mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 14:45:11 +07:00
8480657280
Since vfio_ccw_async_region_ops is not exported and has no reason to be
globally visible make it static to avoid the following sparse warning:
drivers/s390/cio/vfio_ccw_async.c:73:30: warning: symbol 'vfio_ccw_async_region_ops' was not declared. Should it be static?
Fixes: d5afd5d135 ("vfio-ccw: add handling for async channel instructions")
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Async I/O region for vfio_ccw
|
|
*
|
|
* Copyright Red Hat, Inc. 2019
|
|
*
|
|
* Author(s): Cornelia Huck <cohuck@redhat.com>
|
|
*/
|
|
|
|
#include <linux/vfio.h>
|
|
#include <linux/mdev.h>
|
|
|
|
#include "vfio_ccw_private.h"
|
|
|
|
static ssize_t vfio_ccw_async_region_read(struct vfio_ccw_private *private,
|
|
char __user *buf, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
unsigned int i = VFIO_CCW_OFFSET_TO_INDEX(*ppos) - VFIO_CCW_NUM_REGIONS;
|
|
loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;
|
|
struct ccw_cmd_region *region;
|
|
int ret;
|
|
|
|
if (pos + count > sizeof(*region))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&private->io_mutex);
|
|
region = private->region[i].data;
|
|
if (copy_to_user(buf, (void *)region + pos, count))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = count;
|
|
mutex_unlock(&private->io_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t vfio_ccw_async_region_write(struct vfio_ccw_private *private,
|
|
const char __user *buf, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
unsigned int i = VFIO_CCW_OFFSET_TO_INDEX(*ppos) - VFIO_CCW_NUM_REGIONS;
|
|
loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;
|
|
struct ccw_cmd_region *region;
|
|
int ret;
|
|
|
|
if (pos + count > sizeof(*region))
|
|
return -EINVAL;
|
|
|
|
if (!mutex_trylock(&private->io_mutex))
|
|
return -EAGAIN;
|
|
|
|
region = private->region[i].data;
|
|
if (copy_from_user((void *)region + pos, buf, count)) {
|
|
ret = -EFAULT;
|
|
goto out_unlock;
|
|
}
|
|
|
|
vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_ASYNC_REQ);
|
|
|
|
ret = region->ret_code ? region->ret_code : count;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&private->io_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void vfio_ccw_async_region_release(struct vfio_ccw_private *private,
|
|
struct vfio_ccw_region *region)
|
|
{
|
|
|
|
}
|
|
|
|
static const struct vfio_ccw_regops vfio_ccw_async_region_ops = {
|
|
.read = vfio_ccw_async_region_read,
|
|
.write = vfio_ccw_async_region_write,
|
|
.release = vfio_ccw_async_region_release,
|
|
};
|
|
|
|
int vfio_ccw_register_async_dev_regions(struct vfio_ccw_private *private)
|
|
{
|
|
return vfio_ccw_register_dev_region(private,
|
|
VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD,
|
|
&vfio_ccw_async_region_ops,
|
|
sizeof(struct ccw_cmd_region),
|
|
VFIO_REGION_INFO_FLAG_READ |
|
|
VFIO_REGION_INFO_FLAG_WRITE,
|
|
private->cmd_region);
|
|
}
|