2 * Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 #include <rdma/rdma_user_ioctl.h>
34 #include <rdma/uverbs_ioctl.h>
35 #include "rdma_core.h"
38 struct bundle_alloc_head {
39 struct bundle_alloc_head *next;
45 struct bundle_alloc_head alloc_head;
46 struct bundle_alloc_head *allocated_mem;
47 size_t internal_avail;
50 struct radix_tree_root *radix;
51 const struct uverbs_api_ioctl_method *method_elm;
52 void __rcu **radix_slots;
53 unsigned long radix_slots_len;
56 struct ib_uverbs_attr __user *user_attrs;
57 struct ib_uverbs_attr *uattrs;
59 DECLARE_BITMAP(uobj_finalize, UVERBS_API_ATTR_BKEY_LEN);
60 DECLARE_BITMAP(spec_finalize, UVERBS_API_ATTR_BKEY_LEN);
61 DECLARE_BITMAP(uobj_hw_obj_valid, UVERBS_API_ATTR_BKEY_LEN);
64 * Must be last. bundle ends in a flex array which overlaps
67 struct uverbs_attr_bundle bundle;
68 u64 internal_buffer[32];
72 * Each method has an absolute minimum amount of memory it needs to allocate,
73 * precompute that amount and determine if the onstack memory can be used or
74 * if allocation is need.
76 void uapi_compute_bundle_size(struct uverbs_api_ioctl_method *method_elm,
77 unsigned int num_attrs)
79 struct bundle_priv *pbundle;
81 offsetof(struct bundle_priv, internal_buffer) +
82 sizeof(*pbundle->bundle.attrs) * method_elm->key_bitmap_len +
83 sizeof(*pbundle->uattrs) * num_attrs;
85 method_elm->use_stack = bundle_size <= sizeof(*pbundle);
86 method_elm->bundle_size =
87 ALIGN(bundle_size + 256, sizeof(*pbundle->internal_buffer));
89 /* Do not want order-2 allocations for this. */
90 WARN_ON_ONCE(method_elm->bundle_size > PAGE_SIZE);
94 * uverbs_alloc() - Quickly allocate memory for use with a bundle
96 * @size: Number of bytes to allocate
97 * @flags: Allocator flags
99 * The bundle allocator is intended for allocations that are connected with
100 * processing the system call related to the bundle. The allocated memory is
101 * always freed once the system call completes, and cannot be freed any other
104 * This tries to use a small pool of pre-allocated memory for performance.
106 __malloc void *_uverbs_alloc(struct uverbs_attr_bundle *bundle, size_t size,
109 struct bundle_priv *pbundle =
110 container_of(bundle, struct bundle_priv, bundle);
114 if (check_add_overflow(size, pbundle->internal_used, &new_used))
115 return ERR_PTR(-EOVERFLOW);
117 if (new_used > pbundle->internal_avail) {
118 struct bundle_alloc_head *buf;
120 buf = kvmalloc(struct_size(buf, data, size), flags);
122 return ERR_PTR(-ENOMEM);
123 buf->next = pbundle->allocated_mem;
124 pbundle->allocated_mem = buf;
128 res = (void *)pbundle->internal_buffer + pbundle->internal_used;
129 pbundle->internal_used =
130 ALIGN(new_used, sizeof(*pbundle->internal_buffer));
131 if (want_init_on_alloc(flags))
132 memset(res, 0, size);
135 EXPORT_SYMBOL(_uverbs_alloc);
137 static bool uverbs_is_attr_cleared(const struct ib_uverbs_attr *uattr,
140 if (uattr->len > sizeof_field(struct ib_uverbs_attr, data))
141 return ib_is_buffer_cleared(u64_to_user_ptr(uattr->data) + len,
144 return !memchr_inv((const void *)&uattr->data + len,
145 0, uattr->len - len);
148 static int uverbs_set_output(const struct uverbs_attr_bundle *bundle,
149 const struct uverbs_attr *attr)
151 struct bundle_priv *pbundle =
152 container_of(bundle, struct bundle_priv, bundle);
155 flags = pbundle->uattrs[attr->ptr_attr.uattr_idx].flags |
156 UVERBS_ATTR_F_VALID_OUTPUT;
158 &pbundle->user_attrs[attr->ptr_attr.uattr_idx].flags))
163 static int uverbs_process_idrs_array(struct bundle_priv *pbundle,
164 const struct uverbs_api_attr *attr_uapi,
165 struct uverbs_objs_arr_attr *attr,
166 struct ib_uverbs_attr *uattr,
169 const struct uverbs_attr_spec *spec = &attr_uapi->spec;
175 if (uattr->attr_data.reserved)
178 if (uattr->len % sizeof(u32))
181 array_len = uattr->len / sizeof(u32);
182 if (array_len < spec->u2.objs_arr.min_len ||
183 array_len > spec->u2.objs_arr.max_len)
187 uverbs_alloc(&pbundle->bundle,
188 array_size(array_len, sizeof(*attr->uobjects)));
189 if (IS_ERR(attr->uobjects))
190 return PTR_ERR(attr->uobjects);
193 * Since idr is 4B and *uobjects is >= 4B, we can use attr->uobjects
194 * to store idrs array and avoid additional memory allocation. The
195 * idrs array is offset to the end of the uobjects array so we will be
196 * able to read idr and replace with a pointer.
