[PATCH v4 11/12] iommu/exynos: add literal name of System MMU fordebugging

[Cho KyongHo]

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@xxxxxxxxxxx>
---
 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 985d317..4981afe 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];
 };
 
@@ -611,16 +619,18 @@ 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);
@@ -641,25 +651,30 @@ 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)
@@ -671,28 +686,34 @@ 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;
 }
@@ -1050,6 +1071,30 @@ 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;
@@ -1061,9 +1106,14 @@ 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");
@@ -1107,6 +1157,8 @@ 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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