[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/drivers/s390/cio/cio.c b/src/kernel/linux/v4.14/drivers/s390/cio/cio.c
new file mode 100644
index 0000000..8921617
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/s390/cio/cio.c
@@ -0,0 +1,1083 @@
+/*
+ * S/390 common I/O routines -- low level i/o calls
+ *
+ * Copyright IBM Corp. 1999, 2008
+ * Author(s): Ingo Adlung (adlung@de.ibm.com)
+ * Cornelia Huck (cornelia.huck@de.ibm.com)
+ * Arnd Bergmann (arndb@de.ibm.com)
+ * Martin Schwidefsky (schwidefsky@de.ibm.com)
+ */
+
+#define KMSG_COMPONENT "cio"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/ftrace.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/kernel_stat.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <asm/cio.h>
+#include <asm/delay.h>
+#include <asm/irq.h>
+#include <asm/irq_regs.h>
+#include <asm/setup.h>
+#include <asm/reset.h>
+#include <asm/ipl.h>
+#include <asm/chpid.h>
+#include <asm/airq.h>
+#include <asm/isc.h>
+#include <linux/sched/cputime.h>
+#include <asm/fcx.h>
+#include <asm/nmi.h>
+#include <asm/crw.h>
+#include "cio.h"
+#include "css.h"
+#include "chsc.h"
+#include "ioasm.h"
+#include "io_sch.h"
+#include "blacklist.h"
+#include "cio_debug.h"
+#include "chp.h"
+#include "trace.h"
+
+debug_info_t *cio_debug_msg_id;
+debug_info_t *cio_debug_trace_id;
+debug_info_t *cio_debug_crw_id;
+
+DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb);
+EXPORT_PER_CPU_SYMBOL(cio_irb);
+
+/*
+ * Function: cio_debug_init
+ * Initializes three debug logs for common I/O:
+ * - cio_msg logs generic cio messages
+ * - cio_trace logs the calling of different functions
+ * - cio_crw logs machine check related cio messages
+ */
+static int __init cio_debug_init(void)
+{
+ cio_debug_msg_id = debug_register("cio_msg", 16, 1, 11 * sizeof(long));
+ if (!cio_debug_msg_id)
+ goto out_unregister;
+ debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
+ debug_set_level(cio_debug_msg_id, 2);
+ cio_debug_trace_id = debug_register("cio_trace", 16, 1, 16);
+ if (!cio_debug_trace_id)
+ goto out_unregister;
+ debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
+ debug_set_level(cio_debug_trace_id, 2);
+ cio_debug_crw_id = debug_register("cio_crw", 8, 1, 8 * sizeof(long));
+ if (!cio_debug_crw_id)
+ goto out_unregister;
+ debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
+ debug_set_level(cio_debug_crw_id, 4);
+ return 0;
+
+out_unregister:
+ debug_unregister(cio_debug_msg_id);
+ debug_unregister(cio_debug_trace_id);
+ debug_unregister(cio_debug_crw_id);
+ return -1;
+}
+
+arch_initcall (cio_debug_init);
+
+int cio_set_options(struct subchannel *sch, int flags)
+{
+ struct io_subchannel_private *priv = to_io_private(sch);
+
+ priv->options.suspend = (flags & DOIO_ALLOW_SUSPEND) != 0;
+ priv->options.prefetch = (flags & DOIO_DENY_PREFETCH) != 0;
+ priv->options.inter = (flags & DOIO_SUPPRESS_INTER) != 0;
+ return 0;
+}
+
+static int
+cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
+{
+ char dbf_text[15];
+
+ if (lpm != 0)
+ sch->lpm &= ~lpm;
+ else
+ sch->lpm = 0;
+
+ CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
+ "subchannel 0.%x.%04x!\n", sch->schid.ssid,
+ sch->schid.sch_no);
+
+ if (cio_update_schib(sch))
+ return -ENODEV;
+
+ sprintf(dbf_text, "no%s", dev_name(&sch->dev));
+ CIO_TRACE_EVENT(0, dbf_text);
+ CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
+
+ return (sch->lpm ? -EACCES : -ENODEV);
+}
+
+int
+cio_start_key (struct subchannel *sch, /* subchannel structure */
