x86/xen: split off smp_pv.c
[muen/linux.git] / arch / x86 / xen / smp.c
1 #include <linux/smp.h>
2 #include <linux/slab.h>
3 #include <linux/cpumask.h>
4 #include <linux/percpu.h>
5
6 #include <xen/events.h>
7
8 #include <xen/hvc-console.h>
9 #include "xen-ops.h"
10 #include "smp.h"
11
12 static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
13 static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
14 static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
15 static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
16
17 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
18 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
19
20 /*
21  * Reschedule call back.
22  */
23 static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
24 {
25         inc_irq_stat(irq_resched_count);
26         scheduler_ipi();
27
28         return IRQ_HANDLED;
29 }
30
31 void xen_smp_intr_free(unsigned int cpu)
32 {
33         if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
34                 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
35                 per_cpu(xen_resched_irq, cpu).irq = -1;
36                 kfree(per_cpu(xen_resched_irq, cpu).name);
37                 per_cpu(xen_resched_irq, cpu).name = NULL;
38         }
39         if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) {
40                 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL);
41                 per_cpu(xen_callfunc_irq, cpu).irq = -1;
42                 kfree(per_cpu(xen_callfunc_irq, cpu).name);
43                 per_cpu(xen_callfunc_irq, cpu).name = NULL;
44         }
45         if (per_cpu(xen_debug_irq, cpu).irq >= 0) {
46                 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL);
47                 per_cpu(xen_debug_irq, cpu).irq = -1;
48                 kfree(per_cpu(xen_debug_irq, cpu).name);
49                 per_cpu(xen_debug_irq, cpu).name = NULL;
50         }
51         if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) {
52                 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq,
53                                        NULL);
54                 per_cpu(xen_callfuncsingle_irq, cpu).irq = -1;
55                 kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
56                 per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
57         }
58 }
59
60 int xen_smp_intr_init(unsigned int cpu)
61 {
62         int rc;
63         char *resched_name, *callfunc_name, *debug_name;
64
65         resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
66         rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
67                                     cpu,
68                                     xen_reschedule_interrupt,
69                                     IRQF_PERCPU|IRQF_NOBALANCING,
70                                     resched_name,
71                                     NULL);
72         if (rc < 0)
73                 goto fail;
74         per_cpu(xen_resched_irq, cpu).irq = rc;
75         per_cpu(xen_resched_irq, cpu).name = resched_name;
76
77         callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
78         rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
79                                     cpu,
80                                     xen_call_function_interrupt,
81                                     IRQF_PERCPU|IRQF_NOBALANCING,
82                                     callfunc_name,
83                                     NULL);
84         if (rc < 0)
85                 goto fail;
86         per_cpu(xen_callfunc_irq, cpu).irq = rc;
87         per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
88
89         debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
90         rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
91                                      IRQF_PERCPU | IRQF_NOBALANCING,
92                                      debug_name, NULL);
93         if (rc < 0)
94                 goto fail;
95         per_cpu(xen_debug_irq, cpu).irq = rc;
96         per_cpu(xen_debug_irq, cpu).name = debug_name;
97
98         callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
99         rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
100                                     cpu,
101                                     xen_call_function_single_interrupt,
102                                     IRQF_PERCPU|IRQF_NOBALANCING,
103                                     callfunc_name,
104                                     NULL);
105         if (rc < 0)
106                 goto fail;
107         per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
108         per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
109
110         return 0;
111
112  fail:
113         xen_smp_intr_free(cpu);
114         return rc;
115 }
116
117 void xen_smp_send_reschedule(int cpu)
118 {
119         xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
120 }
121
122 static void __xen_send_IPI_mask(const struct cpumask *mask,
123                               int vector)
124 {
125         unsigned cpu;
126
127         for_each_cpu_and(cpu, mask, cpu_online_mask)
128                 xen_send_IPI_one(cpu, vector);
129 }
130
131 void xen_smp_send_call_function_ipi(const struct cpumask *mask)
132 {
133         int cpu;
134
135         __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
136
137         /* Make sure other vcpus get a chance to run if they need to. */
138         for_each_cpu(cpu, mask) {
139                 if (xen_vcpu_stolen(cpu)) {
140                         HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
141                         break;
142                 }
143         }
144 }
145
146 void xen_smp_send_call_function_single_ipi(int cpu)
147 {
148         __xen_send_IPI_mask(cpumask_of(cpu),
149                           XEN_CALL_FUNCTION_SINGLE_VECTOR);
150 }
151
152 static inline int xen_map_vector(int vector)
153 {
154         int xen_vector;
155
156         switch (vector) {
157         case RESCHEDULE_VECTOR:
158                 xen_vector = XEN_RESCHEDULE_VECTOR;
159                 break;
160         case CALL_FUNCTION_VECTOR:
161                 xen_vector = XEN_CALL_FUNCTION_VECTOR;
162                 break;
163         case CALL_FUNCTION_SINGLE_VECTOR:
164                 xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
165                 break;
166         case IRQ_WORK_VECTOR:
167                 xen_vector = XEN_IRQ_WORK_VECTOR;
168                 break;
169 #ifdef CONFIG_X86_64
170         case NMI_VECTOR:
171         case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */
172                 xen_vector = XEN_NMI_VECTOR;
173                 break;
174 #endif
175         default:
176                 xen_vector = -1;
177                 printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
178                         vector);
179         }
180
181         return xen_vector;
182 }
183
184 void xen_send_IPI_mask(const struct cpumask *mask,
185                               int vector)
186 {
187         int xen_vector = xen_map_vector(vector);
188
189         if (xen_vector >= 0)
190                 __xen_send_IPI_mask(mask, xen_vector);
191 }
192
193 void xen_send_IPI_all(int vector)
194 {
195         int xen_vector = xen_map_vector(vector);
196
197         if (xen_vector >= 0)
198                 __xen_send_IPI_mask(cpu_online_mask, xen_vector);
199 }
200
201 void xen_send_IPI_self(int vector)
202 {
203         int xen_vector = xen_map_vector(vector);
204
205         if (xen_vector >= 0)
206                 xen_send_IPI_one(smp_processor_id(), xen_vector);
207 }
208
209 void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
210                                 int vector)
211 {
212         unsigned cpu;
213         unsigned int this_cpu = smp_processor_id();
214         int xen_vector = xen_map_vector(vector);
215
216         if (!(num_online_cpus() > 1) || (xen_vector < 0))
217                 return;
218
219         for_each_cpu_and(cpu, mask, cpu_online_mask) {
220                 if (this_cpu == cpu)
221                         continue;
222
223                 xen_send_IPI_one(cpu, xen_vector);
224         }
225 }
226
227 void xen_send_IPI_allbutself(int vector)
228 {
229         xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
230 }
231
232 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
233 {
234         irq_enter();
235         generic_smp_call_function_interrupt();
236         inc_irq_stat(irq_call_count);
237         irq_exit();
238
239         return IRQ_HANDLED;
240 }
241
242 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
243 {
244         irq_enter();
245         generic_smp_call_function_single_interrupt();
246         inc_irq_stat(irq_call_count);
247         irq_exit();
248
249         return IRQ_HANDLED;
250 }