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Message-ID: <20071114003455.GD8509@austin.ibm.com>
Date: Tue, 13 Nov 2007 18:34:55 -0600
From: linas@...tin.ibm.com (Linas Vepstas)
To: Greg KH <greg@...ah.com>, gregkh@...e.de,
Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Cc: Matthew Wilcox <matthew@....cx>, strosake@...ibm.com,
Alex Chiang <achiang@...com>, linux-kernel@...r.kernel.org,
linux-pci@...ey.karlin.mff.cuni.cz, lenb@...nel.org,
rick.jones2@...com, pcihpd-discuss@...ts.sourceforge.net,
linux-acpi@...r.kernel.org, linuxppc-dev@...abs.org
Subject: [PATCH] pci hotplug: fix rpaphp directory naming
Fix presentation of the slot number in the /sys/bus/pci/slots
directory to match that used in the majority of other drivers.
------
On Tue, Nov 13, 2007 at 02:58:30PM -0700, Matthew Wilcox wrote:
> On Tue, Nov 13, 2007 at 03:41:21PM -0600, Linas Vepstas wrote:
> > /sys/bus/pci/slots
> > /sys/bus/pci/slots/control
> > /sys/bus/pci/slots/control/remove_slot
> > /sys/bus/pci/slots/control/add_slot
> > /sys/bus/pci/slots/0001:00:02.0
> > /sys/bus/pci/slots/0001:00:02.0/phy_location
>
> Ugh. Almost two years ago, paulus promised me he was going to fix the
> slot name for rpaphp. Guess he didn't.
You have to ask the right person. :-) I've been defacto mainaining
the rpaphp code for unpteen years now. On the other hand, I am also
much, much better at promising than delivering.
> This is one of the hateful things about the current design -- hotplug
> drivers do too much. Instead of being just the interface between the
> Linux PCI code and the hardware, they create sysfs directories, add
> files,
> and generally have far too much freedom.
I chopped out several hundred LOC from rpaphp a year ago,
and hopefuly that might make furthre simplification easier
someday.
> We have four different schemes currently for naming in slots/,
> 1. slot number. Used by cpqphp, ibmphp, acpiphp, pciehp, shpc.
> 2. domain:bus:dev:fn. Used by fakephp.
> 3a. domain:bus:dev. Used by rpaphp and sgihp.
> 3b. Except that rpaphp uses phy_location to present the information
> that
> should be in the name and sgihp uses path.
>
> ... I've forgotten what cpci uses. And yenta doesn't use it.
>
> How is anyone supposed to write sane managability tools in the
> presence
> of such anarchy?
>
> > ~ # cat /sys/bus/pci/slots/0000:00:02.2/phy_location
> > U787A.001.DNZ00Z5-P1-C2
>
> Right. This should look like:
>
> # cat /sys/bus/pci/slots/U787A.001.DNZ00Z5-P1-C2/address
> 0000:00:02
This patch implements exactly what you describe. Boot tested.
I assume you really mean it -- if so, then please review and
ack the patch !?
I have absolutely no clue if this breaks any existing IBM tools.
I'm pretty sure it doesn't ... but attention Mike Strosaker! does it?
drivers/pci/hotplug/rpaphp.h | 1
drivers/pci/hotplug/rpaphp_pci.c | 14 -----------
drivers/pci/hotplug/rpaphp_slot.c | 47 +++++++++++++++++++-------------------
3 files changed, 24 insertions(+), 38 deletions(-)
Index: linux-2.6.23-rc8-mm1/drivers/pci/hotplug/rpaphp_pci.c
===================================================================
--- linux-2.6.23-rc8-mm1.orig/drivers/pci/hotplug/rpaphp_pci.c 2007-07-08 18:32:17.000000000 -0500
+++ linux-2.6.23-rc8-mm1/drivers/pci/hotplug/rpaphp_pci.c 2007-11-13 17:52:10.000000000 -0600
@@ -64,19 +64,6 @@ int rpaphp_get_sensor_state(struct slot
return rc;
}
-static void set_slot_name(struct slot *slot)
-{
- struct pci_bus *bus = slot->bus;
- struct pci_dev *bridge;
-
- bridge = bus->self;
- if (bridge)
- strcpy(slot->name, pci_name(bridge));
- else
- sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
- bus->number);
-}
-
/**
* rpaphp_enable_slot - record slot state, config pci device
*
@@ -114,7 +101,6 @@ int rpaphp_enable_slot(struct slot *slot
info->adapter_status = EMPTY;
slot->bus = bus;
slot->pci_devs = &bus->devices;
- set_slot_name(slot);
/* if there's an adapter in the slot, go add the pci devices */
if (state == PRESENT) {
