Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
new file mode 100644
index 0000000..b35fe12
--- /dev/null
+++ b/drivers/s390/cio/chsc.c
@@ -0,0 +1,1114 @@
+/*
+ * drivers/s390/cio/chsc.c
+ * S/390 common I/O routines -- channel subsystem call
+ * $Revision: 1.119 $
+ *
+ * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
+ * IBM Corporation
+ * Author(s): Ingo Adlung (adlung@de.ibm.com)
+ * Cornelia Huck (cohuck@de.ibm.com)
+ * Arnd Bergmann (arndb@de.ibm.com)
+ */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/device.h>
+
+#include <asm/cio.h>
+
+#include "css.h"
+#include "cio.h"
+#include "cio_debug.h"
+#include "ioasm.h"
+#include "chsc.h"
+
+static struct channel_path *chps[NR_CHPIDS];
+
+static void *sei_page;
+
+static int new_channel_path(int chpid);
+
+static inline void
+set_chp_logically_online(int chp, int onoff)
+{
+ chps[chp]->state = onoff;
+}
+
+static int
+get_chp_status(int chp)
+{
+ return (chps[chp] ? chps[chp]->state : -ENODEV);
+}
+
+void
+chsc_validate_chpids(struct subchannel *sch)
+{
+ int mask, chp;
+
+ for (chp = 0; chp <= 7; chp++) {
+ mask = 0x80 >> chp;
+ if (!get_chp_status(sch->schib.pmcw.chpid[chp]))
+ /* disable using this path */
+ sch->opm &= ~mask;
+ }
+}
+
+void
+chpid_is_actually_online(int chp)
+{
+ int state;
+
+ state = get_chp_status(chp);
+ if (state < 0) {
+ need_rescan = 1;
+ queue_work(slow_path_wq, &slow_path_work);
+ } else
+ WARN_ON(!state);
+}
+
+/* FIXME: this is _always_ called for every subchannel. shouldn't we
+ * process more than one at a time? */
+static int
+chsc_get_sch_desc_irq(struct subchannel *sch, void *page)
+{
+ int ccode, j;
+
+ struct {
+ struct chsc_header request;
+ u16 reserved1;
+ u16 f_sch; /* first subchannel */
+ u16 reserved2;
+ u16 l_sch; /* last subchannel */
+ u32 reserved3;
+ struct chsc_header response;
+ u32 reserved4;
+ 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 */
+ } *ssd_area;
+
+ ssd_area = page;
+
+ ssd_area->request = (struct chsc_header) {
+ .length = 0x0010,
+ .code = 0x0004,
+ };
+
+ ssd_area->f_sch = sch->irq;
+ ssd_area->l_sch = sch->irq;
+
+ ccode = chsc(ssd_area);
+ if (ccode > 0) {
+ pr_debug("chsc returned with ccode = %d\n", ccode);
+ return (ccode == 3) ? -ENODEV : -EBUSY;
+ }
+
+ switch (ssd_area->response.code) {
+ case 0x0001: /* everything ok */
+ break;
+ case 0x0002:
+ CIO_CRW_EVENT(2, "Invalid command!\n");
+ return -EINVAL;
+ case 0x0003:
+ CIO_CRW_EVENT(2, "Error in chsc request block!\n");
+ return -EINVAL;
+ case 0x0004:
+ CIO_CRW_EVENT(2, "Model does not provide ssd\n");
+ return -EOPNOTSUPP;
+ default:
+ CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
+ ssd_area->response.code);
+ return -EIO;
+ }
+
+ /*
+ * ssd_area->st stores the type of the detected
+ * subchannel, with the following definitions:
+ *
+ * 0: I/O subchannel: All fields have meaning
+ * 1: CHSC subchannel: Only sch_val, st and sch
+ * have meaning
+ * 2: Message subchannel: All fields except unit_addr
+ * have meaning
+ * 3: ADM subchannel: Only sch_val, st and sch
+ * have meaning
+ *
+ * Other types are currently undefined.
