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Message-ID: <1436014910-1201-2-git-send-email-jszhang@marvell.com>
Date: Sat, 4 Jul 2015 21:01:48 +0800
From: Jisheng Zhang <jszhang@...vell.com>
To: <linux@....linux.org.uk>, <will.deacon@....com>,
<mark.rutland@....com>, <daniel.lezcano@...aro.org>,
<Catalin.Marinas@....com>, <Lorenzo.Pieralisi@....com>
CC: <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, Jisheng Zhang <jszhang@...vell.com>
Subject: [RFC PATCH 1/3] arm: psci: rename psci_smp.c to psci.c
This will prepare for next commit to enable PSCI for UP systems so that
calls like cpu_suspend can be made functional on UP too.
Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
---
arch/arm/kernel/Makefile | 2 +-
arch/arm/kernel/psci.c | 130 +++++++++++++++++++++++++++++++++++++++++++++
arch/arm/kernel/psci_smp.c | 130 ---------------------------------------------
3 files changed, 131 insertions(+), 131 deletions(-)
create mode 100644 arch/arm/kernel/psci.c
delete mode 100644 arch/arm/kernel/psci_smp.c
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 3b995f5..c57b2c0 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -90,7 +90,7 @@ obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_ARM_VIRT_EXT) += hyp-stub.o
ifeq ($(CONFIG_ARM_PSCI),y)
obj-y += psci-call.o
-obj-$(CONFIG_SMP) += psci_smp.o
+obj-$(CONFIG_SMP) += psci.o
endif
extra-y := $(head-y) vmlinux.lds
diff --git a/arch/arm/kernel/psci.c b/arch/arm/kernel/psci.c
new file mode 100644
index 0000000..61c04b0
--- /dev/null
+++ b/arch/arm/kernel/psci.c
@@ -0,0 +1,130 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Copyright (C) 2012 ARM Limited
+ *
+ * Author: Will Deacon <will.deacon@....com>
+ */
+
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/of.h>
+#include <linux/delay.h>
+#include <linux/psci.h>
+
+#include <uapi/linux/psci.h>
+
+#include <asm/psci.h>
+#include <asm/smp_plat.h>
+
+/*
+ * psci_smp assumes that the following is true about PSCI:
+ *
+ * cpu_suspend Suspend the execution on a CPU
+ * @state we don't currently describe affinity levels, so just pass 0.
+ * @entry_point the first instruction to be executed on return
+ * returns 0 success, < 0 on failure
+ *
+ * cpu_off Power down a CPU
+ * @state we don't currently describe affinity levels, so just pass 0.
+ * no return on successful call
+ *
+ * cpu_on Power up a CPU
+ * @cpuid cpuid of target CPU, as from MPIDR
+ * @entry_point the first instruction to be executed on return
+ * returns 0 success, < 0 on failure
+ *
+ * migrate Migrate the context to a different CPU
+ * @cpuid cpuid of target CPU, as from MPIDR
+ * returns 0 success, < 0 on failure
+ *
+ */
+
+extern void secondary_startup(void);
+
+static int psci_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+ if (psci_ops.cpu_on)
+ return psci_ops.cpu_on(cpu_logical_map(cpu),
+ virt_to_idmap(&secondary_startup));
+ return -ENODEV;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+int psci_cpu_disable(unsigned int cpu)
+{
+ /* Fail early if we don't have CPU_OFF support */
+ if (!psci_ops.cpu_off)
+ return -EOPNOTSUPP;
+
+ /* Trusted OS will deny CPU_OFF */
+ if (psci_tos_resident_on(cpu))
+ return -EPERM;
+
+ return 0;
+}
+
+void __ref psci_cpu_die(unsigned int cpu)
+{
+ u32 state = PSCI_POWER_STATE_TYPE_POWER_DOWN <<
+ PSCI_0_2_POWER_STATE_TYPE_SHIFT;
+
+ if (psci_ops.cpu_off)
+ psci_ops.cpu_off(state);
+
+ /* We should never return */
+ panic("psci: cpu %d failed to shutdown\n", cpu);
+}
+
+int __ref psci_cpu_kill(unsigned int cpu)
+{
+ int err, i;
+
+ if (!psci_ops.affinity_info)
+ return 1;
+ /*
+ * cpu_kill could race with cpu_die and we can
+ * potentially end up declaring this cpu undead
+ * while it is dying. So, try again a few times.
