lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Wed, 28 Oct 2009 15:58:26 -0500
From:	Nathan Fontenot <nfont@...tin.ibm.com>
To:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/6 v5] CPU probe/release files

Create new probe and release sysfs files to facilitate adding and removing
cpus 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 at austin.ibm.com>
---

Index: powerpc/drivers/base/cpu.c
===================================================================
--- powerpc.orig/drivers/base/cpu.c	2009-10-28 15:20:34.000000000 -0500
+++ powerpc/drivers/base/cpu.c	2009-10-28 15:21:53.000000000 -0500
@@ -54,6 +54,7 @@
 		ret = count;
 	return ret;
 }
+
 static SYSDEV_ATTR(online, 0644, show_online, store_online);
 
 static void __cpuinit register_cpu_control(struct cpu *cpu)
@@ -72,6 +73,38 @@
 	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)
 {
Index: powerpc/arch/powerpc/include/asm/machdep.h
===================================================================
--- powerpc.orig/arch/powerpc/include/asm/machdep.h	2009-10-28 15:21:47.000000000 -0500
+++ powerpc/arch/powerpc/include/asm/machdep.h	2009-10-28 15:21:53.000000000 -0500
@@ -274,6 +274,11 @@
 	int (*memory_probe)(u64);
 #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);
Index: powerpc/arch/powerpc/kernel/sysfs.c
===================================================================
--- powerpc.orig/arch/powerpc/kernel/sysfs.c	2009-10-28 15:20:34.000000000 -0500
+++ powerpc/arch/powerpc/kernel/sysfs.c	2009-10-28 15:21:53.000000000 -0500
@@ -461,6 +461,25 @@
 
 	cacheinfo_cpu_offline(cpu);
 }
+
+#ifdef CONFIG_ARCH_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_PROBE_RELEASE */
+
 #endif /* CONFIG_HOTPLUG_CPU */
 
 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
Index: powerpc/arch/powerpc/Kconfig
===================================================================
--- powerpc.orig/arch/powerpc/Kconfig	2009-10-28 15:21:47.000000000 -0500
+++ powerpc/arch/powerpc/Kconfig	2009-10-28 15:21:53.000000000 -0500
@@ -320,6 +320,10 @@
 
 	  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
 
Index: powerpc/include/linux/cpu.h
===================================================================
--- powerpc.orig/include/linux/cpu.h	2009-10-28 15:20:34.000000000 -0500
+++ powerpc/include/linux/cpu.h	2009-10-28 15:21:53.000000000 -0500
@@ -43,6 +43,10 @@
 
 #ifdef CONFIG_HOTPLUG_CPU
 extern void unregister_cpu(struct cpu *cpu);
+#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
+extern ssize_t arch_cpu_probe(const char *, size_t);
+extern ssize_t arch_cpu_release(const char *, size_t);
+#endif
 #endif
 
 struct notifier_block;
Index: powerpc/arch/powerpc/kernel/smp.c
===================================================================
--- powerpc.orig/arch/powerpc/kernel/smp.c	2009-10-28 15:20:34.000000000 -0500
+++ powerpc/arch/powerpc/kernel/smp.c	2009-10-28 15:21:53.000000000 -0500
@@ -364,7 +364,24 @@
 	set_cpu_online(cpu, true);
 	local_irq_enable();
 }
+
+#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
+#endif /* CONFIG_HOTPLUG_CPU */
 
 static int __devinit cpu_enable(unsigned int cpu)
 {
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists