mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
iommu/amd: Use iommu_group_get_for_dev()
The common iommu_group_get_for_dev() allows us to greatly simplify our group lookup for a new device. Also, since we insert IVRS aliases into the PCI DMA alias quirks, we should alway come up with the same results as the existing code. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Cc: Joerg Roedel <joro@8bytes.org> Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
parent
c1931090a2
commit
65d5352f12
2 changed files with 5 additions and 160 deletions
|
@ -46,7 +46,6 @@
|
|||
#include "amd_iommu_proto.h"
|
||||
#include "amd_iommu_types.h"
|
||||
#include "irq_remapping.h"
|
||||
#include "pci.h"
|
||||
|
||||
#define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))
|
||||
|
||||
|
@ -133,9 +132,6 @@ static void free_dev_data(struct iommu_dev_data *dev_data)
|
|||
list_del(&dev_data->dev_data_list);
|
||||
spin_unlock_irqrestore(&dev_data_list_lock, flags);
|
||||
|
||||
if (dev_data->group)
|
||||
iommu_group_put(dev_data->group);
|
||||
|
||||
kfree(dev_data);
|
||||
}
|
||||
|
||||
|
@ -264,167 +260,17 @@ static bool check_device(struct device *dev)
|
|||
return true;
|
||||
}
|
||||
|
||||
static struct pci_bus *find_hosted_bus(struct pci_bus *bus)
|
||||
{
|
||||
while (!bus->self) {
|
||||
if (!pci_is_root_bus(bus))
|
||||
bus = bus->parent;
|
||||
else
|
||||
return ERR_PTR(-ENODEV);
|
||||
}
|
||||
|
||||
return bus;
|
||||
}
|
||||
|
||||
#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
|
||||
|
||||
static struct pci_dev *get_isolation_root(struct pci_dev *pdev)
|
||||
{
|
||||
struct pci_dev *dma_pdev = pdev;
|
||||
|
||||
/* Account for quirked devices */
|
||||
swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev));
|
||||
|
||||
/*
|
||||
* If it's a multifunction device that does not support our
|
||||
* required ACS flags, add to the same group as lowest numbered
|
||||
* function that also does not suport the required ACS flags.
|
||||
*/
|
||||
if (dma_pdev->multifunction &&
|
||||
!pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS)) {
|
||||
u8 i, slot = PCI_SLOT(dma_pdev->devfn);
|
||||
|
||||
for (i = 0; i < 8; i++) {
|
||||
struct pci_dev *tmp;
|
||||
|
||||
tmp = pci_get_slot(dma_pdev->bus, PCI_DEVFN(slot, i));
|
||||
if (!tmp)
|
||||
continue;
|
||||
|
||||
if (!pci_acs_enabled(tmp, REQ_ACS_FLAGS)) {
|
||||
swap_pci_ref(&dma_pdev, tmp);
|
||||
break;
|
||||
}
|
||||
pci_dev_put(tmp);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Devices on the root bus go through the iommu. If that's not us,
|
||||
* find the next upstream device and test ACS up to the root bus.
|
||||
* Finding the next device may require skipping virtual buses.
