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NetBSD/sys/arch/sparc64/dev/iommu.c

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/* $NetBSD: iommu.c,v 1.81 2007/03/04 06:00:49 christos Exp $ */
/*
* Copyright (c) 2001, 2002 Eduardo Horvath
* Copyright (c) 1999, 2000 Matthew R. Green
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* UltraSPARC IOMMU support; used by both the sbus and pci code.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: iommu.c,v 1.81 2007/03/04 06:00:49 christos Exp $");
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/extent.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <uvm/uvm_extern.h>
#include <machine/bus.h>
#include <sparc64/sparc64/cache.h>
#include <sparc64/dev/iommureg.h>
#include <sparc64/dev/iommuvar.h>
#include <machine/autoconf.h>
#include <machine/cpu.h>
#ifdef DEBUG
#define IDB_BUSDMA 0x1
#define IDB_IOMMU 0x2
#define IDB_INFO 0x4
#define IDB_SYNC 0x8
int iommudebug = 0x0;
#define DPRINTF(l, s) do { if (iommudebug & l) printf s; } while (0)
#else
#define DPRINTF(l, s)
#endif
#define iommu_strbuf_flush(i, v) do { \
if ((i)->sb_flush) \
bus_space_write_8((i)->sb_is->is_bustag, (i)->sb_sb, \
STRBUFREG(strbuf_pgflush), (v)); \
} while (0)
static int iommu_strbuf_flush_done(struct strbuf_ctl *);
/*
* initialise the UltraSPARC IOMMU (SBUS or PCI):
* - allocate and setup the iotsb.
* - enable the IOMMU
* - initialise the streaming buffers (if they exist)
* - create a private DVMA map.
*/
void
iommu_init(char *name, struct iommu_state *is, int tsbsize, uint32_t iovabase)
{
psize_t size;
vaddr_t va;
paddr_t pa;
struct vm_page *pg;
struct pglist pglist;
/*
* Setup the iommu.
*
* The sun4u iommu is part of the SBUS or PCI controller so we will
* deal with it here..
*
* For sysio and psycho/psycho+ the IOMMU address space always ends at
* 0xffffe000, but the starting address depends on the size of the
* map. The map size is 1024 * 2 ^ is->is_tsbsize entries, where each
* entry is 8 bytes. The start of the map can be calculated by
* (0xffffe000 << (8 + is->is_tsbsize)).
*
* But sabre and hummingbird use a different scheme that seems to
* be hard-wired, so we read the start and size from the PROM and
* just use those values.
*/
is->is_cr = (tsbsize << 16) | IOMMUCR_EN;
is->is_tsbsize = tsbsize;
if (iovabase == -1) {
is->is_dvmabase = IOTSB_VSTART(is->is_tsbsize);
is->is_dvmaend = IOTSB_VEND;
} else {
is->is_dvmabase = iovabase;
is->is_dvmaend = iovabase + IOTSB_VSIZE(tsbsize);
}
/*
* Allocate memory for I/O pagetables. They need to be physically
* contiguous.
*/
size = PAGE_SIZE << is->is_tsbsize;
if (uvm_pglistalloc((psize_t)size, (paddr_t)0, (paddr_t)-1,
(paddr_t)PAGE_SIZE, (paddr_t)0, &pglist, 1, 0) != 0)
panic("iommu_init: no memory");
va = uvm_km_alloc(kernel_map, size, 0, UVM_KMF_VAONLY);
if (va == 0)
panic("iommu_init: no memory");
is->is_tsb = (int64_t *)va;
is->is_ptsb = VM_PAGE_TO_PHYS(TAILQ_FIRST(&pglist));
/* Map the pages */
TAILQ_FOREACH(pg, &pglist, pageq) {
pa = VM_PAGE_TO_PHYS(pg);
pmap_kenter_pa(va, pa | PMAP_NVC, VM_PROT_READ | VM_PROT_WRITE);
va += PAGE_SIZE;
}
pmap_update(pmap_kernel());
memset(is->is_tsb, 0, size);
#ifdef DEBUG
if (iommudebug & IDB_INFO)
{
/* Probe the iommu */
printf("iommu regs at: cr=%lx tsb=%lx flush=%lx\n",
(u_long)bus_space_read_8(is->is_bustag, is->is_iommu,
offsetof (struct iommureg, iommu_cr)),
(u_long)bus_space_read_8(is->is_bustag, is->is_iommu,
offsetof (struct iommureg, iommu_tsb)),
(u_long)bus_space_read_8(is->is_bustag, is->is_iommu,
offsetof (struct iommureg, iommu_flush)));
printf("iommu cr=%llx tsb=%llx\n",
(unsigned long long)bus_space_read_8(is->is_bustag,
is->is_iommu,
offsetof (struct iommureg, iommu_cr)),
(unsigned long long)bus_space_read_8(is->is_bustag,
is->is_iommu,
offsetof (struct iommureg, iommu_tsb)));
printf("TSB base %p phys %llx\n", (void *)is->is_tsb,
(unsigned long long)is->is_ptsb);
delay(1000000); /* 1 s */
}
#endif
/*
* now actually start up the IOMMU
*/
iommu_reset(is);
/*
* Now all the hardware's working we need to allocate a dvma map.
