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authorDaniel Hellstrom <daniel@gaisler.com>2011-05-02 00:08:54 +0000
committerDavid S. Miller <davem@davemloft.net>2011-05-16 13:07:44 -0700
commit55dd23eca666876e6028aa35d5e391cfced54871 (patch)
tree7f1006b68c8f04f4590c5442e5822b71d87e761d /arch/sparc/kernel/irq.h
parentecbc42b70acbc6327adefe9635db93fcf62bf59d (diff)
sparc32, sun4d: Implemented SMP IPIs support for SUN4D machines
The sun4d does not seem to have a distingstion between soft and hard IRQs. When generating IPIs the generated IRQ looks like a hard IRQ, this patch adds a "IPI check" in the sun4d irq trap handler at a predefined IRQ number (SUN4D_IPI_IRQ). Before generating an IPI a per-cpu memory structure is modified for the "IPI check" to successfully detect a IPI request to a specific processor, the check clears the IPI work requested. All three IPIs (resched, single and cpu-mask) use the same IRQ number. The IPI IRQ should preferrably be on a separate IRQ and definitly not shared with IRQ handlers requesting IRQ with IRQF_SHARED. Signed-off-by: Daniel Hellstrom <daniel@gaisler.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/irq.h')
-rw-r--r--arch/sparc/kernel/irq.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/sparc/kernel/irq.h b/arch/sparc/kernel/irq.h
index a189c273f638..100b9c204e78 100644
--- a/arch/sparc/kernel/irq.h
+++ b/arch/sparc/kernel/irq.h
@@ -86,4 +86,10 @@ BTFIXUPDEF_CALL(void, set_irq_udt, int)
#define set_cpu_int(cpu,level) BTFIXUP_CALL(set_cpu_int)(cpu,level)
#define clear_cpu_int(cpu,level) BTFIXUP_CALL(clear_cpu_int)(cpu,level)
#define set_irq_udt(cpu) BTFIXUP_CALL(set_irq_udt)(cpu)
+
+/* All SUN4D IPIs are sent on this IRQ, may be shared with hard IRQs */
+#define SUN4D_IPI_IRQ 14
+
+extern void sun4d_ipi_interrupt(void);
+
#endif