1/*
2 * SCLP Support
3 *
4 * Copyright IBM, Corp. 2012
5 *
6 * Authors:
7 * Christian Borntraeger <borntraeger@de.ibm.com>
8 * Heinz Graalfs <graalfs@linux.vnet.ibm.com>
9 *
10 * This work is licensed under the terms of the GNU GPL, version 2 or (at your
11 * option) any later version. See the COPYING file in the top-level directory.
12 *
13 */
14
15#include "qemu/osdep.h"
16#include "qemu/units.h"
17#include "qapi/error.h"
18#include "cpu.h"
19#include "sysemu/sysemu.h"
20#include "hw/boards.h"
21#include "hw/s390x/sclp.h"
22#include "hw/s390x/event-facility.h"
23#include "hw/s390x/s390-pci-bus.h"
24#include "hw/s390x/ipl.h"
25
26static inline SCLPDevice *get_sclp_device(void)
27{
28 static SCLPDevice *sclp;
29
30 if (!sclp) {
31 sclp = SCLP(object_resolve_path_type("", TYPE_SCLP, NULL));
32 }
33 return sclp;
34}
35
36static void prepare_cpu_entries(SCLPDevice *sclp, CPUEntry *entry, int *count)
37{
38 MachineState *ms = MACHINE(qdev_get_machine());
39 uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 };
40 int i;
41
42 s390_get_feat_block(S390_FEAT_TYPE_SCLP_CPU, features);
43 for (i = 0, *count = 0; i < ms->possible_cpus->len; i++) {
44 if (!ms->possible_cpus->cpus[i].cpu) {
45 continue;
46 }
47 entry[*count].address = ms->possible_cpus->cpus[i].arch_id;
48 entry[*count].type = 0;
49 memcpy(entry[*count].features, features, sizeof(features));
50 (*count)++;
51 }
52}
53
54/* Provide information about the configuration, CPUs and storage */
55static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
56{
57 ReadInfo *read_info = (ReadInfo *) sccb;
58 MachineState *machine = MACHINE(qdev_get_machine());
59 int cpu_count;
60 int rnsize, rnmax;
61 IplParameterBlock *ipib = s390_ipl_get_iplb();
62
63 /* CPU information */
64 prepare_cpu_entries(sclp, read_info->entries, &cpu_count);
65 read_info->entries_cpu = cpu_to_be16(cpu_count);
66 read_info->offset_cpu = cpu_to_be16(offsetof(ReadInfo, entries));
67 read_info->highest_cpu = cpu_to_be16(machine->smp.max_cpus - 1);
68
69 read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
70
71 /* Configuration Characteristic (Extension) */
72 s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR,
73 read_info->conf_char);
74 s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT,
75 read_info->conf_char_ext);
76
77 read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
78 SCLP_HAS_IOA_RECONFIG);
79
80 read_info->mha_pow = s390_get_mha_pow();
81 read_info->hmfai = cpu_to_be32(s390_get_hmfai());
82
83 rnsize = 1 << (sclp->increment_size - 20);
84 if (rnsize <= 128) {
85 read_info->rnsize = rnsize;
86 } else {
87 read_info->rnsize = 0;
88 read_info->rnsize2 = cpu_to_be32(rnsize);
89 }
90
91 /* we don't support standby memory, maxram_size is never exposed */
92 rnmax = machine->ram_size >> sclp->increment_size;
93 if (rnmax < 0x10000) {
94 read_info->rnmax = cpu_to_be16(rnmax);
95 } else {
96 read_info->rnmax = cpu_to_be16(0);
97 read_info->rnmax2 = cpu_to_be64(rnmax);
98 }
99
100 if (ipib && ipib->flags & DIAG308_FLAGS_LP_VALID) {
101 memcpy(&read_info->loadparm, &ipib->loadparm,
102 sizeof(read_info->loadparm));
103 } else {
104 s390_ipl_set_loadparm(read_info->loadparm);
105 }
106
107 sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
108}
109
110/* Provide information about the CPU */
111static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb)
112{
113 ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
114 int cpu_count;
115
116 prepare_cpu_entries(sclp, cpu_info->entries, &cpu_count);
117 cpu_info->nr_configured = cpu_to_be16(cpu_count);
118 cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
119 cpu_info->nr_standby = cpu_to_be16(0);
120
121 /* The standby offset is 16-byte for each CPU */
122 cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
123 + cpu_info->nr_configured*sizeof(CPUEntry));
124
125
126 sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
127}
128
129static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb,
130 bool configure)
131{
132 int rc;
133
134 if (be16_to_cpu(sccb->h.length) < 16) {
