[linux-block.git] / arch / powerpc / perf / hv-gpci.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Hypervisor supplied "gpci" ("get performance counter info") performance
 * counter support
 *
 * Author: Cody P Schafer <cody@linux.vnet.ibm.com>
 * Copyright 2014 IBM Corporation.
 */

#define pr_fmt(fmt) "hv-gpci: " fmt

#include <linux/init.h>
#include <linux/perf_event.h>
#include <asm/firmware.h>
#include <asm/hvcall.h>
#include <asm/io.h>

#include "hv-gpci.h"
#include "hv-common.h"

/*
 * Example usage:
 *  perf stat -e 'hv_gpci/counter_info_version=3,offset=0,length=8,
 *		  secondary_index=0,starting_index=0xffffffff,request=0x10/' ...
 */

/* u32 */
EVENT_DEFINE_RANGE_FORMAT(request, config, 0, 31);
/* u32 */
/*
 * Note that starting_index, phys_processor_idx, sibling_part_id,
 * hw_chip_id, partition_id all refer to the same bit range. They
 * are basically aliases for the starting_index. The specific alias
 * used depends on the event. See REQUEST_IDX_KIND in hv-gpci-requests.h
 */
EVENT_DEFINE_RANGE_FORMAT(starting_index, config, 32, 63);
EVENT_DEFINE_RANGE_FORMAT_LITE(phys_processor_idx, config, 32, 63);
EVENT_DEFINE_RANGE_FORMAT_LITE(sibling_part_id, config, 32, 63);
EVENT_DEFINE_RANGE_FORMAT_LITE(hw_chip_id, config, 32, 63);
EVENT_DEFINE_RANGE_FORMAT_LITE(partition_id, config, 32, 63);

/* u16 */
EVENT_DEFINE_RANGE_FORMAT(secondary_index, config1, 0, 15);
/* u8 */
EVENT_DEFINE_RANGE_FORMAT(counter_info_version, config1, 16, 23);
/* u8, bytes of data (1-8) */
EVENT_DEFINE_RANGE_FORMAT(length, config1, 24, 31);
/* u32, byte offset */
EVENT_DEFINE_RANGE_FORMAT(offset, config1, 32, 63);

static cpumask_t hv_gpci_cpumask;

static struct attribute *format_attrs[] = {
	&format_attr_request.attr,
	&format_attr_starting_index.attr,
	&format_attr_phys_processor_idx.attr,
	&format_attr_sibling_part_id.attr,
	&format_attr_hw_chip_id.attr,
	&format_attr_partition_id.attr,
	&format_attr_secondary_index.attr,
	&format_attr_counter_info_version.attr,

	&format_attr_offset.attr,
	&format_attr_length.attr,
	NULL,
};

static struct attribute_group format_group = {
	.name = "format",
	.attrs = format_attrs,
};

static struct attribute_group event_group = {
	.name  = "events",
	.attrs = hv_gpci_event_attrs,
};

#define HV_CAPS_ATTR(_name, _format)				\
static ssize_t _name##_show(struct device *dev,			\
			    struct device_attribute *attr,	\
			    char *page)				\
{								\
	struct hv_perf_caps caps;				\
	unsigned long hret = hv_perf_caps_get(&caps);		\
	if (hret)						\
		return -EIO;					\
								\
	return sprintf(page, _format, caps._name);		\
}								\
static struct device_attribute hv_caps_attr_##_name = __ATTR_RO(_name)

static ssize_t kernel_version_show(struct device *dev,
				   struct device_attribute *attr,
				   char *page)
{
	return sprintf(page, "0x%x\n", COUNTER_INFO_VERSION_CURRENT);
}

static ssize_t cpumask_show(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	return cpumap_print_to_pagebuf(true, buf, &hv_gpci_cpumask);
}

static DEVICE_ATTR_RO(kernel_version);
static DEVICE_ATTR_RO(cpumask);

