Linux-2.6.12-rc2v2.6.12-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, 355 insertions, 0 deletions

diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c
new file mode 100644
index 00000000000..0e68fb511dc
--- /dev/null
+++ b/drivers/s390/cio/device_id.c
@@ -0,0 +1,355 @@
+/*
+ * drivers/s390/cio/device_id.c
+ *
+ *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
+ *			 IBM Corporation
+ *    Author(s): Cornelia Huck(cohuck@de.ibm.com)
+ *		 Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * Sense ID functions.
+ */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/init.h>
+
+#include <asm/ccwdev.h>
+#include <asm/delay.h>
+#include <asm/cio.h>
+#include <asm/lowcore.h>
+
+#include "cio.h"
+#include "cio_debug.h"
+#include "css.h"
+#include "device.h"
+#include "ioasm.h"
+
+/*
+ * diag210 is used under VM to get information about a virtual device
+ */
+#ifdef CONFIG_ARCH_S390X
+int
+diag210(struct diag210 * addr)
+{
+	/*
+	 * diag 210 needs its data below the 2GB border, so we
+	 * use a static data area to be sure
+	 */
+	static struct diag210 diag210_tmp;
+	static DEFINE_SPINLOCK(diag210_lock);
+	unsigned long flags;
+	int ccode;
+
+	spin_lock_irqsave(&diag210_lock, flags);
+	diag210_tmp = *addr;
+
+	asm volatile (
+		"   lhi	  %0,-1\n"
+		"   sam31\n"
+		"   diag  %1,0,0x210\n"
+		"0: ipm	  %0\n"
+		"   srl	  %0,28\n"
+		"1: sam64\n"
+		".section __ex_table,\"a\"\n"
+		"    .align 8\n"
+		"    .quad 0b,1b\n"
+		".previous"
+		: "=&d" (ccode) : "a" (__pa(&diag210_tmp)) : "cc", "memory" );
+
+	*addr = diag210_tmp;
+	spin_unlock_irqrestore(&diag210_lock, flags);
+
+	return ccode;
+}
+#else
+int
+diag210(struct diag210 * addr)
+{
+	int ccode;
+
+	asm volatile (
+		"   lhi	  %0,-1\n"
+		"   diag  %1,0,0x210\n"
+		"0: ipm	  %0\n"
+		"   srl	  %0,28\n"
+		"1:\n"
+		".section __ex_table,\"a\"\n"
+		"    .align 4\n"
+		"    .long 0b,1b\n"
+		".previous"
+		: "=&d" (ccode) : "a" (__pa(addr)) : "cc", "memory" );
+
+	return ccode;
+}
+#endif
+
+/*
+ * Input :
+ *   devno - device number
+ *   ps	   - pointer to sense ID data area
+ * Output : none
+ */
+static void
+VM_virtual_device_info (__u16 devno, struct senseid *ps)
+{
+	static struct {
+		int vrdcvcla, vrdcvtyp, cu_type;
+	} vm_devices[] = {
+		{ 0x08, 0x01, 0x3480 },
+		{ 0x08, 0x02, 0x3430 },
+		{ 0x08, 0x10, 0x3420 },
+		{ 0x08, 0x42, 0x3424 },
+		{ 0x08, 0x44, 0x9348 },
+		{ 0x08, 0x81, 0x3490 },
+		{ 0x08, 0x82, 0x3422 },
+		{ 0x10, 0x41, 0x1403 },
+		{ 0x10, 0x42, 0x3211 },
+		{ 0x10, 0x43, 0x3203 },
+		{ 0x10, 0x45, 0x3800 },
+		{ 0x10, 0x47, 0x3262 },
+		{ 0x10, 0x48, 0x3820 },
+		{ 0x10, 0x49, 0x3800 },
+		{ 0x10, 0x4a, 0x4245 },
+		{ 0x10, 0x4b, 0x4248 },
+		{ 0x10, 0x4d, 0x3800 },
+		{ 0x10, 0x4e, 0x3820 },
