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SubjectPATCH 2.4.0.10: Update hotplug
Note - this is just an RFC patch, do not apply.  It compiles, but is not
tested.

Attached is a patch against 2.4.0-test10 which updates the kernel's
hotplug capabilities per recent discussions (both public and private).

Major changes:
* pci: Execute /sbin/hotplug for each hotplug device insertion or
removal
* net: Export network device hardware info to userspace as
/proc/net/if/$IF/businfo
* net: Execute /sbin/network for each net device register/unregister

Minor changes:
* kbuild: CONFIG_HOTPLUG now requires CONFIG_KMOD
* epic100: demonstration of how a net device exports its bus info
* procfs: add standard method of exporting bus info to userspace.
Currently ISA, PCI, and SBUS are supported.
* pci: support businfo
* sparc: support businfo
* usb: update /sbin/hotplug execution to pass event type (verb) as
standardized cmd line arg

DaveM - netdevice.h seems like the best place to include businfo.h.
Since it doesn't include anything but linux/types.h, that should
eliminate any worry about a nightmare of nested includes...

Note - the patch to include/linux/pci.h will go away, that is a remnant
of an earlier change. But it is included as you may need it to compile.

--
Jeff Garzik | "Mind if I drive?" -Sam
Building 1024 | "Not if you don't mind me clawing at the
MandrakeSoft | dash and shrieking like a cheerleader."
| -MaxIndex: linux_2_4/Documentation/00-INDEX
diff -u linux_2_4/Documentation/00-INDEX:1.1.1.1 linux_2_4/Documentation/00-INDEX:1.1.1.1.34.1
--- linux_2_4/Documentation/00-INDEX:1.1.1.1 Sun Oct 22 12:47:49 2000
+++ linux_2_4/Documentation/00-INDEX Wed Nov 1 22:50:19 2000
@@ -53,6 +53,8 @@
- notes about the floppy tape device driver
hayes-esp.txt
- info on using the Hayes ESP serial driver.
+hotplug.txt
+ - kernel hotplug support
i386/
- directory with info about Linux on the intel ix86 architecture.
ide.txt
Index: linux_2_4/Documentation/hotplug.txt
diff -u /dev/null linux_2_4/Documentation/hotplug.txt:1.1.2.1
--- /dev/null Wed Nov 1 23:27:35 2000
+++ linux_2_4/Documentation/hotplug.txt Wed Nov 1 22:50:19 2000
@@ -0,0 +1,111 @@
+
+Hot-Plug Devices, the Kernel, and You!
+
+
+Introduction
+============
+Kernel version 2.4.0 and later includes native support for hotpluggable
+devices. This text documents that support.
+
+FIXME: turn this random collection of notes into a real document
+
+Supported hot-plug buses: CardBus (in the PCI subsystem), USB.
+
+Hot-plug code is conditionally included when CONFIG_HOTPLUG is enabled
+in 'make config'. CONFIG_HOTPLUG now requires CONFIG_KMOD, so it is
+automatically defined when CONFIG_HOTPLUG is enabled.
+
+
+/sbin/network
+=============
+When network devices (interfaces) are added or removed, /sbin/network
+is executed by the kernel. The usage of /sbin/network is as follows:
+
+ /sbin/network [netdev-event] [interface]
+
+[netdev-event] - any one of the follow one-word ASCII strings:
+
+ register - New device [interface] was just added
+ unregister - Device [interface] was just removed
+
+/sbin/network is executed by the kernel when all such events occur --
+after bootup. Register and un-register events which occur during
+bootup, including initcalls, do not cause /sbin/network to be executed.
+
+The return value of /sbin/network is ignored by the kernel, and the
+file does not have to exist. No errors or warnings will be issued
+by the kernel is /sbin/network execution fails in any way.
+
+
+/sbin/hotplug
+=============
+When hotpluggable hardware devices are added or removed, /sbin/hotplug
+is executed by the kernel. The usage of /sbin/hotplug is as follows:
+
+ /sbin/hotplug [bus] [event]
+
