hl_hw_block_mmap(9)

💅 hl_hw_block_mmap(9) 💅

okay so this is a page from the Kernel API Manual, and bestie, we're talking about hl_hw_block_mmap — the little function that mmaps a hw block to user. let's get into it ✨

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✨ SYNOPSIS ✨

int hl_hw_block_mmap (struct hl_fpriv *hpriv , struct vm_area_struct
*vma );

like, that's the whole signature. she's compact, she's iconic, she returns an int. periodt 💅

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🎀 ARGUMENTS 🎀

• hpriv — pointer to the private data of the fd. yep, the file-descriptor tea 🫖
• vma — pointer to vm_area_struct of the process. that's the process's own lil memory-mapping struct, no cap 💖

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🌸 DESCRIPTION 🌸

so here's the vibe: the driver increments the context reference for every HW block mapped, and the whole reason is to prevent the user from closing the FD without unmapping first. like, you can't just dip out and leave your mappings hanging, that's not main character energy 😭🔒

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🦋 SEE ALSO 🦋

Kernel file ./drivers/accel/habanalabs/common/memory.c — go read her, she's the source of truth 💜

and then the whole friend group, fr fr:

• dma_map_host_va(9)
• dma_unmap_host_va(9)
• dram_pg_pool_do_release(9)
• free_phys_pg_pack(9)
• free_device_memory(9)
• clear_va_list_locked(9)
• print_va_list_locked(9)
• merge_va_blocks_locked(9)
• add_va_block_locked(9)
• add_va_block(9)
• is_hint_crossing_range(9)
• get_va_block(9)
• hl_get_va_range_type(9)
• hl_unreserve_va_block(9)
• init_phys_pg_pack_from_userptr(9)
• map_phys_pg_pack(9)
• unmap_phys_pg_pack(9)
• map_device_va(9)
• unmap_device_va(9)
• export_dmabuf_from_addr(9)
• allocate_timestamps_buffers(9)
• hl_pin_host_memory(9)
• hl_userptr_delete_list(9)
• hl_userptr_is_pinned(9)
• va_range_init(9)
• va_range_fini(9)
• vm_ctx_init_with_ranges(9)
• hl_vm_ctx_fini(9)
• hl_vm_init(9)
• hl_vm_fini(9)
• hl_hw_block_mem_init(9)
• hl_hw_block_mem_fini(9)

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okay that's the whole page, bestie, you ate that 🍓💅

and for the cute sign-off: this lil beauty lives over in ./drivers/accel/habanalabs/common, and she's dated October 2026. so she's fresh, she's future, she's giving timeless kernel realness 🌈👑✨