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Date: Mon, 07 Oct 2013 10:57:42 +0900
From: Cho KyongHo <pullip.cho@...sung.com>
To: Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>,
Linux DeviceTree <devicetree@...r.kernel.org>,
Linux IOMMU <iommu@...ts.linux-foundation.org>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>
Cc: Antonios Motakis <a.motakis@...tualopensystems.com>,
Grant Grundler <grundler@...omium.org>,
Joerg Roedel <joro@...tes.org>,
Kukjin Kim <kgene.kim@...sung.com>,
Prathyush <prathyush.k@...sung.com>,
Rahul Sharma <rahul.sharma@...sung.com>,
Sachin Kamat <sachin.kamat@...aro.org>,
Subash Patel <supash.ramaswamy@...aro.org>,
Varun Sethi <Varun.Sethi@...escale.com>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Tomasz Figa <t.figa@...sung.com>
Subject: [PATCH v10 14/20] iommu/exynos: remove custom fault handler
This commit removes custom fault handler. The device drivers that
need to register fault handler can register
with iommu_set_fault_handler().
CC: Grant Grundler <grundler@...omium.org>
Signed-off-by: Cho KyongHo <pullip.cho@...sung.com>
---
drivers/iommu/exynos-iommu.c | 80 ++++++++++++-----------------------------
1 files changed, 24 insertions(+), 56 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 75efdb81..976b88a 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,
@@ -182,7 +172,6 @@ struct sysmmu_drvdata {
int activations;
rwlock_t lock;
struct iommu_domain *domain;
- sysmmu_fault_handler_t fault_handler;
unsigned long pgtable;
};
@@ -267,34 +256,17 @@ static void __sysmmu_set_ptbase(void __iomem *sfrbase,
__sysmmu_tlb_invalidate(sfrbase);
}
-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);
@@ -303,12 +275,6 @@ static int default_fault_handler(enum exynos_sysmmu_inttype itype,
ent = page_entry(ent, fault_addr);
pr_err("\t Lv2 entry: 0x%lx\n", *ent);
}
-
- pr_err("Generating Kernel OOPS... because it is unrecoverable.\n");
-
- BUG();
-
- return 0;
}
static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
@@ -331,24 +297,28 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
else
addr = __raw_readl(data->sfrbase + fault_reg_offset[itype]);
- if (data->domain)
- 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->sfrbase + REG_PT_BASE_ADDR);
- ret = data->fault_handler(itype, base, addr);
+ if (itype == SYSMMU_FAULT_UNKNOWN) {
+ pr_err("%s: Fault is not occurred by System MMU '%s'!\n",
+ __func__, dev_name(data->sysmmu));
+ pr_err("%s: Please check if IRQ is correctly configured.\n",
+ __func__);
+ BUG();
+ } else {
+ unsigned long base =
+ __raw_readl(data->sfrbase + REG_PT_BASE_ADDR);
+ show_fault_information(dev_name(data->sysmmu),
+ itype, base, addr);
+ if (data->domain)
+ ret = report_iommu_fault(data->domain,
+ data->dev, addr, itype);
}
- if (!ret && (itype != SYSMMU_FAULT_UNKNOWN))
- __raw_writel(1 << itype, data->sfrbase + REG_INT_CLEAR);
- else
- dev_dbg(data->sysmmu, "%s is not handled.\n",
- sysmmu_fault_name[itype]);
+ /* fault is not recovered by fault handler */
+ BUG_ON(ret != 0);
- if (itype != SYSMMU_FAULT_UNKNOWN)
- sysmmu_unblock(data->sfrbase);
+ __raw_writel(1 << itype, data->sfrbase + REG_INT_CLEAR);
+
+ sysmmu_unblock(data->sfrbase);
clk_disable(data->clk_master);
@@ -595,8 +565,6 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
rwlock_init(&data->lock);
INIT_LIST_HEAD(&data->node);
- __set_fault_handler(data, &default_fault_handler);
-
platform_set_drvdata(pdev, data);
pm_runtime_enable(dev);
--
1.7.2.5
--
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