parisc: implement the new page table range API

Add set_ptes(), update_mmu_cache_range(), flush_dcache_folio() and
flush_icache_pages().  Change the PG_arch_1 (aka PG_dcache_dirty) flag
from being per-page to per-folio.

Link: https://lkml.kernel.org/r/20230802151406.3735276-21-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 73 insertions, 34 deletions

diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index b55b35c89d6a..442109a48940 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -94,11 +94,11 @@ static inline void flush_data_cache(void)
 /* Kernel virtual address of pfn.  */
 #define pfn_va(pfn)	__va(PFN_PHYS(pfn))
 
-void
-__update_cache(pte_t pte)
+void __update_cache(pte_t pte)
 {
 	unsigned long pfn = pte_pfn(pte);
-	struct page *page;
+	struct folio *folio;
+	unsigned int nr;
 
 	/* We don't have pte special.  As a result, we can be called with
 	   an invalid pfn and we don't need to flush the kernel dcache page.
@@ -106,13 +106,17 @@ __update_cache(pte_t pte)
 	if (!pfn_valid(pfn))
 		return;
 
-	page = pfn_to_page(pfn);
-	if (page_mapping_file(page) &&
-	    test_bit(PG_dcache_dirty, &page->flags)) {
-		flush_kernel_dcache_page_addr(pfn_va(pfn));
-		clear_bit(PG_dcache_dirty, &page->flags);
+	folio = page_folio(pfn_to_page(pfn));
+	pfn = folio_pfn(folio);
+	nr = folio_nr_pages(folio);
+	if (folio_flush_mapping(folio) &&
+	    test_bit(PG_dcache_dirty, &folio->flags)) {
+		while (nr--)
+			flush_kernel_dcache_page_addr(pfn_va(pfn + nr));
+		clear_bit(PG_dcache_dirty, &folio->flags);
 	} else if (parisc_requires_coherency())
-		flush_kernel_dcache_page_addr(pfn_va(pfn));
+		while (nr--)
+			flush_kernel_dcache_page_addr(pfn_va(pfn + nr));
 }
 
 void
@@ -366,6 +370,20 @@ static void flush_user_cache_page(struct vm_area_struct *vma, unsigned long vmad
 	preempt_enable();
 }
 
+void flush_icache_pages(struct vm_area_struct *vma, struct page *page,
+		unsigned int nr)
+{
+	void *kaddr = page_address(page);
+
+	for (;;) {
+		flush_kernel_dcache_page_addr(kaddr);
+		flush_kernel_icache_page(kaddr);
+		if (--nr == 0)
+			break;
+		kaddr += PAGE_SIZE;
+	}
+}
+
 static inline pte_t *get_ptep(struct mm_struct *mm, unsigned long addr)
 {
 	pte_t *ptep = NULL;
@@ -394,27 +412,30 @@ static inline bool pte_needs_flush(pte_t pte)
 		== (_PAGE_PRESENT | _PAGE_ACCESSED);
 }
 
-void flush_dcache_page(struct page *page)
+void flush_dcache_folio(struct folio *folio)
 {
-	struct address_space *mapping = page_mapping_file(page);
-	struct vm_area_struct *mpnt;
-	unsigned long offset;
+	struct address_space *mapping = folio_flush_mapping(folio);
+	struct vm_area_struct *vma;
 	unsigned long addr, old_addr = 0;
+	void *kaddr;
 	unsigned long count = 0;
-	unsigned long flags;
+	unsigned long i, nr, flags;
 	pgoff_t pgoff;
 
 	if (mapping && !mapping_mapped(mapping)) {
-		set_bit(PG_dcache_dirty, &page->flags);
+		set_bit(PG_dcache_dirty, &folio->flags);
 		return;
 	}
 
-	flush_kernel_dcache_page_addr(page_address(page));
+	nr = folio_nr_pages(folio);
+	kaddr = folio_address(folio);
+	for (i = 0; i < nr; i++)
+		flush_kernel_dcache_page_addr(kaddr + i * PAGE_SIZE);
 
 	if (!mapping)
 		return;
 
-	pgoff = page->index;
+	pgoff = folio->index;
 
 	/*
 	 * We have carefully arranged in arch_get_unmapped_area() that
@@ -424,20 +445,33 @@ void flush_dcache_page(struct page *page)
 	 * on machines that support equivalent aliasing
 	 */
 	flush_dcache_mmap_lock_irqsave(mapping, flags);
-	vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
-		offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
-		addr = mpnt->vm_start + offset;
-		if (parisc_requires_coherency()) {
-			bool needs_flush = false;
-			pte_t *ptep;
+	vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff + nr - 1) {
+		unsigned long offset = pgoff - vma->vm_pgoff;
+		unsigned long pfn = folio_pfn(folio);
+
+		addr = vma->vm_start;
+		nr = folio_nr_pages(folio);
+		if (offset > -nr) {
+			pfn -= offset;
+			nr += offset;
+		} else {
+			addr += offset * PAGE_SIZE;
+		}
+		if (addr + nr * PAGE_SIZE > vma->vm_end)
+			nr = (vma->vm_end - addr) / PAGE_SIZE;
 
-			ptep = get_ptep(mpnt->vm_mm, addr);
-			if (ptep) {
-				needs_flush = pte_needs_flush(*ptep);
+		if (parisc_requires_coherency()) {
+			for (i = 0; i < nr; i++) {
+				pte_t *ptep = get_ptep(vma->vm_mm,
+							addr + i * PAGE_SIZE);
+				if (!ptep)
+					continue;
+				if (pte_needs_flush(*ptep))
+					flush_user_cache_page(vma,
+							addr + i * PAGE_SIZE);
+				/* Optimise accesses to the same table? */
 				pte_unmap(ptep);
 			}
-			if (needs_flush)
-				flush_user_cache_page(mpnt, addr);
 		} else {
 			/*
 			 * The TLB is the engine of coherence on parisc:
@@ -450,27 +484,32 @@ void flush_dcache_page(struct page *page)
 			 * in (until the user or kernel specifically
 			 * accesses it, of course)
 			 */
-			flush_tlb_page(mpnt, addr);
+			for (i = 0; i < nr; i++)
+				flush_tlb_page(vma, addr + i * PAGE_SIZE);
 			if (old_addr == 0 || (old_addr & (SHM_COLOUR - 1))
 					!= (addr & (SHM_COLOUR - 1))) {
-				__flush_cache_page(mpnt, addr, page_to_phys(page));
+				for (i = 0; i < nr; i++)
+					__flush_cache_page(vma,
+						addr + i * PAGE_SIZE,
+						(pfn + i) * PAGE_SIZE);
 				/*
 				 * Software is allowed to have any number
 				 * of private mappings to a page.
 				 */
-				if (!(mpnt->vm_flags & VM_SHARED))
+				if (!(vma->vm_flags & VM_SHARED))
 					continue;
 				if (old_addr)
 					pr_err("INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %pD\n",
-						old_addr, addr, mpnt->vm_file);
-				old_addr = addr;
+						old_addr, addr, vma->vm_file);
+				if (nr == folio_nr_pages(folio))
+					old_addr = addr;
 			}
 		}
 		WARN_ON(++count == 4096);
 	}
 	flush_dcache_mmap_unlock_irqrestore(mapping, flags);
 }
-EXPORT_SYMBOL(flush_dcache_page);
+EXPORT_SYMBOL(flush_dcache_folio);
 
 /* Defined in arch/parisc/kernel/pacache.S */
 EXPORT_SYMBOL(flush_kernel_dcache_range_asm);