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sba_iommu.c
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sba_iommu.c
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/*
** System Bus Adapter (SBA) I/O MMU manager
**
** (c) Copyright 2000-2004 Grant Grundler <grundler @ parisc-linux x org>
** (c) Copyright 2004 Naresh Kumar Inna <knaresh at india x hp x com>
** (c) Copyright 2000-2004 Hewlett-Packard Company
**
** 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 B1000/C3000/
** J5000/J7000/N-class/L-class machines and their successors.
**
** FIXME: add DMA hint support programming in both sba and lba modules.
*/
#include <linux/types.h>
#include <linux/kernel.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/scatterlist.h>
#include <linux/iommu-helper.h>
#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/dma.h> /* for DMA_CHUNK_SIZE */
#include <asm/hardware.h> /* for register_parisc_driver() stuff */
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/module.h>
#include <asm/ropes.h>
#include <asm/mckinley.h> /* for proc_mckinley_root */
#include <asm/runway.h> /* for proc_runway_root */
#include <asm/page.h> /* for PAGE0 */
#include <asm/pdc.h> /* for PDC_MODEL_* */
#include <asm/pdcpat.h> /* for is_pdc_pat() */
#include <asm/parisc-device.h>
#define MODULE_NAME "SBA"
/*
** The number of debug flags is a clue - this code is fragile.
** Don't even think about messing with it unless you have
** plenty of 710's to sacrifice to the computer gods. :^)
*/
#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_DMB_TRAP
#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
#define SBA_INLINE __inline__
#define DEFAULT_DMA_HINT_REG 0
#define SBA_MAPPING_ERROR (~(dma_addr_t)0)
struct sba_device *sba_list;
EXPORT_SYMBOL_GPL(sba_list);
static unsigned long ioc_needs_fdc = 0;
/* global count of IOMMUs in the system */
static unsigned int global_ioc_cnt = 0;
/* PA8700 (Piranha 2.2) bug workaround */
static unsigned long piranha_bad_128k = 0;
/* Looks nice and keeps the compiler happy */
#define SBA_DEV(d) ((struct sba_device *) (d))
#ifdef CONFIG_AGP_PARISC
#define SBA_AGP_SUPPORT
#endif /*CONFIG_AGP_PARISC*/
#ifdef SBA_AGP_SUPPORT
static int sba_reserve_agpgart = 1;
module_param(sba_reserve_agpgart, int, 0444);
MODULE_PARM_DESC(sba_reserve_agpgart, "Reserve half of IO pdir as AGPGART");
#endif
/************************************
** SBA register read and write support
**
** BE WARNED: register writes are posted.
** (ie follow writes which must reach HW with a read)
**
** Superdome (in particular, REO) allows only 64-bit CSR accesses.
*/
#define READ_REG32(addr) readl(addr)
#define READ_REG64(addr) readq(addr)
#define WRITE_REG32(val, addr) writel((val), (addr))
#define WRITE_REG64(val, addr) writeq((val), (addr))
#ifdef CONFIG_64BIT
#define READ_REG(addr) READ_REG64(addr)
#define WRITE_REG(value, addr) WRITE_REG64(value, addr)
#else
#define READ_REG(addr) READ_REG32(addr)
#define WRITE_REG(value, addr) WRITE_REG32(value, addr)
#endif
#ifdef DEBUG_SBA_INIT
/* NOTE: When CONFIG_64BIT isn't defined, READ_REG64() is two 32-bit reads */
/**
* sba_dump_ranges - debugging only - print ranges assigned to this IOA
* @hpa: base address of the sba
*
* Print the MMIO and IO Port address ranges forwarded by an Astro/Ike/RIO
* IO Adapter (aka Bus Converter).