HV_CAPS_ATTR(version, "0x%x\n");
HV_CAPS_ATTR(ga, "%d\n");
HV_CAPS_ATTR(expanded, "%d\n");
HV_CAPS_ATTR(lab, "%d\n");
HV_CAPS_ATTR(collect_privileged, "%d\n");

static struct attribute *interface_attrs[] = {
	&dev_attr_kernel_version.attr,
	&hv_caps_attr_version.attr,
	&hv_caps_attr_ga.attr,
	&hv_caps_attr_expanded.attr,
	&hv_caps_attr_lab.attr,
	&hv_caps_attr_collect_privileged.attr,
	NULL,
};

static struct attribute *cpumask_attrs[] = {
	&dev_attr_cpumask.attr,
	NULL,
};

static struct attribute_group cpumask_attr_group = {
	.attrs = cpumask_attrs,
};

static struct attribute_group interface_group = {
	.name = "interface",
	.attrs = interface_attrs,
};

static const struct attribute_group *attr_groups[] = {
	&format_group,
	&event_group,
	&interface_group,
	&cpumask_attr_group,
	NULL,
};

static DEFINE_PER_CPU(char, hv_gpci_reqb[HGPCI_REQ_BUFFER_SIZE]) __aligned(sizeof(uint64_t));

static unsigned long single_gpci_request(u32 req, u32 starting_index,
		u16 secondary_index, u8 version_in, u32 offset, u8 length,
		u64 *value)
{
	unsigned long ret;
	size_t i;
	u64 count;
	struct hv_gpci_request_buffer *arg;

	arg = (void *)get_cpu_var(hv_gpci_reqb);
	memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);

	arg->params.counter_request = cpu_to_be32(req);
	arg->params.starting_index = cpu_to_be32(starting_index);
	arg->params.secondary_index = cpu_to_be16(secondary_index);
	arg->params.counter_info_version_in = version_in;

	ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
			virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
	if (ret) {
		pr_devel("hcall failed: 0x%lx\n", ret);
		goto out;
	}

	/*
	 * we verify offset and length are within the zeroed buffer at event
	 * init.
	 */
	count = 0;
	for (i = offset; i < offset + length; i++)
		count |= arg->bytes[i] << (i - offset);

	*value = count;
out:
	put_cpu_var(hv_gpci_reqb);
	return ret;
}

static u64 h_gpci_get_value(struct perf_event *event)
{
	u64 count;
	unsigned long ret = single_gpci_request(event_get_request(event),
					event_get_starting_index(event),
					event_get_secondary_index(event),
					event_get_counter_info_version(event),
					event_get_offset(event),
					event_get_length(event),
					&count);
	if (ret)
		return 0;
	return count;
}

static void h_gpci_event_update(struct perf_event *event)
{
	s64 prev;
	u64 now = h_gpci_get_value(event);
	prev = local64_xchg(&event->hw.prev_count, now);
	local64_add(now - prev, &event->count);
}

static void h_gpci_event_start(struct perf_event *event, int flags)
{
	local64_set(&event->hw.prev_count, h_gpci_get_value(event));
}

static void h_gpci_event_stop(struct perf_event *event, int flags)
{
	h_gpci_event_update(event);
}

static int h_gpci_event_add(struct perf_event *event, int flags)
{
	if (flags & PERF_EF_START)
		h_gpci_event_start(event, flags);

	return 0;
}

static int h_gpci_event_init(struct perf_event *event)
{
	u64 count;
	u8 length;

	/* Not our event */
	if (event->attr.type != event->pmu->type)
		return -ENOENT;

	/* config2 is unused */
	if (event->attr.config2) {
		pr_devel("config2 set when reserved\n");
		return -EINVAL;
	}

	/* no branch sampling */
	if (has_branch_stack(event))
		return -EOPNOTSUPP;

	length = event_get_length(event);
	if (length < 1 || length > 8) {
		pr_devel("length invalid\n");
		return -EINVAL;
	}

	/* last byte within the buffer? */
	if ((event_get_offset(event) + length) > HGPCI_MAX_DATA_BYTES) {
		pr_devel("request outside of buffer: %zu > %zu\n",
				(size_t)event_get_offset(event) + length,
				HGPCI_MAX_DATA_BYTES);
		return -EINVAL;
	}

