powerpc/iommu: Move tce_xxx callbacks from ppc_md to iommu_table

This adds a iommu_table_ops struct and puts pointer to it into
the iommu_table struct. This moves tce_build/tce_free/tce_get/tce_flush
callbacks from ppc_md to the new struct where they really belong to.

This adds the requirement for @it_ops to be initialized before calling
iommu_init_table() to make sure that we do not leave any IOMMU table
with iommu_table_ops uninitialized. This is not a parameter of
iommu_init_table() though as there will be cases when iommu_init_table()
will not be called on TCE tables, for example - VFIO.

This does s/tce_build/set/, s/tce_free/clear/ and removes "tce_"
redundant prefixes.

This removes tce_xxx_rm handlers from ppc_md but does not add
them to iommu_table_ops as this will be done later if we decide to
support TCE hypercalls in real mode. This removes _vm callbacks as
only virtual mode is supported by now so this also removes @rm parameter.

For pSeries, this always uses tce_buildmulti_pSeriesLP/
tce_buildmulti_pSeriesLP. This changes multi callback to fall back to
tce_build_pSeriesLP/tce_free_pSeriesLP if FW_FEATURE_MULTITCE is not
present. The reason for this is we still have to support "multitce=off"
boot parameter in disable_multitce() and we do not want to walk through
all IOMMU tables in the system and replace "multi" callbacks with single
ones.

For powernv, this defines _ops per PHB type which are P5IOC2/IODA1/IODA2.
This makes the callbacks for them public. Later patches will extend
callbacks for IODA1/2.

No change in behaviour is expected.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 24 insertions, 22 deletions

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index ac2f959adf9a..c0e67e945c95 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -322,11 +322,11 @@ static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
 	ret = entry << tbl->it_page_shift;	/* Set the return dma address */
 
 	/* Put the TCEs in the HW table */
-	build_fail = ppc_md.tce_build(tbl, entry, npages,
+	build_fail = tbl->it_ops->set(tbl, entry, npages,
 				      (unsigned long)page &
 				      IOMMU_PAGE_MASK(tbl), direction, attrs);
 
-	/* ppc_md.tce_build() only returns non-zero for transient errors.
+	/* tbl->it_ops->set() only returns non-zero for transient errors.
 	 * Clean up the table bitmap in this case and return
 	 * DMA_ERROR_CODE. For all other errors the functionality is
 	 * not altered.
@@ -337,8 +337,8 @@ static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
 	}
 
 	/* Flush/invalidate TLB caches if necessary */
-	if (ppc_md.tce_flush)
-		ppc_md.tce_flush(tbl);
+	if (tbl->it_ops->flush)
+		tbl->it_ops->flush(tbl);
 
 	/* Make sure updates are seen by hardware */
 	mb();
@@ -408,7 +408,7 @@ static void __iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
 	if (!iommu_free_check(tbl, dma_addr, npages))
 		return;
 
-	ppc_md.tce_free(tbl, entry, npages);
+	tbl->it_ops->clear(tbl, entry, npages);
 
 	spin_lock_irqsave(&(pool->lock), flags);
 	bitmap_clear(tbl->it_map, free_entry, npages);
@@ -424,8 +424,8 @@ static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
 	 * not do an mb() here on purpose, it is not needed on any of
 	 * the current platforms.
 	 */
-	if (ppc_md.tce_flush)
-		ppc_md.tce_flush(tbl);
+	if (tbl->it_ops->flush)
+		tbl->it_ops->flush(tbl);
 }
 
 int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
@@ -495,7 +495,7 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
 			    npages, entry, dma_addr);
 
 		/* Insert into HW table */
-		build_fail = ppc_md.tce_build(tbl, entry, npages,
+		build_fail = tbl->it_ops->set(tbl, entry, npages,
 					      vaddr & IOMMU_PAGE_MASK(tbl),
 					      direction, attrs);
 		if(unlikely(build_fail))
@@ -534,8 +534,8 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
 	}
 
 	/* Flush/invalidate TLB caches if necessary */
-	if (ppc_md.tce_flush)
-		ppc_md.tce_flush(tbl);
+	if (tbl->it_ops->flush)
+		tbl->it_ops->flush(tbl);
 
