Merging upstream version 6.7.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 2155 deletions

diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
deleted file mode 100644
index c4d477e8bc..0000000000
--- a/arch/ia64/hp/common/sba_iommu.c
+++ /dev/null
@@ -1,2155 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
-**  IA64 System Bus Adapter (SBA) I/O MMU manager
-**
-**	(c) Copyright 2002-2005 Alex Williamson
-**	(c) Copyright 2002-2003 Grant Grundler
-**	(c) Copyright 2002-2005 Hewlett-Packard Company
-**
-**	Portions (c) 2000 Grant Grundler (from parisc I/O MMU code)
-**	Portions (c) 1999 Dave S. Miller (from sparc64 I/O MMU code)
-**
-**
-**
-** This module initializes the IOC (I/O Controller) found on HP
-** McKinley machines and their successors.
-**
-*/
-
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/mm.h>
-#include <linux/string.h>
-#include <linux/pci.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/acpi.h>
-#include <linux/efi.h>
-#include <linux/nodemask.h>
-#include <linux/bitops.h>         /* hweight64() */
-#include <linux/crash_dump.h>
-#include <linux/iommu-helper.h>
-#include <linux/dma-map-ops.h>
-#include <linux/prefetch.h>
-#include <linux/swiotlb.h>
-
-#include <asm/delay.h>		/* ia64_get_itc() */
-#include <asm/io.h>
-#include <asm/page.h>		/* PAGE_OFFSET */
-#include <asm/dma.h>
-
-#include <asm/acpi-ext.h>
-
-#define PFX "IOC: "
-
-/*
-** Enabling timing search of the pdir resource map.  Output in /proc.
-** Disabled by default to optimize performance.
-*/
-#undef PDIR_SEARCH_TIMING
-
-/*
-** This option allows cards capable of 64bit DMA to bypass the IOMMU.  If
-** not defined, all DMA will be 32bit and go through the TLB.
-** There's potentially a conflict in the bio merge code with us
-** advertising an iommu, but then bypassing it.  Since I/O MMU bypassing
-** appears to give more performance than bio-level virtual merging, we'll
-** do the former for now.  NOTE: BYPASS_SG also needs to be undef'd to
-** completely restrict DMA to the IOMMU.
-*/
-#define ALLOW_IOV_BYPASS
-
-/*
-** This option specifically allows/disallows bypassing scatterlists with
-** multiple entries.  Coalescing these entries can allow better DMA streaming
-** and in some cases shows better performance than entirely bypassing the
-** IOMMU.  Performance increase on the order of 1-2% sequential output/input
-** using bonnie++ on a RAID0 MD device (sym2 & mpt).
-*/
-#undef ALLOW_IOV_BYPASS_SG
-
-/*
-** If a device prefetches beyond the end of a valid pdir entry, it will cause
-** a hard failure, ie. MCA.  Version 3.0 and later of the zx1 LBA should
-** disconnect on 4k boundaries and prevent such issues.  If the device is
-** particularly aggressive, this option will keep the entire pdir valid such
-** that prefetching will hit a valid address.  This could severely impact
-** error containment, and is therefore off by default.  The page that is
-** used for spill-over is poisoned, so that should help debugging somewhat.
-*/
-#undef FULL_VALID_PDIR
-
-#define ENABLE_MARK_CLEAN
-
-/*
-** The number of debug flags is a clue - this code is fragile.  NOTE: since
-** tightening the use of res_lock the resource bitmap and actual pdir are no
-** longer guaranteed to stay in sync.  The sanity checking code isn't going to
-** like that.
-*/
-#undef DEBUG_SBA_INIT
-#undef DEBUG_SBA_RUN
-#undef DEBUG_SBA_RUN_SG
-#undef DEBUG_SBA_RESOURCE
-#undef ASSERT_PDIR_SANITY
-#undef DEBUG_LARGE_SG_ENTRIES
-#undef DEBUG_BYPASS
-
-#if defined(FULL_VALID_PDIR) && defined(ASSERT_PDIR_SANITY)
-#error FULL_VALID_PDIR and ASSERT_PDIR_SANITY are mutually exclusive
-#endif
-
-#define SBA_INLINE	__inline__
-/* #define SBA_INLINE */
-
-#ifdef DEBUG_SBA_INIT
-#define DBG_INIT(x...)	printk(x)
-#else
-#define DBG_INIT(x...)
-#endif
-
-#ifdef DEBUG_SBA_RUN
-#define DBG_RUN(x...)	printk(x)
-#else
-#define DBG_RUN(x...)
-#endif
-
-#ifdef DEBUG_SBA_RUN_SG
-#define DBG_RUN_SG(x...)	printk(x)
-#else
-#define DBG_RUN_SG(x...)
-#endif
-
-
-#ifdef DEBUG_SBA_RESOURCE
-#define DBG_RES(x...)	printk(x)
-#else
-#define DBG_RES(x...)
-#endif
-
-#ifdef DEBUG_BYPASS
-#define DBG_BYPASS(x...)	printk(x)
-#else
-#define DBG_BYPASS(x...)
-#endif
-
-#ifdef ASSERT_PDIR_SANITY
-#define ASSERT(expr) \
-        if(!(expr)) { \
-                printk( "\n" __FILE__ ":%d: Assertion " #expr " failed!\n",__LINE__); \
-                panic(#expr); \
-        }
-#else
-#define ASSERT(expr)
-#endif
-
-/*
-** The number of pdir entries to "free" before issuing
-** a read to PCOM register to flush out PCOM writes.
-** Interacts with allocation granularity (ie 4 or 8 entries
-** allocated and free'd/purged at a time might make this
-** less interesting).
-*/
-#define DELAYED_RESOURCE_CNT	64
-
-#define PCI_DEVICE_ID_HP_SX2000_IOC	0x12ec
-
-#define ZX1_IOC_ID	((PCI_DEVICE_ID_HP_ZX1_IOC << 16) | PCI_VENDOR_ID_HP)
-#define ZX2_IOC_ID	((PCI_DEVICE_ID_HP_ZX2_IOC << 16) | PCI_VENDOR_ID_HP)
-#define REO_IOC_ID	((PCI_DEVICE_ID_HP_REO_IOC << 16) | PCI_VENDOR_ID_HP)
-#define SX1000_IOC_ID	((PCI_DEVICE_ID_HP_SX1000_IOC << 16) | PCI_VENDOR_ID_HP)
-#define SX2000_IOC_ID	((PCI_DEVICE_ID_HP_SX2000_IOC << 16) | PCI_VENDOR_ID_HP)
-
-#define ZX1_IOC_OFFSET	0x1000	/* ACPI reports SBA, we want IOC */
-
-#define IOC_FUNC_ID	0x000
-#define IOC_FCLASS	0x008	/* function class, bist, header, rev... */
-#define IOC_IBASE	0x300	/* IO TLB */
-#define IOC_IMASK	0x308
-#define IOC_PCOM	0x310
-#define IOC_TCNFG	0x318
-#define IOC_PDIR_BASE	0x320
-
-#define IOC_ROPE0_CFG	0x500
-#define   IOC_ROPE_AO	  0x10	/* Allow "Relaxed Ordering" */
-
-
-/* AGP GART driver looks for this */
-#define ZX1_SBA_IOMMU_COOKIE	0x0000badbadc0ffeeUL
-
-/*
-** The zx1 IOC supports 4/8/16/64KB page sizes (see TCNFG register)
-**
-** Some IOCs (sx1000) can run at the above pages sizes, but are
-** really only supported using the IOC at a 4k page size.
-**
-** iovp_size could only be greater than PAGE_SIZE if we are
-** confident the drivers really only touch the next physical
-** page iff that driver instance owns it.
-*/
-static unsigned long iovp_size;
-static unsigned long iovp_shift;
-static unsigned long iovp_mask;
-
-struct ioc {
-	void __iomem	*ioc_hpa;	/* I/O MMU base address */
-	char		*res_map;	/* resource map, bit == pdir entry */
-	u64		*pdir_base;	/* physical base address */
-	unsigned long	ibase;		/* pdir IOV Space base */
-	unsigned long	imask;		/* pdir IOV Space mask */
-
-	unsigned long	*res_hint;	/* next avail IOVP - circular search */
-	unsigned long	dma_mask;
-	spinlock_t	res_lock;	/* protects the resource bitmap, but must be held when */
-					/* clearing pdir to prevent races with allocations. */
-	unsigned int	res_bitshift;	/* from the RIGHT! */
-	unsigned int	res_size;	/* size of resource map in bytes */
-#ifdef CONFIG_NUMA
-	unsigned int	node;		/* node where this IOC lives */
-#endif
-#if DELAYED_RESOURCE_CNT > 0
-	spinlock_t	saved_lock;	/* may want to try to get this on a separate cacheline */
-					/* than res_lock for bigger systems. */
-	int		saved_cnt;
-	struct sba_dma_pair {
-		dma_addr_t	iova;
-		size_t		size;
-	} saved[DELAYED_RESOURCE_CNT];
-#endif
-
-#ifdef PDIR_SEARCH_TIMING
-#define SBA_SEARCH_SAMPLE	0x100
-	unsigned long avg_search[SBA_SEARCH_SAMPLE];
-	unsigned long avg_idx;	/* current index into avg_search */
-#endif
-
-	/* Stuff we don't need in performance path */
-	struct ioc	*next;		/* list of IOC's in system */
-	acpi_handle	handle;		/* for multiple IOC's */
-	const char 	*name;
-	unsigned int	func_id;
-	unsigned int	rev;		/* HW revision of chip */
-	u32		iov_size;
-	unsigned int	pdir_size;	/* in bytes, determined by IOV Space size */
-	struct pci_dev	*sac_only_dev;
-};
-
-static struct ioc *ioc_list, *ioc_found;
-static int reserve_sba_gart = 1;
-
-static SBA_INLINE void sba_mark_invalid(struct ioc *, dma_addr_t, size_t);
-static SBA_INLINE void sba_free_range(struct ioc *, dma_addr_t, size_t);
-
-#define sba_sg_address(sg)	sg_virt((sg))
-
-#ifdef FULL_VALID_PDIR
-static u64 prefetch_spill_page;
-#endif
-
-#define GET_IOC(dev)	((dev_is_pci(dev))						\
-			 ? ((struct ioc *) PCI_CONTROLLER(to_pci_dev(dev))->iommu) : NULL)
-
-/*
-** DMA_CHUNK_SIZE is used by the SCSI mid-layer to break up
-** (or rather not merge) DMAs into manageable chunks.
-** On parisc, this is more of the software/tuning constraint
-** rather than the HW. I/O MMU allocation algorithms can be
-** faster with smaller sizes (to some degree).
-*/
-#define DMA_CHUNK_SIZE  (BITS_PER_LONG*iovp_size)
-
-#define ROUNDUP(x,y) ((x + ((y)-1)) & ~((y)-1))
-
-/************************************
-** SBA register read and write support
-**
-** BE WARNED: register writes are posted.
-**  (ie follow writes which must reach HW with a read)
-**
-*/
-#define READ_REG(addr)       __raw_readq(addr)
-#define WRITE_REG(val, addr) __raw_writeq(val, addr)
-
-#ifdef DEBUG_SBA_INIT
-
-/**
- * sba_dump_tlb - debugging only - print IOMMU operating parameters
- * @hpa: base address of the IOMMU
- *
- * Print the size/location of the IO MMU PDIR.
- */
-static void
-sba_dump_tlb(char *hpa)
-{
-	DBG_INIT("IO TLB at 0x%p\n", (void *)hpa);
-	DBG_INIT("IOC_IBASE    : %016lx\n", READ_REG(hpa+IOC_IBASE));
-	DBG_INIT("IOC_IMASK    : %016lx\n", READ_REG(hpa+IOC_IMASK));
-	DBG_INIT("IOC_TCNFG    : %016lx\n", READ_REG(hpa+IOC_TCNFG));
-	DBG_INIT("IOC_PDIR_BASE: %016lx\n", READ_REG(hpa+IOC_PDIR_BASE));
-	DBG_INIT("\n");
-}
-#endif
-
-
-#ifdef ASSERT_PDIR_SANITY
-
-/**
- * sba_dump_pdir_entry - debugging only - print one IOMMU PDIR entry
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @msg: text to print ont the output line.
- * @pide: pdir index.
- *
- * Print one entry of the IO MMU PDIR in human readable form.
- */
-static void
-sba_dump_pdir_entry(struct ioc *ioc, char *msg, uint pide)
-{
-	/* start printing from lowest pde in rval */
-	u64 *ptr = &ioc->pdir_base[pide  & ~(BITS_PER_LONG - 1)];
-	unsigned long *rptr = (unsigned long *) &ioc->res_map[(pide >>3) & -sizeof(unsigned long)];
-	uint rcnt;
-
-	printk(KERN_DEBUG "SBA: %s rp %p bit %d rval 0x%lx\n",
-		 msg, rptr, pide & (BITS_PER_LONG - 1), *rptr);
-
-	rcnt = 0;
-	while (rcnt < BITS_PER_LONG) {
-		printk(KERN_DEBUG "%s %2d %p %016Lx\n",
-		       (rcnt == (pide & (BITS_PER_LONG - 1)))
-		       ? "    -->" : "       ",
-		       rcnt, ptr, (unsigned long long) *ptr );
-		rcnt++;
-		ptr++;
-	}
-	printk(KERN_DEBUG "%s", msg);
-}
-
-
-/**
- * sba_check_pdir - debugging only - consistency checker
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @msg: text to print ont the output line.
- *
- * Verify the resource map and pdir state is consistent
- */
-static int
-sba_check_pdir(struct ioc *ioc, char *msg)
-{
-	u64 *rptr_end = (u64 *) &(ioc->res_map[ioc->res_size]);
-	u64 *rptr = (u64 *) ioc->res_map;	/* resource map ptr */
-	u64 *pptr = ioc->pdir_base;	/* pdir ptr */
-	uint pide = 0;
-
-	while (rptr < rptr_end) {
-		u64 rval;
-		int rcnt; /* number of bits we might check */
-
-		rval = *rptr;
-		rcnt = 64;
-
-		while (rcnt) {
-			/* Get last byte and highest bit from that */
-			u32 pde = ((u32)((*pptr >> (63)) & 0x1));
-			if ((rval & 0x1) ^ pde)
-			{
-				/*
-				** BUMMER!  -- res_map != pdir --
-				** Dump rval and matching pdir entries
-				*/
-				sba_dump_pdir_entry(ioc, msg, pide);
-				return(1);
-			}
-			rcnt--;
-			rval >>= 1;	/* try the next bit */
-			pptr++;
-			pide++;
-		}
-		rptr++;	/* look at next word of res_map */
-	}
-	/* It'd be nice if we always got here :^) */
-	return 0;
-}
-
-
-/**
- * sba_dump_sg - debugging only - print Scatter-Gather list
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @startsg: head of the SG list
- * @nents: number of entries in SG list
- *
- * print the SG list so we can verify it's correct by hand.
- */
-static void
-sba_dump_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
-{
-	while (nents-- > 0) {
-		printk(KERN_DEBUG " %d : DMA %08lx/%05x CPU %p\n", nents,
-		       startsg->dma_address, startsg->dma_length,
-		       sba_sg_address(startsg));
-		startsg = sg_next(startsg);
-	}
-}
-
-static void
-sba_check_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
-{
-	struct scatterlist *the_sg = startsg;
-	int the_nents = nents;
-
-	while (the_nents-- > 0) {
-		if (sba_sg_address(the_sg) == 0x0UL)
-			sba_dump_sg(NULL, startsg, nents);
-		the_sg = sg_next(the_sg);
-	}
-}
-
-#endif /* ASSERT_PDIR_SANITY */
-
-
-
-
-/**************************************************************
-*
-*   I/O Pdir Resource Management
-*
-*   Bits set in the resource map are in use.
-*   Each bit can represent a number of pages.
-*   LSbs represent lower addresses (IOVA's).
-*
-***************************************************************/
-#define PAGES_PER_RANGE 1	/* could increase this to 4 or 8 if needed */
-
-/* Convert from IOVP to IOVA and vice versa. */
-#define SBA_IOVA(ioc,iovp,offset) ((ioc->ibase) | (iovp) | (offset))
-#define SBA_IOVP(ioc,iova) ((iova) & ~(ioc->ibase))
-
-#define PDIR_ENTRY_SIZE	sizeof(u64)
-
-#define PDIR_INDEX(iovp)   ((iovp)>>iovp_shift)
-
-#define RESMAP_MASK(n)    ~(~0UL << (n))
-#define RESMAP_IDX_MASK   (sizeof(unsigned long) - 1)
-
-
-/**
- * For most cases the normal get_order is sufficient, however it limits us
- * to PAGE_SIZE being the minimum mapping alignment and TC flush granularity.
- * It only incurs about 1 clock cycle to use this one with the static variable
- * and makes the code more intuitive.
- */
-static SBA_INLINE int
-get_iovp_order (unsigned long size)
-{
-	long double d = size - 1;
-	long order;
-
-	order = ia64_getf_exp(d);
-	order = order - iovp_shift - 0xffff + 1;
-	if (order < 0)
-		order = 0;
-	return order;
-}
-
-static unsigned long ptr_to_pide(struct ioc *ioc, unsigned long *res_ptr,
-				 unsigned int bitshiftcnt)
-{
-	return (((unsigned long)res_ptr - (unsigned long)ioc->res_map) << 3)
-		+ bitshiftcnt;
-}
-
-/**
- * sba_search_bitmap - find free space in IO PDIR resource bitmap
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @bits_wanted: number of entries we need.
- * @use_hint: use res_hint to indicate where to start looking
- *
- * Find consecutive free bits in resource bitmap.
- * Each bit represents one entry in the IO Pdir.
- * Cool perf optimization: search for log2(size) bits at a time.
- */
-static SBA_INLINE unsigned long
-sba_search_bitmap(struct ioc *ioc, struct device *dev,
-		  unsigned long bits_wanted, int use_hint)
-{
-	unsigned long *res_ptr;
-	unsigned long *res_end = (unsigned long *) &(ioc->res_map[ioc->res_size]);
-	unsigned long flags, pide = ~0UL, tpide;
-	unsigned long boundary_size;
-	unsigned long shift;
-	int ret;
-
-	ASSERT(((unsigned long) ioc->res_hint & (sizeof(unsigned long) - 1UL)) == 0);
-	ASSERT(res_ptr < res_end);
-
-	boundary_size = dma_get_seg_boundary_nr_pages(dev, iovp_shift);
-
-	BUG_ON(ioc->ibase & ~iovp_mask);
-	shift = ioc->ibase >> iovp_shift;
-
-	spin_lock_irqsave(&ioc->res_lock, flags);
-
-	/* Allow caller to force a search through the entire resource space */
-	if (likely(use_hint)) {
-		res_ptr = ioc->res_hint;
-	} else {
-		res_ptr = (ulong *)ioc->res_map;
-		ioc->res_bitshift = 0;
-	}
-
-	/*
-	 * N.B.  REO/Grande defect AR2305 can cause TLB fetch timeouts
-	 * if a TLB entry is purged while in use.  sba_mark_invalid()
-	 * purges IOTLB entries in power-of-two sizes, so we also
-	 * allocate IOVA space in power-of-two sizes.
-	 */
-	bits_wanted = 1UL << get_iovp_order(bits_wanted << iovp_shift);
-
-	if (likely(bits_wanted == 1)) {
-		unsigned int bitshiftcnt;
-		for(; res_ptr < res_end ; res_ptr++) {
-			if (likely(*res_ptr != ~0UL)) {
-				bitshiftcnt = ffz(*res_ptr);
-				*res_ptr |= (1UL << bitshiftcnt);
-				pide = ptr_to_pide(ioc, res_ptr, bitshiftcnt);
-				ioc->res_bitshift = bitshiftcnt + bits_wanted;
-				goto found_it;
-			}
-		}
-		goto not_found;
-
-	}
-	
-	if (likely(bits_wanted <= BITS_PER_LONG/2)) {
-		/*
-		** Search the resource bit map on well-aligned values.
