From 55dd23eca666876e6028aa35d5e391cfced54871 Mon Sep 17 00:00:00 2001 From: Daniel Hellstrom Date: Mon, 2 May 2011 00:08:54 +0000 Subject: 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 Signed-off-by: David S. Miller --- arch/sparc/kernel/irq.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/sparc/kernel/irq.h') 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 -- cgit v1.2.3