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Subject[PATCH 11/11] KBUS configuration and Makefile
Date

Signed-off-by: Tony Ibbs <tibs@tonyibbs.co.uk>
---
init/Kconfig | 2 +
ipc/Kconfig | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
ipc/Makefile | 9 ++++
3 files changed, 128 insertions(+), 0 deletions(-)
create mode 100644 ipc/Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index c972899..945c380 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -339,6 +339,8 @@ config AUDIT_TREE
depends on AUDITSYSCALL
select FSNOTIFY

+source "ipc/Kconfig"
+
source "kernel/irq/Kconfig"

menu "RCU Subsystem"
diff --git a/ipc/Kconfig b/ipc/Kconfig
new file mode 100644
index 0000000..808d742
--- /dev/null
+++ b/ipc/Kconfig
@@ -0,0 +1,117 @@
+config KBUS
+ tristate "KBUS messaging system"
+ default n
+ ---help---
+ KBUS is a lightweight messaging system, particularly aimed
+ at embedded platforms. This option provides the kernel support
+ for mediating messages between client processes.
+
+ KBUS documentation may be found in Documentation/Kbus.txt
+
+ If you want KBUS support, you should say Y or M here. If you
+ choose M, the module will be called kbus.
+
+ If unsure, say N.
+
+if KBUS
+
+config KBUS_DEBUG
+ bool "Make KBUS debugging messages available"
+ default y
+ ---help---
+ This is the master switch for KBUS debug kernel messages.
+
+ If N is selected, all debug messages will be compiled out,
+ and the KBUS_IOC_VERBOSE ioctl will have no effect.
+
+ If Y is selected, then KBUS_DEBUG_DEFAULT_VERBOSE sets
+ the default for whether debug messages are emitted or not,
+ and the KBUS_IOC_VERBOSE ioctl can be used at runtime to
+ set/unset the output of debugging messages per KBUS device.
+
+ If unsure, say Y.
+
+config KBUS_DEBUG_DEFAULT_VERBOSE
+ bool "Output KBUS debug messages by default"
+ depends on KBUS_DEBUG
+ default n
+ ---help---
+ This sets the default state for the output of debugging messages,
+ It only has effect if KBUS_DEBUG is already set.
+
+ If Y is selected, then KBUS devices default to outputting debug
+ messages. If N is selected, they do not.
+
+ In either case, debug messages for a particular KBUS device can
+ be turned on or off at runtime with the KBUS_IOC_VERBOSE ioctl.
+
+ If unsure, say N.
+
+config KBUS_DEF_NUM_DEVICES
+ int "Number of KBUS devices to auto-create"
+ default 1
+ range 1 KBUS_MAX_NUM_DEVICES
+ ---help---
+ This specifies the number of KBUS devices automatically created
+ when the KBUS subsystem initialises (when the module is loaded
+ or the kernel booted, as appropriate).
+
+ If KBUS is built as a module, this number may also be given as a
+ parameter; for example: kbus_num_devices=5.
+
+ Additional devices can be added at runtime using the
+ KBUS_IOC_NEWDEVICE ioctl.
+
+config KBUS_MAX_NUM_DEVICES
+ int "Maximum number of KBUS devices"
+ default 256
+ range 1 2147483647
+ # We don't impose a limit on the max, so if you've got enough
+ # RAM the only practical limit will be the (int) minor count
+ # passed to __register_chrdev_region.
+ ---help---
+ The maximum number of KBUS devices to support. If unsure, use
+ the default of 256.
+
+ Note that this setting controls the size of an array of pointers
+ to in-kernel KBUS structures; reducing it only saves a tiny amount
+ of RAM. On the other hand, once a KBUS device is used, the various
+ message lists and so on do take space.
+
+config KBUS_DEF_MAX_MESSAGES
+ int "Default KBUS message queue size limit"
+ default 100
+ range 1 2147483647
+ ---help---
+ Specify the default incoming message queue size limit. This default
+ is applied to all clients whenever they open or reopen a KBUS device
+ node.
+
+ Clients sending messages may specify the desired behaviour if any
+ of the recipients' message queues are full. If a senders own queue
+ is full, it may not send a message flagged as a Request. Refer to
+ the KBBUS documentation ("Queues filling up") for details.
+
+ Clients may change their own queue size limits at any time with the
+ KBUS_IOC_MAXMSGS ioctl.
+
+ The default is believed to be a reasonable conservative choice.
+
+config KBUS_MAX_UNSENT_UNBIND_MESSAGES
+ int "Maximum number of unsent KBUS unbind event messages"
+ default 1000
+ range 1 2147483647
+ ---help---
+ KBUS devices may request (by ioctl) that they want to receive
+ messages when clients bind or unbind as repliers. If such a
+ message is sent when their incoming queue is full, it is instead
+ saved onto a set-aside queue, and delivered later. This setting
+ determines the size of the set-aside queue; if the limit is reached,
+ a special "bind/unbind event messages were lost" message is queued
+ instead, and any further bind/unbind messages will be lost, until
+ such time as the special message can be delivered.
+
+ If unsure, choose the default.
+
+endif # KBUS
+
diff --git a/ipc/Makefile b/ipc/Makefile
index 9075e17..db692ad 100644
--- a/ipc/Makefile
+++ b/ipc/Makefile
@@ -2,6 +2,11 @@
# Makefile for the linux ipc.
#

+ifeq ($(CONFIG_KBUS_DEBUG),y)
+ CFLAGS_kbus_main.o = -DDEBUG
+ CFLAGS_kbus_report.o = -DDEBUG
+endif
+
obj-$(CONFIG_SYSVIPC_COMPAT) += compat.o
obj-$(CONFIG_SYSVIPC) += util.o msgutil.o msg.o sem.o shm.o ipcns_notifier.o syscall.o
obj-$(CONFIG_SYSVIPC_SYSCTL) += ipc_sysctl.o
@@ -9,4 +14,8 @@ obj_mq-$(CONFIG_COMPAT) += compat_mq.o
obj-$(CONFIG_POSIX_MQUEUE) += mqueue.o msgutil.o $(obj_mq-y)
obj-$(CONFIG_IPC_NS) += namespace.o
obj-$(CONFIG_POSIX_MQUEUE_SYSCTL) += mq_sysctl.o
+obj-$(CONFIG_KBUS) += kbus.o
+
+kbus-y := kbus_main.o
+kbus-$(CONFIG_PROC_FS) += kbus_report.o

--
1.7.4.1


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