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Message-id: <002d01ce797b$49c441a0$dd4cc4e0$@samsung.com>
Date: Fri, 05 Jul 2013 21:29:26 +0900
From: Cho KyongHo <pullip.cho@...sung.com>
To: 'Linux ARM Kernel' <linux-arm-kernel@...ts.infradead.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: 'Hyunwoong Kim' <khw0178.kim@...sung.com>,
'Joerg Roedel' <joro@...tes.org>,
'Kukjin Kim' <kgene.kim@...sung.com>,
'Prathyush' <prathyush.k@...sung.com>,
'Rahul Sharma' <rahul.sharma@...sung.com>,
'Subash Patel' <supash.ramaswamy@...aro.org>,
'Keyyoung Park' <keyyoung.park@...sung.com>,
'Grant Grundler' <grundler@...omium.org>
Subject: [PATCH v7 5/9] 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.
Signed-off-by: Cho KyongHo <pullip.cho@...sung.com>
---
drivers/iommu/exynos-iommu.c | 32 ++++++++++++++++----------------
1 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 390f8b7..6793661 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -175,7 +175,7 @@ struct sysmmu_drvdata {
void __iomem **sfrbases;
struct clk *clk[2];
int activations;
- rwlock_t lock;
+ spinlock_t lock;
struct iommu_domain *domain;
sysmmu_fault_handler_t fault_handler;
unsigned long pgtable;
@@ -259,7 +259,7 @@ void exynos_sysmmu_set_prefbuf(struct device *dev,
BUG_ON((base0 + size0) <= base0);
BUG_ON((size1 > 0) && ((base1 + size1) <= base1));
- read_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (!is_sysmmu_active(data))
goto finish;
@@ -289,7 +289,7 @@ void exynos_sysmmu_set_prefbuf(struct device *dev,
}
}
finish:
- read_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
}
static void __set_fault_handler(struct sysmmu_drvdata *data,
@@ -297,9 +297,9 @@ static void __set_fault_handler(struct sysmmu_drvdata *data,
{
unsigned long flags;
- write_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
data->fault_handler = handler;
- write_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
}
void exynos_sysmmu_set_fault_handler(struct device *dev,
@@ -347,7 +347,7 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
int i, ret = -ENOSYS;
- read_lock(&data->lock);
+ spin_lock(&data->lock);
WARN_ON(!is_sysmmu_active(data));
@@ -391,7 +391,7 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
if (itype != SYSMMU_FAULT_UNKNOWN)
sysmmu_unblock(data->sfrbases[i]);
- read_unlock(&data->lock);
+ spin_unlock(&data->lock);
return IRQ_HANDLED;
}
@@ -402,7 +402,7 @@ static bool __exynos_sysmmu_disable(struct sysmmu_drvdata *data)
bool disabled = false;
int i;
- write_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (!set_sysmmu_inactive(data))
goto finish;
@@ -419,7 +419,7 @@ static bool __exynos_sysmmu_disable(struct sysmmu_drvdata *data)
data->pgtable = 0;
data->domain = NULL;
finish:
- write_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
if (disabled)
dev_dbg(data->sysmmu, "(%s) Disabled\n", data->dbgname);
@@ -442,7 +442,7 @@ static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data,
int i, ret = 0;
unsigned long flags;
- write_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (!set_sysmmu_active(data)) {
if (WARN_ON(pgtable != data->pgtable)) {
@@ -481,7 +481,7 @@ static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data,
dev_dbg(data->sysmmu, "(%s) Enabled\n", data->dbgname);
finish:
- write_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
return ret;
}
@@ -528,7 +528,7 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova)
unsigned long flags;
struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
- read_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (is_sysmmu_active(data)) {
int i;
@@ -545,7 +545,7 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova)
data->dbgname);
}
- read_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
}
void exynos_sysmmu_tlb_invalidate(struct device *dev)
@@ -553,7 +553,7 @@ void exynos_sysmmu_tlb_invalidate(struct device *dev)
unsigned long flags;
struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
- read_lock_irqsave(&data->lock, flags);
+ spin_lock_irqsave(&data->lock, flags);
if (is_sysmmu_active(data)) {
int i;
@@ -569,7 +569,7 @@ void exynos_sysmmu_tlb_invalidate(struct device *dev)
data->dbgname);
}
- read_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
}
static int exynos_sysmmu_probe(struct platform_device *pdev)
@@ -666,7 +666,7 @@ static int exynos_sysmmu_probe(struct platform_device *pdev)
}
data->sysmmu = dev;
- rwlock_init(&data->lock);
+ spin_lock_init(&data->lock);
INIT_LIST_HEAD(&data->node);
__set_fault_handler(data, &default_fault_handler);
--
1.7.2.5
--
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