linux-kernel - [PATCH 2/3 v12] iommu/fsl: Add additional iommu attributes required by the PAMU driver.

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Message-ID: <1365966722-1804-2-git-send-email-Varun.Sethi@freescale.com>
Date:	Mon, 15 Apr 2013 00:42:01 +0530
From:	Varun Sethi <Varun.Sethi@...escale.com>
To:	<joro@...tes.org>, <stuart.yoder@...escale.com>,
	<scottwood@...escale.com>, <iommu@...ts.linux-foundation.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	<galak@...nel.crashing.org>, <benh@...nel.crashing.org>
CC:	Varun Sethi <Varun.Sethi@...escale.com>
Subject: [PATCH 2/3 v12] iommu/fsl: Add additional iommu attributes required by the PAMU driver.

Added the following domain attributes for the FSL PAMU driver:
1. Added new iommu stash attribute, which allows setting of the
   LIODN specific stash id parameter through IOMMU API.
2. Added an attribute for enabling/disabling DMA to a particular
   memory window.
3. Added domain attribute to check for PAMUV1 specific constraints.

Signed-off-by: Varun Sethi <Varun.Sethi@...escale.com>
---
-v12 changes:
- Moved PAMU specifc stash ids and structures to PAMU header file.
- no change in v11.
- no change in v10.
 include/linux/iommu.h |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 2727810..c5dc2b9 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -57,10 +57,26 @@ struct iommu_domain {
 #define IOMMU_CAP_CACHE_COHERENCY	0x1
 #define IOMMU_CAP_INTR_REMAP		0x2	/* isolates device intrs */
 
+/*
+ * Following constraints are specifc to PAMUV1:
+ *  -aperture must be power of 2, and naturally aligned
+ *  -number of windows must be power of 2, and address space size
+ *   of each window is determined by aperture size / # of windows
+ *  -the actual size of the mapped region of a window must be power
+ *   of 2 starting with 4KB and physical address must be naturally
+ *   aligned.
+ * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
+ * The caller can invoke iommu_domain_get_attr to check if the underlying
+ * iommu implementation supports these constraints.
+ */
+
 enum iommu_attr {
 	DOMAIN_ATTR_GEOMETRY,
 	DOMAIN_ATTR_PAGING,
 	DOMAIN_ATTR_WINDOWS,
+	DOMAIN_ATTR_PAMU_STASH,
+	DOMAIN_ATTR_PAMU_ENABLE,
+	DOMAIN_ATTR_FSL_PAMUV1,
 	DOMAIN_ATTR_MAX,
 };
 
-- 
1.7.4.1


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