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authorMahesh Salgaonkar <mahesh@linux.vnet.ibm.com>2014-07-29 18:40:13 +0530
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-08-05 16:33:57 +1000
commitbbdb760d8d477f0a57e3f2394e352ccc6f5e9961 (patch)
tree2509d82ecf8bcd2f7723116e91869debc3b9cbfb /arch/powerpc/kernel/idle_power7.S
parent0ef95b411e73d8789100d017c02c1329c5055802 (diff)
downloadlinux-next-bbdb760d8d477f0a57e3f2394e352ccc6f5e9961.tar.gz
powerpc/book3s: handle HMIs for cpus in nap mode.
HMIs are thread specific and can come while thread is in sleep/nap mode. Hence with SMT=off mode we can receive HMIs on sleeping threads. For interrupt received in nap mode, cpu wakes up at system reset vector, clears the interrupt and go back to nap mode again. But HMIs are sticky and they keep happening until we clear reason bits from HMER. Hence add a special check for HMI in reset vector (through power7_wakeup_* functions) and invoke opal call to handle HMI. Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/idle_power7.S')
-rw-r--r--arch/powerpc/kernel/idle_power7.S32
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/idle_power7.S b/arch/powerpc/kernel/idle_power7.S
index 5cf3d367190d..06305f653ab1 100644
--- a/arch/powerpc/kernel/idle_power7.S
+++ b/arch/powerpc/kernel/idle_power7.S
@@ -135,10 +135,36 @@ _GLOBAL(power7_sleep)
b power7_powersave_common
/* No return */
+#define CHECK_HMI_INTERRUPT \
+ mfspr r0,SPRN_SRR1; \
+BEGIN_FTR_SECTION_NESTED(66); \
+ rlwinm r0,r0,45-31,0xf; /* extract wake reason field (P8) */ \
+FTR_SECTION_ELSE_NESTED(66); \
+ rlwinm r0,r0,45-31,0xe; /* P7 wake reason field is 3 bits */ \
+ALT_FTR_SECTION_END_NESTED_IFSET(CPU_FTR_ARCH_207S, 66); \
+ cmpwi r0,0xa; /* Hypervisor maintenance ? */ \
+ bne 20f; \
+ /* Invoke opal call to handle hmi */ \
+ ld r2,PACATOC(r13); \
+ ld r1,PACAR1(r13); \
+ std r3,ORIG_GPR3(r1); /* Save original r3 */ \
+ li r0,OPAL_HANDLE_HMI; \
+ LOAD_REG_ADDR(r11,opal); \
+ ld r12,8(r11); \
+ ld r2,0(r11); \
+ mtctr r12; \
+ bctrl; \
+ ld r3,ORIG_GPR3(r1); /* Restore original r3 */ \
+20: nop;
+
+
_GLOBAL(power7_wakeup_tb_loss)
ld r2,PACATOC(r13);
ld r1,PACAR1(r13)
+BEGIN_FTR_SECTION
+ CHECK_HMI_INTERRUPT
+END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
/* Time base re-sync */
li r0,OPAL_RESYNC_TIMEBASE
LOAD_REG_ADDR(r11,opal);
@@ -163,6 +189,9 @@ _GLOBAL(power7_wakeup_tb_loss)
_GLOBAL(power7_wakeup_loss)
ld r1,PACAR1(r13)
+BEGIN_FTR_SECTION
+ CHECK_HMI_INTERRUPT
+END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
REST_NVGPRS(r1)
REST_GPR(2, r1)
ld r3,_CCR(r1)
@@ -178,6 +207,9 @@ _GLOBAL(power7_wakeup_noloss)
lbz r0,PACA_NAPSTATELOST(r13)
cmpwi r0,0
bne power7_wakeup_loss
+BEGIN_FTR_SECTION
+ CHECK_HMI_INTERRUPT
+END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
ld r1,PACAR1(r13)
ld r4,_MSR(r1)
ld r5,_NIP(r1)