+[bus] - The bus on which the hotpluggable event occurred. Supported
+bus types are:
+
+ usb - USB
+ pci - PCI-compatible hot-plug: CardBus
+
+[event] - Type of hot-plug event
+
+ add - Device insertion
+ del - Device removal
+
+In addition to the standard arguments passed to /sbin/hotplug as
+described above, each bus has its own set of environment variables
+which are passed to the program.
+
+hotplug pci env vars
+--------------------
+HOME=/
+ Hardcoded value.
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+ Hardcoded value.
+PCI_ID=$VENDOR:$DEVICE
+ $VENDOR - 16-bit PCI device vendor id, in hexidecimal
+ $DEVICE - 16-bit PCI device id, in hexidecimal
+PCI_SUBSYS_ID=$VENDOR:$DEVICE
+ $VENDOR - 16-bit PCI device subsystem vendor id, in hexidecimal
+ $DEVICE - 16-bit PCI device subsystem device id, in hexidecimal
+PCI_BUS_ID=$BUS:$SLOT:$FUNC
+ $BUS - PCI bus number, in decimal
+ $SLOT - PCI device slot, decoded from devfn, in decimal
+ $FUNC - PCI device function, decoded from devfn, in decimal
+
+
+hotplug usb env vars
+--------------------
+HOME=/
+ Hardcoded value.
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+ Hardcoded value.
+DEBUG=kernel
+ Hardcoded value. Only present if USB is in debug mode
+DEVFS=/proc/bus/usb
+ Hardcoded value. Only present if CONFIG_USB_DEVICEFS is set.
+DEVICE=/proc/bus/usb/$BUS/$DEVICE
+ Indicates the assigned USB device node for the USB device.
+ Only present if CONFIG_USB_DEVICEFS is set.
+ $BUS - USB bus number
+ $DEVICE - USB device number
+PRODUCT=$VENDOR/$PRODUCT/$DEVICE
+ USB device identification info.
+ $VENDOR - USB vendor id, in hexadecimal
+ $PRODUCT- USB product ID, in hexadecimal
+ $DEVICE - Binary-coded decimal device number
+TYPE=$CLASS/$SUB/$PROTO
+ Only present if device class is non-zero.
+ $CLASS - USB device class.
+ $SUB - USB device sub-class.
+ $PROTO - USB device protocol number.
+INTERFACE=$CLASS/$SUB/$PROTO
+ Only present if device class is zero.
+ Only the first interface (interface 0) is presented.
+ $CLASS - USB interface 0 class.
+ $SUB - USB interface 0 sub-class.
+ $PROTO - USB interface 0 protocol number.
+
Index: linux_2_4/Documentation/networking/00-INDEX
diff -u linux_2_4/Documentation/networking/00-INDEX:1.1.1.1 linux_2_4/Documentation/networking/00-INDEX:1.1.1.1.34.1
--- linux_2_4/Documentation/networking/00-INDEX:1.1.1.1 Sun Oct 22 12:48:03 2000
+++ linux_2_4/Documentation/networking/00-INDEX Wed Nov 1 23:04:19 2000
@@ -58,6 +58,8 @@
- info and "insmod" parameters for all network driver modules.
policy-routing.txt
- IP policy-based routing
+proc-net-if.txt
+ - Description of /proc/net/if/* contents
pt.txt
- the Gracilis Packetwin AX.25 device driver
routing.txt
Index: linux_2_4/Documentation/networking/proc-net-if.txt
diff -u /dev/null linux_2_4/Documentation/networking/proc-net-if.txt:1.1.2.1
--- /dev/null Wed Nov 1 23:27:36 2000
+++ linux_2_4/Documentation/networking/proc-net-if.txt Wed Nov 1 23:04:19 2000
@@ -0,0 +1,20 @@
+Contents of /proc/net/if/*:
+
+/proc/net/if is a container for per-interface procfs information.
+Each interface has its own directory, which contains the following
+pseudo-files:
+
+businfo
+ - Outputs a bus-specific string describing the hardware device
+ which owns this network interface. Zero bytes are output if
+ no hardware info is associated with the network device.
+
+Examples:
+
+ $ cat /proc/net/if/eth0/businfo
+ PCI bus 0 devfn 0
+ $
+
+ $ cat /proc/net/if/lo/businfo
+ $
+
Index: linux_2_4/arch/alpha/config.in
diff -u linux_2_4/arch/alpha/config.in:1.1.1.7 linux_2_4/arch/alpha/config.in:1.1.1.7.10.1
--- linux_2_4/arch/alpha/config.in:1.1.1.7 Sun Oct 22 16:26:26 2000
+++ linux_2_4/arch/alpha/config.in Wed Nov 1 22:50:19 2000
@@ -222,6 +222,9 @@

