Commit 843f9310 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Andrew Morton
Browse files

s390: implement the new page table range API 

Add set_ptes() and update_mmu_cache_range().

Link: https://lkml.kernel.org/r/20230802151406.3735276-24-willy@infradead.org


Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: default avatarGerald Schaefer <gerald.schaefer@linux.ibm.com>
Acked-by: default avatarMike 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>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 864609c6

arch/s390/include/asm/pgtable.h

+24 −9
Original line number Diff line number Diff line
@@ -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))

	if (mm_has_pgste(mm)) {

		for (;;) {

			ptep_set_pte_at(mm, addr, ptep, entry);

	else

			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,