From 06e686eaab344b1d38125e49abeb31a416428201 Mon Sep 17 00:00:00 2001 From: Cornelia Huck Date: Fri, 1 Apr 2016 13:42:04 +0200 Subject: s390x/css: introduce property type for device ids Let's introduce a CssDevId to handle device ids of the xx.x.xxxx type used for channel devices. This has some benefits: - We can use them in virtio-ccw and split the validity checks for a channel device id in general from the constraint checking within the virtio-ccw scope. - We can reuse the device id type for future non-virtio channel devices. While we're at it, improve the validity checks and disallow e.g. trailing characters. Suggested-by: Dong Jia Shi Acked-by: David Hildenbrand Reviewed-by: Dong Jia Shi Signed-off-by: Cornelia Huck --- hw/s390x/css.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++ hw/s390x/virtio-ccw.c | 79 ++++++++++++++++++++----------------------------- hw/s390x/virtio-ccw.h | 2 +- 3 files changed, 114 insertions(+), 48 deletions(-) (limited to 'hw/s390x') diff --git a/hw/s390x/css.c b/hw/s390x/css.c index aceb1c0ee1..76668814da 100644 --- a/hw/s390x/css.c +++ b/hw/s390x/css.c @@ -11,6 +11,7 @@ #include "qemu/osdep.h" #include "qapi/error.h" +#include "qapi/visitor.h" #include #include "qemu/bitops.h" #include "exec/address-spaces.h" @@ -1681,3 +1682,83 @@ void css_reset(void) channel_subsys.max_cssid = 0; channel_subsys.max_ssid = 0; } + +static void get_css_devid(Object *obj, Visitor *v, const char *name, + void *opaque, Error **errp) +{ + DeviceState *dev = DEVICE(obj); + Property *prop = opaque; + CssDevId *dev_id = qdev_get_prop_ptr(dev, prop); + char buffer[] = "xx.x.xxxx"; + char *p = buffer; + int r; + + if (dev_id->valid) { + + r = snprintf(buffer, sizeof(buffer), "%02x.%1x.%04x", dev_id->cssid, + dev_id->ssid, dev_id->devid); + assert(r == sizeof(buffer) - 1); + + /* drop leading zero */ + if (dev_id->cssid <= 0xf) { + p++; + } + } else { + snprintf(buffer, sizeof(buffer), ""); + } + + visit_type_str(v, name, &p, errp); +} + +/* + * parse .. and assert valid range for cssid/ssid + */ +static void set_css_devid(Object *obj, Visitor *v, const char *name, + void *opaque, Error **errp) +{ + DeviceState *dev = DEVICE(obj); + Property *prop = opaque; + CssDevId *dev_id = qdev_get_prop_ptr(dev, prop); + Error *local_err = NULL; + char *str; + int num, n1, n2; + unsigned int cssid, ssid, devid; + + if (dev->realized) { + qdev_prop_set_after_realize(dev, name, errp); + return; + } + + visit_type_str(v, name, &str, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + num = sscanf(str, "%2x.%1x%n.%4x%n", &cssid, &ssid, &n1, &devid, &n2); + if (num != 3 || (n2 - n1) != 5 || strlen(str) != n2) { + error_set_from_qdev_prop_error(errp, EINVAL, dev, prop, str); + goto out; + } + if ((cssid > MAX_CSSID) || (ssid > MAX_SSID)) { + error_setg(errp, "Invalid cssid or ssid: cssid %x, ssid %x", + cssid, ssid); + goto out; + } + + dev_id->cssid = cssid; + dev_id->ssid = ssid; + dev_id->devid = devid; + dev_id->valid = true; + +out: + g_free(str); +} + +PropertyInfo css_devid_propinfo = { + .name = "str", + .description = "Identifier of an I/O device in the channel " + "subsystem, example: fe.1.23ab", + .get = get_css_devid, + .set = set_css_devid, +}; diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c index 2b68e5e87d..e62a3a344e 100644 --- a/hw/s390x/virtio-ccw.c +++ b/hw/s390x/virtio-ccw.c @@ -737,14 +737,9 @@ static void virtio_sch_disable_cb(SubchDev *sch) static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp) { - unsigned int cssid = 0; - unsigned int ssid = 0; unsigned int schid; - unsigned int devno; - bool have_devno = false; bool found = false; SubchDev *sch; - int num; Error *err = NULL; VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev); @@ -763,54 +758,44 @@ static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp) * Use a device number if provided. Otherwise, fall back to subchannel * number. */ - if (dev->bus_id) { - num = sscanf(dev->bus_id, "%x.%x.%04x", &cssid, &ssid, &devno); - if (num == 3) { - if ((cssid > MAX_CSSID) || (ssid > MAX_SSID)) { - error_setg(errp, "Invalid cssid or ssid: cssid %x, ssid %x", - cssid, ssid); - goto out_err; - } - /* Enforce use of virtual cssid. */ - if (cssid != VIRTUAL_CSSID) { - error_setg(errp, "cssid %x not valid for virtio devices", - cssid); - goto out_err; - } - if (css_devno_used(cssid, ssid, devno)) { + if (dev->bus_id.valid) { + /* Enforce use of virtual cssid. */ + if (dev->bus_id.cssid != VIRTUAL_CSSID) { + error_setg(errp, "cssid %x not valid for virtio devices", + dev->bus_id.cssid); + goto out_err; + } + if (css_devno_used(dev->bus_id.cssid, dev->bus_id.ssid, + dev->bus_id.devid)) { error_setg(errp, "Device %x.%x.