-		** "o" is the alignment.
-		** We need the alignment to invalidate I/O TLB using
-		** SBA HW features in the unmap path.
-		*/
-		unsigned long o = 1 << get_iovp_order(bits_wanted << iovp_shift);
-		uint bitshiftcnt = ROUNDUP(ioc->res_bitshift, o);
-		unsigned long mask, base_mask;
-
-		base_mask = RESMAP_MASK(bits_wanted);
-		mask = base_mask << bitshiftcnt;
-
-		DBG_RES("%s() o %ld %p", __func__, o, res_ptr);
-		for(; res_ptr < res_end ; res_ptr++)
-		{ 
-			DBG_RES("    %p %lx %lx\n", res_ptr, mask, *res_ptr);
-			ASSERT(0 != mask);
-			for (; mask ; mask <<= o, bitshiftcnt += o) {
-				tpide = ptr_to_pide(ioc, res_ptr, bitshiftcnt);
-				ret = iommu_is_span_boundary(tpide, bits_wanted,
-							     shift,
-							     boundary_size);
-				if ((0 == ((*res_ptr) & mask)) && !ret) {
-					*res_ptr |= mask;     /* mark resources busy! */
-					pide = tpide;
-					ioc->res_bitshift = bitshiftcnt + bits_wanted;
-					goto found_it;
-				}
-			}
-
-			bitshiftcnt = 0;
-			mask = base_mask;
-
-		}
-
-	} else {
-		int qwords, bits, i;
-		unsigned long *end;
-
-		qwords = bits_wanted >> 6; /* /64 */
-		bits = bits_wanted - (qwords * BITS_PER_LONG);
-
-		end = res_end - qwords;
-
-		for (; res_ptr < end; res_ptr++) {
-			tpide = ptr_to_pide(ioc, res_ptr, 0);
-			ret = iommu_is_span_boundary(tpide, bits_wanted,
-						     shift, boundary_size);
-			if (ret)
-				goto next_ptr;
-			for (i = 0 ; i < qwords ; i++) {
-				if (res_ptr[i] != 0)
-					goto next_ptr;
-			}
-			if (bits && res_ptr[i] && (__ffs(res_ptr[i]) < bits))
-				continue;
-
-			/* Found it, mark it */
-			for (i = 0 ; i < qwords ; i++)
-				res_ptr[i] = ~0UL;
-			res_ptr[i] |= RESMAP_MASK(bits);
-
-			pide = tpide;
-			res_ptr += qwords;
-			ioc->res_bitshift = bits;
-			goto found_it;
-next_ptr:
-			;
-		}
-	}
-
-not_found:
-	prefetch(ioc->res_map);
-	ioc->res_hint = (unsigned long *) ioc->res_map;
-	ioc->res_bitshift = 0;
-	spin_unlock_irqrestore(&ioc->res_lock, flags);
-	return (pide);
-
-found_it:
-	ioc->res_hint = res_ptr;
-	spin_unlock_irqrestore(&ioc->res_lock, flags);
-	return (pide);
-}
-
-
-/**
- * sba_alloc_range - find free bits and mark them in IO PDIR resource bitmap
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @size: number of bytes to create a mapping for
- *
- * Given a size, find consecutive unmarked and then mark those bits in the
- * resource bit map.
- */
-static int
-sba_alloc_range(struct ioc *ioc, struct device *dev, size_t size)
-{
-	unsigned int pages_needed = size >> iovp_shift;
-#ifdef PDIR_SEARCH_TIMING
-	unsigned long itc_start;
-#endif
-	unsigned long pide;
-
-	ASSERT(pages_needed);
-	ASSERT(0 == (size & ~iovp_mask));
-
-#ifdef PDIR_SEARCH_TIMING
-	itc_start = ia64_get_itc();
-#endif
-	/*
-	** "seek and ye shall find"...praying never hurts either...
-	*/
-	pide = sba_search_bitmap(ioc, dev, pages_needed, 1);
-	if (unlikely(pide >= (ioc->res_size << 3))) {
-		pide = sba_search_bitmap(ioc, dev, pages_needed, 0);
-		if (unlikely(pide >= (ioc->res_size << 3))) {
-#if DELAYED_RESOURCE_CNT > 0
-			unsigned long flags;
-
-			/*
-			** With delayed resource freeing, we can give this one more shot.  We're
-			** getting close to being in trouble here, so do what we can to make this
-			** one count.
-			*/
-			spin_lock_irqsave(&ioc->saved_lock, flags);
-			if (ioc->saved_cnt > 0) {
-				struct sba_dma_pair *d;
-				int cnt = ioc->saved_cnt;
-
-				d = &(ioc->saved[ioc->saved_cnt - 1]);
-
-				spin_lock(&ioc->res_lock);
-				while (cnt--) {
-					sba_mark_invalid(ioc, d->iova, d->size);
-					sba_free_range(ioc, d->iova, d->size);
-					d--;
-				}
-				ioc->saved_cnt = 0;
-				READ_REG(ioc->ioc_hpa+IOC_PCOM);	/* flush purges */
-				spin_unlock(&ioc->res_lock);
-			}
-			spin_unlock_irqrestore(&ioc->saved_lock, flags);
-
-			pide = sba_search_bitmap(ioc, dev, pages_needed, 0);
-			if (unlikely(pide >= (ioc->res_size << 3))) {
-				printk(KERN_WARNING "%s: I/O MMU @ %p is"
-				       "out of mapping resources, %u %u %lx\n",
-				       __func__, ioc->ioc_hpa, ioc->res_size,
-				       pages_needed, dma_get_seg_boundary(dev));
-				return -1;
-			}
-#else
-			printk(KERN_WARNING "%s: I/O MMU @ %p is"
-			       "out of mapping resources, %u %u %lx\n",
-			       __func__, ioc->ioc_hpa, ioc->res_size,
-			       pages_needed, dma_get_seg_boundary(dev));
-			return -1;
-#endif
-		}
-	}
-
-#ifdef PDIR_SEARCH_TIMING
-	ioc->avg_search[ioc->avg_idx++] = (ia64_get_itc() - itc_start) / pages_needed;
-	ioc->avg_idx &= SBA_SEARCH_SAMPLE - 1;
-#endif
-
-	prefetchw(&(ioc->pdir_base[pide]));
-
-#ifdef ASSERT_PDIR_SANITY
-	/* verify the first enable bit is clear */
-	if(0x00 != ((u8 *) ioc->pdir_base)[pide*PDIR_ENTRY_SIZE + 7]) {
-		sba_dump_pdir_entry(ioc, "sba_search_bitmap() botched it?", pide);
-	}
-#endif
-
-	DBG_RES("%s(%x) %d -> %lx hint %x/%x\n",
-		__func__, size, pages_needed, pide,
-		(uint) ((unsigned long) ioc->res_hint - (unsigned long) ioc->res_map),
-		ioc->res_bitshift );
-
-	return (pide);
-}
-
-
-/**
- * sba_free_range - unmark bits in IO PDIR resource bitmap
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @iova: IO virtual address which was previously allocated.
- * @size: number of bytes to create a mapping for
- *
- * clear bits in the ioc's resource map
- */
-static SBA_INLINE void
-sba_free_range(struct ioc *ioc, dma_addr_t iova, size_t size)
-{
-	unsigned long iovp = SBA_IOVP(ioc, iova);
-	unsigned int pide = PDIR_INDEX(iovp);
-	unsigned int ridx = pide >> 3;	/* convert bit to byte address */
-	unsigned long *res_ptr = (unsigned long *) &((ioc)->res_map[ridx & ~RESMAP_IDX_MASK]);
-	int bits_not_wanted = size >> iovp_shift;
-	unsigned long m;
-
-	/* Round up to power-of-two size: see AR2305 note above */
-	bits_not_wanted = 1UL << get_iovp_order(bits_not_wanted << iovp_shift);
-	for (; bits_not_wanted > 0 ; res_ptr++) {
-		
-		if (unlikely(bits_not_wanted > BITS_PER_LONG)) {
-
-			/* these mappings start 64bit aligned */
-			*res_ptr = 0UL;
-			bits_not_wanted -= BITS_PER_LONG;
-			pide += BITS_PER_LONG;
-
-		} else {
-
-			/* 3-bits "bit" address plus 2 (or 3) bits for "byte" == bit in word */
-			m = RESMAP_MASK(bits_not_wanted) << (pide & (BITS_PER_LONG - 1));
-			bits_not_wanted = 0;
-
-			DBG_RES("%s( ,%x,%x) %x/%lx %x %p %lx\n", __func__, (uint) iova, size,
-			        bits_not_wanted, m, pide, res_ptr, *res_ptr);
-
-			ASSERT(m != 0);
-			ASSERT(bits_not_wanted);
-			ASSERT((*res_ptr & m) == m); /* verify same bits are set */
-			*res_ptr &= ~m;
-		}
-	}
-}
-
-
-/**************************************************************
-*
-*   "Dynamic DMA Mapping" support (aka "Coherent I/O")
-*
-***************************************************************/
-
-/**
- * sba_io_pdir_entry - fill in one IO PDIR entry
- * @pdir_ptr:  pointer to IO PDIR entry
- * @vba: Virtual CPU address of buffer to map
- *
- * SBA Mapping Routine
- *
- * Given a virtual address (vba, arg1) sba_io_pdir_entry()
- * loads the I/O PDIR entry pointed to by pdir_ptr (arg0).
- * Each IO Pdir entry consists of 8 bytes as shown below
- * (LSB == bit 0):
- *
- *  63                    40                                 11    7        0
- * +-+---------------------+----------------------------------+----+--------+
- * |V|        U            |            PPN[39:12]            | U  |   FF   |
- * +-+---------------------+----------------------------------+----+--------+
- *
- *  V  == Valid Bit
- *  U  == Unused
- * PPN == Physical Page Number
- *
- * The physical address fields are filled with the results of virt_to_phys()
- * on the vba.
- */
-
-#if 1
-#define sba_io_pdir_entry(pdir_ptr, vba) *pdir_ptr = ((vba & ~0xE000000000000FFFULL)	\
-						      | 0x8000000000000000ULL)
-#else
-void SBA_INLINE
-sba_io_pdir_entry(u64 *pdir_ptr, unsigned long vba)
-{
-	*pdir_ptr = ((vba & ~0xE000000000000FFFULL) | 0x80000000000000FFULL);
-}
-#endif
-
-#ifdef ENABLE_MARK_CLEAN
-/*
- * Since DMA is i-cache coherent, any (complete) pages that were written via
- * DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to
- * flush them when they get mapped into an executable vm-area.
- */
-static void mark_clean(void *addr, size_t size)
-{
-	struct folio *folio = virt_to_folio(addr);
-	ssize_t left = size;
-	size_t offset = offset_in_folio(folio, addr);
-
-	if (offset) {
-		left -= folio_size(folio) - offset;
-		if (left <= 0)
-			return;
-		folio = folio_next(folio);
-	}
-
-	while (left >= folio_size(folio)) {
-		left -= folio_size(folio);
-		set_bit(PG_arch_1, &folio->flags);
-		if (!left)
-			break;
-		folio = folio_next(folio);
-	}
-}
-#endif
-
-/**
- * sba_mark_invalid - invalidate one or more IO PDIR entries
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @iova:  IO Virtual Address mapped earlier
- * @byte_cnt:  number of bytes this mapping covers.
- *
- * Marking the IO PDIR entry(ies) as Invalid and invalidate
- * corresponding IO TLB entry. The PCOM (Purge Command Register)
- * is to purge stale entries in the IO TLB when unmapping entries.
- *
- * The PCOM register supports purging of multiple pages, with a minium
- * of 1 page and a maximum of 2GB. Hardware requires the address be
- * aligned to the size of the range being purged. The size of the range
- * must be a power of 2. The "Cool perf optimization" in the
- * allocation routine helps keep that true.
- */
-static SBA_INLINE void
-sba_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
-{
-	u32 iovp = (u32) SBA_IOVP(ioc,iova);
-
-	int off = PDIR_INDEX(iovp);
-
-	/* Must be non-zero and rounded up */
-	ASSERT(byte_cnt > 0);
-	ASSERT(0 == (byte_cnt & ~iovp_mask));
-
-#ifdef ASSERT_PDIR_SANITY
-	/* Assert first pdir entry is set */
-	if (!(ioc->pdir_base[off] >> 60)) {
-		sba_dump_pdir_entry(ioc,"sba_mark_invalid()", PDIR_INDEX(iovp));
-	}
-#endif
-
-	if (byte_cnt <= iovp_size)
-	{
-		ASSERT(off < ioc->pdir_size);
-
-		iovp |= iovp_shift;     /* set "size" field for PCOM */
-
-#ifndef FULL_VALID_PDIR
-		/*
-		** clear I/O PDIR entry "valid" bit
-		** Do NOT clear the rest - save it for debugging.
-		** We should only clear bits that have previously
-		** been enabled.
-		*/
-		ioc->pdir_base[off] &= ~(0x80000000000000FFULL);
-#else
-		/*
-  		** If we want to maintain the PDIR as valid, put in
-		** the spill page so devices prefetching won't
-		** cause a hard fail.
-		*/
-		ioc->pdir_base[off] = (0x80000000000000FFULL | prefetch_spill_page);
-#endif
-	} else {
-		u32 t = get_iovp_order(byte_cnt) + iovp_shift;
-
-		iovp |= t;
-		ASSERT(t <= 31);   /* 2GB! Max value of "size" field */
-
-		do {
-			/* verify this pdir entry is enabled */
-			ASSERT(ioc->pdir_base[off]  >> 63);
-#ifndef FULL_VALID_PDIR
-			/* clear I/O Pdir entry "valid" bit first */
-			ioc->pdir_base[off] &= ~(0x80000000000000FFULL);
-#else
-			ioc->pdir_base[off] = (0x80000000000000FFULL | prefetch_spill_page);
-#endif
-			off++;
-			byte_cnt -= iovp_size;
-		} while (byte_cnt > 0);
-	}
-
-	WRITE_REG(iovp | ioc->ibase, ioc->ioc_hpa+IOC_PCOM);
-}
-
-/**
- * sba_map_page - map one buffer and return IOVA for DMA
- * @dev: instance of PCI owned by the driver that's asking.
- * @page: page to map
- * @poff: offset into page
- * @size: number of bytes to map
- * @dir: dma direction
- * @attrs: optional dma attributes
- *
- * See Documentation/core-api/dma-api-howto.rst
- */
-static dma_addr_t sba_map_page(struct device *dev, struct page *page,
-			       unsigned long poff, size_t size,
-			       enum dma_data_direction dir,
-			       unsigned long attrs)
-{
-	struct ioc *ioc;
-	void *addr = page_address(page) + poff;
-	dma_addr_t iovp;
-	dma_addr_t offset;
-	u64 *pdir_start;
-	int pide;
-#ifdef ASSERT_PDIR_SANITY
-	unsigned long flags;
-#endif
-#ifdef ALLOW_IOV_BYPASS
-	unsigned long pci_addr = virt_to_phys(addr);
-#endif
-
-#ifdef ALLOW_IOV_BYPASS
-	ASSERT(to_pci_dev(dev)->dma_mask);
-	/*
- 	** Check if the PCI device can DMA to ptr... if so, just return ptr
- 	*/
-	if (likely((pci_addr & ~to_pci_dev(dev)->dma_mask) == 0)) {
-		/*
- 		** Device is bit capable of DMA'ing to the buffer...
-		** just return the PCI address of ptr
- 		*/
-		DBG_BYPASS("sba_map_page() bypass mask/addr: "
-			   "0x%lx/0x%lx\n",
-		           to_pci_dev(dev)->dma_mask, pci_addr);
-		return pci_addr;
-	}
-#endif
-	ioc = GET_IOC(dev);
-	ASSERT(ioc);
-
-	prefetch(ioc->res_hint);
-
-	ASSERT(size > 0);
-	ASSERT(size <= DMA_CHUNK_SIZE);
-
-	/* save offset bits */
-	offset = ((dma_addr_t) (long) addr) & ~iovp_mask;
-
-	/* round up to nearest iovp_size */
-	size = (size + offset + ~iovp_mask) & iovp_mask;
-
-#ifdef ASSERT_PDIR_SANITY
-	spin_lock_irqsave(&ioc->res_lock, flags);
-	if (sba_check_pdir(ioc,"Check before sba_map_page()"))
-		panic("Sanity check failed");
-	spin_unlock_irqrestore(&ioc->res_lock, flags);
-#endif
-
-	pide = sba_alloc_range(ioc, dev, size);
-	if (pide < 0)
-		return DMA_MAPPING_ERROR;
-
-	iovp = (dma_addr_t) pide << iovp_shift;
-
-	DBG_RUN("%s() 0x%p -> 0x%lx\n", __func__, addr, (long) iovp | offset);
-
-	pdir_start = &(ioc->pdir_base[pide]);
-
-	while (size > 0) {
-		ASSERT(((u8 *)pdir_start)[7] == 0); /* verify availability */
-		sba_io_pdir_entry(pdir_start, (unsigned long) addr);
-
-		DBG_RUN("     pdir 0x%p %lx\n", pdir_start, *pdir_start);
-
-		addr += iovp_size;
-		size -= iovp_size;
-		pdir_start++;
-	}
-	/* force pdir update */
-	wmb();
-
-	/* form complete address */
-#ifdef ASSERT_PDIR_SANITY
-	spin_lock_irqsave(&ioc->res_lock, flags);
-	sba_check_pdir(ioc,"Check after sba_map_page()");
-	spin_unlock_irqrestore(&ioc->res_lock, flags);
-#endif
-	return SBA_IOVA(ioc, iovp, offset);
-}
-
-#ifdef ENABLE_MARK_CLEAN
-static SBA_INLINE void
-sba_mark_clean(struct ioc *ioc, dma_addr_t iova, size_t size)
-{
-	u32	iovp = (u32) SBA_IOVP(ioc,iova);
-	int	off = PDIR_INDEX(iovp);
-	void	*addr;
-
-	if (size <= iovp_size) {
-		addr = phys_to_virt(ioc->pdir_base[off] &
-		                    ~0xE000000000000FFFULL);
-		mark_clean(addr, size);
-	} else {
-		do {
-			addr = phys_to_virt(ioc->pdir_base[off] &
-			                    ~0xE000000000000FFFULL);
-			mark_clean(addr, min(size, iovp_size));
-			off++;
-			size -= iovp_size;
-		} while (size > 0);
-	}
-}
-#endif
-
-/**
- * sba_unmap_page - unmap one IOVA and free resources
- * @dev: instance of PCI owned by the driver that's asking.
- * @iova:  IOVA of driver buffer previously mapped.
- * @size:  number of bytes mapped in driver buffer.
- * @dir:  R/W or both.