if [ "$CONFIG_HOTPLUG" = "y" ] ; then
source drivers/pcmcia/Config.in
+ if [ "$CONFIG_KMOD" != "y" ] ; then
+ define_bool CONFIG_KMOD y
+ fi
else
define_bool CONFIG_PCMCIA n
fi
Index: linux_2_4/arch/arm/config.in
diff -u linux_2_4/arch/arm/config.in:1.1.1.8 linux_2_4/arch/arm/config.in:1.1.1.8.16.1
--- linux_2_4/arch/arm/config.in:1.1.1.8 Sun Oct 22 15:34:31 2000
+++ linux_2_4/arch/arm/config.in Wed Nov 1 22:50:19 2000
@@ -242,6 +242,9 @@
bool 'Support hot-pluggable devices' CONFIG_HOTPLUG
if [ "$CONFIG_HOTPLUG" = "y" ]; then
source drivers/pcmcia/Config.in
+ if [ "$CONFIG_KMOD" != "y" ] ; then
+ define_bool CONFIG_KMOD y
+ fi
else
define_bool CONFIG_PCMCIA n
fi
Index: linux_2_4/arch/i386/config.in
diff -u linux_2_4/arch/i386/config.in:1.1.1.7 linux_2_4/arch/i386/config.in:1.1.1.7.10.2
--- linux_2_4/arch/i386/config.in:1.1.1.7 Sun Oct 22 16:26:14 2000
+++ linux_2_4/arch/i386/config.in Wed Nov 1 22:50:19 2000
@@ -202,6 +202,9 @@

if [ "$CONFIG_HOTPLUG" = "y" ] ; then
source drivers/pcmcia/Config.in
+ if [ "$CONFIG_KMOD" != "y" ] ; then
+ define_bool CONFIG_KMOD y
+ fi
else
define_bool CONFIG_PCMCIA n
fi
Index: linux_2_4/arch/ia64/config.in
diff -u linux_2_4/arch/ia64/config.in:1.1.1.8 linux_2_4/arch/ia64/config.in:1.1.1.8.14.1
--- linux_2_4/arch/ia64/config.in:1.1.1.8 Sun Oct 22 15:53:47 2000
+++ linux_2_4/arch/ia64/config.in Wed Nov 1 22:50:19 2000
@@ -98,6 +98,9 @@
bool 'Support for hot-pluggable devices' CONFIG_HOTPLUG
if [ "$CONFIG_HOTPLUG" = "y" ]; then
source drivers/pcmcia/Config.in
+ if [ "$CONFIG_KMOD" != "y" ] ; then
+ define_bool CONFIG_KMOD y
+ fi
else
define_bool CONFIG_PCMCIA n
fi
Index: linux_2_4/arch/mips/config.in
diff -u linux_2_4/arch/mips/config.in:1.1.1.7 linux_2_4/arch/mips/config.in:1.1.1.7.18.1
--- linux_2_4/arch/mips/config.in:1.1.1.7 Sun Oct 22 15:03:27 2000
+++ linux_2_4/arch/mips/config.in Wed Nov 1 22:50:19 2000
@@ -181,6 +181,9 @@

if [ "$CONFIG_HOTPLUG" = "y" ] ; then
source drivers/pcmcia/Config.in
+ if [ "$CONFIG_KMOD" != "y" ] ; then
+ define_bool CONFIG_KMOD y
+ fi
else
define_bool CONFIG_PCMCIA n
fi
Index: linux_2_4/arch/mips64/config.in
diff -u linux_2_4/arch/mips64/config.in:1.1.1.7 linux_2_4/arch/mips64/config.in:1.1.1.7.18.1
--- linux_2_4/arch/mips64/config.in:1.1.1.7 Sun Oct 22 15:04:47 2000
+++ linux_2_4/arch/mips64/config.in Wed Nov 1 22:50:19 2000
@@ -93,6 +93,9 @@

if [ "$CONFIG_HOTPLUG" = "y" ] ; then
source drivers/pcmcia/Config.in
+ if [ "$CONFIG_KMOD" != "y" ] ; then
+ define_bool CONFIG_KMOD y
+ fi
else
define_bool CONFIG_PCMCIA n
fi
Index: linux_2_4/arch/ppc/config.in
diff -u linux_2_4/arch/ppc/config.in:1.1.1.8 linux_2_4/arch/ppc/config.in:1.1.1.8.10.1
--- linux_2_4/arch/ppc/config.in:1.1.1.8 Sun Oct 22 16:26:54 2000
+++ linux_2_4/arch/ppc/config.in Wed Nov 1 22:50:19 2000
@@ -132,6 +132,9 @@

if [ "$CONFIG_HOTPLUG" = "y" ]; then
source drivers/pcmcia/Config.in
+ if [ "$CONFIG_KMOD" != "y" ] ; then
+ define_bool CONFIG_KMOD y
+ fi
else
define_bool CONFIG_PCMCIA n
fi
Index: linux_2_4/arch/sh/config.in
diff -u linux_2_4/arch/sh/config.in:1.1.1.7 linux_2_4/arch/sh/config.in:1.1.1.7.18.1
--- linux_2_4/arch/sh/config.in:1.1.1.7 Sun Oct 22 15:04:35 2000
+++ linux_2_4/arch/sh/config.in Wed Nov 1 22:50:19 2000
@@ -100,6 +100,9 @@

