xref: /openbmc/qemu/hw/nvme/subsys.c (revision 6fdc5bc1) 
1 /*
2  * QEMU NVM Express Subsystem: nvme-subsys
3  *
4  * Copyright (c) 2021 Minwoo Im <minwoo.im.dev@gmail.com>
5  *
6  * This code is licensed under the GNU GPL v2.  Refer COPYING.
7  */
8 
9 #include "qemu/osdep.h"
10 #include "qemu/units.h"
11 #include "qapi/error.h"
12 
13 #include "nvme.h"
14 
15 #define NVME_DEFAULT_RU_SIZE (96 * MiB)
16 
17 static int nvme_subsys_reserve_cntlids(NvmeCtrl *n, int start, int num)
18 {
19     NvmeSubsystem *subsys = n->subsys;
20     NvmeSecCtrlEntry *list = n->sec_ctrl_list;
21     NvmeSecCtrlEntry *sctrl;
22     int i, cnt = 0;
23 
24     for (i = start; i < ARRAY_SIZE(subsys->ctrls) && cnt < num; i++) {
25         if (!subsys->ctrls[i]) {
26             sctrl = &list[cnt];
27             sctrl->scid = cpu_to_le16(i);
28             subsys->ctrls[i] = SUBSYS_SLOT_RSVD;
29             cnt++;
30         }
31     }
32 
33     return cnt;
34 }
35 
36 static void nvme_subsys_unreserve_cntlids(NvmeCtrl *n)
37 {
38     NvmeSubsystem *subsys = n->subsys;
39     NvmeSecCtrlEntry *list = n->sec_ctrl_list;
40     NvmeSecCtrlEntry *sctrl;
41     int i, cntlid;
42 
43     for (i = 0; i < n->params.sriov_max_vfs; i++) {
44         sctrl = &list[i];
45         cntlid = le16_to_cpu(sctrl->scid);
46 
47         if (cntlid) {
48             assert(subsys->ctrls[cntlid] == SUBSYS_SLOT_RSVD);
49             subsys->ctrls[cntlid] = NULL;
50             sctrl->scid = 0;
51         }
52     }
53 }
54 
55 int nvme_subsys_register_ctrl(NvmeCtrl *n, Error **errp)
56 {
57     NvmeSubsystem *subsys = n->subsys;
58     NvmeSecCtrlEntry *sctrl = nvme_sctrl(n);
59     int cntlid, nsid, num_rsvd, num_vfs = n->params.sriov_max_vfs;
60 
61     if (pci_is_vf(&n->parent_obj)) {
62         cntlid = le16_to_cpu(sctrl->scid);
63     } else {
64         n->sec_ctrl_list = g_new0(NvmeSecCtrlEntry, num_vfs);
65 
66         for (cntlid = 0; cntlid < ARRAY_SIZE(subsys->ctrls); cntlid++) {
67             if (!subsys->ctrls[cntlid]) {
68                 break;
69             }
70         }
71 
72         if (cntlid == ARRAY_SIZE(subsys->ctrls)) {
73             error_setg(errp, "no more free controller id");
74             return -1;
75         }
76 
77         num_rsvd = nvme_subsys_reserve_cntlids(n, cntlid + 1, num_vfs);
78         if (num_rsvd != num_vfs) {
79             nvme_subsys_unreserve_cntlids(n);
80             error_setg(errp,
81                        "no more free controller ids for secondary controllers");
82             return -1;
83         }
84     }
85 
86     if (!subsys->serial) {
87         subsys->serial = g_strdup(n->params.serial);
88     } else if (strcmp(subsys->serial, n->params.serial)) {
89         error_setg(errp, "invalid controller serial");
90         return -1;
91     }
92 
93     subsys->ctrls[cntlid] = n;
94 
95     for (nsid = 1; nsid < ARRAY_SIZE(subsys->namespaces); nsid++) {
96         NvmeNamespace *ns = subsys->namespaces[nsid];
97         if (ns && ns->params.shared && !ns->params.detached) {
98             nvme_attach_ns(n, ns);
99         }
100     }
101 
102     return cntlid;
103 }
104 
105 void nvme_subsys_unregister_ctrl(NvmeSubsystem *subsys, NvmeCtrl *n)
106 {
107     if (pci_is_vf(&n->parent_obj)) {
108         subsys->ctrls[n->cntlid] = SUBSYS_SLOT_RSVD;
109     } else {
110         subsys->ctrls[n->cntlid] = NULL;
111         nvme_subsys_unreserve_cntlids(n);
112     }
113 
114     n->cntlid = -1;
115 }
116 
117 static bool nvme_calc_rgif(uint16_t nruh, uint16_t nrg, uint8_t *rgif)
118 {
119     uint16_t val;
120     unsigned int i;
121 
122     if (unlikely(nrg == 1)) {
123         /* PIDRG_NORGI scenario, all of pid is used for PHID */
124         *rgif = 0;
125         return true;
126     }
127 
128     val = nrg;
129     i = 0;
130     while (val) {
131         val >>= 1;
132         i++;
