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msm: iommu: Miscellaneous code cleanup 

Remove some unneeded assignments and messages, restructure
a failure path in iova_to_phys, and make __flush_iotlb
return int in preparation for adding IOMMU clock control.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
This commit is contained in:
Stepan Moskovchenko 2010-11-12 19:30:00 -08:00 committed by Daniel Walker
parent 100832c9b6
commit 33069739d1
1 changed files with 17 additions and 12 deletions
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29
arch/arm/mach-msm/iommu.c
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@ -50,12 +50,12 @@ struct msm_priv {
struct list_head list_attached;
};
static void __flush_iotlb(struct iommu_domain *domain)
static int __flush_iotlb(struct iommu_domain *domain)
{
struct msm_priv *priv = domain->priv;
struct msm_iommu_drvdata *iommu_drvdata;
struct msm_iommu_ctx_drvdata *ctx_drvdata;
int ret = 0;
#ifndef CONFIG_IOMMU_PGTABLES_L2
unsigned long *fl_table = priv->pgtable;
int i;
@ -79,6 +79,8 @@ static void __flush_iotlb(struct iommu_domain *domain)
iommu_drvdata = dev_get_drvdata(ctx_drvdata->pdev->dev.parent);
SET_CTX_TLBIALL(iommu_drvdata->base, ctx_drvdata->num, 0);
}
return ret;
}
static void __reset_context(void __iomem *base, int ctx)
@ -267,7 +269,7 @@ static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
__pa(priv->pgtable));
list_add(&(ctx_drvdata->attached_elm), &priv->list_attached);
__flush_iotlb(domain);
ret = __flush_iotlb(domain);
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
@ -282,6 +284,7 @@ static void msm_iommu_detach_dev(struct iommu_domain *domain,
struct msm_iommu_drvdata *iommu_drvdata;
struct msm_iommu_ctx_drvdata *ctx_drvdata;
unsigned long flags;
int ret;
spin_lock_irqsave(&msm_iommu_lock, flags);
priv = domain->priv;
@ -296,7 +299,10 @@ static void msm_iommu_detach_dev(struct iommu_domain *domain,
if (!iommu_drvdata || !ctx_drvdata || !ctx_dev)
goto fail;
__flush_iotlb(domain);
ret = __flush_iotlb(domain);
if (ret)
goto fail;
__reset_context(iommu_drvdata->base, ctx_dev->num);
list_del_init(&ctx_drvdata->attached_elm);
@ -410,7 +416,7 @@ static int msm_iommu_map(struct iommu_domain *domain, unsigned long va,
SL_AP1 | SL_SHARED | SL_TYPE_LARGE | pgprot;
}
__flush_iotlb(domain);
ret = __flush_iotlb(domain);
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
return ret;
@ -495,7 +501,7 @@ static int msm_iommu_unmap(struct iommu_domain *domain, unsigned long va,
}
}
__flush_iotlb(domain);
ret = __flush_iotlb(domain);
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
return ret;
@ -530,9 +536,6 @@ static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain,
SET_CTX_TLBIALL(base, ctx, 0);
SET_V2PPR_VA(base, ctx, va >> V2Pxx_VA_SHIFT);
if (GET_FAULT(base, ctx))
goto fail;
par = GET_PAR(base, ctx);
/* We are dealing with a supersection */
@ -541,6 +544,9 @@ static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain,
else /* Upper 20 bits from PAR, lower 12 from VA */
ret = (par & 0xFFFFF000) | (va & 0x00000FFF);
if (GET_FAULT(base, ctx))
ret = 0;
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
return ret;
@ -583,8 +589,8 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
{
struct msm_iommu_drvdata *drvdata = dev_id;
void __iomem *base;
unsigned int fsr = 0;
int ncb = 0, i = 0;
unsigned int fsr;
int ncb, i;
spin_lock(&msm_iommu_lock);
@ -595,7 +601,6 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
base = drvdata->base;
pr_err("===== WOAH! =====\n");
pr_err("Unexpected IOMMU page fault!\n");
pr_err("base = %08x\n", (unsigned int) base);