From 3e188b1ae8807f26cc5a530a9d55f3f643fe050a Mon Sep 17 00:00:00 2001
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Date: Thu, 12 Aug 2021 18:58:30 +0530
Subject: [PATCH] powerpc/book3s64/radix: make tlb_single_page_flush_ceiling a
 debugfs entry

References: bsc#1195183 ltc#193865
Patch-mainline: v5.15-rc1
Git-commit: 3e188b1ae8807f26cc5a530a9d55f3f643fe050a

Similar to x86/s390 add a debugfs file to tune tlb_single_page_flush_ceiling.
Also add a debugfs entry for tlb_local_single_page_flush_ceiling.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210812132831.233794-1-aneesh.kumar@linux.ibm.com
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
 arch/powerpc/mm/book3s64/radix_tlb.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/radix_tlb.c b/arch/powerpc/mm/book3s64/radix_tlb.c
index aefc100d79a7..1fa2bc6a969e 100644
--- a/arch/powerpc/mm/book3s64/radix_tlb.c
+++ b/arch/powerpc/mm/book3s64/radix_tlb.c
@@ -17,6 +17,7 @@
 #include <asm/trace.h>
 #include <asm/cputhreads.h>
 #include <asm/plpar_wrappers.h>
+#include <asm/debugfs.h>
 
 #include "internal.h"
 
@@ -1106,8 +1107,8 @@ EXPORT_SYMBOL(radix__flush_tlb_kernel_range);
  * invalidating a full PID, so it has a far lower threshold to change from
  * individual page flushes to full-pid flushes.
  */
-static unsigned long tlb_single_page_flush_ceiling __read_mostly = 33;
-static unsigned long tlb_local_single_page_flush_ceiling __read_mostly = POWER9_TLB_SETS_RADIX * 2;
+static u32 tlb_single_page_flush_ceiling __read_mostly = 33;
+static u32 tlb_local_single_page_flush_ceiling __read_mostly = POWER9_TLB_SETS_RADIX * 2;
 
 static inline void __radix__flush_tlb_range(struct mm_struct *mm,
 					    unsigned long start, unsigned long end)
@@ -1524,3 +1525,14 @@ void do_h_rpt_invalidate_prt(unsigned long pid, unsigned long lpid,
 EXPORT_SYMBOL_GPL(do_h_rpt_invalidate_prt);
 
 #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
+
+static int __init create_tlb_single_page_flush_ceiling(void)
+{
+	debugfs_create_u32("tlb_single_page_flush_ceiling", 0600,
+			   powerpc_debugfs_root, &tlb_single_page_flush_ceiling);
+	debugfs_create_u32("tlb_local_single_page_flush_ceiling", 0600,
+			   powerpc_debugfs_root, &tlb_local_single_page_flush_ceiling);
+	return 0;
+}
+late_initcall(create_tlb_single_page_flush_ceiling);
+
-- 
2.31.1