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1 /*
2  * SCLP Support
3  *
4  * Copyright IBM, Corp. 2012
5  *
6  * Authors:
7  *  Christian Borntraeger <[email protected]>
8  *  Heinz Graalfs <[email protected]>
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 "cpu.h"
16 #include "sysemu/kvm.h"
17 #include "exec/memory.h"
18 #include "sysemu/sysemu.h"
19
20 #include "hw/s390x/sclp.h"
21
22 static inline S390SCLPDevice *get_event_facility(void)
23 {
24     ObjectProperty *op = object_property_find(qdev_get_machine(),
25                                               "s390-sclp-event-facility",
26                                               NULL);
27     assert(op);
28     return op->opaque;
29 }
30
31 /* Provide information about the configuration, CPUs and storage */
32 static void read_SCP_info(SCCB *sccb)
33 {
34     ReadInfo *read_info = (ReadInfo *) sccb;
35     CPUState *cpu;
36     int shift = 0;
37     int cpu_count = 0;
38     int i = 0;
39
40     CPU_FOREACH(cpu) {
41         cpu_count++;
42     }
43
44     /* CPU information */
45     read_info->entries_cpu = cpu_to_be16(cpu_count);
46     read_info->offset_cpu = cpu_to_be16(offsetof(ReadInfo, entries));
47     read_info->highest_cpu = cpu_to_be16(max_cpus);
48
49     for (i = 0; i < cpu_count; i++) {
50         read_info->entries[i].address = i;
51         read_info->entries[i].type = 0;
52     }
53
54     read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO);
55
56     while ((ram_size >> (20 + shift)) > 65535) {
57         shift++;
58     }
59     read_info->rnmax = cpu_to_be16(ram_size >> (20 + shift));
60     read_info->rnsize = 1 << shift;
61     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
62 }
63
64 /* Provide information about the CPU */
65 static void sclp_read_cpu_info(SCCB *sccb)
66 {
67     ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
68     CPUState *cpu;
69     int cpu_count = 0;
70     int i = 0;
71
72     CPU_FOREACH(cpu) {
73         cpu_count++;
74     }
75
76     cpu_info->nr_configured = cpu_to_be16(cpu_count);
77     cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
78     cpu_info->nr_standby = cpu_to_be16(0);
79
80     /* The standby offset is 16-byte for each CPU */
81     cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
82         + cpu_info->nr_configured*sizeof(CPUEntry));
83
84     for (i = 0; i < cpu_count; i++) {
85         cpu_info->entries[i].address = i;
86         cpu_info->entries[i].type = 0;
87     }
88
89     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
90 }
91
92 static void sclp_execute(SCCB *sccb, uint64_t code)
93 {
94     S390SCLPDevice *sdev = get_event_facility();
95
96     switch (code & SCLP_CMD_CODE_MASK) {
97     case SCLP_CMDW_READ_SCP_INFO:
98     case SCLP_CMDW_READ_SCP_INFO_FORCED:
99         read_SCP_info(sccb);
100         break;
101     case SCLP_CMDW_READ_CPU_INFO:
102         sclp_read_cpu_info(sccb);
103         break;
104     default:
105         sdev->sclp_command_handler(sdev->ef, sccb, code);
106         break;
107     }
108 }
109
110 int sclp_service_call(uint32_t sccb, uint64_t code)
111 {
112     int r = 0;
113     SCCB work_sccb;
114
115     hwaddr sccb_len = sizeof(SCCB);
116
117     /* first some basic checks on program checks */
118     if (cpu_physical_memory_is_io(sccb)) {
119         r = -PGM_ADDRESSING;
120         goto out;
121     }
122     if (sccb & ~0x7ffffff8ul) {
123         r = -PGM_SPECIFICATION;
124         goto out;
125     }
126
127     /*
128      * we want to work on a private copy of the sccb, to prevent guests
129      * from playing dirty tricks by modifying the memory content after
130      * the host has checked the values
131      */
132     cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
133
134     /* Valid sccb sizes */
135     if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) ||
136         be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) {
137         r = -PGM_SPECIFICATION;
138         goto out;
139     }
140
141     sclp_execute((SCCB *)&work_sccb, code);
142
143     cpu_physical_memory_write(sccb, &work_sccb,
144                               be16_to_cpu(work_sccb.h.length));
145
146     sclp_service_interrupt(sccb);
147
148 out:
149     return r;
150 }
151
152 void sclp_service_interrupt(uint32_t sccb)
153 {
154     S390SCLPDevice *sdev = get_event_facility();
155     uint32_t param = sccb & ~3;
156
157     /* Indicate whether an event is still pending */
158     param |= sdev->event_pending(sdev->ef) ? 1 : 0;
159
160     if (!param) {
161         /* No need to send an interrupt, there's nothing to be notified about */
162         return;
163     }
164     s390_sclp_extint(param);
165 }
166
167 /* qemu object creation and initialization functions */
168
169 void s390_sclp_init(void)
170 {
171     DeviceState *dev  = qdev_create(NULL, "s390-sclp-event-facility");
172
173     object_property_add_child(qdev_get_machine(), "s390-sclp-event-facility",
174                               OBJECT(dev), NULL);
175     qdev_init_nofail(dev);
176 }
177
178 static int s390_sclp_dev_init(SysBusDevice *dev)
179 {
180     int r;
181     S390SCLPDevice *sdev = (S390SCLPDevice *)dev;
182     S390SCLPDeviceClass *sclp = SCLP_S390_DEVICE_GET_CLASS(dev);
183
184     r = sclp->init(sdev);
185     if (!r) {
186         assert(sdev->event_pending);
187         assert(sdev->sclp_command_handler);
188     }
189
190     return r;
191 }
192
193 static void s390_sclp_device_class_init(ObjectClass *klass, void *data)
194 {
195     SysBusDeviceClass *dc = SYS_BUS_DEVICE_CLASS(klass);
196
197     dc->init = s390_sclp_dev_init;
198 }
199
200 static const TypeInfo s390_sclp_device_info = {
201     .name = TYPE_DEVICE_S390_SCLP,
202     .parent = TYPE_SYS_BUS_DEVICE,
203     .instance_size = sizeof(S390SCLPDevice),
204     .class_init = s390_sclp_device_class_init,
205     .class_size = sizeof(S390SCLPDeviceClass),
206     .abstract = true,
207 };
208
209 static void s390_sclp_register_types(void)
210 {
211     type_register_static(&s390_sclp_device_info);
212 }
213
214 type_init(s390_sclp_register_types)
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