250c9af3d8
The hypercall interface is always using 4KB page granularity. This is requiring to use xen page definition macro when we deal with hypercall. Note that pfn_to_gfn is working with a Xen pfn (i.e 4KB). We may want to rename pfn_gfn to make this explicit. We also allocate a 64KB page for the shared page even though only the first 4KB is used. I don't think this is really important for now as it helps to have the pointer 4KB aligned (XENMEM_add_to_physmap is taking a Xen PFN). Signed-off-by: Julien Grall <julien.grall@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
#ifndef _ASM_ARM_XEN_PAGE_H
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#define _ASM_ARM_XEN_PAGE_H
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <linux/pfn.h>
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#include <linux/types.h>
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#include <linux/dma-mapping.h>
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#include <xen/xen.h>
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#include <xen/interface/grant_table.h>
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#define phys_to_machine_mapping_valid(pfn) (1)
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/* Xen machine address */
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typedef struct xmaddr {
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phys_addr_t maddr;
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} xmaddr_t;
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/* Xen pseudo-physical address */
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typedef struct xpaddr {
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phys_addr_t paddr;
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} xpaddr_t;
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#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
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#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
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#define INVALID_P2M_ENTRY (~0UL)
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/*
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* The pseudo-physical frame (pfn) used in all the helpers is always based
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* on Xen page granularity (i.e 4KB).
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*
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* A Linux page may be split across multiple non-contiguous Xen page so we
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* have to keep track with frame based on 4KB page granularity.
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*
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* PV drivers should never make a direct usage of those helpers (particularly
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* pfn_to_gfn and gfn_to_pfn).
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*/
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unsigned long __pfn_to_mfn(unsigned long pfn);
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extern struct rb_root phys_to_mach;
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/* Pseudo-physical <-> Guest conversion */
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static inline unsigned long pfn_to_gfn(unsigned long pfn)
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{
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return pfn;
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}
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static inline unsigned long gfn_to_pfn(unsigned long gfn)
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{
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return gfn;
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}
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/* Pseudo-physical <-> BUS conversion */
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static inline unsigned long pfn_to_bfn(unsigned long pfn)
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{
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unsigned long mfn;
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if (phys_to_mach.rb_node != NULL) {
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mfn = __pfn_to_mfn(pfn);
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if (mfn != INVALID_P2M_ENTRY)
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return mfn;
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}
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return pfn;
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}
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static inline unsigned long bfn_to_pfn(unsigned long bfn)
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{
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return bfn;
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}
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#define bfn_to_local_pfn(bfn) bfn_to_pfn(bfn)
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/* VIRT <-> GUEST conversion */
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#define virt_to_gfn(v) (pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT))
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#define gfn_to_virt(m) (__va(gfn_to_pfn(m) << XEN_PAGE_SHIFT))
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/* Only used in PV code. But ARM guests are always HVM. */
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static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
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{
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BUG();
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}
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/* TODO: this shouldn't be here but it is because the frontend drivers
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* are using it (its rolled in headers) even though we won't hit the code path.
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* So for right now just punt with this.
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*/
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static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
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{
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BUG();
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return NULL;
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}
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extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
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struct gnttab_map_grant_ref *kmap_ops,
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struct page **pages, unsigned int count);
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extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
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struct gnttab_unmap_grant_ref *kunmap_ops,
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struct page **pages, unsigned int count);
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bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
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bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
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unsigned long nr_pages);
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static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
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{
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return __set_phys_to_machine(pfn, mfn);
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}
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#define xen_remap(cookie, size) ioremap_cache((cookie), (size))
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#define xen_unmap(cookie) iounmap((cookie))
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bool xen_arch_need_swiotlb(struct device *dev,
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unsigned long pfn,
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unsigned long bfn);
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unsigned long xen_get_swiotlb_free_pages(unsigned int order);
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#endif /* _ASM_ARM_XEN_PAGE_H */
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