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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Nathan Lynch <nathanl@linux.ibm.com>,
	"Gautham R . Shenoy" <ego@linux.vnet.ibm.com>,
	linuxppc-dev@lists.ozlabs.org, Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.9 152/251] powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild
Date: Thu, 16 Jan 2020 12:35:01 -0500
Message-ID: <20200116173641.22137-112-sashal@kernel.org> (raw)
In-Reply-To: <20200116173641.22137-1-sashal@kernel.org>

From: Nathan Lynch <nathanl@linux.ibm.com>

[ Upstream commit d4aa219a074a5abaf95a756b9f0d190b5c03a945 ]

Allow external callers to force the cacheinfo code to release all its
references to cache nodes, e.g. before processing device tree updates
post-migration, and to rebuild the hierarchy afterward.

CPU online/offline must be blocked by callers; enforce this.

Fixes: 410bccf97881 ("powerpc/pseries: Partition migration in the kernel")
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/powerpc/kernel/cacheinfo.c | 21 +++++++++++++++++++++
 arch/powerpc/kernel/cacheinfo.h |  4 ++++
 2 files changed, 25 insertions(+)

diff --git a/arch/powerpc/kernel/cacheinfo.c b/arch/powerpc/kernel/cacheinfo.c
index c641983bbdd6..0122d5ce0637 100644
--- a/arch/powerpc/kernel/cacheinfo.c
+++ b/arch/powerpc/kernel/cacheinfo.c
@@ -867,4 +867,25 @@ void cacheinfo_cpu_offline(unsigned int cpu_id)
 	if (cache)
 		cache_cpu_clear(cache, cpu_id);
 }
+
+void cacheinfo_teardown(void)
+{
+	unsigned int cpu;
+
+	lockdep_assert_cpus_held();
+
+	for_each_online_cpu(cpu)
+		cacheinfo_cpu_offline(cpu);
+}
+
+void cacheinfo_rebuild(void)
+{
+	unsigned int cpu;
+
+	lockdep_assert_cpus_held();
+
+	for_each_online_cpu(cpu)
+		cacheinfo_cpu_online(cpu);
+}
+
 #endif /* (CONFIG_PPC_PSERIES && CONFIG_SUSPEND) || CONFIG_HOTPLUG_CPU */
diff --git a/arch/powerpc/kernel/cacheinfo.h b/arch/powerpc/kernel/cacheinfo.h
index a7b74d36acd7..2cdee87a482c 100644
--- a/arch/powerpc/kernel/cacheinfo.h
+++ b/arch/powerpc/kernel/cacheinfo.h
@@ -5,4 +5,8 @@
 extern void cacheinfo_cpu_online(unsigned int cpu_id);
 extern void cacheinfo_cpu_offline(unsigned int cpu_id);
 
+/* Allow migration/suspend to tear down and rebuild the hierarchy. */
+extern void cacheinfo_teardown(void);
+extern void cacheinfo_rebuild(void);
+
 #endif /* _PPC_CACHEINFO_H */
-- 
2.20.1


  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200116173641.22137-1-sashal@kernel.org>
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 043/251] ASoC: imx-sgtl5000: put of nodes if finding codec fails Sasha Levin
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 110/251] soc/fsl/qe: Fix an error code in qe_pin_request() Sasha Levin
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 117/251] powerpc: vdso: Make vdso32 installation conditional in vdso_install Sasha Levin
2020-01-16 17:35 ` Sasha Levin [this message]
2020-01-16 17:35 ` [PATCH AUTOSEL 4.9 159/251] perf/ioctl: Add check for the sample_period value Sasha Levin
2020-01-16 17:35 ` [PATCH AUTOSEL 4.9 174/251] ALSA: aoa: onyx: always initialize register read value Sasha Levin
2020-01-16 17:36 ` [PATCH AUTOSEL 4.9 246/251] powerpc/powernv: Disable native PCIe port management Sasha Levin
2020-01-16 17:36 ` [PATCH AUTOSEL 4.9 250/251] powerpc/archrandom: fix arch_get_random_seed_int() Sasha Levin

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