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Date: Fri, 14 Sep 2012 10:22:00 -0600
From: Stephen Warren <swarren@...dotorg.org>
To: Joerg Roedel <joerg.roedel@....com>
Cc: linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
Hiroshi Doyu <hdoyu@...dia.com>,
Stephen Warren <swarren@...dia.com>
Subject: [PATCH REPOST] iommu/tegra: smmu: Use debugfs_create_dir for directory
From: Hiroshi Doyu <hdoyu@...dia.com>
The commit c3b1a35 "debugfs: make sure that debugfs_create_file() gets
used only for regulars" doesn't allow to use debugfs_create_file() for
dir. Keep debugfs data in smmu_device instead of directory's i_private.
Signed-off-by: Hiroshi Doyu <hdoyu@...dia.com>
Signed-off-by: Stephen Warren <swarren@...dia.com>
---
drivers/iommu/tegra-smmu.c | 52 +++++++++++++++++++++++++++++--------------
1 files changed, 35 insertions(+), 17 deletions(-)
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 5e51fb7..c749f96 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -246,6 +246,12 @@ struct smmu_as {
spinlock_t client_lock; /* for client list */
};
+struct smmu_debugfs_info {
+ struct smmu_device *smmu;
+ int mc;
+ int cache;
+};
+
/*
* Per SMMU device - IOMMU device
*/
@@ -267,6 +273,7 @@ struct smmu_device {
unsigned long asid_security;
struct dentry *debugfs_root;
+ struct smmu_debugfs_info *debugfs_info;
struct device_node *ahb;
@@ -920,9 +927,10 @@ static ssize_t smmu_debugfs_stats_write(struct file *file,
const char __user *buffer,
size_t count, loff_t *pos)
{
+ struct smmu_debugfs_info *info;
struct smmu_device *smmu;
struct dentry *dent;
- int i, cache, mc;
+ int i;
enum {
_OFF = 0,
_ON,
@@ -950,11 +958,10 @@ static ssize_t smmu_debugfs_stats_write(struct file *file,
return -EINVAL;
dent = file->f_dentry;
- cache = (int)dent->d_inode->i_private;
- mc = (int)dent->d_parent->d_inode->i_private;
- smmu = dent->d_parent->d_parent->d_inode->i_private;
+ info = dent->d_inode->i_private;
+ smmu = info->smmu;
- offs = SMMU_CACHE_CONFIG(cache);
+ offs = SMMU_CACHE_CONFIG(info->cache);
val = smmu_read(smmu, offs);
switch (i) {
case _OFF:
@@ -986,21 +993,21 @@ static ssize_t smmu_debugfs_stats_write(struct file *file,
static int smmu_debugfs_stats_show(struct seq_file *s, void *v)
{
+ struct smmu_debugfs_info *info;
struct smmu_device *smmu;
struct dentry *dent;
- int i, cache, mc;
+ int i;
const char * const stats[] = { "hit", "miss", };
dent = d_find_alias(s->private);
- cache = (int)dent->d_inode->i_private;
- mc = (int)dent->d_parent->d_inode->i_private;
- smmu = dent->d_parent->d_parent->d_inode->i_private;
+ info = dent->d_inode->i_private;
+ smmu = info->smmu;
for (i = 0; i < ARRAY_SIZE(stats); i++) {
u32 val;
size_t offs;
- offs = SMMU_STATS_CACHE_COUNT(mc, cache, i);
+ offs = SMMU_STATS_CACHE_COUNT(info->mc, info->cache, i);
val = smmu_read(smmu, offs);
seq_printf(s, "%s:%08x ", stats[i], val);
@@ -1028,16 +1035,22 @@ static const struct file_operations smmu_debugfs_stats_fops = {
static void smmu_debugfs_delete(struct smmu_device *smmu)
{
debugfs_remove_recursive(smmu->debugfs_root);
+ kfree(smmu->debugfs_info);
}
static void smmu_debugfs_create(struct smmu_device *smmu)
{
int i;
+ size_t bytes;
struct dentry *root;
- root = debugfs_create_file(dev_name(smmu->dev),
- S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
- NULL, smmu, NULL);
+ bytes = ARRAY_SIZE(smmu_debugfs_mc) * ARRAY_SIZE(smmu_debugfs_cache) *
+ sizeof(*smmu->debugfs_info);
+ smmu->debugfs_info = kmalloc(bytes, GFP_KERNEL);
+ if (!smmu->debugfs_info)
+ return;
+
+ root = debugfs_create_dir(dev_name(smmu->dev), NULL);
if (!root)
goto err_out;
smmu->debugfs_root = root;
@@ -1046,18 +1059,23 @@ static void smmu_debugfs_create(struct smmu_device *smmu)
int j;
struct dentry *mc;
- mc = debugfs_create_file(smmu_debugfs_mc[i],
- S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
- root, (void *)i, NULL);
+ mc = debugfs_create_dir(smmu_debugfs_mc[i], root);
if (!mc)
goto err_out;
for (j = 0; j < ARRAY_SIZE(smmu_debugfs_cache); j++) {
struct dentry *cache;
+ struct smmu_debugfs_info *info;
+
+ info = smmu->debugfs_info;
+ info += i * ARRAY_SIZE(smmu_debugfs_mc) + j;
+ info->smmu = smmu;
+ info->mc = i;
+ info->cache = j;
cache = debugfs_create_file(smmu_debugfs_cache[j],
S_IWUGO | S_IRUGO, mc,
- (void *)j,
+ (void *)info,
&smmu_debugfs_stats_fops);
if (!cache)
goto err_out;
--
1.7.0.4
--
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