	/* check if the request works... */
	if (single_gpci_request(event_get_request(event),
				event_get_starting_index(event),
				event_get_secondary_index(event),
				event_get_counter_info_version(event),
				event_get_offset(event),
				length,
				&count)) {
		pr_devel("gpci hcall failed\n");
		return -EINVAL;
	}

	return 0;
}

static struct pmu h_gpci_pmu = {
	.task_ctx_nr = perf_invalid_context,

	.name = "hv_gpci",
	.attr_groups = attr_groups,
	.event_init  = h_gpci_event_init,
	.add         = h_gpci_event_add,
	.del         = h_gpci_event_stop,
	.start       = h_gpci_event_start,
	.stop        = h_gpci_event_stop,
	.read        = h_gpci_event_update,
	.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
};

static int ppc_hv_gpci_cpu_online(unsigned int cpu)
{
	if (cpumask_empty(&hv_gpci_cpumask))
		cpumask_set_cpu(cpu, &hv_gpci_cpumask);

	return 0;
}

static int ppc_hv_gpci_cpu_offline(unsigned int cpu)
{
	int target;

	/* Check if exiting cpu is used for collecting gpci events */
	if (!cpumask_test_and_clear_cpu(cpu, &hv_gpci_cpumask))
		return 0;

	/* Find a new cpu to collect gpci events */
	target = cpumask_last(cpu_active_mask);

	if (target < 0 || target >= nr_cpu_ids) {
		pr_err("hv_gpci: CPU hotplug init failed\n");
		return -1;
	}

	/* Migrate gpci events to the new target */
	cpumask_set_cpu(target, &hv_gpci_cpumask);
	perf_pmu_migrate_context(&h_gpci_pmu, cpu, target);

	return 0;
}

static int hv_gpci_cpu_hotplug_init(void)
{
	return cpuhp_setup_state(CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE,
			  "perf/powerpc/hv_gcpi:online",
			  ppc_hv_gpci_cpu_online,
			  ppc_hv_gpci_cpu_offline);
}

static int hv_gpci_init(void)
{
	int r;
	unsigned long hret;
	struct hv_perf_caps caps;

	hv_gpci_assert_offsets_correct();

	if (!firmware_has_feature(FW_FEATURE_LPAR)) {
		pr_debug("not a virtualized system, not enabling\n");
		return -ENODEV;
	}

	hret = hv_perf_caps_get(&caps);
	if (hret) {
		pr_debug("could not obtain capabilities, not enabling, rc=%ld\n",
				hret);
		return -ENODEV;
	}

	/* init cpuhotplug */
	r = hv_gpci_cpu_hotplug_init();
	if (r)
		return r;

	/* sampling not supported */
	h_gpci_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;

	r = perf_pmu_register(&h_gpci_pmu, h_gpci_pmu.name, -1);
	if (r)
		return r;

