| Message ID | 20191029064834.23438-18-hch@lst.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [01/21] arm: remove ioremap_cached | expand |
On Mon, 28 Oct 2019 23:48:30 PDT (-0700), Christoph Hellwig wrote: > A lot of architectures reuse the same simple ioremap implementation, so > start lifting the most simple variant to lib/ioremap.c. It provides > ioremap_prot and iounmap, plus a default ioremap that uses prot_noncached, > although that can be overridden by asm/io.h. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > include/asm-generic/io.h | 20 ++++++++++++++++---- > lib/Kconfig | 3 +++ > lib/ioremap.c | 39 +++++++++++++++++++++++++++++++++++++++ > 3 files changed, 58 insertions(+), 4 deletions(-) > > diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h > index 4e45e1cb6560..4a661fdd1937 100644 > --- a/include/asm-generic/io.h > +++ b/include/asm-generic/io.h > @@ -923,9 +923,10 @@ static inline void *phys_to_virt(unsigned long address) > * DOC: ioremap() and ioremap_*() variants > * > * Architectures with an MMU are expected to provide ioremap() and iounmap() > - * themselves. For NOMMU architectures we provide a default nop-op > - * implementation that expect that the physical address used for MMIO are > - * already marked as uncached, and can be used as kernel virtual addresses. > + * themselves or rely on GENERIC_IOREMAP. For NOMMU architectures we provide > + * a default nop-op implementation that expect that the physical address used > + * for MMIO are already marked as uncached, and can be used as kernel virtual > + * addresses. > * > * ioremap_wc() and ioremap_wt() can provide more relaxed caching attributes > * for specific drivers if the architecture choses to implement them. If they > @@ -946,7 +947,18 @@ static inline void iounmap(void __iomem *addr) > { > } > #endif > -#endif /* CONFIG_MMU */ > +#elif defined(CONFIG_GENERIC_IOREMAP) > +#include <asm/pgtable.h> > + > +void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot); > +void iounmap(volatile void __iomem *addr); > + > +static inline void __iomem *ioremap(phys_addr_t addr, size_t size) > +{ > + /* _PAGE_IOREMAP needs to be supplied by the architecture */ > + return ioremap_prot(addr, size, _PAGE_IOREMAP); > +} > +#endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */ > > #ifndef ioremap_nocache > #define ioremap_nocache ioremap > diff --git a/lib/Kconfig b/lib/Kconfig > index 183f92a297ca..afc78aaf2b25 100644 > --- a/lib/Kconfig > +++ b/lib/Kconfig > @@ -638,6 +638,9 @@ config STRING_SELFTEST > > endmenu > > +config GENERIC_IOREMAP > + bool > + > config GENERIC_LIB_ASHLDI3 > bool > > diff --git a/lib/ioremap.c b/lib/ioremap.c > index 0a2ffadc6d71..3f0e18543de8 100644 > --- a/lib/ioremap.c > +++ b/lib/ioremap.c > @@ -231,3 +231,42 @@ int ioremap_page_range(unsigned long addr, > > return err; > } > + > +#ifdef CONFIG_GENERIC_IOREMAP > +void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot) > +{ > + unsigned long offset, vaddr; > + phys_addr_t last_addr; > + struct vm_struct *area; > + > + /* Disallow wrap-around or zero size */ > + last_addr = addr + size - 1; > + if (!size || last_addr < addr) > + return NULL; > + > + /* Page-align mappings */ > + offset = addr & (~PAGE_MASK); > + addr -= offset; > + size = PAGE_ALIGN(size + offset); > + > + area = get_vm_area_caller(size, VM_IOREMAP, > + __builtin_return_address(0)); > + if (!area) > + return NULL; > + vaddr = (unsigned long)area->addr; > + > + if (ioremap_page_range(vaddr, vaddr + size, addr, __pgprot(prot))) { > + free_vm_area(area); > + return NULL; > + } > + > + return (void __iomem *)(vaddr + offset); > +} > +EXPORT_SYMBOL(ioremap_prot); > + > +void iounmap(volatile void __iomem *addr) > +{ > + vunmap((void *)((unsigned long)addr & PAGE_MASK)); > +} > +EXPORT_SYMBOL(iounmap); > +#endif /* CONFIG_GENERIC_IOREMAP */ Reviewed-by: Palmer Dabbelt <palmer@dabbelt.com> Thanks! This should let us get rid of arch/riscv/mm/ioremap.c.
