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From: Boris Brezillon <boris.brezillon@collabora.com>
To: Joerg Roedel <joro@8bytes.org>,
	iommu@lists.linux-foundation.org,
	Rob Herring <robh+dt@kernel.org>,
	Tomeu Vizoso <tomeu.vizoso@collabora.com>,
	Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
	Steven Price <steven.price@arm.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Cc: Boris Brezillon <boris.brezillon@collabora.com>,
	dri-devel@lists.freedesktop.org
Subject: [PATCH v2 1/5] [RFC]iommu: Add a IOMMU_DEVONLY protection flag
Date: Fri,  1 Oct 2021 16:34:23 +0200	[thread overview]
Message-ID: <20211001143427.1564786-2-boris.brezillon@collabora.com> (raw)
In-Reply-To: <20211001143427.1564786-1-boris.brezillon@collabora.com>

The IOMMU_DEVONLY flag allows the caller to flag a mappings backed by
device-private buffers. That means other devices or CPUs are not
expected to access the physical memory region pointed by the mapping,
and the MMU driver can safely restrict the shareability domain to the
device itself.

Will be used by the ARM MMU driver to flag Mali mappings accessed only
by the GPU as Inner-shareable.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
 include/linux/iommu.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d2f3435e7d17..db14781b522f 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -31,6 +31,13 @@
  * if the IOMMU page table format is equivalent.
  */
 #define IOMMU_PRIV	(1 << 5)
+/*
+ * Mapping is only accessed by the device behind the iommu. That means other
+ * devices or CPUs are not expected to access this physical memory region,
+ * and the MMU driver can safely restrict the shareability domain to the
+ * device itself.
+ */
+#define IOMMU_DEVONLY	(1 << 6)
 
 struct iommu_ops;
 struct iommu_group;
-- 
2.31.1

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

WARNING: multiple messages have this Message-ID (diff)
From: Boris Brezillon <boris.brezillon@collabora.com>
To: Joerg Roedel <joro@8bytes.org>,
	iommu@lists.linux-foundation.org,
	Rob Herring <robh+dt@kernel.org>,
	Tomeu Vizoso <tomeu.vizoso@collabora.com>,
	Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
	Steven Price <steven.price@arm.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Cc: dri-devel@lists.freedesktop.org,
	Boris Brezillon <boris.brezillon@collabora.com>
Subject: [PATCH v2 1/5] [RFC]iommu: Add a IOMMU_DEVONLY protection flag
Date: Fri,  1 Oct 2021 16:34:23 +0200	[thread overview]
Message-ID: <20211001143427.1564786-2-boris.brezillon@collabora.com> (raw)
In-Reply-To: <20211001143427.1564786-1-boris.brezillon@collabora.com>

The IOMMU_DEVONLY flag allows the caller to flag a mappings backed by
device-private buffers. That means other devices or CPUs are not
expected to access the physical memory region pointed by the mapping,
and the MMU driver can safely restrict the shareability domain to the
device itself.

Will be used by the ARM MMU driver to flag Mali mappings accessed only
by the GPU as Inner-shareable.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
 include/linux/iommu.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d2f3435e7d17..db14781b522f 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -31,6 +31,13 @@
  * if the IOMMU page table format is equivalent.
  */
 #define IOMMU_PRIV	(1 << 5)
+/*
+ * Mapping is only accessed by the device behind the iommu. That means other
+ * devices or CPUs are not expected to access this physical memory region,
+ * and the MMU driver can safely restrict the shareability domain to the
+ * device itself.
+ */
+#define IOMMU_DEVONLY	(1 << 6)
 
 struct iommu_ops;
 struct iommu_group;
-- 
2.31.1


WARNING: multiple messages have this Message-ID (diff)
From: Boris Brezillon <boris.brezillon@collabora.com>
To: Joerg Roedel <joro@8bytes.org>,
	iommu@lists.linux-foundation.org,
	Rob Herring <robh+dt@kernel.org>,
	Tomeu Vizoso <tomeu.vizoso@collabora.com>,
	Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
	Steven Price <steven.price@arm.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Cc: dri-devel@lists.freedesktop.org,
	Boris Brezillon <boris.brezillon@collabora.com>
Subject: [PATCH v2 1/5] [RFC]iommu: Add a IOMMU_DEVONLY protection flag
Date: Fri,  1 Oct 2021 16:34:23 +0200	[thread overview]
Message-ID: <20211001143427.1564786-2-boris.brezillon@collabora.com> (raw)
In-Reply-To: <20211001143427.1564786-1-boris.brezillon@collabora.com>

