vio_cmo_dealloc(9)

💅 vio_cmo_dealloc(9) 💅

okay bestie, welcome to the Kernel API Manual entry for vio_cmo_dealloc — yes, the (9) is right there, we’re in kernel API land. this function is literally about deallocating IO memory from CMO-enable devices, and the whole vibe is “give the memory back to the correct pools.” no cap. 🧚✨

🌸 NAME 🌸

vio_cmo_dealloc — deallocate IO memory from CMO-enable devices 💖

🎀 SYNOPSIS 🎀

void vio_cmo_dealloc (struct vio_dev *viodev , size_t size );

🦋 ARGUMENTS 🦋

• viodev — VIO device freeing IO memory 🫶
• size — size of deallocation, aka how much is being given back 💅

✨ DESCRIPTION ✨

IO memory is freed by the device back to the correct memory pools. and bestie, the order is the whole plot:

1. the spare pool is replenished first from either memory pool 🌈
2. then the reserve pool is used to reduce device entitlement 👑
3. the excess pool is used to increase the reserve pool toward the desired entitlement target 🔥
4. and then the remaining memory is returned to the pools. periodt. 💜

🌟 SEE ALSO 🌟

the kernel file is ./arch/powerpc/platforms/pseries/vio.c, and here’s the whole friend group:

• vio_cmo_alloc(9)
• vio_cmo_entitlement_update(9)
• vio_cmo_balance(9)
• vio_cmo_set_dev_desired(9)
• vio_cmo_bus_probe(9)
• vio_cmo_bus_remove(9)
• vio_cmo_bus_init(9)
• vio_h_cop_sync(9)
• vio_match_device(9)
• vio_unregister_driver(9)
• vio_register_device_node(9)
• vio_bus_init(9)
• vio_get_attribute(9)
• vio_find_node(9)

okay that’s the whole page, bestie! source/version says ./arch/powerpc/platforms/pseries, dated October 2026, and the page is vio_cmo_dealloc(9). byeee 👑💖