1 files changed, 111 insertions, 20 deletions

diff --git a/drivers/iommu/omap-iommu-debug.c b/drivers/iommu/omap-iommu-debug.c
index f3d20a2039d2..0717aa96ce39 100644
--- a/drivers/iommu/omap-iommu-debug.c
+++ b/drivers/iommu/omap-iommu-debug.c
@@ -14,6 +14,7 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
+#include <linux/pm_runtime.h>
 #include <linux/debugfs.h>
 #include <linux/platform_data/iommu-omap.h>
 
@@ -29,6 +30,59 @@ static inline bool is_omap_iommu_detached(struct omap_iommu *obj)
 	return !obj->domain;
 }
 
+#define pr_reg(name)							\
+	do {								\
+		ssize_t bytes;						\
+		const char *str = "%20s: %08x\n";			\
+		const int maxcol = 32;					\
+		bytes = snprintf(p, maxcol, str, __stringify(name),	\
+				 iommu_read_reg(obj, MMU_##name));	\
+		p += bytes;						\
+		len -= bytes;						\
+		if (len < maxcol)					\
+			goto out;					\
+	} while (0)
+
+static ssize_t
+omap2_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len)
+{
+	char *p = buf;
+
+	pr_reg(REVISION);
+	pr_reg(IRQSTATUS);
+	pr_reg(IRQENABLE);
+	pr_reg(WALKING_ST);
+	pr_reg(CNTL);
+	pr_reg(FAULT_AD);
+	pr_reg(TTB);
+	pr_reg(LOCK);
+	pr_reg(LD_TLB);
+	pr_reg(CAM);
+	pr_reg(RAM);
+	pr_reg(GFLUSH);
+	pr_reg(FLUSH_ENTRY);
+	pr_reg(READ_CAM);
+	pr_reg(READ_RAM);
+	pr_reg(EMU_FAULT_AD);
+out:
+	return p - buf;
+}
+
+static ssize_t omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf,
+				   ssize_t bytes)
+{
+	if (!obj || !buf)
+		return -EINVAL;
+
+	pm_runtime_get_sync(obj->dev);
+
+	bytes = omap2_iommu_dump_ctx(obj, buf, bytes);
+
+	pm_runtime_put_sync(obj->dev);
+
+	return bytes;
+}
+
 static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
 			       size_t count, loff_t *ppos)
 {
@@ -55,34 +109,71 @@ static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
 	return bytes;
 }
 
-static ssize_t debug_read_tlb(struct file *file, char __user *userbuf,
-			      size_t count, loff_t *ppos)
+static int
+__dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
 {
-	struct omap_iommu *obj = file->private_data;
-	char *p, *buf;
-	ssize_t bytes, rest;
+	int i;
+	struct iotlb_lock saved;
+	struct cr_regs tmp;
+	struct cr_regs *p = crs;
+
+	pm_runtime_get_sync(obj->dev);
+	iotlb_lock_get(obj, &saved);
+
+	for_each_iotlb_cr(obj, num, i, tmp) {
+		if (!iotlb_cr_valid(&tmp))
+			continue;
+		*p++ = tmp;
+	}
+
+	iotlb_lock_set(obj, &saved);
+	pm_runtime_put_sync(obj->dev);
+
+	return  p - crs;
+}
+
+static ssize_t iotlb_dump_cr(struct omap_iommu *obj, struct cr_regs *cr,
+			     struct seq_file *s)
+{
+	return seq_printf(s, "%08x %08x %01x\n", cr->cam, cr->ram,
+			  (cr->cam & MMU_CAM_P) ? 1 : 0);
+}
+
+static size_t omap_dump_tlb_entries(struct omap_iommu *obj, struct seq_file *s)
+{
+	int i, num;
+	struct cr_regs *cr;
+
+	num = obj->nr_tlb_entries;
+
+	cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
+	if (!cr)
+		return 0;
+
+	num = __dump_tlb_entries(obj, cr, num);
+	for (i = 0; i < num; i++)
+		iotlb_dump_cr(obj, cr + i, s);
+	kfree(cr);
+
+	return 0;
+}
+
+static int debug_read_tlb(struct seq_file *s, void *data)
+{
+	struct omap_iommu *obj = s->private;
 
 	if (is_omap_iommu_detached(obj))
 		return -EPERM;
 
-	buf = kmalloc(count, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-	p = buf;
-
 	mutex_lock(&iommu_debug_lock);
 
-	p += sprintf(p, "%8s %8s\n", "cam:", "ram:");
-	p += sprintf(p, "-----------------------------------------\n");
-	rest = count - (p - buf);
-	p += omap_dump_tlb_entries(obj, p, rest);
-
-	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
+	seq_printf(s, "%8s %8s\n", "cam:", "ram:");
+	seq_puts(s, "-----------------------------------------\n");
+	omap_dump_tlb_entries(obj, s);
 
 	mutex_unlock(&iommu_debug_lock);
-	kfree(buf);
 
-	return bytes;
+	return 0;
 }
 
 static void dump_ioptable(struct seq_file *s)
@@ -154,10 +245,10 @@ static int debug_read_pagetable(struct seq_file *s, void *data)
 		.open = simple_open,					\
 		.read = debug_read_##name,				\
 		.llseek = generic_file_llseek,				\
-	};
+	}
 
 DEBUG_FOPS_RO(regs);
-DEBUG_FOPS_RO(tlb);
+DEBUG_SEQ_FOPS_RO(tlb);
 DEBUG_SEQ_FOPS_RO(pagetable);
 
 #define __DEBUG_ADD_FILE(attr, mode)					\