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path: root/drivers/s390/cio/device_pgid.c
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Diffstat (limited to 'drivers/s390/cio/device_pgid.c')
-rw-r--r--drivers/s390/cio/device_pgid.c448
1 files changed, 448 insertions, 0 deletions
diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
new file mode 100644
index 00000000000..0adac8a6733
--- /dev/null
+++ b/drivers/s390/cio/device_pgid.c
@@ -0,0 +1,448 @@
+/*
+ * drivers/s390/cio/device_pgid.c
+ *
+ * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
+ * IBM Corporation
+ * Author(s): Cornelia Huck(cohuck@de.ibm.com)
+ * Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * Path Group ID functions.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+#include <asm/ccwdev.h>
+#include <asm/cio.h>
+#include <asm/delay.h>
+#include <asm/lowcore.h>
+
+#include "cio.h"
+#include "cio_debug.h"
+#include "css.h"
+#include "device.h"
+
+/*
+ * Start Sense Path Group ID helper function. Used in ccw_device_recog
+ * and ccw_device_sense_pgid.
+ */
+static int
+__ccw_device_sense_pgid_start(struct ccw_device *cdev)
+{
+ struct subchannel *sch;
+ struct ccw1 *ccw;
+ int ret;
+
+ sch = to_subchannel(cdev->dev.parent);
+ /* Setup sense path group id channel program. */
+ ccw = cdev->private->iccws;
+ ccw->cmd_code = CCW_CMD_SENSE_PGID;
+ ccw->cda = (__u32) __pa (&cdev->private->pgid);
+ ccw->count = sizeof (struct pgid);
+ ccw->flags = CCW_FLAG_SLI;
+
+ /* Reset device status. */
+ memset(&cdev->private->irb, 0, sizeof(struct irb));
+ /* Try on every path. */
+ ret = -ENODEV;
+ while (cdev->private->imask != 0) {
+ /* Try every path multiple times. */
+ if (cdev->private->iretry > 0) {
+ cdev->private->iretry--;
+ ret = cio_start (sch, cdev->private->iccws,
+ cdev->private->imask);
+ /* ret is 0, -EBUSY, -EACCES or -ENODEV */
+ if (ret != -EACCES)
+ return ret;
+ CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel "
+ "%04x, lpm %02X, became 'not "
+ "operational'\n",
+ cdev->private->devno, sch->irq,
+ cdev->private->imask);
+
+ }
+ cdev->private->imask >>= 1;
+ cdev->private->iretry = 5;
+ }
+ return ret;
+}
+
+void
+ccw_device_sense_pgid_start(struct ccw_device *cdev)
+{
+ int ret;
+
+ cdev->private->state = DEV_STATE_SENSE_PGID;
+ cdev->private->imask = 0x80;
+ cdev->private->iretry = 5;
+ memset (&cdev->private->pgid, 0, sizeof (struct pgid));
+ ret = __ccw_device_sense_pgid_start(cdev);
+ if (ret && ret != -EBUSY)
+ ccw_device_sense_pgid_done(cdev, ret);
+}
+
+/*
+ * Called from interrupt context to check if a valid answer
+ * to Sense Path Group ID was received.
+ */
+static int
+__ccw_device_check_sense_pgid(struct ccw_device *cdev)
+{
+ struct subchannel *sch;
+ struct irb *irb;
+
+ sch = to_subchannel(cdev->dev.parent);
+ irb = &cdev->private->irb;
+ if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))
+ return -ETIME;
+ if (irb->esw.esw0.erw.cons &&
+ (irb->ecw[0]&(SNS0_CMD_REJECT|SNS0_INTERVENTION_REQ))) {
+ /*
+ * If the device doesn't support the Sense Path Group ID
+ * command further retries wouldn't help ...