- * @attrs: optional dma attributes
- *
- * See Documentation/core-api/dma-api-howto.rst
- */
-static void sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
-			   enum dma_data_direction dir, unsigned long attrs)
-{
-	struct ioc *ioc;
-#if DELAYED_RESOURCE_CNT > 0
-	struct sba_dma_pair *d;
-#endif
-	unsigned long flags;
-	dma_addr_t offset;
-
-	ioc = GET_IOC(dev);
-	ASSERT(ioc);
-
-#ifdef ALLOW_IOV_BYPASS
-	if (likely((iova & ioc->imask) != ioc->ibase)) {
-		/*
-		** Address does not fall w/in IOVA, must be bypassing
-		*/
-		DBG_BYPASS("sba_unmap_page() bypass addr: 0x%lx\n",
-			   iova);
-
-#ifdef ENABLE_MARK_CLEAN
-		if (dir == DMA_FROM_DEVICE) {
-			mark_clean(phys_to_virt(iova), size);
-		}
-#endif
-		return;
-	}
-#endif
-	offset = iova & ~iovp_mask;
-
-	DBG_RUN("%s() iovp 0x%lx/%x\n", __func__, (long) iova, size);
-
-	iova ^= offset;        /* clear offset bits */
-	size += offset;
-	size = ROUNDUP(size, iovp_size);
-
-#ifdef ENABLE_MARK_CLEAN
-	if (dir == DMA_FROM_DEVICE)
-		sba_mark_clean(ioc, iova, size);
-#endif
-
-#if DELAYED_RESOURCE_CNT > 0
-	spin_lock_irqsave(&ioc->saved_lock, flags);
-	d = &(ioc->saved[ioc->saved_cnt]);
-	d->iova = iova;
-	d->size = size;
-	if (unlikely(++(ioc->saved_cnt) >= DELAYED_RESOURCE_CNT)) {
-		int cnt = ioc->saved_cnt;
-		spin_lock(&ioc->res_lock);
-		while (cnt--) {
-			sba_mark_invalid(ioc, d->iova, d->size);
-			sba_free_range(ioc, d->iova, d->size);
-			d--;
-		}
-		ioc->saved_cnt = 0;
-		READ_REG(ioc->ioc_hpa+IOC_PCOM);	/* flush purges */
-		spin_unlock(&ioc->res_lock);
-	}
-	spin_unlock_irqrestore(&ioc->saved_lock, flags);
-#else /* DELAYED_RESOURCE_CNT == 0 */
-	spin_lock_irqsave(&ioc->res_lock, flags);
-	sba_mark_invalid(ioc, iova, size);
-	sba_free_range(ioc, iova, size);
-	READ_REG(ioc->ioc_hpa+IOC_PCOM);	/* flush purges */
-	spin_unlock_irqrestore(&ioc->res_lock, flags);
-#endif /* DELAYED_RESOURCE_CNT == 0 */
-}
-
-/**
- * sba_alloc_coherent - allocate/map shared mem for DMA
- * @dev: instance of PCI owned by the driver that's asking.
- * @size:  number of bytes mapped in driver buffer.
- * @dma_handle:  IOVA of new buffer.
- *
- * See Documentation/core-api/dma-api-howto.rst
- */
-static void *
-sba_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
-		   gfp_t flags, unsigned long attrs)
-{
-	struct page *page;
-	struct ioc *ioc;
-	int node = -1;
-	void *addr;
-
-	ioc = GET_IOC(dev);
-	ASSERT(ioc);
-#ifdef CONFIG_NUMA
-	node = ioc->node;
-#endif
-
-	page = alloc_pages_node(node, flags, get_order(size));
-	if (unlikely(!page))
-		return NULL;
-
-	addr = page_address(page);
-	memset(addr, 0, size);
-	*dma_handle = page_to_phys(page);
-
-#ifdef ALLOW_IOV_BYPASS
-	ASSERT(dev->coherent_dma_mask);
-	/*
- 	** Check if the PCI device can DMA to ptr... if so, just return ptr
- 	*/
-	if (likely((*dma_handle & ~dev->coherent_dma_mask) == 0)) {
-		DBG_BYPASS("sba_alloc_coherent() bypass mask/addr: 0x%lx/0x%lx\n",
-		           dev->coherent_dma_mask, *dma_handle);
-
-		return addr;
-	}
-#endif
-
-	/*
-	 * If device can't bypass or bypass is disabled, pass the 32bit fake
-	 * device to map single to get an iova mapping.
-	 */
-	*dma_handle = sba_map_page(&ioc->sac_only_dev->dev, page, 0, size,
-			DMA_BIDIRECTIONAL, 0);
-	if (dma_mapping_error(dev, *dma_handle))
-		return NULL;
-	return addr;
-}
-
-
-/**
- * sba_free_coherent - free/unmap shared mem for DMA
- * @dev: instance of PCI owned by the driver that's asking.
- * @size:  number of bytes mapped in driver buffer.
- * @vaddr:  virtual address IOVA of "consistent" buffer.
- * @dma_handler:  IO virtual address of "consistent" buffer.
- *
- * See Documentation/core-api/dma-api-howto.rst
- */
-static void sba_free_coherent(struct device *dev, size_t size, void *vaddr,
-			      dma_addr_t dma_handle, unsigned long attrs)
-{
-	sba_unmap_page(dev, dma_handle, size, 0, 0);
-	free_pages((unsigned long) vaddr, get_order(size));
-}
-
-
-/*
-** Since 0 is a valid pdir_base index value, can't use that
-** to determine if a value is valid or not. Use a flag to indicate
-** the SG list entry contains a valid pdir index.
-*/
-#define PIDE_FLAG 0x1UL
-
-#ifdef DEBUG_LARGE_SG_ENTRIES
-int dump_run_sg = 0;
-#endif
-
-
-/**
- * sba_fill_pdir - write allocated SG entries into IO PDIR
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @startsg:  list of IOVA/size pairs
- * @nents: number of entries in startsg list
- *
- * Take preprocessed SG list and write corresponding entries
- * in the IO PDIR.
- */
-
-static SBA_INLINE int
-sba_fill_pdir(
-	struct ioc *ioc,
-	struct scatterlist *startsg,
-	int nents)
-{
-	struct scatterlist *dma_sg = startsg;	/* pointer to current DMA */
-	int n_mappings = 0;
-	u64 *pdirp = NULL;
-	unsigned long dma_offset = 0;
-
-	while (nents-- > 0) {
-		int     cnt = startsg->dma_length;
-		startsg->dma_length = 0;
-
-#ifdef DEBUG_LARGE_SG_ENTRIES
-		if (dump_run_sg)
-			printk(" %2d : %08lx/%05x %p\n",
-				nents, startsg->dma_address, cnt,
-				sba_sg_address(startsg));
-#else
-		DBG_RUN_SG(" %d : %08lx/%05x %p\n",
-				nents, startsg->dma_address, cnt,
-				sba_sg_address(startsg));
-#endif
-		/*
-		** Look for the start of a new DMA stream
-		*/
-		if (startsg->dma_address & PIDE_FLAG) {
-			u32 pide = startsg->dma_address & ~PIDE_FLAG;
-			dma_offset = (unsigned long) pide & ~iovp_mask;
-			startsg->dma_address = 0;
-			if (n_mappings)
-				dma_sg = sg_next(dma_sg);
-			dma_sg->dma_address = pide | ioc->ibase;
-			pdirp = &(ioc->pdir_base[pide >> iovp_shift]);
-			n_mappings++;
-		}
-
-		/*
-		** Look for a VCONTIG chunk
-		*/
-		if (cnt) {
-			unsigned long vaddr = (unsigned long) sba_sg_address(startsg);
-			ASSERT(pdirp);
-
-			/* Since multiple Vcontig blocks could make up
-			** one DMA stream, *add* cnt to dma_len.
-			*/
-			dma_sg->dma_length += cnt;
-			cnt += dma_offset;
-			dma_offset=0;	/* only want offset on first chunk */
-			cnt = ROUNDUP(cnt, iovp_size);
-			do {
-				sba_io_pdir_entry(pdirp, vaddr);
-				vaddr += iovp_size;
-				cnt -= iovp_size;
-				pdirp++;
-			} while (cnt > 0);
-		}
-		startsg = sg_next(startsg);
-	}
-	/* force pdir update */
-	wmb();
-
-#ifdef DEBUG_LARGE_SG_ENTRIES
-	dump_run_sg = 0;
-#endif
-	return(n_mappings);
-}
-
-
-/*
-** Two address ranges are DMA contiguous *iff* "end of prev" and
-** "start of next" are both on an IOV page boundary.
-**
-** (shift left is a quick trick to mask off upper bits)
-*/
-#define DMA_CONTIG(__X, __Y) \
-	(((((unsigned long) __X) | ((unsigned long) __Y)) << (BITS_PER_LONG - iovp_shift)) == 0UL)
-
-
-/**
- * sba_coalesce_chunks - preprocess the SG list
- * @ioc: IO MMU structure which owns the pdir we are interested in.
- * @startsg:  list of IOVA/size pairs
- * @nents: number of entries in startsg list
- *
- * First pass is to walk the SG list and determine where the breaks are
- * in the DMA stream. Allocates PDIR entries but does not fill them.
- * Returns the number of DMA chunks.
- *
- * Doing the fill separate from the coalescing/allocation keeps the
- * code simpler. Future enhancement could make one pass through
- * the sglist do both.
- */
-static SBA_INLINE int
-sba_coalesce_chunks(struct ioc *ioc, struct device *dev,
-	struct scatterlist *startsg,
-	int nents)
-{
-	struct scatterlist *vcontig_sg;    /* VCONTIG chunk head */
-	unsigned long vcontig_len;         /* len of VCONTIG chunk */
-	unsigned long vcontig_end;
-	struct scatterlist *dma_sg;        /* next DMA stream head */
-	unsigned long dma_offset, dma_len; /* start/len of DMA stream */
-	int n_mappings = 0;
-	unsigned int max_seg_size = dma_get_max_seg_size(dev);
-	int idx;
-
-	while (nents > 0) {
-		unsigned long vaddr = (unsigned long) sba_sg_address(startsg);
-
-		/*
-		** Prepare for first/next DMA stream
-		*/
-		dma_sg = vcontig_sg = startsg;
-		dma_len = vcontig_len = vcontig_end = startsg->length;
-		vcontig_end +=  vaddr;
-		dma_offset = vaddr & ~iovp_mask;
-
-		/* PARANOID: clear entries */
-		startsg->dma_address = startsg->dma_length = 0;
-
-		/*
-		** This loop terminates one iteration "early" since
-		** it's always looking one "ahead".