135 rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH;
136 goto out_err;
137 }
138
139 switch (((IoaCfgSccb *)sccb)->atype) {
140 case SCLP_RECONFIG_PCI_ATYPE:
141 if (s390_has_feat(S390_FEAT_ZPCI)) {
142 if (configure) {
143 s390_pci_sclp_configure(sccb);
144 } else {
145 s390_pci_sclp_deconfigure(sccb);
146 }
147 return;
148 }
149 /* fallthrough */
150 default:
151 rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED;
152 }
153
154 out_err:
155 sccb->h.response_code = cpu_to_be16(rc);
156}
157
158static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code)
159{
160 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
161 SCLPEventFacility *ef = sclp->event_facility;
162 SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
163
164 switch (code & SCLP_CMD_CODE_MASK) {
165 case SCLP_CMDW_READ_SCP_INFO:
166 case SCLP_CMDW_READ_SCP_INFO_FORCED:
167 sclp_c->read_SCP_info(sclp, sccb);
168 break;
169 case SCLP_CMDW_READ_CPU_INFO:
170 sclp_c->read_cpu_info(sclp, sccb);
171 break;
172 case SCLP_CMDW_CONFIGURE_IOA:
173 sclp_configure_io_adapter(sclp, sccb, true);
174 break;
175 case SCLP_CMDW_DECONFIGURE_IOA:
176 sclp_configure_io_adapter(sclp, sccb, false);
177 break;
178 default:
179 efc->command_handler(ef, sccb, code);
180 break;
181 }
182}
183
184int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
185{
186 SCLPDevice *sclp = get_sclp_device();
187 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
188 int r = 0;
189 SCCB work_sccb;
190
191 hwaddr sccb_len = sizeof(SCCB);
192
193 /* first some basic checks on program checks */
194 if (env->psw.mask & PSW_MASK_PSTATE) {
195 r = -PGM_PRIVILEGED;
196 goto out;
197 }
198 if (cpu_physical_memory_is_io(sccb)) {
199 r = -PGM_ADDRESSING;
200 goto out;
201 }
202 if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa
203 || (sccb & ~0x7ffffff8UL) != 0) {
204 r = -PGM_SPECIFICATION;
205 goto out;
206 }
207
208 /*
209 * we want to work on a private copy of the sccb, to prevent guests
210 * from playing dirty tricks by modifying the memory content after
211 * the host has checked the values
212 */
213 cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
214
215 /* Valid sccb sizes */
216 if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) ||
217 be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) {
218 r = -PGM_SPECIFICATION;
219 goto out;
220 }
221
222 sclp_c->execute(sclp, &work_sccb, code);
223
224 cpu_physical_memory_write(sccb, &work_sccb,
225 be16_to_cpu(work_sccb.h.length));
226
227 sclp_c->service_interrupt(sclp, sccb);
228
229out:
230 return r;
231}
232
233static void service_interrupt(SCLPDevice *sclp, uint32_t sccb)
234{
235 SCLPEventFacility *ef = sclp->event_facility;
236 SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
237
238 uint32_t param = sccb & ~3;
239
240 /* Indicate whether an event is still pending */
241 param |= efc->event_pending(ef) ? 1 : 0;
242
243 if (!param) {
244 /* No need to send an interrupt, there's nothing to be notified about */
245 return;
246 }
247 s390_sclp_extint(param);
248}
249
250void sclp_service_interrupt(uint32_t sccb)
251{
252 SCLPDevice *sclp = get_sclp_device();
253 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
254
255 sclp_c->service_interrupt(sclp, sccb);
256}
257
258/* qemu object creation and initialization functions */
259
260void s390_sclp_init(void)
261{
262 Object *new = object_new(TYPE_SCLP);
263
264 object_property_add_child(qdev_get_machine(), TYPE_SCLP, new,
265 NULL);
266 object_unref(OBJECT(new));
267 qdev_init_nofail(DEVICE(new));
268}
269
270static void sclp_realize(DeviceState *dev, Error **errp)
271{
272 MachineState *machine = MACHINE(qdev_get_machine());
273 SCLPDevice *sclp = SCLP(dev);
274 Error *err = NULL;
275 uint64_t hw_limit;
276 int ret;
277
278 object_property_set_bool(OBJECT(sclp->event_facility), true, "realized",
279 &err);
280 if (err) {
281 goto out;
282 }
283 /*
284 * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
285 * as we can't find a fitting bus via the qom tree, we have to add the
286 * event facility to the sysbus, so e.g. a sclp console can be created.