+ */
+ if (ssd_area->st > 3) { /* uhm, that looks strange... */
+ CIO_CRW_EVENT(0, "Strange subchannel type %d"
+ " for sch %04x\n", ssd_area->st, sch->irq);
+ /*
+ * There may have been a new subchannel type defined in the
+ * time since this code was written; since we don't know which
+ * fields have meaning and what to do with it we just jump out
+ */
+ return 0;
+ } else {
+ const char *type[4] = {"I/O", "chsc", "message", "ADM"};
+ CIO_CRW_EVENT(6, "ssd: sch %04x is %s subchannel\n",
+ sch->irq, type[ssd_area->st]);
+
+ sch->ssd_info.valid = 1;
+ sch->ssd_info.type = ssd_area->st;
+ }
+
+ if (ssd_area->st == 0 || ssd_area->st == 2) {
+ for (j = 0; j < 8; j++) {
+ if (!((0x80 >> j) & ssd_area->path_mask &
+ ssd_area->fla_valid_mask))
+ continue;
+ sch->ssd_info.chpid[j] = ssd_area->chpid[j];
+ sch->ssd_info.fla[j] = ssd_area->fla[j];
+ }
+ }
+ return 0;
+}
+
+int
+css_get_ssd_info(struct subchannel *sch)
+{
+ int ret;
+ void *page;
+
+ page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+ if (!page)
+ return -ENOMEM;
+ spin_lock_irq(&sch->lock);
+ ret = chsc_get_sch_desc_irq(sch, page);
+ if (ret) {
+ static int cio_chsc_err_msg;
+
+ if (!cio_chsc_err_msg) {
+ printk(KERN_ERR
+ "chsc_get_sch_descriptions:"
+ " Error %d while doing chsc; "
+ "processing some machine checks may "
+ "not work\n", ret);
+ cio_chsc_err_msg = 1;
+ }
+ }
+ spin_unlock_irq(&sch->lock);
+ free_page((unsigned long)page);
+ if (!ret) {
+ int j, chpid;
+ /* Allocate channel path structures, if needed. */
+ for (j = 0; j < 8; j++) {
+ chpid = sch->ssd_info.chpid[j];
+ if (chpid && (get_chp_status(chpid) < 0))
+ new_channel_path(chpid);
+ }
+ }
+ return ret;
+}
+
+static int
+s390_subchannel_remove_chpid(struct device *dev, void *data)
+{
+ int j;
+ int mask;
+ struct subchannel *sch;
+ __u8 *chpid;
+ struct schib schib;
+
+ sch = to_subchannel(dev);
+ chpid = data;
+ for (j = 0; j < 8; j++)
+ if (sch->schib.pmcw.chpid[j] == *chpid)
+ break;
+ if (j >= 8)
+ return 0;
+
+ mask = 0x80 >> j;
+ spin_lock(&sch->lock);
+
+ stsch(sch->irq, &schib);
+ if (!schib.pmcw.dnv)
+ goto out_unreg;
+ memcpy(&sch->schib, &schib, sizeof(struct schib));
+ /* Check for single path devices. */
+ if (sch->schib.pmcw.pim == 0x80)
+ goto out_unreg;
+ if (sch->vpm == mask)
+ goto out_unreg;
+
+ if ((sch->schib.scsw.actl & (SCSW_ACTL_CLEAR_PEND |
+ SCSW_ACTL_HALT_PEND |
+ SCSW_ACTL_START_PEND |
+ SCSW_ACTL_RESUME_PEND)) &&
