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powerpc/mm: cleanup ifdef mess in add_huge_page_size()

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Introduce a subarch specific helper check_and_get_huge_psize()
to check the huge page sizes and cleanup the ifdef mess in
add_huge_page_size()

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 05:59:46 +00:00 committed by Michael Ellerman
parent 5fb84fec46
commit 723f268f19
4 changed files with 44 additions and 35 deletions
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27
arch/powerpc/include/asm/book3s/64/hugetlb.h
View File

@ -107,4 +107,31 @@ static inline void hugepd_populate(hugepd_t *hpdp, pte_t *new, unsigned int pshi
void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
static inline int check_and_get_huge_psize(int shift)
{
int mmu_psize;
if (shift > SLICE_HIGH_SHIFT)
return -EINVAL;
mmu_psize = shift_to_mmu_psize(shift);
/*
* We need to make sure that for different page sizes reported by
* firmware we only add hugetlb support for page sizes that can be
* supported by linux page table layout.
* For now we have
* Radix: 2M and 1G
* Hash: 16M and 16G
*/
if (radix_enabled()) {
if (mmu_psize != MMU_PAGE_2M && mmu_psize != MMU_PAGE_1G)
return -EINVAL;
} else {
if (mmu_psize != MMU_PAGE_16M && mmu_psize != MMU_PAGE_16G)
return -EINVAL;
}
return mmu_psize;
}
#endif

5
arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h
View File

@ -36,4 +36,9 @@ static inline void hugepd_populate(hugepd_t *hpdp, pte_t *new, unsigned int pshi
(pshift == PAGE_SHIFT_8M ? _PMD_PAGE_8M : _PMD_PAGE_512K));
}
static inline int check_and_get_huge_psize(int shift)
{
return shift_to_mmu_psize(shift);
}
#endif /* _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H */

8
arch/powerpc/include/asm/nohash/hugetlb-book3e.h
View File

@ -34,4 +34,12 @@ static inline void hugepd_populate(hugepd_t *hpdp, pte_t *new, unsigned int pshi
*hpdp = __hugepd(((unsigned long)new & ~PD_HUGE) | pshift);
}
static inline int check_and_get_huge_psize(int shift)
{
if (shift & 1) /* Not a power of 4 */
return -EINVAL;
return shift_to_mmu_psize(shift);
}
#endif /* _ASM_POWERPC_NOHASH_HUGETLB_BOOK3E_H */

39
arch/powerpc/mm/hugetlbpage.c
View File

@ -549,13 +549,6 @@ unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
return vma_kernel_pagesize(vma);
}
static inline bool is_power_of_4(unsigned long x)
{
if (is_power_of_2(x))
return (__ilog2(x) % 2) ? false : true;
return false;
}
static int __init add_huge_page_size(unsigned long long size)
{
int shift = __ffs(size);
@ -563,36 +556,12 @@ static int __init add_huge_page_size(unsigned long long size)
/* Check that it is a page size supported by the hardware and
* that it fits within pagetable and slice limits. */
if (size <= PAGE_SIZE)
return -EINVAL;
#if defined(CONFIG_PPC_FSL_BOOK3E)
if (!is_power_of_4(size))
return -EINVAL;
#elif !defined(CONFIG_PPC_8xx)
if (!is_power_of_2(size) || (shift > SLICE_HIGH_SHIFT))
return -EINVAL;
#endif
if ((mmu_psize = shift_to_mmu_psize(shift)) < 0)
if (size <= PAGE_SIZE || !is_power_of_2(size))
return -EINVAL;
#ifdef CONFIG_PPC_BOOK3S_64
/*
* We need to make sure that for different page sizes reported by
* firmware we only add hugetlb support for page sizes that can be
* supported by linux page table layout.
* For now we have
* Radix: 2M and 1G
* Hash: 16M and 16G
*/
if (radix_enabled()) {
if (mmu_psize != MMU_PAGE_2M && mmu_psize != MMU_PAGE_1G)
return -EINVAL;
} else {
if (mmu_psize != MMU_PAGE_16M && mmu_psize != MMU_PAGE_16G)
return -EINVAL;
}
#endif
mmu_psize = check_and_get_huge_psize(size);
if (mmu_psize < 0)
return -EINVAL;
BUG_ON(mmu_psize_defs[mmu_psize].shift != shift);