Re: [PATCH v8 09/12] iommu/exynos: remove custom fault handler

[Grant Grundler]

On Fri, Jul 26, 2013 at 4:29 AM, Cho KyongHo <pullip.cho@xxxxxxxxxxx> wrote:
> This commit removes custom fault handler. The device drivers that
> need to register fault handler can register
> with iommu_set_fault_handler().
>
> Signed-off-by: Cho KyongHo <pullip.cho@xxxxxxxxxxx>


Reviewed-by: Grant Grundler <grundler@xxxxxxxxxxxx>

cheers
grant

> ---
>  drivers/iommu/exynos-iommu.c |   71 ++++++++++--------------------------------
>  1 files changed, 17 insertions(+), 54 deletions(-)
>
> diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> index 87f6bb7..f9853fe 100644
> --- a/drivers/iommu/exynos-iommu.c
> +++ b/drivers/iommu/exynos-iommu.c
> @@ -131,16 +131,6 @@ enum exynos_sysmmu_inttype {
>         SYSMMU_FAULTS_NUM
>  };
>
> -/*
> - * @itype: type of fault.
> - * @pgtable_base: the physical address of page table base. This is 0 if @itype
> - *                is SYSMMU_BUSERROR.
> - * @fault_addr: the device (virtual) address that the System MMU tried to
> - *             translated. This is 0 if @itype is SYSMMU_BUSERROR.
> - */
> -typedef int (*sysmmu_fault_handler_t)(enum exynos_sysmmu_inttype itype,
> -                       unsigned long pgtable_base, unsigned long fault_addr);
> -
>  static unsigned short fault_reg_offset[SYSMMU_FAULTS_NUM] = {
>         REG_PAGE_FAULT_ADDR,
>         REG_AR_FAULT_ADDR,
> @@ -181,7 +171,6 @@ struct sysmmu_drvdata {
>         int activations;
>         rwlock_t lock;
>         struct iommu_domain *domain;
> -       sysmmu_fault_handler_t fault_handler;
>         unsigned long pgtable;
>         void __iomem *sfrbases[0];
>  };
> @@ -313,34 +302,17 @@ finish:
>         read_unlock_irqrestore(&data->lock, flags);
>  }
>
> -static void __set_fault_handler(struct sysmmu_drvdata *data,
> -                                       sysmmu_fault_handler_t handler)
> -{
> -       unsigned long flags;
> -
> -       write_lock_irqsave(&data->lock, flags);
> -       data->fault_handler = handler;
> -       write_unlock_irqrestore(&data->lock, flags);
> -}
> -
> -void exynos_sysmmu_set_fault_handler(struct device *dev,
> -                                       sysmmu_fault_handler_t handler)
> -{
> -       struct sysmmu_drvdata *data = dev_get_drvdata(dev->archdata.iommu);
> -
> -       __set_fault_handler(data, handler);
> -}
> -
> -static int default_fault_handler(enum exynos_sysmmu_inttype itype,
> -                    unsigned long pgtable_base, unsigned long fault_addr)
> +static void show_fault_information(const char *name,
> +               enum exynos_sysmmu_inttype itype,
> +               unsigned long pgtable_base, unsigned long fault_addr)
>  {
>         unsigned long *ent;
>
>         if ((itype >= SYSMMU_FAULTS_NUM) || (itype < SYSMMU_PAGEFAULT))
>                 itype = SYSMMU_FAULT_UNKNOWN;
>
> -       pr_err("%s occurred at 0x%lx(Page table base: 0x%lx)\n",
> -                       sysmmu_fault_name[itype], fault_addr, pgtable_base);
> +       pr_err("%s occurred at 0x%lx by %s(Page table base: 0x%lx)\n",
> +               sysmmu_fault_name[itype], fault_addr, name, pgtable_base);
>
>         ent = section_entry(__va(pgtable_base), fault_addr);
>         pr_err("\tLv1 entry: 0x%lx\n", *ent);
> @@ -353,16 +325,12 @@ static int default_fault_handler(enum exynos_sysmmu_inttype itype,
>         pr_err("Generating Kernel OOPS... because it is unrecoverable.\n");
>
>         BUG();
> -
> -       return 0;
>  }
>
>  static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
>  {
>         /* SYSMMU is in blocked when interrupt occurred. */
>         struct sysmmu_drvdata *data = dev_id;
> -       struct resource *irqres;
> -       struct platform_device *pdev;
>         enum exynos_sysmmu_inttype itype;
>         unsigned long addr = -1;
>
> @@ -372,14 +340,15 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
>
>         WARN_ON(!is_sysmmu_active(data));
>
> -       pdev = to_platform_device(data->sysmmu);
> -       for (i = 0; i < (pdev->num_resources / 2); i++) {
> -               irqres = platform_get_resource(pdev, IORESOURCE_IRQ, i);
> +       for (i = 0; i < data->nsfrs; i++) {
> +               struct resource *irqres;
> +               irqres = platform_get_resource(to_platform_device(data->sysmmu),
> +                                               IORESOURCE_IRQ, i);
>                 if (irqres && ((int)irqres->start == irq))
>                         break;
>         }
>
> -       if (i == pdev->num_resources) {
> +       if (i == data->nsfrs) {
>                 itype = SYSMMU_FAULT_UNKNOWN;
>         } else {
>                 itype = (enum exynos_sysmmu_inttype)
> @@ -395,19 +364,15 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
>                 ret = report_iommu_fault(data->domain, data->dev,
>                                 addr, itype);
>
> -       if ((ret == -ENOSYS) && data->fault_handler) {
> -               unsigned long base = data->pgtable;
> -               if (itype != SYSMMU_FAULT_UNKNOWN)
> -                       base = __raw_readl(
> -                                       data->sfrbases[i] + REG_PT_BASE_ADDR);
> -               ret = data->fault_handler(itype, base, addr);
> -       }
> -
>         if (!ret && (itype != SYSMMU_FAULT_UNKNOWN))
>                 __raw_writel(1 << itype, data->sfrbases[i] + REG_INT_CLEAR);
> -       else
> -               dev_dbg(data->sysmmu, "%s is not handled.\n",
> -                               sysmmu_fault_name[itype]);
> +       else {
> +               unsigned long ba = data->pgtable;
> +               if (itype != SYSMMU_FAULT_UNKNOWN)
> +                       ba = __raw_readl(data->sfrbases[i] + REG_PT_BASE_ADDR);
> +               show_fault_information(dev_name(data->sysmmu),
> +                                       itype, ba, addr);
> +       }
>
>         if (itype != SYSMMU_FAULT_UNKNOWN)
>                 sysmmu_unblock(data->sfrbases[i]);
> @@ -644,8 +609,6 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
>
>         pm_runtime_enable(dev);
>
> -       __set_fault_handler(data, &default_fault_handler);
> -
>         data->sysmmu = dev;
>         data->clk = devm_clk_get(dev, "sysmmu");
>         if (IS_ERR(data->clk)) {
> --
> 1.7.2.5
>
>
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