151 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Channel path related status regions for vfio_ccw4 *5 * Copyright IBM Corp. 20206 *7 * Author(s): Farhan Ali <alifm@linux.ibm.com>8 * Eric Farman <farman@linux.ibm.com>9 */10 11#include <linux/slab.h>12#include <linux/vfio.h>13#include "vfio_ccw_private.h"14 15static ssize_t vfio_ccw_schib_region_read(struct vfio_ccw_private *private,16 char __user *buf, size_t count,17 loff_t *ppos)18{19 struct subchannel *sch = to_subchannel(private->vdev.dev->parent);20 unsigned int i = VFIO_CCW_OFFSET_TO_INDEX(*ppos) - VFIO_CCW_NUM_REGIONS;21 loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;22 struct ccw_schib_region *region;23 int ret;24 25 if (pos + count > sizeof(*region))26 return -EINVAL;27 28 mutex_lock(&private->io_mutex);29 region = private->region[i].data;30 31 if (cio_update_schib(sch)) {32 ret = -ENODEV;33 goto out;34 }35 36 memcpy(region, &sch->schib, sizeof(*region));37 38 if (copy_to_user(buf, (void *)region + pos, count)) {39 ret = -EFAULT;40 goto out;41 }42 43 ret = count;44 45out:46 mutex_unlock(&private->io_mutex);47 return ret;48}49 50static ssize_t vfio_ccw_schib_region_write(struct vfio_ccw_private *private,51 const char __user *buf, size_t count,52 loff_t *ppos)53{54 return -EINVAL;55}56 57 58static void vfio_ccw_schib_region_release(struct vfio_ccw_private *private,59 struct vfio_ccw_region *region)60{61 62}63 64static const struct vfio_ccw_regops vfio_ccw_schib_region_ops = {65 .read = vfio_ccw_schib_region_read,66 .write = vfio_ccw_schib_region_write,67 .release = vfio_ccw_schib_region_release,68};69 70int vfio_ccw_register_schib_dev_regions(struct vfio_ccw_private *private)71{72 return vfio_ccw_register_dev_region(private,73 VFIO_REGION_SUBTYPE_CCW_SCHIB,74 &vfio_ccw_schib_region_ops,75 sizeof(struct ccw_schib_region),76 VFIO_REGION_INFO_FLAG_READ,77 private->schib_region);78}79 80static ssize_t vfio_ccw_crw_region_read(struct vfio_ccw_private *private,81 char __user *buf, size_t count,82 loff_t *ppos)83{84 unsigned int i = VFIO_CCW_OFFSET_TO_INDEX(*ppos) - VFIO_CCW_NUM_REGIONS;85 loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;86 struct ccw_crw_region *region;87 struct vfio_ccw_crw *crw;88 int ret;89 90 if (pos + count > sizeof(*region))91 return -EINVAL;92 93 crw = list_first_entry_or_null(&private->crw,94 struct vfio_ccw_crw, next);95 96 if (crw)97 list_del(&crw->next);98 99 mutex_lock(&private->io_mutex);100 region = private->region[i].data;101 102 if (crw)103 memcpy(®ion->crw, &crw->crw, sizeof(region->crw));104 105 if (copy_to_user(buf, (void *)region + pos, count))106 ret = -EFAULT;107 else108 ret = count;109 110 region->crw = 0;111 112 mutex_unlock(&private->io_mutex);113 114 kfree(crw);115 116 /* Notify the guest if more CRWs are on our queue */117 if (!list_empty(&private->crw) && private->crw_trigger)118 eventfd_signal(private->crw_trigger);119 120 return ret;121}122 123static ssize_t vfio_ccw_crw_region_write(struct vfio_ccw_private *private,124 const char __user *buf, size_t count,125 loff_t *ppos)126{127 return -EINVAL;128}129 130static void vfio_ccw_crw_region_release(struct vfio_ccw_private *private,131 struct vfio_ccw_region *region)132{133 134}135 136static const struct vfio_ccw_regops vfio_ccw_crw_region_ops = {137 .read = vfio_ccw_crw_region_read,138 .write = vfio_ccw_crw_region_write,139 .release = vfio_ccw_crw_region_release,140};141 142int vfio_ccw_register_crw_dev_regions(struct vfio_ccw_private *private)143{144 return vfio_ccw_register_dev_region(private,145 VFIO_REGION_SUBTYPE_CCW_CRW,146 &vfio_ccw_crw_region_ops,147 sizeof(struct ccw_crw_region),148 VFIO_REGION_INFO_FLAG_READ,149 private->crw_region);150}151