1 /*
2  * VFIO: IOMMU DMA mapping support for TCE on POWER
3  *
4  * Copyright (C) 2013 IBM Corp.  All rights reserved.
5  *     Author: Alexey Kardashevskiy <aik@ozlabs.ru>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  *
11  * Derived from original vfio_iommu_type1.c:
12  * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
13  *     Author: Alex Williamson <alex.williamson@redhat.com>
14  */
15 
16 #include <linux/module.h>
17 #include <linux/pci.h>
18 #include <linux/slab.h>
19 #include <linux/uaccess.h>
20 #include <linux/err.h>
21 #include <linux/vfio.h>
22 #include <linux/vmalloc.h>
23 #include <linux/sched/mm.h>
24 #include <linux/sched/signal.h>
25 
26 #include <asm/iommu.h>
27 #include <asm/tce.h>
28 #include <asm/mmu_context.h>
29 
30 #define DRIVER_VERSION  "0.1"
31 #define DRIVER_AUTHOR   "aik@ozlabs.ru"
32 #define DRIVER_DESC     "VFIO IOMMU SPAPR TCE"
33 
34 static void tce_iommu_detach_group(void *iommu_data,
35 		struct iommu_group *iommu_group);
36 
37 static long try_increment_locked_vm(struct mm_struct *mm, long npages)
38 {
39 	long ret = 0, locked, lock_limit;
40 
41 	if (WARN_ON_ONCE(!mm))
42 		return -EPERM;
43 
44 	if (!npages)
45 		return 0;
46 
47 	down_write(&mm->mmap_sem);
48 	locked = mm->locked_vm + npages;
49 	lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
50 	if (locked > lock_limit && !capable(CAP_IPC_LOCK))
51 		ret = -ENOMEM;
52 	else
53 		mm->locked_vm += npages;
54 
55 	pr_debug("[%d] RLIMIT_MEMLOCK +%ld %ld/%ld%s\n", current->pid,
56 			npages << PAGE_SHIFT,
57 			mm->locked_vm << PAGE_SHIFT,
58 			rlimit(RLIMIT_MEMLOCK),
59 			ret ? " - exceeded" : "");
60 
61 	up_write(&mm->mmap_sem);
62 
63 	return ret;
64 }
65 
66 static void decrement_locked_vm(struct mm_struct *mm, long npages)
67 {
68 	if (!mm || !npages)
69 		return;
70 
71 	down_write(&mm->mmap_sem);
72 	if (WARN_ON_ONCE(npages > mm->locked_vm))
73 		npages = mm->locked_vm;
74 	mm->locked_vm -= npages;
75 	pr_debug("[%d] RLIMIT_MEMLOCK -%ld %ld/%ld\n", current->pid,
76 			npages << PAGE_SHIFT,
77 			mm->locked_vm << PAGE_SHIFT,
78 			rlimit(RLIMIT_MEMLOCK));
79 	up_write(&mm->mmap_sem);
80 }
81 
82 /*
83  * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation
84  *
85  * This code handles mapping and unmapping of user data buffers
86  * into DMA'ble space using the IOMMU
87  */
88 
89 struct tce_iommu_group {
90 	struct list_head next;
91 	struct iommu_group *grp;
92 };
93 
94 /*
95  * A container needs to remember which preregistered region  it has
96  * referenced to do proper cleanup at the userspace process exit.
97  */
98 struct tce_iommu_prereg {
99 	struct list_head next;
100 	struct mm_iommu_table_group_mem_t *mem;
101 };
102 
103 /*
104  * The container descriptor supports only a single group per container.
105  * Required by the API as the container is not supplied with the IOMMU group
106  * at the moment of initialization.
107  */
108 struct tce_container {
109 	struct mutex lock;
110 	bool enabled;
111 	bool v2;
112 	bool def_window_pending;
113 	unsigned long locked_pages;
114 	struct mm_struct *mm;
115 	struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES];
116 	struct list_head group_list;
117 	struct list_head prereg_list;
118 };
119 
120 static long tce_iommu_mm_set(struct tce_container *container)
121 {
122 	if (container->mm) {
123 		if (container->mm == current->mm)
124 			return 0;
125 		return -EPERM;
126 	}
127 	BUG_ON(!current->mm);
128 	container->mm = current->mm;
129 	atomic_inc(&container->mm->mm_count);
130 
131 	return 0;
132 }
133 
134 static long tce_iommu_prereg_free(struct tce_container *container,
135 		struct tce_iommu_prereg *tcemem)
136 {
137 	long ret;
138 
139 	ret = mm_iommu_put(container->mm, tcemem->mem);
140 	if (ret)
141 		return ret;
142 
143 	list_del(&tcemem->next);
144 	kfree(tcemem);
145 
146 	return 0;
147 }
148 
149 static long tce_iommu_unregister_pages(struct tce_container *container,
150 		__u64 vaddr, __u64 size)
151 {
152 	struct mm_iommu_table_group_mem_t *mem;
153 	struct tce_iommu_prereg *tcemem;
154 	bool found = false;
155 
156 	if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK))
157 		return -EINVAL;
158 
159 	mem = mm_iommu_find(container->mm, vaddr, size >> PAGE_SHIFT);
160 	if (!mem)
161 		return -ENOENT;
162 
163 	list_for_each_entry(tcemem, &container->prereg_list, next) {
164 		if (tcemem->mem == mem) {
165 			found = true;
166 			break;
167 		}
168 	}
169 
170 	if (!found)
171 		return -ENOENT;
172 
173 	return tce_iommu_prereg_free(container, tcemem);
174 }
175 
176 static long tce_iommu_register_pages(struct tce_container *container,
177 		__u64 vaddr, __u64 size)
178 {
179 	long ret = 0;
180 	struct mm_iommu_table_group_mem_t *mem = NULL;
181 	struct tce_iommu_prereg *tcemem;
182 	unsigned long entries = size >> PAGE_SHIFT;
183 
