ia64: remove the zx1 swiotlb machvec

The aim of this machvec is to support devices with < 32-bit dma
masks.  But given that ia64 only has a ZONE_DMA32 and not a ZONE_DMA
that isn't supported by swiotlb either.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lkml.kernel.org/r/20190813072514.23299-21-hch@lst.de
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/hp/common/Makefile

@@ -7,6 +7,4 @@
 #
 
 obj-y := sba_iommu.o
-obj-$(CONFIG_IA64_HP_ZX1_SWIOTLB) += hwsw_iommu.o
-obj-$(CONFIG_IA64_GENERIC) += hwsw_iommu.o
 obj-$(CONFIG_IA64_HP_AML_NFW) += aml_nfw.o

arch/ia64/hp/common/hwsw_iommu.c

@@ -1,60 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (c) 2004 Hewlett-Packard Development Company, L.P.
- *   Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
- *
- * This is a pseudo I/O MMU which dispatches to the hardware I/O MMU
- * whenever possible.  We assume that the hardware I/O MMU requires
- * full 32-bit addressability, as is the case, e.g., for HP zx1-based
- * systems (there, the I/O MMU window is mapped at 3-4GB).  If a
- * device doesn't provide full 32-bit addressability, we fall back on
- * the sw I/O TLB.  This is good enough to let us support broken
- * hardware such as soundcards which have a DMA engine that can
- * address only 28 bits.
- */
-
-#include <linux/device.h>
-#include <linux/dma-mapping.h>
-#include <linux/swiotlb.h>
-#include <linux/export.h>
-#include <asm/machvec.h>
-
-extern const struct dma_map_ops sba_dma_ops;
-
-/* swiotlb declarations & definitions: */
-extern int swiotlb_late_init_with_default_size (size_t size);
-
-/*
- * Note: we need to make the determination of whether or not to use
- * the sw I/O TLB based purely on the device structure.  Anything else
- * would be unreliable or would be too intrusive.
- */
-static inline int use_swiotlb(struct device *dev)
-{
-	return dev && dev->dma_mask &&
-		!sba_dma_ops.dma_supported(dev, *dev->dma_mask);
-}
-
-const struct dma_map_ops *hwsw_dma_get_ops(struct device *dev)
-{
-	if (use_swiotlb(dev))
-		return NULL;
-	return &sba_dma_ops;
-}
-EXPORT_SYMBOL(hwsw_dma_get_ops);
-
-void __init
-hwsw_init (void)
-{
-	/* default to a smallish 2MB sw I/O TLB */
-	if (swiotlb_late_init_with_default_size (2 * (1<<20)) != 0) {
-#ifdef CONFIG_IA64_GENERIC
-		/* Better to have normal DMA than panic */
-		printk(KERN_WARNING "%s: Failed to initialize software I/O TLB,"
-		       " reverting to hpzx1 platform vector\n", __func__);
-		machvec_init("hpzx1");
-#else
-		panic("Unable to initialize software I/O TLB services");
-#endif
-	}
-}

arch/ia64/hp/common/sba_iommu.c

@@ -2059,7 +2059,7 @@ arch_initcall(acpi_sba_ioc_init_acpi);
 static int __init
 sba_init(void)
 {
-	if (!ia64_platform_is("hpzx1") && !ia64_platform_is("hpzx1_swiotlb"))
+	if (!ia64_platform_is("hpzx1"))
 		return 0;
 
 #if defined(CONFIG_IA64_GENERIC)
@@ -2102,19 +2102,6 @@ sba_init(void)
 		return 0;
 	}
 
-#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_HP_ZX1_SWIOTLB)
-	/*
-	 * hpzx1_swiotlb needs to have a fairly small swiotlb bounce
-	 * buffer setup to support devices with smaller DMA masks than
-	 * sba_iommu can handle.
-	 */
-	if (ia64_platform_is("hpzx1_swiotlb")) {
-		extern void hwsw_init(void);
-
-		hwsw_init();
-	}
-#endif
-
 	{
 		struct pci_bus *b = NULL;
 		while ((b = pci_find_next_bus(b)) != NULL)