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x86/amd-iommu: Introduce global dev_data_list 

This list keeps all allocated iommu_dev_data structs in a
list together. This is needed for instances that have no
associated device.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2011-06-09 12:24:45 +02:00
parent 39c555460c
commit 8fa5f802ab
2 changed files with 48 additions and 9 deletions
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1
arch/x86/include/asm/amd_iommu_types.h
View File

@ -310,6 +310,7 @@ 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 *dev; /* Device this data belong to */
struct device *alias; /* The Alias Device */
struct protection_domain *domain; /* Domain the device is bound to */

56
arch/x86/kernel/amd_iommu.c
View File

@ -45,6 +45,10 @@ static DEFINE_RWLOCK(amd_iommu_devtable_lock);
static LIST_HEAD(iommu_pd_list);
static DEFINE_SPINLOCK(iommu_pd_list_lock);
/* List of all available dev_data structures */
static LIST_HEAD(dev_data_list);
static DEFINE_SPINLOCK(dev_data_list_lock);
/*
* Domain for untranslated devices - only allocated
* if iommu=pt passed on kernel cmd line.
@ -68,6 +72,35 @@ static void update_domain(struct protection_domain *domain);
*
****************************************************************************/
static struct iommu_dev_data *alloc_dev_data(void)
{
struct iommu_dev_data *dev_data;
unsigned long flags;
dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
if (!dev_data)
return NULL;
atomic_set(&dev_data->bind, 0);
spin_lock_irqsave(&dev_data_list_lock, flags);
list_add_tail(&dev_data->dev_data_list, &dev_data_list);
spin_unlock_irqrestore(&dev_data_list_lock, flags);
return dev_data;
}
static void free_dev_data(struct iommu_dev_data *dev_data)
{
unsigned long flags;
spin_lock_irqsave(&dev_data_list_lock, flags);
list_del(&dev_data->dev_data_list);
spin_unlock_irqrestore(&dev_data_list_lock, flags);
kfree(dev_data);
}
static inline u16 get_device_id(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
@ -139,32 +172,28 @@ static int iommu_init_device(struct device *dev)
{
struct iommu_dev_data *dev_data;
struct pci_dev *pdev;
u16 devid, alias;
u16 alias;
if (dev->archdata.iommu)
return 0;
dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
dev_data = alloc_dev_data();
if (!dev_data)
return -ENOMEM;
dev_data->dev = dev;
devid = get_device_id(dev);
alias = amd_iommu_alias_table[devid];
alias = amd_iommu_alias_table[get_device_id(dev)];
pdev = pci_get_bus_and_slot(PCI_BUS(alias), alias & 0xff);
if (pdev)
dev_data->alias = &pdev->dev;
else {
kfree(dev_data);
free_dev_data(dev_data);
return -ENOTSUPP;
}
atomic_set(&dev_data->bind, 0);
dev->archdata.iommu = dev_data;
return 0;
}
@ -184,11 +213,16 @@ static void iommu_ignore_device(struct device *dev)
static void iommu_uninit_device(struct device *dev)
{
kfree(dev->archdata.iommu);
/*
* Nothing to do here - we keep dev_data around for unplugged devices
* and reuse it when the device is re-plugged - not doing so would
* introduce a ton of races.
*/
}
void __init amd_iommu_uninit_devices(void)
{
struct iommu_dev_data *dev_data, *n;
struct pci_dev *pdev = NULL;
for_each_pci_dev(pdev) {
@ -198,6 +232,10 @@ void __init amd_iommu_uninit_devices(void)
iommu_uninit_device(&pdev->dev);
}
/* Free all of our dev_data structures */
list_for_each_entry_safe(dev_data, n, &dev_data_list, dev_data_list)
free_dev_data(dev_data);
}
int __init amd_iommu_init_devices(void)