with_mem;
142
143 q->uacce = uacce;
144
145 if (uacce->ops->get_queue) {
146 ret = uacce->ops->get_queue(uacce, q->pasid, q);
147 if (ret < 0)
148 goto out_with_bond;
149 }
150
151 init_waitqueue_head(&q->wait);
152 filep->private_data = q;
153 uacce->inode = inode;
154 q->state = UACCE_Q_INIT;
155
156 mutex_lock(&uacce->queues_lock);
157 list_add(&q->list, &uacce->queues);
158 mutex_unlock(&uacce->queues_lock);
159
160 return 0;
161
162out_with_bond:
163 uacce_unbind_queue(q);
164out_with_mem:
165 kfree(q);
166 return ret;
167}
168
169static int uacce_fops_release(struct inode *inode, struct file *filep)
170{
171 struct uacce_queue *q = filep->private_data;
172
173 mutex_lock(&q->uacce->queues_lock);
174 list_del(&q->list);
175 mutex_unlock(&q->uacce->queues_lock);
176 uacce_put_queue(q);
177 uacce_unbind_queue(q);
178 kfree(q);
179
180 return 0;
181}
182
183static void uacce_vma_close(struct vm_area_struct *vma)
184{
185 struct uacce_queue *q = vma->vm_private_data;
186 struct uacce_qfile_region *qfr = NULL;
187
188 if (vma->vm_pgoff < UACCE_MAX_REGION)
189 qfr = q->qfrs[vma->vm_pgoff];
190
191 kfree(qfr);
192}
193
194static const struct vm_operations_struct uacce_vm_ops = {
195 .close = uacce_vma_close,
196};
197
198static int uacce_fops_mmap(struct file *filep, struct vm_area_struct *vma)
199{
200 struct uacce_queue *q = filep->private_data;
201 struct uacce_device *uacce = q->uacce;
202 struct uacce_qfile_region *qfr;
203 enum uacce_qfrt type = UACCE_MAX_REGION;
204 int ret = 0;
205
206 if (vma->vm_pgoff < UACCE_MAX_REGION)
207 type = vma->vm_pgoff;
208 else
209 return -EINVAL;
210
211 qfr = kzalloc(sizeof(*qfr), GFP_KERNEL);
212 if (!qfr)
213 return -ENOMEM;
214
215 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND | VM_WIPEONFORK;
216 vma->vm_ops = &uacce_vm_ops;
217 vma->vm_private_data = q;
218 qfr->type = type;
219
220 mutex_lock(&uacce_mutex);
221
222 if (q->state != UACCE_Q_INIT && q->state != UACCE_Q_STARTED) {
223 ret = -EINVAL;
224 goto out_with_lock;
225 }
226
227 if (q->qfrs[type]) {
228 ret = -EEXIST;
229 goto out_with_lock;
230 }
231
232 switch (type) {
233 case UACCE_QFRT_MMIO:
234 case UACCE_QFRT_DUS:
235 if (!uacce->ops->mmap) {
236 ret = -EINVAL;
237 goto out_with_lock;
238 }
239
240 ret = uacce->ops->mmap(q, vma, qfr);
241 if (ret)
242 goto out_with_lock;
243 break;
244
245 default:
246 ret = -EINVAL;
247 goto out_with_lock;
248 }
249
250 q->qfrs[type] = qfr;
251 mutex_unlock(&uacce_mutex);
252
253 return ret;
254
255out_with_lock:
256 mutex_unlock(&uacce_mutex);
257 kfree(qfr);
258 return ret;
259}
260
261static __poll_t uacce_fops_poll(struct file *file, poll_table *wait)
262{
263 struct uacce_queue *q = file->private_data;
264 struct uacce_device *uacce = q->uacce;
265
266 poll_wait(file, &q->wait, wait);
267 if (uacce->ops->is_q_updated && uacce->ops->is_q_updated(q))
268 return EPOLLIN | EPOLLRDNORM;
269
270 return 0;
271}
272
273static const struct file_operations uacce_fops = {
274 .owner = THIS_MODULE,
275 .open = uacce_fops_open,
276 .release = uacce_fops_release,
277 .unlocked_ioctl = uacce_fops_unl_ioctl,
278#ifdef CONFIG_COMPAT
279 .compat_ioctl = uacce_fops_compat_ioctl,
280#endif
281 .mmap = uacce_fops_mmap,
282 .poll = uacce_fops_poll,
283};
284
285#define to_uacce_device(dev) container_of(dev, struct uacce_device, dev)
