dma_sb_unmap_area(9)

💅 dma_sb_unmap_area(9) — the Kernel API Manual, bestie edition 🎀

okay so picture this: you're deep in the Kernel API Manual, section 9, and the star of the show is dma_sb_unmap_area — literally the function that unmaps an area of memory from a device dma region. yes queen, cleanup era. 🧹✨

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✨ NAME ✨

dma_sb_unmap_area — Unmap an area of memory from a device dma region.

like it does exactly what it says on the tin, no cap. 🫶

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🌸 SYNOPSIS 🌸

int dma_sb_unmap_area (struct ps3_dma_region *r , dma_addr_t bus_addr ,
unsigned long len );

look at her. returns an int, takes three lil arguments, absolute icon behavior. 👑

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🦋 ARGUMENTS 🦋

• r — Pointer to a struct ps3_dma_region. this is the region bestie, the whole vibe, the main character of the operation 💖
• bus_addr — The starting ioc bus address of the area to unmap. it's giving "where the unmapping begins" energy ✨
• len — Length in bytes of the area to unmap. how much are we unmapping? this many bytes, fr fr 📏

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🎀 DESCRIPTION 🎀

This is the common dma unmap routine.

that's it. that's the description. she's short, she's sweet, she's the standard go-to unmap routine and we respect her for it. 💅

ngl this one's a supporting character in the ps3 dma saga, but every main character needs a bestie, iykyk. 🫶

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🌈 SEE ALSO 🌈

okay so here's the whole friend group, and yes you should absolutely go read all of them:

• Kernel file ./arch/powerpc/platforms/ps3/mm.c
• struct mem_region(9)
• struct map(9)
• ps3_mm_phys_to_lpar(9)
• ps3_mm_vas_create(9)
• ps3_mm_vas_destroy(9)
• ps3_mm_region_create(9)
• ps3_mm_region_destroy(9)
• dma_sb_lpar_to_bus(9)
• dma_sb_map_pages(9)
• dma_sb_region_create(9)
• dma_sb_map_area(9)
• dma_sb_region_create_linear(9)
• dma_sb_region_free_linear(9)
• dma_sb_map_area_linear(9)
• ps3_mm_init(9)
• ps3_mm_shutdown(9)

like, the whole crew showed up. obsessed. 🌸

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and that's the page babes 💜 — brought to you by ./arch/powerpc/platforms/ps3, dated October 2026, in the 9 section of the Kernel API Manual. go unmap something responsibly, mwah 🎀✨🔥