alloc_dma_buffer(9)

💖 alloc_dma_buffer(9) — Kernel API Manual 💖

okay so bestie, welcome to the Kernel API Manual page for alloc_dma_buffer(9). It’s giving kernel DMA, it’s giving tiny-but-iconic, and we’re keeping every single detail. ✨

🌸 NAME 🌸

alloc_dma_buffer - Create DMA Buffer

✨ SYNOPSIS ✨

void * alloc_dma_buffer (struct vio_dev *vdev , size_t size , dma_addr_t *dma_handle );

That’s the signature exactly, no cap. 💅

🎀 ARGUMENTS 🎀

• vdev — vio_dev struct. That’s it; that’s the whole assignment. 🍓
• size — Size field. Literally the size field, bestie. 🎀
• dma_handle — DMA address field. Yep, the DMA address field, periodt. 💜

🦋 DESCRIPTION 🦋

okay so the actual tea: alloc_dma_buffer allocates memory for the command queue and maps remote memory into an ioba. That’s the whole flex. 🔥

It returns a pointer to the buffer. Main character return value energy, no notes. 👑

💜 SEE ALSO 💜

Kernel file ./drivers/misc/ibmvmc.c — and the whole extended group chat is:

• h_request_vmc(9)
• ibmvmc_handle_event(9)
• ibmvmc_release_crq_queue(9)
• ibmvmc_reset_crq_queue(9)
• crq_queue_next_crq(9)
• ibmvmc_send_crq(9)
• free_dma_buffer(9)
• ibmvmc_get_valid_hmc_buffer(9)
• ibmvmc_get_free_hmc_buffer(9)
• ibmvmc_free_hmc_buffer(9)
• ibmvmc_count_hmc_buffers(9)
• ibmvmc_get_free_hmc(9)
• ibmvmc_return_hmc(9)
• ibmvmc_send_open(9)
• ibmvmc_send_close(9)
• ibmvmc_send_capabilities(9)
• ibmvmc_send_add_buffer_resp(9)
• ibmvmc_send_rem_buffer_resp(9)
• ibmvmc_send_msg(9)
• ibmvmc_open(9)
• ibmvmc_close(9)
• ibmvmc_read(9)
• ibmvmc_poll(9)
• ibmvmc_write(9)
• ibmvmc_setup_hmc(9)
• ibmvmc_ioctl_sethmcid(9)
• ibmvmc_ioctl_query(9)
• ibmvmc_ioctl_requestvmc(9)
• ibmvmc_ioctl(9)
• ibmvmc_add_buffer(9)
• ibmvmc_rem_buffer(9)
• ibmvmc_process_capabilities(9)
• ibmvmc_validate_hmc_session(9)
• ibmvmc_reset(9)
• ibmvmc_reset_task(9)
• ibmvmc_process_open_resp(9)
• ibmvmc_process_close_resp(9)
• ibmvmc_crq_process(9)
• ibmvmc_handle_crq_init(9)
• ibmvmc_handle_crq(9)
• ibmvmc_init_crq_queue(9)

💌 Cute sign-off: this page comes from the Kernel API Manual, source ./drivers/misc, dated October 2026. Bye bestie — go slay! 🫶💅