xref: /openbmc/qemu/hw/s390x/sclp.c (revision 284d697c) 
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 
26 static 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 
36 static inline bool sclp_command_code_valid(uint32_t code)
37 {
38     switch (code & SCLP_CMD_CODE_MASK) {
39     case SCLP_CMDW_READ_SCP_INFO:
40     case SCLP_CMDW_READ_SCP_INFO_FORCED:
41     case SCLP_CMDW_READ_CPU_INFO:
42     case SCLP_CMDW_CONFIGURE_IOA:
43     case SCLP_CMDW_DECONFIGURE_IOA:
44     case SCLP_CMD_READ_EVENT_DATA:
45     case SCLP_CMD_WRITE_EVENT_DATA:
46     case SCLP_CMD_WRITE_EVENT_MASK:
47         return true;
48     }
49     return false;
50 }
51 
52 static bool sccb_verify_boundary(uint64_t sccb_addr, uint16_t sccb_len,
53                                  uint32_t code)
54 {
55     uint64_t sccb_max_addr = sccb_addr + sccb_len - 1;
56     uint64_t sccb_boundary = (sccb_addr & PAGE_MASK) + PAGE_SIZE;
57 
58     switch (code & SCLP_CMD_CODE_MASK) {
59     case SCLP_CMDW_READ_SCP_INFO:
60     case SCLP_CMDW_READ_SCP_INFO_FORCED:
61     case SCLP_CMDW_READ_CPU_INFO:
62         /*
63          * An extended-length SCCB is only allowed for Read SCP/CPU Info and
64          * is allowed to exceed the 4k boundary. The respective commands will
65          * set the length field to the required length if an insufficient
66          * SCCB length is provided.
67          */
68         if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB)) {
69             return true;
70         }
71         /* fallthrough */
72     default:
73         if (sccb_max_addr < sccb_boundary) {
74             return true;
75         }
76     }
77 
78     return false;
79 }
80 
81 static void prepare_cpu_entries(MachineState *ms, CPUEntry *entry, int *count)
82 {
83     uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 };
84     int i;
85 
86     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CPU, features);
87     for (i = 0, *count = 0; i < ms->possible_cpus->len; i++) {
88         if (!ms->possible_cpus->cpus[i].cpu) {
89             continue;
90         }
91         entry[*count].address = ms->possible_cpus->cpus[i].arch_id;
92         entry[*count].type = 0;
93         memcpy(entry[*count].features, features, sizeof(features));
94         (*count)++;
95     }
96 }
97 
98 #define SCCB_REQ_LEN(s, max_cpus) (sizeof(s) + max_cpus * sizeof(CPUEntry))
99 
100 static inline bool ext_len_sccb_supported(SCCBHeader header)
101 {
102     return s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB) &&
103            header.control_mask[2] & SCLP_VARIABLE_LENGTH_RESPONSE;
104 }
105 
106 /* Provide information about the configuration, CPUs and storage */
107 static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
108 {
109     ReadInfo *read_info = (ReadInfo *) sccb;
110     MachineState *machine = MACHINE(qdev_get_machine());
111     int cpu_count;
112     int rnsize, rnmax;
113     IplParameterBlock *ipib = s390_ipl_get_iplb();
114     int required_len = SCCB_REQ_LEN(ReadInfo, machine->possible_cpus->len);
115     int offset_cpu = s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB) ?