if [ "$CONFIG_HOTPLUG" = "y" ] ; then
source drivers/pcmcia/Config.in
+ if [ "$CONFIG_KMOD" != "y" ] ; then
+ define_bool CONFIG_KMOD y
+ fi
else
define_bool CONFIG_PCMCIA n
fi
Index: linux_2_4/drivers/net/epic100.c
diff -u linux_2_4/drivers/net/epic100.c:1.1.1.6 linux_2_4/drivers/net/epic100.c:1.1.1.6.18.2
--- linux_2_4/drivers/net/epic100.c:1.1.1.6 Sun Oct 22 14:55:54 2000
+++ linux_2_4/drivers/net/epic100.c Wed Nov 1 22:50:19 2000
@@ -491,6 +491,10 @@
dev->watchdog_timeo = TX_TIMEOUT;
dev->tx_timeout = &epic_tx_timeout;

+ dev->bus_info.u.pci.pdev = pdev;
+ wmb();
+ dev->bus_info.bus_type = BUSINFO_PCI;
+
return 0;

#ifndef USE_IO_OPS
Index: linux_2_4/drivers/pci/pci.c
diff -u linux_2_4/drivers/pci/pci.c:1.1.1.6 linux_2_4/drivers/pci/pci.c:1.1.1.6.6.2
--- linux_2_4/drivers/pci/pci.c:1.1.1.6 Fri Oct 27 00:45:05 2000
+++ linux_2_4/drivers/pci/pci.c Wed Nov 1 22:50:19 2000
@@ -20,6 +20,8 @@
#include <linux/ioport.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
+#include <linux/businfo.h>
+#include <linux/kmod.h> /* for hotplug_path */

#include <asm/page.h>
#include <asm/dma.h> /* isa_dma_bridge_buggy */
@@ -343,6 +345,41 @@

#ifdef CONFIG_HOTPLUG

+static void
+run_sbin_hotplug(struct pci_dev *pdev, int insert)
+{
+ char *argv[4], *envp[6];
+ char id[32], sub_id[32], bus_id[32];
+ int i;
+
+ if (!hotplug_path[0])
+ return;
+
+ sprintf(id, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device);
+ sprintf(sub_id, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor, pdev->subsystem_device);
+ sprintf(bus_id, "PCI_BUS_ID=%d:%d:%d", pdev->bus->number,
+ PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
+
+ i = 0;
+ argv[i++] = hotplug_path;
+ argv[i++] = "pci";
+ argv[i++] = insert ? "add" : "del";
+ argv[i] = 0;
+
+ i = 0;
+ /* minimal command environment */
+ envp[i++] = "HOME=/";
+ envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+
+ /* other stuff we want to pass to /sbin/hotplug */
+ envp[i++] = id;
+ envp[i++] = sub_id;
+ envp[i++] = bus_id;
+ envp[i] = 0;
+
+ call_usermodehelper (argv [0], argv, envp);
+}
+
void
pci_insert_device(struct pci_dev *dev, struct pci_bus *bus)
{
@@ -358,9 +395,13 @@
if (drv->remove && pci_announce_device(drv, dev))
break;
}
+
+ /* notify userspace of new hotplug device */
+ run_sbin_hotplug(dev, 1);
}

-static void pci_free_resources(struct pci_dev *dev)
+static void
+pci_free_resources(struct pci_dev *dev)
{
int i;

@@ -385,6 +426,9 @@
#ifdef CONFIG_PROC_FS
pci_proc_detach_device(dev);
#endif
+
+ /* notify userspace of hotplug device removal */
+ run_sbin_hotplug(dev, 0);
}

#endif
@@ -1097,6 +1141,23 @@
}
#endif

+/*
+ * format for ASCII PCI device identifiers:
+ * PCI bus A devfn B
+ * where "A" is the PCI bus number, and "B" is the
+ * encoded slot/device-function number as found in the
+ * PCI device's devfn configuration register.
+ */
+void sprintf_pci_businfo (char *buf, struct bus_info *bi)
+{
+ if (!bi->u.pci.pdev)
+ buf[0] = 0;
+ else
+ sprintf (buf, "PCI bus %d devfn %d",
+ bi->u.pci.pdev->bus->number,
+ bi->u.pci.pdev->devfn);
+}
+
void __init pci_init(void)
{
struct pci_dev *dev;
@@ -1175,4 +1236,3 @@

