patches/old/arm-implement-the-new-page-table-range-api.patch

From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: arm: implement the new page table range API
Date: Wed, 2 Aug 2023 16:13:37 +0100

Add set_ptes(), update_mmu_cache_range(), flush_dcache_folio() and
flush_icache_pages().  Change the PG_dcache_clear flag from being per-page
to per-folio which makes __dma_page_dev_to_cpu() a bit more exciting. 
Also add flush_cache_pages(), even though this isn't used by generic code
(yet?)

[m.szyprowski@samsung.com: fix potential endless loop in __dma_page_dev_to_cpu()]
  Link: https://lkml.kernel.org/r/20230809172737.3574190-1-m.szyprowski@samsung.com
[willy@infradead.org: fix folio conversion in __dma_page_dev_to_cpu()]
  Link: https://lkml.kernel.org/r/20230823191852.1556561-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20230802151406.3735276-10-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm/include/asm/cacheflush.h |   24 ++++--
 arch/arm/include/asm/pgtable.h    |    5 -
 arch/arm/include/asm/tlbflush.h   |   14 ++-
 arch/arm/mm/copypage-v4mc.c       |    5 -
 arch/arm/mm/copypage-v6.c         |    5 -
 arch/arm/mm/copypage-xscale.c     |    5 -
 arch/arm/mm/dma-mapping.c         |   26 +++----
 arch/arm/mm/fault-armv.c          |   16 ++--
 arch/arm/mm/flush.c               |   99 ++++++++++++++++------------
 arch/arm/mm/mm.h                  |    2 
 arch/arm/mm/mmu.c                 |   14 ++-
 arch/arm/mm/nommu.c               |    6 +
 12 files changed, 135 insertions(+), 86 deletions(-)

--- a/arch/arm/include/asm/cacheflush.h~arm-implement-the-new-page-table-range-api
+++ a/arch/arm/include/asm/cacheflush.h
@@ -231,14 +231,15 @@ vivt_flush_cache_range(struct vm_area_st
 					vma->vm_flags);
 }
 
-static inline void
-vivt_flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn)
+static inline void vivt_flush_cache_pages(struct vm_area_struct *vma,
+		unsigned long user_addr, unsigned long pfn, unsigned int nr)
 {
 	struct mm_struct *mm = vma->vm_mm;
 
 	if (!mm || cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm))) {
 		unsigned long addr = user_addr & PAGE_MASK;
-		__cpuc_flush_user_range(addr, addr + PAGE_SIZE, vma->vm_flags);
+		__cpuc_flush_user_range(addr, addr + nr * PAGE_SIZE,
+				vma->vm_flags);
 	}
 }
 
@@ -247,15 +248,17 @@ vivt_flush_cache_page(struct vm_area_str
 		vivt_flush_cache_mm(mm)
 #define flush_cache_range(vma,start,end) \
 		vivt_flush_cache_range(vma,start,end)
-#define flush_cache_page(vma,addr,pfn) \
-		vivt_flush_cache_page(vma,addr,pfn)
+#define flush_cache_pages(vma, addr, pfn, nr) \
+		vivt_flush_cache_pages(vma, addr, pfn, nr)
 #else
-extern void flush_cache_mm(struct mm_struct *mm);
-extern void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
-extern void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn);
+void flush_cache_mm(struct mm_struct *mm);
+void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
+void flush_cache_pages(struct vm_area_struct *vma, unsigned long user_addr,
+		unsigned long pfn, unsigned int nr);
 #endif
 
 #define flush_cache_dup_mm(mm) flush_cache_mm(mm)
+#define flush_cache_page(vma, addr, pfn) flush_cache_pages(vma, addr, pfn, 1)
 
 /*
  * flush_icache_user_range is used when we want to ensure that the
@@ -289,7 +292,9 @@ extern void flush_cache_page(struct vm_a
  * See update_mmu_cache for the user space part.
  */
 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
-extern void flush_dcache_page(struct page *);
+void flush_dcache_page(struct page *);
+void flush_dcache_folio(struct folio *folio);
+#define flush_dcache_folio flush_dcache_folio
 
