mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 18:30:06 +00:00
![Joe Perches](/assets/img/avatar_default.png)
The seq_<foo> function return values were frequently misused.
See: commit 1f33c41c03
("seq_file: Rename seq_overflow() to
seq_has_overflowed() and make public")
All uses of these return values have been removed, so convert the
return types to void.
Miscellanea:
o Move seq_put_decimal_<type> and seq_escape prototypes closer the
other seq_vprintf prototypes
o Reorder seq_putc and seq_puts to return early on overflow
o Add argument names to seq_vprintf and seq_printf
o Update the seq_escape kernel-doc
o Convert a couple of leading spaces to tabs in seq_escape
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
310 lines
6.4 KiB
C
310 lines
6.4 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/pm_runtime.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;
|
|
}
|
|
|
|
#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)
|
|
{
|
|
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 int
|
|
__dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
|
|
{
|
|
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)
|
|
{
|
|
seq_printf(s, "%08x %08x %01x\n", cr->cam, cr->ram,
|
|
(cr->cam & MMU_CAM_P) ? 1 : 0);
|
|
return 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;
|
|
|
|
mutex_lock(&iommu_debug_lock);
|
|
|
|
seq_printf(s, "%8s %8s\n", "cam:", "ram:");
|
|
seq_puts(s, "-----------------------------------------\n");
|
|
omap_dump_tlb_entries(obj, s);
|
|
|
|
mutex_unlock(&iommu_debug_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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_SEQ_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);
|
|
}
|