+ (sch->schib.pmcw.lpum == mask)) {
+ int cc = cio_cancel(sch);
+
+ if (cc == -ENODEV)
+ goto out_unreg;
+
+ if (cc == -EINVAL) {
+ cc = cio_clear(sch);
+ if (cc == -ENODEV)
+ goto out_unreg;
+ /* Call handler. */
+ if (sch->driver && sch->driver->termination)
+ sch->driver->termination(&sch->dev);
+ goto out_unlock;
+ }
+ } else if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) &&
+ (sch->schib.scsw.actl & SCSW_ACTL_SCHACT) &&
+ (sch->schib.pmcw.lpum == mask)) {
+ int cc;
+
+ cc = cio_clear(sch);
+ if (cc == -ENODEV)
+ goto out_unreg;
+ /* Call handler. */
+ if (sch->driver && sch->driver->termination)
+ sch->driver->termination(&sch->dev);
+ goto out_unlock;
+ }
+
+ /* trigger path verification. */
+ if (sch->driver && sch->driver->verify)
+ sch->driver->verify(&sch->dev);
+out_unlock:
+ spin_unlock(&sch->lock);
+ return 0;
+out_unreg:
+ spin_unlock(&sch->lock);
+ sch->lpm = 0;
+ if (css_enqueue_subchannel_slow(sch->irq)) {
+ css_clear_subchannel_slow_list();
+ need_rescan = 1;
+ }
+ return 0;
+}
+
+static inline void
+s390_set_chpid_offline( __u8 chpid)
+{
+ char dbf_txt[15];
+
+ sprintf(dbf_txt, "chpr%x", chpid);
+ CIO_TRACE_EVENT(2, dbf_txt);
+
+ if (get_chp_status(chpid) <= 0)
+ return;
+
+ bus_for_each_dev(&css_bus_type, NULL, &chpid,
+ s390_subchannel_remove_chpid);
+
+ if (need_rescan || css_slow_subchannels_exist())
+ queue_work(slow_path_wq, &slow_path_work);
+}
+
+static int
+s390_process_res_acc_sch(u8 chpid, __u16 fla, u32 fla_mask,
+ struct subchannel *sch)
+{
+ int found;
+ int chp;
+ int ccode;
+
+ found = 0;
+ for (chp = 0; chp <= 7; chp++)
+ /*
+ * check if chpid is in information updated by ssd
+ */
+ if (sch->ssd_info.valid &&
+ sch->ssd_info.chpid[chp] == chpid &&
+ (sch->ssd_info.fla[chp] & fla_mask) == fla) {
+ found = 1;
+ break;
+ }
+
+ if (found == 0)
+ return 0;
+
+ /*
+ * Do a stsch to update our subchannel structure with the
+ * new path information and eventually check for logically
+ * offline chpids.
+ */
+ ccode = stsch(sch->irq, &sch->schib);
+ if (ccode > 0)
+ return 0;
+
+ return 0x80 >> chp;
+}
+
+static int
+s390_process_res_acc (u8 chpid, __u16 fla, u32 fla_mask)
+{
+ struct subchannel *sch;
+ int irq, rc;
+ char dbf_txt[15];
+
+ sprintf(dbf_txt, "accpr%x", chpid);
+ CIO_TRACE_EVENT( 2, dbf_txt);
+ if (fla != 0) {
+ sprintf(dbf_txt, "fla%x", fla);
+ CIO_TRACE_EVENT( 2, dbf_txt);
+ }
+
+ /*
+ * 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.
