linux-kernel - [PATCH v2 20/30] s390: Implement the new page table range API

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Message-Id: <20230227175741.71216-21-willy@infradead.org>
Date:   Mon, 27 Feb 2023 17:57:31 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-mm@...ck.org, linux-arch@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>, linux-s390@...r.kernel.org
Subject: [PATCH v2 20/30] s390: Implement the new page table range API

Add set_ptes() and update_mmu_cache_range().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Cc: Heiko Carstens <hca@...ux.ibm.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>
Cc: Alexander Gordeev <agordeev@...ux.ibm.com>
Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>
Cc: Sven Schnelle <svens@...ux.ibm.com>
Cc: linux-s390@...r.kernel.org
---
 arch/s390/include/asm/pgtable.h | 34 ++++++++++++++++++++++++---------
 1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 2c70b4d1263d..46bf475116f1 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -50,6 +50,7 @@ void arch_report_meminfo(struct seq_file *m);
  * tables contain all the necessary information.
  */
 #define update_mmu_cache(vma, address, ptep)     do { } while (0)
+#define update_mmu_cache_range(vma, addr, ptep, nr)	do { } while (0)
 #define update_mmu_cache_pmd(vma, address, ptep) do { } while (0)
 
 /*
@@ -1317,21 +1318,36 @@ 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_pte_at(mm, addr, ptep, pte) set_ptes(mm, addr, ptep, pte, 1)
+
 /*
  * Conversion functions: convert a page and protection to a page entry,
  * and a page entry and page directory to the page they refer to.
-- 
2.39.1