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Commit 0dfffb48 authored by Shreyas B. Prabhu's avatar Shreyas B. Prabhu Committed by Michael Ellerman
Browse files

powerpc/powernv: abstraction for saving SPRs before entering deep idle states 



Create a function for saving SPRs before entering deep idle states.
This function can be reused for POWER9 deep idle states.

Reviewed-by: default avatarGautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: default avatarShreyas B. Prabhu <shreyas@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 4eae2c9a

arch/powerpc/kernel/idle_book3s.S

+32 −22
Original line number Diff line number Diff line
@@ -52,6 +52,36 @@ 


	.text



/*

 * Used by threads before entering deep idle states. Saves SPRs

 * in interrupt stack frame

 */

save_sprs_to_stack:

	/*

	 * Note all register i.e per-core, per-subcore or per-thread is saved

	 * here since any thread in the core might wake up first

	 */

	mfspr	r3,SPRN_SDR1

	std	r3,_SDR1(r1)

	mfspr	r3,SPRN_RPR

	std	r3,_RPR(r1)

	mfspr	r3,SPRN_SPURR

	std	r3,_SPURR(r1)

	mfspr	r3,SPRN_PURR

	std	r3,_PURR(r1)

	mfspr	r3,SPRN_TSCR

	std	r3,_TSCR(r1)

	mfspr	r3,SPRN_DSCR

	std	r3,_DSCR(r1)

	mfspr	r3,SPRN_AMOR

	std	r3,_AMOR(r1)

	mfspr	r3,SPRN_WORT

	std	r3,_WORT(r1)

	mfspr	r3,SPRN_WORC

	std	r3,_WORC(r1)



	blr



/*

 * Used by threads when the lock bit of core_idle_state is set.

 * Threads will spin in HMT_LOW until the lock bit is cleared.
@@ -209,28 +239,8 @@ fastsleep_workaround_at_entry: 
	b	common_enter



enter_winkle:

	/*

	 * Note all register i.e per-core, per-subcore or per-thread is saved

	 * here since any thread in the core might wake up first

	 */

	mfspr	r3,SPRN_SDR1

	std	r3,_SDR1(r1)

	mfspr	r3,SPRN_RPR

	std	r3,_RPR(r1)

	mfspr	r3,SPRN_SPURR

	std	r3,_SPURR(r1)

	mfspr	r3,SPRN_PURR

	std	r3,_PURR(r1)

	mfspr	r3,SPRN_TSCR

	std	r3,_TSCR(r1)

	mfspr	r3,SPRN_DSCR

	std	r3,_DSCR(r1)

	mfspr	r3,SPRN_AMOR

	std	r3,_AMOR(r1)

	mfspr	r3,SPRN_WORT

	std	r3,_WORT(r1)

	mfspr	r3,SPRN_WORC

	std	r3,_WORC(r1)

	bl	save_sprs_to_stack



	IDLE_STATE_ENTER_SEQ(PPC_WINKLE)



_GLOBAL(power7_idle)