From: Laurentiu Tudor <laurentiu.tudor@xxxxxxx>
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@xxxxxxx>
---
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 05c42235dd41..d180da003e4a 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);
@@ -171,6 +172,7 @@ 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;
@@ -216,6 +218,15 @@ 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