 #define ARCH_IMPLEMENTS_FLUSH_KERNEL_VMAP_RANGE 1
 static inline void flush_kernel_vmap_range(void *addr, int size)
@@ -321,6 +326,7 @@ static inline void flush_anon_page(struc
  * duplicate cache flushing elsewhere performed by flush_dcache_page().
  */
 #define flush_icache_page(vma,page)	do { } while (0)
+#define flush_icache_pages(vma, page, nr)	do { } while (0)
 
 /*
  * flush_cache_vmap() is used when creating mappings (eg, via vmap,
--- a/arch/arm/include/asm/pgtable.h~arm-implement-the-new-page-table-range-api
+++ a/arch/arm/include/asm/pgtable.h
@@ -207,8 +207,9 @@ static inline void __sync_icache_dcache(
 extern void __sync_icache_dcache(pte_t pteval);
 #endif
 
-void set_pte_at(struct mm_struct *mm, unsigned long addr,
-		      pte_t *ptep, pte_t pteval);
+void set_ptes(struct mm_struct *mm, unsigned long addr,
+		      pte_t *ptep, pte_t pteval, unsigned int nr);
+#define set_ptes set_ptes
 
 static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot)
 {
--- a/arch/arm/include/asm/tlbflush.h~arm-implement-the-new-page-table-range-api
+++ a/arch/arm/include/asm/tlbflush.h
@@ -619,18 +619,22 @@ extern void flush_bp_all(void);
  * If PG_dcache_clean is not set for the page, we need to ensure that any
  * cache entries for the kernels virtual memory range are written
  * back to the page. On ARMv6 and later, the cache coherency is handled via
- * the set_pte_at() function.
+ * the set_ptes() function.
  */
 #if __LINUX_ARM_ARCH__ < 6
-extern void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
-	pte_t *ptep);
+void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
+		unsigned long addr, pte_t *ptep, unsigned int nr);
 #else
-static inline void update_mmu_cache(struct vm_area_struct *vma,
-				    unsigned long addr, pte_t *ptep)
+static inline void update_mmu_cache_range(struct vm_fault *vmf,
+		struct vm_area_struct *vma, unsigned long addr, pte_t *ptep,
+		unsigned int nr)
 {
 }
 #endif
 
+#define update_mmu_cache(vma, addr, ptep) \
+	update_mmu_cache_range(NULL, vma, addr, ptep, 1)
+
 #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0)
 
 #endif
--- a/arch/arm/mm/copypage-v4mc.c~arm-implement-the-new-page-table-range-api
+++ a/arch/arm/mm/copypage-v4mc.c
@@ -64,10 +64,11 @@ static void mc_copy_user_page(void *from
 void v4_mc_copy_user_highpage(struct page *to, struct page *from,
 	unsigned long vaddr, struct vm_area_struct *vma)
 {
+	struct folio *src = page_folio(from);
 	void *kto = kmap_atomic(to);
 
-	if (!test_and_set_bit(PG_dcache_clean, &from->flags))
-		__flush_dcache_page(page_mapping_file(from), from);
+	if (!test_and_set_bit(PG_dcache_clean, &src->flags))
+		__flush_dcache_folio(folio_flush_mapping(src), src);
 
 	raw_spin_lock(&minicache_lock);
 
--- a/arch/arm/mm/copypage-v6.c~arm-implement-the-new-page-table-range-api
+++ a/arch/arm/mm/copypage-v6.c
@@ -69,11 +69,12 @@ static void discard_old_kernel_data(void
 static void v6_copy_user_highpage_aliasing(struct page *to,
 	struct page *from, unsigned long vaddr, struct vm_area_struct *vma)
 {
+	struct folio *src = page_folio(from);
 	unsigned int offset = CACHE_COLOUR(vaddr);
 	unsigned long kfrom, kto;
 
-	if (!test_and_set_bit(PG_dcache_clean, &from->flags))
-		__flush_dcache_page(page_mapping_file(from), from);
+	if (!test_and_set_bit(PG_dcache_clean, &src->flags))
+		__flush_dcache_folio(folio_flush_mapping(src), src);
 
 	/* FIXME: not highmem safe */
 	discard_old_kernel_data(page_address(to));
--- a/arch/arm/mm/copypage-xscale.c~arm-implement-the-new-page-table-range-api
+++ a/arch/arm/mm/copypage-xscale.c
@@ -84,10 +84,11 @@ static void mc_copy_user_page(void *from
 void xscale_mc_copy_user_highpage(struct page *to, struct page *from,
 	unsigned long vaddr, struct vm_area_struct *vma)
 {
+	struct folio *src = page_folio(from);
 	void *kto = kmap_atomic(to);
 
-	if (!test_and_set_bit(PG_dcache_clean, &from->flags))
-		__flush_dcache_page(page_mapping_file(from), from);
+	if (!test_and_set_bit(PG_dcache_clean, &src->flags))
+		__flush_dcache_folio(folio_flush_mapping(src), src);
 
 	raw_spin_lock(&minicache_lock);
 
--- a/arch/arm/mm/dma-mapping.c~arm-implement-the-new-page-table-range-api
+++ a/arch/arm/mm/dma-mapping.c
@@ -709,19 +709,21 @@ static void __dma_page_dev_to_cpu(struct
 	 * Mark the D-cache clean for these pages to avoid extra flushing.
 	 */
 	if (dir != DMA_TO_DEVICE && size >= PAGE_SIZE) {
-		unsigned long pfn;
-		size_t left = size;
+		struct folio *folio = pfn_folio(paddr / PAGE_SIZE);
+		size_t offset = offset_in_folio(folio, paddr);
 
-		pfn = page_to_pfn(page) + off / PAGE_SIZE;
-		off %= PAGE_SIZE;
-		if (off) {
-			pfn++;
-			left -= PAGE_SIZE - off;
-		}
-		while (left >= PAGE_SIZE) {
-			page = pfn_to_page(pfn++);
-			set_bit(PG_dcache_clean, &page->flags);
-			left -= PAGE_SIZE;
+		for (;;) {
+			size_t sz = folio_size(folio) - offset;
+
+			if (size < sz)
+				break;
+			if (!offset)
+				set_bit(PG_dcache_clean, &folio->flags);
+			offset = 0;
+			size -= sz;
+			if (!size)
+				break;
+			folio = folio_next(folio);
 		}
 	}
 }
--- a/arch/arm/mm/fault-armv.c~arm-implement-the-new-page-table-range-api
+++ a/arch/arm/mm/fault-armv.c
@@ -180,12 +180,12 @@ make_coherent(struct address_space *mapp
  *
  * Note that the pte lock will be held.
  */
-void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
-	pte_t *ptep)
+void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
+		unsigned long addr, pte_t *ptep, unsigned int nr)
 {
 	unsigned long pfn = pte_pfn(*ptep);
 	struct address_space *mapping;
-	struct page *page;
+	struct folio *folio;
 
 	if (!pfn_valid(pfn))
 		return;
@@ -194,13 +194,13 @@ void update_mmu_cache(struct vm_area_str
 	 * 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) {
 		if (cache_is_vivt())
 			make_coherent(mapping, vma, addr, ptep, pfn);
--- a/arch/arm/mm/flush.c~arm-implement-the-new-page-table-range-api
+++ a/arch/arm/mm/flush.c
@@ -95,10 +95,10 @@ void flush_cache_range(struct vm_area_st
 		__flush_icache_all();
 }
 
-void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn)
+void flush_cache_pages(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn, unsigned int nr)
 {
 	if (cache_is_vivt()) {
-		vivt_flush_cache_page(vma, user_addr, pfn);
+		vivt_flush_cache_pages(vma, user_addr, pfn, nr);
 		return;
 	}
 
