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Message-id: <003e01cde30b$ef82bb00$ce883100$%cho@samsung.com>
Date: Wed, 26 Dec 2012 10:54:26 +0900
From: Cho KyongHo <pullip.cho@...sung.com>
To: '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>
Cc: '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>
Subject: [PATCH v6 11/12] iommu/exynos: add literal name of System MMU for
debugging
This commit adds System MMU name to the driver data of each System
MMU. It is used by fault information.
Signed-off-by: KyongHo Cho <pullip.cho@...sung.com>
---
drivers/iommu/exynos-iommu.c | 72 ++++++++++++++++++++++++++++++++++++--------
1 file changed, 59 insertions(+), 13 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 70921e9..9753e0e 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -26,6 +26,7 @@
#include <linux/list.h>
#include <linux/memblock.h>
#include <linux/export.h>
+#include <linux/string.h>
#include <linux/of.h>
#include <linux/of_platform.h>
@@ -180,6 +181,7 @@ struct exynos_iommu_domain {
short *lv2entcnt; /* free lv2 entry counter for each section */
spinlock_t lock; /* lock for this structure */
spinlock_t pgtablelock; /* lock for modifying page table @ pgtable */
+ const char *fault_info; /* debugging information for fault */
};
/* exynos_iommu_owner
@@ -224,6 +226,7 @@ struct sysmmu_drvdata {
struct iommu_domain *domain;
unsigned long pgtable;
bool runtime_active;
+ const char **mmuname;
void __iomem *sfrbases[0];
};
@@ -601,25 +604,29 @@ 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;
+ struct exynos_iommu_owner *owner = NULL;
enum exynos_sysmmu_inttype itype = SYSMMU_FAULT_UNKNOWN;
unsigned long addr = -1;
-
int i, ret = -ENOSYS;
- spin_lock(&data->lock);
+ if (data->master)
+ owner = data->master->archdata.iommu;
+
+ if (owner)
+ spin_lock(&owner->lock);
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 = (enum exynos_sysmmu_inttype)
__ffs(__raw_readl(data->sfrbases[i] + REG_INT_STATUS));
if (WARN_ON(!((itype >= 0) && (itype < SYSMMU_FAULT_UNKNOWN))))
@@ -629,11 +636,17 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
data->sfrbases[i] + fault_reg_offset[itype]);
}
- if (data->domain)
+ if ((itype >= SYSMMU_FAULTS_NUM) || (itype < SYSMMU_PAGEFAULT))
+ itype = SYSMMU_FAULT_UNKNOWN;
+
+ if (data->domain) {
+ struct exynos_iommu_domain *priv = data->domain->priv;
+ priv->fault_info = data->mmuname[i];
ret = report_iommu_fault(data->domain,
data->master, addr, itype);
- else
+ } else {
__show_fault_information(__va(data->pgtable), itype, addr);
+ }
if (ret == -ENOSYS)
pr_err("NO SYSTEM MMU FAULT HANDLER REGISTERED FOR %s\n",
@@ -651,7 +664,8 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
sysmmu_unblock(data->sfrbases[i]);
- spin_unlock(&data->lock);
+ if (owner)
+ spin_unlock(&owner->lock);
return IRQ_HANDLED;
}
@@ -1028,6 +1042,30 @@ err_dev_put:
return ret;
}
+static void __init __sysmmu_init_mmuname(struct device *sysmmu,
+ struct sysmmu_drvdata *drvdata)
+{
+ int i;
+ const char *mmuname;
+
+ if (of_property_count_strings(sysmmu->of_node, "mmuname") !=
+ drvdata->nsfrs)
+ return;
+
+ drvdata->mmuname = (void *)drvdata->sfrbases +
+ sizeof(drvdata->sfrbases[0]) * drvdata->nsfrs;
+
+ for (i = 0; i < drvdata->nsfrs; i++) {
+ if (of_property_read_string_index(sysmmu->of_node,
+ "mmuname", i, &mmuname))
+ dev_err(sysmmu, "Failed read mmuname[%d]\n", i);
+ else
+ drvdata->mmuname[i] = kstrdup(mmuname, GFP_KERNEL);
+ if (!drvdata->mmuname[i])
+ drvdata->mmuname[i] = "noname";
+ }
+}
+
static int __init exynos_sysmmu_probe(struct platform_device *pdev)
{
int i, ret;
@@ -1039,9 +1077,14 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
return -ENODEV;
}
+ ret = of_property_count_strings(pdev->dev.of_node, "mmuname");
+ if (ret != (int)(pdev->num_resources / 2))
+ ret = 0;
+
data = devm_kzalloc(dev,
sizeof(*data)
- + sizeof(*data->sfrbases) * (pdev->num_resources / 2),
+ + sizeof(*data->sfrbases) * (pdev->num_resources / 2)
+ + sizeof(*data->mmuname) * ret,
GFP_KERNEL);
if (!data) {
dev_err(dev, "Not enough memory\n");
@@ -1084,6 +1127,8 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
ret = __sysmmu_setup(dev, data);
if (!ret) {
+ __sysmmu_init_mmuname(dev, data);
+
data->sysmmu = dev;
spin_lock_init(&data->lock);
@@ -1211,7 +1256,8 @@ static int exynos_iommu_fault_handler(struct iommu_domain *domain,
{
struct exynos_iommu_domain *priv = domain->priv;
- dev_err(dev, "System MMU Generated FAULT!\n\n");
+ dev_err(dev, "System MMU '%s' Generated FAULT!\n\n",
+ priv->fault_info ? priv->fault_info : "");
__show_fault_information(priv->pgtable, iova, flags);
return -ENOSYS;
--
1.8.0
--
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