*/
printf("DVMA map: %x to %x\n",
(unsigned int)is->is_dvmabase,
(unsigned int)is->is_dvmaend);
printf("IOTSB: %llx to %llx\n",
(unsigned long long)is->is_ptsb,
(unsigned long long)(is->is_ptsb + size));
is->is_dvmamap = extent_create(name,
is->is_dvmabase, is->is_dvmaend - PAGE_SIZE,
M_DEVBUF, 0, 0, EX_NOWAIT);
}
/*
* Streaming buffers don't exist on the UltraSPARC IIi; we should have
* detected that already and disabled them. If not, we will notice that
* they aren't there when the STRBUF_EN bit does not remain.
*/
void
iommu_reset(struct iommu_state *is)
{
int i;
struct strbuf_ctl *sb;
/* Need to do 64-bit stores */
bus_space_write_8(is->is_bustag, is->is_iommu, IOMMUREG(iommu_tsb),
is->is_ptsb);
/* Enable IOMMU in diagnostic mode */
bus_space_write_8(is->is_bustag, is->is_iommu, IOMMUREG(iommu_cr),
is->is_cr|IOMMUCR_DE);
for (i = 0; i < 2; i++) {
if ((sb = is->is_sb[i])) {
/* Enable diagnostics mode? */
bus_space_write_8(is->is_bustag, is->is_sb[i]->sb_sb,
STRBUFREG(strbuf_ctl), STRBUF_EN);
/* No streaming buffers? Disable them */
if (bus_space_read_8(is->is_bustag,
is->is_sb[i]->sb_sb,
STRBUFREG(strbuf_ctl)) == 0) {
is->is_sb[i]->sb_flush = NULL;
} else {
/*
* locate the pa of the flush buffer.
*/
(void)pmap_extract(pmap_kernel(),
(vaddr_t)is->is_sb[i]->sb_flush,
&is->is_sb[i]->sb_flushpa);
}
}
}
}
/*
* Here are the iommu control routines.
*/
void
iommu_enter(struct strbuf_ctl *sb, vaddr_t va, int64_t pa, int flags)
{
struct iommu_state *is = sb->sb_is;
int strbuf = (flags & BUS_DMA_STREAMING);
int64_t tte;
#ifdef DIAGNOSTIC
if (va < is->is_dvmabase || va > is->is_dvmaend)
panic("iommu_enter: va %#lx not in DVMA space", va);
#endif
/* Is the streamcache flush really needed? */
if (sb->sb_flush) {
iommu_strbuf_flush(sb, va);
iommu_strbuf_flush_done(sb);
} else
/* If we can't flush the strbuf don't enable it. */
strbuf = 0;
tte = MAKEIOTTE(pa, !(flags & BUS_DMA_NOWRITE),
!(flags & BUS_DMA_NOCACHE), (strbuf));
#ifdef DEBUG
tte |= (flags & 0xff000LL)<<(4*8);
#endif
DPRINTF(IDB_IOMMU, ("Clearing TSB slot %d for va %p\n",
(int)IOTSBSLOT(va,is->is_tsbsize), (void *)(u_long)va));
is->is_tsb[IOTSBSLOT(va,is->is_tsbsize)] = tte;
bus_space_write_8(is->is_bustag, is->is_iommu,
IOMMUREG(iommu_flush), va);
DPRINTF(IDB_IOMMU, ("iommu_enter: va %lx pa %lx TSB[%lx]@%p=%lx\n",
va, (long)pa, (u_long)IOTSBSLOT(va,is->is_tsbsize),
(void *)(u_long)&is->is_tsb[IOTSBSLOT(va,is->is_tsbsize)],
(u_long)tte));
}
/*
* Find the value of a DVMA address (debug routine).
