[PATCH v2 02/11] mm: ioremap: fixup the physical address and page prot

Baoquan He
2022-08-20T00:33:38Z

On some architectures, the physical address need be fixed up before
doing mapping, e.g, parisc. And on architectures, e.g arc, the
parameter 'prot' passed into ioremap_prot() need be adjusted too.

In oder to convert them to take GENERIC_IOREMAP method, we need wrap
the address fixing up code and page prot adjusting code into arch_ioremap()
and pass the new address and 'prot' out for ioremap_prot() handling.

This is a preparation patch, no functionality change.

Signed-off-by: Baoquan He <bhe@redhat.com>
---
arch/arm64/include/asm/io.h | 3 ++-
arch/arm64/mm/ioremap.c | 5 +++--
include/asm-generic/io.h | 4 ++--
mm/ioremap.c | 2 +-
4 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index dd7e1c2dc86c..6a5578ddbbf6 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -139,7 +139,8 @@ extern void __memset_io(volatile void __iomem *, int, size_t);
* I/O memory mapping functions.
*/

-void __iomem *arch_ioremap(phys_addr_t phys_addr, size_t size, unsigned long prot);
+void __iomem *
+arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long *prot_val);
#define arch_ioremap arch_ioremap

#define _PAGE_IOREMAP PROT_DEVICE_nGnRE
diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c
index b0f4cea86f0e..ef75ffef4dbc 100644
--- a/arch/arm64/mm/ioremap.c
+++ b/arch/arm64/mm/ioremap.c
@@ -3,9 +3,10 @@
#include <linux/mm.h>
#include <linux/io.h>

-void __iomem *arch_ioremap(phys_addr_t phys_addr, size_t size, unsigned long prot)
+void __iomem *
+arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long *prot_val)
{
- unsigned long last_addr, offset;
+ unsigned long last_addr, offset, phys_addr = *paddr;

offset = phys_addr & (~PAGE_MASK);
phys_addr -= offset;
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 7b6bfb62ef80..fb9bda2be8ed 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -1059,8 +1059,8 @@ static inline void iounmap(volatile void __iomem *addr)
*/
#ifndef arch_ioremap
#define arch_ioremap arch_ioremap
-static inline void __iomem *arch_ioremap(phys_addr_t phys_addr, size_t size,
- unsigned long prot)
+static inline void __iomem *arch_ioremap(phys_addr_t *paddr, size_t size,
+ unsigned long *prot_val)
{
return NULL;
}
diff --git a/mm/ioremap.c b/mm/ioremap.c
index 99fde69becc7..7914b5cf5b78 100644
--- a/mm/ioremap.c
+++ b/mm/ioremap.c
@@ -19,7 +19,7 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
struct vm_struct *area;
void __iomem *ioaddr;

- ioaddr = arch_ioremap(phys_addr, size, prot);
+ ioaddr = arch_ioremap(&phys_addr, size, &prot);
if (IS_ERR(ioaddr))
return NULL;
else if (ioaddr)
--
2.34.1