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iommu/amd: Add invalid_ppr callback 

This callback can be used to change the PRI response code
sent to a device when a PPR fault fails.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2011-11-28 14:36:36 +01:00
parent 8736b2c331
commit 175d614673
2 changed files with 86 additions and 5 deletions
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57
drivers/iommu/amd_iommu_v2.c
View File

@ -62,6 +62,7 @@ struct device_state {
struct iommu_domain *domain;
int pasid_levels;
int max_pasids;
amd_iommu_invalid_ppr_cb inv_ppr_cb;
spinlock_t lock;
wait_queue_head_t wq;
};
@ -505,10 +506,31 @@ static void do_fault(struct work_struct *work)
npages = get_user_pages(fault->state->task, fault->state->mm,
fault->address, 1, write, 0, &page, NULL);
if (npages == 1)
if (npages == 1) {
put_page(page);
else
} else if (fault->dev_state->inv_ppr_cb) {
int status;
status = fault->dev_state->inv_ppr_cb(fault->dev_state->pdev,
fault->pasid,
fault->address,
fault->flags);
switch (status) {
case AMD_IOMMU_INV_PRI_RSP_SUCCESS:
set_pri_tag_status(fault->state, fault->tag, PPR_SUCCESS);
break;
case AMD_IOMMU_INV_PRI_RSP_INVALID:
set_pri_tag_status(fault->state, fault->tag, PPR_INVALID);
break;
case AMD_IOMMU_INV_PRI_RSP_FAIL:
set_pri_tag_status(fault->state, fault->tag, PPR_FAILURE);
break;
default:
BUG();
}
} else {
set_pri_tag_status(fault->state, fault->tag, PPR_INVALID);
}
finish_pri_tag(fault->dev_state, fault->state, fault->tag);
@ -828,6 +850,37 @@ void amd_iommu_free_device(struct pci_dev *pdev)
}
EXPORT_SYMBOL(amd_iommu_free_device);
int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev,
amd_iommu_invalid_ppr_cb cb)
{
struct device_state *dev_state;
unsigned long flags;
u16 devid;
int ret;
if (!amd_iommu_v2_supported())
return -ENODEV;
devid = device_id(pdev);
spin_lock_irqsave(&state_lock, flags);
ret = -EINVAL;
dev_state = state_table[devid];
if (dev_state == NULL)
goto out_unlock;
dev_state->inv_ppr_cb = cb;
ret = 0;
out_unlock:
spin_unlock_irqrestore(&state_lock, flags);
return ret;
}
EXPORT_SYMBOL(amd_iommu_set_invalid_ppr_cb);
static int __init amd_iommu_v2_init(void)
{
size_t state_table_size;

34
include/linux/amd-iommu.h
View File

@ -28,9 +28,6 @@ struct task_struct;
struct pci_dev;
extern int amd_iommu_detect(void);
extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
struct task_struct *task);
extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
/**
@ -91,6 +88,37 @@ extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
*/
extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
/**
* amd_iommu_set_invalid_ppr_cb() - Register a call-back for failed
* PRI requests
* @pdev: The PCI device the call-back should be registered for
* @cb: The call-back function
*
* The IOMMUv2 driver invokes this call-back when it is unable to
* successfully handle a PRI request. The device driver can then decide
* which PRI response the device should see. Possible return values for
* the call-back are:
*
* - AMD_IOMMU_INV_PRI_RSP_SUCCESS - Send SUCCESS back to the device
* - AMD_IOMMU_INV_PRI_RSP_INVALID - Send INVALID back to the device
* - AMD_IOMMU_INV_PRI_RSP_FAIL - Send Failure back to the device,
* the device is required to disable
* PRI when it receives this response
*
* The function returns 0 on success or negative value on error.
*/
#define AMD_IOMMU_INV_PRI_RSP_SUCCESS 0
#define AMD_IOMMU_INV_PRI_RSP_INVALID 1
#define AMD_IOMMU_INV_PRI_RSP_FAIL 2
typedef int (*amd_iommu_invalid_ppr_cb)(struct pci_dev *pdev,
int pasid,
unsigned long address,
u16);
extern int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev,
amd_iommu_invalid_ppr_cb cb);
#else
static inline int amd_iommu_detect(void) { return -ENODEV; }