[PATCH 02/13] soc/fsl/bman: map FBPR area in the iommu
From: laurentiu.tudor@nxp.com
Date: 2019-03-29 14:01:52
Also in:
linux-arm-kernel, linux-iommu, 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 bman private data memory (FBPR). This is required for BMAN to work without faults behind an iommu. Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> --- drivers/soc/fsl/qbman/bman_ccsr.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/soc/fsl/qbman/bman_ccsr.c b/drivers/soc/fsl/qbman/bman_ccsr.c
index 7c3cc968053c..b209c79511bb 100644
--- 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 <linux/iommu.h> u16 bman_ip_rev; EXPORT_SYMBOL(bman_ip_rev);
@@ -178,6 +179,7 @@ static int fsl_bman_probe(struct platform_device *pdev) 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;
@@ -225,6 +227,15 @@ static int fsl_bman_probe(struct platform_device *pdev) 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);
--
2.17.1