360 строки
8.8 KiB
C
360 строки
8.8 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
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/*
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* Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
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*/
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#include <rdma/uverbs_ioctl.h>
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#include <rdma/rdma_user_ioctl.h>
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#include <linux/bitops.h>
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#include "rdma_core.h"
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#include "uverbs.h"
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static void *uapi_add_elm(struct uverbs_api *uapi, u32 key, size_t alloc_size)
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{
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void *elm;
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int rc;
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if (key == UVERBS_API_KEY_ERR)
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return ERR_PTR(-EOVERFLOW);
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elm = kzalloc(alloc_size, GFP_KERNEL);
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rc = radix_tree_insert(&uapi->radix, key, elm);
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if (rc) {
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kfree(elm);
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return ERR_PTR(rc);
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}
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return elm;
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}
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static int uapi_merge_method(struct uverbs_api *uapi,
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struct uverbs_api_object *obj_elm, u32 obj_key,
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const struct uverbs_method_def *method,
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bool is_driver)
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{
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u32 method_key = obj_key | uapi_key_ioctl_method(method->id);
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struct uverbs_api_ioctl_method *method_elm;
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unsigned int i;
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if (!method->attrs)
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return 0;
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method_elm = uapi_add_elm(uapi, method_key, sizeof(*method_elm));
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if (IS_ERR(method_elm)) {
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if (method_elm != ERR_PTR(-EEXIST))
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return PTR_ERR(method_elm);
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/*
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* This occurs when a driver uses ADD_UVERBS_ATTRIBUTES_SIMPLE
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*/
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if (WARN_ON(method->handler))
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return -EINVAL;
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method_elm = radix_tree_lookup(&uapi->radix, method_key);
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if (WARN_ON(!method_elm))
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return -EINVAL;
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} else {
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WARN_ON(!method->handler);
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rcu_assign_pointer(method_elm->handler, method->handler);
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if (method->handler != uverbs_destroy_def_handler)
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method_elm->driver_method = is_driver;
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}
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for (i = 0; i != method->num_attrs; i++) {
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const struct uverbs_attr_def *attr = (*method->attrs)[i];
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struct uverbs_api_attr *attr_slot;
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if (!attr)
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continue;
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/*
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* ENUM_IN contains the 'ids' pointer to the driver's .rodata,
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* so if it is specified by a driver then it always makes this
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* into a driver method.
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*/
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if (attr->attr.type == UVERBS_ATTR_TYPE_ENUM_IN)
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method_elm->driver_method |= is_driver;
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/*
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* Like other uobject based things we only support a single
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* uobject being NEW'd or DESTROY'd
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*/
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if (attr->attr.type == UVERBS_ATTR_TYPE_IDRS_ARRAY) {
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u8 access = attr->attr.u2.objs_arr.access;
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if (WARN_ON(access == UVERBS_ACCESS_NEW ||
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access == UVERBS_ACCESS_DESTROY))
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return -EINVAL;
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}
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attr_slot =
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uapi_add_elm(uapi, method_key | uapi_key_attr(attr->id),
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sizeof(*attr_slot));
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/* Attributes are not allowed to be modified by drivers */
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if (IS_ERR(attr_slot))
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return PTR_ERR(attr_slot);
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attr_slot->spec = attr->attr;
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}
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return 0;
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}
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static int uapi_merge_tree(struct uverbs_api *uapi,
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const struct uverbs_object_tree_def *tree,
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bool is_driver)
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{
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unsigned int i, j;
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int rc;
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if (!tree->objects)
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return 0;
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for (i = 0; i != tree->num_objects; i++) {
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const struct uverbs_object_def *obj = (*tree->objects)[i];
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struct uverbs_api_object *obj_elm;
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u32 obj_key;
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if (!obj)
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continue;
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obj_key = uapi_key_obj(obj->id);
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obj_elm = uapi_add_elm(uapi, obj_key, sizeof(*obj_elm));
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if (IS_ERR(obj_elm)) {
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if (obj_elm != ERR_PTR(-EEXIST))
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return PTR_ERR(obj_elm);
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/* This occurs when a driver uses ADD_UVERBS_METHODS */
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if (WARN_ON(obj->type_attrs))
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return -EINVAL;
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obj_elm = radix_tree_lookup(&uapi->radix, obj_key);
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if (WARN_ON(!obj_elm))
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return -EINVAL;
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} else {
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obj_elm->type_attrs = obj->type_attrs;
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if (obj->type_attrs) {
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obj_elm->type_class =
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obj->type_attrs->type_class;
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/*
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* Today drivers are only permitted to use
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* idr_class types. They cannot use FD types
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* because we currently have no way to revoke
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* the fops pointer after device
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* disassociation.
