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1194 lines
34 KiB
1194 lines
34 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Performance event support for s390x - CPU-measurement Counter Sets |
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* |
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* Copyright IBM Corp. 2019, 2021 |
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* Author(s): Hendrik Brueckner <[email protected]> |
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* Thomas Richer <[email protected]> |
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*/ |
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#define KMSG_COMPONENT "cpum_cf_diag" |
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
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|
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#include <linux/kernel.h> |
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#include <linux/kernel_stat.h> |
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#include <linux/percpu.h> |
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#include <linux/notifier.h> |
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#include <linux/init.h> |
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#include <linux/export.h> |
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#include <linux/slab.h> |
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#include <linux/processor.h> |
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#include <linux/miscdevice.h> |
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#include <linux/mutex.h> |
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|
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#include <asm/ctl_reg.h> |
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#include <asm/irq.h> |
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#include <asm/cpu_mcf.h> |
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#include <asm/timex.h> |
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#include <asm/debug.h> |
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|
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#include <asm/hwctrset.h> |
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|
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#define CF_DIAG_CTRSET_DEF 0xfeef /* Counter set header mark */ |
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/* interval in seconds */ |
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static unsigned int cf_diag_cpu_speed; |
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static debug_info_t *cf_diag_dbg; |
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|
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struct cf_diag_csd { /* Counter set data per CPU */ |
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size_t used; /* Bytes used in data/start */ |
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unsigned char start[PAGE_SIZE]; /* Counter set at event start */ |
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unsigned char data[PAGE_SIZE]; /* Counter set at event delete */ |
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unsigned int sets; /* # Counter set saved in data */ |
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}; |
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static DEFINE_PER_CPU(struct cf_diag_csd, cf_diag_csd); |
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|
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/* Counter sets are stored as data stream in a page sized memory buffer and |
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* exported to user space via raw data attached to the event sample data. |
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* Each counter set starts with an eight byte header consisting of: |
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* - a two byte eye catcher (0xfeef) |
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* - a one byte counter set number |
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* - a two byte counter set size (indicates the number of counters in this set) |
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* - a three byte reserved value (must be zero) to make the header the same |
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* size as a counter value. |
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* All counter values are eight byte in size. |
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* |
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* All counter sets are followed by a 64 byte trailer. |
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* The trailer consists of a: |
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* - flag field indicating valid fields when corresponding bit set |
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* - the counter facility first and second version number |
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* - the CPU speed if nonzero |
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* - the time stamp the counter sets have been collected |
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* - the time of day (TOD) base value |
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* - the machine type. |
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* |
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* The counter sets are saved when the process is prepared to be executed on a |
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* CPU and saved again when the process is going to be removed from a CPU. |
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* The difference of both counter sets are calculated and stored in the event |
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* sample data area. |
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*/ |
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|
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struct cf_ctrset_entry { /* CPU-M CF counter set entry (8 byte) */ |
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unsigned int def:16; /* 0-15 Data Entry Format */ |
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unsigned int set:16; /* 16-31 Counter set identifier */ |
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unsigned int ctr:16; /* 32-47 Number of stored counters */ |
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unsigned int res1:16; /* 48-63 Reserved */ |
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}; |
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|
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struct cf_trailer_entry { /* CPU-M CF_DIAG trailer (64 byte) */ |
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/* 0 - 7 */ |
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union { |
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struct { |
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unsigned int clock_base:1; /* TOD clock base set */ |
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unsigned int speed:1; /* CPU speed set */ |
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/* Measurement alerts */ |
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unsigned int mtda:1; /* Loss of MT ctr. data alert */ |
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unsigned int caca:1; /* Counter auth. change alert */ |
