310 lines
10 KiB
C
310 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES
|
|
*/
|
|
#ifndef __IOMMUFD_PRIVATE_H
|
|
#define __IOMMUFD_PRIVATE_H
|
|
|
|
#include <linux/rwsem.h>
|
|
#include <linux/xarray.h>
|
|
#include <linux/refcount.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
struct iommu_domain;
|
|
struct iommu_group;
|
|
struct iommu_option;
|
|
|
|
struct iommufd_ctx {
|
|
struct file *file;
|
|
struct xarray objects;
|
|
|
|
u8 account_mode;
|
|
/* Compatibility with VFIO no iommu */
|
|
u8 no_iommu_mode;
|
|
struct iommufd_ioas *vfio_ioas;
|
|
};
|
|
|
|
/*
|
|
* The IOVA to PFN map. The map automatically copies the PFNs into multiple
|
|
* domains and permits sharing of PFNs between io_pagetable instances. This
|
|
* supports both a design where IOAS's are 1:1 with a domain (eg because the
|
|
* domain is HW customized), or where the IOAS is 1:N with multiple generic
|
|
* domains. The io_pagetable holds an interval tree of iopt_areas which point
|
|
* to shared iopt_pages which hold the pfns mapped to the page table.
|
|
*
|
|
* The locking order is domains_rwsem -> iova_rwsem -> pages::mutex
|
|
*/
|
|
struct io_pagetable {
|
|
struct rw_semaphore domains_rwsem;
|
|
struct xarray domains;
|
|
struct xarray access_list;
|
|
unsigned int next_domain_id;
|
|
|
|
struct rw_semaphore iova_rwsem;
|
|
struct rb_root_cached area_itree;
|
|
/* IOVA that cannot become reserved, struct iopt_allowed */
|
|
struct rb_root_cached allowed_itree;
|
|
/* IOVA that cannot be allocated, struct iopt_reserved */
|
|
struct rb_root_cached reserved_itree;
|
|
u8 disable_large_pages;
|
|
unsigned long iova_alignment;
|
|
};
|
|
|
|
void iopt_init_table(struct io_pagetable *iopt);
|
|
void iopt_destroy_table(struct io_pagetable *iopt);
|
|
int iopt_get_pages(struct io_pagetable *iopt, unsigned long iova,
|
|
unsigned long length, struct list_head *pages_list);
|
|
void iopt_free_pages_list(struct list_head *pages_list);
|
|
enum {
|
|
IOPT_ALLOC_IOVA = 1 << 0,
|
|
};
|
|
int iopt_map_user_pages(struct iommufd_ctx *ictx, struct io_pagetable *iopt,
|
|
unsigned long *iova, void __user *uptr,
|
|
unsigned long length, int iommu_prot,
|
|
unsigned int flags);
|
|
int iopt_map_pages(struct io_pagetable *iopt, struct list_head *pages_list,
|
|
unsigned long length, unsigned long *dst_iova,
|
|
int iommu_prot, unsigned int flags);
|
|
int iopt_unmap_iova(struct io_pagetable *iopt, unsigned long iova,
|
|
unsigned long length, unsigned long *unmapped);
|
|
int iopt_unmap_all(struct io_pagetable *iopt, unsigned long *unmapped);
|
|
|
|
void iommufd_access_notify_unmap(struct io_pagetable *iopt, unsigned long iova,
|
|
unsigned long length);
|
|
int iopt_table_add_domain(struct io_pagetable *iopt,
|
|
struct iommu_domain *domain);
|
|
void iopt_table_remove_domain(struct io_pagetable *iopt,
|
|
struct iommu_domain *domain);
|
|
int iopt_table_enforce_group_resv_regions(struct io_pagetable *iopt,
|
|
struct device *device,
|
|
struct iommu_group *group,
|
|
phys_addr_t *sw_msi_start);
|
|
int iopt_set_allow_iova(struct io_pagetable *iopt,
|
|
struct rb_root_cached *allowed_iova);
|
|
int iopt_reserve_iova(struct io_pagetable *iopt, unsigned long start,
|
|
unsigned long last, void *owner);
|
|
void iopt_remove_reserved_iova(struct io_pagetable *iopt, void *owner);
|
|
int iopt_cut_iova(struct io_pagetable *iopt, unsigned long *iovas,
|
|
size_t num_iovas);
|
|
void iopt_enable_large_pages(struct io_pagetable *iopt);
|
|
int iopt_disable_large_pages(struct io_pagetable *iopt);
|
|
|
|
struct iommufd_ucmd {
|
|
struct iommufd_ctx *ictx;
