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xics: Implement xics_ics_free()

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This implements interrupt release function so IRQs can be returned back
to the pool for reuse in cases such as PCI hot plug.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexey Kardashevskiy 2014-05-30 19:34:18 +10:00 committed by Alexander Graf
parent ba0e5bf8de
commit 51bba713fe
3 changed files with 30 additions and 0 deletions
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27
hw/intc/xics.c
View File

@ -775,6 +775,33 @@ int xics_alloc_block(XICSState *icp, int src, int num, bool lsi, bool align)
return first;
}
static void ics_free(ICSState *ics, int srcno, int num)
{
int i;
for (i = srcno; i < srcno + num; ++i) {
if (ICS_IRQ_FREE(ics, i)) {
trace_xics_ics_free_warn(ics - ics->icp->ics, i + ics->offset);
}
memset(&ics->irqs[i], 0, sizeof(ICSIRQState));
}
}
void xics_free(XICSState *icp, int irq, int num)
{
int src = xics_find_source(icp, irq);
if (src >= 0) {
ICSState *ics = &icp->ics[src];
/* FIXME: implement multiple sources */
assert(src == 0);
trace_xics_ics_free(ics - icp->ics, irq, num);
ics_free(ics, irq - ics->offset, num);
}
}
/*
* Guest interfaces
*/

1
include/hw/ppc/xics.h
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@ -162,6 +162,7 @@ qemu_irq xics_get_qirq(XICSState *icp, int irq);
void xics_set_irq_type(XICSState *icp, int irq, bool lsi);
int xics_alloc(XICSState *icp, int src, int irq_hint, bool lsi);
int xics_alloc_block(XICSState *icp, int src, int num, bool lsi, bool align);
void xics_free(XICSState *icp, int irq, int num);
void xics_cpu_setup(XICSState *icp, PowerPCCPU *cpu);

2
trace-events
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@ -1192,6 +1192,8 @@ xics_alloc(int src, int irq) "source#%d, irq %d"
xics_alloc_failed_hint(int src, int irq) "source#%d, irq %d is already in use"
xics_alloc_failed_no_left(int src) "source#%d, no irq left"
xics_alloc_block(int src, int first, int num, bool lsi, int align) "source#%d, first irq %d, %d irqs, lsi=%d, alignnum %d"
xics_ics_free(int src, int irq, int num) "Source#%d, first irq %d, %d irqs"
xics_ics_free_warn(int src, int irq) "Source#%d, irq %d is already free"
# hw/ppc/spapr.c
spapr_cas_failed(unsigned long n) "DT diff buffer is too small: %ld bytes"