3 #include <linux/slab.h>
4 #include <linux/cpumask.h>
5 #include <linux/percpu.h>
7 #include <xen/events.h>
9 #include <xen/hvc-console.h>
13 static DEFINE_PER_CPU(struct xen_common_irq
, xen_resched_irq
) = { .irq
= -1 };
14 static DEFINE_PER_CPU(struct xen_common_irq
, xen_callfunc_irq
) = { .irq
= -1 };
15 static DEFINE_PER_CPU(struct xen_common_irq
, xen_callfuncsingle_irq
) = { .irq
= -1 };
16 static DEFINE_PER_CPU(struct xen_common_irq
, xen_debug_irq
) = { .irq
= -1 };
18 static irqreturn_t
xen_call_function_interrupt(int irq
, void *dev_id
);
19 static irqreturn_t
xen_call_function_single_interrupt(int irq
, void *dev_id
);
22 * Reschedule call back.
24 static irqreturn_t
xen_reschedule_interrupt(int irq
, void *dev_id
)
26 inc_irq_stat(irq_resched_count
);
32 void xen_smp_intr_free(unsigned int cpu
)
34 if (per_cpu(xen_resched_irq
, cpu
).irq
>= 0) {
35 unbind_from_irqhandler(per_cpu(xen_resched_irq
, cpu
).irq
, NULL
);
36 per_cpu(xen_resched_irq
, cpu
).irq
= -1;
37 kfree(per_cpu(xen_resched_irq
, cpu
).name
);
38 per_cpu(xen_resched_irq
, cpu
).name
= NULL
;
40 if (per_cpu(xen_callfunc_irq
, cpu
).irq
>= 0) {
41 unbind_from_irqhandler(per_cpu(xen_callfunc_irq
, cpu
).irq
, NULL
);
42 per_cpu(xen_callfunc_irq
, cpu
).irq
= -1;
43 kfree(per_cpu(xen_callfunc_irq
, cpu
).name
);
44 per_cpu(xen_callfunc_irq
, cpu
).name
= NULL
;
46 if (per_cpu(xen_debug_irq
, cpu
).irq
>= 0) {
47 unbind_from_irqhandler(per_cpu(xen_debug_irq
, cpu
).irq
, NULL
);
48 per_cpu(xen_debug_irq
, cpu
).irq
= -1;
49 kfree(per_cpu(xen_debug_irq
, cpu
).name
);
50 per_cpu(xen_debug_irq
, cpu
).name
= NULL
;
52 if (per_cpu(xen_callfuncsingle_irq
, cpu
).irq
>= 0) {
53 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq
, cpu
).irq
,
55 per_cpu(xen_callfuncsingle_irq
, cpu
).irq
= -1;
56 kfree(per_cpu(xen_callfuncsingle_irq
, cpu
).name
);
57 per_cpu(xen_callfuncsingle_irq
, cpu
).name
= NULL
;
61 int xen_smp_intr_init(unsigned int cpu
)
64 char *resched_name
, *callfunc_name
, *debug_name
;
66 resched_name
= kasprintf(GFP_KERNEL
, "resched%d", cpu
);
67 rc
= bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR
,
69 xen_reschedule_interrupt
,
70 IRQF_PERCPU
|IRQF_NOBALANCING
,
75 per_cpu(xen_resched_irq
, cpu
).irq
= rc
;
76 per_cpu(xen_resched_irq
, cpu
).name
= resched_name
;
78 callfunc_name
= kasprintf(GFP_KERNEL
, "callfunc%d", cpu
);
79 rc
= bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR
,
81 xen_call_function_interrupt
,
82 IRQF_PERCPU
|IRQF_NOBALANCING
,
87 per_cpu(xen_callfunc_irq
, cpu
).irq
= rc
;
88 per_cpu(xen_callfunc_irq
, cpu
).name
= callfunc_name
;
90 debug_name
= kasprintf(GFP_KERNEL
, "debug%d", cpu
);
91 rc
= bind_virq_to_irqhandler(VIRQ_DEBUG
, cpu
, xen_debug_interrupt
,
92 IRQF_PERCPU
| IRQF_NOBALANCING
,
96 per_cpu(xen_debug_irq
, cpu
).irq
= rc
;
97 per_cpu(xen_debug_irq
, cpu
).name
= debug_name
;
99 callfunc_name
= kasprintf(GFP_KERNEL
, "callfuncsingle%d", cpu
);
100 rc
= bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR
,
102 xen_call_function_single_interrupt
,
103 IRQF_PERCPU
|IRQF_NOBALANCING
,
108 per_cpu(xen_callfuncsingle_irq
, cpu
).irq
= rc
;
109 per_cpu(xen_callfuncsingle_irq
, cpu
).name
= callfunc_name
;
114 xen_smp_intr_free(cpu
);
118 void __init
xen_smp_cpus_done(unsigned int max_cpus
)
120 int cpu
, rc
, count
= 0;
122 if (xen_hvm_domain())
123 native_smp_cpus_done(max_cpus
);
125 if (xen_have_vcpu_info_placement
)
128 for_each_online_cpu(cpu
) {
129 if (xen_vcpu_nr(cpu
) < MAX_VIRT_CPUS
)
136 * Reset vcpu_info so this cpu cannot be onlined again.
