/* * drivers/s390/cio/chsc.c * S/390 common I/O routines -- channel subsystem call * * Copyright IBM Corp. 1999,2010 * Author(s): Ingo Adlung (adlung@de.ibm.com) * Cornelia Huck (cornelia.huck@de.ibm.com) * Arnd Bergmann (arndb@de.ibm.com) */ #define KMSG_COMPONENT "cio" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include #include #include #include #include #include #include #include #include "css.h" #include "cio.h" #include "cio_debug.h" #include "ioasm.h" #include "chp.h" #include "chsc.h" static void *sei_page; static void *chsc_page; static DEFINE_SPINLOCK(chsc_page_lock); /** * chsc_error_from_response() - convert a chsc response to an error * @response: chsc response code * * Returns an appropriate Linux error code for @response. */ int chsc_error_from_response(int response) { switch (response) { case 0x0001: return 0; case 0x0002: case 0x0003: case 0x0006: case 0x0007: case 0x0008: case 0x000a: case 0x0104: return -EINVAL; case 0x0004: return -EOPNOTSUPP; default: return -EIO; } } EXPORT_SYMBOL_GPL(chsc_error_from_response); struct chsc_ssd_area { struct chsc_header request; u16 :10; u16 ssid:2; u16 :4; u16 f_sch; /* first subchannel */ u16 :16; u16 l_sch; /* last subchannel */ u32 :32; struct chsc_header response; u32 :32; u8 sch_valid : 1; u8 dev_valid : 1; u8 st : 3; /* subchannel type */ u8 zeroes : 3; u8 unit_addr; /* unit address */ u16 devno; /* device number */ u8 path_mask; u8 fla_valid_mask; u16 sch; /* subchannel */ u8 chpid[8]; /* chpids 0-7 */ u16 fla[8]; /* full link addresses 0-7 */ } __attribute__ ((packed)); int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd) { struct chsc_ssd_area *ssd_area; int ccode; int ret; int i; int mask; spin_lock_irq(&chsc_page_lock); memset(chsc_page, 0, PAGE_SIZE); ssd_area = chsc_page; ssd_area->request.length = 0x0010; ssd_area->request.code = 0x0004; ssd_area->ssid = schid.ssid; ssd_area->f_sch = schid.sch_no; ssd_area->l_sch = schid.sch_no; ccode = chsc(ssd_area); /* Check response. */ if (ccode > 0) { ret = (ccode == 3) ? -ENODEV : -EBUSY; goto out; } ret = chsc_error_from_response(ssd_area->response.code); if (ret != 0) { CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n", schid.ssid, schid.sch_no, ssd_area->response.code); goto out; } if (!ssd_area->sch_valid) { ret = -ENODEV; goto out; } /* Copy data */ ret = 0; memset(ssd, 0, sizeof(struct chsc_ssd_info)); if ((ssd_area->st != SUBCHANNEL_TYPE_IO) && (ssd_area->st != SUBCHANNEL_TYPE_MSG)) goto out; ssd->path_mask = ssd_area->path_mask; ssd->fla_valid_mask = ssd_area->fla_valid_mask; for (i = 0; i < 8; i++) { mask = 0x80 >> i; if (ssd_area->path_mask & mask) { chp_id_init(&ssd->chpid[i]); ssd->chpid[i].id = ssd_area->chpid[i]; } if (ssd_area->fla_valid_mask & mask) ssd->fla[i] = ssd_area->fla[i]; } out: spin_unlock_irq(&chsc_page_lock); return ret; } static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data) { spin_lock_irq(sch->lock); if (sch->driver && sch->driver->chp_event) if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0) goto out_unreg; spin_unlock_irq(sch->lock); return 0; out_unreg: sch->lpm = 0; spin_unlock_irq(sch->lock); css_schedule_eval(sch->schid); return 0; } void chsc_chp_offline(struct chp_id chpid) { char dbf_txt[15]; struct chp_link link; sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id); CIO_TRACE_EVENT(2, dbf_txt); if (chp_get_status(chpid) <= 0) return; memset(&link, 0, sizeof(struct chp_link)); link.chpid = chpid; /* Wait until previous actions have settled. */ css_wait_for_slow_path(); for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link); } static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data) { struct