+ struct ccw1 * cpa, /* logical channel prog addr */
+ __u8 lpm, /* logical path mask */
+ __u8 key) /* storage key */
+{
+ struct io_subchannel_private *priv = to_io_private(sch);
+ union orb *orb = &priv->orb;
+ int ccode;
+
+ CIO_TRACE_EVENT(5, "stIO");
+ CIO_TRACE_EVENT(5, dev_name(&sch->dev));
+
+ memset(orb, 0, sizeof(union orb));
+ /* sch is always under 2G. */
+ orb->cmd.intparm = (u32)(addr_t)sch;
+ orb->cmd.fmt = 1;
+
+ orb->cmd.pfch = priv->options.prefetch == 0;
+ orb->cmd.spnd = priv->options.suspend;
+ orb->cmd.ssic = priv->options.suspend && priv->options.inter;
+ orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;
+ /*
+ * for 64 bit we always support 64 bit IDAWs with 4k page size only
+ */
+ orb->cmd.c64 = 1;
+ orb->cmd.i2k = 0;
+ orb->cmd.key = key >> 4;
+ /* issue "Start Subchannel" */
+ orb->cmd.cpa = (__u32) __pa(cpa);
+ ccode = ssch(sch->schid, orb);
+
+ /* process condition code */
+ CIO_HEX_EVENT(5, &ccode, sizeof(ccode));
+
+ switch (ccode) {
+ case 0:
+ /*
+ * initialize device status information
+ */
+ sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
+ return 0;
+ case 1: /* status pending */
+ case 2: /* busy */
+ return -EBUSY;
+ case 3: /* device/path not operational */
+ return cio_start_handle_notoper(sch, lpm);
+ default:
+ return ccode;
+ }
+}
+EXPORT_SYMBOL_GPL(cio_start_key);
+
+int
+cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
+{
+ return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
+}
+EXPORT_SYMBOL_GPL(cio_start);
+
+/*
+ * resume suspended I/O operation
+ */
+int
+cio_resume (struct subchannel *sch)
+{
+ int ccode;
+
+ CIO_TRACE_EVENT(4, "resIO");
+ CIO_TRACE_EVENT(4, dev_name(&sch->dev));
+
+ ccode = rsch (sch->schid);
+
+ CIO_HEX_EVENT(4, &ccode, sizeof(ccode));
+
+ switch (ccode) {
+ case 0:
+ sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;
+ return 0;
+ case 1:
+ return -EBUSY;
+ case 2:
+ return -EINVAL;
+ default:
+ /*
+ * useless to wait for request completion
+ * as device is no longer operational !
+ */
+ return -ENODEV;
+ }
+}
+EXPORT_SYMBOL_GPL(cio_resume);
+
+/*
+ * halt I/O operation
+ */
+int
+cio_halt(struct subchannel *sch)
+{
+ int ccode;
+
+ if (!sch)
+ return -ENODEV;
+
+ CIO_TRACE_EVENT(2, "haltIO");
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
+
+ /*
+ * Issue "Halt subchannel" and process condition code
+ */
+ ccode = hsch (sch->schid);
+
+ CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
+
+ switch (ccode) {
+ case 0:
+ sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
+ return 0;
+ case 1: /* status pending */
+ case 2: /* busy */
+ return -EBUSY;
+ default: /* device not operational */
+ return -ENODEV;
+ }
+}
+EXPORT_SYMBOL_GPL(cio_halt);
+
+/*
+ * Clear I/O operation
+ */
+int
+cio_clear(struct subchannel *sch)
+{
+ int ccode;
+
+ if (!sch)
+ return -ENODEV;
+
+ CIO_TRACE_EVENT(2, "clearIO");
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
+
+ /*
+ * Issue "Clear subchannel" and process condition code
+ */
+ ccode = csch (sch->schid);
+
+ CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
+
+ switch (ccode) {
+ case 0:
+ sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;
+ return 0;
+ default: /* device not operational */
+ return -ENODEV;
+ }
+}
+EXPORT_SYMBOL_GPL(cio_clear);
+
+/*
+ * Function: cio_cancel
+ * Issues a "Cancel Subchannel" on the specified subchannel
+ * Note: We don't need any fancy intparms and flags here
+ * since xsch is executed synchronously.
