arch/tile: allow building Linux with transparent huge pages enabled
The change adds some infrastructure for managing tile pmd's more generally, using pte_pmd() and pmd_pte() methods to translate pmd values to and from ptes, since on TILEPro a pmd is really just a nested structure holding a pgd (aka pte). Several existing pmd methods are moved into this framework, and a whole raft of additional pmd accessors are defined that are used by the transparent hugepage framework. The tile PTE now has a "client2" bit. The bit is used to indicate a transparent huge page is in the process of being split into subpages. This change also fixes a generic bug where the return value of the generic pmdp_splitting_flush() was incorrect. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>hifive-unleashed-5.1
Chris Metcalf
parent
51007004f4
commit
73636b1aac
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@ -187,6 +187,7 @@ static inline void __pte_clear(pte_t *ptep)
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* Undefined behaviour if not..
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*/
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#define pte_present hv_pte_get_present
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#define pte_mknotpresent hv_pte_clear_present
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#define pte_user hv_pte_get_user
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#define pte_read hv_pte_get_readable
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#define pte_dirty hv_pte_get_dirty
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@ -312,7 +313,7 @@ extern void check_mm_caching(struct mm_struct *prev, struct mm_struct *next);
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*/
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{
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return pfn_pte(hv_pte_get_pfn(pte), newprot);
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return pfn_pte(pte_pfn(pte), newprot);
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}
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/*
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@ -410,6 +411,46 @@ static inline unsigned long pmd_index(unsigned long address)
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return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
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}
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#define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
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static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
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unsigned long address,
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pmd_t *pmdp)
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{
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return ptep_test_and_clear_young(vma, address, pmdp_ptep(pmdp));
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}
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#define __HAVE_ARCH_PMDP_SET_WRPROTECT
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static inline void pmdp_set_wrprotect(struct mm_struct *mm,
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unsigned long address, pmd_t *pmdp)
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{
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ptep_set_wrprotect(mm, address, pmdp_ptep(pmdp));
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}
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#define __HAVE_ARCH_PMDP_GET_AND_CLEAR
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static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm,
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unsigned long address,
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pmd_t *pmdp)
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{
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return pte_pmd(ptep_get_and_clear(mm, address, pmdp_ptep(pmdp)));
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}
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static inline void __set_pmd(pmd_t *pmdp, pmd_t pmdval)
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{
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set_pte(pmdp_ptep(pmdp), pmd_pte(pmdval));
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}
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#define set_pmd_at(mm, addr, pmdp, pmdval) __set_pmd(pmdp, pmdval)
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/* Create a pmd from a PTFN. */
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static inline pmd_t ptfn_pmd(unsigned long ptfn, pgprot_t prot)
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{
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return pte_pmd(hv_pte_set_ptfn(prot, ptfn));
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}
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/* Return the page-table frame number (ptfn) that a pmd_t points at. */
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#define pmd_ptfn(pmd) hv_pte_get_ptfn(pmd_pte(pmd))
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/*
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* A given kernel pmd_t maps to a specific virtual address (either a
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* kernel huge page or a kernel pte_t table). Since kernel pte_t
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@ -432,6 +473,47 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
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*/
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#define pmd_page(pmd) pfn_to_page(HV_PTFN_TO_PFN(pmd_ptfn(pmd)))
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static inline void pmd_clear(pmd_t *pmdp)
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{
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__pte_clear(pmdp_ptep(pmdp));
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}
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#define pmd_mknotpresent(pmd) pte_pmd(pte_mknotpresent(pmd_pte(pmd)))
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#define pmd_young(pmd) pte_young(pmd_pte(pmd))
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#define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd)))
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#define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd)))
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#define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd)))
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#define pmd_write(pmd) pte_write(pmd_pte(pmd))
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#define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd)))
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#define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd)))
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#define pmd_huge_page(pmd) pte_huge(pmd_pte(pmd))
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#define pmd_mkhuge(pmd) pte_pmd(pte_mkhuge(pmd_pte(pmd)))
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#define __HAVE_ARCH_PMD_WRITE
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#define pfn_pmd(pfn, pgprot) pte_pmd(pfn_pte((pfn), (pgprot)))
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#define pmd_pfn(pmd) pte_pfn(pmd_pte(pmd))
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#define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
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static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
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{
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return pfn_pmd(pmd_pfn(pmd), newprot);
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}
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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#define has_transparent_hugepage() 1
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#define pmd_trans_huge pmd_huge_page
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static inline pmd_t pmd_mksplitting(pmd_t pmd)
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{
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return pte_pmd(hv_pte_set_client2(pmd_pte(pmd)));
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}
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static inline int pmd_trans_splitting(pmd_t pmd)
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{
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return hv_pte_get_client2(pmd_pte(pmd));
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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/*
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* The pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
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*
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@ -448,11 +530,6 @@ static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
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return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
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}
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static inline int pmd_huge_page(pmd_t pmd)
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{
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return pmd_val(pmd) & _PAGE_HUGE_PAGE;
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}
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#include <asm-generic/pgtable.h>
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/* Support /proc/NN/pgtable API. */
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@ -111,24 +111,14 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
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return pte;
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}
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static inline void __set_pmd(pmd_t *pmdp, pmd_t pmdval)
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{
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set_pte(&pmdp->pud.pgd, pmdval.pud.pgd);
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}
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/* Create a pmd from a PTFN. */
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static inline pmd_t ptfn_pmd(unsigned long ptfn, pgprot_t prot)
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{
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return (pmd_t){ { hv_pte_set_ptfn(prot, ptfn) } };
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}
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/* Return the page-table frame number (ptfn) that a pmd_t points at. */
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#define pmd_ptfn(pmd) hv_pte_get_ptfn((pmd).pud.pgd)
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static inline void pmd_clear(pmd_t *pmdp)
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{
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__pte_clear(&pmdp->pud.pgd);
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}
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/*
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* pmds are wrappers around pgds, which are the same as ptes.