%04x already exists", - cssid, ssid, devno); + dev->bus_id.cssid, dev->bus_id.ssid, + dev->bus_id.devid); goto out_err; - } - sch->cssid = cssid; - sch->ssid = ssid; - sch->devno = devno; - have_devno = true; - } else { - error_setg(errp, "Malformed devno parameter '%s'", dev->bus_id); - goto out_err; } - } + sch->cssid = dev->bus_id.cssid; + sch->ssid = dev->bus_id.ssid; + sch->devno = dev->bus_id.devid; - /* Find the next free id. */ - if (have_devno) { + /* Find the next free id. */ for (schid = 0; schid <= MAX_SCHID; schid++) { - if (!css_find_subch(1, cssid, ssid, schid)) { + if (!css_find_subch(1, sch->cssid, sch->ssid, schid)) { sch->schid = schid; - css_subch_assign(cssid, ssid, schid, devno, sch); + css_subch_assign(sch->cssid, sch->ssid, sch->schid, + sch->devno, sch); found = true; break; } } if (!found) { error_setg(errp, "No free subchannel found for %x.%x.%04x", - cssid, ssid, devno); + sch->cssid, sch->ssid, sch->devno); goto out_err; } - trace_virtio_ccw_new_device(cssid, ssid, schid, devno, - "user-configured"); + trace_virtio_ccw_new_device(sch->cssid, sch->ssid, sch->schid, + sch->devno, "user-configured"); } else { - cssid = VIRTUAL_CSSID; + unsigned int cssid = VIRTUAL_CSSID, ssid, devno; + for (ssid = 0; ssid <= MAX_SSID; ssid++) { for (schid = 0; schid <= MAX_SCHID; schid++) { if (!css_find_subch(1, cssid, ssid, schid)) { @@ -868,7 +853,7 @@ static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp) } if (err) { error_propagate(errp, err); - css_subch_assign(cssid, ssid, schid, devno, NULL); + css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); goto out_err; } @@ -1516,7 +1501,7 @@ static void virtio_ccw_device_unplugged(DeviceState *d) /**************** Virtio-ccw Bus Device Descriptions *******************/ static Property virtio_ccw_net_properties[] = { - DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id), + DEFINE_PROP_CSS_DEV_ID("devno", VirtioCcwDevice, bus_id), DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags, VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true), DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev, @@ -1545,7 +1530,7 @@ static const TypeInfo virtio_ccw_net = { }; static Property virtio_ccw_blk_properties[] = { - DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id), + DEFINE_PROP_CSS_DEV_ID("devno", VirtioCcwDevice, bus_id), DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags, VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true), DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev, @@ -1574,7 +1559,7 @@ static const TypeInfo virtio_ccw_blk = { }; static Property virtio_ccw_serial_properties[] = { - DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id), + DEFINE_PROP_CSS_DEV_ID("devno", VirtioCcwDevice, bus_id), DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags, VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true), DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev, @@ -1603,7 +1588,7 @@ static const TypeInfo virtio_ccw_serial = { }; static Property virtio_ccw_balloon_properties[] = { - DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id), + DEFINE_PROP_CSS_DEV_ID("devno", VirtioCcwDevice, bus_id), DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags, VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true), DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev, @@ -1632,7 +1617,7 @@ static const TypeInfo virtio_ccw_balloon = { }; static Property virtio_ccw_scsi_properties[] = { - DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id), + DEFINE_PROP_CSS_DEV_ID("devno", VirtioCcwDevice, bus_id), DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags, VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true), DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev, @@ -1662,7 +1647,7 @@ static const TypeInfo virtio_ccw_scsi = { #ifdef CONFIG_VHOST_SCSI static Property vhost_ccw_scsi_properties[] = { - DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id), + DEFINE_PROP_CSS_DEV_ID("devno", VirtioCcwDevice, bus_id), DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev, VIRTIO_CCW_MAX_REV), DEFINE_PROP_END_OF_LIST(), @@ -1700,7 +1685,7 @@ static void virtio_ccw_rng_instance_init(Object *obj) } static Property virtio_ccw_rng_properties[] = { - DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id), + DEFINE_PROP_CSS_DEV_ID("devno", VirtioCcwDevice, bus_id), DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags, VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true), DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev, @@ -1856,7 +1841,7 @@ static const TypeInfo virtio_ccw_bus_info = { #ifdef CONFIG_VIRTFS static Property virtio_ccw_9p_properties[] = { - DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id), + DEFINE_PROP_CSS_DEV_ID("devno", VirtioCcwDevice, bus_id), DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags, VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true), DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev, diff --git a/hw/s390x/virtio-ccw.h b/hw/s390x/virtio-ccw.h index 86b9edb18f..0bfb5d93c6 100644 --- a/hw/s390x/virtio-ccw.h +++ b/hw/s390x/virtio-ccw.h @@ -80,7 +80,7 @@ typedef struct VirtIOCCWDeviceClass { struct VirtioCcwDevice { DeviceState parent_obj; SubchDev *sch; - char *bus_id; + CssDevId bus_id; int revision; uint32_t max_rev; VirtioBusState bus; -- cgit v1.2.3