aboutsummaryrefslogtreecommitdiff
path: root/hw/intc/s390_flic.c
blob: 74e02858d43e3596d669e0d1a26b2bc8e4c90f3c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
/*
 * QEMU S390x floating interrupt controller (flic)
 *
 * Copyright 2014 IBM Corp.
 * Author(s): Jens Freimann <jfrei@linux.vnet.ibm.com>
 *            Cornelia Huck <cornelia.huck@de.ibm.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or (at
 * your option) any later version. See the COPYING file in the top-level
 * directory.
 */

#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
#include "hw/sysbus.h"
#include "hw/s390x/ioinst.h"
#include "hw/s390x/s390_flic.h"
#include "hw/qdev-properties.h"
#include "hw/s390x/css.h"
#include "trace.h"
#include "qapi/error.h"
#include "hw/s390x/s390-virtio-ccw.h"

S390FLICStateClass *s390_get_flic_class(S390FLICState *fs)
{
    static S390FLICStateClass *class;

    if (!class) {
        /* we only have one flic device, so this is fine to cache */
        class = S390_FLIC_COMMON_GET_CLASS(fs);
    }
    return class;
}

QEMUS390FLICState *s390_get_qemu_flic(S390FLICState *fs)
{
    static QEMUS390FLICState *flic;

    if (!flic) {
        /* we only have one flic device, so this is fine to cache */
        flic = QEMU_S390_FLIC(fs);
    }
    return flic;
}

S390FLICState *s390_get_flic(void)
{
    static S390FLICState *fs;

    if (!fs) {
        fs = S390_FLIC_COMMON(object_resolve_path_type("",
                                                       TYPE_S390_FLIC_COMMON,
                                                       NULL));
    }
    return fs;
}

void s390_flic_init(void)
{
    DeviceState *dev;

    if (kvm_enabled()) {
        dev = qdev_new(TYPE_KVM_S390_FLIC);
        object_property_add_child(qdev_get_machine(), TYPE_KVM_S390_FLIC,
                                  OBJECT(dev));
    } else {
        dev = qdev_new(TYPE_QEMU_S390_FLIC);
        object_property_add_child(qdev_get_machine(), TYPE_QEMU_S390_FLIC,
                                  OBJECT(dev));
    }
    sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
}

static int qemu_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
                                         uint8_t isc, bool swap,
                                         bool is_maskable, uint8_t flags)
{
    /* nothing to do */
    return 0;
}

static int qemu_s390_io_adapter_map(S390FLICState *fs, uint32_t id,
                                    uint64_t map_addr, bool do_map)
{
    /* nothing to do */
    return 0;
}

static int qemu_s390_add_adapter_routes(S390FLICState *fs,
                                        AdapterRoutes *routes)
{
    return -ENOSYS;
}

static void qemu_s390_release_adapter_routes(S390FLICState *fs,
                                             AdapterRoutes *routes)
{
}

static int qemu_s390_clear_io_flic(S390FLICState *fs, uint16_t subchannel_id,
                           uint16_t subchannel_nr)
{
    QEMUS390FLICState *flic  = s390_get_qemu_flic(fs);
    QEMUS390FlicIO *cur, *next;
    uint8_t isc;

    g_assert(qemu_mutex_iothread_locked());
    if (!(flic->pending & FLIC_PENDING_IO)) {
        return 0;
    }

    /* check all iscs */
    for (isc = 0; isc < 8; isc++) {
        if (QLIST_EMPTY(&flic->io[isc])) {
            continue;
        }

        /* search and delete any matching one */
        QLIST_FOREACH_SAFE(cur, &flic->io[isc], next, next) {
            if (cur->id == subchannel_id && cur->nr == subchannel_nr) {
                QLIST_REMOVE(cur, next);
                g_free(cur);
            }
        }

