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3652117f85
Ever since the eventfd type was introduced back in 2007 in commit
e1ad7468c7 ("signal/timer/event: eventfd core") the eventfd_signal()
function only ever passed 1 as a value for @n. There's no point in
keeping that additional argument.
Link: https://lore.kernel.org/r/20231122-vfs-eventfd-signal-v2-2-bd549b14ce0c@kernel.org
Acked-by: Xu Yilun <yilun.xu@intel.com>
Acked-by: Andrew Donnellan <ajd@linux.ibm.com> # ocxl
Acked-by: Eric Farman <farman@linux.ibm.com> # s390
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>
151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Channel path related status regions for vfio_ccw
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*
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* Copyright IBM Corp. 2020
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*
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* Author(s): Farhan Ali <alifm@linux.ibm.com>
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* Eric Farman <farman@linux.ibm.com>
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*/
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#include <linux/slab.h>
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#include <linux/vfio.h>
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#include "vfio_ccw_private.h"
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static ssize_t vfio_ccw_schib_region_read(struct vfio_ccw_private *private,
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char __user *buf, size_t count,
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loff_t *ppos)
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{
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struct subchannel *sch = to_subchannel(private->vdev.dev->parent);
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unsigned int i = VFIO_CCW_OFFSET_TO_INDEX(*ppos) - VFIO_CCW_NUM_REGIONS;
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loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;
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struct ccw_schib_region *region;
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int ret;
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if (pos + count > sizeof(*region))
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return -EINVAL;
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mutex_lock(&private->io_mutex);
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region = private->region[i].data;
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if (cio_update_schib(sch)) {
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ret = -ENODEV;
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goto out;
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}
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memcpy(region, &sch->schib, sizeof(*region));
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if (copy_to_user(buf, (void *)region + pos, count)) {
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ret = -EFAULT;
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goto out;
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}
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ret = count;
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out:
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mutex_unlock(&private->io_mutex);
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return ret;
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}
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static ssize_t vfio_ccw_schib_region_write(struct vfio_ccw_private *private,
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const char __user *buf, size_t count,
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loff_t *ppos)
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{
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return -EINVAL;
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}
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static void vfio_ccw_schib_region_release(struct vfio_ccw_private *private,
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struct vfio_ccw_region *region)
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{
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}
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static const struct vfio_ccw_regops vfio_ccw_schib_region_ops = {
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.read = vfio_ccw_schib_region_read,
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.write = vfio_ccw_schib_region_write,
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.release = vfio_ccw_schib_region_release,
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};
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int vfio_ccw_register_schib_dev_regions(struct vfio_ccw_private *private)
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{
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return vfio_ccw_register_dev_region(private,
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VFIO_REGION_SUBTYPE_CCW_SCHIB,
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&vfio_ccw_schib_region_ops,
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sizeof(struct ccw_schib_region),
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VFIO_REGION_INFO_FLAG_READ,
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private->schib_region);
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}
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static ssize_t vfio_ccw_crw_region_read(struct vfio_ccw_private *private,
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char __user *buf, size_t count,
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loff_t *ppos)
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{
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unsigned int i = VFIO_CCW_OFFSET_TO_INDEX(*ppos) - VFIO_CCW_NUM_REGIONS;
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loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;
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struct ccw_crw_region *region;
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struct vfio_ccw_crw *crw;
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int ret;
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if (pos + count > sizeof(*region))
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return -EINVAL;
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crw = list_first_entry_or_null(&private->crw,
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struct vfio_ccw_crw, next);
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if (crw)
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list_del(&crw->next);
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mutex_lock(&private->io_mutex);
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region = private->region[i].data;
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if (crw)
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memcpy(®ion->crw, &crw->crw, sizeof(region->crw));
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if (copy_to_user(buf, (void *)region + pos, count))
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ret = -EFAULT;
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else
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ret = count;
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region->crw = 0;
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mutex_unlock(&private->io_mutex);
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kfree(crw);
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/* Notify the guest if more CRWs are on our queue */
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if (!list_empty(&private->crw) && private->crw_trigger)
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eventfd_signal(private->crw_trigger);
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return ret;
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}
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static ssize_t vfio_ccw_crw_region_write(struct vfio_ccw_private *private,
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const char __user *buf, size_t count,
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loff_t *ppos)
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{
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return -EINVAL;
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}
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static void vfio_ccw_crw_region_release(struct vfio_ccw_private *private,
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struct vfio_ccw_region *region)
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{
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}
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static const struct vfio_ccw_regops vfio_ccw_crw_region_ops = {
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.read = vfio_ccw_crw_region_read,
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.write = vfio_ccw_crw_region_write,
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.release = vfio_ccw_crw_region_release,
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};
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int vfio_ccw_register_crw_dev_regions(struct vfio_ccw_private *private)
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{
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return vfio_ccw_register_dev_region(private,
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VFIO_REGION_SUBTYPE_CCW_CRW,
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&vfio_ccw_crw_region_ops,
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sizeof(struct ccw_crw_region),
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VFIO_REGION_INFO_FLAG_READ,
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private->crw_region);
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}
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