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 int 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 = 0;
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 if (!uacce->ops->mmap) {
235 ret = -EINVAL;
236 goto out_with_lock;
237 }
238
239 ret = uacce->ops->mmap(q, vma, qfr);
240 if (ret)
241 goto out_with_lock;
242
243 break;
244
245 case UACCE_QFRT_DUS:
246 if (!uacce->ops->mmap) {
247 ret = -EINVAL;
248 goto out_with_lock;
249 }
250
251 ret = uacce->ops->mmap(q, vma, qfr);
252 if (ret)
253 goto out_with_lock;
254 break;
255
256 default:
257 ret = -EINVAL;
258 goto out_with_lock;
259 }
260
261 q->qfrs[type] = qfr;
262 mutex_unlock(&uacce_mutex);
263
264 return ret;
265
266out_with_lock:
267 mutex_unlock(&uacce_mutex);
268 kfree(qfr);
269 return ret;
270}
271
272static __poll_t uacce_fops_poll(struct file *file, poll_table *wait)
273{
274 struct uacce_queue *q = file->private_data;
275 struct uacce_device *uacce = q->uacce;
276
277 poll_wait(file, &q->wait, wait);
278 if (uacce->ops->is_q_updated && uacce->ops->is_q_updated(q))
279 return EPOLLIN | EPOLLRDNORM;
280
281 return 0;
282}
283
284static const struct file_operations uacce_fops = {
285 .owner = THIS_MODULE,
286 .open = uacce_fops_open,
287 .release = uacce_fops_release,
288 .unlocked_ioctl = uacce_fops_unl_ioctl,
289#ifdef CONFIG_COMPAT
290 .compat_ioctl = uacce_fops_compat_ioctl,
291#endif
292 .mmap = uacce_fops_mmap,
293 .poll = uacce_fops_poll,
294};
295
296#define to_uacce_device(dev) container_of(dev, struct uacce_device, dev)
297
298static ssize_t api_show(struct device *dev,
299 struct device_attribute *attr, char *buf)
300{
301 struct uacce_device *uacce = to_uacce_device(dev);
302
303 return sprintf(buf, "%s\n", uacce->api_ver);
304}
305
306static ssize_t flags_show(struct device *dev,
307 struct device_attribute *attr, char *buf)
308{
309 struct uacce_device *uacce = to_uacce_device(dev);
310
311 return sprintf(buf, "%u\n", uacce->flags);
312}
313
314static ssize_t available_instances_show(struct device *dev,
315 struct device_attribute *attr,
316 char *buf)
317{
318 struct uacce_device *uacce = to_uacce_device(dev);
319
320 if (!uacce->ops->get_available_instances)
321 return -ENODEV;
322
323 return sprintf(buf, "%d\n",
324 uacce->ops->get_available_instances(uacce));
325}
326
327static ssize_t algorithms_show(struct device *dev,
328 struct device_attribute *attr, char *buf)
329{
330 struct uacce_device *uacce = to_uacce_device(dev);
331
332 return sprintf(buf, "%s\n", uacce->algs);
333}
334
335static ssize_t region_mmio_size_show(struct device *dev,
336 struct device_attribute *attr, char *buf)
337{
338 struct uacce_device *uacce = to_uacce_device(dev);
339
340 return sprintf(buf, "%lu\n",
341 uacce->qf_pg_num[UACCE_QFRT_MMIO] << PAGE_SHIFT);
342}
343
344static ssize_t region_dus_size_show(struct device *dev,
345 struct device_attribute *attr, char *buf)
346{
347 struct uacce_device *uacce = to_uacce_device(dev);
348
349 return sprintf(buf, "%lu\n",
350 uacce->qf_pg_num[UACCE_QFRT_DUS] << PAGE_SHIFT);
351}
352
353static DEVICE_ATTR_RO(api);
354static DEVICE_ATTR_RO(flags);
355static DEVICE_ATTR_RO(available_instances);
356static DEVICE_ATTR_RO(algorithms);
357static DEVICE_ATTR_RO(region_mmio_size);
358static DEVICE_ATTR_RO(region_dus_size);
359
360static struct attribute *uacce_dev_attrs[] = {
361 &dev_attr_api.attr,
362 &dev_attr_flags.attr,
363 &dev_attr_available_instances.attr,
364 &dev_attr_algorithms.attr,
365 &dev_attr_region_mmio_size.attr,
366 &dev_attr_region_dus_size.attr,
367 NULL,
368};
369
370static umode_t uacce_dev_is_visible(struct kobject *kobj,
371 struct attribute *attr, int n)
372{
373 struct device *dev = container_of(kobj, struct device, kobj);
