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1775 lines
44 KiB
1775 lines
44 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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* Hypervisor supplied "24x7" performance counter support |
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* |
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* Author: Cody P Schafer <[email protected]> |
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* Copyright 2014 IBM Corporation. |
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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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|
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#include <asm/rtas.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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|
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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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|
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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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|
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static cpumask_t hv_24x7_cpumask; |
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|
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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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|
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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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|
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/* |
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* The Processor Module Information system parameter allows transferring |
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* of certain processor module information from the platform to the OS. |
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* Refer PAPR+ document to get parameter token value as '43'. |
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*/ |
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|
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#define PROCESSOR_MODULE_INFO 43 |
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|
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static u32 phys_sockets; /* Physical sockets */ |
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static u32 phys_chipspersocket; /* Physical chips per socket*/ |
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static u32 phys_coresperchip; /* Physical cores per chip */ |
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|
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/* |
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* read_24x7_sys_info() |
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* Retrieve the number of sockets and chips per socket and cores per |
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* chip details through the get-system-parameter rtas call. |
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*/ |
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void read_24x7_sys_info(void) |
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{ |
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int call_status, len, ntypes; |
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|
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spin_lock(&rtas_data_buf_lock); |
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|
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/* |
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* Making system parameter: chips and sockets and cores per chip |
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* default to 1. |
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*/ |
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phys_sockets = 1; |
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phys_chipspersocket = 1; |
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phys_coresperchip = 1; |
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|
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call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, |
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NULL, |
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PROCESSOR_MODULE_INFO, |
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__pa(rtas_data_buf), |
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RTAS_DATA_BUF_SIZE); |
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|
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if (call_status != 0) { |
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pr_err("Error calling get-system-parameter %d\n", |
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call_status); |
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} else { |
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len = be16_to_cpup((__be16 *)&rtas_data_buf[0]); |
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if (len < 8) |
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goto out; |