+ * Only for common I/O internal use as for now.
+ */
+int
+cio_cancel (struct subchannel *sch)
+{
+ int ccode;
+
+ if (!sch)
+ return -ENODEV;
+
+ CIO_TRACE_EVENT(2, "cancelIO");
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
+
+ ccode = xsch (sch->schid);
+
+ CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
+
+ switch (ccode) {
+ case 0: /* success */
+ /* Update information in scsw. */
+ if (cio_update_schib(sch))
+ return -ENODEV;
+ return 0;
+ case 1: /* status pending */
+ return -EBUSY;
+ case 2: /* not applicable */
+ return -EINVAL;
+ default: /* not oper */
+ return -ENODEV;
+ }
+}
+EXPORT_SYMBOL_GPL(cio_cancel);
+
+/**
+ * cio_cancel_halt_clear - Cancel running I/O by performing cancel, halt
+ * and clear ordinally if subchannel is valid.
+ * @sch: subchannel on which to perform the cancel_halt_clear operation
+ * @iretry: the number of the times remained to retry the next operation
+ *
+ * This should be called repeatedly since halt/clear are asynchronous
+ * operations. We do one try with cio_cancel, three tries with cio_halt,
+ * 255 tries with cio_clear. The caller should initialize @iretry with
+ * the value 255 for its first call to this, and keep using the same
+ * @iretry in the subsequent calls until it gets a non -EBUSY return.
+ *
+ * Returns 0 if device now idle, -ENODEV for device not operational,
+ * -EBUSY if an interrupt is expected (either from halt/clear or from a
+ * status pending), and -EIO if out of retries.
+ */
+int cio_cancel_halt_clear(struct subchannel *sch, int *iretry)
+{
+ int ret;
+
+ if (cio_update_schib(sch))
+ return -ENODEV;
+ if (!sch->schib.pmcw.ena)
+ /* Not operational -> done. */
+ return 0;
+ /* Stage 1: cancel io. */
+ if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
+ !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
+ if (!scsw_is_tm(&sch->schib.scsw)) {
+ ret = cio_cancel(sch);
+ if (ret != -EINVAL)
+ return ret;
+ }
+ /*
+ * Cancel io unsuccessful or not applicable (transport mode).
+ * Continue with asynchronous instructions.
+ */
+ *iretry = 3; /* 3 halt retries. */
+ }
+ /* Stage 2: halt io. */
+ if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
+ if (*iretry) {
+ *iretry -= 1;
+ ret = cio_halt(sch);
+ if (ret != -EBUSY)
+ return (ret == 0) ? -EBUSY : ret;
+ }
+ /* Halt io unsuccessful. */
+ *iretry = 255; /* 255 clear retries. */
+ }
+ /* Stage 3: clear io. */
+ if (*iretry) {
+ *iretry -= 1;
+ ret = cio_clear(sch);
+ return (ret == 0) ? -EBUSY : ret;
+ }
+ /* Function was unsuccessful */
+ return -EIO;
+}
+EXPORT_SYMBOL_GPL(cio_cancel_halt_clear);
+
+static void cio_apply_config(struct subchannel *sch, struct schib *schib)
+{
+ schib->pmcw.intparm = sch->config.intparm;
+ schib->pmcw.mbi = sch->config.mbi;
+ schib->pmcw.isc = sch->config.isc;
+ schib->pmcw.ena = sch->config.ena;
+ schib->pmcw.mme = sch->config.mme;
+ schib->pmcw.mp = sch->config.mp;
+ schib->pmcw.csense = sch->config.csense;
+ schib->pmcw.mbfc = sch->config.mbfc;
+ if (sch->config.mbfc)
+ schib->mba = sch->config.mba;
+}
+
+static int cio_check_config(struct subchannel *sch, struct schib *schib)
+{
+ return (schib->pmcw.intparm == sch->config.intparm) &&
+ (schib->pmcw.mbi == sch->config.mbi) &&
+ (schib->pmcw.isc == sch->config.isc) &&
+ (schib->pmcw.ena == sch->config.ena) &&
+ (schib->pmcw.mme == sch->config.mme) &&
+ (schib->pmcw.mp == sch->config.mp) &&
+ (schib->pmcw.csense == sch->config.csense) &&
+ (schib->pmcw.mbfc == sch->config.mbfc) &&
+ (!sch->config.mbfc || (schib->mba == sch->config.mba));