EXPORT_SYMBOL(isa_dma_bridge_buggy);
EXPORT_SYMBOL(pci_pci_problems);
-
Index: linux_2_4/drivers/sbus/sbus.c
diff -u linux_2_4/drivers/sbus/sbus.c:1.1.1.1 linux_2_4/drivers/sbus/sbus.c:1.1.1.1.34.1
--- linux_2_4/drivers/sbus/sbus.c:1.1.1.1 Sun Oct 22 12:44:03 2000
+++ linux_2_4/drivers/sbus/sbus.c Wed Nov 1 22:50:19 2000
@@ -9,6 +9,7 @@
#include <linux/config.h>
#include <linux/init.h>
#include <linux/pci.h>
+#include <linux/businfo.h>

#include <asm/system.h>
#include <asm/sbus.h>
@@ -546,4 +547,23 @@
clock_probe();
}
#endif
+}
+
+
+/*
+ * format for ASCII SBUS device identifiers:
+ * SBUS bus A dev B slot C
+ * A - OBP node of SBUS
+ * B - OBP node of this device
+ * C - SBUS slot number
+ */
+void sprintf_sbus_businfo (char *buf, struct bus_info *bi)
+{
+ if (!bi->u.sbus.bus || !bi->u.sbus.dev)
+ buf[0] = 0;
+ else
+ sprintf (buf, "SBUS bus %d dev %d slot %d",
+ bi->u.sbus.bus->prom_node,
+ bi->u.sbus.dev->prom_node,
+ bi->u.sbus.dev->slot);
}

Index: linux_2_4/drivers/usb/usb.c
diff -u linux_2_4/drivers/usb/usb.c:1.1.1.12 linux_2_4/drivers/usb/usb.c:1.1.1.12.2.2
--- linux_2_4/drivers/usb/usb.c:1.1.1.12 Tue Oct 31 13:28:21 2000
+++ linux_2_4/drivers/usb/usb.c Wed Nov 1 22:54:06 2000
@@ -574,7 +574,7 @@
}


-#if defined(CONFIG_KMOD) && defined(CONFIG_HOTPLUG)
+#ifdef CONFIG_HOTPLUG

/*
* USB hotplugging invokes what /proc/sys/kernel/hotplug says
@@ -639,9 +639,9 @@
* cases, we know no other thread can recycle our address, since we must
* already have been serialized enough to prevent that.
*/
-static void call_policy (char *verb, struct usb_device *dev)
+static void call_policy (struct usb_device *dev, int insert)
{
- char *argv [3], **envp, *buf, *scratch;
+ char *argv [4], *envp[8], *buf, *scratch;
int i = 0, value;

if (!hotplug_path [0])
@@ -652,27 +652,24 @@
}
if (!current->fs->root) {
/* statically linked USB is initted rather early */
- dbg ("call_policy %s, num %d -- no FS yet", verb, dev->devnum);
+ dbg ("call_policy %s, num %d -- no FS yet",
+ insert ? "add" : "del", dev->devnum);
return;
}
if (dev->devnum < 0) {
dbg ("device already deleted ??");
return;
}
- if (!(envp = (char **) kmalloc (20 * sizeof (char *), GFP_KERNEL))) {
- dbg ("enomem");
- return;
- }
if (!(buf = kmalloc (256, GFP_KERNEL))) {
- kfree (envp);
dbg ("enomem2");
return;
}

- /* only one standardized param to hotplug command: type */
+ /* args: /sbin/hotplug [bus type] [add/del] */
argv [0] = hotplug_path;
argv [1] = "usb";
- argv [2] = 0;
+ argv [2] = insert ? "add" : "del";
+ argv [3] = 0;

/* minimal command environment */
envp [i++] = "HOME=/";
@@ -687,10 +684,6 @@
*/
scratch = buf;

- /* action: add, remove */
- envp [i++] = scratch;
- scratch += sprintf (scratch, "ACTION=%s", verb) + 1;
-
#ifdef CONFIG_USB_DEVICEFS
/* If this is available, userspace programs can directly read
* all the device descriptors we don't tell them about. Or
@@ -742,7 +735,6 @@
dbg ("kusbd: %s %s %d", argv [0], verb, dev->devnum);
value = call_usermodehelper (argv [0], argv, envp);
kfree (buf);
- kfree (envp);
if (value != 0)
dbg ("kusbd policy returned 0x%x", value);
}
@@ -750,10 +742,10 @@
#else

static inline void
-call_policy (char *verb, struct usb_device *dev)
+call_policy (struct usb_device *dev, int insert)
{ }

-#endif /* KMOD && HOTPLUG */
+#endif /* CONFIG_HOTPLUG */


/*
@@ -1520,7 +1512,7 @@
}

/* Let policy agent unload modules etc */
- call_policy ("remove", dev);
+ call_policy (dev, 0);