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* It's often convenient to "cast" back and forth and use the pte methods,
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* which are the methods supplied by the hypervisor.
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*/
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#define pmd_pte(pmd) ((pmd).pud.pgd)
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#define pmdp_ptep(pmdp) (&(pmdp)->pud.pgd)
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#define pte_pmd(pte) ((pmd_t){ { (pte) } })
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#endif /* __ASSEMBLY__ */
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@ -108,28 +108,6 @@ static inline unsigned long pud_index(unsigned long address)
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#define pmd_offset(pud, address) \
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((pmd_t *)pud_page_vaddr(*(pud)) + pmd_index(address))
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static inline void __set_pmd(pmd_t *pmdp, pmd_t pmdval)
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{
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set_pte(pmdp, pmdval);
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}
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/* Create a pmd from a PTFN and pgprot. */
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static inline pmd_t ptfn_pmd(unsigned long ptfn, pgprot_t prot)
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{
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return hv_pte_set_ptfn(prot, ptfn);
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}
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/* Return the page-table frame number (ptfn) that a pmd_t points at. */
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static inline unsigned long pmd_ptfn(pmd_t pmd)
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{
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return hv_pte_get_ptfn(pmd);
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}
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static inline void pmd_clear(pmd_t *pmdp)
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{
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__pte_clear(pmdp);
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}
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/* Normalize an address to having the correct high bits set. */
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#define pgd_addr_normalize pgd_addr_normalize
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static inline unsigned long pgd_addr_normalize(unsigned long addr)
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@ -170,6 +148,13 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
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return hv_pte(__insn_exch(&ptep->val, 0UL));
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}
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/*
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* pmds are the same as pgds and ptes, so converting is a no-op.
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*/
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#define pmd_pte(pmd) (pmd)
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#define pmdp_ptep(pmdp) (pmdp)
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#define pte_pmd(pte) (pte)
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_TILE_PGTABLE_64_H */
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@ -1855,8 +1855,7 @@ int hv_flush_remote(HV_PhysAddr cache_pa, unsigned long cache_control,
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future use. */
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#define HV_PTE_INDEX_MODE 16 /**< Page mode; see HV_PTE_MODE_xxx */
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#define HV_PTE_MODE_BITS 3 /**< Number of bits in mode */
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/* Bit 19 is reserved for
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future use. */
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#define HV_PTE_INDEX_CLIENT2 19 /**< Page client state 2 */
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#define HV_PTE_INDEX_LOTAR 20 /**< Page's LOTAR; must be high bits
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of word */
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#define HV_PTE_LOTAR_BITS 12 /**< Number of bits in a LOTAR */
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@ -2046,6 +2045,13 @@ int hv_flush_remote(HV_PhysAddr cache_pa, unsigned long cache_control,
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*/
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#define HV_PTE_CLIENT1 (__HV_PTE_ONE << HV_PTE_INDEX_CLIENT1)
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/** Client-private bit in PTE.
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*
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* This bit is guaranteed not to be inspected or modified by the
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* hypervisor.
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*/
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#define HV_PTE_CLIENT2 (__HV_PTE_ONE << HV_PTE_INDEX_CLIENT2)
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/** Non-coherent (NC) bit in PTE.
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*
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* If this bit is set, the mapping that is set up will be non-coherent
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@ -2180,6 +2186,7 @@ _HV_BIT(present, PRESENT)
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_HV_BIT(page, PAGE)
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_HV_BIT(client0, CLIENT0)
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_HV_BIT(client1, CLIENT1)
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_HV_BIT(client2, CLIENT2)
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_HV_BIT(migrating, MIGRATING)
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_HV_BIT(nc, NC)
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_HV_BIT(readable, READABLE)
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@ -158,9 +158,8 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
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#endif
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#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
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extern pmd_t pmdp_splitting_flush(struct vm_area_struct *vma,
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unsigned long address,
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pmd_t *pmdp);
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extern void pmdp_splitting_flush(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp);
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#endif
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#ifndef __HAVE_ARCH_PTE_SAME
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@ -109,8 +109,8 @@ pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
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#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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pmd_t pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
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pmd_t *pmdp)
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void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
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pmd_t *pmdp)
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{
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pmd_t pmd = pmd_mksplitting(*pmdp);
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VM_BUG_ON(address & ~HPAGE_PMD_MASK);
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