430 lines
13 KiB
C
430 lines
13 KiB
C
/*
|
|
* Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
|
|
* Author: Joerg Roedel <joerg.roedel@amd.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifndef __LINUX_IOMMU_H
|
|
#define __LINUX_IOMMU_H
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/err.h>
|
|
#include <linux/types.h>
|
|
#include <trace/events/iommu.h>
|
|
|
|
#define IOMMU_READ (1 << 0)
|
|
#define IOMMU_WRITE (1 << 1)
|
|
#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
|
|
#define IOMMU_EXEC (1 << 3)
|
|
|
|
struct iommu_ops;
|
|
struct iommu_group;
|
|
struct bus_type;
|
|
struct device;
|
|
struct iommu_domain;
|
|
struct notifier_block;
|
|
|
|
/* iommu fault flags */
|
|
#define IOMMU_FAULT_READ 0x0
|
|
#define IOMMU_FAULT_WRITE 0x1
|
|
|
|
typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
|
|
struct device *, unsigned long, int, void *);
|
|
|
|
struct iommu_domain_geometry {
|
|
dma_addr_t aperture_start; /* First address that can be mapped */
|
|
dma_addr_t aperture_end; /* Last address that can be mapped */
|
|
bool force_aperture; /* DMA only allowed in mappable range? */
|
|
};
|
|
|
|
struct iommu_domain {
|
|
const struct iommu_ops *ops;
|
|
void *priv;
|
|
iommu_fault_handler_t handler;
|
|
void *handler_token;
|
|
struct iommu_domain_geometry geometry;
|
|
};
|
|
|
|
enum iommu_cap {
|
|
IOMMU_CAP_CACHE_COHERENCY, /* IOMMU can enforce cache coherent DMA
|
|
transactions */
|
|
IOMMU_CAP_INTR_REMAP, /* IOMMU supports interrupt isolation */
|
|
};
|
|
|
|
/*
|
|
* Following constraints are specifc to FSL_PAMUV1:
|
|
* -aperture must be power of 2, and naturally aligned
|
|
* -number of windows must be power of 2, and address space size
|
|
* of each window is determined by aperture size / # of windows
|
|
* -the actual size of the mapped region of a window must be power
|
|
* of 2 starting with 4KB and physical address must be naturally
|
|
* aligned.
|
|
* DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
|
|
* The caller can invoke iommu_domain_get_attr to check if the underlying
|
|
* iommu implementation supports these constraints.
|
|
*/
|
|
|
|
enum iommu_attr {
|
|
DOMAIN_ATTR_GEOMETRY,
|
|
DOMAIN_ATTR_PAGING,
|
|
DOMAIN_ATTR_WINDOWS,
|
|
DOMAIN_ATTR_FSL_PAMU_STASH,
|
|
DOMAIN_ATTR_FSL_PAMU_ENABLE,
|
|
DOMAIN_ATTR_FSL_PAMUV1,
|
|
DOMAIN_ATTR_NESTING, /* two stages of translation */
|
|
DOMAIN_ATTR_MAX,
|
|
};
|
|
|
|
#ifdef CONFIG_IOMMU_API
|
|
|
|
/**
|
|
* struct iommu_ops - iommu ops and capabilities
|
|
* @domain_init: init iommu domain
|
|
* @domain_destroy: destroy iommu domain
|
|
* @attach_dev: attach device to an iommu domain
|
|
* @detach_dev: detach device from an iommu domain
|
|
* @map: map a physically contiguous memory region to an iommu domain
|
|
* @unmap: unmap a physically contiguous memory region from an iommu domain
|
|
* @iova_to_phys: translate iova to physical address
|
|
* @add_device: add device to iommu grouping
|
|
* @remove_device: remove device from iommu grouping
|
|
* @domain_get_attr: Query domain attributes
|
|
* @domain_set_attr: Change domain attributes
|
|
* @pgsize_bitmap: bitmap of supported page sizes
|
|
*/
|
|
struct iommu_ops {
|
|
bool (*capable)(enum iommu_cap);
|
|
int (*domain_init)(struct iommu_domain *domain);
|
|
void (*domain_destroy)(struct iommu_domain *domain);
|
|
int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
|
|
void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
|
|
int (*map)(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot);
|
|
size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
|
|
size_t size);
|
|
phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
|
|
int (*add_device)(struct device *dev);
|
|
void (*remove_device)(struct device *dev);
|
|
int (*device_group)(struct device *dev, unsigned int *groupid);
|
|
int (*domain_get_attr)(struct iommu_domain *domain,
|
|
enum iommu_attr attr, void *data);
|
|
int (*domain_set_attr)(struct iommu_domain *domain,
|
|
enum iommu_attr attr, void *data);
|
|
|
|
/* Window handling functions */
|
|
int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
|
|
phys_addr_t paddr, u64 size, int prot);
|
|
void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
|
|
/* Set the numer of window per domain */
|
|
int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
|
|
