Commit a9fd74cb authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6:
  Documentation: ABI: /sys/devices/system/cpu/cpu#/node
  Documentation: ABI: /sys/devices/system/cpu/cpuidle/
  Documentation: ABI: /sys/devices/system/cpu/sched_[mc|smt]_power_savings
  Documentation: ABI: /sys/devices/system/cpu/cpu#/ topology files
  Documentation: ABI: /sys/devices/system/cpu/ topology files
  Documentation: ABI: document /sys/devices/system/cpu/
  Documentation: ABI: rename sysfs-devices-cache_disable properly
  Driver core: allow certain drivers prohibit bind/unbind via sysfs
  Driver core: fix driver_register() return value
parents 7d531a7e 657348a0

Documentation/ABI/testing/sysfs-devices-cache_disable

deleted100644 → 0
+0 −18
Original line number Diff line number Diff line 
What:      /sys/devices/system/cpu/cpu*/cache/index*/cache_disable_X

Date:      August 2008

KernelVersion:	2.6.27

Contact:	mark.langsdorf@amd.com

Description:	These files exist in every cpu's cache index directories.

		There are currently 2 cache_disable_# files in each

		directory.  Reading from these files on a supported

		processor will return that cache disable index value

		for that processor and node.  Writing to one of these

		files will cause the specificed cache index to be disabled.



		Currently, only AMD Family 10h Processors support cache index

		disable, and only for their L3 caches.  See the BIOS and

		Kernel Developer's Guide at

		http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/31116-Public-GH-BKDG_3.20_2-4-09.pdf

		for formatting information and other details on the

		cache index disable.

Users:    joachim.deguara@amd.com

Documentation/ABI/testing/sysfs-devices-system-cpu

0 → 100644
+156 −0
Original line number Diff line number Diff line 
What:		/sys/devices/system/cpu/

Date:		pre-git history

Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>

Description:

		A collection of both global and individual CPU attributes



		Individual CPU attributes are contained in subdirectories

		named by the kernel's logical CPU number, e.g.:



		/sys/devices/system/cpu/cpu#/



What:		/sys/devices/system/cpu/sched_mc_power_savings

		/sys/devices/system/cpu/sched_smt_power_savings

Date:		June 2006

Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>

Description:	Discover and adjust the kernel's multi-core scheduler support.



		Possible values are:



		0 - No power saving load balance (default value)

		1 - Fill one thread/core/package first for long running threads

		2 - Also bias task wakeups to semi-idle cpu package for power

		    savings



		sched_mc_power_savings is dependent upon SCHED_MC, which is

		itself architecture dependent.



		sched_smt_power_savings is dependent upon SCHED_SMT, which

		is itself architecture dependent.



		The two files are independent of each other. It is possible

		that one file may be present without the other.



		Introduced by git commit 5c45bf27.





What:		/sys/devices/system/cpu/kernel_max

		/sys/devices/system/cpu/offline

		/sys/devices/system/cpu/online

		/sys/devices/system/cpu/possible

		/sys/devices/system/cpu/present

Date:		December 2008

Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>

Description:	CPU topology files that describe kernel limits related to

		hotplug. Briefly:



		kernel_max: the maximum cpu index allowed by the kernel

		configuration.



		offline: cpus that are not online because they have been

		HOTPLUGGED off or exceed the limit of cpus allowed by the

		kernel configuration (kernel_max above).



		online: cpus that are online and being scheduled.



		possible: cpus that have been allocated resources and can be

		brought online if they are present.



		present: cpus that have been identified as being present in

		the system.



		See Documentation/cputopology.txt for more information.







What:		/sys/devices/system/cpu/cpu#/node

Date:		October 2009

Contact:	Linux memory management mailing list <linux-mm@kvack.org>

Description:	Discover NUMA node a CPU belongs to



		When CONFIG_NUMA is enabled, a symbolic link that points

		to the corresponding NUMA node directory.



