/*
* Common function for loading a DMA map with a linear buffer. May
* be called by bus-specific DMA map load functions.
*/
int
bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map,
void *buf, bus_size_t buflen, struct proc *p, int flags)
{
paddr_t lastaddr = 0;
int seg, error;
struct vmspace *vm;
/*
* Make sure that on error condition we return "no valid mappings".
*/
map->dm_mapsize = 0;
map->dm_nsegs = 0;
KASSERT(map->dm_maxsegsz <= map->_dm_maxmaxsegsz);
if (buflen > map->_dm_size)
return (EINVAL);
if (p != NULL) {
vm = p->p_vmspace;
} else {
vm = vmspace_kernel();
}
seg = 0;
error = _bus_dmamap_load_buffer(t, map, buf, buflen, vm, flags,
&lastaddr, &seg, 1);
if (error == 0) {
map->dm_mapsize = buflen;
map->dm_nsegs = seg + 1;
}
return (error);
}
/*
* Like _bus_dmamap_load(), but for mbufs.
*/
int
_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m0,
int flags)
{
vaddr_t lastaddr;
int seg, error, first;
struct mbuf *m;
/*
* Make sure that on error condition we return "no valid mappings."
*/
map->dm_mapsize = 0;
map->dm_nsegs = 0;
KASSERT(map->dm_maxsegsz <= map->_dm_maxmaxsegsz);
#ifdef DIAGNOSTIC
if ((m0->m_flags & M_PKTHDR) == 0)
panic("_bus_dmamap_load_mbuf: no packet header");
#endif
if (m0->m_pkthdr.len > map->_dm_size)
return EINVAL;
first = 1;
seg = 0;
error = 0;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
if (m->m_len == 0)
continue;
error = _bus_dmamap_load_buffer(map, m->m_data, m->m_len,
vmspace_kernel(), flags, &lastaddr, &seg, first);
first = 0;
}
if (error == 0) {
map->dm_mapsize = m0->m_pkthdr.len;
map->dm_nsegs = seg + 1;
map->_dm_vmspace = vmspace_kernel(); /* always kernel */
}
return error;
}
/*
* Like _bus_dmamap_load(), but for raw memory.
*/
int
_bus_dmamap_load_raw(bus_dma_tag_t t, bus_dmamap_t map,
bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags)
{
struct vmspace * const vm = vmspace_kernel();
const bool coherent_p = (mips_options.mips_cpu_flags & CPU_MIPS_D_CACHE_COHERENT);
const bool cached_p = coherent_p || (flags & BUS_DMA_COHERENT) == 0;
bus_size_t mapsize = 0;
bool first = true;
int curseg = 0;
int error = 0;
for (; error == 0 && nsegs-- > 0; segs++) {
void *kva;
#ifdef _LP64
if (cached_p) {
kva = (void *)MIPS_PHYS_TO_XKPHYS_CACHED(segs->ds_addr);
} else {
kva = (void *)MIPS_PHYS_TO_XKPHYS_UNCACHED(segs->ds_addr);
}
#else
if (segs->ds_addr >= MIPS_PHYS_MASK)
return EFBIG;
if (cached_p) {
kva = (void *)MIPS_PHYS_TO_KSEG0(segs->ds_addr);
} else {
kva = (void *)MIPS_PHYS_TO_KSEG1(segs->ds_addr);
}
#endif /* _LP64 */
mapsize += segs->ds_len;
error = _bus_dmamap_load_buffer(t, map, kva, segs->ds_len,
vm, flags, &curseg, first);
first = false;
}
if (error == 0) {
map->dm_mapsize = mapsize;
map->dm_nsegs = curseg + 1;
map->_dm_vmspace = vm; /* always kernel */
/*
* If our cache is coherent, then the map must be coherent too.
*/
if (coherent_p)
map->_dm_flags |= _BUS_DMAMAP_COHERENT;
return 0;
}
/*
* If bus_dmamem_alloc didn't return memory that didn't need bouncing
* that's a bug which we will not workaround.
