dmaengine: idxd: add helper for per interrupt handle drain

mainline inclusion
from mainline-v5.17
commit 46c6df1c
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I596WO
CVE: NA

Intel-SIG: commit 46c6df1c dmaengine: idxd: add helper for per interrupt handle drain.
Incremental backporting patches for DSA/IAA on Intel Xeon platform.

--------------------------------

The helper is called at the completion of the interrupt handle refresh
event. It issues drain descriptors to each of the wq with associated
interrupt handle. The drain descriptor will have interrupt request set but
without completion record. This will ensure all descriptors with incorrect
interrupt completion handle get drained and a completion interrupt is
triggered for the guest driver to process them.
Reviewed-by: NKevin Tian <kevin.tian@intel.com>
Signed-off-by: NDave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/163528418315.3925689.7944718440052849626.stgit@djiang5-desk3.ch.intel.comSigned-off-by: NVinod Koul <vkoul@kernel.org>
Signed-off-by: NXiaochen Shen <xiaochen.shen@intel.com>

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;