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unsigned int lcda:1; /* Loss of counter data alert */ |
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}; |
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unsigned long flags; /* 0-63 All indicators */ |
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}; |
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/* 8 - 15 */ |
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unsigned int cfvn:16; /* 64-79 Ctr First Version */ |
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unsigned int csvn:16; /* 80-95 Ctr Second Version */ |
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unsigned int cpu_speed:32; /* 96-127 CPU speed */ |
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/* 16 - 23 */ |
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unsigned long timestamp; /* 128-191 Timestamp (TOD) */ |
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/* 24 - 55 */ |
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union { |
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struct { |
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unsigned long progusage1; |
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unsigned long progusage2; |
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unsigned long progusage3; |
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unsigned long tod_base; |
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}; |
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unsigned long progusage[4]; |
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}; |
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/* 56 - 63 */ |
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unsigned int mach_type:16; /* Machine type */ |
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unsigned int res1:16; /* Reserved */ |
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unsigned int res2:32; /* Reserved */ |
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}; |
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|
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/* Create the trailer data at the end of a page. */ |
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static void cf_diag_trailer(struct cf_trailer_entry *te) |
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{ |
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struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); |
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struct cpuid cpuid; |
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|
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te->cfvn = cpuhw->info.cfvn; /* Counter version numbers */ |
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te->csvn = cpuhw->info.csvn; |
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|
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get_cpu_id(&cpuid); /* Machine type */ |
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te->mach_type = cpuid.machine; |
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te->cpu_speed = cf_diag_cpu_speed; |
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if (te->cpu_speed) |
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te->speed = 1; |
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te->clock_base = 1; /* Save clock base */ |
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te->tod_base = tod_clock_base.tod; |
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te->timestamp = get_tod_clock_fast(); |
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} |
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|
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/* |
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* Change the CPUMF state to active. |
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* Enable and activate the CPU-counter sets according |
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* to the per-cpu control state. |
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*/ |
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static void cf_diag_enable(struct pmu *pmu) |
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{ |
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struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); |
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int err; |
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|
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debug_sprintf_event(cf_diag_dbg, 5, |
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"%s pmu %p cpu %d flags %#x state %#llx\n", |
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__func__, pmu, smp_processor_id(), cpuhw->flags, |
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cpuhw->state); |
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if (cpuhw->flags & PMU_F_ENABLED) |
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return; |
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|
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err = lcctl(cpuhw->state); |
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if (err) { |
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pr_err("Enabling the performance measuring unit " |
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"failed with rc=%x\n", err); |
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return; |
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} |
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cpuhw->flags |= PMU_F_ENABLED; |
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} |
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|
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/* |
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* Change the CPUMF state to inactive. |
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* Disable and enable (inactive) the CPU-counter sets according |
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* to the per-cpu control state. |
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*/ |
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static void cf_diag_disable(struct pmu *pmu) |
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{ |
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struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); |
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u64 inactive; |
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int err; |
|
|
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debug_sprintf_event(cf_diag_dbg, 5, |
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"%s pmu %p cpu %d flags %#x state %#llx\n", |
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__func__, pmu, smp_processor_id(), cpuhw->flags, |
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cpuhw->state); |
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if (!(cpuhw->flags & PMU_F_ENABLED)) |
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return; |
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|
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inactive = cpuhw->state & ~((1 << CPUMF_LCCTL_ENABLE_SHIFT) - 1); |
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err = lcctl(inactive); |
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if (err) { |
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pr_err("Disabling the performance measuring unit " |