-		*/
-		while (--nents > 0) {
-			unsigned long vaddr;	/* tmp */
-
-			startsg = sg_next(startsg);
-
-			/* PARANOID */
-			startsg->dma_address = startsg->dma_length = 0;
-
-			/* catch brokenness in SCSI layer */
-			ASSERT(startsg->length <= DMA_CHUNK_SIZE);
-
-			/*
-			** First make sure current dma stream won't
-			** exceed DMA_CHUNK_SIZE if we coalesce the
-			** next entry.
-			*/
-			if (((dma_len + dma_offset + startsg->length + ~iovp_mask) & iovp_mask)
-			    > DMA_CHUNK_SIZE)
-				break;
-
-			if (dma_len + startsg->length > max_seg_size)
-				break;
-
-			/*
-			** Then look for virtually contiguous blocks.
-			**
-			** append the next transaction?
-			*/
-			vaddr = (unsigned long) sba_sg_address(startsg);
-			if  (vcontig_end == vaddr)
-			{
-				vcontig_len += startsg->length;
-				vcontig_end += startsg->length;
-				dma_len     += startsg->length;
-				continue;
-			}
-
-#ifdef DEBUG_LARGE_SG_ENTRIES
-			dump_run_sg = (vcontig_len > iovp_size);
-#endif
-
-			/*
-			** Not virtually contiguous.
-			** Terminate prev chunk.
-			** Start a new chunk.
-			**
-			** Once we start a new VCONTIG chunk, dma_offset
-			** can't change. And we need the offset from the first
-			** chunk - not the last one. Ergo Successive chunks
-			** must start on page boundaries and dove tail
-			** with it's predecessor.
-			*/
-			vcontig_sg->dma_length = vcontig_len;
-
-			vcontig_sg = startsg;
-			vcontig_len = startsg->length;
-
-			/*
-			** 3) do the entries end/start on page boundaries?
-			**    Don't update vcontig_end until we've checked.
-			*/
-			if (DMA_CONTIG(vcontig_end, vaddr))
-			{
-				vcontig_end = vcontig_len + vaddr;
-				dma_len += vcontig_len;
-				continue;
-			} else {
-				break;
-			}
-		}
-
-		/*
-		** End of DMA Stream
-		** Terminate last VCONTIG block.
-		** Allocate space for DMA stream.
-		*/
-		vcontig_sg->dma_length = vcontig_len;
-		dma_len = (dma_len + dma_offset + ~iovp_mask) & iovp_mask;
-		ASSERT(dma_len <= DMA_CHUNK_SIZE);
-		idx = sba_alloc_range(ioc, dev, dma_len);
-		if (idx < 0) {
-			dma_sg->dma_length = 0;
-			return -1;
-		}
-		dma_sg->dma_address = (dma_addr_t)(PIDE_FLAG | (idx << iovp_shift)
-						   | dma_offset);
-		n_mappings++;
-	}
-
-	return n_mappings;
-}
-
-static void sba_unmap_sg_attrs(struct device *dev, struct scatterlist *sglist,
-			       int nents, enum dma_data_direction dir,
-			       unsigned long attrs);
-/**
- * sba_map_sg - map Scatter/Gather list
- * @dev: instance of PCI owned by the driver that's asking.
- * @sglist:  array of buffer/length pairs
- * @nents:  number of entries in list
- * @dir:  R/W or both.
- * @attrs: optional dma attributes
- *
- * See Documentation/core-api/dma-api-howto.rst
- */
-static int sba_map_sg_attrs(struct device *dev, struct scatterlist *sglist,
-			    int nents, enum dma_data_direction dir,
-			    unsigned long attrs)
-{
-	struct ioc *ioc;
-	int coalesced, filled = 0;
-#ifdef ASSERT_PDIR_SANITY
-	unsigned long flags;
-#endif
-#ifdef ALLOW_IOV_BYPASS_SG
-	struct scatterlist *sg;
-#endif
-
-	DBG_RUN_SG("%s() START %d entries\n", __func__, nents);
-	ioc = GET_IOC(dev);
-	ASSERT(ioc);
-
-#ifdef ALLOW_IOV_BYPASS_SG
-	ASSERT(to_pci_dev(dev)->dma_mask);
-	if (likely((ioc->dma_mask & ~to_pci_dev(dev)->dma_mask) == 0)) {
-		for_each_sg(sglist, sg, nents, filled) {
-			sg->dma_length = sg->length;
-			sg->dma_address = virt_to_phys(sba_sg_address(sg));
-		}
-		return filled;
-	}
-#endif
-	/* Fast path single entry scatterlists. */
-	if (nents == 1) {
-		sglist->dma_length = sglist->length;
-		sglist->dma_address = sba_map_page(dev, sg_page(sglist),
-				sglist->offset, sglist->length, dir, attrs);
-		if (dma_mapping_error(dev, sglist->dma_address))
-			return -EIO;
-		return 1;
-	}
-
-#ifdef ASSERT_PDIR_SANITY
-	spin_lock_irqsave(&ioc->res_lock, flags);
-	if (sba_check_pdir(ioc,"Check before sba_map_sg_attrs()"))
-	{
-		sba_dump_sg(ioc, sglist, nents);
-		panic("Check before sba_map_sg_attrs()");
-	}
-	spin_unlock_irqrestore(&ioc->res_lock, flags);
-#endif
-
-	prefetch(ioc->res_hint);
-
-	/*
-	** First coalesce the chunks and allocate I/O pdir space
-	**
-	** If this is one DMA stream, we can properly map using the
-	** correct virtual address associated with each DMA page.
-	** w/o this association, we wouldn't have coherent DMA!
-	** Access to the virtual address is what forces a two pass algorithm.
-	*/
-	coalesced = sba_coalesce_chunks(ioc, dev, sglist, nents);
-	if (coalesced < 0) {
-		sba_unmap_sg_attrs(dev, sglist, nents, dir, attrs);
-		return -ENOMEM;
-	}
-
-	/*
-	** Program the I/O Pdir
-	**
-	** map the virtual addresses to the I/O Pdir
-	** o dma_address will contain the pdir index
-	** o dma_len will contain the number of bytes to map
-	** o address contains the virtual address.
-	*/
-	filled = sba_fill_pdir(ioc, sglist, nents);
-
-#ifdef ASSERT_PDIR_SANITY
-	spin_lock_irqsave(&ioc->res_lock, flags);
-	if (sba_check_pdir(ioc,"Check after sba_map_sg_attrs()"))
-	{
-		sba_dump_sg(ioc, sglist, nents);
-		panic("Check after sba_map_sg_attrs()\n");
-	}
-	spin_unlock_irqrestore(&ioc->res_lock, flags);
-#endif
-
-	ASSERT(coalesced == filled);
-	DBG_RUN_SG("%s() DONE %d mappings\n", __func__, filled);
-
-	return filled;
-}
-
-/**
- * sba_unmap_sg_attrs - unmap Scatter/Gather list
- * @dev: instance of PCI owned by the driver that's asking.
- * @sglist:  array of buffer/length pairs
- * @nents:  number of entries in list
- * @dir:  R/W or both.
- * @attrs: optional dma attributes
- *
- * See Documentation/core-api/dma-api-howto.rst
- */
-static void sba_unmap_sg_attrs(struct device *dev, struct scatterlist *sglist,
-			       int nents, enum dma_data_direction dir,
-			       unsigned long attrs)
-{
-#ifdef ASSERT_PDIR_SANITY
-	struct ioc *ioc;
-	unsigned long flags;
-#endif
-
-	DBG_RUN_SG("%s() START %d entries,  %p,%x\n",
-		   __func__, nents, sba_sg_address(sglist), sglist->length);
-
-#ifdef ASSERT_PDIR_SANITY
-	ioc = GET_IOC(dev);
-	ASSERT(ioc);
-
-	spin_lock_irqsave(&ioc->res_lock, flags);
-	sba_check_pdir(ioc,"Check before sba_unmap_sg_attrs()");
-	spin_unlock_irqrestore(&ioc->res_lock, flags);
-#endif
-
-	while (nents && sglist->dma_length) {
-
-		sba_unmap_page(dev, sglist->dma_address, sglist->dma_length,
-			       dir, attrs);
-		sglist = sg_next(sglist);
-		nents--;
-	}
-
-	DBG_RUN_SG("%s() DONE (nents %d)\n", __func__,  nents);
-
-#ifdef ASSERT_PDIR_SANITY
-	spin_lock_irqsave(&ioc->res_lock, flags);
-	sba_check_pdir(ioc,"Check after sba_unmap_sg_attrs()");
-	spin_unlock_irqrestore(&ioc->res_lock, flags);
-#endif
-
-}
-
-/**************************************************************
-*
-*   Initialization and claim
-*
-***************************************************************/
-
-static void
-ioc_iova_init(struct ioc *ioc)
-{
-	int tcnfg;
-	int agp_found = 0;
-	struct pci_dev *device = NULL;
-#ifdef FULL_VALID_PDIR
-	unsigned long index;
-#endif
-
-	/*
-	** Firmware programs the base and size of a "safe IOVA space"
-	** (one that doesn't overlap memory or LMMIO space) in the
-	** IBASE and IMASK registers.