+ */
+ return -EOPNOTSUPP;
+ }
+ if (irb->esw.esw0.erw.cons) {
+ CIO_MSG_EVENT(2, "SNID - device %04x, unit check, "
+ "lpum %02X, cnt %02d, sns : "
+ "%02X%02X%02X%02X %02X%02X%02X%02X ...\n",
+ cdev->private->devno,
+ irb->esw.esw0.sublog.lpum,
+ irb->esw.esw0.erw.scnt,
+ irb->ecw[0], irb->ecw[1],
+ irb->ecw[2], irb->ecw[3],
+ irb->ecw[4], irb->ecw[5],
+ irb->ecw[6], irb->ecw[7]);
+ return -EAGAIN;
+ }
+ if (irb->scsw.cc == 3) {
+ CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel "
+ "%04x, lpm %02X, became 'not operational'\n",
+ cdev->private->devno, sch->irq, sch->orb.lpm);
+ return -EACCES;
+ }
+ if (cdev->private->pgid.inf.ps.state2 == SNID_STATE2_RESVD_ELSE) {
+ CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel %04x "
+ "is reserved by someone else\n",
+ cdev->private->devno, sch->irq);
+ return -EUSERS;
+ }
+ return 0;
+}
+
+/*
+ * Got interrupt for Sense Path Group ID.
+ */
+void
+ccw_device_sense_pgid_irq(struct ccw_device *cdev, enum dev_event dev_event)
+{
+ struct subchannel *sch;
+ struct irb *irb;
+ int ret;
+
+ irb = (struct irb *) __LC_IRB;
+ /* Retry sense pgid for cc=1. */
+ if (irb->scsw.stctl ==
+ (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
+ if (irb->scsw.cc == 1) {
+ ret = __ccw_device_sense_pgid_start(cdev);
+ if (ret && ret != -EBUSY)
+ ccw_device_sense_pgid_done(cdev, ret);
+ }
+ return;
+ }
+ if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
+ return;
+ sch = to_subchannel(cdev->dev.parent);
+ ret = __ccw_device_check_sense_pgid(cdev);
+ memset(&cdev->private->irb, 0, sizeof(struct irb));
+ switch (ret) {
+ /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN, -EACCES or -EUSERS */
+ case 0: /* Sense Path Group ID successful. */
+ if (cdev->private->pgid.inf.ps.state1 == SNID_STATE1_RESET)
+ memcpy(&cdev->private->pgid, &global_pgid,
+ sizeof(struct pgid));
+ ccw_device_sense_pgid_done(cdev, 0);
+ break;
+ case -EOPNOTSUPP: /* Sense Path Group ID not supported */
+ ccw_device_sense_pgid_done(cdev, -EOPNOTSUPP);
+ break;
+ case -ETIME: /* Sense path group id stopped by timeout. */
+ ccw_device_sense_pgid_done(cdev, -ETIME);
+ break;
+ case -EACCES: /* channel is not operational. */
+ sch->lpm &= ~cdev->private->imask;
+ cdev->private->imask >>= 1;
+ cdev->private->iretry = 5;
+ /* Fall through. */
+ case -EAGAIN: /* Try again. */
+ ret = __ccw_device_sense_pgid_start(cdev);
+ if (ret != 0 && ret != -EBUSY)
+ ccw_device_sense_pgid_done(cdev, -ENODEV);
+ break;
+ case -EUSERS: /* device is reserved for someone else. */
+ ccw_device_sense_pgid_done(cdev, -EUSERS);
+ break;
+ }
+}
+
+/*
+ * Path Group ID helper function.