184 	if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK) ||
185 			((vaddr + size) < vaddr))
186 		return -EINVAL;
187 
188 	mem = mm_iommu_find(container->mm, vaddr, entries);
189 	if (mem) {
190 		list_for_each_entry(tcemem, &container->prereg_list, next) {
191 			if (tcemem->mem == mem)
192 				return -EBUSY;
193 		}
194 	}
195 
196 	ret = mm_iommu_get(container->mm, vaddr, entries, &mem);
197 	if (ret)
198 		return ret;
199 
200 	tcemem = kzalloc(sizeof(*tcemem), GFP_KERNEL);
201 	if (!tcemem) {
202 		mm_iommu_put(container->mm, mem);
203 		return -ENOMEM;
204 	}
205 
206 	tcemem->mem = mem;
207 	list_add(&tcemem->next, &container->prereg_list);
208 
209 	container->enabled = true;
210 
211 	return 0;
212 }
213 
214 static long tce_iommu_userspace_view_alloc(struct iommu_table *tbl,
215 		struct mm_struct *mm)
216 {
217 	unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) *
218 			tbl->it_size, PAGE_SIZE);
219 	unsigned long *uas;
220 	long ret;
221 
222 	BUG_ON(tbl->it_userspace);
223 
224 	ret = try_increment_locked_vm(mm, cb >> PAGE_SHIFT);
225 	if (ret)
226 		return ret;
227 
228 	uas = vzalloc(cb);
229 	if (!uas) {
230 		decrement_locked_vm(mm, cb >> PAGE_SHIFT);
231 		return -ENOMEM;
232 	}
233 	tbl->it_userspace = uas;
234 
235 	return 0;
236 }
237 
238 static void tce_iommu_userspace_view_free(struct iommu_table *tbl,
239 		struct mm_struct *mm)
240 {
241 	unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) *
242 			tbl->it_size, PAGE_SIZE);
243 
244 	if (!tbl->it_userspace)
245 		return;
246 
247 	vfree(tbl->it_userspace);
248 	tbl->it_userspace = NULL;
249 	decrement_locked_vm(mm, cb >> PAGE_SHIFT);
250 }
251 
252 static bool tce_page_is_contained(struct page *page, unsigned page_shift)
253 {
254 	/*
255 	 * Check that the TCE table granularity is not bigger than the size of
256 	 * a page we just found. Otherwise the hardware can get access to
257 	 * a bigger memory chunk that it should.
258 	 */
259 	return (PAGE_SHIFT + compound_order(compound_head(page))) >= page_shift;
260 }
261 
262 static inline bool tce_groups_attached(struct tce_container *container)
263 {
264 	return !list_empty(&container->group_list);
265 }
266 
267 static long tce_iommu_find_table(struct tce_container *container,
268 		phys_addr_t ioba, struct iommu_table **ptbl)
269 {
270 	long i;
271 
272 	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
273 		struct iommu_table *tbl = container->tables[i];
274 
275 		if (tbl) {
276 			unsigned long entry = ioba >> tbl->it_page_shift;
277 			unsigned long start = tbl->it_offset;
278 			unsigned long end = start + tbl->it_size;
279 
280 			if ((start <= entry) && (entry < end)) {
281 				*ptbl = tbl;
282 				return i;
283 			}
284 		}
285 	}
286 
287 	return -1;
288 }
289 
290 static int tce_iommu_find_free_table(struct tce_container *container)
291 {
292 	int i;
293 
294 	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
295 		if (!container->tables[i])
296 			return i;
297 	}
298 
299 	return -ENOSPC;
300 }
301 
302 static int tce_iommu_enable(struct tce_container *container)
303 {
304 	int ret = 0;
305 	unsigned long locked;
306 	struct iommu_table_group *table_group;
307 	struct tce_iommu_group *tcegrp;
308 
309 	if (container->enabled)
310 		return -EBUSY;
311 
312 	/*
313 	 * When userspace pages are mapped into the IOMMU, they are effectively
314 	 * locked memory, so, theoretically, we need to update the accounting
315 	 * of locked pages on each map and unmap.  For powerpc, the map unmap
316 	 * paths can be very hot, though, and the accounting would kill
317 	 * performance, especially since it would be difficult to impossible
318 	 * to handle the accounting in real mode only.
319 	 *
320 	 * To address that, rather than precisely accounting every page, we
321 	 * instead account for a worst case on locked memory when the iommu is
322 	 * enabled and disabled.  The worst case upper bound on locked memory
323 	 * is the size of the whole iommu window, which is usually relatively
324 	 * small (compared to total memory sizes) on POWER hardware.
325 	 *
326 	 * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits,
327 	 * that would effectively kill the guest at random points, much better
328 	 * enforcing the limit based on the max that the guest can map.
329 	 *
330 	 * Unfortunately at the moment it counts whole tables, no matter how
331 	 * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups
332 	 * each with 2GB DMA window, 8GB will be counted here. The reason for
333 	 * this is that we cannot tell here the amount of RAM used by the guest
334 	 * as this information is only available from KVM and VFIO is
335 	 * KVM agnostic.
336 	 *
337 	 * So we do not allow enabling a container without a group attached
338 	 * as there is no way to know how much we should increment
339 	 * the locked_vm counter.
