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xen: make hvc_xen console work for dom0.

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Use the console hypercalls for dom0 console.

[ Impact: Add Xen dom0 console ]
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Jeremy Fitzhardinge 2010-09-02 16:17:06 +01:00 committed by Stefano Stabellini
parent 4ec5387cc3
commit 4fe7d5a708
3 changed files with 67 additions and 34 deletions
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98
drivers/char/hvc_xen.c
View file

@ -78,7 +78,7 @@ static int __write_console(const char *data, int len)
return sent;
}
static int write_console(uint32_t vtermno, const char *data, int len)
static int domU_write_console(uint32_t vtermno, const char *data, int len)
{
int ret = len;
@ -101,7 +101,7 @@ static int write_console(uint32_t vtermno, const char *data, int len)
return ret;
}
static int read_console(uint32_t vtermno, char *buf, int len)
static int domU_read_console(uint32_t vtermno, char *buf, int len)
{
struct xencons_interface *intf = xencons_interface();
XENCONS_RING_IDX cons, prod;
@ -122,28 +122,62 @@ static int read_console(uint32_t vtermno, char *buf, int len)
return recv;
}
static const struct hv_ops hvc_ops = {
.get_chars = read_console,
.put_chars = write_console,
static struct hv_ops domU_hvc_ops = {
.get_chars = domU_read_console,
.put_chars = domU_write_console,
.notifier_add = notifier_add_irq,
.notifier_del = notifier_del_irq,
.notifier_hangup = notifier_hangup_irq,
};
static int __init xen_init(void)
static int dom0_read_console(uint32_t vtermno, char *buf, int len)
{
return HYPERVISOR_console_io(CONSOLEIO_read, len, buf);
}
/*
* Either for a dom0 to write to the system console, or a domU with a
* debug version of Xen
*/
static int dom0_write_console(uint32_t vtermno, const char *str, int len)
{
int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
if (rc < 0)
return 0;
return len;
}
static struct hv_ops dom0_hvc_ops = {
.get_chars = dom0_read_console,
.put_chars = dom0_write_console,
.notifier_add = notifier_add_irq,
.notifier_del = notifier_del_irq,
.notifier_hangup = notifier_hangup_irq,
};
static int __init xen_hvc_init(void)
{
struct hvc_struct *hp;
struct hv_ops *ops;
if (!xen_pv_domain() ||
xen_initial_domain() ||
!xen_start_info->console.domU.evtchn)
if (!xen_pv_domain())
return -ENODEV;
xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn);
if (xen_initial_domain()) {
ops = &dom0_hvc_ops;
xencons_irq = bind_virq_to_irq(VIRQ_CONSOLE, 0);
} else {
if (!xen_start_info->console.domU.evtchn)
return -ENODEV;
ops = &domU_hvc_ops;
xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn);
}
if (xencons_irq < 0)
xencons_irq = 0; /* NO_IRQ */
hp = hvc_alloc(HVC_COOKIE, xencons_irq, &hvc_ops, 256);
hp = hvc_alloc(HVC_COOKIE, xencons_irq, ops, 256);
if (IS_ERR(hp))
return PTR_ERR(hp);
@ -160,7 +194,7 @@ void xen_console_resume(void)
rebind_evtchn_irq(xen_start_info->console.domU.evtchn, xencons_irq);
}
static void __exit xen_fini(void)
static void __exit xen_hvc_fini(void)
{
if (hvc)
hvc_remove(hvc);
@ -168,29 +202,24 @@ static void __exit xen_fini(void)
static int xen_cons_init(void)
{
struct hv_ops *ops;
if (!xen_pv_domain())
return 0;
hvc_instantiate(HVC_COOKIE, 0, &hvc_ops);
if (xen_initial_domain())
ops = &dom0_hvc_ops;
else
ops = &domU_hvc_ops;
hvc_instantiate(HVC_COOKIE, 0, ops);
return 0;
}
module_init(xen_init);
module_exit(xen_fini);
module_init(xen_hvc_init);
module_exit(xen_hvc_fini);
console_initcall(xen_cons_init);
static void raw_console_write(const char *str, int len)
{
while(len > 0) {
int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
if (rc <= 0)
break;
str += rc;
len -= rc;
}
}
#ifdef CONFIG_EARLY_PRINTK
static void xenboot_write_console(struct console *console, const char *string,
unsigned len)
@ -198,19 +227,22 @@ static void xenboot_write_console(struct console *console, const char *string,
unsigned int linelen, off = 0;
const char *pos;
raw_console_write(string, len);
dom0_write_console(0, string, len);
write_console(0, "(early) ", 8);
if (xen_initial_domain())
return;
domU_write_console(0, "(early) ", 8);
while (off < len && NULL != (pos = strchr(string+off, '\n'))) {
linelen = pos-string+off;
if (off + linelen > len)
break;
write_console(0, string+off, linelen);
write_console(0, "\r\n", 2);
domU_write_console(0, string+off, linelen);
domU_write_console(0, "\r\n", 2);
off += linelen + 1;
}
if (off < len)
write_console(0, string+off, len-off);
domU_write_console(0, string+off, len-off);
}
struct console xenboot_console = {
@ -222,7 +254,7 @@ struct console xenboot_console = {
void xen_raw_console_write(const char *str)
{
raw_console_write(str, strlen(str));
dom0_write_console(0, str, strlen(str));
}
void xen_raw_printk(const char *fmt, ...)

2
drivers/xen/events.c
View file

@ -839,7 +839,7 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
}
static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
{
struct evtchn_bind_virq bind_virq;
int evtchn, irq;

1
include/xen/events.h
View file

@ -12,6 +12,7 @@ int bind_evtchn_to_irqhandler(unsigned int evtchn,
irq_handler_t handler,
unsigned long irqflags, const char *devname,
void *dev_id);
int bind_virq_to_irq(unsigned int virq, unsigned int cpu);
int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
irq_handler_t handler,
unsigned long irqflags, const char *devname,