xref: /openbmc/qemu/hw/s390x/sclp.c (revision ac12b601) 
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 "hw/boards.h"
19 #include "hw/s390x/sclp.h"
20 #include "hw/s390x/event-facility.h"
21 #include "hw/s390x/s390-pci-bus.h"
22 #include "hw/s390x/ipl.h"
23 
24 static inline SCLPDevice *get_sclp_device(void)
25 {
26     static SCLPDevice *sclp;
27 
28     if (!sclp) {
29         sclp = SCLP(object_resolve_path_type("", TYPE_SCLP, NULL));
30     }
31     return sclp;
32 }
33 
34 static inline bool sclp_command_code_valid(uint32_t code)
35 {
36     switch (code & SCLP_CMD_CODE_MASK) {
37     case SCLP_CMDW_READ_SCP_INFO:
38     case SCLP_CMDW_READ_SCP_INFO_FORCED:
39     case SCLP_CMDW_READ_CPU_INFO:
40     case SCLP_CMDW_CONFIGURE_IOA:
41     case SCLP_CMDW_DECONFIGURE_IOA:
42     case SCLP_CMD_READ_EVENT_DATA:
43     case SCLP_CMD_WRITE_EVENT_DATA:
44     case SCLP_CMD_WRITE_EVENT_MASK:
45         return true;
46     }
47     return false;
48 }
49 
50 static bool sccb_verify_boundary(uint64_t sccb_addr, uint16_t sccb_len,
51                                  uint32_t code)
52 {
53     uint64_t sccb_max_addr = sccb_addr + sccb_len - 1;
54     uint64_t sccb_boundary = (sccb_addr & PAGE_MASK) + PAGE_SIZE;
55 
56     switch (code & SCLP_CMD_CODE_MASK) {
57     case SCLP_CMDW_READ_SCP_INFO:
58     case SCLP_CMDW_READ_SCP_INFO_FORCED:
59     case SCLP_CMDW_READ_CPU_INFO:
60         /*
61          * An extended-length SCCB is only allowed for Read SCP/CPU Info and
62          * is allowed to exceed the 4k boundary. The respective commands will
63          * set the length field to the required length if an insufficient
64          * SCCB length is provided.
65          */
66         if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB)) {
67             return true;
68         }
69         /* fallthrough */
70     default:
71         if (sccb_max_addr < sccb_boundary) {
72             return true;
73         }
74     }
75 
76     return false;
77 }
78 
79 static void prepare_cpu_entries(MachineState *ms, CPUEntry *entry, int *count)
80 {
81     uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 };
82     int i;
83 
84     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CPU, features);
85     for (i = 0, *count = 0; i < ms->possible_cpus->len; i++) {
86         if (!ms->possible_cpus->cpus[i].cpu) {
87             continue;
88         }
89         entry[*count].address = ms->possible_cpus->cpus[i].arch_id;
90         entry[*count].type = 0;
91         memcpy(entry[*count].features, features, sizeof(features));
92         (*count)++;
93     }
94 }
95 
96 #define SCCB_REQ_LEN(s, max_cpus) (sizeof(s) + max_cpus * sizeof(CPUEntry))
97 
98 static inline bool ext_len_sccb_supported(SCCBHeader header)
99 {
100     return s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB) &&
101            header.control_mask[2] & SCLP_VARIABLE_LENGTH_RESPONSE;
102 }
103 
104 /* Provide information about the configuration, CPUs and storage */
105 static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
106 {
107     ReadInfo *read_info = (ReadInfo *) sccb;
108     MachineState *machine = MACHINE(qdev_get_machine());
109     int cpu_count;
110     int rnsize, rnmax;
111     IplParameterBlock *ipib = s390_ipl_get_iplb();
112     int required_len = SCCB_REQ_LEN(ReadInfo, machine->possible_cpus->len);
113     int offset_cpu = s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB) ?
