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Subject[PATCH 2/6] iommu/amd: Implement DOMAIN_ATTR_GEOMETRY attribute
Date
Implement the attribute itself and add the code for the
AMD IOMMU driver.

Signed-off-by: Joerg Roedel <joerg.roedel@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 f75e060..aa90be3 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3033,6 +3033,10 @@ 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 ef54718..3d0b0bf 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -345,10 +345,23 @@ 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 8b66e84..ba77bf9 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -37,16 +37,24 @@ struct iommu_domain;
typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
struct device *, unsigned long, int);

+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;
+ struct iommu_domain_geometry geometry;
};

#define IOMMU_CAP_CACHE_COHERENCY 0x1
#define IOMMU_CAP_INTR_REMAP 0x2 /* isolates device intrs */

enum iommu_attr {
+ DOMAIN_ATTR_GEOMETRY, /* struct iommu_domain_geometry */
DOMAIN_ATTR_MAX,
};

--
1.7.5.4



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