# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1178504985 21600
# Node ID e60051ca408f0a42cc609ddae80a89ba400061e3
# Parent 63263d715d4309e7bccdd43d0f9c5c49be8c52ac
[IA64] Add iommu drivers to sparse tree
These will be paravirtualized in upcoming commits. We're copying
lib/swiotlb.c into arch/ia64/xen/swiotlb.c simply for convenience.
Changes should be merged back into lib/swiotlb.c once Xen support
merges into Linux.
Signed-off-by: Alex Williamson <alex.williamson@xxxxxx>
---
linux-2.6-xen-sparse/arch/ia64/hp/common/sba_iommu.c | 2133 +++++++++++++++++++
linux-2.6-xen-sparse/arch/ia64/xen/swiotlb.c | 803 +++++++
2 files changed, 2936 insertions(+)
diff -r 63263d715d43 -r e60051ca408f
linux-2.6-xen-sparse/arch/ia64/hp/common/sba_iommu.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/linux-2.6-xen-sparse/arch/ia64/hp/common/sba_iommu.c Sun May 06
20:29:45 2007 -0600
@@ -0,0 +1,2133 @@
+/*
+** 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 program is free software; you can redistribute it and/or modify
+** it under the terms of the GNU General Public License as published by
+** the Free Software Foundation; either version 2 of the License, or
+** (at your option) any later version.
+**
+**
+** 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 <asm/delay.h> /* ia64_get_itc() */
+#include <asm/io.h>
+#include <asm/page.h> /* PAGE_OFFSET */
+#include <asm/dma.h>
+#include <asm/system.h> /* wmb() */
+
+#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 agressive, 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;
+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) (page_address((sg)->page) + (sg)->offset)
+
+#ifdef FULL_VALID_PDIR
+static u64 prefetch_spill_page;
+#endif
+
+#ifdef CONFIG_PCI
+# define GET_IOC(dev) (((dev)->bus == &pci_bus_type)
\
+ ? ((struct ioc *)
PCI_CONTROLLER(to_pci_dev(dev))->iommu) : NULL)
+#else
+# define GET_IOC(dev) NULL
+#endif
+
+/*
+** DMA_CHUNK_SIZE is used by the SCSI mid-layer to break up
+** (or rather not merge) DMA's into managable chunks.
+** On parisc, this is more of the software/tuning constraint
+** rather than the HW. I/O MMU allocation alogorithms can be
+** faster with smaller size is (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++;
+ }
+}
+
+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++;
+ }
+}
+
+#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;
+}
+
+/**
+ * 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, 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;
+
+ ASSERT(((unsigned long) ioc->res_hint & (sizeof(unsigned long) - 1UL))
== 0);
+ ASSERT(res_ptr < res_end);
+
+ 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 = ((unsigned long)res_ptr - (unsigned
long)ioc->res_map);
+ pide <<= 3; /* convert to bit address */
+ pide += 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", __FUNCTION__, 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) {
+ if(0 == ((*res_ptr) & mask)) {
+ *res_ptr |= mask; /* mark resources
busy! */
+ pide = ((unsigned long)res_ptr -
(unsigned long)ioc->res_map);
+ pide <<= 3; /* convert to bit
address */
+ pide += bitshiftcnt;
+ 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++) {
+ 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 = ((unsigned long)res_ptr - (unsigned
long)ioc->res_map);
+ pide <<= 3; /* convert to bit address */
+ 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, 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, pages_needed, 1);
+ if (unlikely(pide >= (ioc->res_size << 3))) {
+ pide = sba_search_bitmap(ioc, 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, pages_needed, 0);
+ if (unlikely(pide >= (ioc->res_size << 3)))
+ panic(__FILE__ ": I/O MMU @ %p is out of
mapping resources\n",
+ ioc->ioc_hpa);
+#else
+ panic(__FILE__ ": I/O MMU @ %p is out of mapping
resources\n",
+ ioc->ioc_hpa);
+#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",
+ __FUNCTION__, 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", __FUNCTION__,
(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)
+{
+ unsigned long pg_addr, end;
+
+ pg_addr = PAGE_ALIGN((unsigned long) addr);
+ end = (unsigned long) addr + size;
+ while (pg_addr + PAGE_SIZE <= end) {
+ struct page *page = virt_to_page((void *)pg_addr);
+ set_bit(PG_arch_1, &page->flags);
+ pg_addr += PAGE_SIZE;
+ }
+}
+#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_single - map one buffer and return IOVA for DMA
+ * @dev: instance of PCI owned by the driver that's asking.
+ * @addr: driver buffer to map.
+ * @size: number of bytes to map in driver buffer.
+ * @dir: R/W or both.
+ *
+ * See Documentation/DMA-mapping.txt
+ */
+dma_addr_t
+sba_map_single(struct device *dev, void *addr, size_t size, int dir)
+{
+ struct ioc *ioc;
+ 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_single() 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_single()"))
+ panic("Sanity check failed");
+ spin_unlock_irqrestore(&ioc->res_lock, flags);
+#endif
+
+ pide = sba_alloc_range(ioc, size);
+
+ iovp = (dma_addr_t) pide << iovp_shift;
+
+ DBG_RUN("%s() 0x%p -> 0x%lx\n",
+ __FUNCTION__, 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_single()");
+ 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_single - 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.