116                      offsetof(ReadInfo, entries) :
117                      SCLP_READ_SCP_INFO_FIXED_CPU_OFFSET;
118     CPUEntry *entries_start = (void *)sccb + offset_cpu;
119 
120     if (be16_to_cpu(sccb->h.length) < required_len) {
121         if (ext_len_sccb_supported(sccb->h)) {
122             sccb->h.length = cpu_to_be16(required_len);
123         }
124         sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
125         return;
126     }
127 
128     /* CPU information */
129     prepare_cpu_entries(machine, entries_start, &cpu_count);
130     read_info->entries_cpu = cpu_to_be16(cpu_count);
131     read_info->offset_cpu = cpu_to_be16(offset_cpu);
132     read_info->highest_cpu = cpu_to_be16(machine->smp.max_cpus - 1);
133 
134     read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
135 
136     /* Configuration Characteristic (Extension) */
137     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR,
138                          read_info->conf_char);
139     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT,
140                          read_info->conf_char_ext);
141 
142     if (s390_has_feat(S390_FEAT_EXTENDED_LENGTH_SCCB)) {
143         s390_get_feat_block(S390_FEAT_TYPE_SCLP_FAC134,
144                             &read_info->fac134);
145     }
146 
147     read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
148                                         SCLP_HAS_IOA_RECONFIG);
149 
150     read_info->mha_pow = s390_get_mha_pow();
151     read_info->hmfai = cpu_to_be32(s390_get_hmfai());
152 
153     rnsize = 1 << (sclp->increment_size - 20);
154     if (rnsize <= 128) {
155         read_info->rnsize = rnsize;
156     } else {
157         read_info->rnsize = 0;
158         read_info->rnsize2 = cpu_to_be32(rnsize);
159     }
160 
161     /* we don't support standby memory, maxram_size is never exposed */
162     rnmax = machine->ram_size >> sclp->increment_size;
163     if (rnmax < 0x10000) {
164         read_info->rnmax = cpu_to_be16(rnmax);
165     } else {
166         read_info->rnmax = cpu_to_be16(0);
167         read_info->rnmax2 = cpu_to_be64(rnmax);
168     }
169 
170     if (ipib && ipib->flags & DIAG308_FLAGS_LP_VALID) {
171         memcpy(&read_info->loadparm, &ipib->loadparm,
172                sizeof(read_info->loadparm));
173     } else {
174         s390_ipl_set_loadparm(read_info->loadparm);
175     }
176 
177     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
178 }
179 
180 /* Provide information about the CPU */
181 static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb)
182 {
183     MachineState *machine = MACHINE(qdev_get_machine());
184     ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
185     int cpu_count;
186     int required_len = SCCB_REQ_LEN(ReadCpuInfo, machine->possible_cpus->len);
187 
188     if (be16_to_cpu(sccb->h.length) < required_len) {
189         if (ext_len_sccb_supported(sccb->h)) {
190             sccb->h.length = cpu_to_be16(required_len);
191         }
192         sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
193         return;
194     }
195 
196     prepare_cpu_entries(machine, cpu_info->entries, &cpu_count);
197     cpu_info->nr_configured = cpu_to_be16(cpu_count);
198     cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
199     cpu_info->nr_standby = cpu_to_be16(0);
200 
201     /* The standby offset is 16-byte for each CPU */
202     cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
203         + cpu_info->nr_configured*sizeof(CPUEntry));
204 
205 
206     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
207 }
208 
209 static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb,
210                                       bool configure)
211 {
212     int rc;
213 
214     if (be16_to_cpu(sccb->h.length) < 16) {
215         rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH;
216         goto out_err;
217     }
218 
219     switch (((IoaCfgSccb *)sccb)->atype) {
220     case SCLP_RECONFIG_PCI_ATYPE:
221         if (s390_has_feat(S390_FEAT_ZPCI)) {
222             if (configure) {
223                 s390_pci_sclp_configure(sccb);
224             } else {
225                 s390_pci_sclp_deconfigure(sccb);
226             }
227             return;
228         }
229         /* fallthrough */
230     default:
231         rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED;
232     }
233 
234  out_err:
235     sccb->h.response_code = cpu_to_be16(rc);
236 }
237 
238 static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code)
239 {
240     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
241     SCLPEventFacility *ef = sclp->event_facility;
242     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
243 
244     switch (code & SCLP_CMD_CODE_MASK) {
245     case SCLP_CMDW_READ_SCP_INFO:
246     case SCLP_CMDW_READ_SCP_INFO_FORCED:
247         sclp_c->read_SCP_info(sclp, sccb);
248         break;
249     case SCLP_CMDW_READ_CPU_INFO:
250         sclp_c->read_cpu_info(sclp, sccb);
251         break;
252     case SCLP_CMDW_CONFIGURE_IOA:
253         sclp_configure_io_adapter(sclp, sccb, true);
254         break;
255     case SCLP_CMDW_DECONFIGURE_IOA:
256         sclp_configure_io_adapter(sclp, sccb, false);
257         break;
258     default:
259         efc->command_handler(ef, sccb, code);
260         break;
261     }
262 }
263 
264 /*
265  * We only need the address to have something valid for the
266  * service_interrupt call.