        /* update our indicator bit */
        if (QLIST_EMPTY(&flic->io[isc])) {
            flic->pending &= ~ISC_TO_PENDING_IO(isc);
        }
    }
    return 0;
}

static int qemu_s390_modify_ais_mode(S390FLICState *fs, uint8_t isc,
                                     uint16_t mode)
{
    QEMUS390FLICState *flic  = s390_get_qemu_flic(fs);

    switch (mode) {
    case SIC_IRQ_MODE_ALL:
        flic->simm &= ~AIS_MODE_MASK(isc);
        flic->nimm &= ~AIS_MODE_MASK(isc);
        break;
    case SIC_IRQ_MODE_SINGLE:
        flic->simm |= AIS_MODE_MASK(isc);
        flic->nimm &= ~AIS_MODE_MASK(isc);
        break;
    default:
        return -EINVAL;
    }

    return 0;
}

static int qemu_s390_inject_airq(S390FLICState *fs, uint8_t type,
                                 uint8_t isc, uint8_t flags)
{
    QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
    S390FLICStateClass *fsc = s390_get_flic_class(fs);
    bool flag = flags & S390_ADAPTER_SUPPRESSIBLE;
    uint32_t io_int_word = (isc << 27) | IO_INT_WORD_AI;

    if (flag && (flic->nimm & AIS_MODE_MASK(isc))) {
        trace_qemu_s390_airq_suppressed(type, isc);
        return 0;
    }

    fsc->inject_io(fs, 0, 0, 0, io_int_word);

    if (flag && (flic->simm & AIS_MODE_MASK(isc))) {
        flic->nimm |= AIS_MODE_MASK(isc);
        trace_qemu_s390_suppress_airq(isc, "Single-Interruption Mode",
                                      "NO-Interruptions Mode");
    }

    return 0;
}

static void qemu_s390_flic_notify(uint32_t type)
{
    CPUState *cs;

    /*
     * We have to make all CPUs see CPU_INTERRUPT_HARD, so they might
     * consider it. We will kick all running CPUs and only relevant
     * sleeping ones.
     */
    CPU_FOREACH(cs) {
        S390CPU *cpu = S390_CPU(cs);

        cs->interrupt_request |= CPU_INTERRUPT_HARD;

        /* ignore CPUs that are not sleeping */
        if (s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING &&
            s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD) {
            continue;
        }

        /* we always kick running CPUs for now, this is tricky */
        if (cs->halted) {
            /* don't check for subclasses, CPUs double check when waking up */
            if (type & FLIC_PENDING_SERVICE) {
                if (!(cpu->env.psw.mask & PSW_MASK_EXT)) {
                    continue;
                }
            } else if (type & FLIC_PENDING_IO) {
                if (!(cpu->env.psw.mask & PSW_MASK_IO)) {
                    continue;
                }
            } else if (type & FLIC_PENDING_MCHK_CR) {
                if (!(cpu->env.psw.mask & PSW_MASK_MCHECK)) {
                    continue;
                }
            }
        }
        cpu_interrupt(cs, CPU_INTERRUPT_HARD);
    }
}

uint32_t qemu_s390_flic_dequeue_service(QEMUS390FLICState *flic)
{
    uint32_t tmp;

    g_assert(qemu_mutex_iothread_locked());
    g_assert(flic->pending & FLIC_PENDING_SERVICE);
    tmp = flic->service_param;
    flic->service_param = 0;
    flic->pending &= ~FLIC_PENDING_SERVICE;

    return tmp;
}

/* caller has to free the returned object */
QEMUS390FlicIO *qemu_s390_flic_dequeue_io(QEMUS390FLICState *flic, uint64_t cr6)
{
    QEMUS390FlicIO *io;
    uint8_t isc;

    g_assert(qemu_mutex_iothread_locked());
    if (!(flic->pending & CR6_TO_PENDING_IO(cr6))) {
        return NULL;
    }

    for (isc = 0; isc < 8; isc++) {
        if (QLIST_EMPTY(&flic->io[isc]) || !(cr6 & ISC_TO_ISC_BITS(isc))) {
            continue;
        }
        io = QLIST_FIRST(&flic->io[isc]);
        QLIST_REMOVE(io, next);

