linux/drivers/iommu/omap-iommu-debug.c

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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/module.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/debugfs.h>
#include <plat/iommu.h>
#include <plat/iovmm.h>
#include <plat/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 = omap_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 device *dev = file->private_data;
struct omap_iommu *obj = dev_to_omap_iommu(dev);
char *p, *buf;
ssize_t bytes;
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 device *dev = file->private_data;
struct omap_iommu *obj = dev_to_omap_iommu(dev);
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 += 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 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 device *dev = file->private_data;
struct omap_iommu *obj = dev_to_omap_iommu(dev);
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;
}
omap_iotlb_cr_to_e(&cr, &e);
err = omap_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 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 device *dev = file->private_data;
struct omap_iommu *obj = dev_to_omap_iommu(dev);
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 device *dev = file->private_data;
struct omap_iommu *obj = dev_to_omap_iommu(dev);
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 device *dev = 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 = omap_find_iovm_area(dev, (u32)ppos);
iommu/omap: fix NULL pointer dereference Fix this: root@omap4430-panda:~# cat /debug/iommu/ducati/mem [ 62.725708] Unable to handle kernel NULL pointer dereference at virtual addre ss 0000001c [ 62.725708] pgd = e6240000 [ 62.737091] [0000001c] *pgd=a7168831, *pte=00000000, *ppte=00000000 [ 62.743682] Internal error: Oops: 17 [#1] SMP [ 62.743682] Modules linked in: omap_iommu_debug omap_iovmm virtio_rpmsg_bus o map_remoteproc remoteproc virtio_ring virtio mailbox_mach mailbox [ 62.743682] CPU: 0 Not tainted (3.3.0-rc1-00265-g382f84e-dirty #682) [ 62.743682] PC is at debug_read_mem+0x5c/0xac [omap_iommu_debug] [ 62.743682] LR is at 0x1004 [ 62.777832] pc : [<bf033178>] lr : [<00001004>] psr: 60000013 [ 62.777832] sp : e72c7f40 ip : c0763c00 fp : 00000001 [ 62.777832] r10: 00000000 r9 : 00000000 r8 : e72c7f80 [ 62.777832] r7 : e6ffdc08 r6 : bed1ac78 r5 : 00001000 r4 : e7276000 [ 62.777832] r3 : e60f3460 r2 : 00000000 r1 : e60f38c0 r0 : 00000000 [ 62.777832] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 62.816375] Control: 10c53c7d Table: a624004a DAC: 00000015 [ 62.816375] Process cat (pid: 1176, stack limit = 0xe72c62f8) [ 62.828369] Stack: (0xe72c7f40 to 0xe72c8000) ... [ 62.884185] [<bf033178>] (debug_read_mem+0x5c/0xac [omap_iommu_debug]) from [<c010e354>] (vfs_read+0xac/0x130) [ 62.884185] [<c010e354>] (vfs_read+0xac/0x130) from [<c010e4a8>] (sys_read+0x40/0x70) [ 62.884185] [<c010e4a8>] (sys_read+0x40/0x70) from [<c0014a00>] (ret_fast_syscall+0x0/0x3c) Fix also its 'echo bla > /debug/iommu/ducati/mem' Oops sibling, too. Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com> Cc: Tony Lindgren <tony@atomide.com> Cc: Hiroshi Doyu <hdoyu@nvidia.com> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Joerg Roedel <Joerg.Roedel@amd.com> Cc: stable@vger.kernel.org Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
2012-02-22 17:14:46 +08:00
if (!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 device *dev = 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 = omap_find_iovm_area(dev, (u32)ppos);
iommu/omap: fix NULL pointer dereference Fix this: root@omap4430-panda:~# cat /debug/iommu/ducati/mem [ 62.725708] Unable to handle kernel NULL pointer dereference at virtual addre ss 0000001c [ 62.725708] pgd = e6240000 [ 62.737091] [0000001c] *pgd=a7168831, *pte=00000000, *ppte=00000000 [ 62.743682] Internal error: Oops: 17 [#1] SMP [ 62.743682] Modules linked in: omap_iommu_debug omap_iovmm virtio_rpmsg_bus o map_remoteproc remoteproc virtio_ring virtio mailbox_mach mailbox [ 62.743682] CPU: 0 Not tainted (3.3.0-rc1-00265-g382f84e-dirty #682) [ 62.743682] PC is at debug_read_mem+0x5c/0xac [omap_iommu_debug] [ 62.743682] LR is at 0x1004 [ 62.777832] pc : [<bf033178>] lr : [<00001004>] psr: 60000013 [ 62.777832] sp : e72c7f40 ip : c0763c00 fp : 00000001 [ 62.777832] r10: 00000000 r9 : 00000000 r8 : e72c7f80 [ 62.777832] r7 : e6ffdc08 r6 : bed1ac78 r5 : 00001000 r4 : e7276000 [ 62.777832] r3 : e60f3460 r2 : 00000000 r1 : e60f38c0 r0 : 00000000 [ 62.777832] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 62.816375] Control: 10c53c7d Table: a624004a DAC: 00000015 [ 62.816375] Process cat (pid: 1176, stack limit = 0xe72c62f8) [ 62.828369] Stack: (0xe72c7f40 to 0xe72c8000) ... [ 62.884185] [<bf033178>] (debug_read_mem+0x5c/0xac [omap_iommu_debug]) from [<c010e354>] (vfs_read+0xac/0x130) [ 62.884185] [<c010e354>] (vfs_read+0xac/0x130) from [<c010e4a8>] (sys_read+0x40/0x70) [ 62.884185] [<c010e4a8>] (sys_read+0x40/0x70) from [<c0014a00>] (ret_fast_syscall+0x0/0x3c) Fix also its 'echo bla > /debug/iommu/ducati/mem' Oops sibling, too. Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com> Cc: Tony Lindgren <tony@atomide.com> Cc: Hiroshi Doyu <hdoyu@nvidia.com> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Joerg Roedel <Joerg.Roedel@amd.com> Cc: stable@vger.kernel.org Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
2012-02-22 17:14:46 +08:00
if (!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;
}
#define DEBUG_FOPS(name) \
static const struct file_operations debug_##name##_fops = { \
.open = simple_open, \
.read = debug_read_##name, \
.write = debug_write_##name, \
.llseek = generic_file_llseek, \
};
#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(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, \
dev, &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 omap_iommu *obj = platform_get_drvdata(pdev);
struct omap_iommu_arch_data *arch_data;
struct dentry *d, *parent;
if (!obj || !obj->dev)
return -EINVAL;
arch_data = kzalloc(sizeof(*arch_data), GFP_KERNEL);
if (!arch_data)
return -ENOMEM;
arch_data->iommu_dev = obj;
dev->archdata.iommu = arch_data;
d = debugfs_create_dir(obj->name, iommu_debug_root);
if (!d)
goto nomem;
parent = d;
d = debugfs_create_u8("nr_tlb_entries", 400, parent,
(u8 *)&obj->nr_tlb_entries);
if (!d)
goto nomem;
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;
nomem:
kfree(arch_data);
return -ENOMEM;
}
static int iommu_debug_unregister(struct device *dev, void *data)
{
if (!dev->archdata.iommu)
return 0;
kfree(dev->archdata.iommu);
dev->archdata.iommu = NULL;
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 = omap_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);
omap_foreach_iommu_device(NULL, iommu_debug_unregister);
}
module_exit(iommu_debugfs_exit)
MODULE_DESCRIPTION("omap iommu: debugfs interface");
MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
MODULE_LICENSE("GPL v2");