usb: Fix H20AHB driver for big-endian

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
hmp: sched: Clean up hmp_up_threshold checks into a utility fn

In anticipation of modifying the up_threshold handling, make all
instances use the same utility fn to check if a task is eligible
for up-migration. This also removes the previous difference in
threshold comparison where up-migration used '!<threshold' and
idle pull used '>threshold' to decide up-migration eligibility.
Make them both use '!<threshold' instead for consistency, although
this is unlikely to change any results.

Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Signed-off-by: Jon Medhurst <tixy@linaro.org>
sched: hmp: unify active migration code

The HMP active migration code is functionally identical to the CFS
active migration code apart from one flag check. Share the code
and make the flag check optional.

Two wrapper functions allow the flag check to be present or not.

Thanks to tixy@linaro.org for pointing out the build break and a
good solution in an earlier version.

Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Signed-off-by: Jon Medhurst <tixy@linaro.org>
[ Rebased on top of 1.1-Juno-rc0 ]
Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
Signed-off-by: Juri Lelli <juri.lelli@arm.com>
hmp: Use idle pull to perform forced up-migrations

When a normal forced up-migration takes place we stop the task to
be migrated while the target CPU becomes available. This delay can
range from 80us to 1500us on TC2 if the target CPU is in a deep idle
state.

Instead, interrupt the target CPU and ask it to pull a task.
This lets the current eligible task continue executing on the
original CPU while the target CPU wakes. Use a pinned timer to
prevent the pulling CPU going back into power-down with pending
up-migrations.

If we trigger for a nohz kick, it doesn't matter about triggering
for an idle pull since the idle_pull flag will be set when we
execute the softirq and we'll still do the idle pull.

If the target CPU is busy, we will not pull any tasks.

Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Signed-off-by: Jon Medhurst <tixy@linaro.org>
[ Rebased on top of 1.1-Juno-rc0 ]
[ Add missing this_cpu in run_rebalance_domains() ]
Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
Signed-off-by: Juri Lelli <juri.lelli@arm.com>
hmp: dont attempt to pull tasks if affinity doesn't allow it

When looking for a task to be idle-pulled, don't consider tasks
where the affinity does not allow that task to be placed on the
target CPU. Also ensure that tasks with restricted affinity
do not block selecting other unrestricted busy tasks.

Use the knowledge of target CPU more effectively in idle pull
by passing to hmp_get_heaviest_task when we know it, otherwise
only checking for general affinity matches with any of the CPUs
in the bigger HMP domain.

We still need to explicitly check affinity is allowed in idle pull
since if we find no match in hmp_get_heaviest_task we will return
the current one, which may not be affine to the new CPU despite
having high enough load. In this case, there is nothing to move.

Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Signed-off-by: Jon Medhurst <tixy@linaro.org>
sched: hmp: Change small task packing defaults for all platforms

All platforms other than TC2 default to enabling packing. Since TC2
shows no performance or energy degradation with this feature enabled
make it default enabled the same as everyone else.
Likewise, vendors have been including TC2 support in multi-machine
kernel builds so they expect the default thresholds to remain the
same when the TC2 #ifdef is removed.

Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Signed-off-by: Jon Medhurst <tixy@linaro.org>