+ */
+
+ if (!get_chp_status(chpid))
+ return 0; /* no need to do the rest */
+
+ rc = 0;
+ for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
+ int chp_mask, old_lpm;
+
+ sch = get_subchannel_by_schid(irq);
+ if (!sch) {
+ struct schib schib;
+ int ret;
+ /*
+ * 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(irq, &schib)) {
+ /* We're through */
+ if (need_rescan)
+ rc = -EAGAIN;
+ break;
+ }
+ if (need_rescan) {
+ rc = -EAGAIN;
+ continue;
+ }
+ /* Put it on the slow path. */
+ ret = css_enqueue_subchannel_slow(irq);
+ if (ret) {
+ css_clear_subchannel_slow_list();
+ need_rescan = 1;
+ }
+ rc = -EAGAIN;
+ continue;
+ }
+
+ spin_lock_irq(&sch->lock);
+
+ chp_mask = s390_process_res_acc_sch(chpid, fla, fla_mask, sch);
+
+ if (chp_mask == 0) {
+
+ spin_unlock_irq(&sch->lock);
+
+ if (fla_mask != 0)
+ break;
+ else
+ continue;
+ }
+ old_lpm = sch->lpm;
+ sch->lpm = ((sch->schib.pmcw.pim &
+ sch->schib.pmcw.pam &
+ sch->schib.pmcw.pom)
+ | chp_mask) & sch->opm;
+ if (!old_lpm && sch->lpm)
+ device_trigger_reprobe(sch);
+ else if (sch->driver && sch->driver->verify)
+ sch->driver->verify(&sch->dev);
+
+ spin_unlock_irq(&sch->lock);
+ put_device(&sch->dev);
+ if (fla_mask != 0)
+ break;
+ }
+ return rc;
+}
+
+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];
+ } *lir;
+
+ lir = (struct 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);
+}
+
+int
+chsc_process_crw(void)
+{
+ int chpid, ret;
+ struct {
+ 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;
+ u32 ccdf[96]; /* content-code dependent field */
+ /* ccdf has to be big enough for a link-incident record */
+ } *sei_area;
+
+ if (!sei_page)
+ return 0;
+ /*
+ * build the chsc request block for store event information
+ * and do the call
+ * This function is only called by the machine check handler thread,
+ * so we don't need locking for the sei_page.
+ */
+ sei_area = sei_page;
+
+ CIO_TRACE_EVENT( 2, "prcss");
+ ret = 0;
+ do {
+ int ccode, status;
+ memset(sei_area, 0, sizeof(*sei_area));
+
+ sei_area->request = (struct chsc_header) {
+ .length = 0x0010,
+ .code = 0x000e,
+ };
+
+ ccode = chsc(sei_area);
+ if (ccode > 0)
+ return 0;
+
+ switch (sei_area->response.code) {
+ /* for debug purposes, check for problems */
+ case 0x0001:
+ CIO_CRW_EVENT(4, "chsc_process_crw: event information "
+ "successfully stored\n");
+ break; /* everything ok */
+ case 0x0002:
+ CIO_CRW_EVENT(2,
+ "chsc_process_crw: invalid command!\n");
+ return 0;
+ case 0x0003:
+ CIO_CRW_EVENT(2, "chsc_process_crw: error in chsc "
+ "request block!\n");
+ return 0;
+ case 0x0005:
+ CIO_CRW_EVENT(2, "chsc_process_crw: no event "
+ "information stored\n");
+ return 0;
+ default:
+ CIO_CRW_EVENT(2, "chsc_process_crw: chsc response %d\n",
+ sei_area->response.code);
+ return 0;
+ }
+
+ /* Check if we might have lost some information. */
+ if (sei_area->flags & 0x40)
+ CIO_CRW_EVENT(2, "chsc_process_crw: Event information "
+ "has been lost due to overflow!\n");
+
+ if (sei_area->rs != 4) {
+ CIO_CRW_EVENT(2, "chsc_process_crw: reporting source "
