iommu/dma-iommu: Remove iommu_dma_map_msi_msg()

A recent change split iommu_dma_map_msi_msg() in two new functions. The
function was still implemented to avoid modifying all the callers at
once.

Now that all the callers have been reworked, iommu_dma_map_msi_msg() can
be removed.
Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

drivers/iommu/dma-iommu.c

@@ -935,23 +935,3 @@ void iommu_dma_compose_msi_msg(struct msi_desc *desc,
 	msg->address_lo &= cookie_msi_granule(domain->iova_cookie) - 1;
 	msg->address_lo += lower_32_bits(msi_page->iova);
 }
-
-void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg)
-{
-	struct msi_desc *desc = irq_get_msi_desc(irq);
-	phys_addr_t msi_addr = (u64)msg->address_hi << 32 | msg->address_lo;
-
-	if (WARN_ON(iommu_dma_prepare_msi(desc, msi_addr))) {
-		/*
-		 * We're called from a void callback, so the best we can do is
-		 * 'fail' by filling the message with obviously bogus values.
-		 * Since we got this far due to an IOMMU being present, it's
-		 * not like the existing address would have worked anyway...
-		 */
-		msg->address_hi = ~0U;
-		msg->address_lo = ~0U;
-		msg->data = ~0U;
-	} else {
-		iommu_dma_compose_msi_msg(desc, msg);
-	}
-}

include/linux/dma-iommu.h

@@ -84,7 +84,6 @@ int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
 void iommu_dma_compose_msi_msg(struct msi_desc *desc,
 			       struct msi_msg *msg);
 
-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);
 
 #else
@@ -124,10 +123,6 @@ static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc,
 {
 }
 
-static inline void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg)
-{
-}
-
 static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
 {
 }