114                      offsetof(ReadInfo, entries) :
115                      SCLP_READ_SCP_INFO_FIXED_CPU_OFFSET;
116     CPUEntry *entries_start = (void *)sccb + offset_cpu;
117 
118     if (be16_to_cpu(sccb->h.length) < required_len) {
119         if (ext_len_sccb_supported(sccb->h)) {
120             sccb->h.length = cpu_to_be16(required_len);
121         }
122         sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
123         return;
124     }
125 
126     /* CPU information */
127     prepare_cpu_entries(machine, entries_start, &cpu_count);
128     read_info->entries_cpu = cpu_to_be16(cpu_count);
129     read_info->offset_cpu = cpu_to_be16(offset_cpu);
130     read_info->highest_cpu = cpu_to_be16(machine->smp.max_cpus - 1);
131 
132     read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
133 
134     /* Configuration Characteristic (Extension) */
135     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR,
136                          read_info->conf_char);
137     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT,
138                          read_info->conf_char_ext);
139 
140     if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB)) {
141         s390_get_feat_block(S390_FEAT_TYPE_SCLP_FAC134,
142                             &read_info->fac134);
143     }
144 
145     read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
146                                         SCLP_HAS_IOA_RECONFIG);
147 
148     read_info->mha_pow = s390_get_mha_pow();
149     read_info->hmfai = cpu_to_be32(s390_get_hmfai());
150 
151     rnsize = 1 << (sclp->increment_size - 20);
152     if (rnsize <= 128) {
153         read_info->rnsize = rnsize;
154     } else {
155         read_info->rnsize = 0;
156         read_info->rnsize2 = cpu_to_be32(rnsize);
157     }
158 
159     /* we don't support standby memory, maxram_size is never exposed */
160     rnmax = machine->ram_size >> sclp->increment_size;
161     if (rnmax < 0x10000) {
162         read_info->rnmax = cpu_to_be16(rnmax);
163     } else {
164         read_info->rnmax = cpu_to_be16(0);
165         read_info->rnmax2 = cpu_to_be64(rnmax);
166     }
167 
168     if (ipib && ipib->flags & DIAG308_FLAGS_LP_VALID) {
169         memcpy(&read_info->loadparm, &ipib->loadparm,
170                sizeof(read_info->loadparm));
171     } else {
172         s390_ipl_set_loadparm(read_info->loadparm);
173     }
174 
175     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
176 }
177 
178 /* Provide information about the CPU */
179 static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb)
180 {
181     MachineState *machine = MACHINE(qdev_get_machine());
182     ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
183     int cpu_count;
184     int required_len = SCCB_REQ_LEN(ReadCpuInfo, machine->possible_cpus->len);
185 
186     if (be16_to_cpu(sccb->h.length) < required_len) {
187         if (ext_len_sccb_supported(sccb->h)) {
188             sccb->h.length = cpu_to_be16(required_len);
189         }
190         sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
191         return;
192     }
193 
194     prepare_cpu_entries(machine, cpu_info->entries, &cpu_count);
195     cpu_info->nr_configured = cpu_to_be16(cpu_count);
196     cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
197     cpu_info->nr_standby = cpu_to_be16(0);
198 
199     /* The standby offset is 16-byte for each CPU */
200     cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
201         + cpu_info->nr_configured*sizeof(CPUEntry));
202 
203 
204     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
205 }
206 
207 static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb,
208                                       bool configure)
209 {
210     int rc;
211 
212     if (be16_to_cpu(sccb->h.length) < 16) {
213         rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH;
214         goto out_err;
215     }
216 
217     switch (((IoaCfgSccb *)sccb)->atype) {
218     case SCLP_RECONFIG_PCI_ATYPE:
219         if (s390_has_feat(S390_FEAT_ZPCI)) {
220             if (configure) {
221                 s390_pci_sclp_configure(sccb);
222             } else {
223                 s390_pci_sclp_deconfigure(sccb);
224             }
225             return;
226         }
227         /* fallthrough */
228     default:
229         rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED;
230     }
231 
232  out_err:
233     sccb->h.response_code = cpu_to_be16(rc);
234 }
235 
236 static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code)
237 {
238     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
239     SCLPEventFacility *ef = sclp->event_facility;
240     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
241 
242     switch (code & SCLP_CMD_CODE_MASK) {
243     case SCLP_CMDW_READ_SCP_INFO:
244     case SCLP_CMDW_READ_SCP_INFO_FORCED:
245         sclp_c->read_SCP_info(sclp, sccb);
246         break;
247     case SCLP_CMDW_READ_CPU_INFO:
248         sclp_c->read_cpu_info(sclp, sccb);
249         break;
250     case SCLP_CMDW_CONFIGURE_IOA:
251         sclp_configure_io_adapter(sclp, sccb, true);
252         break;
253     case SCLP_CMDW_DECONFIGURE_IOA:
254         sclp_configure_io_adapter(sclp, sccb, false);
255         break;
256     default:
257         efc->command_handler(ef, sccb, code);
258         break;
259     }
260 }
261 
262 /*
263  * We only need the address to have something valid for the
264  * service_interrupt call.