133     }
134     *rgif = i;
135 
136     /* ensure remaining bits suffice to represent number of phids in a RG */
137     if (unlikely((UINT16_MAX >> i) < nruh)) {
138         *rgif = 0;
139         return false;
140     }
141 
142     return true;
143 }
144 
145 static bool nvme_subsys_setup_fdp(NvmeSubsystem *subsys, Error **errp)
146 {
147     NvmeEnduranceGroup *endgrp = &subsys->endgrp;
148 
149     if (!subsys->params.fdp.runs) {
150         error_setg(errp, "fdp.runs must be non-zero");
151         return false;
152     }
153 
154     endgrp->fdp.runs = subsys->params.fdp.runs;
155 
156     if (!subsys->params.fdp.nrg) {
157         error_setg(errp, "fdp.nrg must be non-zero");
158         return false;
159     }
160 
161     endgrp->fdp.nrg = subsys->params.fdp.nrg;
162 
163     if (!subsys->params.fdp.nruh ||
164         subsys->params.fdp.nruh > NVME_FDP_MAXPIDS) {
165         error_setg(errp, "fdp.nruh must be non-zero and less than %u",
166                    NVME_FDP_MAXPIDS);
167         return false;
168     }
169 
170     endgrp->fdp.nruh = subsys->params.fdp.nruh;
171 
172     if (!nvme_calc_rgif(endgrp->fdp.nruh, endgrp->fdp.nrg, &endgrp->fdp.rgif)) {
173         error_setg(errp,
174                    "cannot derive a valid rgif (nruh %"PRIu16" nrg %"PRIu32")",
175                    endgrp->fdp.nruh, endgrp->fdp.nrg);
176         return false;
177     }
178 
179     endgrp->fdp.ruhs = g_new(NvmeRuHandle, endgrp->fdp.nruh);
180 
181     for (uint16_t ruhid = 0; ruhid < endgrp->fdp.nruh; ruhid++) {
182         endgrp->fdp.ruhs[ruhid] = (NvmeRuHandle) {
183             .ruht = NVME_RUHT_INITIALLY_ISOLATED,
184             .ruha = NVME_RUHA_UNUSED,
185         };
186 
187         endgrp->fdp.ruhs[ruhid].rus = g_new(NvmeReclaimUnit, endgrp->fdp.nrg);
188     }
189 
190     endgrp->fdp.enabled = true;
191 
192     return true;
193 }
194 
195 static bool nvme_subsys_setup(NvmeSubsystem *subsys, Error **errp)
196 {
197     const char *nqn = subsys->params.nqn ?
198         subsys->params.nqn : subsys->parent_obj.id;
199 
200     snprintf((char *)subsys->subnqn, sizeof(subsys->subnqn),
201              "nqn.2019-08.org.qemu:%s", nqn);
202 
203     if (subsys->params.fdp.enabled && !nvme_subsys_setup_fdp(subsys, errp)) {
204         return false;
205     }
206 
207     return true;
208 }
209 
210 static void nvme_subsys_realize(DeviceState *dev, Error **errp)
211 {
212     NvmeSubsystem *subsys = NVME_SUBSYS(dev);
213 
214     qbus_init(&subsys->bus, sizeof(NvmeBus), TYPE_NVME_BUS, dev, dev->id);
215 
216     nvme_subsys_setup(subsys, errp);
217 }
218 
219 static Property nvme_subsystem_props[] = {
220     DEFINE_PROP_STRING("nqn", NvmeSubsystem, params.nqn),
221     DEFINE_PROP_BOOL("fdp", NvmeSubsystem, params.fdp.enabled, false),
222     DEFINE_PROP_SIZE("fdp.runs", NvmeSubsystem, params.fdp.runs,
223                      NVME_DEFAULT_RU_SIZE),
224     DEFINE_PROP_UINT32("fdp.nrg", NvmeSubsystem, params.fdp.nrg, 1),
225     DEFINE_PROP_UINT16("fdp.nruh", NvmeSubsystem, params.fdp.nruh, 0),
226     DEFINE_PROP_END_OF_LIST(),
227 };
228 
229 static void nvme_subsys_class_init(ObjectClass *oc, void *data)
230 {
231     DeviceClass *dc = DEVICE_CLASS(oc);
232 
233     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
234 
235     dc->realize = nvme_subsys_realize;
236     dc->desc = "Virtual NVMe subsystem";
237     dc->hotpluggable = false;
238 
239     device_class_set_props(dc, nvme_subsystem_props);
240 }
241 
242 static const TypeInfo nvme_subsys_info = {
243     .name = TYPE_NVME_SUBSYS,
244     .parent = TYPE_DEVICE,
245     .class_init = nvme_subsys_class_init,
246     .instance_size = sizeof(NvmeSubsystem),
247 };
248 
249 static void nvme_subsys_register_types(void)
250 {
251     type_register_static(&nvme_subsys_info);
252 }
253 
254 type_init(nvme_subsys_register_types)
255