/*
* Get the scsi driver to send a full inquiry to the device and use the
* results to fill out the disk parameter structure.
*/
int
cd_get_parms(struct cd_softc *cd, int flags)
{
/* Reasonable defaults for drives that don't support READ_CAPACITY */
cd->params.blksize = 2048;
cd->params.disksize = 400000;
if (cd->sc_link->quirks & ADEV_NOCAPACITY)
return (0);
cd->params.disksize = scsi_size(cd->sc_link, flags,
&cd->params.blksize);
if ((cd->params.blksize < 512) || ((cd->params.blksize & 511) != 0))
cd->params.blksize = 2048; /* some drives lie ! */
if (cd->params.disksize < 100)
cd->params.disksize = 400000;
return (0);
}
/*
* Fill out the disk parameter structure. Return SDGP_RESULT_OK if the
* structure is correctly filled in, SDGP_RESULT_OFFLINE otherwise. The caller
* is responsible for clearing the SDEV_MEDIA_LOADED flag if the structure
* cannot be completed.
*/
int
sd_get_parms(struct sd_softc *sc, struct disk_parms *dp, int flags)
{
union scsi_mode_sense_buf *buf = NULL;
struct page_rigid_geometry *rigid;
struct page_flex_geometry *flex;
struct page_reduced_geometry *reduced;
u_int32_t heads = 0, sectors = 0, cyls = 0, blksize = 0, ssblksize;
u_int16_t rpm = 0;
dp->disksize = scsi_size(sc->sc_link, flags, &ssblksize);
/*
* Many UMASS devices choke when asked about their geometry. Most
* don't have a meaningful geometry anyway, so just fake it if
* scsi_size() worked.
*/
if ((sc->sc_link->flags & SDEV_UMASS) && (dp->disksize > 0))
goto validate; /* N.B. buf will be NULL at validate. */
buf = malloc(sizeof(*buf), M_TEMP, M_NOWAIT);
if (buf == NULL)
goto validate;
switch (sc->sc_link->inqdata.device & SID_TYPE) {
case T_OPTICAL:
/* No more information needed or available. */
break;
case T_RDIRECT:
/* T_RDIRECT supports only PAGE_REDUCED_GEOMETRY (6). */
scsi_do_mode_sense(sc->sc_link, PAGE_REDUCED_GEOMETRY, buf,
(void **)&reduced, NULL, NULL, &blksize, sizeof(*reduced),
flags | SCSI_SILENT, NULL);
if (DISK_PGCODE(reduced, PAGE_REDUCED_GEOMETRY)) {
if (dp->disksize == 0)
dp->disksize = _5btol(reduced->sectors);
if (blksize == 0)
blksize = _2btol(reduced->bytes_s);
}
break;
default:
/*
* NOTE: Some devices leave off the last four bytes of
* PAGE_RIGID_GEOMETRY and PAGE_FLEX_GEOMETRY mode sense pages.
* The only information in those four bytes is RPM information
* so accept the page. The extra bytes will be zero and RPM will
* end up with the default value of 3600.
*/
rigid = NULL;
if (((sc->sc_link->flags & SDEV_ATAPI) == 0) ||
((sc->sc_link->flags & SDEV_REMOVABLE) == 0))
scsi_do_mode_sense(sc->sc_link, PAGE_RIGID_GEOMETRY,
buf, (void **)&rigid, NULL, NULL, &blksize,
sizeof(*rigid) - 4, flags | SCSI_SILENT, NULL);
if (DISK_PGCODE(rigid, PAGE_RIGID_GEOMETRY)) {
heads = rigid->nheads;
cyls = _3btol(rigid->ncyl);
rpm = _2btol(rigid->rpm);
if (heads * cyls > 0)
sectors = dp->disksize / (heads * cyls);
} else {
scsi_do_mode_sense(sc->sc_link, PAGE_FLEX_GEOMETRY,
buf, (void **)&flex, NULL, NULL, &blksize,
sizeof(*flex) - 4, flags | SCSI_SILENT, NULL);
if (DISK_PGCODE(flex, PAGE_FLEX_GEOMETRY)) {
sectors = flex->ph_sec_tr;
heads = flex->nheads;
cyls = _2btol(flex->ncyl);
rpm = _2btol(flex->rpm);
if (blksize == 0)
blksize = _2btol(flex->bytes_s);
if (dp->disksize == 0)
dp->disksize = heads * cyls * sectors;
}
}
break;
}
validate:
if (buf)
free(buf, M_TEMP);
if (dp->disksize == 0)
return (SDGP_RESULT_OFFLINE);
if (ssblksize > 0)
dp->blksize = ssblksize;
else
dp->blksize = (blksize == 0) ? 512 : blksize;
/*
* Restrict blksize values to powers of two between 512 and 64k.
*/
switch (dp->blksize) {
case 0x200: /* == 512, == DEV_BSIZE on all architectures. */
case 0x400:
case 0x800:
case 0x1000:
case 0x2000:
case 0x4000:
case 0x8000:
case 0x10000:
break;
default:
SC_DEBUG(sc->sc_link, SDEV_DB1,
("sd_get_parms: bad blksize: %#x\n", dp->blksize));
return (SDGP_RESULT_OFFLINE);
}
/*
* XXX THINK ABOUT THIS!! Using values such that sectors * heads *
* cyls is <= disk_size can lead to wasted space. We need a more
* careful calculation/validation to make everything work out
* optimally.
*/
if (dp->disksize > 0xffffffff && (dp->heads * dp->sectors) < 0xffff) {
dp->heads = 511;
dp->sectors = 255;
cyls = 0;
} else {
/*
* Use standard geometry values for anything we still don't
* know.
*/
dp->heads = (heads == 0) ? 255 : heads;
dp->sectors = (sectors == 0) ? 63 : sectors;
dp->rot_rate = (rpm == 0) ? 3600 : rpm;
}
dp->cyls = (cyls == 0) ? dp->disksize / (dp->heads * dp->sectors) :
cyls;
if (dp->cyls == 0) {
dp->heads = dp->cyls = 1;
dp->sectors = dp->disksize;
}
return (SDGP_RESULT_OK);
}
