Commit 14e0e679 authored by Hiroshi DOYU's avatar Hiroshi DOYU Committed by Tony Lindgren

OMAP: iommu: add initial debugfs support

This enables to peek the following data.

$ /debug/iommu/isp# ls
mem             nr_tlb_entries  regs
mmap            pagetable       tlb
$ /debug/iommu/isp# head pagetable
L:      da:      pa:
-----------------------------------------
2: 00001000 8ae4a002
2: 00002000 8e7bb002
2: 00003000 8ae49002
2: 00004000 8ae65002
.....
Signed-off-by: default avatarHiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 613f7769
......@@ -217,10 +217,19 @@ static ssize_t omap2_dump_cr(struct iommu *obj, struct cr_regs *cr, char *buf)
}
#define pr_reg(name) \
p += sprintf(p, "%20s: %08x\n", \
__stringify(name), iommu_read_reg(obj, MMU_##name));
static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf)
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 iommu *obj, char *buf, ssize_t len)
{
char *p = buf;
......@@ -242,7 +251,7 @@ static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf)
pr_reg(READ_CAM);
pr_reg(READ_RAM);
pr_reg(EMU_FAULT_AD);
out:
return p - buf;
}
......
......@@ -120,6 +120,10 @@ config OMAP_MBOX_FWK
config OMAP_IOMMU
tristate
config OMAP_IOMMU_DEBUG
depends on OMAP_IOMMU
tristate
choice
prompt "System timer"
default OMAP_MPU_TIMER
......
......@@ -14,6 +14,7 @@ obj-$(CONFIG_ARCH_OMAP16XX) += ocpi.o
obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o
obj-$(CONFIG_OMAP_IOMMU) += iommu.o iovmm.o
obj-$(CONFIG_OMAP_IOMMU_DEBUG) += iommu-debug.o
obj-$(CONFIG_CPU_FREQ) += cpu-omap.o
obj-$(CONFIG_OMAP_DM_TIMER) += dmtimer.o
......
......@@ -95,7 +95,7 @@ struct iommu_functions {
void (*save_ctx)(struct iommu *obj);
void (*restore_ctx)(struct iommu *obj);
ssize_t (*dump_ctx)(struct iommu *obj, char *buf);
ssize_t (*dump_ctx)(struct iommu *obj, char *buf, ssize_t len);
};
struct iommu_platform_data {
......@@ -162,7 +162,7 @@ extern void uninstall_iommu_arch(const struct iommu_functions *ops);
extern int foreach_iommu_device(void *data,
int (*fn)(struct device *, void *));
extern ssize_t iommu_dump_ctx(struct iommu *obj, char *buf);
extern size_t dump_tlb_entries(struct iommu *obj, char *buf);
extern ssize_t iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t len);
extern size_t dump_tlb_entries(struct iommu *obj, char *buf, ssize_t len);
#endif /* __MACH_IOMMU_H */
/*
* 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/clk.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/debugfs.h>
#include <mach/iommu.h>
#include <mach/iovmm.h>
#include "iopgtable.h"
#define MAXCOLUMN 100 /* for short messages */
static DEFINE_MUTEX(iommu_debug_lock);
static struct dentry *iommu_debug_root;
static ssize_t debug_read_ver(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
u32 ver = iommu_arch_version();
char buf[MAXCOLUMN], *p = buf;
p += sprintf(p, "H/W version: %d.%d\n", (ver >> 4) & 0xf , ver & 0xf);
return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
}
static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct iommu *obj = file->private_data;
char *p, *buf;
ssize_t bytes;
buf = kmalloc(count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
p = buf;
mutex_lock(&iommu_debug_lock);
bytes = 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 iommu *obj = file->private_data;
char *p, *buf;
ssize_t bytes, rest;
