[PATCH 2/7] iommu/amd: Implement DOMAIN_ATTR_GEOMETRY attribute

[Joerg Roedel]

Implement the attribute itself and add the code for the
AMD IOMMU driver.

Signed-off-by: Joerg Roedel <joerg.roe...@amd.com>
---
 drivers/iommu/amd_iommu.c |    4 ++++
 drivers/iommu/iommu.c     |   19 ++++++++++++++++---
 include/linux/iommu.h     |    8 ++++++++
 3 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index a2e418c..259a6be 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3069,6 +3069,10 @@ static int amd_iommu_domain_init(struct iommu_domain 
*dom)
 
        dom->priv = domain;
 
+       dom->geometry.aperture_start = 0;
+       dom->geometry.aperture_end   = ~0ULL;
+       dom->geometry.force_aperture = true;
+
        return 0;
 
 out_free:
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index c39972d..ed5e0a5 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -348,10 +348,23 @@ EXPORT_SYMBOL_GPL(iommu_device_group);
 int iommu_domain_get_attr(struct iommu_domain *domain,
                          enum iommu_attr attr, void *data)
 {
-       if (!domain->ops->domain_get_attr)
-               return -EINVAL;
+       struct iommu_domain_geometry *geometry;
+       int ret = 0;
+
+       switch (attr) {
+       case DOMAIN_ATTR_GEOMETRY:
+               geometry  = data;
+               *geometry = domain->geometry;
+
+               break;
+       default:
+               if (!domain->ops->domain_get_attr)
+                       return -EINVAL;
 
-       return domain->ops->domain_get_attr(domain, attr, data);
+               ret = domain->ops->domain_get_attr(domain, attr, data);
+       }
+
+       return ret;
 }
 EXPORT_SYMBOL_GPL(iommu_domain_get_attr);
 
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 0eef096..f7df4aa 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -37,11 +37,18 @@ struct iommu_domain;
 typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
                        struct device *, unsigned long, int, void *);
 
+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? */
+};
+
 struct iommu_domain {
        struct iommu_ops *ops;
        void *priv;
        iommu_fault_handler_t handler;
        void *handler_token;
+       struct iommu_domain_geometry geometry;
 };
 
 #define IOMMU_CAP_CACHE_COHERENCY      0x1
@@ -49,6 +56,7 @@ struct iommu_domain {
 
 enum iommu_attr {
        DOMAIN_ATTR_MAX,
+       DOMAIN_ATTR_GEOMETRY,
 };
 
 #ifdef CONFIG_IOMMU_API
-- 
1.7.9.5


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