From: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>
Clarify runtime memory bank detection in the IPMMU driver.
Not-Yet-Signed-off-by: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>
---
drivers/iommu/ipmmu-vmsa.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- 0002/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c 2019-02-20 23:09:46.212274343 +0900
@@ -1095,6 +1095,14 @@ static int ipmmu_probe(struct platform_d
dev_info(&pdev->dev, "IPMMU context 0 is reserved\n");
set_bit(0, mmu->ctx);
}
+
+ if (memblock_end_of_DRAM() <= SZ_4G) {
+ dev_info(&pdev->dev, "All system memory located within 32 bits of physical address space.\n");
+ dev_info(&pdev->dev, "IPMMU address translation not needed.\n");
+ } else {
+ dev_info(&pdev->dev, "System memory detected outside 32 bits of physical address space.\n");
+ dev_info(&pdev->dev, "IPMMU address translation may be required.\n");
+ }
}
/*