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ntypes = be16_to_cpup((__be16 *)&rtas_data_buf[2]); |
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|
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if (!ntypes) |
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goto out; |
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phys_sockets = be16_to_cpup((__be16 *)&rtas_data_buf[4]); |
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phys_chipspersocket = be16_to_cpup((__be16 *)&rtas_data_buf[6]); |
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phys_coresperchip = be16_to_cpup((__be16 *)&rtas_data_buf[8]); |
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} |
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|
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out: |
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spin_unlock(&rtas_data_buf_lock); |
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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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|
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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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|
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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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|
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WARN_ON_ONCE(domain); |
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return NULL; |
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} |
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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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/* |
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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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/* |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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static struct kmem_cache *hv_page_cache; |
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|
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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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|
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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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|
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DEFINE_PER_CPU(struct hv_24x7_hw, hv_24x7_hw); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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' |
|
* 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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|
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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_); |
|
ldl = be16_to_cpu(*ldl_); |
|
if (ldl < 2) { |
|
pr_debug("%s: long desc len too short (ldl=%u)", |
|
__func__, ldl); |
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return NULL; |
|
} |
|
|
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if (start + nl + dl + ldl > end) { |
|
pr_debug("%s: start=%p + nl=%u + dl=%u + ldl=%u > end=%p", |
|
__func__, start, nl, dl, ldl, end); |
|
return NULL; |
|
} |
|
|
|
return start + nl + dl + ldl; |
|
} |
|
|
|
static long h_get_24x7_catalog_page_(unsigned long phys_4096, |
|
unsigned long version, unsigned long index) |
|
{ |
|
pr_devel("h_get_24x7_catalog_page(0x%lx, %lu, %lu)", |
|
phys_4096, version, index); |
|
|
|
WARN_ON(!IS_ALIGNED(phys_4096, 4096)); |
|
|
|
return plpar_hcall_norets(H_GET_24X7_CATALOG_PAGE, |
|
phys_4096, version, index); |
|
} |
|
|
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static long h_get_24x7_catalog_page(char page[], u64 version, u32 index) |
|
{ |
|
return h_get_24x7_catalog_page_(virt_to_phys(page), |
|
version, index); |
|
} |
|
|
|
/* |
|
* Each event we find in the catalog, will have a sysfs entry. Format the |
|
* data for this sysfs entry based on the event's domain. |
|
* |
|
* Events belonging to the Chip domain can only be monitored in that domain. |
|
* i.e the domain for these events is a fixed/knwon value. |
|
* |
|
* Events belonging to the Core domain can be monitored either in the physical |
|
* core or in one of the virtual CPU domains. So the domain value for these |
|
* events must be specified by the user (i.e is a required parameter). Format |
|
* the Core events with 'domain=?' so the perf-tool can error check required |
|
* parameters. |
|
* |
|
* NOTE: For the Core domain events, rather than making domain a required |
|
* parameter we could default it to PHYS_CORE and allowe users to |
|
* override the domain to one of the VCPU domains. |
|
* |
|
* However, this can make the interface a little inconsistent. |
|
* |
|
* If we set domain=2 (PHYS_CHIP) and allow user to override this field |
|
* the user may be tempted to also modify the "offset=x" field in which |
|
* can lead to confusing usage. Consider the HPM_PCYC (offset=0x18) and |
|
* HPM_INST (offset=0x20) events. With: |
|
* |
|
* perf stat -e hv_24x7/HPM_PCYC,offset=0x20/ |
|
* |
|
* we end up monitoring HPM_INST, while the command line has HPM_PCYC. |
