coresight: etm4x: add CPU hotplug support for probing
etm4x devices cannot be successfully probed when their CPU is offline. For example, when booting with maxcpus=n, ETM probing will fail on CPUs >n, and the probing won't be reattempted once the CPUs come online. This will leave those CPUs unable to make use of ETM. This change adds a mechanism to delay the probing if the corresponding CPU is offline, and to try it again when the CPU comes online. Signed-off-by: Tamas Zsoldos <tamas.zsoldos@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20220705145935.24679-1-tamas.zsoldos@arm.com
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