198 idr_vals = (u32 *)(attr->uobjects + array_len) - array_len;
200 if (uattr->len > sizeof(uattr->data)) {
201 ret = copy_from_user(idr_vals, u64_to_user_ptr(uattr->data),
206 memcpy(idr_vals, &uattr->data, uattr->len);
209 for (i = 0; i != array_len; i++) {
210 attr->uobjects[i] = uverbs_get_uobject_from_file(
211 spec->u2.objs_arr.obj_type, spec->u2.objs_arr.access,
212 idr_vals[i], &pbundle->bundle);
213 if (IS_ERR(attr->uobjects[i])) {
214 ret = PTR_ERR(attr->uobjects[i]);
220 __set_bit(attr_bkey, pbundle->spec_finalize);
224 static void uverbs_free_idrs_array(const struct uverbs_api_attr *attr_uapi,
225 struct uverbs_objs_arr_attr *attr,
227 struct uverbs_attr_bundle *attrs)
229 const struct uverbs_attr_spec *spec = &attr_uapi->spec;
232 for (i = 0; i != attr->len; i++)
233 uverbs_finalize_object(attr->uobjects[i],
234 spec->u2.objs_arr.access, false, commit,
238 static int uverbs_process_attr(struct bundle_priv *pbundle,
239 const struct uverbs_api_attr *attr_uapi,
240 struct ib_uverbs_attr *uattr, u32 attr_bkey)
242 const struct uverbs_attr_spec *spec = &attr_uapi->spec;
243 struct uverbs_attr *e = &pbundle->bundle.attrs[attr_bkey];
244 const struct uverbs_attr_spec *val_spec = spec;
245 struct uverbs_obj_attr *o_attr;
247 switch (spec->type) {
248 case UVERBS_ATTR_TYPE_ENUM_IN:
249 if (uattr->attr_data.enum_data.elem_id >= spec->u.enum_def.num_elems)
252 if (uattr->attr_data.enum_data.reserved)
255 val_spec = &spec->u2.enum_def.ids[uattr->attr_data.enum_data.elem_id];
257 /* Currently we only support PTR_IN based enums */
258 if (val_spec->type != UVERBS_ATTR_TYPE_PTR_IN)
261 e->ptr_attr.enum_id = uattr->attr_data.enum_data.elem_id;
263 case UVERBS_ATTR_TYPE_PTR_IN:
264 /* Ensure that any data provided by userspace beyond the known
265 * struct is zero. Userspace that knows how to use some future
266 * longer struct will fail here if used with an old kernel and
267 * non-zero content, making ABI compat/discovery simpler.
