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authorDmitry Kalinkin <dmitry.kalinkin@gmail.com>2015-02-26 18:53:10 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-03-06 17:03:22 -0800
commitc74a804f115bdedcac72ea52ca33f46cfae3b74f (patch)
tree0e2c88fa7c1c0ba49147594f70d99688e9345c10 /drivers/vme
parent0cd189a42da07c89c809debc1f6a75f5ec0f5c43 (diff)
downloadop-kernel-dev-c74a804f115bdedcac72ea52ca33f46cfae3b74f.zip
op-kernel-dev-c74a804f115bdedcac72ea52ca33f46cfae3b74f.tar.gz
staging: vme: mmap() support for vme_user
We also make sure that user won't be able to reconfigure the window while it is mmap'ed. Signed-off-by: Dmitry Kalinkin <dmitry.kalinkin@gmail.com> Cc: Martyn Welch <martyn.welch@ge.com> Cc: Igor Alekseev <igor.alekseev@itep.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/vme')
-rw-r--r--drivers/vme/vme.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/vme/vme.c b/drivers/vme/vme.c
index d95fb84..6bab2c4ed 100644
--- a/drivers/vme/vme.c
+++ b/drivers/vme/vme.c
@@ -609,6 +609,32 @@ unsigned int vme_master_rmw(struct vme_resource *resource, unsigned int mask,
}
EXPORT_SYMBOL(vme_master_rmw);
+int vme_master_mmap(struct vme_resource *resource, struct vm_area_struct *vma)
+{
+ struct vme_master_resource *image;
+ phys_addr_t phys_addr;
+ unsigned long vma_size;
+
+ if (resource->type != VME_MASTER) {
+ pr_err("Not a master resource\n");
+ return -EINVAL;
+ }
+
+ image = list_entry(resource->entry, struct vme_master_resource, list);
+ phys_addr = image->bus_resource.start + (vma->vm_pgoff << PAGE_SHIFT);
+ vma_size = vma->vm_end - vma->vm_start;
+
+ if (phys_addr + vma_size > image->bus_resource.end + 1) {
+ pr_err("Map size cannot exceed the window size\n");
+ return -EFAULT;
+ }
+
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+ return vm_iomap_memory(vma, phys_addr, vma->vm_end - vma->vm_start);
+}
+EXPORT_SYMBOL(vme_master_mmap);
+
void vme_master_free(struct vme_resource *resource)
{
struct vme_master_resource *master_image;
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