*/
return error;
}
static int
_bus_dma_load_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
size_t buflen, int buftype, int flags)
{
struct mips_bus_dma_cookie * const cookie = map->_dm_cookie;
struct vmspace * const vm = vmspace_kernel();
int seg, error;
KASSERT(cookie != NULL);
KASSERT(cookie->id_flags & _BUS_DMA_MIGHT_NEED_BOUNCE);
/*
* Allocate bounce pages, if necessary.
*/
if ((cookie->id_flags & _BUS_DMA_HAS_BOUNCE) == 0) {
error = _bus_dma_alloc_bouncebuf(t, map, buflen, flags);
if (error)
return (error);
}
/*
* Cache a pointer to the caller's buffer and load the DMA map
* with the bounce buffer.
*/
cookie->id_origbuf = buf;
cookie->id_origbuflen = buflen;
cookie->id_buftype = buftype;
seg = 0;
error = _bus_dmamap_load_buffer(t, map, cookie->id_bouncebuf,
buflen, vm, flags, &seg, true);
if (error)
return (error);
STAT_INCR(bounced_loads);
map->dm_mapsize = buflen;
map->dm_nsegs = seg + 1;
map->_dm_vmspace = vm;
/*
* If our cache is coherent, then the map must be coherent too.
*/
if (mips_options.mips_cpu_flags & CPU_MIPS_D_CACHE_COHERENT)
map->_dm_flags |= _BUS_DMAMAP_COHERENT;
/* ...so _bus_dmamap_sync() knows we're bouncing */
cookie->id_flags |= _BUS_DMA_IS_BOUNCING;
return 0;
}
/*
* Common function for loading a direct-mapped DMA map with a linear
* buffer.
*/
int
_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
bus_size_t buflen, struct proc *p, int flags)
{
vaddr_t lastaddr;
int seg, error;
struct vmspace *vm;
/*
* Make sure that on error condition we return "no valid mappings".
*/
map->dm_mapsize = 0;
map->dm_nsegs = 0;
KASSERT(map->dm_maxsegsz <= map->_dm_maxmaxsegsz);
if (buflen > map->_dm_size)
return EINVAL;
if (p != NULL) {
vm = p->p_vmspace;
} else {
vm = vmspace_kernel();
}
seg = 0;
error = _bus_dmamap_load_buffer(map, buf, buflen,
vm, flags, &lastaddr, &seg, 1);
if (error == 0) {
map->dm_mapsize = buflen;
map->dm_nsegs = seg + 1;
map->_dm_vmspace = vm;
/*
* For linear buffers, we support marking the mapping
* as COHERENT.
*
* XXX Check TLB entries for cache-inhibit bits?
*/
if (buf >= (void *)MIPS_KSEG1_START &&
buf < (void *)MIPS_KSEG2_START)
map->_dm_flags |= NEWSMIPS_DMAMAP_COHERENT;
}
return error;
}
/*
* function for loading a direct-mapped DMA map with a linear buffer.
*/
int
jazz_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
bus_size_t buflen, struct proc *p, int flags)
{
int error;
if ((map->_dm_flags & BUS_DMA_ALLOCNOW) != 0) {
/* just use pre-allocated DMA TLB for the buffer */
jazz_tlbmap_t tlbmap;
bus_size_t off;
struct vmspace *vm;
if (p != NULL) {
vm = p->p_vmspace;
} else {
vm = vmspace_kernel();
}
tlbmap = (jazz_tlbmap_t)map->_dm_cookie;
off = jazz_dma_page_offs(buf);
jazz_dmatlb_map_va(vm, (vaddr_t)buf, buflen, tlbmap->ptebase);
map->dm_segs[0].ds_addr = tlbmap->vaddr + off;
map->dm_segs[0].ds_len = buflen;
map->dm_segs[0]._ds_vaddr = (vaddr_t)buf;
map->dm_mapsize = buflen;
map->dm_nsegs = 1;
map->_dm_vmspace = vm;
if (buf >= (void *)MIPS_KSEG1_START &&
buf < (void *)MIPS_KSEG2_START)
map->_dm_flags |= ARC_DMAMAP_COHERENT;
return 0;
}
error = _bus_dmamap_load(t, map, buf, buflen, p, flags);
if (error == 0) {
/* allocate DMA TLB for each dmamap segment */
error = jazz_bus_dmamap_alloc_sgmap(t, map->dm_segs,
map->dm_nsegs, map->_dm_boundary, flags);
}
return error;
}
/*
* Like _bus_dmamap_load(), but for mbufs.