/* Get the numer of window per domain */
|
|
u32 (*domain_get_windows)(struct iommu_domain *domain);
|
|
|
|
unsigned long pgsize_bitmap;
|
|
};
|
|
|
|
#define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */
|
|
#define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */
|
|
#define IOMMU_GROUP_NOTIFY_BIND_DRIVER 3 /* Pre Driver bind */
|
|
#define IOMMU_GROUP_NOTIFY_BOUND_DRIVER 4 /* Post Driver bind */
|
|
#define IOMMU_GROUP_NOTIFY_UNBIND_DRIVER 5 /* Pre Driver unbind */
|
|
#define IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER 6 /* Post Driver unbind */
|
|
|
|
extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
|
|
extern bool iommu_present(struct bus_type *bus);
|
|
extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
|
|
extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
|
|
extern struct iommu_group *iommu_group_get_by_id(int id);
|
|
extern void iommu_domain_free(struct iommu_domain *domain);
|
|
extern int iommu_attach_device(struct iommu_domain *domain,
|
|
struct device *dev);
|
|
extern void iommu_detach_device(struct iommu_domain *domain,
|
|
struct device *dev);
|
|
extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot);
|
|
extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
|
|
size_t size);
|
|
extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
|
|
extern void iommu_set_fault_handler(struct iommu_domain *domain,
|
|
iommu_fault_handler_t handler, void *token);
|
|
|
|
extern int iommu_attach_group(struct iommu_domain *domain,
|
|
struct iommu_group *group);
|
|
extern void iommu_detach_group(struct iommu_domain *domain,
|
|
struct iommu_group *group);
|
|
extern struct iommu_group *iommu_group_alloc(void);
|
|
extern void *iommu_group_get_iommudata(struct iommu_group *group);
|
|
extern void iommu_group_set_iommudata(struct iommu_group *group,
|
|
void *iommu_data,
|
|
void (*release)(void *iommu_data));
|
|
extern int iommu_group_set_name(struct iommu_group *group, const char *name);
|
|
extern int iommu_group_add_device(struct iommu_group *group,
|
|
struct device *dev);
|
|
extern void iommu_group_remove_device(struct device *dev);
|
|
extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
|
|
int (*fn)(struct device *, void *));
|
|
extern struct iommu_group *iommu_group_get(struct device *dev);
|
|
extern void iommu_group_put(struct iommu_group *group);
|
|
extern int iommu_group_register_notifier(struct iommu_group *group,
|
|
struct notifier_block *nb);
|
|
extern int iommu_group_unregister_notifier(struct iommu_group *group,
|
|
struct notifier_block *nb);
|
|
extern int iommu_group_id(struct iommu_group *group);
|
|
extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
|
|
|
|
extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
|
|
void *data);
|
|
extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
|
|
void *data);
|
|
struct device *iommu_device_create(struct device *parent, void *drvdata,
|
|
const struct attribute_group **groups,
|
|
const char *fmt, ...);
|
|
void iommu_device_destroy(struct device *dev);
|
|
int iommu_device_link(struct device *dev, struct device *link);
|
|
void iommu_device_unlink(struct device *dev, struct device *link);
|
|
|
|
/* Window handling function prototypes */
|
|
extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
|
|
phys_addr_t offset, u64 size,
|
|
int prot);
|
|
extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
|
|
/**
|
|
* report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
|
|
* @domain: the iommu domain where the fault has happened
|
|
* @dev: the device where the fault has happened
|
|
* @iova: the faulting address
|
|
* @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...)
|
|
*
|
|
* This function should be called by the low-level IOMMU implementations
|
|
* whenever IOMMU faults happen, to allow high-level users, that are
|
|
* interested in such events, to know about them.
|
|
*
|
|
* This event may be useful for several possible use cases:
|
|
* - mere logging of the event
|
|
* - dynamic TLB/PTE loading
|
|
* - if restarting of the faulting device is required
|
|
*
|
|
* Returns 0 on success and an appropriate error code otherwise (if dynamic
|
|
* PTE/TLB loading will one day be supported, implementations will be able
|
|
* to tell whether it succeeded or not according to this return value).
