diff options
| author | Brad Smith <brad@cvs.openbsd.org> | 2006-04-04 21:20:41 +0000 |
|---|---|---|
| committer | Brad Smith <brad@cvs.openbsd.org> | 2006-04-04 21:20:41 +0000 |
| commit | 847f0d652dcf6c9019be074ee1f04b6ed4ff788a (patch) | |
| tree | 477cef55159c6b92d441b89938f28d87e5b6c5e3 /sys/arch/alpha/pci/cia_dma.c | |
| parent | 6e1fce54ffe410977ee0c4d562ab9a698eb55496 (diff) | |
Add a `prefetch threshold' member to the bus_dma_tag_t, so that
eventually we can determine whether or not to allocate a spill
page on a per-mapping basis.
From NetBSD
ok martin@
Diffstat (limited to 'sys/arch/alpha/pci/cia_dma.c')
| -rw-r--r-- | sys/arch/alpha/pci/cia_dma.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sys/arch/alpha/pci/cia_dma.c b/sys/arch/alpha/pci/cia_dma.c index 37394c9e799..5cc6c2a3fb4 100644 --- a/sys/arch/alpha/pci/cia_dma.c +++ b/sys/arch/alpha/pci/cia_dma.c @@ -1,4 +1,4 @@ -/* $OpenBSD: cia_dma.c,v 1.6 2006/03/20 01:00:58 martin Exp $ */ +/* $OpenBSD: cia_dma.c,v 1.7 2006/04/04 21:20:40 brad Exp $ */ /* $NetBSD: cia_dma.c,v 1.16 2000/06/29 08:58:46 mrg Exp $ */ /*- @@ -90,6 +90,9 @@ void cia_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); #define CIA_SGMAP_MAPPED_BASE (8*1024*1024) #define CIA_SGMAP_MAPPED_SIZE (8*1024*1024) +/* ALCOR/ALGOR2/PYXIS have a 256-byte out-bound DMA prefetch threshold. */ +#define CIA_SGMAP_PFTHRESH 256 + void cia_tlb_invalidate(void); void cia_broken_pyxis_tlb_invalidate(void); @@ -144,6 +147,7 @@ cia_dma_init(ccp) t->_next_window = NULL; t->_boundary = 0; t->_sgmap = &ccp->cc_sgmap; + t->_pfthresh = CIA_SGMAP_PFTHRESH; t->_get_tag = cia_dma_get_tag; t->_dmamap_create = alpha_sgmap_dmamap_create; t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; |