[mirror_ubuntu-artful-kernel.git] / arch / x86 / xen / smp.c

#include <linux/smp.h>
#include <linux/cpu.h>
#include <linux/slab.h>
#include <linux/cpumask.h>
#include <linux/percpu.h>

#include <xen/events.h>

#include <xen/hvc-console.h>
#include "xen-ops.h"
#include "smp.h"

static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };

static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);

/*
 * Reschedule call back.
 */
static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
{
	inc_irq_stat(irq_resched_count);
	scheduler_ipi();

	return IRQ_HANDLED;
}

void xen_smp_intr_free(unsigned int cpu)
{
	if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
		unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
		per_cpu(xen_resched_irq, cpu).irq = -1;
		kfree(per_cpu(xen_resched_irq, cpu).name);
		per_cpu(xen_resched_irq, cpu).name = NULL;
	}
	if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) {
		unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL);
		per_cpu(xen_callfunc_irq, cpu).irq = -1;
		kfree(per_cpu(xen_callfunc_irq, cpu).name);
		per_cpu(xen_callfunc_irq, cpu).name = NULL;
	}
	if (per_cpu(xen_debug_irq, cpu).irq >= 0) {
		unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL);
		per_cpu(xen_debug_irq, cpu).irq = -1;
		kfree(per_cpu(xen_debug_irq, cpu).name);
		per_cpu(xen_debug_irq, cpu).name = NULL;
	}
	if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) {
		unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq,
				       NULL);
		per_cpu(xen_callfuncsingle_irq, cpu).irq = -1;
		kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
		per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
	}
}

int xen_smp_intr_init(unsigned int cpu)
{
	int rc;
	char *resched_name, *callfunc_name, *debug_name;

	resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
	rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
				    cpu,
				    xen_reschedule_interrupt,
				    IRQF_PERCPU|IRQF_NOBALANCING,
				    resched_name,
				    NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_resched_irq, cpu).irq = rc;
	per_cpu(xen_resched_irq, cpu).name = resched_name;

	callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
				    cpu,
				    xen_call_function_interrupt,
				    IRQF_PERCPU|IRQF_NOBALANCING,
				    callfunc_name,
				    NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_callfunc_irq, cpu).irq = rc;
	per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;

	debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
	rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
				     IRQF_PERCPU | IRQF_NOBALANCING,
				     debug_name, NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_debug_irq, cpu).irq = rc;
	per_cpu(xen_debug_irq, cpu).name = debug_name;

	callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
				    cpu,
				    xen_call_function_single_interrupt,
				    IRQF_PERCPU|IRQF_NOBALANCING,
				    callfunc_name,
				    NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
	per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;

	return 0;

 fail:
	xen_smp_intr_free(cpu);
	return rc;
}

void __init xen_smp_cpus_done(unsigned int max_cpus)
{
	int cpu, rc, count = 0;

	if (xen_hvm_domain())
		native_smp_cpus_done(max_cpus);

	if (xen_have_vcpu_info_placement)
		return;

	for_each_online_cpu(cpu) {
		if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
			continue;

		rc = cpu_down(cpu);

		if (rc == 0) {
			/*
			 * Reset vcpu_info so this cpu cannot be onlined again.
			 */
			xen_vcpu_info_reset(cpu);
			count++;
		} else {
			pr_warn("%s: failed to bring CPU %d down, error %d\n",
				__func__, cpu, rc);
		}
	}
	WARN(count, "%s: brought %d CPUs offline\n", __func__, count);
}

void xen_smp_send_reschedule(int cpu)
{
	xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
}

static void __xen_send_IPI_mask(const struct cpumask *mask,
			      int vector)
{
	unsigned cpu;

	for_each_cpu_and(cpu, mask, cpu_online_mask)
		xen_send_IPI_one(cpu, vector);
}

void xen_smp_send_call_function_ipi(const struct cpumask *mask)
{
	int cpu;