|
||||
*/
|
||||
while (!pci_is_root_bus(dma_pdev->bus)) {
|
||||
struct pci_bus *bus = find_hosted_bus(dma_pdev->bus);
|
||||
if (IS_ERR(bus))
|
||||
break;
|
||||
|
||||
if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS))
|
||||
break;
|
||||
|
||||
swap_pci_ref(&dma_pdev, pci_dev_get(bus->self));
|
||||
}
|
||||
|
||||
return dma_pdev;
|
||||
}
|
||||
|
||||
static int use_pdev_iommu_group(struct pci_dev *pdev, struct device *dev)
|
||||
{
|
||||
struct iommu_group *group = iommu_group_get(&pdev->dev);
|
||||
int ret;
|
||||
|
||||
if (!group) {
|
||||
group = iommu_group_alloc();
|
||||
if (IS_ERR(group))
|
||||
return PTR_ERR(group);
|
||||
|
||||
WARN_ON(&pdev->dev != dev);
|
||||
}
|
||||
|
||||
ret = iommu_group_add_device(group, dev);
|
||||
iommu_group_put(group);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int use_dev_data_iommu_group(struct iommu_dev_data *dev_data,
|
||||
struct device *dev)
|
||||
{
|
||||
if (!dev_data->group) {
|
||||
struct iommu_group *group = iommu_group_alloc();
|
||||
if (IS_ERR(group))
|
||||
return PTR_ERR(group);
|
||||
|
||||
dev_data->group = group;
|
||||
}
|
||||
|
||||
return iommu_group_add_device(dev_data->group, dev);
|
||||
}
|
||||
|
||||
static int init_iommu_group(struct device *dev)
|
||||
{
|
||||
struct iommu_dev_data *dev_data;
|
||||
struct iommu_group *group;
|
||||
struct pci_dev *dma_pdev;
|
||||
int ret;
|
||||
|
||||
group = iommu_group_get(dev);
|
||||
if (group) {
|
||||
iommu_group_put(group);
|
||||
return 0;
|
||||
}
|
||||
group = iommu_group_get_for_dev(dev);
|
||||
|
||||
dev_data = find_dev_data(get_device_id(dev));
|
||||
if (!dev_data)
|
||||
return -ENOMEM;
|
||||
if (IS_ERR(group))
|
||||
return PTR_ERR(group);
|
||||
|
||||
if (dev_data->alias_data) {
|
||||
u16 alias;
|
||||
struct pci_bus *bus;
|
||||
|
||||
if (dev_data->alias_data->group)
|
||||
goto use_group;
|
||||
|
||||
/*
|
||||
* If the alias device exists, it's effectively just a first
|
||||
* level quirk for finding the DMA source.
|
||||
*/
|
||||
alias = amd_iommu_alias_table[dev_data->devid];
|
||||
dma_pdev = pci_get_bus_and_slot(alias >> 8, alias & 0xff);
|
||||
if (dma_pdev) {
|
||||
dma_pdev = get_isolation_root(dma_pdev);
|
||||
goto use_pdev;
|
||||
}
|
||||
|
||||
/*
|
||||
* If the alias is virtual, try to find a parent device
|
||||
* and test whether the IOMMU group is actualy rooted above
|
||||
* the alias. Be careful to also test the parent device if
|
||||
* we think the alias is the root of the group.
|
||||
*/
|
||||
bus = pci_find_bus(0, alias >> 8);
|
||||
if (!bus)
|
||||
goto use_group;
|
||||
|
||||
bus = find_hosted_bus(bus);
|
||||
if (IS_ERR(bus) || !bus->self)
|
||||
goto use_group;
|
||||
|
||||
dma_pdev = get_isolation_root(pci_dev_get(bus->self));
|
||||
if (dma_pdev != bus->self || (dma_pdev->multifunction &&
|
||||
!pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS)))
|
||||
goto use_pdev;
|
||||
|
||||
pci_dev_put(dma_pdev);
|
||||
goto use_group;
|
||||
}
|
||||
|
||||
dma_pdev = get_isolation_root(pci_dev_get(to_pci_dev(dev)));
|
||||
use_pdev:
|
||||
ret = use_pdev_iommu_group(dma_pdev, dev);
|
||||
pci_dev_put(dma_pdev);
|
||||
return ret;
|
||||
use_group:
|
||||
return use_dev_data_iommu_group(dev_data->alias_data, dev);
|
||||
iommu_group_put(group);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __last_alias(struct pci_dev *pdev, u16 alias, void *data)
|
||||
|
|
|
@ -432,7 +432,6 @@ struct iommu_dev_data {
|
|||
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 reference count */
|
||||
struct iommu_group *group; /* IOMMU group for virtual aliases */
|
||||
u16 devid; /* PCI Device ID */
|
||||
bool iommu_v2; /* Device can make use of IOMMUv2 */
|
||||
bool passthrough; /* Default for device is pt_domain */
|
||||
|
|
Loading…
Reference in a new issue