linux-kernel - [RFC v2 20/26] mm/asi: Add option to map cpu_hw

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Date:   Thu, 11 Jul 2019 16:25:32 +0200
From:   Alexandre Chartre <alexandre.chartre@...cle.com>
To:     pbonzini@...hat.com, rkrcmar@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        kvm@...r.kernel.org, x86@...nel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     konrad.wilk@...cle.com, jan.setjeeilers@...cle.com,
        liran.alon@...cle.com, jwadams@...gle.com, graf@...zon.de,
        rppt@...ux.vnet.ibm.com, alexandre.chartre@...cle.com
Subject: [RFC v2 20/26] mm/asi: Add option to map cpu_hw_events

Add option to map cpu_hw_events in ASI pagetable. Also restructure
to select ptions for percpu optional mapping.

Signed-off-by: Alexandre Chartre <alexandre.chartre@...cle.com>
---
 arch/x86/include/asm/asi.h |    1 +
 arch/x86/mm/asi.c          |    3 +++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/asi.h b/arch/x86/include/asm/asi.h
index 8199618..f489551 100644
--- a/arch/x86/include/asm/asi.h
+++ b/arch/x86/include/asm/asi.h
@@ -19,6 +19,7 @@
 #define ASI_MAP_CPU_PTR		0x02	/* for get_cpu_var()/this_cpu_ptr() */
 #define ASI_MAP_CURRENT_TASK	0x04	/* map the current task */
 #define ASI_MAP_RCU_DATA	0x08	/* map rcu data */
+#define ASI_MAP_CPU_HW_EVENTS	0x10	/* map cpu hw events */
 
 enum page_table_level {
 	PGT_LEVEL_PTE,
diff --git a/arch/x86/mm/asi.c b/arch/x86/mm/asi.c
index 20c23dc..d488704 100644
--- a/arch/x86/mm/asi.c
+++ b/arch/x86/mm/asi.c
@@ -8,6 +8,7 @@
 #include <linux/export.h>
 #include <linux/gfp.h>
 #include <linux/irq_work.h>
+#include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/printk.h>
 #include <linux/sched/debug.h>
@@ -17,6 +18,7 @@
 #include <asm/bug.h>
 #include <asm/mmu_context.h>
 
+#include "../events/perf_event.h"
 #include "../../../kernel/rcu/tree.h"
 
 /* ASI sessions, one per cpu */
@@ -33,6 +35,7 @@ struct asi_map_option asi_map_percpu_options[] = {
 	{ ASI_MAP_CPU_PTR, &this_cpu_off, sizeof(this_cpu_off) },
 	{ ASI_MAP_CURRENT_TASK, &current_task, sizeof(current_task) },
 	{ ASI_MAP_RCU_DATA, &rcu_data, sizeof(rcu_data) },
+	{ ASI_MAP_CPU_HW_EVENTS, &cpu_hw_events, sizeof(cpu_hw_events) },
 };
 
 static void asi_log_fault(struct asi *asi, struct pt_regs *regs,
-- 
1.7.1