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kernel_optimize_test/arch/ia64/hp/common/sba_iommu.c
Rafael J. Wysocki 12e27b1154 ACPI / ia64 / sba_iommu: Restore the working initialization ordering 
Commit 66345d5f79 (ACPI / ia64 / sba_iommu: Use ACPI scan handler
for device discovery) changed the ordering of SBA (System Bus Adapter)
IOMMU initialization with respect to the PCI host bridge initialization
which broke things inadvertently, because the SBA IOMMU initialization
code has to run after the PCI host bridge has been initialized.

Fix that by reworking the SBA IOMMU ACPI scan handler so that it
claims the discovered matching ACPI device objects without attempting
to initialize anything and move the entire SBA IOMMU initialization
to sba_init() that runs after the PCI bus has been enumerated.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=76691
Fixes: 66345d5f79 (ACPI / ia64 / sba_iommu: Use ACPI scan handler for device discovery)
Reported-and-tested-by: Émeric Maschino <emeric.maschino@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: 3.11+ <stable@vger.kernel.org> # 3.11+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-06-16 22:33:20 +02:00

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/*
** 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 <linux/crash_dump.h>
#include <linux/iommu-helper.h>
#include <linux/dma-mapping.h>
#include <linux/prefetch.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>
extern int swiotlb_late_init_with_default_size (size_t size);
#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
#ifdef CONFIG_PCI
# define GET_IOC(dev) ((dev_is_pci(dev)) \
? ((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) 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 = (unsigned long long)dma_get_seg_boundary(dev) + 1;
boundary_size = ALIGN(boundary_size, 1ULL << iovp_shift) >> 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)
{
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_attrs - 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.
* @attrs: optional dma attributes
*
* See Documentation/DMA-API-HOWTO.txt
*/
static dma_addr_t sba_map_page(struct device *dev, struct page *page,
unsigned long poff, size_t size,
enum dma_data_direction dir,
struct dma_attrs *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_single_attrs() 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_attrs()"))
panic("Sanity check failed");
spin_unlock_irqrestore(&ioc->res_lock, flags);
#endif
pide = sba_alloc_range(ioc, dev, size);
if (pide < 0)
return 0;
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_single_attrs()");
spin_unlock_irqrestore(&ioc->res_lock, flags);
#endif
return SBA_IOVA(ioc, iovp, offset);
}
static dma_addr_t sba_map_single_attrs(struct device *dev, void *addr,
size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
return sba_map_page(dev, virt_to_page(addr),
(unsigned long)addr & ~PAGE_MASK, size, dir, attrs);
}
#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_attrs - 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/DMA-API-HOWTO.txt
*/
static void sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size,
enum dma_data_direction dir, struct dma_attrs *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_single_attrs() 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 */
}
void sba_unmap_single_attrs(struct device *dev, dma_addr_t iova, size_t size,
enum dma_data_direction dir, struct dma_attrs *attrs)
{
sba_unmap_page(dev, iova, size, dir, attrs);
}
/**
* 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-API-HOWTO.txt
*/
static void *
sba_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t flags, struct dma_attrs *attrs)
{
struct ioc *ioc;
void *addr;
ioc = GET_IOC(dev);
ASSERT(ioc);
#ifdef CONFIG_NUMA
{
int node = ioc->node;
struct page *page;
if (node == NUMA_NO_NODE)
node = numa_node_id();
page = alloc_pages_exact_node(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_attrs(&ioc->sac_only_dev->dev, addr,
size, 0, 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/DMA-API-HOWTO.txt
*/
static void sba_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, struct dma_attrs *attrs)
{
sba_unmap_single_attrs(dev, dma_handle, size, 0, NULL);
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,
struct dma_attrs *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/DMA-API-HOWTO.txt
*/
static int sba_map_sg_attrs(struct device *dev, struct scatterlist *sglist,
int nents, enum dma_data_direction dir,
struct dma_attrs *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_single_attrs(dev, sba_sg_address(sglist), sglist->length, dir, attrs);
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 0;
}
/*
** 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/DMA-API-HOWTO.txt
*/
static void sba_unmap_sg_attrs(struct device *dev, struct scatterlist *sglist,
int nents, enum dma_data_direction dir,
struct dma_attrs *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_single_attrs(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;
#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 void 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);
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);
}
/**************************************************************************
**
** 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 int
ioc_open(struct inode *inode, struct file *file)
{
return seq_open(file, &ioc_seq_ops);
}
static const 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;
dir = proc_mkdir("bus/mckinley", NULL);
if (!dir)
return;
proc_create(ioc_list->name, 0, dir, &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 = 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 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);
extern struct dma_map_ops swiotlb_dma_ops;
static int __init
sba_init(void)
{
if (!ia64_platform_is("hpzx1") && !ia64_platform_is("hpzx1_swiotlb"))
return 0;
#if defined(CONFIG_IA64_GENERIC)
/* 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 the swiotlb.
*/
if (is_kdump_kernel()) {
dma_ops = &swiotlb_dma_ops;
if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
panic("Unable to initialize software I/O TLB:"
" Try machvec=dig boot option");
machvec_init("dig");
return 0;
}
#endif
/*
* 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) {
#ifdef CONFIG_IA64_GENERIC
/*
* If we didn't find something sba_iommu can claim, we
* need to setup the swiotlb and switch to the dig machvec.
*/
dma_ops = &swiotlb_dma_ops;
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;
}
static int sba_dma_supported (struct device *dev, u64 mask)
{
/* make sure it's at least 32bit capable */
return ((mask & 0xFFFFFFFFUL) == 0xFFFFFFFFUL);
}
static int sba_dma_mapping_error(struct device *dev, 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",
__func__, page_size);
}
return 1;
}
__setup("sbapagesize=",sba_page_override);
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,
.sync_single_for_cpu = machvec_dma_sync_single,
.sync_sg_for_cpu = machvec_dma_sync_sg,
.sync_single_for_device = machvec_dma_sync_single,
.sync_sg_for_device = machvec_dma_sync_sg,
.dma_supported = sba_dma_supported,
.mapping_error = sba_dma_mapping_error,
};
void sba_dma_init(void)
{
dma_ops = &sba_dma_ops;
}
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