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Date: Thu, 21 Mar 2019 11:42:16 +0100
From: Christophe Leroy <christophe.leroy@....fr>
To: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
aneesh.kumar@...ux.ibm.com, Russell Currey <ruscur@...sell.cc>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 11/27] powerpc/mm: split asm/hugetlb.h into dedicated
subarch files
snowpatch fails applying this.
I usually base my patches on branch merge. Shouldn't snowpatch use merge
branch as well instead of next branch ?
Christophe
Le 20/03/2019 à 11:06, Christophe Leroy a écrit :
> Three subarches support hugepages:
> - fsl book3e
> - book3s/64
> - 8xx
>
> This patch splits asm/hugetlb.h to reduce the #ifdef mess.
>
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> ---
> arch/powerpc/include/asm/book3s/64/hugetlb.h | 41 +++++++++++
> arch/powerpc/include/asm/hugetlb.h | 89 ++----------------------
> arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h | 32 +++++++++
> arch/powerpc/include/asm/nohash/hugetlb-book3e.h | 31 +++++++++
> 4 files changed, 108 insertions(+), 85 deletions(-)
> create mode 100644 arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h
> create mode 100644 arch/powerpc/include/asm/nohash/hugetlb-book3e.h
>
> diff --git a/arch/powerpc/include/asm/book3s/64/hugetlb.h b/arch/powerpc/include/asm/book3s/64/hugetlb.h
> index ec2a55a553c7..2f9cf2bc601c 100644
> --- a/arch/powerpc/include/asm/book3s/64/hugetlb.h
> +++ b/arch/powerpc/include/asm/book3s/64/hugetlb.h
> @@ -62,4 +62,45 @@ extern pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
> extern void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
> unsigned long addr, pte_t *ptep,
> pte_t old_pte, pte_t new_pte);
> +/*
> + * This should work for other subarchs too. But right now we use the
> + * new format only for 64bit book3s
> + */
> +static inline pte_t *hugepd_page(hugepd_t hpd)
> +{
> + if (WARN_ON(!hugepd_ok(hpd)))
> + return NULL;
> + /*
> + * We have only four bits to encode, MMU page size
> + */
> + BUILD_BUG_ON((MMU_PAGE_COUNT - 1) > 0xf);
> + return __va(hpd_val(hpd) & HUGEPD_ADDR_MASK);
> +}
> +
> +static inline unsigned int hugepd_mmu_psize(hugepd_t hpd)
> +{
> + return (hpd_val(hpd) & HUGEPD_SHIFT_MASK) >> 2;
> +}
> +
> +static inline unsigned int hugepd_shift(hugepd_t hpd)
> +{
> + return mmu_psize_to_shift(hugepd_mmu_psize(hpd));
> +}
> +static inline void flush_hugetlb_page(struct vm_area_struct *vma,
> + unsigned long vmaddr)
> +{
> + if (radix_enabled())
> + return radix__flush_hugetlb_page(vma, vmaddr);
> +}
> +
> +static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
> + unsigned int pdshift)
> +{
> + unsigned long idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(hpd);
> +
> + return hugepd_page(hpd) + idx;
> +}
> +
> +void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
> +
> #endif
> diff --git a/arch/powerpc/include/asm/hugetlb.h b/arch/powerpc/include/asm/hugetlb.h
> index 48c29686c78e..fd5c0873a57d 100644
> --- a/arch/powerpc/include/asm/hugetlb.h
> +++ b/arch/powerpc/include/asm/hugetlb.h
> @@ -6,85 +6,13 @@
> #include <asm/page.h>
>
> #ifdef CONFIG_PPC_BOOK3S_64
> -
> #include <asm/book3s/64/hugetlb.h>
> -/*
> - * This should work for other subarchs too. But right now we use the
> - * new format only for 64bit book3s
> - */
> -static inline pte_t *hugepd_page(hugepd_t hpd)
> -{
> - if (WARN_ON(!hugepd_ok(hpd)))
> - return NULL;
> - /*
> - * We have only four bits to encode, MMU page size
> - */
> - BUILD_BUG_ON((MMU_PAGE_COUNT - 1) > 0xf);
> - return __va(hpd_val(hpd) & HUGEPD_ADDR_MASK);
> -}
> -
> -static inline unsigned int hugepd_mmu_psize(hugepd_t hpd)
> -{
> - return (hpd_val(hpd) & HUGEPD_SHIFT_MASK) >> 2;
> -}
> -
> -static inline unsigned int hugepd_shift(hugepd_t hpd)
> -{
> - return mmu_psize_to_shift(hugepd_mmu_psize(hpd));
> -}
> -static inline void flush_hugetlb_page(struct vm_area_struct *vma,
> - unsigned long vmaddr)
> -{
> - if (radix_enabled())
> - return radix__flush_hugetlb_page(vma, vmaddr);
> -}
> -
> -#else
> -
> -static inline pte_t *hugepd_page(hugepd_t hpd)
> -{
> - if (WARN_ON(!hugepd_ok(hpd)))
> - return NULL;
> -#ifdef CONFIG_PPC_8xx
> - return (pte_t *)__va(hpd_val(hpd) & ~HUGEPD_SHIFT_MASK);
> -#else
> - return (pte_t *)((hpd_val(hpd) &
> - ~HUGEPD_SHIFT_MASK) | PD_HUGE);
> -#endif
> -}
> -
> -static inline unsigned int hugepd_shift(hugepd_t hpd)
> -{
> -#ifdef CONFIG_PPC_8xx
> - return ((hpd_val(hpd) & _PMD_PAGE_MASK) >> 1) + 17;
> -#else
> - return hpd_val(hpd) & HUGEPD_SHIFT_MASK;
> -#endif
> -}
> -
> +#elif defined(CONFIG_PPC_FSL_BOOK3E)
> +#include <asm/nohash/hugetlb-book3e.h>
> +#elif defined(CONFIG_PPC_8xx)
> +#include <asm/nohash/32/hugetlb-8xx.h>
> #endif /* CONFIG_PPC_BOOK3S_64 */
>
> -
> -static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
> - unsigned pdshift)
> -{
> - /*
> - * On FSL BookE, we have multiple higher-level table entries that
> - * point to the same hugepte. Just use the first one since they're all
> - * identical. So for that case, idx=0.