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 += 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 ssize_t debug_write_pagetable(struct file *file,
const char __user *userbuf, size_t count, loff_t *ppos)
{
struct iotlb_entry e;
struct cr_regs cr;
int err;
struct iommu *obj = file->private_data;
char buf[MAXCOLUMN], *p = buf;
count = min(count, sizeof(buf));
mutex_lock(&iommu_debug_lock);
if (copy_from_user(p, userbuf, count)) {
mutex_unlock(&iommu_debug_lock);
return -EFAULT;
}
sscanf(p, "%x %x", &cr.cam, &cr.ram);
if (!cr.cam || !cr.ram) {
mutex_unlock(&iommu_debug_lock);
return -EINVAL;
}
iotlb_cr_to_e(&cr, &e);
err = iopgtable_store_entry(obj, &e);
if (err)
dev_err(obj->dev, "%s: fail to store cr\n", __func__);
mutex_unlock(&iommu_debug_lock);
return count;
}
#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 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 iommu *obj = file->private_data;
char *p, *buf;
size_t bytes;
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;
}
static ssize_t debug_read_mmap(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct iommu *obj = file->private_data;
char *p, *buf;
struct iovm_struct *tmp;
int uninitialized_var(i);
ssize_t bytes;
buf = (char *)__get_free_page(GFP_KERNEL);
if (!buf)
return -ENOMEM;
p = buf;
p += sprintf(p, "%-3s %-8s %-8s %6s %8s\n",
"No", "start", "end", "size", "flags");
p += sprintf(p, "-------------------------------------------------\n");
mutex_lock(&iommu_debug_lock);
list_for_each_entry(tmp, &obj->mmap, list) {
size_t len;
const char *str = "%3d %08x-%08x %6x %8x\n";
const int maxcol = 39;
len = tmp->da_end - tmp->da_start;
p += snprintf(p, maxcol, str,
i, tmp->da_start, tmp->da_end, len, tmp->flags);
if (PAGE_SIZE - (p - buf) < maxcol)
break;
i++;
}
bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
mutex_unlock(&iommu_debug_lock);
free_page((unsigned long)buf);
return bytes;
}
static ssize_t debug_read_mem(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct iommu *obj = file->private_data;
char *p, *buf;
struct iovm_struct *area;
ssize_t bytes;
count = min_t(ssize_t, count, PAGE_SIZE);
buf = (char *)__get_free_page(GFP_KERNEL);
if (!buf)
return -ENOMEM;
p = buf;
mutex_lock(&iommu_debug_lock);
area = find_iovm_area(obj, (u32)ppos);
if (IS_ERR(area)) {
bytes = -EINVAL;
goto err_out;
}
memcpy(p, area->va, count);
p += count;
bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
err_out:
mutex_unlock(&iommu_debug_lock);
free_page((unsigned long)buf);
return bytes;
}
static ssize_t debug_write_mem(struct file *file, const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct iommu *obj = file->private_data;
struct iovm_struct *area;
char *p, *buf;
count = min_t(size_t, count, PAGE_SIZE);
buf = (char *)__get_free_page(GFP_KERNEL);
if (!buf)
return -ENOMEM;
p = buf;
mutex_lock(&iommu_debug_lock);
if (copy_from_user(p, userbuf, count)) {
count = -EFAULT;
goto err_out;
}
area = find_iovm_area(obj, (u32)ppos);
if (IS_ERR(area)) {
count = -EINVAL;
goto err_out;
}
memcpy(area->va, p, count);
err_out:
mutex_unlock(&iommu_debug_lock);
free_page((unsigned long)buf);
return count;
}
static int debug_open_generic(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
#define DEBUG_FOPS(name) \
static const struct file_operations debug_##name##_fops = { \
.open = debug_open_generic, \
.read = debug_read_##name, \
.write = debug_write_##name, \
};
#define DEBUG_FOPS_RO(name) \
static const struct file_operations debug_##name##_fops = { \