-	*/
-	ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE) & ~0x1UL;
-	ioc->imask = READ_REG(ioc->ioc_hpa + IOC_IMASK) | 0xFFFFFFFF00000000UL;
-
-	ioc->iov_size = ~ioc->imask + 1;
-
-	DBG_INIT("%s() hpa %p IOV base 0x%lx mask 0x%lx (%dMB)\n",
-		__func__, ioc->ioc_hpa, ioc->ibase, ioc->imask,
-		ioc->iov_size >> 20);
-
-	switch (iovp_size) {
-		case  4*1024: tcnfg = 0; break;
-		case  8*1024: tcnfg = 1; break;
-		case 16*1024: tcnfg = 2; break;
-		case 64*1024: tcnfg = 3; break;
-		default:
-			panic(PFX "Unsupported IOTLB page size %ldK",
-				iovp_size >> 10);
-			break;
-	}
-	WRITE_REG(tcnfg, ioc->ioc_hpa + IOC_TCNFG);
-
-	ioc->pdir_size = (ioc->iov_size / iovp_size) * PDIR_ENTRY_SIZE;
-	ioc->pdir_base = (void *) __get_free_pages(GFP_KERNEL,
-						   get_order(ioc->pdir_size));
-	if (!ioc->pdir_base)
-		panic(PFX "Couldn't allocate I/O Page Table\n");
-
-	memset(ioc->pdir_base, 0, ioc->pdir_size);
-
-	DBG_INIT("%s() IOV page size %ldK pdir %p size %x\n", __func__,
-		iovp_size >> 10, ioc->pdir_base, ioc->pdir_size);
-
-	ASSERT(ALIGN((unsigned long) ioc->pdir_base, 4*1024) == (unsigned long) ioc->pdir_base);
-	WRITE_REG(virt_to_phys(ioc->pdir_base), ioc->ioc_hpa + IOC_PDIR_BASE);
-
-	/*
-	** If an AGP device is present, only use half of the IOV space
-	** for PCI DMA.  Unfortunately we can't know ahead of time
-	** whether GART support will actually be used, for now we
-	** can just key on an AGP device found in the system.
-	** We program the next pdir index after we stop w/ a key for
-	** the GART code to handshake on.
-	*/
-	for_each_pci_dev(device)	
-		agp_found |= pci_find_capability(device, PCI_CAP_ID_AGP);
-
-	if (agp_found && reserve_sba_gart) {
-		printk(KERN_INFO PFX "reserving %dMb of IOVA space at 0x%lx for agpgart\n",
-		      ioc->iov_size/2 >> 20, ioc->ibase + ioc->iov_size/2);
-		ioc->pdir_size /= 2;
-		((u64 *)ioc->pdir_base)[PDIR_INDEX(ioc->iov_size/2)] = ZX1_SBA_IOMMU_COOKIE;
-	}
-#ifdef FULL_VALID_PDIR
-	/*
-  	** Check to see if the spill page has been allocated, we don't need more than
-	** one across multiple SBAs.
-	*/
-	if (!prefetch_spill_page) {
-		char *spill_poison = "SBAIOMMU POISON";
-		int poison_size = 16;
-		void *poison_addr, *addr;
-
-		addr = (void *)__get_free_pages(GFP_KERNEL, get_order(iovp_size));
-		if (!addr)
-			panic(PFX "Couldn't allocate PDIR spill page\n");
-
-		poison_addr = addr;
-		for ( ; (u64) poison_addr < addr + iovp_size; poison_addr += poison_size)
-			memcpy(poison_addr, spill_poison, poison_size);
-
-		prefetch_spill_page = virt_to_phys(addr);
-
-		DBG_INIT("%s() prefetch spill addr: 0x%lx\n", __func__, prefetch_spill_page);
-	}
-	/*
-  	** Set all the PDIR entries valid w/ the spill page as the target
-	*/
-	for (index = 0 ; index < (ioc->pdir_size / PDIR_ENTRY_SIZE) ; index++)
-		((u64 *)ioc->pdir_base)[index] = (0x80000000000000FF | prefetch_spill_page);
-#endif
-
-	/* Clear I/O TLB of any possible entries */
-	WRITE_REG(ioc->ibase | (get_iovp_order(ioc->iov_size) + iovp_shift), ioc->ioc_hpa + IOC_PCOM);
-	READ_REG(ioc->ioc_hpa + IOC_PCOM);
-
-	/* Enable IOVA translation */
-	WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa + IOC_IBASE);
-	READ_REG(ioc->ioc_hpa + IOC_IBASE);
-}
-
-static void __init
-ioc_resource_init(struct ioc *ioc)
-{
-	spin_lock_init(&ioc->res_lock);
-#if DELAYED_RESOURCE_CNT > 0
-	spin_lock_init(&ioc->saved_lock);
-#endif
-
-	/* resource map size dictated by pdir_size */
-	ioc->res_size = ioc->pdir_size / PDIR_ENTRY_SIZE; /* entries */
-	ioc->res_size >>= 3;  /* convert bit count to byte count */
-	DBG_INIT("%s() res_size 0x%x\n", __func__, ioc->res_size);
-
-	ioc->res_map = (char *) __get_free_pages(GFP_KERNEL,
-						 get_order(ioc->res_size));
-	if (!ioc->res_map)
-		panic(PFX "Couldn't allocate resource map\n");
-
-	memset(ioc->res_map, 0, ioc->res_size);
-	/* next available IOVP - circular search */
-	ioc->res_hint = (unsigned long *) ioc->res_map;
-
-#ifdef ASSERT_PDIR_SANITY
-	/* Mark first bit busy - ie no IOVA 0 */
-	ioc->res_map[0] = 0x1;
-	ioc->pdir_base[0] = 0x8000000000000000ULL | ZX1_SBA_IOMMU_COOKIE;
-#endif
-#ifdef FULL_VALID_PDIR
-	/* Mark the last resource used so we don't prefetch beyond IOVA space */
-	ioc->res_map[ioc->res_size - 1] |= 0x80UL; /* res_map is chars */
-	ioc->pdir_base[(ioc->pdir_size / PDIR_ENTRY_SIZE) - 1] = (0x80000000000000FF
-							      | prefetch_spill_page);
-#endif
-
-	DBG_INIT("%s() res_map %x %p\n", __func__,
-		 ioc->res_size, (void *) ioc->res_map);
-}
-
-static void __init
-ioc_sac_init(struct ioc *ioc)
-{
-	struct pci_dev *sac = NULL;
-	struct pci_controller *controller = NULL;
-
-	/*
-	 * pci_alloc_coherent() must return a DMA address which is
-	 * SAC (single address cycle) addressable, so allocate a
-	 * pseudo-device to enforce that.
-	 */
-	sac = kzalloc(sizeof(*sac), GFP_KERNEL);
-	if (!sac)
-		panic(PFX "Couldn't allocate struct pci_dev");
-
-	controller = kzalloc(sizeof(*controller), GFP_KERNEL);
-	if (!controller)
-		panic(PFX "Couldn't allocate struct pci_controller");
-
-	controller->iommu = ioc;
-	sac->sysdata = controller;
-	sac->dma_mask = 0xFFFFFFFFUL;
-	sac->dev.bus = &pci_bus_type;
-	ioc->sac_only_dev = sac;
-}
-
-static void __init
-ioc_zx1_init(struct ioc *ioc)
-{
-	unsigned long rope_config;
-	unsigned int i;
-
-	if (ioc->rev < 0x20)
-		panic(PFX "IOC 2.0 or later required for IOMMU support\n");
-
-	/* 38 bit memory controller + extra bit for range displaced by MMIO */
-	ioc->dma_mask = (0x1UL << 39) - 1;
-
-	/*
-	** Clear ROPE(N)_CONFIG AO bit.
-	** Disables "NT Ordering" (~= !"Relaxed Ordering")
-	** Overrides bit 1 in DMA Hint Sets.
-	** Improves netperf UDP_STREAM by ~10% for tg3 on bcm5701.
-	*/
-	for (i=0; i<(8*8); i+=8) {
-		rope_config = READ_REG(ioc->ioc_hpa + IOC_ROPE0_CFG + i);
-		rope_config &= ~IOC_ROPE_AO;
-		WRITE_REG(rope_config, ioc->ioc_hpa + IOC_ROPE0_CFG + i);
-	}
-}
-
-typedef void (initfunc)(struct ioc *);
-
-struct ioc_iommu {
-	u32 func_id;
-	char *name;
-	initfunc *init;
-};
-
-static struct ioc_iommu ioc_iommu_info[] __initdata = {
-	{ ZX1_IOC_ID, "zx1", ioc_zx1_init },
-	{ ZX2_IOC_ID, "zx2", NULL },
-	{ SX1000_IOC_ID, "sx1000", NULL },
-	{ SX2000_IOC_ID, "sx2000", NULL },
-};
-
-static void __init ioc_init(unsigned long hpa, struct ioc *ioc)
-{
-	struct ioc_iommu *info;
-
-	ioc->next = ioc_list;
-	ioc_list = ioc;
-
-	ioc->ioc_hpa = ioremap(hpa, 0x1000);
-
-	ioc->func_id = READ_REG(ioc->ioc_hpa + IOC_FUNC_ID);
-	ioc->rev = READ_REG(ioc->ioc_hpa + IOC_FCLASS) & 0xFFUL;
-	ioc->dma_mask = 0xFFFFFFFFFFFFFFFFUL;	/* conservative */
-
-	for (info = ioc_iommu_info; info < ioc_iommu_info + ARRAY_SIZE(ioc_iommu_info); info++) {
-		if (ioc->func_id == info->func_id) {
-			ioc->name = info->name;
-			if (info->init)
-				(info->init)(ioc);
-		}
-	}
-
-	iovp_size = (1 << iovp_shift);
-	iovp_mask = ~(iovp_size - 1);
-
-	DBG_INIT("%s: PAGE_SIZE %ldK, iovp_size %ldK\n", __func__,
-		PAGE_SIZE >> 10, iovp_size >> 10);
-
-	if (!ioc->name) {
-		ioc->name = kmalloc(24, GFP_KERNEL);
-		if (ioc->name)
-			sprintf((char *) ioc->name, "Unknown (%04x:%04x)",
-				ioc->func_id & 0xFFFF, (ioc->func_id >> 16) & 0xFFFF);
-		else
-			ioc->name = "Unknown";
-	}
-
-	ioc_iova_init(ioc);
-	ioc_resource_init(ioc);
-	ioc_sac_init(ioc);
-
-	printk(KERN_INFO PFX
-		"%s %d.%d HPA 0x%lx IOVA space %dMb at 0x%lx\n",
-		ioc->name, (ioc->rev >> 4) & 0xF, ioc->rev & 0xF,
-		hpa, ioc->iov_size >> 20, ioc->ibase);
-}
