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RISC-V International
RISC-V International

RISC-V Summit 2020 presentation

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Fueling the Datasphere How RISC-V Enables the Storage Ecosystem RISC-V SUMMIT 2020 Richard Bohn Engineering Director
01 Our RISC-V Story 02 Microprocessor Details 03 RISC-V at the Edge
Our RISC-V Story
Seagate is the Data Storage Industry Leader $10B+ Annual Revenue 400+ EB Shipped Annually Storage Innovation 40+ Years World’s Data Stored 40%
Expertise Across all Technology Fields 5+ Global Storage System OEMs Cloud Providers 5+ Leading Technology Companies 5+ Global We provide storage infrastructure for most of the world's data.
Background Global Data Explosion • Market transformations driving new storage needs • Mainframe → client-server → mobile-cloud → edge • Data creation expected to grow to 175ZB by 2025 RISC-V in the Storage Ecosystem • New technologies are driving new processing requirements • RISC-V meets those needs in a way not met by the marketplace • The edge requires new security and computation innovation • RISC-V driving new wave of innovation in domain-specific solutions Enabling Technologies • Heat-assisted magnetic recording (HAMR) driving capacity gains • MACH.2 multi-actuator technology enables high-performance access to mass quantities of data generated on the edge
Seagate’s RISC-V Story 2019- Today Origins of RISC-V Work • For years, Seagate shipped a simple internally-designed CPU with a custom ISA • Firmware developed using a fancy assembler, but no real compiler support • In 2015, Seagate decided to develop compiler support for this CPU as a side project • Discovered the RISC-V project and decided to instead design a new CPU • New CPU soon grew to be an aggressive out-of-order core Production-Capable Development • Tuned processor design point to target internal workloads where performance needs not being met with existing solutions • Expanded efforts to support production-quality feature set and verification • Actively engaged RISC-V community and standards development Next-Generation Capabilities • Next-generation development targeting new workloads • New area-optimized core targeting auxiliary and security applications • Coherent fabric development for multi-core deployments 2017- 2018 2015- 2016
Solving Domain-Specific Pain Point of Real-Time Processing Microarchitecture optimization, parallelism, and latency reduction Seagate RISC-V Core Legacy Core Disturbance detection filter (computational cycles) 3× Reduction RISC-V-Enabled Solution Functional Example: Motion Control Use Case Hard drive capacity is projected to exceed 50TB by 2026 At 50TB, track density will exceed 1 million tracks per inch (TPI) (2.4 nm positioning accuracy) The Problem Multi-stage actuators for coarse movement and fine positioning Real-Time Processing • Disturbance detection algorithms • Adaptive control features • Feed-forward compensation • High sample-rate computation Constraints • Power, space, and cost The Required Innovation
Microprocessor Details
Seagate’s First RISC-V High-Performance Core • Started development in 2015 • Highly configurable microarchitecture and feature set • Powering a fully functional hard drive demonstration • Combines features needed by real-time control applications with performance capabilities required for future workloads • Initial deployment targeting high-performance servo-actuator control workload Overview
High-Performance Core Technical Details (Current Silicon) • RV32IMFCN • Machine and user modes • Speculative out-of-order pipeline • 4-wide fetch and dispatch • 8-wide issue (peak) • High-performance instruction fetch: branch prediction, return address stack, loop buffer • Dual-ported load-store unit • Large L1 tightly-integrated memories • Multi-way L1 caches • Decoupled high-performance FPU • PLIC (Platform-Level Interrupt Controller​) • Native ECC support • RISC-V Debug and Trace Support
High-Performance Core Pipeline Address generation Alignment, rotation, error correction Fetch buffer IW, FPW, LSQ, ROB entries dispatched IW, FPW entries valid LSQ, RU entries valid LSU result formatting and store forwarding application, write-back of loads LSU SRAM access, store forward search Retirement, exception handling Execute and write- back of most integer ops, LSU AGEN Issue search SRAM access Decode, register rename
High-Performance Core Pipeline
Seagate High-Performance Core 1.00 1.00 1.00 0.77 0.93 0.86 2.04 3.12 3.26 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 Internal Workload #1 Internal Workload #2 Internal Workload #3 Processor A Processor B Seagate High-Performance Core
Area-Optimized Cores Overview • Began development in 2019 • Highly configurable microarchitecture and feature set • Enables auxiliary workloads and security applications • Targets small-footprint implementation of features over performance
Area-Optimized Cores Technical Details • RV32/64IMCBN • Machine, supervisor, and user modes • SV39/SV32 • 5-stage, single-issue, in-order pipeline • CLIC (Core-Local Interrupt Controller) • Enhanced PMP • Focus on optional security features • Native ECC support • RISC-V debug and trace
RISC-V at the Edge
RISC-V at the Edge Challenges of Data Movement • Edge devices generate massive amounts of data • Connectivity to the cloud is not sufficient to transport all data • How to quickly make decisions based on this massive amount of edge data? Need computation on edge devices. • How to keep data at the edge secure and trustworthy? RISC-V Enables Innovation at the Edge • Workloads are numerous and varied • Constraints on power and latency limit current applications • Domains-specific architectures enable use cases not previously possible with general purpose solutions • RISC-V opens up domain- specific computation to all RISC-V Strengthens Security at the Edge • Open, formally-proven security models • Best-in-class protections built in collaboration with top security experts across many companies
RISC-V at the Edge More RISC-V Summit 2020 Talks • “RISC-V: Accelerating Innovation in Data Storage” – Dr. John Morris • “Data on the Move: A RISC-V Opportunity” – Bruno Masson • “Comprehensive Pre-Si Verification of RISC-V Cores in a Storage Controller” – Bill McSpadden • “Data Trustworthiness at the Edge” – Manuel Offenberg 1.00 3.04 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 Seagate HPC Seagate HPC + Custom Tensor Ops AI Inference Performance
The Power of the RISC-V Ecosystem RISC-V Enables CPU Development for the Masses • CPU development is challenging, but RISC-V’s robust ecosystem makes it much easier • Strong commercial support is available for all phases of the design process • Direct collaborations through specification development enrich everyone. Get involved! RISC-V International Strategic Member Representation • Seagate is honored to serve on the RISC-V International Board of Directors as a representative for the strategic class of members • Feel free to reach out to Richard Bohn at richard.bohn@seagate.com with your thoughts on the future of RISC-V International
Thank you Richard Bohn richard.bohn@seagate.com RISC-V SUMMIT 2020