267  */
268 #define SCLP_PV_DUMMY_ADDR 0x4000
269 int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb,
270                                 uint32_t code)
271 {
272     SCLPDevice *sclp = get_sclp_device();
273     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
274     SCCBHeader header;
275     g_autofree SCCB *work_sccb = NULL;
276 
277     s390_cpu_pv_mem_read(env_archcpu(env), 0, &header, sizeof(SCCBHeader));
278 
279     work_sccb = g_malloc0(be16_to_cpu(header.length));
280     s390_cpu_pv_mem_read(env_archcpu(env), 0, work_sccb,
281                          be16_to_cpu(header.length));
282 
283     if (!sclp_command_code_valid(code)) {
284         work_sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
285         goto out_write;
286     }
287 
288     sclp_c->execute(sclp, work_sccb, code);
289 out_write:
290     s390_cpu_pv_mem_write(env_archcpu(env), 0, work_sccb,
291                           be16_to_cpu(work_sccb->h.length));
292     sclp_c->service_interrupt(sclp, SCLP_PV_DUMMY_ADDR);
293     return 0;
294 }
295 
296 int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
297 {
298     SCLPDevice *sclp = get_sclp_device();
299     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
300     SCCBHeader header;
301     g_autofree SCCB *work_sccb = NULL;
302 
303     /* first some basic checks on program checks */
304     if (env->psw.mask & PSW_MASK_PSTATE) {
305         return -PGM_PRIVILEGED;
306     }
307     if (cpu_physical_memory_is_io(sccb)) {
308         return -PGM_ADDRESSING;
309     }
310     if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa
311         || (sccb & ~0x7ffffff8UL) != 0) {
312         return -PGM_SPECIFICATION;
313     }
314 
315     /* the header contains the actual length of the sccb */
316     cpu_physical_memory_read(sccb, &header, sizeof(SCCBHeader));
317 
318     /* Valid sccb sizes */
319     if (be16_to_cpu(header.length) < sizeof(SCCBHeader)) {
320         return -PGM_SPECIFICATION;
321     }
322 
323     /*
324      * we want to work on a private copy of the sccb, to prevent guests
325      * from playing dirty tricks by modifying the memory content after
326      * the host has checked the values
327      */
328     work_sccb = g_malloc0(be16_to_cpu(header.length));
329     cpu_physical_memory_read(sccb, work_sccb, be16_to_cpu(header.length));
330 
331     if (!sclp_command_code_valid(code)) {
332         work_sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
333         goto out_write;
334     }
335 
336     if (!sccb_verify_boundary(sccb, be16_to_cpu(work_sccb->h.length), code)) {
337         work_sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
338         goto out_write;
339     }
340 
341     sclp_c->execute(sclp, work_sccb, code);
342 out_write:
343     cpu_physical_memory_write(sccb, work_sccb,
344                               be16_to_cpu(work_sccb->h.length));
345 
346     sclp_c->service_interrupt(sclp, sccb);
347 
348     return 0;
349 }
350 
351 static void service_interrupt(SCLPDevice *sclp, uint32_t sccb)
352 {
353     SCLPEventFacility *ef = sclp->event_facility;
354     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
355 
356     uint32_t param = sccb & ~3;
357 
358     /* Indicate whether an event is still pending */
359     param |= efc->event_pending(ef) ? 1 : 0;
360 
361     if (!param) {
362         /* No need to send an interrupt, there's nothing to be notified about */
363         return;
364     }
365     s390_sclp_extint(param);
366 }
367 
368 void sclp_service_interrupt(uint32_t sccb)
369 {
370     SCLPDevice *sclp = get_sclp_device();
371     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
372 
373     sclp_c->service_interrupt(sclp, sccb);
374 }
375 
376 /* qemu object creation and initialization functions */
377 
378 void s390_sclp_init(void)
379 {
380     Object *new = object_new(TYPE_SCLP);
381 
382     object_property_add_child(qdev_get_machine(), TYPE_SCLP, new);
383     object_unref(new);
384     qdev_realize(DEVICE(new), NULL, &error_fatal);
385 }
386 
387 static void sclp_realize(DeviceState *dev, Error **errp)
388 {
389     MachineState *machine = MACHINE(qdev_get_machine());
390     SCLPDevice *sclp = SCLP(dev);
391     uint64_t hw_limit;
392     int ret;
393 
394     /*
395      * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
396      * as we can't find a fitting bus via the qom tree, we have to add the
397      * event facility to the sysbus, so e.g. a sclp console can be created.
