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MIPS: smp-cps: use CPC core-other locking

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The core which the CPC core-other region relates to is based upon the
core-local core-other addressing register. As its name suggests this
register is shared between all VPEs within a core, and if there is a
possibility that multiple VPEs within a core will attempt to access
another core simultaneously then locking is required. This wasn't
previously a problem with the only user being cpu0 during boot, but will
be an issue once hotplug is implemented & may race with other users such
as cpuidle.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
This commit is contained in:
Paul Burton 2014-03-07 10:42:52 +00:00
parent 0f4d3d1155
commit dd9233d047
1 changed files with 2 additions and 3 deletions
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5
arch/mips/kernel/smp-cps.c
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@ -161,11 +161,10 @@ static void boot_core(unsigned core)
write_gcr_access(access);
if (mips_cpc_present()) {
/* Select the appropriate core */
write_cpc_cl_other(core << CPC_Cx_OTHER_CORENUM_SHF);
/* Reset the core */
mips_cpc_lock_other(core);
write_cpc_co_cmd(CPC_Cx_CMD_RESET);
mips_cpc_unlock_other();
} else {
/* Take the core out of reset */
write_gcr_co_reset_release(0);