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path: root/drivers/s390/cio/device_id.c
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-rw-r--r--drivers/s390/cio/device_id.c355
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);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 22:11:58 +0000