linux-kernel - [PATCH v3 10/34] hexagon: Implement the new page table range API

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Date:   Tue, 28 Feb 2023 21:37:13 +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, Brian Cain <bcain@...cinc.com>
Subject: [PATCH v3 10/34] hexagon: Implement the new page table range API

Add set_ptes() and update_mmu_cache_range().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Acked-by: Brian Cain <bcain@...cinc.com>
---
 arch/hexagon/include/asm/cacheflush.h |  7 +++++--
 arch/hexagon/include/asm/pgtable.h    | 16 ++++++++++++++--
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/arch/hexagon/include/asm/cacheflush.h b/arch/hexagon/include/asm/cacheflush.h
index 6eff0730e6ef..63ca314ede89 100644
--- a/arch/hexagon/include/asm/cacheflush.h
+++ b/arch/hexagon/include/asm/cacheflush.h
@@ -58,12 +58,15 @@ extern void flush_cache_all_hexagon(void);
  * clean the cache when the PTE is set.
  *
  */
-static inline void update_mmu_cache(struct vm_area_struct *vma,
-					unsigned long address, pte_t *ptep)
+static inline void update_mmu_cache_range(struct vm_area_struct *vma,
+		unsigned long address, pte_t *ptep, unsigned int nr)
 {
 	/*  generic_ptrace_pokedata doesn't wind up here, does it?  */
 }
 
+#define update_mmu_cache(vma, addr, ptep) \
+	update_mmu_cache_range(vma, addr, ptep, 1)
+
 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
 		       unsigned long vaddr, void *dst, void *src, int len);
 #define copy_to_user_page copy_to_user_page
diff --git a/arch/hexagon/include/asm/pgtable.h b/arch/hexagon/include/asm/pgtable.h
index 59393613d086..f58f1d920769 100644
--- a/arch/hexagon/include/asm/pgtable.h
+++ b/arch/hexagon/include/asm/pgtable.h
@@ -346,12 +346,24 @@ static inline int pte_exec(pte_t pte)
 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
 
 /*
- * set_pte_at - update page table and do whatever magic may be
+ * set_ptes - update page table and do whatever magic may be
  * necessary to make the underlying hardware/firmware take note.
  *
  * VM may require a virtual instruction to alert the MMU.
  */
-#define set_pte_at(mm, addr, ptep, pte) set_pte(ptep, pte)
+static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
+		pte_t *ptep, pte_t pte, unsigned int nr)
+{
+	for (;;) {
+		set_pte(ptep, pte);
+		if (--nr == 0)
+			break;
+		ptep++;
+		pte_val(pte) += PAGE_SIZE;
+	}
+}
+
+#define set_pte_at(mm, addr, ptep, pte) set_ptes(mm, addr, ptep, pte, 1)
 
 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 {
-- 
2.39.1