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authorPaul Mackerras <paulus@samba.org>2006-10-04 10:47:49 +0400
committerPaul Mackerras <paulus@samba.org>2006-10-16 10:31:36 +0400
commitd04c56f73c30a5e593202ecfcf25ed43d42363a2 (patch)
treebec1208293c904b73f12dd9179ebf8e88dbdb085 /include/asm-powerpc/paca.h
parent284a940675a64df253e3dffc60b09bb4bbb149e4 (diff)
downloadlinux-d04c56f73c30a5e593202ecfcf25ed43d42363a2.tar.xz
[POWERPC] Lazy interrupt disabling for 64-bit machines
This implements a lazy strategy for disabling interrupts. This means that local_irq_disable() et al. just clear the 'interrupts are enabled' flag in the paca. If an interrupt comes along, the interrupt entry code notices that interrupts are supposed to be disabled, and clears the EE bit in SRR1, clears the 'interrupts are hard-enabled' flag in the paca, and returns. This means that interrupts only actually get disabled in the processor when an interrupt comes along. When interrupts are enabled by local_irq_enable() et al., the code sets the interrupts-enabled flag in the paca, and then checks whether interrupts got hard-disabled. If so, it also sets the EE bit in the MSR to hard-enable the interrupts. This has the potential to improve performance, and also makes it easier to make a kernel that can boot on iSeries and on other 64-bit machines, since this lazy-disable strategy is very similar to the soft-disable strategy that iSeries already uses. This version renames paca->proc_enabled to paca->soft_enabled, and changes a couple of soft-disables in the kexec code to hard-disables, which should fix the crash that Michael Ellerman saw. This doesn't yet use a reserved CR field for the soft_enabled and hard_enabled flags. This applies on top of Stephen Rothwell's patches to make it possible to build a combined iSeries/other kernel. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include/asm-powerpc/paca.h')
-rw-r--r--include/asm-powerpc/paca.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/asm-powerpc/paca.h b/include/asm-powerpc/paca.h
index 0a4e5c93e8e6..0d3adc09c847 100644
--- a/include/asm-powerpc/paca.h
+++ b/include/asm-powerpc/paca.h
@@ -93,7 +93,8 @@ struct paca_struct {
u64 stab_rr; /* stab/slb round-robin counter */
u64 saved_r1; /* r1 save for RTAS calls */
u64 saved_msr; /* MSR saved here by enter_rtas */
- u8 proc_enabled; /* irq soft-enable flag */
+ u8 soft_enabled; /* irq soft-enable flag */
+ u8 hard_enabled; /* set if irqs are enabled in MSR */
u8 io_sync; /* writel() needs spin_unlock sync */
/* Stuff for accurate time accounting */