269 if (uattr->len > val_spec->u.ptr.len &&
270 val_spec->zero_trailing &&
271 !uverbs_is_attr_cleared(uattr, val_spec->u.ptr.len))
275 case UVERBS_ATTR_TYPE_PTR_OUT:
276 if (uattr->len < val_spec->u.ptr.min_len ||
277 (!val_spec->zero_trailing &&
278 uattr->len > val_spec->u.ptr.len))
281 if (spec->type != UVERBS_ATTR_TYPE_ENUM_IN &&
282 uattr->attr_data.reserved)
285 e->ptr_attr.uattr_idx = uattr - pbundle->uattrs;
286 e->ptr_attr.len = uattr->len;
288 if (val_spec->alloc_and_copy && !uverbs_attr_ptr_is_inline(e)) {
291 p = uverbs_alloc(&pbundle->bundle, uattr->len);
297 if (copy_from_user(p, u64_to_user_ptr(uattr->data),
301 e->ptr_attr.data = uattr->data;
305 case UVERBS_ATTR_TYPE_IDR:
306 case UVERBS_ATTR_TYPE_FD:
307 if (uattr->attr_data.reserved)
313 o_attr = &e->obj_attr;
314 o_attr->attr_elm = attr_uapi;
317 * The type of uattr->data is u64 for UVERBS_ATTR_TYPE_IDR and
318 * s64 for UVERBS_ATTR_TYPE_FD. We can cast the u64 to s64
319 * here without caring about truncation as we know that the
320 * IDR implementation today rejects negative IDs
322 o_attr->uobject = uverbs_get_uobject_from_file(
323 spec->u.obj.obj_type, spec->u.obj.access,
324 uattr->data_s64, &pbundle->bundle);
325 if (IS_ERR(o_attr->uobject))
326 return PTR_ERR(o_attr->uobject);
327 __set_bit(attr_bkey, pbundle->uobj_finalize);
329 if (spec->u.obj.access == UVERBS_ACCESS_NEW) {
330 unsigned int uattr_idx = uattr - pbundle->uattrs;
331 s64 id = o_attr->uobject->id;
333 /* Copy the allocated id to the user-space */
334 if (put_user(id, &pbundle->user_attrs[uattr_idx].data))
340 case UVERBS_ATTR_TYPE_IDRS_ARRAY:
341 return uverbs_process_idrs_array(pbundle, attr_uapi,
342 &e->objs_arr_attr, uattr,
352 * We search the radix tree with the method prefix and now we want to fast
353 * search the suffix bits to get a particular attribute pointer. It is not
354 * totally clear to me if this breaks the radix tree encasulation or not, but
355 * it uses the iter data to determine if the method iter points at the same
356 * chunk that will store the attribute, if so it just derefs it directly. By
357 * construction in most kernel configs the method and attrs will all fit in a
358 * single radix chunk, so in most cases this will have no search. Other cases
359 * this falls back to a full search.
361 static void __rcu **uapi_get_attr_for_method(struct bundle_priv *pbundle,
366 if (likely(attr_key < pbundle->radix_slots_len)) {
369 slot = pbundle->radix_slots + attr_key;
370 entry = rcu_dereference_raw(*slot);
371 if (likely(!radix_tree_is_internal_node(entry) && entry))
375 return radix_tree_lookup_slot(pbundle->radix,
376 pbundle->method_key | attr_key);
379 static int uverbs_set_attr(struct bundle_priv *pbundle,
380 struct ib_uverbs_attr *uattr)
382 u32 attr_key = uapi_key_attr(uattr->attr_id);
383 u32 attr_bkey = uapi_bkey_attr(attr_key);
384 const struct uverbs_api_attr *attr;
388 slot = uapi_get_attr_for_method(pbundle, attr_key);
391 * Kernel does not support the attribute but user-space says it
394 if (uattr->flags & UVERBS_ATTR_F_MANDATORY)
395 return -EPROTONOSUPPORT;
398 attr = rcu_dereference_protected(*slot, true);
400 /* Reject duplicate attributes from user-space */
401 if (test_bit(attr_bkey, pbundle->bundle.attr_present))
404 ret = uverbs_process_attr(pbundle, attr, uattr, attr_bkey);
408 __set_bit(attr_bkey, pbundle->bundle.attr_present);
413 static int ib_uverbs_run_method(struct bundle_priv *pbundle,
