d9dfb5e622
For the fault-capable hwpts, the iommufd_hwpt_detach_device() calls both iommufd_fault_domain_detach_dev() and iommu_detach_group(). This would have duplicated __iommu_group_set_core_domain() call since both functions call it in the end. This looks no harm as the __iommu_group_set_core_domain() returns if the new domain equals to the existing one. But it makes sense to avoid such duplicated calls in caller side. Link: https://patch.msgid.link/r/20240908114256.979518-2-yi.l.liu@intel.com Signed-off-by: Yi Liu <yi.l.liu@intel.com> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
564 lines
18 KiB
C
564 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES
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*/
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#ifndef __IOMMUFD_PRIVATE_H
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#define __IOMMUFD_PRIVATE_H
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#include <linux/iommu.h>
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#include <linux/iova_bitmap.h>
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#include <linux/refcount.h>
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#include <linux/rwsem.h>
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#include <linux/uaccess.h>
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#include <linux/xarray.h>
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#include <uapi/linux/iommufd.h>
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#include "../iommu-priv.h"
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struct iommu_domain;
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struct iommu_group;
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struct iommu_option;
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struct iommufd_device;
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struct iommufd_ctx {
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struct file *file;
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struct xarray objects;
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struct xarray groups;
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wait_queue_head_t destroy_wait;
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u8 account_mode;
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/* Compatibility with VFIO no iommu */
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u8 no_iommu_mode;
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struct iommufd_ioas *vfio_ioas;
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};
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/*
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* The IOVA to PFN map. The map automatically copies the PFNs into multiple
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* domains and permits sharing of PFNs between io_pagetable instances. This
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* supports both a design where IOAS's are 1:1 with a domain (eg because the
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* domain is HW customized), or where the IOAS is 1:N with multiple generic
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* domains. The io_pagetable holds an interval tree of iopt_areas which point
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* to shared iopt_pages which hold the pfns mapped to the page table.
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*
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* The locking order is domains_rwsem -> iova_rwsem -> pages::mutex
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*/
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struct io_pagetable {
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struct rw_semaphore domains_rwsem;
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struct xarray domains;
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struct xarray access_list;
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unsigned int next_domain_id;
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struct rw_semaphore iova_rwsem;
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struct rb_root_cached area_itree;
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/* IOVA that cannot become reserved, struct iopt_allowed */
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struct rb_root_cached allowed_itree;
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/* IOVA that cannot be allocated, struct iopt_reserved */
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struct rb_root_cached reserved_itree;
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u8 disable_large_pages;
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unsigned long iova_alignment;
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};
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void iopt_init_table(struct io_pagetable *iopt);
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void iopt_destroy_table(struct io_pagetable *iopt);
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int iopt_get_pages(struct io_pagetable *iopt, unsigned long iova,
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unsigned long length, struct list_head *pages_list);
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void iopt_free_pages_list(struct list_head *pages_list);
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enum {
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IOPT_ALLOC_IOVA = 1 << 0,
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};
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int iopt_map_user_pages(struct iommufd_ctx *ictx, struct io_pagetable *iopt,
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unsigned long *iova, void __user *uptr,
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unsigned long length, int iommu_prot,
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unsigned int flags);
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int iopt_map_pages(struct io_pagetable *iopt, struct list_head *pages_list,
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unsigned long length, unsigned long *dst_iova,
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int iommu_prot, unsigned int flags);
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int iopt_unmap_iova(struct io_pagetable *iopt, unsigned long iova,
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unsigned long length, unsigned long *unmapped);
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int iopt_unmap_all(struct io_pagetable *iopt, unsigned long *unmapped);
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int iopt_read_and_clear_dirty_data(struct io_pagetable *iopt,
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struct iommu_domain *domain,
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unsigned long flags,