|
|
*
|
|
* Specifically, -ENOSYS is returned if a fault handler isn't installed
|
|
* (though fault handlers can also return -ENOSYS, in case they want to
|
|
* elicit the default behavior of the IOMMU drivers).
|
|
*/
|
|
static inline int report_iommu_fault(struct iommu_domain *domain,
|
|
struct device *dev, unsigned long iova, int flags)
|
|
{
|
|
int ret = -ENOSYS;
|
|
|
|
/*
|
|
* if upper layers showed interest and installed a fault handler,
|
|
* invoke it.
|
|
*/
|
|
if (domain->handler)
|
|
ret = domain->handler(domain, dev, iova, flags,
|
|
domain->handler_token);
|
|
|
|
trace_io_page_fault(dev, iova, flags);
|
|
return ret;
|
|
}
|
|
|
|
#else /* CONFIG_IOMMU_API */
|
|
|
|
struct iommu_ops {};
|
|
struct iommu_group {};
|
|
|
|
static inline bool iommu_present(struct bus_type *bus)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct iommu_group *iommu_group_get_by_id(int id)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void iommu_domain_free(struct iommu_domain *domain)
|
|
{
|
|
}
|
|
|
|
static inline int iommu_attach_device(struct iommu_domain *domain,
|
|
struct device *dev)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline void iommu_detach_device(struct iommu_domain *domain,
|
|
struct device *dev)
|
|
{
|
|
}
|
|
|
|
static inline int iommu_map(struct iommu_domain *domain, unsigned long iova,
|
|
phys_addr_t paddr, int gfp_order, int prot)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
|
|
int gfp_order)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline int iommu_domain_window_enable(struct iommu_domain *domain,
|
|
u32 wnd_nr, phys_addr_t paddr,
|
|
u64 size, int prot)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline void iommu_domain_window_disable(struct iommu_domain *domain,
|
|
u32 wnd_nr)
|
|
{
|
|
}
|
|
|
|
static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void iommu_set_fault_handler(struct iommu_domain *domain,
|
|
iommu_fault_handler_t handler, void *token)
|
|
{
|
|
}
|
|
|
|
static inline int iommu_attach_group(struct iommu_domain *domain,
|
|
struct iommu_group *group)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline void iommu_detach_group(struct iommu_domain *domain,
|
|
struct iommu_group *group)
|
|
{
|
|
}
|
|
|
|
static inline struct iommu_group *iommu_group_alloc(void)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline void *iommu_group_get_iommudata(struct iommu_group *group)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void iommu_group_set_iommudata(struct iommu_group *group,
|
|
void *iommu_data,
|
|
void (*release)(void *iommu_data))
|
|
{
|
|
}
|
|
|
|
static inline int iommu_group_set_name(struct iommu_group *group,
|
|
const char *name)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline int iommu_group_add_device(struct iommu_group *group,
|
|
struct device *dev)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline void iommu_group_remove_device(struct device *dev)
|
|
{
|
|
}
|
|
|
|
static inline int iommu_group_for_each_dev(struct iommu_group *group,
|
|
void *data,
|
|
int (*fn)(struct device *, void *))
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline struct iommu_group *iommu_group_get(struct device *dev)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void iommu_group_put(struct iommu_group *group)
|
|
{
|
|
}
|
|
|
|
static inline int iommu_group_register_notifier(struct iommu_group *group,
|
|
struct notifier_block *nb)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline int iommu_group_unregister_notifier(struct iommu_group *group,
|
|
struct notifier_block *nb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int iommu_group_id(struct iommu_group *group)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static inline int iommu_domain_get_attr(struct iommu_domain *domain,
|
|
enum iommu_attr attr, void *data)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline int iommu_domain_set_attr(struct iommu_domain *domain,
|
|
enum iommu_attr attr, void *data)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline struct device *iommu_device_create(struct device *parent,
|
|
void *drvdata,
|
|
const struct attribute_group **groups,
|
|
const char *fmt, ...)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static inline void iommu_device_destroy(struct device *dev)
|
|
{
|
|
}
|
|
|
|
static inline int iommu_device_link(struct device *dev, struct device *link)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline void iommu_device_unlink(struct device *dev, struct device *link)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_IOMMU_API */
|
|
|
|
#endif /* __LINUX_IOMMU_H */
|