linux-kernel - [PATCH 3/4 v4] iommu/fsl: Add iommu domain attributes required by fsl PAMU driver.

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Date:	Mon, 5 Nov 2012 16:49:20 +0530
From:	Varun Sethi <Varun.Sethi@...escale.com>
To:	<joerg.roedel@....com>, <iommu@...ts.linux-foundation.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	<timur@...escale.com>, <scottwood@...escale.com>
CC:	Varun Sethi <Varun.Sethi@...escale.com>
Subject: [PATCH 3/4 v4] iommu/fsl: Add iommu domain attributes required by fsl PAMU driver.

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


Signed-off-by: Varun Sethi <Varun.Sethi@...escale.com>
---
changes in v4:
- Updated comment explaining subwindows(as mentioned by Scott).
change in v3:
-renamed the stash attribute targets
 include/linux/iommu.h |   36 ++++++++++++++++++++++++++++++++++++
 1 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index f3b99e1..e72f5e5 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -44,6 +44,34 @@ struct iommu_domain_geometry {
 	dma_addr_t aperture_start; /* First address that can be mapped    */
 	dma_addr_t aperture_end;   /* Last address that can be mapped     */
 	bool force_aperture;       /* DMA only allowed in mappable range? */
+
+	/**
+	 * There could be a single contiguous window tha maps the entire
+	 * geometry or it could be split in to multiple subwindows.
+	 * Subwindows allow for supporting physically discontiguous mappings.
+	 * This attribute indicates number of DMA subwindows supported by
+	 * the geometry. If there is a single window that maps the entire
+	 * geometry, attribute must be set to "1". A value of "0" implies
+	 * that there are 256 subwindows each of size 4K. Value other than
+	 * "0" or "1" indicates the actual number of subwindows.
+	 */
+	u32 subwindows;
+};
+
+/* cache stash targets */
+#define IOMMU_ATTR_CACHE_L1 1
+#define IOMMU_ATTR_CACHE_L2 2
+#define IOMMU_ATTR_CACHE_L3 3
+
+/* This attribute corresponds to IOMMUs capable of generating
+ * a stash transaction. A stash transaction is typically a
+ * hardware initiated prefetch of data from memory to cache.
+ * This attribute allows configuring stashig specific parameters
+ * in the IOMMU hardware.
+ */
+struct iommu_stash_attribute {
+	u32 	cpu;	/* cpu number */
+	u32 	cache;	/* cache to stash to: L1,L2,L3 */
 };
 
 struct iommu_domain {
@@ -60,6 +88,14 @@ struct iommu_domain {
 enum iommu_attr {
 	DOMAIN_ATTR_MAX,
 	DOMAIN_ATTR_GEOMETRY,
+	/* Set the IOMMU hardware stashing
+	 * parameters.
+	 */
+	DOMAIN_ATTR_STASH,
+	/* Explicity enable/disable DMA for a
+         * particular memory window.
+         */
+	DOMAIN_ATTR_ENABLE,
 };
 
 #ifdef CONFIG_IOMMU_API
-- 
1.7.4.1


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