access_process_vm device memory infrastructure

[linux-2.6-omap-h63xx.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index eb815cfc1b351e29cd37ba377b5ed9b719dbdff1..5c7f8f64f70eb843c7e5bde877c29a5fb6ba9dca 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -170,6 +170,12 @@ struct vm_operations_struct {
        /* notification that a previously read-only page is about to become
         * writable, if an error is returned it will cause a SIGBUS */
        int (*page_mkwrite)(struct vm_area_struct *vma, struct page *page);
+
+       /* called by access_process_vm when get_user_pages() fails, typically
+        * for use by special VMAs that can switch between memory and hardware
+        */
+       int (*access)(struct vm_area_struct *vma, unsigned long addr,
+                     void *buf, int len, int write);
 #ifdef CONFIG_NUMA
        /*
         * set_policy() op must add a reference to any non-NULL @new mempolicy
@@ -771,6 +777,8 @@ int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
                        struct vm_area_struct *vma);
 void unmap_mapping_range(struct address_space *mapping,
                loff_t const holebegin, loff_t const holelen, int even_cows);
+int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
+                       void *buf, int len, int write);
 
 static inline void unmap_shared_mapping_range(struct address_space *mapping,
                loff_t const holebegin, loff_t const holelen)