hv_pcifront_read_config(9)

💖 hv_pcifront_read_config(9) 💖

okay bestie, this is the Kernel API Manual page for hv_pcifront_read_config(9), and we're folding that name right in near the top so you know exactly what's up. It's literally about reading configuration space, and it's giving PCI bus main character energy. 🦋

✨ NAME ✨

hv_pcifront_read_config — read configuration space. That's the whole plot, no cap. 💅

🌸 SYNOPSIS 🌸

The call is exactly this:

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

🎀 ARGUMENTS 🎀

• bus — the PCI Bus structure. That's the bus context, bestie. 🚌
• devfn — device/function. Yep, which device/function we're dealing with.
• where — offset from base. That's the config-space offset.
• size — byte/word/dword. Those are the size options.
• val — value to be read. That's the value being read. 💖

🔥 RETURN 🔥

• PCIBIOS_SUCCESSFUL — this is what you get on success. 🎉
• PCIBIOS_DEVICE_NOT_FOUND — this is what you get on failure. 😭

🌈 SEE ALSO 🌈

The kernel file to peek at is ./drivers/pci/controller/pci-hyperv.c. And here is the whole related-refs friend group, every single one, periodt:

• struct hv_msi_desc(9)
• struct hv_msi_desc2(9)
• struct tran_int_desc(9)
• 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_write_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 sign-off: this page's source path is ./drivers/pci/controller, its version/date stamp is October 2026, and the page is hv_pcifront_read_config(9). Bye bestie, go read some configuration space and slay 💅✨