|
|
void __user *ubuffer;
|
|
u32 user_size;
|
|
void *cmd;
|
|
};
|
|
|
|
int iommufd_vfio_ioctl(struct iommufd_ctx *ictx, unsigned int cmd,
|
|
unsigned long arg);
|
|
|
|
/* Copy the response in ucmd->cmd back to userspace. */
|
|
static inline int iommufd_ucmd_respond(struct iommufd_ucmd *ucmd,
|
|
size_t cmd_len)
|
|
{
|
|
if (copy_to_user(ucmd->ubuffer, ucmd->cmd,
|
|
min_t(size_t, ucmd->user_size, cmd_len)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
enum iommufd_object_type {
|
|
IOMMUFD_OBJ_NONE,
|
|
IOMMUFD_OBJ_ANY = IOMMUFD_OBJ_NONE,
|
|
IOMMUFD_OBJ_DEVICE,
|
|
IOMMUFD_OBJ_HW_PAGETABLE,
|
|
IOMMUFD_OBJ_IOAS,
|
|
IOMMUFD_OBJ_ACCESS,
|
|
#ifdef CONFIG_IOMMUFD_TEST
|
|
IOMMUFD_OBJ_SELFTEST,
|
|
#endif
|
|
};
|
|
|
|
/* Base struct for all objects with a userspace ID handle. */
|
|
struct iommufd_object {
|
|
struct rw_semaphore destroy_rwsem;
|
|
refcount_t users;
|
|
enum iommufd_object_type type;
|
|
unsigned int id;
|
|
};
|
|
|
|
static inline bool iommufd_lock_obj(struct iommufd_object *obj)
|
|
{
|
|
if (!down_read_trylock(&obj->destroy_rwsem))
|
|
return false;
|
|
if (!refcount_inc_not_zero(&obj->users)) {
|
|
up_read(&obj->destroy_rwsem);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
struct iommufd_object *iommufd_get_object(struct iommufd_ctx *ictx, u32 id,
|
|
enum iommufd_object_type type);
|
|
static inline void iommufd_put_object(struct iommufd_object *obj)
|
|
{
|
|
refcount_dec(&obj->users);
|
|
up_read(&obj->destroy_rwsem);
|
|
}
|
|
|
|
/**
|
|
* iommufd_ref_to_users() - Switch from destroy_rwsem to users refcount
|
|
* protection
|
|
* @obj - Object to release
|
|
*
|
|
* Objects have two refcount protections (destroy_rwsem and the refcount_t
|
|
* users). Holding either of these will prevent the object from being destroyed.
|
|
*
|
|
* Depending on the use case, one protection or the other is appropriate. In
|
|
* most cases references are being protected by the destroy_rwsem. This allows
|
|
* orderly destruction of the object because iommufd_object_destroy_user() will
|
|
* wait for it to become unlocked. However, as a rwsem, it cannot be held across
|
|
* a system call return. So cases that have longer term needs must switch
|
|
* to the weaker users refcount_t.
|
|
*
|
|
* With users protection iommufd_object_destroy_user() will return false,
|
|
* refusing to destroy the object, causing -EBUSY to userspace.
|
|
*/
|
|
static inline void iommufd_ref_to_users(struct iommufd_object *obj)
|
|
{
|
|
up_read(&obj->destroy_rwsem);
|
|
/* iommufd_lock_obj() obtains users as well */
|
|
}
|
|
void iommufd_object_abort(struct iommufd_ctx *ictx, struct iommufd_object *obj);
|
|
void iommufd_object_abort_and_destroy(struct iommufd_ctx *ictx,
|
|
struct iommufd_object *obj);
|
|
void iommufd_object_finalize(struct iommufd_ctx *ictx,
|
|
struct iommufd_object *obj);
|
|
bool iommufd_object_destroy_user(struct iommufd_ctx *ictx,
|
|
struct iommufd_object *obj);
|
|
struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx,
|
|
size_t size,
|
|
enum iommufd_object_type type);
|
|
|
|
#define iommufd_object_alloc(ictx, ptr, type) \
|
|
container_of(_iommufd_object_alloc( \
|
|
ictx, \
|
|
sizeof(*(ptr)) + BUILD_BUG_ON_ZERO( \
|
|
offsetof(typeof(*(ptr)), \
|
|
obj) != 0), \
|
|
type), \
|
|
typeof(*(ptr)), obj)
|
|
|
|
/*
|
|
* The IO Address Space (IOAS) pagetable is a virtual page table backed by the
|
|
* io_pagetable object. It is a user controlled mapping of IOVA -> PFNs. The
|
|
* mapping is copied into all of the associated domains and made available to
|
|
* in-kernel users.
