linux-kernel - [PATCH v2 14/17] x86/resctrl: Introduce mbm_total_cfg and mbm_local

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Message-ID: <a9648e33ea4893477350734995648c5820ee0e6a.1705688539.git.babu.moger@amd.com>
Date: Fri, 19 Jan 2024 12:22:16 -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 14/17] x86/resctrl: Introduce mbm_total_cfg and mbm_local_cfg

If the BMEC (Bandwidth Monitoring Event Configuration) feature is
supported, the bandwidth events can be configured to track specific events.
The event configuration is domain specific. ABMC (Assignable Bandwidth
Monitoring Counters) feature needs event configuration information to
assign RMID to the hardware counter. Currently, this information is not
available.

Save the event configuration information in the rdt_hw_domain, so it can
be used while for RMID assignment.

Signed-off-by: Babu Moger <babu.moger@....com>
---
v2: No changes.
---
 arch/x86/kernel/cpu/resctrl/core.c     |  2 ++
 arch/x86/kernel/cpu/resctrl/internal.h |  3 +++
 arch/x86/kernel/cpu/resctrl/monitor.c  | 11 +++++++++++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 11 +++++++++++
 4 files changed, 27 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index a38609c82b9e..e0ba43387afe 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -558,6 +558,8 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 		return;
 	}
 
+	arch_domain_mbm_evt_config(hw_dom);
+
 	list_add_tail(&d->list, add_pos);
 
 	err = resctrl_online_domain(r, d);
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 130854dc8b7f..e109c0388762 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -349,6 +349,8 @@ struct rdt_hw_domain {
 	u32				*ctrl_val;
 	struct arch_mbm_state		*arch_mbm_total;
 	struct arch_mbm_state		*arch_mbm_local;
+	u32				mbm_total_cfg;
+	u32                             mbm_local_cfg;
 };
 
 static inline struct rdt_hw_domain *resctrl_to_arch_dom(struct rdt_domain *r)
@@ -611,5 +613,6 @@ void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
 void __init resctrl_file_fflags_init(const char *config,
 				     unsigned long fflags);
 void rdt_staged_configs_clear(void);
+void arch_domain_mbm_evt_config(struct rdt_hw_domain *hw_dom);
 
 #endif /* _ASM_X86_RESCTRL_INTERNAL_H */
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index de43be2252cc..ec480015980c 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -854,3 +854,14 @@ void __init intel_rdt_mbm_apply_quirk(void)
 	mbm_cf_rmidthreshold = mbm_cf_table[cf_index].rmidthreshold;
 	mbm_cf = mbm_cf_table[cf_index].cf;
 }
+
+void arch_domain_mbm_evt_config(struct rdt_hw_domain *hw_dom)
+{
+	if (mbm_total_event.configurable)
+		hw_dom->mbm_total_cfg = MAX_EVT_CONFIG_BITS;
+
+	if (mbm_local_event.configurable)
+		hw_dom->mbm_local_cfg = READS_TO_LOCAL_MEM |
+					NON_TEMP_WRITE_TO_LOCAL_MEM |
+					READS_TO_LOCAL_S_MEM;
+}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 19b0ebf4f435..df8d2390fc69 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1719,6 +1719,7 @@ static void mon_event_config_write(void *info)
 static int mbm_config_write_domain(struct rdt_resource *r,
 				   struct rdt_domain *d, u32 evtid, u32 val)
 {
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
 	struct mon_config_info mon_info = {0};
 	int ret = 0;
 
@@ -1748,6 +1749,16 @@ static int mbm_config_write_domain(struct rdt_resource *r,
 	smp_call_function_any(&d->cpu_mask, mon_event_config_write,
 			      &mon_info, 1);
 
+	/*
+	 * Update event config value in the domain when user changes it.
+	 */
+	if (evtid == QOS_L3_MBM_TOTAL_EVENT_ID)
+		hw_dom->mbm_total_cfg = val;
+	else if (evtid == QOS_L3_MBM_LOCAL_EVENT_ID)
+		hw_dom->mbm_local_cfg = val;
+	else
+		goto out;
+
 	/*
 	 * When an Event Configuration is changed, the bandwidth counters
 	 * for all RMIDs and Events will be cleared by the hardware. The
-- 
2.34.1