schib schib; /* * We don't know the device yet, but since a path * may be available now to the device we'll have * to do recognition again. * Since we don't have any idea about which chpid * that beast may be on we'll have to do a stsch * on all devices, grr... */ if (stsch_err(schid, &schib)) /* We're through */ return -ENXIO; /* Put it on the slow path. */ css_schedule_eval(schid); return 0; } static int __s390_process_res_acc(struct subchannel *sch, void *data) { spin_lock_irq(sch->lock); if (sch->driver && sch->driver->chp_event) sch->driver->chp_event(sch, data, CHP_ONLINE); spin_unlock_irq(sch->lock); return 0; } static void s390_process_res_acc(struct chp_link *link) { char dbf_txt[15]; sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid, link->chpid.id); CIO_TRACE_EVENT( 2, dbf_txt); if (link->fla != 0) { sprintf(dbf_txt, "fla%x", link->fla); CIO_TRACE_EVENT( 2, dbf_txt); } /* Wait until previous actions have settled. */ css_wait_for_slow_path(); /* * I/O resources may have become accessible. * Scan through all subchannels that may be concerned and * do a validation on those. * The more information we have (info), the less scanning * will we have to do. */ for_each_subchannel_staged(__s390_process_res_acc, s390_process_res_acc_new_sch, link); } static int __get_chpid_from_lir(void *data) { struct lir { u8 iq; u8 ic; u16 sci; /* incident-node descriptor */ u32 indesc[28]; /* attached-node descriptor */ u32 andesc[28]; /* incident-specific information */ u32 isinfo[28]; } __attribute__ ((packed)) *lir; lir = data; if (!(lir->iq&0x80)) /* NULL link incident record */ return -EINVAL; if (!(lir->indesc[0]&0xc0000000)) /* node descriptor not valid */ return -EINVAL; if (!(lir->indesc[0]&0x10000000)) /* don't handle device-type nodes - FIXME */ return -EINVAL; /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */ return (u16) (lir->indesc[0]&0x000000ff); } struct chsc_sei_area { struct chsc_header request; u32 reserved1; u32 reserved2; u32 reserved3; struct chsc_header response; u32 reserved4; u8 flags; u8 vf; /* validity flags */ u8 rs; /* reporting source */ u8 cc; /* content code */ u16 fla; /* full link address */ u16 rsid; /* reporting source id */ u32 reserved5; u32 reserved6; u8 ccdf[4096 - 16 - 24]; /* content-code dependent field */ /* ccdf has to be big enough for a link-incident record */ } __attribute__ ((packed)); static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area) { struct chp_id chpid; int id; CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n", sei_area->rs, sei_area->rsid); if (sei_area->rs != 4) return; id = __get_chpid_from_lir(sei_area->ccdf); if (id < 0) CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n"); else { chp_id_init(&chpid); chpid.id = id; chsc_chp_offline(chpid); } } static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area) { struct chp_link link; struct chp_id chpid; int status; CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, " "rs_id=%04x)\n", sei_area->rs, sei_area->rsid); if (sei_area->rs != 4) return; chp_id_init(&chpid); chpid.id = sei_area->rsid; /* allocate a new channel path structure, if needed */ status = chp_get_status(chpid); if (status < 0) chp_new(chpid); else if (!status) return; memset(&link, 0, sizeof(struct chp_link)); link.chpid = chpid; if ((sei_area->vf & 0xc0) != 0) { link.fla = sei_area->fla; if ((sei_area->vf & 0xc0) == 0xc0) /* full link address */ link.fla_mask = 0xffff; else /* link address */ link.fla_mask = 0xff00; } s390_process_res_acc(&link); } struct