Commit 665f6402 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Andrew Morton
Browse files

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.org


Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: default avatarMike Rapoport (IBM) <rppt@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 157efa29

arch/sparc/include/asm/cacheflush_32.h

+8 −2
Original line number Diff line number Diff line
@@ -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

+4 −4
Original line number Diff line number Diff line
@@ -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

+11 −2
Original line number Diff line number Diff line
@@ -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);

}

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,