target/linux/layerscape/patches-5.4/701-net-0004-soc-fsl-qman-portal-map-CENA-area-in-the-iommu.patch

   1 From 488b62aa444440690708e5ea823bb0d54c296c4f Mon Sep 17 00:00:00 2001
   2 From: Laurentiu Tudor <laurentiu.tudor@nxp.com>
   3 Date: Tue, 3 Apr 2018 18:18:30 +0300
   4 Subject: [PATCH] soc/fsl/qman-portal: map CENA area in the iommu
   5
   6 Add a one-to-one iommu mapping for qman portal CENA register area.
   7 This is required for QMAN stashing to work without faults behind
   8 an iommu.
   9
  10 Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
  11 ---
  12  drivers/soc/fsl/qbman/qman_portal.c | 17 +++++++++++++++++
  13  1 file changed, 17 insertions(+)
  14
  15 --- a/drivers/soc/fsl/qbman/qman_portal.c
  16 +++ b/drivers/soc/fsl/qbman/qman_portal.c
  17 @@ -29,6 +29,7 @@
  18   */
  19
  20  #include "qman_priv.h"
  21 +#include <linux/iommu.h>
  22
  23  struct qman_portal *qman_dma_portal;
  24  EXPORT_SYMBOL(qman_dma_portal);
  25 @@ -231,6 +232,7 @@ static int qman_portal_probe(struct plat
  26  {
  27         struct device *dev = &pdev->dev;
  28         struct device_node *node = dev->of_node;
  29 +       struct iommu_domain *domain;
  30         struct qm_portal_config *pcfg;
  31         struct resource *addr_phys[2];
  32         int irq, cpu, err, i;
  33 @@ -294,6 +296,21 @@ static int qman_portal_probe(struct plat
  34                 goto err_ioremap2;
  35         }
  36
  37 +       /* Create an 1-to-1 iommu mapping for cena portal area */
  38 +       domain = iommu_get_domain_for_dev(dev);
  39 +       if (domain) {
  40 +               /*
  41 +                * Note: not mapping this as cacheable triggers the infamous
  42 +                * QMan CIDE error.
  43 +                */
  44 +               err = iommu_map(domain,
  45 +                               addr_phys[0]->start, addr_phys[0]->start,
  46 +                               resource_size(addr_phys[0]),
  47 +                               IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE);
  48 +               if (err)
  49 +                       dev_warn(dev, "failed to iommu_map() %d\n", err);
  50 +       }
  51 +
  52         pcfg->pools = qm_get_pools_sdqcr();
  53
  54         spin_lock(&qman_lock);