1 // SPDX-License-Identifier: GPL-2.0
3 * Channel path related status regions for vfio_ccw
5 * Copyright IBM Corp. 2020
7 * Author(s): Farhan Ali <alifm@linux.ibm.com>
8 * Eric Farman <farman@linux.ibm.com>
11 #include <linux/vfio.h>
12 #include "vfio_ccw_private.h"
14 static ssize_t vfio_ccw_schib_region_read(struct vfio_ccw_private *private,
15 char __user *buf, size_t count,
18 unsigned int i = VFIO_CCW_OFFSET_TO_INDEX(*ppos) - VFIO_CCW_NUM_REGIONS;
19 loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;
20 struct ccw_schib_region *region;
23 if (pos + count > sizeof(*region))
26 mutex_lock(&private->io_mutex);
27 region = private->region[i].data;
29 if (cio_update_schib(private->sch)) {
34 memcpy(region, &private->sch->schib, sizeof(*region));
36 if (copy_to_user(buf, (void *)region + pos, count)) {
44 mutex_unlock(&private->io_mutex);
48 static ssize_t vfio_ccw_schib_region_write(struct vfio_ccw_private *private,
49 const char __user *buf, size_t count,
56 static void vfio_ccw_schib_region_release(struct vfio_ccw_private *private,
57 struct vfio_ccw_region *region)
62 const struct vfio_ccw_regops vfio_ccw_schib_region_ops = {
63 .read = vfio_ccw_schib_region_read,
64 .write = vfio_ccw_schib_region_write,
65 .release = vfio_ccw_schib_region_release,
68 int vfio_ccw_register_schib_dev_regions(struct vfio_ccw_private *private)
70 return vfio_ccw_register_dev_region(private,
71 VFIO_REGION_SUBTYPE_CCW_SCHIB,
72 &vfio_ccw_schib_region_ops,
73 sizeof(struct ccw_schib_region),
74 VFIO_REGION_INFO_FLAG_READ,
75 private->schib_region);
78 static ssize_t vfio_ccw_crw_region_read(struct vfio_ccw_private *private,
79 char __user *buf, size_t count,
82 unsigned int i = VFIO_CCW_OFFSET_TO_INDEX(*ppos) - VFIO_CCW_NUM_REGIONS;
83 loff_t pos = *ppos & VFIO_CCW_OFFSET_MASK;
84 struct ccw_crw_region *region;
85 struct vfio_ccw_crw *crw;
88 if (pos + count > sizeof(*region))
91 crw = list_first_entry_or_null(&private->crw,
92 struct vfio_ccw_crw, next);
97 mutex_lock(&private->io_mutex);
98 region = private->region[i].data;
101 memcpy(®ion->crw, &crw->crw, sizeof(region->crw));
103 if (copy_to_user(buf, (void *)region + pos, count))
110 mutex_unlock(&private->io_mutex);
114 /* Notify the guest if more CRWs are on our queue */
115 if (!list_empty(&private->crw) && private->crw_trigger)
116 eventfd_signal(private->crw_trigger, 1);
121 static ssize_t vfio_ccw_crw_region_write(struct vfio_ccw_private *private,
122 const char __user *buf, size_t count,
128 static void vfio_ccw_crw_region_release(struct vfio_ccw_private *private,
129 struct vfio_ccw_region *region)
134 const struct vfio_ccw_regops vfio_ccw_crw_region_ops = {
135 .read = vfio_ccw_crw_region_read,
136 .write = vfio_ccw_crw_region_write,
137 .release = vfio_ccw_crw_region_release,
140 int vfio_ccw_register_crw_dev_regions(struct vfio_ccw_private *private)
142 return vfio_ccw_register_dev_region(private,
143 VFIO_REGION_SUBTYPE_CCW_CRW,
144 &vfio_ccw_crw_region_ops,
145 sizeof(struct ccw_crw_region),
146 VFIO_REGION_INFO_FLAG_READ,
147 private->crw_region);