From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Dave Martin <dave.martin@arm.com>,
Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Marc Zyngier <marc.zyngier@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>,
Russell King <linux@arm.linux.org.uk>,
Colin Cross <ccross@android.com>, Yu Tang <ytang5@marvell.com>,
Zhou Zhu <zzhu3@marvell.com>, Kumar Sankaran <ksankaran@apm.com>,
Loc Ho <lho@apm.com>, Feng Kan <fkan@apm.com>,
Nicolas Pitre <nico@linaro.org>,
Santosh Shilimkar <santosh.shilimkar@ti.com>,
Stephen Boyd <sboyd@codeaurora.org>,
Graeme Gregory <graeme.gregory@linaro.org>,
Hanjun Guo <hanjun.guo@linaro.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Christoffer Dall <christoffer.dall@linaro.org>
Subject: [PATCH RFC v3 05/12] arm64: kernel: implement fpsimd CPU PM notifier
Date: Thu, 21 Nov 2013 11:24:12 +0000 [thread overview]
Message-ID: <1385033059-25896-6-git-send-email-lorenzo.pieralisi@arm.com> (raw)
In-Reply-To: <1385033059-25896-1-git-send-email-lorenzo.pieralisi@arm.com>
When a CPU enters a low power state, its FP register content is lost.
This patch adds a notifier to save the FP context on CPU shutdown
and restore it on CPU resume. The context is saved and restored only
if the suspending thread is not a kernel thread, mirroring the current
context switch behaviour.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
---
arch/arm64/kernel/fpsimd.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index bb785d2..4aef42a 100644
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -17,6 +17,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#include <linux/cpu_pm.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
@@ -113,6 +114,39 @@ EXPORT_SYMBOL(kernel_neon_end);
#endif /* CONFIG_KERNEL_MODE_NEON */
+#ifdef CONFIG_CPU_PM
+static int fpsimd_cpu_pm_notifier(struct notifier_block *self,
+ unsigned long cmd, void *v)
+{
+ switch (cmd) {
+ case CPU_PM_ENTER:
+ if (current->mm)
+ fpsimd_save_state(¤t->thread.fpsimd_state);
+ break;
+ case CPU_PM_EXIT:
+ if (current->mm)
+ fpsimd_load_state(¤t->thread.fpsimd_state);
+ break;
+ case CPU_PM_ENTER_FAILED:
+ default:
+ return NOTIFY_DONE;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block fpsimd_cpu_pm_notifier_block = {
+ .notifier_call = fpsimd_cpu_pm_notifier,
+};
+
+static void fpsimd_pm_init(void)
+{
+ cpu_pm_register_notifier(&fpsimd_cpu_pm_notifier_block);
+}
+
+#else
+static inline void fpsimd_pm_init(void) { }
+#endif /* CONFIG_CPU_PM */
+
/*
* FP/SIMD support code initialisation.
*/
@@ -131,6 +165,8 @@ static int __init fpsimd_init(void)
else
elf_hwcap |= HWCAP_ASIMD;
+ fpsimd_pm_init();
+
return 0;
}
late_initcall(fpsimd_init);
--
1.8.4
WARNING: multiple messages have this Message-ID (diff)
From: lorenzo.pieralisi@arm.com (Lorenzo Pieralisi)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH RFC v3 05/12] arm64: kernel: implement fpsimd CPU PM notifier
Date: Thu, 21 Nov 2013 11:24:12 +0000 [thread overview]
Message-ID: <1385033059-25896-6-git-send-email-lorenzo.pieralisi@arm.com> (raw)
In-Reply-To: <1385033059-25896-1-git-send-email-lorenzo.pieralisi@arm.com>
When a CPU enters a low power state, its FP register content is lost.
This patch adds a notifier to save the FP context on CPU shutdown
and restore it on CPU resume. The context is saved and restored only
if the suspending thread is not a kernel thread, mirroring the current
context switch behaviour.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
---
arch/arm64/kernel/fpsimd.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index bb785d2..4aef42a 100644
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -17,6 +17,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#include <linux/cpu_pm.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
@@ -113,6 +114,39 @@ EXPORT_SYMBOL(kernel_neon_end);
#endif /* CONFIG_KERNEL_MODE_NEON */
+#ifdef CONFIG_CPU_PM
+static int fpsimd_cpu_pm_notifier(struct notifier_block *self,
+ unsigned long cmd, void *v)
+{
+ switch (cmd) {
+ case CPU_PM_ENTER:
+ if (current->mm)
+ fpsimd_save_state(¤t->thread.fpsimd_state);
+ break;
+ case CPU_PM_EXIT:
+ if (current->mm)
+ fpsimd_load_state(¤t->thread.fpsimd_state);
+ break;
+ case CPU_PM_ENTER_FAILED:
+ default:
+ return NOTIFY_DONE;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block fpsimd_cpu_pm_notifier_block = {
+ .notifier_call = fpsimd_cpu_pm_notifier,
+};
+
+static void fpsimd_pm_init(void)
+{
+ cpu_pm_register_notifier(&fpsimd_cpu_pm_notifier_block);
+}
+
+#else
+static inline void fpsimd_pm_init(void) { }
+#endif /* CONFIG_CPU_PM */
+
/*
* FP/SIMD support code initialisation.
