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Commit 805b8104 authored by Mitchel Humpherys's avatar Mitchel Humpherys
Browse files

iommu/iommu-debug: Add debugfs file to trigger context faults 



It can be useful during development to trigger faults.  Add a debugfs
file to do so.

Change-Id: Ic7b304ef0d908ebd506979f0c87189e34d7dfc67
Signed-off-by: default avatarMitchel Humpherys <mitchelh@codeaurora.org>
parent 4e5bd404

drivers/iommu/iommu-debug.c

+37 −8
Original line number Diff line number Diff line
@@ -79,6 +79,23 @@ static const struct file_operations iommu_debug_attachment_info_fops = { 
	.release = single_release,

};



static ssize_t iommu_debug_attachment_trigger_fault_write(

	struct file *file, const char __user *ubuf, size_t count,

	loff_t *offset)

{

	struct iommu_debug_attachment *attach = file->private_data;



	iommu_trigger_fault(attach->domain);



	return count;

}



static const struct file_operations

iommu_debug_attachment_trigger_fault_fops = {

	.open	= simple_open,

	.write	= iommu_debug_attachment_trigger_fault_write,

};



void iommu_debug_attach_device(struct iommu_domain *domain,

			       struct device *dev)

{
@@ -91,11 +108,11 @@ void iommu_debug_attach_device(struct iommu_domain *domain, 
	uuid_le_gen(&uuid);

	attach_name = kasprintf(GFP_KERNEL, "%s-%pUl", dev_name(dev), uuid.b);

	if (!attach_name)

		goto unlock;

		goto err_unlock;



	attach = kmalloc(sizeof(*attach), GFP_KERNEL);

	if (!attach)

		goto free_attach_name;

		goto err_free_attach_name;



	attach->domain = domain;

	attach->dev = dev;
@@ -106,7 +123,7 @@ void iommu_debug_attach_device(struct iommu_domain *domain, 
		pr_err("Couldn't create iommu/attachments/%s debugfs directory for domain 0x%p\n",

		       attach_name, domain);

		kfree(attach);

		goto free_attach_name;

		goto err_free_attach_name;

	}



	if (!debugfs_create_file(
@@ -114,15 +131,27 @@ void iommu_debug_attach_device(struct iommu_domain *domain, 
		    &iommu_debug_attachment_info_fops)) {

		pr_err("Couldn't create iommu/attachments/%s/info debugfs file for domain 0x%p\n",

		       dev_name(dev), domain);

		debugfs_remove_recursive(attach->dentry);

		kfree(attach);

		goto unlock;

		goto err_rmdir;

	}



	if (!debugfs_create_file(

		    "trigger_fault", S_IRUSR, attach->dentry, attach,

		    &iommu_debug_attachment_trigger_fault_fops)) {

		pr_err("Couldn't create iommu/attachments/%s/trigger_fault debugfs file for domain 0x%p\n",

		       dev_name(dev), domain);

		goto err_rmdir;

	}



	list_add(&attach->list, &iommu_debug_attachments);

free_attach_name:

	kfree(attach_name);

unlock:

	mutex_unlock(&iommu_debug_attachments_lock);

	return;

err_rmdir:

	debugfs_remove_recursive(attach->dentry);

	kfree(attach);

err_free_attach_name:

	kfree(attach_name);

err_unlock:

	mutex_unlock(&iommu_debug_attachments_lock);

}