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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
* Rewrite, cleanup:
* Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
*/
#ifndef _ASM_IOMMU_H
#define _ASM_IOMMU_H
#ifdef __KERNEL__
#include <linux/compiler.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/bitops.h>
#include <asm/machdep.h>
#include <asm/types.h>
#include <asm/pci-bridge.h>
#include <asm/asm-const.h>
#define IOMMU_PAGE_SHIFT_4K 12
#define IOMMU_PAGE_SIZE_4K (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K)
#define IOMMU_PAGE_MASK_4K (~((1 << IOMMU_PAGE_SHIFT_4K) - 1))
#define IOMMU_PAGE_ALIGN_4K(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE_4K)
#define IOMMU_PAGE_SIZE(tblptr) (ASM_CONST(1) << (tblptr)->it_page_shift)
#define IOMMU_PAGE_MASK(tblptr) (~((1 << (tblptr)->it_page_shift) - 1))
#define IOMMU_PAGE_ALIGN(addr, tblptr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE(tblptr))
/* Boot time flags */
extern int iommu_is_off;
extern int iommu_force_on;
struct iommu_table_ops {
/*
* When called with direction==DMA_NONE, it is equal to clear().
* uaddr is a linear map address.
*/
int (*set)(struct iommu_table *tbl,
long index, long npages,
unsigned long uaddr,
enum dma_data_direction direction,
unsigned long attrs);
#ifdef CONFIG_IOMMU_API
/*
* Exchanges existing TCE with new TCE plus direction bits;
* returns old TCE and DMA direction mask.
* @tce is a physical address.
*/
int (*xchg_no_kill)(struct iommu_table *tbl,
long index,
unsigned long *hpa,
enum dma_data_direction *direction,
bool realmode);
void (*tce_kill)(struct iommu_table *tbl,
unsigned long index,
unsigned long pages,
bool realmode);
__be64 *(*useraddrptr)(struct iommu_table *tbl, long index, bool alloc);
#endif
void (*clear)(struct iommu_table *tbl,
long index, long npages);
/* get() returns a physical address */
unsigned long (*get)(struct iommu_table *tbl, long index);
void (*flush)(struct iommu_table *tbl);
void (*free)(struct iommu_table *tbl);
};
/* These are used by VIO */
extern struct iommu_table_ops iommu_table_lpar_multi_ops;
extern struct iommu_table_ops iommu_table_pseries_ops;
/*
* IOMAP_MAX_ORDER defines the largest contiguous block
* of dma space we can get. IOMAP_MAX_ORDER = 13
* allows up to 2**12 pages (4096 * 4096) = 16 MB
*/
#define IOMAP_MAX_ORDER 13
#define IOMMU_POOL_HASHBITS 2
#define IOMMU_NR_POOLS (1 << IOMMU_POOL_HASHBITS)
struct iommu_pool {
unsigned long start;
unsigned long end;
unsigned long hint;
spinlock_t lock;
} ____cacheline_aligned_in_smp;
struct iommu_table {
unsigned long it_busno; /* Bus number this table belongs to */
unsigned long it_size; /* Size of iommu table in entries */
unsigned long it_indirect_levels;
unsigned long it_level_size;
unsigned long it_allocated_size;
unsigned long it_offset; /* Offset into global table */
unsigned long it_base; /* mapped address of tce table */
unsigned long it_index; /* which iommu table this is */
unsigned long it_type; /* type: PCI or Virtual Bus */
unsigned long it_blocksize; /* Entries in each block (cacheline) */
unsigned long poolsize;
unsigned long nr_pools;
struct iommu_pool large_pool;
struct iommu_pool pools[IOMMU_NR_POOLS];
unsigned long *it_map; /* A simple allocation bitmap for now */
unsigned long it_page_shift;/* table iommu page size */
struct list_head it_group_list;/* List of iommu_table_group_link */
__be64 *it_userspace; /* userspace view of the table */
struct iommu_table_ops *it_ops;
struct kref it_kref;
int it_nid;
unsigned long it_reserved_start; /* Start of not-DMA-able (MMIO) area */
unsigned long it_reserved_end;
};
#define IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry) \
((tbl)->it_ops->useraddrptr((tbl), (entry), false))
#define IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry) \
((tbl)->it_ops->useraddrptr((tbl), (entry), true))
/* Pure 2^n version of get_order */
static inline __attribute_const__
int get_iommu_order(unsigned long size, struct iommu_table *tbl)
{
return __ilog2((size - 1) >> tbl->it_page_shift) + 1;
}
struct scatterlist;
#ifdef CONFIG_PPC64
static inline void set_iommu_table_base(struct device *dev,
struct iommu_table *base)
{
dev->archdata.iommu_table_base = base;
}
static inline void *get_iommu_table_base(struct device *dev)
{
return dev->archdata.iommu_table_base;
}
extern int dma_iommu_dma_supported(struct device *dev, u64 mask);
extern struct iommu_table *iommu_tce_table_get(struct iommu_table *tbl);
extern int iommu_tce_table_put(struct iommu_table *tbl);
/* Initializes an iommu_table based in values set in the passed-in
* structure
*/
extern struct iommu_table *iommu_init_table(struct iommu_table *tbl,
int nid, unsigned long res_start, unsigned long res_end);
#define IOMMU_TABLE_GROUP_MAX_TABLES 2
struct iommu_table_group;
struct iommu_table_group_ops {
unsigned long (*get_table_size)(
