linux-kernel - [tip: x86/urgent] x86/resctrl: Add missing resctrl initialization for Hygon

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Message-ID: <176832084042.510.2796952283536723674.tip-bot2@tip-bot2>
Date: Tue, 13 Jan 2026 16:14:00 -0000
From: "tip-bot2 for Xiaochen Shen" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Xiaochen Shen <shenxiaochen@...n-hieco.net>,
 "Borislav Petkov (AMD)" <bp@...en8.de>,
 Reinette Chatre <reinette.chatre@...el.com>, stable@...r.kernel.org,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject:
 [tip: x86/urgent] x86/resctrl: Add missing resctrl initialization for Hygon

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     6ee98aabdc700b5705e4f1833e2edc82a826b53b
Gitweb:        https://git.kernel.org/tip/6ee98aabdc700b5705e4f1833e2edc82a826b53b
Author:        Xiaochen Shen <shenxiaochen@...n-hieco.net>
AuthorDate:    Tue, 09 Dec 2025 14:26:49 +08:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Tue, 13 Jan 2026 16:20:01 +01:00

x86/resctrl: Add missing resctrl initialization for Hygon

Hygon CPUs supporting Platform QoS features currently undergo partial resctrl
initialization through resctrl_cpu_detect() in the Hygon BSP init helper and
AMD/Hygon common initialization code. However, several critical data
structures remain uninitialized for Hygon CPUs in the following paths:

 - get_mem_config()-> __rdt_get_mem_config_amd():
     rdt_resource::membw,alloc_capable
     hw_res::num_closid

 - rdt_init_res_defs()->rdt_init_res_defs_amd():
     rdt_resource::cache
     hw_res::msr_base,msr_update

Add the missing AMD/Hygon common initialization to ensure proper Platform QoS
functionality on Hygon CPUs.

Fixes: d8df126349da ("x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper")
Signed-off-by: Xiaochen Shen <shenxiaochen@...n-hieco.net>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Cc: stable@...r.kernel.org
Link: https://patch.msgid.link/20251209062650.1536952-2-shenxiaochen@open-hieco.net
---
 arch/x86/kernel/cpu/resctrl/core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 3792ab4..10de159 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -825,7 +825,8 @@ static __init bool get_mem_config(void)
 
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
 		return __get_mem_config_intel(&hw_res->r_resctrl);
-	else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+	else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
+		 boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
 		return __rdt_get_mem_config_amd(&hw_res->r_resctrl);
 
 	return false;
@@ -987,7 +988,8 @@ static __init void rdt_init_res_defs(void)
 {
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
 		rdt_init_res_defs_intel();
-	else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+	else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
+		 boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
 		rdt_init_res_defs_amd();
 }