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x86/amd-iommu: Add ATS enable/disable code

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This patch adds the necessary code to the AMD IOMMU driver
for enabling and disabling the ATS capability on a device
and to setup the IOMMU data structures correctly.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2011-04-05 15:31:08 +02:00
parent 60f723b411
commit fd7b5535e1
2 changed files with 30 additions and 6 deletions
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2
arch/x86/include/asm/amd_iommu_types.h
View File

@ -216,6 +216,8 @@
#define IOMMU_PTE_IR (1ULL << 61)
#define IOMMU_PTE_IW (1ULL << 62)
#define DTE_FLAG_IOTLB 0x01
#define IOMMU_PAGE_MASK (((1ULL << 52) - 1) & ~0xfffULL)
#define IOMMU_PTE_PRESENT(pte) ((pte) & IOMMU_PTE_P)
#define IOMMU_PTE_PAGE(pte) (phys_to_virt((pte) & IOMMU_PAGE_MASK))

34
arch/x86/kernel/amd_iommu.c
View File

@ -1452,17 +1452,22 @@ static bool dma_ops_domain(struct protection_domain *domain)
return domain->flags & PD_DMA_OPS_MASK;
}
static void set_dte_entry(u16 devid, struct protection_domain *domain)
static void set_dte_entry(u16 devid, struct protection_domain *domain, bool ats)
{
u64 pte_root = virt_to_phys(domain->pt_root);
u32 flags = 0;
pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK)
<< DEV_ENTRY_MODE_SHIFT;
pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | IOMMU_PTE_TV;
amd_iommu_dev_table[devid].data[2] = domain->id;
amd_iommu_dev_table[devid].data[1] = upper_32_bits(pte_root);
amd_iommu_dev_table[devid].data[0] = lower_32_bits(pte_root);
if (ats)
flags |= DTE_FLAG_IOTLB;
amd_iommu_dev_table[devid].data[3] |= flags;
amd_iommu_dev_table[devid].data[2] = domain->id;
amd_iommu_dev_table[devid].data[1] = upper_32_bits(pte_root);
amd_iommu_dev_table[devid].data[0] = lower_32_bits(pte_root);
}
static void clear_dte_entry(u16 devid)
@ -1479,16 +1484,22 @@ static void do_attach(struct device *dev, struct protection_domain *domain)
{
struct iommu_dev_data *dev_data;
struct amd_iommu *iommu;
struct pci_dev *pdev;
bool ats = false;
u16 devid;
devid = get_device_id(dev);
iommu = amd_iommu_rlookup_table[devid];
dev_data = get_dev_data(dev);
pdev = to_pci_dev(dev);
if (amd_iommu_iotlb_sup)
ats = pci_ats_enabled(pdev);
/* Update data structures */
dev_data->domain = domain;
list_add(&dev_data->list, &domain->dev_list);
set_dte_entry(devid, domain);
set_dte_entry(devid, domain, ats);
/* Do reference counting */
domain->dev_iommu[iommu->index] += 1;
@ -1502,11 +1513,13 @@ static void do_detach(struct device *dev)
{
struct iommu_dev_data *dev_data;
struct amd_iommu *iommu;
struct pci_dev *pdev;
u16 devid;
devid = get_device_id(dev);
iommu = amd_iommu_rlookup_table[devid];
dev_data = get_dev_data(dev);
pdev = to_pci_dev(dev);
/* decrease reference counters */
dev_data->domain->dev_iommu[iommu->index] -= 1;
@ -1581,9 +1594,13 @@ out_unlock:
static int attach_device(struct device *dev,
struct protection_domain *domain)
{
struct pci_dev *pdev = to_pci_dev(dev);
unsigned long flags;
int ret;
if (amd_iommu_iotlb_sup)
pci_enable_ats(pdev, PAGE_SHIFT);
write_lock_irqsave(&amd_iommu_devtable_lock, flags);
ret = __attach_device(dev, domain);
write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
@ -1640,12 +1657,16 @@ static void __detach_device(struct device *dev)
*/
static void detach_device(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
unsigned long flags;
/* lock device table */
write_lock_irqsave(&amd_iommu_devtable_lock, flags);
__detach_device(dev);
write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
if (amd_iommu_iotlb_sup && pci_ats_enabled(pdev))
pci_disable_ats(pdev);
}
/*
@ -1795,8 +1816,9 @@ static void update_device_table(struct protection_domain *domain)
struct iommu_dev_data *dev_data;
list_for_each_entry(dev_data, &domain->dev_list, list) {
struct pci_dev *pdev = to_pci_dev(dev_data->dev);
u16 devid = get_device_id(dev_data->dev);
set_dte_entry(devid, domain);
set_dte_entry(devid, domain, pci_ats_enabled(pdev));
}
}