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-rw-r--r--hw/nvme/subsys.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/hw/nvme/subsys.c b/hw/nvme/subsys.c
new file mode 100644
index 00000000..9d264367
--- /dev/null
+++ b/hw/nvme/subsys.c
@@ -0,0 +1,160 @@
+/*
+ * 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)