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https://github.com/torvalds/linux
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b2fa47e6bf
Rework the architecture page table functions to access the bits in the page table extension array (pgste). There are a number of changes: 1) Fix missing pgste update if the attach_count for the mm is <= 1. 2) For every operation that affects the invalid bit in the pte or the rcp byte in the pgste the pcl lock needs to be acquired. The function pgste_get_lock gets the pcl lock and returns the current pgste value for a pte pointer. The function pgste_set_unlock stores the pgste and releases the lock. Between these two calls the bits in the pgste can be shuffled. 3) Define two software bits in the pte _PAGE_SWR and _PAGE_SWC to avoid calling SetPageDirty and SetPageReferenced from pgtable.h. If the host reference backup bit or the host change backup bit has been set the dirty/referenced state is transfered to the pte. The common code will pick up the state from the pte. 4) Add ptep_modify_prot_start and ptep_modify_prot_commit for mprotect. 5) Remove pgd_populate_kernel, pud_populate_kernel, pmd_populate_kernel pgd_clear_kernel, pud_clear_kernel, pmd_clear_kernel and ptep_invalidate. 6) Rename kvm_s390_test_and_clear_page_dirty to ptep_test_and_clear_user_dirty and add ptep_test_and_clear_user_young. 7) Define mm_exclusive() and mm_has_pgste() helper to improve readability. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
208 lines
5.6 KiB
C
208 lines
5.6 KiB
C
/*
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* include/asm-s390/page.h
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*
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* S390 version
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* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Hartmut Penner (hp@de.ibm.com)
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*/
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#ifndef _S390_PAGE_H
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#define _S390_PAGE_H
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#include <linux/const.h>
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#include <asm/types.h>
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/* PAGE_SHIFT determines the page size */
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#define PAGE_SHIFT 12
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#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#define PAGE_DEFAULT_ACC 0
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#define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)
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#define HPAGE_SHIFT 20
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#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE - 1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
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#define ARCH_HAS_SETCLEAR_HUGE_PTE
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#define ARCH_HAS_HUGE_PTE_TYPE
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#define ARCH_HAS_PREPARE_HUGEPAGE
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#define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
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#include <asm/setup.h>
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#ifndef __ASSEMBLY__
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static inline void clear_page(void *page)
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{
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if (MACHINE_HAS_PFMF) {
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asm volatile(
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" .insn rre,0xb9af0000,%0,%1"
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: : "d" (0x10000), "a" (page) : "memory", "cc");
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} else {
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register unsigned long reg1 asm ("1") = 0;
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register void *reg2 asm ("2") = page;
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register unsigned long reg3 asm ("3") = 4096;
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asm volatile(
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" mvcl 2,0"
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: "+d" (reg2), "+d" (reg3) : "d" (reg1)
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: "memory", "cc");
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}
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}
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static inline void copy_page(void *to, void *from)
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{
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if (MACHINE_HAS_MVPG) {
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register unsigned long reg0 asm ("0") = 0;
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asm volatile(
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" mvpg %0,%1"
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: : "a" (to), "a" (from), "d" (reg0)
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: "memory", "cc");
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} else
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asm volatile(
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" mvc 0(256,%0),0(%1)\n"
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" mvc 256(256,%0),256(%1)\n"
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" mvc 512(256,%0),512(%1)\n"
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" mvc 768(256,%0),768(%1)\n"
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" mvc 1024(256,%0),1024(%1)\n"
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" mvc 1280(256,%0),1280(%1)\n"
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" mvc 1536(256,%0),1536(%1)\n"
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" mvc 1792(256,%0),1792(%1)\n"
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" mvc 2048(256,%0),2048(%1)\n"
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" mvc 2304(256,%0),2304(%1)\n"
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" mvc 2560(256,%0),2560(%1)\n"
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" mvc 2816(256,%0),2816(%1)\n"
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" mvc 3072(256,%0),3072(%1)\n"
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" mvc 3328(256,%0),3328(%1)\n"
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" mvc 3584(256,%0),3584(%1)\n"
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" mvc 3840(256,%0),3840(%1)\n"
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: : "a" (to), "a" (from) : "memory");
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}
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
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alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
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#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
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/*
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* These are used to make use of C type-checking..
