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authorPeter Oberparleiter <peter.oberparleiter@de.ibm.com>2008-02-05 16:50:33 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-02-05 16:50:52 +0100
commit6f52ac29712f3eec192599249b12612360948646 (patch)
tree969f70f233860c35f676d7c457dd28a39a8dde1b
parent9ef9dc69d4167276c04590d67ee55de8380bc1ad (diff)
[S390] cio: make sense id procedure work with partial hardware response
In some cases the current sense id procedure trips over incomplete hardware responses. In these cases, checking against the preset value of 0xFFFF is not enough. More critically, the VM DIAG call will always be considered to have provided data after such an incident, even if it was not successful at all. The solution is to always initialize the control unit data before doing a sense id call. Check the condition code before considering the control unit data. And initialize again, before evaluating the VM data. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--drivers/s390/cio/device_id.c107
1 files changed, 64 insertions, 43 deletions
diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c
index 918b8b89cf9..dc4d87f77f6 100644
--- a/drivers/s390/cio/device_id.c
+++ b/drivers/s390/cio/device_id.c
@@ -26,17 +26,18 @@
#include "ioasm.h"
#include "io_sch.h"
-/*
- * Input :
- * devno - device number
- * ps - pointer to sense ID data area
- * Output : none
+/**
+ * vm_vdev_to_cu_type - Convert vm virtual device into control unit type
+ * for certain devices.
+ * @class: virtual device class
+ * @type: virtual device type
+ *
+ * Returns control unit type if a match was made or %0xffff otherwise.
*/
-static void
-VM_virtual_device_info (__u16 devno, struct senseid *ps)
+static int vm_vdev_to_cu_type(int class, int type)
{
static struct {
- int vrdcvcla, vrdcvtyp, cu_type;
+ int class, type, cu_type;
} vm_devices[] = {
{ 0x08, 0x01, 0x3480 },
{ 0x08, 0x02, 0x3430 },
@@ -68,8 +69,26 @@ VM_virtual_device_info (__u16 devno, struct senseid *ps)
{ 0x40, 0xc0, 0x5080 },
{ 0x80, 0x00, 0x3215 },
};
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(vm_devices); i++)
+ if (class == vm_devices[i].class && type == vm_devices[i].type)
+ return vm_devices[i].cu_type;
+
+ return 0xffff;
+}
+
+/**
+ * diag_get_dev_info - retrieve device information via DIAG X'210'
+ * @devno: device number
+ * @ps: pointer to sense ID data area
+ *
+ * Returns zero on success, non-zero otherwise.
+ */
+static int diag_get_dev_info(u16 devno, struct senseid *ps)
+{
struct diag210 diag_data;
- int ccode, i;
+ int ccode;
CIO_TRACE_EVENT (4, "VMvdinf");
@@ -79,21 +98,21 @@ VM_virtual_device_info (__u16 devno, struct senseid *ps)
};
ccode = diag210 (&diag_data);
- ps->reserved = 0xff;
+ if ((ccode == 0) || (ccode == 2)) {
+ 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 < ARRAY_SIZE(vm_devices); 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;
+ /* Special case for osa devices. */
+ if (diag_data.vrdcvcla == 0x02 && diag_data.vrdcvtyp == 0x20) {
+ ps->cu_type = 0x3088;
+ ps->cu_model = 0x60;
+ return 0;
}
+ ps->cu_type = vm_vdev_to_cu_type(diag_data.vrdcvcla,
+ diag_data.vrdcvtyp);
+ if (ps->cu_type != 0xffff)
+ return 0;
+ }
+
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, "
@@ -102,6 +121,8 @@ VM_virtual_device_info (__u16 devno, struct senseid *ps)
diag_data.vrdcvcla, diag_data.vrdcvtyp,
diag_data.vrdcrccl, diag_data.vrdccrty,
diag_data.vrdccrmd);
+
+ return -ENODEV;
}
/*
@@ -130,6 +151,7 @@ __ccw_device_sense_id_start(struct ccw_device *cdev)
/* Try on every path. */
ret = -ENODEV;
while (cdev->private->imask != 0) {
+ cdev->private->senseid.cu_type = 0xFFFF;
if ((sch->opm & cdev->private->imask) != 0 &&
cdev->private->iretry > 0) {
cdev->private->iretry--;
@@ -153,7 +175,6 @@ 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);
@@ -173,13 +194,7 @@ ccw_device_check_sense_id(struct ccw_device *cdev)
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)) {
/* Retry Sense ID if requested. */
@@ -231,6 +246,15 @@ ccw_device_check_sense_id(struct ccw_device *cdev)
sch->schid.ssid, sch->schid.sch_no);
return -EACCES;
}
+
+ /* Did we get a proper answer ? */
+ if (irb->scsw.cc == 0 && 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 */
+ }
+
/* Hmm, whatever happened, try again. */
CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on "
"subchannel 0.%x.%04x returns status %02X%02X\n",
@@ -283,20 +307,17 @@ ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event)
break;
/* fall through. */
default: /* Sense ID failed. Try asking VM. */
- if (MACHINE_IS_VM) {
- VM_virtual_device_info (cdev->private->dev_id.devno,
+ if (MACHINE_IS_VM)
+ ret = diag_get_dev_info(cdev->private->dev_id.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);
+ else
+ /*
+ * If we can't couldn't identify the device type we
+ * consider the device "not operational".
+ */
+ ret = -ENODEV;
+
+ ccw_device_sense_id_done(cdev, ret);
break;
}
}