[PATCH kernel v2 4/4] powerpc/powernv/ioda: Remove obsolete iommu_table_ops::exchange callbacks

[Alexey Kardashevskiy]

As now we have xchg_no_kill/tce_kill, these are not used anymore so
remove them.

Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>
---
 arch/powerpc/include/asm/iommu.h          | 10 -----
 arch/powerpc/kernel/iommu.c               | 26 +-----------
 arch/powerpc/platforms/powernv/pci-ioda.c | 50 -----------------------
 3 files changed, 1 insertion(+), 85 deletions(-)

diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h
index 837b5122f257..350101e11ddb 100644
--- a/arch/powerpc/include/asm/iommu.h
+++ b/arch/powerpc/include/asm/iommu.h
@@ -48,16 +48,6 @@ struct iommu_table_ops {
 	 * returns old TCE and DMA direction mask.
 	 * @tce is a physical address.
 	 */
-	int (*exchange)(struct iommu_table *tbl,
-			long index,
-			unsigned long *hpa,
-			enum dma_data_direction *direction);
-	/* Real mode */
-	int (*exchange_rm)(struct iommu_table *tbl,
-			long index,
-			unsigned long *hpa,
-			enum dma_data_direction *direction);
-
 	int (*xchg_no_kill)(struct iommu_table *tbl,
 			long index,
 			unsigned long *hpa,
diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 070492f9b46e..9704f3f76e63 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -1013,30 +1013,6 @@ int iommu_tce_check_gpa(unsigned long page_shift, unsigned long gpa)
 }
 EXPORT_SYMBOL_GPL(iommu_tce_check_gpa);
 
-long iommu_tce_xchg(struct mm_struct *mm, struct iommu_table *tbl,
-		unsigned long entry, unsigned long *hpa,
-		enum dma_data_direction *direction)
-{
-	long ret;
-	unsigned long size = 0;
-
-	ret = tbl->it_ops->exchange(tbl, entry, hpa, direction);
-
-	if (!ret && ((*direction == DMA_FROM_DEVICE) ||
-			(*direction == DMA_BIDIRECTIONAL)) &&
-			!mm_iommu_is_devmem(mm, *hpa, tbl->it_page_shift,
-					&size))
-		SetPageDirty(pfn_to_page(*hpa >> PAGE_SHIFT));
-
-	/* if (unlikely(ret))
-		pr_err("iommu_tce: %s failed on hwaddr=%lx ioba=%lx kva=%lx ret=%d\n",
-			__func__, hwaddr, entry << tbl->it_page_shift,
-				hwaddr, ret); */
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(iommu_tce_xchg);
-
 extern long iommu_tce_xchg_no_kill(struct mm_struct *mm,
 		struct iommu_table *tbl,
 		unsigned long entry, unsigned long *hpa,
@@ -1076,7 +1052,7 @@ int iommu_take_ownership(struct iommu_table *tbl)
 	 * requires exchange() callback defined so if it is not
 	 * implemented, we disallow taking ownership over the table.
 	 */
-	if (!tbl->it_ops->exchange)
+	if (!tbl->it_ops->xchg_no_kill)
 		return -EINVAL;
 
 	spin_lock_irqsave(&tbl->large_pool.lock, flags);
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 4e56b2c620ec..c28d0d9b7ee0 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1946,28 +1946,6 @@ static int pnv_ioda_tce_xchg_no_kill(struct iommu_table *tbl, long index,
 {
 	return pnv_tce_xchg(tbl, index, hpa, direction, !realmode);
 }
-
-static int pnv_ioda1_tce_xchg(struct iommu_table *tbl, long index,
-		unsigned long *hpa, enum dma_data_direction *direction)
-{
-	long ret = pnv_tce_xchg(tbl, index, hpa, direction, true);
-
-	if (!ret)
-		pnv_pci_p7ioc_tce_invalidate(tbl, index, 1, false);
-
-	return ret;
-}
-
-static int pnv_ioda1_tce_xchg_rm(struct iommu_table *tbl, long index,
-		unsigned long *hpa, enum dma_data_direction *direction)
-{
-	long ret = pnv_tce_xchg(tbl, index, hpa, direction, false);
-
-	if (!ret)
-		pnv_pci_p7ioc_tce_invalidate(tbl, index, 1, true);
-
-	return ret;
-}
 #endif
 
 static void pnv_ioda1_tce_free(struct iommu_table *tbl, long index,
@@ -1981,8 +1959,6 @@ static void pnv_ioda1_tce_free(struct iommu_table *tbl, long index,
 static struct iommu_table_ops pnv_ioda1_iommu_ops = {
 	.set = pnv_ioda1_tce_build,
 #ifdef CONFIG_IOMMU_API
-	.exchange = pnv_ioda1_tce_xchg,
-	.exchange_rm = pnv_ioda1_tce_xchg_rm,
 	.xchg_no_kill = pnv_ioda_tce_xchg_no_kill,
 	.tce_kill = pnv_pci_p7ioc_tce_invalidate,
 	.useraddrptr = pnv_tce_useraddrptr,
@@ -2113,30 +2089,6 @@ static int pnv_ioda2_tce_build(struct iommu_table *tbl, long index,
 	return ret;
 }
 
-#ifdef CONFIG_IOMMU_API
-static int pnv_ioda2_tce_xchg(struct iommu_table *tbl, long index,
-		unsigned long *hpa, enum dma_data_direction *direction)
-{
-	long ret = pnv_tce_xchg(tbl, index, hpa, direction, true);
-
-	if (!ret)
-		pnv_pci_ioda2_tce_invalidate(tbl, index, 1, false);
-
-	return ret;
-}
-
-static int pnv_ioda2_tce_xchg_rm(struct iommu_table *tbl, long index,
-		unsigned long *hpa, enum dma_data_direction *direction)
-{
-	long ret = pnv_tce_xchg(tbl, index, hpa, direction, false);
-
-	if (!ret)
-		pnv_pci_ioda2_tce_invalidate(tbl, index, 1, true);
-
-	return ret;
-}
-#endif
-
 static void pnv_ioda2_tce_free(struct iommu_table *tbl, long index,
 		long npages)
 {
@@ -2148,8 +2100,6 @@ static void pnv_ioda2_tce_free(struct iommu_table *tbl, long index,
 static struct iommu_table_ops pnv_ioda2_iommu_ops = {
 	.set = pnv_ioda2_tce_build,
 #ifdef CONFIG_IOMMU_API
-	.exchange = pnv_ioda2_tce_xchg,
-	.exchange_rm = pnv_ioda2_tce_xchg_rm,
 	.xchg_no_kill = pnv_ioda_tce_xchg_no_kill,
 	.tce_kill = pnv_pci_ioda2_tce_invalidate,
 	.useraddrptr = pnv_tce_useraddrptr,
-- 
2.17.1