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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES
*/
#include <linux/interval_tree.h>
#include <linux/iommu.h>
#include <linux/iommufd.h>
#include <uapi/linux/iommufd.h>
#include "io_pagetable.h"
void iommufd_ioas_destroy(struct iommufd_object *obj)
{
struct iommufd_ioas *ioas = container_of(obj, struct iommufd_ioas, obj);
int rc;
rc = iopt_unmap_all(&ioas->iopt, NULL);
WARN_ON(rc && rc != -ENOENT);
iopt_destroy_table(&ioas->iopt);
mutex_destroy(&ioas->mutex);
}
struct iommufd_ioas *iommufd_ioas_alloc(struct iommufd_ctx *ictx)
{
struct iommufd_ioas *ioas;
ioas = iommufd_object_alloc(ictx, ioas, IOMMUFD_OBJ_IOAS);
if (IS_ERR(ioas))
return ioas;
iopt_init_table(&ioas->iopt);
INIT_LIST_HEAD(&ioas->hwpt_list);
mutex_init(&ioas->mutex);
return ioas;
}
int iommufd_ioas_alloc_ioctl(struct iommufd_ucmd *ucmd)
{
struct iommu_ioas_alloc *cmd = ucmd->cmd;
struct iommufd_ioas *ioas;
int rc;
if (cmd->flags)
return -EOPNOTSUPP;
ioas = iommufd_ioas_alloc(ucmd->ictx);
if (IS_ERR(ioas))
return PTR_ERR(ioas);
cmd->out_ioas_id = ioas->obj.id;
rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
if (rc)
goto out_table;
iommufd_object_finalize(ucmd->ictx, &ioas->obj);
return 0;
out_table:
iommufd_object_abort_and_destroy(ucmd->ictx, &ioas->obj);
return rc;
}
int iommufd_ioas_iova_ranges(struct iommufd_ucmd *ucmd)
{
struct iommu_iova_range __user *ranges;
struct iommu_ioas_iova_ranges *cmd = ucmd->cmd;
struct iommufd_ioas *ioas;
struct interval_tree_span_iter span;
u32 max_iovas;
int rc;
if (cmd->__reserved)
return -EOPNOTSUPP;
ioas = iommufd_get_ioas(ucmd->ictx, cmd->ioas_id);
if (IS_ERR(ioas))
return PTR_ERR(ioas);
down_read(&ioas->iopt.iova_rwsem);
max_iovas = cmd->num_iovas;
ranges = u64_to_user_ptr(cmd->allowed_iovas);
cmd->num_iovas = 0;
cmd->out_iova_alignment = ioas->iopt.iova_alignment;
interval_tree_for_each_span(&span, &ioas->iopt.reserved_itree, 0,
ULONG_MAX) {
if (!span.is_hole)
continue;
if (cmd->num_iovas < max_iovas) {
struct iommu_iova_range elm = {
.start = span.start_hole,
.last = span.last_hole,
};
if (copy_to_user(&ranges[cmd->num_iovas], &elm,
sizeof(elm))) {
rc = -EFAULT;
goto out_put;
}
}
cmd->num_iovas++;
}
rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
if (rc)
goto out_put;
if (cmd->num_iovas > max_iovas)
rc = -EMSGSIZE;
out_put:
up_read(&ioas->iopt.iova_rwsem);
iommufd_put_object(ucmd->ictx, &ioas->obj);
return rc;
}
static int iommufd_ioas_load_iovas(struct rb_root_cached *itree,
struct iommu_iova_range __user *ranges,
u32 num)
{
u32 i;
for (i = 0; i != num; i++) {
struct iommu_iova_range range;
struct iopt_allowed *allowed;
if (copy_from_user(&range, ranges + i, sizeof(range)))
return -EFAULT;
if (range.start >= range.last)
return -EINVAL;
if (interval_tree_iter_first(itree, range.start, range.last))
return -EINVAL;
allowed = kzalloc(sizeof(*allowed), GFP_KERNEL_ACCOUNT);
if (!allowed)
return -ENOMEM;
allowed->node.start = range.start;
allowed->node.last = range.last;
interval_tree_insert(&allowed->node, itree);
}
return 0;
}
int iommufd_ioas_allow_iovas(struct iommufd_ucmd *ucmd)
{
struct iommu_ioas_allow_iovas *cmd = ucmd->cmd;
struct rb_root_cached allowed_iova = RB_ROOT_CACHED;
struct interval_tree_node *node;
struct iommufd_ioas *ioas;
struct io_pagetable *iopt;
int rc = 0;
if (cmd->__reserved)
return -EOPNOTSUPP;
ioas = iommufd_get_ioas(ucmd->ictx, cmd->ioas_id);
if (IS_ERR(ioas))
return PTR_ERR(ioas);
iopt = &ioas->iopt;
rc = iommufd_ioas_load_iovas(&allowed_iova,
u64_to_user_ptr(cmd->allowed_iovas),
cmd->num_iovas);
if (rc)
goto out_free;
/*
* We want the allowed tree update to be atomic, so we have to keep the
* original nodes around, and keep track of the new nodes as we allocate
* memory for them. The simplest solution is to have a new/old tree and
* then swap new for old. On success we free the old tree, on failure we
* free the new tree.
