nvme-ns device is registered to a nvme controller device during the initialization in nvme_register_namespace() in case that 'bus' property is given which means it's mapped to a single controller. This patch introduced a new property 'subsys' just like the controller device instance did to map a namespace to a NVMe subsystem. If 'subsys' property is given to the nvme-ns device, it will belong to the specified subsystem and will be attached to all controllers in that subsystem by enabling shared namespace capability in NMIC(Namespace Multi-path I/O and Namespace Capabilities) in Identify Namespace. Usage: -device nvme-subsys,id=subsys0 -device nvme,serial=foo,id=nvme0,subsys=subsys0 -device nvme,serial=bar,id=nvme1,subsys=subsys0 -device nvme,serial=baz,id=nvme2,subsys=subsys0 -device nvme-ns,id=ns1,drive=<drv>,nsid=1,subsys=subsys0 # Shared -device nvme-ns,id=ns2,drive=<drv>,nsid=2,bus=nvme2 # Non-shared In the above example, 'ns1' will be shared to 'nvme0' and 'nvme1' in the same subsystem. On the other hand, 'ns2' will be attached to the 'nvme2' only as a private namespace in that subsystem. All the namespace with 'subsys' parameter will attach all controllers in the subsystem to the namespace by default. Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com> Tested-by: Klaus Jensen <k.jensen@samsung.com> Reviewed-by: Klaus Jensen <k.jensen@samsung.com> Reviewed-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
/*
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* QEMU NVM Express Subsystem: nvme-subsys
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*
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* Copyright (c) 2021 Minwoo Im <minwoo.im.dev@gmail.com>
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*
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* This code is licensed under the GNU GPL v2. Refer COPYING.
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*/
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#include "qemu/units.h"
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#include "qemu/osdep.h"
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#include "qemu/uuid.h"
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#include "qemu/iov.h"
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#include "qemu/cutils.h"
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#include "qapi/error.h"
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#include "hw/qdev-properties.h"
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#include "hw/qdev-core.h"
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#include "hw/block/block.h"
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#include "block/aio.h"
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#include "block/accounting.h"
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#include "sysemu/sysemu.h"
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#include "hw/pci/pci.h"
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#include "nvme.h"
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#include "nvme-subsys.h"
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int nvme_subsys_register_ctrl(NvmeCtrl *n, Error **errp)
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{
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NvmeSubsystem *subsys = n->subsys;
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int cntlid;
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for (cntlid = 0; cntlid < ARRAY_SIZE(subsys->ctrls); cntlid++) {
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if (!subsys->ctrls[cntlid]) {
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break;
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}
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}
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if (cntlid == ARRAY_SIZE(subsys->ctrls)) {
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error_setg(errp, "no more free controller id");
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return -1;
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}
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subsys->ctrls[cntlid] = n;
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return cntlid;
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}
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int nvme_subsys_register_ns(NvmeNamespace *ns, Error **errp)
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{
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NvmeSubsystem *subsys = ns->subsys;
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NvmeCtrl *n;
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int i;
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if (subsys->namespaces[nvme_nsid(ns)]) {
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error_setg(errp, "namespace %d already registerd to subsy %s",
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nvme_nsid(ns), subsys->parent_obj.id);
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return -1;
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}
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subsys->namespaces[nvme_nsid(ns)] = ns;
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for (i = 0; i < ARRAY_SIZE(subsys->ctrls); i++) {
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n = subsys->ctrls[i];
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if (n && nvme_register_namespace(n, ns, errp)) {
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return -1;
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}
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}
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return 0;
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}
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static void nvme_subsys_setup(NvmeSubsystem *subsys)
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{
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const char *nqn = subsys->params.nqn ?
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subsys->params.nqn : subsys->parent_obj.id;
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snprintf((char *)subsys->subnqn, sizeof(subsys->subnqn),
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"nqn.2019-08.org.qemu:%s", nqn);
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}
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static void nvme_subsys_realize(DeviceState *dev, Error **errp)
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{
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NvmeSubsystem *subsys = NVME_SUBSYS(dev);
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nvme_subsys_setup(subsys);
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}
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static Property nvme_subsystem_props[] = {
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DEFINE_PROP_STRING("nqn", NvmeSubsystem, params.nqn),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void nvme_subsys_class_init(ObjectClass *oc, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(oc);
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set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
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dc->realize = nvme_subsys_realize;
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dc->desc = "Virtual NVMe subsystem";
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device_class_set_props(dc, nvme_subsystem_props);
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}
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static const TypeInfo nvme_subsys_info = {
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.name = TYPE_NVME_SUBSYS,
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.parent = TYPE_DEVICE,
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.class_init = nvme_subsys_class_init,
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.instance_size = sizeof(NvmeSubsystem),
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};
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static void nvme_subsys_register_types(void)
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{
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type_register_static(&nvme_subsys_info);
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}
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type_init(nvme_subsys_register_types)
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