	__xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);

	/* Make sure other vcpus get a chance to run if they need to. */
	for_each_cpu(cpu, mask) {
		if (xen_vcpu_stolen(cpu)) {
			HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
			break;
		}
	}
}

void xen_smp_send_call_function_single_ipi(int cpu)
{
	__xen_send_IPI_mask(cpumask_of(cpu),
			  XEN_CALL_FUNCTION_SINGLE_VECTOR);
}

static inline int xen_map_vector(int vector)
{
	int xen_vector;

	switch (vector) {
	case RESCHEDULE_VECTOR:
		xen_vector = XEN_RESCHEDULE_VECTOR;
		break;
	case CALL_FUNCTION_VECTOR:
		xen_vector = XEN_CALL_FUNCTION_VECTOR;
		break;
	case CALL_FUNCTION_SINGLE_VECTOR:
		xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
		break;
	case IRQ_WORK_VECTOR:
		xen_vector = XEN_IRQ_WORK_VECTOR;
		break;
#ifdef CONFIG_X86_64
	case NMI_VECTOR:
	case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */
		xen_vector = XEN_NMI_VECTOR;
		break;
#endif
	default:
		xen_vector = -1;
		printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
			vector);
	}

	return xen_vector;
}

void xen_send_IPI_mask(const struct cpumask *mask,
			      int vector)
{
	int xen_vector = xen_map_vector(vector);

	if (xen_vector >= 0)
		__xen_send_IPI_mask(mask, xen_vector);
}

void xen_send_IPI_all(int vector)
{
	int xen_vector = xen_map_vector(vector);

	if (xen_vector >= 0)
		__xen_send_IPI_mask(cpu_online_mask, xen_vector);
}

void xen_send_IPI_self(int vector)
{
	int xen_vector = xen_map_vector(vector);

	if (xen_vector >= 0)
		xen_send_IPI_one(smp_processor_id(), xen_vector);
}

void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
				int vector)
{
	unsigned cpu;
	unsigned int this_cpu = smp_processor_id();
	int xen_vector = xen_map_vector(vector);

	if (!(num_online_cpus() > 1) || (xen_vector < 0))
		return;

	for_each_cpu_and(cpu, mask, cpu_online_mask) {
		if (this_cpu == cpu)
			continue;

		xen_send_IPI_one(cpu, xen_vector);
	}
}

void xen_send_IPI_allbutself(int vector)
{
	xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
}

static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
{
	irq_enter();
	generic_smp_call_function_interrupt();
	inc_irq_stat(irq_call_count);
	irq_exit();

	return IRQ_HANDLED;
}

static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
{
	irq_enter();
	generic_smp_call_function_single_interrupt();
	inc_irq_stat(irq_call_count);
	irq_exit();