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*/
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if (WARN_ON(is_driver &&
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obj->type_attrs->type_class !=
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&uverbs_idr_class))
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return -EINVAL;
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}
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}
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if (!obj->methods)
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continue;
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for (j = 0; j != obj->num_methods; j++) {
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const struct uverbs_method_def *method =
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(*obj->methods)[j];
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if (!method)
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continue;
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rc = uapi_merge_method(uapi, obj_elm, obj_key, method,
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is_driver);
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if (rc)
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return rc;
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}
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}
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return 0;
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}
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static int
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uapi_finalize_ioctl_method(struct uverbs_api *uapi,
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struct uverbs_api_ioctl_method *method_elm,
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u32 method_key)
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{
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struct radix_tree_iter iter;
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unsigned int num_attrs = 0;
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unsigned int max_bkey = 0;
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bool single_uobj = false;
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void __rcu **slot;
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method_elm->destroy_bkey = UVERBS_API_ATTR_BKEY_LEN;
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radix_tree_for_each_slot (slot, &uapi->radix, &iter,
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uapi_key_attrs_start(method_key)) {
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struct uverbs_api_attr *elm =
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rcu_dereference_protected(*slot, true);
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u32 attr_key = iter.index & UVERBS_API_ATTR_KEY_MASK;
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u32 attr_bkey = uapi_bkey_attr(attr_key);
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u8 type = elm->spec.type;
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if (uapi_key_attr_to_method(iter.index) !=
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uapi_key_attr_to_method(method_key))
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break;
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if (elm->spec.mandatory)
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__set_bit(attr_bkey, method_elm->attr_mandatory);
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if (type == UVERBS_ATTR_TYPE_IDR ||
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type == UVERBS_ATTR_TYPE_FD) {
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u8 access = elm->spec.u.obj.access;
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/*
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* Verbs specs may only have one NEW/DESTROY, we don't
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* have the infrastructure to abort multiple NEW's or
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* cope with multiple DESTROY failure.
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*/
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if (access == UVERBS_ACCESS_NEW ||
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access == UVERBS_ACCESS_DESTROY) {
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if (WARN_ON(single_uobj))
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return -EINVAL;
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single_uobj = true;
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if (WARN_ON(!elm->spec.mandatory))
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return -EINVAL;
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}
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if (access == UVERBS_ACCESS_DESTROY)
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method_elm->destroy_bkey = attr_bkey;
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}
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max_bkey = max(max_bkey, attr_bkey);
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num_attrs++;
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}
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method_elm->key_bitmap_len = max_bkey + 1;
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WARN_ON(method_elm->key_bitmap_len > UVERBS_API_ATTR_BKEY_LEN);
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uapi_compute_bundle_size(method_elm, num_attrs);
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return 0;
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}
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static int uapi_finalize(struct uverbs_api *uapi)
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{
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struct radix_tree_iter iter;
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void __rcu **slot;
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int rc;
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radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) {
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struct uverbs_api_ioctl_method *method_elm =
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rcu_dereference_protected(*slot, true);
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if (uapi_key_is_ioctl_method(iter.index)) {
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rc = uapi_finalize_ioctl_method(uapi, method_elm,
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iter.index);
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if (rc)
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return rc;
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}
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}
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return 0;
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}
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void uverbs_destroy_api(struct uverbs_api *uapi)
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{
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struct radix_tree_iter iter;
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void __rcu **slot;
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if (!uapi)
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return;
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radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) {
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kfree(rcu_dereference_protected(*slot, true));
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radix_tree_iter_delete(&uapi->radix, &iter, slot);
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}
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kfree(uapi);
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}
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struct uverbs_api *uverbs_alloc_api(
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const struct uverbs_object_tree_def *const *driver_specs,
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enum rdma_driver_id driver_id)
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{
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struct uverbs_api *uapi;
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int rc;
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uapi = kzalloc(sizeof(*uapi), GFP_KERNEL);
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if (!uapi)
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return ERR_PTR(-ENOMEM);
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INIT_RADIX_TREE(&uapi->radix, GFP_KERNEL);
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uapi->driver_id = driver_id;
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rc = uapi_merge_tree(uapi, uverbs_default_get_objects(), false);
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if (rc)
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goto err;
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for (; driver_specs && *driver_specs; driver_specs++) {
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rc = uapi_merge_tree(uapi, *driver_specs, true);
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if (rc)
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goto err;
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}
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rc = uapi_finalize(uapi);
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if (rc)
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goto err;
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return uapi;
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err:
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if (rc != -ENOMEM)
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pr_err("Setup of uverbs_api failed, kernel parsing tree description is not valid (%d)??\n",
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rc);
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uverbs_destroy_api(uapi);
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return ERR_PTR(rc);
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}
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/*
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* The pre version is done before destroying the HW objects, it only blocks
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* off method access. All methods that require the ib_dev or the module data
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* must test one of these assignments prior to continuing.
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*/
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void uverbs_disassociate_api_pre(struct ib_uverbs_device *uverbs_dev)
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{
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struct uverbs_api *uapi = uverbs_dev->uapi;
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struct radix_tree_iter iter;
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void __rcu **slot;
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rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
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radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) {
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if (uapi_key_is_ioctl_method(iter.index)) {
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struct uverbs_api_ioctl_method *method_elm =
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rcu_dereference_protected(*slot, true);
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if (method_elm->driver_method)
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rcu_assign_pointer(method_elm->handler, NULL);
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}
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}
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synchronize_srcu(&uverbs_dev->disassociate_srcu);
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}
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/*
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* Called when a driver disassociates from the ib_uverbs_device. The
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* assumption is that the driver module will unload after. Replace everything
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* related to the driver with NULL as a safety measure.
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*/
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void uverbs_disassociate_api(struct uverbs_api *uapi)
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{
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struct radix_tree_iter iter;
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void __rcu **slot;
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radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) {
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if (uapi_key_is_object(iter.index)) {
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struct uverbs_api_object *object_elm =
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rcu_dereference_protected(*slot, true);
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/*
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* Some type_attrs are in the driver module. We don't
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* bother to keep track of which since there should be
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* no use of this after disassociate.
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*/
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object_elm->type_attrs = NULL;
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} else if (uapi_key_is_attr(iter.index)) {
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struct uverbs_api_attr *elm =
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rcu_dereference_protected(*slot, true);
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if (elm->spec.type == UVERBS_ATTR_TYPE_ENUM_IN)
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elm->spec.u2.enum_def.ids = NULL;
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}
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}
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}
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