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Date: Tue, 20 Oct 2015 14:05:23 +0100
From: "Suzuki K. Poulose" <suzuki.poulose@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: punit.agrawal@....com, mark.rutland@....com, arm@...nel.org,
linux-kernel@...r.kernel.org,
"Suzuki K. Poulose" <suzuki.poulose@....com>
Subject: [PATCHv2 1/4] arm-cci: Refactor CCI PMU code
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>
Cc: arm@...nel.org
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@....com>
---
drivers/bus/arm-cci.c | 94 +++++++++++++++++++++++++++++--------------------
1 file changed, 56 insertions(+), 38 deletions(-)
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index 577cc4b..5435d87 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -738,6 +738,53 @@ static void pmu_free_irq(struct cci_pmu *cci_pmu)
}
}
+/* Should be called with cci_pmu->hw_events->pmu_lock */
+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 */
+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 void cci_pmu_enable(struct pmu *pmu)
+{
+ struct cci_pmu *cci_pmu = to_cci_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;
+
+ if (!enabled)
+ return;
+
+ raw_spin_lock_irqsave(&hw_events->pmu_lock, flags);
+ __cci_pmu_enable();
+ raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
+
+}
+
+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;
+
+ raw_spin_lock_irqsave(&hw_events->pmu_lock, flags);
+ __cci_pmu_disable();
+ raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
+}
+
static u32 pmu_read_counter(struct perf_event *event)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
@@ -754,16 +801,22 @@ static u32 pmu_read_counter(struct perf_event *event)
return value;
}
+static void __pmu_write_counter(struct cci_pmu *cci_pmu, int idx, u32 value)
+{
+ pmu_write_register(cci_pmu, value, idx, CCI_PMU_CNTR);
+}
+
static void pmu_write_counter(struct perf_event *event, u32 value)
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct hw_perf_event *hw_counter = &event->hw;
int idx = hw_counter->idx;
- if (unlikely(!pmu_is_valid_counter(cci_pmu, idx)))
+ if (unlikely(!pmu_is_valid_counter(cci_pmu, idx))) {
dev_err(&cci_pmu->plat_device->dev, "Invalid CCI PMU counter %d\n", idx);
- else
- pmu_write_register(cci_pmu, value, idx, CCI_PMU_CNTR);
+ return;
+ }
+ __pmu_write_counter(cci_pmu, idx, value);
}
static u64 pmu_event_update(struct perf_event *event)
@@ -869,41 +922,6 @@ static void hw_perf_event_destroy(struct perf_event *event)
}
}
-static void cci_pmu_enable(struct pmu *pmu)
-{
- struct cci_pmu *cci_pmu = to_cci_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);
- raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
-
-}
-
-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);
- raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
-}
-
/*
* Check if the idx represents a non-programmable counter.
* All the fixed event counters are mapped before the programmable
--
1.7.9.5
--
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