	return IRQ_HANDLED;
}
Commit	Line	Data
f87e4cac	1	#include <linux/smp.h>
ae039001	2	#include <linux/cpu.h>
83b96794 VK	3	#include <linux/slab.h>
	4	#include <linux/cpumask.h>
	5	#include <linux/percpu.h>
f87e4cac	6
f87e4cac JF	7	#include <xen/events.h>
f87e4cac JF	8
ed467e69	9	#include <xen/hvc-console.h>
f87e4cac	10	#include "xen-ops.h"
a2ef5dc2	11	#include "smp.h"
f87e4cac	12
ee336e10 KRW	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 };
9547689f	16	static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
f87e4cac JF	17
f87e4cac JF	18	static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
3b16cf87	19	static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
f87e4cac JF	20
f87e4cac JF	21	/*
184748cc	22	* Reschedule call back.
f87e4cac JF	23	*/
	24	static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
	25	{
1b437c8c	26	inc_irq_stat(irq_resched_count);
184748cc	27	scheduler_ipi();
38bb5ab4	28
f87e4cac JF	29	return IRQ_HANDLED;
	30	}
	31
5fc509bc	32	void xen_smp_intr_free(unsigned int cpu)
53b94fdc	33	{
ee336e10	34	if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
9547689f	35	unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
ee336e10	36	per_cpu(xen_resched_irq, cpu).irq = -1;
b85fffec KRW	37	kfree(per_cpu(xen_resched_irq, cpu).name);
b85fffec KRW	38	per_cpu(xen_resched_irq, cpu).name = NULL;
ee336e10 KRW	39	}
ee336e10 KRW	40	if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) {
9547689f	41	unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL);
ee336e10	42	per_cpu(xen_callfunc_irq, cpu).irq = -1;
b85fffec KRW	43	kfree(per_cpu(xen_callfunc_irq, cpu).name);
b85fffec KRW	44	per_cpu(xen_callfunc_irq, cpu).name = NULL;
ee336e10 KRW	45	}
ee336e10 KRW	46	if (per_cpu(xen_debug_irq, cpu).irq >= 0) {
9547689f	47	unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL);
ee336e10	48	per_cpu(xen_debug_irq, cpu).irq = -1;
b85fffec KRW	49	kfree(per_cpu(xen_debug_irq, cpu).name);
b85fffec KRW	50	per_cpu(xen_debug_irq, cpu).name = NULL;
ee336e10 KRW	51	}
ee336e10 KRW	52	if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) {
9547689f	53	unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq,
53b94fdc	54	NULL);
ee336e10	55	per_cpu(xen_callfuncsingle_irq, cpu).irq = -1;
b85fffec KRW	56	kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
b85fffec KRW	57	per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
ee336e10	58	}
04e95761	59	}
53b94fdc	60
5fc509bc	61	int xen_smp_intr_init(unsigned int cpu)
f87e4cac JF	62	{
f87e4cac JF	63	int rc;
04e95761	64	char resched_name, callfunc_name, *debug_name;
f87e4cac JF	65
	66	resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
	67	rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
	68	cpu,
	69	xen_reschedule_interrupt,
9d71cee6	70	IRQF_PERCPU\|IRQF_NOBALANCING,
f87e4cac JF	71	resched_name,
	72	NULL);
	73	if (rc < 0)
	74	goto fail;
9547689f	75	per_cpu(xen_resched_irq, cpu).irq = rc;
b85fffec	76	per_cpu(xen_resched_irq, cpu).name = resched_name;
f87e4cac JF	77
	78	callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
	79	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
	80	cpu,
	81	xen_call_function_interrupt,
9d71cee6	82	IRQF_PERCPU\|IRQF_NOBALANCING,
f87e4cac JF	83	callfunc_name,
	84	NULL);
	85	if (rc < 0)
	86	goto fail;
9547689f	87	per_cpu(xen_callfunc_irq, cpu).irq = rc;
b85fffec	88	per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
f87e4cac	89
ee523ca1 JF	90	debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
ee523ca1 JF	91	rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
9d71cee6	92	IRQF_PERCPU \| IRQF_NOBALANCING,
ee523ca1 JF	93	debug_name, NULL);
	94	if (rc < 0)
	95	goto fail;
9547689f	96	per_cpu(xen_debug_irq, cpu).irq = rc;
b85fffec	97	per_cpu(xen_debug_irq, cpu).name = debug_name;
ee523ca1	98
3b16cf87 JA	99	callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
	100	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
	101	cpu,
	102	xen_call_function_single_interrupt,
9d71cee6	103	IRQF_PERCPU\|IRQF_NOBALANCING,
3b16cf87 JA	104	callfunc_name,
	105	NULL);
	106	if (rc < 0)
	107	goto fail;
9547689f	108	per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
b85fffec	109	per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
3b16cf87	110
04e95761 VK	111	return 0;
	112
	113	fail:
	114	xen_smp_intr_free(cpu);
	115	return rc;
	116	}
	117
ae039001 AA	118	void __init xen_smp_cpus_done(unsigned int max_cpus)
	119	{
