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powerpc/powernv/idle: add a basic stop 0-3 driver for POWER10

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This driver does not restore stop > 3 state, so it limits itself
to states which do not lose full state or TB.

The POWER10 SPRs are sufficiently different from P9 that it seems
easier to split out the P10 code. The POWER10 deep sleep code
(e.g., the BHRB restore) has been taken out, but it can be re-added
when stop > 3 support is added.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Tested-by: Pratik Rajesh Sampat<psampat@linux.ibm.com>
Tested-by: Vaidyanathan Srinivasan <svaidy@linux.ibm.com>
Reviewed-by: Pratik Rajesh Sampat<psampat@linux.ibm.com>
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200819094700.493399-1-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin
2020-08-19 19:47:00 +10:00
committed by Michael Ellerman
parent 79b123cdf9
commit ffd2961bb4
5 changed files with 212 additions and 97 deletions
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arch/powerpc/include/asm/processor.h
+1 -1
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@@ -432,7 +432,7 @@ enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
extern int powersave_nap; /* set if nap mode can be used in idle loop */
extern void power7_idle_type(unsigned long type);
extern void power9_idle_type(unsigned long stop_psscr_val,
extern void arch300_idle_type(unsigned long stop_psscr_val,
unsigned long stop_psscr_mask);
extern int fix_alignment(struct pt_regs *);