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Message-Id: <20230227175741.71216-16-willy@infradead.org>
Date: Mon, 27 Feb 2023 17:57:26 +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, Dinh Nguyen <dinguyen@...nel.org>
Subject: [PATCH v2 15/30] nios2: Implement the new page table range API
Add set_ptes(), update_mmu_cache_range(), flush_icache_pages() and
flush_dcache_folio(). Change the PG_arch_1 (aka PG_dcache_dirty) flag
from being per-page to per-folio.
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Cc: Dinh Nguyen <dinguyen@...nel.org>
---
arch/nios2/include/asm/cacheflush.h | 6 ++-
arch/nios2/include/asm/pgtable.h | 27 +++++++++----
arch/nios2/mm/cacheflush.c | 61 ++++++++++++++++-------------
3 files changed, 58 insertions(+), 36 deletions(-)
diff --git a/arch/nios2/include/asm/cacheflush.h b/arch/nios2/include/asm/cacheflush.h
index d0b71dd71287..8624ca83cffe 100644
--- a/arch/nios2/include/asm/cacheflush.h
+++ b/arch/nios2/include/asm/cacheflush.h
@@ -29,9 +29,13 @@ extern void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
unsigned long pfn);
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
void flush_dcache_page(struct page *page);
+void flush_dcache_folio(struct folio *folio);
+#define flush_dcache_folio flush_dcache_folio
extern void flush_icache_range(unsigned long start, unsigned long end);
-extern void flush_icache_page(struct vm_area_struct *vma, struct page *page);
+void flush_icache_pages(struct vm_area_struct *vma, struct page *page,
+ unsigned int nr);
+#define flush_icache_page(vma, page) flush_icache_pages(vma, page, 1);
#define flush_cache_vmap(start, end) flush_dcache_range(start, end)
#define flush_cache_vunmap(start, end) flush_dcache_range(start, end)
diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h
index 0f5c2564e9f5..8a77821a17a5 100644
--- a/arch/nios2/include/asm/pgtable.h
+++ b/arch/nios2/include/asm/pgtable.h
@@ -178,15 +178,23 @@ static inline void set_pte(pte_t *ptep, pte_t pteval)
*ptep = pteval;
}
-static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
- pte_t *ptep, pte_t pteval)
+static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pte, unsigned int nr)
{
- unsigned long paddr = (unsigned long)page_to_virt(pte_page(pteval));
-
- flush_dcache_range(paddr, paddr + PAGE_SIZE);
- set_pte(ptep, pteval);
+ unsigned long paddr = (unsigned long)page_to_virt(pte_page(pte));
+
+ flush_dcache_range(paddr, paddr + nr * PAGE_SIZE);
+ for (;;) {
+ set_pte(ptep, pte);
+ if (--nr == 0)
+ break;
+ ptep++;
+ pte_val(pte) += 1;
+ }
}
+#define set_pte_at(mm, addr, ptep, pte) set_ptes(mm, addr, ptep, pte, 1)
+
static inline int pmd_none(pmd_t pmd)
{
return (pmd_val(pmd) ==
@@ -273,7 +281,10 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
extern void __init paging_init(void);
extern void __init mmu_init(void);
-extern void update_mmu_cache(struct vm_area_struct *vma,
- unsigned long address, pte_t *pte);
+void update_mmu_cache_range(struct vm_area_struct *vma, unsigned long address,
+ pte_t *ptep, unsigned int nr);
+
+#define update_mmu_cache(vma, addr, ptep) \
+ update_mmu_cache_range(vma, addr, ptep, 1)
#endif /* _ASM_NIOS2_PGTABLE_H */
diff --git a/arch/nios2/mm/cacheflush.c b/arch/nios2/mm/cacheflush.c
index 6aa9257c3ede..471485a84b2c 100644
--- a/arch/nios2/mm/cacheflush.c
+++ b/arch/nios2/mm/cacheflush.c
@@ -138,10 +138,11 @@ void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
__flush_icache(start, end);
}
-void flush_icache_page(struct vm_area_struct *vma, struct page *page)
+void flush_icache_pages(struct vm_area_struct *vma, struct page *page,
+ unsigned int nr)
{
unsigned long start = (unsigned long) page_address(page);
- unsigned long end = start + PAGE_SIZE;
+ unsigned long end = start + nr * PAGE_SIZE;
__flush_dcache(start, end);
__flush_icache(start, end);
@@ -158,19 +159,19 @@ void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
__flush_icache(start, end);
}
-void __flush_dcache_page(struct address_space *mapping, struct page *page)
+void __flush_dcache_folio(struct address_space *mapping, struct folio *folio)
{
/*
* Writeback any data associated with the kernel mapping of this
* page. This ensures that data in the physical page is mutually
* coherent with the kernels mapping.