+ */
+static int
+__ccw_device_do_pgid(struct ccw_device *cdev, __u8 func)
+{
+ struct subchannel *sch;
+ struct ccw1 *ccw;
+ int ret;
+
+ sch = to_subchannel(cdev->dev.parent);
+
+ /* Setup sense path group id channel program. */
+ cdev->private->pgid.inf.fc = func;
+ ccw = cdev->private->iccws;
+ if (!cdev->private->flags.pgid_single) {
+ cdev->private->pgid.inf.fc |= SPID_FUNC_MULTI_PATH;
+ ccw->cmd_code = CCW_CMD_SUSPEND_RECONN;
+ ccw->cda = 0;
+ ccw->count = 0;
+ ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC;
+ ccw++;
+ } else
+ cdev->private->pgid.inf.fc |= SPID_FUNC_SINGLE_PATH;
+
+ ccw->cmd_code = CCW_CMD_SET_PGID;
+ ccw->cda = (__u32) __pa (&cdev->private->pgid);
+ ccw->count = sizeof (struct pgid);
+ ccw->flags = CCW_FLAG_SLI;
+
+ /* Reset device status. */
+ memset(&cdev->private->irb, 0, sizeof(struct irb));
+
+ /* Try multiple times. */
+ ret = -ENODEV;
+ if (cdev->private->iretry > 0) {
+ cdev->private->iretry--;
+ ret = cio_start (sch, cdev->private->iccws,
+ cdev->private->imask);
+ /* ret is 0, -EBUSY, -EACCES or -ENODEV */
+ if ((ret != -EACCES) && (ret != -ENODEV))
+ return ret;
+ }
+ /* PGID command failed on this path. Switch it off. */
+ sch->lpm &= ~cdev->private->imask;
+ sch->vpm &= ~cdev->private->imask;
+ CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel "
+ "%04x, lpm %02X, became 'not operational'\n",
+ cdev->private->devno, sch->irq, cdev->private->imask);
+ return ret;
+}
+
+/*
+ * Called from interrupt context to check if a valid answer
+ * to Set Path Group ID was received.
+ */
+static int
+__ccw_device_check_pgid(struct ccw_device *cdev)
+{
+ struct subchannel *sch;
+ struct irb *irb;
+
+ sch = to_subchannel(cdev->dev.parent);
+ irb = &cdev->private->irb;
+ if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))
+ return -ETIME;
+ if (irb->esw.esw0.erw.cons) {
+ if (irb->ecw[0] & SNS0_CMD_REJECT)
+ return -EOPNOTSUPP;
+ /* Hmm, whatever happened, try again. */
+ CIO_MSG_EVENT(2, "SPID - device %04x, unit check, cnt %02d, "
+ "sns : %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
+ cdev->private->devno, irb->esw.esw0.erw.scnt,
+ irb->ecw[0], irb->ecw[1],
+ irb->ecw[2], irb->ecw[3],
+ irb->ecw[4], irb->ecw[5],
+ irb->ecw[6], irb->ecw[7]);
+ return -EAGAIN;
+ }
+ if (irb->scsw.cc == 3) {
+ CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel "
+ "%04x, lpm %02X, became 'not operational'\n",
+ cdev->private->devno, sch->irq,
+ cdev->private->imask);
+ return -EACCES;
+ }
+ return 0;
+}
+
+static void
+__ccw_device_verify_start(struct ccw_device *cdev)
+{
+ struct subchannel *sch;
+ __u8 imask, func;
+ int ret;
+
+ sch = to_subchannel(cdev->dev.parent);
+ while (sch->vpm != sch->lpm) {
+ /* Find first unequal bit in vpm vs. lpm */
+ for (imask = 0x80; imask != 0; imask >>= 1)
+ if ((sch->vpm & imask) != (sch->lpm & imask))
+ break;
+ cdev->private->imask = imask;
+ func = (sch->vpm & imask) ?
+ SPID_FUNC_RESIGN : SPID_FUNC_ESTABLISH;
+ ret = __ccw_device_do_pgid(cdev, func);
+ if (ret == 0 || ret == -EBUSY)
+ return;
+ cdev->private->iretry = 5;
+ }
+ ccw_device_verify_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV);
+}
+
+/*
+ * Got interrupt for Set Path Group ID.
+ */
+void
+ccw_device_verify_irq(struct ccw_device *cdev, enum dev_event dev_event)
+{
+ struct subchannel *sch;
+ struct irb *irb;
+ int ret;
+
+ irb = (struct irb *) __LC_IRB;
+ /* Retry set pgid for cc=1. */
+ if (irb->scsw.stctl ==
+ (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
+ if (irb->scsw.cc == 1)
+ __ccw_device_verify_start(cdev);
+ return;
+ }
+ if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
+ return;
+ sch = to_subchannel(cdev->dev.parent);
+ ret = __ccw_device_check_pgid(cdev);
+ memset(&cdev->private->irb, 0, sizeof(struct irb));
+ switch (ret) {
+ /* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
+ case 0:
+ /* Establish or Resign Path Group done. Update vpm. */
+ if ((sch->lpm & cdev->private->imask) != 0)
+ sch->vpm |= cdev->private->imask;
+ else
+ sch->vpm &= ~cdev->private->imask;
+ cdev->private->iretry = 5;
+ __ccw_device_verify_start(cdev);
+ break;
+ case -EOPNOTSUPP:
+ /*
+ * One of those strange devices which claim to be able
+ * to do multipathing but not for Set Path Group ID.
