Linux PCI Device Lead

2 weeks ago

Hyderabad, India SEMI LEAF Full time

Description :Architect and Lead PCI Subsystem Development :- Drive design, development, and maintenance of PCI and PCIe subsystems and drivers in the Linux kernel.- Ensure seamless enumeration, configuration, power management, and hotplug support for PCI devices.Device Enablement and Bring-up :- Lead platform bring-up activities involving PCI/PCIe devices (e.g., network, storage, GPU, NVMe).- Validate and debug device-tree or ACPI configurations for PCI host bridges and endpoints.Kernel and Firmware Interaction :- Collaborate with firmware/bootloader teams for correct BAR, MSI/MSI-X, and IOMMU configurations.- Work closely with architecture teams to support secure boot and DMA protection for PCI devices.Performance and Power Optimization :- Analyze PCI bandwidth, latency, and power bottlenecks.- Implement ASPM, LTR, and other low-power states in compliance with PCIe specs.Debugging and Issue Resolution :- Use Linux tools (lspci, setpci, tracepoints, ftrace, perf, etc.) and oscilloscopes/analyzers for low-level debugging.- Root-cause platform PCI failures and compatibility issues across hardware and kernel versions.Upstream and Compliance :- Contribute patches upstream to the Linux kernel PCI subsystem.- Ensure compliance with PCI-SIG and Linux kernel community best practices.Cross-Team Collaboration :- Interface with SoC, BIOS/UEFI, board, and validation teams to ensure robust PCIe device support across platforms.Required Expertise :- Deep understanding of Linux kernel internals, especially drivers/pci and subsystems like hot plug, MSI, IOMMU, DMA API.- Hands-on experience with PCIe Gen3/Gen4/Gen5 devices and related PHY bring-up issues.- Familiarity with ARM64 and x86 architectures, DT/ACPI handling for PCI devices.- Proficient in C programming, Linux kernel debugging (GDB, crash dumps), and tools like dmesg, lspci, pcie_check.- Expertise in power management (runtime, suspend/resume flows) for PCI devices.- Experience with Secure Boot, TrustZone, and virtualization passthrough (VFIO/SR-IOV) for PCIe devices is a strong plus.- Experience using Yocto, Buildroot, or other embedded Linux build systems. (ref:hirist.tech)

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