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Message-id: <002501cdc6f0$f81ca550$e855eff0$%cho@samsung.com>
Date: Tue, 20 Nov 2012 16:30:51 +0900
From: Cho KyongHo <pullip.cho@...sung.com>
To: linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Cc: 'Joerg Roedel' <joro@...tes.org>,
'Sanghyun Lee' <sanghyun75.lee@...sung.com>,
'Kukjin Kim' <kgene.kim@...sung.com>,
'Subash Patel' <subash.ramaswamy@...aro.org>,
prathyush.k@...sung.com, rahul.sharma@...sung.com,
sw0312.kim@...sung.com
Subject: [PATCH v2 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 | 100 ++++++++++++++++++++++++++++++++-----------
1 file changed, 76 insertions(+), 24 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 77833f5..128c811 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>
@@ -150,15 +151,21 @@ enum exynos_sysmmu_inttype {
SYSMMU_FAULTS_NUM
};
-/*
+/**
+ * fault handler function type
+ * @dev: the client device
+ * @mmuname: name of the System MMU that generates fault
* @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);
+typedef int (*sysmmu_fault_handler_t)(struct device *dev,
+ const char *mmuname,
+ 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,
@@ -234,6 +241,7 @@ struct sysmmu_drvdata {
sysmmu_fault_handler_t fault_handler;
unsigned long pgtable;
bool runtime_active;
+ const char **mmuname;
void __iomem *sfrbases[0];
};
@@ -612,16 +620,18 @@ void exynos_sysmmu_set_fault_handler(struct device *dev,
spin_unlock_irqrestore(&owner->lock, flags);
}
-static int default_fault_handler(enum exynos_sysmmu_inttype itype,
- unsigned long pgtable_base, unsigned long fault_addr)
+static int default_fault_handler(struct device *dev, const char *mmuname,
+ 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);
+ dev_err(dev, "%s occured at 0x%lx by '%s'(Page table base: 0x%lx)\n",
+ sysmmu_fault_name[itype], fault_addr, mmuname, pgtable_base);
ent = section_entry(__va(pgtable_base), fault_addr);
pr_err("\tLv1 entry: 0x%lx\n", *ent);
@@ -642,25 +652,30 @@ 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;
unsigned long addr = -1;
-
+ const char *mmuname = NULL;
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 = SYSMMU_FAULT_UNKNOWN;
} else {
itype = (enum exynos_sysmmu_inttype)
@@ -672,28 +687,34 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id)
data->sfrbases[i] + fault_reg_offset[itype]);
}
- if (data->domain)
- ret = report_iommu_fault(data->domain, data->master,
+ if (data->domain) /* owner is always set if data->domain exists */
+ ret = report_iommu_fault(data->domain, owner->dev,
addr, itype);
if ((ret == -ENOSYS) && data->fault_handler) {
unsigned long base = data->pgtable;
+ mmuname = (data->mmuname) ? data->mmuname[i]
+ : dev_name(data->sysmmu);
+
if (itype != SYSMMU_FAULT_UNKNOWN)
base = __raw_readl(
data->sfrbases[i] + REG_PT_BASE_ADDR);
- ret = data->fault_handler(itype, base, addr);
+ ret = data->fault_handler(owner ? owner->dev : data->sysmmu,
+ mmuname, 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]);
+ dev_dbg(owner ? owner->dev : data->sysmmu,
+ "%s is not handled by %s\n",
+ sysmmu_fault_name[itype],
+ dev_name(data->sysmmu));
- if (itype != SYSMMU_FAULT_UNKNOWN)
- sysmmu_unblock(data->sfrbases[i]);
+ sysmmu_unblock(data->sfrbases[i]);
- spin_unlock(&data->lock);
+ if (owner)
+ spin_unlock(&owner->lock);
return IRQ_HANDLED;
}
@@ -1049,6 +1070,30 @@ 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;
@@ -1060,9 +1105,14 @@ 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");
@@ -1112,6 +1162,8 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
ret = __sysmmu_setup(dev, data);
if (!ret) {
+ __sysmmu_init_mmuname(dev, data);
+
data->runtime_active = !pm_runtime_enabled(dev);
data->sysmmu = dev;
spin_lock_init(&data->lock);
--
1.8.0
--
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