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"failed with rc=%x\n", err); |
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return; |
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} |
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cpuhw->flags &= ~PMU_F_ENABLED; |
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} |
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|
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/* Number of perf events counting hardware events */ |
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static atomic_t cf_diag_events = ATOMIC_INIT(0); |
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/* Used to avoid races in calling reserve/release_cpumf_hardware */ |
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static DEFINE_MUTEX(cf_diag_reserve_mutex); |
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|
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/* Release the PMU if event is the last perf event */ |
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static void cf_diag_perf_event_destroy(struct perf_event *event) |
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{ |
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debug_sprintf_event(cf_diag_dbg, 5, |
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"%s event %p cpu %d cf_diag_events %d\n", |
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__func__, event, smp_processor_id(), |
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atomic_read(&cf_diag_events)); |
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if (atomic_dec_return(&cf_diag_events) == 0) |
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__kernel_cpumcf_end(); |
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} |
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|
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static int get_authctrsets(void) |
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{ |
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struct cpu_cf_events *cpuhw; |
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unsigned long auth = 0; |
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enum cpumf_ctr_set i; |
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|
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cpuhw = &get_cpu_var(cpu_cf_events); |
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for (i = CPUMF_CTR_SET_BASIC; i < CPUMF_CTR_SET_MAX; ++i) { |
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if (cpuhw->info.auth_ctl & cpumf_ctr_ctl[i]) |
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auth |= cpumf_ctr_ctl[i]; |
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} |
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put_cpu_var(cpu_cf_events); |
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return auth; |
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} |
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|
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/* Setup the event. Test for authorized counter sets and only include counter |
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* sets which are authorized at the time of the setup. Including unauthorized |
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* counter sets result in specification exception (and panic). |
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*/ |
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static int __hw_perf_event_init(struct perf_event *event) |
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{ |
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struct perf_event_attr *attr = &event->attr; |
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int err = 0; |
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|
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debug_sprintf_event(cf_diag_dbg, 5, "%s event %p cpu %d\n", __func__, |
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event, event->cpu); |
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|
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event->hw.config = attr->config; |
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|
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/* Add all authorized counter sets to config_base. The |
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* the hardware init function is either called per-cpu or just once |
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* for all CPUS (event->cpu == -1). This depends on the whether |
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* counting is started for all CPUs or on a per workload base where |
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* the perf event moves from one CPU to another CPU. |
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* Checking the authorization on any CPU is fine as the hardware |
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* applies the same authorization settings to all CPUs. |
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*/ |
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event->hw.config_base = get_authctrsets(); |
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|
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/* No authorized counter sets, nothing to count/sample */ |
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if (!event->hw.config_base) { |
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err = -EINVAL; |
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goto out; |
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} |
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|
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/* Set sample_period to indicate sampling */ |
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event->hw.sample_period = attr->sample_period; |
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local64_set(&event->hw.period_left, event->hw.sample_period); |
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event->hw.last_period = event->hw.sample_period; |
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out: |
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debug_sprintf_event(cf_diag_dbg, 5, "%s err %d config_base %#lx\n", |
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__func__, err, event->hw.config_base); |
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return err; |
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} |
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|
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/* Return 0 if the CPU-measurement counter facility is currently free |
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* and an error otherwise. |
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*/ |
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static int cf_diag_perf_event_inuse(void) |
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{ |
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int err = 0; |
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|
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if (!atomic_inc_not_zero(&cf_diag_events)) { |
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mutex_lock(&cf_diag_reserve_mutex); |
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if (atomic_read(&cf_diag_events) == 0 && |
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__kernel_cpumcf_begin()) |
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err = -EBUSY; |
