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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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aeed5fce37
Fix warning from pmd_bad() at bootup on a HIGHMEM64G HIGHPTE x86_32. That came from9fc34113f6x86: debug pmd_bad(); but we understand now that the typecasting was wrong for PAE in the previous version: pagetable pages above 4GB looked bad and stopped Arjan from booting. And revert thatcded932b75x86: fix pmd_bad and pud_bad to support huge pages. It was the wrong way round: we shouldn't weaken every pmd_bad and pud_bad check to let huge pages slip through - in part they check that we _don't_ have a huge page where it's not expected. Put the x86 pmd_bad() and pud_bad() definitions back to what they have long been: they can be improved (x86_32 should use PTE_MASK, to stop PAE thinking junk in the upper word is good; and x86_64 should follow x86_32's stricter comparison, to stop thinking any subset of required bits is good); but that should be a later patch. Fix Hans' good observation that follow_page() will never find pmd_huge() because that would have already failed the pmd_bad test: test pmd_huge in between the pmd_none and pmd_bad tests. Tighten x86's pmd_huge() check? No, once it's a hugepage entry, it can get quite far from a good pmd: for example, PROT_NONE leaves it with only ACCESSED of the KERN_PGTABLE bits. However... though follow_page() contains this and another test for huge pages, so it's nice to keep it working on them, where does it actually get called on a huge page? get_user_pages() checks is_vm_hugetlb_page(vma) to to call alternative hugetlb processing, as does unmap_vmas() and others. Signed-off-by: Hugh Dickins <hugh@veritas.com> Earlier-version-tested-by: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jeff Chua <jeff.chua.linux@gmail.com> Cc: Hans Rosenfeld <hans.rosenfeld@amd.com> Cc: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
286 lines
7.9 KiB
C
286 lines
7.9 KiB
C
#ifndef _X86_64_PGTABLE_H
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#define _X86_64_PGTABLE_H
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#include <linux/const.h>
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#ifndef __ASSEMBLY__
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/*
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* This file contains the functions and defines necessary to modify and use
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* the x86-64 page table tree.
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*/
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#include <asm/processor.h>
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#include <linux/bitops.h>
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#include <linux/threads.h>
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#include <asm/pda.h>
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extern pud_t level3_kernel_pgt[512];
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extern pud_t level3_ident_pgt[512];
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extern pmd_t level2_kernel_pgt[512];
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extern pgd_t init_level4_pgt[];
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#define swapper_pg_dir init_level4_pgt
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extern void paging_init(void);
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#endif /* !__ASSEMBLY__ */
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#define SHARED_KERNEL_PMD 0
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/*
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* PGDIR_SHIFT determines what a top-level page table entry can map
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*/
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#define PGDIR_SHIFT 39
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#define PTRS_PER_PGD 512
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/*
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* 3rd level page
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*/
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#define PUD_SHIFT 30
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#define PTRS_PER_PUD 512
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/*
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* PMD_SHIFT determines the size of the area a middle-level
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* page table can map
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*/
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#define PMD_SHIFT 21
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#define PTRS_PER_PMD 512
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/*
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* entries per page directory level
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*/
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#define PTRS_PER_PTE 512
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#ifndef __ASSEMBLY__
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %p(%016lx).\n", \
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__FILE__, __LINE__, &(e), pte_val(e))
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#define pmd_ERROR(e) \
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printk("%s:%d: bad pmd %p(%016lx).\n", \
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__FILE__, __LINE__, &(e), pmd_val(e))
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#define pud_ERROR(e) \
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printk("%s:%d: bad pud %p(%016lx).\n", \
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__FILE__, __LINE__, &(e), pud_val(e))
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#define pgd_ERROR(e) \
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printk("%s:%d: bad pgd %p(%016lx).\n", \
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__FILE__, __LINE__, &(e), pgd_val(e))
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#define pgd_none(x) (!pgd_val(x))
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#define pud_none(x) (!pud_val(x))
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struct mm_struct;
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static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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*ptep = native_make_pte(0);
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}
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static inline void native_set_pte(pte_t *ptep, pte_t pte)
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{
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*ptep = pte;
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}
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static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
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{
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native_set_pte(ptep, pte);
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}
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static inline pte_t native_ptep_get_and_clear(pte_t *xp)
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{
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#ifdef CONFIG_SMP
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return native_make_pte(xchg(&xp->pte, 0));
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#else
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/* native_local_ptep_get_and_clear,
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but duplicated because of cyclic dependency */
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pte_t ret = *xp;
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native_pte_clear(NULL, 0, xp);
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return ret;
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#endif
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}
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static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
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{
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*pmdp = pmd;
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}
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static inline void native_pmd_clear(pmd_t *pmd)
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{
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native_set_pmd(pmd, native_make_pmd(0));
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}
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static inline void native_set_pud(pud_t *pudp, pud_t pud)
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{
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*pudp = pud;
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}
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static inline void native_pud_clear(pud_t *pud)
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{
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native_set_pud(pud, native_make_pud(0));
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}
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static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
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{
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*pgdp = pgd;
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}
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static inline void native_pgd_clear(pgd_t *pgd)
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{
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native_set_pgd(pgd, native_make_pgd(0));
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}
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#define pte_same(a, b) ((a).pte == (b).pte)
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#endif /* !__ASSEMBLY__ */
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#define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE - 1))
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#define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
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#define PUD_MASK (~(PUD_SIZE - 1))
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#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE - 1))
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#define MAXMEM _AC(0x00003fffffffffff, UL)
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#define VMALLOC_START _AC(0xffffc20000000000, UL)
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#define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
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#define VMEMMAP_START _AC(0xffffe20000000000, UL)
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#define MODULES_VADDR _AC(0xffffffffa0000000, UL)
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#define MODULES_END _AC(0xfffffffffff00000, UL)
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#define MODULES_LEN (MODULES_END - MODULES_VADDR)
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#ifndef __ASSEMBLY__
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static inline unsigned long pgd_bad(pgd_t pgd)
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{
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return pgd_val(pgd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
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}
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static inline unsigned long pud_bad(pud_t pud)
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{
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return pud_val(pud) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
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}
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static inline unsigned long pmd_bad(pmd_t pmd)
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{
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return pmd_val(pmd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
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}
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#define pte_none(x) (!pte_val((x)))
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#define pte_present(x) (pte_val((x)) & (_PAGE_PRESENT | _PAGE_PROTNONE))
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#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT)) /* FIXME: is this right? */
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#define pte_page(x) pfn_to_page(pte_pfn((x)))
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#define pte_pfn(x) ((pte_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT)
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/*
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* Macro to mark a page protection value as "uncacheable".
