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authorJoao Martins <joao.m.martins@oracle.com>2018-03-15 17:22:05 +0300
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2018-03-21 15:29:13 +0300
commit4d0f1ce6955913c490263359eadd392574cf9fe3 (patch)
tree4fc49d915e85b9c66764232442d93eba4aa7f4ec /include/acpi
parent36104cb9012a82e73c32a3b709257766b16bcd1d (diff)
downloadlinux-4d0f1ce6955913c490263359eadd392574cf9fe3.tar.xz
xen/acpi: upload _PSD info for non Dom0 CPUs too
All uploaded PM data from non-dom0 CPUs takes the info from vCPU 0 and changing only the acpi_id. For processors which P-state coordination type is HW_ALL (0xFD) it is OK to upload bogus P-state dependency information (_PSD), because Xen will ignore any cpufreq domains created for past CPUs. Albeit for platforms which expose coordination types as SW_ANY or SW_ALL, this will have some unintended side effects. Effectively, it will look at the P-state domain existence and *if it already exists* it will skip the acpi-cpufreq initialization and thus inherit the policy from the first CPU in the cpufreq domain. This will finally lead to the original cpu not changing target freq to P0 other than the first in the domain. Which will make turbo boost not getting enabled (e.g. for 'performance' governor) for all cpus. This patch fixes that, by also evaluating _PSD when we enumerate all ACPI processors and thus always uploading the correct info to Xen. We export acpi_processor_get_psd() for that this purpose, but change signature to not assume an existent of acpi_processor given that ACPI isn't creating an acpi_processor for non-dom0 CPUs. Signed-off-by: Joao Martins <joao.m.martins@oracle.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'include/acpi')
-rw-r--r--include/acpi/processor.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index d591bb77f592..40a916efd7c0 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -254,6 +254,8 @@ int acpi_processor_pstate_control(void);
/* note: this locks both the calling module and the processor module
if a _PPC object exists, rmmod is disallowed then */
int acpi_processor_notify_smm(struct module *calling_module);
+int acpi_processor_get_psd(acpi_handle handle,
+ struct acpi_psd_package *pdomain);
/* parsing the _P* objects. */
extern int acpi_processor_get_performance_info(struct acpi_processor *pr);