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sparc32, sun4d: Implemented SMP IPIs support for SUN4D machines

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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>
This commit is contained in:
Daniel Hellstrom
2011-05-02 00:08:54 +00:00
committed by David S. Miller
parent ecbc42b70a
commit 55dd23eca6
3 changed files with 94 additions and 0 deletions
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9
arch/sparc/kernel/sun4d_irq.c
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@@ -156,6 +156,15 @@ void sun4d_handler_irq(int pil, struct pt_regs *regs)
cc_set_iclr(1 << pil);
#ifdef CONFIG_SMP
/*
* Check IPI data structures after IRQ has been cleared. Hard and Soft
* IRQ can happen at the same time, so both cases are always handled.
*/
if (pil == SUN4D_IPI_IRQ)
sun4d_ipi_interrupt();
#endif
old_regs = set_irq_regs(regs);
irq_enter();
if (sbusl == 0) {