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target/ppc: Fix support for "STOP light" states on POWER9

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STOP must act differently based on PSSCR:EC on POWER9. When set, it
acts like the P7/P8 power management instructions and wake up at 0x100
based on the wakeup conditions in LPCR.

When PSSCR:EC is clear however it will wakeup at the next instruction
after STOP (if EE is clear) or take the corresponding interrupts (if
EE is set).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20190215161648.9600-4-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2019-02-15 17:16:41 +01:00 • committed by David Gibson
parent 3621e2c960
commit 21c0d66a9c
5 changed files with 35 additions and 6 deletions
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8
target/ppc/excp_helper.c
View file

@ -97,7 +97,10 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
asrr0 = -1;
asrr1 = -1;
/* check for special resume at 0x100 from doze/nap/sleep/winkle on P7/P8 */
/*
* check for special resume at 0x100 from doze/nap/sleep/winkle on
* P7/P8/P9
*/
if (env->in_pm_state) {
env->in_pm_state = false;
@ -960,7 +963,8 @@ void helper_pminsn(CPUPPCState *env, powerpc_pm_insn_t insn)
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_HDECR);
/* Condition for waking up at 0x100 */
env->in_pm_state = true;
env->in_pm_state = (insn != PPC_PM_STOP) ||
(env->spr[SPR_PSSCR] & PSSCR_EC);
}
#endif /* defined(TARGET_PPC64) */