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c1e4659ba8
When secondary cpus are booted through the ACPI parking protocol, the booted cpu should check that FW has correctly cleared its mailbox entry point value to make sure the boot process was correctly executed. The entry point check is carried in the cpu_ops->cpu_postboot method, that is executed by secondary cpus when entering the kernel with irqs disabled. The ACPI parking protocol cpu_ops maps/unmaps the mailboxes on the primary CPU to trigger secondary boot in the cpu_ops->cpu_boot method and on secondary processors to carry out FW checks on the booted CPU to verify the boot protocol was successfully executed in the cpu_ops->cpu_postboot method. Therefore, the cpu_ops->cpu_postboot method is forced to ioremap/unmap the mailboxes, which is wrong in that ioremap cannot be safely be carried out with irqs disabled. To fix this issue, this patch reshuffles the code so that the mailboxes are still mapped after the boot processor executes the cpu_ops->cpu_boot method for a given cpu, and the VA at which a mailbox is mapped for a given cpu is stashed in the per-cpu data struct so that secondary cpus can retrieve them in the cpu_ops->cpu_postboot and complete the required FW checks. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reported-by: Itaru Kitayama <itaru.kitayama@riken.jp> Tested-by: Loc Ho <lho@apm.com> Tested-by: Itaru Kitayama <itaru.kitayama@riken.jp> Cc: Will Deacon <will.deacon@arm.com> Cc: Hanjun Guo <hanjun.guo@linaro.org> Cc: Loc Ho <lho@apm.com> Cc: Itaru Kitayama <itaru.kitayama@riken.jp> Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mark Salter <msalter@redhat.com> Cc: Al Stone <ahs3@redhat.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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