+ */
+ if (cdev->private->flags.pgid_single) {
+ ccw_device_verify_done(cdev, -EOPNOTSUPP);
+ break;
+ }
+ cdev->private->flags.pgid_single = 1;
+ /* fall through. */
+ case -EAGAIN: /* Try again. */
+ __ccw_device_verify_start(cdev);
+ break;
+ case -ETIME: /* Set path group id stopped by timeout. */
+ ccw_device_verify_done(cdev, -ETIME);
+ break;
+ case -EACCES: /* channel is not operational. */
+ sch->lpm &= ~cdev->private->imask;
+ sch->vpm &= ~cdev->private->imask;
+ cdev->private->iretry = 5;
+ __ccw_device_verify_start(cdev);
+ break;
+ }
+}
+
+void
+ccw_device_verify_start(struct ccw_device *cdev)
+{
+ cdev->private->flags.pgid_single = 0;
+ cdev->private->iretry = 5;
+ __ccw_device_verify_start(cdev);
+}
+
+static void
+__ccw_device_disband_start(struct ccw_device *cdev)
+{
+ struct subchannel *sch;
+ int ret;
+
+ sch = to_subchannel(cdev->dev.parent);
+ while (cdev->private->imask != 0) {
+ if (sch->lpm & cdev->private->imask) {
+ ret = __ccw_device_do_pgid(cdev, SPID_FUNC_DISBAND);
+ if (ret == 0)
+ return;
+ }
+ cdev->private->iretry = 5;
+ cdev->private->imask >>= 1;
+ }
+ ccw_device_verify_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV);
+}
+
+/*
+ * Got interrupt for Unset Path Group ID.
+ */
+void
+ccw_device_disband_irq(struct ccw_device *cdev, enum dev_event dev_event)
+{
+ struct subchannel *sch;
+ struct irb *irb;
+ int ret;
+
+ irb = (struct irb *) __LC_IRB;
+ /* Retry set pgid for cc=1. */
+ if (irb->scsw.stctl ==
+ (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
+ if (irb->scsw.cc == 1)
+ __ccw_device_disband_start(cdev);
+ return;
+ }
+ if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
+ return;
+ sch = to_subchannel(cdev->dev.parent);
+ ret = __ccw_device_check_pgid(cdev);
+ memset(&cdev->private->irb, 0, sizeof(struct irb));
+ switch (ret) {
+ /* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
+ case 0: /* disband successful. */
+ sch->vpm = 0;
+ ccw_device_disband_done(cdev, ret);
+ break;
+ case -EOPNOTSUPP:
+ /*
+ * One of those strange devices which claim to be able
+ * to do multipathing but not for Unset Path Group ID.
+ */
+ cdev->private->flags.pgid_single = 1;
+ /* fall through. */
+ case -EAGAIN: /* Try again. */
+ __ccw_device_disband_start(cdev);
+ break;
+ case -ETIME: /* Set path group id stopped by timeout. */
+ ccw_device_disband_done(cdev, -ETIME);
+ break;
+ case -EACCES: /* channel is not operational. */
+ cdev->private->imask >>= 1;
+ cdev->private->iretry = 5;
+ __ccw_device_disband_start(cdev);
+ break;
+ }
+}
+
+void
+ccw_device_disband_start(struct ccw_device *cdev)
+{
+ cdev->private->flags.pgid_single = 0;
+ cdev->private->iretry = 5;
+ cdev->private->imask = 0x80;
+ __ccw_device_disband_start(cdev);
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-15 06:33:07 +0000