398      */
399     if (!sysbus_realize(SYS_BUS_DEVICE(sclp->event_facility), errp)) {
400         return;
401     }
402 
403     ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
404     if (ret == -E2BIG) {
405         error_setg(errp, "host supports a maximum of %" PRIu64 " GB",
406                    hw_limit / GiB);
407     } else if (ret) {
408         error_setg(errp, "setting the guest size failed");
409     }
410 }
411 
412 static void sclp_memory_init(SCLPDevice *sclp)
413 {
414     MachineState *machine = MACHINE(qdev_get_machine());
415     MachineClass *machine_class = MACHINE_GET_CLASS(qdev_get_machine());
416     ram_addr_t initial_mem = machine->ram_size;
417     int increment_size = 20;
418 
419     /* The storage increment size is a multiple of 1M and is a power of 2.
420      * For some machine types, the number of storage increments must be
421      * MAX_STORAGE_INCREMENTS or fewer.
422      * The variable 'increment_size' is an exponent of 2 that can be
423      * used to calculate the size (in bytes) of an increment. */
424     while (machine_class->fixup_ram_size != NULL &&
425            (initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) {
426         increment_size++;
427     }
428     sclp->increment_size = increment_size;
429 }
430 
431 static void sclp_init(Object *obj)
432 {
433     SCLPDevice *sclp = SCLP(obj);
434     Object *new;
435 
436     new = object_new(TYPE_SCLP_EVENT_FACILITY);
437     object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new);
438     object_unref(new);
439     sclp->event_facility = EVENT_FACILITY(new);
440 
441     sclp_memory_init(sclp);
442 }
443 
444 static void sclp_class_init(ObjectClass *oc, void *data)
445 {
446     SCLPDeviceClass *sc = SCLP_CLASS(oc);
447     DeviceClass *dc = DEVICE_CLASS(oc);
448 
449     dc->desc = "SCLP (Service-Call Logical Processor)";
450     dc->realize = sclp_realize;
451     dc->hotpluggable = false;
452     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
453     /*
454      * Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init
455      * which is a non-pluggable sysbus device
456      */
457     dc->user_creatable = false;
458 
459     sc->read_SCP_info = read_SCP_info;
460     sc->read_cpu_info = sclp_read_cpu_info;
461     sc->execute = sclp_execute;
462     sc->service_interrupt = service_interrupt;
463 }
464 
465 static TypeInfo sclp_info = {
466     .name = TYPE_SCLP,
467     .parent = TYPE_DEVICE,
468     .instance_init = sclp_init,
469     .instance_size = sizeof(SCLPDevice),
470     .class_init = sclp_class_init,
471     .class_size = sizeof(SCLPDeviceClass),
472 };
473 
474 static void register_types(void)
475 {
476     type_register_static(&sclp_info);
477 }
478 type_init(register_types);
479