*/
- unsigned long start = (unsigned long)page_address(page);
+ unsigned long start = (unsigned long)folio_address(folio);
- __flush_dcache(start, start + PAGE_SIZE);
+ __flush_dcache(start, start + folio_size(folio));
}
-void flush_dcache_page(struct page *page)
+void flush_dcache_folio(struct folio *folio)
{
struct address_space *mapping;
@@ -178,32 +179,38 @@ void flush_dcache_page(struct page *page)
* The zero page is never written to, so never has any dirty
* cache lines, and therefore never needs to be flushed.
*/
- if (page == ZERO_PAGE(0))
+ if (is_zero_pfn(folio_pfn(folio)))
return;
- mapping = page_mapping_file(page);
+ mapping = folio_flush_mapping(folio);
/* Flush this page if there are aliases. */
if (mapping && !mapping_mapped(mapping)) {
- clear_bit(PG_dcache_clean, &page->flags);
+ clear_bit(PG_dcache_clean, &folio->flags);
} else {
- __flush_dcache_page(mapping, page);
+ __flush_dcache_folio(mapping, folio);
if (mapping) {
- unsigned long start = (unsigned long)page_address(page);
- flush_aliases(mapping, page);
- flush_icache_range(start, start + PAGE_SIZE);
+ unsigned long start = (unsigned long)folio_address(folio);
+ flush_aliases(mapping, folio);
+ flush_icache_range(start, start + folio_size(folio));
}
- set_bit(PG_dcache_clean, &page->flags);
+ set_bit(PG_dcache_clean, &folio->flags);
}
}
-EXPORT_SYMBOL(flush_dcache_page);
+EXPORT_SYMBOL(flush_dcache_folio);
+
+void flush_dcache_page(struct page *page)
+{
+ flush_dcache_folio(page_folio(page));
+}
+EXPORT_SYMBOL(flush_dcache_folio);
-void update_mmu_cache(struct vm_area_struct *vma,
- unsigned long address, pte_t *ptep)
+void update_mmu_cache_range(struct vm_area_struct *vma, unsigned long address,
+ pte_t *ptep, unsigned int nr)
{
pte_t pte = *ptep;
unsigned long pfn = pte_pfn(pte);
- struct page *page;
+ struct folio *folio;
struct address_space *mapping;
reload_tlb_page(vma, address, pte);
@@ -215,19 +222,19 @@ void update_mmu_cache(struct vm_area_struct *vma,
* The zero page is never written to, so never has any dirty
* cache lines, and therefore never needs to be flushed.
*/
- page = pfn_to_page(pfn);
- if (page == ZERO_PAGE(0))
+ if (is_zero_pfn(pfn))
return;
- mapping = page_mapping_file(page);
- if (!test_and_set_bit(PG_dcache_clean, &page->flags))
- __flush_dcache_page(mapping, page);
+ folio = page_folio(pfn_to_page(pfn));
+ mapping = folio_flush_mapping(folio);
+ if (!test_and_set_bit(PG_dcache_clean, &folio->flags))
+ __flush_dcache_folio(mapping, folio);
- if(mapping)
- {
- flush_aliases(mapping, page);
+ if (mapping) {
+ flush_aliases(mapping, folio);
if (vma->vm_flags & VM_EXEC)
- flush_icache_page(vma, page);
+ flush_icache_pages(vma, &folio->page,
+ folio_nr_pages(folio));
}
}
--
2.39.1
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