[Xen-changelog] [xen-unstable] [IA64] Kexec: Add kexec_disable_iosapic

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1190927578 21600
# Node ID 2b0cbf3ef83f7cd61d7b6e022a7071695b7d4cf9
# Parent  d7c3b12014b355069bcea51520289befe6d4db9b
[IA64] Kexec: Add kexec_disable_iosapic

Ported from Linux, this shuts down iosapic before preforming kexec.
This resolves a problem whereby the serial port on an HP RX2620
(which uses IOSAPIC) was not able to accept input. It probably
resolves a bunch of other as yet unseen problems too.

Thanks to Takebe-san for working out the solution to this puzzle.

Cc: Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
---
 xen/arch/ia64/linux-xen/iosapic.c |   18 ++++++++++++++++++
 xen/arch/ia64/xen/crash.c         |    1 +
 xen/arch/ia64/xen/machine_kexec.c |    1 +
 xen/include/xen/kexec.h           |    1 +
 4 files changed, 21 insertions(+)

diff -r d7c3b12014b3 -r 2b0cbf3ef83f xen/arch/ia64/linux-xen/iosapic.c
--- a/xen/arch/ia64/linux-xen/iosapic.c Thu Sep 27 15:10:42 2007 -0600
+++ b/xen/arch/ia64/linux-xen/iosapic.c Thu Sep 27 15:12:58 2007 -0600
@@ -268,6 +268,24 @@ nop (unsigned int vector)
        /* do nothing... */
 }
 
+void
+kexec_disable_iosapic(void)
+{
+        struct iosapic_intr_info *info;
+        struct iosapic_rte_info *rte;
+        u8 vec = 0;
+        for (info = iosapic_intr_info; info <
+                        iosapic_intr_info + IA64_NUM_VECTORS; ++info, ++vec) {
+                list_for_each_entry(rte, &info->rtes,
+                                rte_list) {
+                        iosapic_write(rte->addr,
+                                        IOSAPIC_RTE_LOW(rte->rte_index),
+                                        IOSAPIC_MASK|vec);
+                        iosapic_eoi(rte->addr, vec);
+                }
+        }
+}
+
 static void
 mask_irq (unsigned int irq)
 {
diff -r d7c3b12014b3 -r 2b0cbf3ef83f xen/arch/ia64/xen/crash.c
--- a/xen/arch/ia64/xen/crash.c Thu Sep 27 15:10:42 2007 -0600
+++ b/xen/arch/ia64/xen/crash.c Thu Sep 27 15:12:58 2007 -0600
@@ -30,6 +30,7 @@ void machine_crash_shutdown(void)
     dom0_mm_pgd_mfn = __pa(dom0->arch.mm.pgd) >> PAGE_SHIFT;
     memcpy((char *)info + offsetof(crash_xen_info_t, dom0_mm_pgd_mfn),
           &dom0_mm_pgd_mfn, sizeof(dom0_mm_pgd_mfn));
+    kexec_disable_iosapic();
 #ifdef CONFIG_SMP
     smp_send_stop();
 #endif
diff -r d7c3b12014b3 -r 2b0cbf3ef83f xen/arch/ia64/xen/machine_kexec.c
--- a/xen/arch/ia64/xen/machine_kexec.c Thu Sep 27 15:10:42 2007 -0600
+++ b/xen/arch/ia64/xen/machine_kexec.c Thu Sep 27 15:12:58 2007 -0600
@@ -85,6 +85,7 @@ static void ia64_machine_kexec(struct un
 
 void machine_kexec(xen_kexec_image_t *image)
 {
+       kexec_disable_iosapic();
        unw_init_running(ia64_machine_kexec, image);
        for(;;);
 }
diff -r d7c3b12014b3 -r 2b0cbf3ef83f xen/include/xen/kexec.h
--- a/xen/include/xen/kexec.h   Thu Sep 27 15:10:42 2007 -0600
+++ b/xen/include/xen/kexec.h   Thu Sep 27 15:12:58 2007 -0600
@@ -27,6 +27,7 @@ void machine_reboot_kexec(xen_kexec_imag
 void machine_reboot_kexec(xen_kexec_image_t *image);
 void machine_kexec(xen_kexec_image_t *image);
 void kexec_crash(void);
+void kexec_disable_iosapic(void);
 void kexec_crash_save_cpu(void);
 crash_xen_info_t *kexec_crash_save_info(void);
 void machine_crash_shutdown(void);

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