get_resource(9)

💖 NAME 💖

okay so we're in the Kernel API Manual, bestie, and this page is get_resource(9) — it's literally the function that finds a resource of the size you asked for and splits up the bigger ones. 🎀

✨ SYNOPSIS ✨

struct pci_resource * get_resource (struct pci_resource **head , u32
size );

🎀 ARGUMENTS 🎀

• head — the list you're searching through for resources, bestie.
• size — the size limit to use. 📏

🦋 DESCRIPTION 🦋

okay so here's the tea: this function sorts the resource list by size, then returns the first node of "size" length. If it finds a node that's larger than "size", it will split it up. ✂️✨

🚨 bestie, "size" must be a power of two. Like, that's the rule. No cap. 💅

👑 SEE ALSO 👑

Kernel file ./drivers/pci/hotplug/cpqphp_ctrl.c is the main-character file for this one, and the whole friend group is:

• cpqhp_find_slot(9)
• sort_by_size(9)
• sort_by_max_size(9)
• do_pre_bridge_resource_split(9)
• do_bridge_resource_split(9)
• get_io_resource(9)
• get_max_resource(9)
• cpqhp_resource_sort_and_combine(9)
• cpqhp_slot_create(9)
• slot_remove(9)
• bridge_slot_remove(9)
• cpqhp_slot_find(9)
• set_controller_speed(9)
• board_replaced(9)
• board_added(9)
• remove_board(9)
• cpqhp_pushbutton_thread(9)
• switch_leds(9)
• cpqhp_hardware_test(9)
• configure_new_device(9)
• configure_new_function(9)

mwah 💋 — this page is sourced from ./drivers/pci/hotplug and dated October 2026, page get_resource(9). byeee bestie 🫶✨