linux-kernel - [PATCH v5 03/11] arm-cci: Group writes to counter

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1451908490-2615-4-git-send-email-suzuki.poulose@arm.com>
Date:	Mon,  4 Jan 2016 11:54:42 +0000
From:	"Suzuki K. Poulose" <suzuki.poulose@....com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, arm@...nel.org, mark.rutland@....com,
	punit.agrawal@....com, peterz@...radead.org,
	"Suzuki K. Poulose" <suzuki.poulose@....com>
Subject: [PATCH v5 03/11] arm-cci: Group writes to counter

Add a helper to group the writes to PMU counter, this will be
used to delay setting the event period to pmu::pmu_enable()

Cc: Mark Rutland <mark.rutland@....com>
Cc: Punit Agrawal <punit.agrawal@....com>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@....com>
---
 drivers/bus/arm-cci.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index ce0d3ef..f6b8717 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -785,6 +785,21 @@ static void pmu_write_counter(struct perf_event *event, u32 value)
 	__pmu_write_counter(cci_pmu, value, idx);
 }
 
+/* Write a value to a given set of counters */
+static void __pmu_write_counters(struct cci_pmu *cci_pmu, unsigned long *mask, u32 value)
+{
+	int i;
+
+	for_each_set_bit(i, mask, cci_pmu->num_cntrs)
+		__pmu_write_counter(cci_pmu, value, i);
+}
+
+static void __maybe_unused
+pmu_write_counters(struct cci_pmu *cci_pmu, unsigned long *mask, u32 value)
+{
+	__pmu_write_counters(cci_pmu, mask, value);
+}
+
 static u64 pmu_event_update(struct perf_event *event)
 {
 	struct hw_perf_event *hwc = &event->hw;
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/