+ "(%04X) isn't a chpid!\n",
+ sei_area->rsid);
+ continue;
+ }
+
+ /* which kind of information was stored? */
+ switch (sei_area->cc) {
+ case 1: /* link incident*/
+ CIO_CRW_EVENT(4, "chsc_process_crw: "
+ "channel subsystem reports link incident,"
+ " reporting source is chpid %x\n",
+ sei_area->rsid);
+ chpid = __get_chpid_from_lir(sei_area->ccdf);
+ if (chpid < 0)
+ CIO_CRW_EVENT(4, "%s: Invalid LIR, skipping\n",
+ __FUNCTION__);
+ else
+ s390_set_chpid_offline(chpid);
+ break;
+
+ case 2: /* i/o resource accessibiliy */
+ CIO_CRW_EVENT(4, "chsc_process_crw: "
+ "channel subsystem reports some I/O "
+ "devices may have become accessible\n");
+ pr_debug("Data received after sei: \n");
+ pr_debug("Validity flags: %x\n", sei_area->vf);
+
+ /* allocate a new channel path structure, if needed */
+ status = get_chp_status(sei_area->rsid);
+ if (status < 0)
+ new_channel_path(sei_area->rsid);
+ else if (!status)
+ return 0;
+ if ((sei_area->vf & 0x80) == 0) {
+ pr_debug("chpid: %x\n", sei_area->rsid);
+ ret = s390_process_res_acc(sei_area->rsid,
+ 0, 0);
+ } else if ((sei_area->vf & 0xc0) == 0x80) {
+ pr_debug("chpid: %x link addr: %x\n",
+ sei_area->rsid, sei_area->fla);
+ ret = s390_process_res_acc(sei_area->rsid,
+ sei_area->fla,
+ 0xff00);
+ } else if ((sei_area->vf & 0xc0) == 0xc0) {
+ pr_debug("chpid: %x full link addr: %x\n",
+ sei_area->rsid, sei_area->fla);
+ ret = s390_process_res_acc(sei_area->rsid,
+ sei_area->fla,
+ 0xffff);
+ }
+ pr_debug("\n");
+
+ break;
+
+ default: /* other stuff */
+ CIO_CRW_EVENT(4, "chsc_process_crw: event %d\n",
+ sei_area->cc);
+ break;
+ }
+ } while (sei_area->flags & 0x80);
+ return ret;
+}
+
+static int
+chp_add(int chpid)
+{
+ struct subchannel *sch;
+ int irq, ret, rc;
+ char dbf_txt[15];
+
+ if (!get_chp_status(chpid))
+ return 0; /* no need to do the rest */
+
+ sprintf(dbf_txt, "cadd%x", chpid);
+ CIO_TRACE_EVENT(2, dbf_txt);
+
+ rc = 0;
+ for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
+ int i;
+
+ sch = get_subchannel_by_schid(irq);
+ if (!sch) {
+ struct schib schib;
+
+ if (stsch(irq, &schib)) {
+ /* We're through */
+ if (need_rescan)
+ rc = -EAGAIN;
+ break;
+ }
+ if (need_rescan) {
+ rc = -EAGAIN;
+ continue;
+ }
+ /* Put it on the slow path. */
+ ret = css_enqueue_subchannel_slow(irq);
+ if (ret) {
+ css_clear_subchannel_slow_list();
+ need_rescan = 1;
+ }
+ rc = -EAGAIN;
+ continue;
+ }
+
+ spin_lock(&sch->lock);
+ for (i=0; i<8; i++)
+ if (sch->schib.pmcw.chpid[i] == chpid) {
+ if (stsch(sch->irq, &sch->schib) != 0) {
+ /* Endgame. */
+ spin_unlock(&sch->lock);
+ return rc;
+ }
+ break;
+ }
+ if (i==8) {
+ spin_unlock(&sch->lock);
+ return rc;
+ }
+ sch->lpm = ((sch->schib.pmcw.pim &
+ sch->schib.pmcw.pam &
+ sch->schib.pmcw.pom)
+ | 0x80 >> i) & sch->opm;
+
+ if (sch->driver && sch->driver->verify)
+ sch->driver->verify(&sch->dev);
+
+ spin_unlock(&sch->lock);
+ put_device(&sch->dev);
+ }
+ return rc;
+}
+
+/*
+ * Handling of crw machine checks with channel path source.
