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    Subject[PATCH v5 23/38] s390: Implement the new page table range API
    Date
    Add set_ptes() and update_mmu_cache_range().

    Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
    Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
    Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
    Cc: Heiko Carstens <hca@linux.ibm.com>
    Cc: Vasily Gorbik <gor@linux.ibm.com>
    Cc: Alexander Gordeev <agordeev@linux.ibm.com>
    Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
    Cc: Sven Schnelle <svens@linux.ibm.com>
    Cc: linux-s390@vger.kernel.org
    ---
    arch/s390/include/asm/pgtable.h | 33 ++++++++++++++++++++++++---------
    1 file changed, 24 insertions(+), 9 deletions(-)

    diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
    index c55f3c3365af..02973c740a5b 100644
    --- a/arch/s390/include/asm/pgtable.h
    +++ b/arch/s390/include/asm/pgtable.h
    @@ -47,6 +47,7 @@ static inline void update_page_count(int level, long count)
    * tables contain all the necessary information.
    */
    #define update_mmu_cache(vma, address, ptep) do { } while (0)
    +#define update_mmu_cache_range(vmf, vma, addr, ptep, nr) do { } while (0)
    #define update_mmu_cache_pmd(vma, address, ptep) do { } while (0)

    /*
    @@ -1316,20 +1317,34 @@ pgprot_t pgprot_writecombine(pgprot_t prot);
    pgprot_t pgprot_writethrough(pgprot_t prot);

    /*
    - * Certain architectures need to do special things when PTEs
    - * within a page table are directly modified. Thus, the following
    - * hook is made available.
    + * Set multiple PTEs to consecutive pages with a single call. All PTEs
    + * are within the same folio, PMD and VMA.
    */
    -static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
    - pte_t *ptep, pte_t entry)
    +static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
    + pte_t *ptep, pte_t entry, unsigned int nr)
    {
    if (pte_present(entry))
    entry = clear_pte_bit(entry, __pgprot(_PAGE_UNUSED));
    - if (mm_has_pgste(mm))
    - ptep_set_pte_at(mm, addr, ptep, entry);
    - else
    - set_pte(ptep, entry);
    + if (mm_has_pgste(mm)) {
    + for (;;) {
    + ptep_set_pte_at(mm, addr, ptep, entry);
    + if (--nr == 0)
    + break;
    + ptep++;
    + entry = __pte(pte_val(entry) + PAGE_SIZE);
    + addr += PAGE_SIZE;
    + }
    + } else {
    + for (;;) {
    + set_pte(ptep, entry);
    + if (--nr == 0)
    + break;
    + ptep++;
    + entry = __pte(pte_val(entry) + PAGE_SIZE);
    + }
    + }
    }
    +#define set_ptes set_ptes

    /*
    * Conversion functions: convert a page and protection to a page entry,
    --
    2.39.2
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