WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] [PATCH 20 of 38] xen dom0: Make hvc_xen console work for dom

To: Ingo Molnar <mingo@xxxxxxx>
Subject: [Xen-devel] [PATCH 20 of 38] xen dom0: Make hvc_xen console work for dom0
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Thu, 13 Nov 2008 11:10:18 -0800
Cc: the arch/x86 maintainers <x86@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Ian Campbell <ian.campbell@xxxxxxxxxx>
Delivery-date: Thu, 13 Nov 2008 11:48:21 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <patchbomb.1226603398@xxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Use the console hypercalls for dom0 console.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Signed-off-by: Juan Quintela <quintela@xxxxxxxxxx>
---
 drivers/char/hvc_xen.c |  100 +++++++++++++++++++++++++++++++-----------------
 drivers/xen/events.c   |    2
 include/xen/events.h   |    2
 3 files changed, 69 insertions(+), 35 deletions(-)

diff --git a/drivers/char/hvc_xen.c b/drivers/char/hvc_xen.c
--- a/drivers/char/hvc_xen.c
+++ b/drivers/char/hvc_xen.c
@@ -55,7 +55,7 @@
        notify_remote_via_evtchn(xen_start_info->console.domU.evtchn);
 }
 
-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)
 {
        struct xencons_interface *intf = xencons_interface();
        XENCONS_RING_IDX cons, prod;
@@ -76,7 +76,7 @@
        return sent;
 }
 
-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;
@@ -97,28 +97,62 @@
        return recv;
 }
 
-static 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,
+};
+
+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)
-               return -ENODEV;
+       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);
 
@@ -135,7 +169,7 @@
                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);
@@ -143,29 +177,24 @@
 
 static int xen_cons_init(void)
 {
+       struct hv_ops *ops;
+
        if (!xen_pv_domain())
                return 0;
 
-       hvc_instantiate(HVC_COOKIE, 0, &hvc_ops);
+       ops = &domU_hvc_ops;
+       if (xen_initial_domain())
+               ops = &dom0_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)
@@ -173,19 +202,22 @@
        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 = {
@@ -197,7 +229,7 @@
 
 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, ...)
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -307,7 +307,7 @@
 }
 
 
-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;
diff --git a/include/xen/events.h b/include/xen/events.h
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -12,6 +12,8 @@
                              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,



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>