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else |
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err = atomic_inc_return(&cf_diag_events); |
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mutex_unlock(&cf_diag_reserve_mutex); |
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} |
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return err; |
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} |
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|
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static int cf_diag_event_init(struct perf_event *event) |
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{ |
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struct perf_event_attr *attr = &event->attr; |
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int err = -ENOENT; |
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|
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debug_sprintf_event(cf_diag_dbg, 5, |
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"%s event %p cpu %d config %#llx type:%u " |
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"sample_type %#llx cf_diag_events %d\n", __func__, |
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event, event->cpu, attr->config, event->pmu->type, |
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attr->sample_type, atomic_read(&cf_diag_events)); |
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|
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if (event->attr.config != PERF_EVENT_CPUM_CF_DIAG || |
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event->attr.type != event->pmu->type) |
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goto out; |
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|
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/* Raw events are used to access counters directly, |
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* hence do not permit excludes. |
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* This event is usesless without PERF_SAMPLE_RAW to return counter set |
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* values as raw data. |
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*/ |
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if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv || |
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!(attr->sample_type & (PERF_SAMPLE_CPU | PERF_SAMPLE_RAW))) { |
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err = -EOPNOTSUPP; |
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goto out; |
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} |
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|
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/* Initialize for using the CPU-measurement counter facility */ |
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err = cf_diag_perf_event_inuse(); |
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if (err < 0) |
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goto out; |
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event->destroy = cf_diag_perf_event_destroy; |
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|
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err = __hw_perf_event_init(event); |
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if (unlikely(err)) |
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event->destroy(event); |
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out: |
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debug_sprintf_event(cf_diag_dbg, 5, "%s err %d\n", __func__, err); |
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return err; |
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} |
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|
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static void cf_diag_read(struct perf_event *event) |
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{ |
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debug_sprintf_event(cf_diag_dbg, 5, "%s event %p\n", __func__, event); |
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} |
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|
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/* Return the maximum possible counter set size (in number of 8 byte counters) |
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* depending on type and model number. |
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*/ |
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static size_t cf_diag_ctrset_size(enum cpumf_ctr_set ctrset, |
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struct cpumf_ctr_info *info) |
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{ |
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size_t ctrset_size = 0; |
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|
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switch (ctrset) { |
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case CPUMF_CTR_SET_BASIC: |
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if (info->cfvn >= 1) |
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ctrset_size = 6; |
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break; |
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case CPUMF_CTR_SET_USER: |
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if (info->cfvn == 1) |
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ctrset_size = 6; |
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else if (info->cfvn >= 3) |
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ctrset_size = 2; |
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break; |
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case CPUMF_CTR_SET_CRYPTO: |
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if (info->csvn >= 1 && info->csvn <= 5) |
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ctrset_size = 16; |
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else if (info->csvn == 6) |
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ctrset_size = 20; |
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break; |
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case CPUMF_CTR_SET_EXT: |
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if (info->csvn == 1) |
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ctrset_size = 32; |
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else if (info->csvn == 2) |
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ctrset_size = 48; |
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else if (info->csvn >= 3 && info->csvn <= 5) |
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ctrset_size = 128; |
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else if (info->csvn == 6) |
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ctrset_size = 160; |
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break; |
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case CPUMF_CTR_SET_MT_DIAG: |
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if (info->csvn > 3) |
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ctrset_size = 48; |
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break; |
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case CPUMF_CTR_SET_MAX: |
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break; |
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} |
