pcix_set_mmrbc(9)

🌸 NAME 🌸

okay so welcome to pcix_set_mmrbc(9) from the Kernel API Manual 💖. This one is literally:

pcix_set_mmrbc — set PCI-X maximum memory read byte count.

✨ SYNOPSIS ✨

int pcix_set_mmrbc (struct pci_dev *dev , int mmrbc );

🎀 ARGUMENTS 🎀

• dev — PCI device to query. 👀
• mmrbc — maximum memory read count in bytes. valid values are literally 512, 1024, 2048, 4096.

💅 DESCRIPTION 💅

If possible, this sets the maximum memory read byte count. Some bridges have errata that prevent this, so it's giving “we'll try, but the bridge might say no” 😭. Don't act surprised if it doesn't happen.

🦋 SEE ALSO 🦋

Kernel file: ./drivers/pci/pci.c. The whole PCI extended family is linked up below — same order, no missing besties:

• 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_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), 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)

okay that's the whole page, bestie 🫶. Before you close the tab: this one comes from ./drivers/pci, dated October 2026, and it's literally the pcix_set_mmrbc(9) page. Mwah 💋✨