Messages in this thread | ![/](/images/icornerl.gif) | | Date | Sat, 14 Apr 2001 12:27:41 -0400 | From | Douglas Gilbert <> | Subject | Re: [RFC][PATCH] adding PCI bus information to SCSI layer |
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Alan Cox wrote: > > > Also ISA adapters are not the only non-PCI adapters, > > there are the growing band of pseudo adapters that > > may or may not have a PCI bus at the bottom of some > > other protocol stack. > > An ioctl might be better. We already have an ioctl for querying the lun > information for a disk. We could also return the bus information for its > controller(s) [remember multipathing]
Both 'cat /proc/scsi/scsi' and ioctls used on fds belonging to the existing upper level drivers (e.g. sd and sr) have a problem as far as getting HBA environment information: there needs to be at least one SCSI device (target) connected to the HBA. With no SCSI devices connected, there is no fd to do an ioctl on. [The same problem arises if a device is there but marked offline, has an exclusive lock on it, ...]
Perhaps Matt could look at the approach I have taken with the scsimon experimental upper level driver. Scsimon was originally designed to get scsi based information to the /sbin/hotplug mechanism. It also supplies ioctls to probe HBAs as well as SCSI devices. More information about it can be found at: http://www.torque.net/scsi/scsimon.html
It should not be difficult to add HBA PCI bus information to scsimon (after the Scsi_Host structure is expanded to hold that information).
Doug Gilbert - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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