linux-kernel - [PATCH v2 3/7] x86/resctrl: Detect Smart Data Cache Injection Allocation Enforcement

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Message-ID: <ffcbf189201c4b79b91a2f94cfe219acdab807d5.1734556832.git.babu.moger@amd.com>
Date: Wed, 18 Dec 2024 15:37:59 -0600
From: Babu Moger <babu.moger@....com>
To: <reinette.chatre@...el.com>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<bp@...en8.de>, <dave.hansen@...ux.intel.com>
CC: <babu.moger@....com>, <fenghua.yu@...el.com>, <x86@...nel.org>,
	<hpa@...or.com>, <akpm@...ux-foundation.org>, <paulmck@...nel.org>,
	<thuth@...hat.com>, <rostedt@...dmis.org>, <xiongwei.song@...driver.com>,
	<pawan.kumar.gupta@...ux.intel.com>, <jpoimboe@...nel.org>,
	<daniel.sneddon@...ux.intel.com>, <thomas.lendacky@....com>,
	<perry.yuan@....com>, <sandipan.das@....com>, <kai.huang@...el.com>,
	<seanjc@...gle.com>, <xin3.li@...el.com>, <ebiggers@...gle.com>,
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	<tan.shaopeng@...itsu.com>, <james.morse@....com>, <tony.luck@...el.com>,
	<peternewman@...gle.com>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <eranian@...gle.com>, <corbet@....net>
Subject: [PATCH v2 3/7] x86/resctrl: Detect Smart Data Cache Injection Allocation Enforcement

Introduce io_alloc_capable in struct resctrl_cache to detect SDCIAE
(L3 Smart Data Cache Injection Allocation Enforcement) feature.

Signed-off-by: Babu Moger <babu.moger@....com>
---
v2: Changed sdciae_capable to io_alloc_capable to make it generic feature.
    Also moved the io_alloc_capable in struct resctrl_cache.
---
 arch/x86/kernel/cpu/resctrl/core.c | 7 +++++++
 include/linux/resctrl.h            | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index c2450cd52511..39e110033d96 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -306,6 +306,11 @@ 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->cache.io_alloc_capable = true;
+}
+
 static void rdt_get_cdp_l3_config(void)
 {
 	rdt_get_cdp_config(RDT_RESOURCE_L3);
@@ -931,6 +936,8 @@ 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 d94abba1c716..5837acff7442 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -129,6 +129,8 @@ struct rdt_mon_domain {
  * @arch_has_sparse_bitmasks:	True if a bitmask like f00f is valid.
  * @arch_has_per_cpu_cfg:	True if QOS_CFG register for this cache
  *				level has CPU scope.
+ * @io_alloc_capable:	Smart Data Cache Injection Allocation Enforcement
+ *			capable (SDCIAE).
  */
 struct resctrl_cache {
 	unsigned int	cbm_len;
@@ -136,6 +138,7 @@ struct resctrl_cache {
 	unsigned int	shareable_bits;
 	bool		arch_has_sparse_bitmasks;
 	bool		arch_has_per_cpu_cfg;
+	bool		io_alloc_capable;
 };
 
 /**
@@ -202,6 +205,7 @@ 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;
-- 
2.34.1