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>

diff --git a/arch/arm/mach-msm/iommu.c b/arch/arm/mach-msm/iommu.c
index a468ee309d653a69b411e73bef9b336a6d344929..f65101742a742118985b843f4a0fe7dcba90d629 100644 (file)
--- a/arch/arm/mach-msm/iommu.c
+++ b/arch/arm/mach-msm/iommu.c
@@ -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);