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!

1 files changed, 603 insertions, 0 deletions

diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
new file mode 100644
index 0000000..11e260e
--- /dev/null
+++ b/drivers/s390/cio/device_ops.c
@@ -0,0 +1,603 @@
+/*
+ *  drivers/s390/cio/device_ops.c
+ *
+ *   $Revision: 1.55 $
+ *
+ *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
+ *			 IBM Corporation
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *               Cornelia Huck (cohuck@de.ibm.com)
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+
+#include <asm/ccwdev.h>
+#include <asm/idals.h>
+#include <asm/qdio.h>
+
+#include "cio.h"
+#include "cio_debug.h"
+#include "css.h"
+#include "chsc.h"
+#include "device.h"
+#include "qdio.h"
+
+int
+ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
+{
+       /*
+	* The flag usage is mutal exclusive ...
+	*/
+	if ((flags & CCWDEV_EARLY_NOTIFICATION) &&
+	    (flags & CCWDEV_REPORT_ALL))
+		return -EINVAL;
+	cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
+	cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0;
+	cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0;
+	cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0;
+	return 0;
+}
+
+int
+ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
+{
+	struct subchannel *sch;
+	int ret;
+
+	if (!cdev)
+		return -ENODEV;
+	if (cdev->private->state == DEV_STATE_NOT_OPER)
+		return -ENODEV;
+	if (cdev->private->state != DEV_STATE_ONLINE &&
+	    cdev->private->state != DEV_STATE_WAIT4IO &&
+	    cdev->private->state != DEV_STATE_W4SENSE)
+		return -EINVAL;
+	sch = to_subchannel(cdev->dev.parent);
+	if (!sch)
+		return -ENODEV;
+	ret = cio_clear(sch);
+	if (ret == 0)
+		cdev->private->intparm = intparm;
+	return ret;
+}
+
+int
+ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
+		     unsigned long intparm, __u8 lpm, __u8 key,
+		     unsigned long flags)
+{
+	struct subchannel *sch;
+	int ret;
+
+	if (!cdev)
+		return -ENODEV;
+	sch = to_subchannel(cdev->dev.parent);
+	if (!sch)
+		return -ENODEV;
+	if (cdev->private->state == DEV_STATE_NOT_OPER)
+		return -ENODEV;
+	if (cdev->private->state == DEV_STATE_VERIFY) {
+		/* Remember to fake irb when finished. */
+		if (!cdev->private->flags.fake_irb) {
+			cdev->private->flags.fake_irb = 1;
+			cdev->private->intparm = intparm;
+			return 0;
+		} else
+			/* There's already a fake I/O around. */
+			return -EBUSY;
+	}
+	if (cdev->private->state != DEV_STATE_ONLINE ||
+	    ((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
+	     !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
+	    cdev->private->flags.doverify)
+		return -EBUSY;
+	ret = cio_set_options (sch, flags);
+	if (ret)
+		return ret;
+	ret = cio_start_key (sch, cpa, lpm, key);
+	if (ret == 0)
+		cdev->private->intparm = intparm;
+	return ret;
+}
+
+
+int
+ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
+			     unsigned long intparm, __u8 lpm, __u8 key,
+			     unsigned long flags, int expires)
+{
+	int ret;
+
+	if (!cdev)
+		return -ENODEV;
+	ccw_device_set_timeout(cdev, expires);
+	ret = ccw_device_start_key(cdev, cpa, intparm, lpm, key, flags);
+	if (ret != 0)
+		ccw_device_set_timeout(cdev, 0);
+	return ret;
+}
+
+int
+ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa,
+		 unsigned long intparm, __u8 lpm, unsigned long flags)
+{
+	return ccw_device_start_key(cdev, cpa, intparm, lpm,
+				    default_storage_key, flags);
+}
+
+int
+ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa,