	120	int cpu, rc, count = 0;
	121
	122	if (xen_hvm_domain())
	123	native_smp_cpus_done(max_cpus);
	124
	125	if (xen_have_vcpu_info_placement)
	126	return;
	127
	128	for_each_online_cpu(cpu) {
	129	if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
	130	continue;
	131
	132	rc = cpu_down(cpu);
	133
	134	if (rc == 0) {
	135	/*
	136	* Reset vcpu_info so this cpu cannot be onlined again.
	137	*/
	138	xen_vcpu_info_reset(cpu);
	139	count++;
	140	} else {
	141	pr_warn("%s: failed to bring CPU %d down, error %d\n",
	142	__func__, cpu, rc);
	143	}
	144	}
	145	WARN(count, "%s: brought %d CPUs offline\n", __func__, count);
	146	}
	147
a52482d9	148	void xen_smp_send_reschedule(int cpu)
f87e4cac JF	149	{
	150	xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
	151	}
	152
f447d56d BG	153	static void __xen_send_IPI_mask(const struct cpumask *mask,
f447d56d BG	154	int vector)
f87e4cac JF	155	{
	156	unsigned cpu;
	157
bcda016e	158	for_each_cpu_and(cpu, mask, cpu_online_mask)
f87e4cac JF	159	xen_send_IPI_one(cpu, vector);
	160	}
	161
a52482d9	162	void xen_smp_send_call_function_ipi(const struct cpumask *mask)
3b16cf87 JA	163	{
	164	int cpu;
	165
f447d56d	166	__xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
3b16cf87 JA	167
3b16cf87 JA	168	/* Make sure other vcpus get a chance to run if they need to. */
bcda016e	169	for_each_cpu(cpu, mask) {
3b16cf87	170	if (xen_vcpu_stolen(cpu)) {
1207cf8e	171	HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
3b16cf87 JA	172	break;
	173	}
	174	}
	175	}
	176
a52482d9	177	void xen_smp_send_call_function_single_ipi(int cpu)
3b16cf87	178	{
f447d56d	179	__xen_send_IPI_mask(cpumask_of(cpu),
e7986739	180	XEN_CALL_FUNCTION_SINGLE_VECTOR);
3b16cf87 JA	181	}
3b16cf87 JA	182
f447d56d BG	183	static inline int xen_map_vector(int vector)
	184	{
	185	int xen_vector;
	186
	187	switch (vector) {
	188	case RESCHEDULE_VECTOR:
	189	xen_vector = XEN_RESCHEDULE_VECTOR;
	190	break;
	191	case CALL_FUNCTION_VECTOR:
	192	xen_vector = XEN_CALL_FUNCTION_VECTOR;
	193	break;
	194	case CALL_FUNCTION_SINGLE_VECTOR:
	195	xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
	196	break;
1ff2b0c3 LM	197	case IRQ_WORK_VECTOR:
	198	xen_vector = XEN_IRQ_WORK_VECTOR;
	199	break;
6efa20e4 KRW	200	#ifdef CONFIG_X86_64
	201	case NMI_VECTOR:
	202	case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */
	203	xen_vector = XEN_NMI_VECTOR;
	204	break;
	205	#endif
f447d56d BG	206	default:
	207	xen_vector = -1;
	208	printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
	209	vector);
	210	}
	211
	212	return xen_vector;
	213	}
	214
	215	void xen_send_IPI_mask(const struct cpumask *mask,
	216	int vector)
	217	{
	218	int xen_vector = xen_map_vector(vector);
	219
	220	if (xen_vector >= 0)
	221	__xen_send_IPI_mask(mask, xen_vector);
	222	}
	223
	224	void xen_send_IPI_all(int vector)
	225	{
	226	int xen_vector = xen_map_vector(vector);
	227
	228	if (xen_vector >= 0)
	229	__xen_send_IPI_mask(cpu_online_mask, xen_vector);
	230	}
	231
	232	void xen_send_IPI_self(int vector)
	233	{
	234	int xen_vector = xen_map_vector(vector);
	235
	236	if (xen_vector >= 0)
	237	xen_send_IPI_one(smp_processor_id(), xen_vector);
	238	}
	239
	240	void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
	241	int vector)
	242	{
	243	unsigned cpu;
	244	unsigned int this_cpu = smp_processor_id();
1db01b49	245	int xen_vector = xen_map_vector(vector);
f447d56d	246
1db01b49	247	if (!(num_online_cpus() > 1) \|\| (xen_vector < 0))
f447d56d BG	248	return;
	249
	250	for_each_cpu_and(cpu, mask, cpu_online_mask) {
	251	if (this_cpu == cpu)
	252	continue;
	253
1db01b49	254	xen_send_IPI_one(cpu, xen_vector);
f447d56d BG	255	}
	256	}
	257
	258	void xen_send_IPI_allbutself(int vector)
	259	{
1db01b49	260	xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
f447d56d BG	261	}
f447d56d BG	262
f87e4cac JF	263	static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
f87e4cac JF	264	{
f87e4cac	265	irq_enter();
3b16cf87	266	generic_smp_call_function_interrupt();
1b437c8c	267	inc_irq_stat(irq_call_count);
f87e4cac JF	268	irq_exit();
f87e4cac JF	269
f87e4cac JF	270	return IRQ_HANDLED;
	271	}
	272
3b16cf87	273	static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
f87e4cac	274	{
3b16cf87 JA	275	irq_enter();
3b16cf87 JA	276	generic_smp_call_function_single_interrupt();
1b437c8c	277	inc_irq_stat(irq_call_count);
3b16cf87	278	irq_exit();
f87e4cac	279
3b16cf87	280	return IRQ_HANDLED;
f87e4cac	281	}