get_csr_addr(9)

✨ get_csr_addr(9) — Kernel API Manual, now with group-chat energy 💅

okay so bestie, this is the Kernel API Manual page for get_csr_addr(9), and it's short but it's iconic. let's get into it before the vibe check expires 🦋

🌸 NAME 🌸

get_csr_addr — return te iomem address for offset. yes, te. we are preserving the original typo because facts are sacred, even the silly ones 😭

🦋 SYNOPSIS 🦋

here's the signature, copied exactly because we do not mess with code:

void __iomem * get_csr_addr (const struct hfi1_devdata *dd , u32 offset
);

💖 ARGUMENTS 💖

• dd — the dd device — that's the whole description, bestie, we're not adding lore 🫶
• offset — the offset of the CSR within bar0 — exactly that, periodt ✨

✨ RETURN ✨

The iomem address to use in subsequent writeq/readq operations. that's the return value, and it's the whole return value 💜

🔥 SEE ALSO 🔥

okay the cross-refs are stacked. The kernel file is ./drivers/infiniband/hw/hfi1/chip.c, and here are all the friends:

• hfi1_addr_from_offset(9)
• read_csr(9)
• write_csr(9)
• update_xmit_counters(9)
• apply_link_downgrade_policy(9)
• is_rcv_avail_int(9)
• is_rcv_urgent_int(9)
• general_interrupt(9)
• hfi1_rcd_eoi_intr(9)
• hfi1_netdev_rx_napi(9)
• data_vls_operational(9)
• encode_rcv_header_entry_size(9)
• hfi1_validate_rcvhdrcnt(9)
• set_hdrq_regs(9)
• update_statusp(9)
• wait_logical_linkstate(9)
• read_mod_write(9)
• set_intr_bits(9)
• set_up_interrupts(9)
• hfi1_get_qp_map(9)
• init_qpmap_table(9)
• init_qos(9)
• hfi1_init_dd(9)
• create_pbc(9)

source/version: ./drivers/infiniband/hw/hfi1 · date: October 2026 · page: get_csr_addr(9). bye bestie, stay sparkly 💖