diff options
Diffstat (limited to 'arch/powerpc/platforms/powernv/subcore.c')
| -rw-r--r-- | arch/powerpc/platforms/powernv/subcore.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/subcore.c b/arch/powerpc/platforms/powernv/subcore.c index c87f96b79d1a..f60f80ada903 100644 --- a/arch/powerpc/platforms/powernv/subcore.c +++ b/arch/powerpc/platforms/powernv/subcore.c @@ -160,6 +160,18 @@ static void wait_for_sync_step(int step) mb(); } +static void update_hid_in_slw(u64 hid0) +{ + u64 idle_states = pnv_get_supported_cpuidle_states(); + + if (idle_states & OPAL_PM_WINKLE_ENABLED) { + /* OPAL call to patch slw with the new HID0 value */ + u64 cpu_pir = hard_smp_processor_id(); + + opal_slw_set_reg(cpu_pir, SPRN_HID0, hid0); + } +} + static void unsplit_core(void) { u64 hid0, mask; @@ -179,6 +191,7 @@ static void unsplit_core(void) hid0 = mfspr(SPRN_HID0); hid0 &= ~HID0_POWER8_DYNLPARDIS; mtspr(SPRN_HID0, hid0); + update_hid_in_slw(hid0); while (mfspr(SPRN_HID0) & mask) cpu_relax(); @@ -215,6 +228,7 @@ static void split_core(int new_mode) hid0 = mfspr(SPRN_HID0); hid0 |= HID0_POWER8_DYNLPARDIS | split_parms[i].value; mtspr(SPRN_HID0, hid0); + update_hid_in_slw(hid0); /* Wait for it to happen */ while (!(mfspr(SPRN_HID0) & split_parms[i].mask)) @@ -251,6 +265,25 @@ bool cpu_core_split_required(void) return true; } +void update_subcore_sibling_mask(void) +{ + int cpu; + /* + * sibling mask for the first cpu. Left shift this by required bits + * to get sibling mask for the rest of the cpus. + */ + int sibling_mask_first_cpu = (1 << threads_per_subcore) - 1; + + for_each_possible_cpu(cpu) { + int tid = cpu_thread_in_core(cpu); + int offset = (tid / threads_per_subcore) * threads_per_subcore; + int mask = sibling_mask_first_cpu << offset; + + paca[cpu].subcore_sibling_mask = mask; + + } +} + static int cpu_update_split_mode(void *data) { int cpu, new_mode = *(int *)data; @@ -284,6 +317,7 @@ static int cpu_update_split_mode(void *data) /* Make the new mode public */ subcores_per_core = new_mode; threads_per_subcore = threads_per_core / subcores_per_core; + update_subcore_sibling_mask(); /* Make sure the new mode is written before we exit */ mb(); |