+ */
+int
+chp_process_crw(int chpid, int on)
+{
+ if (on == 0) {
+ /* Path has gone. We use the link incident routine.*/
+ s390_set_chpid_offline(chpid);
+ return 0; /* De-register is async anyway. */
+ }
+ /*
+ * Path has come. Allocate a new channel path structure,
+ * if needed.
+ */
+ if (get_chp_status(chpid) < 0)
+ new_channel_path(chpid);
+ /* Avoid the extra overhead in process_rec_acc. */
+ return chp_add(chpid);
+}
+
+static inline int
+__check_for_io_and_kill(struct subchannel *sch, int index)
+{
+ int cc;
+
+ if (!device_is_online(sch))
+ /* cio could be doing I/O. */
+ return 0;
+ cc = stsch(sch->irq, &sch->schib);
+ if (cc)
+ return 0;
+ if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == (0x80 >> index)) {
+ device_set_waiting(sch);
+ return 1;
+ }
+ return 0;
+}
+
+static inline void
+__s390_subchannel_vary_chpid(struct subchannel *sch, __u8 chpid, int on)
+{
+ int chp, old_lpm;
+ unsigned long flags;
+
+ if (!sch->ssd_info.valid)
+ return;
+
+ spin_lock_irqsave(&sch->lock, flags);
+ old_lpm = sch->lpm;
+ for (chp = 0; chp < 8; chp++) {
+ if (sch->ssd_info.chpid[chp] != chpid)
+ continue;
+
+ if (on) {
+ sch->opm |= (0x80 >> chp);
+ sch->lpm |= (0x80 >> chp);
+ if (!old_lpm)
+ device_trigger_reprobe(sch);
+ else if (sch->driver && sch->driver->verify)
+ sch->driver->verify(&sch->dev);
+ } else {
+ sch->opm &= ~(0x80 >> chp);
+ sch->lpm &= ~(0x80 >> chp);
+ /*
+ * Give running I/O a grace period in which it
+ * can successfully terminate, even using the
+ * just varied off path. Then kill it.
+ */
+ if (!__check_for_io_and_kill(sch, chp) && !sch->lpm) {
+ if (css_enqueue_subchannel_slow(sch->irq)) {
+ css_clear_subchannel_slow_list();
+ need_rescan = 1;
+ }
+ } else if (sch->driver && sch->driver->verify)
+ sch->driver->verify(&sch->dev);
+ }
+ break;
+ }
+ spin_unlock_irqrestore(&sch->lock, flags);
+}
+
+static int
+s390_subchannel_vary_chpid_off(struct device *dev, void *data)
+{
+ struct subchannel *sch;
+ __u8 *chpid;
+
+ sch = to_subchannel(dev);
+ chpid = data;
+
+ __s390_subchannel_vary_chpid(sch, *chpid, 0);
+ return 0;
+}
+
+static int
+s390_subchannel_vary_chpid_on(struct device *dev, void *data)
+{
+ struct subchannel *sch;
+ __u8 *chpid;
+
+ sch = to_subchannel(dev);
+ chpid = data;
+
+ __s390_subchannel_vary_chpid(sch, *chpid, 1);
+ return 0;
+}
+
+/*
+ * Function: s390_vary_chpid
+ * Varies the specified chpid online or offline
+ */
+static int
+s390_vary_chpid( __u8 chpid, int on)
+{
+ char dbf_text[15];
+ int status, irq, ret;
+ struct subchannel *sch;
+
+ sprintf(dbf_text, on?"varyon%x":"varyoff%x", chpid);
+ CIO_TRACE_EVENT( 2, dbf_text);
+
+ status = get_chp_status(chpid);
+ if (status < 0) {
+ printk(KERN_ERR "Can't vary unknown chpid %02X\n", chpid);
+ return -EINVAL;
+ }
+
+ if (!on && !status) {
+ printk(KERN_ERR "chpid %x is already offline\n", chpid);
+ return -EINVAL;
+ }
+
+ set_chp_logically_online(chpid, on);
+
+ /*
+ * Redo PathVerification on the devices the chpid connects to
+ */
+
+ bus_for_each_dev(&css_bus_type, NULL, &chpid, on ?