+ *
+ * See Documentation/DMA-mapping.txt
+ */
+void sba_unmap_single(struct device *dev, dma_addr_t iova, size_t size, int
dir)
+{
+ 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_single() 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",
+ __FUNCTION__, (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/DMA-mapping.txt
+ */
+void *
+sba_alloc_coherent (struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t flags)
+{
+ struct ioc *ioc;
+ void *addr;
+
+ ioc = GET_IOC(dev);
+ ASSERT(ioc);
+
+#ifdef CONFIG_NUMA
+ {
+ struct page *page;
+ page = alloc_pages_node(ioc->node == MAX_NUMNODES ?
+ numa_node_id() : ioc->node, flags,
+ get_order(size));
+
+ if (unlikely(!page))
+ return NULL;
+
+ addr = page_address(page);
+ }
+#else
+ addr = (void *) __get_free_pages(flags, get_order(size));
+#endif
+ if (unlikely(!addr))
+ return NULL;
+
+ memset(addr, 0, size);
+ *dma_handle = virt_to_phys(addr);
+
+#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_single(&ioc->sac_only_dev->dev, addr, size, 0);
+
+ 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/DMA-mapping.txt
+ */
+void sba_free_coherent (struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle)
+{
+ sba_unmap_single(dev, dma_handle, size, 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;
+
+ dma_sg--;
+ 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;
+ 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++;
+ }
+ /* 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 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;
+
+ 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++;
+
+ /* 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;
+
+ /*
+ ** 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 contigous.
+ ** 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);
+ dma_sg->dma_address = (dma_addr_t) (PIDE_FLAG
+ | (sba_alloc_range(ioc, dma_len) << iovp_shift)
+ | dma_offset);
+ n_mappings++;
+ }
+
+ return n_mappings;
+}
+
+
+/**
+ * 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.
+ *
+ * See Documentation/DMA-mapping.txt
+ */
+int sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents, int
dir)
+{
+ 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", __FUNCTION__, 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 (sg = sglist ; filled < nents ; filled++, sg++){
+ 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_single(dev,
sba_sg_address(sglist), sglist->length, dir);
+ return 1;
+ }
+
+#ifdef ASSERT_PDIR_SANITY
+ spin_lock_irqsave(&ioc->res_lock, flags);
+ if (sba_check_pdir(ioc,"Check before sba_map_sg()"))
+ {
+ sba_dump_sg(ioc, sglist, nents);
+ panic("Check before sba_map_sg()");
+ }
+ 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, sglist, nents);
+
+ /*
+ ** 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()"))
+ {
+ sba_dump_sg(ioc, sglist, nents);
+ panic("Check after sba_map_sg()\n");
+ }
+ spin_unlock_irqrestore(&ioc->res_lock, flags);
+#endif
+
+ ASSERT(coalesced == filled);
+ DBG_RUN_SG("%s() DONE %d mappings\n", __FUNCTION__, filled);
+
+ return filled;
+}
+
+
+/**
+ * sba_unmap_sg - 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.
+ *
+ * See Documentation/DMA-mapping.txt
+ */
+void sba_unmap_sg (struct device *dev, struct scatterlist *sglist, int nents,
int dir)
+{
+#ifdef ASSERT_PDIR_SANITY
+ struct ioc *ioc;
+ unsigned long flags;
+#endif
+
+ DBG_RUN_SG("%s() START %d entries, %p,%x\n",
+ __FUNCTION__, 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()");
+ spin_unlock_irqrestore(&ioc->res_lock, flags);
+#endif
+
+ while (nents && sglist->dma_length) {
+
+ sba_unmap_single(dev, sglist->dma_address, sglist->dma_length,
dir);
+ sglist++;
+ nents--;
+ }
+
+ DBG_RUN_SG("%s() DONE (nents %d)\n", __FUNCTION__, nents);
+
+#ifdef ASSERT_PDIR_SANITY
+ spin_lock_irqsave(&ioc->res_lock, flags);
+ sba_check_pdir(ioc,"Check after sba_unmap_sg()");
+ spin_unlock_irqrestore(&ioc->res_lock, flags);
+#endif
+
+}
+
+/**************************************************************
+*
+* Initialization and claim
+*
+***************************************************************/
+
+static void __init
+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",
+ __FUNCTION__, 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", __FUNCTION__,
+ 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", __FUNCTION__,
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", __FUNCTION__, 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", __FUNCTION__,
+ 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 = kmalloc(sizeof(*sac), GFP_KERNEL);
+ if (!sac)
+ panic(PFX "Couldn't allocate struct pci_dev");
+ memset(sac, 0, sizeof(*sac));
+
+ controller = kmalloc(sizeof(*controller), GFP_KERNEL);
+ if (!controller)
+ panic(PFX "Couldn't allocate struct pci_controller");
+ memset(controller, 0, sizeof(*controller));
+
+ controller->iommu = ioc;
+ sac->sysdata = controller;
+ sac->dma_mask = 0xFFFFFFFFUL;
+#ifdef CONFIG_PCI
+ sac->dev.bus = &pci_bus_type;
