From: Gautham R. Shenoy ego@linux.vnet.ibm.com
[ Upstream commit 50741b70b0cbbafbd9199f5180e66c0c53783a4a ]
Commit d947fb4c965c ("cpuidle: pseries: Fixup exit latency for CEDE(0)") sets the exit latency of CEDE(0) based on the latency values of the Extended CEDE states advertised by the platform
On POWER9 LPARs, the firmwares advertise a very low value of 2us for CEDE1 exit latency on a Dedicated LPAR. The latency advertized by the PHYP hypervisor corresponds to the latency required to wakeup from the underlying hardware idle state. However the wakeup latency from the LPAR perspective should include
1. The time taken to transition the CPU from the Hypervisor into the LPAR post wakeup from platform idle state
2. Time taken to send the IPI from the source CPU (waker) to the idle target CPU (wakee).
1. can be measured via timer idle test, where we queue a timer, say for 1ms, and enter the CEDE state. When the timer fires, in the timer handler we compute how much extra timer over the expected 1ms have we consumed. On a a POWER9 LPAR the numbers are
CEDE latency measured using a timer (numbers in ns) N Min Median Avg 90%ile 99%ile Max Stddev 400 2601 5677 5668.74 5917 6413 9299 455.01
1. and 2. combined can be determined by an IPI latency test where we send an IPI to an idle CPU and in the handler compute the time difference between when the IPI was sent and when the handler ran. We see the following numbers on POWER9 LPAR.
CEDE latency measured using an IPI (numbers in ns) N Min Median Avg 90%ile 99%ile Max Stddev 400 711 7564 7369.43 8559 9514 9698 1200.01
Suppose, we consider the 99th percentile latency value measured using the IPI to be the wakeup latency, the value would be 9.5us This is in the ballpark of the default value of 10us.
Hence, use the exit latency of CEDE(0) based on the latency values advertized by platform only from POWER10 onwards. The values advertized on POWER10 platforms is more realistic and informed by the latency measurements. For earlier platforms stick to the default value of 10us. The fix was suggested by Michael Ellerman.
Fixes: d947fb4c965c ("cpuidle: pseries: Fixup exit latency for CEDE(0)") Reported-by: Enrico Joedecke joedecke@de.ibm.com Signed-off-by: Gautham R. Shenoy ego@linux.vnet.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/1626676399-15975-2-git-send-email-ego@linux.vnet.i... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/cpuidle/cpuidle-pseries.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/cpuidle/cpuidle-pseries.c b/drivers/cpuidle/cpuidle-pseries.c index a2b5c6f60cf0..e592280d8acf 100644 --- a/drivers/cpuidle/cpuidle-pseries.c +++ b/drivers/cpuidle/cpuidle-pseries.c @@ -419,7 +419,21 @@ static int pseries_idle_probe(void) cpuidle_state_table = shared_states; max_idle_state = ARRAY_SIZE(shared_states); } else { - fixup_cede0_latency(); + /* + * Use firmware provided latency values + * starting with POWER10 platforms. In the + * case that we are running on a POWER10 + * platform but in an earlier compat mode, we + * can still use the firmware provided values. + * + * However, on platforms prior to POWER10, we + * cannot rely on the accuracy of the firmware + * provided latency values. On such platforms, + * go with the conservative default estimate + * of 10us. + */ + if (cpu_has_feature(CPU_FTR_ARCH_31) || pvr_version_is(PVR_POWER10)) + fixup_cede0_latency(); cpuidle_state_table = dedicated_states; max_idle_state = NR_DEDICATED_STATES; }