1634 lines
41 KiB
C
Executable File
1634 lines
41 KiB
C
Executable File
/*
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* Hypervisor supplied "24x7" performance counter support
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*
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* Author: Cody P Schafer <cody@linux.vnet.ibm.com>
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* Copyright 2014 IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) "hv-24x7: " fmt
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#include <linux/perf_event.h>
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#include <linux/rbtree.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <asm/cputhreads.h>
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#include <asm/firmware.h>
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#include <asm/hvcall.h>
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#include <asm/io.h>
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#include <linux/byteorder/generic.h>
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#include "hv-24x7.h"
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#include "hv-24x7-catalog.h"
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#include "hv-common.h"
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/* Version of the 24x7 hypervisor API that we should use in this machine. */
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static int interface_version;
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/* Whether we have to aggregate result data for some domains. */
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static bool aggregate_result_elements;
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static bool domain_is_valid(unsigned domain)
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{
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switch (domain) {
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#define DOMAIN(n, v, x, c) \
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case HV_PERF_DOMAIN_##n: \
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/* fall through */
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#include "hv-24x7-domains.h"
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#undef DOMAIN
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return true;
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default:
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return false;
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}
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}
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static bool is_physical_domain(unsigned domain)
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{
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switch (domain) {
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#define DOMAIN(n, v, x, c) \
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case HV_PERF_DOMAIN_##n: \
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return c;
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#include "hv-24x7-domains.h"
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#undef DOMAIN
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default:
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return false;
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}
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}
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/* Domains for which more than one result element are returned for each event. */
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static bool domain_needs_aggregation(unsigned int domain)
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{
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return aggregate_result_elements &&
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(domain == HV_PERF_DOMAIN_PHYS_CORE ||
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(domain >= HV_PERF_DOMAIN_VCPU_HOME_CORE &&
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domain <= HV_PERF_DOMAIN_VCPU_REMOTE_NODE));
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}
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static const char *domain_name(unsigned domain)
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{
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if (!domain_is_valid(domain))
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return NULL;
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switch (domain) {
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case HV_PERF_DOMAIN_PHYS_CHIP: return "Physical Chip";
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case HV_PERF_DOMAIN_PHYS_CORE: return "Physical Core";
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case HV_PERF_DOMAIN_VCPU_HOME_CORE: return "VCPU Home Core";
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case HV_PERF_DOMAIN_VCPU_HOME_CHIP: return "VCPU Home Chip";
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case HV_PERF_DOMAIN_VCPU_HOME_NODE: return "VCPU Home Node";
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case HV_PERF_DOMAIN_VCPU_REMOTE_NODE: return "VCPU Remote Node";
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}
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WARN_ON_ONCE(domain);
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return NULL;
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}
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static bool catalog_entry_domain_is_valid(unsigned domain)
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{
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/* POWER8 doesn't support virtual domains. */
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if (interface_version == 1)
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return is_physical_domain(domain);
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else
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return domain_is_valid(domain);
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}
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/*
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* TODO: Merging events:
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* - Think of the hcall as an interface to a 4d array of counters:
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* - x = domains
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* - y = indexes in the domain (core, chip, vcpu, node, etc)
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* - z = offset into the counter space
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* - w = lpars (guest vms, "logical partitions")
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* - A single request is: x,y,y_last,z,z_last,w,w_last
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* - this means we can retrieve a rectangle of counters in y,z for a single x.
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*
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* - Things to consider (ignoring w):
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* - input cost_per_request = 16
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* - output cost_per_result(ys,zs) = 8 + 8 * ys + ys * zs
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* - limited number of requests per hcall (must fit into 4K bytes)
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* - 4k = 16 [buffer header] - 16 [request size] * request_count
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* - 255 requests per hcall
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* - sometimes it will be more efficient to read extra data and discard
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*/
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/*
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* Example usage:
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* perf stat -e 'hv_24x7/domain=2,offset=8,vcpu=0,lpar=0xffffffff/'
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*/
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/* u3 0-6, one of HV_24X7_PERF_DOMAIN */
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EVENT_DEFINE_RANGE_FORMAT(domain, config, 0, 3);
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/* u16 */
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EVENT_DEFINE_RANGE_FORMAT(core, config, 16, 31);
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EVENT_DEFINE_RANGE_FORMAT(chip, config, 16, 31);
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EVENT_DEFINE_RANGE_FORMAT(vcpu, config, 16, 31);
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/* u32, see "data_offset" */
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EVENT_DEFINE_RANGE_FORMAT(offset, config, 32, 63);
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/* u16 */
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EVENT_DEFINE_RANGE_FORMAT(lpar, config1, 0, 15);
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EVENT_DEFINE_RANGE(reserved1, config, 4, 15);
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EVENT_DEFINE_RANGE(reserved2, config1, 16, 63);
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EVENT_DEFINE_RANGE(reserved3, config2, 0, 63);
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static struct attribute *format_attrs[] = {
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&format_attr_domain.attr,
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&format_attr_offset.attr,
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&format_attr_core.attr,
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&format_attr_chip.attr,
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&format_attr_vcpu.attr,
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&format_attr_lpar.attr,
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NULL,
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};
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static struct attribute_group format_group = {
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.name = "format",
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.attrs = format_attrs,
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};
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static struct attribute_group event_group = {
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.name = "events",
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/* .attrs is set in init */
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};
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static struct attribute_group event_desc_group = {
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.name = "event_descs",
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/* .attrs is set in init */
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};
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static struct attribute_group event_long_desc_group = {
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.name = "event_long_descs",
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/* .attrs is set in init */
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};
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static struct kmem_cache *hv_page_cache;
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DEFINE_PER_CPU(int, hv_24x7_txn_flags);
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DEFINE_PER_CPU(int, hv_24x7_txn_err);
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struct hv_24x7_hw {
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struct perf_event *events[255];
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};
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DEFINE_PER_CPU(struct hv_24x7_hw, hv_24x7_hw);
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/*
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* request_buffer and result_buffer are not required to be 4k aligned,
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* but are not allowed to cross any 4k boundary. Aligning them to 4k is
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* the simplest way to ensure that.
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*/
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#define H24x7_DATA_BUFFER_SIZE 4096
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DEFINE_PER_CPU(char, hv_24x7_reqb[H24x7_DATA_BUFFER_SIZE]) __aligned(4096);
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DEFINE_PER_CPU(char, hv_24x7_resb[H24x7_DATA_BUFFER_SIZE]) __aligned(4096);
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static unsigned int max_num_requests(int interface_version)
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{
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return (H24x7_DATA_BUFFER_SIZE - sizeof(struct hv_24x7_request_buffer))
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/ H24x7_REQUEST_SIZE(interface_version);
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}
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static char *event_name(struct hv_24x7_event_data *ev, int *len)
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{
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*len = be16_to_cpu(ev->event_name_len) - 2;
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return (char *)ev->remainder;
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}
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static char *event_desc(struct hv_24x7_event_data *ev, int *len)
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{
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unsigned nl = be16_to_cpu(ev->event_name_len);
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__be16 *desc_len = (__be16 *)(ev->remainder + nl - 2);
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*len = be16_to_cpu(*desc_len) - 2;
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return (char *)ev->remainder + nl;
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}
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static char *event_long_desc(struct hv_24x7_event_data *ev, int *len)
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{
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unsigned nl = be16_to_cpu(ev->event_name_len);
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__be16 *desc_len_ = (__be16 *)(ev->remainder + nl - 2);
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unsigned desc_len = be16_to_cpu(*desc_len_);
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__be16 *long_desc_len = (__be16 *)(ev->remainder + nl + desc_len - 2);
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*len = be16_to_cpu(*long_desc_len) - 2;
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return (char *)ev->remainder + nl + desc_len;
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}
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static bool event_fixed_portion_is_within(struct hv_24x7_event_data *ev,
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void *end)
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{
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void *start = ev;
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return (start + offsetof(struct hv_24x7_event_data, remainder)) < end;
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}
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/*
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* Things we don't check:
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* - padding for desc, name, and long/detailed desc is required to be '\0'
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* bytes.
