linux-kernel - [RFC PATCH 09/19] x86/resctrl: Add plza_capable in rdt

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Message-ID: <7b7507eac245988473e7b769a559bd193321e046.1769029977.git.babu.moger@amd.com>
Date: Wed, 21 Jan 2026 15:12:47 -0600
From: Babu Moger <babu.moger@....com>
To: <corbet@....net>, <tony.luck@...el.com>, <reinette.chatre@...el.com>,
	<Dave.Martin@....com>, <james.morse@....com>, <babu.moger@....com>,
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	<dave.hansen@...ux.intel.com>
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Subject: [RFC PATCH 09/19] x86/resctrl: Add plza_capable in rdt_resource data structure

Add plza_capable field to the rdt_resource structure to indicate whether
Privilege Level Zero Association (PLZA) is supported for that resource
type.

Signed-off-by: Babu Moger <babu.moger@....com>
---
 arch/x86/kernel/cpu/resctrl/core.c     | 6 ++++++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 5 +++++
 include/linux/resctrl.h                | 3 +++
 3 files changed, 14 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 2de3140dd6d1..e41fe5fa3f30 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -295,6 +295,9 @@ static __init bool __rdt_get_mem_config_amd(struct rdt_resource *r)
 
 	r->alloc_capable = true;
 
+	if (rdt_cpu_has(X86_FEATURE_PLZA))
+		r->plza_capable = true;
+
 	return true;
 }
 
@@ -314,6 +317,9 @@ static void rdt_get_cache_alloc_cfg(int idx, struct rdt_resource *r)
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
 		r->cache.arch_has_sparse_bitmasks = ecx.split.noncont;
 	r->alloc_capable = true;
+
+	if (rdt_cpu_has(X86_FEATURE_PLZA))
+		r->plza_capable = true;
 }
 
 static void rdt_get_cdp_config(int level)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 885026468440..540e1e719d7f 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -229,6 +229,11 @@ bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
 	return rdt_resources_all[l].cdp_enabled;
 }
 
+bool resctrl_arch_get_plza_capable(enum resctrl_res_level l)
+{
+	return rdt_resources_all[l].r_resctrl.plza_capable;
+}
+
 void resctrl_arch_reset_all_ctrls(struct rdt_resource *r)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 63d74c0dbb8f..ae252a0e6d92 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -319,6 +319,7 @@ struct resctrl_mon {
  * @name:		Name to use in "schemata" file.
  * @schema_fmt:		Which format string and parser is used for this schema.
  * @cdp_capable:	Is the CDP feature available on this resource
+ * @plza_capable:	Is Privilege Level Zero Association capable?
  */
 struct rdt_resource {
 	int			rid;
@@ -334,6 +335,7 @@ struct rdt_resource {
 	char			*name;
 	enum resctrl_schema_fmt	schema_fmt;
 	bool			cdp_capable;
+	bool			plza_capable;
 };
 
 /*
@@ -481,6 +483,7 @@ static inline u32 resctrl_get_config_index(u32 closid,
 
 bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l);
 int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
+bool resctrl_arch_get_plza_capable(enum resctrl_res_level l);
 
 /**
  * resctrl_arch_mbm_cntr_assign_enabled() - Check if MBM counter assignment
-- 
2.34.1