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struct iommu_hwpt_get_dirty_bitmap *bitmap);
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int iopt_set_dirty_tracking(struct io_pagetable *iopt,
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struct iommu_domain *domain, bool enable);
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void iommufd_access_notify_unmap(struct io_pagetable *iopt, unsigned long iova,
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unsigned long length);
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int iopt_table_add_domain(struct io_pagetable *iopt,
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struct iommu_domain *domain);
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void iopt_table_remove_domain(struct io_pagetable *iopt,
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struct iommu_domain *domain);
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int iopt_table_enforce_dev_resv_regions(struct io_pagetable *iopt,
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struct device *dev,
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phys_addr_t *sw_msi_start);
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int iopt_set_allow_iova(struct io_pagetable *iopt,
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struct rb_root_cached *allowed_iova);
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int iopt_reserve_iova(struct io_pagetable *iopt, unsigned long start,
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unsigned long last, void *owner);
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void iopt_remove_reserved_iova(struct io_pagetable *iopt, void *owner);
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int iopt_cut_iova(struct io_pagetable *iopt, unsigned long *iovas,
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size_t num_iovas);
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void iopt_enable_large_pages(struct io_pagetable *iopt);
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int iopt_disable_large_pages(struct io_pagetable *iopt);
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struct iommufd_ucmd {
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struct iommufd_ctx *ictx;
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void __user *ubuffer;
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u32 user_size;
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void *cmd;
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};
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int iommufd_vfio_ioctl(struct iommufd_ctx *ictx, unsigned int cmd,
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unsigned long arg);
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/* Copy the response in ucmd->cmd back to userspace. */
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static inline int iommufd_ucmd_respond(struct iommufd_ucmd *ucmd,
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size_t cmd_len)
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{
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if (copy_to_user(ucmd->ubuffer, ucmd->cmd,
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min_t(size_t, ucmd->user_size, cmd_len)))
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return -EFAULT;
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return 0;
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}
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enum iommufd_object_type {
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IOMMUFD_OBJ_NONE,
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IOMMUFD_OBJ_ANY = IOMMUFD_OBJ_NONE,
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IOMMUFD_OBJ_DEVICE,
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IOMMUFD_OBJ_HWPT_PAGING,
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IOMMUFD_OBJ_HWPT_NESTED,
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IOMMUFD_OBJ_IOAS,
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IOMMUFD_OBJ_ACCESS,
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IOMMUFD_OBJ_FAULT,
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#ifdef CONFIG_IOMMUFD_TEST
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IOMMUFD_OBJ_SELFTEST,
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#endif
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IOMMUFD_OBJ_MAX,
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};
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/* Base struct for all objects with a userspace ID handle. */
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struct iommufd_object {
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refcount_t shortterm_users;
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refcount_t users;
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enum iommufd_object_type type;
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unsigned int id;
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};
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static inline bool iommufd_lock_obj(struct iommufd_object *obj)
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{
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if (!refcount_inc_not_zero(&obj->users))
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return false;
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if (!refcount_inc_not_zero(&obj->shortterm_users)) {
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/*
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* If the caller doesn't already have a ref on obj this must be
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* called under the xa_lock. Otherwise the caller is holding a
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* ref on users. Thus it cannot be one before this decrement.
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*/
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refcount_dec(&obj->users);
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return false;
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}
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return true;
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}
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struct iommufd_object *iommufd_get_object(struct iommufd_ctx *ictx, u32 id,
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enum iommufd_object_type type);
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static inline void iommufd_put_object(struct iommufd_ctx *ictx,
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struct iommufd_object *obj)
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{
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/*
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* Users first, then shortterm so that REMOVE_WAIT_SHORTTERM never sees
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* a spurious !0 users with a 0 shortterm_users.
