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uio: introduce UIO_MEM_IOVA

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Introduce the concept of mapping physical memory locations that
are normal memory. The new type UIO_MEM_IOVA are similar to
existing UIO_MEM_PHYS but the backing memory is not marked as uncached.

Also, indent related switch to the currently used style.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Hemminger
2018-09-14 09:10:18 -07:00
committed by Greg Kroah-Hartman
parent ae6935ed7d
commit bfddabfa23
2 changed files with 14 additions and 11 deletions
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4
drivers/uio/uio.c
View File

@@ -738,6 +738,7 @@ static int uio_mmap_physical(struct vm_area_struct *vma)
return -EINVAL; return -EINVAL;
vma->vm_ops = &uio_physical_vm_ops; vma->vm_ops = &uio_physical_vm_ops;
if (idev->info->mem[mi].memtype == UIO_MEM_PHYS)
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
/* /*
@@ -795,6 +796,7 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
} }
switch (idev->info->mem[mi].memtype) { switch (idev->info->mem[mi].memtype) {
case UIO_MEM_IOVA:
case UIO_MEM_PHYS: case UIO_MEM_PHYS:
ret = uio_mmap_physical(vma); ret = uio_mmap_physical(vma);
break; break;
@@ -806,7 +808,7 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
ret = -EINVAL; ret = -EINVAL;
} }
out: out:
mutex_unlock(&idev->info_lock); mutex_unlock(&idev->info_lock);
return ret; return ret;
} }

1
include/linux/uio_driver.h
View File

@@ -133,6 +133,7 @@ extern void uio_event_notify(struct uio_info *info);
#define UIO_MEM_PHYS 1 #define UIO_MEM_PHYS 1
#define UIO_MEM_LOGICAL 2 #define UIO_MEM_LOGICAL 2
#define UIO_MEM_VIRTUAL 3 #define UIO_MEM_VIRTUAL 3
#define UIO_MEM_IOVA 4
/* defines for uio_port->porttype */ /* defines for uio_port->porttype */
#define UIO_PORT_NONE 0 #define UIO_PORT_NONE 0