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| author |   Hendrik Brueckner <brueckner@linux.ibm.com> | 2018-08-08 10:30:37 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2019-02-22 09:19:50 +0100 |
| commit | 26b8317f51a20c1e4f61fbd2cc68975faad10b02 (patch) | |
| tree | e59b0ea3f327d7ea6f6a460fe0837000273c7561 /arch/s390/kernel | |
| parent | s390/cpu_mf: move struct cpu_cf_events and per-CPU variable to header file (diff) | |
| download | linux-dev-26b8317f51a20c1e4f61fbd2cc68975faad10b02.tar.xz linux-dev-26b8317f51a20c1e4f61fbd2cc68975faad10b02.zip | |
s390/cpum_cf: introduce kernel_cpumcf_alert() to obtain measurement alerts
During a __kernel_cpumcf_begin()/end() session, save measurement alerts
for the counter facility in the per-CPU cpu_cf_events variable.
Users can obtain and, optionally, clear the alerts by calling
kernel_cpumcf_alert() to specifically handle alerts.
Signed-off-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/perf_cpum_cf.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c index 758cbb1b84f5..c05f69142ce4 100644 --- a/arch/s390/kernel/perf_cpum_cf.c +++ b/arch/s390/kernel/perf_cpum_cf.c @@ -27,6 +27,7 @@ DEFINE_PER_CPU(struct cpu_cf_events, cpu_cf_events) = { [CPUMF_CTR_SET_EXT] = ATOMIC_INIT(0), [CPUMF_CTR_SET_MT_DIAG] = ATOMIC_INIT(0), }, + .alert = ATOMIC64_INIT(0), .state = 0, .flags = 0, .txn_flags = 0, @@ -205,6 +206,9 @@ static void cpumf_measurement_alert(struct ext_code ext_code, if (alert & CPU_MF_INT_CF_MTDA) pr_warn("CPU[%i] MT counter data was lost\n", smp_processor_id()); + + /* store alert for special handling by in-kernel users */ + atomic64_or(alert, &cpuhw->alert); } #define PMC_INIT 0 @@ -255,6 +259,20 @@ int __kernel_cpumcf_begin(void) } EXPORT_SYMBOL(__kernel_cpumcf_begin); +/* Obtain the CPU-measurement alerts for the counter facility */ +unsigned long kernel_cpumcf_alert(int clear) +{ + struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events); + unsigned long alert; + + alert = atomic64_read(&cpuhw->alert); + if (clear) + atomic64_set(&cpuhw->alert, 0); + + return alert; +} +EXPORT_SYMBOL(kernel_cpumcf_alert); + /* Release the CPU-measurement counter facility */ void __kernel_cpumcf_end(void) { |