+ s390_subchannel_vary_chpid_on :
+ s390_subchannel_vary_chpid_off);
+ if (!on)
+ goto out;
+ /* Scan for new devices on varied on path. */
+ for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
+ struct schib schib;
+
+ if (need_rescan)
+ break;
+ sch = get_subchannel_by_schid(irq);
+ if (sch) {
+ put_device(&sch->dev);
+ continue;
+ }
+ if (stsch(irq, &schib))
+ /* We're through */
+ break;
+ /* Put it on the slow path. */
+ ret = css_enqueue_subchannel_slow(irq);
+ if (ret) {
+ css_clear_subchannel_slow_list();
+ need_rescan = 1;
+ }
+ }
+out:
+ if (need_rescan || css_slow_subchannels_exist())
+ queue_work(slow_path_wq, &slow_path_work);
+ return 0;
+}
+
+/*
+ * Files for the channel path entries.
+ */
+static ssize_t
+chp_status_show(struct device *dev, char *buf)
+{
+ struct channel_path *chp = container_of(dev, struct channel_path, dev);
+
+ if (!chp)
+ return 0;
+ return (get_chp_status(chp->id) ? sprintf(buf, "online\n") :
+ sprintf(buf, "offline\n"));
+}
+
+static ssize_t
+chp_status_write(struct device *dev, const char *buf, size_t count)
+{
+ struct channel_path *cp = container_of(dev, struct channel_path, dev);
+ char cmd[10];
+ int num_args;
+ int error;
+
+ num_args = sscanf(buf, "%5s", cmd);
+ if (!num_args)
+ return count;
+
+ if (!strnicmp(cmd, "on", 2))
+ error = s390_vary_chpid(cp->id, 1);
+ else if (!strnicmp(cmd, "off", 3))
+ error = s390_vary_chpid(cp->id, 0);
+ else
+ error = -EINVAL;
+
+ return error < 0 ? error : count;
+
+}
+
+static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);
+
+static ssize_t
+chp_type_show(struct device *dev, char *buf)
+{
+ struct channel_path *chp = container_of(dev, struct channel_path, dev);
+
+ if (!chp)
+ return 0;
+ return sprintf(buf, "%x\n", chp->desc.desc);
+}
+
+static DEVICE_ATTR(type, 0444, chp_type_show, NULL);
+
+static struct attribute * chp_attrs[] = {
+ &dev_attr_status.attr,
+ &dev_attr_type.attr,
+ NULL,
+};
+
+static struct attribute_group chp_attr_group = {
+ .attrs = chp_attrs,
+};
+
+static void
+chp_release(struct device *dev)
+{
+ struct channel_path *cp;
+
+ cp = container_of(dev, struct channel_path, dev);
+ kfree(cp);
+}
+
+static int
+chsc_determine_channel_path_description(int chpid,
+ struct channel_path_desc *desc)
+{
+ 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;
+ struct channel_path_desc desc;
+ } *scpd_area;
+
+ scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+ if (!scpd_area)
+ return -ENOMEM;
+
+ scpd_area->request = (struct chsc_header) {
+ .length = 0x0010,
+ .code = 0x0002,
+ };
+
+ scpd_area->first_chpid = chpid;
+ scpd_area->last_chpid = chpid;
+
+ ccode = chsc(scpd_area);
+ if (ccode > 0) {
+ ret = (ccode == 3) ? -ENODEV : -EBUSY;
+ goto out;
+ }
+
+ switch (scpd_area->response.code) {
+ case 0x0001: /* Success. */
+ memcpy(desc, &scpd_area->desc,
+ sizeof(struct channel_path_desc));
+ ret = 0;
+ break;
+ case 0x0003: /* Invalid block. */
+ case 0x0007: /* Invalid format. */
+ case 0x0008: /* Other invalid block. */
+ CIO_CRW_EVENT(2, "Error in chsc request block!\n");
+ ret = -EINVAL;
+ break;
+ case 0x0004: /* Command not provided in model. */
+ CIO_CRW_EVENT(2, "Model does not provide scpd\n");
+ ret = -EOPNOTSUPP;
+ break;
+ default:
+ CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
+ scpd_area->response.code);
+ ret = -EIO;
+ }
+out:
+ free_page((unsigned long)scpd_area);
+ return ret;
+}
+
+/*
+ * Entries for chpids on the system bus.
