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sparc32: implement SMP IPIs using the generic functions

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The current sparc32 SMP IPI generation is implemented the
cross call function. The cross call function uses IRQ15 the
NMI, this is has the effect that IPIs will interrupt IRQ
critical areas and hang the system. Typically on/after
spin_lock_irqsave calls can be aborted.

The cross call functionality must still exist to flush
cache/TLBS.

This patch provides CPU models a custom way to implement
generation of IPIs on the generic code's request. The
typical approach is to generate an IRQ for each IPI case.

After this patch each sparc32 SMP CPU model needs to
implement IPIs in order to function properly.

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 00:08:51 +00:00
committed by David S. Miller
parent 2645e7219e
commit d6d048192b
5 changed files with 71 additions and 16 deletions
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5
arch/sparc/include/asm/cpudata_32.h
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@@ -16,6 +16,10 @@ typedef struct {
unsigned long clock_tick;
unsigned int multiplier;
unsigned int counter;
#ifdef CONFIG_SMP
unsigned int irq_resched_count;
unsigned int irq_call_count;
#endif
int prom_node;
int mid;
int next;
@@ -23,5 +27,6 @@ typedef struct {
DECLARE_PER_CPU(cpuinfo_sparc, __cpu_data);
#define cpu_data(__cpu) per_cpu(__cpu_data, (__cpu))
#define local_cpu_data() __get_cpu_var(__cpu_data)
#endif /* _SPARC_CPUDATA_H */