	return 0;
}

device_initcall(hv_gpci_init);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
220a0c60 CS	2	/*
	3	* Hypervisor supplied "gpci" ("get performance counter info") performance
	4	* counter support
	5	*
	6	* Author: Cody P Schafer <cody@linux.vnet.ibm.com>
	7	* Copyright 2014 IBM Corporation.
220a0c60 CS	8	*/
	9
	10	#define pr_fmt(fmt) "hv-gpci: " fmt
	11
	12	#include <linux/init.h>
	13	#include <linux/perf_event.h>
	14	#include <asm/firmware.h>
	15	#include <asm/hvcall.h>
	16	#include <asm/io.h>
	17
	18	#include "hv-gpci.h"
	19	#include "hv-common.h"
	20
	21	/*
	22	* Example usage:
	23	* perf stat -e 'hv_gpci/counter_info_version=3,offset=0,length=8,
	24	* secondary_index=0,starting_index=0xffffffff,request=0x10/' ...
	25	*/
	26
	27	/* u32 */
	28	EVENT_DEFINE_RANGE_FORMAT(request, config, 0, 31);
	29	/* u32 */
9e9f6010 CS	30	/*
	31	* Note that starting_index, phys_processor_idx, sibling_part_id,
	32	* hw_chip_id, partition_id all refer to the same bit range. They
	33	* are basically aliases for the starting_index. The specific alias
	34	* used depends on the event. See REQUEST_IDX_KIND in hv-gpci-requests.h
	35	*/
220a0c60	36	EVENT_DEFINE_RANGE_FORMAT(starting_index, config, 32, 63);
9e9f6010 CS	37	EVENT_DEFINE_RANGE_FORMAT_LITE(phys_processor_idx, config, 32, 63);
	38	EVENT_DEFINE_RANGE_FORMAT_LITE(sibling_part_id, config, 32, 63);
	39	EVENT_DEFINE_RANGE_FORMAT_LITE(hw_chip_id, config, 32, 63);
	40	EVENT_DEFINE_RANGE_FORMAT_LITE(partition_id, config, 32, 63);
	41
220a0c60 CS	42	/* u16 */
	43	EVENT_DEFINE_RANGE_FORMAT(secondary_index, config1, 0, 15);
	44	/* u8 */
	45	EVENT_DEFINE_RANGE_FORMAT(counter_info_version, config1, 16, 23);
	46	/* u8, bytes of data (1-8) */
	47	EVENT_DEFINE_RANGE_FORMAT(length, config1, 24, 31);
	48	/* u32, byte offset */
	49	EVENT_DEFINE_RANGE_FORMAT(offset, config1, 32, 63);
	50
dcb5cdf6 KJ	51	static cpumask_t hv_gpci_cpumask;
dcb5cdf6 KJ	52
220a0c60 CS	53	static struct attribute *format_attrs[] = {
	54	&format_attr_request.attr,
	55	&format_attr_starting_index.attr,
9e9f6010 CS	56	&format_attr_phys_processor_idx.attr,
	57	&format_attr_sibling_part_id.attr,
	58	&format_attr_hw_chip_id.attr,
	59	&format_attr_partition_id.attr,
220a0c60 CS	60	&format_attr_secondary_index.attr,
	61	&format_attr_counter_info_version.attr,
	62
	63	&format_attr_offset.attr,
	64	&format_attr_length.attr,
	65	NULL,
	66	};
	67
	68	static struct attribute_group format_group = {
	69	.name = "format",
	70	.attrs = format_attrs,
	71	};
	72
9e9f6010 CS	73	static struct attribute_group event_group = {
	74	.name = "events",
	75	.attrs = hv_gpci_event_attrs,
	76	};
	77
220a0c60 CS	78	#define HV_CAPS_ATTR(_name, _format) \
	79	static ssize_t _name##_show(struct device *dev, \
	80	struct device_attribute *attr, \
	81	char *page) \
	82	{ \
	83	struct hv_perf_caps caps; \
	84	unsigned long hret = hv_perf_caps_get(&caps); \
	85	if (hret) \
	86	return -EIO; \
	87	\
	88	return sprintf(page, _format, caps._name); \
	89	} \
	90	static struct device_attribute hv_caps_attr_##_name = __ATTR_RO(_name)
	91
	92	static ssize_t kernel_version_show(struct device *dev,
	93	struct device_attribute *attr,
	94	char *page)
	95	{
	96	return sprintf(page, "0x%x\n", COUNTER_INFO_VERSION_CURRENT);
	97	}
	98
09b791d9 KJ	99	static ssize_t cpumask_show(struct device *dev,
	100	struct device_attribute attr, char buf)
	101	{
	102	return cpumap_print_to_pagebuf(true, buf, &hv_gpci_cpumask);
	103	}
	104
58a685c2	105	static DEVICE_ATTR_RO(kernel_version);
09b791d9 KJ	106	static DEVICE_ATTR_RO(cpumask);
09b791d9 KJ	107
220a0c60 CS	108	HV_CAPS_ATTR(version, "0x%x\n");
	109	HV_CAPS_ATTR(ga, "%d\n");
