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authorJames Bottomley <James.Bottomley@HansenPartnership.com>2011-01-20 12:54:18 -0600
committerJames Bottomley <James.Bottomley@suse.de>2011-02-09 11:22:21 -0600
commit8e1964a98920100f113ad26f78220ea706dbfa2b (patch)
treeeff1ff22212732ee39eab6919123886aea3fa1d4
parent100b33c8bd8a3235fd0b7948338d6cbb3db3c63d (diff)
downloadlinux-8e1964a98920100f113ad26f78220ea706dbfa2b.tar.bz2
[PARISC] fix vmap flush/invalidate
On parisc, we never implemented invalidate_kernel_vmap_range() because it was unnecessary for the xfs use case. However, we do need to implement an invalidate for the opposite use case (which occurred in a recent NFS change) where the user wants to read through the vmap range and write via the kernel address. There's an additional complexity to this in that if the page has no userspace mappings, it might have dirty cache lines in the kernel (indicated by the PG_dcache_dirty bit). In order to get full coherency, we need to flush these pages through the kernel mapping before invalidating the vmap range. Signed-off-by: James Bottomley <James.Bottomley@suse.de>
-rw-r--r--arch/parisc/include/asm/cacheflush.h24
1 files changed, 17 insertions, 7 deletions
diff --git a/arch/parisc/include/asm/cacheflush.h b/arch/parisc/include/asm/cacheflush.h
index f388a85bba11..7344e1d304af 100644
--- a/arch/parisc/include/asm/cacheflush.h
+++ b/arch/parisc/include/asm/cacheflush.h
@@ -37,6 +37,13 @@ void flush_cache_all_local(void);
void flush_cache_all(void);
void flush_cache_mm(struct mm_struct *mm);
+#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
+void flush_kernel_dcache_page_addr(void *addr);
+static inline void flush_kernel_dcache_page(struct page *page)
+{
+ flush_kernel_dcache_page_addr(page_address(page));
+}
+
#define flush_kernel_dcache_range(start,size) \
flush_kernel_dcache_range_asm((start), (start)+(size));
/* vmap range flushes and invalidates. Architecturally, we don't need
@@ -50,6 +57,16 @@ static inline void flush_kernel_vmap_range(void *vaddr, int size)
}
static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
{
+ unsigned long start = (unsigned long)vaddr;
+ void *cursor = vaddr;
+
+ for ( ; cursor < vaddr + size; cursor += PAGE_SIZE) {
+ struct page *page = vmalloc_to_page(cursor);
+
+ if (test_and_clear_bit(PG_dcache_dirty, &page->flags))
+ flush_kernel_dcache_page(page);
+ }
+ flush_kernel_dcache_range_asm(start, start + size);
}
#define flush_cache_vmap(start, end) flush_cache_all()
@@ -98,13 +115,6 @@ flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vma
flush_user_dcache_page(vmaddr);
}
-#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
-void flush_kernel_dcache_page_addr(void *addr);
-static inline void flush_kernel_dcache_page(struct page *page)
-{
- flush_kernel_dcache_page_addr(page_address(page));
-}
-
#ifdef CONFIG_DEBUG_RODATA
void mark_rodata_ro(void);
#endif