pdc_build_txd(9)

✨ pdc_build_txd(9) ✨

from the Kernel API Manual — okay bestie, this is the page for building a DMA descriptor that sends a SPU request off to hardware. Let’s get into it 💅

🌸 NAME 🌸

okay so pdc_build_txd is literally the function that builds a DMA descriptor to transmit a SPU request to hardware. That’s the whole vibe. No cap.

🎀 SYNOPSIS 🎀

the exact signature is giving:

void pdc_build_txd (struct pdc_state *pdcs , dma_addr_t dma_addr , u32
buf_len , u32 flags );

💅 ARGUMENTS 💅

• pdcs — the PDC state for the SPU that’s gonna process this request 🫶
• dma_addr — the DMA address of the packet to be transmitted ✨
• buf_len — the length of the tx buffer, in bytes 🎀
• flags — the flags that get stored in the descriptor 🦋

🦋 SEE ALSO 🦋

Kernel file: ./drivers/mailbox/bcm-pdc-mailbox.c — go peek, bestie 👑

the rest of the crew is right here:

• pdc_setup_debugfs(9)
• pdc_build_rxd(9)
• pdc_receive_one(9)
• pdc_receive(9)
• pdc_tx_list_sg_add(9)
• pdc_tx_list_final(9)
• pdc_rx_list_init(9)
• pdc_rx_list_sg_add(9)
• pdc_irq_handler(9)
• pdc_work_cb(9)
• pdc_ring_init(9)
• pdc_desc_count(9)
• pdc_rings_full(9)
• pdc_last_tx_done(9)
• pdc_send_data(9)
• pdc_hw_init(9)
• pdc_hw_disable(9)
• pdc_rx_buf_pool_create(9)
• pdc_interrupts_init(9)
• pdc_mb_init(9)
• pdc_dt_read(9)
• pdc_probe(9)

mwah 💋 that’s the whole page — source/version is ./drivers/mailbox, dated October 2026, and that’s the cute little footer vibe, periodt 🫶