Commit 71f77580 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

x86/amd-iommu: Store device alias as dev_data pointer 



This finally allows PCI-Device-IDs to be handled by the
IOMMU driver that have no corresponding struct device
present in the system.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 3b03bb74

arch/x86/include/asm/amd_iommu_types.h

+1 −1
Original line number Diff line number Diff line
@@ -311,7 +311,7 @@ struct protection_domain { 
struct iommu_dev_data {

	struct list_head list;		  /* For domain->dev_list */

	struct list_head dev_data_list;	  /* For global dev_data_list */

	struct device *alias;		  /* The Alias Device */

	struct iommu_dev_data *alias_data;/* The alias dev_data */

	struct protection_domain *domain; /* Domain the device is bound to */

	atomic_t bind;			  /* Domain attach reverent count */

	u16 devid;			  /* PCI Device ID */

arch/x86/kernel/amd_iommu.c

+15 −19
Original line number Diff line number Diff line
@@ -203,7 +203,6 @@ static bool check_device(struct device *dev) 
static int iommu_init_device(struct device *dev)

{

	struct iommu_dev_data *dev_data;

	struct pci_dev *pdev;

	u16 alias;



	if (dev->archdata.iommu)
@@ -215,13 +214,16 @@ static int iommu_init_device(struct device *dev) 


	alias = amd_iommu_alias_table[dev_data->devid];

	if (alias != dev_data->devid) {

		pdev = pci_get_bus_and_slot(PCI_BUS(alias), alias & 0xff);

		if (pdev)

			dev_data->alias = &pdev->dev;

		else {

		struct iommu_dev_data *alias_data;



		alias_data = find_dev_data(alias);

		if (alias_data == NULL) {

			pr_err("AMD-Vi: Warning: Unhandled device %s\n",

					dev_name(dev));

			free_dev_data(dev_data);

			return -ENOTSUPP;

		}

		dev_data->alias_data = alias_data;

	}



	dev->archdata.iommu = dev_data;
@@ -1642,14 +1644,8 @@ static int __attach_device(struct iommu_dev_data *dev_data, 
	/* lock domain */

	spin_lock(&domain->lock);



	if (dev_data->alias != NULL) {

		struct iommu_dev_data *alias_data;



		alias_data = get_dev_data(dev_data->alias);



		ret = -EINVAL;

		if (!alias_data)

			goto out_unlock;

	if (dev_data->alias_data != NULL) {

		struct iommu_dev_data *alias_data = dev_data->alias_data;



		/* Some sanity checks */

		ret = -EBUSY;
@@ -1721,7 +1717,6 @@ static int attach_device(struct device *dev, 
 */

static void __detach_device(struct iommu_dev_data *dev_data)

{

	struct iommu_dev_data *alias_data;

	struct protection_domain *domain;

	unsigned long flags;
@@ -1731,8 +1726,9 @@ static void __detach_device(struct iommu_dev_data *dev_data) 


	spin_lock_irqsave(&domain->lock, flags);



	if (dev_data->alias) {

		alias_data = get_dev_data(dev_data->alias);

	if (dev_data->alias_data != NULL) {

		struct iommu_dev_data *alias_data = dev_data->alias_data;



		if (atomic_dec_and_test(&alias_data->bind))

			do_detach(alias_data);

	}
@@ -1779,7 +1775,7 @@ static void detach_device(struct device *dev) 
 */

static struct protection_domain *domain_for_device(struct device *dev)

{

	struct iommu_dev_data *dev_data, *alias_data;

	struct iommu_dev_data *dev_data;

	struct protection_domain *dom = NULL;

	unsigned long flags;
@@ -1788,8 +1784,8 @@ static struct protection_domain *domain_for_device(struct device *dev) 
	if (dev_data->domain)

		return dev_data->domain;



	if (dev_data->alias != NULL) {

		alias_data = get_dev_data(dev_data->alias);

	if (dev_data->alias_data != NULL) {

		struct iommu_dev_data *alias_data = dev_data->alias_data;



		read_lock_irqsave(&amd_iommu_devtable_lock, flags);

		if (alias_data->domain != NULL) {