[PATCH 5/9 v2] pci/msi: interface to set an iova for a msi region

[Bharat Bhushan <r65777@freescale.com>]

This patch defines an interface by which a msi page
can be mapped to a specific iova page.

This is a requirement in aperture type of IOMMUs (like Freescale PAMU),
where we map msi iova page just after guest memory iova address.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
---
v2
 - new patch

 drivers/pci/msi.c   |   13 +++++++++++++
 include/linux/pci.h |    8 ++++++++
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 2643a29..040609f 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -77,6 +77,19 @@ int __weak arch_msi_get_region(int region_num, struct msi_region *region)
 	return 0;
 }
 
+int __weak arch_msi_set_iova(struct pci_dev *pdev, int region_num,
+			     dma_addr_t iova, bool set)
+{
+	return 0;
+}
+
+int msi_set_iova(struct pci_dev *pdev, int region_num,
+		 dma_addr_t iova, bool set)
+{
+	return arch_msi_set_iova(pdev, region_num, iova, set);
+}
+EXPORT_SYMBOL(msi_set_iova);
+
 int msi_get_region_count(void)
 {
 	return arch_msi_get_region_count();
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c587034..c6d3e58 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1195,6 +1195,12 @@ static inline int msi_get_region(int region_num, struct msi_region *region)
 {
 	return 0;
 }
+
+static inline int msi_set_iova(struct pci_dev *pdev, int region_num,
+			       dma_addr_t iova, bool set)
+{
+	return 0;
+}
 #else
 int pci_enable_msi_block(struct pci_dev *dev, unsigned int nvec);
 int pci_enable_msi_block_auto(struct pci_dev *dev, unsigned int *maxvec);
@@ -1209,6 +1215,8 @@ void pci_restore_msi_state(struct pci_dev *dev);
 int pci_msi_enabled(void);
 int msi_get_region_count(void);
 int msi_get_region(int region_num, struct msi_region *region);
+int msi_set_iova(struct pci_dev *pdev, int region_num,
+		 dma_addr_t iova, bool set);
 #endif
 
 #ifdef CONFIG_PCIEPORTBUS
-- 
1.7.0.4