+#endif
+ 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 struct ioc * __init
+ioc_init(u64 hpa, void *handle)
+{
+ struct ioc *ioc;
+ struct ioc_iommu *info;
+
+ ioc = kmalloc(sizeof(*ioc), GFP_KERNEL);
+ if (!ioc)
+ return NULL;
+
+ memset(ioc, 0, sizeof(*ioc));
+
+ ioc->next = ioc_list;
+ ioc_list = ioc;
+
+ ioc->handle = handle;
+ 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", __FUNCTION__,
+ 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);
+
+ if ((long) ~iovp_mask > (long) ia64_max_iommu_merge_mask)
+ ia64_max_iommu_merge_mask = ~iovp_mask;
+
+ 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);
+
+ return ioc;
+}
+
+
+
+/**************************************************************************
+**
+** 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 != MAX_NUMNODES)
+ 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 struct seq_operations ioc_seq_ops = {
+ .start = ioc_start,
+ .next = ioc_next,
+ .stop = ioc_stop,
+ .show = ioc_show
+};
+
+static int
+ioc_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &ioc_seq_ops);
+}
+
+static struct file_operations ioc_fops = {
+ .open = ioc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release
+};
+
+static void __init
+ioc_proc_init(void)
+{
+ struct proc_dir_entry *dir, *entry;
+
+ dir = proc_mkdir("bus/mckinley", NULL);
+ if (!dir)
+ return;
+
+ entry = create_proc_entry(ioc_list->name, 0, dir);
+ if (entry)
+ entry->proc_fops = &ioc_fops;
+}
+#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 = PCI_CONTROLLER(bus)->acpi_handle;
+ 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);
+}
+
+#ifdef CONFIG_NUMA
+static void __init
+sba_map_ioc_to_node(struct ioc *ioc, acpi_handle handle)
+{
+ unsigned int node;
+ int pxm;
+
+ ioc->node = MAX_NUMNODES;
+
+ pxm = acpi_get_pxm(handle);
+
+ if (pxm < 0)
+ return;
+
+ node = pxm_to_node(pxm);
+
+ if (node >= MAX_NUMNODES || !node_online(node))
+ return;
+
+ ioc->node = node;
+ return;
+}
+#else
+#define sba_map_ioc_to_node(ioc, handle)
+#endif
+
+static int __init
+acpi_sba_ioc_add(struct acpi_device *device)
+{
+ struct ioc *ioc;
+ acpi_status status;
+ u64 hpa, length;
+ struct acpi_buffer buffer;
+ struct acpi_device_info *dev_info;
+
+ status = hp_acpi_csr_space(device->handle, &hpa, &length);
+ if (ACPI_FAILURE(status))
+ return 1;
+
+ buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
+ status = acpi_get_object_info(device->handle, &buffer);
+ if (ACPI_FAILURE(status))
+ return 1;
+ dev_info = buffer.pointer;
+
+ /*
+ * 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", dev_info->hardware_id.value, 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(dev_info);
+
+ /*
+ * default anything not caught above or specified on cmdline to 4k
+ * iommu page size
+ */
+ if (!iovp_shift)
+ iovp_shift = 12;
+
+ ioc = ioc_init(hpa, device->handle);
+ if (!ioc)
+ return 1;
+
+ /* setup NUMA node association */
+ sba_map_ioc_to_node(ioc, device->handle);
+ return 0;
+}
+
+static struct acpi_driver acpi_sba_ioc_driver = {
+ .name = "IOC IOMMU Driver",
+ .ids = "HWP0001,HWP0004",
+ .ops = {
+ .add = acpi_sba_ioc_add,
+ },
+};
+
+static int __init
+sba_init(void)
+{
+ if (!ia64_platform_is("hpzx1") && !ia64_platform_is("hpzx1_swiotlb"))
+ return 0;
+
+ acpi_bus_register_driver(&acpi_sba_ioc_driver);
+ if (!ioc_list) {
+#ifdef CONFIG_IA64_GENERIC
+ extern int swiotlb_late_init_with_default_size (size_t size);
+
+ /*
+ * If we didn't find something sba_iommu can claim, we
+ * need to setup the swiotlb and switch to the dig machvec.
+ */
+ if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
+ panic("Unable to find SBA IOMMU or initialize "
+ "software I/O TLB: Try machvec=dig boot option");
+ machvec_init("dig");
+#else
+ panic("Unable to find SBA IOMMU: Try a generic or DIG kernel");
+#endif
+ 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
+
+#ifdef CONFIG_PCI
+ {
+ struct pci_bus *b = NULL;
+ while ((b = pci_find_next_bus(b)) != NULL)
+ sba_connect_bus(b);
+ }
+#endif
+
+#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;
+}
+
+int
+sba_dma_supported (struct device *dev, u64 mask)
+{
+ /* make sure it's at least 32bit capable */
+ return ((mask & 0xFFFFFFFFUL) == 0xFFFFFFFFUL);
+}
+
+int
+sba_dma_mapping_error (dma_addr_t dma_addr)
+{
+ return 0;
+}
+
+__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",
+ __FUNCTION__, page_size);
+ }
+
+ return 1;
+}
+
+__setup("sbapagesize=",sba_page_override);
+
+EXPORT_SYMBOL(sba_dma_mapping_error);
+EXPORT_SYMBOL(sba_map_single);
+EXPORT_SYMBOL(sba_unmap_single);
+EXPORT_SYMBOL(sba_map_sg);
+EXPORT_SYMBOL(sba_unmap_sg);
+EXPORT_SYMBOL(sba_dma_supported);
+EXPORT_SYMBOL(sba_alloc_coherent);
+EXPORT_SYMBOL(sba_free_coherent);
diff -r 63263d715d43 -r e60051ca408f
linux-2.6-xen-sparse/arch/ia64/xen/swiotlb.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/linux-2.6-xen-sparse/arch/ia64/xen/swiotlb.c Sun May 06 20:29:45
2007 -0600
@@ -0,0 +1,803 @@
+/*
+ * Dynamic DMA mapping support.