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*
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* Return NULL if we pass end,
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* Otherwise return the address of the byte just following the event.
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*/
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static void *event_end(struct hv_24x7_event_data *ev, void *end)
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{
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void *start = ev;
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__be16 *dl_, *ldl_;
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unsigned dl, ldl;
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unsigned nl = be16_to_cpu(ev->event_name_len);
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if (nl < 2) {
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pr_debug("%s: name length too short: %d", __func__, nl);
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return NULL;
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}
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if (start + nl > end) {
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pr_debug("%s: start=%p + nl=%u > end=%p",
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__func__, start, nl, end);
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return NULL;
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}
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dl_ = (__be16 *)(ev->remainder + nl - 2);
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if (!IS_ALIGNED((uintptr_t)dl_, 2))
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pr_warn("desc len not aligned %p", dl_);
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dl = be16_to_cpu(*dl_);
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if (dl < 2) {
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pr_debug("%s: desc len too short: %d", __func__, dl);
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return NULL;
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}
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if (start + nl + dl > end) {
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pr_debug("%s: (start=%p + nl=%u + dl=%u)=%p > end=%p",
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__func__, start, nl, dl, start + nl + dl, end);
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return NULL;
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}
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ldl_ = (__be16 *)(ev->remainder + nl + dl - 2);
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if (!IS_ALIGNED((uintptr_t)ldl_, 2))
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pr_warn("long desc len not aligned %p", ldl_);
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ldl = be16_to_cpu(*ldl_);
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if (ldl < 2) {
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pr_debug("%s: long desc len too short (ldl=%u)",
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__func__, ldl);
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return NULL;
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}
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if (start + nl + dl + ldl > end) {
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pr_debug("%s: start=%p + nl=%u + dl=%u + ldl=%u > end=%p",
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__func__, start, nl, dl, ldl, end);
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return NULL;
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}
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return start + nl + dl + ldl;
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}
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static long h_get_24x7_catalog_page_(unsigned long phys_4096,
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unsigned long version, unsigned long index)
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{
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pr_devel("h_get_24x7_catalog_page(0x%lx, %lu, %lu)",
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phys_4096, version, index);
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WARN_ON(!IS_ALIGNED(phys_4096, 4096));
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return plpar_hcall_norets(H_GET_24X7_CATALOG_PAGE,
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phys_4096, version, index);
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}
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static long h_get_24x7_catalog_page(char page[], u64 version, u32 index)
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{
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return h_get_24x7_catalog_page_(virt_to_phys(page),
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version, index);
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}
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/*
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* Each event we find in the catalog, will have a sysfs entry. Format the
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* data for this sysfs entry based on the event's domain.
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*
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* Events belonging to the Chip domain can only be monitored in that domain.
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* i.e the domain for these events is a fixed/knwon value.
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*
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* Events belonging to the Core domain can be monitored either in the physical
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* core or in one of the virtual CPU domains. So the domain value for these
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* events must be specified by the user (i.e is a required parameter). Format
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* the Core events with 'domain=?' so the perf-tool can error check required
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* parameters.
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*
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* NOTE: For the Core domain events, rather than making domain a required
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* parameter we could default it to PHYS_CORE and allowe users to
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* override the domain to one of the VCPU domains.
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*
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* However, this can make the interface a little inconsistent.
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*
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* If we set domain=2 (PHYS_CHIP) and allow user to override this field
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* the user may be tempted to also modify the "offset=x" field in which
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* can lead to confusing usage. Consider the HPM_PCYC (offset=0x18) and
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* HPM_INST (offset=0x20) events. With:
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*
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* perf stat -e hv_24x7/HPM_PCYC,offset=0x20/
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*
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* we end up monitoring HPM_INST, while the command line has HPM_PCYC.
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*
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* By not assigning a default value to the domain for the Core events,
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* we can have simple guidelines:
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*
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* - Specifying values for parameters with "=?" is required.
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*
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* - Specifying (i.e overriding) values for other parameters
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* is undefined.
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*/
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static char *event_fmt(struct hv_24x7_event_data *event, unsigned domain)
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{
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const char *sindex;
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const char *lpar;
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const char *domain_str;
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char buf[8];
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switch (domain) {
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case HV_PERF_DOMAIN_PHYS_CHIP:
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snprintf(buf, sizeof(buf), "%d", domain);
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domain_str = buf;
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lpar = "0x0";
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sindex = "chip";
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break;
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case HV_PERF_DOMAIN_PHYS_CORE:
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domain_str = "?";
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lpar = "0x0";
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sindex = "core";
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break;
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default:
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domain_str = "?";
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lpar = "?";
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sindex = "vcpu";
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}
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return kasprintf(GFP_KERNEL,
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"domain=%s,offset=0x%x,%s=?,lpar=%s",
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domain_str,
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be16_to_cpu(event->event_counter_offs) +
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be16_to_cpu(event->event_group_record_offs),
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sindex,
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lpar);
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}
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/* Avoid trusting fw to NUL terminate strings */
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static char *memdup_to_str(char *maybe_str, int max_len, gfp_t gfp)
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{
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return kasprintf(gfp, "%.*s", max_len, maybe_str);
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}
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static ssize_t device_show_string(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dev_ext_attribute *d;
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d = container_of(attr, struct dev_ext_attribute, attr);
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return sprintf(buf, "%s\n", (char *)d->var);
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}
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static struct attribute *device_str_attr_create_(char *name, char *str)
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{
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struct dev_ext_attribute *attr = kzalloc(sizeof(*attr), GFP_KERNEL);
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if (!attr)
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return NULL;
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sysfs_attr_init(&attr->attr.attr);
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attr->var = str;
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attr->attr.attr.name = name;
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attr->attr.attr.mode = 0444;
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attr->attr.show = device_show_string;
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return &attr->attr.attr;
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}
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|
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/*
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* Allocate and initialize strings representing event attributes.
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*
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* NOTE: The strings allocated here are never destroyed and continue to
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* exist till shutdown. This is to allow us to create as many events
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* from the catalog as possible, even if we encounter errors with some.
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* In case of changes to error paths in future, these may need to be
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* freed by the caller.