138 xen_vcpu_info_reset(cpu
);
141 pr_warn("%s: failed to bring CPU %d down, error %d\n",
145 WARN(count
, "%s: brought %d CPUs offline\n", __func__
, count
);
148 void xen_smp_send_reschedule(int cpu
)
150 xen_send_IPI_one(cpu
, XEN_RESCHEDULE_VECTOR
);
153 static void __xen_send_IPI_mask(const struct cpumask
*mask
,
158 for_each_cpu_and(cpu
, mask
, cpu_online_mask
)
159 xen_send_IPI_one(cpu
, vector
);
162 void xen_smp_send_call_function_ipi(const struct cpumask
*mask
)
166 __xen_send_IPI_mask(mask
, XEN_CALL_FUNCTION_VECTOR
);
168 /* Make sure other vcpus get a chance to run if they need to. */
169 for_each_cpu(cpu
, mask
) {
170 if (xen_vcpu_stolen(cpu
)) {
171 HYPERVISOR_sched_op(SCHEDOP_yield
, NULL
);
177 void xen_smp_send_call_function_single_ipi(int cpu
)
179 __xen_send_IPI_mask(cpumask_of(cpu
),
180 XEN_CALL_FUNCTION_SINGLE_VECTOR
);
183 static inline int xen_map_vector(int vector
)
188 case RESCHEDULE_VECTOR
:
189 xen_vector
= XEN_RESCHEDULE_VECTOR
;
191 case CALL_FUNCTION_VECTOR
:
192 xen_vector
= XEN_CALL_FUNCTION_VECTOR
;
194 case CALL_FUNCTION_SINGLE_VECTOR
:
195 xen_vector
= XEN_CALL_FUNCTION_SINGLE_VECTOR
;
197 case IRQ_WORK_VECTOR
:
198 xen_vector
= XEN_IRQ_WORK_VECTOR
;
202 case APIC_DM_NMI
: /* Some use that instead of NMI_VECTOR */
203 xen_vector
= XEN_NMI_VECTOR
;
208 printk(KERN_ERR
"xen: vector 0x%x is not implemented\n",
215 void xen_send_IPI_mask(const struct cpumask
*mask
,
218 int xen_vector
= xen_map_vector(vector
);
221 __xen_send_IPI_mask(mask
, xen_vector
);
224 void xen_send_IPI_all(int vector
)
226 int xen_vector
= xen_map_vector(vector
);
229 __xen_send_IPI_mask(cpu_online_mask
, xen_vector
);
232 void xen_send_IPI_self(int vector
)
234 int xen_vector
= xen_map_vector(vector
);
237 xen_send_IPI_one(smp_processor_id(), xen_vector
);
240 void xen_send_IPI_mask_allbutself(const struct cpumask
*mask
,
244 unsigned int this_cpu
= smp_processor_id();
245 int xen_vector
= xen_map_vector(vector
);
247 if (!(num_online_cpus() > 1) || (xen_vector
< 0))
250 for_each_cpu_and(cpu
, mask
, cpu_online_mask
) {
254 xen_send_IPI_one(cpu
, xen_vector
);
258 void xen_send_IPI_allbutself(int vector
)
260 xen_send_IPI_mask_allbutself(cpu_online_mask
, vector
);
263 static irqreturn_t
xen_call_function_interrupt(int irq
, void *dev_id
)
266 generic_smp_call_function_interrupt();
267 inc_irq_stat(irq_call_count
);
273 static irqreturn_t
xen_call_function_single_interrupt(int irq
, void *dev_id
)
276 generic_smp_call_function_single_interrupt();
277 inc_irq_stat(irq_call_count
);