+ *
+ * This implementation is for IA-64 and EM64T platforms that do not support
+ * I/O TLBs (aka DMA address translation hardware).
+ * Copyright (C) 2000 Asit Mallick <Asit.K.Mallick@xxxxxxxxx>
+ * Copyright (C) 2000 Goutham Rao <goutham.rao@xxxxxxxxx>
+ * Copyright (C) 2000, 2003 Hewlett-Packard Co
+ * David Mosberger-Tang <davidm@xxxxxxxxxx>
+ *
+ * 03/05/07 davidm Switch from PCI-DMA to generic device DMA API.
+ * 00/12/13 davidm Rename to swiotlb.c and add mark_clean() to avoid
+ * unnecessary i-cache flushing.
+ * 04/07/.. ak Better overflow handling. Assorted fixes.
+ * 05/09/10 linville Add support for syncing ranges, support syncing for
+ * DMA_BIDIRECTIONAL mappings, miscellaneous cleanup.
+ */
+
+#include <linux/cache.h>
+#include <linux/dma-mapping.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ctype.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/scatterlist.h>
+
+#include <linux/init.h>
+#include <linux/bootmem.h>
+
+#define OFFSET(val,align) ((unsigned long) \
+ ( (val) & ( (align) - 1)))
+
+#define SG_ENT_VIRT_ADDRESS(sg) (page_address((sg)->page) +
(sg)->offset)
+#define SG_ENT_PHYS_ADDRESS(SG) virt_to_phys(SG_ENT_VIRT_ADDRESS(SG))
+
+/*
+ * Maximum allowable number of contiguous slabs to map,
+ * must be a power of 2. What is the appropriate value ?
+ * The complexity of {map,unmap}_single is linearly dependent on this value.
+ */
+#define IO_TLB_SEGSIZE 128
+
+/*
+ * log of the size of each IO TLB slab. The number of slabs is command line
+ * controllable.
+ */
+#define IO_TLB_SHIFT 11
+
+#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
+
+/*
+ * Minimum IO TLB size to bother booting with. Systems with mainly
+ * 64bit capable cards will only lightly use the swiotlb. If we can't
+ * allocate a contiguous 1MB, we're probably in trouble anyway.
+ */
+#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
+
+/*
+ * Enumeration for sync targets
+ */
+enum dma_sync_target {
+ SYNC_FOR_CPU = 0,
+ SYNC_FOR_DEVICE = 1,
+};
+
+int swiotlb_force;
+
+/*
+ * Used to do a quick range check in swiotlb_unmap_single and
+ * swiotlb_sync_single_*, to see if the memory was in fact allocated by this
+ * API.
+ */
+static char *io_tlb_start, *io_tlb_end;
+
+/*
+ * The number of IO TLB blocks (in groups of 64) betweeen io_tlb_start and
+ * io_tlb_end. This is command line adjustable via setup_io_tlb_npages.
+ */
+static unsigned long io_tlb_nslabs;
+
+/*
+ * When the IOMMU overflows we return a fallback buffer. This sets the size.
+ */
+static unsigned long io_tlb_overflow = 32*1024;
+
+void *io_tlb_overflow_buffer;
+
+/*
+ * This is a free list describing the number of free entries available from
+ * each index
+ */
+static unsigned int *io_tlb_list;
+static unsigned int io_tlb_index;
+
+/*
+ * We need to save away the original address corresponding to a mapped entry
+ * for the sync operations.
+ */
+static unsigned char **io_tlb_orig_addr;
+
+/*
+ * Protect the above data structures in the map and unmap calls
+ */
+static DEFINE_SPINLOCK(io_tlb_lock);
+
+static int __init
+setup_io_tlb_npages(char *str)
+{
+ if (isdigit(*str)) {
+ io_tlb_nslabs = simple_strtoul(str, &str, 0);
+ /* avoid tail segment of size < IO_TLB_SEGSIZE */
+ io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
+ }
+ if (*str == ',')
+ ++str;
+ if (!strcmp(str, "force"))
+ swiotlb_force = 1;
+ return 1;
+}
+__setup("swiotlb=", setup_io_tlb_npages);
+/* make io_tlb_overflow tunable too? */
+
+/*
+ * Statically reserve bounce buffer space and initialize bounce buffer data
+ * structures for the software IO TLB used to implement the DMA API.
