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Message-ID: <CANEJEGvcbUXMcb+4Qvu99ULJJEZ8GoHdkH4_nnayt1YzFEF-Jg@mail.gmail.com>
Date: Fri, 26 Jul 2013 10:22:13 -0700
From: Grant Grundler <grundler@...omium.org>
To: Cho KyongHo <pullip.cho@...sung.com>
Cc: 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>,
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>,
Antonios Motakis <a.motakis@...tualopensystems.com>,
kvmarm@...ts.cs.columbia.edu,
Sachin Kamat <sachin.kamat@...aro.org>
Subject: Re: [PATCH v8 09/12] iommu/exynos: remove custom fault handler
On Fri, Jul 26, 2013 at 4:29 AM, Cho KyongHo <pullip.cho@...sung.com> 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@...sung.com>
Reviewed-by: Grant Grundler <grundler@...omium.org>
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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