chp_config_data { u8 map[32]; u8 op; u8 pc; }; static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area) { struct chp_config_data *data; struct chp_id chpid; int num; char *events[3] = {"configure", "deconfigure", "cancel deconfigure"}; CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n"); if (sei_area->rs != 0) return; data = (struct chp_config_data *) &(sei_area->ccdf); chp_id_init(&chpid); for (num = 0; num <= __MAX_CHPID; num++) { if (!chp_test_bit(data->map, num)) continue; chpid.id = num; pr_notice("Processing %s for channel path %x.%02x\n", events[data->op], chpid.cssid, chpid.id); switch (data->op) { case 0: chp_cfg_schedule(chpid, 1); break; case 1: chp_cfg_schedule(chpid, 0); break; case 2: chp_cfg_cancel_deconfigure(chpid); break; } } } static void chsc_process_sei(struct chsc_sei_area *sei_area) { /* Check if we might have lost some information. */ if (sei_area->flags & 0x40) { CIO_CRW_EVENT(2, "chsc: event overflow\n"); css_schedule_eval_all(); } /* which kind of information was stored? */ switch (sei_area->cc) { case 1: /* link incident*/ chsc_process_sei_link_incident(sei_area); break; case 2: /* i/o resource accessibiliy */ chsc_process_sei_res_acc(sei_area); break; case 8: /* channel-path-configuration notification */ chsc_process_sei_chp_config(sei_area); break; default: /* other stuff */ CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n", sei_area->cc); break; } } static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow) { struct chsc_sei_area *sei_area; if (overflow) { css_schedule_eval_all(); return; } CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, crw0->erc, crw0->rsid); if (!sei_page) return; /* Access to sei_page is serialized through machine check handler * thread, so no need for locking. */ sei_area = sei_page; CIO_TRACE_EVENT(2, "prcss"); do { memset(sei_area, 0, sizeof(*sei_area)); sei_area->request.length = 0x0010; sei_area->request.code = 0x000e; if (chsc(sei_area)) break; if (sei_area->response.code == 0x0001) { CIO_CRW_EVENT(4, "chsc: sei successful\n"); chsc_process_sei(sei_area); } else { CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n", sei_area->response.code); break; } } while (sei_area->flags & 0x80); } void chsc_chp_online(struct chp_id chpid) { char dbf_txt[15]; struct chp_link link; sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id); CIO_TRACE_EVENT(2, dbf_txt); if (chp_get_status(chpid) != 0) { memset(&link, 0, sizeof(struct chp_link)); link.chpid = chpid; /* Wait until previous actions have settled. */ css_wait_for_slow_path(); for_each_subchannel_staged(__s390_process_res_acc, NULL, &link); } } static void __s390_subchannel_vary_chpid(struct subchannel *sch, struct chp_id chpid, int on) { unsigned long flags; struct chp_link link; memset(&link, 0, sizeof(struct chp_link)); link.chpid = chpid; spin_lock_irqsave(sch->lock, flags); if (sch->driver && sch->driver->chp_event) sch->driver->chp_event(sch, &link, on ? CHP_VARY_ON : CHP_VARY_OFF); spin_unlock_irqrestore(sch->lock, flags); } static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data) { struct chp_id *chpid = data; __s390_subchannel_vary_chpid(sch, *chpid, 0); return 0; } static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data) { struct chp_id *chpid = data; __s390_subchannel_vary_chpid(sch, *chpid, 1); return 0; } static int __s390_vary_chpid_on(struct subchannel_id schid, void *data) { struct schib schib; if (stsch_err(schid, &schib)) /* We're through */ return -ENXIO; /* Put it on the slow path. */ css_schedule_eval(schid); return 0; } /** * chsc_chp_vary - propagate channel-path vary operation to subchannels * @chpid: channl-path ID * @on: non-zero for vary online, zero for vary offline */ int chsc_chp_vary(struct chp_id chpid, int on) { struct channel_path *chp = chpid_to_chp(chpid); struct chp_link link; memset(&link, 0, sizeof(struct chp_link)); link.chpid = chpid; /* Wait until previous actions have settled. */ css_wait_for_slow_path(); /* * Redo PathVerification on the devices the chpid connects to */ if (on) { /* Try to update the channel path descritor. */ chsc_determine_base_channel_path_desc(chpid, &chp->desc); for_each_subchannel_staged(s390_subchannel_vary_chpid_on, __s390_vary_chpid_on, &link); } else for_each_subchannel_staged(s390_subchannel_vary_chpid_off, NULL, &link); return 0; } static void chsc_remove_cmg_attr(struct channel_subsystem *css) { int i; for (i = 0; i <= __MAX_CHPID; i++) { if (!css->chps[i]) continue; chp_remove_cmg_attr(css->chps[i]); } } static int chsc_add_cmg_attr(struct channel_subsystem *css) { int i, ret; ret = 0; for (i = 0; i <= __MAX_CHPID; i++) { if (!css->chps[i]) continue; ret = chp_add_cmg_attr(css->chps[i]); if (ret) goto cleanup; } return ret; cleanup: for (--i; i >= 0; i--) { if (!css->chps[i]) continue; chp_remove_cmg_attr(css->chps[i]); } return ret; } int __chsc_do_secm(struct channel_subsystem *css, int enable) { struct { struct chsc_header request; u32 operation_code : 2; u32 : 30; u32 key : 4; u32 : 28; u32 zeroes1; u32 cub_addr1; u32 zeroes2; u32 cub_addr2; u32 reserved[13]; struct chsc_header response; u32 status : 8; u32 : 4; u32 fmt : 4; u32 : 16; } __attribute__ ((packed)) *secm_area; int ret, ccode; spin_lock_irq(&chsc_page_lock); memset(chsc_page, 0, PAGE_SIZE); secm_area = chsc_page; secm_area->request.length = 0x0050; secm_area->request.code = 0x0016; secm_area->key = PAGE_DEFAULT_KEY >> 4; secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1; secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2; secm_area->operation_code = enable ? 0 : 1; ccode = chsc(secm_area); if (ccode > 0) { ret = (ccode == 3) ? -ENODEV : -EBUSY; goto out; } switch (secm_area->response.code) { case 0x0102: case 0x0103: ret = -EINVAL; break; default: ret = chsc_error_from_response(secm_area->response.code); } if (ret != 0) CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n", secm_area->response.code); out: spin_unlock_irq(&chsc_page_lock); return ret; } int chsc_secm(struct channel_subsystem *css, int enable) { int ret; if (enable && !css->cm_enabled) { css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); if (!css->cub_addr1 || !css->cub_addr2) { free_page((unsigned long)css->cub_addr1); free_page((unsigned long)css->cub_addr2); return -ENOMEM; } } ret = __chsc_do_secm(css, enable); if (!ret) { css->cm_enabled = enable; if (css->cm_enabled) { ret = chsc_add_cmg_attr(css); if (ret) { __chsc_do_secm(css, 0); css->cm_enabled = 0; } } else chsc_remove_cmg_attr(css); } if (!css->cm_enabled) { free_page((unsigned long)css->cub_addr1); free_page((unsigned long)css->cub_addr2); } return ret; } int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt, int c, int m, void *page) { struct chsc_scpd *scpd_area; int ccode, ret; if ((rfmt == 1) && !css_general_characteristics.fcs) return -EINVAL; if ((rfmt == 2) && !css_general_characteristics.cib) return -EINVAL; memset(page, 0, PAGE_SIZE); scpd_area = page; scpd_area->request.length = 0x0010; scpd_area->request.code = 0x0002; scpd_area->cssid = chpid.cssid; scpd_area->first_chpid = chpid.id; scpd_area->last_chpid = chpid.id; scpd_area->m = m; scpd_area->c = c; scpd_area->fmt = fmt; scpd_area->rfmt = rfmt; ccode = chsc(scpd_area); if (ccode > 0) return (ccode == 3) ? -ENODEV : -EBUSY; ret = chsc_error_from_response(scpd_area->response.code); if (ret) CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n", scpd_area->response.code); return ret; } EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc); int chsc_determine_base_channel_path_desc(struct chp_id chpid, struct channel_path_desc *desc) { struct chsc_response_struct *chsc_resp; struct chsc_scpd *scpd_area; int ret; spin_lock_irq(&chsc_page_lock); scpd_area = chsc_page; ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area); if (ret) goto out; chsc_resp = (void *)&scpd_area->response; memcpy(desc, &chsc_resp->data, sizeof(*desc)); out: spin_unlock_irq(&chsc_page_lock); return ret; } static void chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv, struct cmg_chars *chars) { struct cmg_chars *cmg_chars; int i, mask; cmg_chars = chp->cmg_chars; for (i = 0; i < NR_MEASUREMENT_CHARS; i++) { mask = 0x80 >> (i + 3); if (cmcv & mask) cmg_chars->values[i] = chars->values[i]; else cmg_chars->values[i] = 0; } } int chsc_get_channel_measurement_chars(struct channel_path *chp) { struct cmg_chars *cmg_chars; int ccode, ret; struct { struct chsc_header request; u32 : 24; u32 first_chpid : 8; u32 : 24; u32 last_chpid : 8; u32 zeroes1; struct chsc_header response; u32 zeroes2; u32 not_valid : 1; u32 shared : 1; u32 : 22; u32 chpid : 8; u32 cmcv : 5; u32 : 11; u32 cmgq : 8; u32 cmg : 8; u32 zeroes3; u32 data[NR_MEASUREMENT_CHARS]; } __attribute__ ((packed)) *scmc_area; chp->cmg_chars = NULL; cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL); if (!cmg_chars) return -ENOMEM; spin_lock_irq(&chsc_page_lock); memset(chsc_page, 0, PAGE_SIZE); scmc_area = chsc_page; scmc_area->request.length = 0x0010; scmc_area->request.code = 0x0022; scmc_area->first_chpid = chp->chpid.id; scmc_area->last_chpid = chp->chpid.id; ccode = chsc(scmc_area); if (ccode > 0) { ret = (ccode == 3) ? -ENODEV : -EBUSY; goto out; } ret = chsc_error_from_response(scmc_area->response.code); if (ret) { CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n", scmc_area->response.code); goto out; } if (scmc_area->not_valid) { chp->cmg = -1; chp->shared = -1; goto out; } chp->cmg = scmc_area->cmg; chp->shared = scmc_area->shared; if (chp->cmg != 2 && chp->cmg != 3) { /* No cmg-dependent data. */ goto out; } chp->cmg_chars = cmg_chars; chsc_initialize_cmg_chars(chp, scmc_area->cmcv, (struct cmg_chars *) &scmc_area->data); out: spin_unlock_irq(&chsc_page_lock); if (!chp->cmg_chars) kfree(cmg_chars); return ret; } int __init chsc_init(void) { int ret; sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); if (!sei_page || !chsc_page) { ret = -ENOMEM; goto out_err; } ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw); if (ret) goto out_err; return ret; out_err: free_page((unsigned long)chsc_page); free_page((unsigned long)sei_page); return ret; } void __init chsc_init_cleanup(void) { crw_unregister_handler(CRW_RSC_CSS); free_page((unsigned long)chsc_page); free_page((unsigned long)sei_page); } int chsc_enable_facility(int operation_code) { unsigned long flags; int ret; struct { struct chsc_header request; u8 reserved1:4; u8 format:4; u8 reserved2; u16 operation_code; u32 reserved3; u32 reserved4; u32 operation_data_area[252]; struct chsc_header response; u32 reserved5:4; u32 format2:4; u32 reserved6:24; } __attribute__ ((packed)) *sda_area; spin_lock_irqsave(&chsc_page_lock, flags); memset(chsc_page, 0, PAGE_SIZE); sda_area = chsc_page; sda_area->request.length = 0x0400; sda_area->request.code = 0x0031; sda_area->operation_code = operation_code; ret = chsc(sda_area); if (ret > 0) { ret = (ret == 3) ? -ENODEV : -EBUSY; goto out; } switch (sda_area->response.code) { case 0x0101: ret = -EOPNOTSUPP; break; default: ret = chsc_error_from_response(sda_area->response.code); } if (ret != 0) CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n", operation_code, sda_area->response.code); out: spin_unlock_irqrestore(&chsc_page_lock, flags); return ret; } struct css_general_char css_general_characteristics; struct css_chsc_char css_chsc_characteristics; int __init chsc_determine_css_characteristics(void) { int result; struct { struct chsc_header request; u32 reserved1; u32 reserved2; u32 reserved3; struct chsc_header response; u32 reserved4; u32 general_char[510]; u32 chsc_char[508]; } __attribute__ ((packed)) *scsc_area; spin_lock_irq(&chsc_page_lock); memset(chsc_page, 0, PAGE_SIZE); scsc_area = chsc_page; scsc_area->request.length = 0x0010; scsc_area->request.code = 0x0010; result = chsc(scsc_area); if (result) { result = (result == 3) ? -ENODEV : -EBUSY; goto exit; } result = chsc_error_from_response(scsc_area->response.code); if (result == 0) { memcpy(&css_general_characteristics, scsc_area->general_char, sizeof(css_general_characteristics)); memcpy(&css_chsc_characteristics, scsc_area->chsc_char, sizeof(css_chsc_characteristics)); } else CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n", scsc_area->response.code); exit: spin_unlock_irq(&chsc_page_lock); return result; } EXPORT_SYMBOL_GPL(css_general_characteristics); EXPORT_SYMBOL_GPL(css_chsc_characteristics); int chsc_sstpc(void *page, unsigned int op, u16 ctrl) { struct { struct chsc_header request; unsigned int rsvd0; unsigned int op : 8; unsigned int rsvd1 : 8; unsigned int ctrl : 16; unsigned int rsvd2[5]; struct chsc_header response; unsigned int rsvd3[7]; } __attribute__ ((packed)) *rr; int rc; memset(page, 0, PAGE_SIZE); rr = page; rr->request.length = 0x0020; rr->request.code = 0x0033; rr->op = op; rr->ctrl = ctrl; rc = chsc(rr); if (rc) return -EIO; rc = (rr->response.code == 0x0001) ? 0 : -EIO; return rc; } int chsc_sstpi(void *page, void *result, size_t size) { struct { struct chsc_header request; unsigned int rsvd0[3]; struct chsc_header response; char data[size]; } __attribute__ ((packed)) *rr; int rc; memset(page, 0, PAGE_SIZE); rr = page; rr->request.length = 0x0010; rr->request.code = 0x0038; rc = chsc(rr); if (rc) return -EIO; memcpy(result, &rr->data, size); return (rr->response.code == 0x0001) ? 0 : -EIO; } int chsc_siosl(struct subchannel_id schid) { struct { struct chsc_header request; u32 word1; struct subchannel_id sid; u32 word3; struct chsc_header response; u32 word[11]; } __attribute__ ((packed)) *siosl_area; unsigned long flags; int ccode; int rc; spin_lock_irqsave(&chsc_page_lock, flags); memset(chsc_page, 0, PAGE_SIZE); siosl_area = chsc_page; siosl_area->request.length = 0x0010; siosl_area->request.code = 0x0046; siosl_area->word1 = 0x80000000; siosl_area->sid = schid; ccode = chsc(siosl_area); if (ccode > 0) { if (ccode == 3) rc = -ENODEV; else rc = -EBUSY; CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n", schid.ssid, schid.sch_no, ccode); goto out; } rc = chsc_error_from_response(siosl_area->response.code); if (rc) CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n", schid.ssid, schid.sch_no, siosl_area->response.code); else CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n", schid.ssid, schid.sch_no); out: spin_unlock_irqrestore(&chsc_page_lock, flags); return rc; } EXPORT_SYMBOL_GPL(chsc_siosl);