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powerpc/mm: cleanup HPAGE_SHIFT setup 

Only book3s/64 may select default among several HPAGE_SHIFT at runtime.
8xx always defines 512K pages as default
FSL_BOOK3E always defines 4M pages as default

This patch limits HUGETLB_PAGE_SIZE_VARIABLE to book3s/64
moves the definitions in subarches files.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2019-04-26 05:59:48 +00:00 committed by Michael Ellerman
parent 45d0ba527b
commit c5710cd207
5 changed files with 30 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/Kconfig
View File

@ -390,7 +390,7 @@ source "kernel/Kconfig.hz"
config HUGETLB_PAGE_SIZE_VARIABLE
bool
depends on HUGETLB_PAGE
depends on HUGETLB_PAGE && PPC_BOOK3S_64
default y
config MATH_EMULATION

2
arch/powerpc/include/asm/hugetlb.h
View File

@ -15,6 +15,8 @@
extern bool hugetlb_disabled;
void hugetlbpage_init_default(void);
void flush_dcache_icache_hugepage(struct page *page);
int slice_is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,

11
arch/powerpc/include/asm/page.h
View File

@ -28,10 +28,15 @@
#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
#ifndef __ASSEMBLY__
#ifdef CONFIG_HUGETLB_PAGE
extern unsigned int HPAGE_SHIFT;
#else
#ifndef CONFIG_HUGETLB_PAGE
#define HPAGE_SHIFT PAGE_SHIFT
#elif defined(CONFIG_PPC_BOOK3S_64)
extern unsigned int hpage_shift;
#define HPAGE_SHIFT hpage_shift
#elif defined(CONFIG_PPC_8xx)
#define HPAGE_SHIFT 19 /* 512k pages */
#elif defined(CONFIG_PPC_FSL_BOOK3E)
#define HPAGE_SHIFT 22 /* 4M pages */
#endif
#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
#define HPAGE_MASK (~(HPAGE_SIZE - 1))

16
arch/powerpc/mm/book3s64/hash_hugetlbpage.c
View File

@ -15,6 +15,9 @@
#include <asm/cacheflush.h>
#include <asm/machdep.h>
unsigned int hpage_shift;
EXPORT_SYMBOL(hpage_shift);
extern long hpte_insert_repeating(unsigned long hash, unsigned long vpn,
unsigned long pa, unsigned long rlags,
unsigned long vflags, int psize, int ssize);
@ -150,3 +153,16 @@ void huge_ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr
old_pte, pte);
set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
}
void hugetlbpage_init_default(void)
{
/* Set default large page size. Currently, we pick 16M or 1M
* depending on what is available
*/
if (mmu_psize_defs[MMU_PAGE_16M].shift)
hpage_shift = mmu_psize_defs[MMU_PAGE_16M].shift;
else if (mmu_psize_defs[MMU_PAGE_1M].shift)
hpage_shift = mmu_psize_defs[MMU_PAGE_1M].shift;
else if (mmu_psize_defs[MMU_PAGE_2M].shift)
hpage_shift = mmu_psize_defs[MMU_PAGE_2M].shift;
}

23
arch/powerpc/mm/hugetlbpage.c
View File

@ -28,9 +28,6 @@
bool hugetlb_disabled = false;
unsigned int HPAGE_SHIFT;
EXPORT_SYMBOL(HPAGE_SHIFT);
#define hugepd_none(hpd) (hpd_val(hpd) == 0)
#define PTE_T_ORDER (__builtin_ffs(sizeof(pte_t)) - __builtin_ffs(sizeof(void *)))
@ -645,23 +642,9 @@ static int __init hugetlbpage_init(void)
#endif
}
#if defined(CONFIG_PPC_FSL_BOOK3E) || defined(CONFIG_PPC_8xx)
/* Default hpage size = 4M on FSL_BOOK3E and 512k on 8xx */
if (mmu_psize_defs[MMU_PAGE_4M].shift)
HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_4M].shift;
else if (mmu_psize_defs[MMU_PAGE_512K].shift)
HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_512K].shift;
#else
/* Set default large page size. Currently, we pick 16M or 1M
* depending on what is available
*/
if (mmu_psize_defs[MMU_PAGE_16M].shift)
HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_16M].shift;
else if (mmu_psize_defs[MMU_PAGE_1M].shift)
HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_1M].shift;
else if (mmu_psize_defs[MMU_PAGE_2M].shift)
HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_2M].shift;
#endif
if (IS_ENABLED(HUGETLB_PAGE_SIZE_VARIABLE))
hugetlbpage_init_default();
return 0;
}