*/
paddr_t
iommu_extract(struct iommu_state *is, vaddr_t dva)
{
int64_t tte = 0;
if (dva >= is->is_dvmabase && dva < is->is_dvmaend)
tte = is->is_tsb[IOTSBSLOT(dva, is->is_tsbsize)];
if ((tte & IOTTE_V) == 0)
return ((paddr_t)-1L);
return (tte & IOTTE_PAMASK);
}
/*
* iommu_remove: removes mappings created by iommu_enter
*
* Only demap from IOMMU if flag is set.
*
* XXX: this function needs better internal error checking.
*/
void
iommu_remove(struct iommu_state *is, vaddr_t va, size_t len)
{
#ifdef DIAGNOSTIC
if (va < is->is_dvmabase || va > is->is_dvmaend)
panic("iommu_remove: va 0x%lx not in DVMA space", (u_long)va);
if ((long)(va + len) < (long)va)
panic("iommu_remove: va 0x%lx + len 0x%lx wraps",
(long) va, (long) len);
if (len & ~0xfffffff)
panic("iommu_remove: ridiculous len 0x%lx", (u_long)len);
#endif
va = trunc_page(va);
DPRINTF(IDB_IOMMU, ("iommu_remove: va %lx TSB[%lx]@%p\n",
va, (u_long)IOTSBSLOT(va, is->is_tsbsize),
&is->is_tsb[IOTSBSLOT(va, is->is_tsbsize)]));
while (len > 0) {
DPRINTF(IDB_IOMMU, ("iommu_remove: clearing TSB slot %d "
"for va %p size %lx\n",
(int)IOTSBSLOT(va,is->is_tsbsize), (void *)(u_long)va,
(u_long)len));
if (len <= PAGE_SIZE)
len = 0;
else
len -= PAGE_SIZE;
/* XXX Zero-ing the entry would not require RMW */
is->is_tsb[IOTSBSLOT(va,is->is_tsbsize)] &= ~IOTTE_V;
bus_space_write_8(is->is_bustag, is->is_iommu,
IOMMUREG(iommu_flush), va);
va += PAGE_SIZE;
}
}
static int
iommu_strbuf_flush_done(struct strbuf_ctl *sb)
{
struct iommu_state *is = sb->sb_is;
struct timeval cur, flushtimeout;
#define BUMPTIME(t, usec) { \
register volatile struct timeval *tp = (t); \
register long us; \
\
tp->tv_usec = us = tp->tv_usec + (usec); \
if (us >= 1000000) { \
tp->tv_usec = us - 1000000; \
tp->tv_sec++; \
} \
}
if (!sb->sb_flush)
return (0);
/*
* Streaming buffer flushes:
*
* 1 Tell strbuf to flush by storing va to strbuf_pgflush. If
* we're not on a cache line boundary (64-bits):
* 2 Store 0 in flag
* 3 Store pointer to flag in flushsync
* 4 wait till flushsync becomes 0x1
*
* If it takes more than .5 sec, something
* went wrong.
*/
*sb->sb_flush = 0;
bus_space_write_8(is->is_bustag, sb->sb_sb,
STRBUFREG(strbuf_flushsync), sb->sb_flushpa);
microtime(&flushtimeout);
cur = flushtimeout;
BUMPTIME(&flushtimeout, 500000); /* 1/2 sec */
DPRINTF(IDB_IOMMU, ("iommu_strbuf_flush_done: flush = %lx "
"at va = %lx pa = %lx now=%lx:%lx until = %lx:%lx\n",
(long)*sb->sb_flush, (long)sb->sb_flush, (long)sb->sb_flushpa,
cur.tv_sec, cur.tv_usec,
flushtimeout.tv_sec, flushtimeout.tv_usec));
/* Bypass non-coherent D$ */
while ((!ldxa(sb->sb_flushpa, ASI_PHYS_CACHED)) &&
timercmp(&cur, &flushtimeout, <=))
microtime(&cur);
#ifdef DIAGNOSTIC
if (!ldxa(sb->sb_flushpa, ASI_PHYS_CACHED)) {
printf("iommu_strbuf_flush_done: flush timeout %p, at %p\n",
(void *)(u_long)*sb->sb_flush,
(void *)(u_long)sb->sb_flushpa); /* panic? */
#ifdef DDB
Debugger();
#endif
}
#endif
DPRINTF(IDB_IOMMU, ("iommu_strbuf_flush_done: flushed\n"));
return (*sb->sb_flush);
}
/*
* IOMMU DVMA operations, common to SBUS and PCI.