+}
+
+/*
+ * cio_commit_config - apply configuration to the subchannel
+ */
+int cio_commit_config(struct subchannel *sch)
+{
+ int ccode, retry, ret = 0;
+ struct schib schib;
+ struct irb irb;
+
+ if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
+ return -ENODEV;
+
+ for (retry = 0; retry < 5; retry++) {
+ /* copy desired changes to local schib */
+ cio_apply_config(sch, &schib);
+ ccode = msch(sch->schid, &schib);
+ if (ccode < 0) /* -EIO if msch gets a program check. */
+ return ccode;
+ switch (ccode) {
+ case 0: /* successful */
+ if (stsch(sch->schid, &schib) ||
+ !css_sch_is_valid(&schib))
+ return -ENODEV;
+ if (cio_check_config(sch, &schib)) {
+ /* commit changes from local schib */
+ memcpy(&sch->schib, &schib, sizeof(schib));
+ return 0;
+ }
+ ret = -EAGAIN;
+ break;
+ case 1: /* status pending */
+ ret = -EBUSY;
+ if (tsch(sch->schid, &irb))
+ return ret;
+ break;
+ case 2: /* busy */
+ udelay(100); /* allow for recovery */
+ ret = -EBUSY;
+ break;
+ case 3: /* not operational */
+ return -ENODEV;
+ }
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cio_commit_config);
+
+/**
+ * cio_update_schib - Perform stsch and update schib if subchannel is valid.
+ * @sch: subchannel on which to perform stsch
+ * Return zero on success, -ENODEV otherwise.
+ */
+int cio_update_schib(struct subchannel *sch)
+{
+ struct schib schib;
+
+ if (stsch(sch->schid, &schib) || !css_sch_is_valid(&schib))
+ return -ENODEV;
+
+ memcpy(&sch->schib, &schib, sizeof(schib));
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cio_update_schib);
+
+/**
+ * cio_enable_subchannel - enable a subchannel.
+ * @sch: subchannel to be enabled
+ * @intparm: interruption parameter to set
+ */
+int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
+{
+ int ret;
+
+ CIO_TRACE_EVENT(2, "ensch");
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
+
+ if (sch_is_pseudo_sch(sch))
+ return -EINVAL;
+ if (cio_update_schib(sch))
+ return -ENODEV;
+
+ sch->config.ena = 1;
+ sch->config.isc = sch->isc;
+ sch->config.intparm = intparm;
+
+ ret = cio_commit_config(sch);
+ if (ret == -EIO) {
+ /*
+ * Got a program check in msch. Try without
+ * the concurrent sense bit the next time.
+ */
+ sch->config.csense = 0;
+ ret = cio_commit_config(sch);
+ }
+ CIO_HEX_EVENT(2, &ret, sizeof(ret));
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cio_enable_subchannel);
+
+/**
+ * cio_disable_subchannel - disable a subchannel.
+ * @sch: subchannel to disable
+ */
+int cio_disable_subchannel(struct subchannel *sch)
+{
+ int ret;
+
+ CIO_TRACE_EVENT(2, "dissch");
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
+
+ if (sch_is_pseudo_sch(sch))
+ return 0;
+ if (cio_update_schib(sch))
+ return -ENODEV;
+
+ sch->config.ena = 0;
+ ret = cio_commit_config(sch);
+
+ CIO_HEX_EVENT(2, &ret, sizeof(ret));
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cio_disable_subchannel);
+
+static int cio_check_devno_blacklisted(struct subchannel *sch)
+{
+ if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) {
+ /*
+ * This device must not be known to Linux. So we simply
+ * say that there is no device and return ENODEV.
+ */
+ CIO_MSG_EVENT(6, "Blacklisted device detected "
+ "at devno %04X, subchannel set %x\n",
+ sch->schib.pmcw.dev, sch->schid.ssid);
+ return -ENODEV;
+ }
+ return 0;
+}
+
+/**
+ * cio_validate_subchannel - basic validation of subchannel
+ * @sch: subchannel structure to be filled out
+ * @schid: subchannel id
+ *
+ * Find out subchannel type and initialize struct subchannel.
