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MIPS: perf: Allow sharing IRQ with timer 

When requesting the performance counter overflow interrupt, pass flags
which are compatible with the cevt-r4k driver, in particular
IRQF_SHARED so that the two handlers can share the same IRQ. This is
possible since release 2 of the architecture where there are separate
pending interrupt bits for the timer interrupt and the performance
counter interrupt.

This will be necessary since the FDC interrupt can also be arbitrarily
routed to a CPU interrupt, possibly sharing with the timer, the
performance counters, or both, and it isn't scalable to have all the
handlers able to call other handlers that may be on the same IRQ line.

Shared handlers must also have a unique device pointer so they can be
individually removed, so &mipspmu is now passed in for that instead of
NULL.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9129/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
hifive-unleashed-5.1
James Hogan 2015-01-27 21:45:53 +00:00 committed by Ralf Baechle
parent f0c5b8944b
commit a1ec0e1883
1 changed files with 5 additions and 3 deletions
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8
arch/mips/kernel/perf_event_mipsxx.c
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@ -558,8 +558,10 @@ static int mipspmu_get_irq(void)
if (mipspmu.irq >= 0) {
/* Request my own irq handler. */
err = request_irq(mipspmu.irq, mipsxx_pmu_handle_irq,
IRQF_PERCPU | IRQF_NOBALANCING | IRQF_NO_THREAD,
"mips_perf_pmu", NULL);
IRQF_PERCPU | IRQF_NOBALANCING |
IRQF_NO_THREAD | IRQF_NO_SUSPEND |
IRQF_SHARED,
"mips_perf_pmu", &mipspmu);
if (err) {
pr_warn("Unable to request IRQ%d for MIPS performance counters!\n",
mipspmu.irq);
@ -582,7 +584,7 @@ static int mipspmu_get_irq(void)
static void mipspmu_free_irq(void)
{
if (mipspmu.irq >= 0)
free_irq(mipspmu.irq, NULL);
free_irq(mipspmu.irq, &mipspmu);
else if (cp0_perfcount_irq < 0)
perf_irq = save_perf_irq;
}