374 struct uacce_device *uacce = to_uacce_device(dev);
375
376 if (((attr == &dev_attr_region_mmio_size.attr) &&
377 (!uacce->qf_pg_num[UACCE_QFRT_MMIO])) ||
378 ((attr == &dev_attr_region_dus_size.attr) &&
379 (!uacce->qf_pg_num[UACCE_QFRT_DUS])))
380 return 0;
381
382 return attr->mode;
383}
384
385static struct attribute_group uacce_dev_group = {
386 .is_visible = uacce_dev_is_visible,
387 .attrs = uacce_dev_attrs,
388};
389
390__ATTRIBUTE_GROUPS(uacce_dev);
391
392static void uacce_release(struct device *dev)
393{
394 struct uacce_device *uacce = to_uacce_device(dev);
395
396 kfree(uacce);
397}
398
399
400
401
402
403
404
405
406
407struct uacce_device *uacce_alloc(struct device *parent,
408 struct uacce_interface *interface)
409{
410 unsigned int flags = interface->flags;
411 struct uacce_device *uacce;
412 int ret;
413
414 uacce = kzalloc(sizeof(struct uacce_device), GFP_KERNEL);
415 if (!uacce)
416 return ERR_PTR(-ENOMEM);
417
418 if (flags & UACCE_DEV_SVA) {
419 ret = iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_SVA);
420 if (ret)
421 flags &= ~UACCE_DEV_SVA;
422 }
423
424 uacce->parent = parent;
425 uacce->flags = flags;
426 uacce->ops = interface->ops;
427
428 ret = xa_alloc(&uacce_xa, &uacce->dev_id, uacce, xa_limit_32b,
429 GFP_KERNEL);
430 if (ret < 0)
431 goto err_with_uacce;
432
433 INIT_LIST_HEAD(&uacce->queues);
434 mutex_init(&uacce->queues_lock);
435 device_initialize(&uacce->dev);
436 uacce->dev.devt = MKDEV(MAJOR(uacce_devt), uacce->dev_id);
437 uacce->dev.class = uacce_class;
438 uacce->dev.groups = uacce_dev_groups;
439 uacce->dev.parent = uacce->parent;
440 uacce->dev.release = uacce_release;
441 dev_set_name(&uacce->dev, "%s-%d", interface->name, uacce->dev_id);
442
443 return uacce;
444
445err_with_uacce:
446 if (flags & UACCE_DEV_SVA)
447 iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_SVA);
448 kfree(uacce);
449 return ERR_PTR(ret);
450}
451EXPORT_SYMBOL_GPL(uacce_alloc);
452
453
454
455
456
457
458
459int uacce_register(struct uacce_device *uacce)
460{
461 if (!uacce)
462 return -ENODEV;
463
464 uacce->cdev = cdev_alloc();
465 if (!uacce->cdev)
466 return -ENOMEM;
467
468 uacce->cdev->ops = &uacce_fops;
469 uacce->cdev->owner = THIS_MODULE;
470
471 return cdev_device_add(uacce->cdev, &uacce->dev);
472}
473EXPORT_SYMBOL_GPL(uacce_register);
474
475
476
477
478
479void uacce_remove(struct uacce_device *uacce)
480{
481 struct uacce_queue *q, *next_q;
482
483 if (!uacce)
484 return;
485
486
487
488
489 if (uacce->inode)
490 unmap_mapping_range(uacce->inode->i_mapping, 0, 0, 1);
491
492
493 mutex_lock(&uacce->queues_lock);
494 list_for_each_entry_safe(q, next_q, &uacce->queues, list) {
495 uacce_put_queue(q);
496 uacce_unbind_queue(q);
497 }
498 mutex_unlock(&uacce->queues_lock);
499
500
501 if (uacce->flags & UACCE_DEV_SVA)
502 iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_SVA);
503
504 if (uacce->cdev)
505 cdev_device_del(uacce->cdev, &uacce->dev);
506 xa_erase(&uacce_xa, uacce->dev_id);
507 put_device(&uacce->dev);
508}
509EXPORT_SYMBOL_GPL(uacce_remove);
510
511static int __init uacce_init(void)
512{
513 int ret;
514
515 uacce_class = class_create(THIS_MODULE, UACCE_NAME);
516 if (IS_ERR(uacce_class))
517 return PTR_ERR(uacce_class);
518
519 ret = alloc_chrdev_region(&uacce_devt, 0, MINORMASK, UACCE_NAME);
520 if (ret)
521 class_destroy(uacce_class);
522
523 return ret;
524}
525
526static __exit void uacce_exit(void)
527{
528 unregister_chrdev_region(uacce_devt, MINORMASK);
529 class_destroy(uacce_class);
530}
531
532subsys_initcall(uacce_init);
533module_exit(uacce_exit);
534
535MODULE_LICENSE("GPL");
536MODULE_AUTHOR("Hisilicon Tech. Co., Ltd.");
537MODULE_DESCRIPTION("Accelerator interface for Userland applications");
538
