epf_ntb_db_mw_bar_init(9)

💅 epf_ntb_db_mw_bar_init(9) — bestie's fave kernel API manual, no cap

okay so this is from the Kernel API Manual, and honestly it lives right in ./drivers/pci/endpoint/functions, which is basically the main character address of PCI endpoint stuff ✨

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🎀 NAME 🎀

epf_ntb_db_mw_bar_init — the one that configures Doorbell and Memory window BARs, periodt 💅

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🌸 SYNOPSIS 🌸

int epf_ntb_db_mw_bar_init (struct epf_ntb *ntb , enum
       pci_epc_interface_type type );

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🦋 ARGUMENTS 🦋

• ntb — the NTB device, aka the literal wingman that facilitates communication between HOST1 and HOST2 🫶
• type — which interface we're on: PRIMARY interface or SECONDARY interface, pick your fighter 💖

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⭐ DESCRIPTION ⭐

so basically this is a wrapper for epf_ntb_alloc_peer_mem and pci_epc_set_bar, and what it does is allocate memory in the OB address space of HOST2 and configure the BAR of HOST1. two hosts, one function, iconic behaviour fr fr 🔥

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💜 SEE ALSO 💜

• Kernel file ./drivers/pci/endpoint/functions/pci-epf-ntb.c
• epf_ntb_link_up(9)
• epf_ntb_configure_mw(9)
• epf_ntb_teardown_mw(9)
• epf_ntb_configure_msi(9)
• epf_ntb_configure_msix(9)
• epf_ntb_configure_db(9)
• epf_ntb_teardown_db(9)
• epf_ntb_cmd_handler(9)
• epf_ntb_peer_spad_bar_clear(9)
• epf_ntb_peer_spad_bar_set(9)
• epf_ntb_config_sspad_bar_clear(9)
• epf_ntb_config_sspad_bar_set(9)
• epf_ntb_config_spad_bar_free(9)
• epf_ntb_config_spad_bar_alloc(9)
• epf_ntb_config_spad_bar_alloc_interface(9)
• epf_ntb_free_peer_mem(9)
• epf_ntb_db_mw_bar_clear(9)
• epf_ntb_db_mw_bar_cleanup(9)
• epf_ntb_configure_interrupt(9)
• epf_ntb_alloc_peer_mem(9)
• epf_ntb_epc_create_interface(9)
• epf_ntb_epc_create(9)
• epf_ntb_init_epc_bar_interface(9)
• epf_ntb_init_epc_bar(9)
• epf_ntb_epc_init_interface(9)
• epf_ntb_epc_cleanup_interface(9)
• epf_ntb_epc_cleanup(9)
• epf_ntb_epc_init(9)
• epf_ntb_bind(9)
• epf_ntb_unbind(9)
• epf_ntb_add_cfs(9)
• epf_ntb_probe(9)

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and that's the whole vibe bestie 💖 this page is from ./drivers/pci/endpoint/functions, dated October 2026, and it's giving epf_ntb_db_mw_bar_init(9) energy all the way. slay, go read your kernel source, ily 🎀✨