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| author | Daniel Hellstrom <daniel@gaisler.com> | 2011-05-02 00:08:54 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-05-16 13:07:44 -0700 |
| commit | 55dd23eca666876e6028aa35d5e391cfced54871 (patch) | |
| tree | 7f1006b68c8f04f4590c5442e5822b71d87e761d /arch/sparc/kernel/sun4d_irq.c | |
| parent | ecbc42b70acbc6327adefe9635db93fcf62bf59d (diff) | |
| download | linux-stable-55dd23eca666876e6028aa35d5e391cfced54871.tar.gz linux-stable-55dd23eca666876e6028aa35d5e391cfced54871.tar.bz2 linux-stable-55dd23eca666876e6028aa35d5e391cfced54871.zip | |
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/sun4d_irq.c')
| -rw-r--r-- | arch/sparc/kernel/sun4d_irq.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/sparc/kernel/sun4d_irq.c b/arch/sparc/kernel/sun4d_irq.c index b830914e32d3..a9ea60eb2c10 100644 --- a/arch/sparc/kernel/sun4d_irq.c +++ b/arch/sparc/kernel/sun4d_irq.c @@ -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) { |