286
287static ssize_t api_show(struct device *dev,
288 struct device_attribute *attr, char *buf)
289{
290 struct uacce_device *uacce = to_uacce_device(dev);
291
292 return sprintf(buf, "%s\n", uacce->api_ver);
293}
294
295static ssize_t flags_show(struct device *dev,
296 struct device_attribute *attr, char *buf)
297{
298 struct uacce_device *uacce = to_uacce_device(dev);
299
300 return sprintf(buf, "%u\n", uacce->flags);
301}
302
303static ssize_t available_instances_show(struct device *dev,
304 struct device_attribute *attr,
305 char *buf)
306{
307 struct uacce_device *uacce = to_uacce_device(dev);
308
309 if (!uacce->ops->get_available_instances)
310 return -ENODEV;
311
312 return sprintf(buf, "%d\n",
313 uacce->ops->get_available_instances(uacce));
314}
315
316static ssize_t algorithms_show(struct device *dev,
317 struct device_attribute *attr, char *buf)
318{
319 struct uacce_device *uacce = to_uacce_device(dev);
320
321 return sprintf(buf, "%s\n", uacce->algs);
322}
323
324static ssize_t region_mmio_size_show(struct device *dev,
325 struct device_attribute *attr, char *buf)
326{
327 struct uacce_device *uacce = to_uacce_device(dev);
328
329 return sprintf(buf, "%lu\n",
330 uacce->qf_pg_num[UACCE_QFRT_MMIO] << PAGE_SHIFT);
331}
332
333static ssize_t region_dus_size_show(struct device *dev,
334 struct device_attribute *attr, char *buf)
335{
336 struct uacce_device *uacce = to_uacce_device(dev);
337
338 return sprintf(buf, "%lu\n",
339 uacce->qf_pg_num[UACCE_QFRT_DUS] << PAGE_SHIFT);
340}
341
342static DEVICE_ATTR_RO(api);
343static DEVICE_ATTR_RO(flags);
344static DEVICE_ATTR_RO(available_instances);
345static DEVICE_ATTR_RO(algorithms);
346static DEVICE_ATTR_RO(region_mmio_size);
347static DEVICE_ATTR_RO(region_dus_size);
348
349static struct attribute *uacce_dev_attrs[] = {
350 &dev_attr_api.attr,
351 &dev_attr_flags.attr,
352 &dev_attr_available_instances.attr,
353 &dev_attr_algorithms.attr,
354 &dev_attr_region_mmio_size.attr,
355 &dev_attr_region_dus_size.attr,
356 NULL,
357};
358
359static umode_t uacce_dev_is_visible(struct kobject *kobj,
360 struct attribute *attr, int n)
361{
362 struct device *dev = kobj_to_dev(kobj);
363 struct uacce_device *uacce = to_uacce_device(dev);
364
365 if (((attr == &dev_attr_region_mmio_size.attr) &&
366 (!uacce->qf_pg_num[UACCE_QFRT_MMIO])) ||
367 ((attr == &dev_attr_region_dus_size.attr) &&
368 (!uacce->qf_pg_num[UACCE_QFRT_DUS])))
369 return 0;
370
371 return attr->mode;
372}
373
374static struct attribute_group uacce_dev_group = {
375 .is_visible = uacce_dev_is_visible,
376 .attrs = uacce_dev_attrs,
377};
378
379__ATTRIBUTE_GROUPS(uacce_dev);
380
381static void uacce_release(struct device *dev)
382{
383 struct uacce_device *uacce = to_uacce_device(dev);
384
385 kfree(uacce);
386}
387
388static unsigned int uacce_enable_sva(struct device *parent, unsigned int flags)
389{
390 int ret;
391
392 if (!(flags & UACCE_DEV_SVA))
393 return flags;
394
395 flags &= ~UACCE_DEV_SVA;
396
397 ret = iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_IOPF);
398 if (ret) {
399 dev_err(parent, "failed to enable IOPF feature! ret = %pe\n", ERR_PTR(ret));
400 return flags;
401 }
402
403 ret = iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_SVA);
404 if (ret) {
405 dev_err(parent, "failed to enable SVA feature! ret = %pe\n", ERR_PTR(ret));