*/
static void
sba_dump_ranges(void __iomem *hpa)
{
DBG_INIT("SBA at 0x%p\n", hpa);
DBG_INIT("IOS_DIST_BASE : %Lx\n", READ_REG64(hpa+IOS_DIST_BASE));
DBG_INIT("IOS_DIST_MASK : %Lx\n", READ_REG64(hpa+IOS_DIST_MASK));
DBG_INIT("IOS_DIST_ROUTE : %Lx\n", READ_REG64(hpa+IOS_DIST_ROUTE));
DBG_INIT("\n");
DBG_INIT("IOS_DIRECT_BASE : %Lx\n", READ_REG64(hpa+IOS_DIRECT_BASE));
DBG_INIT("IOS_DIRECT_MASK : %Lx\n", READ_REG64(hpa+IOS_DIRECT_MASK));
DBG_INIT("IOS_DIRECT_ROUTE: %Lx\n", READ_REG64(hpa+IOS_DIRECT_ROUTE));
}
/**
* 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(void __iomem *hpa)
{
DBG_INIT("IO TLB at 0x%p\n", hpa);
DBG_INIT("IOC_IBASE : 0x%Lx\n", READ_REG64(hpa+IOC_IBASE));
DBG_INIT("IOC_IMASK : 0x%Lx\n", READ_REG64(hpa+IOC_IMASK));
DBG_INIT("IOC_TCNFG : 0x%Lx\n", READ_REG64(hpa+IOC_TCNFG));
DBG_INIT("IOC_PDIR_BASE: 0x%Lx\n", READ_REG64(hpa+IOC_PDIR_BASE));
DBG_INIT("\n");
}
#else
#define sba_dump_ranges(x)
#define sba_dump_tlb(x)
#endif /* DEBUG_SBA_INIT */
#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 & (~0U * BITS_PER_LONG)]);
unsigned long *rptr = (unsigned long *) &(ioc->res_map[(pide >>3) & ~(sizeof(unsigned long) - 1)]);
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, *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)
{
u32 *rptr_end = (u32 *) &(ioc->res_map[ioc->res_size]);
u32 *rptr = (u32 *) ioc->res_map; /* resource map ptr */
u64 *pptr = ioc->pdir_base; /* pdir ptr */
uint pide = 0;
while (rptr < rptr_end) {
u32 rval = *rptr;
int rcnt = 32; /* number of bits we might check */
while (rcnt) {
/* Get last byte and highest bit from that */
u32 pde = ((u32) (((char *)pptr)[7])) << 24;
if ((rval ^ pde) & 0x80000000)
{
/*
** 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 : %08lx/%05x %p/%05x\n",
nents,
(unsigned long) sg_dma_address(startsg),
sg_dma_len(startsg),
sg_virt(startsg), startsg->length);
startsg++;
}
}
#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. */
#ifdef ZX1_SUPPORT
/* Pluto (aka ZX1) boxes need to set or clear the ibase bits appropriately */
#define SBA_IOVA(ioc,iovp,offset,hint_reg) ((ioc->ibase) | (iovp) | (offset))
#define SBA_IOVP(ioc,iova) ((iova) & (ioc)->iovp_mask)
#else
/* only support Astro and ancestors. Saves a few cycles in key places */
#define SBA_IOVA(ioc,iovp,offset,hint_reg) ((iovp) | (offset))
#define SBA_IOVP(ioc,iova) (iova)
#endif
#define PDIR_INDEX(iovp) ((iovp)>>IOVP_SHIFT)
#define RESMAP_MASK(n) (~0UL << (BITS_PER_LONG - (n)))
#define RESMAP_IDX_MASK (sizeof(unsigned long) - 1)
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.