On Tue, Oct 29, 2019 at 7:49 AM Christoph Hellwig <hch@lst.de> wrote: > > A lot of architectures reuse the same simple ioremap implementation, so > start lifting the most simple variant to lib/ioremap.c. It provides > ioremap_prot and iounmap, plus a default ioremap that uses prot_noncached, > although that can be overridden by asm/io.h. > > Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index 4e45e1cb6560..4a661fdd1937 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -923,9 +923,10 @@ static inline void *phys_to_virt(unsigned long address) * DOC: ioremap() and ioremap_*() variants * * Architectures with an MMU are expected to provide ioremap() and iounmap() - * themselves. For NOMMU architectures we provide a default nop-op - * implementation that expect that the physical address used for MMIO are - * already marked as uncached, and can be used as kernel virtual addresses. + * themselves or rely on GENERIC_IOREMAP. For NOMMU architectures we provide + * a default nop-op implementation that expect that the physical address used + * for MMIO are already marked as uncached, and can be used as kernel virtual + * addresses. * * ioremap_wc() and ioremap_wt() can provide more relaxed caching attributes * for specific drivers if the architecture choses to implement them. If they @@ -946,7 +947,18 @@ static inline void iounmap(void __iomem *addr) { } #endif -#endif /* CONFIG_MMU */ +#elif defined(CONFIG_GENERIC_IOREMAP) +#include <asm/pgtable.h> + +void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot); +void iounmap(volatile void __iomem *addr); + +static inline void __iomem *ioremap(phys_addr_t addr, size_t size) +{ + /* _PAGE_IOREMAP needs to be supplied by the architecture */ + return ioremap_prot(addr, size, _PAGE_IOREMAP); +} +#endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */ #ifndef ioremap_nocache #define ioremap_nocache ioremap diff --git a/lib/Kconfig b/lib/Kconfig index 183f92a297ca..afc78aaf2b25 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -638,6 +638,9 @@ config STRING_SELFTEST endmenu +config GENERIC_IOREMAP + bool + config GENERIC_LIB_ASHLDI3 bool diff --git a/lib/ioremap.c b/lib/ioremap.c index 0a2ffadc6d71..3f0e18543de8 100644 --- a/lib/ioremap.c +++ b/lib/ioremap.c @@ -231,3 +231,42 @@ int ioremap_page_range(unsigned long addr, return err; } + +#ifdef CONFIG_GENERIC_IOREMAP +void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot) +{ + unsigned long offset, vaddr; + phys_addr_t last_addr; + struct vm_struct *area; + + /* Disallow wrap-around or zero size */ + last_addr = addr + size - 1; + if (!size || last_addr < addr) + return NULL; + + /* Page-align mappings */ + offset = addr & (~PAGE_MASK); + addr -= offset; + size = PAGE_ALIGN(size + offset); + + area = get_vm_area_caller(size, VM_IOREMAP, + __builtin_return_address(0)); + if (!area) + return NULL; + vaddr = (unsigned long)area->addr; + + if (ioremap_page_range(vaddr, vaddr + size, addr, __pgprot(prot))) { + free_vm_area(area); + return NULL; + } + + return (void __iomem *)(vaddr + offset); +} +EXPORT_SYMBOL(ioremap_prot); + +void iounmap(volatile void __iomem *addr) +{ + vunmap((void *)((unsigned long)addr & PAGE_MASK)); +} +EXPORT_SYMBOL(iounmap); +#endif /* CONFIG_GENERIC_IOREMAP */
A lot of architectures reuse the same simple ioremap implementation, so start lifting the most simple variant to lib/ioremap.c. It provides ioremap_prot and iounmap, plus a default ioremap that uses prot_noncached, although that can be overridden by asm/io.h. Signed-off-by: Christoph Hellwig <hch@lst.de> --- include/asm-generic/io.h | 20 ++++++++++++++++---- lib/Kconfig | 3 +++ lib/ioremap.c | 39 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 58 insertions(+), 4 deletions(-)