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*/
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#define pgprot_noncached(prot) \
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(__pgprot(pgprot_val((prot)) | _PAGE_PCD | _PAGE_PWT))
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*/
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/*
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* Level 4 access.
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*/
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#define pgd_page_vaddr(pgd) \
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((unsigned long)__va((unsigned long)pgd_val((pgd)) & PTE_MASK))
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#define pgd_page(pgd) (pfn_to_page(pgd_val((pgd)) >> PAGE_SHIFT))
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#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
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#define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
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#define pgd_offset_k(address) (init_level4_pgt + pgd_index((address)))
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#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
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static inline int pgd_large(pgd_t pgd) { return 0; }
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#define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
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/* PUD - Level3 access */
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/* to find an entry in a page-table-directory. */
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#define pud_page_vaddr(pud) \
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((unsigned long)__va(pud_val((pud)) & PHYSICAL_PAGE_MASK))
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#define pud_page(pud) (pfn_to_page(pud_val((pud)) >> PAGE_SHIFT))
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#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
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#define pud_offset(pgd, address) \
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((pud_t *)pgd_page_vaddr(*(pgd)) + pud_index((address)))
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#define pud_present(pud) (pud_val((pud)) & _PAGE_PRESENT)
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static inline int pud_large(pud_t pte)
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{
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return (pud_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
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(_PAGE_PSE | _PAGE_PRESENT);
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}
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/* PMD - Level 2 access */
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#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val((pmd)) & PTE_MASK))
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#define pmd_page(pmd) (pfn_to_page(pmd_val((pmd)) >> PAGE_SHIFT))
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#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
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#define pmd_offset(dir, address) ((pmd_t *)pud_page_vaddr(*(dir)) + \
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pmd_index(address))
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#define pmd_none(x) (!pmd_val((x)))
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#define pmd_present(x) (pmd_val((x)) & _PAGE_PRESENT)
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#define pfn_pmd(nr, prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val((prot))))
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#define pmd_pfn(x) ((pmd_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT)
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#define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
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#define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | \
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_PAGE_FILE })
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#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
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/* PTE - Level 1 access. */
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/* page, protection -> pte */
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#define mk_pte(page, pgprot) pfn_pte(page_to_pfn((page)), (pgprot))
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#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
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#define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
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pte_index((address)))
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/* x86-64 always has all page tables mapped. */
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#define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
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#define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
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#define pte_unmap(pte) /* NOP */
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#define pte_unmap_nested(pte) /* NOP */
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#define update_mmu_cache(vma, address, pte) do { } while (0)
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extern int direct_gbpages;
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/* Encode and de-code a swap entry */
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#define __swp_type(x) (((x).val >> 1) & 0x3f)
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#define __swp_offset(x) ((x).val >> 8)
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#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | \
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((offset) << 8) })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
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#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
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extern int kern_addr_valid(unsigned long addr);
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extern void cleanup_highmap(void);
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#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
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remap_pfn_range(vma, vaddr, pfn, size, prot)
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#define HAVE_ARCH_UNMAPPED_AREA
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#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
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#define pgtable_cache_init() do { } while (0)
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#define check_pgt_cache() do { } while (0)
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#define PAGE_AGP PAGE_KERNEL_NOCACHE
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#define HAVE_PAGE_AGP 1
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/* fs/proc/kcore.c */
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#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
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#define kc_offset_to_vaddr(o) \
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(((o) & (1UL << (__VIRTUAL_MASK_SHIFT - 1))) \
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? ((o) | ~__VIRTUAL_MASK) \
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: (o))
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#define __HAVE_ARCH_PTE_SAME
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#endif /* !__ASSEMBLY__ */
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#endif /* _X86_64_PGTABLE_H */
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