mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Konrad Rzeszutek Wilk](/assets/img/avatar_default.png)
Since we have xen_has_pv_devices,xen_has_pv_disk_devices, xen_has_pv_nic_devices, and xen_has_pv_and_legacy_disk_devices to figure out the different 'unplug' behaviors - lets use those instead of this single int. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
217 lines
6.1 KiB
C
217 lines
6.1 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>
|
|
#include "xen-ops.h"
|
|
|
|
#define XEN_PLATFORM_ERR_MAGIC -1
|
|
#define XEN_PLATFORM_ERR_PROTOCOL -2
|
|
#define XEN_PLATFORM_ERR_BLACKLIST -3
|
|
|
|
#ifdef CONFIG_XEN_PVHVM
|
|
/* store the value of xen_emul_unplug after the unplug is done */
|
|
static int xen_platform_pci_unplug;
|
|
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;
|
|
}
|
|
|
|
bool xen_has_pv_devices()
|
|
{
|
|
if (!xen_domain())
|
|
return false;
|
|
|
|
/* PV domains always have them. */
|
|
if (xen_pv_domain())
|
|
return true;
|
|
|
|
/* And user has xen_platform_pci=0 set in guest config as
|
|
* driver did not modify the value. */
|
|
if (xen_platform_pci_unplug == 0)
|
|
return false;
|
|
|
|
if (xen_platform_pci_unplug & XEN_UNPLUG_NEVER)
|
|
return false;
|
|
|
|
if (xen_platform_pci_unplug & XEN_UNPLUG_ALL)
|
|
return true;
|
|
|
|
/* This is an odd one - we are going to run legacy
|
|
* and PV drivers at the same time. */
|
|
if (xen_platform_pci_unplug & XEN_UNPLUG_UNNECESSARY)
|
|
return true;
|
|
|
|
/* And the caller has to follow with xen_pv_{disk,nic}_devices
|
|
* to be certain which driver can load. */
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_has_pv_devices);
|
|
|
|
static bool __xen_has_pv_device(int state)
|
|
{
|
|
/* HVM domains might or might not */
|
|
if (xen_hvm_domain() && (xen_platform_pci_unplug & state))
|
|
return true;
|
|
|
|
return xen_has_pv_devices();
|
|
}
|
|
|
|
bool xen_has_pv_nic_devices(void)
|
|
{
|
|
return __xen_has_pv_device(XEN_UNPLUG_ALL_NICS | XEN_UNPLUG_ALL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_has_pv_nic_devices);
|
|
|
|
bool xen_has_pv_disk_devices(void)
|
|
{
|
|
return __xen_has_pv_device(XEN_UNPLUG_ALL_IDE_DISKS |
|
|
XEN_UNPLUG_AUX_IDE_DISKS | XEN_UNPLUG_ALL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_has_pv_disk_devices);
|
|
|
|
/*
|
|
* This one is odd - it determines whether you want to run PV _and_
|
|
* legacy (IDE) drivers together. This combination is only possible
|
|
* under HVM.
|
|
*/
|
|
bool xen_has_pv_and_legacy_disk_devices(void)
|
|
{
|
|
if (!xen_domain())
|
|
return false;
|
|
|
|
/* N.B. This is only ever used in HVM mode */
|
|
if (xen_pv_domain())
|
|
return false;
|
|
|
|
if (xen_platform_pci_unplug & XEN_UNPLUG_UNNECESSARY)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_has_pv_and_legacy_disk_devices);
|
|
|
|
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
|