Commit d1313e78 authored by Thierry Reding's avatar Thierry Reding

iommu/tegra-smmu: Add debugfs support

Provide clients and swgroups files in debugfs. These files show for
which clients IOMMU translation is enabled and which ASID is associated
with each SWGROUP.

Cc: Hiroshi Doyu <hdoyu@nvidia.com>
Acked-by: default avatarJoerg Roedel <jroedel@suse.de>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent e660df07
...@@ -7,6 +7,7 @@ ...@@ -7,6 +7,7 @@
*/ */
#include <linux/bitops.h> #include <linux/bitops.h>
#include <linux/debugfs.h>
#include <linux/err.h> #include <linux/err.h>
#include <linux/iommu.h> #include <linux/iommu.h>
#include <linux/kernel.h> #include <linux/kernel.h>
...@@ -31,6 +32,8 @@ struct tegra_smmu { ...@@ -31,6 +32,8 @@ struct tegra_smmu {
struct mutex lock; struct mutex lock;
struct list_head list; struct list_head list;
struct dentry *debugfs;
}; };
struct tegra_smmu_as { struct tegra_smmu_as {
...@@ -673,6 +676,103 @@ static void tegra_smmu_ahb_enable(void) ...@@ -673,6 +676,103 @@ static void tegra_smmu_ahb_enable(void)
} }
} }
static int tegra_smmu_swgroups_show(struct seq_file *s, void *data)
{
struct tegra_smmu *smmu = s->private;
unsigned int i;
u32 value;
seq_printf(s, "swgroup enabled ASID\n");
seq_printf(s, "------------------------\n");
for (i = 0; i < smmu->soc->num_swgroups; i++) {
const struct tegra_smmu_swgroup *group = &smmu->soc->swgroups[i];
const char *status;
unsigned int asid;
value = smmu_readl(smmu, group->reg);
if (value & SMMU_ASID_ENABLE)
status = "yes";
else
status = "no";
asid = value & SMMU_ASID_MASK;
seq_printf(s, "%-9s %-7s %#04x\n", group->name, status,
asid);
}
return 0;
}
static int tegra_smmu_swgroups_open(struct inode *inode, struct file *file)
{
return single_open(file, tegra_smmu_swgroups_show, inode->i_private);
}
static const struct file_operations tegra_smmu_swgroups_fops = {
.open = tegra_smmu_swgroups_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int tegra_smmu_clients_show(struct seq_file *s, void *data)
{
struct tegra_smmu *smmu = s->private;
unsigned int i;
u32 value;
seq_printf(s, "client enabled\n");
seq_printf(s, "--------------------\n");
for (i = 0; i < smmu->soc->num_clients; i++) {
const struct tegra_mc_client *client = &smmu->soc->clients[i];
const char *status;
value = smmu_readl(smmu, client->smmu.reg);
if (value & BIT(client->smmu.bit))
status = "yes";
else
status = "no";
seq_printf(s, "%-12s %s\n", client->name, status);
}
return 0;
}
static int tegra_smmu_clients_open(struct inode *inode, struct file *file)
{
return single_open(file, tegra_smmu_clients_show, inode->i_private);
}
static const struct file_operations tegra_smmu_clients_fops = {
.open = tegra_smmu_clients_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void tegra_smmu_debugfs_init(struct tegra_smmu *smmu)
{
smmu->debugfs = debugfs_create_dir("smmu", NULL);
if (!smmu->debugfs)
return;
debugfs_create_file("swgroups", S_IRUGO, smmu->debugfs, smmu,
&tegra_smmu_swgroups_fops);
debugfs_create_file("clients", S_IRUGO, smmu->debugfs, smmu,
&tegra_smmu_clients_fops);
}
static void tegra_smmu_debugfs_exit(struct tegra_smmu *smmu)
{
debugfs_remove_recursive(smmu->debugfs);
}
struct tegra_smmu *tegra_smmu_probe(struct device *dev, struct tegra_smmu *tegra_smmu_probe(struct device *dev,
const struct tegra_smmu_soc *soc, const struct tegra_smmu_soc *soc,
struct tegra_mc *mc) struct tegra_mc *mc)
...@@ -743,5 +843,14 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev, ...@@ -743,5 +843,14 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
if (err < 0) if (err < 0)
return ERR_PTR(err); return ERR_PTR(err);
if (IS_ENABLED(CONFIG_DEBUG_FS))
tegra_smmu_debugfs_init(smmu);
return smmu; return smmu;
} }
void tegra_smmu_remove(struct tegra_smmu *smmu)
{
if (IS_ENABLED(CONFIG_DEBUG_FS))
tegra_smmu_debugfs_exit(smmu);
}
...@@ -72,6 +72,7 @@ struct tegra_smmu; ...@@ -72,6 +72,7 @@ struct tegra_smmu;
struct tegra_smmu *tegra_smmu_probe(struct device *dev, struct tegra_smmu *tegra_smmu_probe(struct device *dev,
const struct tegra_smmu_soc *soc, const struct tegra_smmu_soc *soc,
struct tegra_mc *mc); struct tegra_mc *mc);
void tegra_smmu_remove(struct tegra_smmu *smmu);
#else #else
static inline struct tegra_smmu * static inline struct tegra_smmu *
tegra_smmu_probe(struct device *dev, const struct tegra_smmu_soc *soc, tegra_smmu_probe(struct device *dev, const struct tegra_smmu_soc *soc,
...@@ -79,6 +80,10 @@ tegra_smmu_probe(struct device *dev, const struct tegra_smmu_soc *soc, ...@@ -79,6 +80,10 @@ tegra_smmu_probe(struct device *dev, const struct tegra_smmu_soc *soc,
{ {
return NULL; return NULL;
} }
static inline void tegra_smmu_remove(struct tegra_smmu *smmu)
{
}
#endif #endif
struct tegra_mc_soc { struct tegra_mc_soc {
......
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