	110	HV_CAPS_ATTR(expanded, "%d\n");
	111	HV_CAPS_ATTR(lab, "%d\n");
	112	HV_CAPS_ATTR(collect_privileged, "%d\n");
	113
	114	static struct attribute *interface_attrs[] = {
	115	&dev_attr_kernel_version.attr,
	116	&hv_caps_attr_version.attr,
	117	&hv_caps_attr_ga.attr,
	118	&hv_caps_attr_expanded.attr,
	119	&hv_caps_attr_lab.attr,
	120	&hv_caps_attr_collect_privileged.attr,
	121	NULL,
	122	};
	123
09b791d9 KJ	124	static struct attribute *cpumask_attrs[] = {
	125	&dev_attr_cpumask.attr,
	126	NULL,
	127	};
	128
	129	static struct attribute_group cpumask_attr_group = {
	130	.attrs = cpumask_attrs,
	131	};
	132
220a0c60 CS	133	static struct attribute_group interface_group = {
	134	.name = "interface",
	135	.attrs = interface_attrs,
	136	};
	137
	138	static const struct attribute_group *attr_groups[] = {
	139	&format_group,
9e9f6010	140	&event_group,
220a0c60	141	&interface_group,
09b791d9	142	&cpumask_attr_group,
220a0c60 CS	143	NULL,
	144	};
	145
7c98bd72	146	static DEFINE_PER_CPU(char, hv_gpci_reqb[HGPCI_REQ_BUFFER_SIZE]) __aligned(sizeof(uint64_t));
e4f226b1	147
220a0c60 CS	148	static unsigned long single_gpci_request(u32 req, u32 starting_index,
	149	u16 secondary_index, u8 version_in, u32 offset, u8 length,
	150	u64 *value)
	151	{
	152	unsigned long ret;
	153	size_t i;
	154	u64 count;
e4f226b1 SB	155	struct hv_gpci_request_buffer *arg;
	156
	157	arg = (void *)get_cpu_var(hv_gpci_reqb);
	158	memset(arg, 0, HGPCI_REQ_BUFFER_SIZE);
220a0c60	159
e4f226b1 SB	160	arg->params.counter_request = cpu_to_be32(req);
	161	arg->params.starting_index = cpu_to_be32(starting_index);
	162	arg->params.secondary_index = cpu_to_be16(secondary_index);
	163	arg->params.counter_info_version_in = version_in;
220a0c60 CS	164
220a0c60 CS	165	ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
e4f226b1	166	virt_to_phys(arg), HGPCI_REQ_BUFFER_SIZE);
220a0c60 CS	167	if (ret) {
220a0c60 CS	168	pr_devel("hcall failed: 0x%lx\n", ret);
e4f226b1	169	goto out;
220a0c60 CS	170	}
	171
	172	/*
	173	* we verify offset and length are within the zeroed buffer at event
	174	* init.
	175	*/
	176	count = 0;
	177	for (i = offset; i < offset + length; i++)
e4f226b1	178	count \|= arg->bytes[i] << (i - offset);
220a0c60 CS	179
220a0c60 CS	180	*value = count;
e4f226b1 SB	181	out:
e4f226b1 SB	182	put_cpu_var(hv_gpci_reqb);
220a0c60 CS	183	return ret;
	184	}
	185
	186	static u64 h_gpci_get_value(struct perf_event *event)
	187	{
	188	u64 count;
	189	unsigned long ret = single_gpci_request(event_get_request(event),
	190	event_get_starting_index(event),
	191	event_get_secondary_index(event),
	192	event_get_counter_info_version(event),
	193	event_get_offset(event),
	194	event_get_length(event),
	195	&count);
	196	if (ret)
	197	return 0;
	198	return count;
	199	}
	200
	201	static void h_gpci_event_update(struct perf_event *event)
	202	{
	203	s64 prev;
	204	u64 now = h_gpci_get_value(event);
	205	prev = local64_xchg(&event->hw.prev_count, now);
	206	local64_add(now - prev, &event->count);
	207	}
	208
	209	static void h_gpci_event_start(struct perf_event *event, int flags)
	210	{
	211	local64_set(&event->hw.prev_count, h_gpci_get_value(event));
	212	}
	213
	214	static void h_gpci_event_stop(struct perf_event *event, int flags)
	215	{
	216	h_gpci_event_update(event);
	217	}
	218
	219	static int h_gpci_event_add(struct perf_event *event, int flags)
	220	{
	221	if (flags & PERF_EF_START)
	222	h_gpci_event_start(event, flags);
	223
	224	return 0;
	225	}
	226
	227	static int h_gpci_event_init(struct perf_event *event)
	228	{
	229	u64 count;
	230	u8 length;
	231
	232	/* Not our event */