+			 unsigned long intparm, __u8 lpm, unsigned long flags,
+			 int expires)
+{
+	return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm,
+					    default_storage_key, flags,
+					    expires);
+}
+
+
+int
+ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
+{
+	struct subchannel *sch;
+	int ret;
+
+	if (!cdev)
+		return -ENODEV;
+	if (cdev->private->state == DEV_STATE_NOT_OPER)
+		return -ENODEV;
+	if (cdev->private->state != DEV_STATE_ONLINE &&
+	    cdev->private->state != DEV_STATE_WAIT4IO &&
+	    cdev->private->state != DEV_STATE_W4SENSE)
+		return -EINVAL;
+	sch = to_subchannel(cdev->dev.parent);
+	if (!sch)
+		return -ENODEV;
+	ret = cio_halt(sch);
+	if (ret == 0)
+		cdev->private->intparm = intparm;
+	return ret;
+}
+
+int
+ccw_device_resume(struct ccw_device *cdev)
+{
+	struct subchannel *sch;
+
+	if (!cdev)
+		return -ENODEV;
+	sch = to_subchannel(cdev->dev.parent);
+	if (!sch)
+		return -ENODEV;
+	if (cdev->private->state == DEV_STATE_NOT_OPER)
+		return -ENODEV;
+	if (cdev->private->state != DEV_STATE_ONLINE ||
+	    !(sch->schib.scsw.actl & SCSW_ACTL_SUSPENDED))
+		return -EINVAL;
+	return cio_resume(sch);
+}
+
+/*
+ * Pass interrupt to device driver.
+ */
+int
+ccw_device_call_handler(struct ccw_device *cdev)
+{
+	struct subchannel *sch;
+	unsigned int stctl;
+	int ending_status;
+
+	sch = to_subchannel(cdev->dev.parent);
+
+	/*
+	 * we allow for the device action handler if .
+	 *  - we received ending status
+	 *  - the action handler requested to see all interrupts
+	 *  - we received an intermediate status
+	 *  - fast notification was requested (primary status)
+	 *  - unsolicited interrupts
+	 */
+	stctl = cdev->private->irb.scsw.stctl;
+	ending_status = (stctl & SCSW_STCTL_SEC_STATUS) ||
+		(stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) ||
+		(stctl == SCSW_STCTL_STATUS_PEND);
+	if (!ending_status &&
+	    !cdev->private->options.repall &&
+	    !(stctl & SCSW_STCTL_INTER_STATUS) &&
+	    !(cdev->private->options.fast &&
+	      (stctl & SCSW_STCTL_PRIM_STATUS)))
+		return 0;
+
+	/*
+	 * Now we are ready to call the device driver interrupt handler.
+	 */
+	if (cdev->handler)
+		cdev->handler(cdev, cdev->private->intparm,
+			      &cdev->private->irb);
+
+	/*
+	 * Clear the old and now useless interrupt response block.
+	 */
+	memset(&cdev->private->irb, 0, sizeof(struct irb));
+
+	return 1;
+}
+
+/*
+ * Search for CIW command in extended sense data.
+ */
+struct ciw *
+ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
+{
+	int ciw_cnt;
+
+	if (cdev->private->flags.esid == 0)
+		return NULL;
+	for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
+		if (cdev->private->senseid.ciw[ciw_cnt].ct == ct)
+			return cdev->private->senseid.ciw + ciw_cnt;
+	return NULL;
+}
+
+__u8
+ccw_device_get_path_mask(struct ccw_device *cdev)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+	if (!sch)
+		return 0;
+	else
+		return sch->vpm;
+}
+
+static void
+ccw_device_wake_up(struct ccw_device *cdev, unsigned long ip, struct irb *irb)
+{
+	if (!ip)
+		/* unsolicited interrupt */
+		return;
+
+	/* Abuse intparm for error reporting. */
+	if (IS_ERR(irb))
+		cdev->private->intparm = -EIO;
+	else if ((irb->scsw.dstat !=
+		  (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
+		 (irb->scsw.cstat != 0)) {
+		/*
+		 * We didn't get channel end / device end. Check if path
+		 * verification has been started; we can retry after it has
+		 * finished. We also retry unit checks except for command reject
+		 * or intervention required.
