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Message-Id: <1457404974-1800-2-git-send-email-niklas.soderlund+renesas@ragnatech.se>
Date: Tue, 8 Mar 2016 03:42:46 +0100
From: Niklas Söderlund
<niklas.soderlund+renesas@...natech.se>
To: vinod.koul@...el.com, linux-renesas-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
dmaengine@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc: robin.murphy@....com, laurent.pinchart@...asonboard.com,
geert+renesas@...der.be, linus.walleij@...aro.org,
dan.j.williams@...el.com, arnd@...db.de,
linux-arch@...r.kernel.org,
Niklas Söderlund
<niklas.soderlund+renesas@...natech.se>
Subject: [PATCH v5 1/9] iommu: Add MMIO mapping type
From: Robin Murphy <robin.murphy@....com>
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@....com>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
---
drivers/iommu/io-pgtable-arm.c | 9 +++++++--
include/linux/iommu.h | 1 +
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index 381ca5a..9c19989 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -355,7 +355,10 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
pte |= ARM_LPAE_PTE_AP_RDONLY;
- if (prot & IOMMU_CACHE)
+ if (prot & IOMMU_MMIO)
+ pte |= (ARM_LPAE_MAIR_ATTR_IDX_DEV
+ << ARM_LPAE_PTE_ATTRINDX_SHIFT);
+ else if (prot & IOMMU_CACHE)
pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE
<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
} else {
@@ -364,7 +367,9 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
pte |= ARM_LPAE_PTE_HAP_READ;
if (prot & IOMMU_WRITE)
pte |= ARM_LPAE_PTE_HAP_WRITE;
- if (prot & IOMMU_CACHE)
+ if (prot & IOMMU_MMIO)
+ pte |= ARM_LPAE_PTE_MEMATTR_DEV;
+ else if (prot & IOMMU_CACHE)
pte |= ARM_LPAE_PTE_MEMATTR_OIWB;
else
pte |= ARM_LPAE_PTE_MEMATTR_NC;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index a5c539f..34b6432 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;
--
2.7.2
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