diff options
Diffstat (limited to 'arch/x86/mm/ioremap.c')
| -rw-r--r-- | arch/x86/mm/ioremap.c | 35 |
1 files changed, 28 insertions, 7 deletions
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 2ac09a5822c..20c01f2b2e1 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -19,6 +19,7 @@ #include <asm/pgtable.h> #include <asm/tlbflush.h> #include <asm/pgalloc.h> +#include <asm/pat.h> #ifdef CONFIG_X86_64 @@ -118,6 +119,7 @@ static void __iomem *__ioremap(resource_size_t phys_addr, unsigned long size, { unsigned long pfn, offset, last_addr, vaddr; struct vm_struct *area; + unsigned long new_prot_val; pgprot_t prot; /* Don't allow wraparound or zero size */ @@ -151,6 +153,28 @@ static void __iomem *__ioremap(resource_size_t phys_addr, unsigned long size, WARN_ON_ONCE(is_ram); } + /* + * Mappings have to be page-aligned + */ + offset = phys_addr & ~PAGE_MASK; + phys_addr &= PAGE_MASK; + size = PAGE_ALIGN(last_addr+1) - phys_addr; + + if (reserve_memtype(phys_addr, phys_addr + size, + prot_val, &new_prot_val)) { + /* + * Do not fallback to certain memory types with certain + * requested type: + * - request is uncached, return cannot be write-back + */ + if ((prot_val == _PAGE_CACHE_UC && + new_prot_val == _PAGE_CACHE_WB)) { + free_memtype(phys_addr, phys_addr + size); + return NULL; + } + prot_val = new_prot_val; + } + switch (prot_val) { case _PAGE_CACHE_UC: default: @@ -162,13 +186,6 @@ static void __iomem *__ioremap(resource_size_t phys_addr, unsigned long size, } /* - * Mappings have to be page-aligned - */ - offset = phys_addr & ~PAGE_MASK; - phys_addr &= PAGE_MASK; - size = PAGE_ALIGN(last_addr+1) - phys_addr; - - /* * Ok, go for it.. */ area = get_vm_area(size, VM_IOREMAP); @@ -177,11 +194,13 @@ static void __iomem *__ioremap(resource_size_t phys_addr, unsigned long size, area->phys_addr = phys_addr; vaddr = (unsigned long) area->addr; if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) { + free_memtype(phys_addr, phys_addr + size); free_vm_area(area); return NULL; } if (ioremap_change_attr(vaddr, size, prot_val) < 0) { + free_memtype(phys_addr, phys_addr + size); vunmap(area->addr); return NULL; } @@ -265,6 +284,8 @@ void iounmap(volatile void __iomem *addr) return; } + free_memtype(p->phys_addr, p->phys_addr + get_vm_area_size(p)); + /* Finally remove it */ o = remove_vm_area((void *)addr); BUG_ON(p != o || o == NULL); |