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/*
* QEMU NVM Express Subsystem: nvme-subsys
*
* Copyright (c) 2021 Minwoo Im <minwoo.im.dev@gmail.com>
*
* This code is licensed under the GNU GPL v2. Refer COPYING.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "nvme.h"
static int nvme_subsys_reserve_cntlids(NvmeCtrl *n, int start, int num)
{
NvmeSubsystem *subsys = n->subsys;
NvmeSecCtrlList *list = &n->sec_ctrl_list;
NvmeSecCtrlEntry *sctrl;
int i, cnt = 0;
for (i = start; i < ARRAY_SIZE(subsys->ctrls) && cnt < num; i++) {
if (!subsys->ctrls[i]) {
sctrl = &list->sec[cnt];
sctrl->scid = cpu_to_le16(i);
subsys->ctrls[i] = SUBSYS_SLOT_RSVD;
cnt++;
}
}
return cnt;
}
static void nvme_subsys_unreserve_cntlids(NvmeCtrl *n)
{
NvmeSubsystem *subsys = n->subsys;
NvmeSecCtrlList *list = &n->sec_ctrl_list;
NvmeSecCtrlEntry *sctrl;
int i, cntlid;
for (i = 0; i < n->params.sriov_max_vfs; i++) {
sctrl = &list->sec[i];
cntlid = le16_to_cpu(sctrl->scid);
if (cntlid) {
assert(subsys->ctrls[cntlid] == SUBSYS_SLOT_RSVD);
subsys->ctrls[cntlid] = NULL;
sctrl->scid = 0;
}
}
}
int nvme_subsys_register_ctrl(NvmeCtrl *n, Error **errp)
{
NvmeSubsystem *subsys = n->subsys;
NvmeSecCtrlEntry *sctrl = nvme_sctrl(n);
int cntlid, nsid, num_rsvd, num_vfs = n->params.sriov_max_vfs;
if (pci_is_vf(&n->parent_obj)) {
cntlid = le16_to_cpu(sctrl->scid);
} else {
for (cntlid = 0; cntlid < ARRAY_SIZE(subsys->ctrls); cntlid++) {
if (!subsys->ctrls[cntlid]) {
break;
}
}
if (cntlid == ARRAY_SIZE(subsys->ctrls)) {
error_setg(errp, "no more free controller id");
return -1;
}
num_rsvd = nvme_subsys_reserve_cntlids(n, cntlid + 1, num_vfs);
if (num_rsvd != num_vfs) {
nvme_subsys_unreserve_cntlids(n);
error_setg(errp,
"no more free controller ids for secondary controllers");
return -1;
}
}
if (!subsys->serial) {
subsys->serial = g_strdup(n->params.serial);
} else if (strcmp(subsys->serial, n->params.serial)) {
error_setg(errp, "invalid controller serial");
return -1;
}
subsys->ctrls[cntlid] = n;
for (nsid = 1; nsid < ARRAY_SIZE(subsys->namespaces); nsid++) {
NvmeNamespace *ns = subsys->namespaces[nsid];
if (ns && ns->params.shared && !ns->params.detached) {
nvme_attach_ns(n, ns);
}
}
return cntlid;
}
void nvme_subsys_unregister_ctrl(NvmeSubsystem *subsys, NvmeCtrl *n)
{
if (pci_is_vf(&n->parent_obj)) {
subsys->ctrls[n->cntlid] = SUBSYS_SLOT_RSVD;
} else {
subsys->ctrls[n->cntlid] = NULL;
nvme_subsys_unreserve_cntlids(n);
}
n->cntlid = -1;
}
static void nvme_subsys_setup(NvmeSubsystem *subsys)
{
const char *nqn = subsys->params.nqn ?
subsys->params.nqn : subsys->parent_obj.id;
snprintf((char *)subsys->subnqn, sizeof(subsys->subnqn),
"nqn.2019-08.org.qemu:%s", nqn);
}
static void nvme_subsys_realize(DeviceState *dev, Error **errp)
{
NvmeSubsystem *subsys = NVME_SUBSYS(dev);
qbus_init(&subsys->bus, sizeof(NvmeBus), TYPE_NVME_BUS, dev, dev->id);
nvme_subsys_setup(subsys);
}
static Property nvme_subsystem_props[] = {
DEFINE_PROP_STRING("nqn", NvmeSubsystem, params.nqn),
DEFINE_PROP_END_OF_LIST(),
};
static void nvme_subsys_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
dc->realize = nvme_subsys_realize;
dc->desc = "Virtual NVMe subsystem";
dc->hotpluggable = false;
device_class_set_props(dc, nvme_subsystem_props);
}
static const TypeInfo nvme_subsys_info = {
.name = TYPE_NVME_SUBSYS,
.parent = TYPE_DEVICE,
.class_init = nvme_subsys_class_init,
.instance_size = sizeof(NvmeSubsystem),
};
static void nvme_subsys_register_types(void)
{
type_register_static(&nvme_subsys_info);
}
type_init(nvme_subsys_register_types)
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