/* Free the device number and remove the /proc/bus/usb entry */
if (dev->devnum > 0) {
@@ -2037,7 +2029,7 @@
usb_find_drivers(dev);

/* userspace may load modules and/or configure further */
- call_policy ("add", dev);
+ call_policy (dev, 1);

return 0;
}
Index: linux_2_4/fs/proc/Makefile
diff -u linux_2_4/fs/proc/Makefile:1.1.1.1 linux_2_4/fs/proc/Makefile:1.1.1.1.34.1
--- linux_2_4/fs/proc/Makefile:1.1.1.1 Sun Oct 22 12:35:07 2000
+++ linux_2_4/fs/proc/Makefile Tue Oct 31 14:43:34 2000
@@ -9,7 +9,8 @@

O_TARGET := proc.o
O_OBJS := inode.o root.o base.o generic.o array.o \
- kmsg.o proc_tty.o proc_misc.o kcore.o
+ kmsg.o proc_tty.o proc_misc.o kcore.o \
+ businfo.o
OX_OBJS := procfs_syms.o
M_OBJS :=

Index: linux_2_4/fs/proc/businfo.c
diff -u /dev/null linux_2_4/fs/proc/businfo.c:1.1.6.2
--- /dev/null Wed Nov 1 23:28:22 2000
+++ linux_2_4/fs/proc/businfo.c Wed Nov 1 22:50:19 2000
@@ -0,0 +1,116 @@
+/*
+ * kernel/businfo.c
+ * Copyright 2000 Jeff Garzik <jgarzik@mandrakesoft.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/businfo.h>
+
+
+extern void sprintf_pci_businfo (char *buf, struct bus_info *bi);
+extern void sprintf_sbus_businfo (char *buf, struct bus_info *bi);
+
+
+#ifdef CONFIG_PROC_FS
+
+
+/* normally we put sprintf_$bus_businfo in a bus-specific module. However there
+ * is no drivers/isa, so as a special case we put the following function here.
+ */
+#ifdef CONFIG_ISA
+/*
+ * format for ASCII ISA device identifiers:
+ * ISA mem A irq B dma C port D
+ * A - An occupied 24-bit ISA memory area, in hexidecimal, or zero.
+ * B - An assigned irq number, in decimal, or zero.
+ * C - An assigned dma channel number, in decimal, or zero.
+ * D - The base of an I/O port range (as used with inb/outb),
+ * in hexidecimal, or zero.
+ */
+static void sprintf_isa_businfo (char *buf, struct bus_info *bi)
+{
+ if (!bi->u.isa.mem && !bi->u.isa.irq &&
+ !bi->u.isa.dma && !bi->u.isa.port)
+ buf[0] = 0;
+ else
+ sprintf (buf, "ISA mem %X irq %d dma %d port %X",
+ bi->u.isa.mem,
+ bi->u.isa.irq,
+ bi->u.isa.dma,
+ bi->u.isa.port);
+}
+#endif /* CONFIG_ISA */
+
+
+/* rule for userspace users: zero output is a valid return,
+ * which implies the bus info is unknown or unavailable
+ */
+int businfo_read_proc (char *buf, char **start, off_t fpos,
+ int length, int *eof, struct bus_info *bi)
+{
+ size_t len;
+
+ switch (bi->bus_type) {
+#ifdef CONFIG_ISA
+ case BUSINFO_ISA:
+ sprintf_isa_businfo (buf, bi);
+ break;
+#endif
+
+#ifdef CONFIG_PCI
+ case BUSINFO_PCI:
+ sprintf_pci_businfo (buf, bi);
+ break;
+#endif
+
+#ifdef CONFIG_SBUS
+ case BUSINFO_SBUS:
+ sprintf_sbus_businfo (buf, bi);
+ break;
+#endif
+
+ default:
+ buf[0] = 0;
+ break;
+ }
+
+ len = strlen (buf);
+
+ if (fpos >= len) {
+ *start = buf;
+ *eof = 1;
+ return 0;
+ }
+
+ *start = buf + fpos;
+ if ((len -= fpos) > length)
+ return length;
+ *eof = 1;
+ return len;
+}
+
+
+#else /* CONFIG_PROC_FS */
+
+
+int businfo_read_proc (char *buf, char **start, off_t fpos,
+ int length, int *eof, struct bus_info *bi)
+{
+ *eof = 1;
+ return 0;
+}
+
+
+#endif /* CONFIG_PROC_FS */
+
+EXPORT_SYMBOL(businfo_read_proc);
Index: linux_2_4/include/linux/businfo.h
diff -u /dev/null linux_2_4/include/linux/businfo.h:1.1.6.2
--- /dev/null Wed Nov 1 23:28:35 2000
+++ linux_2_4/include/linux/businfo.h Wed Nov 1 22:50:19 2000
@@ -0,0 +1,64 @@
+/*
+ * include/linux/businfo.h
+ * Copyright 2000 Jeff Garzik <jgarzik@mandrakesoft.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#ifndef __LINUX_BUSINFO_H__
+#define __LINUX_BUSINFO_H__
+
+
+/* this is the only include allowed */
+#include <linux/types.h>
+
+
+enum {
+ BUSINFO_NULL = 0, /* unknown or error */
+ BUSINFO_ISA,
+ BUSINFO_PCI,
+ BUSINFO_SBUS,
+};
+
+
+struct isa_bus_info {
+ u32 mem; /* 24-bit, most significant 8 bits ignored */
+ u8 irq;
+ u8 dma;
+ u16 port;
+};
+
+
+struct pci_dev;
+struct pci_bus_info {
+ struct pci_dev *pdev;
+};
+
+
+struct sbus_bus;
+struct sbus_dev;
+struct sbus_bus_info {
+ struct sbus_bus *bus;
+ struct sbus_dev *dev;
+};
+
+
+struct bus_info {
+ unsigned int bus_type;
+ union {
+ struct isa_bus_info isa;
+ struct pci_bus_info pci;
+ struct sbus_bus_info sbus;
+ } u;
+};
+
+
+
+extern int businfo_read_proc (char *buf, char **start, off_t fpos,
+ int length, int *eof, struct bus_info *bi);
+
+#endif /* __LINUX_BUSINFO_H__ */
Index: linux_2_4/include/linux/netdevice.h
diff -u linux_2_4/include/linux/netdevice.h:1.1.1.8 linux_2_4/include/linux/netdevice.h:1.1.1.8.2.2
--- linux_2_4/include/linux/netdevice.h:1.1.1.8 Tue Oct 31 13:19:43 2000
+++ linux_2_4/include/linux/netdevice.h Wed Nov 1 22:50:19 2000
@@ -28,6 +28,7 @@
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
+#include <linux/businfo.h>

