pci_reset_function_locked(9)

💖 NAME 💖

okay so this is pci_reset_function_locked(9) from the Kernel API Manual, and the whole assignment is: quiesce and reset a PCI device function. 💅✨

✨ SYNOPSIS ✨

the signature is literally:

int pci_reset_function_locked (struct pci_dev *dev );

🎀 ARGUMENTS 🎀

• dev — PCI device to reset 🫶

🦋 DESCRIPTION 🦋

Some devices allow an individual function to be reset without affecting other functions in the same device. That's the dream scenario, bestie. ✨ But the PCI device must be responsive to PCI config space in order to use this function — no config-space replies, no reset magic.

This function does not just reset the PCI portion of a device, but clears all the state associated with the device. It's giving full state wipe, not a tiny poke. 💅

The way it differs from __pci_reset_function_locked is that it saves and restores device state over the reset. And it also differs from pci_reset_function in that it requires the PCI device lock to be held. iykyk. 🔒

💅 CONTEXT 💅

The caller must hold the device lock. Like, that's not optional. Hold the lock, bestie. 🔒✨

🔥 RETURN 🔥

0 if the device function was successfully reset, or negative if the device doesn't support resetting a single function. That's the whole return vibe. Negative = no single-function reset support. 🫶

🌈 SEE ALSO 🌈

okay the SEE ALSO friend group is huge and every single one is invited. The kernel file is ./drivers/pci/pci.c, and then:

• Kernel file ./drivers/pci/pci.c, pci_bus_max_busnr(9)
• pci_status_get_and_clear_errors(9), pci_dev_str_match_path(9)
• pci_dev_str_match(9), pci_find_capability(9)
• pci_bus_find_capability(9), pci_find_next_ext_capability(9)
• pci_find_ext_capability(9), pci_get_dsn(9)
• pci_find_next_ht_capability(9), pci_find_ht_capability(9)
• pci_find_vsec_capability(9), pci_find_dvsec_capability(9)
• pci_find_parent_resource(9), pci_find_resource(9), pci_resource_name(9)
• pci_wait_for_pending(9), pci_request_acs(9), pci_std_enable_acs(9)
• pci_enable_acs(9), pci_restore_bars(9), pci_update_current_state(9)
• pci_refresh_power_state(9), pci_platform_power_transition(9)
• pci_resume_bus(9), pci_power_up(9), pci_set_full_power_state(9)
• __pci_dev_set_current_state(9), pci_bus_set_current_state(9)
• pci_set_low_power_state(9), pci_set_power_state(9), pci_save_state(9)
• pci_restore_state(9), pci_store_saved_state(9), pci_load_saved_state(9)
• pci_load_and_free_saved_state(9), pci_reenable_device(9)
• pci_enable_device_mem(9), pci_enable_device(9)
• pcibios_release_device(9), pcibios_disable_device(9)
• pci_disable_enabled_device(9), pci_disable_device(9)
• pcibios_set_pcie_reset_state(9), pci_set_pcie_reset_state(9)
• pcie_clear_root_pme_status(9), pci_check_pme_status(9)
• pci_pme_wakeup(9), pci_pme_wakeup_bus(9), pci_pme_capable(9)
• pci_pme_restore(9), pci_pme_active(9), __pci_enable_wake(9)
• pci_enable_wake(9), pci_wake_from_d3(9), pci_target_state(9)
• pci_prepare_to_sleep(9), pci_back_from_sleep(9)
• pci_finish_runtime_suspend(9), pci_dev_run_wake(9)
• pci_dev_need_resume(9), pci_dev_adjust_pme(9)
• pci_dev_complete_resume(9), pci_choose_state(9)
• pci_suspend_retains_context(9), pci_bridge_d3_possible(9)
• pci_d3cold_enable(9), pci_d3cold_disable(9), pci_pm_init(9)
• _pci_add_cap_save_buffer(9), pci_allocate_cap_save_buffers(9)
• pci_configure_ari(9), pci_acs_enabled(9), pci_acs_path_enabled(9)
• pci_acs_init(9), pci_enable_atomic_ops_to_root(9)
• pci_release_region(9), __pci_request_region(9), pci_request_region(9)
• pci_release_selected_regions(9), pci_request_selected_regions(9)
• pci_request_selected_regions_exclusive(9), pci_release_regions(9)
• pci_request_regions(9), pci_request_regions_exclusive(9)
• pci_remap_iospace(9), pci_unmap_iospace(9), pcibios_setup(9)
• pcibios_set_master(9), pci_set_master(9), pci_clear_master(9)
• pci_set_cacheline_size(9), pci_set_mwi(9), pci_try_set_mwi(9)
• pci_clear_mwi(9), pci_disable_parity(9), pci_intx(9)
• pci_wait_for_pending_transaction(9), pcie_flr(9), pcie_reset_flr(9)
• pci_pm_reset(9), pcie_wait_for_link_status(9), pcie_retrain_link(9)
• pcie_wait_for_link_delay(9), pcie_wait_for_link(9)
• pci_bridge_wait_for_secondary_bus(9), pci_bridge_secondary_bus_reset(9)
• __pci_reset_function_locked(9), pci_init_reset_methods(9)
• pci_reset_function(9), pci_try_reset_function(9)
• pci_probe_reset_slot(9), pci_try_reset_slot(9), pci_try_reset_bus(9)
• pci_reset_bridge(9), pci_bus_error_reset(9), pci_probe_reset_bus(9)
• pci_reset_bus(9), pcix_get_max_mmrbc(9), pcix_get_mmrbc(9)
• pcix_set_mmrbc(9), pcie_get_readrq(9), pcie_set_readrq(9)
• pcie_get_mps(9), pcie_set_mps(9), pcie_bandwidth_available(9)
• pcie_get_supported_speeds(9), pcie_get_speed_cap(9)
• pcie_get_width_cap(9), pcie_bandwidth_capable(9)
• __pcie_print_link_status(9), pcie_print_link_status(9)
• pci_select_bars(9), pci_set_vga_state(9), pci_add_dma_alias(9)
• pci_real_dma_dev(9), pci_specified_resource_alignment(9)
• pci_bus_find_emul_domain_nr(9), pci_ext_cfg_avail(9)

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mwah 💋 — source/version: ./drivers/pci; date: October 2026; and the page is pci_reset_function_locked(9). periodt. 🫶