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*/
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static struct attribute *device_str_attr_create(char *name, int name_max,
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int name_nonce,
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char *str, size_t str_max)
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{
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char *n;
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char *s = memdup_to_str(str, str_max, GFP_KERNEL);
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struct attribute *a;
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|
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if (!s)
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return NULL;
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|
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if (!name_nonce)
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n = kasprintf(GFP_KERNEL, "%.*s", name_max, name);
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else
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n = kasprintf(GFP_KERNEL, "%.*s__%d", name_max, name,
|
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name_nonce);
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if (!n)
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goto out_s;
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a = device_str_attr_create_(n, s);
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if (!a)
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goto out_n;
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return a;
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out_n:
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kfree(n);
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out_s:
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kfree(s);
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return NULL;
|
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}
|
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|
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static struct attribute *event_to_attr(unsigned ix,
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struct hv_24x7_event_data *event,
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unsigned domain,
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int nonce)
|
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{
|
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int event_name_len;
|
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char *ev_name, *a_ev_name, *val;
|
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struct attribute *attr;
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|
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if (!domain_is_valid(domain)) {
|
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pr_warn("catalog event %u has invalid domain %u\n",
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ix, domain);
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return NULL;
|
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}
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|
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val = event_fmt(event, domain);
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if (!val)
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return NULL;
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|
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ev_name = event_name(event, &event_name_len);
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if (!nonce)
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a_ev_name = kasprintf(GFP_KERNEL, "%.*s",
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(int)event_name_len, ev_name);
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else
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a_ev_name = kasprintf(GFP_KERNEL, "%.*s__%d",
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(int)event_name_len, ev_name, nonce);
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|
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if (!a_ev_name)
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goto out_val;
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attr = device_str_attr_create_(a_ev_name, val);
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if (!attr)
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goto out_name;
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|
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return attr;
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out_name:
|
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kfree(a_ev_name);
|
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out_val:
|
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kfree(val);
|
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return NULL;
|
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}
|
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|
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static struct attribute *event_to_desc_attr(struct hv_24x7_event_data *event,
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int nonce)
|
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{
|
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int nl, dl;
|
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char *name = event_name(event, &nl);
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char *desc = event_desc(event, &dl);
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|
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/* If there isn't a description, don't create the sysfs file */
|
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if (!dl)
|
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return NULL;
|
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|
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return device_str_attr_create(name, nl, nonce, desc, dl);
|
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}
|
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|
|
static struct attribute *
|
|
event_to_long_desc_attr(struct hv_24x7_event_data *event, int nonce)
|
|
{
|
|
int nl, dl;
|
|
char *name = event_name(event, &nl);
|
|
char *desc = event_long_desc(event, &dl);
|
|
|
|
/* If there isn't a description, don't create the sysfs file */
|
|
if (!dl)
|
|
return NULL;
|
|
|
|
return device_str_attr_create(name, nl, nonce, desc, dl);
|
|
}
|
|
|
|
static int event_data_to_attrs(unsigned ix, struct attribute **attrs,
|
|
struct hv_24x7_event_data *event, int nonce)
|
|
{
|
|
*attrs = event_to_attr(ix, event, event->domain, nonce);
|
|
if (!*attrs)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* */
|
|
struct event_uniq {
|
|
struct rb_node node;
|
|
const char *name;
|
|
int nl;
|
|
unsigned ct;
|
|
unsigned domain;
|
|
};
|
|
|
|
static int memord(const void *d1, size_t s1, const void *d2, size_t s2)
|
|
{
|
|
if (s1 < s2)
|
|
return 1;
|
|
if (s1 > s2)
|
|
return -1;
|
|
|
|
return memcmp(d1, d2, s1);
|
|
}
|
|
|
|
static int ev_uniq_ord(const void *v1, size_t s1, unsigned d1, const void *v2,
|
|
size_t s2, unsigned d2)
|
|
{
|
|
int r = memord(v1, s1, v2, s2);
|
|
|
|
if (r)
|
|
return r;
|
|
if (d1 > d2)
|
|
return 1;
|
|
if (d2 > d1)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static int event_uniq_add(struct rb_root *root, const char *name, int nl,
|
|
unsigned domain)
|
|
{
|
|
struct rb_node **new = &(root->rb_node), *parent = NULL;
|
|
struct event_uniq *data;
|
|
|
|
/* Figure out where to put new node */
|
|
while (*new) {
|
|
struct event_uniq *it;
|
|
int result;
|
|
|
|
it = container_of(*new, struct event_uniq, node);
|
|
result = ev_uniq_ord(name, nl, domain, it->name, it->nl,
|
|
it->domain);
|
|
|
|
parent = *new;
|
|
if (result < 0)
|
|
new = &((*new)->rb_left);
|
|
else if (result > 0)
|
|
new = &((*new)->rb_right);
|
|
else {
|
|
it->ct++;
|
|
pr_info("found a duplicate event %.*s, ct=%u\n", nl,
|
|
name, it->ct);
|
|
return it->ct;
|
|
}
|
|
}
|
|
|
|
data = kmalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
*data = (struct event_uniq) {
|
|
.name = name,
|
|
.nl = nl,
|
|
.ct = 0,
|
|
.domain = domain,
|
|
};
|
|
|
|
/* Add new node and rebalance tree. */
|
|
rb_link_node(&data->node, parent, new);
|
|
rb_insert_color(&data->node, root);
|
|
|
|
/* data->ct */
|
|
return 0;
|
|
}
|
|
|
|
static void event_uniq_destroy(struct rb_root *root)
|
|
{
|
|
/*
|
|
* the strings we point to are in the giant block of memory filled by
|
|
* the catalog, and are freed separately.
|
|
*/
|
|
struct event_uniq *pos, *n;
|
|
|
|
rbtree_postorder_for_each_entry_safe(pos, n, root, node)
|
|
kfree(pos);
|
|
}
|
|
|
|
|
|
/*
|
|
* ensure the event structure's sizes are self consistent and don't cause us to
|
|
* read outside of the event
|
|
*
|
|
* On success, return the event length in bytes.
|
|
* Otherwise, return -1 (and print as appropriate).
|
|
*/
|
|
static ssize_t catalog_event_len_validate(struct hv_24x7_event_data *event,
|
|
size_t event_idx,
|
|
size_t event_data_bytes,
|
|
size_t event_entry_count,
|
|
size_t offset, void *end)
|
|
{
|
|
ssize_t ev_len;
|
|
void *ev_end, *calc_ev_end;
|
|
|
|
if (offset >= event_data_bytes)
|
|
return -1;
|
|
|
|
if (event_idx >= event_entry_count) {
|
|
pr_devel("catalog event data has %zu bytes of padding after last event\n",
|
|
event_data_bytes - offset);
|
|
return -1;
|
|
}
|
|
|
|
if (!event_fixed_portion_is_within(event, end)) {
|
|
pr_warn("event %zu fixed portion is not within range\n",
|
|
event_idx);
|
|
return -1;
|
|
}
|
|
|
|
ev_len = be16_to_cpu(event->length);
|
|
|
|
if (ev_len % 16)
|
|
pr_info("event %zu has length %zu not divisible by 16: event=%pK\n",
|
|
event_idx, ev_len, event);
|
|
|
|
ev_end = (__u8 *)event + ev_len;
|
|
if (ev_end > end) {
|
|
pr_warn("event %zu has .length=%zu, ends after buffer end: ev_end=%pK > end=%pK, offset=%zu\n",
|
|
event_idx, ev_len, ev_end, end,
|
|
offset);
|
|
return -1;
|
|
}
|
|
|
|
calc_ev_end = event_end(event, end);
|
|
if (!calc_ev_end) {
|
|
pr_warn("event %zu has a calculated length which exceeds buffer length %zu: event=%pK end=%pK, offset=%zu\n",
|
|
event_idx, event_data_bytes, event, end,
|
|
offset);
|
|
return -1;
|
|
}
|
|
|
|
if (calc_ev_end > ev_end) {
|
|
pr_warn("event %zu exceeds it's own length: event=%pK, end=%pK, offset=%zu, calc_ev_end=%pK\n",
|
|
event_idx, event, ev_end, offset, calc_ev_end);
|
|
return -1;
|
|
}
|
|
|
|
return ev_len;
|
|
}
|
|
|
|
#define MAX_4K (SIZE_MAX / 4096)
|
|
|
|
static int create_events_from_catalog(struct attribute ***events_,
|
|
struct attribute ***event_descs_,
|
|
struct attribute ***event_long_descs_)
|
|
{
|
|
long hret;
|
|
size_t catalog_len, catalog_page_len, event_entry_count,
|
|
event_data_len, event_data_offs,
|
|
event_data_bytes, junk_events, event_idx, event_attr_ct, i,
|
|
attr_max, event_idx_last, desc_ct, long_desc_ct;
|
|
ssize_t ct, ev_len;
|
|
uint64_t catalog_version_num;
|
|
struct attribute **events, **event_descs, **event_long_descs;
|
|
struct hv_24x7_catalog_page_0 *page_0 =
|
|
kmem_cache_alloc(hv_page_cache, GFP_KERNEL);
|
|
void *page = page_0;
|
|
void *event_data, *end;
|
|
struct hv_24x7_event_data *event;
|
|
struct rb_root ev_uniq = RB_ROOT;
|
|
int ret = 0;
|
|
|
|
if (!page) {
|
|
ret = -ENOMEM;
|
|
goto e_out;
|
|
}
|
|
|
|
hret = h_get_24x7_catalog_page(page, 0, 0);
|
|
if (hret) {
|
|
ret = -EIO;
|
|
goto e_free;
|
|
}
|
|
|
|
catalog_version_num = be64_to_cpu(page_0->version);
|
|
catalog_page_len = be32_to_cpu(page_0->length);
|
|
|
|
if (MAX_4K < catalog_page_len) {
|
|
pr_err("invalid page count: %zu\n", catalog_page_len);
|
|
ret = -EIO;
|
|
goto e_free;
|
|
}
|
|
|
|
catalog_len = catalog_page_len * 4096;
|
|
|
|
event_entry_count = be16_to_cpu(page_0->event_entry_count);
|
|
event_data_offs = be16_to_cpu(page_0->event_data_offs);
|
|
event_data_len = be16_to_cpu(page_0->event_data_len);
|
|
|
|
pr_devel("cv %llu cl %zu eec %zu edo %zu edl %zu\n",
|
|
catalog_version_num, catalog_len,
|
|
event_entry_count, event_data_offs, event_data_len);
|
|
|
|
if ((MAX_4K < event_data_len)
|
|
|| (MAX_4K < event_data_offs)
|
|
|| (MAX_4K - event_data_offs < event_data_len)) {
|
|
pr_err("invalid event data offs %zu and/or len %zu\n",
|
|
event_data_offs, event_data_len);
|
|
ret = -EIO;
|
|
goto e_free;
|
|
}
|
|
|
|
if ((event_data_offs + event_data_len) > catalog_page_len) {
|
|
pr_err("event data %zu-%zu does not fit inside catalog 0-%zu\n",
|
|
event_data_offs,
|
|
event_data_offs + event_data_len,
|
|
catalog_page_len);
|
|
ret = -EIO;
|
|
goto e_free;
|
|
}
|
|
|
|
if (SIZE_MAX - 1 < event_entry_count) {
|
|
pr_err("event_entry_count %zu is invalid\n", event_entry_count);
|
|
ret = -EIO;
|
|
goto e_free;
|
|
}
|
|
|
|
event_data_bytes = event_data_len * 4096;
|
|
|
|
/*
|
|
* event data can span several pages, events can cross between these
|
|
* pages. Use vmalloc to make this easier.
|
|
*/
|
|
event_data = vmalloc(event_data_bytes);
|
|
if (!event_data) {
|
|
pr_err("could not allocate event data\n");
|
|
ret = -ENOMEM;
|
|
goto e_free;
|
|
}
|
|
|
|
end = event_data + event_data_bytes;
|
|
|
|
/*
|
|
* using vmalloc_to_phys() like this only works if PAGE_SIZE is
|
|
* divisible by 4096
|
|
*/
|
|
BUILD_BUG_ON(PAGE_SIZE % 4096);
|
|
|
|
for (i = 0; i < event_data_len; i++) {
|
|
hret = h_get_24x7_catalog_page_(
|
|
vmalloc_to_phys(event_data + i * 4096),
|
|
catalog_version_num,
|
|
i + event_data_offs);
|
|
if (hret) {
|
|
pr_err("Failed to get event data in page %zu: rc=%ld\n",
|
|
i + event_data_offs, hret);
|
|
ret = -EIO;
|
|
goto e_event_data;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* scan the catalog to determine the number of attributes we need, and
|
|
* verify it at the same time.
|
|
*/
|
|
for (junk_events = 0, event = event_data, event_idx = 0, attr_max = 0;
|
|
;
|
|
event_idx++, event = (void *)event + ev_len) {
|
|
size_t offset = (void *)event - (void *)event_data;
|
|
char *name;
|
|
int nl;
|
|
|
|
ev_len = catalog_event_len_validate(event, event_idx,
|
|
event_data_bytes,
|
|
event_entry_count,
|
|
offset, end);
|
|
if (ev_len < 0)
|
|
break;
|
|
|
|
name = event_name(event, &nl);
|
|
|
|
if (event->event_group_record_len == 0) {
|
|
pr_devel("invalid event %zu (%.*s): group_record_len == 0, skipping\n",
|
|
event_idx, nl, name);
|
|
junk_events++;
|
|
continue;
|
|
}
|
|
|
|
if (!catalog_entry_domain_is_valid(event->domain)) {
|
|
pr_info("event %zu (%.*s) has invalid domain %d\n",
|
|
event_idx, nl, name, event->domain);
|
|
junk_events++;
|
|
continue;
|
|
}
|
|
|
|
attr_max++;
|
|
}
|
|
|
|
event_idx_last = event_idx;
|
|
if (event_idx_last != event_entry_count)
|
|
pr_warn("event buffer ended before listed # of events were parsed (got %zu, wanted %zu, junk %zu)\n",
|
|
event_idx_last, event_entry_count, junk_events);
|
|
|
|
events = kmalloc_array(attr_max + 1, sizeof(*events), GFP_KERNEL);
|
|
if (!events) {
|
|
ret = -ENOMEM;
|
|
goto e_event_data;
|
|
}
|
|
|
|
event_descs = kmalloc_array(event_idx + 1, sizeof(*event_descs),
|
|
GFP_KERNEL);
|
|
if (!event_descs) {
|
|
ret = -ENOMEM;
|
|
goto e_event_attrs;
|
|
}
|
|
|
|
event_long_descs = kmalloc_array(event_idx + 1,
|
|
sizeof(*event_long_descs), GFP_KERNEL);
|
|
if (!event_long_descs) {
|
|
ret = -ENOMEM;
|
|
goto e_event_descs;
|
|
}
|
|
|
|
/* Iterate over the catalog filling in the attribute vector */
|
|
for (junk_events = 0, event_attr_ct = 0, desc_ct = 0, long_desc_ct = 0,
|
|
event = event_data, event_idx = 0;
|
|
event_idx < event_idx_last;
|
|
event_idx++, ev_len = be16_to_cpu(event->length),
|
|
event = (void *)event + ev_len) {
|
|
char *name;
|
|
int nl;
|
|
int nonce;
|
|
/*
|
|
* these are the only "bad" events that are intermixed and that
|
|
* we can ignore without issue. make sure to skip them here
|
|
*/
|
|
if (event->event_group_record_len == 0)
|
|
continue;
|
|
if (!catalog_entry_domain_is_valid(event->domain))
|
|
continue;
|
|
|
|
name = event_name(event, &nl);
|
|
nonce = event_uniq_add(&ev_uniq, name, nl, event->domain);
|
|
ct = event_data_to_attrs(event_idx, events + event_attr_ct,
|
|
event, nonce);
|
|
if (ct < 0) {
|
|
pr_warn("event %zu (%.*s) creation failure, skipping\n",
|
|
event_idx, nl, name);
|
|
junk_events++;
|
|
} else {
|
|
event_attr_ct++;
|
|
event_descs[desc_ct] = event_to_desc_attr(event, nonce);
|
|
if (event_descs[desc_ct])
|
|
desc_ct++;
|
|
event_long_descs[long_desc_ct] =
|
|
event_to_long_desc_attr(event, nonce);
|
|
if (event_long_descs[long_desc_ct])
|
|
long_desc_ct++;
|
|
}
|
|
}
|
|
|
|
pr_info("read %zu catalog entries, created %zu event attrs (%zu failures), %zu descs\n",
|
|
event_idx, event_attr_ct, junk_events, desc_ct);
|
|
|
|
events[event_attr_ct] = NULL;
|
|
event_descs[desc_ct] = NULL;
|
|
event_long_descs[long_desc_ct] = NULL;
|
|
|
|
event_uniq_destroy(&ev_uniq);
|
|
vfree(event_data);
|
|
kmem_cache_free(hv_page_cache, page);
|
|
|
|
*events_ = events;
|
|
*event_descs_ = event_descs;
|
|
*event_long_descs_ = event_long_descs;
|
|
return 0;
|
|
|
|
e_event_descs:
|
|
kfree(event_descs);
|
|
e_event_attrs:
|
|
kfree(events);
|
|
e_event_data:
|
|
vfree(event_data);
|
|
e_free:
|
|
kmem_cache_free(hv_page_cache, page);
|
|
e_out:
|
|
*events_ = NULL;
|
|
*event_descs_ = NULL;
|
|
*event_long_descs_ = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t catalog_read(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr, char *buf,
|
|
loff_t offset, size_t count)
|
|
{
|
|
long hret;
|
|
ssize_t ret = 0;
|
|
size_t catalog_len = 0, catalog_page_len = 0;
|
|
loff_t page_offset = 0;
|
|
loff_t offset_in_page;
|
|
size_t copy_len;
|
|
uint64_t catalog_version_num = 0;
|
|
void *page = kmem_cache_alloc(hv_page_cache, GFP_USER);
|
|
struct hv_24x7_catalog_page_0 *page_0 = page;
|
|
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
hret = h_get_24x7_catalog_page(page, 0, 0);
|
|
if (hret) {
|
|
ret = -EIO;
|
|
goto e_free;
|
|
}
|
|
|
|
catalog_version_num = be64_to_cpu(page_0->version);
|
|
catalog_page_len = be32_to_cpu(page_0->length);
|
|
catalog_len = catalog_page_len * 4096;
|
|
|
|
page_offset = offset / 4096;
|
|
offset_in_page = offset % 4096;
|
|
|
|
if (page_offset >= catalog_page_len)
|
|
goto e_free;
|
|
|
|
if (page_offset != 0) {
|
|
hret = h_get_24x7_catalog_page(page, catalog_version_num,
|
|
page_offset);
|
|
if (hret) {
|
|
ret = -EIO;
|
|
goto e_free;
|
|
}
|
|
}
|
|
|
|
copy_len = 4096 - offset_in_page;
|
|
if (copy_len > count)
|
|
copy_len = count;
|
|
|
|
memcpy(buf, page+offset_in_page, copy_len);
|
|
ret = copy_len;
|
|
|
|
e_free:
|
|
if (hret)
|
|
pr_err("h_get_24x7_catalog_page(ver=%lld, page=%lld) failed:"
|
|
" rc=%ld\n",
|
|
catalog_version_num, page_offset, hret);
|
|
kmem_cache_free(hv_page_cache, page);
|
|
|
|
pr_devel("catalog_read: offset=%lld(%lld) count=%zu "
|
|
"catalog_len=%zu(%zu) => %zd\n", offset, page_offset,
|
|
count, catalog_len, catalog_page_len, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t domains_show(struct device *dev, struct device_attribute *attr,
|
|
char *page)
|
|
{
|
|
int d, n, count = 0;
|
|
const char *str;
|
|
|
|
for (d = 0; d < HV_PERF_DOMAIN_MAX; d++) {
|
|
str = domain_name(d);
|
|
if (!str)
|
|
continue;
|
|
|
|
n = sprintf(page, "%d: %s\n", d, str);
|
|
if (n < 0)
|
|
break;
|
|
|
|
count += n;
|
|
page += n;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
#define PAGE_0_ATTR(_name, _fmt, _expr) \
|
|
static ssize_t _name##_show(struct device *dev, \
|
|
struct device_attribute *dev_attr, \
|
|
char *buf) \
|
|
{ \
|
|
long hret; \
|
|
ssize_t ret = 0; \
|
|
void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); \
|
|
struct hv_24x7_catalog_page_0 *page_0 = page; \
|
|
if (!page) \
|
|
return -ENOMEM; \
|
|
hret = h_get_24x7_catalog_page(page, 0, 0); \
|
|
if (hret) { \
|
|
ret = -EIO; \
|
|
goto e_free; \
|
|
} \
|
|
ret = sprintf(buf, _fmt, _expr); \
|
|
e_free: \
|
|
kmem_cache_free(hv_page_cache, page); \
|
|
return ret; \
|
|
} \
|
|
static DEVICE_ATTR_RO(_name)
|
|
|
|
PAGE_0_ATTR(catalog_version, "%lld\n",
|
|
(unsigned long long)be64_to_cpu(page_0->version));
|
|
PAGE_0_ATTR(catalog_len, "%lld\n",
|
|
(unsigned long long)be32_to_cpu(page_0->length) * 4096);
|
|
static BIN_ATTR_RO(catalog, 0/* real length varies */);
|
|
static DEVICE_ATTR_RO(domains);
|
|
|
|
static struct bin_attribute *if_bin_attrs[] = {
|
|
&bin_attr_catalog,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute *if_attrs[] = {
|
|
&dev_attr_catalog_len.attr,
|
|
&dev_attr_catalog_version.attr,
|
|
&dev_attr_domains.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group if_group = {
|
|
.name = "interface",
|
|
.bin_attrs = if_bin_attrs,
|
|
.attrs = if_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *attr_groups[] = {
|
|
&format_group,
|
|
&event_group,
|
|
&event_desc_group,
|
|
&event_long_desc_group,
|
|
&if_group,
|
|
NULL,
|
|
};
|
|
|
|
/*
|
|
* Start the process for a new H_GET_24x7_DATA hcall.