#include <asm/atomic.h>
#include <asm/cache.h>
@@ -261,6 +262,9 @@
int (*init)(struct net_device *dev);

/* ------- Fields preinitialized in Space.c finish here ------- */
+
+ /* Hardware bus identity, exported to userspace */
+ struct bus_info bus_info;

struct net_device *next_sched;

Index: linux_2_4/include/linux/pci.h
diff -u linux_2_4/include/linux/pci.h:1.1.1.2 linux_2_4/include/linux/pci.h:1.1.1.2.18.2
--- linux_2_4/include/linux/pci.h:1.1.1.2 Sun Oct 22 14:52:55 2000
+++ linux_2_4/include/linux/pci.h Wed Nov 1 22:50:19 2000
@@ -286,6 +286,7 @@
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/errno.h>
+#include <linux/businfo.h>

/* This defines the direction arg to the DMA mapping routines. */
#define PCI_DMA_BIDIRECTIONAL 0
int (*)(struct pci_dev *, u8, u8));
+
/* New-style probing supporting hot-pluggable devices */
int pci_register_driver(struct pci_driver *);
Index: linux_2_4/init/main.c
diff -u linux_2_4/init/main.c:1.1.1.10 linux_2_4/init/main.c:1.1.1.10.6.1
--- linux_2_4/init/main.c:1.1.1.10 Fri Oct 27 00:37:39 2000
+++ linux_2_4/init/main.c Wed Nov 1 22:50:19 2000
@@ -95,6 +95,7 @@
extern void signals_init(void);
extern void bdev_init(void);
extern int init_pcmcia_ds(void);
+extern void net_notifier_init(void);

extern void free_initmem(void);
extern void filesystem_setup(void);
@@ -710,6 +711,13 @@
#ifdef CONFIG_PCMCIA
init_pcmcia_ds(); /* Do this last */
#endif
+
+ /* do this after other 'do this last' stuff, because we want
+ * to minimize spurious executions of /sbin/network
+ * during boot-up
+ */
+ net_notifier_init();
+
/* Mount the root filesystem.. */
mount_root();

Index: linux_2_4/net/core/dev.c
diff -u linux_2_4/net/core/dev.c:1.1.1.8 linux_2_4/net/core/dev.c:1.1.1.8.4.2
--- linux_2_4/net/core/dev.c:1.1.1.8 Mon Oct 30 11:39:10 2000
+++ linux_2_4/net/core/dev.c Wed Nov 1 22:50:19 2000
@@ -2253,6 +2253,23 @@
}
}