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|
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return ctrset_size; |
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} |
|
|
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/* Calculate memory needed to store all counter sets together with header and |
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* trailer data. This is independend of the counter set authorization which |
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* can vary depending on the configuration. |
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*/ |
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static size_t cf_diag_ctrset_maxsize(struct cpumf_ctr_info *info) |
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{ |
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size_t max_size = sizeof(struct cf_trailer_entry); |
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enum cpumf_ctr_set i; |
|
|
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for (i = CPUMF_CTR_SET_BASIC; i < CPUMF_CTR_SET_MAX; ++i) { |
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size_t size = cf_diag_ctrset_size(i, info); |
|
|
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if (size) |
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max_size += size * sizeof(u64) + |
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sizeof(struct cf_ctrset_entry); |
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} |
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debug_sprintf_event(cf_diag_dbg, 5, "%s max_size %zu\n", __func__, |
|
max_size); |
|
|
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return max_size; |
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} |
|
|
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/* Read a counter set. The counter set number determines which counter set and |
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* the CPUM-CF first and second version number determine the number of |
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* available counters in this counter set. |
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* Each counter set starts with header containing the counter set number and |
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* the number of 8 byte counters. |
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* |
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* The functions returns the number of bytes occupied by this counter set |
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* including the header. |
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* If there is no counter in the counter set, this counter set is useless and |
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* zero is returned on this case. |
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*/ |
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static size_t cf_diag_getctrset(struct cf_ctrset_entry *ctrdata, int ctrset, |
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size_t room) |
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{ |
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struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); |
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size_t ctrset_size, need = 0; |
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int rc = 3; /* Assume write failure */ |
|
|
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ctrdata->def = CF_DIAG_CTRSET_DEF; |
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ctrdata->set = ctrset; |
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ctrdata->res1 = 0; |
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ctrset_size = cf_diag_ctrset_size(ctrset, &cpuhw->info); |
|
|
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if (ctrset_size) { /* Save data */ |
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need = ctrset_size * sizeof(u64) + sizeof(*ctrdata); |
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if (need <= room) |
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rc = ctr_stcctm(ctrset, ctrset_size, |
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(u64 *)(ctrdata + 1)); |
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if (rc != 3) |
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ctrdata->ctr = ctrset_size; |
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else |
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need = 0; |
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} |
|
|
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debug_sprintf_event(cf_diag_dbg, 6, |
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"%s ctrset %d ctrset_size %zu cfvn %d csvn %d" |
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" need %zd rc %d\n", |
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__func__, ctrset, ctrset_size, cpuhw->info.cfvn, |
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cpuhw->info.csvn, need, rc); |
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return need; |
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} |
|
|
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/* Read out all counter sets and save them in the provided data buffer. |
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* The last 64 byte host an artificial trailer entry. |
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*/ |
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static size_t cf_diag_getctr(void *data, size_t sz, unsigned long auth) |
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{ |
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struct cf_trailer_entry *trailer; |
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size_t offset = 0, done; |
|
int i; |
|
|
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memset(data, 0, sz); |
|
sz -= sizeof(*trailer); /* Always room for trailer */ |
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for (i = CPUMF_CTR_SET_BASIC; i < CPUMF_CTR_SET_MAX; ++i) { |
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struct cf_ctrset_entry *ctrdata = data + offset; |
|
|
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if (!(auth & cpumf_ctr_ctl[i])) |
|
continue; /* Counter set not authorized */ |
|
|
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done = cf_diag_getctrset(ctrdata, i, sz - offset); |
|
offset += done; |
|
debug_sprintf_event(cf_diag_dbg, 6, |
|
"%s ctrset %d offset %zu done %zu\n", |
|
__func__, i, offset, done); |
|
} |
|
trailer = data + offset; |
|
cf_diag_trailer(trailer); |
|
return offset + sizeof(*trailer); |
|
} |
|
|
|
/* Calculate the difference for each counter in a counter set. */ |
|
static void cf_diag_diffctrset(u64 *pstart, u64 *pstop, int counters) |
|
{ |
|
for (; --counters >= 0; ++pstart, ++pstop) |
|
if (*pstop >= *pstart) |
|
*pstop -= *pstart; |
|
else |
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*pstop = *pstart - *pstop; |
|
} |
|
|
|
/* Scan the counter sets and calculate the difference of each counter |
|
* in each set. The result is the increment of each counter during the |
|
* period the counter set has been activated. |
|
* |
|
* Return true on success. |
|
*/ |
|
static int cf_diag_diffctr(struct cf_diag_csd *csd, unsigned long auth) |
|
{ |
|
struct cf_trailer_entry *trailer_start, *trailer_stop; |
|
struct cf_ctrset_entry *ctrstart, *ctrstop; |
|
size_t offset = 0; |
|
|
|