@@ -196,29 +196,31 @@ void copy_to_user_page(struct vm_area_st
 #endif
 }
 
-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.
 	 */
-	if (!PageHighMem(page)) {
-		__cpuc_flush_dcache_area(page_address(page), page_size(page));
+	if (!folio_test_highmem(folio)) {
+		__cpuc_flush_dcache_area(folio_address(folio),
+					folio_size(folio));
 	} else {
 		unsigned long i;
 		if (cache_is_vipt_nonaliasing()) {
-			for (i = 0; i < compound_nr(page); i++) {
-				void *addr = kmap_atomic(page + i);
+			for (i = 0; i < folio_nr_pages(folio); i++) {
+				void *addr = kmap_local_folio(folio,
+								i * PAGE_SIZE);
 				__cpuc_flush_dcache_area(addr, PAGE_SIZE);
-				kunmap_atomic(addr);
+				kunmap_local(addr);
 			}
 		} else {
-			for (i = 0; i < compound_nr(page); i++) {
-				void *addr = kmap_high_get(page + i);
+			for (i = 0; i < folio_nr_pages(folio); i++) {
+				void *addr = kmap_high_get(folio_page(folio, i));
 				if (addr) {
 					__cpuc_flush_dcache_area(addr, PAGE_SIZE);
-					kunmap_high(page + i);
+					kunmap_high(folio_page(folio, i));
 				}
 			}
 		}
@@ -230,15 +232,14 @@ void __flush_dcache_page(struct address_
 	 * userspace colour, which is congruent with page->index.
 	 */
 	if (mapping && cache_is_vipt_aliasing())
-		flush_pfn_alias(page_to_pfn(page),
-				page->index << PAGE_SHIFT);
+		flush_pfn_alias(folio_pfn(folio), folio_pos(folio));
 }
 
-static void __flush_dcache_aliases(struct address_space *mapping, struct page *page)
+static void __flush_dcache_aliases(struct address_space *mapping, struct folio *folio)
 {
 	struct mm_struct *mm = current->active_mm;
-	struct vm_area_struct *mpnt;
-	pgoff_t pgoff;
+	struct vm_area_struct *vma;
+	pgoff_t pgoff, pgoff_end;
 
 	/*
 	 * There are possible user space mappings of this page:
@@ -246,21 +247,36 @@ static void __flush_dcache_aliases(struc
 	 *   data in the current VM view associated with this page.
 	 * - aliasing VIPT: we only need to find one mapping of this page.
 	 */
-	pgoff = page->index;
+	pgoff = folio->index;
+	pgoff_end = pgoff + folio_nr_pages(folio) - 1;
 
 	flush_dcache_mmap_lock(mapping);
-	vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
-		unsigned long offset;
+	vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff_end) {
+		unsigned long start, offset, pfn;
+		unsigned int nr;
 
 		/*
 		 * If this VMA is not in our MM, we can ignore it.
 		 */
-		if (mpnt->vm_mm != mm)
+		if (vma->vm_mm != mm)
 			continue;
-		if (!(mpnt->vm_flags & VM_MAYSHARE))
+		if (!(vma->vm_flags & VM_MAYSHARE))
 			continue;
-		offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
-		flush_cache_page(mpnt, mpnt->vm_start + offset, page_to_pfn(page));
+
+		start = vma->vm_start;
+		pfn = folio_pfn(folio);
+		nr = folio_nr_pages(folio);
+		offset = pgoff - vma->vm_pgoff;
+		if (offset > -nr) {
+			pfn -= offset;
+			nr += offset;
+		} else {
+			start += offset * PAGE_SIZE;
+		}
+		if (start + nr * PAGE_SIZE > vma->vm_end)
+			nr = (vma->vm_end - start) / PAGE_SIZE;
+
+		flush_cache_pages(vma, start, pfn, nr);
 	}
 	flush_dcache_mmap_unlock(mapping);
 }
@@ -269,7 +285,7 @@ static void __flush_dcache_aliases(struc
 void __sync_icache_dcache(pte_t pteval)
 {
 	unsigned long pfn;
-	struct page *page;
+	struct folio *folio;
 	struct address_space *mapping;
 
 	if (cache_is_vipt_nonaliasing() && !pte_exec(pteval))
@@ -279,14 +295,14 @@ void __sync_icache_dcache(pte_t pteval)
 	if (!pfn_valid(pfn))
 		return;
 
-	page = pfn_to_page(pfn);
+	folio = page_folio(pfn_to_page(pfn));
 	if (cache_is_vipt_aliasing())
-		mapping = page_mapping_file(page);
+		mapping = folio_flush_mapping(folio);
 	else
 		mapping = NULL;
 
