MPAMCFG_MBW_PROP, MPAM Memory Bandwidth Proportional Stride Partition Configuration Register
The MPAMCFG_MBW_PROP characteristics are:
Purpose
Controls the proportional stride of memory bandwidth that the PARTID selected by MPAMCFG_PART_SEL uses. MPAMCFG_MBW_PROP_s controls the bandwidth proportional stride for the Secure PARTID selected by the Secure instance of MPAMCFG_PART_SEL. MPAMCFG_MBW_PROP_ns controls the bandwidth proportional stride for the Non-secure PARTID selected by the Non-secure instance of MPAMCFG_PART_SEL.
Proportional stride is a relative cost of bandwidth requested by one PARTID in relation to the costs of the bandwidths requested by each other PARTID also competing to use the bandwidth.
If MPAMF_IDR.HAS_RIS is 1, the control settings accessed are those of the resource instance currently selected by MPAMCFG_PART_SEL.RIS and the PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL.
Configuration
The power domain of MPAMCFG_MBW_PROP is IMPLEMENTATION DEFINED.
This register is present only when MPAMF_IDR.HAS_MBW_PART == 1 and MPAMF_MBW_IDR.HAS_PROP == 1. Otherwise, direct accesses to MPAMCFG_MBW_PROP are RES0.
Attributes
MPAMCFG_MBW_PROP is a 32-bit register.
Field descriptions
The MPAMCFG_MBW_PROP bit assignments are:
EN, bit [31]
Enable proportional stride bandwidth partitioning.
EN | Meaning |
---|---|
0b0 |
The selected partition is not regulated by proportional stride bandwidth partitioning. |
0b1 |
The selected partition has bandwidth usage regulated by proportional stride bandwidth partitioning as controlled by STRIDEM1. |
Bits [30:16]
Reserved, RES0.
STRIDEM1, bits [15:0]
Memory bandwidth stride minus 1 allocated to the partition selected by MPAMCFG_PART_SEL. STRIDEM1 represents the normalized cost of bandwidth consumption by the partition.
The proportional stride partitioning control parameter is an unsigned integer representing the normalized cost to a partition for consuming bandwidth. Larger values have a larger cost and correspond to a lesser allocation of bandwidth while smaller values indicate a lesser cost and therefore a higher allocation of bandwidth.
The implemented width of STRIDEM1 is given in MPAMF_MBW_IDR.BWA_WD.
Accessing the MPAMCFG_MBW_PROP
This register is within the MPAM feature page memory frames. In a system that supports Secure and Non-secure memory maps, there must be both Secure and Non-secure MPAM feature pages.
MPAMCFG_MBW_PROP_s must be accessible from the Secure MPAM feature page. MPAMCFG_MBW_PROP_ns must be accessible from the Non-secure MPAM feature page.
MPAMCFG_MBW_PROP_s and MPAMCFG_MBW_PROP_ns must be separate registers. The Secure instance (MPAMCFG_MBW_PROP_s) accesses the memory proportional stride bandwidth partitioning used for Secure PARTIDs, and the Non-secure instance (MPAMCFG_MBW_PROP_ns) accesses the memory proportional stride bandwidth partitioning used for Non-secure PARTIDs.
When RIS is implemented, loads and stores to MPAMCFG_MBW_PROP access the memory proportional stride bandwidth partitioning configuration settings for the bandwidth resource instance selected by MPAMCFG_PART_SEL.RIS and the PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL.
When RIS is not implemented, loads and stores to MPAMCFG_MBW_PROP access the memory proportional stride bandwidth partitioning configuration settings for the PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL.
When PARTID narrowing is implemented, loads and stores to MPAMCFG_MBW_PROP access the memory proportional stride bandwidth partitioning configuration settings for the internal PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL, and MPAMCFG_PART_SEL.INTERNAL must be 1.
When PARTID narrowing is not implemented, loads and stores to MPAMCFG_MBW_PROP access the memory proportional stride bandwidth partitioning configuration settings for the request PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL, and MPAMCFG_PART_SEL.INTERNAL must be 0.
MPAMCFG_MBW_PROP can be accessed through the memory-mapped interfaces:
Component | Frame | Offset | Instance |
---|---|---|---|
MPAM | MPAMF_BASE_s | 0x0500 | MPAMCFG_MBW_PROP_s |
Accesses on this interface are RW.
Component | Frame | Offset | Instance |
---|---|---|---|
MPAM | MPAMF_BASE_ns | 0x0500 | MPAMCFG_MBW_PROP_ns |
Accesses on this interface are RW.