auth &= (1 << CPUMF_LCCTL_ENABLE_SHIFT) - 1; |
|
do { |
|
ctrstart = (struct cf_ctrset_entry *)(csd->start + offset); |
|
ctrstop = (struct cf_ctrset_entry *)(csd->data + offset); |
|
|
|
if (memcmp(ctrstop, ctrstart, sizeof(*ctrstop))) { |
|
pr_err("cpum_cf_diag counter set compare error " |
|
"in set %i\n", ctrstart->set); |
|
return 0; |
|
} |
|
auth &= ~cpumf_ctr_ctl[ctrstart->set]; |
|
if (ctrstart->def == CF_DIAG_CTRSET_DEF) { |
|
cf_diag_diffctrset((u64 *)(ctrstart + 1), |
|
(u64 *)(ctrstop + 1), ctrstart->ctr); |
|
offset += ctrstart->ctr * sizeof(u64) + |
|
sizeof(*ctrstart); |
|
} |
|
debug_sprintf_event(cf_diag_dbg, 6, |
|
"%s set %d ctr %d offset %zu auth %lx\n", |
|
__func__, ctrstart->set, ctrstart->ctr, |
|
offset, auth); |
|
} while (ctrstart->def && auth); |
|
|
|
/* Save time_stamp from start of event in stop's trailer */ |
|
trailer_start = (struct cf_trailer_entry *)(csd->start + offset); |
|
trailer_stop = (struct cf_trailer_entry *)(csd->data + offset); |
|
trailer_stop->progusage[0] = trailer_start->timestamp; |
|
|
|
return 1; |
|
} |
|
|
|
/* Create perf event sample with the counter sets as raw data. The sample |
|
* is then pushed to the event subsystem and the function checks for |
|
* possible event overflows. If an event overflow occurs, the PMU is |
|
* stopped. |
|
* |
|
* Return non-zero if an event overflow occurred. |
|
*/ |
|
static int cf_diag_push_sample(struct perf_event *event, |
|
struct cf_diag_csd *csd) |
|
{ |
|
struct perf_sample_data data; |
|
struct perf_raw_record raw; |
|
struct pt_regs regs; |
|
int overflow; |
|
|
|
/* Setup perf sample */ |
|
perf_sample_data_init(&data, 0, event->hw.last_period); |
|
memset(®s, 0, sizeof(regs)); |
|
memset(&raw, 0, sizeof(raw)); |
|
|
|
if (event->attr.sample_type & PERF_SAMPLE_CPU) |
|
data.cpu_entry.cpu = event->cpu; |
|
if (event->attr.sample_type & PERF_SAMPLE_RAW) { |
|
raw.frag.size = csd->used; |
|
raw.frag.data = csd->data; |
|
raw.size = csd->used; |
|
data.raw = &raw; |
|
} |
|
|
|
overflow = perf_event_overflow(event, &data, ®s); |
|
debug_sprintf_event(cf_diag_dbg, 6, |
|
"%s event %p cpu %d sample_type %#llx raw %d " |
|
"ov %d\n", __func__, event, event->cpu, |
|
event->attr.sample_type, raw.size, overflow); |
|
if (overflow) |
|
event->pmu->stop(event, 0); |
|
|
|
perf_event_update_userpage(event); |
|
return overflow; |
|
} |
|
|
|
static void cf_diag_start(struct perf_event *event, int flags) |
|
{ |
|
struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); |
|
struct cf_diag_csd *csd = this_cpu_ptr(&cf_diag_csd); |
|
struct hw_perf_event *hwc = &event->hw; |
|
|
|
debug_sprintf_event(cf_diag_dbg, 5, |
|
"%s event %p cpu %d flags %#x hwc-state %#x\n", |
|
__func__, event, event->cpu, flags, hwc->state); |
|
if (WARN_ON_ONCE(!(hwc->state & PERF_HES_STOPPED))) |
|
return; |
|
|
|
/* (Re-)enable and activate all counter sets */ |
|
lcctl(0); /* Reset counter sets */ |
|
hwc->state = 0; |
|
ctr_set_multiple_enable(&cpuhw->state, hwc->config_base); |
|
lcctl(cpuhw->state); /* Enable counter sets */ |
|
csd->used = cf_diag_getctr(csd->start, sizeof(csd->start), |
|
event->hw.config_base); |
|
ctr_set_multiple_start(&cpuhw->state, hwc->config_base); |
|
/* Function cf_diag_enable() starts the counter sets. */ |
|
} |
|
|
|
static void cf_diag_stop(struct perf_event *event, int flags) |
|
{ |
|
struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); |
|
struct cf_diag_csd *csd = this_cpu_ptr(&cf_diag_csd); |
|
struct hw_perf_event *hwc = &event->hw; |
|
|
|
debug_sprintf_event(cf_diag_dbg, 5, |
|
"%s event %p cpu %d flags %#x hwc-state %#x\n", |
|
__func__, event, event->cpu, flags, hwc->state); |
|
|
|
/* Deactivate all counter sets */ |
|
ctr_set_multiple_stop(&cpuhw->state, hwc->config_base); |
|
local64_inc(&event->count); |
|
csd->used = cf_diag_getctr(csd->data, sizeof(csd->data), |
|
event->hw.config_base); |
|
if (cf_diag_diffctr(csd, event->hw.config_base)) |
|
cf_diag_push_sample(event, csd); |
|
hwc->state |= PERF_HES_STOPPED; |
|
} |
|
|
|
static int cf_diag_add(struct perf_event *event, int flags) |
|
{ |
|
struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); |
|
int err = 0; |
|
|
|
debug_sprintf_event(cf_diag_dbg, 5, |
|
"%s event %p cpu %d flags %#x cpuhw %p\n", |
|
__func__, event, event->cpu, flags, cpuhw); |
|
|
|
if (cpuhw->flags & PMU_F_IN_USE) { |
|
err = -EAGAIN; |
|
goto out; |
|
} |
|
|
|
event->hw.state = PERF_HES_UPTODATE | PERF_HES_STOPPED; |
|
|
|
cpuhw->flags |= PMU_F_IN_USE; |
|
if (flags & PERF_EF_START) |
|
cf_diag_start(event, PERF_EF_RELOAD); |
|
out: |
|
debug_sprintf_event(cf_diag_dbg, 5, "%s err %d\n", __func__, err); |
|
return err; |
|
} |
|
|
|
static void cf_diag_del(struct perf_event *event, int flags) |
|
{ |
|
struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); |
|
|
|
debug_sprintf_event(cf_diag_dbg, 5, |
|
"%s event %p cpu %d flags %#x\n", |
|
__func__, event, event->cpu, flags); |
|
|
|
cf_diag_stop(event, PERF_EF_UPDATE); |
|
ctr_set_multiple_stop(&cpuhw->state, event->hw.config_base); |
|
ctr_set_multiple_disable(&cpuhw->state, event->hw.config_base); |
|
cpuhw->flags &= ~PMU_F_IN_USE; |
|
} |
|
|
|
/* Default counter set events and format attribute groups */ |
|
|
|
CPUMF_EVENT_ATTR(CF_DIAG, CF_DIAG, PERF_EVENT_CPUM_CF_DIAG); |
|
|
|
static struct attribute *cf_diag_events_attr[] = { |
|
CPUMF_EVENT_PTR(CF_DIAG, CF_DIAG), |
|
NULL, |
|
}; |
|
|
|
PMU_FORMAT_ATTR(event, "config:0-63"); |
|
|
|
static struct attribute *cf_diag_format_attr[] = { |
|
&format_attr_event.attr, |
|
NULL, |
|
}; |
|
|
|
static struct attribute_group cf_diag_events_group = { |
|
.name = "events", |
|
.attrs = cf_diag_events_attr, |
|
}; |
|
static struct attribute_group cf_diag_format_group = { |
|
.name = "format", |
|
.attrs = cf_diag_format_attr, |
|
}; |
|
static const struct attribute_group *cf_diag_attr_groups[] = { |
|
&cf_diag_events_group, |
|
&cf_diag_format_group, |
|
NULL, |
|
}; |
|
|
|
/* Performance monitoring unit for s390x */ |
|
static struct pmu cf_diag = { |
|
.task_ctx_nr = perf_sw_context, |
|
.pmu_enable = cf_diag_enable, |
|
.pmu_disable = cf_diag_disable, |
|
.event_init = cf_diag_event_init, |
|
.add = cf_diag_add, |
|
.del = cf_diag_del, |
|
.start = cf_diag_start, |
|
.stop = cf_diag_stop, |
|
.read = cf_diag_read, |
|
|
|
.attr_groups = cf_diag_attr_groups |
|
}; |
|
|
|
/* Get the CPU speed, try sampling facility first and CPU attributes second. */ |
|
static void cf_diag_get_cpu_speed(void) |
|
{ |
|
if (cpum_sf_avail()) { /* Sampling facility first */ |
|
struct hws_qsi_info_block si; |
|
|
|
memset(&si, 0, sizeof(si)); |
|
if (!qsi(&si)) { |
|
cf_diag_cpu_speed = si.cpu_speed; |
|
return; |
|
} |
|
} |
|
|
|
if (test_facility(34)) { /* CPU speed extract static part */ |
|
unsigned long mhz = __ecag(ECAG_CPU_ATTRIBUTE, 0); |
|
|
|
if (mhz != -1UL) |
|
cf_diag_cpu_speed = mhz & 0xffffffff; |
|
} |
|
} |
|
|
|
/* Code to create device and file I/O operations */ |
|
static atomic_t ctrset_opencnt = ATOMIC_INIT(0); /* Excl. access */ |
|
|
|
static int cf_diag_open(struct inode *inode, struct file *file) |
|
{ |
|
int err = 0; |
|
|
|
if (!capable(CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
if (atomic_xchg(&ctrset_opencnt, 1)) |
|
return -EBUSY; |
|
|
|
/* Avoid concurrent access with perf_event_open() system call */ |
|
mutex_lock(&cf_diag_reserve_mutex); |
|
if (atomic_read(&cf_diag_events) || __kernel_cpumcf_begin()) |
|
err = -EBUSY; |
|