*/
rc = iopt_set_allow_iova(iopt, &allowed_iova);
out_free:
while ((node = interval_tree_iter_first(&allowed_iova, 0, ULONG_MAX))) {
interval_tree_remove(node, &allowed_iova);
kfree(container_of(node, struct iopt_allowed, node));
}
iommufd_put_object(ucmd->ictx, &ioas->obj);
return rc;
}
static int conv_iommu_prot(u32 map_flags)
{
/*
* We provide no manual cache coherency ioctls to userspace and most
* architectures make the CPU ops for cache flushing privileged.
* Therefore we require the underlying IOMMU to support CPU coherent
* operation. Support for IOMMU_CACHE is enforced by the
* IOMMU_CAP_CACHE_COHERENCY test during bind.
*/
int iommu_prot = IOMMU_CACHE;
if (map_flags & IOMMU_IOAS_MAP_WRITEABLE)
iommu_prot |= IOMMU_WRITE;
if (map_flags & IOMMU_IOAS_MAP_READABLE)
iommu_prot |= IOMMU_READ;
return iommu_prot;
}
int iommufd_ioas_map(struct iommufd_ucmd *ucmd)
{
struct iommu_ioas_map *cmd = ucmd->cmd;
unsigned long iova = cmd->iova;
struct iommufd_ioas *ioas;
unsigned int flags = 0;
int rc;
if ((cmd->flags &
~(IOMMU_IOAS_MAP_FIXED_IOVA | IOMMU_IOAS_MAP_WRITEABLE |
IOMMU_IOAS_MAP_READABLE)) ||
cmd->__reserved)
return -EOPNOTSUPP;
if (cmd->iova >= ULONG_MAX || cmd->length >= ULONG_MAX)
return -EOVERFLOW;
if (!(cmd->flags &
(IOMMU_IOAS_MAP_WRITEABLE | IOMMU_IOAS_MAP_READABLE)))
return -EINVAL;
ioas = iommufd_get_ioas(ucmd->ictx, cmd->ioas_id);
if (IS_ERR(ioas))
return PTR_ERR(ioas);
if (!(cmd->flags & IOMMU_IOAS_MAP_FIXED_IOVA))
flags = IOPT_ALLOC_IOVA;
rc = iopt_map_user_pages(ucmd->ictx, &ioas->iopt, &iova,
u64_to_user_ptr(cmd->user_va), cmd->length,
conv_iommu_prot(cmd->flags), flags);
if (rc)
goto out_put;
cmd->iova = iova;
rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
out_put:
iommufd_put_object(ucmd->ictx, &ioas->obj);
return rc;
}
int iommufd_ioas_copy(struct iommufd_ucmd *ucmd)
{
struct iommu_ioas_copy *cmd = ucmd->cmd;
struct iommufd_ioas *src_ioas;
struct iommufd_ioas *dst_ioas;
unsigned int flags = 0;
LIST_HEAD(pages_list);
unsigned long iova;
int rc;
iommufd_test_syz_conv_iova_id(ucmd, cmd->src_ioas_id, &cmd->src_iova,
&cmd->flags);
if ((cmd->flags &
~(IOMMU_IOAS_MAP_FIXED_IOVA | IOMMU_IOAS_MAP_WRITEABLE |
IOMMU_IOAS_MAP_READABLE)))
return -EOPNOTSUPP;
if (cmd->length >= ULONG_MAX || cmd->src_iova >= ULONG_MAX ||
cmd->dst_iova >= ULONG_MAX)
return -EOVERFLOW;
if (!(cmd->flags &
(IOMMU_IOAS_MAP_WRITEABLE | IOMMU_IOAS_MAP_READABLE)))
return -EINVAL;
src_ioas = iommufd_get_ioas(ucmd->ictx, cmd->src_ioas_id);
if (IS_ERR(src_ioas))
return PTR_ERR(src_ioas);
rc = iopt_get_pages(&src_ioas->iopt, cmd->src_iova, cmd->length,
&pages_list);
iommufd_put_object(ucmd->ictx, &src_ioas->obj);
if (rc)
return rc;
dst_ioas = iommufd_get_ioas(ucmd->ictx, cmd->dst_ioas_id);
if (IS_ERR(dst_ioas)) {
rc = PTR_ERR(dst_ioas);
goto out_pages;
}
if (!(cmd->flags & IOMMU_IOAS_MAP_FIXED_IOVA))
flags = IOPT_ALLOC_IOVA;
iova = cmd->dst_iova;
rc = iopt_map_pages(&dst_ioas->iopt, &pages_list, cmd->length, &iova,
conv_iommu_prot(cmd->flags), flags);
if (rc)
goto out_put_dst;
cmd->dst_iova = iova;
rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
out_put_dst:
iommufd_put_object(ucmd->ictx, &dst_ioas->obj);
out_pages:
iopt_free_pages_list(&pages_list);
return rc;
}
int iommufd_ioas_unmap(struct iommufd_ucmd *ucmd)
{
struct iommu_ioas_unmap *cmd = ucmd->cmd;
struct iommufd_ioas *ioas;
unsigned long unmapped = 0;
int rc;
ioas = iommufd_get_ioas(ucmd->ictx, cmd->ioas_id);
if (IS_ERR(ioas))
return PTR_ERR(ioas);
if (cmd->iova == 0 && cmd->length == U64_MAX) {
rc = iopt_unmap_all(&ioas->iopt, &unmapped);
if (rc)
goto out_put;
} else {
if (cmd->iova >= ULONG_MAX || cmd->length >= ULONG_MAX) {
rc = -EOVERFLOW;
goto out_put;
}
rc = iopt_unmap_iova(&ioas->iopt, cmd->iova, cmd->length,
&unmapped);
if (rc)
goto out_put;
}
cmd->length = unmapped;
rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
out_put:
iommufd_put_object(ucmd->ictx, &ioas->obj);
return rc;
}
int iommufd_option_rlimit_mode(struct iommu_option *cmd,
struct iommufd_ctx *ictx)
{
if (cmd->object_id)
return -EOPNOTSUPP;
if (cmd->op == IOMMU_OPTION_OP_GET) {
cmd->val64 = ictx->account_mode == IOPT_PAGES_ACCOUNT_MM;
return 0;
}
if (cmd->op == IOMMU_OPTION_OP_SET) {
int rc = 0;
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
xa_lock(&ictx->objects);
if (!xa_empty(&ictx->objects)) {
rc = -EBUSY;
} else {
if (cmd->val64 == 0)
ictx->account_mode = IOPT_PAGES_ACCOUNT_USER;
else if (cmd->val64 == 1)
ictx->account_mode = IOPT_PAGES_ACCOUNT_MM;
else
rc = -EINVAL;
}
xa_unlock(&ictx->objects);
return rc;
}
return -EOPNOTSUPP;
}
static int iommufd_ioas_option_huge_pages(struct iommu_option *cmd,
struct iommufd_ioas *ioas)
{
if (cmd->op == IOMMU_OPTION_OP_GET) {
cmd->val64 = !ioas->iopt.disable_large_pages;
return 0;
}
if (cmd->op == IOMMU_OPTION_OP_SET) {
if (cmd->val64 == 0)
return iopt_disable_large_pages(&ioas->iopt);
if (cmd->val64 == 1) {
iopt_enable_large_pages(&ioas->iopt);
return 0;
}
return -EINVAL;
}
return -EOPNOTSUPP;
}
int iommufd_ioas_option(struct iommufd_ucmd *ucmd)
{
struct iommu_option *cmd = ucmd->cmd;
struct iommufd_ioas *ioas;
int rc = 0;
if (cmd->__reserved)
return -EOPNOTSUPP;
ioas = iommufd_get_ioas(ucmd->ictx, cmd->object_id);
if (IS_ERR(ioas))
return PTR_ERR(ioas);
switch (cmd->option_id) {
case IOMMU_OPTION_HUGE_PAGES:
rc = iommufd_ioas_option_huge_pages(cmd, ioas);
break;
default:
rc = -EOPNOTSUPP;
}
iommufd_put_object(ucmd->ictx, &ioas->obj);
return rc;
}
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