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: Guo Ren <ren_guo@c-sky.com>
Reported-by: Fan Xiaodong <xiaodong.fan@boyahualu.com>

diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h
index af7a7fa..dcea277 100644 (file)
--- a/arch/csky/include/asm/pgtable.h
+++ b/arch/csky/include/asm/pgtable.h
@@ -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

diff --git a/arch/csky/mm/ioremap.c b/arch/csky/mm/ioremap.c
index cb7c03e..8473b6b 100644 (file)
--- a/arch/csky/mm/ioremap.c
+++ b/arch/csky/mm/ioremap.c
@@ -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);