 	DBG("mapped %d elements:\n", outcount);
 
@@ -600,8 +600,8 @@ void ppc_iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
 	 * do not do an mb() here, the affected platforms do not need it
 	 * when freeing.
 	 */
-	if (ppc_md.tce_flush)
-		ppc_md.tce_flush(tbl);
+	if (tbl->it_ops->flush)
+		tbl->it_ops->flush(tbl);
 }
 
 static void iommu_table_clear(struct iommu_table *tbl)
@@ -613,17 +613,17 @@ static void iommu_table_clear(struct iommu_table *tbl)
 	 */
 	if (!is_kdump_kernel() || is_fadump_active()) {
 		/* Clear the table in case firmware left allocations in it */
-		ppc_md.tce_free(tbl, tbl->it_offset, tbl->it_size);
+		tbl->it_ops->clear(tbl, tbl->it_offset, tbl->it_size);
 		return;
 	}
 
 #ifdef CONFIG_CRASH_DUMP
-	if (ppc_md.tce_get) {
+	if (tbl->it_ops->get) {
 		unsigned long index, tceval, tcecount = 0;
 
 		/* Reserve the existing mappings left by the first kernel. */
 		for (index = 0; index < tbl->it_size; index++) {
-			tceval = ppc_md.tce_get(tbl, index + tbl->it_offset);
+			tceval = tbl->it_ops->get(tbl, index + tbl->it_offset);
 			/*
 			 * Freed TCE entry contains 0x7fffffffffffffff on JS20
 			 */
@@ -657,6 +657,8 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid)
 	unsigned int i;
 	struct iommu_pool *p;
 
+	BUG_ON(!tbl->it_ops);
+
 	/* number of bytes needed for the bitmap */
 	sz = BITS_TO_LONGS(tbl->it_size) * sizeof(unsigned long);
 
@@ -929,8 +931,8 @@ EXPORT_SYMBOL_GPL(iommu_tce_direction);
 void iommu_flush_tce(struct iommu_table *tbl)
 {
 	/* Flush/invalidate TLB caches if necessary */
-	if (ppc_md.tce_flush)
-		ppc_md.tce_flush(tbl);
+	if (tbl->it_ops->flush)
+		tbl->it_ops->flush(tbl);
 
 	/* Make sure updates are seen by hardware */
 	mb();
@@ -941,7 +943,7 @@ int iommu_tce_clear_param_check(struct iommu_table *tbl,
 		unsigned long ioba, unsigned long tce_value,
 		unsigned long npages)
 {
-	/* ppc_md.tce_free() does not support any value but 0 */
+	/* tbl->it_ops->clear() does not support any value but 0 */
 	if (tce_value)
 		return -EINVAL;
 
@@ -989,9 +991,9 @@ unsigned long iommu_clear_tce(struct iommu_table *tbl, unsigned long entry)
 
 	spin_lock(&(pool->lock));
 
-	oldtce = ppc_md.tce_get(tbl, entry);
+	oldtce = tbl->it_ops->get(tbl, entry);
 	if (oldtce & (TCE_PCI_WRITE | TCE_PCI_READ))
-		ppc_md.tce_free(tbl, entry, 1);
+		tbl->it_ops->clear(tbl, entry, 1);
 	else
 		oldtce = 0;
 
@@ -1014,10 +1016,10 @@ int iommu_tce_build(struct iommu_table *tbl, unsigned long entry,
 
 	spin_lock(&(pool->lock));
 
-	oldtce = ppc_md.tce_get(tbl, entry);
+	oldtce = tbl->it_ops->get(tbl, entry);
 	/* Add new entry if it is not busy */
 	if (!(oldtce & (TCE_PCI_WRITE | TCE_PCI_READ)))
-		ret = ppc_md.tce_build(tbl, entry, 1, hwaddr, direction, NULL);
+		ret = tbl->it_ops->set(tbl, entry, 1, hwaddr, direction, NULL);
 
 	spin_unlock(&(pool->lock));