mirror of
https://github.com/torvalds/linux.git
synced 2024-12-25 12:21:37 +00:00
3c52b7bf69
Removing __init from check_platform_magic since it is called by xen_unplug_emulated_devices in non-init contexts (It probably gets inlined because of -finline-functions-called-once, removing __init is more to avoid mismatch being reported). Signed-off-by: Raghavendra D Prabhu <rprabhu@wnohang.net> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
144 lines
4.4 KiB
C
144 lines
4.4 KiB
C
/******************************************************************************
|
|
* platform-pci-unplug.c
|
|
*
|
|
* Xen platform PCI device driver
|
|
* Copyright (c) 2010, Citrix
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
|
|
* Place - Suite 330, Boston, MA 02111-1307 USA.
|
|
*
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <xen/platform_pci.h>
|
|
|
|
#define XEN_PLATFORM_ERR_MAGIC -1
|
|
#define XEN_PLATFORM_ERR_PROTOCOL -2
|
|
#define XEN_PLATFORM_ERR_BLACKLIST -3
|
|
|
|
/* store the value of xen_emul_unplug after the unplug is done */
|
|
int xen_platform_pci_unplug;
|
|
EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
|
|
#ifdef CONFIG_XEN_PVHVM
|
|
static int xen_emul_unplug;
|
|
|
|
static int check_platform_magic(void)
|
|
{
|
|
short magic;
|
|
char protocol;
|
|
|
|
magic = inw(XEN_IOPORT_MAGIC);
|
|
if (magic != XEN_IOPORT_MAGIC_VAL) {
|
|
printk(KERN_ERR "Xen Platform PCI: unrecognised magic value\n");
|
|
return XEN_PLATFORM_ERR_MAGIC;
|
|
}
|
|
|
|
protocol = inb(XEN_IOPORT_PROTOVER);
|
|
|
|
printk(KERN_DEBUG "Xen Platform PCI: I/O protocol version %d\n",
|
|
protocol);
|
|
|
|
switch (protocol) {
|
|
case 1:
|
|
outw(XEN_IOPORT_LINUX_PRODNUM, XEN_IOPORT_PRODNUM);
|
|
outl(XEN_IOPORT_LINUX_DRVVER, XEN_IOPORT_DRVVER);
|
|
if (inw(XEN_IOPORT_MAGIC) != XEN_IOPORT_MAGIC_VAL) {
|
|
printk(KERN_ERR "Xen Platform: blacklisted by host\n");
|
|
return XEN_PLATFORM_ERR_BLACKLIST;
|
|
}
|
|
break;
|
|
default:
|
|
printk(KERN_WARNING "Xen Platform PCI: unknown I/O protocol version");
|
|
return XEN_PLATFORM_ERR_PROTOCOL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void xen_unplug_emulated_devices(void)
|
|
{
|
|
int r;
|
|
|
|
/* user explicitly requested no unplug */
|
|
if (xen_emul_unplug & XEN_UNPLUG_NEVER)
|
|
return;
|
|
/* check the version of the xen platform PCI device */
|
|
r = check_platform_magic();
|
|
/* If the version matches enable the Xen platform PCI driver.
|
|
* Also enable the Xen platform PCI driver if the host does
|
|
* not support the unplug protocol (XEN_PLATFORM_ERR_MAGIC)
|
|
* but the user told us that unplugging is unnecessary. */
|
|
if (r && !(r == XEN_PLATFORM_ERR_MAGIC &&
|
|
(xen_emul_unplug & XEN_UNPLUG_UNNECESSARY)))
|
|
return;
|
|
/* Set the default value of xen_emul_unplug depending on whether or
|
|
* not the Xen PV frontends and the Xen platform PCI driver have
|
|
* been compiled for this kernel (modules or built-in are both OK). */
|
|
if (!xen_emul_unplug) {
|
|
if (xen_must_unplug_nics()) {
|
|
printk(KERN_INFO "Netfront and the Xen platform PCI driver have "
|
|
"been compiled for this kernel: unplug emulated NICs.\n");
|
|
xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
|
|
}
|
|
if (xen_must_unplug_disks()) {
|
|
printk(KERN_INFO "Blkfront and the Xen platform PCI driver have "
|
|
"been compiled for this kernel: unplug emulated disks.\n"
|
|
"You might have to change the root device\n"
|
|
"from /dev/hd[a-d] to /dev/xvd[a-d]\n"
|
|
"in your root= kernel command line option\n");
|
|
xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
|
|
}
|
|
}
|
|
/* Now unplug the emulated devices */
|
|
if (!(xen_emul_unplug & XEN_UNPLUG_UNNECESSARY))
|
|
outw(xen_emul_unplug, XEN_IOPORT_UNPLUG);
|
|
xen_platform_pci_unplug = xen_emul_unplug;
|
|
}
|
|
|
|
static int __init parse_xen_emul_unplug(char *arg)
|
|
{
|
|
char *p, *q;
|
|
int l;
|
|
|
|
for (p = arg; p; p = q) {
|
|
q = strchr(p, ',');
|
|
if (q) {
|
|
l = q - p;
|
|
q++;
|
|
} else {
|
|
l = strlen(p);
|
|
}
|
|
if (!strncmp(p, "all", l))
|
|
xen_emul_unplug |= XEN_UNPLUG_ALL;
|
|
else if (!strncmp(p, "ide-disks", l))
|
|
xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
|
|
else if (!strncmp(p, "aux-ide-disks", l))
|
|
xen_emul_unplug |= XEN_UNPLUG_AUX_IDE_DISKS;
|
|
else if (!strncmp(p, "nics", l))
|
|
xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
|
|
else if (!strncmp(p, "unnecessary", l))
|
|
xen_emul_unplug |= XEN_UNPLUG_UNNECESSARY;
|
|
else if (!strncmp(p, "never", l))
|
|
xen_emul_unplug |= XEN_UNPLUG_NEVER;
|
|
else
|
|
printk(KERN_WARNING "unrecognised option '%s' "
|
|
"in parameter 'xen_emul_unplug'\n", p);
|
|
}
|
|
return 0;
|
|
}
|
|
early_param("xen_emul_unplug", parse_xen_emul_unplug);
|
|
#endif
|