+ */
+void
+swiotlb_init_with_default_size (size_t default_size)
+{
+ unsigned long i;
+
+ if (!io_tlb_nslabs) {
+ io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
+ io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
+ }
+
+ /*
+ * Get IO TLB memory from the low pages
+ */
+ io_tlb_start = alloc_bootmem_low_pages(io_tlb_nslabs * (1 <<
IO_TLB_SHIFT));
+ if (!io_tlb_start)
+ panic("Cannot allocate SWIOTLB buffer");
+ io_tlb_end = io_tlb_start + io_tlb_nslabs * (1 << IO_TLB_SHIFT);
+
+ /*
+ * Allocate and initialize the free list array. This array is used
+ * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
+ * between io_tlb_start and io_tlb_end.
+ */
+ io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int));
+ for (i = 0; i < io_tlb_nslabs; i++)
+ io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
+ io_tlb_index = 0;
+ io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(char *));
+
+ /*
+ * Get the overflow emergency buffer
+ */
+ io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
+ printk(KERN_INFO "Placing software IO TLB between 0x%lx - 0x%lx\n",
+ virt_to_phys(io_tlb_start), virt_to_phys(io_tlb_end));
+}
+
+void
+swiotlb_init (void)
+{
+ swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */
+}
+
+/*
+ * Systems with larger DMA zones (those that don't support ISA) can
+ * initialize the swiotlb later using the slab allocator if needed.
+ * This should be just like above, but with some error catching.
+ */
+int
+swiotlb_late_init_with_default_size (size_t default_size)
+{
+ unsigned long i, req_nslabs = io_tlb_nslabs;
+ unsigned int order;
+
+ if (!io_tlb_nslabs) {
+ io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
+ io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
+ }
+
+ /*
+ * Get IO TLB memory from the low pages
+ */
+ order = get_order(io_tlb_nslabs * (1 << IO_TLB_SHIFT));
+ io_tlb_nslabs = SLABS_PER_PAGE << order;
+
+ while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
+ io_tlb_start = (char *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
+ order);
+ if (io_tlb_start)
+ break;
+ order--;
+ }
+
+ if (!io_tlb_start)
+ goto cleanup1;
+
+ if (order != get_order(io_tlb_nslabs * (1 << IO_TLB_SHIFT))) {
+ printk(KERN_WARNING "Warning: only able to allocate %ld MB "
+ "for software IO TLB\n", (PAGE_SIZE << order) >> 20);
+ io_tlb_nslabs = SLABS_PER_PAGE << order;
+ }
+ io_tlb_end = io_tlb_start + io_tlb_nslabs * (1 << IO_TLB_SHIFT);
+ memset(io_tlb_start, 0, io_tlb_nslabs * (1 << IO_TLB_SHIFT));
+
+ /*
+ * Allocate and initialize the free list array. This array is used
+ * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
+ * between io_tlb_start and io_tlb_end.
+ */
+ io_tlb_list = (unsigned int *)__get_free_pages(GFP_KERNEL,
+ get_order(io_tlb_nslabs * sizeof(int)));
+ if (!io_tlb_list)
+ goto cleanup2;
+
+ for (i = 0; i < io_tlb_nslabs; i++)
+ io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
+ io_tlb_index = 0;
+
+ io_tlb_orig_addr = (unsigned char **)__get_free_pages(GFP_KERNEL,
+ get_order(io_tlb_nslabs * sizeof(char *)));
+ if (!io_tlb_orig_addr)
+ goto cleanup3;
+
+ memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(char *));
+
+ /*
+ * Get the overflow emergency buffer
+ */
+ io_tlb_overflow_buffer = (void *)__get_free_pages(GFP_DMA,
+ get_order(io_tlb_overflow));
+ if (!io_tlb_overflow_buffer)
+ goto cleanup4;
+
+ printk(KERN_INFO "Placing %ldMB software IO TLB between 0x%lx - "
+ "0x%lx\n", (io_tlb_nslabs * (1 << IO_TLB_SHIFT)) >> 20,
+ virt_to_phys(io_tlb_start), virt_to_phys(io_tlb_end));
+
+ return 0;
+
+cleanup4:
+ free_pages((unsigned long)io_tlb_orig_addr, get_order(io_tlb_nslabs *
+ sizeof(char *)));
+ io_tlb_orig_addr = NULL;
+cleanup3:
+ free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
+ sizeof(int)));
+ io_tlb_list = NULL;
+ io_tlb_end = NULL;
+cleanup2:
+ free_pages((unsigned long)io_tlb_start, order);
+ io_tlb_start = NULL;
+cleanup1:
+ io_tlb_nslabs = req_nslabs;
+ return -ENOMEM;
+}
+
+static inline int
+address_needs_mapping(struct device *hwdev, dma_addr_t addr)
+{
+ dma_addr_t mask = 0xffffffff;
+ /* If the device has a mask, use it, otherwise default to 32 bits */
+ if (hwdev && hwdev->dma_mask)
+ mask = *hwdev->dma_mask;
+ return (addr & ~mask) != 0;
+}
+
+/*
+ * Allocates bounce buffer and returns its kernel virtual address.
+ */
+static void *
+map_single(struct device *hwdev, char *buffer, size_t size, int dir)
+{
+ unsigned long flags;
+ char *dma_addr;
+ unsigned int nslots, stride, index, wrap;
+ int i;
+
+ /*
+ * For mappings greater than a page, we limit the stride (and
+ * hence alignment) to a page size.