|
|
*
|
|
* Every iommu_domain that is created is wrapped in a iommufd_hw_pagetable
|
|
* object. When we go to attach a device to an IOAS we need to get an
|
|
* iommu_domain and wrapping iommufd_hw_pagetable for it.
|
|
*
|
|
* An iommu_domain & iommfd_hw_pagetable will be automatically selected
|
|
* for a device based on the hwpt_list. If no suitable iommu_domain
|
|
* is found a new iommu_domain will be created.
|
|
*/
|
|
struct iommufd_ioas {
|
|
struct iommufd_object obj;
|
|
struct io_pagetable iopt;
|
|
struct mutex mutex;
|
|
struct list_head hwpt_list;
|
|
};
|
|
|
|
static inline struct iommufd_ioas *iommufd_get_ioas(struct iommufd_ucmd *ucmd,
|
|
u32 id)
|
|
{
|
|
return container_of(iommufd_get_object(ucmd->ictx, id,
|
|
IOMMUFD_OBJ_IOAS),
|
|
struct iommufd_ioas, obj);
|
|
}
|
|
|
|
struct iommufd_ioas *iommufd_ioas_alloc(struct iommufd_ctx *ictx);
|
|
int iommufd_ioas_alloc_ioctl(struct iommufd_ucmd *ucmd);
|
|
void iommufd_ioas_destroy(struct iommufd_object *obj);
|
|
int iommufd_ioas_iova_ranges(struct iommufd_ucmd *ucmd);
|
|
int iommufd_ioas_allow_iovas(struct iommufd_ucmd *ucmd);
|
|
int iommufd_ioas_map(struct iommufd_ucmd *ucmd);
|
|
int iommufd_ioas_copy(struct iommufd_ucmd *ucmd);
|
|
int iommufd_ioas_unmap(struct iommufd_ucmd *ucmd);
|
|
int iommufd_ioas_option(struct iommufd_ucmd *ucmd);
|
|
int iommufd_option_rlimit_mode(struct iommu_option *cmd,
|
|
struct iommufd_ctx *ictx);
|
|
|
|
int iommufd_vfio_ioas(struct iommufd_ucmd *ucmd);
|
|
|
|
/*
|
|
* A HW pagetable is called an iommu_domain inside the kernel. This user object
|
|
* allows directly creating and inspecting the domains. Domains that have kernel
|
|
* owned page tables will be associated with an iommufd_ioas that provides the
|
|
* IOVA to PFN map.
|
|
*/
|
|
struct iommufd_hw_pagetable {
|
|
struct iommufd_object obj;
|
|
struct iommufd_ioas *ioas;
|
|
struct iommu_domain *domain;
|
|
bool auto_domain : 1;
|
|
bool enforce_cache_coherency : 1;
|
|
bool msi_cookie : 1;
|
|
/* Head at iommufd_ioas::hwpt_list */
|
|
struct list_head hwpt_item;
|
|
struct mutex devices_lock;
|
|
struct list_head devices;
|
|
};
|
|
|
|
struct iommufd_hw_pagetable *
|
|
iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
|
|
struct device *dev);
|
|
void iommufd_hw_pagetable_destroy(struct iommufd_object *obj);
|
|
|
|
void iommufd_device_destroy(struct iommufd_object *obj);
|
|
|
|
struct iommufd_access {
|
|
struct iommufd_object obj;
|
|
struct iommufd_ctx *ictx;
|
|
struct iommufd_ioas *ioas;
|
|
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);
|
|
void iommufd_access_destroy_object(struct iommufd_object *obj);
|
|
|
|
#ifdef CONFIG_IOMMUFD_TEST
|
|
struct iommufd_hw_pagetable *
|
|
iommufd_device_selftest_attach(struct iommufd_ctx *ictx,
|
|
struct iommufd_ioas *ioas,
|
|
struct device *mock_dev);
|
|
void iommufd_device_selftest_detach(struct iommufd_ctx *ictx,
|
|
struct iommufd_hw_pagetable *hwpt);
|
|
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);
|
|
void __init iommufd_test_init(void);
|
|
void iommufd_test_exit(void);
|
|
#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 void __init iommufd_test_init(void)
|
|
{
|
|
}
|
|
static inline void iommufd_test_exit(void)
|
|
{
|
|
}
|
|
#endif
|
|
#endif
|