+ * This replaces /proc/chpids.
+ */
+static int
+new_channel_path(int chpid)
+{
+ struct channel_path *chp;
+ int ret;
+
+ chp = kmalloc(sizeof(struct channel_path), GFP_KERNEL);
+ if (!chp)
+ return -ENOMEM;
+ memset(chp, 0, sizeof(struct channel_path));
+
+ /* fill in status, etc. */
+ chp->id = chpid;
+ chp->state = 1;
+ chp->dev = (struct device) {
+ .parent = &css_bus_device,
+ .release = chp_release,
+ };
+ snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp0.%x", chpid);
+
+ /* Obtain channel path description and fill it in. */
+ ret = chsc_determine_channel_path_description(chpid, &chp->desc);
+ if (ret)
+ goto out_free;
+
+ /* make it known to the system */
+ ret = device_register(&chp->dev);
+ if (ret) {
+ printk(KERN_WARNING "%s: could not register %02x\n",
+ __func__, chpid);
+ goto out_free;
+ }
+ ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
+ if (ret) {
+ device_unregister(&chp->dev);
+ goto out_free;
+ } else
+ chps[chpid] = chp;
+ return ret;
+out_free:
+ kfree(chp);
+ return ret;
+}
+
+void *
+chsc_get_chp_desc(struct subchannel *sch, int chp_no)
+{
+ struct channel_path *chp;
+ struct channel_path_desc *desc;
+
+ chp = chps[sch->schib.pmcw.chpid[chp_no]];
+ if (!chp)
+ return NULL;
+ desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
+ if (!desc)
+ return NULL;
+ memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
+ return desc;
+}
+
+
+static int __init
+chsc_alloc_sei_area(void)
+{
+ sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+ if (!sei_page)
+ printk(KERN_WARNING"Can't allocate page for processing of " \
+ "chsc machine checks!\n");
+ return (sei_page ? 0 : -ENOMEM);
+}
+
+subsys_initcall(chsc_alloc_sei_area);
+
+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[518];
+ } *scsc_area;
+
+ scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
+ if (!scsc_area) {
+ printk(KERN_WARNING"cio: Was not able to determine available" \
+ "CHSCs due to no memory.\n");
+ return -ENOMEM;
+ }
+
+ scsc_area->request = (struct chsc_header) {
+ .length = 0x0010,
+ .code = 0x0010,
+ };
+
+ result = chsc(scsc_area);
+ if (result) {
+ printk(KERN_WARNING"cio: Was not able to determine " \
+ "available CHSCs, cc=%i.\n", result);
+ result = -EIO;
+ goto exit;
+ }
+
+ if (scsc_area->response.code != 1) {
+ printk(KERN_WARNING"cio: Was not able to determine " \
+ "available CHSCs.\n");
+ result = -EIO;
+ goto exit;
+ }
+ memcpy(&css_general_characteristics, scsc_area->general_char,
+ sizeof(css_general_characteristics));
+ memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
+ sizeof(css_chsc_characteristics));
+exit:
+ free_page ((unsigned long) scsc_area);
+ return result;
+}
+
+EXPORT_SYMBOL_GPL(css_general_characteristics);
+EXPORT_SYMBOL_GPL(css_chsc_characteristics);