        /* update our indicator bit */
        if (QLIST_EMPTY(&flic->io[isc])) {
            flic->pending &= ~ISC_TO_PENDING_IO(isc);
        }
        return io;
    }

    return NULL;
}

void qemu_s390_flic_dequeue_crw_mchk(QEMUS390FLICState *flic)
{
    g_assert(qemu_mutex_iothread_locked());
    g_assert(flic->pending & FLIC_PENDING_MCHK_CR);
    flic->pending &= ~FLIC_PENDING_MCHK_CR;
}

static void qemu_s390_inject_service(S390FLICState *fs, uint32_t parm)
{
    QEMUS390FLICState *flic = s390_get_qemu_flic(fs);

    g_assert(qemu_mutex_iothread_locked());
    /* multiplexing is good enough for sclp - kvm does it internally as well */
    flic->service_param |= parm;
    flic->pending |= FLIC_PENDING_SERVICE;

    qemu_s390_flic_notify(FLIC_PENDING_SERVICE);
}

static void qemu_s390_inject_io(S390FLICState *fs, uint16_t subchannel_id,
                                uint16_t subchannel_nr, uint32_t io_int_parm,
                                uint32_t io_int_word)
{
    const uint8_t isc = IO_INT_WORD_ISC(io_int_word);
    QEMUS390FLICState *flic = s390_get_qemu_flic(fs);
    QEMUS390FlicIO *io;

    g_assert(qemu_mutex_iothread_locked());
    io = g_new0(QEMUS390FlicIO, 1);
    io->id = subchannel_id;
    io->nr = subchannel_nr;
    io->parm = io_int_parm;
    io->word = io_int_word;

    QLIST_INSERT_HEAD(&flic->io[isc], io, next);
    flic->pending |= ISC_TO_PENDING_IO(isc);

    qemu_s390_flic_notify(ISC_TO_PENDING_IO(isc));
}

static void qemu_s390_inject_crw_mchk(S390FLICState *fs)
{
    QEMUS390FLICState *flic = s390_get_qemu_flic(fs);

    g_assert(qemu_mutex_iothread_locked());
    flic->pending |= FLIC_PENDING_MCHK_CR;

    qemu_s390_flic_notify(FLIC_PENDING_MCHK_CR);
}

bool qemu_s390_flic_has_service(QEMUS390FLICState *flic)
{
    /* called without lock via cc->has_work, will be validated under lock */
    return !!(flic->pending & FLIC_PENDING_SERVICE);
}

bool qemu_s390_flic_has_io(QEMUS390FLICState *flic, uint64_t cr6)
{
    /* called without lock via cc->has_work, will be validated under lock */
    return !!(flic->pending & CR6_TO_PENDING_IO(cr6));
}

bool qemu_s390_flic_has_crw_mchk(QEMUS390FLICState *flic)
{
    /* called without lock via cc->has_work, will be validated under lock */
    return !!(flic->pending & FLIC_PENDING_MCHK_CR);
}

bool qemu_s390_flic_has_any(QEMUS390FLICState *flic)
{
    g_assert(qemu_mutex_iothread_locked());
    return !!flic->pending;
}

static void qemu_s390_flic_reset(DeviceState *dev)
{
    QEMUS390FLICState *flic = QEMU_S390_FLIC(dev);
    QEMUS390FlicIO *cur, *next;
    int isc;

    g_assert(qemu_mutex_iothread_locked());
    flic->simm = 0;
    flic->nimm = 0;
    flic->pending = 0;

    /* remove all pending io interrupts */
    for (isc = 0; isc < 8; isc++) {
        QLIST_FOREACH_SAFE(cur, &flic->io[isc], next, next) {
            QLIST_REMOVE(cur, next);
            g_free(cur);
        }
    }
}

bool ais_needed(void *opaque)
{
    S390FLICState *s = opaque;

    return s->ais_supported;
}

static const VMStateDescription qemu_s390_flic_vmstate = {
    .name = "qemu-s390-flic",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = ais_needed,
    .fields = (VMStateField[]) {
        VMSTATE_UINT8(simm, QEMUS390FLICState),
        VMSTATE_UINT8(nimm, QEMUS390FLICState),
        VMSTATE_END_OF_LIST()
    }
};

static void qemu_s390_flic_instance_init(Object *obj)
{
    QEMUS390FLICState *flic = QEMU_S390_FLIC(obj);
    int isc;

    for (isc = 0; isc < 8; isc++) {
        QLIST_INIT(&flic->io[isc]);
    }
}

static void qemu_s390_flic_class_init(ObjectClass *oc, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(oc);
    S390FLICStateClass *fsc = S390_FLIC_COMMON_CLASS(oc);

