From bd00a240dc52e28706fbbe3aceda63e6c291b433 Mon Sep 17 00:00:00 2001 From: "Gautham R. Shenoy" Date: Wed, 7 Sep 2016 10:46:30 +0530 Subject: [PATCH] powerpc/powernv: Fix restore of SPRs upon wake up from hypervisor state loss pnv_wakeup_tb_loss() currently expects cr4 to be "eq" if the CPU is waking up from a complete hypervisor state loss. Hence, it currently restores the SPR contents only if cr4 is "eq". However, after commit bcef83a00dc4 ("powerpc/powernv: Add platform support for stop instruction"), on ISA v3.0 CPUs, the function pnv_restore_hyp_resource() sets cr4 to contain the result of the comparison between the state the CPU has woken up from and the first deep stop state before calling pnv_wakeup_tb_loss(). Thus if the CPU woke up from a state that is deeper than the first deep stop state, cr4 will have "gt" set and hence, pnv_wakeup_tb_loss() will fail to restore the SPRs on waking up from such a state. Fix the code in pnv_wakeup_tb_loss() to restore the SPR states when cr4 is "eq" or "gt". Fixes: bcef83a00dc4 ("powerpc/powernv: Add platform support for stop instruction") Signed-off-by: Gautham R. Shenoy Reviewed-by: Shreyas B. Prabhu Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/idle_book3s.S | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S index 2265c6398a17..bd739fed26e3 100644 --- a/arch/powerpc/kernel/idle_book3s.S +++ b/arch/powerpc/kernel/idle_book3s.S @@ -411,7 +411,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) * * r13 - PACA * cr3 - gt if waking up with partial/complete hypervisor state loss - * cr4 - eq if waking up from complete hypervisor state loss. + * cr4 - gt or eq if waking up from complete hypervisor state loss. */ _GLOBAL(pnv_wakeup_tb_loss) ld r1,PACAR1(r13) @@ -453,7 +453,7 @@ lwarx_loop2: * At this stage * cr2 - eq if first thread to wakeup in core * cr3- gt if waking up with partial/complete hypervisor state loss - * cr4 - eq if waking up from complete hypervisor state loss. + * cr4 - gt or eq if waking up from complete hypervisor state loss. */ ori r15,r15,PNV_CORE_IDLE_LOCK_BIT @@ -481,7 +481,7 @@ first_thread_in_subcore: * If waking up from sleep, subcore state is not lost. Hence * skip subcore state restore */ - bne cr4,subcore_state_restored + blt cr4,subcore_state_restored /* Restore per-subcore state */ ld r4,_SDR1(r1) @@ -526,7 +526,7 @@ timebase_resync: * If waking up from sleep, per core state is not lost, skip to * clear_lock. */ - bne cr4,clear_lock + blt cr4,clear_lock /* * First thread in the core to wake up and its waking up with @@ -557,7 +557,7 @@ common_exit: * If waking up from sleep, hypervisor state is not lost. Hence * skip hypervisor state restore. */ - bne cr4,hypervisor_state_restored + blt cr4,hypervisor_state_restored /* Waking up from winkle */