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Message-ID: <20101203062146.GA1114@linux-sh.org>
Date: Fri, 3 Dec 2010 15:21:46 +0900
From: Paul Mundt <lethal@...ux-sh.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Mikael Starvik <starvik@...s.com>,
Jesper Nilsson <jesper.nilsson@...s.com>,
Chris Metcalf <cmetcalf@...era.com>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] mm: make ioremap_prot() take a pgprot.
On Thu, Dec 02, 2010 at 03:19:01PM -0800, Andrew Morton wrote:
> On Wed, 3 Nov 2010 05:31:03 +0900
> Paul Mundt <lethal@...ux-sh.org> wrote:
>
> > The current definition of ioremap_prot() takes an unsigned long for the
> > page flags and then converts to/from a pgprot as necessary. This is
> > unfortunately not sufficient for the SH-X2 TLB case which has a 64-bit
> > pgprot and a 32-bit unsigned long.
> >
> > An inspection of the tree shows that tile and cris also have their
> > own equivalent routines that are using the pgprot_t but do not set
> > HAVE_IOREMAP_PROT, both of which could trivially be adapted.
> >
> > After cris/tile are updated there would also be enough critical mass to
> > move the powerpc devm_ioremap_prot() in to the generic lib/devres.c.
>
> In file included from sound/drivers/mpu401/mpu401_uart.c:31:
> arch/x86/include/asm/io.h:199: error: syntax error before 'pgprot_t'
> arch/x86/include/asm/io.h:199: warning: function declaration isn't a prototype
>
> because asm/io.h now needs asm/pgtable.h for pgprot_t.
>
Both sh and powerpc have pgprot_t in asm/page.h, it seems to only be x86
that is special. Adding asm/pgtable_types.h for x86 seems to work ok,
though.
Here's a rediffed version:
---
arch/powerpc/include/asm/io.h | 8 +++++---
arch/powerpc/lib/devres.c | 10 +++++-----
arch/sh/Kconfig | 2 +-
arch/sh/boards/mach-landisk/setup.c | 2 +-
arch/sh/boards/mach-lboxre2/setup.c | 2 +-
arch/sh/boards/mach-sh03/setup.c | 2 +-
arch/sh/include/asm/io.h | 4 ++--
arch/x86/include/asm/io.h | 4 ++--
arch/x86/mm/ioremap.c | 5 +++--
arch/x86/mm/pat.c | 5 ++---
include/linux/mm.h | 2 +-
mm/memory.c | 6 +++---
12 files changed, 27 insertions(+), 25 deletions(-)
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
index 001f2f1..27f40e6 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -618,7 +618,8 @@ static inline void iosync(void)
*
* * ioremap_flags allows to specify the page flags as an argument and can
* also be hooked by the platform via ppc_md. ioremap_prot is the exact
- * same thing as ioremap_flags.
+ * same thing as ioremap_flags, with the exception that it takes a
+ * pgprot value instead.
*
* * ioremap_nocache is identical to ioremap
*
@@ -643,7 +644,8 @@ extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
extern void __iomem *ioremap_flags(phys_addr_t address, unsigned long size,
unsigned long flags);
#define ioremap_nocache(addr, size) ioremap((addr), (size))
-#define ioremap_prot(addr, size, prot) ioremap_flags((addr), (size), (prot))
+#define ioremap_prot(addr, size, prot) ioremap_flags((addr), (size), \
+ pgprot_val(prot))
extern void iounmap(volatile void __iomem *addr);
@@ -779,7 +781,7 @@ static inline void * bus_to_virt(unsigned long address)
#define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
void __iomem *devm_ioremap_prot(struct device *dev, resource_size_t offset,
- size_t size, unsigned long flags);
+ size_t size, pgprot_t prot);
#endif /* __KERNEL__ */
diff --git a/arch/powerpc/lib/devres.c b/arch/powerpc/lib/devres.c
index deac4d3..045f7a7 100644
--- a/arch/powerpc/lib/devres.c
+++ b/arch/powerpc/lib/devres.c
@@ -9,21 +9,21 @@
#include <linux/device.h> /* devres_*(), devm_ioremap_release() */
#include <linux/gfp.h>
-#include <linux/io.h> /* ioremap_flags() */
+#include <linux/io.h> /* ioremap_prot() */
#include <linux/module.h> /* EXPORT_SYMBOL() */
/**
- * devm_ioremap_prot - Managed ioremap_flags()
+ * devm_ioremap_prot - Managed ioremap_prot()
* @dev: Generic device to remap IO address for
* @offset: BUS offset to map
* @size: Size of map
- * @flags: Page flags
+ * @prot: Page protection flags
*
* Managed ioremap_prot(). Map is automatically unmapped on driver
* detach.