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*/
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refcount_dec(&obj->users);
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if (refcount_dec_and_test(&obj->shortterm_users))
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wake_up_interruptible_all(&ictx->destroy_wait);
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}
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void iommufd_object_abort(struct iommufd_ctx *ictx, struct iommufd_object *obj);
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void iommufd_object_abort_and_destroy(struct iommufd_ctx *ictx,
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struct iommufd_object *obj);
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void iommufd_object_finalize(struct iommufd_ctx *ictx,
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struct iommufd_object *obj);
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enum {
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REMOVE_WAIT_SHORTTERM = 1,
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};
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int iommufd_object_remove(struct iommufd_ctx *ictx,
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struct iommufd_object *to_destroy, u32 id,
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unsigned int flags);
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/*
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* The caller holds a users refcount and wants to destroy the object. At this
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* point the caller has no shortterm_users reference and at least the xarray
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* will be holding one.
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*/
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static inline void iommufd_object_destroy_user(struct iommufd_ctx *ictx,
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struct iommufd_object *obj)
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{
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int ret;
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ret = iommufd_object_remove(ictx, obj, obj->id, REMOVE_WAIT_SHORTTERM);
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/*
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* If there is a bug and we couldn't destroy the object then we did put
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* back the caller's users refcount and will eventually try to free it
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* again during close.
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*/
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WARN_ON(ret);
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}
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/*
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* The HWPT allocated by autodomains is used in possibly many devices and
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* is automatically destroyed when its refcount reaches zero.
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*
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* If userspace uses the HWPT manually, even for a short term, then it will
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* disrupt this refcounting and the auto-free in the kernel will not work.
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* Userspace that tries to use the automatically allocated HWPT must be careful
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* to ensure that it is consistently destroyed, eg by not racing accesses
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* and by not attaching an automatic HWPT to a device manually.
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*/
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static inline void
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iommufd_object_put_and_try_destroy(struct iommufd_ctx *ictx,
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struct iommufd_object *obj)
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{
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iommufd_object_remove(ictx, obj, obj->id, 0);
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}
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struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx,
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size_t size,
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enum iommufd_object_type type);
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#define __iommufd_object_alloc(ictx, ptr, type, obj) \
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container_of(_iommufd_object_alloc( \
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ictx, \
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sizeof(*(ptr)) + BUILD_BUG_ON_ZERO( \
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offsetof(typeof(*(ptr)), \
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obj) != 0), \
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type), \
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typeof(*(ptr)), obj)
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#define iommufd_object_alloc(ictx, ptr, type) \
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__iommufd_object_alloc(ictx, ptr, type, obj)
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/*
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* The IO Address Space (IOAS) pagetable is a virtual page table backed by the
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* io_pagetable object. It is a user controlled mapping of IOVA -> PFNs. The
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* mapping is copied into all of the associated domains and made available to
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* in-kernel users.
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*
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* Every iommu_domain that is created is wrapped in a iommufd_hw_pagetable
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* object. When we go to attach a device to an IOAS we need to get an
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* iommu_domain and wrapping iommufd_hw_pagetable for it.
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*
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* An iommu_domain & iommfd_hw_pagetable will be automatically selected
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* for a device based on the hwpt_list. If no suitable iommu_domain
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* is found a new iommu_domain will be created.
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*/
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struct iommufd_ioas {
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struct iommufd_object obj;
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struct io_pagetable iopt;
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struct mutex mutex;
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struct list_head hwpt_list;
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};
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static inline struct iommufd_ioas *iommufd_get_ioas(struct iommufd_ctx *ictx,
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u32 id)
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{
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return container_of(iommufd_get_object(ictx, id,
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IOMMUFD_OBJ_IOAS),
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struct iommufd_ioas, obj);
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}
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struct iommufd_ioas *iommufd_ioas_alloc(struct iommufd_ctx *ictx);
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int iommufd_ioas_alloc_ioctl(struct iommufd_ucmd *ucmd);
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void iommufd_ioas_destroy(struct iommufd_object *obj);
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int iommufd_ioas_iova_ranges(struct iommufd_ucmd *ucmd);
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int iommufd_ioas_allow_iovas(struct iommufd_ucmd *ucmd);
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int iommufd_ioas_map(struct iommufd_ucmd *ucmd);
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int iommufd_ioas_copy(struct iommufd_ucmd *ucmd);
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int iommufd_ioas_unmap(struct iommufd_ucmd *ucmd);
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int iommufd_ioas_option(struct iommufd_ucmd *ucmd);
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int iommufd_option_rlimit_mode(struct iommu_option *cmd,
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struct iommufd_ctx *ictx);
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int iommufd_vfio_ioas(struct iommufd_ucmd *ucmd);
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int iommufd_check_iova_range(struct io_pagetable *iopt,
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struct iommu_hwpt_get_dirty_bitmap *bitmap);
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/*
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* A HW pagetable is called an iommu_domain inside the kernel. This user object
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* allows directly creating and inspecting the domains. Domains that have kernel
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* owned page tables will be associated with an iommufd_ioas that provides the
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* IOVA to PFN map.