		For example, the following symlink is created for cpu42

		in NUMA node 2:



		/sys/devices/system/cpu/cpu42/node2 -> ../../node/node2





What:		/sys/devices/system/cpu/cpu#/topology/core_id

		/sys/devices/system/cpu/cpu#/topology/core_siblings

		/sys/devices/system/cpu/cpu#/topology/core_siblings_list

		/sys/devices/system/cpu/cpu#/topology/physical_package_id

		/sys/devices/system/cpu/cpu#/topology/thread_siblings

		/sys/devices/system/cpu/cpu#/topology/thread_siblings_list

Date:		December 2008

Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>

Description:	CPU topology files that describe a logical CPU's relationship

		to other cores and threads in the same physical package.



		One cpu# directory is created per logical CPU in the system,

		e.g. /sys/devices/system/cpu/cpu42/.



		Briefly, the files above are:



		core_id: the CPU core ID of cpu#. Typically it is the

		hardware platform's identifier (rather than the kernel's).

		The actual value is architecture and platform dependent.



		core_siblings: internal kernel map of cpu#'s hardware threads

		within the same physical_package_id.



		core_siblings_list: human-readable list of the logical CPU

		numbers within the same physical_package_id as cpu#.



		physical_package_id: physical package id of cpu#. Typically

		corresponds to a physical socket number, but the actual value

		is architecture and platform dependent.



		thread_siblings: internel kernel map of cpu#'s hardware

		threads within the same core as cpu#



		thread_siblings_list: human-readable list of cpu#'s hardware

		threads within the same core as cpu#



		See Documentation/cputopology.txt for more information.





What:		/sys/devices/system/cpu/cpuidle/current_driver

		/sys/devices/system/cpu/cpuidle/current_governer_ro

Date:		September 2007

Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>

Description:	Discover cpuidle policy and mechanism



		Various CPUs today support multiple idle levels that are

		differentiated by varying exit latencies and power

		consumption during idle.



		Idle policy (governor) is differentiated from idle mechanism

		(driver)



		current_driver: displays current idle mechanism



		current_governor_ro: displays current idle policy



		See files in Documentation/cpuidle/ for more information.





What:      /sys/devices/system/cpu/cpu*/cache/index*/cache_disable_X

Date:      August 2008

KernelVersion:	2.6.27

Contact:	mark.langsdorf@amd.com

Description:	These files exist in every cpu's cache index directories.

		There are currently 2 cache_disable_# files in each

		directory.  Reading from these files on a supported

		processor will return that cache disable index value

		for that processor and node.  Writing to one of these

		files will cause the specificed cache index to be disabled.



		Currently, only AMD Family 10h Processors support cache index

		disable, and only for their L3 caches.  See the BIOS and

		Kernel Developer's Guide at

		http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/31116-Public-GH-BKDG_3.20_2-4-09.pdf

		for formatting information and other details on the

		cache index disable.

Users:    joachim.deguara@amd.com

Documentation/cputopology.txt

+30 −17
Original line number Diff line number Diff line 


Export cpu topology info via sysfs. Items (attributes) are similar

Export CPU topology info via sysfs. Items (attributes) are similar

to /proc/cpuinfo.



1) /sys/devices/system/cpu/cpuX/topology/physical_package_id:

represent the physical package id of  cpu X;



	physical package id of cpuX. Typically corresponds to a physical

	socket number, but the actual value is architecture and platform

	dependent.



2) /sys/devices/system/cpu/cpuX/topology/core_id:

represent the cpu core id to cpu X;



	the CPU core ID of cpuX. Typically it is the hardware platform's

	identifier (rather than the kernel's).  The actual value is

	architecture and platform dependent.



3) /sys/devices/system/cpu/cpuX/topology/thread_siblings:

represent the thread siblings to cpu X in the same core;



	internel kernel map of cpuX's hardware threads within the same

	core as cpuX



4) /sys/devices/system/cpu/cpuX/topology/core_siblings:

represent the thread siblings to cpu X in the same physical package;



	internal kernel map of cpuX's hardware threads within the same

	physical_package_id.