*
* 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)
{
unsigned long *res_ptr = ioc->res_hint;
unsigned long *res_end = (unsigned long *) &(ioc->res_map[ioc->res_size]);
unsigned long pide = ~0UL, tpide;
unsigned long boundary_size;
unsigned long shift;
int ret;
boundary_size = ALIGN((unsigned long long)dma_get_seg_boundary(dev) + 1,
1ULL << IOVP_SHIFT) >> IOVP_SHIFT;
#if defined(ZX1_SUPPORT)
BUG_ON(ioc->ibase & ~IOVP_MASK);
shift = ioc->ibase >> IOVP_SHIFT;
#else
shift = 0;
#endif
if (bits_wanted > (BITS_PER_LONG/2)) {
/* Search word at a time - no mask needed */
for(; res_ptr < res_end; ++res_ptr) {
tpide = ptr_to_pide(ioc, res_ptr, 0);
ret = iommu_is_span_boundary(tpide, bits_wanted,
shift,
boundary_size);
if ((*res_ptr == 0) && !ret) {
*res_ptr = RESMAP_MASK(bits_wanted);
pide = tpide;
break;
}
}
/* point to the next word on next pass */
res_ptr++;
ioc->res_bitshift = 0;
} else {
/*
** 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_order(bits_wanted << PAGE_SHIFT);
uint bitshiftcnt = ALIGN(ioc->res_bitshift, o);
unsigned long mask;
if (bitshiftcnt >= BITS_PER_LONG) {
bitshiftcnt = 0;
res_ptr++;
}
mask = RESMAP_MASK(bits_wanted) >> bitshiftcnt;
DBG_RES("%s() o %ld %p", __func__, o, res_ptr);
while(res_ptr < res_end)
{
DBG_RES(" %p %lx %lx\n", res_ptr, mask, *res_ptr);
WARN_ON(mask == 0);
tpide = ptr_to_pide(ioc, res_ptr, bitshiftcnt);
ret = iommu_is_span_boundary(tpide, bits_wanted,
shift,
boundary_size);
if ((((*res_ptr) & mask) == 0) && !ret) {
*res_ptr |= mask; /* mark resources busy! */
pide = tpide;
break;
}
mask >>= o;
bitshiftcnt += o;
if (mask == 0) {
mask = RESMAP_MASK(bits_wanted);
bitshiftcnt=0;
res_ptr++;
}
}
/* look in the same word on the next pass */
ioc->res_bitshift = bitshiftcnt + bits_wanted;
}
/* wrapped ? */
if (res_end <= res_ptr) {
ioc->res_hint = (unsigned long *) ioc->res_map;
ioc->res_bitshift = 0;
} else {
ioc->res_hint = res_ptr;
}
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 SBA_COLLECT_STATS
unsigned long cr_start = mfctl(16);
#endif
unsigned long pide;
pide = sba_search_bitmap(ioc, dev, pages_needed);
if (pide >= (ioc->res_size << 3)) {
pide = sba_search_bitmap(ioc, dev, pages_needed);
if (pide >= (ioc->res_size << 3))
panic("%s: I/O MMU @ %p is out of mapping resources\n",
__FILE__, ioc->ioc_hpa);
}
#ifdef ASSERT_PDIR_SANITY
/* verify the first enable bit is clear */
if(0x00 != ((u8 *) ioc->pdir_base)[pide*sizeof(u64) + 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 );
#ifdef SBA_COLLECT_STATS
{
unsigned long cr_end = mfctl(16);
unsigned long tmp = cr_end - cr_start;
/* check for roll over */
cr_start = (cr_end < cr_start) ? -(tmp) : (tmp);
}
ioc->avg_search[ioc->avg_idx++] = cr_start;
ioc->avg_idx &= SBA_SEARCH_SAMPLE - 1;
ioc->used_pages += pages_needed;
#endif
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;
/* 3-bits "bit" address plus 2 (or 3) bits for "byte" == bit in word */
unsigned long m = RESMAP_MASK(bits_not_wanted) >> (pide & (BITS_PER_LONG - 1));
DBG_RES("%s( ,%x,%x) %x/%lx %x %p %lx\n",
__func__, (uint) iova, size,
bits_not_wanted, m, pide, res_ptr, *res_ptr);
#ifdef SBA_COLLECT_STATS
ioc->used_pages -= bits_not_wanted;
#endif
*res_ptr &= ~m;
}
/**************************************************************
*
* "Dynamic DMA Mapping" support (aka "Coherent I/O")
*
***************************************************************/
#ifdef SBA_HINT_SUPPORT
#define SBA_DMA_HINT(ioc, val) ((val) << (ioc)->hint_shift_pdir)
#endif
typedef unsigned long space_t;
#define KERNEL_SPACE 0
/**
* sba_io_pdir_entry - fill in one IO PDIR entry
* @pdir_ptr: pointer to IO PDIR entry
* @sid: process Space ID - currently only support KERNEL_SPACE
* @vba: Virtual CPU address of buffer to map
* @hint: DMA hint set to use for this mapping
*
* SBA Mapping Routine
*
* Given a virtual address (vba, arg2) and space id, (sid, arg1)
* sba_io_pdir_entry() loads the I/O PDIR entry pointed to by
* pdir_ptr (arg0).
