From: Thierry Reding <tred...@nvidia.com>
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 <hd...@nvidia.com>
Signed-off-by: Thierry Reding <tred...@nvidia.com>
---
drivers/iommu/tegra-smmu.c | 109 +++++++++++++++++++++++++++++++++++++++++++++
include/soc/tegra/mc.h | 5 +++
2 files changed, 114 insertions(+)
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 6e134c7c227f..fff45b3d3e57 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -6,6 +6,7 @@
* published by the Free Software Foundation.
*/
+#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/iommu.h>
#include <linux/kernel.h>
@@ -28,6 +29,8 @@ struct tegra_smmu {
struct mutex lock;
struct list_head list;
+
+ struct dentry *debugfs;
};
struct tegra_smmu_as {
@@ -662,6 +665,103 @@ 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,
const struct tegra_smmu_soc *soc,
struct tegra_mc *mc)
@@ -728,5 +828,14 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
if (err < 0)
return ERR_PTR(err);
+ if (IS_ENABLED(CONFIG_DEBUG_FS))
+ tegra_smmu_debugfs_init(smmu);
+
return smmu;
}
+
+void tegra_smmu_remove(struct tegra_smmu *smmu)
+{
+ if (IS_ENABLED(CONFIG_DEBUG_FS))
+ tegra_smmu_debugfs_exit(smmu);
+}
diff --git a/include/soc/tegra/mc.h b/include/soc/tegra/mc.h
index 63deb8d9f82a..09a3dabf2ea7 100644
--- a/include/soc/tegra/mc.h
+++ b/include/soc/tegra/mc.h
@@ -71,6 +71,7 @@ struct tegra_smmu;
struct tegra_smmu *tegra_smmu_probe(struct device *dev,
const struct tegra_smmu_soc *soc,
struct tegra_mc *mc);
+void tegra_smmu_remove(struct tegra_smmu *smmu);
#else
static inline struct tegra_smmu *
tegra_smmu_probe(struct device *dev, const struct tegra_smmu_soc *soc,
@@ -78,6 +79,10 @@ tegra_smmu_probe(struct device *dev, const struct
tegra_smmu_soc *soc,
{
return NULL;
}
+
+static inline void tegra_smmu_remove(struct tegra_smmu *smmu)
+{
+}
#endif
struct tegra_mc_soc {
--
2.3.2
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