*/
int
iommu_dvmamap_load(bus_dma_tag_t t, struct strbuf_ctl *sb, bus_dmamap_t map,
void *buf, bus_size_t buflen, struct proc *p, int flags)
{
struct iommu_state *is = sb->sb_is;
int s;
int err;
bus_size_t sgsize;
paddr_t curaddr;
u_long dvmaddr, sgstart, sgend;
bus_size_t align, boundary, len;
vaddr_t vaddr = (vaddr_t)buf;
int seg;
struct pmap *pmap;
if (map->dm_nsegs) {
/* Already in use?? */
#ifdef DIAGNOSTIC
printf("iommu_dvmamap_load: map still in use\n");
#endif
bus_dmamap_unload(t, map);
}
/*
* Make sure that on error condition we return "no valid mappings".
*/
map->dm_nsegs = 0;
if (buflen > map->_dm_size) {
DPRINTF(IDB_BUSDMA,
("iommu_dvmamap_load(): error %d > %d -- "
"map size exceeded!\n", (int)buflen, (int)map->_dm_size));
return (EINVAL);
}
sgsize = round_page(buflen + ((int)vaddr & PGOFSET));
/*
* A boundary presented to bus_dmamem_alloc() takes precedence
* over boundary in the map.
*/
if ((boundary = (map->dm_segs[0]._ds_boundary)) == 0)
boundary = map->_dm_boundary;
align = max(map->dm_segs[0]._ds_align, PAGE_SIZE);
/*
* If our segment size is larger than the boundary we need to
* split the transfer up int little pieces ourselves.
*/
s = splhigh();
err = extent_alloc(is->is_dvmamap, sgsize, align,
(sgsize > boundary) ? 0 : boundary,
EX_NOWAIT|EX_BOUNDZERO, &dvmaddr);
splx(s);
#ifdef DEBUG
if (err || (dvmaddr == (u_long)-1)) {
printf("iommu_dvmamap_load(): extent_alloc(%d, %x) failed!\n",
(int)sgsize, flags);
#ifdef DDB
Debugger();
#endif
}
#endif
if (err != 0)
return (err);
if (dvmaddr == (u_long)-1)
return (ENOMEM);
/* Set the active DVMA map */
map->_dm_dvmastart = dvmaddr;
map->_dm_dvmasize = sgsize;
/*
* Now split the DVMA range into segments, not crossing
* the boundary.
*/
seg = 0;
sgstart = dvmaddr + (vaddr & PGOFSET);
sgend = sgstart + buflen - 1;
map->dm_segs[seg].ds_addr = sgstart;
DPRINTF(IDB_INFO, ("iommu_dvmamap_load: boundary %lx boundary - 1 %lx "
"~(boundary - 1) %lx\n", (long)boundary, (long)(boundary - 1),
(long)~(boundary - 1)));
while ((sgstart & ~(boundary - 1)) != (sgend & ~(boundary - 1))) {
/* Oops. We crossed a boundary. Split the xfer. */
len = boundary - (sgstart & (boundary - 1));
map->dm_segs[seg].ds_len = len;
DPRINTF(IDB_INFO, ("iommu_dvmamap_load: "
"seg %d start %lx size %lx\n", seg,
(long)map->dm_segs[seg].ds_addr,
(long)map->dm_segs[seg].ds_len));
if (++seg >= map->_dm_segcnt) {
/* Too many segments. Fail the operation. */
DPRINTF(IDB_INFO, ("iommu_dvmamap_load: "
"too many segments %d\n", seg));
s = splhigh();
/* How can this fail? And if it does what can we do? */
err = extent_free(is->is_dvmamap,
dvmaddr, sgsize, EX_NOWAIT);
map->_dm_dvmastart = 0;
map->_dm_dvmasize = 0;
splx(s);
return (EFBIG);
}
sgstart += len;
map->dm_segs[seg].ds_addr = sgstart;
}
map->dm_segs[seg].ds_len = sgend - sgstart + 1;
DPRINTF(IDB_INFO, ("iommu_dvmamap_load: "
"seg %d start %lx size %lx\n", seg,
(long)map->dm_segs[seg].ds_addr, (long)map->dm_segs[seg].ds_len));
map->dm_nsegs = seg + 1;
map->dm_mapsize = buflen;
if (p != NULL)
pmap = p->p_vmspace->vm_map.pmap;
else
pmap = pmap_kernel();
for (; buflen > 0; ) {
/*
* Get the physical address for this page.
*/
if (pmap_extract(pmap, (vaddr_t)vaddr, &curaddr) == FALSE) {
#ifdef DIAGNOSTIC
printf("iommu_dvmamap_load: pmap_extract failed %lx\n", vaddr);
#endif
bus_dmamap_unload(t, map);
return (-1);
}
/*
* Compute the segment size, and adjust counts.
