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Date: Tue, 09 Nov 2010 01:18:19 +1100
From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
To: Paul Mundt <lethal@...ux-sh.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.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>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: make ioremap_prot() take a pgprot.
On Mon, 2010-11-08 at 15:34 +0900, Paul Mundt wrote:
> On Wed, Nov 03, 2010 at 05:31:03AM +0900, Paul Mundt 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.
> >
> > Signed-off-by: Paul Mundt <lethal@...ux-sh.org>
> >
> Any takers?
Haven't had a chance to play with it yet, still travelling.
Cheers,
Ben.
> > ---
> >
> > 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 | 2 +-
> > arch/x86/mm/ioremap.c | 5 +++--
> > arch/x86/mm/pat.c | 5 ++---
> > include/linux/mm.h | 2 +-
> > mm/memory.c | 6 +++---
> > 12 files changed, 26 insertions(+), 24 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 435e7f8..71ce972 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 89ab2c5..e3f47f3 100644
> > --- a/arch/sh/include/asm/io.h
> > +++ b/arch/sh/include/asm/io.h
> > @@ -389,9 +389,9 @@ 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..e61c439 100644
> > --- a/arch/x86/include/asm/io.h
> > +++ b/arch/x86/include/asm/io.h
> > @@ -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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