+ */
+
+ for (i = 0; i < 10; i++) {
+ err = psci_ops.affinity_info(cpu_logical_map(cpu), 0);
+ if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) {
+ pr_info("CPU%d killed.\n", cpu);
+ return 1;
+ }
+
+ msleep(10);
+ pr_info("Retrying again to check for CPU kill\n");
+ }
+
+ pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n",
+ cpu, err);
+ /* Make platform_cpu_kill() fail. */
+ return 0;
+}
+
+#endif
+
+bool __init psci_smp_available(void)
+{
+ /* is cpu_on available at least? */
+ return (psci_ops.cpu_on != NULL);
+}
+
+struct smp_operations __initdata psci_smp_ops = {
+ .smp_boot_secondary = psci_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_disable = psci_cpu_disable,
+ .cpu_die = psci_cpu_die,
+ .cpu_kill = psci_cpu_kill,
+#endif
+};
diff --git a/arch/arm/kernel/psci_smp.c b/arch/arm/kernel/psci_smp.c
deleted file mode 100644
index 61c04b0..0000000
--- a/arch/arm/kernel/psci_smp.c
+++ /dev/null
@@ -1,130 +0,0 @@
-/*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * Copyright (C) 2012 ARM Limited
- *
- * Author: Will Deacon <will.deacon@....com>
- */
-
-#include <linux/init.h>
-#include <linux/smp.h>
-#include <linux/of.h>
-#include <linux/delay.h>
-#include <linux/psci.h>
-
-#include <uapi/linux/psci.h>
-
-#include <asm/psci.h>
-#include <asm/smp_plat.h>
-
-/*
- * psci_smp assumes that the following is true about PSCI:
- *
- * cpu_suspend Suspend the execution on a CPU
- * @state we don't currently describe affinity levels, so just pass 0.
- * @entry_point the first instruction to be executed on return
- * returns 0 success, < 0 on failure
- *
- * cpu_off Power down a CPU
- * @state we don't currently describe affinity levels, so just pass 0.
- * no return on successful call
- *
- * cpu_on Power up a CPU
- * @cpuid cpuid of target CPU, as from MPIDR
- * @entry_point the first instruction to be executed on return
- * returns 0 success, < 0 on failure
- *
- * migrate Migrate the context to a different CPU
- * @cpuid cpuid of target CPU, as from MPIDR
- * returns 0 success, < 0 on failure
- *
- */
-
-extern void secondary_startup(void);
-
-static int psci_boot_secondary(unsigned int cpu, struct task_struct *idle)
-{
- if (psci_ops.cpu_on)
- return psci_ops.cpu_on(cpu_logical_map(cpu),
- virt_to_idmap(&secondary_startup));
- return -ENODEV;
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-int psci_cpu_disable(unsigned int cpu)
-{
- /* Fail early if we don't have CPU_OFF support */
- if (!psci_ops.cpu_off)
- return -EOPNOTSUPP;
-
- /* Trusted OS will deny CPU_OFF */
- if (psci_tos_resident_on(cpu))
- return -EPERM;
-
- return 0;
-}
-
-void __ref psci_cpu_die(unsigned int cpu)
-{
- u32 state = PSCI_POWER_STATE_TYPE_POWER_DOWN <<
- PSCI_0_2_POWER_STATE_TYPE_SHIFT;
-
- if (psci_ops.cpu_off)
- psci_ops.cpu_off(state);
-
- /* We should never return */
- panic("psci: cpu %d failed to shutdown\n", cpu);
-}
-
-int __ref psci_cpu_kill(unsigned int cpu)
-{
- int err, i;
-
- if (!psci_ops.affinity_info)
- return 1;
- /*
- * cpu_kill could race with cpu_die and we can
- * potentially end up declaring this cpu undead
- * while it is dying. So, try again a few times.
- */
-
- for (i = 0; i < 10; i++) {
- err = psci_ops.affinity_info(cpu_logical_map(cpu), 0);
- if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) {
- pr_info("CPU%d killed.\n", cpu);
- return 1;
- }
-
- msleep(10);
- pr_info("Retrying again to check for CPU kill\n");
- }
-
- pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n",
- cpu, err);
- /* Make platform_cpu_kill() fail. */
- return 0;
-}
-
-#endif
-
-bool __init psci_smp_available(void)
-{
- /* is cpu_on available at least? */
- return (psci_ops.cpu_on != NULL);
-}
-
-struct smp_operations __initdata psci_smp_ops = {
- .smp_boot_secondary = psci_boot_secondary,
-#ifdef CONFIG_HOTPLUG_CPU
- .cpu_disable = psci_cpu_disable,
- .cpu_die = psci_cpu_die,
- .cpu_kill = psci_cpu_kill,
-#endif
-};
--
2.1.4
--
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