target/linux/layerscape/patches-5.4/701-net-0002-soc-fsl-bman-map-FBPR-area-in-the-iommu.patch

   1 From 55705ace9136e1c24d92d7ab23e513439eb766e7 Mon Sep 17 00:00:00 2001
   2 From: Laurentiu Tudor <laurentiu.tudor@nxp.com>
   3 Date: Tue, 3 Apr 2018 17:55:00 +0300
   4 Subject: [PATCH] soc/fsl/bman: map FBPR area in the iommu
   5
   6 Add a one-to-one iommu mapping for bman private data memory (FBPR).
   7 This is required for BMAN to work without faults behind an iommu.
   8
   9 Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
  10 ---
  11  drivers/soc/fsl/qbman/bman_ccsr.c | 11 +++++++++++
  12  1 file changed, 11 insertions(+)
  13
  14 --- a/drivers/soc/fsl/qbman/bman_ccsr.c
  15 +++ b/drivers/soc/fsl/qbman/bman_ccsr.c
  16 @@ -29,6 +29,7 @@
  17   */
  18
  19  #include "bman_priv.h"
  20 +#include <linux/iommu.h>
  21
  22  u16 bman_ip_rev;
  23  EXPORT_SYMBOL(bman_ip_rev);
  24 @@ -210,6 +211,7 @@ static int fsl_bman_probe(struct platfor
  25         int ret, err_irq;
  26         struct device *dev = &pdev->dev;
  27         struct device_node *node = dev->of_node;
  28 +       struct iommu_domain *domain;
  29         struct resource *res;
  30         u16 id, bm_pool_cnt;
  31         u8 major, minor;
  32 @@ -257,6 +259,15 @@ static int fsl_bman_probe(struct platfor
  33
  34         dev_dbg(dev, "Allocated FBPR 0x%llx 0x%zx\n", fbpr_a, fbpr_sz);
  35
  36 +       /* Create an 1-to-1 iommu mapping for FBPR area */
  37 +       domain = iommu_get_domain_for_dev(dev);
  38 +       if (domain) {
  39 +               ret = iommu_map(domain, fbpr_a, fbpr_a, fbpr_sz,
  40 +                               IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE);
  41 +               if (ret)
  42 +                       dev_warn(dev, "failed to iommu_map() %d\n", ret);
  43 +       }
  44 +
  45         bm_set_memory(fbpr_a, fbpr_sz);
  46
  47         err_irq = platform_get_irq(pdev, 0);