11bd04f6f3
* 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6: (109 commits) PCI: fix coding style issue in pci_save_state() PCI: add pci_request_acs PCI: fix BUG_ON triggered by logical PCIe root port removal PCI: remove ifdefed pci_cleanup_aer_correct_error_status PCI: unconditionally clear AER uncorr status register during cleanup x86/PCI: claim SR-IOV BARs in pcibios_allocate_resource PCI: portdrv: remove redundant definitions PCI: portdrv: remove unnecessary struct pcie_port_data PCI: portdrv: minor cleanup for pcie_port_device_register PCI: portdrv: add missing irq cleanup PCI: portdrv: enable device before irq initialization PCI: portdrv: cleanup service irqs initialization PCI: portdrv: check capabilities first PCI: portdrv: move PME capability check PCI: portdrv: remove redundant pcie type calculation PCI: portdrv: cleanup pcie_device registration PCI: portdrv: remove redundant pcie_port_device_probe PCI: Always set prefetchable base/limit upper32 registers PCI: read-modify-write the pcie device control register when initiating pcie flr PCI: show dma_mask bits in /sys ... Fixed up conflicts in: arch/x86/kernel/amd_iommu_init.c drivers/pci/dmar.c drivers/pci/hotplug/acpiphp_glue.c
112 lines
2.0 KiB
C
112 lines
2.0 KiB
C
#include <linux/notifier.h>
|
|
|
|
#include <xen/xen.h>
|
|
#include <xen/xenbus.h>
|
|
|
|
#include <asm/xen/hypervisor.h>
|
|
#include <asm/cpu.h>
|
|
|
|
static void enable_hotplug_cpu(int cpu)
|
|
{
|
|
if (!cpu_present(cpu))
|
|
arch_register_cpu(cpu);
|
|
|
|
set_cpu_present(cpu, true);
|
|
}
|
|
|
|
static void disable_hotplug_cpu(int cpu)
|
|
{
|
|
if (cpu_present(cpu))
|
|
arch_unregister_cpu(cpu);
|
|
|
|
set_cpu_present(cpu, false);
|
|
}
|
|
|
|
static int vcpu_online(unsigned int cpu)
|
|
{
|
|
int err;
|
|
char dir[32], state[32];
|
|
|
|
sprintf(dir, "cpu/%u", cpu);
|
|
err = xenbus_scanf(XBT_NIL, dir, "availability", "%s", state);
|
|
if (err != 1) {
|
|
printk(KERN_ERR "XENBUS: Unable to read cpu state\n");
|
|
return err;
|
|
}
|
|
|
|
if (strcmp(state, "online") == 0)
|
|
return 1;
|
|
else if (strcmp(state, "offline") == 0)
|
|
return 0;
|
|
|
|
printk(KERN_ERR "XENBUS: unknown state(%s) on CPU%d\n", state, cpu);
|
|
return -EINVAL;
|
|
}
|
|
static void vcpu_hotplug(unsigned int cpu)
|
|
{
|
|
if (!cpu_possible(cpu))
|
|
return;
|
|
|
|
switch (vcpu_online(cpu)) {
|
|
case 1:
|
|
enable_hotplug_cpu(cpu);
|
|
break;
|
|
case 0:
|
|
(void)cpu_down(cpu);
|
|
disable_hotplug_cpu(cpu);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void handle_vcpu_hotplug_event(struct xenbus_watch *watch,
|
|
const char **vec, unsigned int len)
|
|
{
|
|
unsigned int cpu;
|
|
char *cpustr;
|
|
const char *node = vec[XS_WATCH_PATH];
|
|
|
|
cpustr = strstr(node, "cpu/");
|
|
if (cpustr != NULL) {
|
|
sscanf(cpustr, "cpu/%u", &cpu);
|
|
vcpu_hotplug(cpu);
|
|
}
|
|
}
|
|
|
|
static int setup_cpu_watcher(struct notifier_block *notifier,
|
|
unsigned long event, void *data)
|
|
{
|
|
int cpu;
|
|
static struct xenbus_watch cpu_watch = {
|
|
.node = "cpu",
|
|
.callback = handle_vcpu_hotplug_event};
|
|
|
|
(void)register_xenbus_watch(&cpu_watch);
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
if (vcpu_online(cpu) == 0) {
|
|
(void)cpu_down(cpu);
|
|
set_cpu_present(cpu, false);
|
|
}
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int __init setup_vcpu_hotplug_event(void)
|
|
{
|
|
static struct notifier_block xsn_cpu = {
|
|
.notifier_call = setup_cpu_watcher };
|
|
|
|
if (!xen_pv_domain())
|
|
return -ENODEV;
|
|
|
|
register_xenstore_notifier(&xsn_cpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
arch_initcall(setup_vcpu_hotplug_event);
|
|
|