.open = debug_open_generic, \
.read = debug_read_##name, \
};
DEBUG_FOPS_RO(ver);
DEBUG_FOPS_RO(regs);
DEBUG_FOPS_RO(tlb);
DEBUG_FOPS(pagetable);
DEBUG_FOPS_RO(mmap);
DEBUG_FOPS(mem);
#define __DEBUG_ADD_FILE(attr, mode) \
{ \
struct dentry *dent; \
dent = debugfs_create_file(#attr, mode, parent, \
obj, &debug_##attr##_fops); \
if (!dent) \
return -ENOMEM; \
}
#define DEBUG_ADD_FILE(name) __DEBUG_ADD_FILE(name, 600)
#define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 400)
static int iommu_debug_register(struct device *dev, void *data)
{
struct platform_device *pdev = to_platform_device(dev);
struct iommu *obj = platform_get_drvdata(pdev);
struct dentry *d, *parent;
if (!obj || !obj->dev)
return -EINVAL;
d = debugfs_create_dir(obj->name, iommu_debug_root);
if (!d)
return -ENOMEM;
parent = d;
d = debugfs_create_u8("nr_tlb_entries", 400, parent,
(u8 *)&obj->nr_tlb_entries);
if (!d)
return -ENOMEM;
DEBUG_ADD_FILE_RO(ver);
DEBUG_ADD_FILE_RO(regs);
DEBUG_ADD_FILE_RO(tlb);
DEBUG_ADD_FILE(pagetable);
DEBUG_ADD_FILE_RO(mmap);
DEBUG_ADD_FILE(mem);
return 0;
}
static int __init iommu_debug_init(void)
{
struct dentry *d;
int err;
d = debugfs_create_dir("iommu", NULL);
if (!d)
return -ENOMEM;
iommu_debug_root = d;
err = foreach_iommu_device(d, iommu_debug_register);
if (err)
goto err_out;
return 0;
err_out:
debugfs_remove_recursive(iommu_debug_root);
return err;
}
module_init(iommu_debug_init)
static void __exit iommu_debugfs_exit(void)
{
debugfs_remove_recursive(iommu_debug_root);
}
module_exit(iommu_debugfs_exit)
MODULE_DESCRIPTION("omap iommu: debugfs interface");
MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
MODULE_LICENSE("GPL v2");
......@@ -351,16 +351,14 @@ EXPORT_SYMBOL_GPL(flush_iotlb_all);
#if defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE)
ssize_t iommu_dump_ctx(struct iommu *obj, char *buf)
ssize_t iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t bytes)
{
ssize_t bytes;
if (!obj || !buf)
return -EINVAL;
clk_enable(obj->clk);
bytes = arch_iommu->dump_ctx(obj, buf);
bytes = arch_iommu->dump_ctx(obj, buf, bytes);
clk_disable(obj->clk);
......@@ -368,7 +366,7 @@ ssize_t iommu_dump_ctx(struct iommu *obj, char *buf)
}
EXPORT_SYMBOL_GPL(iommu_dump_ctx);
static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs)
static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs, int num)
{
int i;
struct iotlb_lock saved, l;
......@@ -379,7 +377,7 @@ static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs)
iotlb_lock_get(obj, &saved);
memcpy(&l, &saved, sizeof(saved));
for (i = 0; i < obj->nr_tlb_entries; i++) {
for (i = 0; i < num; i++) {
struct cr_regs tmp;
iotlb_lock_get(obj, &l);
......@@ -402,18 +400,21 @@ static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs)
* @obj: target iommu
* @buf: output buffer
**/
size_t dump_tlb_entries(struct iommu *obj, char *buf)
size_t dump_tlb_entries(struct iommu *obj, char *buf, ssize_t bytes)
{
int i, n;
int i, num;
struct cr_regs *cr;
char *p = buf;
cr = kcalloc(obj->nr_tlb_entries, sizeof(*cr), GFP_KERNEL);
num = bytes / sizeof(*cr);
num = min(obj->nr_tlb_entries, num);
cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
if (!cr)
return 0;
n = __dump_tlb_entries(obj, cr);
for (i = 0; i < n; i++)
num = __dump_tlb_entries(obj, cr, num);
for (i = 0; i < num; i++)
p += iotlb_dump_cr(obj, cr + i, p);
kfree(cr);
......
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