+		 */
+		 if (cdev->private->flags.doverify ||
+			 cdev->private->state == DEV_STATE_VERIFY)
+			 cdev->private->intparm = -EAGAIN;
+		 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
+		     !(irb->ecw[0] &
+		       (SNS0_CMD_REJECT | SNS0_INTERVENTION_REQ)))
+			 cdev->private->intparm = -EAGAIN;
+		 else
+			 cdev->private->intparm = -EIO;
+			 
+	} else
+		cdev->private->intparm = 0;
+	wake_up(&cdev->private->wait_q);
+}
+
+static inline int
+__ccw_device_retry_loop(struct ccw_device *cdev, struct ccw1 *ccw, long magic, __u8 lpm)
+{
+	int ret;
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+	do {
+		ret = cio_start (sch, ccw, lpm);
+		if ((ret == -EBUSY) || (ret == -EACCES)) {
+			/* Try again later. */
+			spin_unlock_irq(&sch->lock);
+			msleep(10);
+			spin_lock_irq(&sch->lock);
+			continue;
+		}
+		if (ret != 0)
+			/* Non-retryable error. */
+			break;
+		/* Wait for end of request. */
+		cdev->private->intparm = magic;
+		spin_unlock_irq(&sch->lock);
+		wait_event(cdev->private->wait_q,
+			   (cdev->private->intparm == -EIO) ||
+			   (cdev->private->intparm == -EAGAIN) ||
+			   (cdev->private->intparm == 0));
+		spin_lock_irq(&sch->lock);
+		/* Check at least for channel end / device end */
+		if (cdev->private->intparm == -EIO) {
+			/* Non-retryable error. */
+			ret = -EIO;
+			break;
+		}
+		if (cdev->private->intparm == 0)
+			/* Success. */
+			break;
+		/* Try again later. */
+		spin_unlock_irq(&sch->lock);
+		msleep(10);
+		spin_lock_irq(&sch->lock);
+	} while (1);
+
+	return ret;
+}
+
+/**
+ * read_dev_chars() - read device characteristics
+ * @param cdev   target ccw device
+ * @param buffer pointer to buffer for rdc data
+ * @param length size of rdc data
+ * @returns 0 for success, negative error value on failure
+ *
+ * Context:
+ *   called for online device, lock not held
+ **/
+int
+read_dev_chars (struct ccw_device *cdev, void **buffer, int length)
+{
+	void (*handler)(struct ccw_device *, unsigned long, struct irb *);
+	struct subchannel *sch;
+	int ret;
+	struct ccw1 *rdc_ccw;
+
+	if (!cdev)
+		return -ENODEV;
+	if (!buffer || !length)
+		return -EINVAL;
+	sch = to_subchannel(cdev->dev.parent);
+
+	CIO_TRACE_EVENT (4, "rddevch");
+	CIO_TRACE_EVENT (4, sch->dev.bus_id);
+
+	rdc_ccw = kmalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
+	if (!rdc_ccw)
+		return -ENOMEM;
+	memset(rdc_ccw, 0, sizeof(struct ccw1));
+	rdc_ccw->cmd_code = CCW_CMD_RDC;
+	rdc_ccw->count = length;
+	rdc_ccw->flags = CCW_FLAG_SLI;
+	ret = set_normalized_cda (rdc_ccw, (*buffer));
+	if (ret != 0) {
+		kfree(rdc_ccw);
+		return ret;
+	}
+
+	spin_lock_irq(&sch->lock);
+	/* Save interrupt handler. */
+	handler = cdev->handler;
+	/* Temporarily install own handler. */