+ */
+ nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
+ if (size > PAGE_SIZE)
+ stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT));
+ else
+ stride = 1;
+
+ BUG_ON(!nslots);
+
+ /*
+ * Find suitable number of IO TLB entries size that will fit this
+ * request and allocate a buffer from that IO TLB pool.
+ */
+ spin_lock_irqsave(&io_tlb_lock, flags);
+ {
+ wrap = index = ALIGN(io_tlb_index, stride);
+
+ if (index >= io_tlb_nslabs)
+ wrap = index = 0;
+
+ do {
+ /*
+ * If we find a slot that indicates we have 'nslots'
+ * number of contiguous buffers, we allocate the
+ * buffers from that slot and mark the entries as '0'
+ * indicating unavailable.
+ */
+ if (io_tlb_list[index] >= nslots) {
+ int count = 0;
+
+ for (i = index; i < (int) (index + nslots); i++)
+ io_tlb_list[i] = 0;
+ for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE)
!= IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--)
+ io_tlb_list[i] = ++count;
+ dma_addr = io_tlb_start + (index <<
IO_TLB_SHIFT);
+
+ /*
+ * Update the indices to avoid searching in
+ * the next round.
+ */
+ io_tlb_index = ((index + nslots) < io_tlb_nslabs
+ ? (index + nslots) : 0);
+
+ goto found;
+ }
+ index += stride;
+ if (index >= io_tlb_nslabs)
+ index = 0;
+ } while (index != wrap);
+
+ spin_unlock_irqrestore(&io_tlb_lock, flags);
+ return NULL;
+ }
+ found:
+ spin_unlock_irqrestore(&io_tlb_lock, flags);
+
+ /*
+ * Save away the mapping from the original address to the DMA address.
+ * This is needed when we sync the memory. Then we sync the buffer if
+ * needed.
+ */
+ io_tlb_orig_addr[index] = buffer;
+ if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
+ memcpy(dma_addr, buffer, size);
+
+ return dma_addr;
+}
+
+/*
+ * dma_addr is the kernel virtual address of the bounce buffer to unmap.
+ */
+static void
+unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir)
+{
+ unsigned long flags;
+ int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
+ int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
+ char *buffer = io_tlb_orig_addr[index];
+
+ /*
+ * First, sync the memory before unmapping the entry
+ */
+ if (buffer && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
+ /*
+ * bounce... copy the data back into the original buffer * and
+ * delete the bounce buffer.
+ */
+ memcpy(buffer, dma_addr, size);
+
+ /*
+ * Return the buffer to the free list by setting the corresponding
+ * entries to indicate the number of contigous entries available.
+ * While returning the entries to the free list, we merge the entries
+ * with slots below and above the pool being returned.
+ */
+ spin_lock_irqsave(&io_tlb_lock, flags);
+ {
+ count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ?
+ io_tlb_list[index + nslots] : 0);
+ /*
+ * Step 1: return the slots to the free list, merging the
+ * slots with superceeding slots
+ */
+ for (i = index + nslots - 1; i >= index; i--)
+ io_tlb_list[i] = ++count;
+ /*
+ * Step 2: merge the returned slots with the preceding slots,
+ * if available (non zero)
+ */
+ for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) !=
IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--)
+ io_tlb_list[i] = ++count;
+ }
+ spin_unlock_irqrestore(&io_tlb_lock, flags);
+}
+
+static void
+sync_single(struct device *hwdev, char *dma_addr, size_t size,
+ int dir, int target)
+{
+ int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
+ char *buffer = io_tlb_orig_addr[index];
+
+ switch (target) {
+ case SYNC_FOR_CPU:
+ if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
+ memcpy(buffer, dma_addr, size);
+ else
+ BUG_ON(dir != DMA_TO_DEVICE);
+ break;
+ case SYNC_FOR_DEVICE:
+ if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
+ memcpy(dma_addr, buffer, size);
+ else
+ BUG_ON(dir != DMA_FROM_DEVICE);
+ break;
+ default:
+ BUG();
+ }
+}
+
+void *
+swiotlb_alloc_coherent(struct device *hwdev, size_t size,
+ dma_addr_t *dma_handle, gfp_t flags)
+{
+ unsigned long dev_addr;
+ void *ret;
+ int order = get_order(size);
+
+ /*
+ * XXX fix me: the DMA API should pass us an explicit DMA mask
+ * instead, or use ZONE_DMA32 (ia64 overloads ZONE_DMA to be a ~32
+ * bit range instead of a 16MB one).
+ */
+ flags |= GFP_DMA;
+
+ ret = (void *)__get_free_pages(flags, order);
+ if (ret && address_needs_mapping(hwdev, virt_to_phys(ret))) {
+ /*
+ * The allocated memory isn't reachable by the device.
+ * Fall back on swiotlb_map_single().
+ */
+ free_pages((unsigned long) ret, order);
+ ret = NULL;
+ }
+ if (!ret) {
+ /*
+ * We are either out of memory or the device can't DMA
+ * to GFP_DMA memory; fall back on
+ * swiotlb_map_single(), which will grab memory from
+ * the lowest available address range.
