svn commit: r346063 - head/sys/dev/acpica

[Andriy Gapon]

On 09/04/2019 22:22, John Baldwin wrote:
> Author: jhb
> Date: Tue Apr  9 19:22:08 2019
> New Revision: 346063
> URL: https://svnweb.freebsd.org/changeset/base/346063
> 
> Log:
>   Don't pre-reserve resources for CPU devices when they are set.
>   
>   CPUs can use shared (RF_SHAREABLE) resources for the I/O port used for
>   entering and exiting C states.  If this I/O port is included in an ACPI
>   system resource device, then this happens to still work, but if the port
>   wasn't part of a system resource device, only the first CPU could allocate
>   the I/O port and use C states since resource_list_reserve() was always
>   allocating the resource from nexus0 without RF_SHAREABLE.  By avoiding
>   the reservation, the flags from the bus_alloc_resource() in the CPU driver
>   (which include RF_SHAREABLE) are honored.
>   
>   PR:		236513
>   Reported by:	stockhausen at collogia.de
>   Sleuthing by:	avg

Actually, 80-90% of it was done by the reporter.  I just pieced it together :)

>   Reviewed by:	avg
>   MFC after:	2 weeks


-- 
Andriy Gapon