blob: ac1b654705631d7a38b1941f308b307cc47767b6 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
#include <asm/page.h>
#include <linux/pfn.h>
#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/pgtable.h>
#include <xen/xen.h>
#include <xen/interface/grant_table.h>
#define phys_to_machine_mapping_valid(pfn) (1)
/* Xen machine address */
typedef struct xmaddr {
phys_addr_t maddr;
} xmaddr_t;
/* Xen pseudo-physical address */
typedef struct xpaddr {
phys_addr_t paddr;
} xpaddr_t;
#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
#define INVALID_P2M_ENTRY (~0UL)
* The pseudo-physical frame (pfn) used in all the helpers is always based
* on Xen page granularity (i.e 4KB).
* A Linux page may be split across multiple non-contiguous Xen page so we
* have to keep track with frame based on 4KB page granularity.
* PV drivers should never make a direct usage of those helpers (particularly
* pfn_to_gfn and gfn_to_pfn).
unsigned long __pfn_to_mfn(unsigned long pfn);
extern struct rb_root phys_to_mach;
/* Pseudo-physical <-> Guest conversion */
static inline unsigned long pfn_to_gfn(unsigned long pfn)
return pfn;
static inline unsigned long gfn_to_pfn(unsigned long gfn)
return gfn;
/* Pseudo-physical <-> BUS conversion */
static inline unsigned long pfn_to_bfn(unsigned long pfn)
unsigned long mfn;
if (phys_to_mach.rb_node != NULL) {
mfn = __pfn_to_mfn(pfn);
if (mfn != INVALID_P2M_ENTRY)
return mfn;
return pfn;
static inline unsigned long bfn_to_pfn(unsigned long bfn)
return bfn;
#define bfn_to_local_pfn(bfn) bfn_to_pfn(bfn)
/* VIRT <-> GUEST conversion */
#define virt_to_gfn(v) \
({ \
WARN_ON_ONCE(!virt_addr_valid(v)); \
pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT); \
#define gfn_to_virt(m) (__va(gfn_to_pfn(m) << XEN_PAGE_SHIFT))
#define percpu_to_gfn(v) \
(pfn_to_gfn(per_cpu_ptr_to_phys(v) >> XEN_PAGE_SHIFT))
/* Only used in PV code. But ARM guests are always HVM. */
static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
struct gnttab_map_grant_ref *kmap_ops,
struct page **pages, unsigned int count);
extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
struct gnttab_unmap_grant_ref *kunmap_ops,
struct page **pages, unsigned int count);
bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
unsigned long nr_pages);
static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
return __set_phys_to_machine(pfn, mfn);
#define xen_remap(cookie, size) ioremap_cache((cookie), (size))
#define xen_unmap(cookie) iounmap((cookie))
bool xen_arch_need_swiotlb(struct device *dev,
phys_addr_t phys,
dma_addr_t dev_addr);
unsigned long xen_get_swiotlb_free_pages(unsigned int order);
#endif /* _ASM_ARM_XEN_PAGE_H */