Hello, Cliff.
Cliff Wickman wrote:
> I've run into a problem with the ATA SCSI disk driver when running in a
> kdump dump-capture kernel.
>
> I'm running on 2-processor x86_64 box. It has 2 scsi disks, /dev/sda and
> /dev/sdb
>
> My kernel is 2.6.22, and built to be a dump capturing kernel loaded by kexec.
> When I boot this kernel by itself, it finds both sda and sdb.
>
> But when it is loaded by kexec and booted on a panic it only finds sda.
>
> Any ideas from those familiar with the ATA driver?
>
>
> -Cliff Wickman
> SGI
>
>
> I put some printk's into it and get this:
>
> Standalone:
>
> [nv_adma_error_handler]
> cpw: ata_host_register probe port 1 (error_handler:ffffffff81348625)
> cpw: ata_host_register call ata_port_probe
> cpw: ata_host_register call ata_port_schedule
> cpw: ata_host_register call ata_port_wait_eh
> cpw: ata_port_wait_eh entered
> cpw: ata_port_wait_eh, preparing to wait
> ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> cpw: ata_dev_configure entered
> cpw: ata_dev_configure testing class
> cpw: ata_dev_configure class is ATA_DEV_ATA
> ata2.00: ATA-6: ST3200822AS, 3.01, max UDMA/133
> ata2.00: 390721968 sectors, multi 16: LBA48
> cpw: ata_dev_configure exiting
> cpw: ata_dev_configure entered
> cpw: ata_dev_configure testing class
> cpw: ata_dev_configure class is ATA_DEV_ATA
> cpw: ata_dev_configure exiting
> cpw: ata_dev_set_mode printing:
> ata2.00: configured for UDMA/133
> cpw: ata_port_wait_eh, finished wait
> cpw: ata_port_wait_eh exiting
> cpw: ata_host_register done with probe port 1
>
>
> When loaded with kexec and booted on a panic:
>
> cpw: ata_host_register probe port 1 (error_handler:ffffffff81348625)
> cpw: ata_host_register call ata_port_probe
> cpw: ata_host_register call ata_port_schedule
> cpw: ata_host_register call ata_port_wait_eh
> cpw: ata_port_wait_eh entered
> cpw: ata_port_wait_eh, preparing to wait
> ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> cpw: ata_port_wait_eh, finished wait
> cpw: ata_port_wait_eh exiting
> cpw: ata_host_register done with probe port 1
Hmmm.. PHY is up but for some reason libata thought there was no device
there. Can you try the attached patch and report the result?
--
tejun
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 6001aae..4bc042d 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -732,6 +732,9 @@ ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
if (r_err)
*r_err = err;
+ ata_port_printk(ap, KERN_ERR, "XXX: try_classif dev%d e=%02x %02x:%02x:%02x\n",
+ device, err, tf.lbal, tf.lbam, tf.lbah);
+
/* see if device passed diags: if master then continue and warn later */
if (err == 0 && device == 0)
/* diagnostic fail : do nothing _YET_ */
@@ -3006,8 +3009,10 @@ int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
if (!(status & ATA_BUSY))
return 0;
- if (!ata_port_online(ap) && status == 0xff)
+ if (!ata_port_online(ap) && status == 0xff) {
+ ata_port_printk(ap, KERN_ERR, "XXX: wait_ready status=0xff\n");
return -ENODEV;
+ }
if (time_after(now, deadline))
return -EBUSY;
@@ -3037,8 +3042,10 @@ static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
if (dev0) {
rc = ata_wait_ready(ap, deadline);
if (rc) {
- if (rc != -ENODEV)
+ if (rc != -ENODEV) {
+ ata_port_printk(ap, KERN_ERR, "XXX: post_reset dev0 rc=%d\n", rc);
return rc;
+ }
ret = rc;
}
}
@@ -3067,8 +3074,10 @@ static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
rc = ata_wait_ready(ap, deadline);
if (rc) {
- if (rc != -ENODEV)
+ if (rc != -ENODEV) {
+ printk("XXX: post_reset dev1 rc=%d\n", rc);
return rc;
+ }
ret = rc;
}
}
@@ -3113,8 +3122,11 @@ static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
* the bus shows 0xFF because the odd clown forgets the D7
* pulldown resistor.
*/
- if (ata_check_status(ap) == 0xFF)
+ if (ata_check_status(ap) == 0xFF) {
+ ata_port_printk(ap, KERN_ERR, "XXX: status=0xFF altstatus=0x%x\n",
+ ata_altstatus(ap));
return -ENODEV;
+ }
return ata_bus_post_reset(ap, devmask, deadline);
}
@@ -3402,6 +3414,8 @@ int ata_std_softreset(struct ata_port *ap, unsigned int *classes,
if (slave_possible && ata_devchk(ap, 1))
devmask |= (1 << 1);
+ ata_port_printk(ap, KERN_ERR, "XXX: devmask=0x%x\n", devmask);
+
/* select device 0 again */
ap->ops->dev_select(ap, 0);
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