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/*
* 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;
}
#define dump_ioptable_entry_one(lv, da, val) \
({ \
int __err = 0; \
ssize_t bytes; \
const int maxcol = 22; \
const char *str = "%d: %08x %08x\n"; \
bytes = snprintf(p, maxcol, str, lv, da, val); \
p += bytes; \
len -= bytes; \
if (len < maxcol) \
__err = -ENOMEM; \
__err; \
})
static ssize_t dump_ioptable(struct omap_iommu *obj, char *buf, ssize_t len)
{
int i;
u32 *iopgd;
char *p = buf;
spin_lock(&obj->page_table_lock);
iopgd = iopgd_offset(obj, 0);
for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {
int j, err;
u32 *iopte;
u32 da;
if (!*iopgd)
continue;
if (!(*iopgd & IOPGD_TABLE)) {
da = i << IOPGD_SHIFT;
err = dump_ioptable_entry_one(1, da, *iopgd);
if (err)
goto out;
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);
err = dump_ioptable_entry_one(2, da, *iopgd);
if (err)
goto out;
}
}
out:
spin_unlock(&obj->page_table_lock);
return p - buf;
}
static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct omap_iommu *obj = file->private_data;
char *p, *buf;
size_t bytes;
if (is_omap_iommu_detached(obj))
return -EPERM;
buf = (char *)__get_free_page(GFP_KERNEL);
if (!buf)
return -ENOMEM;
p = buf;
p += sprintf(p, "L: %8s %8s\n", "da:", "pa:");
p += sprintf(p, "-----------------------------------------\n");
mutex_lock(&iommu_debug_lock);
bytes = PAGE_SIZE - (p - buf);
p += dump_ioptable(obj, p, bytes);
bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
mutex_unlock(&iommu_debug_lock);
free_page((unsigned long)buf);
return bytes;
}
#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_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);
}
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