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Hack around a bug in the 2200 and 2120 controllers that connot DMA

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commands from below the first 8K of physical memory.  A better fix
is to modify the busdma api to allow either inclusion ranges or
multiple exclusion ranges, but that debate is for another day.

MFC After:	2 days
This commit is contained in:
Scott Long 2003-01-23 01:01:44 +00:00
parent 2fbe601a5d
commit 128aa5a022
2 changed files with 18 additions and 4 deletions
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20
sys/dev/aac/aac.c
View file

@ -259,7 +259,8 @@ aac_attach(struct aac_softc *sc)
return(error);
/*
* Allocate command structures.
* Allocate command structures. This must be done before aac_init()
* in order to work around a 2120/2200 bug.
*/
if ((error = aac_alloc_commands(sc)) != 0)
return(error);
@ -1119,11 +1120,24 @@ aac_alloc_commands(struct aac_softc *sc)
printf("Not enough contiguous memory available.\n");
return (ENOMEM);
}
/*
* Work around a bug in the 2120 and 2200 that cannot DMA commands
* below address 8192 in physical memory.
* XXX If the padding is not needed, can it be put to use instead
* of ignored?
*/
bus_dmamap_load(sc->aac_fib_dmat, sc->aac_fibmap, sc->aac_fibs,
AAC_FIB_COUNT * sizeof(struct aac_fib),
8192 + AAC_FIB_COUNT * sizeof(struct aac_fib),
aac_map_command_helper, sc, 0);
bzero(sc->aac_fibs, AAC_FIB_COUNT * sizeof(struct aac_fib));
if (sc->aac_fibphys < 8192) {
sc->aac_fibs += (8192 / sizeof(struct aac_fib));
sc->aac_fibphys += 8192;
}
/* initialise constant fields in the command structure */
bzero(sc->aac_fibs, AAC_FIB_COUNT * sizeof(struct aac_fib));
for (i = 0; i < AAC_FIB_COUNT; i++) {
cm = &sc->aac_command[i];
cm->cm_sc = sc;

2
sys/dev/aac/aac_pci.c
View file

@ -275,7 +275,7 @@ aac_pci_attach(device_t dev)
BUS_SPACE_MAXADDR, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
AAC_FIB_COUNT *
8192 + AAC_FIB_COUNT * /* XXX dma hack */
sizeof(struct aac_fib), 1, /* maxsize, nsegments */
BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */
0, /* flags */