340 	 */
341 	if (!tce_groups_attached(container))
342 		return -ENODEV;
343 
344 	tcegrp = list_first_entry(&container->group_list,
345 			struct tce_iommu_group, next);
346 	table_group = iommu_group_get_iommudata(tcegrp->grp);
347 	if (!table_group)
348 		return -ENODEV;
349 
350 	if (!table_group->tce32_size)
351 		return -EPERM;
352 
353 	ret = tce_iommu_mm_set(container);
354 	if (ret)
355 		return ret;
356 
357 	locked = table_group->tce32_size >> PAGE_SHIFT;
358 	ret = try_increment_locked_vm(container->mm, locked);
359 	if (ret)
360 		return ret;
361 
362 	container->locked_pages = locked;
363 
364 	container->enabled = true;
365 
366 	return ret;
367 }
368 
369 static void tce_iommu_disable(struct tce_container *container)
370 {
371 	if (!container->enabled)
372 		return;
373 
374 	container->enabled = false;
375 
376 	BUG_ON(!container->mm);
377 	decrement_locked_vm(container->mm, container->locked_pages);
378 }
379 
380 static void *tce_iommu_open(unsigned long arg)
381 {
382 	struct tce_container *container;
383 
384 	if ((arg != VFIO_SPAPR_TCE_IOMMU) && (arg != VFIO_SPAPR_TCE_v2_IOMMU)) {
385 		pr_err("tce_vfio: Wrong IOMMU type\n");
386 		return ERR_PTR(-EINVAL);
387 	}
388 
389 	container = kzalloc(sizeof(*container), GFP_KERNEL);
390 	if (!container)
391 		return ERR_PTR(-ENOMEM);
392 
393 	mutex_init(&container->lock);
394 	INIT_LIST_HEAD_RCU(&container->group_list);
395 	INIT_LIST_HEAD_RCU(&container->prereg_list);
396 
397 	container->v2 = arg == VFIO_SPAPR_TCE_v2_IOMMU;
398 
399 	return container;
400 }
401 
402 static int tce_iommu_clear(struct tce_container *container,
403 		struct iommu_table *tbl,
404 		unsigned long entry, unsigned long pages);
405 static void tce_iommu_free_table(struct tce_container *container,
406 		struct iommu_table *tbl);
407 
408 static void tce_iommu_release(void *iommu_data)
409 {
410 	struct tce_container *container = iommu_data;
411 	struct tce_iommu_group *tcegrp;
412 	long i;
413 
414 	while (tce_groups_attached(container)) {
415 		tcegrp = list_first_entry(&container->group_list,
416 				struct tce_iommu_group, next);
417 		tce_iommu_detach_group(iommu_data, tcegrp->grp);
418 	}
419 
420 	/*
421 	 * If VFIO created a table, it was not disposed
422 	 * by tce_iommu_detach_group() so do it now.
423 	 */
424 	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
425 		struct iommu_table *tbl = container->tables[i];
426 
427 		if (!tbl)
428 			continue;
429 
430 		tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
431 		tce_iommu_free_table(container, tbl);
432 	}
433 
434 	while (!list_empty(&container->prereg_list)) {
435 		struct tce_iommu_prereg *tcemem;
436 
437 		tcemem = list_first_entry(&container->prereg_list,
438 				struct tce_iommu_prereg, next);
439 		WARN_ON_ONCE(tce_iommu_prereg_free(container, tcemem));
440 	}
441 
442 	tce_iommu_disable(container);
443 	if (container->mm)
444 		mmdrop(container->mm);
445 	mutex_destroy(&container->lock);
446 
447 	kfree(container);
448 }
449 
450 static void tce_iommu_unuse_page(struct tce_container *container,
451 		unsigned long hpa)
452 {
453 	struct page *page;
454 
455 	page = pfn_to_page(hpa >> PAGE_SHIFT);
456 	put_page(page);
457 }
458 
459 static int tce_iommu_prereg_ua_to_hpa(struct tce_container *container,
460 		unsigned long tce, unsigned long size,
461 		unsigned long *phpa, struct mm_iommu_table_group_mem_t **pmem)
462 {
463 	long ret = 0;
464 	struct mm_iommu_table_group_mem_t *mem;
465 
466 	mem = mm_iommu_lookup(container->mm, tce, size);
467 	if (!mem)
468 		return -EINVAL;
469 
470 	ret = mm_iommu_ua_to_hpa(mem, tce, phpa);
471 	if (ret)
472 		return -EINVAL;
473 
474 	*pmem = mem;
475 
476 	return 0;
477 }
478 
479 static void tce_iommu_unuse_page_v2(struct tce_container *container,
480 		struct iommu_table *tbl, unsigned long entry)
481 {
482 	struct mm_iommu_table_group_mem_t *mem = NULL;
483 	int ret;
484 	unsigned long hpa = 0;
485 	unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
486 
487 	if (!pua)
488 		return;
489 
490 	ret = tce_iommu_prereg_ua_to_hpa(container, *pua, IOMMU_PAGE_SIZE(tbl),
491 			&hpa, &mem);
492 	if (ret)
493 		pr_debug("%s: tce %lx at #%lx was not cached, ret=%d\n",
494 				__func__, *pua, entry, ret);
495 	if (mem)
496 		mm_iommu_mapped_dec(mem);
497 
498 	*pua = 0;
499 }
500 
501 static int tce_iommu_clear(struct tce_container *container,
502 		struct iommu_table *tbl,
503 		unsigned long entry, unsigned long pages)
504 {
505 	unsigned long oldhpa;
506 	long ret;
507 	enum dma_data_direction direction;
508 
509 	for ( ; pages; --pages, ++entry) {
510 		direction = DMA_NONE;
511 		oldhpa = 0;
512 		ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction);
513 		if (ret)
514 			continue;
515 
516 		if (direction == DMA_NONE)
517 			continue;
518 
519 		if (container->v2) {
520 			tce_iommu_unuse_page_v2(container, tbl, entry);
521 			continue;
522 		}
523 
524 		tce_iommu_unuse_page(container, oldhpa);
525 	}
526 
527 	return 0;
528 }
529 
530 static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa)
531 {
532 	struct page *page = NULL;
533 	enum dma_data_direction direction = iommu_tce_direction(tce);
534 
535 	if (get_user_pages_fast(tce & PAGE_MASK, 1,
536 			direction != DMA_TO_DEVICE, &page) != 1)
537 		return -EFAULT;
538 
539 	*hpa = __pa((unsigned long) page_address(page));
540 
541 	return 0;
542 }
543 
544 static long tce_iommu_build(struct tce_container *container,
545 		struct iommu_table *tbl,
546 		unsigned long entry, unsigned long tce, unsigned long pages,
547 		enum dma_data_direction direction)
548 {
549 	long i, ret = 0;
550 	struct page *page;
551 	unsigned long hpa;
552 	enum dma_data_direction dirtmp;
553 
554 	for (i = 0; i < pages; ++i) {
555 		unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
556 
557 		ret = tce_iommu_use_page(tce, &hpa);
558 		if (ret)
559 			break;
560 
561 		page = pfn_to_page(hpa >> PAGE_SHIFT);
562 		if (!tce_page_is_contained(page, tbl->it_page_shift)) {
563 			ret = -EPERM;
564 			break;
565 		}
566 
567 		hpa |= offset;
568 		dirtmp = direction;
569 		ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp);
570 		if (ret) {
571 			tce_iommu_unuse_page(container, hpa);
572 			pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
573 					__func__, entry << tbl->it_page_shift,
574 					tce, ret);
575 			break;
576 		}
577 
578 		if (dirtmp != DMA_NONE)
579 			tce_iommu_unuse_page(container, hpa);
580 
581 		tce += IOMMU_PAGE_SIZE(tbl);
582 	}
583 
584 	if (ret)
585 		tce_iommu_clear(container, tbl, entry, i);
586 
587 	return ret;
588 }
589 
590 static long tce_iommu_build_v2(struct tce_container *container,
591 		struct iommu_table *tbl,
592 		unsigned long entry, unsigned long tce, unsigned long pages,
593 		enum dma_data_direction direction)
594 {
595 	long i, ret = 0;
596 	struct page *page;
597 	unsigned long hpa;
598 	enum dma_data_direction dirtmp;
599 
600 	if (!tbl->it_userspace) {
601 		ret = tce_iommu_userspace_view_alloc(tbl, container->mm);
602 		if (ret)
603 			return ret;
604 	}
605 
606 	for (i = 0; i < pages; ++i) {
607 		struct mm_iommu_table_group_mem_t *mem = NULL;
608 		unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl,
609 				entry + i);
610 
611 		ret = tce_iommu_prereg_ua_to_hpa(container,
612 				tce, IOMMU_PAGE_SIZE(tbl), &hpa, &mem);
613 		if (ret)
614 			break;
615 
616 		page = pfn_to_page(hpa >> PAGE_SHIFT);
617 		if (!tce_page_is_contained(page, tbl->it_page_shift)) {
618 			ret = -EPERM;
619 			break;
620 		}
621 
622 		/* Preserve offset within IOMMU page */
623 		hpa |= tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
624 		dirtmp = direction;
625 
626 		/* The registered region is being unregistered */
627 		if (mm_iommu_mapped_inc(mem))
628 			break;
629 
630 		ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp);
631 		if (ret) {
632 			/* dirtmp cannot be DMA_NONE here */
633 			tce_iommu_unuse_page_v2(container, tbl, entry + i);
634 			pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
635 					__func__, entry << tbl->it_page_shift,
636 					tce, ret);
637 			break;
638 		}
639 
640 		if (dirtmp != DMA_NONE)
641 			tce_iommu_unuse_page_v2(container, tbl, entry + i);
642 
643 		*pua = tce;
644 
645 		tce += IOMMU_PAGE_SIZE(tbl);
646 	}
647 
648 	if (ret)
649 		tce_iommu_clear(container, tbl, entry, i);
650 
651 	return ret;
652 }
653 
654 static long tce_iommu_create_table(struct tce_container *container,
655 			struct iommu_table_group *table_group,
656 			int num,
657 			__u32 page_shift,
658 			__u64 window_size,
659 			__u32 levels,
660 			struct iommu_table **ptbl)
661 {
662 	long ret, table_size;
663 
664 	table_size = table_group->ops->get_table_size(page_shift, window_size,
665 			levels);
666 	if (!table_size)
667 		return -EINVAL;
668 
669 	ret = try_increment_locked_vm(container->mm, table_size >> PAGE_SHIFT);
670 	if (ret)
671 		return ret;
672 
673 	ret = table_group->ops->create_table(table_group, num,
674 			page_shift, window_size, levels, ptbl);
675 
676 	WARN_ON(!ret && !(*ptbl)->it_ops->free);
677 	WARN_ON(!ret && ((*ptbl)->it_allocated_size != table_size));
678 
679 	return ret;
680 }
681 
682 static void tce_iommu_free_table(struct tce_container *container,
683 		struct iommu_table *tbl)
684 {
685 	unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT;
686 
687 	tce_iommu_userspace_view_free(tbl, container->mm);
688 	iommu_tce_table_put(tbl);
689 	decrement_locked_vm(container->mm, pages);
690 }
691 
692 static long tce_iommu_create_window(struct tce_container *container,
693 		__u32 page_shift, __u64 window_size, __u32 levels,
694 		__u64 *start_addr)
695 {
696 	struct tce_iommu_group *tcegrp;
697 	struct iommu_table_group *table_group;
698 	struct iommu_table *tbl = NULL;
699 	long ret, num;
700 
701 	num = tce_iommu_find_free_table(container);
702 	if (num < 0)
703 		return num;
704 
705 	/* Get the first group for ops::create_table */
706 	tcegrp = list_first_entry(&container->group_list,
707 			struct tce_iommu_group, next);
708 	table_group = iommu_group_get_iommudata(tcegrp->grp);
709 	if (!table_group)
710 		return -EFAULT;
711 
712 	if (!(table_group->pgsizes & (1ULL << page_shift)))
713 		return -EINVAL;
714 
715 	if (!table_group->ops->set_window || !table_group->ops->unset_window ||
716 			!table_group->ops->get_table_size ||
717 			!table_group->ops->create_table)
718 		return -EPERM;
719 
720 	/* Create TCE table */
721 	ret = tce_iommu_create_table(container, table_group, num,
722 			page_shift, window_size, levels, &tbl);
723 	if (ret)
724 		return ret;
725 
726 	BUG_ON(!tbl->it_ops->free);
727 
728 	/*
729 	 * Program the table to every group.
