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hv: switch to cpuhp state machine for synic init/cleanup 

To make it possible to online/offline CPUs switch to cpuhp infrastructure
for doing hv_synic_init()/hv_synic_cleanup().

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2016-12-07 14:53:11 -08:00 committed by Greg Kroah-Hartman
parent e7e97dd8b7
commit 76d36ab798
3 changed files with 20 additions and 18 deletions
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15
drivers/hv/hv.c
View File

@ -496,7 +496,7 @@ void hv_synic_free(void)
* retrieve the initialized message and event pages. Otherwise, we create and
* initialize the message and event pages.
*/
void hv_synic_init(void *arg)
int hv_synic_init(unsigned int cpu)
{
u64 version;
union hv_synic_simp simp;
@ -505,10 +505,8 @@ void hv_synic_init(void *arg)
union hv_synic_scontrol sctrl;
u64 vp_index;
int cpu = smp_processor_id();
if (!hv_context.hypercall_page)
return;
return -EFAULT;
/* Check the version */
rdmsrl(HV_X64_MSR_SVERSION, version);
@ -563,7 +561,7 @@ void hv_synic_init(void *arg)
HV_TIMER_FREQUENCY,
HV_MIN_DELTA_TICKS,
HV_MAX_MAX_DELTA_TICKS);
return;
return 0;
}
/*
@ -583,16 +581,15 @@ void hv_synic_clockevents_cleanup(void)
/*
* hv_synic_cleanup - Cleanup routine for hv_synic_init().
*/
void hv_synic_cleanup(void *arg)
int hv_synic_cleanup(unsigned int cpu)
{
union hv_synic_sint shared_sint;
union hv_synic_simp simp;
union hv_synic_siefp siefp;
union hv_synic_scontrol sctrl;
int cpu = smp_processor_id();
if (!hv_context.synic_initialized)
return;
return -EFAULT;
/* Turn off clockevent device */
if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) {
@ -624,4 +621,6 @@ void hv_synic_cleanup(void *arg)
rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
sctrl.enable = 0;
wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
return 0;
}

4
drivers/hv/hyperv_vmbus.h
View File

@ -505,9 +505,9 @@ extern int hv_synic_alloc(void);
extern void hv_synic_free(void);
extern void hv_synic_init(void *irqarg);
extern int hv_synic_init(unsigned int cpu);
extern void hv_synic_cleanup(void *arg);
extern int hv_synic_cleanup(unsigned int cpu);
extern void hv_synic_clockevents_cleanup(void);

19
drivers/hv/vmbus_drv.c
View File

@ -54,6 +54,7 @@ static struct acpi_device *hv_acpi_dev;
static struct completion probe_event;
static int hyperv_cpuhp_online;
static void hyperv_report_panic(struct pt_regs *regs)
{
@ -997,7 +998,12 @@ static int vmbus_bus_init(void)
* Initialize the per-cpu interrupt state and
* connect to the host.
*/
on_each_cpu(hv_synic_init, NULL, 1);
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv:online",
hv_synic_init, hv_synic_cleanup);
if (ret < 0)
goto err_alloc;
hyperv_cpuhp_online = ret;
ret = vmbus_connect();
if (ret)
goto err_connect;
@ -1019,7 +1025,7 @@ static int vmbus_bus_init(void)
return 0;
err_connect:
on_each_cpu(hv_synic_cleanup, NULL, 1);
cpuhp_remove_state(hyperv_cpuhp_online);
err_alloc:
hv_synic_free();
hv_remove_vmbus_irq();
@ -1478,12 +1484,9 @@ static struct acpi_driver vmbus_acpi_driver = {
static void hv_kexec_handler(void)
{
int cpu;
hv_synic_clockevents_cleanup();
vmbus_initiate_unload(false);
for_each_online_cpu(cpu)
smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1);
cpuhp_remove_state(hyperv_cpuhp_online);
hv_cleanup(false);
};
@ -1495,7 +1498,7 @@ static void hv_crash_handler(struct pt_regs *regs)
* doing the cleanup for current CPU only. This should be sufficient
* for kdump.
*/
hv_synic_cleanup(NULL);
hv_synic_cleanup(smp_processor_id());
hv_cleanup(true);
};
@ -1559,8 +1562,8 @@ static void __exit vmbus_exit(void)
hv_cleanup(false);
for_each_online_cpu(cpu) {
tasklet_kill(hv_context.event_dpc[cpu]);
smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1);
}
cpuhp_remove_state(hyperv_cpuhp_online);
hv_synic_free();
acpi_bus_unregister_driver(&vmbus_acpi_driver);
if (vmbus_proto_version > VERSION_WIN7)