mirror of https://gitee.com/openkylin/linux.git
xen: Make functions static
Some functions in arch/x86/xen/p2m.c are used locally only. Make them static. Rearrange the functions in p2m.c to avoid forward declarations. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Juergen Gross
David Vrabel
parent
6f58d89e6c
commit
820c4db2be
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@ -52,15 +52,9 @@ extern unsigned long set_phys_range_identity(unsigned long pfn_s,
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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 m2p_add_override(unsigned long mfn, struct page *page,
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struct gnttab_map_grant_ref *kmap_op);
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extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_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 m2p_remove_override(struct page *page,
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struct gnttab_map_grant_ref *kmap_op,
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unsigned long mfn);
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extern struct page *m2p_find_override(unsigned long mfn);
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extern unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn);
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static inline unsigned long pfn_to_mfn(unsigned long pfn)
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@ -896,6 +896,61 @@ static unsigned long mfn_hash(unsigned long mfn)
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return hash_long(mfn, M2P_OVERRIDE_HASH_SHIFT);
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}
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/* Add an MFN override for a particular page */
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static int m2p_add_override(unsigned long mfn, struct page *page,
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struct gnttab_map_grant_ref *kmap_op)
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{
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unsigned long flags;
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unsigned long pfn;
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unsigned long uninitialized_var(address);
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unsigned level;
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pte_t *ptep = NULL;
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pfn = page_to_pfn(page);
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if (!PageHighMem(page)) {
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address = (unsigned long)__va(pfn << PAGE_SHIFT);
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ptep = lookup_address(address, &level);
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if (WARN(ptep == NULL || level != PG_LEVEL_4K,
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"m2p_add_override: pfn %lx not mapped", pfn))
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return -EINVAL;
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}
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if (kmap_op != NULL) {
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if (!PageHighMem(page)) {
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struct multicall_space mcs =
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xen_mc_entry(sizeof(*kmap_op));
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MULTI_grant_table_op(mcs.mc,
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GNTTABOP_map_grant_ref, kmap_op, 1);
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xen_mc_issue(PARAVIRT_LAZY_MMU);
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}
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}
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spin_lock_irqsave(&m2p_override_lock, flags);
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list_add(&page->lru, &m2p_overrides[mfn_hash(mfn)]);
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spin_unlock_irqrestore(&m2p_override_lock, flags);
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/* p2m(m2p(mfn)) == mfn: the mfn is already present somewhere in
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* this domain. Set the FOREIGN_FRAME_BIT in the p2m for the other
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* pfn so that the following mfn_to_pfn(mfn) calls will return the
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* pfn from the m2p_override (the backend pfn) instead.
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* We need to do this because the pages shared by the frontend
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* (xen-blkfront) can be already locked (lock_page, called by
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* do_read_cache_page); when the userspace backend tries to use them
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* with direct_IO, mfn_to_pfn returns the pfn of the frontend, so
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* do_blockdev_direct_IO is going to try to lock the same pages
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* again resulting in a deadlock.
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* As a side effect get_user_pages_fast might not be safe on the
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* frontend pages while they are being shared with the backend,
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* because mfn_to_pfn (that ends up being called by GUPF) will
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* return the backend pfn rather than the frontend pfn. */
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pfn = mfn_to_pfn_no_overrides(mfn);
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if (get_phys_to_machine(pfn) == mfn)
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set_phys_to_machine(pfn, FOREIGN_FRAME(mfn));
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return 0;
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}
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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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@ -955,109 +1010,31 @@ int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
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}
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EXPORT_SYMBOL_GPL(set_foreign_p2m_mapping);
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/* Add an MFN override for a particular page */
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int m2p_add_override(unsigned long mfn, struct page *page,
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struct gnttab_map_grant_ref *kmap_op)
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static struct page *m2p_find_override(unsigned long mfn)
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{
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unsigned long flags;
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unsigned long pfn;
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unsigned long uninitialized_var(address);
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unsigned level;
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pte_t *ptep = NULL;
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struct list_head *bucket = &m2p_overrides[mfn_hash(mfn)];
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struct page *p, *ret;
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pfn = page_to_pfn(page);
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if (!PageHighMem(page)) {
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address = (unsigned long)__va(pfn << PAGE_SHIFT);
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ptep = lookup_address(address, &level);
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if (WARN(ptep == NULL || level != PG_LEVEL_4K,
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"m2p_add_override: pfn %lx not mapped", pfn))
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return -EINVAL;
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}
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ret = NULL;
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if (kmap_op != NULL) {
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if (!PageHighMem(page)) {
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struct multicall_space mcs =
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xen_mc_entry(sizeof(*kmap_op));
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spin_lock_irqsave(&m2p_override_lock, flags);
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MULTI_grant_table_op(mcs.mc,
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GNTTABOP_map_grant_ref, kmap_op, 1);
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xen_mc_issue(PARAVIRT_LAZY_MMU);
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list_for_each_entry(p, bucket, lru) {
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if (page_private(p) == mfn) {
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ret = p;
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break;
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}
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}
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spin_lock_irqsave(&m2p_override_lock, flags);
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list_add(&page->lru, &m2p_overrides[mfn_hash(mfn)]);
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spin_unlock_irqrestore(&m2p_override_lock, flags);
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/* p2m(m2p(mfn)) == mfn: the mfn is already present somewhere in
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* this domain. Set the FOREIGN_FRAME_BIT in the p2m for the other
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* pfn so that the following mfn_to_pfn(mfn) calls will return the
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* pfn from the m2p_override (the backend pfn) instead.