* Using the bass-ackwards HP bit numbering, Each IO Pdir entry
* for Astro/Ike looks like:
*
*
* 0 19 51 55 63
* +-+---------------------+----------------------------------+----+--------+
* |V| U | PPN[43:12] | U | VI |
* +-+---------------------+----------------------------------+----+--------+
*
* Pluto is basically identical, supports fewer physical address bits:
*
* 0 23 51 55 63
* +-+------------------------+-------------------------------+----+--------+
* |V| U | PPN[39:12] | U | VI |
* +-+------------------------+-------------------------------+----+--------+
*
* V == Valid Bit (Most Significant Bit is bit 0)
* U == Unused
* PPN == Physical Page Number
* VI == Virtual Index (aka Coherent Index)
*
* LPA instruction output is put into PPN field.
* LCI (Load Coherence Index) instruction provides the "VI" bits.
*
* We pre-swap the bytes since PCX-W is Big Endian and the
* IOMMU uses little endian for the pdir.
*/
static void SBA_INLINE
sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
unsigned long hint)
{
u64 pa; /* physical address */
register unsigned ci; /* coherent index */
pa = virt_to_phys(vba);
pa &= IOVP_MASK;
mtsp(sid,1);
asm("lci 0(%%sr1, %1), %0" : "=r" (ci) : "r" (vba));
pa |= (ci >> PAGE_SHIFT) & 0xff; /* move CI (8 bits) into lowest byte */
pa |= SBA_PDIR_VALID_BIT; /* set "valid" bit */
*pdir_ptr = cpu_to_le64(pa); /* swap and store into I/O Pdir */
/*
* If the PDC_MODEL capabilities has Non-coherent IO-PDIR bit set
* (bit #61, big endian), we have to flush and sync every time
* IO-PDIR is changed in Ike/Astro.
*/
if (ioc_needs_fdc)
asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
}
/**
* 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 Ike 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);
u64 *pdir_ptr = &ioc->pdir_base[PDIR_INDEX(iovp)];
#ifdef ASSERT_PDIR_SANITY
/* Assert first pdir entry is set.
**
** Even though this is a big-endian machine, the entries
** in the iopdir are little endian. That's why we look at
** the byte at +7 instead of at +0.
*/
if (0x80 != (((u8 *) pdir_ptr)[7])) {
sba_dump_pdir_entry(ioc,"sba_mark_invalid()", PDIR_INDEX(iovp));
}
#endif
if (byte_cnt > IOVP_SIZE)
{
#if 0
unsigned long entries_per_cacheline = ioc_needs_fdc ?
L1_CACHE_ALIGN(((unsigned long) pdir_ptr))
- (unsigned long) pdir_ptr;
: 262144;
#endif
/* set "size" field for PCOM */
iovp |= get_order(byte_cnt) + PAGE_SHIFT;
do {
/* clear I/O Pdir entry "valid" bit first */
((u8 *) pdir_ptr)[7] = 0;
if (ioc_needs_fdc) {
asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
#if 0
entries_per_cacheline = L1_CACHE_SHIFT - 3;
#endif
}
pdir_ptr++;
byte_cnt -= IOVP_SIZE;
} while (byte_cnt > IOVP_SIZE);
} else
iovp |= IOVP_SHIFT; /* set "size" field for PCOM */
/*
** clear I/O PDIR entry "valid" bit.
** We have to R/M/W the cacheline regardless how much of the
** pdir entry that we clobber.
** The rest of the entry would be useful for debugging if we
** could dump core on HPMC.
*/
((u8 *) pdir_ptr)[7] = 0;
if (ioc_needs_fdc)
asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
WRITE_REG( SBA_IOVA(ioc, iovp, 0, 0), ioc->ioc_hpa+IOC_PCOM);
}
/**
* sba_dma_supported - PCI driver can query DMA support
* @dev: instance of PCI owned by the driver that's asking
* @mask: number of address bits this PCI device can handle
*
* See Documentation/DMA-API-HOWTO.txt
*/
static int sba_dma_supported( struct device *dev, u64 mask)
{
struct ioc *ioc;
if (dev == NULL) {
printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n");
BUG();
return(0);
}
/* Documentation/DMA-API-HOWTO.txt tells drivers to try 64-bit
* first, then fall back to 32-bit if that fails.
