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perf/x86: Add hw_perf_event::aux_config

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Start a new section for AUX PMUs in hw_perf_event.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
This commit is contained in:
Peter Zijlstra 2024-07-18 10:21:49 +02:00
parent d92792a4b2
commit 52c3fb1a0f
2 changed files with 10 additions and 7 deletions
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14
arch/x86/events/intel/pt.c
View File

@ -416,7 +416,7 @@ static bool pt_event_valid(struct perf_event *event)
static void pt_config_start(struct perf_event *event)
{
struct pt *pt = this_cpu_ptr(&pt_ctx);
u64 ctl = event->hw.config;
u64 ctl = event->hw.aux_config;
ctl |= RTIT_CTL_TRACEEN;
if (READ_ONCE(pt->vmx_on))
@ -424,7 +424,7 @@ static void pt_config_start(struct perf_event *event)
else
wrmsrl(MSR_IA32_RTIT_CTL, ctl);
WRITE_ONCE(event->hw.config, ctl);
WRITE_ONCE(event->hw.aux_config, ctl);
}
/* Address ranges and their corresponding msr configuration registers */
@ -503,7 +503,7 @@ static void pt_config(struct perf_event *event)
u64 reg;
/* First round: clear STATUS, in particular the PSB byte counter. */
if (!event->hw.config) {
if (!event->hw.aux_config) {
perf_event_itrace_started(event);
wrmsrl(MSR_IA32_RTIT_STATUS, 0);
}
@ -533,14 +533,14 @@ static void pt_config(struct perf_event *event)
reg |= (event->attr.config & PT_CONFIG_MASK);
event->hw.config = reg;
event->hw.aux_config = reg;
pt_config_start(event);
}
static void pt_config_stop(struct perf_event *event)
{
struct pt *pt = this_cpu_ptr(&pt_ctx);
u64 ctl = READ_ONCE(event->hw.config);
u64 ctl = READ_ONCE(event->hw.aux_config);
/* may be already stopped by a PMI */
if (!(ctl & RTIT_CTL_TRACEEN))
@ -550,7 +550,7 @@ static void pt_config_stop(struct perf_event *event)
if (!READ_ONCE(pt->vmx_on))
wrmsrl(MSR_IA32_RTIT_CTL, ctl);
WRITE_ONCE(event->hw.config, ctl);
WRITE_ONCE(event->hw.aux_config, ctl);
/*
* A wrmsr that disables trace generation serializes other PT
@ -1557,7 +1557,7 @@ void intel_pt_handle_vmx(int on)
/* Turn PTs back on */
if (!on && event)
wrmsrl(MSR_IA32_RTIT_CTL, event->hw.config);
wrmsrl(MSR_IA32_RTIT_CTL, event->hw.aux_config);
local_irq_restore(flags);
}

3
include/linux/perf_event.h
View File

@ -168,6 +168,9 @@ struct hw_perf_event {
struct hw_perf_event_extra extra_reg;
struct hw_perf_event_extra branch_reg;
};
struct { /* aux / Intel-PT */
u64 aux_config;
};
struct { /* software */
struct hrtimer hrtimer;
};