mutex_unlock(&cf_diag_reserve_mutex); |
|
if (err) { |
|
atomic_set(&ctrset_opencnt, 0); |
|
return err; |
|
} |
|
file->private_data = NULL; |
|
debug_sprintf_event(cf_diag_dbg, 2, "%s\n", __func__); |
|
/* nonseekable_open() never fails */ |
|
return nonseekable_open(inode, file); |
|
} |
|
|
|
/* Variables for ioctl() interface support */ |
|
static DEFINE_MUTEX(cf_diag_ctrset_mutex); |
|
static struct cf_diag_ctrset { |
|
unsigned long ctrset; /* Bit mask of counter set to read */ |
|
cpumask_t mask; /* CPU mask to read from */ |
|
} cf_diag_ctrset; |
|
|
|
static void cf_diag_ctrset_clear(void) |
|
{ |
|
cpumask_clear(&cf_diag_ctrset.mask); |
|
cf_diag_ctrset.ctrset = 0; |
|
} |
|
|
|
static void cf_diag_release_cpu(void *p) |
|
{ |
|
struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); |
|
|
|
debug_sprintf_event(cf_diag_dbg, 3, "%s cpu %d\n", __func__, |
|
smp_processor_id()); |
|
lcctl(0); /* Reset counter sets */ |
|
cpuhw->state = 0; /* Save state in CPU hardware state */ |
|
} |
|
|
|
/* Release function is also called when application gets terminated without |
|
* doing a proper ioctl(..., S390_HWCTR_STOP, ...) command. |
|
* Since only one application is allowed to open the device, simple stop all |
|
* CPU counter sets. |
|
*/ |
|
static int cf_diag_release(struct inode *inode, struct file *file) |
|
{ |
|
on_each_cpu(cf_diag_release_cpu, NULL, 1); |
|
cf_diag_ctrset_clear(); |
|
atomic_set(&ctrset_opencnt, 0); |
|
__kernel_cpumcf_end(); |
|
debug_sprintf_event(cf_diag_dbg, 2, "%s\n", __func__); |
|
return 0; |
|
} |
|
|
|
struct cf_diag_call_on_cpu_parm { /* Parm struct for smp_call_on_cpu */ |
|
unsigned int sets; /* Counter set bit mask */ |
|
atomic_t cpus_ack; /* # CPUs successfully executed func */ |
|
}; |
|
|
|
static int cf_diag_all_copy(unsigned long arg, cpumask_t *mask) |
|
{ |
|
struct s390_ctrset_read __user *ctrset_read; |
|
unsigned int cpu, cpus, rc; |
|
void __user *uptr; |
|
|
|
ctrset_read = (struct s390_ctrset_read __user *)arg; |
|
uptr = ctrset_read->data; |
|
for_each_cpu(cpu, mask) { |
|
struct cf_diag_csd *csd = per_cpu_ptr(&cf_diag_csd, cpu); |
|
struct s390_ctrset_cpudata __user *ctrset_cpudata; |
|
|
|
ctrset_cpudata = uptr; |
|
debug_sprintf_event(cf_diag_dbg, 5, "%s cpu %d used %zd\n", |
|
__func__, cpu, csd->used); |
|
rc = put_user(cpu, &ctrset_cpudata->cpu_nr); |
|
rc |= put_user(csd->sets, &ctrset_cpudata->no_sets); |
|
rc |= copy_to_user(ctrset_cpudata->data, csd->data, csd->used); |
|
if (rc) |
|
return -EFAULT; |
|
uptr += sizeof(struct s390_ctrset_cpudata) + csd->used; |
|
cond_resched(); |
|
} |
|
cpus = cpumask_weight(mask); |
|
if (put_user(cpus, &ctrset_read->no_cpus)) |
|
return -EFAULT; |
|
debug_sprintf_event(cf_diag_dbg, 5, "%s copied %ld\n", |
|
__func__, uptr - (void __user *)ctrset_read->data); |
|
return 0; |
|
} |
|
|
|
static size_t cf_diag_cpuset_read(struct s390_ctrset_setdata *p, int ctrset, |
|
int ctrset_size, size_t room) |
|
{ |
|
size_t need = 0; |
|
int rc = -1; |
|
|
|
need = sizeof(*p) + sizeof(u64) * ctrset_size; |
|
debug_sprintf_event(cf_diag_dbg, 5, |
|
"%s room %zd need %zd set %#x set_size %d\n", |
|
__func__, room, need, ctrset, ctrset_size); |
|
if (need <= room) { |
|
p->set = cpumf_ctr_ctl[ctrset]; |
|
p->no_cnts = ctrset_size; |
|
rc = ctr_stcctm(ctrset, ctrset_size, (u64 *)p->cv); |
|
if (rc == 3) /* Nothing stored */ |
|
need = 0; |
|
} |
|
debug_sprintf_event(cf_diag_dbg, 5, "%s need %zd rc %d\n", __func__, |
|
need, rc); |
|
return need; |
|
} |
|
|
|
/* Read all counter sets. Since the perf_event_open() system call with |
|
* event cpum_cf_diag/.../ is blocked when this interface is active, reuse |
|
* the perf_event_open() data buffer to store the counter sets. |
|
*/ |
|
static void cf_diag_cpu_read(void *parm) |
|
{ |
|
struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); |
|
struct cf_diag_csd *csd = this_cpu_ptr(&cf_diag_csd); |
|
struct cf_diag_call_on_cpu_parm *p = parm; |
|
int set, set_size; |
|
size_t space; |
|
|
|
debug_sprintf_event(cf_diag_dbg, 5, |
|
"%s new %#x flags %#x state %#llx\n", |
|
__func__, p->sets, cpuhw->flags, |
|
cpuhw->state); |
|
/* No data saved yet */ |
|
csd->used = 0; |
|
csd->sets = 0; |
|
memset(csd->data, 0, sizeof(csd->data)); |
|
|
|
/* Scan the counter sets */ |
|
for (set = CPUMF_CTR_SET_BASIC; set < CPUMF_CTR_SET_MAX; ++set) { |
|
struct s390_ctrset_setdata *sp = (void *)csd->data + csd->used; |
|
|
|
if (!(p->sets & cpumf_ctr_ctl[set])) |
|
continue; /* Counter set not in list */ |
|
set_size = cf_diag_ctrset_size(set, &cpuhw->info); |
|
space = sizeof(csd->data) - csd->used; |
|
space = cf_diag_cpuset_read(sp, set, set_size, space); |
|
if (space) { |
|
csd->used += space; |
|
csd->sets += 1; |
|
} |
|
debug_sprintf_event(cf_diag_dbg, 5, "%s sp %px space %zd\n", |
|
__func__, sp, space); |
|
} |
|
debug_sprintf_event(cf_diag_dbg, 5, "%s sets %d used %zd\n", __func__, |
|
csd->sets, csd->used); |
|
} |
|
|
|
static int cf_diag_all_read(unsigned long arg) |
|
{ |
|
struct cf_diag_call_on_cpu_parm p; |
|
cpumask_var_t mask; |
|
int rc; |
|
|
|
debug_sprintf_event(cf_diag_dbg, 5, "%s\n", __func__); |
|
if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
|
return -ENOMEM; |
|
|
|
p.sets = cf_diag_ctrset.ctrset; |
|
cpumask_and(mask, &cf_diag_ctrset.mask, cpu_online_mask); |
|
on_each_cpu_mask(mask, cf_diag_cpu_read, &p, 1); |
|
rc = cf_diag_all_copy(arg, mask); |
|
free_cpumask_var(mask); |
|
debug_sprintf_event(cf_diag_dbg, 5, "%s rc %d\n", __func__, rc); |
|
return rc; |
|
} |
|
|
|
/* Stop all counter sets via ioctl interface */ |
|
static void cf_diag_ioctl_off(void *parm) |
|
{ |
|
struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); |
|
struct cf_diag_call_on_cpu_parm *p = parm; |
|
int rc; |
|
|
|
debug_sprintf_event(cf_diag_dbg, 5, |
|
"%s new %#x flags %#x state %#llx\n", |
|
__func__, p->sets, cpuhw->flags, |
|
cpuhw->state); |
|
|
|
ctr_set_multiple_disable(&cpuhw->state, p->sets); |
|
ctr_set_multiple_stop(&cpuhw->state, p->sets); |
|
rc = lcctl(cpuhw->state); /* Stop counter sets */ |
|
if (!cpuhw->state) |
|
cpuhw->flags &= ~PMU_F_IN_USE; |
|
debug_sprintf_event(cf_diag_dbg, 5, |
|
"%s rc %d flags %#x state %#llx\n", __func__, |
|
rc, cpuhw->flags, cpuhw->state); |
|
} |
|
|
|
/* Start counter sets on particular CPU */ |
|
static void cf_diag_ioctl_on(void *parm) |
|
{ |
|
struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); |
|
struct cf_diag_call_on_cpu_parm *p = parm; |
|
int rc; |
|
|
|
debug_sprintf_event(cf_diag_dbg, 5, |
|
"%s new %#x flags %#x state %#llx\n", |
|
__func__, p->sets, cpuhw->flags, |
|
cpuhw->state); |
|
|
|
if (!(cpuhw->flags & PMU_F_IN_USE)) |
|
cpuhw->state = 0; |
|
cpuhw->flags |= PMU_F_IN_USE; |
|
rc = lcctl(cpuhw->state); /* Reset unused counter sets */ |
|
ctr_set_multiple_enable(&cpuhw->state, p->sets); |
|
ctr_set_multiple_start(&cpuhw->state, p->sets); |
|
rc |= lcctl(cpuhw->state); /* Start counter sets */ |
|
if (!rc) |
|
atomic_inc(&p->cpus_ack); |
|
debug_sprintf_event(cf_diag_dbg, 5, "%s rc %d state %#llx\n", |
|
__func__, rc, cpuhw->state); |
|
} |
|
|
|
static int cf_diag_all_stop(void) |
|
{ |
|
struct cf_diag_call_on_cpu_parm p = { |
|
.sets = cf_diag_ctrset.ctrset, |
|
}; |
|
cpumask_var_t mask; |
|
|
|
if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
|
return -ENOMEM; |
|
cpumask_and(mask, &cf_diag_ctrset.mask, cpu_online_mask); |
|
on_each_cpu_mask(mask, cf_diag_ioctl_off, &p, 1); |
|
free_cpumask_var(mask); |