> - */
> - unsigned long idx = 0;
> -
> - pte_t *dir = hugepd_page(hpd);
> -#ifdef CONFIG_PPC_8xx
> - idx = (addr & ((1UL << pdshift) - 1)) >> PAGE_SHIFT;
> -#elif !defined(CONFIG_PPC_FSL_BOOK3E)
> - idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(hpd);
> -#endif
> -
> - return dir + idx;
> -}
> -
> void flush_dcache_icache_hugepage(struct page *page);
>
> int slice_is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
> @@ -101,15 +29,6 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
>
> void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
> pte_t pte);
> -#ifdef CONFIG_PPC_8xx
> -static inline void flush_hugetlb_page(struct vm_area_struct *vma,
> - unsigned long vmaddr)
> -{
> - flush_tlb_page(vma, vmaddr);
> -}
> -#else
> -void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
> -#endif
>
> #define __HAVE_ARCH_HUGETLB_FREE_PGD_RANGE
> void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
> diff --git a/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h b/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h
> new file mode 100644
> index 000000000000..209e6a219835
> --- /dev/null
> +++ b/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h
> @@ -0,0 +1,32 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H
> +#define _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H
> +
> +static inline pte_t *hugepd_page(hugepd_t hpd)
> +{
> + if (WARN_ON(!hugepd_ok(hpd)))
> + return NULL;
> +
> + return (pte_t *)__va(hpd_val(hpd) & ~HUGEPD_SHIFT_MASK);
> +}
> +
> +static inline unsigned int hugepd_shift(hugepd_t hpd)
> +{
> + return ((hpd_val(hpd) & _PMD_PAGE_MASK) >> 1) + 17;
> +}
> +
> +static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
> + unsigned int pdshift)
> +{
> + unsigned long idx = (addr & ((1UL << pdshift) - 1)) >> PAGE_SHIFT;
> +
> + return hugepd_page(hpd) + idx;
> +}
> +
> +static inline void flush_hugetlb_page(struct vm_area_struct *vma,
> + unsigned long vmaddr)
> +{
> + flush_tlb_page(vma, vmaddr);
> +}
> +
> +#endif /* _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H */
> diff --git a/arch/powerpc/include/asm/nohash/hugetlb-book3e.h b/arch/powerpc/include/asm/nohash/hugetlb-book3e.h
> new file mode 100644
> index 000000000000..e94f1cd048ee
> --- /dev/null
> +++ b/arch/powerpc/include/asm/nohash/hugetlb-book3e.h
> @@ -0,0 +1,31 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _ASM_POWERPC_NOHASH_HUGETLB_BOOK3E_H
> +#define _ASM_POWERPC_NOHASH_HUGETLB_BOOK3E_H
> +
> +static inline pte_t *hugepd_page(hugepd_t hpd)
> +{
> + if (WARN_ON(!hugepd_ok(hpd)))
> + return NULL;
> +
> + return (pte_t *)((hpd_val(hpd) & ~HUGEPD_SHIFT_MASK) | PD_HUGE);
> +}
> +
> +static inline unsigned int hugepd_shift(hugepd_t hpd)
> +{
> + return hpd_val(hpd) & HUGEPD_SHIFT_MASK;
> +}
> +
> +static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
> + unsigned int pdshift)
> +{
> + /*
> + * On FSL BookE, we have multiple higher-level table entries that
> + * point to the same hugepte. Just use the first one since they're all
> + * identical. So for that case, idx=0.
> + */
> + return hugepd_page(hpd);
> +}
> +
> +void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
> +
> +#endif /* _ASM_POWERPC_NOHASH_HUGETLB_BOOK3E_H */
>
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