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Commit 4e1e4ed2 authored by Mitchel Humpherys's avatar Mitchel Humpherys
Browse files

iommu: Create iommu debugfs directory from IOMMU code 



Currently we're creating an "iommu" debugfs directory from the
iommu-debug code.  Other IOMMU modules might want to make use of this
same directory, so create it from the IOMMU framework code itself.

Change-Id: I679fdfc34ba5fcbd927dc5981438c6fabcfa3639
Signed-off-by: default avatarMitchel Humpherys <mitchelh@codeaurora.org>
parent 124d5873

drivers/iommu/iommu-debug.c

+18 −16
Original line number Diff line number Diff line
@@ -22,8 +22,6 @@ 
#include <linux/slab.h>

#include <linux/uaccess.h>



static struct dentry *debugfs_top_dir;



#ifdef CONFIG_IOMMU_DEBUG_TRACKING



static DEFINE_MUTEX(iommu_debug_attachments_lock);
@@ -200,7 +198,7 @@ static int iommu_debug_init_tracking(void) 


	mutex_lock(&iommu_debug_attachments_lock);

	debugfs_attachments_dir = debugfs_create_dir("attachments",

						     debugfs_top_dir);

						     iommu_debugfs_top);

	if (!debugfs_attachments_dir) {

		pr_err("Couldn't create iommu/attachments debugfs directory\n");

		ret = -ENODEV;
@@ -215,8 +213,14 @@ out_unlock: 
	mutex_unlock(&iommu_debug_attachments_lock);

	return ret;

}



static void iommu_debug_destroy_tracking(void)

{

	debugfs_remove_recursive(debugfs_attachments_dir);

}

#else

static inline int iommu_debug_init_tracking(void) { return 0; }

static inline void iommu_debug_destroy_tracking(void) { }

#endif



#ifdef CONFIG_IOMMU_TESTS
@@ -809,7 +813,7 @@ err: 
static int iommu_debug_init_tests(void)

{

	debugfs_tests_dir = debugfs_create_dir("tests",

					       debugfs_top_dir);

					       iommu_debugfs_top);

	if (!debugfs_tests_dir) {

		pr_err("Couldn't create iommu/tests debugfs directory\n");

		return -ENODEV;
@@ -818,33 +822,31 @@ static int iommu_debug_init_tests(void) 
	return bus_for_each_dev(&platform_bus_type, NULL, NULL,

				snarf_iommu_devices);

}



static void iommu_debug_destroy_tests(void)

{

	debugfs_remove_recursive(debugfs_tests_dir);

}

#else

static inline int iommu_debug_init_tests(void) { return 0; }

static inline void iommu_debug_destroy_tests(void) { }

#endif



static int iommu_debug_init(void)

{

	debugfs_top_dir = debugfs_create_dir("iommu", NULL);

	if (!debugfs_top_dir) {

		pr_err("Couldn't create iommu debugfs directory\n");

		return -ENODEV;

	}



	if (iommu_debug_init_tracking())

		goto err;

		return -ENODEV;



	if (iommu_debug_init_tests())

		goto err;

		return -ENODEV;



	return 0;

err:

	debugfs_remove_recursive(debugfs_top_dir);

	return -ENODEV;

}



static void iommu_debug_exit(void)

{

	debugfs_remove_recursive(debugfs_top_dir);

	iommu_debug_destroy_tracking();

	iommu_debug_destroy_tests();

}



module_init(iommu_debug_init);

drivers/iommu/iommu.c

+9 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include <linux/err.h>

#include <linux/pci.h>

#include <linux/bitops.h>

#include <linux/debugfs.h>

#include <trace/events/iommu.h>



#include "iommu-debug.h"
@@ -1269,6 +1270,8 @@ void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) 
}

EXPORT_SYMBOL_GPL(iommu_domain_window_disable);



struct dentry *iommu_debugfs_top;



static int __init iommu_init(void)

{

	iommu_group_kset = kset_create_and_add("iommu_groups",
@@ -1278,6 +1281,12 @@ static int __init iommu_init(void) 


	BUG_ON(!iommu_group_kset);



	iommu_debugfs_top = debugfs_create_dir("iommu", NULL);

	if (!iommu_debugfs_top) {

		pr_err("Couldn't create iommu debugfs directory\n");

		return -ENODEV;

	}



	return 0;

}

arch_initcall(iommu_init);

include/linux/iommu.h

+2 −0
Original line number Diff line number Diff line
@@ -97,6 +97,8 @@ enum iommu_attr { 
	DOMAIN_ATTR_MAX,

};



extern struct dentry *iommu_debugfs_top;



#ifdef CONFIG_IOMMU_API



/**