diff options
Diffstat (limited to 'sys/cam/ctl/ctl_backend.c')
| -rw-r--r-- | sys/cam/ctl/ctl_backend.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/sys/cam/ctl/ctl_backend.c b/sys/cam/ctl/ctl_backend.c new file mode 100644 index 0000000..cd0d6cc --- /dev/null +++ b/sys/cam/ctl/ctl_backend.c @@ -0,0 +1,177 @@ +/*- + * Copyright (c) 2003 Silicon Graphics International Corp. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + * + * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.c#3 $ + */ +/* + * CTL backend driver registration routines + * + * Author: Ken Merry <ken@FreeBSD.org> + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/types.h> +#include <sys/malloc.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/condvar.h> +#include <sys/queue.h> + +#include <cam/scsi/scsi_all.h> +#include <cam/scsi/scsi_da.h> +#include <cam/ctl/ctl_io.h> +#include <cam/ctl/ctl.h> +#include <cam/ctl/ctl_frontend.h> +#include <cam/ctl/ctl_backend.h> +#include <cam/ctl/ctl_frontend_internal.h> +#include <cam/ctl/ctl_ioctl.h> +#include <cam/ctl/ctl_ha.h> +#include <cam/ctl/ctl_private.h> +#include <cam/ctl/ctl_debug.h> + +extern struct ctl_softc *control_softc; + +int +ctl_backend_register(struct ctl_backend_driver *be) +{ + struct ctl_softc *ctl_softc; + struct ctl_backend_driver *be_tmp; + + ctl_softc = control_softc; + + mtx_lock(&ctl_softc->ctl_lock); + /* + * Sanity check, make sure this isn't a duplicate registration. + */ + STAILQ_FOREACH(be_tmp, &ctl_softc->be_list, links) { + if (strcmp(be_tmp->name, be->name) == 0) { + mtx_unlock(&ctl_softc->ctl_lock); + return (-1); + } + } + mtx_unlock(&ctl_softc->ctl_lock); + + /* + * Call the backend's initialization routine. + */ + be->init(); + + mtx_lock(&ctl_softc->ctl_lock); + + STAILQ_INSERT_TAIL(&ctl_softc->be_list, be, links); + + ctl_softc->num_backends++; + + /* + * Don't want to increment the usage count for internal consumers, + * we won't be able to unload otherwise. + */ + /* XXX KDM find a substitute for this? */ +#if 0 + if ((be->flags & CTL_BE_FLAG_INTERNAL) == 0) + MOD_INC_USE_COUNT; +#endif + +#ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED + be->config_move_done = ctl_config_move_done; +#endif + /* XXX KDM fix this! */ + be->num_luns = 0; +#if 0 + atomic_set(&be->num_luns, 0); +#endif + + mtx_unlock(&ctl_softc->ctl_lock); + + return (0); +} + +int +ctl_backend_deregister(struct ctl_backend_driver *be) +{ + struct ctl_softc *ctl_softc; + + ctl_softc = control_softc; + + mtx_lock(&ctl_softc->ctl_lock); + +#if 0 + if (atomic_read(&be->num_luns) != 0) { +#endif + /* XXX KDM fix this! */ + if (be->num_luns != 0) { + mtx_unlock(&ctl_softc->ctl_lock); + return (-1); + } + + STAILQ_REMOVE(&ctl_softc->be_list, be, ctl_backend_driver, links); + + ctl_softc->num_backends--; + + /* XXX KDM find a substitute for this? */ +#if 0 + if ((be->flags & CTL_BE_FLAG_INTERNAL) == 0) + MOD_DEC_USE_COUNT; +#endif + + mtx_unlock(&ctl_softc->ctl_lock); + + return (0); +} + +struct ctl_backend_driver * +ctl_backend_find(char *backend_name) +{ + struct ctl_softc *ctl_softc; + struct ctl_backend_driver *be_tmp; + + ctl_softc = control_softc; + + mtx_lock(&ctl_softc->ctl_lock); + + STAILQ_FOREACH(be_tmp, &ctl_softc->be_list, links) { + if (strcmp(be_tmp->name, backend_name) == 0) { + mtx_unlock(&ctl_softc->ctl_lock); + return (be_tmp); + } + } + + mtx_unlock(&ctl_softc->ctl_lock); + + return (NULL); +} + +/* + * vim: ts=8 + */ |
