Commit 73636b1a authored by Chris Metcalf's avatar Chris Metcalf

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