3f70356edf
Reuse the generic swiotlb initialization for xen-swiotlb. For ARM/ARM64 this works trivially, while for x86 xen_swiotlb_fixup needs to be passed as the remap argument to swiotlb_init_remap/swiotlb_init_late. Note that the lower bound of the swiotlb size is changed to the smaller IO_TLB_MIN_SLABS based value with this patch, but that is fine as the 2MB value used in Xen before was just an optimization and is not the hard lower bound. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#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 <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 <linux/pgtable.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) \
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({ \
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WARN_ON_ONCE(!virt_addr_valid(v)); \
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pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT); \
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})
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#define gfn_to_virt(m) (__va(gfn_to_pfn(m) << XEN_PAGE_SHIFT))
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#define percpu_to_gfn(v) \
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(pfn_to_gfn(per_cpu_ptr_to_phys(v) >> 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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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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phys_addr_t phys,
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dma_addr_t dev_addr);
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#endif /* _ASM_ARM_XEN_PAGE_H */
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