-	if (!test_and_set_bit(PG_dcache_clean, &page->flags))
-		__flush_dcache_page(mapping, page);
+	if (!test_and_set_bit(PG_dcache_clean, &folio->flags))
+		__flush_dcache_folio(mapping, folio);
 
 	if (pte_exec(pteval))
 		__flush_icache_all();
@@ -312,7 +328,7 @@ void __sync_icache_dcache(pte_t pteval)
  * Note that we disable the lazy flush for SMP configurations where
  * the cache maintenance operations are not automatically broadcasted.
  */
-void flush_dcache_page(struct page *page)
+void flush_dcache_folio(struct folio *folio)
 {
 	struct address_space *mapping;
 
@@ -320,31 +336,36 @@ 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;
 
 	if (!cache_ops_need_broadcast() && cache_is_vipt_nonaliasing()) {
-		if (test_bit(PG_dcache_clean, &page->flags))
-			clear_bit(PG_dcache_clean, &page->flags);
+		if (test_bit(PG_dcache_clean, &folio->flags))
+			clear_bit(PG_dcache_clean, &folio->flags);
 		return;
 	}
 
-	mapping = page_mapping_file(page);
+	mapping = folio_flush_mapping(folio);
 
 	if (!cache_ops_need_broadcast() &&
-	    mapping && !page_mapcount(page))
-		clear_bit(PG_dcache_clean, &page->flags);
+	    mapping && !folio_mapped(folio))
+		clear_bit(PG_dcache_clean, &folio->flags);
 	else {
-		__flush_dcache_page(mapping, page);
+		__flush_dcache_folio(mapping, folio);
 		if (mapping && cache_is_vivt())
-			__flush_dcache_aliases(mapping, page);
+			__flush_dcache_aliases(mapping, folio);
 		else if (mapping)
 			__flush_icache_all();
-		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_page);
 /*
  * Flush an anonymous page so that users of get_user_pages()
  * can safely access the data.  The expected sequence is:
--- a/arch/arm/mm/mm.h~arm-implement-the-new-page-table-range-api
+++ a/arch/arm/mm/mm.h
@@ -45,7 +45,7 @@ struct mem_type {
 
 const struct mem_type *get_mem_type(unsigned int type);
 
-extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
+void __flush_dcache_folio(struct address_space *mapping, struct folio *folio);
 
 /*
  * ARM specific vm_struct->flags bits.
--- a/arch/arm/mm/mmu.c~arm-implement-the-new-page-table-range-api
+++ a/arch/arm/mm/mmu.c
@@ -1789,7 +1789,7 @@ void __init paging_init(const struct mac
 	bootmem_init();
 
 	empty_zero_page = virt_to_page(zero_page);
-	__flush_dcache_page(NULL, empty_zero_page);
+	__flush_dcache_folio(NULL, page_folio(empty_zero_page));
 }
 
 void __init early_mm_init(const struct machine_desc *mdesc)
@@ -1798,8 +1798,8 @@ void __init early_mm_init(const struct m
 	early_paging_init(mdesc);
 }
 
-void set_pte_at(struct mm_struct *mm, unsigned long addr,
-			      pte_t *ptep, pte_t pteval)
+void set_ptes(struct mm_struct *mm, unsigned long addr,
+			      pte_t *ptep, pte_t pteval, unsigned int nr)
 {
 	unsigned long ext = 0;
 
@@ -1809,5 +1809,11 @@ void set_pte_at(struct mm_struct *mm, un
 		ext |= PTE_EXT_NG;
 	}
 
-	set_pte_ext(ptep, pteval, ext);
+	for (;;) {
+		set_pte_ext(ptep, pteval, ext);
+		if (--nr == 0)
+			break;
+		ptep++;
+		pte_val(pteval) += PAGE_SIZE;
+	}
 }
--- a/arch/arm/mm/nommu.c~arm-implement-the-new-page-table-range-api
+++ a/arch/arm/mm/nommu.c
@@ -180,6 +180,12 @@ void setup_mm_for_reboot(void)
 {
 }
 
+void flush_dcache_folio(struct folio *folio)
+{
+	__cpuc_flush_dcache_area(folio_address(folio), folio_size(folio));
+}
+EXPORT_SYMBOL(flush_dcache_folio);
+
 void flush_dcache_page(struct page *page)
 {
 	__cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
_