linux-kernel - [PATCH 1/2] x86/resctrl: Add missing resctrl initialization for Hygon

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Message-ID: <20251204023750.994143-2-shenxiaochen@open-hieco.net>
Date: Thu,  4 Dec 2025 10:37:49 +0800
From: Xiaochen Shen <shenxiaochen@...n-hieco.net>
To: tony.luck@...el.com,
	reinette.chatre@...el.com,
	bp@...en8.de,
	fenghuay@...dia.com
Cc: babu.moger@....com,
	james.morse@....com,
	Dave.Martin@....com,
	x86@...nel.org,
	linux-kernel@...r.kernel.org,
	shenxiaochen@...n-hieco.net
Subject: [PATCH 1/2] 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")
Fixes: 923f3a2b48bd ("x86/resctrl: Query LLC monitoring properties once during boot")
Cc: stable@...r.kernel.org
Signed-off-by: Xiaochen Shen <shenxiaochen@...n-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 3792ab4819dc..10de1594d328 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();
 }
 
-- 
2.47.3