-
-
-
-/**************************************************************************
-**
-**   SBA initialization code (HW and SW)
-**
-**   o identify SBA chip itself
-**   o FIXME: initialize DMA hints for reasonable defaults
-**
-**************************************************************************/
-
-#ifdef CONFIG_PROC_FS
-static void *
-ioc_start(struct seq_file *s, loff_t *pos)
-{
-	struct ioc *ioc;
-	loff_t n = *pos;
-
-	for (ioc = ioc_list; ioc; ioc = ioc->next)
-		if (!n--)
-			return ioc;
-
-	return NULL;
-}
-
-static void *
-ioc_next(struct seq_file *s, void *v, loff_t *pos)
-{
-	struct ioc *ioc = v;
-
-	++*pos;
-	return ioc->next;
-}
-
-static void
-ioc_stop(struct seq_file *s, void *v)
-{
-}
-
-static int
-ioc_show(struct seq_file *s, void *v)
-{
-	struct ioc *ioc = v;
-	unsigned long *res_ptr = (unsigned long *)ioc->res_map;
-	int i, used = 0;
-
-	seq_printf(s, "Hewlett Packard %s IOC rev %d.%d\n",
-		ioc->name, ((ioc->rev >> 4) & 0xF), (ioc->rev & 0xF));
-#ifdef CONFIG_NUMA
-	if (ioc->node != NUMA_NO_NODE)
-		seq_printf(s, "NUMA node       : %d\n", ioc->node);
-#endif
-	seq_printf(s, "IOVA size       : %ld MB\n", ((ioc->pdir_size >> 3) * iovp_size)/(1024*1024));
-	seq_printf(s, "IOVA page size  : %ld kb\n", iovp_size/1024);
-
-	for (i = 0; i < (ioc->res_size / sizeof(unsigned long)); ++i, ++res_ptr)
-		used += hweight64(*res_ptr);
-
-	seq_printf(s, "PDIR size       : %d entries\n", ioc->pdir_size >> 3);
-	seq_printf(s, "PDIR used       : %d entries\n", used);
-
-#ifdef PDIR_SEARCH_TIMING
-	{
-		unsigned long i = 0, avg = 0, min, max;
-		min = max = ioc->avg_search[0];
-		for (i = 0; i < SBA_SEARCH_SAMPLE; i++) {
-			avg += ioc->avg_search[i];
-			if (ioc->avg_search[i] > max) max = ioc->avg_search[i];
-			if (ioc->avg_search[i] < min) min = ioc->avg_search[i];
-		}
-		avg /= SBA_SEARCH_SAMPLE;
-		seq_printf(s, "Bitmap search   : %ld/%ld/%ld (min/avg/max CPU Cycles/IOVA page)\n",
-		           min, avg, max);
-	}
-#endif
-#ifndef ALLOW_IOV_BYPASS
-	 seq_printf(s, "IOVA bypass disabled\n");
-#endif
-	return 0;
-}
-
-static const struct seq_operations ioc_seq_ops = {
-	.start = ioc_start,
-	.next  = ioc_next,
-	.stop  = ioc_stop,
-	.show  = ioc_show
-};
-
-static void __init
-ioc_proc_init(void)
-{
-	struct proc_dir_entry *dir;
-
-	dir = proc_mkdir("bus/mckinley", NULL);
-	if (!dir)
-		return;
-
-	proc_create_seq(ioc_list->name, 0, dir, &ioc_seq_ops);
-}
-#endif
-
-static void
-sba_connect_bus(struct pci_bus *bus)
-{
-	acpi_handle handle, parent;
-	acpi_status status;
-	struct ioc *ioc;
-
-	if (!PCI_CONTROLLER(bus))
-		panic(PFX "no sysdata on bus %d!\n", bus->number);
-
-	if (PCI_CONTROLLER(bus)->iommu)
-		return;
-
-	handle = acpi_device_handle(PCI_CONTROLLER(bus)->companion);
-	if (!handle)
-		return;
-
-	/*
-	 * The IOC scope encloses PCI root bridges in the ACPI
-	 * namespace, so work our way out until we find an IOC we
-	 * claimed previously.
-	 */
-	do {
-		for (ioc = ioc_list; ioc; ioc = ioc->next)
-			if (ioc->handle == handle) {
-				PCI_CONTROLLER(bus)->iommu = ioc;
-				return;
-			}
-
-		status = acpi_get_parent(handle, &parent);
-		handle = parent;
-	} while (ACPI_SUCCESS(status));
-
-	printk(KERN_WARNING "No IOC for PCI Bus %04x:%02x in ACPI\n", pci_domain_nr(bus), bus->number);
-}
-
-static void __init
-sba_map_ioc_to_node(struct ioc *ioc, acpi_handle handle)
-{
-#ifdef CONFIG_NUMA
-	unsigned int node;
-
-	node = acpi_get_node(handle);
-	if (node != NUMA_NO_NODE && !node_online(node))
-		node = NUMA_NO_NODE;
-
-	ioc->node = node;
-#endif
-}
-
-static void __init acpi_sba_ioc_add(struct ioc *ioc)
-{
-	acpi_handle handle = ioc->handle;
-	acpi_status status;
-	u64 hpa, length;
-	struct acpi_device_info *adi;
-
-	ioc_found = ioc->next;
-	status = hp_acpi_csr_space(handle, &hpa, &length);
-	if (ACPI_FAILURE(status))
-		goto err;
-
-	status = acpi_get_object_info(handle, &adi);
-	if (ACPI_FAILURE(status))
-		goto err;
-
-	/*
-	 * For HWP0001, only SBA appears in ACPI namespace.  It encloses the PCI
-	 * root bridges, and its CSR space includes the IOC function.
-	 */
-	if (strncmp("HWP0001", adi->hardware_id.string, 7) == 0) {
-		hpa += ZX1_IOC_OFFSET;
-		/* zx1 based systems default to kernel page size iommu pages */
-		if (!iovp_shift)
-			iovp_shift = min(PAGE_SHIFT, 16);
-	}
-	kfree(adi);
-
-	/*
-	 * default anything not caught above or specified on cmdline to 4k
-	 * iommu page size
-	 */
-	if (!iovp_shift)
-		iovp_shift = 12;
-
-	ioc_init(hpa, ioc);
-	/* setup NUMA node association */
-	sba_map_ioc_to_node(ioc, handle);
-	return;
-
- err:
-	kfree(ioc);
-}
-
-static const struct acpi_device_id hp_ioc_iommu_device_ids[] = {
-	{"HWP0001", 0},
-	{"HWP0004", 0},
-	{"", 0},
-};
-
-static int acpi_sba_ioc_attach(struct acpi_device *device,
-			       const struct acpi_device_id *not_used)
-{
-	struct ioc *ioc;
-
-	ioc = kzalloc(sizeof(*ioc), GFP_KERNEL);
-	if (!ioc)
-		return -ENOMEM;
-
-	ioc->next = ioc_found;
-	ioc_found = ioc;
-	ioc->handle = device->handle;
-	return 1;
-}
-
-
-static struct acpi_scan_handler acpi_sba_ioc_handler = {
-	.ids	= hp_ioc_iommu_device_ids,
-	.attach	= acpi_sba_ioc_attach,
-};
-
-static int __init acpi_sba_ioc_init_acpi(void)
-{
-	return acpi_scan_add_handler(&acpi_sba_ioc_handler);
-}
-/* This has to run before acpi_scan_init(). */
-arch_initcall(acpi_sba_ioc_init_acpi);
-
-static int sba_dma_supported (struct device *dev, u64 mask)
-{
-	/* make sure it's at least 32bit capable */
-	return ((mask & 0xFFFFFFFFUL) == 0xFFFFFFFFUL);
-}
-
-static const struct dma_map_ops sba_dma_ops = {
-	.alloc			= sba_alloc_coherent,
-	.free			= sba_free_coherent,
-	.map_page		= sba_map_page,
-	.unmap_page		= sba_unmap_page,
-	.map_sg			= sba_map_sg_attrs,
-	.unmap_sg		= sba_unmap_sg_attrs,
-	.dma_supported		= sba_dma_supported,
-	.mmap			= dma_common_mmap,
-	.get_sgtable		= dma_common_get_sgtable,
-	.alloc_pages		= dma_common_alloc_pages,
-	.free_pages		= dma_common_free_pages,
-};
-
-static int __init
-sba_init(void)
-{
-	/*
-	 * If we are booting a kdump kernel, the sba_iommu will cause devices
-	 * that were not shutdown properly to MCA as soon as they are turned
-	 * back on.  Our only option for a successful kdump kernel boot is to
-	 * use swiotlb.
-	 */
-	if (is_kdump_kernel())
-		return 0;
-
-	/*
-	 * ioc_found should be populated by the acpi_sba_ioc_handler's .attach()
-	 * routine, but that only happens if acpi_scan_init() has already run.
-	 */
-	while (ioc_found)
-		acpi_sba_ioc_add(ioc_found);
-
-	if (!ioc_list)
-		return 0;
-
-	{
-		struct pci_bus *b = NULL;
-		while ((b = pci_find_next_bus(b)) != NULL)
-			sba_connect_bus(b);
-	}
-
-	/* no need for swiotlb with the iommu */
-	swiotlb_exit();
-	dma_ops = &sba_dma_ops;
-
-#ifdef CONFIG_PROC_FS
-	ioc_proc_init();
-#endif
-	return 0;
-}
-
-subsys_initcall(sba_init); /* must be initialized after ACPI etc., but before any drivers... */
-
-static int __init
-nosbagart(char *str)
-{
-	reserve_sba_gart = 0;
-	return 1;
-}
-
-__setup("nosbagart", nosbagart);
-
-static int __init
-sba_page_override(char *str)
-{
-	unsigned long page_size;
-
-	page_size = memparse(str, &str);
-	switch (page_size) {
-		case 4096:
-		case 8192:
-		case 16384:
-		case 65536:
-			iovp_shift = ffs(page_size) - 1;
-			break;
-		default:
-			printk("%s: unknown/unsupported iommu page size %ld\n",
-			       __func__, page_size);
-	}
-
-	return 1;
-}
-
-__setup("sbapagesize=",sba_page_override);