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*/
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struct iommufd_hw_pagetable {
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struct iommufd_object obj;
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struct iommu_domain *domain;
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struct iommufd_fault *fault;
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};
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struct iommufd_hwpt_paging {
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struct iommufd_hw_pagetable common;
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struct iommufd_ioas *ioas;
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bool auto_domain : 1;
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bool enforce_cache_coherency : 1;
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bool msi_cookie : 1;
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bool nest_parent : 1;
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/* Head at iommufd_ioas::hwpt_list */
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struct list_head hwpt_item;
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};
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struct iommufd_hwpt_nested {
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struct iommufd_hw_pagetable common;
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struct iommufd_hwpt_paging *parent;
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};
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static inline bool hwpt_is_paging(struct iommufd_hw_pagetable *hwpt)
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{
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return hwpt->obj.type == IOMMUFD_OBJ_HWPT_PAGING;
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}
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static inline struct iommufd_hwpt_paging *
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to_hwpt_paging(struct iommufd_hw_pagetable *hwpt)
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{
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return container_of(hwpt, struct iommufd_hwpt_paging, common);
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}
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static inline struct iommufd_hwpt_nested *
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to_hwpt_nested(struct iommufd_hw_pagetable *hwpt)
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{
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return container_of(hwpt, struct iommufd_hwpt_nested, common);
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}
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static inline struct iommufd_hwpt_paging *
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find_hwpt_paging(struct iommufd_hw_pagetable *hwpt)
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{
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switch (hwpt->obj.type) {
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case IOMMUFD_OBJ_HWPT_PAGING:
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return to_hwpt_paging(hwpt);
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case IOMMUFD_OBJ_HWPT_NESTED:
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return to_hwpt_nested(hwpt)->parent;
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default:
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return NULL;
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}
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}
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static inline struct iommufd_hwpt_paging *
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iommufd_get_hwpt_paging(struct iommufd_ucmd *ucmd, u32 id)
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{
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return container_of(iommufd_get_object(ucmd->ictx, id,
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IOMMUFD_OBJ_HWPT_PAGING),
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struct iommufd_hwpt_paging, common.obj);
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}
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static inline struct iommufd_hw_pagetable *
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iommufd_get_hwpt_nested(struct iommufd_ucmd *ucmd, u32 id)
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{
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return container_of(iommufd_get_object(ucmd->ictx, id,
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IOMMUFD_OBJ_HWPT_NESTED),
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struct iommufd_hw_pagetable, obj);
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}
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int iommufd_hwpt_set_dirty_tracking(struct iommufd_ucmd *ucmd);
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int iommufd_hwpt_get_dirty_bitmap(struct iommufd_ucmd *ucmd);
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struct iommufd_hwpt_paging *
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iommufd_hwpt_paging_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
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struct iommufd_device *idev, u32 flags,
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bool immediate_attach,
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const struct iommu_user_data *user_data);
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int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt,
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struct iommufd_device *idev);
