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Commit d1313e78 authored by Thierry Reding's avatar Thierry Reding
Browse files

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
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+109 −0
Original line number Original line Diff line number Diff line
@@ -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 {
	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)
	}
	}
}
}


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,
	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);
}
+5 −0
Original line number Original line Diff line number Diff line
@@ -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,
{
{
	return NULL;
	return NULL;
}
}

static inline void tegra_smmu_remove(struct tegra_smmu *smmu)
{
}
#endif
#endif


struct tegra_mc_soc {
struct tegra_mc_soc {