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Fueling the datasphere how RISC-V enables the storage ecosystem

  • 1. Fueling the Datasphere How RISC-V Enables the Storage Ecosystem RISC-V SUMMIT 2020 Richard Bohn Engineering Director
  • 2. 01 Our RISC-V Story 02 Microprocessor Details 03 RISC-V at the Edge
  • 4. Seagate is the Data Storage Industry Leader $10B+ Annual Revenue 400+ EB Shipped Annually Storage Innovation 40+ Years World’s Data Stored 40%
  • 5. Expertise Across all Technology Fields 5+ Global Storage System OEMs Cloud Providers 5+ Leading Technology Companies 5+ Global We provide storage infrastructure for most of the world's data.
  • 6. Background Global Data Explosion • Market transformations driving new storage needs • Mainframe → client-server → mobile-cloud → edge • Data creation expected to grow to 175ZB by 2025 RISC-V in the Storage Ecosystem • New technologies are driving new processing requirements • RISC-V meets those needs in a way not met by the marketplace • The edge requires new security and computation innovation • RISC-V driving new wave of innovation in domain-specific solutions Enabling Technologies • Heat-assisted magnetic recording (HAMR) driving capacity gains • MACH.2 multi-actuator technology enables high-performance access to mass quantities of data generated on the edge
  • 7. Seagate’s RISC-V Story 2019- Today Origins of RISC-V Work • For years, Seagate shipped a simple internally-designed CPU with a custom ISA • Firmware developed using a fancy assembler, but no real compiler support • In 2015, Seagate decided to develop compiler support for this CPU as a side project • Discovered the RISC-V project and decided to instead design a new CPU • New CPU soon grew to be an aggressive out-of-order core Production-Capable Development • Tuned processor design point to target internal workloads where performance needs not being met with existing solutions • Expanded efforts to support production-quality feature set and verification • Actively engaged RISC-V community and standards development Next-Generation Capabilities • Next-generation development targeting new workloads • New area-optimized core targeting auxiliary and security applications • Coherent fabric development for multi-core deployments 2017- 2018 2015- 2016
  • 8. Solving Domain-Specific Pain Point of Real-Time Processing Microarchitecture optimization, parallelism, and latency reduction Seagate RISC-V Core Legacy Core Disturbance detection filter (computational cycles) 3× Reduction RISC-V-Enabled Solution Functional Example: Motion Control Use Case Hard drive capacity is projected to exceed 50TB by 2026 At 50TB, track density will exceed 1 million tracks per inch (TPI) (2.4 nm positioning accuracy) The Problem Multi-stage actuators for coarse movement and fine positioning Real-Time Processing • Disturbance detection algorithms • Adaptive control features • Feed-forward compensation • High sample-rate computation Constraints • Power, space, and cost The Required Innovation
  • 10. Seagate’s First RISC-V High-Performance Core • Started development in 2015 • Highly configurable microarchitecture and feature set • Powering a fully functional hard drive demonstration • Combines features needed by real-time control applications with performance capabilities required for future workloads • Initial deployment targeting high-performance servo-actuator control workload Overview
  • 11. High-Performance Core Technical Details (Current Silicon) • RV32IMFCN • Machine and user modes • Speculative out-of-order pipeline • 4-wide fetch and dispatch • 8-wide issue (peak) • High-performance instruction fetch: branch prediction, return address stack, loop buffer • Dual-ported load-store unit • Large L1 tightly-integrated memories • Multi-way L1 caches • Decoupled high-performance FPU • PLIC (Platform-Level Interrupt Controller​) • Native ECC support • RISC-V Debug and Trace Support
