STRUCT TTM_RESOURCE(9)

🎀 struct ttm_resource(9) 🎀

okay so bestie, welcome to the Kernel API Manual ✨ this one is literally about struct ttm_resource and it's giving "small struct, big responsibilities" energy 💅

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🌸 NAME 🌸

struct ttm_resource —

and honestly? the manpage leaves the description blank after the dash. no cap, there's just... nothing there 🙈 so we move on, bestie, the good stuff is right below 🫶

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⭐ SYNOPSIS ⭐

struct ttm_resource {
    unsigned long start;
    size_t size;
    uint32_t mem_type;
    uint32_t placement;
    struct ttm_bus_placement bus;
    struct ttm_buffer_object *bo;
    struct dmem_cgroup_pool_state *css;
    struct ttm_lru_item lru;
 };

like, look at her. eight fields, zero notes, all business 🧚

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💖 Members 💖

okay so let's go field by field, main character by main character 👑

• start — where the allocation actually starts, bestie. that's it, that's the field 💫
• size — the actual size of the resource in bytes. factual. measured. not vibes 🌸
• mem_type — the resource type of the allocation. classic. iconic. it tells you what kind of thing this is 🔥
• placement — placement flags!! flags!! we love flags 🎀
• bus — the placement on the io bus that the CPU can actually reach. think of it as the "yes you can touch it" address situation 🦋
• bo — a weak reference to the BO, and it's protected by ttm_device::lru_lock. weak reference!! she does NOT own it, so do not go freeing things through her 😭 and yes, the lock protection is real, respect the lock 🔒
• css — the cgroup state that this resource is charged to. memory accounting, bestie, somebody's paying for this 💸
• lru — the least recently used list entry, see ttm_resource_manager.lru. LRU girlies rise up 💜

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🌈 Description 🌈

it's the structure that says where a buffer object lives and how much space it's using — the placement + the space resources, all wrapped up in one little struct 👑 literally the "who, what, and how much room" of a buffer object, periodt ✨

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🔥 SEE ALSO 🔥

kernel file ./include/drm/ttm/ttm_resource.h, plus this whole friend group right here:

• TTM_NUM_MOVE_FENCES(9)
• enum ttm_lru_item_type(9)
• struct ttm_lru_item(9)
• ttm_lru_item_init(9)
• struct ttm_resource_manager(9)
• struct ttm_bus_placement(9)
• ttm_lru_item_to_res(9)
• struct ttm_lru_bulk_move_pos(9)
• struct ttm_lru_bulk_move(9)
• struct ttm_resource_cursor(9)
• struct ttm_kmap_iter_iomap(9)
• struct ttm_kmap_iter_linear_io(9)
• ttm_resource_manager_set_used(9)
• ttm_resource_manager_used(9)
• ttm_resource_manager_cleanup(9)
• ttm_resource_manager_for_each_res(9)

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aaaand that's the whole page, bestie 🫶 mwah 💋 this one came at you from ./include/drm/ttm, dated October 2026 — go forth and manage your resources responsibly, ily 💖✨