Re: [Qemu-devel] [PATCH v7 06/13] s390x/css: device support for s390-ccw passthrough

Auger Eric
2017-05-09T08:18:59Z

Hi

On 05/05/2017 04:03, Dong Jia Shi wrote:
> In order to support subchannels pass-through, we introduce a s390
> subchannel device called "s390-ccw" to hold the real subchannel info.
> The s390-ccw devices inherit from the abstract CcwDevice which connect
> to the existing virtual-css-bus.
>
> Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Thanks

Eric
> ---
> hw/s390x/Makefile.objs | 1 +
> hw/s390x/s390-ccw.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++++
> hw/s390x/s390-ccw.h | 38 ++++++++++++++
> 3 files changed, 177 insertions(+)
> create mode 100644 hw/s390x/s390-ccw.c
> create mode 100644 hw/s390x/s390-ccw.h
>
> diff --git a/hw/s390x/Makefile.objs b/hw/s390x/Makefile.objs
> index 41ac4ec..72a3d37 100644
> --- a/hw/s390x/Makefile.objs
> +++ b/hw/s390x/Makefile.objs
> @@ -13,3 +13,4 @@ obj-y += ccw-device.o
> obj-y += s390-pci-bus.o s390-pci-inst.o
> obj-y += s390-skeys.o
> obj-$(CONFIG_KVM) += s390-skeys-kvm.o
> +obj-y += s390-ccw.o
> diff --git a/hw/s390x/s390-ccw.c b/hw/s390x/s390-ccw.c
> new file mode 100644
> index 0000000..b1aadcd
> --- /dev/null
> +++ b/hw/s390x/s390-ccw.c
> @@ -0,0 +1,138 @@
> +/*
> + * 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 "qapi/error.h"
> +#include "hw/sysbus.h"
> +#include "libgen.h"
> +#include "hw/s390x/css.h"
> +#include "hw/s390x/css-bridge.h"
> +#include "s390-ccw.h"
> +
> +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_strdup(basename(dev_path));
> +
> + tmp = basename(dirname(dev_path));
> + sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid);
> +
> + 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);
> + BusState *qbus = qdev_get_parent_bus(parent);
> + VirtualCssBus *cbus = VIRTUAL_CSS_BUS(qbus);
> + 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, false, cbus->squash_mcss, &err);
> + if (!sch) {
> + goto out_mdevid_free;
> + }
> + sch->driver_data = cdev;
> +
> + 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, Error **errp)
> +{
> + 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_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_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)
> diff --git a/hw/s390x/s390-ccw.h b/hw/s390x/s390-ccw.h
> new file mode 100644
> index 0000000..b58d8e9
> --- /dev/null
> +++ b/hw/s390x/s390-ccw.h
> @@ -0,0 +1,38 @@
> +/*
> + * 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>
> + *
> + * 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.
> + */
> +
> +#ifndef HW_S390_CCW_H
> +#define HW_S390_CCW_H
> +
> +#include "hw/s390x/ccw-device.h"
> +
> +#define TYPE_S390_CCW "s390-ccw"
> +#define S390_CCW_DEVICE(obj) \
> + OBJECT_CHECK(S390CCWDevice, (obj), TYPE_S390_CCW)
> +#define S390_CCW_DEVICE_CLASS(klass) \
> + OBJECT_CLASS_CHECK(S390CCWDeviceClass, (klass), TYPE_S390_CCW)
> +#define S390_CCW_DEVICE_GET_CLASS(obj) \
> + OBJECT_GET_CLASS(S390CCWDeviceClass, (obj), TYPE_S390_CCW)
> +
> +typedef struct S390CCWDevice {
> + CcwDevice parent_obj;
> + CssDevId hostid;
> + char *mdevid;
> +} S390CCWDevice;
> +
> +typedef struct S390CCWDeviceClass {
> + CCWDeviceClass parent_class;
> + void (*realize)(S390CCWDevice *dev, char *sysfsdev, Error **errp);
> + void (*unrealize)(S390CCWDevice *dev, Error **errp);
> +} S390CCWDeviceClass;
> +
> +#endif
>