Index: linux-2.6.23-rc8-mm1/drivers/pci/hotplug/rpaphp_slot.c
===================================================================
--- linux-2.6.23-rc8-mm1.orig/drivers/pci/hotplug/rpaphp_slot.c 2007-07-08 18:32:17.000000000 -0500
+++ linux-2.6.23-rc8-mm1/drivers/pci/hotplug/rpaphp_slot.c 2007-11-13 18:05:13.000000000 -0600
@@ -33,23 +33,31 @@
#include <asm/rtas.h>
#include "rpaphp.h"
-static ssize_t location_read_file (struct hotplug_slot *php_slot, char *buf)
+static ssize_t address_read_file (struct hotplug_slot *php_slot, char *buf)
{
- char *value;
- int retval = -ENOENT;
+ int retval;
struct slot *slot = (struct slot *)php_slot->private;
+ struct pci_bus *bus;
if (!slot)
- return retval;
+ return -ENOENT;
- value = slot->location;
- retval = sprintf (buf, "%s\n", value);
+ bus = slot->bus;
+ if (!bus)
+ return -ENOENT;
+
+ if (bus->self)
+ retval = sprintf(buf, pci_name(bus->self));
+ else
+ retval = sprintf(buf, "%04x:%02x:00.0",
+ pci_domain_nr(bus), bus->number);
+
return retval;
}
-static struct hotplug_slot_attribute php_attr_location = {
- .attr = {.name = "phy_location", .mode = S_IFREG | S_IRUGO},
- .show = location_read_file,
+static struct hotplug_slot_attribute php_attr_address = {
+ .attr = {.name = "address", .mode = S_IFREG | S_IRUGO},
+ .show = address_read_file,
};
/* free up the memory used by a slot */
@@ -64,7 +72,6 @@ void dealloc_slot_struct(struct slot *sl
kfree(slot->hotplug_slot->info);
kfree(slot->hotplug_slot->name);
kfree(slot->hotplug_slot);
- kfree(slot->location);
kfree(slot);
}
@@ -83,16 +90,13 @@ struct slot *alloc_slot_struct(struct de
GFP_KERNEL);
if (!slot->hotplug_slot->info)
goto error_hpslot;
- slot->hotplug_slot->name = kmalloc(BUS_ID_SIZE + 1, GFP_KERNEL);
+ slot->hotplug_slot->name = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
if (!slot->hotplug_slot->name)
goto error_info;
- slot->location = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
- if (!slot->location)
- goto error_name;
slot->name = slot->hotplug_slot->name;
+ strcpy(slot->name, drc_name);
slot->dn = dn;
slot->index = drc_index;
- strcpy(slot->location, drc_name);
slot->power_domain = power_domain;
slot->hotplug_slot->private = slot;
slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
@@ -100,8 +104,6 @@ struct slot *alloc_slot_struct(struct de
return (slot);
-error_name:
- kfree(slot->hotplug_slot->name);
error_info:
kfree(slot->hotplug_slot->info);
error_hpslot:
@@ -133,8 +135,8 @@ int rpaphp_deregister_slot(struct slot *
list_del(&slot->rpaphp_slot_list);
- /* remove "phy_location" file */
- sysfs_remove_file(&php_slot->kobj, &php_attr_location.attr);
+ /* remove "address" file */
+ sysfs_remove_file(&php_slot->kobj, &php_attr_address.attr);
retval = pci_hp_deregister(php_slot);
if (retval)
@@ -166,8 +168,8 @@ int rpaphp_register_slot(struct slot *sl
return retval;
}
- /* create "phy_location" file */
- retval = sysfs_create_file(&php_slot->kobj, &php_attr_location.attr);
+ /* create "address" file */
+ retval = sysfs_create_file(&php_slot->kobj, &php_attr_address.attr);
if (retval) {
err("sysfs_create_file failed with error %d\n", retval);
goto sysfs_fail;
@@ -175,8 +177,7 @@ int rpaphp_register_slot(struct slot *sl
/* add slot to our internal list */
list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
- info("Slot [%s](PCI location=%s) registered\n", slot->name,
- slot->location);
+ info("Slot [%s] registered\n", slot->name);
return 0;
sysfs_fail:
Index: linux-2.6.23-rc8-mm1/drivers/pci/hotplug/rpaphp.h
===================================================================
--- linux-2.6.23-rc8-mm1.orig/drivers/pci/hotplug/rpaphp.h 2007-07-08 18:32:17.000000000 -0500
+++ linux-2.6.23-rc8-mm1/drivers/pci/hotplug/rpaphp.h 2007-11-13 18:06:16.000000000 -0600
@@ -74,7 +74,6 @@ struct slot {
u32 type;
u32 power_domain;
char *name;
- char *location;
struct device_node *dn;
struct pci_bus *bus;
struct list_head *pci_devs;
-
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