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Diffstat (limited to 'drivers/iommu/omap-iommu-debug.c')
-rw-r--r--drivers/iommu/omap-iommu-debug.c218
1 files changed, 218 insertions, 0 deletions
diff --git a/drivers/iommu/omap-iommu-debug.c b/drivers/iommu/omap-iommu-debug.c
new file mode 100644
index 000000000..f3d20a203
--- /dev/null
+++ b/drivers/iommu/omap-iommu-debug.c
@@ -0,0 +1,218 @@
+/*
+ * omap iommu: debugfs interface
+ *
+ * Copyright (C) 2008-2009 Nokia Corporation
+ *
+ * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/debugfs.h>
+#include <linux/platform_data/iommu-omap.h>
+
+#include "omap-iopgtable.h"
+#include "omap-iommu.h"
+
+static DEFINE_MUTEX(iommu_debug_lock);
+
+static struct dentry *iommu_debug_root;
+
+static inline bool is_omap_iommu_detached(struct omap_iommu *obj)
+{
+ return !obj->domain;
+}
+
+static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct omap_iommu *obj = file->private_data;
+ char *p, *buf;
+ ssize_t bytes;
+
+ if (is_omap_iommu_detached(obj))
+ return -EPERM;
+
+ buf = kmalloc(count, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ p = buf;
+
+ mutex_lock(&iommu_debug_lock);
+
+ bytes = omap_iommu_dump_ctx(obj, p, count);
+ bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);
+
+ mutex_unlock(&iommu_debug_lock);
+ kfree(buf);
+
+ return bytes;
+}
+
+static ssize_t debug_read_tlb(struct file *file, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct omap_iommu *obj = file->private_data;
+ char *p, *buf;
+ ssize_t bytes, rest;
+
+ 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);
+
+ mutex_unlock(&iommu_debug_lock);
+ kfree(buf);
+
+ return bytes;
+}
+
+static void dump_ioptable(struct seq_file *s)
+{
+ int i, j;
+ u32 da;
+ u32 *iopgd, *iopte;
+ struct omap_iommu *obj = s->private;
+
+ spin_lock(&obj->page_table_lock);
+
+ iopgd = iopgd_offset(obj, 0);
+ for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {
+ if (!*iopgd)
+ continue;
+
+ if (!(*iopgd & IOPGD_TABLE)) {
+ da = i << IOPGD_SHIFT;
+ seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd);
+ continue;
+ }
+
+ iopte = iopte_offset(iopgd, 0);
+ for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) {
+ if (!*iopte)
+ continue;
+
+ da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT);
+ seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte);
+ }
+ }
+
+ spin_unlock(&obj->page_table_lock);
+}
+
+static int debug_read_pagetable(struct seq_file *s, void *data)
+{
+ struct omap_iommu *obj = s->private;
+
+ if (is_omap_iommu_detached(obj))
+ return -EPERM;
+
+ mutex_lock(&iommu_debug_lock);
+
+ seq_printf(s, "L: %8s %8s\n", "da:", "pte:");
+ seq_puts(s, "--------------------------\n");
+ dump_ioptable(s);
+
+ mutex_unlock(&iommu_debug_lock);
+
+ return 0;
+}
+
+#define DEBUG_SEQ_FOPS_RO(name) \
+ static int debug_open_##name(struct inode *inode, struct file *file) \
+ { \
+ return single_open(file, debug_read_##name, inode->i_private); \
+ } \
+ \
+ static const struct file_operations debug_##name##_fops = { \
+ .open = debug_open_##name, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .release = single_release, \
+ }
+
+#define DEBUG_FOPS_RO(name) \
+ static const struct file_operations debug_##name##_fops = { \
+ .open = simple_open, \
+ .read = debug_read_##name, \
+ .llseek = generic_file_llseek, \
+ };
+
+DEBUG_FOPS_RO(regs);
+DEBUG_FOPS_RO(tlb);
+DEBUG_SEQ_FOPS_RO(pagetable);
+
+#define __DEBUG_ADD_FILE(attr, mode) \
+ { \
+ struct dentry *dent; \
+ dent = debugfs_create_file(#attr, mode, obj->debug_dir, \
+ obj, &debug_##attr##_fops); \
+ if (!dent) \
+ goto err; \
+ }
+
+#define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400)
+
+void omap_iommu_debugfs_add(struct omap_iommu *obj)
+{
+ struct dentry *d;
+
+ if (!iommu_debug_root)
+ return;
+
+ obj->debug_dir = debugfs_create_dir(obj->name, iommu_debug_root);
+ if (!obj->debug_dir)
+ return;
+
+ d = debugfs_create_u8("nr_tlb_entries", 0400, obj->debug_dir,
+ (u8 *)&obj->nr_tlb_entries);
+ if (!d)
+ return;
+
+ DEBUG_ADD_FILE_RO(regs);
+ DEBUG_ADD_FILE_RO(tlb);
+ DEBUG_ADD_FILE_RO(pagetable);
+
+ return;
+
+err:
+ debugfs_remove_recursive(obj->debug_dir);
+}
+
+void omap_iommu_debugfs_remove(struct omap_iommu *obj)
+{
+ if (!obj->debug_dir)
+ return;
+
+ debugfs_remove_recursive(obj->debug_dir);
+}
+
+void __init omap_iommu_debugfs_init(void)
+{
+ iommu_debug_root = debugfs_create_dir("omap_iommu", NULL);
+ if (!iommu_debug_root)
+ pr_err("can't create debugfs dir\n");
+}
+
+void __exit omap_iommu_debugfs_exit(void)
+{
+ debugfs_remove(iommu_debug_root);
+}