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Add a loader tunable, kern.cam.ctl.disable, that will disable

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loading CTL.  This may be useful in very low memory installations.

MFC after:	3 days
This commit is contained in:
Kenneth D. Merry 2012-06-28 19:39:30 +00:00
parent d7f7144a73
commit beedaee94a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=237726
5 changed files with 33 additions and 1 deletions
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10
sys/cam/ctl/ctl.c
View File

@ -308,7 +308,6 @@ static struct scsi_control_page control_page_changeable = {
/*aen_holdoff_period*/{0, 0}
};
SYSCTL_NODE(_kern_cam, OID_AUTO, ctl, CTLFLAG_RD, 0, "CAM Target Layer");
/*
* XXX KDM move these into the softc.
@ -318,7 +317,12 @@ static int persis_offset;
static uint8_t ctl_pause_rtr;
static int ctl_is_single;
static int index_to_aps_page;
int ctl_disable = 0;
SYSCTL_NODE(_kern_cam, OID_AUTO, ctl, CTLFLAG_RD, 0, "CAM Target Layer");
SYSCTL_INT(_kern_cam_ctl, OID_AUTO, disable, CTLFLAG_RDTUN, &ctl_disable, 0,
"Disable CTL");
TUNABLE_INT("kern.cam.ctl.disable", &ctl_disable);
/*
* Serial number (0x80), device id (0x83), and supported pages (0x00)
@ -949,6 +953,10 @@ ctl_init(void)
ctl_pause_rtr = 0;
rcv_sync_msg = 0;
/* If we're disabled, don't initialize. */
if (ctl_disable != 0)
return;
control_softc = malloc(sizeof(*control_softc), M_DEVBUF, M_WAITOK);
softc = control_softc;

5
sys/cam/ctl/ctl_backend.c
View File

@ -62,6 +62,7 @@ __FBSDID("$FreeBSD$");
#include <cam/ctl/ctl_debug.h>
extern struct ctl_softc *control_softc;
extern int ctl_disable;
int
ctl_backend_register(struct ctl_backend_driver *be)
@ -71,6 +72,10 @@ ctl_backend_register(struct ctl_backend_driver *be)
ctl_softc = control_softc;
/* Don't continue if CTL is disabled */
if (ctl_disable != 0)
return (0);
mtx_lock(&ctl_softc->ctl_lock);
/*
* Sanity check, make sure this isn't a duplicate registration.

5
sys/cam/ctl/ctl_frontend_cam_sim.c
View File

@ -119,6 +119,7 @@ struct cfcs_softc cfcs_softc;
* amount of SCSI sense data that we will report to CAM.
*/
static int cfcs_max_sense = sizeof(struct scsi_sense_data);
extern int ctl_disable;
SYSINIT(cfcs_init, SI_SUB_CONFIGURE, SI_ORDER_FOURTH, cfcs_init, NULL);
SYSCTL_NODE(_kern_cam, OID_AUTO, ctl2cam, CTLFLAG_RD, 0,
@ -138,6 +139,10 @@ cfcs_init(void)
#endif
int retval;
/* Don't continue if CTL is disabled */
if (ctl_disable != 0)
return (0);
softc = &cfcs_softc;
retval = 0;
bzero(softc, sizeof(*softc));

5
sys/cam/ctl/ctl_frontend_internal.c
View File

@ -187,6 +187,7 @@ struct cfi_softc {
MALLOC_DEFINE(M_CTL_CFI, "ctlcfi", "CTL CFI");
static struct cfi_softc fetd_internal_softc;
extern int ctl_disable;
void cfi_init(void);
void cfi_shutdown(void) __unused;
@ -231,6 +232,10 @@ cfi_init(void)
retval = 0;
/* If we're disabled, don't initialize */
if (ctl_disable != 0)
return;
if (sizeof(struct cfi_lun_io) > CTL_PORT_PRIV_SIZE) {
printf("%s: size of struct cfi_lun_io %zd > "
"CTL_PORT_PRIV_SIZE %d\n", __func__,

9
sys/cam/ctl/scsi_ctl.c
View File

@ -227,12 +227,17 @@ static struct periph_driver ctlfe_driver =
PERIPHDRIVER_DECLARE(ctl, ctlfe_driver);
extern struct ctl_softc *control_softc;
extern int ctl_disable;
int
ctlfeinitialize(void)
{
cam_status status;
/* Don't initialize if we're disabled */
if (ctl_disable != 0)
return (0);
STAILQ_INIT(&ctlfe_softc_list);
mtx_init(&ctlfe_list_mtx, ctlfe_mtx_desc, NULL, MTX_DEF);
@ -263,6 +268,10 @@ ctlfeinit(void)
{
cam_status status;
/* Don't initialize if we're disabled */
if (ctl_disable != 0)
return;
STAILQ_INIT(&ctlfe_softc_list);
mtx_init(&ctlfe_list_mtx, ctlfe_mtx_desc, NULL, MTX_DEF);