406 iommu_dev_disable_feature(parent, IOMMU_DEV_FEAT_IOPF);
407 return flags;
408 }
409
410 return flags | UACCE_DEV_SVA;
411}
412
413static void uacce_disable_sva(struct uacce_device *uacce)
414{
415 if (!(uacce->flags & UACCE_DEV_SVA))
416 return;
417
418 iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_SVA);
419 iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_IOPF);
420}
421
422
423
424
425
426
427
428
429
430struct uacce_device *uacce_alloc(struct device *parent,
431 struct uacce_interface *interface)
432{
433 unsigned int flags = interface->flags;
434 struct uacce_device *uacce;
435 int ret;
436
437 uacce = kzalloc(sizeof(struct uacce_device), GFP_KERNEL);
438 if (!uacce)
439 return ERR_PTR(-ENOMEM);
440
441 flags = uacce_enable_sva(parent, flags);
442
443 uacce->parent = parent;
444 uacce->flags = flags;
445 uacce->ops = interface->ops;
446
447 ret = xa_alloc(&uacce_xa, &uacce->dev_id, uacce, xa_limit_32b,
448 GFP_KERNEL);
449 if (ret < 0)
450 goto err_with_uacce;
451
452 INIT_LIST_HEAD(&uacce->queues);
453 mutex_init(&uacce->queues_lock);
454 device_initialize(&uacce->dev);
455 uacce->dev.devt = MKDEV(MAJOR(uacce_devt), uacce->dev_id);
456 uacce->dev.class = uacce_class;
457 uacce->dev.groups = uacce_dev_groups;
458 uacce->dev.parent = uacce->parent;
459 uacce->dev.release = uacce_release;
460 dev_set_name(&uacce->dev, "%s-%d", interface->name, uacce->dev_id);
461
462 return uacce;
463
464err_with_uacce:
465 uacce_disable_sva(uacce);
466 kfree(uacce);
467 return ERR_PTR(ret);
468}
469EXPORT_SYMBOL_GPL(uacce_alloc);
470
471
472
473
474
475
476
477int uacce_register(struct uacce_device *uacce)
478{
479 if (!uacce)
480 return -ENODEV;
481
482 uacce->cdev = cdev_alloc();
483 if (!uacce->cdev)
484 return -ENOMEM;
485
486 uacce->cdev->ops = &uacce_fops;
487 uacce->cdev->owner = THIS_MODULE;
488
489 return cdev_device_add(uacce->cdev, &uacce->dev);
490}
491EXPORT_SYMBOL_GPL(uacce_register);
492
493
494
495
496
497void uacce_remove(struct uacce_device *uacce)
498{
499 struct uacce_queue *q, *next_q;
500
501 if (!uacce)
502 return;
503
504
505
506
507 if (uacce->inode)
508 unmap_mapping_range(uacce->inode->i_mapping, 0, 0, 1);
509
510
511 mutex_lock(&uacce->queues_lock);
512 list_for_each_entry_safe(q, next_q, &uacce->queues, list) {
513 uacce_put_queue(q);
514 uacce_unbind_queue(q);
515 }
516 mutex_unlock(&uacce->queues_lock);
517
518
519 uacce_disable_sva(uacce);
520
521 if (uacce->cdev)
522 cdev_device_del(uacce->cdev, &uacce->dev);
523 xa_erase(&uacce_xa, uacce->dev_id);
524 put_device(&uacce->dev);
525}
526EXPORT_SYMBOL_GPL(uacce_remove);
527
528static int __init uacce_init(void)
529{
530 int ret;
531
532 uacce_class = class_create(THIS_MODULE, UACCE_NAME);
533 if (IS_ERR(uacce_class))
534 return PTR_ERR(uacce_class);
535
536 ret = alloc_chrdev_region(&uacce_devt, 0, MINORMASK, UACCE_NAME);
537 if (ret)
538 class_destroy(uacce_class);
539
540 return ret;
541}
542
543static __exit void uacce_exit(void)
544{
545 unregister_chrdev_region(uacce_devt, MINORMASK);
546 class_destroy(uacce_class);
547}
548
549subsys_initcall(uacce_init);
550module_exit(uacce_exit);
551
552MODULE_LICENSE("GPL");
553MODULE_AUTHOR("HiSilicon Tech. Co., Ltd.");
554MODULE_DESCRIPTION("Accelerator interface for Userland applications");
555
