linux-kernel - [PATCH 3/7] x86/resctrl: Introduce sdciae_capable in rdt

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Message-ID: <cf9e47bbd66dbbdb76f0124620fad2f1b06e977e.1723824984.git.babu.moger@amd.com>
Date: Fri, 16 Aug 2024 11:16:20 -0500
From: Babu Moger <babu.moger@....com>
To: <corbet@....net>, <reinette.chatre@...el.com>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>,
	<x86@...nel.org>
CC: <fenghua.yu@...el.com>, <hpa@...or.com>, <paulmck@...nel.org>,
	<thuth@...hat.com>, <xiongwei.song@...driver.com>, <ardb@...nel.org>,
	<pawan.kumar.gupta@...ux.intel.com>, <daniel.sneddon@...ux.intel.com>,
	<sandipan.das@....com>, <kai.huang@...el.com>, <peterz@...radead.org>,
	<kan.liang@...ux.intel.com>, <pbonzini@...hat.com>, <xin3.li@...el.com>,
	<babu.moger@....com>, <ebiggers@...gle.com>, <alexandre.chartre@...cle.com>,
	<perry.yuan@....com>, <tan.shaopeng@...itsu.com>, <james.morse@....com>,
	<tony.luck@...el.com>, <maciej.wieczor-retman@...el.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<peternewman@...gle.com>, <eranian@...gle.com>
Subject: [PATCH 3/7] x86/resctrl: Introduce sdciae_capable in rdt_resource

Detect SDCIAE`(L3 Smart Data Cache Injection Allocation Enforcement)
feature and initialize sdciae_capable.

Signed-off-by: Babu Moger <babu.moger@....com>
---
 arch/x86/kernel/cpu/resctrl/core.c | 7 +++++++
 include/linux/resctrl.h            | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index c4dfc768ddf5..e4381e3feb75 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -296,6 +296,11 @@ static void rdt_get_cdp_config(int level)
 	rdt_resources_all[level].r_resctrl.cdp_capable = true;
 }
 
+static void rdt_get_sdciae_alloc_cfg(struct rdt_resource *r)
+{
+	r->sdciae_capable = true;
+}
+
 static void rdt_get_cdp_l3_config(void)
 {
 	rdt_get_cdp_config(RDT_RESOURCE_L3);
@@ -921,6 +926,8 @@ static __init bool get_rdt_alloc_resources(void)
 		rdt_get_cache_alloc_cfg(1, r);
 		if (rdt_cpu_has(X86_FEATURE_CDP_L3))
 			rdt_get_cdp_l3_config();
+		if (rdt_cpu_has(X86_FEATURE_SDCIAE))
+			rdt_get_sdciae_alloc_cfg(r);
 		ret = true;
 	}
 	if (rdt_cpu_has(X86_FEATURE_CAT_L2)) {
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index b0875b99e811..281ba4fb8972 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -202,6 +202,7 @@ enum resctrl_scope {
  * @evt_list:		List of monitoring events
  * @fflags:		flags to choose base and info files
  * @cdp_capable:	Is the CDP feature available on this resource
+ * @sdciae_capable:	Is SDCIAE feature available on this resource
  */
 struct rdt_resource {
 	int			rid;
@@ -224,6 +225,7 @@ struct rdt_resource {
 	struct list_head	evt_list;
 	unsigned long		fflags;
 	bool			cdp_capable;
+	bool			sdciae_capable;
 };
 
 /**
-- 
2.34.1