[IA64] SN: Add support for CPU disable

Add additional support for CPU disable on SN platforms.
Correctly setup the smp_affinity mask for I/O error IRQs.
Restrict the use of the feature to Altix 4000 and 450 systems
running with a CPU disable capable PROM, and do not allow disabling
of CPU 0.

Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

3 files changed, 3 insertions, 0 deletions

diff --git a/include/asm-ia64/sn/arch.h b/include/asm-ia64/sn/arch.h
index 16adc93d7a72..7caa1f44cd95 100644
--- a/include/asm-ia64/sn/arch.h
+++ b/include/asm-ia64/sn/arch.h
@@ -81,5 +81,6 @@ extern u8 sn_sharing_domain_size;
 extern u8 sn_region_size;
 
 extern void sn_flush_all_caches(long addr, long bytes);
+extern bool sn_cpu_disable_allowed(int cpu);
 
 #endif /* _ASM_IA64_SN_ARCH_H */
diff --git a/include/asm-ia64/sn/intr.h b/include/asm-ia64/sn/intr.h
index 12b54ddb06be..e0487aa97418 100644
--- a/include/asm-ia64/sn/intr.h
+++ b/include/asm-ia64/sn/intr.h
@@ -60,6 +60,7 @@ extern u64 sn_intr_alloc(nasid_t, int,
                               int, nasid_t, int);
 extern void sn_intr_free(nasid_t, int, struct sn_irq_info *);
 extern struct sn_irq_info *sn_retarget_vector(struct sn_irq_info *, nasid_t, int);
+extern void sn_set_err_irq_affinity(unsigned int);
 extern struct list_head **sn_irq_lh;
 
 #define CPU_VECTOR_TO_IRQ(cpuid,vector) (vector)
diff --git a/include/asm-ia64/sn/sn_feature_sets.h b/include/asm-ia64/sn/sn_feature_sets.h
index bfdc36273ed4..8e83ac117ace 100644
--- a/include/asm-ia64/sn/sn_feature_sets.h
+++ b/include/asm-ia64/sn/sn_feature_sets.h
@@ -31,6 +31,7 @@ extern int sn_prom_feature_available(int id);
 #define PRF_PAL_CACHE_FLUSH_SAFE        0
 #define PRF_DEVICE_FLUSH_LIST           1
 #define PRF_HOTPLUG_SUPPORT             2
+#define PRF_CPU_DISABLE_SUPPORT         3
 
 /* --------------------- OS Features -------------------------------*/