*/
@@ -131,6 +165,8 @@ static int __init fpsimd_init(void)
else
elf_hwcap |= HWCAP_ASIMD;
+ fpsimd_pm_init();
+
return 0;
}
late_initcall(fpsimd_init);
--
1.8.4
next prev parent reply other threads:[~2013-11-21 11:24 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-21 11:24 [PATCH RFC v3 00/12] arm64: suspend/resume implementation Lorenzo Pieralisi
2013-11-21 11:24 ` Lorenzo Pieralisi
2013-11-21 11:24 ` [PATCH RFC v3 01/12] arm64: kernel: add MPIDR_EL1 accessors macros Lorenzo Pieralisi
2013-11-21 11:24 ` Lorenzo Pieralisi
2013-11-21 11:24 ` [PATCH RFC v3 02/12] arm64: kernel: build MPIDR_EL1 hash function data structure Lorenzo Pieralisi
2013-11-21 11:24 ` Lorenzo Pieralisi
2013-11-21 11:24 ` [PATCH RFC v3 03/12] arm64: kernel: suspend/resume registers save/restore Lorenzo Pieralisi
2013-11-21 11:24 ` Lorenzo Pieralisi
2013-11-21 11:24 ` [PATCH RFC v3 04/12] arm64: kernel: cpu_{suspend/resume} implementation Lorenzo Pieralisi
2013-11-21 11:24 ` Lorenzo Pieralisi
2013-12-20 11:30 ` Leo Yan
2013-12-20 11:30 ` Leo Yan
2013-12-20 11:57 ` Catalin Marinas
2013-12-20 11:57 ` Catalin Marinas
2013-12-23 14:04 ` Lorenzo Pieralisi
2013-12-23 14:04 ` Lorenzo Pieralisi
2013-12-24 6:18 ` Leo Yan
2013-12-24 6:18 ` Leo Yan
2013-11-21 11:24 ` Lorenzo Pieralisi [this message]
2013-11-21 11:24 ` [PATCH RFC v3 05/12] arm64: kernel: implement fpsimd CPU PM notifier Lorenzo Pieralisi
2013-11-21 11:24 ` [PATCH RFC v3 06/12] arm: kvm: implement " Lorenzo Pieralisi
2013-11-21 11:24 ` Lorenzo Pieralisi
2013-11-27 3:02 ` Christoffer Dall
2013-11-27 3:02 ` Christoffer Dall
2013-11-21 11:24 ` [PATCH RFC v3 07/12] arm64: kernel: refactor code to install/uninstall breakpoints Lorenzo Pieralisi
2013-11-21 11:24 ` Lorenzo Pieralisi
2013-11-21 11:24 ` [PATCH RFC v3 08/12] arm64: kernel: implement HW breakpoints CPU PM notifier Lorenzo Pieralisi
2013-11-21 11:24 ` Lorenzo Pieralisi
2013-12-20 17:29 ` Will Deacon
2013-12-20 17:29 ` Will Deacon
2013-12-23 13:50 ` Lorenzo Pieralisi
2013-12-23 13:50 ` Lorenzo Pieralisi
2013-11-21 11:24 ` [PATCH RFC v3 09/12] arm64: enable generic clockevent broadcast Lorenzo Pieralisi
2013-11-21 11:24 ` Lorenzo Pieralisi
2013-11-21 11:24 ` [PATCH RFC v3 10/12] arm64: kernel: add CPU idle call Lorenzo Pieralisi
2013-11-21 11:24 ` Lorenzo Pieralisi
2013-11-21 11:24 ` [PATCH RFC v3 11/12] arm64: kernel: add PM build infrastructure Lorenzo Pieralisi
2013-11-21 11:24 ` Lorenzo Pieralisi
2013-11-21 11:24 ` [PATCH RFC v3 12/12] arm64: add CPU power management menu/entries Lorenzo Pieralisi
2013-11-21 11:24 ` Lorenzo Pieralisi
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