diff options
| -rw-r--r-- | arch/x86/mm/pat.c | 47 | ||||
| -rw-r--r-- | include/asm-generic/pgtable.h | 55 | ||||
| -rw-r--r-- | mm/memory.c | 13 |
3 files changed, 73 insertions, 42 deletions
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index de36c886cd3..74a702674e8 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -664,13 +664,13 @@ static void free_pfn_range(u64 paddr, unsigned long size) } /* - * track_pfn_vma_copy is called when vma that is covering the pfnmap gets + * track_pfn_copy is called when vma that is covering the pfnmap gets * copied through copy_page_range(). * * If the vma has a linear pfn mapping for the entire range, we get the prot * from pte and reserve the entire vma range with single reserve_pfn_range call. */ -int track_pfn_vma_copy(struct vm_area_struct *vma) +int track_pfn_copy(struct vm_area_struct *vma) { resource_size_t paddr; unsigned long prot; @@ -694,15 +694,12 @@ int track_pfn_vma_copy(struct vm_area_struct *vma) } /* - * track_pfn_vma_new is called when a _new_ pfn mapping is being established - * for physical range indicated by pfn and size. - * * prot is passed in as a parameter for the new mapping. If the vma has a * linear pfn mapping for the entire range reserve the entire vma range with * single reserve_pfn_range call. */ -int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot, - unsigned long pfn, unsigned long size) +int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, + unsigned long pfn, unsigned long size) { resource_size_t paddr = (resource_size_t)pfn << PAGE_SHIFT; unsigned long flags; @@ -714,8 +711,36 @@ int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot, if (!pat_enabled) return 0; - /* for vm_insert_pfn and friends, we set prot based on lookup */ + /* + * For anything smaller than the vma size we set prot based on the + * lookup. + */ flags = lookup_memtype(paddr); + + /* Check memtype for the remaining pages */ + while (size > PAGE_SIZE) { + size -= PAGE_SIZE; + paddr += PAGE_SIZE; + if (flags != lookup_memtype(paddr)) + return -EINVAL; + } + + *prot = __pgprot((pgprot_val(vma->vm_page_prot) & (~_PAGE_CACHE_MASK)) | + flags); + + return 0; +} + +int track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, + unsigned long pfn) +{ + unsigned long flags; + + if (!pat_enabled) + return 0; + + /* Set prot based on lookup */ + flags = lookup_memtype((resource_size_t)pfn << PAGE_SHIFT); *prot = __pgprot((pgprot_val(vma->vm_page_prot) & (~_PAGE_CACHE_MASK)) | flags); @@ -723,12 +748,12 @@ int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot, } /* - * untrack_pfn_vma is called while unmapping a pfnmap for a region. + * untrack_pfn is called while unmapping a pfnmap for a region. * untrack can be called for a specific region indicated by pfn and size or * can be for the entire vma (in which case pfn, size are zero). */ -void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn, - unsigned long size) +void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn, + unsigned long size) { resource_size_t paddr; unsigned long prot; diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index ff4947b7a97..d4d4592c97f 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -381,48 +381,57 @@ static inline void ptep_modify_prot_commit(struct mm_struct *mm, #ifndef __HAVE_PFNMAP_TRACKING /* - * Interface that can be used by architecture code to keep track of - * memory type of pfn mappings (remap_pfn_range, vm_insert_pfn) - * - * track_pfn_vma_new is called when a _new_ pfn mapping is being established - * for physical range indicated by pfn and size. + * Interfaces that can be used by architecture code to keep track of + * memory type of pfn mappings specified by the remap_pfn_range, + * vm_insert_pfn. + */ + +/* + * track_pfn_remap is called when a _new_ pfn mapping is being established + * by remap_pfn_range() for physical range indicated by pfn and size. */ -static inline int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot, - unsigned long pfn, unsigned long size) +static inline int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, + unsigned long pfn, unsigned long size) { return 0; } /* - * Interface that can be used by architecture code to keep track of - * memory type of pfn mappings (remap_pfn_range, vm_insert_pfn) - * - * track_pfn_vma_copy is called when vma that is covering the pfnmap gets + * track_pfn_insert is called when a _new_ single pfn is established + * by vm_insert_pfn(). + */ +static inline int track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, + unsigned long pfn) +{ + return 0; +} + +/* + * track_pfn_copy is called when vma that is covering the pfnmap gets * copied through copy_page_range(). */ -static inline int track_pfn_vma_copy(struct vm_area_struct *vma) +static inline int track_pfn_copy(struct vm_area_struct *vma) { return 0; } /* - * Interface that can be used by architecture code to keep track of - * memory type of pfn mappings (remap_pfn_range, vm_insert_pfn) - * * untrack_pfn_vma is called while unmapping a pfnmap for a region. * untrack can be called for a specific region indicated by pfn and size or - * can be for the entire vma (in which case size can be zero). + * can be for the entire vma (in which case pfn, size are zero). */ -static inline void untrack_pfn_vma(struct vm_area_struct *vma, - unsigned long pfn, unsigned long size) +static inline void untrack_pfn(struct vm_area_struct *vma, + unsigned long pfn, unsigned long size) { } #else -extern int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot, - unsigned long pfn, unsigned long size); -extern int track_pfn_vma_copy(struct vm_area_struct *vma); -extern void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn, - unsigned long size); +extern int track_pfn_remap(struct vm_area_struct *vma, pgprot_t *prot, + unsigned long pfn, unsigned long size); +extern int track_pfn_insert(struct vm_area_struct *vma, pgprot_t *prot, + unsigned long pfn); +extern int track_pfn_copy(struct vm_area_struct *vma); +extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn, + unsigned long size); #endif #ifdef CONFIG_MMU diff --git a/mm/memory.c b/mm/memory.c index 57361708d1a..6bef278ad30 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1060,7 +1060,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm, * We do not free on error cases below as remove_vma * gets called on error from higher level routine */ - ret = track_pfn_vma_copy(vma); + ret = track_pfn_copy(vma); if (ret) return ret; } @@ -1328,7 +1328,7 @@ static void unmap_single_vma(struct mmu_gather *tlb, uprobe_munmap(vma, start, end); if (unlikely(is_pfn_mapping(vma))) - untrack_pfn_vma(vma, 0, 0); + untrack_pfn(vma, 0, 0); if (start != end) { if (unlikely(is_vm_hugetlb_page(vma))) { @@ -2162,14 +2162,11 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, if (addr < vma->vm_start || addr >= vma->vm_end) return -EFAULT; - if (track_pfn_vma_new(vma, &pgprot, pfn, PAGE_SIZE)) + if (track_pfn_insert(vma, &pgprot, pfn)) return -EINVAL; ret = insert_pfn(vma, addr, pfn, pgprot); - if (ret) - untrack_pfn_vma(vma, pfn, PAGE_SIZE); - return ret; } EXPORT_SYMBOL(vm_insert_pfn); @@ -2311,7 +2308,7 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP; - err = track_pfn_vma_new(vma, &prot, pfn, PAGE_ALIGN(size)); + err = track_pfn_remap(vma, &prot, pfn, PAGE_ALIGN(size)); if (err) { /* * To indicate that track_pfn related cleanup is not @@ -2335,7 +2332,7 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, } while (pgd++, addr = next, addr != end); if (err) - untrack_pfn_vma(vma, pfn, PAGE_ALIGN(size)); + untrack_pfn(vma, pfn, PAGE_ALIGN(size)); return err; } |