summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorNathan Fontenot <nfont@austin.ibm.com>2009-11-25 17:23:25 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-12-09 17:09:33 +1100
commit12633e803a2a556f6469e0933d08233d0844a2d9 (patch)
treed32e3e32c163a57c9681009f5ea965088d9e4579
parentab519a011caa5ec47d992cb8a4fc8e7af9b9e3f8 (diff)
downloadop-kernel-dev-12633e803a2a556f6469e0933d08233d0844a2d9.zip
op-kernel-dev-12633e803a2a556f6469e0933d08233d0844a2d9.tar.gz
sysfs/cpu: Add probe/release files
Version 3 of this patch is updated with documentation added to Documentation/ABI. There are no changes to any of the C code from v2 of the patch. In order to support kernel DLPAR of CPU resources we need to provide an interface to add (probe) and remove (release) the resource from the system. This patch Creates new generic probe and release sysfs files to facilitate cpu probe/release. The probe/release interface provides for allowing each arch to supply their own routines for implementing the backend of adding and removing cpus to/from the system. This also creates the powerpc specific stubs to handle the arch callouts from writes to the sysfs files. The creation and use of these files is regulated by the CONFIG_ARCH_CPU_PROBE_RELEASE option so that only architectures that need the capability will have the files created. Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--Documentation/ABI/testing/sysfs-devices-system-cpu15
-rw-r--r--arch/powerpc/Kconfig4
-rw-r--r--arch/powerpc/include/asm/machdep.h5
-rw-r--r--arch/powerpc/kernel/sysfs.c19
-rw-r--r--drivers/base/cpu.c32
-rw-r--r--include/linux/cpu.h2
6 files changed, 77 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index a703b9e..d868a11 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -62,6 +62,21 @@ Description: CPU topology files that describe kernel limits related to
See Documentation/cputopology.txt for more information.
+What: /sys/devices/system/cpu/probe
+ /sys/devices/system/cpu/release
+Date: November 2009
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description: Dynamic addition and removal of CPU's. This is not hotplug
+ removal, this is meant complete removal/addition of the CPU
+ from the system.
+
+ probe: writes to this file will dynamically add a CPU to the
+ system. Information written to the file to add CPU's is
+ architecture specific.
+
+ release: writes to this file dynamically remove a CPU from
+ the system. Information writtento the file to remove CPU's
+ is architecture specific.
What: /sys/devices/system/cpu/cpu#/node
Date: October 2009
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 5dbd375..0df5746 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -320,6 +320,10 @@ config HOTPLUG_CPU
Say N if you are unsure.
+config ARCH_CPU_PROBE_RELEASE
+ def_bool y
+ depends on HOTPLUG_CPU
+
config ARCH_ENABLE_MEMORY_HOTPLUG
def_bool y
diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index 9efa2be..9f0fc9e 100644
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -266,6 +266,11 @@ struct machdep_calls {
void (*suspend_disable_irqs)(void);
void (*suspend_enable_irqs)(void);
#endif
+
+#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
+ ssize_t (*cpu_probe)(const char *, size_t);
+ ssize_t (*cpu_release)(const char *, size_t);
+#endif
};
extern void e500_idle(void);
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index 956ab33..e235e52 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -461,6 +461,25 @@ static void unregister_cpu_online(unsigned int cpu)
cacheinfo_cpu_offline(cpu);
}
+
+#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
+ssize_t arch_cpu_probe(const char *buf, size_t count)
+{
+ if (ppc_md.cpu_probe)
+ return ppc_md.cpu_probe(buf, count);
+
+ return -EINVAL;
+}
+
+ssize_t arch_cpu_release(const char *buf, size_t count)
+{
+ if (ppc_md.cpu_release)
+ return ppc_md.cpu_release(buf, count);
+
+ return -EINVAL;
+}
+#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
+
#endif /* CONFIG_HOTPLUG_CPU */
static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index e62a4cc..7c03af7 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -72,6 +72,38 @@ void unregister_cpu(struct cpu *cpu)
per_cpu(cpu_sys_devices, logical_cpu) = NULL;
return;
}
+
+#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
+static ssize_t cpu_probe_store(struct class *class, const char *buf,
+ size_t count)
+{
+ return arch_cpu_probe(buf, count);
+}
+
+static ssize_t cpu_release_store(struct class *class, const char *buf,
+ size_t count)
+{
+ return arch_cpu_release(buf, count);
+}
+
+static CLASS_ATTR(probe, S_IWUSR, NULL, cpu_probe_store);
+static CLASS_ATTR(release, S_IWUSR, NULL, cpu_release_store);
+
+int __init cpu_probe_release_init(void)
+{
+ int rc;
+
+ rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
+ &class_attr_probe.attr);
+ if (!rc)
+ rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
+ &class_attr_release.attr);
+
+ return rc;
+}
+device_initcall(cpu_probe_release_init);
+#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
+
#else /* ... !CONFIG_HOTPLUG_CPU */
static inline void register_cpu_control(struct cpu *cpu)
{
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 4753619..c972f7c 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -43,6 +43,8 @@ extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
#ifdef CONFIG_HOTPLUG_CPU
extern void unregister_cpu(struct cpu *cpu);
+extern ssize_t arch_cpu_probe(const char *, size_t);
+extern ssize_t arch_cpu_release(const char *, size_t);
#endif
struct notifier_block;
OpenPOWER on IntegriCloud