To implement it in an architecture-neutral way, a new source file,

drivers/base/topology.c, is to export the 4 attributes.
@@ -32,32 +45,32 @@ not defined by include/asm-XXX/topology.h: 
3) thread_siblings: just the given CPU

4) core_siblings: just the given CPU



Additionally, cpu topology information is provided under

Additionally, CPU topology information is provided under

/sys/devices/system/cpu and includes these files.  The internal

source for the output is in brackets ("[]").



    kernel_max: the maximum cpu index allowed by the kernel configuration.

    kernel_max: the maximum CPU index allowed by the kernel configuration.

		[NR_CPUS-1]



    offline:	cpus that are not online because they have been

    offline:	CPUs that are not online because they have been

		HOTPLUGGED off (see cpu-hotplug.txt) or exceed the limit

		of cpus allowed by the kernel configuration (kernel_max

		of CPUs allowed by the kernel configuration (kernel_max

		above). [~cpu_online_mask + cpus >= NR_CPUS]



    online:	cpus that are online and being scheduled [cpu_online_mask]

    online:	CPUs that are online and being scheduled [cpu_online_mask]



    possible:	cpus that have been allocated resources and can be

    possible:	CPUs that have been allocated resources and can be

		brought online if they are present. [cpu_possible_mask]



    present:	cpus that have been identified as being present in the

    present:	CPUs that have been identified as being present in the

		system. [cpu_present_mask]



The format for the above output is compatible with cpulist_parse()

[see <linux/cpumask.h>].  Some examples follow.



In this example, there are 64 cpus in the system but cpus 32-63 exceed

In this example, there are 64 CPUs in the system but cpus 32-63 exceed

the kernel max which is limited to 0..31 by the NR_CPUS config option

being 32.  Note also that cpus 2 and 4-31 are not online but could be

being 32.  Note also that CPUs 2 and 4-31 are not online but could be

brought online as they are both present and possible.



     kernel_max: 31
@@ -67,8 +80,8 @@ brought online as they are both present and possible. 
        present: 0-31



In this example, the NR_CPUS config option is 128, but the kernel was

started with possible_cpus=144.  There are 4 cpus in the system and cpu2

was manually taken offline (and is the only cpu that can be brought

started with possible_cpus=144.  There are 4 CPUs in the system and cpu2

was manually taken offline (and is the only CPU that can be brought

online.)



     kernel_max: 127
@@ -78,4 +91,4 @@ online.) 
        present: 0-3



See cpu-hotplug.txt for the possible_cpus=NUM kernel start parameter

as well as more information on the various cpumask's.
 
as well as more information on the various cpumasks.

drivers/base/bus.c

+11 −6
Original line number Diff line number Diff line
@@ -689,15 +689,19 @@ int bus_add_driver(struct device_driver *drv) 
		printk(KERN_ERR "%s: driver_add_attrs(%s) failed\n",

			__func__, drv->name);

	}



	if (!drv->suppress_bind_attrs) {

		error = add_bind_files(drv);

		if (error) {

			/* Ditto */

			printk(KERN_ERR "%s: add_bind_files(%s) failed\n",

				__func__, drv->name);

		}

	}



	kobject_uevent(&priv->kobj, KOBJ_ADD);

	return 0;



out_unregister:

	kfree(drv->p);

	drv->p = NULL;
@@ -720,6 +724,7 @@ void bus_remove_driver(struct device_driver *drv) 
	if (!drv->bus)

		return;



	if (!drv->suppress_bind_attrs)

		remove_bind_files(drv);

	driver_remove_attrs(drv->bus, drv);

	driver_remove_file(drv, &driver_attr_uevent);

drivers/base/driver.c

+1 −1
Original line number Diff line number Diff line
@@ -236,7 +236,7 @@ int driver_register(struct device_driver *drv) 
		put_driver(other);

		printk(KERN_ERR "Error: Driver '%s' is already registered, "

			"aborting...\n", drv->name);

		return -EEXIST;

		return -EBUSY;

	}



	ret = bus_add_driver(drv);

CRA Git | Maintained and supported by SUSTech CRA and CCSE