*/
sgsize = PAGE_SIZE - ((u_long)vaddr & PGOFSET);
if (buflen < sgsize)
sgsize = buflen;
DPRINTF(IDB_BUSDMA,
("iommu_dvmamap_load: map %p loading va %p "
"dva %lx at pa %lx\n",
map, (void *)vaddr, (long)dvmaddr,
(long)(curaddr & ~(PAGE_SIZE-1))));
iommu_enter(sb, trunc_page(dvmaddr), trunc_page(curaddr),
flags|0x4000);
dvmaddr += PAGE_SIZE;
vaddr += sgsize;
buflen -= sgsize;
}
#ifdef DIAGNOSTIC
for (seg = 0; seg < map->dm_nsegs; seg++) {
if (map->dm_segs[seg].ds_addr < is->is_dvmabase ||
map->dm_segs[seg].ds_addr > is->is_dvmaend) {
printf("seg %d dvmaddr %lx out of range %x - %x\n",
seg, (long)map->dm_segs[seg].ds_addr,
is->is_dvmabase, is->is_dvmaend);
#ifdef DDB
Debugger();
#endif
}
}
#endif
return (0);
}
void
iommu_dvmamap_unload(bus_dma_tag_t t, struct strbuf_ctl *sb, bus_dmamap_t map)
{
struct iommu_state *is = sb->sb_is;
int error, s;
bus_size_t sgsize = map->_dm_dvmasize;
/* Flush the iommu */
#ifdef DEBUG
if (!map->_dm_dvmastart) {
printf("iommu_dvmamap_unload: No dvmastart is zero\n");
#ifdef DDB
Debugger();
#endif
}
#endif
iommu_remove(is, map->_dm_dvmastart, map->_dm_dvmasize);
/* Flush the caches */
bus_dmamap_unload(t->_parent, map);
/* Mark the mappings as invalid. */
map->dm_mapsize = 0;
map->dm_nsegs = 0;
s = splhigh();
error = extent_free(is->is_dvmamap, map->_dm_dvmastart,
map->_dm_dvmasize, EX_NOWAIT);
map->_dm_dvmastart = 0;
map->_dm_dvmasize = 0;
splx(s);
if (error != 0)
printf("warning: %qd of DVMA space lost\n", (long long)sgsize);
/* Clear the map */
}
int
iommu_dvmamap_load_raw(bus_dma_tag_t t, struct strbuf_ctl *sb, bus_dmamap_t map,
bus_dma_segment_t *segs, int nsegs, int flags, bus_size_t size)
{
struct iommu_state *is = sb->sb_is;
struct vm_page *pg;
int i, j, s;
int left;
int err;
bus_size_t sgsize;
paddr_t pa;
bus_size_t boundary, align;
u_long dvmaddr, sgstart, sgend;
struct pglist *pglist;
int pagesz = PAGE_SIZE;
int npg = 0; /* DEBUG */
if (map->dm_nsegs) {
/* Already in use?? */
#ifdef DIAGNOSTIC
printf("iommu_dvmamap_load_raw: map still in use\n");
#endif
bus_dmamap_unload(t, map);
}
/*
* A boundary presented to bus_dmamem_alloc() takes precedence
* over boundary in the map.
*/
if ((boundary = segs[0]._ds_boundary) == 0)
boundary = map->_dm_boundary;
align = max(segs[0]._ds_align, pagesz);
/*
* Make sure that on error condition we return "no valid mappings".
*/
map->dm_nsegs = 0;
/* Count up the total number of pages we need */
pa = segs[0].ds_addr;
sgsize = 0;
left = size;
for (i = 0; left && i < nsegs; i++) {
if (round_page(pa) != round_page(segs[i].ds_addr))
sgsize = round_page(sgsize);
sgsize += min(left, segs[i].ds_len);
left -= segs[i].ds_len;
pa = segs[i].ds_addr + segs[i].ds_len;
}
sgsize = round_page(sgsize) + PAGE_SIZE; /* XXX reserve extra dvma page */
s = splhigh();
/*
* If our segment size is larger than the boundary we need to
* split the transfer up into little pieces ourselves.