|
return 0; |
|
} |
|
|
|
static int cf_diag_all_start(void) |
|
{ |
|
struct cf_diag_call_on_cpu_parm p = { |
|
.sets = cf_diag_ctrset.ctrset, |
|
.cpus_ack = ATOMIC_INIT(0), |
|
}; |
|
cpumask_var_t mask; |
|
int rc = 0; |
|
|
|
if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
|
return -ENOMEM; |
|
cpumask_and(mask, &cf_diag_ctrset.mask, cpu_online_mask); |
|
on_each_cpu_mask(mask, cf_diag_ioctl_on, &p, 1); |
|
if (atomic_read(&p.cpus_ack) != cpumask_weight(mask)) { |
|
on_each_cpu_mask(mask, cf_diag_ioctl_off, &p, 1); |
|
rc = -EIO; |
|
} |
|
free_cpumask_var(mask); |
|
return rc; |
|
} |
|
|
|
/* Return the maximum required space for all possible CPUs in case one |
|
* CPU will be onlined during the START, READ, STOP cycles. |
|
* To find out the size of the counter sets, any one CPU will do. They |
|
* all have the same counter sets. |
|
*/ |
|
static size_t cf_diag_needspace(unsigned int sets) |
|
{ |
|
struct cpu_cf_events *cpuhw = get_cpu_ptr(&cpu_cf_events); |
|
size_t bytes = 0; |
|
int i; |
|
|
|
for (i = CPUMF_CTR_SET_BASIC; i < CPUMF_CTR_SET_MAX; ++i) { |
|
if (!(sets & cpumf_ctr_ctl[i])) |
|
continue; |
|
bytes += cf_diag_ctrset_size(i, &cpuhw->info) * sizeof(u64) + |
|
sizeof(((struct s390_ctrset_setdata *)0)->set) + |
|
sizeof(((struct s390_ctrset_setdata *)0)->no_cnts); |
|
} |
|
bytes = sizeof(((struct s390_ctrset_read *)0)->no_cpus) + nr_cpu_ids * |
|
(bytes + sizeof(((struct s390_ctrset_cpudata *)0)->cpu_nr) + |
|
sizeof(((struct s390_ctrset_cpudata *)0)->no_sets)); |
|
debug_sprintf_event(cf_diag_dbg, 5, "%s bytes %ld\n", __func__, |
|
bytes); |
|
put_cpu_ptr(&cpu_cf_events); |
|
return bytes; |
|
} |
|
|
|
static long cf_diag_ioctl_read(unsigned long arg) |
|
{ |
|
struct s390_ctrset_read read; |
|
int ret = 0; |
|
|
|
debug_sprintf_event(cf_diag_dbg, 5, "%s\n", __func__); |
|
if (copy_from_user(&read, (char __user *)arg, sizeof(read))) |
|
return -EFAULT; |
|
ret = cf_diag_all_read(arg); |
|
debug_sprintf_event(cf_diag_dbg, 5, "%s ret %d\n", __func__, ret); |
|
return ret; |
|
} |
|
|
|
static long cf_diag_ioctl_stop(void) |
|
{ |
|
int ret; |
|
|
|
debug_sprintf_event(cf_diag_dbg, 5, "%s\n", __func__); |
|
ret = cf_diag_all_stop(); |
|
cf_diag_ctrset_clear(); |
|
debug_sprintf_event(cf_diag_dbg, 5, "%s ret %d\n", __func__, ret); |
|
return ret; |
|
} |
|
|
|
static long cf_diag_ioctl_start(unsigned long arg) |
|
{ |
|
struct s390_ctrset_start __user *ustart; |
|
struct s390_ctrset_start start; |
|
void __user *umask; |
|
unsigned int len; |
|
int ret = 0; |
|
size_t need; |
|
|
|
if (cf_diag_ctrset.ctrset) |
|
return -EBUSY; |
|
ustart = (struct s390_ctrset_start __user *)arg; |
|
if (copy_from_user(&start, ustart, sizeof(start))) |
|
return -EFAULT; |
|
if (start.version != S390_HWCTR_START_VERSION) |
|
return -EINVAL; |
|
if (start.counter_sets & ~(cpumf_ctr_ctl[CPUMF_CTR_SET_BASIC] | |
|
cpumf_ctr_ctl[CPUMF_CTR_SET_USER] | |
|
cpumf_ctr_ctl[CPUMF_CTR_SET_CRYPTO] | |
|
cpumf_ctr_ctl[CPUMF_CTR_SET_EXT] | |
|
cpumf_ctr_ctl[CPUMF_CTR_SET_MT_DIAG])) |
|
return -EINVAL; /* Invalid counter set */ |
|
if (!start.counter_sets) |
|
return -EINVAL; /* No counter set at all? */ |
|
cpumask_clear(&cf_diag_ctrset.mask); |
|
len = min_t(u64, start.cpumask_len, cpumask_size()); |
|
umask = (void __user *)start.cpumask; |
|
if (copy_from_user(&cf_diag_ctrset.mask, umask, len)) |
|
return -EFAULT; |
|
if (cpumask_empty(&cf_diag_ctrset.mask)) |
|
return -EINVAL; |
|
need = cf_diag_needspace(start.counter_sets); |
|
if (put_user(need, &ustart->data_bytes)) |
|
ret = -EFAULT; |
|
if (ret) |
|
goto out; |
|
cf_diag_ctrset.ctrset = start.counter_sets; |
|
ret = cf_diag_all_start(); |
|
out: |
|
if (ret) |
|
cf_diag_ctrset_clear(); |
|
debug_sprintf_event(cf_diag_dbg, 2, "%s sets %#lx need %ld ret %d\n", |
|
__func__, cf_diag_ctrset.ctrset, need, ret); |
|
return ret; |
|
} |
|
|
|
static long cf_diag_ioctl(struct file *file, unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
int ret; |
|
|
|
debug_sprintf_event(cf_diag_dbg, 2, "%s cmd %#x arg %lx\n", __func__, |
|
cmd, arg); |
|
get_online_cpus(); |
|
mutex_lock(&cf_diag_ctrset_mutex); |
|
switch (cmd) { |
|
case S390_HWCTR_START: |
|
ret = cf_diag_ioctl_start(arg); |
|
break; |
|
case S390_HWCTR_STOP: |
|
ret = cf_diag_ioctl_stop(); |
|
break; |
|
case S390_HWCTR_READ: |
|
ret = cf_diag_ioctl_read(arg); |
|
break; |
|
default: |
|
ret = -ENOTTY; |
|
break; |
|
} |
|
mutex_unlock(&cf_diag_ctrset_mutex); |
|
put_online_cpus(); |
|
debug_sprintf_event(cf_diag_dbg, 2, "%s ret %d\n", __func__, ret); |
|
return ret; |
|
} |
|
|
|
static const struct file_operations cf_diag_fops = { |
|
.owner = THIS_MODULE, |
|
.open = cf_diag_open, |
|
.release = cf_diag_release, |
|
.unlocked_ioctl = cf_diag_ioctl, |
|
.compat_ioctl = cf_diag_ioctl, |
|
.llseek = no_llseek |
|
}; |
|
|
|
static struct miscdevice cf_diag_dev = { |
|
.name = S390_HWCTR_DEVICE, |
|
.minor = MISC_DYNAMIC_MINOR, |
|
.fops = &cf_diag_fops, |
|
}; |
|
|
|
static int cf_diag_online_cpu(unsigned int cpu) |
|
{ |
|
struct cf_diag_call_on_cpu_parm p; |
|
|
|
mutex_lock(&cf_diag_ctrset_mutex); |
|
if (!cf_diag_ctrset.ctrset) |
|
goto out; |
|
p.sets = cf_diag_ctrset.ctrset; |
|
cf_diag_ioctl_on(&p); |
|
out: |
|
mutex_unlock(&cf_diag_ctrset_mutex); |
|
return 0; |
|
} |
|
|
|
static int cf_diag_offline_cpu(unsigned int cpu) |
|
{ |
|
struct cf_diag_call_on_cpu_parm p; |
|
|
|
mutex_lock(&cf_diag_ctrset_mutex); |
|
if (!cf_diag_ctrset.ctrset) |
|
goto out; |
|
p.sets = cf_diag_ctrset.ctrset; |
|
cf_diag_ioctl_off(&p); |
|
out: |
|
mutex_unlock(&cf_diag_ctrset_mutex); |
|
return 0; |
|
} |
|
|
|
/* Initialize the counter set PMU to generate complete counter set data as |
|
* event raw data. This relies on the CPU Measurement Counter Facility device |
|
* already being loaded and initialized. |
|
*/ |
|
static int __init cf_diag_init(void) |
|
{ |
|
struct cpumf_ctr_info info; |
|
size_t need; |
|
int rc; |
|
|
|
if (!kernel_cpumcf_avail() || !stccm_avail() || qctri(&info)) |
|
return -ENODEV; |
|
cf_diag_get_cpu_speed(); |
|
|
|
/* Make sure the counter set data fits into predefined buffer. */ |
|
need = cf_diag_ctrset_maxsize(&info); |
|
if (need > sizeof(((struct cf_diag_csd *)0)->start)) { |
|
pr_err("Insufficient memory for PMU(cpum_cf_diag) need=%zu\n", |
|
need); |
|
return -ENOMEM; |
|
} |
|
|
|
rc = misc_register(&cf_diag_dev); |
|
if (rc) { |
|
pr_err("Registration of /dev/" S390_HWCTR_DEVICE |
|
"failed rc=%d\n", rc); |
|
goto out; |
|
} |
|
|
|
/* Setup s390dbf facility */ |
|
cf_diag_dbg = debug_register(KMSG_COMPONENT, 2, 1, 128); |
|
if (!cf_diag_dbg) { |
|
pr_err("Registration of s390dbf(cpum_cf_diag) failed\n"); |
|
rc = -ENOMEM; |
|
goto out_dbf; |
|
} |
|
debug_register_view(cf_diag_dbg, &debug_sprintf_view); |
|
|
|
rc = perf_pmu_register(&cf_diag, "cpum_cf_diag", -1); |
|
if (rc) { |
|
pr_err("Registration of PMU(cpum_cf_diag) failed with rc=%i\n", |
|
rc); |
|
goto out_perf; |
|
} |
|
rc = cpuhp_setup_state_nocalls(CPUHP_AP_PERF_S390_CFD_ONLINE, |
|
"perf/s390/cfd:online", |
|
cf_diag_online_cpu, cf_diag_offline_cpu); |
|
if (!rc) |
|
goto out; |
|
|
|
pr_err("Registration of CPUHP_AP_PERF_S390_CFD_ONLINE failed rc=%i\n", |
|
rc); |
|
perf_pmu_unregister(&cf_diag); |
|
out_perf: |
|
debug_unregister_view(cf_diag_dbg, &debug_sprintf_view); |
|
debug_unregister(cf_diag_dbg); |
|
out_dbf: |
|
misc_deregister(&cf_diag_dev); |
|
out: |
|
return rc; |
|
} |
|
device_initcall(cf_diag_init);
|
|
|