zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/s390/cio/chsc.c b/ap/os/linux/linux-3.4.x/drivers/s390/cio/chsc.c
new file mode 100644
index 0000000..a84631a
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/s390/cio/chsc.c
@@ -0,0 +1,1050 @@
+/*
+ * 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 <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/device.h>
+
+#include <asm/cio.h>
+#include <asm/chpid.h>
+#include <asm/chsc.h>
+#include <asm/crw.h>
+
+#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);
+}
+
+static void chsc_process_sei_chp_avail(struct chsc_sei_area *sei_area)
+{
+ struct channel_path *chp;
+ struct chp_id chpid;
+ u8 *data;
+ int num;
+
+ CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
+ if (sei_area->rs != 0)
+ return;
+ data = sei_area->ccdf;
+ chp_id_init(&chpid);
+ for (num = 0; num <= __MAX_CHPID; num++) {
+ if (!chp_test_bit(data, num))
+ continue;
+ chpid.id = num;
+
+ CIO_CRW_EVENT(4, "Update information for channel path "
+ "%x.%02x\n", chpid.cssid, chpid.id);
+ chp = chpid_to_chp(chpid);
+ if (!chp) {
+ chp_new(chpid);
+ continue;
+ }
+ mutex_lock(&chp->lock);
+ chsc_determine_base_channel_path_desc(chpid, &chp->desc);
+ mutex_unlock(&chp->lock);
+ }
+}
+
+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 accessibility */
+ chsc_process_sei_res_acc(sei_area);
+ break;
+ case 7: /* channel-path-availability information */
+ chsc_process_sei_chp_avail(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);
+
+ /* 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, &chpid);
+ } else
+ for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
+ NULL, &chpid);
+
+ 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;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&chsc_page_lock, flags);
+ 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_irqrestore(&chsc_page_lock, flags);
+ return ret;
+}
+
+int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
+ struct channel_path_desc_fmt1 *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, 1, 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);