From 55705ace9136e1c24d92d7ab23e513439eb766e7 Mon Sep 17 00:00:00 2001 From: Laurentiu Tudor Date: Tue, 3 Apr 2018 17:55:00 +0300 Subject: [PATCH] soc/fsl/bman: map FBPR area in the iommu Add a one-to-one iommu mapping for bman private data memory (FBPR). This is required for BMAN to work without faults behind an iommu. Signed-off-by: Laurentiu Tudor --- drivers/soc/fsl/qbman/bman_ccsr.c | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/drivers/soc/fsl/qbman/bman_ccsr.c +++ b/drivers/soc/fsl/qbman/bman_ccsr.c @@ -29,6 +29,7 @@ */ #include "bman_priv.h" +#include u16 bman_ip_rev; EXPORT_SYMBOL(bman_ip_rev); @@ -210,6 +211,7 @@ static int fsl_bman_probe(struct platfor int ret, err_irq; struct device *dev = &pdev->dev; struct device_node *node = dev->of_node; + struct iommu_domain *domain; struct resource *res; u16 id, bm_pool_cnt; u8 major, minor; @@ -257,6 +259,15 @@ static int fsl_bman_probe(struct platfor dev_dbg(dev, "Allocated FBPR 0x%llx 0x%zx\n", fbpr_a, fbpr_sz); + /* Create an 1-to-1 iommu mapping for FBPR area */ + domain = iommu_get_domain_for_dev(dev); + if (domain) { + ret = iommu_map(domain, fbpr_a, fbpr_a, fbpr_sz, + IOMMU_READ | IOMMU_WRITE | IOMMU_CACHE); + if (ret) + dev_warn(dev, "failed to iommu_map() %d\n", ret); + } + bm_set_memory(fbpr_a, fbpr_sz); err_irq = platform_get_irq(pdev, 0);