    dc->reset = qemu_s390_flic_reset;
    dc->vmsd = &qemu_s390_flic_vmstate;
    fsc->register_io_adapter = qemu_s390_register_io_adapter;
    fsc->io_adapter_map = qemu_s390_io_adapter_map;
    fsc->add_adapter_routes = qemu_s390_add_adapter_routes;
    fsc->release_adapter_routes = qemu_s390_release_adapter_routes;
    fsc->clear_io_irq = qemu_s390_clear_io_flic;
    fsc->modify_ais_mode = qemu_s390_modify_ais_mode;
    fsc->inject_airq = qemu_s390_inject_airq;
    fsc->inject_service = qemu_s390_inject_service;
    fsc->inject_io = qemu_s390_inject_io;
    fsc->inject_crw_mchk = qemu_s390_inject_crw_mchk;
}

static Property s390_flic_common_properties[] = {
    DEFINE_PROP_UINT32("adapter_routes_max_batch", S390FLICState,
                       adapter_routes_max_batch, ADAPTER_ROUTES_MAX_GSI),
    DEFINE_PROP_END_OF_LIST(),
};

static void s390_flic_common_realize(DeviceState *dev, Error **errp)
{
    S390FLICState *fs = S390_FLIC_COMMON(dev);
    uint32_t max_batch = fs->adapter_routes_max_batch;

    if (max_batch > ADAPTER_ROUTES_MAX_GSI) {
        error_setg(errp, "flic property adapter_routes_max_batch too big"
                   " (%d > %d)", max_batch, ADAPTER_ROUTES_MAX_GSI);
        return;
    }

    fs->ais_supported = s390_has_feat(S390_FEAT_ADAPTER_INT_SUPPRESSION);
}

static void s390_flic_class_init(ObjectClass *oc, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(oc);

    device_class_set_props(dc, s390_flic_common_properties);
    dc->realize = s390_flic_common_realize;
}

static const TypeInfo qemu_s390_flic_info = {
    .name          = TYPE_QEMU_S390_FLIC,
    .parent        = TYPE_S390_FLIC_COMMON,
    .instance_size = sizeof(QEMUS390FLICState),
    .instance_init = qemu_s390_flic_instance_init,
    .class_init    = qemu_s390_flic_class_init,
};


static const TypeInfo s390_flic_common_info = {
    .name          = TYPE_S390_FLIC_COMMON,
    .parent        = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(S390FLICState),
    .class_init    = s390_flic_class_init,
    .class_size    = sizeof(S390FLICStateClass),
};

static void qemu_s390_flic_register_types(void)
{
    type_register_static(&s390_flic_common_info);
    type_register_static(&qemu_s390_flic_info);
}

type_init(qemu_s390_flic_register_types)

static bool adapter_info_so_needed(void *opaque)
{
    return css_migration_enabled();
}

const VMStateDescription vmstate_adapter_info_so = {
    .name = "s390_adapter_info/summary_offset",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = adapter_info_so_needed,
    .fields = (VMStateField[]) {
        VMSTATE_UINT32(summary_offset, AdapterInfo),
        VMSTATE_END_OF_LIST()
    }
};

const VMStateDescription vmstate_adapter_info = {
    .name = "s390_adapter_info",
    .version_id = 1,
    .minimum_version_id = 1,
    .fields = (VMStateField[]) {
        VMSTATE_UINT64(ind_offset, AdapterInfo),
        /*
         * We do not have to migrate neither the id nor the addresses.
         * The id is set by css_register_io_adapter and the addresses
         * are set based on the IndAddr objects after those get mapped.
         */
        VMSTATE_END_OF_LIST()
    },
    .subsections = (const VMStateDescription * []) {
        &vmstate_adapter_info_so,
        NULL
    }
};

const VMStateDescription vmstate_adapter_routes = {

    .name = "s390_adapter_routes",
    .version_id = 1,
    .minimum_version_id = 1,
    .fields = (VMStateField[]) {
        VMSTATE_STRUCT(adapter, AdapterRoutes, 1, vmstate_adapter_info,
                       AdapterInfo),
        VMSTATE_END_OF_LIST()
    }
};