[PATCH v2 04/22] soc/fsl/qman-portal: map CENA area in the iommu
From: laurentiu.tudor@nxp.com (laurentiu.tudor at nxp.com)
Date: 2018-09-26 13:25:36
Also in:
linux-devicetree, lkml, netdev
Subsystem:
freescale soc drivers, the rest · Maintainers:
Christophe Leroy, Linus Torvalds
From: Laurentiu Tudor <laurentiu.tudor@nxp.com> Add a one-to-one iommu mapping for qman portal CENA register area. This is required for QMAN stashing to work without faults behind an iommu. Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> --- drivers/soc/fsl/qbman/qman_portal.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/drivers/soc/fsl/qbman/qman_portal.c b/drivers/soc/fsl/qbman/qman_portal.c
index a120002b630e..6d9da3b1b5ad 100644
--- a/drivers/soc/fsl/qbman/qman_portal.c
+++ b/drivers/soc/fsl/qbman/qman_portal.c@@ -29,6 +29,7 @@ */ #include "qman_priv.h" +#include <linux/iommu.h> struct qman_portal *qman_dma_portal; EXPORT_SYMBOL(qman_dma_portal);
@@ -222,6 +223,7 @@ static int qman_portal_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *node = dev->of_node; + struct iommu_domain *domain; struct qm_portal_config *pcfg; struct resource *addr_phys[2]; int irq, cpu, err;
@@ -276,6 +278,21 @@ static int qman_portal_probe(struct platform_device *pdev) goto err_ioremap2; } + /* Create an 1-to-1 iommu mapping for cena portal area */ + domain = iommu_get_domain_for_dev(dev); + if (domain) { + /* + * Note: not mapping this as cacheable triggers the infamous + * QMan CIDE error. + */ + err = iommu_map(domain, + addr_phys[0]->start, addr_phys[0]->start, + resource_size(addr_phys[0]), + IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE); + if (err) + dev_warn(dev, "failed to iommu_map() %d\n", err); + } + pcfg->pools = qm_get_pools_sdqcr(); spin_lock(&qman_lock);
--
2.17.1