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Current vexpress smp init code detects whether to override the default smp ops with MCPM smp ops by matching the "cci-400" compatible string, in that MCPM requires control over CCI ports to manage low-power states entry/exit. The "cci-400" compatible string check is a necessary but not sufficient condition for MCPM to work, because the cci-400 can be made visible to the kernel, but firmware can nonetheless disable non-secure CCI ports control, while still allowing PMU access; if booted in non-secure world, the kernel would still blindly override smp operations with MCPM operations, resulting in kernel faults when the CCI ports programming interface is accessed from non-secure world. This means that the "cci-400" compatible string check would result in a false positive in systems that eg boot in HYP mode, where CCI ports non-secure access is explicitly not allowed, and it is reported in the respective device tree nodes with CCI ports marked as disabled. Refactor the smp operations initialization to make sure that the kernel is actually allowed to take control over CCI ports (by enabling MCPM smp operations) before overriding default vexpress smp operations. Cc: Liviu Dudau <liviu.dudau@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org> Tested-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> |
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| .. | ||
| core.h | ||
| dcscb_setup.S | ||
| dcscb.c | ||
| hotplug.c | ||
| Kconfig | ||
| Makefile | ||
| Makefile.boot | ||
| platsmp.c | ||
| spc.c | ||
| spc.h | ||
| tc2_pm.c | ||
| v2m-mps2.c | ||
| v2m.c | ||