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struct iommufd_hw_pagetable *
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iommufd_hw_pagetable_detach(struct iommufd_device *idev);
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void iommufd_hwpt_paging_destroy(struct iommufd_object *obj);
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void iommufd_hwpt_paging_abort(struct iommufd_object *obj);
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void iommufd_hwpt_nested_destroy(struct iommufd_object *obj);
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void iommufd_hwpt_nested_abort(struct iommufd_object *obj);
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int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd);
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int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd);
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static inline void iommufd_hw_pagetable_put(struct iommufd_ctx *ictx,
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struct iommufd_hw_pagetable *hwpt)
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{
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if (hwpt->obj.type == IOMMUFD_OBJ_HWPT_PAGING) {
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struct iommufd_hwpt_paging *hwpt_paging = to_hwpt_paging(hwpt);
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lockdep_assert_not_held(&hwpt_paging->ioas->mutex);
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if (hwpt_paging->auto_domain) {
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iommufd_object_put_and_try_destroy(ictx, &hwpt->obj);
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return;
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}
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}
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refcount_dec(&hwpt->obj.users);
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}
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struct iommufd_group {
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struct kref ref;
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struct mutex lock;
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struct iommufd_ctx *ictx;
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struct iommu_group *group;
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struct iommufd_hw_pagetable *hwpt;
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struct list_head device_list;
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phys_addr_t sw_msi_start;
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};
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/*
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* A iommufd_device object represents the binding relationship between a
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* consuming driver and the iommufd. These objects are created/destroyed by
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* external drivers, not by userspace.
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*/
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struct iommufd_device {
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struct iommufd_object obj;
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struct iommufd_ctx *ictx;
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struct iommufd_group *igroup;
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struct list_head group_item;
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/* always the physical device */
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struct device *dev;
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bool enforce_cache_coherency;
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/* protect iopf_enabled counter */
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struct mutex iopf_lock;
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unsigned int iopf_enabled;
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};
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static inline struct iommufd_device *
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iommufd_get_device(struct iommufd_ucmd *ucmd, u32 id)
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{
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return container_of(iommufd_get_object(ucmd->ictx, id,
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IOMMUFD_OBJ_DEVICE),
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struct iommufd_device, obj);
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}
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|
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void iommufd_device_destroy(struct iommufd_object *obj);
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|
int iommufd_get_hw_info(struct iommufd_ucmd *ucmd);
|
|
|
|
struct iommufd_access {
|
|
struct iommufd_object obj;
|
|
struct iommufd_ctx *ictx;
|
|
struct iommufd_ioas *ioas;
|
|
struct iommufd_ioas *ioas_unpin;
|
|
struct mutex ioas_lock;
|
|
const struct iommufd_access_ops *ops;
|
|
void *data;
|
|
unsigned long iova_alignment;
|
|
u32 iopt_access_list_id;
|
|
};
|
|
|
|
int iopt_add_access(struct io_pagetable *iopt, struct iommufd_access *access);
|
|
void iopt_remove_access(struct io_pagetable *iopt,
|
|
struct iommufd_access *access,
|
|
u32 iopt_access_list_id);
|
|
void iommufd_access_destroy_object(struct iommufd_object *obj);
|
|
|
|
/*
|
|
* An iommufd_fault object represents an interface to deliver I/O page faults
|
|
* to the user space. These objects are created/destroyed by the user space and
|
|
* associated with hardware page table objects during page-table allocation.
