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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

drivers/iommu/tegra-smmu.c

+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);

}

include/soc/tegra/mc.h

+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 {