xref: /openbmc/qemu/target/s390x/interrupt.c (revision c39f95dc) 
1 /*
2  * QEMU S/390 Interrupt support
3  *
4  * Copyright IBM Corp. 2012, 2014
5  *
6  * This work is licensed under the terms of the GNU GPL, version 2 or (at your
7  * option) any later version.  See the COPYING file in the top-level directory.
8  */
9 
10 #include "qemu/osdep.h"
11 #include "qemu/log.h"
12 #include "cpu.h"
13 #include "kvm_s390x.h"
14 #include "internal.h"
15 #include "exec/exec-all.h"
16 #include "sysemu/kvm.h"
17 #include "hw/s390x/ioinst.h"
18 
19 /* Ensure to exit the TB after this call! */
20 void trigger_pgm_exception(CPUS390XState *env, uint32_t code, uint32_t ilen)
21 {
22     CPUState *cs = CPU(s390_env_get_cpu(env));
23 
24     cs->exception_index = EXCP_PGM;
25     env->int_pgm_code = code;
26     env->int_pgm_ilen = ilen;
27 }
28 
29 static void tcg_s390_program_interrupt(CPUS390XState *env, uint32_t code,
30                                        int ilen)
31 {
32 #ifdef CONFIG_TCG
33     trigger_pgm_exception(env, code, ilen);
34     cpu_loop_exit(CPU(s390_env_get_cpu(env)));
35 #else
36     g_assert_not_reached();
37 #endif
38 }
39 
40 void program_interrupt(CPUS390XState *env, uint32_t code, int ilen)
41 {
42     S390CPU *cpu = s390_env_get_cpu(env);
43 
44     qemu_log_mask(CPU_LOG_INT, "program interrupt at %#" PRIx64 "\n",
45                   env->psw.addr);
46 
47     if (kvm_enabled()) {
48         kvm_s390_program_interrupt(cpu, code);
49     } else if (tcg_enabled()) {
50         tcg_s390_program_interrupt(env, code, ilen);
51     } else {
52         g_assert_not_reached();
53     }
54 }
55 
56 #if !defined(CONFIG_USER_ONLY)
57 static void cpu_inject_service(S390CPU *cpu, uint32_t param)
58 {
59     CPUS390XState *env = &cpu->env;
60 
61     /* multiplexing is good enough for sclp - kvm does it internally as well*/
62     env->service_param |= param;
63 
64     env->pending_int |= INTERRUPT_EXT_SERVICE;
65     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
66 }
67 
68 void cpu_inject_clock_comparator(S390CPU *cpu)
69 {
70     CPUS390XState *env = &cpu->env;
71 
72     env->pending_int |= INTERRUPT_EXT_CLOCK_COMPARATOR;
73     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
74 }
75 
76 void cpu_inject_cpu_timer(S390CPU *cpu)
77 {
78     CPUS390XState *env = &cpu->env;
79 
80     env->pending_int |= INTERRUPT_EXT_CPU_TIMER;
81     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
82 }
83 
84 void cpu_inject_emergency_signal(S390CPU *cpu, uint16_t src_cpu_addr)
85 {
86     CPUS390XState *env = &cpu->env;
87 
88     g_assert(src_cpu_addr < S390_MAX_CPUS);
89     set_bit(src_cpu_addr, env->emergency_signals);
90 
91     env->pending_int |= INTERRUPT_EMERGENCY_SIGNAL;
92     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
93 }
94 
95 int cpu_inject_external_call(S390CPU *cpu, uint16_t src_cpu_addr)
96 {
97     CPUS390XState *env = &cpu->env;
98 
99     g_assert(src_cpu_addr < S390_MAX_CPUS);
100     if (env->pending_int & INTERRUPT_EXTERNAL_CALL) {
101         return -EBUSY;
102     }
103     env->external_call_addr = src_cpu_addr;
104 
105     env->pending_int |= INTERRUPT_EXTERNAL_CALL;
106     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
107     return 0;
108 }
109 
110 void cpu_inject_restart(S390CPU *cpu)
111 {
112     CPUS390XState *env = &cpu->env;
113 
114     if (kvm_enabled()) {
115         kvm_s390_restart_interrupt(cpu);
116         return;
117     }
118 
119     env->pending_int |= INTERRUPT_RESTART;
120     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
121 }
122 
123 void cpu_inject_stop(S390CPU *cpu)
124 {
125     CPUS390XState *env = &cpu->env;
126 
127     if (kvm_enabled()) {
128         kvm_s390_stop_interrupt(cpu);
129         return;
130     }
131 
132     env->pending_int |= INTERRUPT_STOP;
133     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
134 }
135 
136 static void cpu_inject_io(S390CPU *cpu, uint16_t subchannel_id,
137                           uint16_t subchannel_number,
138                           uint32_t io_int_parm, uint32_t io_int_word)
139 {
140     CPUS390XState *env = &cpu->env;
141     int isc = IO_INT_WORD_ISC(io_int_word);
142 
143     if (env->io_index[isc] == MAX_IO_QUEUE - 1) {
144         /* ugh - can't queue anymore. Let's drop. */
145         return;
146     }
147 
148     env->io_index[isc]++;
149     assert(env->io_index[isc] < MAX_IO_QUEUE);
150 
151     env->io_queue[env->io_index[isc]][isc].id = subchannel_id;
152     env->io_queue[env->io_index[isc]][isc].nr = subchannel_number;
153     env->io_queue[env->io_index[isc]][isc].parm = io_int_parm;
154     env->io_queue[env->io_index[isc]][isc].word = io_int_word;
155 
156     env->pending_int |= INTERRUPT_IO;
157     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
158 }
159 
160 static void cpu_inject_crw_mchk(S390CPU *cpu)
161 {
162     CPUS390XState *env = &cpu->env;
163 
164     if (env->mchk_index == MAX_MCHK_QUEUE - 1) {
165         /* ugh - can't queue anymore. Let's drop. */
166         return;
167     }
168 
169     env->mchk_index++;
170     assert(env->mchk_index < MAX_MCHK_QUEUE);
171 
172     env->mchk_queue[env->mchk_index].type = 1;
173 
174     env->pending_int |= INTERRUPT_MCHK;
175     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
176 }
177 
178 /*
179  * All of the following interrupts are floating, i.e. not per-vcpu.