*/
int
_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map,
struct mbuf *m0, int flags)
{
int seg, error;
struct mbuf *m;
struct vmspace * vm = vmspace_kernel();
bool first;
if (map->dm_nsegs > 0) {
#ifdef _MIPS_NEED_BUS_DMA_BOUNCE
struct mips_bus_dma_cookie *cookie = map->_dm_cookie;
if (cookie != NULL) {
if (cookie->id_flags & _BUS_DMA_IS_BOUNCING) {
STAT_INCR(bounced_unloads);
cookie->id_flags &= ~_BUS_DMA_IS_BOUNCING;
}
cookie->id_buftype = _BUS_DMA_BUFTYPE_INVALID;
} else
#endif
STAT_INCR(unloads);
}
/*
* Make sure that on error condition we return "no valid mappings."
*/
map->dm_mapsize = 0;
map->dm_nsegs = 0;
KASSERT(map->dm_maxsegsz <= map->_dm_maxmaxsegsz);
#ifdef DIAGNOSTIC
if ((m0->m_flags & M_PKTHDR) == 0)
panic("_bus_dmamap_load_mbuf: no packet header");
#endif
if (m0->m_pkthdr.len > map->_dm_size)
return (EINVAL);
first = true;
seg = 0;
error = 0;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
if (m->m_len == 0)
continue;
error = _bus_dmamap_load_buffer(t, map, m->m_data, m->m_len,
vm, flags, &seg, first);
first = false;
}
if (error == 0) {
map->dm_mapsize = m0->m_pkthdr.len;
map->dm_nsegs = seg + 1;
map->_dm_vmspace = vm; /* always kernel */
/*
* If our cache is coherent, then the map must be coherent too.
*/
if (mips_options.mips_cpu_flags & CPU_MIPS_D_CACHE_COHERENT)
map->_dm_flags |= _BUS_DMAMAP_COHERENT;
return 0;
}
#ifdef _MIPS_NEED_BUS_DMA_BOUNCE
struct mips_bus_dma_cookie * cookie = map->_dm_cookie;
if (cookie != NULL && (cookie->id_flags & _BUS_DMA_MIGHT_NEED_BOUNCE)) {
error = _bus_dma_load_bouncebuf(t, map, m0, m0->m_pkthdr.len,
_BUS_DMA_BUFTYPE_MBUF, flags);
}
#endif /* _MIPS_NEED_BUS_DMA_BOUNCE */
return (error);
}
/*
* Common function for loading a direct-mapped DMA map with a linear
* buffer. Called by bus-specific DMA map load functions with the
* OR value appropriate for indicating "direct-mapped" for that
* chipset.
*/
int
_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
bus_size_t buflen, struct proc *p, int flags)
{
int seg, error;
struct vmspace *vm;
if (map->dm_nsegs > 0) {
#ifdef _MIPS_NEED_BUS_DMA_BOUNCE
struct mips_bus_dma_cookie *cookie = map->_dm_cookie;
if (cookie != NULL) {
if (cookie->id_flags & _BUS_DMA_IS_BOUNCING) {
STAT_INCR(bounced_unloads);
cookie->id_flags &= ~_BUS_DMA_IS_BOUNCING;
}
cookie->id_buftype = _BUS_DMA_BUFTYPE_INVALID;
} else
#endif
STAT_INCR(unloads);
}
/*
* Make sure that on error condition we return "no valid mappings".
