diff options
| author | Ingo Molnar <[email protected]> | 2017-08-26 09:19:13 +0200 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2017-08-26 09:19:13 +0200 |
| commit | 413d63d71b222108d19703f3fd5cf9108652a730 (patch) | |
| tree | 4680de6aebb6430dc5f3d9327f86d65149e6b5ae /arch/powerpc/kernel/idle_book3s.S | |
| parent | d6c8103b0265d8db30e20e948a4f06382bbdaea7 (diff) | |
| parent | 90a6cd503982bfd33ce8c70eb49bd2dd33bc6325 (diff) | |
Merge branch 'linus' into x86/mm to pick up fixes and to fix conflicts
Conflicts:
arch/x86/kernel/head64.c
arch/x86/mm/mmap.c
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'arch/powerpc/kernel/idle_book3s.S')
| -rw-r--r-- | arch/powerpc/kernel/idle_book3s.S | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S index 5adb390e773b..e6252c5a57a4 100644 --- a/arch/powerpc/kernel/idle_book3s.S +++ b/arch/powerpc/kernel/idle_book3s.S @@ -30,6 +30,7 @@ * Use unused space in the interrupt stack to save and restore * registers for winkle support. */ +#define _MMCR0 GPR0 #define _SDR1 GPR3 #define _PTCR GPR3 #define _RPR GPR4 @@ -272,6 +273,14 @@ power_enter_stop: b pnv_wakeup_noloss .Lhandle_esl_ec_set: + /* + * POWER9 DD2 can incorrectly set PMAO when waking up after a + * state-loss idle. Saving and restoring MMCR0 over idle is a + * workaround. + */ + mfspr r4,SPRN_MMCR0 + std r4,_MMCR0(r1) + /* * Check if the requested state is a deep idle state. */ @@ -450,10 +459,20 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300) pnv_restore_hyp_resource_arch300: /* * Workaround for POWER9, if we lost resources, the ERAT - * might have been mixed up and needs flushing. + * might have been mixed up and needs flushing. We also need + * to reload MMCR0 (see comment above). We also need to set + * then clear bit 60 in MMCRA to ensure the PMU starts running. */ blt cr3,1f PPC_INVALIDATE_ERAT + ld r1,PACAR1(r13) + mfspr r4,SPRN_MMCRA + ori r4,r4,(1 << (63-60)) + mtspr SPRN_MMCRA,r4 + xori r4,r4,(1 << (63-60)) + mtspr SPRN_MMCRA,r4 + ld r4,_MMCR0(r1) + mtspr SPRN_MMCR0,r4 1: /* * POWER ISA 3. Use PSSCR to determine if we |