730 	 * Groups have been tested for compatibility at the attach time.
731 	 */
732 	list_for_each_entry(tcegrp, &container->group_list, next) {
733 		table_group = iommu_group_get_iommudata(tcegrp->grp);
734 
735 		ret = table_group->ops->set_window(table_group, num, tbl);
736 		if (ret)
737 			goto unset_exit;
738 	}
739 
740 	container->tables[num] = tbl;
741 
742 	/* Return start address assigned by platform in create_table() */
743 	*start_addr = tbl->it_offset << tbl->it_page_shift;
744 
745 	return 0;
746 
747 unset_exit:
748 	list_for_each_entry(tcegrp, &container->group_list, next) {
749 		table_group = iommu_group_get_iommudata(tcegrp->grp);
750 		table_group->ops->unset_window(table_group, num);
751 	}
752 	tce_iommu_free_table(container, tbl);
753 
754 	return ret;
755 }
756 
757 static long tce_iommu_remove_window(struct tce_container *container,
758 		__u64 start_addr)
759 {
760 	struct iommu_table_group *table_group = NULL;
761 	struct iommu_table *tbl;
762 	struct tce_iommu_group *tcegrp;
763 	int num;
764 
765 	num = tce_iommu_find_table(container, start_addr, &tbl);
766 	if (num < 0)
767 		return -EINVAL;
768 
769 	BUG_ON(!tbl->it_size);
770 
771 	/* Detach groups from IOMMUs */
772 	list_for_each_entry(tcegrp, &container->group_list, next) {
773 		table_group = iommu_group_get_iommudata(tcegrp->grp);
774 
775 		/*
776 		 * SPAPR TCE IOMMU exposes the default DMA window to
777 		 * the guest via dma32_window_start/size of
778 		 * VFIO_IOMMU_SPAPR_TCE_GET_INFO. Some platforms allow
779 		 * the userspace to remove this window, some do not so
780 		 * here we check for the platform capability.
781 		 */
782 		if (!table_group->ops || !table_group->ops->unset_window)
783 			return -EPERM;
784 
785 		table_group->ops->unset_window(table_group, num);
786 	}
787 
788 	/* Free table */
789 	tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
790 	tce_iommu_free_table(container, tbl);
791 	container->tables[num] = NULL;
792 
793 	return 0;
794 }
795 
796 static long tce_iommu_create_default_window(struct tce_container *container)
797 {
798 	long ret;
799 	__u64 start_addr = 0;
800 	struct tce_iommu_group *tcegrp;
801 	struct iommu_table_group *table_group;
802 
803 	if (!container->def_window_pending)
804 		return 0;
805 
806 	if (!tce_groups_attached(container))
807 		return -ENODEV;
808 
809 	tcegrp = list_first_entry(&container->group_list,
810 			struct tce_iommu_group, next);
811 	table_group = iommu_group_get_iommudata(tcegrp->grp);
812 	if (!table_group)
813 		return -ENODEV;
814 
815 	ret = tce_iommu_create_window(container, IOMMU_PAGE_SHIFT_4K,
816 			table_group->tce32_size, 1, &start_addr);
817 	WARN_ON_ONCE(!ret && start_addr);
818 
819 	if (!ret)
820 		container->def_window_pending = false;
821 
822 	return ret;
823 }
824 
825 static long tce_iommu_ioctl(void *iommu_data,
826 				 unsigned int cmd, unsigned long arg)
827 {
828 	struct tce_container *container = iommu_data;
829 	unsigned long minsz, ddwsz;
830 	long ret;
831 
832 	switch (cmd) {
833 	case VFIO_CHECK_EXTENSION:
834 		switch (arg) {
835 		case VFIO_SPAPR_TCE_IOMMU:
836 		case VFIO_SPAPR_TCE_v2_IOMMU:
837 			ret = 1;
838 			break;
839 		default:
840 			ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg);
841 			break;
842 		}
843 
844 		return (ret < 0) ? 0 : ret;
845 	}
846 
847 	/*
848 	 * Sanity check to prevent one userspace from manipulating
849 	 * another userspace mm.
850 	 */
851 	BUG_ON(!container);
852 	if (container->mm && container->mm != current->mm)
853 		return -EPERM;
854 
855 	switch (cmd) {
856 	case VFIO_IOMMU_SPAPR_TCE_GET_INFO: {
857 		struct vfio_iommu_spapr_tce_info info;
858 		struct tce_iommu_group *tcegrp;
859 		struct iommu_table_group *table_group;
860 
861 		if (!tce_groups_attached(container))
862 			return -ENXIO;
863 
864 		tcegrp = list_first_entry(&container->group_list,
865 				struct tce_iommu_group, next);
866 		table_group = iommu_group_get_iommudata(tcegrp->grp);
867 
868 		if (!table_group)
869 			return -ENXIO;
870 
871 		minsz = offsetofend(struct vfio_iommu_spapr_tce_info,
872 				dma32_window_size);
873 
874 		if (copy_from_user(&info, (void __user *)arg, minsz))
875 			return -EFAULT;
876 
877 		if (info.argsz < minsz)
878 			return -EINVAL;
879 
880 		info.dma32_window_start = table_group->tce32_start;
881 		info.dma32_window_size = table_group->tce32_size;
882 		info.flags = 0;
883 		memset(&info.ddw, 0, sizeof(info.ddw));
884 
885 		if (table_group->max_dynamic_windows_supported &&
886 				container->v2) {
887 			info.flags |= VFIO_IOMMU_SPAPR_INFO_DDW;
888 			info.ddw.pgsizes = table_group->pgsizes;
889 			info.ddw.max_dynamic_windows_supported =
890 				table_group->max_dynamic_windows_supported;
891 			info.ddw.levels = table_group->max_levels;
892 		}
893 
894 		ddwsz = offsetofend(struct vfio_iommu_spapr_tce_info, ddw);
895 
