[PATCH 5/7] alpha: Implement the new page table range API

Matthew Wilcox (Oracle)
2023-02-11T03:40:09Z

Add set_ptes(), update_mmu_cache_range() and flush_icache_pages().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
arch/alpha/include/asm/cacheflush.h | 10 ++++++++++
arch/alpha/include/asm/pgtable.h | 18 +++++++++++++++++-
2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/arch/alpha/include/asm/cacheflush.h b/arch/alpha/include/asm/cacheflush.h
index 9945ff483eaf..3956460e69e2 100644
--- a/arch/alpha/include/asm/cacheflush.h
+++ b/arch/alpha/include/asm/cacheflush.h
@@ -57,6 +57,16 @@ extern void flush_icache_user_page(struct vm_area_struct *vma,
#define flush_icache_page(vma, page) \
flush_icache_user_page((vma), (page), 0, 0)

+/*
+ * Both implementations of flush_icache_user_page flush the entire
+ * address space, so one call, no matter how many pages.
+ */
+static inline void flush_icache_pages(struct vm_area_struct *vma,
+ struct page *page, unsigned int nr)
+{
+ flush_icache_user_page(vma, page, 0, 0);
+}
+
#include <asm-generic/cacheflush.h>

#endif /* _ALPHA_CACHEFLUSH_H */
diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h
index ba43cb841d19..1e3354e9731b 100644
--- a/arch/alpha/include/asm/pgtable.h
+++ b/arch/alpha/include/asm/pgtable.h
@@ -26,7 +26,18 @@ struct vm_area_struct;
* hook is made available.
*/
#define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+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) += 1UL << 32;
+ }
+}
+#define set_pte_at(mm, addr, ptep, pte) set_ptes(mm, addr, ptep, pte, 1)

/* PMD_SHIFT determines the size of the area a second-level page table can map */
#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3))
@@ -303,6 +314,11 @@ extern inline void update_mmu_cache(struct vm_area_struct * vma,
{
}

+static inline void update_mmu_cache_range(struct vm_area_struct *vma,
+ unsigned long address, pte_t *ptep, unsigned int nr)
+{
+}
+
/*
* Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
* are !pte_none() && !pte_present().
--
2.39.1