  • 12. High-Performance Core Pipeline Address generation Alignment, rotation, error correction Fetch buffer IW, FPW, LSQ, ROB entries dispatched IW, FPW entries valid LSQ, RU entries valid LSU result formatting and store forwarding application, write-back of loads LSU SRAM access, store forward search Retirement, exception handling Execute and write- back of most integer ops, LSU AGEN Issue search SRAM access Decode, register rename
  • 14. Seagate High-Performance Core 1.00 1.00 1.00 0.77 0.93 0.86 2.04 3.12 3.26 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 Internal Workload #1 Internal Workload #2 Internal Workload #3 Processor A Processor B Seagate High-Performance Core
  • 15. Area-Optimized Cores Overview • Began development in 2019 • Highly configurable microarchitecture and feature set • Enables auxiliary workloads and security applications • Targets small-footprint implementation of features over performance
  • 16. Area-Optimized Cores Technical Details • RV32/64IMCBN • Machine, supervisor, and user modes • SV39/SV32 • 5-stage, single-issue, in-order pipeline • CLIC (Core-Local Interrupt Controller) • Enhanced PMP • Focus on optional security features • Native ECC support • RISC-V debug and trace
  • 18. RISC-V at the Edge Challenges of Data Movement • Edge devices generate massive amounts of data • Connectivity to the cloud is not sufficient to transport all data • How to quickly make decisions based on this massive amount of edge data? Need computation on edge devices. • How to keep data at the edge secure and trustworthy? RISC-V Enables Innovation at the Edge • Workloads are numerous and varied • Constraints on power and latency limit current applications • Domains-specific architectures enable use cases not previously possible with general purpose solutions • RISC-V opens up domain- specific computation to all RISC-V Strengthens Security at the Edge • Open, formally-proven security models • Best-in-class protections built in collaboration with top security experts across many companies
  • 19. RISC-V at the Edge More RISC-V Summit 2020 Talks • “RISC-V: Accelerating Innovation in Data Storage” – Dr. John Morris • “Data on the Move: A RISC-V Opportunity” – Bruno Masson • “Comprehensive Pre-Si Verification of RISC-V Cores in a Storage Controller” – Bill McSpadden • “Data Trustworthiness at the Edge” – Manuel Offenberg 1.00 3.04 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 Seagate HPC Seagate HPC + Custom Tensor Ops AI Inference Performance
  • 20. The Power of the RISC-V Ecosystem RISC-V Enables CPU Development for the Masses • CPU development is challenging, but RISC-V’s robust ecosystem makes it much easier • Strong commercial support is available for all phases of the design process • Direct collaborations through specification development enrich everyone. Get involved! RISC-V International Strategic Member Representation • Seagate is honored to serve on the RISC-V International Board of Directors as a representative for the strategic class of members • Feel free to reach out to Richard Bohn at richard.bohn@seagate.com with your thoughts on the future of RISC-V International

Notas do Editor

  1. Through expertise in microarchitecture optimization, and targeted focus on instruction-specific latency reduction, the performance of critical servo-algorithms has been significantly enhanced by this novel-processor. As an example, we have seen a 3x reduction in the cycles required to perform Disturbance-detection computation.  The efficient performance enabled by this technology will directly enable the future deployment of Seagate's mass-capacity solutions.
  2. In the left inset picture see Seagate’s first RISC-V core...specifically designed by Seagate for High-Performance real-time processing and available in production-capable silicon today. Building on core RISC-V technology, this processor is powering the world's first RISC-V enabled HDD demonstration. More information on this processor can be found in the breakout session "Fueling the Datasphere" by Seagate's Richard Bohn.