|
|
*/
|
|
struct iommufd_fault {
|
|
struct iommufd_object obj;
|
|
struct iommufd_ctx *ictx;
|
|
struct file *filep;
|
|
|
|
/* The lists of outstanding faults protected by below mutex. */
|
|
struct mutex mutex;
|
|
struct list_head deliver;
|
|
struct xarray response;
|
|
|
|
struct wait_queue_head wait_queue;
|
|
};
|
|
|
|
struct iommufd_attach_handle {
|
|
struct iommu_attach_handle handle;
|
|
struct iommufd_device *idev;
|
|
};
|
|
|
|
/* Convert an iommu attach handle to iommufd handle. */
|
|
#define to_iommufd_handle(hdl) container_of(hdl, struct iommufd_attach_handle, handle)
|
|
|
|
static inline struct iommufd_fault *
|
|
iommufd_get_fault(struct iommufd_ucmd *ucmd, u32 id)
|
|
{
|
|
return container_of(iommufd_get_object(ucmd->ictx, id,
|
|
IOMMUFD_OBJ_FAULT),
|
|
struct iommufd_fault, obj);
|
|
}
|
|
|
|
int iommufd_fault_alloc(struct iommufd_ucmd *ucmd);
|
|
void iommufd_fault_destroy(struct iommufd_object *obj);
|
|
int iommufd_fault_iopf_handler(struct iopf_group *group);
|
|
|
|
int iommufd_fault_domain_attach_dev(struct iommufd_hw_pagetable *hwpt,
|
|
struct iommufd_device *idev);
|
|
void iommufd_fault_domain_detach_dev(struct iommufd_hw_pagetable *hwpt,
|
|
struct iommufd_device *idev);
|
|
int iommufd_fault_domain_replace_dev(struct iommufd_device *idev,
|
|
struct iommufd_hw_pagetable *hwpt,
|
|
struct iommufd_hw_pagetable *old);
|
|
|
|
static inline int iommufd_hwpt_attach_device(struct iommufd_hw_pagetable *hwpt,
|
|
struct iommufd_device *idev)
|
|
{
|
|
if (hwpt->fault)
|
|
return iommufd_fault_domain_attach_dev(hwpt, idev);
|
|
|
|
return iommu_attach_group(hwpt->domain, idev->igroup->group);
|
|
}
|
|
|
|
static inline void iommufd_hwpt_detach_device(struct iommufd_hw_pagetable *hwpt,
|
|
struct iommufd_device *idev)
|
|
{
|
|
if (hwpt->fault) {
|
|
iommufd_fault_domain_detach_dev(hwpt, idev);
|
|
return;
|
|
}
|
|
|
|
iommu_detach_group(hwpt->domain, idev->igroup->group);
|
|
}
|
|
|
|
static inline int iommufd_hwpt_replace_device(struct iommufd_device *idev,
|
|
struct iommufd_hw_pagetable *hwpt,
|
|
struct iommufd_hw_pagetable *old)
|
|
{
|
|
if (old->fault || hwpt->fault)
|
|
return iommufd_fault_domain_replace_dev(idev, hwpt, old);
|
|
|
|
return iommu_group_replace_domain(idev->igroup->group, hwpt->domain);
|
|
}
|
|
|
|
#ifdef CONFIG_IOMMUFD_TEST
|
|
int iommufd_test(struct iommufd_ucmd *ucmd);
|
|
void iommufd_selftest_destroy(struct iommufd_object *obj);
|
|
extern size_t iommufd_test_memory_limit;
|
|
void iommufd_test_syz_conv_iova_id(struct iommufd_ucmd *ucmd,
|
|
unsigned int ioas_id, u64 *iova, u32 *flags);
|
|
bool iommufd_should_fail(void);
|
|
int __init iommufd_test_init(void);
|
|
void iommufd_test_exit(void);
|
|
bool iommufd_selftest_is_mock_dev(struct device *dev);
|
|
#else
|
|
static inline void iommufd_test_syz_conv_iova_id(struct iommufd_ucmd *ucmd,
|
|
unsigned int ioas_id,
|
|
u64 *iova, u32 *flags)
|
|
{
|
|
}
|
|
static inline bool iommufd_should_fail(void)
|
|
{
|
|
return false;
|
|
}
|
|
static inline int __init iommufd_test_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void iommufd_test_exit(void)
|
|
{
|
|
}
|
|
static inline bool iommufd_selftest_is_mock_dev(struct device *dev)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
#endif
|