+ * Return codes:
+ * 0 on success
+ * -ENXIO for non-defined subchannels
+ * -ENODEV for invalid subchannels or blacklisted devices
+ * -EIO for subchannels in an invalid subchannel set
+ */
+int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid)
+{
+ char dbf_txt[15];
+ int ccode;
+ int err;
+
+ sprintf(dbf_txt, "valsch%x", schid.sch_no);
+ CIO_TRACE_EVENT(4, dbf_txt);
+
+ /*
+ * The first subchannel that is not-operational (ccode==3)
+ * indicates that there aren't any more devices available.
+ * If stsch gets an exception, it means the current subchannel set
+ * is not valid.
+ */
+ ccode = stsch(schid, &sch->schib);
+ if (ccode) {
+ err = (ccode == 3) ? -ENXIO : ccode;
+ goto out;
+ }
+ sch->st = sch->schib.pmcw.st;
+ sch->schid = schid;
+
+ switch (sch->st) {
+ case SUBCHANNEL_TYPE_IO:
+ case SUBCHANNEL_TYPE_MSG:
+ if (!css_sch_is_valid(&sch->schib))
+ err = -ENODEV;
+ else
+ err = cio_check_devno_blacklisted(sch);
+ break;
+ default:
+ err = 0;
+ }
+ if (err)
+ goto out;
+
+ CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
+ sch->schid.ssid, sch->schid.sch_no, sch->st);
+out:
+ return err;
+}
+
+/*
+ * do_cio_interrupt() handles all normal I/O device IRQ's
+ */
+static irqreturn_t do_cio_interrupt(int irq, void *dummy)
+{
+ struct tpi_info *tpi_info;
+ struct subchannel *sch;
+ struct irb *irb;
+
+ set_cpu_flag(CIF_NOHZ_DELAY);
+ tpi_info = (struct tpi_info *) &get_irq_regs()->int_code;
+ trace_s390_cio_interrupt(tpi_info);
+ irb = this_cpu_ptr(&cio_irb);
+ sch = (struct subchannel *)(unsigned long) tpi_info->intparm;
+ if (!sch) {
+ /* Clear pending interrupt condition. */
+ inc_irq_stat(IRQIO_CIO);
+ tsch(tpi_info->schid, irb);
+ return IRQ_HANDLED;
+ }
+ spin_lock(sch->lock);
+ /* Store interrupt response block to lowcore. */
+ if (tsch(tpi_info->schid, irb) == 0) {
+ /* Keep subchannel information word up to date. */
+ memcpy (&sch->schib.scsw, &irb->scsw, sizeof (irb->scsw));
+ /* Call interrupt handler if there is one. */
+ if (sch->driver && sch->driver->irq)
+ sch->driver->irq(sch);
+ else
+ inc_irq_stat(IRQIO_CIO);
+ } else
+ inc_irq_stat(IRQIO_CIO);
+ spin_unlock(sch->lock);
+
+ return IRQ_HANDLED;
+}
+
+static struct irqaction io_interrupt = {
+ .name = "IO",
+ .handler = do_cio_interrupt,
+};
+
+void __init init_cio_interrupts(void)
+{
+ irq_set_chip_and_handler(IO_INTERRUPT,
+ &dummy_irq_chip, handle_percpu_irq);
+ setup_irq(IO_INTERRUPT, &io_interrupt);
+}
+
+#ifdef CONFIG_CCW_CONSOLE
+static struct subchannel *console_sch;
+static struct lock_class_key console_sch_key;
+
+/*
+ * Use cio_tsch to update the subchannel status and call the interrupt handler
+ * if status had been pending. Called with the subchannel's lock held.
