![Ganapatrao Kulkarni](/assets/img/avatar_default.png)
Add DT bindings for numa mapping of memory, CPUs and IOs. Reviewed-by: Robert Richter <rrichter@cavium.com> Signed-off-by: Ganapatrao Kulkarni <gkulkarni@caviumnetworks.com> Signed-off-by: David Daney <david.daney@cavium.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
276 lines
6.8 KiB
Plaintext
276 lines
6.8 KiB
Plaintext
==============================================================================
|
|
NUMA binding description.
|
|
==============================================================================
|
|
|
|
==============================================================================
|
|
1 - Introduction
|
|
==============================================================================
|
|
|
|
Systems employing a Non Uniform Memory Access (NUMA) architecture contain
|
|
collections of hardware resources including processors, memory, and I/O buses,
|
|
that comprise what is commonly known as a NUMA node.
|
|
Processor accesses to memory within the local NUMA node is generally faster
|
|
than processor accesses to memory outside of the local NUMA node.
|
|
DT defines interfaces that allow the platform to convey NUMA node
|
|
topology information to OS.
|
|
|
|
==============================================================================
|
|
2 - numa-node-id
|
|
==============================================================================
|
|
|
|
For the purpose of identification, each NUMA node is associated with a unique
|
|
token known as a node id. For the purpose of this binding
|
|
a node id is a 32-bit integer.
|
|
|
|
A device node is associated with a NUMA node by the presence of a
|
|
numa-node-id property which contains the node id of the device.
|
|
|
|
Example:
|
|
/* numa node 0 */
|
|
numa-node-id = <0>;
|
|
|
|
/* numa node 1 */
|
|
numa-node-id = <1>;
|
|
|
|
==============================================================================
|
|
3 - distance-map
|
|
==============================================================================
|
|
|
|
The optional device tree node distance-map describes the relative
|
|
distance (memory latency) between all numa nodes.
|
|
|
|
- compatible : Should at least contain "numa-distance-map-v1".
|
|
|
|
- distance-matrix
|
|
This property defines a matrix to describe the relative distances
|
|
between all numa nodes.
|
|
It is represented as a list of node pairs and their relative distance.
|
|
|
|
Note:
|
|
1. Each entry represents distance from first node to second node.
|
|
The distances are equal in either direction.
|
|
2. The distance from a node to self (local distance) is represented
|
|
with value 10 and all internode distance should be represented with
|
|
a value greater than 10.
|
|
3. distance-matrix should have entries in lexicographical ascending
|
|
order of nodes.
|
|
4. There must be only one device node distance-map which must
|
|
reside in the root node.
|
|
5. If the distance-map node is not present, a default
|
|
distance-matrix is used.
|
|
|
|
Example:
|
|
4 nodes connected in mesh/ring topology as below,
|
|
|
|
0_______20______1
|
|
| |
|
|
| |
|
|
20 20
|
|
| |
|
|
| |
|
|
|_______________|
|
|
3 20 2
|
|
|
|
if relative distance for each hop is 20,
|
|
then internode distance would be,
|
|
0 -> 1 = 20
|
|
1 -> 2 = 20
|
|
2 -> 3 = 20
|
|
3 -> 0 = 20
|
|
0 -> 2 = 40
|
|
1 -> 3 = 40
|
|
|
|
and dt presentation for this distance matrix is,
|
|
|
|
distance-map {
|
|
compatible = "numa-distance-map-v1";
|
|
distance-matrix = <0 0 10>,
|
|
<0 1 20>,
|
|
<0 2 40>,
|
|
<0 3 20>,
|
|
<1 0 20>,
|
|
<1 1 10>,
|
|
<1 2 20>,
|
|
<1 3 40>,
|
|
<2 0 40>,
|
|
<2 1 20>,
|
|
<2 2 10>,
|
|
<2 3 20>,
|
|
<3 0 20>,
|
|
<3 1 40>,
|
|
<3 2 20>,
|
|
<3 3 10>;
|
|
};
|
|
|
|
==============================================================================
|
|
4 - Example dts
|
|
==============================================================================
|
|
|
|
Dual socket system consists of 2 boards connected through ccn bus and
|
|
each board having one socket/soc of 8 cpus, memory and pci bus.