	233	if (event->attr.type != event->pmu->type)
	234	return -ENOENT;
	235
	236	/* config2 is unused */
	237	if (event->attr.config2) {
	238	pr_devel("config2 set when reserved\n");
	239	return -EINVAL;
	240	}
	241
220a0c60 CS	242	/* no branch sampling */
	243	if (has_branch_stack(event))
	244	return -EOPNOTSUPP;
	245
	246	length = event_get_length(event);
	247	if (length < 1 \|\| length > 8) {
	248	pr_devel("length invalid\n");
	249	return -EINVAL;
	250	}
	251
	252	/* last byte within the buffer? */
e4f226b1	253	if ((event_get_offset(event) + length) > HGPCI_MAX_DATA_BYTES) {
220a0c60 CS	254	pr_devel("request outside of buffer: %zu > %zu\n",
220a0c60 CS	255	(size_t)event_get_offset(event) + length,
e4f226b1	256	HGPCI_MAX_DATA_BYTES);
220a0c60 CS	257	return -EINVAL;
	258	}
	259
	260	/* check if the request works... */
	261	if (single_gpci_request(event_get_request(event),
	262	event_get_starting_index(event),
	263	event_get_secondary_index(event),
	264	event_get_counter_info_version(event),
	265	event_get_offset(event),
	266	length,
	267	&count)) {
	268	pr_devel("gpci hcall failed\n");
	269	return -EINVAL;
	270	}
	271
	272	return 0;
	273	}
	274
220a0c60 CS	275	static struct pmu h_gpci_pmu = {
	276	.task_ctx_nr = perf_invalid_context,
	277
	278	.name = "hv_gpci",
	279	.attr_groups = attr_groups,
	280	.event_init = h_gpci_event_init,
	281	.add = h_gpci_event_add,
	282	.del = h_gpci_event_stop,
	283	.start = h_gpci_event_start,
	284	.stop = h_gpci_event_stop,
	285	.read = h_gpci_event_update,
c2c9091d	286	.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
220a0c60 CS	287	};
220a0c60 CS	288
dcb5cdf6 KJ	289	static int ppc_hv_gpci_cpu_online(unsigned int cpu)
	290	{
	291	if (cpumask_empty(&hv_gpci_cpumask))
	292	cpumask_set_cpu(cpu, &hv_gpci_cpumask);
	293
	294	return 0;
	295	}
	296
	297	static int ppc_hv_gpci_cpu_offline(unsigned int cpu)
	298	{
	299	int target;
	300
	301	/* Check if exiting cpu is used for collecting gpci events */
	302	if (!cpumask_test_and_clear_cpu(cpu, &hv_gpci_cpumask))
	303	return 0;
	304
	305	/* Find a new cpu to collect gpci events */
	306	target = cpumask_last(cpu_active_mask);
	307
	308	if (target < 0 \|\| target >= nr_cpu_ids) {
	309	pr_err("hv_gpci: CPU hotplug init failed\n");
	310	return -1;
	311	}
	312
	313	/* Migrate gpci events to the new target */
	314	cpumask_set_cpu(target, &hv_gpci_cpumask);
	315	perf_pmu_migrate_context(&h_gpci_pmu, cpu, target);
	316
	317	return 0;
	318	}
	319
	320	static int hv_gpci_cpu_hotplug_init(void)
	321	{
	322	return cpuhp_setup_state(CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE,
	323	"perf/powerpc/hv_gcpi:online",
	324	ppc_hv_gpci_cpu_online,
	325	ppc_hv_gpci_cpu_offline);
	326	}
	327
220a0c60 CS	328	static int hv_gpci_init(void)
	329	{
	330	int r;
	331	unsigned long hret;
	332	struct hv_perf_caps caps;
	333
9e9f6010 CS	334	hv_gpci_assert_offsets_correct();
9e9f6010 CS	335
220a0c60	336	if (!firmware_has_feature(FW_FEATURE_LPAR)) {
0a8cf9e2	337	pr_debug("not a virtualized system, not enabling\n");
220a0c60 CS	338	return -ENODEV;
	339	}
	340
	341	hret = hv_perf_caps_get(&caps);
	342	if (hret) {
0a8cf9e2	343	pr_debug("could not obtain capabilities, not enabling, rc=%ld\n",
220a0c60 CS	344	hret);
	345	return -ENODEV;
	346	}
	347
dcb5cdf6 KJ	348	/* init cpuhotplug */
	349	r = hv_gpci_cpu_hotplug_init();
	350	if (r)
	351	return r;
	352
cc56d673 VW	353	/* sampling not supported */
	354	h_gpci_pmu.capabilities \|= PERF_PMU_CAP_NO_INTERRUPT;
	355
220a0c60 CS	356	r = perf_pmu_register(&h_gpci_pmu, h_gpci_pmu.name, -1);
	357	if (r)
	358	return r;
	359
	360	return 0;
	361	}
	362
	363	device_initcall(hv_gpci_init);