[PATCH v7 4/5] iommu/dma: Add a helper function to reserve HW MSI address regions for IOMMU drivers
Shameer Kolothum
shameerali.kolothum.thodi at huawei.com
Thu Sep 14 05:57:55 PDT 2017
IOMMU drivers can use this to implement their .get_resv_regions callback
for HW MSI specific reservations(e.g. ARM GICv3 ITS MSI region).
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi at huawei.com>
[John: added DT support]
Signed-off-by: John Garry <john.garry at huawei.com>
---
drivers/iommu/dma-iommu.c | 19 +++++++++++++++++++
include/linux/dma-iommu.h | 7 +++++++
2 files changed, 26 insertions(+)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 9d1cebe..f8709a2 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -19,6 +19,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#include <linux/acpi_iort.h>
#include <linux/device.h>
#include <linux/dma-iommu.h>
#include <linux/gfp.h>
@@ -27,6 +28,7 @@
#include <linux/iova.h>
#include <linux/irq.h>
#include <linux/mm.h>
+#include <linux/of_iommu.h>
#include <linux/pci.h>
#include <linux/scatterlist.h>
#include <linux/vmalloc.h>
@@ -198,6 +200,23 @@ void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
}
EXPORT_SYMBOL(iommu_dma_get_resv_regions);
+/**
+ * iommu_dma_get_msi_resv_regions - Reserved region driver helper
+ * @dev: Device from iommu_get_resv_regions()
+ * @list: Reserved region list from iommu_get_resv_regions()
+ *
+ * IOMMU drivers can use this to implement their .get_resv_regions
+ * callback for HW MSI specific reservations.
+ */
+int iommu_dma_get_msi_resv_regions(struct device *dev, struct list_head *list)
+{
+ if (is_of_node(dev->iommu_fwspec->iommu_fwnode))
+ return of_iommu_msi_get_resv_regions(dev, list);
+
+ return iort_iommu_msi_get_resv_regions(dev, list);
+}
+EXPORT_SYMBOL(iommu_dma_get_msi_resv_regions);
+
static int cookie_init_hw_msi_region(struct iommu_dma_cookie *cookie,
phys_addr_t start, phys_addr_t end)
{
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 92f2083..6062ef0 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -74,6 +74,8 @@ void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg);
void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
+int iommu_dma_get_msi_resv_regions(struct device *dev, struct list_head *list);
+
#else
struct iommu_domain;
@@ -107,6 +109,11 @@ static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_he
{
}
+static inline int iommu_dma_get_msi_resv_regions(struct device *dev, struct list_head *list)
+{
+ return -ENODEV;
+}
+
#endif /* CONFIG_IOMMU_DMA */
#endif /* __KERNEL__ */
#endif /* __DMA_IOMMU_H */
--
1.9.1
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