ttm_io_prot(9)

💅 ttm_io_prot(9) — a Kernel API Manual moment

okay so bestie, welcome to the Kernel API Manual entry for ttm_io_prot(9) — yes the header says the manual name right there, we love a formal intro ✨

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🌸 NAME 🌸

ttm_io_prot — and honestly? that's it. the NAME section literally gives us the function name and then… nothing. no description. no tagline. she said "my name is enough" and honestly, iconic. main character energy fr 💅

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✨ SYNOPSIS ✨

pgprot_t ttm_io_prot (struct ttm_buffer_object *bo , struct ttm_resource
*res , pgprot_t tmp );

so she returns a pgprot_t, and she takes three things. noted. copied exactly. no cap 🫶

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🎀 ARGUMENTS 🎀

• bo — the ttm buffer object 💖 like, the buffer, the whole point
• res — the ttm resource object 🌸 the resource half of the situation
• tmp — Page protection flag for a normal, cached mapping. yes bestie, normal, cached, we're talking the default vibe here ⭐

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🦋 DESCRIPTION 🦋

okay so here's the tea: ttm_io_prot is a utility function — a little helper, a supporting character with main character energy — that returns the pgprot_t you should be using when you're setting up a PTE 👑

and which pgprot_t? the one matching the caching model indicated by c_state. that's the whole bit. that's the function. she checks the caching model and hands you back the right protection bits 🔥

no more, no less. lowkey elegant. highkey useful 💜

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🌈 SEE ALSO 🌈

bestie there are SO many siblings, buckle up 🧚 it's giving family reunion:

• Kernel file ./drivers/gpu/drm/ttm/ttm_bo_util.c
• ttm_move_memcpy(9)
• ttm_bo_move_memcpy(9)
• ttm_buffer_object_transfer(9)
• ttm_bo_kmap_try_from_panic(9)
• ttm_bo_kmap(9)
• ttm_bo_kunmap(9)
• ttm_bo_vmap(9)
• ttm_bo_vunmap(9)
• ttm_bo_move_accel_cleanup(9)
• ttm_bo_move_sync_cleanup(9)
• ttm_bo_pipeline_gutting(9)
• ttm_lru_walk_for_evict(9)
• ttm_bo_lru_cursor_fini(9)
• ttm_bo_lru_cursor_init(9)
• ttm_bo_lru_cursor_next(9)
• ttm_bo_lru_cursor_first(9)
• ttm_bo_shrink(9)
• ttm_bo_shrink_suitable(9)
• ttm_bo_shrink_avoid_wait(9)

that's twenty-one references and i listed every single one, because we do NOT skip the boring parts in this house 😤💖

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ok tiny heads-up bestie: the DESCRIPTION talks about a thing called c_state, but c_state isn't in the argument list. that's just how the page is written — i'm not out here inventing lore 🙈 i report, you decide 💀

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and that's the whole page!! cute lil sign-off time: this one lives under ./drivers/gpu/drm/ttm, dated October 2026, and she's ttm_io_prot(9) from the Kernel API Manual. slay, periodt, go read a buffer object 🎀🦋💜