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pseries: added allocator for a block of IRQs

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The patch adds a simple helper which allocates a consecutive sequence
of IRQs calling spapr_allocate_irq for each and checks that allocated
IRQs go consequently.

The patch is required for upcoming support of MSI/MSIX on POWER.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexey Kardashevskiy 2012-08-07 16:10:34 +00:00 committed by Alexander Graf
parent fa28f71b4a
commit f4b9523ba6
2 changed files with 27 additions and 0 deletions
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26
hw/spapr.c
View file

@ -105,6 +105,32 @@ int spapr_allocate_irq(int hint, enum xics_irq_type type)
return irq;
}
/* Allocate block of consequtive IRQs, returns a number of the first */
int spapr_allocate_irq_block(int num, enum xics_irq_type type)
{
int first = -1;
int i;
for (i = 0; i < num; ++i) {
int irq;
irq = spapr_allocate_irq(0, type);
if (!irq) {
return -1;
}
if (0 == i) {
first = irq;
}
/* If the above doesn't create a consecutive block then that's
* an internal bug */
assert(irq == (first + i));
}
return first;
}
static int spapr_set_associativity(void *fdt, sPAPREnvironment *spapr)
{
int ret = 0, offset;

1
hw/spapr.h
View file

@ -290,6 +290,7 @@ target_ulong spapr_hypercall(CPUPPCState *env, target_ulong opcode,
target_ulong *args);
int spapr_allocate_irq(int hint, enum xics_irq_type type);
int spapr_allocate_irq_block(int num, enum xics_irq_type type);
static inline int spapr_allocate_msi(int hint)
{