linux-kernel - Re: [PATCH 2.6.21-rc1] ibmebus: Support dynamic addition and removal of adapters

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Message-Id: <1171569457.20758.76.camel@sinatra.austin.ibm.com>
Date:	Thu, 15 Feb 2007 13:57:37 -0600
From:	John Rose <johnrose@...tin.ibm.com>
To:	Hoang-Nam Nguyen <hnguyen@...ux.vnet.ibm.com>
Cc:	Paul Mackerras <paulus@...ba.org>,
	External List <linuxppc-dev@...abs.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Me Notes <johnrose@...ibm.com>, fenkes@...ibm.com,
	Paul Mackerras <pmac@....ibm.com>
Subject: Re: [PATCH 2.6.21-rc1] ibmebus: Support dynamic addition and
	removal of adapters

Hi-

Looks good.  Questions: how can the user space tools verify the success
of an add or remove?  

Also, will /sys/bus/ibmebus exist even if the system booted with no LHEA
nodes?

One more comment below.

@@ -161,7 +161,9 @@ static void __devinit ibmebus_dev_releas
 static ssize_t ibmebusdev_show_name(struct device *dev, 
 				    struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%s\n", to_ibmebus_dev(dev)->name);
+	struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
+	char *name = (char*)get_property(ebus_dev->ofdev.node, "name", NULL);
+	return sprintf(buf, "%s\n", name);
 }
 static DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, ibmebusdev_show_name, 
 		   NULL);


Can we also have an attribute "devspec" that communicates the open
firmware path through sysfs?  User space DLPAR tools need a way to make
this correlation.  This is consistent with other dynamic-capable sysfs
objects (cpus, etc).  I assume you could get this string with something
like ebus_dev->ofdev.node->full_name.  For example:

# cat /sys/bus/ibmebus/$ebus_device/devspec
/lhea@...xxxxxx/

Thanks-
John

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