diff mbox series

[v4,2/4] perf/x86/amd: avoid taking branches before disabling LBR

Message ID 20240331041830.2806741-3-andrii@kernel.org (mailing list archive)
State Superseded
Headers show
Series perf/x86/amd: add LBR capture support outside of hardware events | expand

Checks

Context Check Description
netdev/tree_selection success Not a local patch

Commit Message

Andrii Nakryiko March 31, 2024, 4:18 a.m. UTC 
In the following patches we will enable LBR capture on AMD CPUs at
arbitrary point in time, which means that LBR recording won't be frozen
by hardware automatically as part of hardware overflow event. So we need
to take care to minimize amount of branches and function calls/returns
on the path to freezing LBR, minimizing LBR snapshot altering as much as
possible.

As such, split out LBR disabling logic from the sanity checking logic
inside amd_pmu_lbr_disable_all(). This will ensure that no branches are
taken before LBR is frozen in the functionality added in the next patch.
Use __always_inline to also eliminate any possible function calls.

Reviewed-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
 arch/x86/events/amd/lbr.c    |  7 +------
 arch/x86/events/perf_event.h | 11 +++++++++++
 2 files changed, 12 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/events/amd/lbr.c b/arch/x86/events/amd/lbr.c
index 4a1e600314d5..0e4de028590d 100644
--- a/arch/x86/events/amd/lbr.c
+++ b/arch/x86/events/amd/lbr.c
@@ -412,16 +412,11 @@  void amd_pmu_lbr_enable_all(void)
 void amd_pmu_lbr_disable_all(void)
 {
 	struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
-	u64 dbg_ctl, dbg_extn_cfg;
 
 	if (!cpuc->lbr_users || !x86_pmu.lbr_nr)
 		return;
 
-	rdmsrl(MSR_AMD_DBG_EXTN_CFG, dbg_extn_cfg);
-	rdmsrl(MSR_IA32_DEBUGCTLMSR, dbg_ctl);
-
-	wrmsrl(MSR_AMD_DBG_EXTN_CFG, dbg_extn_cfg & ~DBG_EXTN_CFG_LBRV2EN);
-	wrmsrl(MSR_IA32_DEBUGCTLMSR, dbg_ctl & ~DEBUGCTLMSR_FREEZE_LBRS_ON_PMI);
+	__amd_pmu_lbr_disable();
 }
 
 __init int amd_pmu_lbr_init(void)
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index fb56518356ec..4dddf0a7e81e 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -1329,6 +1329,17 @@  void amd_pmu_lbr_enable_all(void);
 void amd_pmu_lbr_disable_all(void);
 int amd_pmu_lbr_hw_config(struct perf_event *event);
 
+static __always_inline void __amd_pmu_lbr_disable(void)
+{
+	u64 dbg_ctl, dbg_extn_cfg;
+
+	rdmsrl(MSR_AMD_DBG_EXTN_CFG, dbg_extn_cfg);
+	rdmsrl(MSR_IA32_DEBUGCTLMSR, dbg_ctl);
+
+	wrmsrl(MSR_AMD_DBG_EXTN_CFG, dbg_extn_cfg & ~DBG_EXTN_CFG_LBRV2EN);
+	wrmsrl(MSR_IA32_DEBUGCTLMSR, dbg_ctl & ~DEBUGCTLMSR_FREEZE_LBRS_ON_PMI);
+}
+
 #ifdef CONFIG_PERF_EVENTS_AMD_BRS
 
 #define AMD_FAM19H_BRS_EVENT 0xc4 /* RETIRED_TAKEN_BRANCH_INSTRUCTIONS */