896 		if (info.argsz >= ddwsz)
897 			minsz = ddwsz;
898 
899 		if (copy_to_user((void __user *)arg, &info, minsz))
900 			return -EFAULT;
901 
902 		return 0;
903 	}
904 	case VFIO_IOMMU_MAP_DMA: {
905 		struct vfio_iommu_type1_dma_map param;
906 		struct iommu_table *tbl = NULL;
907 		long num;
908 		enum dma_data_direction direction;
909 
910 		if (!container->enabled)
911 			return -EPERM;
912 
913 		minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
914 
915 		if (copy_from_user(&param, (void __user *)arg, minsz))
916 			return -EFAULT;
917 
918 		if (param.argsz < minsz)
919 			return -EINVAL;
920 
921 		if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ |
922 				VFIO_DMA_MAP_FLAG_WRITE))
923 			return -EINVAL;
924 
925 		ret = tce_iommu_create_default_window(container);
926 		if (ret)
927 			return ret;
928 
929 		num = tce_iommu_find_table(container, param.iova, &tbl);
930 		if (num < 0)
931 			return -ENXIO;
932 
933 		if ((param.size & ~IOMMU_PAGE_MASK(tbl)) ||
934 				(param.vaddr & ~IOMMU_PAGE_MASK(tbl)))
935 			return -EINVAL;
936 
937 		/* iova is checked by the IOMMU API */
938 		if (param.flags & VFIO_DMA_MAP_FLAG_READ) {
939 			if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
940 				direction = DMA_BIDIRECTIONAL;
941 			else
942 				direction = DMA_TO_DEVICE;
943 		} else {
944 			if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
945 				direction = DMA_FROM_DEVICE;
946 			else
947 				return -EINVAL;
948 		}
949 
950 		ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr);
951 		if (ret)
952 			return ret;
953 
954 		if (container->v2)
955 			ret = tce_iommu_build_v2(container, tbl,
956 					param.iova >> tbl->it_page_shift,
957 					param.vaddr,
958 					param.size >> tbl->it_page_shift,
959 					direction);
960 		else
961 			ret = tce_iommu_build(container, tbl,
962 					param.iova >> tbl->it_page_shift,
963 					param.vaddr,
964 					param.size >> tbl->it_page_shift,
965 					direction);
966 
967 		iommu_flush_tce(tbl);
968 
969 		return ret;
970 	}
971 	case VFIO_IOMMU_UNMAP_DMA: {
972 		struct vfio_iommu_type1_dma_unmap param;
973 		struct iommu_table *tbl = NULL;
974 		long num;
975 
976 		if (!container->enabled)
977 			return -EPERM;
978 
979 		minsz = offsetofend(struct vfio_iommu_type1_dma_unmap,
980 				size);
981 
982 		if (copy_from_user(&param, (void __user *)arg, minsz))
983 			return -EFAULT;
984 
985 		if (param.argsz < minsz)
986 			return -EINVAL;
987 
988 		/* No flag is supported now */
989 		if (param.flags)
990 			return -EINVAL;
991 
992 		ret = tce_iommu_create_default_window(container);
993 		if (ret)
994 			return ret;
995 
996 		num = tce_iommu_find_table(container, param.iova, &tbl);
997 		if (num < 0)
998 			return -ENXIO;
999 
1000 		if (param.size & ~IOMMU_PAGE_MASK(tbl))
1001 			return -EINVAL;
1002 
1003 		ret = iommu_tce_clear_param_check(tbl, param.iova, 0,
1004 				param.size >> tbl->it_page_shift);
1005 		if (ret)
1006 			return ret;
1007 
1008 		ret = tce_iommu_clear(container, tbl,
1009 				param.iova >> tbl->it_page_shift,
1010 				param.size >> tbl->it_page_shift);
1011 		iommu_flush_tce(tbl);
1012 
1013 		return ret;
1014 	}
1015 	case VFIO_IOMMU_SPAPR_REGISTER_MEMORY: {
1016 		struct vfio_iommu_spapr_register_memory param;
1017 
1018 		if (!container->v2)
1019 			break;
1020 
1021 		minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
1022 				size);
1023 
1024 		ret = tce_iommu_mm_set(container);
1025 		if (ret)
1026 			return ret;
1027 
1028 		if (copy_from_user(&param, (void __user *)arg, minsz))
1029 			return -EFAULT;
1030 
1031 		if (param.argsz < minsz)
1032 			return -EINVAL;
1033 
1034 		/* No flag is supported now */
1035 		if (param.flags)
1036 			return -EINVAL;
1037 
1038 		mutex_lock(&container->lock);
1039 		ret = tce_iommu_register_pages(container, param.vaddr,
1040 				param.size);
1041 		mutex_unlock(&container->lock);
1042 
1043 		return ret;
1044 	}
1045 	case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY: {
1046 		struct vfio_iommu_spapr_register_memory param;
1047 
1048 		if (!container->v2)
1049 			break;
1050 
1051 		if (!container->mm)
1052 			return -EPERM;
1053 
1054 		minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
1055 				size);
1056 
1057 		if (copy_from_user(&param, (void __user *)arg, minsz))
1058 			return -EFAULT;
1059 
1060 		if (param.argsz < minsz)
1061 			return -EINVAL;
1062 
1063 		/* No flag is supported now */
1064 		if (param.flags)
1065 			return -EINVAL;
1066 
1067 		mutex_lock(&container->lock);
1068 		ret = tce_iommu_unregister_pages(container, param.vaddr,
1069 				param.size);
1070 		mutex_unlock(&container->lock);
1071 
1072 		return ret;
1073 	}
1074 	case VFIO_IOMMU_ENABLE:
1075 		if (container->v2)
1076 			break;
1077 
1078 		mutex_lock(&container->lock);
1079 		ret = tce_iommu_enable(container);
