From: Robin Murphy <robin.murphy@arm.com>
Date: Tue, 5 Apr 2016 11:39:30 +0000 (+0100)
Subject: iommu: Add MMIO mapping type
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=31e6850e0fdb3a586363cc4d2f9801cdf9374310;p=linux-beck.git

iommu: Add MMIO mapping type

On some platforms, MMIO regions might need slightly different treatment
compared to mapping regular memory; add the notion of MMIO mappings to
the IOMMU API's memory type flags, so that callers can let the IOMMU
drivers know to do the right thing.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index a5c539fa5d2b..34b643227df1 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -30,6 +30,7 @@
 #define IOMMU_WRITE	(1 << 1)
 #define IOMMU_CACHE	(1 << 2) /* DMA cache coherency */
 #define IOMMU_NOEXEC	(1 << 3)
+#define IOMMU_MMIO	(1 << 4) /* e.g. things like MSI doorbells */
 
 struct iommu_ops;
 struct iommu_group;