*/
map->dm_mapsize = 0;
map->dm_nsegs = 0;
KASSERT(map->dm_maxsegsz <= map->_dm_maxmaxsegsz);
if (buflen > map->_dm_size)
return (EINVAL);
if (p != NULL) {
vm = p->p_vmspace;
} else {
vm = vmspace_kernel();
}
seg = 0;
error = _bus_dmamap_load_buffer(t, map, buf, buflen,
vm, flags, &seg, true);
if (error == 0) {
map->dm_mapsize = buflen;
map->dm_nsegs = seg + 1;
map->_dm_vmspace = vm;
STAT_INCR(loads);
/*
* For linear buffers, we support marking the mapping
* as COHERENT.
*
* XXX Check TLB entries for cache-inhibit bits?
*/
if (mips_options.mips_cpu_flags & CPU_MIPS_D_CACHE_COHERENT)
map->_dm_flags |= _BUS_DMAMAP_COHERENT;
else if (MIPS_KSEG1_P(buf))
map->_dm_flags |= _BUS_DMAMAP_COHERENT;
#ifdef _LP64
else if (MIPS_XKPHYS_P((vaddr_t)buf)
&& MIPS_XKPHYS_TO_CCA((vaddr_t)buf) == MIPS3_PG_TO_CCA(MIPS3_PG_UNCACHED))
map->_dm_flags |= _BUS_DMAMAP_COHERENT;
#endif
return 0;
}
#ifdef _MIPS_NEED_BUS_DMA_BOUNCE
struct mips_bus_dma_cookie *cookie = map->_dm_cookie;
if (cookie != NULL && (cookie->id_flags & _BUS_DMA_MIGHT_NEED_BOUNCE)) {
error = _bus_dma_load_bouncebuf(t, map, buf, buflen,
_BUS_DMA_BUFTYPE_LINEAR, flags);
}
#endif
return (error);
}
/*
* Like _bus_dmamap_load(), but for mbufs.
*/
int
bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map,
struct mbuf *m0, int flags)
{
paddr_t lastaddr = 0;
int seg, error, first;
struct mbuf *m;
/*
* Make sure that on error condition we return "no valid mappings."
*/
map->dm_mapsize = 0;
map->dm_nsegs = 0;
KASSERT(map->dm_maxsegsz <= map->_dm_maxmaxsegsz);
#ifdef DIAGNOSTIC
if ((m0->m_flags & M_PKTHDR) == 0)
panic("_bus_dmamap_load_mbuf: no packet header");
#endif
if (m0->m_pkthdr.len > map->_dm_size)
return (EINVAL);
first = 1;
seg = 0;
error = 0;
for (m = m0; m != NULL && error == 0; m = m->m_next, first = 0) {
if (m->m_len == 0)
continue;
#ifdef POOL_VTOPHYS
/* XXX Could be better about coalescing. */
/* XXX Doesn't check boundaries. */
switch (m->m_flags & (M_EXT|M_CLUSTER)) {
case M_EXT|M_CLUSTER:
/* XXX KDASSERT */
KASSERT(m->m_ext.ext_paddr != M_PADDR_INVALID);
lastaddr = m->m_ext.ext_paddr +
(m->m_data - m->m_ext.ext_buf);
have_addr:
if (first == 0 && ++seg >= map->_dm_segcnt) {
error = EFBIG;
continue;
}
map->dm_segs[seg].ds_addr =
rumpcomp_pci_virt_to_mach((void *)lastaddr);
map->dm_segs[seg].ds_len = m->m_len;
lastaddr += m->m_len;
continue;
case 0:
lastaddr = m->m_paddr + M_BUFOFFSET(m) +
(m->m_data - M_BUFADDR(m));
goto have_addr;
default:
break;
}
#endif
error = _bus_dmamap_load_buffer(t, map, m->m_data,
m->m_len, vmspace_kernel(), flags, &lastaddr, &seg, first);
}
if (error == 0) {
map->dm_mapsize = m0->m_pkthdr.len;
map->dm_nsegs = seg + 1;
}
return (error);
}