|
|
*/
|
|
static void init_24x7_request(struct hv_24x7_request_buffer *request_buffer,
|
|
struct hv_24x7_data_result_buffer *result_buffer)
|
|
{
|
|
|
|
memset(request_buffer, 0, H24x7_DATA_BUFFER_SIZE);
|
|
memset(result_buffer, 0, H24x7_DATA_BUFFER_SIZE);
|
|
|
|
request_buffer->interface_version = interface_version;
|
|
/* memset above set request_buffer->num_requests to 0 */
|
|
}
|
|
|
|
/*
|
|
* Commit (i.e perform) the H_GET_24x7_DATA hcall using the data collected
|
|
* by 'init_24x7_request()' and 'add_event_to_24x7_request()'.
|
|
*/
|
|
static int make_24x7_request(struct hv_24x7_request_buffer *request_buffer,
|
|
struct hv_24x7_data_result_buffer *result_buffer)
|
|
{
|
|
long ret;
|
|
|
|
/*
|
|
* NOTE: Due to variable number of array elements in request and
|
|
* result buffer(s), sizeof() is not reliable. Use the actual
|
|
* allocated buffer size, H24x7_DATA_BUFFER_SIZE.
|
|
*/
|
|
ret = plpar_hcall_norets(H_GET_24X7_DATA,
|
|
virt_to_phys(request_buffer), H24x7_DATA_BUFFER_SIZE,
|
|
virt_to_phys(result_buffer), H24x7_DATA_BUFFER_SIZE);
|
|
|
|
if (ret) {
|
|
struct hv_24x7_request *req;
|
|
|
|
req = request_buffer->requests;
|
|
pr_notice_ratelimited("hcall failed: [%d %#x %#x %d] => ret 0x%lx (%ld) detail=0x%x failing ix=%x\n",
|
|
req->performance_domain, req->data_offset,
|
|
req->starting_ix, req->starting_lpar_ix,
|
|
ret, ret, result_buffer->detailed_rc,
|
|
result_buffer->failing_request_ix);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Add the given @event to the next slot in the 24x7 request_buffer.
|
|
*
|
|
* Note that H_GET_24X7_DATA hcall allows reading several counters'
|
|
* values in a single HCALL. We expect the caller to add events to the
|
|
* request buffer one by one, make the HCALL and process the results.
|
|
*/
|
|
static int add_event_to_24x7_request(struct perf_event *event,
|
|
struct hv_24x7_request_buffer *request_buffer)
|
|
{
|
|
u16 idx;
|
|
int i;
|
|
size_t req_size;
|
|
struct hv_24x7_request *req;
|
|
|
|
if (request_buffer->num_requests >=
|
|
max_num_requests(request_buffer->interface_version)) {
|
|
pr_devel("Too many requests for 24x7 HCALL %d\n",
|
|
request_buffer->num_requests);
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (event_get_domain(event)) {
|
|
case HV_PERF_DOMAIN_PHYS_CHIP:
|
|
idx = event_get_chip(event);
|
|
break;
|
|
case HV_PERF_DOMAIN_PHYS_CORE:
|
|
idx = event_get_core(event);
|
|
break;
|
|
default:
|
|
idx = event_get_vcpu(event);
|
|
}
|
|
|
|
req_size = H24x7_REQUEST_SIZE(request_buffer->interface_version);
|
|
|
|
i = request_buffer->num_requests++;
|
|
req = (void *) request_buffer->requests + i * req_size;
|
|
|
|
req->performance_domain = event_get_domain(event);
|
|
req->data_size = cpu_to_be16(8);
|
|
req->data_offset = cpu_to_be32(event_get_offset(event));
|
|
req->starting_lpar_ix = cpu_to_be16(event_get_lpar(event));
|
|
req->max_num_lpars = cpu_to_be16(1);
|
|
req->starting_ix = cpu_to_be16(idx);
|
|
req->max_ix = cpu_to_be16(1);
|
|
|
|
if (request_buffer->interface_version > 1) {
|
|
if (domain_needs_aggregation(req->performance_domain))
|
|
req->max_num_thread_groups = -1;
|
|
else if (req->performance_domain != HV_PERF_DOMAIN_PHYS_CHIP) {
|
|
req->starting_thread_group_ix = idx % 2;
|
|
req->max_num_thread_groups = 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* get_count_from_result - get event count from all result elements in result
|
|
*
|
|
* If the event corresponding to this result needs aggregation of the result
|
|
* element values, then this function does that.
|
|
*
|
|
* @event: Event associated with @res.
|
|
* @resb: Result buffer containing @res.
|
|
* @res: Result to work on.
|
|
* @countp: Output variable containing the event count.
|
|
* @next: Optional output variable pointing to the next result in @resb.
|
|
*/
|
|
static int get_count_from_result(struct perf_event *event,
|
|
struct hv_24x7_data_result_buffer *resb,
|
|
struct hv_24x7_result *res, u64 *countp,
|
|
struct hv_24x7_result **next)
|
|
{
|
|
u16 num_elements = be16_to_cpu(res->num_elements_returned);
|
|
u16 data_size = be16_to_cpu(res->result_element_data_size);
|
|
unsigned int data_offset;
|
|
void *element_data;
|
|
int i;
|
|
u64 count;
|
|
|
|
/*
|
|
* We can bail out early if the result is empty.
|
|
*/
|
|
if (!num_elements) {
|
|
pr_debug("Result of request %hhu is empty, nothing to do\n",
|
|
res->result_ix);
|
|
|
|
if (next)
|
|
*next = (struct hv_24x7_result *) res->elements;
|
|
|
|
return -ENODATA;
|
|
}
|
|
|
|
/*
|
|
* Since we always specify 1 as the maximum for the smallest resource
|
|
* we're requesting, there should to be only one element per result.
|
|
* Except when an event needs aggregation, in which case there are more.