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*/
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typedef struct { unsigned long pgprot; } pgprot_t;
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typedef struct { unsigned long pgste; } pgste_t;
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typedef struct { unsigned long pte; } pte_t;
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typedef struct { unsigned long pmd; } pmd_t;
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typedef struct { unsigned long pud; } pud_t;
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typedef struct { unsigned long pgd; } pgd_t;
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typedef pte_t *pgtable_t;
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#define pgprot_val(x) ((x).pgprot)
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#define pgste_val(x) ((x).pgste)
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#define pte_val(x) ((x).pte)
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#define pmd_val(x) ((x).pmd)
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#define pud_val(x) ((x).pud)
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#define pgd_val(x) ((x).pgd)
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#define __pgste(x) ((pgste_t) { (x) } )
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#define __pte(x) ((pte_t) { (x) } )
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#define __pmd(x) ((pmd_t) { (x) } )
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#define __pud(x) ((pud_t) { (x) } )
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#define __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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static inline void page_set_storage_key(unsigned long addr,
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unsigned char skey, int mapped)
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{
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if (!mapped)
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asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
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: : "d" (skey), "a" (addr));
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else
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asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
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}
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static inline unsigned char page_get_storage_key(unsigned long addr)
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{
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unsigned char skey;
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asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
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return skey;
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}
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static inline int page_reset_referenced(unsigned long addr)
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{
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unsigned int ipm;
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asm volatile(
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" rrbe 0,%1\n"
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" ipm %0\n"
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: "=d" (ipm) : "a" (addr) : "cc");
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return !!(ipm & 0x20000000);
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}
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/* Bits int the storage key */
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#define _PAGE_CHANGED 0x02 /* HW changed bit */
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#define _PAGE_REFERENCED 0x04 /* HW referenced bit */
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#define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */
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#define _PAGE_ACC_BITS 0xf0 /* HW access control bits */
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/*
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* Test and clear dirty bit in storage key.
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* We can't clear the changed bit atomically. This is a potential
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* race against modification of the referenced bit. This function
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* should therefore only be called if it is not mapped in any
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* address space.
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*/
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#define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
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static inline int page_test_and_clear_dirty(unsigned long pfn, int mapped)
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{
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unsigned char skey;
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skey = page_get_storage_key(pfn << PAGE_SHIFT);
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if (!(skey & _PAGE_CHANGED))
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return 0;
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page_set_storage_key(pfn << PAGE_SHIFT, skey & ~_PAGE_CHANGED, mapped);
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return 1;
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}
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/*
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* Test and clear referenced bit in storage key.
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*/
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#define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
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static inline int page_test_and_clear_young(unsigned long pfn)
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{
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return page_reset_referenced(pfn << PAGE_SHIFT);
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}
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struct page;
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void arch_free_page(struct page *page, int order);
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void arch_alloc_page(struct page *page, int order);
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static inline int devmem_is_allowed(unsigned long pfn)
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{
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return 0;
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}
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#define HAVE_ARCH_FREE_PAGE
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#define HAVE_ARCH_ALLOC_PAGE
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#endif /* !__ASSEMBLY__ */
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#define __PAGE_OFFSET 0x0UL
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#define PAGE_OFFSET 0x0UL
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#define __pa(x) (unsigned long)(x)
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#define __va(x) (void *)(unsigned long)(x)
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#include <asm-generic/memory_model.h>
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#include <asm-generic/getorder.h>
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#define __HAVE_ARCH_GATE_AREA 1
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#endif /* _S390_PAGE_H */
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