414 unsigned int num_attrs)
416 int (*handler)(struct uverbs_attr_bundle *attrs);
417 size_t uattrs_size = array_size(sizeof(*pbundle->uattrs), num_attrs);
418 unsigned int destroy_bkey = pbundle->method_elm->destroy_bkey;
422 /* See uverbs_disassociate_api() */
423 handler = srcu_dereference(
424 pbundle->method_elm->handler,
425 &pbundle->bundle.ufile->device->disassociate_srcu);
429 pbundle->uattrs = uverbs_alloc(&pbundle->bundle, uattrs_size);
430 if (IS_ERR(pbundle->uattrs))
431 return PTR_ERR(pbundle->uattrs);
432 if (copy_from_user(pbundle->uattrs, pbundle->user_attrs, uattrs_size))
435 for (i = 0; i != num_attrs; i++) {
436 ret = uverbs_set_attr(pbundle, &pbundle->uattrs[i]);
441 /* User space did not provide all the mandatory attributes */
442 if (unlikely(!bitmap_subset(pbundle->method_elm->attr_mandatory,
443 pbundle->bundle.attr_present,
444 pbundle->method_elm->key_bitmap_len)))
447 if (pbundle->method_elm->has_udata)
448 uverbs_fill_udata(&pbundle->bundle,
449 &pbundle->bundle.driver_udata,
450 UVERBS_ATTR_UHW_IN, UVERBS_ATTR_UHW_OUT);
452 pbundle->bundle.driver_udata = (struct ib_udata){};
454 if (destroy_bkey != UVERBS_API_ATTR_BKEY_LEN) {
455 struct uverbs_obj_attr *destroy_attr =
456 &pbundle->bundle.attrs[destroy_bkey].obj_attr;
458 ret = uobj_destroy(destroy_attr->uobject, &pbundle->bundle);
461 __clear_bit(destroy_bkey, pbundle->uobj_finalize);
463 ret = handler(&pbundle->bundle);
464 uobj_put_destroy(destroy_attr->uobject);
466 ret = handler(&pbundle->bundle);
470 * Until the drivers are revised to use the bundle directly we have to
471 * assume that the driver wrote to its UHW_OUT and flag userspace
474 if (!ret && pbundle->method_elm->has_udata) {
475 const struct uverbs_attr *attr =
476 uverbs_attr_get(&pbundle->bundle, UVERBS_ATTR_UHW_OUT);
479 ret = uverbs_set_output(&pbundle->bundle, attr);
483 * EPROTONOSUPPORT is ONLY to be returned if the ioctl framework can
484 * not invoke the method because the request is not supported. No
485 * other cases should return this code.
487 if (WARN_ON_ONCE(ret == -EPROTONOSUPPORT))
493 static void bundle_destroy(struct bundle_priv *pbundle, bool commit)
495 unsigned int key_bitmap_len = pbundle->method_elm->key_bitmap_len;
496 struct bundle_alloc_head *memblock;
499 /* fast path for simple uobjects */
501 while ((i = find_next_bit(pbundle->uobj_finalize, key_bitmap_len,
502 i + 1)) < key_bitmap_len) {
503 struct uverbs_attr *attr = &pbundle->bundle.attrs[i];
505 uverbs_finalize_object(
506 attr->obj_attr.uobject,
507 attr->obj_attr.attr_elm->spec.u.obj.access,
508 test_bit(i, pbundle->uobj_hw_obj_valid),
514 while ((i = find_next_bit(pbundle->spec_finalize, key_bitmap_len,
515 i + 1)) < key_bitmap_len) {
516 struct uverbs_attr *attr = &pbundle->bundle.attrs[i];
517 const struct uverbs_api_attr *attr_uapi;
520 slot = uapi_get_attr_for_method(
522 pbundle->method_key | uapi_bkey_to_key_attr(i));
526 attr_uapi = rcu_dereference_protected(*slot, true);
528 if (attr_uapi->spec.type == UVERBS_ATTR_TYPE_IDRS_ARRAY) {
529 uverbs_free_idrs_array(attr_uapi, &attr->objs_arr_attr,
530 commit, &pbundle->bundle);
534 for (memblock = pbundle->allocated_mem; memblock;) {
535 struct bundle_alloc_head *tmp = memblock;
537 memblock = memblock->next;
542 static int ib_uverbs_cmd_verbs(struct ib_uverbs_file *ufile,
543 struct ib_uverbs_ioctl_hdr *hdr,
544 struct ib_uverbs_attr __user *user_attrs)
