pci_platfor...r_transition(9)

okay so bestie, welcome to pci_platfor...r_transition(9) from the Kernel API Manual — yes the name is literally giving truncated-with-dots realness, and no I did not do that, that's just the title 💅. This one is all about letting the platform handle a PCI device's power-state glow-up. Let's get into it 🫶.

💖 NAME 💖

pci_platform_power_transition — use the platform to change the device power state. That's the whole vibe: platform does the power move, device gets transitioned. ✨

✨ SYNOPSIS ✨

int pci_platform_power_transition (struct pci_dev *dev , pci_power_t
state );

🫶 ARGUMENTS 🫶

• dev — the PCI device to handle. like, this is the device getting the attention 🎀.
• state — the state to put the device into. that's the destination, the final form, the power-state era 🔥.

👑 SEE ALSO 👑

the kernel file is literally ./drivers/pci/pci.c, and then the whole PCI bestie group chat shows up for roll call — every single one, no cap:

• 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_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_reset_function_locked(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)

and that's the whole page, bestie 💋 — this lil one lives in ./drivers/pci, it's dated October 2026, and the manual title is still pci_platfor...r_transition(9) in case you need to find it again. mwah 🎀🌸