|
|
|
|
memory@c00000 {
|
|
device_type = "memory";
|
|
reg = <0x0 0xc00000 0x0 0x80000000>;
|
|
/* node 0 */
|
|
numa-node-id = <0>;
|
|
};
|
|
|
|
memory@10000000000 {
|
|
device_type = "memory";
|
|
reg = <0x100 0x0 0x0 0x80000000>;
|
|
/* node 1 */
|
|
numa-node-id = <1>;
|
|
};
|
|
|
|
cpus {
|
|
#address-cells = <2>;
|
|
#size-cells = <0>;
|
|
|
|
cpu@0 {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0x0>;
|
|
enable-method = "psci";
|
|
/* node 0 */
|
|
numa-node-id = <0>;
|
|
};
|
|
cpu@1 {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0x1>;
|
|
enable-method = "psci";
|
|
numa-node-id = <0>;
|
|
};
|
|
cpu@2 {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0x2>;
|
|
enable-method = "psci";
|
|
numa-node-id = <0>;
|
|
};
|
|
cpu@3 {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0x3>;
|
|
enable-method = "psci";
|
|
numa-node-id = <0>;
|
|
};
|
|
cpu@4 {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0x4>;
|
|
enable-method = "psci";
|
|
numa-node-id = <0>;
|
|
};
|
|
cpu@5 {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0x5>;
|
|
enable-method = "psci";
|
|
numa-node-id = <0>;
|
|
};
|
|
cpu@6 {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0x6>;
|
|
enable-method = "psci";
|
|
numa-node-id = <0>;
|
|
};
|
|
cpu@7 {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0x7>;
|
|
enable-method = "psci";
|
|
numa-node-id = <0>;
|
|
};
|
|
cpu@8 {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0x8>;
|
|
enable-method = "psci";
|
|
/* node 1 */
|
|
numa-node-id = <1>;
|
|
};
|
|
cpu@9 {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0x9>;
|
|
enable-method = "psci";
|
|
numa-node-id = <1>;
|
|
};
|
|
cpu@a {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0xa>;
|
|
enable-method = "psci";
|
|
numa-node-id = <1>;
|
|
};
|
|
cpu@b {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0xb>;
|
|
enable-method = "psci";
|
|
numa-node-id = <1>;
|
|
};
|
|
cpu@c {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0xc>;
|
|
enable-method = "psci";
|
|
numa-node-id = <1>;
|
|
};
|
|
cpu@d {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0xd>;
|
|
enable-method = "psci";
|
|
numa-node-id = <1>;
|
|
};
|
|
cpu@e {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0xe>;
|
|
enable-method = "psci";
|
|
numa-node-id = <1>;
|
|
};
|
|
cpu@f {
|
|
device_type = "cpu";
|
|
compatible = "arm,armv8";
|
|
reg = <0x0 0xf>;
|
|
enable-method = "psci";
|
|
numa-node-id = <1>;
|
|
};
|
|
};
|
|
|
|
pcie0: pcie0@848000000000 {
|
|
compatible = "arm,armv8";
|
|
device_type = "pci";
|
|
bus-range = <0 255>;
|
|
#size-cells = <2>;
|
|
#address-cells = <3>;
|
|
reg = <0x8480 0x00000000 0 0x10000000>; /* Configuration space */
|
|
ranges = <0x03000000 0x8010 0x00000000 0x8010 0x00000000 0x70 0x00000000>;
|
|
/* node 0 */
|
|
numa-node-id = <0>;
|
|
};
|
|
|
|
pcie1: pcie1@948000000000 {
|
|
compatible = "arm,armv8";
|
|
device_type = "pci";
|
|
bus-range = <0 255>;
|
|
#size-cells = <2>;
|
|
#address-cells = <3>;
|
|
reg = <0x9480 0x00000000 0 0x10000000>; /* Configuration space */
|
|
ranges = <0x03000000 0x9010 0x00000000 0x9010 0x00000000 0x70 0x00000000>;
|
|
/* node 1 */
|
|
numa-node-id = <1>;
|
|
};
|
|
|
|
distance-map {
|
|
compatible = "numa-distance-map-v1";
|
|
distance-matrix = <0 0 10>,
|
|
<0 1 20>,
|
|
<1 1 10>;
|
|
};
|