__u32 page_shift,
__u64 window_size,
__u32 levels);
long (*create_table)(struct iommu_table_group *table_group,
int num,
__u32 page_shift,
__u64 window_size,
__u32 levels,
struct iommu_table **ptbl);
long (*set_window)(struct iommu_table_group *table_group,
int num,
struct iommu_table *tblnew);
long (*unset_window)(struct iommu_table_group *table_group,
int num);
/* Switch ownership from platform code to external user (e.g. VFIO) */
void (*take_ownership)(struct iommu_table_group *table_group);
/* Switch ownership from external user (e.g. VFIO) back to core */
void (*release_ownership)(struct iommu_table_group *table_group);
};
struct iommu_table_group_link {
struct list_head next;
struct rcu_head rcu;
struct iommu_table_group *table_group;
};
struct iommu_table_group {
/* IOMMU properties */
__u32 tce32_start;
__u32 tce32_size;
__u64 pgsizes; /* Bitmap of supported page sizes */
__u32 max_dynamic_windows_supported;
__u32 max_levels;
struct iommu_group *group;
struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES];
struct iommu_table_group_ops *ops;
};
#ifdef CONFIG_IOMMU_API
extern void iommu_register_group(struct iommu_table_group *table_group,
int pci_domain_number, unsigned long pe_num);
extern int iommu_add_device(struct iommu_table_group *table_group,
struct device *dev);
extern void iommu_del_device(struct device *dev);
extern long iommu_tce_xchg(struct mm_struct *mm, struct iommu_table *tbl,
unsigned long entry, unsigned long *hpa,
enum dma_data_direction *direction);
extern long iommu_tce_xchg_no_kill(struct mm_struct *mm,
struct iommu_table *tbl,
unsigned long entry, unsigned long *hpa,
enum dma_data_direction *direction);
extern void iommu_tce_kill(struct iommu_table *tbl,
unsigned long entry, unsigned long pages);
#else
static inline void iommu_register_group(struct iommu_table_group *table_group,
int pci_domain_number,
unsigned long pe_num)
{
}
static inline int iommu_add_device(struct iommu_table_group *table_group,
struct device *dev)
{
return 0;
}
static inline void iommu_del_device(struct device *dev)
{
}
#endif /* !CONFIG_IOMMU_API */
u64 dma_iommu_get_required_mask(struct device *dev);
#else
static inline void *get_iommu_table_base(struct device *dev)
{
return NULL;
}
static inline int dma_iommu_dma_supported(struct device *dev, u64 mask)
{
return 0;
}
#endif /* CONFIG_PPC64 */
extern int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
struct scatterlist *sglist, int nelems,
unsigned long mask,
enum dma_data_direction direction,
unsigned long attrs);
extern void ppc_iommu_unmap_sg(struct iommu_table *tbl,
struct scatterlist *sglist,
int nelems,
enum dma_data_direction direction,
unsigned long attrs);
extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
size_t size, dma_addr_t *dma_handle,
unsigned long mask, gfp_t flag, int node);
extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
void *vaddr, dma_addr_t dma_handle);
extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
struct page *page, unsigned long offset,
size_t size, unsigned long mask,
enum dma_data_direction direction,
unsigned long attrs);
extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle,
size_t size, enum dma_data_direction direction,
unsigned long attrs);
extern void iommu_init_early_pSeries(void);
extern void iommu_init_early_dart(struct pci_controller_ops *controller_ops);
extern void iommu_init_early_pasemi(void);
#if defined(CONFIG_PPC64) && defined(CONFIG_PM)
static inline void iommu_save(void)
{
if (ppc_md.iommu_save)
ppc_md.iommu_save();
}
static inline void iommu_restore(void)
{
if (ppc_md.iommu_restore)
ppc_md.iommu_restore();
}
#endif
/* The API to support IOMMU operations for VFIO */
extern int iommu_tce_check_ioba(unsigned long page_shift,
unsigned long offset, unsigned long size,
unsigned long ioba, unsigned long npages);
extern int iommu_tce_check_gpa(unsigned long page_shift,
unsigned long gpa);
#define iommu_tce_clear_param_check(tbl, ioba, tce_value, npages) \
(iommu_tce_check_ioba((tbl)->it_page_shift, \
(tbl)->it_offset, (tbl)->it_size, \
(ioba), (npages)) || (tce_value))
#define iommu_tce_put_param_check(tbl, ioba, gpa) \
(iommu_tce_check_ioba((tbl)->it_page_shift, \
(tbl)->it_offset, (tbl)->it_size, \
(ioba), 1) || \
iommu_tce_check_gpa((tbl)->it_page_shift, (gpa)))
extern void iommu_flush_tce(struct iommu_table *tbl);
extern int iommu_take_ownership(struct iommu_table *tbl);
extern void iommu_release_ownership(struct iommu_table *tbl);
extern enum dma_data_direction iommu_tce_direction(unsigned long tce);
extern unsigned long iommu_direction_to_tce_perm(enum dma_data_direction dir);
#ifdef CONFIG_PPC_CELL_NATIVE
extern bool iommu_fixed_is_weak;
#else
#define iommu_fixed_is_weak false
#endif
extern const struct dma_map_ops dma_iommu_ops;
#endif /* __KERNEL__ */
#endif /* _ASM_IOMMU_H */
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