*/
void __iomem *devm_ioremap_prot(struct device *dev, resource_size_t offset,
- size_t size, unsigned long flags)
+ size_t size, pgprot_t prot)
{
void __iomem **ptr, *addr;
@@ -31,7 +31,7 @@ void __iomem *devm_ioremap_prot(struct device *dev, resource_size_t offset,
if (!ptr)
return NULL;
- addr = ioremap_flags(offset, size, flags);
+ addr = ioremap_prot(offset, size, prot);
if (addr) {
*ptr = addr;
devres_add(dev, ptr);
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 7f217b3..75d03d5 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -33,7 +33,7 @@ config SUPERH32
def_bool ARCH = "sh"
select HAVE_KPROBES
select HAVE_KRETPROBES
- select HAVE_IOREMAP_PROT if MMU && !X2TLB
+ select HAVE_IOREMAP_PROT if MMU
select HAVE_FUNCTION_TRACER
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_DYNAMIC_FTRACE
diff --git a/arch/sh/boards/mach-landisk/setup.c b/arch/sh/boards/mach-landisk/setup.c
index 50337ac..94ab2bb 100644
--- a/arch/sh/boards/mach-landisk/setup.c
+++ b/arch/sh/boards/mach-landisk/setup.c
@@ -63,7 +63,7 @@ static int __init landisk_devices_setup(void)
/* open I/O area window */
paddrbase = virt_to_phys((void *)PA_AREA5_IO);
prot = PAGE_KERNEL_PCC(1, _PAGE_PCC_IO16);
- cf_ide_base = ioremap_prot(paddrbase, PAGE_SIZE, pgprot_val(prot));
+ cf_ide_base = ioremap_prot(paddrbase, PAGE_SIZE, prot);
if (!cf_ide_base) {
printk("allocate_cf_area : can't open CF I/O window!\n");
return -ENOMEM;
diff --git a/arch/sh/boards/mach-lboxre2/setup.c b/arch/sh/boards/mach-lboxre2/setup.c
index 79b4e0d..30e0eeb 100644
--- a/arch/sh/boards/mach-lboxre2/setup.c
+++ b/arch/sh/boards/mach-lboxre2/setup.c
@@ -57,7 +57,7 @@ static int __init lboxre2_devices_setup(void)
paddrbase = virt_to_phys((void*)PA_AREA5_IO);
psize = PAGE_SIZE;
prot = PAGE_KERNEL_PCC(1, _PAGE_PCC_IO16);
- cf0_io_base = (u32)ioremap_prot(paddrbase, psize, pgprot_val(prot));
+ cf0_io_base = (u32)ioremap_prot(paddrbase, psize, prot);
if (!cf0_io_base) {
printk(KERN_ERR "%s : can't open CF I/O window!\n" , __func__ );
return -ENOMEM;
diff --git a/arch/sh/boards/mach-sh03/setup.c b/arch/sh/boards/mach-sh03/setup.c
index af4a0c0..abfb782 100644
--- a/arch/sh/boards/mach-sh03/setup.c
+++ b/arch/sh/boards/mach-sh03/setup.c
@@ -82,7 +82,7 @@ static int __init sh03_devices_setup(void)
/* open I/O area window */
paddrbase = virt_to_phys((void *)PA_AREA5_IO);
prot = PAGE_KERNEL_PCC(1, _PAGE_PCC_IO16);
- cf_ide_base = ioremap_prot(paddrbase, PAGE_SIZE, pgprot_val(prot));
+ cf_ide_base = ioremap_prot(paddrbase, PAGE_SIZE, prot);
if (!cf_ide_base) {
printk("allocate_cf_area : can't open CF I/O window!\n");
return -ENOMEM;
diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index b237d52..7c19d03 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -370,9 +370,9 @@ ioremap_cache(phys_addr_t offset, unsigned long size)
#ifdef CONFIG_HAVE_IOREMAP_PROT
static inline void __iomem *
-ioremap_prot(phys_addr_t offset, unsigned long size, unsigned long flags)
+ioremap_prot(phys_addr_t offset, unsigned long size, pgprot_t prot)
{
- return __ioremap_mode(offset, size, __pgprot(flags));
+ return __ioremap_mode(offset, size, prot);
}
#endif
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 0722730..09895b2 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -40,7 +40,7 @@
#include <linux/compiler.h>
