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Drivers: hv: Manage event tasklets on per-cpu basis 

Now that we can potentially take vmbus interrupts on any CPU, make the
tasklets per-CPU.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2012-12-01 06:46:53 -08:00 committed by Greg Kroah-Hartman
parent 0198631328
commit db11f12a11
3 changed files with 19 additions and 3 deletions
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12
drivers/hv/hv.c
View File

@ -27,6 +27,7 @@
#include <linux/vmalloc.h>
#include <linux/hyperv.h>
#include <linux/version.h>
#include <linux/interrupt.h>
#include <asm/hyperv.h>
#include "hyperv_vmbus.h"
@ -137,6 +138,8 @@ int hv_init(void)
sizeof(void *) * NR_CPUS);
memset(hv_context.vp_index, 0,
sizeof(int) * NR_CPUS);
memset(hv_context.event_dpc, 0,
sizeof(void *) * NR_CPUS);
max_leaf = query_hypervisor_info();
@ -285,6 +288,15 @@ void hv_synic_init(void *irqarg)
/* Check the version */
rdmsrl(HV_X64_MSR_SVERSION, version);
hv_context.event_dpc[cpu] = (struct tasklet_struct *)
kmalloc(sizeof(struct tasklet_struct),
GFP_ATOMIC);
if (hv_context.event_dpc[cpu] == NULL) {
pr_err("Unable to allocate event dpc\n");
goto cleanup;
}
tasklet_init(hv_context.event_dpc[cpu], vmbus_on_event, cpu);
hv_context.synic_message_page[cpu] =
(void *)get_zeroed_page(GFP_ATOMIC);

6
drivers/hv/hyperv_vmbus.h
View File

@ -504,6 +504,12 @@ struct hv_context {
* Linux cpuid 'a'.
*/
u32 vp_index[NR_CPUS];
/*
* Starting with win8, we can take channel interrupts on any CPU;
* we will manage the tasklet that handles events on a per CPU
* basis.
*/
struct tasklet_struct *event_dpc[NR_CPUS];
};
extern struct hv_context hv_context;

4
drivers/hv/vmbus_drv.c
View File

@ -41,7 +41,6 @@
static struct acpi_device *hv_acpi_dev;
static struct tasklet_struct msg_dpc;
static struct tasklet_struct event_dpc;
static struct completion probe_event;
static int irq;
@ -483,7 +482,7 @@ static irqreturn_t vmbus_isr(int irq, void *dev_id)
}
if (handled)
tasklet_schedule(&event_dpc);
tasklet_schedule(hv_context.event_dpc[cpu]);
page_addr = hv_context.synic_message_page[cpu];
@ -523,7 +522,6 @@ static int vmbus_bus_init(int irq)
}
tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0);
tasklet_init(&event_dpc, vmbus_on_event, 0);
ret = bus_register(&hv_bus);
if (ret)