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

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// SPDX-License-Identifier: GPL-2.0-only
/*
* omap iommu: debugfs interface
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
*/
#include <linux/err.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 08:04:11 +00:00
#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);
if (bytes < 0)
goto err;
bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);
err:
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 tlb_show(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 pagetable_show(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_FOPS_RO(name) \
static const struct file_operations name##_fops = { \
.open = simple_open, \
.read = debug_read_##name, \
.llseek = generic_file_llseek, \
}
DEBUG_FOPS_RO(regs);
DEFINE_SHOW_ATTRIBUTE(tlb);
DEFINE_SHOW_ATTRIBUTE(pagetable);
void omap_iommu_debugfs_add(struct omap_iommu *obj)
{
struct dentry *d;
if (!iommu_debug_root)
return;
d = debugfs_create_dir(obj->name, iommu_debug_root);
obj->debug_dir = d;
debugfs_create_u32("nr_tlb_entries", 0400, d, &obj->nr_tlb_entries);
debugfs_create_file("regs", 0400, d, obj, &regs_fops);
debugfs_create_file("tlb", 0400, d, obj, &tlb_fops);
debugfs_create_file("pagetable", 0400, d, obj, &pagetable_fops);
}
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);
}
void __exit omap_iommu_debugfs_exit(void)
{
debugfs_remove(iommu_debug_root);
}