#include <asm-generic/int-ll64.h>
#include <asm/page.h>
-
+#include <asm/pgtable_types.h>
#include <xen/xen.h>
#define build_mmio_read(name, size, type, reg, barrier) \
@@ -196,7 +196,7 @@ static inline unsigned int isa_virt_to_bus(volatile void *address)
extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size,
- unsigned long prot_val);
+ pgprot_t prot);
/*
* The default ioremap() behavior is non-cached:
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 0369843..7e028ac 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -243,9 +243,10 @@ void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size)
EXPORT_SYMBOL(ioremap_cache);
void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size,
- unsigned long prot_val)
+ pgprot_t prot)
{
- return __ioremap_caller(phys_addr, size, (prot_val & _PAGE_CACHE_MASK),
+ return __ioremap_caller(phys_addr, size,
+ (pgprot_val(prot) & _PAGE_CACHE_MASK),
__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_prot);
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index f6ff57b..56e8041 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -661,7 +661,6 @@ static void free_pfn_range(u64 paddr, unsigned long size)
int track_pfn_vma_copy(struct vm_area_struct *vma)
{
resource_size_t paddr;
- unsigned long prot;
unsigned long vma_size = vma->vm_end - vma->vm_start;
pgprot_t pgprot;
@@ -670,11 +669,11 @@ int track_pfn_vma_copy(struct vm_area_struct *vma)
* reserve the whole chunk covered by vma. We need the
* starting address and protection from pte.
*/
- if (follow_phys(vma, vma->vm_start, 0, &prot, &paddr)) {
+ if (follow_phys(vma, vma->vm_start, 0, &pgprot, &paddr)) {
WARN_ON_ONCE(1);
return -EINVAL;
}
- pgprot = __pgprot(prot);
+
return reserve_pfn_range(paddr, vma_size, &pgprot, 1);
}
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 721f451..0f7d3a1 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -818,7 +818,7 @@ void unmap_mapping_range(struct address_space *mapping,
int follow_pfn(struct vm_area_struct *vma, unsigned long address,
unsigned long *pfn);
int follow_phys(struct vm_area_struct *vma, unsigned long address,
- unsigned int flags, unsigned long *prot, resource_size_t *phys);
+ unsigned int flags, pgprot_t *prot, resource_size_t *phys);
int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
void *buf, int len, int write);
diff --git a/mm/memory.c b/mm/memory.c
index 02e48aa..598eee3 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3431,7 +3431,7 @@ EXPORT_SYMBOL(follow_pfn);
#ifdef CONFIG_HAVE_IOREMAP_PROT
int follow_phys(struct vm_area_struct *vma,
unsigned long address, unsigned int flags,
- unsigned long *prot, resource_size_t *phys)
+ pgprot_t *prot, resource_size_t *phys)
{
int ret = -EINVAL;
pte_t *ptep, pte;
@@ -3447,7 +3447,7 @@ int follow_phys(struct vm_area_struct *vma,
if ((flags & FOLL_WRITE) && !pte_write(pte))
goto unlock;
- *prot = pgprot_val(pte_pgprot(pte));
+ *prot = pte_pgprot(pte);
*phys = (resource_size_t)pte_pfn(pte) << PAGE_SHIFT;
ret = 0;
@@ -3461,7 +3461,7 @@ int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
void *buf, int len, int write)
{
resource_size_t phys_addr;
- unsigned long prot = 0;
+ pgprot_t prot;
void __iomem *maddr;
int offset = addr & (PAGE_SIZE-1);
--
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