linux-kernel - [PATCH v2 13/17] x86/resctrl: Add data structures for ABMC assignment

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Date: Fri, 19 Jan 2024 12:22:15 -0600
From: Babu Moger <babu.moger@....com>
To: <corbet@....net>, <fenghua.yu@...el.com>, <reinette.chatre@...el.com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
	<rdunlap@...radead.org>, <tj@...nel.org>, <peterz@...radead.org>,
	<yanjiewtw@...il.com>, <babu.moger@....com>, <kim.phillips@....com>,
	<lukas.bulwahn@...il.com>, <seanjc@...gle.com>, <jmattson@...gle.com>,
	<leitao@...ian.org>, <jpoimboe@...nel.org>, <rick.p.edgecombe@...el.com>,
	<kirill.shutemov@...ux.intel.com>, <jithu.joseph@...el.com>,
	<kai.huang@...el.com>, <kan.liang@...ux.intel.com>,
	<daniel.sneddon@...ux.intel.com>, <pbonzini@...hat.com>,
	<sandipan.das@....com>, <ilpo.jarvinen@...ux.intel.com>,
	<peternewman@...gle.com>, <maciej.wieczor-retman@...el.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<eranian@...gle.com>
Subject: [PATCH v2 13/17] x86/resctrl: Add data structures for ABMC assignment

ABMC (Bandwidth Monitoring Event Configuration) counters can be configured
by writing to L3_QOS_ABMC_CFG MSR. When ABMC is enabled, the user can
configure a counter by writing to L3_QOS_ABMC_CFG setting the CfgEn field
while specifying the Bandwidth Source, Bandwidth Types, and Counter
Identifier. Add the MSR definition and individual field definitions.

MSR L3_QOS_ABMC_CFG (C000_03FDh) definitions.

==========================================================================
Bits 	Mnemonic	Description		Access Type   Reset Value
==========================================================================
63 	CfgEn 		Configuration Enable 	R/W 		0

62 	CtrEn 		Counter Enable 		R/W 		0

61:53 	– 		Reserved 		MBZ 		0

52:48 	CtrID 		Counter Identifier	R/W		0

47 	IsCOS		BwSrc field is a COS	R/W		0
			(not an RMID) R/W 0

46:44 	–		Reserved		MBZ		0

43:32	BwSrc		Bandwidth Source	R/W		0
			(RMID or COS)

31:0	BwType		Bandwidth types to	R/W		0
			track for this counter
==========================================================================

The feature details are documentd in the APM listed below [1].
[1] AMD64 Architecture Programmer's Manual Volume 2: System Programming
Publication # 24593 Revision 3.41 section 19.3.3.3 Assignable Bandwidth
Monitoring (ABMC).

Signed-off-by: Babu Moger <babu.moger@....com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537
---
v2: No changes.
---
 arch/x86/include/asm/msr-index.h       |  1 +
 arch/x86/kernel/cpu/resctrl/internal.h | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index ac0ce88a5978..148c2b8a2264 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -1127,6 +1127,7 @@
 #define MSR_IA32_SMBA_BW_BASE		0xc0000280
 #define MSR_IA32_EVT_CFG_BASE		0xc0000400
 #define MSR_IA32_L3_QOS_EXT_CFG		0xc00003ff
+#define MSR_IA32_L3_QOS_ABMC_CFG	0xc00003fd
 
 /* MSR_IA32_VMX_MISC bits */
 #define MSR_IA32_VMX_MISC_INTEL_PT                 (1ULL << 14)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 865101c5e1c2..130854dc8b7f 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -63,6 +63,9 @@
 #define TOTAL_ASSIGN			BIT(0)
 #define LOCAL_ASSIGN			BIT(1)
 
+/* Maximum assignable counters per resctrl group */
+#define ABMC_MAX_CTR_PER_GROUP		2
+
 struct rdt_fs_context {
 	struct kernfs_fs_context	kfc;
 	bool				enable_cdpl2;
@@ -170,6 +173,7 @@ enum rdtgrp_mode {
  * @crdtgrp_list:		child rdtgroup node list
  * @rmid:			rmid for this rdtgroup
  * @monitor_state:		Assignment state of the group
+ * @abmc_ctr_id:		ABMC counterids assigned to this group
  */
 struct mongroup {
 	struct kernfs_node	*mon_data_kn;
@@ -177,6 +181,7 @@ struct mongroup {
 	struct list_head	crdtgrp_list;
 	u32			rmid;
 	u32			monitor_state;
+	u32			abmc_ctr_id[ABMC_MAX_CTR_PER_GROUP];
 };
 
 /**
@@ -532,6 +537,24 @@ union cpuid_0x10_x_edx {
 	unsigned int full;
 };
 
+/*
+ * L3_QOS_ABMC_CFG MSR details. ABMC counters can be configured
+ * by writing to L3_QOS_ABMC_CFG.
+ */
+union l3_qos_abmc_cfg {
+	struct {
+		unsigned long  bw_type	:32,
+			       bw_src	:12,
+			       rsvrd1	: 3,
+			       is_cos	: 1,
+			       ctr_id	: 5,
+			       rsvrd	: 9,
+			       ctr_en	: 1,
+			       cfg_en	: 1;
+	} split;
+	unsigned long full;
+};
+
 void rdt_last_cmd_clear(void);
 void rdt_last_cmd_puts(const char *s);
 __printf(1, 2)
-- 
2.34.1