target/linux/layerscape/patches-5.4/701-net-0003-soc-fsl-qman-map-FQD-and-PFDR-areas-in-the-iommu.patch

From 02638b2627104cd02aff7484bb250d029e05dc5f Mon Sep 17 00:00:00 2001
From: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Date: Tue, 3 Apr 2018 18:08:48 +0300
Subject: [PATCH] soc/fsl/qman: map FQD and PFDR areas in the iommu

Add a one-to-one iommu mapping for qman private data memory areas
(FQD and PFDR). This is required for QMAN to work without faults
behind an iommu.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
---
 drivers/soc/fsl/qbman/qman_ccsr.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- a/drivers/soc/fsl/qbman/qman_ccsr.c
+++ b/drivers/soc/fsl/qbman/qman_ccsr.c
@@ -29,6 +29,7 @@
  */
 
 #include "qman_priv.h"
+#include <linux/iommu.h>
 
 u16 qman_ip_rev;
 EXPORT_SYMBOL(qman_ip_rev);
@@ -755,6 +756,7 @@ static int fsl_qman_probe(struct platfor
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *node = dev->of_node;
+	struct iommu_domain *domain;
 	struct resource *res;
 	int ret, err_irq;
 	u16 id;
@@ -834,6 +836,19 @@ static int fsl_qman_probe(struct platfor
 	}
 	dev_dbg(dev, "Allocated PFDR 0x%llx 0x%zx\n", pfdr_a, pfdr_sz);
 
+	/* Create an 1-to-1 iommu mapping for fqd and pfdr areas */
+	domain = iommu_get_domain_for_dev(dev);
+	if (domain) {
+		ret = iommu_map(domain, fqd_a, fqd_a, fqd_sz,
+				IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE);
+		if (ret)
+			dev_warn(dev, "iommu_map(fqd) failed %d\n", ret);
+		ret = iommu_map(domain, pfdr_a, pfdr_a, pfdr_sz,
+				IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE);
+		if (ret)
+			dev_warn(dev, "iommu_map(pfdr) failed %d\n", ret);
+	}
+
 	ret = qman_init_ccsr(dev);
 	if (ret) {
 		dev_err(dev, "CCSR setup failed\n");