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/*
* s390 CCW Assignment Support
*
* Copyright 2017 IBM Corp
* Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
* Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
* Pierre Morel <pmorel@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2
* or (at your option) any later version. See the COPYING file in the
* top-level directory.
*/
#include "qemu/osdep.h"
#include <libgen.h>
#include "qapi/error.h"
#include "qemu/module.h"
#include "hw/sysbus.h"
#include "hw/s390x/css.h"
#include "hw/s390x/css-bridge.h"
#include "hw/s390x/s390-ccw.h"
#include "sysemu/sysemu.h"
IOInstEnding s390_ccw_cmd_request(SubchDev *sch)
{
S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
if (!cdc->handle_request) {
return IOINST_CC_STATUS_PRESENT;
}
return cdc->handle_request(sch);
}
int s390_ccw_halt(SubchDev *sch)
{
S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
if (!cdc->handle_halt) {
return -ENOSYS;
}
return cdc->handle_halt(sch);
}
int s390_ccw_clear(SubchDev *sch)
{
S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
if (!cdc->handle_clear) {
return -ENOSYS;
}
return cdc->handle_clear(sch);
}
IOInstEnding s390_ccw_store(SubchDev *sch)
{
S390CCWDeviceClass *cdc = NULL;
int ret = IOINST_CC_EXPECTED;
/*
* This code is called for both virtual and passthrough devices,
* but only applies to to the latter. This ugly check makes that
* distinction for us.
*/
if (object_dynamic_cast(OBJECT(sch->driver_data), TYPE_S390_CCW)) {
cdc = S390_CCW_DEVICE_GET_CLASS(sch->driver_data);
}
if (cdc && cdc->handle_store) {
ret = cdc->handle_store(sch);
}
return ret;
}
static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
char *sysfsdev,
Error **errp)
{
unsigned int cssid, ssid, devid;
char dev_path[PATH_MAX] = {0}, *tmp;
if (!sysfsdev) {
error_setg(errp, "No host device provided");
error_append_hint(errp,
"Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
return;
}
if (!realpath(sysfsdev, dev_path)) {
error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
return;
}
cdev->mdevid = g_path_get_basename(dev_path);
tmp = basename(dirname(dev_path));
if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
error_setg_errno(errp, errno, "Failed to read %s", tmp);
return;
}
cdev->hostid.cssid = cssid;
cdev->hostid.ssid = ssid;
cdev->hostid.devid = devid;
cdev->hostid.valid = true;
}
static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
{
CcwDevice *ccw_dev = CCW_DEVICE(cdev);
CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
DeviceState *parent = DEVICE(ccw_dev);
SubchDev *sch;
int ret;
Error *err = NULL;
s390_ccw_get_dev_info(cdev, sysfsdev, &err);
if (err) {
goto out_err_propagate;
}
sch = css_create_sch(ccw_dev->devno, &err);
if (!sch) {
goto out_mdevid_free;
}
sch->driver_data = cdev;
sch->do_subchannel_work = do_subchannel_work_passthrough;
ccw_dev->sch = sch;
ret = css_sch_build_schib(sch, &cdev->hostid);
if (ret) {
error_setg_errno(&err, -ret, "%s: Failed to build initial schib",
__func__);
goto out_err;
}
ck->realize(ccw_dev, &err);
if (err) {
goto out_err;
}
css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
parent->hotplugged, 1);
return;
out_err:
css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
ccw_dev->sch = NULL;
g_free(sch);
out_mdevid_free:
g_free(cdev->mdevid);
out_err_propagate:
error_propagate(errp, err);
}
static void s390_ccw_unrealize(S390CCWDevice *cdev)
{
CcwDevice *ccw_dev = CCW_DEVICE(cdev);
SubchDev *sch = ccw_dev->sch;
if (sch) {
css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
g_free(sch);
ccw_dev->sch = NULL;
}
g_free(cdev->mdevid);
}
static void s390_ccw_instance_init(Object *obj)
{
S390CCWDevice *dev = S390_CCW_DEVICE(obj);
device_add_bootindex_property(obj, &dev->bootindex, "bootindex",
"/disk@0,0", DEVICE(obj));
}
static void s390_ccw_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
cdc->realize = s390_ccw_realize;
cdc->unrealize = s390_ccw_unrealize;
}
static const TypeInfo s390_ccw_info = {
.name = TYPE_S390_CCW,
.parent = TYPE_CCW_DEVICE,
.instance_init = s390_ccw_instance_init,
.instance_size = sizeof(S390CCWDevice),
.class_size = sizeof(S390CCWDeviceClass),
.class_init = s390_ccw_class_init,
.abstract = true,
};
static void register_s390_ccw_type(void)
{
type_register_static(&s390_ccw_info);
}
type_init(register_s390_ccw_type)
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