1080 		mutex_unlock(&container->lock);
1081 		return ret;
1082 
1083 
1084 	case VFIO_IOMMU_DISABLE:
1085 		if (container->v2)
1086 			break;
1087 
1088 		mutex_lock(&container->lock);
1089 		tce_iommu_disable(container);
1090 		mutex_unlock(&container->lock);
1091 		return 0;
1092 
1093 	case VFIO_EEH_PE_OP: {
1094 		struct tce_iommu_group *tcegrp;
1095 
1096 		ret = 0;
1097 		list_for_each_entry(tcegrp, &container->group_list, next) {
1098 			ret = vfio_spapr_iommu_eeh_ioctl(tcegrp->grp,
1099 					cmd, arg);
1100 			if (ret)
1101 				return ret;
1102 		}
1103 		return ret;
1104 	}
1105 
1106 	case VFIO_IOMMU_SPAPR_TCE_CREATE: {
1107 		struct vfio_iommu_spapr_tce_create create;
1108 
1109 		if (!container->v2)
1110 			break;
1111 
1112 		ret = tce_iommu_mm_set(container);
1113 		if (ret)
1114 			return ret;
1115 
1116 		if (!tce_groups_attached(container))
1117 			return -ENXIO;
1118 
1119 		minsz = offsetofend(struct vfio_iommu_spapr_tce_create,
1120 				start_addr);
1121 
1122 		if (copy_from_user(&create, (void __user *)arg, minsz))
1123 			return -EFAULT;
1124 
1125 		if (create.argsz < minsz)
1126 			return -EINVAL;
1127 
1128 		if (create.flags)
1129 			return -EINVAL;
1130 
1131 		mutex_lock(&container->lock);
1132 
1133 		ret = tce_iommu_create_default_window(container);
1134 		if (!ret)
1135 			ret = tce_iommu_create_window(container,
1136 					create.page_shift,
1137 					create.window_size, create.levels,
1138 					&create.start_addr);
1139 
1140 		mutex_unlock(&container->lock);
1141 
1142 		if (!ret && copy_to_user((void __user *)arg, &create, minsz))
1143 			ret = -EFAULT;
1144 
1145 		return ret;
1146 	}
1147 	case VFIO_IOMMU_SPAPR_TCE_REMOVE: {
1148 		struct vfio_iommu_spapr_tce_remove remove;
1149 
1150 		if (!container->v2)
1151 			break;
1152 
1153 		ret = tce_iommu_mm_set(container);
1154 		if (ret)
1155 			return ret;
1156 
1157 		if (!tce_groups_attached(container))
1158 			return -ENXIO;
1159 
1160 		minsz = offsetofend(struct vfio_iommu_spapr_tce_remove,
1161 				start_addr);
1162 
1163 		if (copy_from_user(&remove, (void __user *)arg, minsz))
1164 			return -EFAULT;
1165 
1166 		if (remove.argsz < minsz)
1167 			return -EINVAL;
1168 
1169 		if (remove.flags)
1170 			return -EINVAL;
1171 
1172 		if (container->def_window_pending && !remove.start_addr) {
1173 			container->def_window_pending = false;
1174 			return 0;
1175 		}
1176 
1177 		mutex_lock(&container->lock);
1178 
1179 		ret = tce_iommu_remove_window(container, remove.start_addr);
1180 
1181 		mutex_unlock(&container->lock);
1182 
1183 		return ret;
1184 	}
1185 	}
1186 
1187 	return -ENOTTY;
1188 }
1189 
1190 static void tce_iommu_release_ownership(struct tce_container *container,
1191 		struct iommu_table_group *table_group)
1192 {
1193 	int i;
1194 
1195 	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1196 		struct iommu_table *tbl = container->tables[i];
1197 
1198 		if (!tbl)
1199 			continue;
1200 
1201 		tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
1202 		tce_iommu_userspace_view_free(tbl, container->mm);
1203 		if (tbl->it_map)
1204 			iommu_release_ownership(tbl);
1205 
1206 		container->tables[i] = NULL;
1207 	}
1208 }
1209 
1210 static int tce_iommu_take_ownership(struct tce_container *container,
1211 		struct iommu_table_group *table_group)
1212 {
1213 	int i, j, rc = 0;
1214 
1215 	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1216 		struct iommu_table *tbl = table_group->tables[i];
1217 
1218 		if (!tbl || !tbl->it_map)
1219 			continue;
1220 
1221 		rc = iommu_take_ownership(tbl);
1222 		if (rc) {
1223 			for (j = 0; j < i; ++j)
1224 				iommu_release_ownership(
1225 						table_group->tables[j]);
1226 
1227 			return rc;
1228 		}
1229 	}
1230 
1231 	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1232 		container->tables[i] = table_group->tables[i];
1233 
1234 	return 0;
1235 }
1236 
1237 static void tce_iommu_release_ownership_ddw(struct tce_container *container,
1238 		struct iommu_table_group *table_group)
1239 {
1240 	long i;
1241 
1242 	if (!table_group->ops->unset_window) {
1243 		WARN_ON_ONCE(1);
1244 		return;
1245 	}
1246 
1247 	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1248 		table_group->ops->unset_window(table_group, i);
1249 
1250 	table_group->ops->release_ownership(table_group);
1251 }
1252 
1253 static long tce_iommu_take_ownership_ddw(struct tce_container *container,
1254 		struct iommu_table_group *table_group)
1255 {
1256 	long i, ret = 0;
1257 
1258 	if (!table_group->ops->create_table || !table_group->ops->set_window ||
1259 			!table_group->ops->release_ownership) {
1260 		WARN_ON_ONCE(1);
1261 		return -EFAULT;
1262 	}
1263 
1264 	table_group->ops->take_ownership(table_group);
1265 
1266 	/* Set all windows to the new group */
1267 	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
1268 		struct iommu_table *tbl = container->tables[i];