|
* |
|
* By not assigning a default value to the domain for the Core events, |
|
* we can have simple guidelines: |
|
* |
|
* - Specifying values for parameters with "=?" is required. |
|
* |
|
* - Specifying (i.e overriding) values for other parameters |
|
* is undefined. |
|
*/ |
|
static char *event_fmt(struct hv_24x7_event_data *event, unsigned domain) |
|
{ |
|
const char *sindex; |
|
const char *lpar; |
|
const char *domain_str; |
|
char buf[8]; |
|
|
|
switch (domain) { |
|
case HV_PERF_DOMAIN_PHYS_CHIP: |
|
snprintf(buf, sizeof(buf), "%d", domain); |
|
domain_str = buf; |
|
lpar = "0x0"; |
|
sindex = "chip"; |
|
break; |
|
case HV_PERF_DOMAIN_PHYS_CORE: |
|
domain_str = "?"; |
|
lpar = "0x0"; |
|
sindex = "core"; |
|
break; |
|
default: |
|
domain_str = "?"; |
|
lpar = "?"; |
|
sindex = "vcpu"; |
|
} |
|
|
|
return kasprintf(GFP_KERNEL, |
|
"domain=%s,offset=0x%x,%s=?,lpar=%s", |
|
domain_str, |
|
be16_to_cpu(event->event_counter_offs) + |
|
be16_to_cpu(event->event_group_record_offs), |
|
sindex, |
|
lpar); |
|
} |
|
|
|
/* Avoid trusting fw to NUL terminate strings */ |
|
static char *memdup_to_str(char *maybe_str, int max_len, gfp_t gfp) |
|
{ |
|
return kasprintf(gfp, "%.*s", max_len, maybe_str); |
|
} |
|
|
|
static ssize_t device_show_string(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct dev_ext_attribute *d; |
|
|
|
d = container_of(attr, struct dev_ext_attribute, attr); |
|
|
|
return sprintf(buf, "%s\n", (char *)d->var); |
|
} |
|
|
|
static ssize_t cpumask_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
return cpumap_print_to_pagebuf(true, buf, &hv_24x7_cpumask); |
|
} |
|
|
|
static ssize_t sockets_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
return sprintf(buf, "%d\n", phys_sockets); |
|
} |
|
|
|
static ssize_t chipspersocket_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
return sprintf(buf, "%d\n", phys_chipspersocket); |
|
} |
|
|
|
static ssize_t coresperchip_show(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
return sprintf(buf, "%d\n", phys_coresperchip); |
|
} |
|
|
|
static struct attribute *device_str_attr_create_(char *name, char *str) |
|
{ |
|
struct dev_ext_attribute *attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
|
|
|
if (!attr) |
|
return NULL; |
|
|
|
sysfs_attr_init(&attr->attr.attr); |
|
|
|
attr->var = str; |
|
attr->attr.attr.name = name; |
|
attr->attr.attr.mode = 0444; |
|
attr->attr.show = device_show_string; |
|
|
|
return &attr->attr.attr; |
|
} |
|
|
|
/* |
|
* Allocate and initialize strings representing event attributes. |
|
* |
|
* NOTE: The strings allocated here are never destroyed and continue to |
|
* exist till shutdown. This is to allow us to create as many events |
|
* from the catalog as possible, even if we encounter errors with some. |
|
* In case of changes to error paths in future, these may need to be |
|
* freed by the caller. |
|
*/ |
|
static struct attribute *device_str_attr_create(char *name, int name_max, |
|
int name_nonce, |
|
char *str, size_t str_max) |
|
{ |
|
char *n; |
|
char *s = memdup_to_str(str, str_max, GFP_KERNEL); |
|
struct attribute *a; |
|
|
|
if (!s) |
|
return NULL; |
|
|
|
if (!name_nonce) |
|
n = kasprintf(GFP_KERNEL, "%.*s", name_max, name); |
|
else |
|
n = kasprintf(GFP_KERNEL, "%.*s__%d", name_max, name, |
|
name_nonce); |
|
if (!n) |
|
goto out_s; |
|
|
|
a = device_str_attr_create_(n, s); |
|
if (!a) |
|
goto out_n; |
|
|
|
return a; |
|
out_n: |
|
kfree(n); |
|
out_s: |
|
kfree(s); |
|
return NULL; |
|
} |
|
|
|
static struct attribute *event_to_attr(unsigned ix, |
|
struct hv_24x7_event_data *event, |
|
unsigned domain, |
|
int nonce) |
|
{ |
|
int event_name_len; |
|
char *ev_name, *a_ev_name, *val; |
|
struct attribute *attr; |
|
|
|
if (!domain_is_valid(domain)) { |
|
pr_warn("catalog event %u has invalid domain %u\n", |
|
ix, domain); |
|
return NULL; |
|
} |
|
|
|
val = event_fmt(event, domain); |
|
if (!val) |
|
return NULL; |
|
|
|
ev_name = event_name(event, &event_name_len); |
|
if (!nonce) |
|
a_ev_name = kasprintf(GFP_KERNEL, "%.*s", |
|
(int)event_name_len, ev_name); |
|
else |
|
a_ev_name = kasprintf(GFP_KERNEL, "%.*s__%d", |
|
(int)event_name_len, ev_name, nonce); |
|
|
|
if (!a_ev_name) |
|
goto out_val; |
|
|
|
attr = device_str_attr_create_(a_ev_name, val); |
|
if (!attr) |
|
goto out_name; |
|
|
|
return attr; |
|
out_name: |
|
kfree(a_ev_name); |
|
out_val: |
|
kfree(val); |
|
return NULL; |
|
} |
|
|
|
static struct attribute *event_to_desc_attr(struct hv_24x7_event_data *event, |
|
int nonce) |
|
{ |
|
int nl, dl; |
|
char *name = event_name(event, &nl); |
|
char *desc = event_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 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 = rb_entry(*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; |
|
} |
|
|
|
/* |
|
* Return true incase of invalid or dummy events with names like RESERVED* |
|
*/ |
|
static bool ignore_event(const char *name) |
|
{ |
|
return strncmp(name, "RESERVED", 8) == 0; |
|
} |
|
|
|
#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 (ignore_event(name)) { |
|
junk_events++; |
|
continue; |
|
} |
|
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); |