546 const struct uverbs_api_ioctl_method *method_elm;
547 struct uverbs_api *uapi = ufile->device->uapi;
548 struct radix_tree_iter attrs_iter;
549 struct bundle_priv *pbundle;
550 struct bundle_priv onstack;
554 if (unlikely(hdr->driver_id != uapi->driver_id))
557 slot = radix_tree_iter_lookup(
558 &uapi->radix, &attrs_iter,
559 uapi_key_obj(hdr->object_id) |
560 uapi_key_ioctl_method(hdr->method_id));
562 return -EPROTONOSUPPORT;
563 method_elm = rcu_dereference_protected(*slot, true);
565 if (!method_elm->use_stack) {
566 pbundle = kmalloc(method_elm->bundle_size, GFP_KERNEL);
569 pbundle->internal_avail =
570 method_elm->bundle_size -
571 offsetof(struct bundle_priv, internal_buffer);
572 pbundle->alloc_head.next = NULL;
573 pbundle->allocated_mem = &pbundle->alloc_head;
576 pbundle->internal_avail = sizeof(pbundle->internal_buffer);
577 pbundle->allocated_mem = NULL;
580 /* Space for the pbundle->bundle.attrs flex array */
581 pbundle->method_elm = method_elm;
582 pbundle->method_key = attrs_iter.index;
583 pbundle->bundle.ufile = ufile;
584 pbundle->bundle.context = NULL; /* only valid if bundle has uobject */
585 pbundle->radix = &uapi->radix;
586 pbundle->radix_slots = slot;
587 pbundle->radix_slots_len = radix_tree_chunk_size(&attrs_iter);
588 pbundle->user_attrs = user_attrs;
590 pbundle->internal_used = ALIGN(pbundle->method_elm->key_bitmap_len *
591 sizeof(*pbundle->bundle.attrs),
592 sizeof(*pbundle->internal_buffer));
593 memset(pbundle->bundle.attr_present, 0,
594 sizeof(pbundle->bundle.attr_present));
595 memset(pbundle->uobj_finalize, 0, sizeof(pbundle->uobj_finalize));
596 memset(pbundle->spec_finalize, 0, sizeof(pbundle->spec_finalize));
597 memset(pbundle->uobj_hw_obj_valid, 0,
598 sizeof(pbundle->uobj_hw_obj_valid));
600 ret = ib_uverbs_run_method(pbundle, hdr->num_attrs);
601 bundle_destroy(pbundle, ret == 0);
605 long ib_uverbs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
607 struct ib_uverbs_file *file = filp->private_data;
608 struct ib_uverbs_ioctl_hdr __user *user_hdr =
609 (struct ib_uverbs_ioctl_hdr __user *)arg;
610 struct ib_uverbs_ioctl_hdr hdr;
614 if (unlikely(cmd != RDMA_VERBS_IOCTL))
617 err = copy_from_user(&hdr, user_hdr, sizeof(hdr));
621 if (hdr.length > PAGE_SIZE ||
622 hdr.length != struct_size(&hdr, attrs, hdr.num_attrs))
625 if (hdr.reserved1 || hdr.reserved2)
626 return -EPROTONOSUPPORT;
628 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
629 err = ib_uverbs_cmd_verbs(file, &hdr, user_hdr->attrs);
630 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
634 int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
635 size_t idx, u64 allowed_bits)
637 const struct uverbs_attr *attr;
640 attr = uverbs_attr_get(attrs_bundle, idx);
641 /* Missing attribute means 0 flags */
648 * New userspace code should use 8 bytes to pass flags, but we
649 * transparently support old userspaces that were using 4 bytes as
652 if (attr->ptr_attr.len == 8)
653 flags = attr->ptr_attr.data;
654 else if (attr->ptr_attr.len == 4)
655 flags = *(u32 *)&attr->ptr_attr.data;
659 if (flags & ~allowed_bits)
665 EXPORT_SYMBOL(uverbs_get_flags64);
667 int uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
668 size_t idx, u64 allowed_bits)
673 ret = uverbs_get_flags64(&flags, attrs_bundle, idx, allowed_bits);
683 EXPORT_SYMBOL(uverbs_get_flags32);
686 * Fill a ib_udata struct (core or uhw) using the given attribute IDs.