+ */
+void cio_tsch(struct subchannel *sch)
+{
+ struct irb *irb;
+ int irq_context;
+
+ irb = this_cpu_ptr(&cio_irb);
+ /* Store interrupt response block to lowcore. */
+ if (tsch(sch->schid, irb) != 0)
+ /* Not status pending or not operational. */
+ return;
+ memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw));
+ /* Call interrupt handler with updated status. */
+ irq_context = in_interrupt();
+ if (!irq_context) {
+ local_bh_disable();
+ irq_enter();
+ }
+ kstat_incr_irq_this_cpu(IO_INTERRUPT);
+ if (sch->driver && sch->driver->irq)
+ sch->driver->irq(sch);
+ else
+ inc_irq_stat(IRQIO_CIO);
+ if (!irq_context) {
+ irq_exit();
+ _local_bh_enable();
+ }
+}
+
+static int cio_test_for_console(struct subchannel_id schid, void *data)
+{
+ struct schib schib;
+
+ if (stsch(schid, &schib) != 0)
+ return -ENXIO;
+ if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
+ (schib.pmcw.dev == console_devno)) {
+ console_irq = schid.sch_no;
+ return 1; /* found */
+ }
+ return 0;
+}
+
+static int cio_get_console_sch_no(void)
+{
+ struct subchannel_id schid;
+ struct schib schib;
+
+ init_subchannel_id(&schid);
+ if (console_irq != -1) {
+ /* VM provided us with the irq number of the console. */
+ schid.sch_no = console_irq;
+ if (stsch(schid, &schib) != 0 ||
+ (schib.pmcw.st != SUBCHANNEL_TYPE_IO) || !schib.pmcw.dnv)
+ return -1;
+ console_devno = schib.pmcw.dev;
+ } else if (console_devno != -1) {
+ /* At least the console device number is known. */
+ for_each_subchannel(cio_test_for_console, NULL);
+ }
+ return console_irq;
+}
+
+struct subchannel *cio_probe_console(void)
+{
+ struct subchannel_id schid;
+ struct subchannel *sch;
+ int sch_no, ret;
+
+ sch_no = cio_get_console_sch_no();
+ if (sch_no == -1) {
+ pr_warn("No CCW console was found\n");
+ return ERR_PTR(-ENODEV);
+ }
+ init_subchannel_id(&schid);
+ schid.sch_no = sch_no;
+ sch = css_alloc_subchannel(schid);
+ if (IS_ERR(sch))
+ return sch;
+
+ lockdep_set_class(sch->lock, &console_sch_key);
+ isc_register(CONSOLE_ISC);
+ sch->config.isc = CONSOLE_ISC;
+ sch->config.intparm = (u32)(addr_t)sch;
+ ret = cio_commit_config(sch);
+ if (ret) {
+ isc_unregister(CONSOLE_ISC);
+ put_device(&sch->dev);
+ return ERR_PTR(ret);
+ }
+ console_sch = sch;
+ return sch;
+}
+
+int cio_is_console(struct subchannel_id schid)
+{
+ if (!console_sch)
+ return 0;
+ return schid_equal(&schid, &console_sch->schid);
+}
+
+void cio_register_early_subchannels(void)
+{
+ int ret;
+
+ if (!console_sch)
+ return;
+
+ ret = css_register_subchannel(console_sch);
+ if (ret)
+ put_device(&console_sch->dev);
+}
+#endif /* CONFIG_CCW_CONSOLE */
+
+static int
+__disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
+{
+ int retry, cc;
+
+ cc = 0;
+ for (retry=0;retry<3;retry++) {
+ schib->pmcw.ena = 0;
+ cc = msch(schid, schib);
+ if (cc)
+ return (cc==3?-ENODEV:-EBUSY);
+ if (stsch(schid, schib) || !css_sch_is_valid(schib))
+ return -ENODEV;
+ if (!schib->pmcw.ena)
+ return 0;
+ }
+ return -EBUSY; /* uhm... */
+}
+
+static int
+__clear_io_subchannel_easy(struct subchannel_id schid)
+{
+ int retry;
+
+ if (csch(schid))
+ return -ENODEV;
+ for (retry=0;retry<20;retry++) {
+ struct tpi_info ti;
+
+ if (tpi(&ti)) {
+ tsch(ti.schid, this_cpu_ptr(&cio_irb));
+ if (schid_equal(&ti.schid, &schid))
+ return 0;
+ }