|
if (ignore_event(name)) |
|
continue; |
|
|
|
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 DEVICE_ATTR_RO(sockets); |
|
static DEVICE_ATTR_RO(chipspersocket); |
|
static DEVICE_ATTR_RO(coresperchip); |
|
static DEVICE_ATTR_RO(cpumask); |
|
|
|
static struct bin_attribute *if_bin_attrs[] = { |
|
&bin_attr_catalog, |
|
NULL, |
|
}; |
|
|
|
static struct attribute *cpumask_attrs[] = { |
|
&dev_attr_cpumask.attr, |
|
NULL, |
|
}; |
|
|
|
static struct attribute_group cpumask_attr_group = { |
|
.attrs = cpumask_attrs, |
|
}; |
|
|
|
static struct attribute *if_attrs[] = { |
|
&dev_attr_catalog_len.attr, |
|
&dev_attr_catalog_version.attr, |
|
&dev_attr_domains.attr, |
|
&dev_attr_sockets.attr, |
|
&dev_attr_chipspersocket.attr, |
|
&dev_attr_coresperchip.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, |
|
&cpumask_attr_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; |
|
} |
|
|
|
/* 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); |
|
} |
|
|
|
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, |
|
.capabilities = PERF_PMU_CAP_NO_EXCLUDE, |
|
}; |
|
|
|
static int ppc_hv_24x7_cpu_online(unsigned int cpu) |
|
{ |
|
if (cpumask_empty(&hv_24x7_cpumask)) |
|
cpumask_set_cpu(cpu, &hv_24x7_cpumask); |
|
|
|
return 0; |
|
} |
|
|
|
static int ppc_hv_24x7_cpu_offline(unsigned int cpu) |
|
{ |
|
int target; |
|
|
|
/* Check if exiting cpu is used for collecting 24x7 events */ |
|
if (!cpumask_test_and_clear_cpu(cpu, &hv_24x7_cpumask)) |
|
return 0; |
|
|
|
/* Find a new cpu to collect 24x7 events */ |
|
target = cpumask_last(cpu_active_mask); |
|
|
|
if (target < 0 || target >= nr_cpu_ids) { |
|
pr_err("hv_24x7: CPU hotplug init failed\n"); |
|
return -1; |
|
} |
|
|
|
/* Migrate 24x7 events to the new target */ |
|
cpumask_set_cpu(target, &hv_24x7_cpumask); |
|
perf_pmu_migrate_context(&h_24x7_pmu, cpu, target); |
|
|
|
return 0; |
|
} |
|
|
|
static int hv_24x7_cpu_hotplug_init(void) |
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{ |
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return cpuhp_setup_state(CPUHP_AP_PERF_POWERPC_HV_24x7_ONLINE, |
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"perf/powerpc/hv_24x7:online", |
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ppc_hv_24x7_cpu_online, |
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ppc_hv_24x7_cpu_offline); |
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} |
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|
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static int hv_24x7_init(void) |
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{ |
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int r; |
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unsigned long hret; |
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struct hv_perf_caps caps; |
|
|
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if (!firmware_has_feature(FW_FEATURE_LPAR)) { |
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pr_debug("not a virtualized system, not enabling\n"); |
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return -ENODEV; |
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} else if (!cur_cpu_spec->oprofile_cpu_type) |
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return -ENODEV; |
|
|
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/* POWER8 only supports v1, while POWER9 only supports v2. */ |
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if (!strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power8")) |
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interface_version = 1; |
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else { |
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interface_version = 2; |
|
|
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/* SMT8 in POWER9 needs to aggregate result elements. */ |
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if (threads_per_core == 8) |
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aggregate_result_elements = true; |
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} |
|
|
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hret = hv_perf_caps_get(&caps); |
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if (hret) { |
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pr_debug("could not obtain capabilities, not enabling, rc=%ld\n", |
|
hret); |
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return -ENODEV; |
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} |
|
|
|
hv_page_cache = kmem_cache_create("hv-page-4096", 4096, 4096, 0, NULL); |
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if (!hv_page_cache) |
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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) |
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return r; |
|
|
|
/* init cpuhotplug */ |
|
r = hv_24x7_cpu_hotplug_init(); |
|
if (r) |
|
return r; |
|
|
|
r = perf_pmu_register(&h_24x7_pmu, h_24x7_pmu.name, -1); |
|
if (r) |
|
return r; |
|
|
|
read_24x7_sys_info(); |
|
|
|
return 0; |
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} |
|
|
|
device_initcall(hv_24x7_init);
|
|
|