1269 
1270 		if (!tbl)
1271 			continue;
1272 
1273 		ret = table_group->ops->set_window(table_group, i, tbl);
1274 		if (ret)
1275 			goto release_exit;
1276 	}
1277 
1278 	return 0;
1279 
1280 release_exit:
1281 	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
1282 		table_group->ops->unset_window(table_group, i);
1283 
1284 	table_group->ops->release_ownership(table_group);
1285 
1286 	return ret;
1287 }
1288 
1289 static int tce_iommu_attach_group(void *iommu_data,
1290 		struct iommu_group *iommu_group)
1291 {
1292 	int ret;
1293 	struct tce_container *container = iommu_data;
1294 	struct iommu_table_group *table_group;
1295 	struct tce_iommu_group *tcegrp = NULL;
1296 
1297 	mutex_lock(&container->lock);
1298 
1299 	/* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n",
1300 			iommu_group_id(iommu_group), iommu_group); */
1301 	table_group = iommu_group_get_iommudata(iommu_group);
1302 	if (!table_group) {
1303 		ret = -ENODEV;
1304 		goto unlock_exit;
1305 	}
1306 
1307 	if (tce_groups_attached(container) && (!table_group->ops ||
1308 			!table_group->ops->take_ownership ||
1309 			!table_group->ops->release_ownership)) {
1310 		ret = -EBUSY;
1311 		goto unlock_exit;
1312 	}
1313 
1314 	/* Check if new group has the same iommu_ops (i.e. compatible) */
1315 	list_for_each_entry(tcegrp, &container->group_list, next) {
1316 		struct iommu_table_group *table_group_tmp;
1317 
1318 		if (tcegrp->grp == iommu_group) {
1319 			pr_warn("tce_vfio: Group %d is already attached\n",
1320 					iommu_group_id(iommu_group));
1321 			ret = -EBUSY;
1322 			goto unlock_exit;
1323 		}
1324 		table_group_tmp = iommu_group_get_iommudata(tcegrp->grp);
1325 		if (table_group_tmp->ops->create_table !=
1326 				table_group->ops->create_table) {
1327 			pr_warn("tce_vfio: Group %d is incompatible with group %d\n",
1328 					iommu_group_id(iommu_group),
1329 					iommu_group_id(tcegrp->grp));
1330 			ret = -EPERM;
1331 			goto unlock_exit;
1332 		}
1333 	}
1334 
1335 	tcegrp = kzalloc(sizeof(*tcegrp), GFP_KERNEL);
1336 	if (!tcegrp) {
1337 		ret = -ENOMEM;
1338 		goto unlock_exit;
1339 	}
1340 
1341 	if (!table_group->ops || !table_group->ops->take_ownership ||
1342 			!table_group->ops->release_ownership) {
1343 		if (container->v2) {
1344 			ret = -EPERM;
1345 			goto unlock_exit;
1346 		}
1347 		ret = tce_iommu_take_ownership(container, table_group);
1348 	} else {
1349 		if (!container->v2) {
1350 			ret = -EPERM;
1351 			goto unlock_exit;
1352 		}
1353 		ret = tce_iommu_take_ownership_ddw(container, table_group);
1354 		if (!tce_groups_attached(container) && !container->tables[0])
1355 			container->def_window_pending = true;
1356 	}
1357 
1358 	if (!ret) {
1359 		tcegrp->grp = iommu_group;
1360 		list_add(&tcegrp->next, &container->group_list);
1361 	}
1362 
1363 unlock_exit:
1364 	if (ret && tcegrp)
1365 		kfree(tcegrp);
1366 
1367 	mutex_unlock(&container->lock);
1368 
1369 	return ret;
1370 }
1371 
1372 static void tce_iommu_detach_group(void *iommu_data,
1373 		struct iommu_group *iommu_group)
1374 {
1375 	struct tce_container *container = iommu_data;
1376 	struct iommu_table_group *table_group;
1377 	bool found = false;
1378 	struct tce_iommu_group *tcegrp;
1379 
1380 	mutex_lock(&container->lock);
1381 
1382 	list_for_each_entry(tcegrp, &container->group_list, next) {
1383 		if (tcegrp->grp == iommu_group) {
1384 			found = true;
1385 			break;
1386 		}
1387 	}
1388 
1389 	if (!found) {
1390 		pr_warn("tce_vfio: detaching unattached group #%u\n",
1391 				iommu_group_id(iommu_group));
1392 		goto unlock_exit;
1393 	}
1394 
1395 	list_del(&tcegrp->next);
1396 	kfree(tcegrp);
1397 
1398 	table_group = iommu_group_get_iommudata(iommu_group);
1399 	BUG_ON(!table_group);
1400 
1401 	if (!table_group->ops || !table_group->ops->release_ownership)
1402 		tce_iommu_release_ownership(container, table_group);
1403 	else
1404 		tce_iommu_release_ownership_ddw(container, table_group);
1405 
1406 unlock_exit:
1407 	mutex_unlock(&container->lock);
1408 }
1409 
1410 const struct vfio_iommu_driver_ops tce_iommu_driver_ops = {
1411 	.name		= "iommu-vfio-powerpc",
1412 	.owner		= THIS_MODULE,
1413 	.open		= tce_iommu_open,
1414 	.release	= tce_iommu_release,
1415 	.ioctl		= tce_iommu_ioctl,
1416 	.attach_group	= tce_iommu_attach_group,
1417 	.detach_group	= tce_iommu_detach_group,
1418 };
1419 
1420 static int __init tce_iommu_init(void)
1421 {
1422 	return vfio_register_iommu_driver(&tce_iommu_driver_ops);
1423 }
1424 
1425 static void __exit tce_iommu_cleanup(void)
1426 {
1427 	vfio_unregister_iommu_driver(&tce_iommu_driver_ops);
1428 }
1429 
1430 module_init(tce_iommu_init);
1431 module_exit(tce_iommu_cleanup);
1432 
1433 MODULE_VERSION(DRIVER_VERSION);
1434 MODULE_LICENSE("GPL v2");
1435 MODULE_AUTHOR(DRIVER_AUTHOR);
1436 MODULE_DESCRIPTION(DRIVER_DESC);
1437 
1438