linux-kernel - [PATCHv3 1/5] arm-cci: Refactor CCI PMU enable/disable methods

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Message-Id: <1447783407-18027-2-git-send-email-suzuki.poulose@arm.com>
Date:	Tue, 17 Nov 2015 18:03:23 +0000
From:	"Suzuki K. Poulose" <suzuki.poulose@....com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	mark.rutland@....com, punit.agrawal@....com, arm@...nel.org,
	linux-kernel@...r.kernel.org,
	"Suzuki K. Poulose" <suzuki.poulose@....com>
Subject: [PATCHv3 1/5] arm-cci: Refactor CCI PMU enable/disable methods

This patch refactors the CCI PMU driver code a little bit to
make it easier share the code for enabling/disabling the CCI
PMU. This will be used by the hooks to work around the special cases
where writing to a counter is not always that easy(e.g, CCI-500)

No functional changes.

Cc: Punit Agrawal <punit.agrawal@....com>
Cc: Mark Rutland <mark.rutland@....com>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@....com>
---
 drivers/bus/arm-cci.c |   32 ++++++++++++++++++++++----------
 1 file changed, 22 insertions(+), 10 deletions(-)

diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index ee47e6b..f5793b9 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -667,6 +667,26 @@ static u32 pmu_get_max_counters(void)
 		CCI_PMCR_NCNT_MASK) >> CCI_PMCR_NCNT_SHIFT;
 }
 
+/* Should be called with cci_pmu->hw_events->pmu_lock held */
+static void __cci_pmu_enable(void)
+{
+	u32 val;
+
+	/* Enable all the PMU counters. */
+	val = readl_relaxed(cci_ctrl_base + CCI_PMCR) | CCI_PMCR_CEN;
+	writel(val, cci_ctrl_base + CCI_PMCR);
+}
+
+/* Should be called with cci_pmu->hw_events->pmu_lock held */
+static void __cci_pmu_disable(void)
+{
+	u32 val;
+
+	/* Disable all the PMU counters. */
+	val = readl_relaxed(cci_ctrl_base + CCI_PMCR) & ~CCI_PMCR_CEN;
+	writel(val, cci_ctrl_base + CCI_PMCR);
+}
+
 static int pmu_get_event_idx(struct cci_pmu_hw_events *hw, struct perf_event *event)
 {
 	struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
@@ -880,16 +900,12 @@ static void cci_pmu_enable(struct pmu *pmu)
 	struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
 	int enabled = bitmap_weight(hw_events->used_mask, cci_pmu->num_cntrs);
 	unsigned long flags;
-	u32 val;
 
 	if (!enabled)
 		return;
 
 	raw_spin_lock_irqsave(&hw_events->pmu_lock, flags);
-
-	/* Enable all the PMU counters. */
-	val = readl_relaxed(cci_ctrl_base + CCI_PMCR) | CCI_PMCR_CEN;
-	writel(val, cci_ctrl_base + CCI_PMCR);
+	__cci_pmu_enable();
 	raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
 
 }
@@ -899,13 +915,9 @@ static void cci_pmu_disable(struct pmu *pmu)
 	struct cci_pmu *cci_pmu = to_cci_pmu(pmu);
 	struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
 	unsigned long flags;
-	u32 val;
 
 	raw_spin_lock_irqsave(&hw_events->pmu_lock, flags);
-
-	/* Disable all the PMU counters. */
-	val = readl_relaxed(cci_ctrl_base + CCI_PMCR) & ~CCI_PMCR_CEN;
-	writel(val, cci_ctrl_base + CCI_PMCR);
+	__cci_pmu_disable();
 	raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
 }
 
-- 
1.7.9.5

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