|
|
*/
|
|
if (num_elements != 1 &&
|
|
!domain_needs_aggregation(event_get_domain(event))) {
|
|
pr_err("Error: result of request %hhu has %hu elements\n",
|
|
res->result_ix, num_elements);
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
if (data_size != sizeof(u64)) {
|
|
pr_debug("Error: result of request %hhu has data of %hu bytes\n",
|
|
res->result_ix, data_size);
|
|
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
if (resb->interface_version == 1)
|
|
data_offset = offsetof(struct hv_24x7_result_element_v1,
|
|
element_data);
|
|
else
|
|
data_offset = offsetof(struct hv_24x7_result_element_v2,
|
|
element_data);
|
|
|
|
/* Go through the result elements in the result. */
|
|
for (i = count = 0, element_data = res->elements + data_offset;
|
|
i < num_elements;
|
|
i++, element_data += data_size + data_offset)
|
|
count += be64_to_cpu(*((u64 *) element_data));
|
|
|
|
*countp = count;
|
|
|
|
/* The next result is after the last result element. */
|
|
if (next)
|
|
*next = element_data - data_offset;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int single_24x7_request(struct perf_event *event, u64 *count)
|
|
{
|
|
int ret;
|
|
struct hv_24x7_request_buffer *request_buffer;
|
|
struct hv_24x7_data_result_buffer *result_buffer;
|
|
|
|
BUILD_BUG_ON(sizeof(*request_buffer) > 4096);
|
|
BUILD_BUG_ON(sizeof(*result_buffer) > 4096);
|
|
|
|
request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
|
|
result_buffer = (void *)get_cpu_var(hv_24x7_resb);
|
|
|
|
init_24x7_request(request_buffer, result_buffer);
|
|
|
|
ret = add_event_to_24x7_request(event, request_buffer);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = make_24x7_request(request_buffer, result_buffer);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* process result from hcall */
|
|
ret = get_count_from_result(event, result_buffer,
|
|
result_buffer->results, count, NULL);
|
|
|
|
out:
|
|
put_cpu_var(hv_24x7_reqb);
|
|
put_cpu_var(hv_24x7_resb);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int h_24x7_event_init(struct perf_event *event)
|
|
{
|
|
struct hv_perf_caps caps;
|
|
unsigned domain;
|
|
unsigned long hret;
|
|
u64 ct;
|
|
|
|
/* Not our event */
|
|
if (event->attr.type != event->pmu->type)
|
|
return -ENOENT;
|
|
|
|
/* Unused areas must be 0 */
|
|
if (event_get_reserved1(event) ||
|
|
event_get_reserved2(event) ||
|
|
event_get_reserved3(event)) {
|
|
pr_devel("reserved set when forbidden 0x%llx(0x%llx) 0x%llx(0x%llx) 0x%llx(0x%llx)\n",
|
|
event->attr.config,
|
|
event_get_reserved1(event),
|
|
event->attr.config1,
|
|
event_get_reserved2(event),
|
|
event->attr.config2,
|
|
event_get_reserved3(event));
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* unsupported modes and filters */
|
|
if (event->attr.exclude_user ||
|
|
event->attr.exclude_kernel ||
|
|
event->attr.exclude_hv ||
|
|
event->attr.exclude_idle ||
|
|
event->attr.exclude_host ||
|
|
event->attr.exclude_guest)
|
|
return -EINVAL;
|
|
|
|
/* no branch sampling */
|
|
if (has_branch_stack(event))
|
|
return -EOPNOTSUPP;
|
|
|
|
/* offset must be 8 byte aligned */
|
|
if (event_get_offset(event) % 8) {
|
|
pr_devel("bad alignment\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
domain = event_get_domain(event);
|
|
if (domain >= HV_PERF_DOMAIN_MAX) {
|
|
pr_devel("invalid domain %d\n", domain);
|
|
return -EINVAL;
|
|
}
|
|
|
|
hret = hv_perf_caps_get(&caps);
|
|
if (hret) {
|
|
pr_devel("could not get capabilities: rc=%ld\n", hret);
|
|
return -EIO;
|
|
}
|
|
|
|
/* Physical domains & other lpars require extra capabilities */
|
|
if (!caps.collect_privileged && (is_physical_domain(domain) ||
|
|
(event_get_lpar(event) != event_get_lpar_max()))) {
|
|
pr_devel("hv permissions disallow: is_physical_domain:%d, lpar=0x%llx\n",
|
|
is_physical_domain(domain),
|
|
event_get_lpar(event));
|
|
return -EACCES;
|
|
}
|
|
|
|
/* Get the initial value of the counter for this event */
|
|
if (single_24x7_request(event, &ct)) {
|
|
pr_devel("test hcall failed\n");
|
|
return -EIO;
|
|
}
|
|
(void)local64_xchg(&event->hw.prev_count, ct);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u64 h_24x7_get_value(struct perf_event *event)
|
|
{
|
|
u64 ct;
|
|
|
|
if (single_24x7_request(event, &ct))
|
|
/* We checked this in event init, shouldn't fail here... */
|
|
return 0;
|
|
|
|
return ct;
|
|
}
|
|
|
|
static void update_event_count(struct perf_event *event, u64 now)
|
|
{
|
|
s64 prev;
|
|
|
|
prev = local64_xchg(&event->hw.prev_count, now);
|
|
local64_add(now - prev, &event->count);
|
|
}
|
|
|
|
static void h_24x7_event_read(struct perf_event *event)
|
|
{
|
|
u64 now;
|
|
struct hv_24x7_request_buffer *request_buffer;
|
|
struct hv_24x7_hw *h24x7hw;
|
|
int txn_flags;
|
|
|
|
txn_flags = __this_cpu_read(hv_24x7_txn_flags);
|
|
|
|
/*
|
|
* If in a READ transaction, add this counter to the list of
|
|
* counters to read during the next HCALL (i.e commit_txn()).
|
|
* If not in a READ transaction, go ahead and make the HCALL
|
|
* to read this counter by itself.
|
|
*/
|
|
|
|
if (txn_flags & PERF_PMU_TXN_READ) {
|
|
int i;
|
|
int ret;
|
|
|
|
if (__this_cpu_read(hv_24x7_txn_err))
|
|
return;
|
|
|
|
request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
|
|
|
|
ret = add_event_to_24x7_request(event, request_buffer);
|
|
if (ret) {
|
|
__this_cpu_write(hv_24x7_txn_err, ret);
|
|
} else {
|
|
/*
|
|
* Associate the event with the HCALL request index,
|
|
* so ->commit_txn() can quickly find/update count.
|
|
*/
|
|
i = request_buffer->num_requests - 1;
|
|
|
|
h24x7hw = &get_cpu_var(hv_24x7_hw);
|
|
h24x7hw->events[i] = event;
|
|
put_cpu_var(h24x7hw);
|
|
/*
|
|
* Clear the event count so we can compute the _change_
|
|
* in the 24x7 raw counter value at the end of the txn.
|
|
*
|
|
* Note that we could alternatively read the 24x7 value
|
|
* now and save its value in event->hw.prev_count. But
|
|
* that would require issuing a hcall, which would then
|
|
* defeat the purpose of using the txn interface.
|
|
*/
|
|
local64_set(&event->count, 0);
|
|
}
|
|
|
|
put_cpu_var(hv_24x7_reqb);
|
|
} else {
|
|
now = h_24x7_get_value(event);
|
|
update_event_count(event, now);
|
|
}
|
|
}
|
|
|
|
static void h_24x7_event_start(struct perf_event *event, int flags)
|
|
{
|
|
if (flags & PERF_EF_RELOAD)
|
|
local64_set(&event->hw.prev_count, h_24x7_get_value(event));
|
|
}
|
|
|
|
static void h_24x7_event_stop(struct perf_event *event, int flags)
|
|
{
|
|
h_24x7_event_read(event);
|
|
}
|
|
|
|
static int h_24x7_event_add(struct perf_event *event, int flags)
|
|
{
|
|
if (flags & PERF_EF_START)
|
|
h_24x7_event_start(event, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 24x7 counters only support READ transactions. They are
|
|
* always counting and dont need/support ADD transactions.