*/
err = extent_alloc(is->is_dvmamap, sgsize, align,
(sgsize > boundary) ? 0 : boundary,
((flags & BUS_DMA_NOWAIT) == 0 ? EX_WAITOK : EX_NOWAIT) |
EX_BOUNDZERO, &dvmaddr);
splx(s);
if (err != 0)
return (err);
#ifdef DEBUG
if (dvmaddr == (u_long)-1)
{
printf("iommu_dvmamap_load_raw(): extent_alloc(%d, %x) failed!\n",
(int)sgsize, flags);
#ifdef DDB
Debugger();
#endif
}
#endif
if (dvmaddr == (u_long)-1)
return (ENOMEM);
/* Set the active DVMA map */
map->_dm_dvmastart = dvmaddr;
map->_dm_dvmasize = sgsize;
if ((pglist = segs[0]._ds_mlist) == NULL) {
u_long prev_va = 0UL;
paddr_t prev_pa = 0;
int end = 0, offset;
/*
* This segs is made up of individual physical
* segments, probably by _bus_dmamap_load_uio() or
* _bus_dmamap_load_mbuf(). Ignore the mlist and
* load each one individually.
*/
map->dm_mapsize = size;
j = 0;
for (i = 0; i < nsegs ; i++) {
pa = segs[i].ds_addr;
offset = (pa & PGOFSET);
pa = trunc_page(pa);
dvmaddr = trunc_page(dvmaddr);
left = min(size, segs[i].ds_len);
DPRINTF(IDB_INFO, ("iommu_dvmamap_load_raw: converting "
"physseg %d start %lx size %lx\n", i,
(long)segs[i].ds_addr, (long)segs[i].ds_len));
if ((pa == prev_pa) &&
((offset != 0) || (end != offset))) {
/* We can re-use this mapping */
dvmaddr = prev_va;
}
sgstart = dvmaddr + offset;
sgend = sgstart + left - 1;
/* Are the segments virtually adjacent? */
if ((j > 0) && (end == offset) &&
((offset == 0) || (pa == prev_pa))) {
/* Just append to the previous segment. */
map->dm_segs[--j].ds_len += left;
DPRINTF(IDB_INFO, ("iommu_dvmamap_load_raw: "
"appending seg %d start %lx size %lx\n", j,
(long)map->dm_segs[j].ds_addr,
(long)map->dm_segs[j].ds_len));
} else {
if (j >= map->_dm_segcnt) {
iommu_dvmamap_unload(t, sb, map);
return (EFBIG);
}
map->dm_segs[j].ds_addr = sgstart;
map->dm_segs[j].ds_len = left;
DPRINTF(IDB_INFO, ("iommu_dvmamap_load_raw: "
"seg %d start %lx size %lx\n", j,
(long)map->dm_segs[j].ds_addr,
(long)map->dm_segs[j].ds_len));
}
end = (offset + left) & PGOFSET;
/* Check for boundary issues */
while ((sgstart & ~(boundary - 1)) !=
(sgend & ~(boundary - 1))) {
/* Need a new segment. */
map->dm_segs[j].ds_len =
boundary - (sgstart & (boundary - 1));
DPRINTF(IDB_INFO, ("iommu_dvmamap_load_raw: "
"seg %d start %lx size %lx\n", j,
(long)map->dm_segs[j].ds_addr,
(long)map->dm_segs[j].ds_len));
if (++j >= map->_dm_segcnt) {
iommu_dvmamap_unload(t, sb, map);
return (EFBIG);
}
sgstart = roundup(sgstart, boundary);
map->dm_segs[j].ds_addr = sgstart;
map->dm_segs[j].ds_len = sgend - sgstart + 1;
}
if (sgsize == 0)
panic("iommu_dmamap_load_raw: size botch");
/* Now map a series of pages. */
while (dvmaddr <= sgend) {
DPRINTF(IDB_BUSDMA,
("iommu_dvmamap_load_raw: map %p "
"loading va %lx at pa %lx\n",
map, (long)dvmaddr,
(long)(pa)));
/* Enter it if we haven't before. */
if (prev_va != dvmaddr)
iommu_enter(sb, prev_va = dvmaddr,
prev_pa = pa,
flags | (++npg << 12));
dvmaddr += pagesz;
pa += pagesz;
}
size -= left;
++j;
}
map->dm_nsegs = j;
#ifdef DIAGNOSTIC
{ int seg;
for (seg = 0; seg < map->dm_nsegs; seg++) {
if (map->dm_segs[seg].ds_addr < is->is_dvmabase ||
map->dm_segs[seg].ds_addr > is->is_dvmaend) {
printf("seg %d dvmaddr %lx out of range %x - %x\n",
seg, (long)map->dm_segs[seg].ds_addr,
is->is_dvmabase, is->is_dvmaend);
#ifdef DDB
Debugger();
#endif
}
}
}
#endif
return (0);
}
/*
* This was allocated with bus_dmamem_alloc.
* The pages are on a `pglist'.