180  * We just need a dummy cpustate in order to be able to inject in the
181  * non-kvm case.
182  */
183 void s390_sclp_extint(uint32_t parm)
184 {
185     if (kvm_enabled()) {
186         kvm_s390_service_interrupt(parm);
187     } else {
188         S390CPU *dummy_cpu = s390_cpu_addr2state(0);
189 
190         cpu_inject_service(dummy_cpu, parm);
191     }
192 }
193 
194 void s390_io_interrupt(uint16_t subchannel_id, uint16_t subchannel_nr,
195                        uint32_t io_int_parm, uint32_t io_int_word)
196 {
197     if (kvm_enabled()) {
198         kvm_s390_io_interrupt(subchannel_id, subchannel_nr, io_int_parm,
199                               io_int_word);
200     } else {
201         S390CPU *dummy_cpu = s390_cpu_addr2state(0);
202 
203         cpu_inject_io(dummy_cpu, subchannel_id, subchannel_nr, io_int_parm,
204                       io_int_word);
205     }
206 }
207 
208 void s390_crw_mchk(void)
209 {
210     if (kvm_enabled()) {
211         kvm_s390_crw_mchk();
212     } else {
213         S390CPU *dummy_cpu = s390_cpu_addr2state(0);
214 
215         cpu_inject_crw_mchk(dummy_cpu);
216     }
217 }
218 
219 bool s390_cpu_has_mcck_int(S390CPU *cpu)
220 {
221     CPUS390XState *env = &cpu->env;
222 
223     if (!(env->psw.mask & PSW_MASK_MCHECK)) {
224         return false;
225     }
226 
227     return env->pending_int & INTERRUPT_MCHK;
228 }
229 
230 bool s390_cpu_has_ext_int(S390CPU *cpu)
231 {
232     CPUS390XState *env = &cpu->env;
233 
234     if (!(env->psw.mask & PSW_MASK_EXT)) {
235         return false;
236     }
237 
238     if ((env->pending_int & INTERRUPT_EMERGENCY_SIGNAL) &&
239         (env->cregs[0] & CR0_EMERGENCY_SIGNAL_SC)) {
240         return true;
241     }
242 
243     if ((env->pending_int & INTERRUPT_EXTERNAL_CALL) &&
244         (env->cregs[0] & CR0_EXTERNAL_CALL_SC)) {
245         return true;
246     }
247 
248     if ((env->pending_int & INTERRUPT_EXTERNAL_CALL) &&
249         (env->cregs[0] & CR0_EXTERNAL_CALL_SC)) {
250         return true;
251     }
252 
253     if ((env->pending_int & INTERRUPT_EXT_CLOCK_COMPARATOR) &&
254         (env->cregs[0] & CR0_CKC_SC)) {
255         return true;
256     }
257 
258     if ((env->pending_int & INTERRUPT_EXT_CPU_TIMER) &&
259         (env->cregs[0] & CR0_CPU_TIMER_SC)) {
260         return true;
261     }
262 
263     if ((env->pending_int & INTERRUPT_EXT_SERVICE) &&
264         (env->cregs[0] & CR0_SERVICE_SC)) {
265         return true;
266     }
267 
268     return false;
269 }
270 
271 bool s390_cpu_has_io_int(S390CPU *cpu)
272 {
273     CPUS390XState *env = &cpu->env;
274 
275     if (!(env->psw.mask & PSW_MASK_IO)) {
276         return false;
277     }
278 
279     return env->pending_int & INTERRUPT_IO;
280 }
281 
282 bool s390_cpu_has_restart_int(S390CPU *cpu)
283 {
284     CPUS390XState *env = &cpu->env;
285 
286     return env->pending_int & INTERRUPT_RESTART;
287 }
288 
289 bool s390_cpu_has_stop_int(S390CPU *cpu)
290 {
291     CPUS390XState *env = &cpu->env;
292 
293     return env->pending_int & INTERRUPT_STOP;
294 }
295 #endif
296 
297 bool s390_cpu_has_int(S390CPU *cpu)
298 {
299 #ifndef CONFIG_USER_ONLY
300     if (!tcg_enabled()) {
301         return false;
302     }
303     return s390_cpu_has_mcck_int(cpu) ||
304            s390_cpu_has_ext_int(cpu) ||
305            s390_cpu_has_io_int(cpu) ||
306            s390_cpu_has_restart_int(cpu) ||
307            s390_cpu_has_stop_int(cpu);
308 #else
309     return false;
310 #endif
311 }
312