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powerpc/powernv: Add context management for Fast Sleep

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Before adding Fast-Sleep into the cpuidle framework, some low level
support needs to be added to enable it. This includes saving and
restoring of certain registers at entry and exit time of this state
respectively just like we do in the NAP idle state.

Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
[Changelog modified by Preeti U. Murthy <preeti@linux.vnet.ibm.com>]
Signed-off-by: Preeti U. Murthy <preeti@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Vaidyanathan Srinivasan
2014-02-26 05:38:25 +05:30
committed by Benjamin Herrenschmidt
parent 1b7839559b
commit aca79d2b6e
3 changed files with 53 additions and 21 deletions
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10
arch/powerpc/kernel/exceptions-64s.S
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@@ -121,9 +121,10 @@ BEGIN_FTR_SECTION
cmpwi cr1,r13,2
/* Total loss of HV state is fatal, we could try to use the
* PIR to locate a PACA, then use an emergency stack etc...
* but for now, let's just stay stuck here
* OPAL v3 based powernv platforms have new idle states
* which fall in this catagory.
*/
bgt cr1,.
bgt cr1,8f
GET_PACA(r13)
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
@@ -141,6 +142,11 @@ BEGIN_FTR_SECTION
beq cr1,2f
b .power7_wakeup_noloss
2: b .power7_wakeup_loss
/* Fast Sleep wakeup on PowerNV */
8: GET_PACA(r13)
b .power7_wakeup_loss
9:
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
#endif /* CONFIG_PPC_P7_NAP */