*/
map->dm_mapsize = size;
i = 0;
sgstart = dvmaddr;
sgend = sgstart + size - 1;
map->dm_segs[i].ds_addr = sgstart;
while ((sgstart & ~(boundary - 1)) != (sgend & ~(boundary - 1))) {
/* Oops. We crossed a boundary. Split the xfer. */
map->dm_segs[i].ds_len = boundary - (sgstart & (boundary - 1));
DPRINTF(IDB_INFO, ("iommu_dvmamap_load_raw: "
"seg %d start %lx size %lx\n", i,
(long)map->dm_segs[i].ds_addr,
(long)map->dm_segs[i].ds_len));
if (++i >= map->_dm_segcnt) {
/* Too many segments. Fail the operation. */
s = splhigh();
/* How can this fail? And if it does what can we do? */
err = extent_free(is->is_dvmamap,
dvmaddr, sgsize, EX_NOWAIT);
map->_dm_dvmastart = 0;
map->_dm_dvmasize = 0;
splx(s);
return (EFBIG);
}
sgstart = roundup(sgstart, boundary);
map->dm_segs[i].ds_addr = sgstart;
}
DPRINTF(IDB_INFO, ("iommu_dvmamap_load_raw: "
"seg %d start %lx size %lx\n", i,
(long)map->dm_segs[i].ds_addr, (long)map->dm_segs[i].ds_len));
map->dm_segs[i].ds_len = sgend - sgstart + 1;
TAILQ_FOREACH(pg, pglist, pageq) {
if (sgsize == 0)
panic("iommu_dmamap_load_raw: size botch");
pa = VM_PAGE_TO_PHYS(pg);
DPRINTF(IDB_BUSDMA,
("iommu_dvmamap_load_raw: map %p loading va %lx at pa %lx\n",
map, (long)dvmaddr, (long)(pa)));
iommu_enter(sb, dvmaddr, pa, flags|0x8000);
dvmaddr += pagesz;
sgsize -= pagesz;
}
map->dm_mapsize = size;
map->dm_nsegs = i+1;
#ifdef DIAGNOSTIC
{ int seg;
for (seg = 0; seg < map->dm_nsegs; seg++) {
if (map->dm_segs[seg].ds_addr < is->is_dvmabase ||
map->dm_segs[seg].ds_addr > is->is_dvmaend) {
printf("seg %d dvmaddr %lx out of range %x - %x\n",
seg, (long)map->dm_segs[seg].ds_addr,
is->is_dvmabase, is->is_dvmaend);
#ifdef DDB
Debugger();
#endif
}
}
}
#endif
return (0);
}
/*
* Flush an individual dma segment, returns non-zero if the streaming buffers
* need flushing afterwards.
*/
static int
iommu_dvmamap_sync_range(struct strbuf_ctl *sb, vaddr_t va, bus_size_t len)
{
vaddr_t vaend;
struct iommu_state *is = sb->sb_is;
#ifdef DIAGNOSTIC
if (va < is->is_dvmabase || va > is->is_dvmaend)
panic("invalid va: %llx", (long long)va);
#endif
if ((is->is_tsb[IOTSBSLOT(va, is->is_tsbsize)] & IOTTE_STREAM) == 0) {
DPRINTF(IDB_BUSDMA,
("iommu_dvmamap_sync_range: attempting to flush "
"non-streaming entry\n"));
return (0);
}
vaend = (va + len + PGOFSET) & ~PGOFSET;
va &= ~PGOFSET;
#ifdef DIAGNOSTIC
if (va < is->is_dvmabase || vaend > is->is_dvmaend)
panic("invalid va range: %llx to %llx (%x to %x)",
(long long)va, (long long)vaend,
is->is_dvmabase,
is->is_dvmaend);
#endif
for ( ; va <= vaend; va += PAGE_SIZE) {
DPRINTF(IDB_BUSDMA,
("iommu_dvmamap_sync_range: flushing va %p\n",
(void *)(u_long)va));
iommu_strbuf_flush(sb, va);
}
return (1);
}
void
iommu_dvmamap_sync(bus_dma_tag_t t, struct strbuf_ctl *sb, bus_dmamap_t map,
bus_addr_t offset, bus_size_t len, int ops)
{
bus_size_t count;
int i, needsflush = 0;
if (!sb->sb_flush)
return;
for (i = 0; i < map->dm_nsegs; i++) {
if (offset < map->dm_segs[i].ds_len)
break;
offset -= map->dm_segs[i].ds_len;
}
if (i == map->dm_nsegs)
panic("iommu_dvmamap_sync: segment too short %llu",
(unsigned long long)offset);
if (ops & (BUS_DMASYNC_PREREAD | BUS_DMASYNC_POSTWRITE)) {
/* Nothing to do */;
}
if (ops & (BUS_DMASYNC_POSTREAD | BUS_DMASYNC_PREWRITE)) {
for (; len > 0 && i < map->dm_nsegs; i++) {
count = MIN(map->dm_segs[i].ds_len - offset, len);
if (count > 0 &&
iommu_dvmamap_sync_range(sb,
map->dm_segs[i].ds_addr + offset, count))
needsflush = 1;
offset = 0;
len -= count;
}
#ifdef DIAGNOSTIC
if (i == map->dm_nsegs && len > 0)
panic("iommu_dvmamap_sync: leftover %llu",
(unsigned long long)len);
#endif
if (needsflush)
iommu_strbuf_flush_done(sb);
}
}
int
iommu_dvmamem_alloc(bus_dma_tag_t t, struct strbuf_ctl *sb, bus_size_t size,
bus_size_t alignment, bus_size_t boundary, bus_dma_segment_t *segs,
int nsegs, int *rsegs, int flags)
{
DPRINTF(IDB_BUSDMA, ("iommu_dvmamem_alloc: sz %llx align %llx bound %llx "
"segp %p flags %d\n", (unsigned long long)size,
(unsigned long long)alignment, (unsigned long long)boundary,
segs, flags));
return (bus_dmamem_alloc(t->_parent, size, alignment, boundary,
segs, nsegs, rsegs, flags|BUS_DMA_DVMA));
}
void
iommu_dvmamem_free(bus_dma_tag_t t, struct strbuf_ctl *sb,
bus_dma_segment_t *segs, int nsegs)
{
DPRINTF(IDB_BUSDMA, ("iommu_dvmamem_free: segp %p nsegs %d\n",
segs, nsegs));
bus_dmamem_free(t->_parent, segs, nsegs);
}
/*
* Map the DVMA mappings into the kernel pmap.
* Check the flags to see whether we're streaming or coherent.
*/
int
iommu_dvmamem_map(bus_dma_tag_t t, struct strbuf_ctl *sb,
bus_dma_segment_t *segs, int nsegs, size_t size, void **kvap,
int flags)
{
struct vm_page *pg;
vaddr_t va;
bus_addr_t addr;
struct pglist *pglist;
int cbit;
const uvm_flag_t kmflags =
(flags & BUS_DMA_NOWAIT) != 0 ? UVM_KMF_NOWAIT : 0;
DPRINTF(IDB_BUSDMA, ("iommu_dvmamem_map: segp %p nsegs %d size %lx\n",
segs, nsegs, size));
/*
* Allocate some space in the kernel map, and then map these pages
* into this space.
*/
size = round_page(size);
va = uvm_km_alloc(kernel_map, size, 0, UVM_KMF_VAONLY | kmflags);
if (va == 0)
return (ENOMEM);
*kvap = (void *)va;
/*
* digest flags:
*/
cbit = 0;
if (flags & BUS_DMA_COHERENT) /* Disable vcache */
cbit |= PMAP_NVC;
if (flags & BUS_DMA_NOCACHE) /* sideffects */
cbit |= PMAP_NC;
/*
* Now take this and map it into the CPU.
*/
pglist = segs[0]._ds_mlist;
TAILQ_FOREACH(pg, pglist, pageq) {
#ifdef DIAGNOSTIC
if (size == 0)
panic("iommu_dvmamem_map: size botch");
#endif
addr = VM_PAGE_TO_PHYS(pg);
DPRINTF(IDB_BUSDMA, ("iommu_dvmamem_map: "
"mapping va %lx at %llx\n", va, (unsigned long long)addr | cbit));
pmap_kenter_pa(va, addr | cbit, VM_PROT_READ | VM_PROT_WRITE);
va += PAGE_SIZE;
size -= PAGE_SIZE;
}
pmap_update(pmap_kernel());
return (0);
}
/*
* Unmap DVMA mappings from kernel
*/
void
iommu_dvmamem_unmap(bus_dma_tag_t t, struct strbuf_ctl *sb, void *kva,
size_t size)
{
DPRINTF(IDB_BUSDMA, ("iommu_dvmamem_unmap: kvm %p size %lx\n",
kva, size));
#ifdef DIAGNOSTIC
if ((u_long)kva & PGOFSET)
panic("iommu_dvmamem_unmap");
#endif
size = round_page(size);
pmap_kremove((vaddr_t)kva, size);
pmap_update(pmap_kernel());
uvm_km_free(kernel_map, (vaddr_t)kva, size, UVM_KMF_VAONLY);
}
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