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xen/arm: compile and run xenbus

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bind_evtchn_to_irqhandler can legitimately return 0 (irq 0): it is not
an error.

If Linux is running as an HVM domain and is running as Dom0, use
xenstored_local_init to initialize the xenstore page and event channel.

Changes in v4:
- do not xs_reset_watches on dom0.

Changes in v2:
- refactor xenbus_init.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
[v5: Fixed case switch indentations]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Stefano Stabellini 2012-09-14 12:13:12 +01:00 committed by Konrad Rzeszutek Wilk
parent e58f5b5511
commit ecc635f90a
3 changed files with 41 additions and 16 deletions
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2
drivers/xen/xenbus/xenbus_comms.c
View File

@ -224,7 +224,7 @@ int xb_init_comms(void)
int err;
err = bind_evtchn_to_irqhandler(xen_store_evtchn, wake_waiting,
0, "xenbus", &xb_waitq);
if (err <= 0) {
if (err < 0) {
printk(KERN_ERR "XENBUS request irq failed %i\n", err);
return err;
}

52
drivers/xen/xenbus/xenbus_probe.c
View File

@ -719,17 +719,47 @@ static int __init xenstored_local_init(void)
return err;
}
enum xenstore_init {
UNKNOWN,
PV,
HVM,
LOCAL,
};
static int __init xenbus_init(void)
{
int err = 0;
enum xenstore_init usage = UNKNOWN;
uint64_t v = 0;
if (!xen_domain())
return -ENODEV;
xenbus_ring_ops_init();
if (xen_hvm_domain()) {
uint64_t v = 0;
if (xen_pv_domain())
usage = PV;
if (xen_hvm_domain())
usage = HVM;
if (xen_hvm_domain() && xen_initial_domain())
usage = LOCAL;
if (xen_pv_domain() && !xen_start_info->store_evtchn)
usage = LOCAL;
if (xen_pv_domain() && xen_start_info->store_evtchn)
xenstored_ready = 1;
switch (usage) {
case LOCAL:
err = xenstored_local_init();
if (err)
goto out_error;
xen_store_interface = mfn_to_virt(xen_store_mfn);
break;
case PV:
xen_store_evtchn = xen_start_info->store_evtchn;
xen_store_mfn = xen_start_info->store_mfn;
xen_store_interface = mfn_to_virt(xen_store_mfn);
break;
case HVM:
err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);
if (err)
goto out_error;
@ -738,18 +768,12 @@ static int __init xenbus_init(void)
if (err)
goto out_error;
xen_store_mfn = (unsigned long)v;
xen_store_interface = ioremap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
} else {
xen_store_evtchn = xen_start_info->store_evtchn;
xen_store_mfn = xen_start_info->store_mfn;
if (xen_store_evtchn)
xenstored_ready = 1;
else {
err = xenstored_local_init();
if (err)
goto out_error;
}
xen_store_interface = mfn_to_virt(xen_store_mfn);
xen_store_interface =
ioremap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
break;
default:
pr_warn("Xenstore state unknown\n");
break;
}
/* Initialize the interface to xenstore. */

3
drivers/xen/xenbus/xenbus_xs.c
View File

@ -44,6 +44,7 @@
#include <linux/rwsem.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <asm/xen/hypervisor.h>
#include <xen/xenbus.h>
#include <xen/xen.h>
#include "xenbus_comms.h"
@ -622,7 +623,7 @@ static void xs_reset_watches(void)
{
int err, supported = 0;
if (!xen_hvm_domain())
if (!xen_hvm_domain() || xen_initial_domain())
return;
err = xenbus_scanf(XBT_NIL, "control",