+		{ 0x10, 0x4f, 0x3820 },
+		{ 0x10, 0x82, 0x2540 },
+		{ 0x10, 0x84, 0x3525 },
+		{ 0x20, 0x81, 0x2501 },
+		{ 0x20, 0x82, 0x2540 },
+		{ 0x20, 0x84, 0x3505 },
+		{ 0x40, 0x01, 0x3278 },
+		{ 0x40, 0x04, 0x3277 },
+		{ 0x40, 0x80, 0x2250 },
+		{ 0x40, 0xc0, 0x5080 },
+		{ 0x80, 0x00, 0x3215 },
+	};
+	struct diag210 diag_data;
+	int ccode, i;
+
+	CIO_TRACE_EVENT (4, "VMvdinf");
+
+	diag_data = (struct diag210) {
+		.vrdcdvno = devno,
+		.vrdclen = sizeof (diag_data),
+	};
+
+	ccode = diag210 (&diag_data);
+	ps->reserved = 0xff;
+
+	/* Special case for bloody osa devices. */
+	if (diag_data.vrdcvcla == 0x02 &&
+	    diag_data.vrdcvtyp == 0x20) {
+		ps->cu_type = 0x3088;
+		ps->cu_model = 0x60;
+		return;
+	}
+	for (i = 0; i < sizeof(vm_devices) / sizeof(vm_devices[0]); i++)
+		if (diag_data.vrdcvcla == vm_devices[i].vrdcvcla &&
+		    diag_data.vrdcvtyp == vm_devices[i].vrdcvtyp) {
+			ps->cu_type = vm_devices[i].cu_type;
+			return;
+		}
+	CIO_MSG_EVENT(0, "DIAG X'210' for device %04X returned (cc = %d):"
+		      "vdev class : %02X, vdev type : %04X \n ...  "
+		      "rdev class : %02X, rdev type : %04X, "
+		      "rdev model: %02X\n",
+		      devno, ccode,
+		      diag_data.vrdcvcla, diag_data.vrdcvtyp,
+		      diag_data.vrdcrccl, diag_data.vrdccrty,
+		      diag_data.vrdccrmd);
+}
+
+/*
+ * Start Sense ID helper function.
+ * Try to obtain the 'control unit'/'device type' information
+ *  associated with the subchannel.
+ */
+static int
+__ccw_device_sense_id_start(struct ccw_device *cdev)
+{
+	struct subchannel *sch;
+	struct ccw1 *ccw;
+	int ret;
+
+	sch = to_subchannel(cdev->dev.parent);
+	/* Setup sense channel program. */
+	ccw = cdev->private->iccws;
+	if (sch->schib.pmcw.pim != 0x80) {
+		/* more than one path installed. */
+		ccw->cmd_code = CCW_CMD_SUSPEND_RECONN;
+		ccw->cda = 0;
+		ccw->count = 0;
+		ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC;
+		ccw++;
+	}
+	ccw->cmd_code = CCW_CMD_SENSE_ID;
+	ccw->cda = (__u32) __pa (&cdev->private->senseid);
+	ccw->count = sizeof (struct senseid);
+	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) {
+		if ((sch->opm & cdev->private->imask) != 0 &&
+		    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;
+		}
+		cdev->private->imask >>= 1;
+		cdev->private->iretry = 5;
+	}
+	return ret;
+}
+
+void
+ccw_device_sense_id_start(struct ccw_device *cdev)
+{
+	int ret;
+
+	memset (&cdev->private->senseid, 0, sizeof (struct senseid));
+	cdev->private->senseid.cu_type = 0xFFFF;
+	cdev->private->imask = 0x80;
+	cdev->private->iretry = 5;
+	ret = __ccw_device_sense_id_start(cdev);
+	if (ret && ret != -EBUSY)
+		ccw_device_sense_id_done(cdev, ret);
+}
+
+/*
+ * Called from interrupt context to check if a valid answer
+ * to Sense ID was received.
+ */
+static int
+ccw_device_check_sense_id(struct ccw_device *cdev)
+{
+	struct subchannel *sch;
+	struct irb *irb;
+
+	sch = to_subchannel(cdev->dev.parent);
+	irb = &cdev->private->irb;
+	/* Did we get a proper answer ? */
+	if (cdev->private->senseid.cu_type != 0xFFFF && 
+	    cdev->private->senseid.reserved == 0xFF) {
+		if (irb->scsw.count < sizeof (struct senseid) - 8)
+			cdev->private->flags.esid = 1;
+		return 0; /* Success */
+	}
+	/* Check the error cases. */
+	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)) {
+		/*
+		 * if the device doesn't support the SenseID
+		 *  command further retries wouldn't help ...
+		 * NB: We don't check here for intervention required like we
+		 *     did before, because tape devices with no tape inserted
+		 *     may present this status *in conjunction with* the
+		 *     sense id information. So, for intervention required,
+		 *     we use the "whack it until it talks" strategy...
+		 */
+		CIO_MSG_EVENT(2, "SenseID : device %04x on Subchannel %04x "
+			      "reports cmd reject\n",
+			      cdev->private->devno, sch->irq);
+		return -EOPNOTSUPP;
+	}
+	if (irb->esw.esw0.erw.cons) {
+		CIO_MSG_EVENT(2, "SenseID : UC on dev %04x, "
+			      "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) {
+		if ((sch->orb.lpm &
+		     sch->schib.pmcw.pim & sch->schib.pmcw.pam) != 0)
+			CIO_MSG_EVENT(2, "SenseID : path %02X for device %04x on"
+				      " subchannel %04x is 'not operational'\n",
+				      sch->orb.lpm, cdev->private->devno,
+				      sch->irq);
+		return -EACCES;
+	}
+	/* Hmm, whatever happened, try again. */
+	CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on "
+		      "subchannel %04x returns status %02X%02X\n",
+		      cdev->private->devno, sch->irq,
+		      irb->scsw.dstat, irb->scsw.cstat);
+	return -EAGAIN;
+}
+
+/*
+ * Got interrupt for Sense ID.
+ */
+void
+ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event)
+{
+	struct subchannel *sch;
+	struct irb *irb;
+	int ret;
+
+	sch = to_subchannel(cdev->dev.parent);
+	irb = (struct irb *) __LC_IRB;
+	/* Retry sense id, if needed. */
+	if (irb->scsw.stctl ==
+	    (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
+		if ((irb->scsw.cc == 1) || !irb->scsw.actl) {
+			ret = __ccw_device_sense_id_start(cdev);
+			if (ret && ret != -EBUSY)
+				ccw_device_sense_id_done(cdev, ret);
+		}
+		return;
+	}
+	if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
+		return;
+	ret = ccw_device_check_sense_id(cdev);
+	memset(&cdev->private->irb, 0, sizeof(struct irb));
+	switch (ret) {
+	/* 0, -ETIME, -EOPNOTSUPP, -EAGAIN or -EACCES */
+	case 0:			/* Sense id succeeded. */
+	case -ETIME:		/* Sense id stopped by timeout. */
+		ccw_device_sense_id_done(cdev, ret);
+		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_id_start(cdev);
+		if (ret == 0 || ret == -EBUSY)
+			break;
+		/* fall through. */
+	default:		/* Sense ID failed. Try asking VM. */
+		if (MACHINE_IS_VM) {
+			VM_virtual_device_info (cdev->private->devno,
+						&cdev->private->senseid);
+			if (cdev->private->senseid.cu_type != 0xFFFF) {
+				/* Got the device information from VM. */
+				ccw_device_sense_id_done(cdev, 0);
+				return;
+			}
+		}
+		/*
+		 * If we can't couldn't identify the device type we
+		 *  consider the device "not operational".
+		 */
+		ccw_device_sense_id_done(cdev, -ENODEV);
+		break;
+	}
+}
+
+EXPORT_SYMBOL(diag210);