265  */
266 #define SCLP_PV_DUMMY_ADDR 0x4000
267 int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb,
268                                 uint32_t code)
269 {
270     SCLPDevice *sclp = get_sclp_device();
271     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
272     SCCBHeader header;
273     g_autofree SCCB *work_sccb = NULL;
274 
275     s390_cpu_pv_mem_read(env_archcpu(env), 0, &header, sizeof(SCCBHeader));
276 
277     work_sccb = g_malloc0(be16_to_cpu(header.length));
278     s390_cpu_pv_mem_read(env_archcpu(env), 0, work_sccb,
279                          be16_to_cpu(header.length));
280 
281     if (!sclp_command_code_valid(code)) {
282         work_sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
283         goto out_write;
284     }
285 
286     sclp_c->execute(sclp, work_sccb, code);
287 out_write:
288     s390_cpu_pv_mem_write(env_archcpu(env), 0, work_sccb,
289                           be16_to_cpu(work_sccb->h.length));
290     sclp_c->service_interrupt(sclp, SCLP_PV_DUMMY_ADDR);
291     return 0;
292 }
293 
294 int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
295 {
296     SCLPDevice *sclp = get_sclp_device();
297     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
298     SCCBHeader header;
299     g_autofree SCCB *work_sccb = NULL;
300 
301     /* first some basic checks on program checks */
302     if (env->psw.mask & PSW_MASK_PSTATE) {
303         return -PGM_PRIVILEGED;
304     }
305     if (cpu_physical_memory_is_io(sccb)) {
306         return -PGM_ADDRESSING;
307     }
308     if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa
309         || (sccb & ~0x7ffffff8UL) != 0) {
310         return -PGM_SPECIFICATION;
311     }
312 
313     /* the header contains the actual length of the sccb */
314     cpu_physical_memory_read(sccb, &header, sizeof(SCCBHeader));
315 
316     /* Valid sccb sizes */
317     if (be16_to_cpu(header.length) < sizeof(SCCBHeader)) {
318         return -PGM_SPECIFICATION;
319     }
320 
321     /*
322      * we want to work on a private copy of the sccb, to prevent guests
323      * from playing dirty tricks by modifying the memory content after
324      * the host has checked the values
325      */
326     work_sccb = g_malloc0(be16_to_cpu(header.length));
327     cpu_physical_memory_read(sccb, work_sccb, be16_to_cpu(header.length));
328 
329     if (!sclp_command_code_valid(code)) {
330         work_sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
331         goto out_write;
332     }
333 
334     if (!sccb_verify_boundary(sccb, be16_to_cpu(work_sccb->h.length), code)) {
335         work_sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
336         goto out_write;
337     }
338 
339     sclp_c->execute(sclp, work_sccb, code);
340 out_write:
341     cpu_physical_memory_write(sccb, work_sccb,
342                               be16_to_cpu(work_sccb->h.length));
343 
344     sclp_c->service_interrupt(sclp, sccb);
345 
346     return 0;
347 }
348 
349 static void service_interrupt(SCLPDevice *sclp, uint32_t sccb)
350 {
351     SCLPEventFacility *ef = sclp->event_facility;
352     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
353 
354     uint32_t param = sccb & ~3;
355 
356     /* Indicate whether an event is still pending */
357     param |= efc->event_pending(ef) ? 1 : 0;
358 
359     if (!param) {
360         /* No need to send an interrupt, there's nothing to be notified about */
361         return;
362     }
363     s390_sclp_extint(param);
364 }
365 
366 void sclp_service_interrupt(uint32_t sccb)
367 {
368     SCLPDevice *sclp = get_sclp_device();
