[PATCH] ppc32: Bump PMU interrupt priority

The Power Management Unit on PowerMacs is very sensitive to timeouts during
async message exchanges.  It uses rather crude protocol based on a shift
register with an interrupt and is almost continuously exchanging messages with
the host CPU on laptops.

This patch adds a routine to the open_pic driver to be able to select a PMU
driver so that it bumps it's interrupt priority to above the normal level.

This will allow PMU interrupts to occur while another interrupt is pending,
and thus reduce the risk of machine beeing abruptly shutdown by the PMU due to
a timeout in PMU communication caused by excessive interrupt latency.  The
problem is very rare, and usually just doesn't happen, but it is still useful
to make things even more robust.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/asm-ppc/open_pic.h b/include/asm-ppc/open_pic.h
index dbe853319741..7848aa610c05 100644
--- a/include/asm-ppc/open_pic.h
+++ b/include/asm-ppc/open_pic.h
@@ -25,6 +25,11 @@
 #define OPENPIC_VEC_IPI         118     /* and up */
 #define OPENPIC_VEC_SPURIOUS    255
 
+/* Priorities */
+#define OPENPIC_PRIORITY_IPI_BASE       10
+#define OPENPIC_PRIORITY_DEFAULT        4
+#define OPENPIC_PRIORITY_NMI            9
+
 /* OpenPIC IRQ controller structure */
 extern struct hw_interrupt_type open_pic;
 
@@ -42,6 +47,7 @@ extern int epic_serial_mode;
 extern void openpic_set_sources(int first_irq, int num_irqs, void __iomem *isr);
 extern void openpic_init(int linux_irq_offset);
 extern void openpic_init_nmi_irq(u_int irq);
+extern void openpic_set_irq_priority(u_int irq, u_int pri);
 extern void openpic_hookup_cascade(u_int irq, char *name,
                                    int (*cascade_fn)(struct pt_regs *));
 extern u_int openpic_irq(void);