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Subject[PATCH 22/22] iommu/amd: Add invalid_ppr callback
Date
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>
---
drivers/iommu/amd_iommu_v2.c | 57 ++++++++++++++++++++++++++++++++++++++++-
include/linux/amd-iommu.h | 34 ++++++++++++++++++++++--
2 files changed, 86 insertions(+), 5 deletions(-)
diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index ffe85e0..7f63a4d 100644
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -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;
};
@@ -504,10 +505,31 @@ 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);

@@ -820,6 +842,37 @@ 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;
diff --git a/include/linux/amd-iommu.h b/include/linux/amd-iommu.h
index 23e21e1..06688c4 100644
--- a/include/linux/amd-iommu.h
+++ b/include/linux/amd-iommu.h
@@ -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; }
--
1.7.5.4



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