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Message-id: <002801cdc8a5$2d68bbd0$883a3370$%cho@samsung.com>
Date: Thu, 22 Nov 2012 20:33:21 +0900
From: Cho KyongHo <pullip.cho@...sung.com>
To: linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Cc: 'Joerg Roedel' <joro@...tes.org>,
'Sanghyun Lee' <sanghyun75.lee@...sung.com>,
'Kukjin Kim' <kgene.kim@...sung.com>, sw0312.kim@...sung.com,
'Subash Patel' <subash.ramaswamy@...aro.org>,
prathyush.k@...sung.com, rahul.sharma@...sung.com
Subject: [PATCH v4 07/12] 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: KyongHo Cho <pullip.cho@...sung.com>
---
drivers/iommu/exynos-iommu.c | 32 ++++++++++++++++----------------
1 file changed, 16 insertions(+), 16 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 0bb194e..e39ddac 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -184,7 +184,7 @@ struct sysmmu_drvdata {
struct clk *clk;
int activations;
struct sysmmu_version ver;
- rwlock_t lock;
+ spinlock_t lock;
struct iommu_domain *domain;
sysmmu_fault_handler_t fault_handler;
unsigned long pgtable;
@@ -288,7 +288,7 @@ 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;
@@ -318,7 +318,7 @@ 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,
@@ -326,9 +326,9 @@ 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,
@@ -376,7 +376,7 @@ 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));
@@ -420,7 +420,7 @@ 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;
}
@@ -431,7 +431,7 @@ 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;
@@ -446,7 +446,7 @@ 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, "Disabled\n");
@@ -469,7 +469,7 @@ 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)) {
@@ -506,7 +506,7 @@ static int __exynos_sysmmu_enable(struct sysmmu_drvdata *data,
dev_dbg(data->sysmmu, "Enabled\n");
finish:
- write_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
return ret;
}
@@ -553,7 +553,7 @@ 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;
@@ -569,7 +569,7 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, unsigned long iova)
"Disabled. Skipping invalidating TLB.\n");
}
- read_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
}
void exynos_sysmmu_tlb_invalidate(struct device *dev)
@@ -577,7 +577,7 @@ 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;
@@ -592,7 +592,7 @@ void exynos_sysmmu_tlb_invalidate(struct device *dev)
"Disabled. Skipping invalidating TLB.\n");
}
- read_unlock_irqrestore(&data->lock, flags);
+ spin_unlock_irqrestore(&data->lock, flags);
}
static int __init __sysmmu_init_clock(struct device *sysmmu,
@@ -748,7 +748,7 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
ret = __sysmmu_setup(dev, data);
if (!ret) {
data->sysmmu = dev;
- rwlock_init(&data->lock);
+ spin_lock_init(&data->lock);
INIT_LIST_HEAD(&data->node);
__set_fault_handler(data, &default_fault_handler);
--
1.8.0
--
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