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From: "Cédric Le Goater" <clg@kaod.org>
To: <linuxppc-dev@lists.ozlabs.org>
Cc: "Cédric Le Goater" <clg@kaod.org>
Subject: [PATCH 10/11] powerpc/xive: Add a debugfs toggle for save-restore
Date: Fri, 5 Nov 2021 11:26:35 +0100	[thread overview]
Message-ID: <20211105102636.1016378-11-clg@kaod.org> (raw)
In-Reply-To: <20211105102636.1016378-1-clg@kaod.org>

On POWER10, the automatic "save & restore" of interrupt context is
always available. Provide a way to deactivate it for tests or
performance.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 arch/powerpc/sysdev/xive/xive-internal.h | 1 +
 arch/powerpc/sysdev/xive/common.c        | 1 +
 arch/powerpc/sysdev/xive/native.c        | 2 +-
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/sysdev/xive/xive-internal.h b/arch/powerpc/sysdev/xive/xive-internal.h
index 504e7edce358..e0941bc64430 100644
--- a/arch/powerpc/sysdev/xive/xive-internal.h
+++ b/arch/powerpc/sysdev/xive/xive-internal.h
@@ -72,5 +72,6 @@ static inline u32 xive_alloc_order(u32 queue_shift)
 }
 
 extern bool xive_cmdline_disabled;
+extern bool xive_has_save_restore;
 
 #endif /*  __XIVE_INTERNAL_H */
diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c
index 67fd3a306369..39142df828a0 100644
--- a/arch/powerpc/sysdev/xive/common.c
+++ b/arch/powerpc/sysdev/xive/common.c
@@ -1848,6 +1848,7 @@ static void xive_core_debugfs_create(void)
 				    &xive_eq_debug_fops);
 	}
 	debugfs_create_bool("store-eoi", 0600, xive_dir, &xive_store_eoi);
+	debugfs_create_bool("save-restore", 0600, xive_dir, &xive_has_save_restore);
 }
 
 #endif /* CONFIG_DEBUG_FS */
diff --git a/arch/powerpc/sysdev/xive/native.c b/arch/powerpc/sysdev/xive/native.c
index 7ec8911dad57..d6a091dc1bce 100644
--- a/arch/powerpc/sysdev/xive/native.c
+++ b/arch/powerpc/sysdev/xive/native.c
@@ -41,7 +41,7 @@ static u32 xive_queue_shift;
 static u32 xive_pool_vps = XIVE_INVALID_VP;
 static struct kmem_cache *xive_provision_cache;
 static bool xive_has_single_esc;
-static bool xive_has_save_restore;
+bool xive_has_save_restore;
 
 int xive_native_populate_irq_data(u32 hw_irq, struct xive_irq_data *data)
 {
-- 
2.31.1


  parent reply	other threads:[~2021-11-05 10:28 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-05 10:26 [PATCH 00/11] powerpc/xive: Improve diagnostic and activate StoreEOI on P10 PowerNV Cédric Le Goater
2021-11-05 10:26 ` [PATCH 01/11] powerpc/xive: Replace pr_devel() by pr_debug() to ease debug Cédric Le Goater
2021-11-05 10:26 ` [PATCH 02/11] powerpc/xive: Introduce an helper to print out interrupt characteristics Cédric Le Goater
2021-11-05 10:26 ` [PATCH 03/11] powerpc/xive: Activate StoreEOI on P10 Cédric Le Goater
2021-11-05 10:26 ` [PATCH 04/11] powerpc/xive: Introduce xive_core_debugfs_create() Cédric Le Goater
2021-11-18  9:21   ` Michael Ellerman
2021-11-18 15:22     ` Cédric Le Goater
2021-11-05 10:26 ` [PATCH 05/11] powerpc/xive: Change the debugfs file 'xive' into a directory Cédric Le Goater
2021-11-05 10:26 ` [PATCH 06/11] powerpc/xive: Rename the 'cpus' debugfs file to 'ipis' Cédric Le Goater
2021-11-05 10:26 ` [PATCH 07/11] powerpc/xive: Add a debugfs file to dump EQs Cédric Le Goater
2021-11-05 10:26 ` [PATCH 08/11] powerpc/xive: Add a debugfs toggle for StoreEOI Cédric Le Goater
2021-11-05 10:26 ` [PATCH 09/11] powerpc/xive: Add a kernel parameter " Cédric Le Goater
2021-11-05 10:26 ` Cédric Le Goater [this message]
2021-11-05 10:26 ` [PATCH 11/11] powerpc/smp: Add a doorbell=off kernel parameter Cédric Le Goater
2021-11-11 10:41   ` Michael Ellerman
2021-11-11 16:01     ` Cédric Le Goater
2021-11-18  9:24       ` Michael Ellerman
2021-11-18 15:26         ` Cédric Le Goater
2021-11-25  9:36 ` [PATCH 00/11] powerpc/xive: Improve diagnostic and activate StoreEOI on P10 PowerNV Michael Ellerman

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