+ udelay_simple(100);
+ }
+ return -EBUSY;
+}
+
+static void __clear_chsc_subchannel_easy(void)
+{
+ /* It seems we can only wait for a bit here :/ */
+ udelay_simple(100);
+}
+
+static int pgm_check_occured;
+
+static void cio_reset_pgm_check_handler(void)
+{
+ pgm_check_occured = 1;
+}
+
+static int stsch_reset(struct subchannel_id schid, struct schib *addr)
+{
+ int rc;
+
+ pgm_check_occured = 0;
+ s390_base_pgm_handler_fn = cio_reset_pgm_check_handler;
+ rc = stsch(schid, addr);
+ s390_base_pgm_handler_fn = NULL;
+
+ /* The program check handler could have changed pgm_check_occured. */
+ barrier();
+
+ if (pgm_check_occured)
+ return -EIO;
+ else
+ return rc;
+}
+
+static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
+{
+ struct schib schib;
+
+ if (stsch_reset(schid, &schib))
+ return -ENXIO;
+ if (!schib.pmcw.ena)
+ return 0;
+ switch(__disable_subchannel_easy(schid, &schib)) {
+ case 0:
+ case -ENODEV:
+ break;
+ default: /* -EBUSY */
+ switch (schib.pmcw.st) {
+ case SUBCHANNEL_TYPE_IO:
+ if (__clear_io_subchannel_easy(schid))
+ goto out; /* give up... */
+ break;
+ case SUBCHANNEL_TYPE_CHSC:
+ __clear_chsc_subchannel_easy();
+ break;
+ default:
+ /* No default clear strategy */
+ break;
+ }
+ stsch(schid, &schib);
+ __disable_subchannel_easy(schid, &schib);
+ }
+out:
+ return 0;
+}
+
+static atomic_t chpid_reset_count;
+
+static void s390_reset_chpids_mcck_handler(void)
+{
+ struct crw crw;
+ union mci mci;
+
+ /* Check for pending channel report word. */
+ mci.val = S390_lowcore.mcck_interruption_code;
+ if (!mci.cp)
+ return;
+ /* Process channel report words. */
+ while (stcrw(&crw) == 0) {
+ /* Check for responses to RCHP. */
+ if (crw.slct && crw.rsc == CRW_RSC_CPATH)
+ atomic_dec(&chpid_reset_count);
+ }
+}
+
+#define RCHP_TIMEOUT (30 * USEC_PER_SEC)
+static void css_reset(void)
+{
+ int i, ret;
+ unsigned long long timeout;
+ struct chp_id chpid;
+
+ /* Reset subchannels. */
+ for_each_subchannel(__shutdown_subchannel_easy, NULL);
+ /* Reset channel paths. */
+ s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler;
+ /* Enable channel report machine checks. */
+ __ctl_set_bit(14, 28);
+ /* Temporarily reenable machine checks. */
+ local_mcck_enable();
+ chp_id_init(&chpid);
+ for (i = 0; i <= __MAX_CHPID; i++) {
+ chpid.id = i;
+ ret = rchp(chpid);
+ if ((ret == 0) || (ret == 2))
+ /*
+ * rchp either succeeded, or another rchp is already
+ * in progress. In either case, we'll get a crw.
+ */
+ atomic_inc(&chpid_reset_count);
+ }
+ /* Wait for machine check for all channel paths. */
+ timeout = get_tod_clock_fast() + (RCHP_TIMEOUT << 12);
+ while (atomic_read(&chpid_reset_count) != 0) {
+ if (get_tod_clock_fast() > timeout)
+ break;
+ cpu_relax();
+ }
+ /* Disable machine checks again. */
+ local_mcck_disable();
+ /* Disable channel report machine checks. */
+ __ctl_clear_bit(14, 28);
+ s390_base_mcck_handler_fn = NULL;
+}
+
+static struct reset_call css_reset_call = {
+ .fn = css_reset,
+};
+
+static int __init init_css_reset_call(void)
+{
+ atomic_set(&chpid_reset_count, 0);
+ register_reset_call(&css_reset_call);
+ return 0;
+}
+
+arch_initcall(init_css_reset_call);
+
+struct sch_match_id {
+ struct subchannel_id schid;
+ struct ccw_dev_id devid;
+ int rc;
+};
+
+static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
