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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Mar 2025 08:40:41.3776 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3d857b7f-ad88-440d-7a44-08dd5c8a93ff X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH1PEPF0000AD74.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR12MB6522 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1741251502589019100 Content-Type: text/plain; charset="utf-8" From: Penny Zheng amd-cppc on active mode bypasses the scaling governor layer, and provides its own P-state selection algorithms in hardware. Consequently, when it is used, the driver's -> setpolicy() callback is invoked to register per-CPU utilization update callbacks, not the ->target() callback. So, only when cpufreq_driver.setpolicy is NULL, we need to deliberately set old gov as NULL to trigger the according gov starting. Signed-off-by: Penny Zheng Reviewed-by: Jan Beulich --- xen/drivers/cpufreq/cpufreq.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/xen/drivers/cpufreq/cpufreq.c b/xen/drivers/cpufreq/cpufreq.c index 792e4dc02c..8fc6e527c2 100644 --- a/xen/drivers/cpufreq/cpufreq.c +++ b/xen/drivers/cpufreq/cpufreq.c @@ -353,7 +353,13 @@ int cpufreq_add_cpu(unsigned int cpu) if (hw_all || (cpumask_weight(cpufreq_dom->map) =3D=3D pmpt->domain_info.num_processors)) { memcpy(&new_policy, policy, sizeof(struct cpufreq_policy)); - policy->governor =3D NULL; + + /* + * Only when cpufreq_driver.setpolicy =3D=3D NULL, we need to delib= erately + * set old gov as NULL to trigger the according gov starting. + */ + if ( cpufreq_driver.setpolicy =3D=3D NULL ) + policy->governor =3D NULL; =20 cpufreq_cmdline_common_para(&new_policy); =20 --=20 2.34.1