369     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
370 
371     sclp_c->service_interrupt(sclp, sccb);
372 }
373 
374 /* qemu object creation and initialization functions */
375 
376 void s390_sclp_init(void)
377 {
378     Object *new = object_new(TYPE_SCLP);
379 
380     object_property_add_child(qdev_get_machine(), TYPE_SCLP, new);
381     object_unref(new);
382     qdev_realize(DEVICE(new), NULL, &error_fatal);
383 }
384 
385 static void sclp_realize(DeviceState *dev, Error **errp)
386 {
387     MachineState *machine = MACHINE(qdev_get_machine());
388     SCLPDevice *sclp = SCLP(dev);
389     uint64_t hw_limit;
390     int ret;
391 
392     /*
393      * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
394      * as we can't find a fitting bus via the qom tree, we have to add the
395      * event facility to the sysbus, so e.g. a sclp console can be created.
396      */
397     if (!sysbus_realize(SYS_BUS_DEVICE(sclp->event_facility), errp)) {
398         return;
399     }
400 
401     ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
402     if (ret == -E2BIG) {
403         error_setg(errp, "host supports a maximum of %" PRIu64 " GB",
404                    hw_limit / GiB);
405     } else if (ret) {
406         error_setg(errp, "setting the guest size failed");
407     }
408 }
409 
410 static void sclp_memory_init(SCLPDevice *sclp)
411 {
412     MachineState *machine = MACHINE(qdev_get_machine());
413     MachineClass *machine_class = MACHINE_GET_CLASS(qdev_get_machine());
414     ram_addr_t initial_mem = machine->ram_size;
415     int increment_size = 20;
416 
417     /* The storage increment size is a multiple of 1M and is a power of 2.
418      * For some machine types, the number of storage increments must be
419      * MAX_STORAGE_INCREMENTS or fewer.
420      * The variable 'increment_size' is an exponent of 2 that can be
421      * used to calculate the size (in bytes) of an increment. */
422     while (machine_class->fixup_ram_size != NULL &&
423            (initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) {
424         increment_size++;
425     }
426     sclp->increment_size = increment_size;
427 }
428 
429 static void sclp_init(Object *obj)
430 {
431     SCLPDevice *sclp = SCLP(obj);
432     Object *new;
433 
434     new = object_new(TYPE_SCLP_EVENT_FACILITY);
435     object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new);
436     object_unref(new);
437     sclp->event_facility = EVENT_FACILITY(new);
438 
439     sclp_memory_init(sclp);
440 }
441 
442 static void sclp_class_init(ObjectClass *oc, void *data)
443 {
444     SCLPDeviceClass *sc = SCLP_CLASS(oc);
445     DeviceClass *dc = DEVICE_CLASS(oc);
446 
447     dc->desc = "SCLP (Service-Call Logical Processor)";
448     dc->realize = sclp_realize;
449     dc->hotpluggable = false;
450     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
451     /*
452      * Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init
453      * which is a non-pluggable sysbus device
454      */
455     dc->user_creatable = false;
456 
457     sc->read_SCP_info = read_SCP_info;
458     sc->read_cpu_info = sclp_read_cpu_info;
459     sc->execute = sclp_execute;
460     sc->service_interrupt = service_interrupt;
461 }
462 
463 static TypeInfo sclp_info = {
464     .name = TYPE_SCLP,
465     .parent = TYPE_DEVICE,
466     .instance_init = sclp_init,
467     .instance_size = sizeof(SCLPDevice),
468     .class_init = sclp_class_init,
469     .class_size = sizeof(SCLPDeviceClass),
470 };
471 
472 static void register_types(void)
473 {
474     type_register_static(&sclp_info);
475 }
476 type_init(register_types);
477