+	cdev->handler = ccw_device_wake_up;
+	if (cdev->private->state != DEV_STATE_ONLINE)
+		ret = -ENODEV;
+	else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
+		  !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
+		 cdev->private->flags.doverify)
+		ret = -EBUSY;
+	else
+		/* 0x00D9C4C3 == ebcdic "RDC" */
+		ret = __ccw_device_retry_loop(cdev, rdc_ccw, 0x00D9C4C3, 0);
+
+	/* Restore interrupt handler. */
+	cdev->handler = handler;
+	spin_unlock_irq(&sch->lock);
+
+	clear_normalized_cda (rdc_ccw);
+	kfree(rdc_ccw);
+
+	return ret;
+}
+
+/*
+ *  Read Configuration data using path mask
+ */
+int
+read_conf_data_lpm (struct ccw_device *cdev, void **buffer, int *length, __u8 lpm)
+{
+	void (*handler)(struct ccw_device *, unsigned long, struct irb *);
+	struct subchannel *sch;
+	struct ciw *ciw;
+	char *rcd_buf;
+	int ret;
+	struct ccw1 *rcd_ccw;
+
+	if (!cdev)
+		return -ENODEV;
+	if (!buffer || !length)
+		return -EINVAL;
+	sch = to_subchannel(cdev->dev.parent);
+
+	CIO_TRACE_EVENT (4, "rdconf");
+	CIO_TRACE_EVENT (4, sch->dev.bus_id);
+
+	/*
+	 * scan for RCD command in extended SenseID data
+	 */
+	ciw = ccw_device_get_ciw(cdev, CIW_TYPE_RCD);
+	if (!ciw || ciw->cmd == 0)
+		return -EOPNOTSUPP;
+
+	rcd_ccw = kmalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
+	if (!rcd_ccw)
+		return -ENOMEM;
+	memset(rcd_ccw, 0, sizeof(struct ccw1));
+	rcd_buf = kmalloc(ciw->count, GFP_KERNEL | GFP_DMA);
+ 	if (!rcd_buf) {
+		kfree(rcd_ccw);
+		return -ENOMEM;
+	}
+ 	memset (rcd_buf, 0, ciw->count);
+	rcd_ccw->cmd_code = ciw->cmd;
+	rcd_ccw->cda = (__u32) __pa (rcd_buf);
+	rcd_ccw->count = ciw->count;
+	rcd_ccw->flags = CCW_FLAG_SLI;
+
+	spin_lock_irq(&sch->lock);
+	/* Save interrupt handler. */
+	handler = cdev->handler;
+	/* Temporarily install own handler. */
+	cdev->handler = ccw_device_wake_up;
+	if (cdev->private->state != DEV_STATE_ONLINE)
+		ret = -ENODEV;
+	else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
+		  !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
+		 cdev->private->flags.doverify)
+		ret = -EBUSY;
+	else
+		/* 0x00D9C3C4 == ebcdic "RCD" */
+		ret = __ccw_device_retry_loop(cdev, rcd_ccw, 0x00D9C3C4, lpm);
+
+	/* Restore interrupt handler. */
+	cdev->handler = handler;
+	spin_unlock_irq(&sch->lock);
+
+ 	/*
+ 	 * on success we update the user input parms
+ 	 */
+ 	if (ret) {
+ 		kfree (rcd_buf);
+ 		*buffer = NULL;
+ 		*length = 0;
+ 	} else {
+		*length = ciw->count;
+		*buffer = rcd_buf;
+	}
+	kfree(rcd_ccw);
+
+	return ret;
+}
+
+/*
+ *  Read Configuration data
+ */
+int
+read_conf_data (struct ccw_device *cdev, void **buffer, int *length)
+{
+	return read_conf_data_lpm (cdev, buffer, length, 0);
+}
+
+/*
+ * Try to break the lock on a boxed device.