|
|
* Cache the flags, but otherwise ignore transactions that
|
|
* are not PERF_PMU_TXN_READ.
|
|
*/
|
|
static void h_24x7_event_start_txn(struct pmu *pmu, unsigned int flags)
|
|
{
|
|
struct hv_24x7_request_buffer *request_buffer;
|
|
struct hv_24x7_data_result_buffer *result_buffer;
|
|
|
|
/* We should not be called if we are already in a txn */
|
|
WARN_ON_ONCE(__this_cpu_read(hv_24x7_txn_flags));
|
|
|
|
__this_cpu_write(hv_24x7_txn_flags, flags);
|
|
if (flags & ~PERF_PMU_TXN_READ)
|
|
return;
|
|
|
|
request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
|
|
result_buffer = (void *)get_cpu_var(hv_24x7_resb);
|
|
|
|
init_24x7_request(request_buffer, result_buffer);
|
|
|
|
put_cpu_var(hv_24x7_resb);
|
|
put_cpu_var(hv_24x7_reqb);
|
|
}
|
|
|
|
/*
|
|
* Clean up transaction state.
|
|
*
|
|
* NOTE: Ignore state of request and result buffers for now.
|
|
* We will initialize them during the next read/txn.
|
|
*/
|
|
static void reset_txn(void)
|
|
{
|
|
__this_cpu_write(hv_24x7_txn_flags, 0);
|
|
__this_cpu_write(hv_24x7_txn_err, 0);
|
|
}
|
|
|
|
/*
|
|
* 24x7 counters only support READ transactions. They are always counting
|
|
* and dont need/support ADD transactions. Clear ->txn_flags but otherwise
|
|
* ignore transactions that are not of type PERF_PMU_TXN_READ.
|
|
*
|
|
* For READ transactions, submit all pending 24x7 requests (i.e requests
|
|
* that were queued by h_24x7_event_read()), to the hypervisor and update
|
|
* the event counts.
|
|
*/
|
|
static int h_24x7_event_commit_txn(struct pmu *pmu)
|
|
{
|
|
struct hv_24x7_request_buffer *request_buffer;
|
|
struct hv_24x7_data_result_buffer *result_buffer;
|
|
struct hv_24x7_result *res, *next_res;
|
|
u64 count;
|
|
int i, ret, txn_flags;
|
|
struct hv_24x7_hw *h24x7hw;
|
|
|
|
txn_flags = __this_cpu_read(hv_24x7_txn_flags);
|
|
WARN_ON_ONCE(!txn_flags);
|
|
|
|
ret = 0;
|
|
if (txn_flags & ~PERF_PMU_TXN_READ)
|
|
goto out;
|
|
|
|
ret = __this_cpu_read(hv_24x7_txn_err);
|
|
if (ret)
|
|
goto out;
|
|
|
|
request_buffer = (void *)get_cpu_var(hv_24x7_reqb);
|
|
result_buffer = (void *)get_cpu_var(hv_24x7_resb);
|
|
|
|
ret = make_24x7_request(request_buffer, result_buffer);
|
|
if (ret)
|
|
goto put_reqb;
|
|
|
|
h24x7hw = &get_cpu_var(hv_24x7_hw);
|
|
|
|
/* Go through results in the result buffer to update event counts. */
|
|
for (i = 0, res = result_buffer->results;
|
|
i < result_buffer->num_results; i++, res = next_res) {
|
|
struct perf_event *event = h24x7hw->events[res->result_ix];
|
|
|
|
ret = get_count_from_result(event, result_buffer, res, &count,
|
|
&next_res);
|
|
if (ret)
|
|
break;
|
|
|
|
update_event_count(event, count);
|
|
}
|
|
|
|
put_cpu_var(hv_24x7_hw);
|
|
|
|
put_reqb:
|
|
put_cpu_var(hv_24x7_resb);
|
|
put_cpu_var(hv_24x7_reqb);
|
|
out:
|
|
reset_txn();
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 24x7 counters only support READ transactions. They are always counting
|
|
* and dont need/support ADD transactions. However, regardless of type
|
|
* of transaction, all we need to do is cleanup, so we don't have to check
|
|
* the type of transaction.
|
|
*/
|
|
static void h_24x7_event_cancel_txn(struct pmu *pmu)
|
|
{
|
|
WARN_ON_ONCE(!__this_cpu_read(hv_24x7_txn_flags));
|
|
reset_txn();
|
|
}
|
|
|
|
static struct pmu h_24x7_pmu = {
|
|
.task_ctx_nr = perf_invalid_context,
|
|
|
|
.name = "hv_24x7",
|
|
.attr_groups = attr_groups,
|
|
.event_init = h_24x7_event_init,
|
|
.add = h_24x7_event_add,
|
|
.del = h_24x7_event_stop,
|
|
.start = h_24x7_event_start,
|
|
.stop = h_24x7_event_stop,
|
|
.read = h_24x7_event_read,
|
|
.start_txn = h_24x7_event_start_txn,
|
|
.commit_txn = h_24x7_event_commit_txn,
|
|
.cancel_txn = h_24x7_event_cancel_txn,
|
|
};
|
|
|
|
static int hv_24x7_init(void)
|
|
{
|
|
int r;
|
|
unsigned long hret;
|
|
struct hv_perf_caps caps;
|
|
|
|
if (!firmware_has_feature(FW_FEATURE_LPAR)) {
|
|
pr_debug("not a virtualized system, not enabling\n");
|
|
return -ENODEV;
|
|
} else if (!cur_cpu_spec->oprofile_cpu_type)
|
|
return -ENODEV;
|
|
|
|
/* POWER8 only supports v1, while POWER9 only supports v2. */
|
|
if (!strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power8"))
|
|
interface_version = 1;
|
|
else {
|
|
interface_version = 2;
|
|
|
|
/* SMT8 in POWER9 needs to aggregate result elements. */
|
|
if (threads_per_core == 8)
|
|
aggregate_result_elements = true;
|
|
}
|
|
|
|
hret = hv_perf_caps_get(&caps);
|
|
if (hret) {
|
|
pr_debug("could not obtain capabilities, not enabling, rc=%ld\n",
|
|
hret);
|
|
return -ENODEV;
|
|
}
|
|
|
|
hv_page_cache = kmem_cache_create("hv-page-4096", 4096, 4096, 0, NULL);
|
|
if (!hv_page_cache)
|
|
return -ENOMEM;
|
|
|
|
/* sampling not supported */
|
|
h_24x7_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
|
|
|
|
r = create_events_from_catalog(&event_group.attrs,
|
|
&event_desc_group.attrs,
|
|
&event_long_desc_group.attrs);
|
|
|
|
if (r)
|
|
return r;
|
|
|
|
r = perf_pmu_register(&h_24x7_pmu, h_24x7_pmu.name, -1);
|
|
if (r)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(hv_24x7_init);
|