linux/drivers/iommu/omap-iommu-debug.c
Suman Anna 9c83e9f384 iommu/omap: Switch pagetable debugfs entry to use seq_file
The debugfs entry 'pagetable' that shows the page table entry
(PTE) data currently outputs only data that can be fit into a
page. Switch the entry to use the seq_file interface so that
it can show all the valid page table entries.

The patch also corrected the output for L2 entries, and prints
the proper L2 PTE instead of the previous L1 page descriptor
pointer.

Signed-off-by: Suman Anna <s-anna@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2014-10-23 14:33:48 +02:00

219 lines
4.7 KiB
C

/*
* 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);
}