+ */
+int
+ccw_device_stlck(struct ccw_device *cdev)
+{
+	void *buf, *buf2;
+	unsigned long flags;
+	struct subchannel *sch;
+	int ret;
+
+	if (!cdev)
+		return -ENODEV;
+
+	if (cdev->drv && !cdev->private->options.force)
+		return -EINVAL;
+
+	sch = to_subchannel(cdev->dev.parent);
+	
+	CIO_TRACE_EVENT(2, "stl lock");
+	CIO_TRACE_EVENT(2, cdev->dev.bus_id);
+
+	buf = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+	buf2 = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
+	if (!buf2) {
+		kfree(buf);
+		return -ENOMEM;
+	}
+	spin_lock_irqsave(&sch->lock, flags);
+	ret = cio_enable_subchannel(sch, 3);
+	if (ret)
+		goto out_unlock;
+	/*
+	 * Setup ccw. We chain an unconditional reserve and a release so we
+	 * only break the lock.
+	 */
+	cdev->private->iccws[0].cmd_code = CCW_CMD_STLCK;
+	cdev->private->iccws[0].cda = (__u32) __pa(buf);
+	cdev->private->iccws[0].count = 32;
+	cdev->private->iccws[0].flags = CCW_FLAG_CC;
+	cdev->private->iccws[1].cmd_code = CCW_CMD_RELEASE;
+	cdev->private->iccws[1].cda = (__u32) __pa(buf2);
+	cdev->private->iccws[1].count = 32;
+	cdev->private->iccws[1].flags = 0;
+	ret = cio_start(sch, cdev->private->iccws, 0);
+	if (ret) {
+		cio_disable_subchannel(sch); //FIXME: return code?
+		goto out_unlock;
+	}
+	cdev->private->irb.scsw.actl |= SCSW_ACTL_START_PEND;
+	spin_unlock_irqrestore(&sch->lock, flags);
+	wait_event(cdev->private->wait_q, cdev->private->irb.scsw.actl == 0);
+	spin_lock_irqsave(&sch->lock, flags);
+	cio_disable_subchannel(sch); //FIXME: return code?
+	if ((cdev->private->irb.scsw.dstat !=
+	     (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
+	    (cdev->private->irb.scsw.cstat != 0))
+		ret = -EIO;
+	/* Clear irb. */
+	memset(&cdev->private->irb, 0, sizeof(struct irb));
+out_unlock:
+	if (buf)
+		kfree(buf);
+	if (buf2)
+		kfree(buf2);
+	spin_unlock_irqrestore(&sch->lock, flags);
+	return ret;
+}
+
+void *
+ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no)
+{
+	struct subchannel *sch;
+
+	sch = to_subchannel(cdev->dev.parent);
+	return chsc_get_chp_desc(sch, chp_no);
+}
+
+// FIXME: these have to go:
+
+int
+_ccw_device_get_subchannel_number(struct ccw_device *cdev)
+{
+	return cdev->private->irq;
+}
+
+int
+_ccw_device_get_device_number(struct ccw_device *cdev)
+{
+	return cdev->private->devno;
+}
+
+
+MODULE_LICENSE("GPL");
+EXPORT_SYMBOL(ccw_device_set_options);
+EXPORT_SYMBOL(ccw_device_clear);
+EXPORT_SYMBOL(ccw_device_halt);
+EXPORT_SYMBOL(ccw_device_resume);
+EXPORT_SYMBOL(ccw_device_start_timeout);
+EXPORT_SYMBOL(ccw_device_start);
+EXPORT_SYMBOL(ccw_device_start_timeout_key);
+EXPORT_SYMBOL(ccw_device_start_key);
+EXPORT_SYMBOL(ccw_device_get_ciw);
+EXPORT_SYMBOL(ccw_device_get_path_mask);
+EXPORT_SYMBOL(read_conf_data);
+EXPORT_SYMBOL(read_dev_chars);
+EXPORT_SYMBOL(_ccw_device_get_subchannel_number);
+EXPORT_SYMBOL(_ccw_device_get_device_number);
+EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc);
+EXPORT_SYMBOL_GPL(read_conf_data_lpm);