linux-kernel - [PATCH v7 21/24] x86/resctrl: Configure mbm_cntr

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Message-ID: <d5687ef178320866b823445176b10a411e0e5ede.1725488488.git.babu.moger@amd.com>
Date: Wed, 4 Sep 2024 17:21:36 -0500
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>, <james.morse@....com>
Subject: [PATCH v7 21/24] x86/resctrl: Configure mbm_cntr_assign mode if supported

Configure mbm_cntr_assign on AMD.

'mbm_cntr_assign' mode in AMD is ABMC (Assignable Bandwidth Monitoring
Counters). When the ABMC is updated, it must be updated on all logical
processors in the resctrl domain.

Signed-off-by: Babu Moger <babu.moger@....com>
---
v7: Introduced resctrl_arch_mbm_cntr_assign_configure() to configure.
    Moved the default settings to rdt_get_mon_l3_config(). It should be
    done before the hotplug handler is called. It cannot be done at
    rdtgroup_init().

v6: Keeping the default enablement in arch init code for now.
     This may need some discussion.
     Renamed resctrl_arch_configure_abmc to resctrl_arch_mbm_cntr_assign_configure.

v5: New patch to enable ABMC by default.
---
 arch/x86/kernel/cpu/resctrl/internal.h |  1 +
 arch/x86/kernel/cpu/resctrl/monitor.c  |  1 +
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 11 +++++++++++
 3 files changed, 13 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 9a65a13ccbe9..3250561f0187 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -709,6 +709,7 @@ int rdtgroup_assign_cntr(struct rdt_resource *r, struct rdtgroup *rdtgrp,
 			 struct rdt_mon_domain *d, enum resctrl_event_id evtid);
 int rdtgroup_unassign_cntr(struct rdt_resource *r, struct rdtgroup *rdtgrp,
 			   struct rdt_mon_domain *d, enum resctrl_event_id evtid);
+void resctrl_arch_mbm_cntr_assign_configure(struct rdt_resource *r);
 void rdt_staged_configs_clear(void);
 bool closid_allocated(unsigned int closid);
 int resctrl_find_cleanest_closid(void);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 09b1d8bb0aa0..314c0b297470 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1261,6 +1261,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 			cpuid_count(0x80000020, 5, &eax, &ebx, &ecx, &edx);
 			r->mon.num_mbm_cntrs = (ebx & 0xFFFF) + 1;
 			resctrl_file_fflags_init("num_mbm_cntrs", RFTYPE_MON_INFO);
+			hw_res->mbm_cntr_assign_enabled = true;
 		}
 	}
 
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 7a8ece12d7da..1054583bef9d 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2726,6 +2726,13 @@ int resctrl_arch_mbm_cntr_assign_set(struct rdt_resource *r, bool enable)
 	return 0;
 }
 
+void resctrl_arch_mbm_cntr_assign_configure(struct rdt_resource *r)
+{
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+
+	resctrl_abmc_set_one_amd(&hw_res->mbm_cntr_assign_enabled);
+}
+
 /*
  * We don't allow rdtgroup directories to be created anywhere
  * except the root directory. Thus when looking for the rdtgroup
@@ -4510,9 +4517,13 @@ int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d)
 
 void resctrl_online_cpu(unsigned int cpu)
 {
+	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+
 	mutex_lock(&rdtgroup_mutex);
 	/* The CPU is set in default rdtgroup after online. */
 	cpumask_set_cpu(cpu, &rdtgroup_default.cpu_mask);
+	if (r->mon.mbm_cntr_assignable)
+		resctrl_arch_mbm_cntr_assign_configure(r);
 	mutex_unlock(&rdtgroup_mutex);
 }
 
-- 
2.34.1