[XenPPC] [linux-ppc-2.6] [POWERPC][XEN] Make MPIC sharing between Xen and Dom0 optional

[Xen patchbot-linux-ppc-2.6 <patchbot-linux-ppc-2.6@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
# Node ID a2d836b6ab41c273826bfba8ebe30ac63f153e93
# Parent  199b457c43256143561ea7943d40ce72713c73b0
[POWERPC][XEN] Make MPIC sharing between Xen and Dom0 optional

Tho right now it is the only option.

Signed-off-by: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
---
 arch/powerpc/platforms/xen/evtchn.c |   36 +++++++++++++++++++++---------------
 arch/powerpc/platforms/xen/setup.c  |    5 +++++
 2 files changed, 26 insertions(+), 15 deletions(-)

diff -r 199b457c4325 -r a2d836b6ab41 arch/powerpc/platforms/xen/evtchn.c
--- a/arch/powerpc/platforms/xen/evtchn.c       Mon Aug 28 18:43:52 2006 -0500
+++ b/arch/powerpc/platforms/xen/evtchn.c       Thu Aug 31 17:47:08 2006 -0400
@@ -1,4 +1,3 @@
-
 #define DEBUG
 
 #include <linux/module.h>
@@ -16,8 +15,10 @@
 #endif
 
 /*
- * We are currently letting Dom0 control the mpic. However, Xen will
- * Ack all interrupts. Here is how it works:
+ * The following code, shares the MPIV controller between Xen and
+ * Dom0. However, Xen will Ack all interrupts. Here is how it works:
+ * the controlling of the PIC with Dom0. However, Xen will Ack all
+ * interrupts. Here is how it works:
  *
  *   1. Dom0 sees a device and uses the and requests that Xen binds
  *      the IRQ to it.
@@ -32,12 +33,6 @@ struct hw_interrupt_type *xen_pirq;
 struct hw_interrupt_type *xen_pirq;
 static struct hw_interrupt_type hc_irq;
 extern struct machdep_calls mach_maple_md;
-
-int xen_get_irq(struct pt_regs *regs)
-{
-       evtchn_do_upcall(regs);
-       return -1;
-}
 
 static unsigned int xen_startup_irq(unsigned int irq)
 {
@@ -80,14 +75,9 @@ static inline struct mpic *mpic_from_irq
        return container_of(irq_desc[irq].chip, struct mpic, hc_irq);
 }
 
-void xen_maple_init_IRQ(void)
+static void xen_share_pic(void)
 {
        struct mpic *mpic;
-
-       xen_init_IRQ();
-
-       if (!(xen_start_info->flags & SIF_INITDOMAIN))
-               return;
 
        xen_pirq = irq_desc[0].chip;
        mach_maple_md.init_IRQ();
@@ -112,5 +102,21 @@ void xen_maple_init_IRQ(void)
 
        hc_irq.end = mpic->hc_irq.end;
        mpic->hc_irq.end = xen_end_irq;
+}
 
+void xen_maple_init_IRQ(void)
+{
+       xen_init_IRQ();
+
+       if (!(xen_start_info->flags & SIF_INITDOMAIN))
+               return;
+
+       printk("Sharing PIC with Xen");
+       xen_share_pic();
 }
+
+int xen_get_irq(struct pt_regs *regs)
+{
+       evtchn_do_upcall(regs);
+       return -1;
+}
diff -r 199b457c4325 -r a2d836b6ab41 arch/powerpc/platforms/xen/setup.c
--- a/arch/powerpc/platforms/xen/setup.c        Mon Aug 28 18:43:52 2006 -0500
+++ b/arch/powerpc/platforms/xen/setup.c        Thu Aug 31 17:47:08 2006 -0400
@@ -1,6 +1,7 @@
 
 #define DEBUG
 #undef XENPPC_USE_IDLE
+#define CONFIG_SHARE_MPIC
 
 #include <linux/module.h>
 #include <linux/rwsem.h>
@@ -298,7 +299,11 @@ define_machine(xen) {
        .probe                  = xen_probe,
        .setup_arch             = xen_setup_arch,
        .init_early             = xen_init_early,
+#ifdef CONFIG_SHARE_MPIC
        .init_IRQ               = xen_maple_init_IRQ,
+#else
+       .init_IRQ               = xen_init_IRQ,
+#endif
        .get_irq                = xen_get_irq,
        .get_boot_time          = 0,
        .set_rtc_time           = 0,

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