687 * This is primarily used to convert the UVERBS_ATTR_UHW() into the
688 * ib_udata format used by the drivers.
690 void uverbs_fill_udata(struct uverbs_attr_bundle *bundle,
691 struct ib_udata *udata, unsigned int attr_in,
692 unsigned int attr_out)
694 struct bundle_priv *pbundle =
695 container_of(bundle, struct bundle_priv, bundle);
696 const struct uverbs_attr *in =
697 uverbs_attr_get(&pbundle->bundle, attr_in);
698 const struct uverbs_attr *out =
699 uverbs_attr_get(&pbundle->bundle, attr_out);
702 udata->inlen = in->ptr_attr.len;
703 if (uverbs_attr_ptr_is_inline(in))
705 &pbundle->user_attrs[in->ptr_attr.uattr_idx]
708 udata->inbuf = u64_to_user_ptr(in->ptr_attr.data);
715 udata->outbuf = u64_to_user_ptr(out->ptr_attr.data);
716 udata->outlen = out->ptr_attr.len;
718 udata->outbuf = NULL;
723 int uverbs_copy_to(const struct uverbs_attr_bundle *bundle, size_t idx,
724 const void *from, size_t size)
726 const struct uverbs_attr *attr = uverbs_attr_get(bundle, idx);
730 return PTR_ERR(attr);
732 min_size = min_t(size_t, attr->ptr_attr.len, size);
733 if (copy_to_user(u64_to_user_ptr(attr->ptr_attr.data), from, min_size))
736 return uverbs_set_output(bundle, attr);
738 EXPORT_SYMBOL(uverbs_copy_to);
742 * This is only used if the caller has directly used copy_to_use to write the
743 * data. It signals to user space that the buffer is filled in.
745 int uverbs_output_written(const struct uverbs_attr_bundle *bundle, size_t idx)
747 const struct uverbs_attr *attr = uverbs_attr_get(bundle, idx);
750 return PTR_ERR(attr);
752 return uverbs_set_output(bundle, attr);
755 int _uverbs_get_const(s64 *to, const struct uverbs_attr_bundle *attrs_bundle,
756 size_t idx, s64 lower_bound, u64 upper_bound,
759 const struct uverbs_attr *attr;
761 attr = uverbs_attr_get(attrs_bundle, idx);
763 if ((PTR_ERR(attr) != -ENOENT) || !def_val)
764 return PTR_ERR(attr);
768 *to = attr->ptr_attr.data;
771 if (*to < lower_bound || (*to > 0 && (u64)*to > upper_bound))
776 EXPORT_SYMBOL(_uverbs_get_const);
778 int uverbs_copy_to_struct_or_zero(const struct uverbs_attr_bundle *bundle,
779 size_t idx, const void *from, size_t size)
781 const struct uverbs_attr *attr = uverbs_attr_get(bundle, idx);
784 return PTR_ERR(attr);
786 if (size < attr->ptr_attr.len) {
787 if (clear_user(u64_to_user_ptr(attr->ptr_attr.data) + size,
788 attr->ptr_attr.len - size))
791 return uverbs_copy_to(bundle, idx, from, size);
793 EXPORT_SYMBOL(uverbs_copy_to_struct_or_zero);
795 /* Once called an abort will call through to the type's destroy_hw() */
796 void uverbs_finalize_uobj_create(const struct uverbs_attr_bundle *bundle,
799 struct bundle_priv *pbundle =
800 container_of(bundle, struct bundle_priv, bundle);
802 __set_bit(uapi_bkey_attr(uapi_key_attr(idx)),
803 pbundle->uobj_hw_obj_valid);
805 EXPORT_SYMBOL(uverbs_finalize_uobj_create);