The IOMMU_DEVONLY flag allows the caller to flag a mappings backed by
device-private buffers. That means other devices or CPUs are not
expected to access the physical memory region pointed by the mapping,
and the MMU driver can safely restrict the shareability domain to the
device itself.

Will be used by the ARM MMU driver to flag Mali mappings accessed only
by the GPU as Inner-shareable.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
 include/linux/iommu.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d2f3435e7d17..db14781b522f 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -31,6 +31,13 @@
  * if the IOMMU page table format is equivalent.
  */
 #define IOMMU_PRIV	(1 << 5)
+/*
+ * Mapping is only accessed by the device behind the iommu. That means other
+ * devices or CPUs are not expected to access this physical memory region,
+ * and the MMU driver can safely restrict the shareability domain to the
+ * device itself.
+ */
+#define IOMMU_DEVONLY	(1 << 6)
 
 struct iommu_ops;
 struct iommu_group;
-- 
2.31.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-10-01 14:34 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-01 14:34 [PATCH v2 0/5] drm/panfrost: Add extra GPU-usage flags Boris Brezillon
2021-10-01 14:34 ` Boris Brezillon
2021-10-01 14:34 ` Boris Brezillon
2021-10-01 14:34 ` Boris Brezillon [this message]
2021-10-01 14:34   ` [PATCH v2 1/5] [RFC]iommu: Add a IOMMU_DEVONLY protection flag Boris Brezillon
2021-10-01 14:34   ` Boris Brezillon
2021-10-01 17:31   ` Alyssa Rosenzweig
2021-10-01 17:31     ` Alyssa Rosenzweig
2021-10-01 17:31     ` Alyssa Rosenzweig
2021-10-18 10:25   ` Joerg Roedel
2021-10-18 10:25     ` Joerg Roedel
2021-10-18 10:25     ` Joerg Roedel
2021-10-18 12:03     ` Boris Brezillon
2021-10-18 12:03       ` Boris Brezillon
2021-10-18 12:03       ` Boris Brezillon
2021-10-01 14:34 ` [PATCH v2 2/5] [RFC]iommu/io-pgtable-arm: Take the DEVONLY flag into account on ARM_MALI_LPAE Boris Brezillon
2021-10-01 14:34   ` Boris Brezillon
2021-10-01 14:34   ` Boris Brezillon
2021-10-01 14:34 ` [PATCH v2 3/5] drm/panfrost: Add PANFROST_BO_NO{READ,WRITE} flags Boris Brezillon
2021-10-01 14:34   ` Boris Brezillon
2021-10-01 14:34   ` Boris Brezillon
2021-10-01 14:36   ` Boris Brezillon
2021-10-01 14:36     ` Boris Brezillon
2021-10-01 14:36     ` Boris Brezillon
2021-10-01 14:34 ` [PATCH v2 4/5] drm/panfrost: Add a PANFROST_BO_GPUONLY flag Boris Brezillon
2021-10-01 14:34   ` Boris Brezillon
2021-10-01 14:34   ` Boris Brezillon
2021-10-01 15:13   ` Steven Price
2021-10-01 15:13     ` Steven Price
2021-10-01 15:13     ` Steven Price
2021-10-01 16:22     ` Boris Brezillon
2021-10-01 16:22       ` Boris Brezillon
2021-10-01 16:22       ` Boris Brezillon
2021-10-01 17:30       ` Alyssa Rosenzweig
2021-10-01 17:30         ` Alyssa Rosenzweig
2021-10-01 17:30         ` Alyssa Rosenzweig
2021-10-01 14:34 ` [PATCH v2 5/5] drm/panfrost: Bump the driver version to 1.3 Boris Brezillon
2021-10-01 14:34   ` Boris Brezillon
2021-10-01 14:34   ` Boris Brezillon

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