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authorKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>2005-04-25 16:26:23 -0400
committerTony Luck <tony.luck@intel.com>2005-04-25 16:26:23 -0400
commit24eeb568aeeaee771b9f0a6fd6f5d01040a887da (patch)
tree4d3e731845cde292b5a40ff7db97cce639dc073c /include
parente927ecb05e1ce4bbb1e10f57008c94994e2160f5 (diff)
[IA64] vector sharing (Large I/O system support)
Current ia64 linux cannot handle greater than 184 interrupt sources because of the lack of vectors. The following patch enables ia64 linux to handle greater than 184 interrupt sources by allowing the same vector number to be shared by multiple IOSAPIC's RTEs. The design of this patch is besed on "Intel(R) Itanium(R) Processor Family Interrupt Architecture Guide". Even if you don't have a large I/O system, you can see the behavior of vector sharing by changing IOSAPIC_LAST_DEVICE_VECTOR to fewer value. Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/asm-ia64/hw_irq.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-ia64/hw_irq.h b/include/asm-ia64/hw_irq.h
index 041ab8c51a64..cd4e06b74ab6 100644
--- a/include/asm-ia64/hw_irq.h
+++ b/include/asm-ia64/hw_irq.h
@@ -81,6 +81,7 @@ extern __u8 isa_irq_to_vector_map[16];
81 81
82extern struct hw_interrupt_type irq_type_ia64_lsapic; /* CPU-internal interrupt controller */ 82extern struct hw_interrupt_type irq_type_ia64_lsapic; /* CPU-internal interrupt controller */
83 83
84extern int assign_irq_vector_nopanic (int irq); /* allocate a free vector without panic */
84extern int assign_irq_vector (int irq); /* allocate a free vector */ 85extern int assign_irq_vector (int irq); /* allocate a free vector */
85extern void free_irq_vector (int vector); 86extern void free_irq_vector (int vector);
86extern void ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect); 87extern void ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect);