Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 76d21d18 authored by Guo Ren's avatar Guo Ren
Browse files

csky: Fixup io-range page attribute for mmap("/dev/mem") 



Some user space drivers need accessing IO address and IO remap need
SO(strong order) page-attribute to make IO operation correct. So we
need add SO-page-attr for all non-memory address.

Signed-off-by: default avatarGuo Ren <ren_guo@c-sky.com>
Reported-by: default avatarFan Xiaodong <xiaodong.fan@boyahualu.com>
parent 0f231dcf

arch/csky/include/asm/pgtable.h

+5 −0
Original line number Diff line number Diff line
@@ -241,6 +241,11 @@ static inline pte_t pte_mkyoung(pte_t pte) 


#define pgd_index(address)	((address) >> PGDIR_SHIFT)



#define __HAVE_PHYS_MEM_ACCESS_PROT

struct file;

extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,

				     unsigned long size, pgprot_t vma_prot);



/*

 * Macro to make mark a page protection value as "uncacheable".  Note

 * that "protection" is really a misnomer here as the protection value

arch/csky/mm/ioremap.c

+14 −0
Original line number Diff line number Diff line
@@ -46,3 +46,17 @@ void iounmap(void __iomem *addr) 
	vunmap((void *)((unsigned long)addr & PAGE_MASK));

}

EXPORT_SYMBOL(iounmap);



pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,

			      unsigned long size, pgprot_t vma_prot)

{

	if (!pfn_valid(pfn)) {

		vma_prot.pgprot |= _PAGE_SO;

		return pgprot_noncached(vma_prot);

	} else if (file->f_flags & O_SYNC) {

		return pgprot_noncached(vma_prot);

	}



	return vma_prot;

}

EXPORT_SYMBOL(phys_mem_access_prot);