diff options
Diffstat (limited to 'drivers/dma/idxd')
| -rw-r--r-- | drivers/dma/idxd/irq.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/dma/idxd/irq.c b/drivers/dma/idxd/irq.c index d9c4fc22536d..5434f702901a 100644 --- a/drivers/dma/idxd/irq.c +++ b/drivers/dma/idxd/irq.c @@ -55,6 +55,45 @@ static void idxd_device_reinit(struct work_struct *work) idxd_device_clear_state(idxd); } +/* + * The function sends a drain descriptor for the interrupt handle. The drain ensures + * all descriptors with this interrupt handle is flushed and the interrupt + * will allow the cleanup of the outstanding descriptors. + */ +static void idxd_int_handle_revoke_drain(struct idxd_irq_entry *ie) +{ + struct idxd_wq *wq = ie->wq; + struct idxd_device *idxd = ie->idxd; + struct device *dev = &idxd->pdev->dev; + struct dsa_hw_desc desc = {}; + void __iomem *portal; + int rc; + + /* Issue a simple drain operation with interrupt but no completion record */ + desc.flags = IDXD_OP_FLAG_RCI; + desc.opcode = DSA_OPCODE_DRAIN; + desc.priv = 1; + + if (ie->pasid != INVALID_IOASID) + desc.pasid = ie->pasid; + desc.int_handle = ie->int_handle; + portal = idxd_wq_portal_addr(wq); + + /* + * The wmb() makes sure that the descriptor is all there before we + * issue. + */ + wmb(); + if (wq_dedicated(wq)) { + iosubmit_cmds512(portal, &desc, 1); + } else { + rc = enqcmds(portal, &desc); + /* This should not fail unless hardware failed. */ + if (rc < 0) + dev_warn(dev, "Failed to submit drain desc on wq %d\n", wq->id); + } +} + static int process_misc_interrupts(struct idxd_device *idxd, u32 cause) { struct device *dev = &idxd->pdev->dev; |