+{
+ struct schib schib;
+ struct sch_match_id *match_id = data;
+
+ if (stsch_reset(schid, &schib))
+ return -ENXIO;
+ if ((schib.pmcw.st == SUBCHANNEL_TYPE_IO) && schib.pmcw.dnv &&
+ (schib.pmcw.dev == match_id->devid.devno) &&
+ (schid.ssid == match_id->devid.ssid)) {
+ match_id->schid = schid;
+ match_id->rc = 0;
+ return 1;
+ }
+ return 0;
+}
+
+static int reipl_find_schid(struct ccw_dev_id *devid,
+ struct subchannel_id *schid)
+{
+ struct sch_match_id match_id;
+
+ match_id.devid = *devid;
+ match_id.rc = -ENODEV;
+ for_each_subchannel(__reipl_subchannel_match, &match_id);
+ if (match_id.rc == 0)
+ *schid = match_id.schid;
+ return match_id.rc;
+}
+
+extern void do_reipl_asm(__u32 schid);
+
+/* Make sure all subchannels are quiet before we re-ipl an lpar. */
+void reipl_ccw_dev(struct ccw_dev_id *devid)
+{
+ struct subchannel_id uninitialized_var(schid);
+
+ s390_reset_system();
+ if (reipl_find_schid(devid, &schid) != 0)
+ panic("IPL Device not found\n");
+ do_reipl_asm(*((__u32*)&schid));
+}
+
+int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
+{
+ static struct chsc_sda_area sda_area __initdata;
+ struct subchannel_id schid;
+ struct schib schib;
+
+ schid = *(struct subchannel_id *)&S390_lowcore.subchannel_id;
+ if (!schid.one)
+ return -ENODEV;
+
+ if (schid.ssid) {
+ /*
+ * Firmware should have already enabled MSS but whoever started
+ * the kernel might have initiated a channel subsystem reset.
+ * Ensure that MSS is enabled.
+ */
+ memset(&sda_area, 0, sizeof(sda_area));
+ if (__chsc_enable_facility(&sda_area, CHSC_SDA_OC_MSS))
+ return -ENODEV;
+ }
+ if (stsch(schid, &schib))
+ return -ENODEV;
+ if (schib.pmcw.st != SUBCHANNEL_TYPE_IO)
+ return -ENODEV;
+ if (!schib.pmcw.dnv)
+ return -ENODEV;
+
+ iplinfo->ssid = schid.ssid;
+ iplinfo->devno = schib.pmcw.dev;
+ iplinfo->is_qdio = schib.pmcw.qf;
+ return 0;
+}
+
+/**
+ * cio_tm_start_key - perform start function
+ * @sch: subchannel on which to perform the start function
+ * @tcw: transport-command word to be started
+ * @lpm: mask of paths to use
+ * @key: storage key to use for storage access
+ *
+ * Start the tcw on the given subchannel. Return zero on success, non-zero
+ * otherwise.
+ */
+int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key)
+{
+ int cc;
+ union orb *orb = &to_io_private(sch)->orb;
+
+ memset(orb, 0, sizeof(union orb));
+ orb->tm.intparm = (u32) (addr_t) sch;
+ orb->tm.key = key >> 4;
+ orb->tm.b = 1;
+ orb->tm.lpm = lpm ? lpm : sch->lpm;
+ orb->tm.tcw = (u32) (addr_t) tcw;
+ cc = ssch(sch->schid, orb);
+ switch (cc) {
+ case 0:
+ return 0;
+ case 1:
+ case 2:
+ return -EBUSY;
+ default:
+ return cio_start_handle_notoper(sch, lpm);
+ }
+}
+EXPORT_SYMBOL_GPL(cio_tm_start_key);
+
+/**
+ * cio_tm_intrg - perform interrogate function
+ * @sch - subchannel on which to perform the interrogate function
+ *
+ * If the specified subchannel is running in transport-mode, perform the
+ * interrogate function. Return zero on success, non-zero otherwie.
+ */
+int cio_tm_intrg(struct subchannel *sch)
+{
+ int cc;
+
+ if (!to_io_private(sch)->orb.tm.b)
+ return -EINVAL;
+ cc = xsch(sch->schid);
+ switch (cc) {
+ case 0:
+ case 2:
+ return 0;
+ case 1:
+ return -EBUSY;
+ default:
+ return -ENODEV;
+ }
+}
+EXPORT_SYMBOL_GPL(cio_tm_intrg);