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iommu/amd: Attach and detach complete alias group

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Change tha device attach and detach semantic to apply to all
devices in an alias group. This means all devices in an
alias group are now attached and detached at the same time.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2014-08-05 17:31:51 +02:00
parent f251e187f2
commit 397111abaa
1 changed files with 20 additions and 26 deletions
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46
drivers/iommu/amd_iommu.c
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@ -2149,35 +2149,29 @@ static void do_detach(struct iommu_dev_data *dev_data)
static int __attach_device(struct iommu_dev_data *dev_data,
struct protection_domain *domain)
{
struct iommu_dev_data *head, *entry;
int ret;
/* lock domain */
spin_lock(&domain->lock);
if (dev_data->alias_data != NULL) {
struct iommu_dev_data *alias_data = dev_data->alias_data;
head = dev_data;
/* Some sanity checks */
ret = -EBUSY;
if (alias_data->domain != NULL &&
alias_data->domain != domain)
goto out_unlock;
if (head->alias_data != NULL)
head = head->alias_data;
if (dev_data->domain != NULL &&
dev_data->domain != domain)
goto out_unlock;
/* Now we have the root of the alias group, if any */
/* Do real assignment */
if (alias_data->domain == NULL)
do_attach(alias_data, domain);
ret = -EBUSY;
if (head->domain != NULL)
goto out_unlock;
atomic_inc(&alias_data->bind);
}
/* Attach alias group root */
do_attach(head, domain);
if (dev_data->domain == NULL)
do_attach(dev_data, domain);
atomic_inc(&dev_data->bind);
/* Attach other devices in the alias group */
list_for_each_entry(entry, &head->alias_list, alias_list)
do_attach(entry, domain);
ret = 0;
@ -2325,6 +2319,7 @@ static int attach_device(struct device *dev,
*/
static void __detach_device(struct iommu_dev_data *dev_data)
{
struct iommu_dev_data *head, *entry;
struct protection_domain *domain;
unsigned long flags;
@ -2334,15 +2329,14 @@ static void __detach_device(struct iommu_dev_data *dev_data)
spin_lock_irqsave(&domain->lock, flags);
if (dev_data->alias_data != NULL) {
struct iommu_dev_data *alias_data = dev_data->alias_data;
head = dev_data;
if (head->alias_data != NULL)
head = head->alias_data;
if (atomic_dec_and_test(&alias_data->bind))
do_detach(alias_data);
}
list_for_each_entry(entry, &head->alias_list, alias_list)
do_detach(entry);
if (atomic_dec_and_test(&dev_data->bind))
do_detach(dev_data);
do_detach(head);
spin_unlock_irqrestore(&domain->lock, flags);