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authorIan Munsie <imunsie@au1.ibm.com>2012-11-14 19:49:48 +0100
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-01-10 05:09:07 +0100
commitfe9e1d54e3ea2e5134d7aaa233441f9229326ef6 (patch)
treeb8347ea44bef6ad8c8a615a26a9a8124745f50f3 /arch/powerpc/kernel/entry_64.S
parentpowerpc: Select either privileged or hypervisor doorbell when sending (diff)
downloadlinux-fe9e1d54e3ea2e5134d7aaa233441f9229326ef6.tar.xz
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powerpc: Add code to handle soft-disabled doorbells on server
This patch adds the logic to properly handle doorbells that come in when interrupts have been soft disabled and to replay them when interrupts are re-enabled: - masked_##_H##interrupt is modified to leave interrupts enabled when a doorbell has come in since doorbells are edge sensitive and as such won't be automatically re-raised. - __check_irq_replay now tests if a doorbell happened on book3s, and returns either 0xe80 or 0xa00 depending on whether we are the hypervisor or not. - restore_check_irq_replay now tests for the two possible server doorbell vector numbers to replay. - __replay_interrupt also adds tests for the two server doorbell vector numbers, and is modified to use a compare instruction rather than an andi. on the single bit difference between 0x500 and 0x900. The last two use a CPU feature section to avoid needlessly testing against the hypervisor vector if it is not the hypervisor, and vice versa. Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
-rw-r--r--arch/powerpc/kernel/entry_64.S13
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index b310a0573625..73c1f083ba21 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -836,13 +836,22 @@ restore_check_irq_replay:
addi r3,r1,STACK_FRAME_OVERHEAD;
bl .timer_interrupt
b .ret_from_except
+#ifdef CONFIG_PPC_DOORBELL
+1:
#ifdef CONFIG_PPC_BOOK3E
-1: cmpwi cr0,r3,0x280
+ cmpwi cr0,r3,0x280
+#else
+ BEGIN_FTR_SECTION
+ cmpwi cr0,r3,0xe80
+ FTR_SECTION_ELSE
+ cmpwi cr0,r3,0xa00
+ ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
+#endif /* CONFIG_PPC_BOOK3E */
bne 1f
addi r3,r1,STACK_FRAME_OVERHEAD;
bl .doorbell_exception
b .ret_from_except
-#endif /* CONFIG_PPC_BOOK3E */
+#endif /* CONFIG_PPC_DOORBELL */
1: b .ret_from_except /* What else to do here ? */
unrecov_restore: