sparc32: implement the new page table range API

Add PFN_PTE_SHIFT, update_mmu_cache_range(), flush_dcache_folio() and
flush_icache_pages().

Link: https://lkml.kernel.org/r/20230802151406.3735276-26-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/sparc/include/asm/cacheflush_32.h

@@ -2,6 +2,7 @@
 #ifndef _SPARC_CACHEFLUSH_H
 #define _SPARC_CACHEFLUSH_H
 
+#include <linux/page-flags.h>
 #include <asm/cachetlb_32.h>
 
 #define flush_cache_all() \
@@ -16,6 +17,7 @@
 	sparc32_cachetlb_ops->cache_page(vma, addr)
 #define flush_icache_range(start, end)		do { } while (0)
 #define flush_icache_page(vma, pg)		do { } while (0)
+#define flush_icache_pages(vma, pg, nr)		do { } while (0)
 
 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
 	do {							\
@@ -35,11 +37,15 @@
 #define flush_page_for_dma(addr) \
 	sparc32_cachetlb_ops->page_for_dma(addr)
 
-struct page;
 void sparc_flush_page_to_ram(struct page *page);
+void sparc_flush_folio_to_ram(struct folio *folio);
 
 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
-#define flush_dcache_page(page)			sparc_flush_page_to_ram(page)
+#define flush_dcache_folio(folio)		sparc_flush_folio_to_ram(folio)
+static inline void flush_dcache_page(struct page *page)
+{
+	flush_dcache_folio(page_folio(page));
+}
 #define flush_dcache_mmap_lock(mapping)		do { } while (0)
 #define flush_dcache_mmap_unlock(mapping)	do { } while (0)
 

arch/sparc/include/asm/pgtable_32.h

@@ -101,8 +101,6 @@ static inline void set_pte(pte_t *ptep, pte_t pteval)
 	srmmu_swap((unsigned long *)ptep, pte_val(pteval));
 }
 
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
-
 static inline int srmmu_device_memory(unsigned long x)
 {
 	return ((x & 0xF0000000) != 0);
@@ -256,6 +254,7 @@ static inline pte_t pte_mkyoung(pte_t pte)
 	return __pte(pte_val(pte) | SRMMU_REF);
 }
 
+#define PFN_PTE_SHIFT			(PAGE_SHIFT - 4)
 #define pfn_pte(pfn, prot)		mk_pte(pfn_to_page(pfn), prot)
 
 static inline unsigned long pte_pfn(pte_t pte)
@@ -268,7 +267,7 @@ static inline unsigned long pte_pfn(pte_t pte)
 		 */
 		return ~0UL;
 	}
-	return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4);
+	return (pte_val(pte) & SRMMU_PTE_PMASK) >> PFN_PTE_SHIFT;
 }
 
 #define pte_page(pte)	pfn_to_page(pte_pfn(pte))
@@ -318,6 +317,7 @@ void mmu_info(struct seq_file *m);
 #define FAULT_CODE_USER     0x4
 
 #define update_mmu_cache(vma, address, ptep) do { } while (0)
+#define update_mmu_cache_range(vmf, vma, address, ptep, nr) do { } while (0)
 
 void srmmu_mapiorange(unsigned int bus, unsigned long xpa,
                       unsigned long xva, unsigned int len);
@@ -422,7 +422,7 @@ static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 ({									  \
 	int __changed = !pte_same(*(__ptep), __entry);			  \
 	if (__changed) {						  \
-		set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
+		set_pte(__ptep, __entry);				  \
 		flush_tlb_page(__vma, __address);			  \
 	}								  \
 	__changed;							  \

arch/sparc/mm/init_32.c

@@ -297,11 +297,20 @@ void sparc_flush_page_to_ram(struct page *page)
 {
 	unsigned long vaddr = (unsigned long)page_address(page);
 
-	if (vaddr)
-		__flush_page_to_ram(vaddr);
+	__flush_page_to_ram(vaddr);
 }
 EXPORT_SYMBOL(sparc_flush_page_to_ram);
 
+void sparc_flush_folio_to_ram(struct folio *folio)
+{
+	unsigned long vaddr = (unsigned long)folio_address(folio);
+	unsigned int i, nr = folio_nr_pages(folio);
+
+	for (i = 0; i < nr; i++)
+		__flush_page_to_ram(vaddr + i * PAGE_SIZE);
+}
+EXPORT_SYMBOL(sparc_flush_folio_to_ram);
+
 static const pgprot_t protection_map[16] = {
 	[VM_NONE]					= PAGE_NONE,
 	[VM_READ]					= PAGE_READONLY,