+ */
+ dma_addr_t handle;
+ handle = swiotlb_map_single(NULL, NULL, size, DMA_FROM_DEVICE);
+ if (swiotlb_dma_mapping_error(handle))
+ return NULL;
+
+ ret = phys_to_virt(handle);
+ }
+
+ memset(ret, 0, size);
+ dev_addr = virt_to_phys(ret);
+
+ /* Confirm address can be DMA'd by device */
+ if (address_needs_mapping(hwdev, dev_addr)) {
+ printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016lx\n",
+ (unsigned long long)*hwdev->dma_mask, dev_addr);
+ panic("swiotlb_alloc_coherent: allocated memory is out of "
+ "range for device");
+ }
+ *dma_handle = dev_addr;
+ return ret;
+}
+
+void
+swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
+ dma_addr_t dma_handle)
+{
+ if (!(vaddr >= (void *)io_tlb_start
+ && vaddr < (void *)io_tlb_end))
+ free_pages((unsigned long) vaddr, get_order(size));
+ else
+ /* DMA_TO_DEVICE to avoid memcpy in unmap_single */
+ swiotlb_unmap_single (hwdev, dma_handle, size, DMA_TO_DEVICE);
+}
+
+static void
+swiotlb_full(struct device *dev, size_t size, int dir, int do_panic)
+{
+ /*
+ * Ran out of IOMMU space for this operation. This is very bad.
+ * Unfortunately the drivers cannot handle this operation properly.
+ * unless they check for dma_mapping_error (most don't)
+ * When the mapping is small enough return a static buffer to limit
+ * the damage, or panic when the transfer is too big.
+ */
+ printk(KERN_ERR "DMA: Out of SW-IOMMU space for %lu bytes at "
+ "device %s\n", size, dev ? dev->bus_id : "?");
+
+ if (size > io_tlb_overflow && do_panic) {
+ if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
+ panic("DMA: Memory would be corrupted\n");
+ if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
+ panic("DMA: Random memory would be DMAed\n");
+ }
+}
+
+/*
+ * Map a single buffer of the indicated size for DMA in streaming mode. The
+ * physical address to use is returned.
+ *
+ * Once the device is given the dma address, the device owns this memory until
+ * either swiotlb_unmap_single or swiotlb_dma_sync_single is performed.
+ */
+dma_addr_t
+swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, int dir)
+{
+ unsigned long dev_addr = virt_to_phys(ptr);
+ void *map;
+
+ BUG_ON(dir == DMA_NONE);
+ /*
+ * If the pointer passed in happens to be in the device's DMA window,
+ * we can safely return the device addr and not worry about bounce
+ * buffering it.
+ */
+ if (!address_needs_mapping(hwdev, dev_addr) && !swiotlb_force)
+ return dev_addr;
+
+ /*
+ * Oh well, have to allocate and map a bounce buffer.
+ */
+ map = map_single(hwdev, ptr, size, dir);
+ if (!map) {
+ swiotlb_full(hwdev, size, dir, 1);
+ map = io_tlb_overflow_buffer;
+ }
+
+ dev_addr = virt_to_phys(map);
+
+ /*
+ * Ensure that the address returned is DMA'ble
+ */
+ if (address_needs_mapping(hwdev, dev_addr))
+ panic("map_single: bounce buffer is not DMA'ble");
+
+ return dev_addr;
+}
+
+/*
+ * 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)
+{
+ unsigned long pg_addr, end;
+
+ pg_addr = PAGE_ALIGN((unsigned long) addr);
+ end = (unsigned long) addr + size;
+ while (pg_addr + PAGE_SIZE <= end) {
+ struct page *page = virt_to_page(pg_addr);
+ set_bit(PG_arch_1, &page->flags);
+ pg_addr += PAGE_SIZE;
+ }
+}
+
+/*
+ * Unmap a single streaming mode DMA translation. The dma_addr and size must
+ * match what was provided for in a previous swiotlb_map_single call. All
+ * other usages are undefined.
+ *
+ * After this call, reads by the cpu to the buffer are guaranteed to see
+ * whatever the device wrote there.
+ */
+void
+swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr, size_t size,
+ int dir)
+{
+ char *dma_addr = phys_to_virt(dev_addr);
+
+ BUG_ON(dir == DMA_NONE);
+ if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
+ unmap_single(hwdev, dma_addr, size, dir);
+ else if (dir == DMA_FROM_DEVICE)
+ mark_clean(dma_addr, size);
+}
+
+/*
+ * Make physical memory consistent for a single streaming mode DMA translation
+ * after a transfer.
+ *
+ * If you perform a swiotlb_map_single() but wish to interrogate the buffer
+ * using the cpu, yet do not wish to teardown the dma mapping, you must
+ * call this function before doing so. At the next point you give the dma
+ * address back to the card, you must first perform a
+ * swiotlb_dma_sync_for_device, and then the device again owns the buffer
+ */
+static inline void
+swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
+ size_t size, int dir, int target)
+{
+ char *dma_addr = phys_to_virt(dev_addr);
+
+ BUG_ON(dir == DMA_NONE);
+ if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
+ sync_single(hwdev, dma_addr, size, dir, target);
+ else if (dir == DMA_FROM_DEVICE)
+ mark_clean(dma_addr, size);
+}
+
+void
+swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
+ size_t size, int dir)
+{
+ swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
+}
+
+void
+swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
+ size_t size, int dir)
+{
+ swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
+}
+
+/*
+ * Same as above, but for a sub-range of the mapping.