+/**
+ * netdev_proc_businfo - output bus identity for a network device
+ *
+ * This function is static inline because using its address in
+ * create_proc_read_entry() call below forces it un-inlined...
+ * Except for the !CONFIG_PROC_FS case, when it goes away completely.
+ * XXX unverified...
+ */
+static inline int netdev_proc_businfo (char *buf, char **start, off_t fpos,
+ int length, int *eof, void *data)
+{
+ struct net_device *dev = data;
+
+ return businfo_read_proc(buf, start, fpos, length, eof, &dev->bus_info);
+}
+
+
static int dev_boot_phase = 1;

/**
@@ -2276,9 +2293,8 @@
int register_netdevice(struct net_device *dev)
{
struct net_device *d, **dp;
-#ifdef CONFIG_NET_DIVERT
int ret;
-#endif
+ char businfo_fn[32];

spin_lock_init(&dev->queue_lock);
spin_lock_init(&dev->xmit_lock);
@@ -2331,9 +2347,16 @@

dev->iflink = -1;

+ /* register /proc/net/if/???/businfo */
+ /* we purposefully ignore create_proc_read_entry failure */
+ sprintf(businfo_fn, "net/if/%s/businfo", dev->name);
+ create_proc_read_entry(businfo_fn, 0, NULL, netdev_proc_businfo, dev);
+
/* Init, if this function is available */
- if (dev->init && dev->init(dev) != 0)
- return -EIO;
+ if (dev->init && dev->init(dev) != 0) {
+ ret = -EIO;
+ goto err_out;
+ }

dev->ifindex = dev_new_index();
if (dev->iflink == -1)
@@ -2342,7 +2365,8 @@
/* Check for existence, and append to tail of chain */
for (dp=&dev_base; (d=*dp) != NULL; dp=&d->next) {
if (d == dev || strcmp(d->name, dev->name) == 0) {
- return -EEXIST;
+ ret = -EEXIST;
+ goto err_out;
}
}
/*
@@ -2371,13 +2395,17 @@
#ifdef CONFIG_NET_DIVERT
ret = alloc_divert_blk(dev);
if (ret)
- return ret;
+ goto err_out;
#endif /* CONFIG_NET_DIVERT */

/* Notify protocols, that a new device appeared. */
notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);

return 0;
+
+err_out:
+ remove_proc_entry(businfo_fn, NULL);
+ return ret;
}

/**
@@ -2423,6 +2451,7 @@

int unregister_netdevice(struct net_device *dev)
{
+ char businfo_fn[32];
unsigned long now, warning_time;
struct net_device *d, **dp;

@@ -2469,6 +2498,10 @@
if (dev->uninit)
dev->uninit(dev);

+ /* eliminate our /proc/net/if/???/businfo inode */
+ sprintf(businfo_fn, "net/if/%s/businfo", dev->name);
+ remove_proc_entry(businfo_fn, NULL);
+
/* Notifier chain MUST detach us from master device. */
BUG_TRAP(dev->master==NULL);

@@ -2687,4 +2720,64 @@
net_device_init();

return 0;
+}
+
+
+/* Notify userspace when a netdevice event occurs,
+ * by running /sbin/network [event] [interface]
+ * 'event' - an ASCII string indicating the type of event
+ * 'interface' - an ASCII string naming the interface on which
+ * the event occurred.
+ * Currently reported events are listed in netdev_event_names[].
+ */
+
+/* /sbin/network ONLY executes for events named here */
+static char *netdev_event_names[] = {
+ [NETDEV_REGISTER] = "register",
+ [NETDEV_UNREGISTER] = "unregister",
+};
+
+/* FIXME: make this changeable like hotplug_path */
+char sbin_network_path[256] = "/sbin/network";
+
+static int run_sbin_network(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = (struct net_device *) ptr;
+ char *argv[4], *envp[3];
+ int i = 0;
+
+ if ((event >= ARRAY_SIZE(netdev_event_names)) ||
+ !netdev_event_names[event])
+ return NOTIFY_DONE;
+
+ argv[0] = sbin_network_path;
+ argv[1] = netdev_event_names[event];
+ argv[2] = dev->name;
+ argv[3] = 0;
+
+ /* minimal command environment */
+ envp [i++] = "HOME=/";
+ envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+ envp [i] = 0;
+
+ call_usermodehelper (argv [0], argv, envp);
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block sbin_network = {
+ notifier_call: run_sbin_network,
+};
+
+/*
+ * called from init/main.c, -after- all the initcalls are complete.
+ * Registers a hook that calls /sbin/network on every netdev
+ * addition and removal.
+ */
+void __init net_notifier_init (void)
+{
+ if (register_netdevice_notifier(&sbin_network))
+ printk (KERN_WARNING "unable to register netdev notifier\n"
+ KERN_WARNING "/sbin/network will not be run.\n");
}
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