* We are just "encouraging" 32-bit DMA masks here since we can
* never allow IOMMU bypass unless we add special support for ZX1.
*/
if (mask > ~0U)
return 0;
ioc = GET_IOC(dev);
if (!ioc)
return 0;
/*
* check if mask is >= than the current max IO Virt Address
* The max IO Virt address will *always* < 30 bits.
*/
return((int)(mask >= (ioc->ibase - 1 +
(ioc->pdir_size / sizeof(u64) * IOVP_SIZE) )));
}
/**
* 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.
* @direction: R/W or both.
*
* See Documentation/DMA-API-HOWTO.txt
*/
static dma_addr_t
sba_map_single(struct device *dev, void *addr, size_t size,
enum dma_data_direction direction)
{
struct ioc *ioc;
unsigned long flags;
dma_addr_t iovp;
dma_addr_t offset;
u64 *pdir_start;
int pide;
ioc = GET_IOC(dev);
if (!ioc)
return SBA_MAPPING_ERROR;
/* save offset bits */
offset = ((dma_addr_t) (long) addr) & ~IOVP_MASK;
/* round up to nearest IOVP_SIZE */
size = (size + offset + ~IOVP_MASK) & IOVP_MASK;
spin_lock_irqsave(&ioc->res_lock, flags);
#ifdef ASSERT_PDIR_SANITY
sba_check_pdir(ioc,"Check before sba_map_single()");
#endif
#ifdef SBA_COLLECT_STATS
ioc->msingle_calls++;
ioc->msingle_pages += size >> IOVP_SHIFT;
#endif
pide = sba_alloc_range(ioc, dev, size);
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) {
sba_io_pdir_entry(pdir_start, KERNEL_SPACE, (unsigned long) addr, 0);
DBG_RUN(" pdir 0x%p %02x%02x%02x%02x%02x%02x%02x%02x\n",
pdir_start,
(u8) (((u8 *) pdir_start)[7]),
(u8) (((u8 *) pdir_start)[6]),
(u8) (((u8 *) pdir_start)[5]),
(u8) (((u8 *) pdir_start)[4]),
(u8) (((u8 *) pdir_start)[3]),
(u8) (((u8 *) pdir_start)[2]),
(u8) (((u8 *) pdir_start)[1]),
(u8) (((u8 *) pdir_start)[0])
);
addr += IOVP_SIZE;
size -= IOVP_SIZE;
pdir_start++;
}
/* force FDC ops in io_pdir_entry() to be visible to IOMMU */
if (ioc_needs_fdc)
asm volatile("sync" : : );
#ifdef ASSERT_PDIR_SANITY
sba_check_pdir(ioc,"Check after sba_map_single()");
#endif
spin_unlock_irqrestore(&ioc->res_lock, flags);
/* form complete address */
return SBA_IOVA(ioc, iovp, offset, DEFAULT_DMA_HINT_REG);
}
static dma_addr_t
sba_map_page(struct device *dev, struct page *page, unsigned long offset,
size_t size, enum dma_data_direction direction,
unsigned long attrs)
{
return sba_map_single(dev, page_address(page) + offset, size,
direction);
}
/**
* sba_unmap_page - unmap one IOVA and free resources
* @dev: instance of PCI owned by the driver that's asking.
* @iova: IOVA of driver buffer previously mapped.
* @size: number of bytes mapped in driver buffer.
* @direction: R/W or both.
*
* 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 direction, unsigned long attrs)
{
struct ioc *ioc;
#if DELAYED_RESOURCE_CNT > 0
struct sba_dma_pair *d;
#endif
unsigned long flags;
dma_addr_t offset;
DBG_RUN("%s() iovp 0x%lx/%x\n", __func__, (long) iova, size);
ioc = GET_IOC(dev);
if (!ioc) {
WARN_ON(!ioc);
return;
}
offset = iova & ~IOVP_MASK;
iova ^= offset; /* clear offset bits */
size += offset;
size = ALIGN(size, IOVP_SIZE);
spin_lock_irqsave(&ioc->res_lock, flags);
#ifdef SBA_COLLECT_STATS
ioc->usingle_calls++;
ioc->usingle_pages += size >> IOVP_SHIFT;
#endif
sba_mark_invalid(ioc, iova, size);
#if DELAYED_RESOURCE_CNT > 0
/* Delaying when we re-use a IO Pdir entry reduces the number
* of MMIO reads needed to flush writes to the PCOM register.
*/
d = &(ioc->saved[ioc->saved_cnt]);
d->iova = iova;
d->size = size;
if (++(ioc->saved_cnt) >= DELAYED_RESOURCE_CNT) {
int cnt = ioc->saved_cnt;
while (cnt--) {
sba_free_range(ioc, d->iova, d->size);
d--;
}
ioc->saved_cnt = 0;
READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
}
#else /* DELAYED_RESOURCE_CNT == 0 */
sba_free_range(ioc, iova, size);
/* If fdc's were issued, force fdc's to be visible now */
if (ioc_needs_fdc)
asm volatile("sync" : : );
READ_REG(ioc->ioc_hpa+IOC_PCOM); /* flush purges */
#endif /* DELAYED_RESOURCE_CNT == 0 */
spin_unlock_irqrestore(&ioc->res_lock, flags);
/* XXX REVISIT for 2.5 Linux - need syncdma for zero-copy support.
** For Astro based systems this isn't a big deal WRT performance.
** As long as 2.4 kernels copyin/copyout data from/to userspace,
** we don't need the syncdma. The issue here is I/O MMU cachelines
** are *not* coherent in all cases. May be hwrev dependent.
** Need to investigate more.
asm volatile("syncdma");
*/
}
/**
* sba_alloc - allocate/map shared mem for DMA
* @hwdev: 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(struct device *hwdev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs)
{
void *ret;
if (!hwdev) {
/* only support PCI */
*dma_handle = 0;
return NULL;
}
ret = (void *) __get_free_pages(gfp, get_order(size));
if (ret) {
memset(ret, 0, size);
*dma_handle = sba_map_single(hwdev, ret, size, 0);
}
return ret;
}
/**
* sba_free - free/unmap shared mem for DMA
* @hwdev: 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(struct device *hwdev, size_t size, void *vaddr,
dma_addr_t dma_handle, unsigned long attrs)
{
sba_unmap_page(hwdev, dma_handle, size, 0, 0);
free_pages((unsigned long) vaddr, get_order(size));
}
/*
** Since 0 is a valid pdir_base index value, can't use that
** to determine if a value is valid or not. Use a flag to indicate
** the SG list entry contains a valid pdir index.
*/
#define PIDE_FLAG 0x80000000UL
#ifdef SBA_COLLECT_STATS
#define IOMMU_MAP_STATS
#endif
#include "iommu-helpers.h"
#ifdef DEBUG_LARGE_SG_ENTRIES
int dump_run_sg = 0;
#endif
/**
* 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
* @direction: R/W or both.
*
* See Documentation/DMA-API-HOWTO.txt
*/
static int
sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
enum dma_data_direction direction, unsigned long attrs)
{
struct ioc *ioc;
int coalesced, filled = 0;
unsigned long flags;
DBG_RUN_SG("%s() START %d entries\n", __func__, nents);
ioc = GET_IOC(dev);
if (!ioc)
return 0;
/* Fast path single entry scatterlists. */
if (nents == 1) {
sg_dma_address(sglist) = sba_map_single(dev, sg_virt(sglist),
sglist->length, direction);
sg_dma_len(sglist) = sglist->length;
return 1;
}
spin_lock_irqsave(&ioc->res_lock, flags);
#ifdef ASSERT_PDIR_SANITY
if (sba_check_pdir(ioc,"Check before sba_map_sg()"))
{
sba_dump_sg(ioc, sglist, nents);
panic("Check before sba_map_sg()");
}
#endif
#ifdef SBA_COLLECT_STATS
ioc->msg_calls++;
#endif
/*
** 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 = iommu_coalesce_chunks(ioc, dev, sglist, nents, sba_alloc_range);
/*