hv_pcifront_write_config(9)

💖 hv_pcifront_write_config(9) — your Kernel API Manual bestie 🫶

okay so this is the Kernel API Manual page for hv_pcifront_write_config, and it’s giving “we write to PCI configuration space and we do it cutely.” no cap ✨

🌸 NAME 🌸

hv_pcifront_write_config — write configuration space, bestie. That’s the whole name. Periodt 💅

🦋 SYNOPSIS 🦋

       int hv_pcifront_write_config (struct pci_bus *bus , unsigned int devfn ,
       int where , int size , u32 val );

🎀 ARGUMENTS 🎀

• bus — the PCI Bus structure. That’s the main-character bus, okay? 🚌
• devfn — Device/function. The little device+function coordinate, iykyk 🎯
• where — Offset from base. Like where in the config space we’re poking around 📍
• size — Byte/word/dword. So one byte, one word, or one dword — pick your size, bestie 📏
• val — Value to be written to device. The actual value getting sent to the device 💌

💜 RETURN 💜

so the return sitch is: PCIBIOS_SUCCESSFUL on success, and PCIBIOS_DEVICE_NOT_FOUND on failure. That’s the success/failure tea ☕✨

🌈 SEE ALSO 🌈

• Kernel file: ./drivers/pci/controller/pci-hyperv.c
• Structs: struct hv_msi_desc(9), struct hv_msi_desc2(9), struct tran_int_desc(9)
• Functions: hv_irq_retarget_interrupt(9), hv_pci_generic_compl(9), devfn_to_wslot(9), wslot_to_devfn(9), _hv_pcifront_read_config(9), _hv_pcifront_write_config(9), hv_pcifront_read_config(9), hv_pci_read_config_compl(9), hv_read_config_block(9), hv_pci_write_config_compl(9), hv_write_config_block(9), hv_register_block_invalidate(9), hv_msi_free(9), hv_compose_msi_msg(9), hv_pcie_init_irq_domain(9), get_bar_size(9), survey_child_resources(9), prepopulate_bars(9), create_root_hv_pci_bus(9), q_resource_requirements(9), new_pcichild_device(9), get_pcichild_wslot(9), pci_devices_present_work(9), hv_pci_start_relations_work(9), hv_pci_devices_present(9), hv_pci_devices_present2(9), hv_eject_device_work(9), hv_pci_eject_device(9), hv_pci_onchannelcallback(9), hv_pci_protocol_negotiation(9), hv_pci_free_bridge_windows(9), hv_pci_allocate_bridge_windows(9), hv_allocate_config_window(9), hv_pci_enter_d0(9), hv_pci_query_relations(9), hv_send_resources_allocated(9), hv_send_resources_released(9), hv_pci_probe(9), hv_pci_remove(9)

cute lil sign-off 💖 source/version: ./drivers/pci/controller • date: October 2026 • title: hv_pcifront_write_config(9). That’s the page, bestie — slay and stay hydrated 🫶✨