linux-kernel - [tip: perf/core] perf/x86/amd: Remove driver-specific throttle support

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Message-ID: <174782976165.406.16164721635460148194.tip-bot2@tip-bot2>
Date: Wed, 21 May 2025 12:16:01 -0000
From: "tip-bot2 for Kan Liang" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Kan Liang <kan.liang@...ux.intel.com>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Ravi Bangoria <ravi.bangoria@....com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: perf/core] perf/x86/amd: Remove driver-specific throttle support

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     d058c7d538e77297fe721d4d2e679ca7d2eff69b
Gitweb:        https://git.kernel.org/tip/d058c7d538e77297fe721d4d2e679ca7d2eff69b
Author:        Kan Liang <kan.liang@...ux.intel.com>
AuthorDate:    Tue, 20 May 2025 11:16:32 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 21 May 2025 13:57:43 +02:00

perf/x86/amd: Remove driver-specific throttle support

The throttle support has been added in the generic code. Remove
the driver-specific throttle support.

Besides the throttle, perf_event_overflow may return true because of
event_limit. It already does an inatomic event disable. The pmu->stop
is not required either.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Ravi Bangoria <ravi.bangoria@....com>
Link: https://lore.kernel.org/r/20250520181644.2673067-5-kan.liang@linux.intel.com
---
 arch/x86/events/amd/core.c | 3 +--
 arch/x86/events/amd/ibs.c  | 4 +---
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index 30d6ceb..5e64283 100644
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -1003,8 +1003,7 @@ static int amd_pmu_v2_handle_irq(struct pt_regs *regs)
 
 		perf_sample_save_brstack(&data, event, &cpuc->lbr_stack, NULL);
 
-		if (perf_event_overflow(event, &data, regs))
-			x86_pmu_stop(event, 0);
+		perf_event_overflow(event, &data, regs);
 	}
 
 	/*
diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c
index 0252b7e..4bbbca0 100644
--- a/arch/x86/events/amd/ibs.c
+++ b/arch/x86/events/amd/ibs.c
@@ -1373,9 +1373,7 @@ fail:
 		hwc->sample_period = perf_ibs->min_period;
 
 out:
-	if (throttle) {
-		perf_ibs_stop(event, 0);
-	} else {
+	if (!throttle) {
 		if (perf_ibs == &perf_ibs_op) {
 			if (ibs_caps & IBS_CAPS_OPCNTEXT) {
 				new_config = period & IBS_OP_MAX_CNT_EXT_MASK;