151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Channel path related status regions for vfio_ccw
|
|
*
|
|
* Copyright IBM Corp. 2020
|
|
*
|
|
* Author(s): Farhan Ali <alifm@linux.ibm.com>
|
|
* Eric Farman <farman@linux.ibm.com>
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/vfio.h>
|
|
#include "vfio_ccw_private.h"
|
|
|
|
static ssize_t vfio_ccw_schib_region_read(struct vfio_ccw_private *private,
|
|
char __user *buf, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
struct subchannel *sch = to_subchannel(private->vdev.dev->parent);
|
|
unsigned int i = VFIO_CCW_OFFSET_TO_INDEX(*ppos) - VFIO_CCW_NUM_REGIONS;
|
|
loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;
|
|
struct ccw_schib_region *region;
|
|
int ret;
|
|
|
|
if (pos + count > sizeof(*region))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&private->io_mutex);
|
|
region = private->region[i].data;
|
|
|
|
if (cio_update_schib(sch)) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
memcpy(region, &sch->schib, sizeof(*region));
|
|
|
|
if (copy_to_user(buf, (void *)region + pos, count)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
ret = count;
|
|
|
|
out:
|
|
mutex_unlock(&private->io_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t vfio_ccw_schib_region_write(struct vfio_ccw_private *private,
|
|
const char __user *buf, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
static void vfio_ccw_schib_region_release(struct vfio_ccw_private *private,
|
|
struct vfio_ccw_region *region)
|
|
{
|
|
|
|
}
|
|
|
|
static const struct vfio_ccw_regops vfio_ccw_schib_region_ops = {
|
|
.read = vfio_ccw_schib_region_read,
|
|
.write = vfio_ccw_schib_region_write,
|
|
.release = vfio_ccw_schib_region_release,
|
|
};
|
|
|
|
int vfio_ccw_register_schib_dev_regions(struct vfio_ccw_private *private)
|
|
{
|
|
return vfio_ccw_register_dev_region(private,
|
|
VFIO_REGION_SUBTYPE_CCW_SCHIB,
|
|
&vfio_ccw_schib_region_ops,
|
|
sizeof(struct ccw_schib_region),
|
|
VFIO_REGION_INFO_FLAG_READ,
|
|
private->schib_region);
|
|
}
|
|
|
|
static ssize_t vfio_ccw_crw_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_crw_region *region;
|
|
struct vfio_ccw_crw *crw;
|
|
int ret;
|
|
|
|
if (pos + count > sizeof(*region))
|
|
return -EINVAL;
|
|
|
|
crw = list_first_entry_or_null(&private->crw,
|
|
struct vfio_ccw_crw, next);
|
|
|
|
if (crw)
|
|
list_del(&crw->next);
|
|
|
|
mutex_lock(&private->io_mutex);
|
|
region = private->region[i].data;
|
|
|
|
if (crw)
|
|
memcpy(®ion->crw, &crw->crw, sizeof(region->crw));
|
|
|
|
if (copy_to_user(buf, (void *)region + pos, count))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = count;
|
|
|
|
region->crw = 0;
|
|
|
|
mutex_unlock(&private->io_mutex);
|
|
|
|
kfree(crw);
|
|
|
|
/* Notify the guest if more CRWs are on our queue */
|
|
if (!list_empty(&private->crw) && private->crw_trigger)
|
|
eventfd_signal(private->crw_trigger, 1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t vfio_ccw_crw_region_write(struct vfio_ccw_private *private,
|
|
const char __user *buf, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void vfio_ccw_crw_region_release(struct vfio_ccw_private *private,
|
|
struct vfio_ccw_region *region)
|
|
{
|
|
|
|
}
|
|
|
|
static const struct vfio_ccw_regops vfio_ccw_crw_region_ops = {
|
|
.read = vfio_ccw_crw_region_read,
|
|
.write = vfio_ccw_crw_region_write,
|
|
.release = vfio_ccw_crw_region_release,
|
|
};
|
|
|
|
int vfio_ccw_register_crw_dev_regions(struct vfio_ccw_private *private)
|
|
{
|
|
return vfio_ccw_register_dev_region(private,
|
|
VFIO_REGION_SUBTYPE_CCW_CRW,
|
|
&vfio_ccw_crw_region_ops,
|
|
sizeof(struct ccw_crw_region),
|
|
VFIO_REGION_INFO_FLAG_READ,
|
|
private->crw_region);
|
|
}
|