287 */
288 qdev_set_parent_bus(DEVICE(sclp->event_facility), sysbus_get_default());
289
290 ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
291 if (ret == -E2BIG) {
292 error_setg(&err, "host supports a maximum of %" PRIu64 " GB",
293 hw_limit / GiB);
294 } else if (ret) {
295 error_setg(&err, "setting the guest size failed");
296 }
297
298out:
299 error_propagate(errp, err);
300}
301
302static void sclp_memory_init(SCLPDevice *sclp)
303{
304 MachineState *machine = MACHINE(qdev_get_machine());
305 ram_addr_t initial_mem = machine->ram_size;
306 int increment_size = 20;
307
308 /* The storage increment size is a multiple of 1M and is a power of 2.
309 * The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer.
310 * The variable 'increment_size' is an exponent of 2 that can be
311 * used to calculate the size (in bytes) of an increment. */
312 while ((initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) {
313 increment_size++;
314 }
315 sclp->increment_size = increment_size;
316
317 /* The core memory area needs to be aligned with the increment size.
318 * In effect, this can cause the user-specified memory size to be rounded
319 * down to align with the nearest increment boundary. */
320 initial_mem = initial_mem >> increment_size << increment_size;
321
322 machine->ram_size = initial_mem;
323 machine->maxram_size = initial_mem;
324 /* let's propagate the changed ram size into the global variable. */
325 ram_size = initial_mem;
326}
327
328static void sclp_init(Object *obj)
329{
330 SCLPDevice *sclp = SCLP(obj);
331 Object *new;
332
333 new = object_new(TYPE_SCLP_EVENT_FACILITY);
334 object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new, NULL);
335 object_unref(new);
336 sclp->event_facility = EVENT_FACILITY(new);
337
338 sclp_memory_init(sclp);
339}
340
341static void sclp_class_init(ObjectClass *oc, void *data)
342{
343 SCLPDeviceClass *sc = SCLP_CLASS(oc);
344 DeviceClass *dc = DEVICE_CLASS(oc);
345
346 dc->desc = "SCLP (Service-Call Logical Processor)";
347 dc->realize = sclp_realize;
348 dc->hotpluggable = false;
349 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
350 /*
351 * Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init
352 * which is a non-pluggable sysbus device
353 */
354 dc->user_creatable = false;
355
356 sc->read_SCP_info = read_SCP_info;
357 sc->read_cpu_info = sclp_read_cpu_info;
358 sc->execute = sclp_execute;
359 sc->service_interrupt = service_interrupt;
360}
361
362static TypeInfo sclp_info = {
363 .name = TYPE_SCLP,
364 .parent = TYPE_DEVICE,
365 .instance_init = sclp_init,
366 .instance_size = sizeof(SCLPDevice),
367 .class_init = sclp_class_init,
368 .class_size = sizeof(SCLPDeviceClass),
369};
370
371static void register_types(void)
372{
373 type_register_static(&sclp_info);
374}
375type_init(register_types);
376