+ */
+static inline void
+swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr,
+ unsigned long offset, size_t size,
+ int dir, int target)
+{
+ char *dma_addr = phys_to_virt(dev_addr) + offset;
+
+ BUG_ON(dir == DMA_NONE);
+ if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
+ sync_single(hwdev, dma_addr, size, dir, target);
+ else if (dir == DMA_FROM_DEVICE)
+ mark_clean(dma_addr, size);
+}
+
+void
+swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
+ unsigned long offset, size_t size, int dir)
+{
+ swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
+ SYNC_FOR_CPU);
+}
+
+void
+swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
+ unsigned long offset, size_t size, int dir)
+{
+ swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
+ SYNC_FOR_DEVICE);
+}
+
+/*
+ * Map a set of buffers described by scatterlist in streaming mode for DMA.
+ * This is the scatter-gather version of the above swiotlb_map_single
+ * interface. Here the scatter gather list elements are each tagged with the
+ * appropriate dma address and length. They are obtained via
+ * sg_dma_{address,length}(SG).
+ *
+ * NOTE: An implementation may be able to use a smaller number of
+ * DMA address/length pairs than there are SG table elements.
+ * (for example via virtual mapping capabilities)
+ * The routine returns the number of addr/length pairs actually
+ * used, at most nents.
+ *
+ * Device ownership issues as mentioned above for swiotlb_map_single are the
+ * same here.
+ */
+int
+swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
+ int dir)
+{
+ void *addr;
+ unsigned long dev_addr;
+ int i;
+
+ BUG_ON(dir == DMA_NONE);
+
+ for (i = 0; i < nelems; i++, sg++) {
+ addr = SG_ENT_VIRT_ADDRESS(sg);
+ dev_addr = virt_to_phys(addr);
+ if (swiotlb_force || address_needs_mapping(hwdev, dev_addr)) {
+ void *map = map_single(hwdev, addr, sg->length, dir);
+ sg->dma_address = virt_to_bus(map);
+ if (!map) {
+ /* Don't panic here, we expect map_sg users
+ to do proper error handling. */
+ swiotlb_full(hwdev, sg->length, dir, 0);
+ swiotlb_unmap_sg(hwdev, sg - i, i, dir);
+ sg[0].dma_length = 0;
+ return 0;
+ }
+ } else
+ sg->dma_address = dev_addr;
+ sg->dma_length = sg->length;
+ }
+ return nelems;
+}
+
+/*
+ * Unmap a set of streaming mode DMA translations. Again, cpu read rules
+ * concerning calls here are the same as for swiotlb_unmap_single() above.
+ */
+void
+swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
+ int dir)
+{
+ int i;
+
+ BUG_ON(dir == DMA_NONE);
+
+ for (i = 0; i < nelems; i++, sg++)
+ if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
+ unmap_single(hwdev, (void *)
phys_to_virt(sg->dma_address), sg->dma_length, dir);
+ else if (dir == DMA_FROM_DEVICE)
+ mark_clean(SG_ENT_VIRT_ADDRESS(sg), sg->dma_length);
+}
+
+/*
+ * Make physical memory consistent for a set of streaming mode DMA translations
+ * after a transfer.
+ *
+ * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules
+ * and usage.
+ */
+static inline void
+swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sg,
+ int nelems, int dir, int target)
+{
+ int i;
+
+ BUG_ON(dir == DMA_NONE);
+
+ for (i = 0; i < nelems; i++, sg++)
+ if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
+ sync_single(hwdev, (void *) sg->dma_address,
+ sg->dma_length, dir, target);
+}
+
+void
+swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
+ int nelems, int dir)
+{
+ swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
+}
+
+void
+swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
+ int nelems, int dir)
+{
+ swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
+}
+
+int
+swiotlb_dma_mapping_error(dma_addr_t dma_addr)
+{
+ return (dma_addr == virt_to_phys(io_tlb_overflow_buffer));
+}
+
+/*
+ * Return whether the given device DMA address mask can be supported
+ * properly. For example, if your device can only drive the low 24-bits
+ * during bus mastering, then you would pass 0x00ffffff as the mask to
+ * this function.
+ */
+int
+swiotlb_dma_supported (struct device *hwdev, u64 mask)
+{
+ return (virt_to_phys (io_tlb_end) - 1) <= mask;
+}
+
+EXPORT_SYMBOL(swiotlb_init);
+EXPORT_SYMBOL(swiotlb_map_single);
+EXPORT_SYMBOL(swiotlb_unmap_single);
+EXPORT_SYMBOL(swiotlb_map_sg);
+EXPORT_SYMBOL(swiotlb_unmap_sg);
+EXPORT_SYMBOL(swiotlb_sync_single_for_cpu);
+EXPORT_SYMBOL(swiotlb_sync_single_for_device);
+EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu);
+EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
+EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu);
+EXPORT_SYMBOL(swiotlb_sync_sg_for_device);
+EXPORT_SYMBOL(swiotlb_dma_mapping_error);
+EXPORT_SYMBOL(swiotlb_alloc_coherent);
+EXPORT_SYMBOL(swiotlb_free_coherent);
+EXPORT_SYMBOL(swiotlb_dma_supported);
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