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Message-id: <20140314141140.8c05452abfa2375b739845d6@samsung.com>
Date: Fri, 14 Mar 2014 14:11:40 +0900
From: Cho KyongHo <pullip.cho@...sung.com>
To: Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>,
Linux DeviceTree <devicetree@...r.kernel.org>,
Linux IOMMU <iommu@...ts.linux-foundation.org>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>
Cc: Antonios Motakis <a.motakis@...tualopensystems.com>,
Grant Grundler <grundler@...omium.org>,
Joerg Roedel <joro@...tes.org>,
Kukjin Kim <kgene.kim@...sung.com>,
Prathyush <prathyush.k@...sung.com>,
Rahul Sharma <rahul.sharma@...sung.com>,
Sachin Kamat <sachin.kamat@...aro.org>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Tomasz Figa <t.figa@...sung.com>,
Varun Sethi <Varun.Sethi@...escale.com>
Subject: [PATCH v11 21/27] iommu/exynos: change rwlock to spinlock
Since acquiring read_lock is not more frequent than write_lock, it is
not beneficial to use rwlock, this commit changes rwlock to spinlock.
Reviewed-by: Grant Grundler <grundler@...omium.org>
Signed-off-by: Cho KyongHo <pullip.cho@...sung.com>
---
drivers/iommu/exynos-iommu.c | 39 ++++++++++++++++++++-------------------
1 file changed, 20 insertions(+), 19 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 7489343..543ea2e0 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -211,7 +211,7 @@ struct sysmmu_drvdata {
struct clk *clk;
struct clk *clk_master;
int activations;
- rwlock_t lock;
+ spinlock_t lock;
struct iommu_domain *domain;
bool runtime_active;
bool suspended;
@@ -334,11 +334,12 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
unsigned long addr = -1;
int ret = -ENOSYS;
- read_lock(&data->lock);
-
WARN_ON(!is_sysmmu_active(data));
+ spin_lock(&data->lock);
+
__master_clk_enable(data);
+
itype = (enum exynos_sysmmu_inttype)
__ffs(__raw_readl(data->sfrbase + REG_INT_STATUS));
if (WARN_ON(!((itype >= 0) && (itype < SYSMMU_FAULT_UNKNOWN))))
@@ -371,7 +372,7 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
__master_clk_disable(data);
- read_unlock(&data->lock);
+ spin_unlock(&data->lock);
return IRQ_HANDLED;
}
@@ -392,7 +393,7 @@ static bool __sysmmu_disable(struct sysmmu_drvdata *data)
bool disabled;
unsigned long flags;
- write_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
disabled = set_sysmmu_inactive(data);
@@ -409,7 +410,7 @@ static bool __sysmmu_disable(struct sysmmu_drvdata *data)
data->activations);
}
- write_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
return disabled;
}
@@ -457,7 +458,7 @@ static int __sysmmu_enable(struct sysmmu_drvdata *data,
int ret = 0;
unsigned long flags;
- write_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (set_sysmmu_active(data)) {
data->pgtable = pgtable;
data->domain = domain;
@@ -475,7 +476,7 @@ static int __sysmmu_enable(struct sysmmu_drvdata *data,
if (WARN_ON(ret < 0))
set_sysmmu_inactive(data); /* decrement count */
- write_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
return ret;
}
@@ -562,7 +563,7 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova,
for_each_sysmmu_list(dev, list) {
struct sysmmu_drvdata *data = dev_get_drvdata(list->sysmmu);
- read_lock(&data->lock);
+ spin_lock(&data->lock);
if (is_sysmmu_active(data) && data->runtime_active) {
unsigned int num_inv = 1;
@@ -594,7 +595,7 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova,
iova);
}
- read_unlock(&data->lock);
+ spin_unlock(&data->lock);
}
spin_unlock_irqrestore(&owner->lock, flags);
@@ -610,7 +611,7 @@ void exynos_sysmmu_tlb_invalidate(struct device *dev)
for_each_sysmmu_list(dev, list) {
struct sysmmu_drvdata *data = dev_get_drvdata(list->sysmmu);
- read_lock(&data->lock);
+ spin_lock(&data->lock);
if (is_sysmmu_active(data) && data->runtime_active) {
__master_clk_enable(data);
if (sysmmu_block(data->sfrbase)) {
@@ -621,7 +622,7 @@ void exynos_sysmmu_tlb_invalidate(struct device *dev)
} else {
dev_dbg(dev, "disabled. Skipping TLB invalidation\n");
}
- read_unlock(&data->lock);
+ spin_unlock(&data->lock);
}
spin_unlock_irqrestore(&owner->lock, flags);
@@ -819,7 +820,7 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
if (!ret) {
data->runtime_active = !pm_runtime_enabled(dev);
data->sysmmu = dev;
- rwlock_init(&data->lock);
+ spin_lock_init(&data->lock);
platform_set_drvdata(pdev, data);
}
@@ -1269,12 +1270,12 @@ static int sysmmu_pm_genpd_suspend(struct device *dev)
for_each_sysmmu_list(dev, list) {
struct sysmmu_drvdata *data = dev_get_drvdata(list->sysmmu);
unsigned long flags;
- write_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (!data->suspended && is_sysmmu_active(data) &&
(!pm_runtime_enabled(dev) || data->runtime_active))
__sysmmu_disable_nocount(data);
data->suspended = true;
- write_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
}
return 0;
@@ -1288,12 +1289,12 @@ static int sysmmu_pm_genpd_resume(struct device *dev)
for_each_sysmmu_list(dev, list) {
struct sysmmu_drvdata *data = dev_get_drvdata(list->sysmmu);
unsigned long flags;
- write_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (data->suspended && is_sysmmu_active(data) &&
(!pm_runtime_enabled(dev) || data->runtime_active))
__sysmmu_enable_nocount(data);
data->suspended = false;
- write_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
}
return pm_generic_resume(dev);
@@ -1448,12 +1449,12 @@ static int sysmmu_hook_driver_register(struct notifier_block *nb,
dev_get_drvdata(list->sysmmu);
unsigned long flags;
- write_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (is_sysmmu_active(data) && !data->runtime_active)
__sysmmu_enable_nocount(data);
data->runtime_active = true;
pm_runtime_disable(data->sysmmu);
- write_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
}
break;
--
1.7.9.5
--
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