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* We need to do this because the pages shared by the frontend
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* (xen-blkfront) can be already locked (lock_page, called by
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* do_read_cache_page); when the userspace backend tries to use them
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* with direct_IO, mfn_to_pfn returns the pfn of the frontend, so
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* do_blockdev_direct_IO is going to try to lock the same pages
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* again resulting in a deadlock.
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* As a side effect get_user_pages_fast might not be safe on the
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* frontend pages while they are being shared with the backend,
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* because mfn_to_pfn (that ends up being called by GUPF) will
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* return the backend pfn rather than the frontend pfn. */
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pfn = mfn_to_pfn_no_overrides(mfn);
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if (get_phys_to_machine(pfn) == mfn)
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set_phys_to_machine(pfn, FOREIGN_FRAME(mfn));
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return 0;
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}
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EXPORT_SYMBOL_GPL(m2p_add_override);
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int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_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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{
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int i, ret = 0;
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bool lazy = false;
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return 0;
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if (kmap_ops &&
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!in_interrupt() &&
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paravirt_get_lazy_mode() == PARAVIRT_LAZY_NONE) {
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arch_enter_lazy_mmu_mode();
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lazy = true;
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}
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for (i = 0; i < count; i++) {
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unsigned long mfn = get_phys_to_machine(page_to_pfn(pages[i]));
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unsigned long pfn = page_to_pfn(pages[i]);
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if (mfn == INVALID_P2M_ENTRY || !(mfn & FOREIGN_FRAME_BIT)) {
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ret = -EINVAL;
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goto out;
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}
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set_page_private(pages[i], INVALID_P2M_ENTRY);
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WARN_ON(!PagePrivate(pages[i]));
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ClearPagePrivate(pages[i]);
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set_phys_to_machine(pfn, pages[i]->index);
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if (kmap_ops)
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ret = m2p_remove_override(pages[i], &kmap_ops[i], mfn);
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if (ret)
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goto out;
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}
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out:
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if (lazy)
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arch_leave_lazy_mmu_mode();
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return ret;
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}
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EXPORT_SYMBOL_GPL(clear_foreign_p2m_mapping);
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int m2p_remove_override(struct page *page,
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struct gnttab_map_grant_ref *kmap_op,
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unsigned long mfn)
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static int m2p_remove_override(struct page *page,
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struct gnttab_map_grant_ref *kmap_op,
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unsigned long mfn)
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{
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unsigned long flags;
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unsigned long pfn;
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@ -1150,29 +1127,50 @@ int m2p_remove_override(struct page *page,
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return 0;
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}
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EXPORT_SYMBOL_GPL(m2p_remove_override);
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struct page *m2p_find_override(unsigned long mfn)
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int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_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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{
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unsigned long flags;
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struct list_head *bucket = &m2p_overrides[mfn_hash(mfn)];
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struct page *p, *ret;
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int i, ret = 0;
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bool lazy = false;
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ret = NULL;
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return 0;
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spin_lock_irqsave(&m2p_override_lock, flags);
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list_for_each_entry(p, bucket, lru) {
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if (page_private(p) == mfn) {
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ret = p;
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break;
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}
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if (kmap_ops &&
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!in_interrupt() &&
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paravirt_get_lazy_mode() == PARAVIRT_LAZY_NONE) {
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arch_enter_lazy_mmu_mode();
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lazy = true;
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}
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spin_unlock_irqrestore(&m2p_override_lock, flags);
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for (i = 0; i < count; i++) {
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unsigned long mfn = get_phys_to_machine(page_to_pfn(pages[i]));
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unsigned long pfn = page_to_pfn(pages[i]);
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if (mfn == INVALID_P2M_ENTRY || !(mfn & FOREIGN_FRAME_BIT)) {
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ret = -EINVAL;
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goto out;
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}
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set_page_private(pages[i], INVALID_P2M_ENTRY);
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WARN_ON(!PagePrivate(pages[i]));
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ClearPagePrivate(pages[i]);
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set_phys_to_machine(pfn, pages[i]->index);
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if (kmap_ops)
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ret = m2p_remove_override(pages[i], &kmap_ops[i], mfn);
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if (ret)
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goto out;
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}
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out:
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if (lazy)
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arch_leave_lazy_mmu_mode();
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return ret;
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}
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EXPORT_SYMBOL_GPL(clear_foreign_p2m_mapping);
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unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn)
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{
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