pdc_desc_count(9)

🎀 NAME 🎀

okay so bestie, welcome to the Kernel API Manual — this page is pdc_desc_count(9), and it is literally here to count the number of DMA descriptors that will be required for a given scatterlist. It also accounts for the max length of a DMA buffer. that's the whole vibe. 💖

✨ SYNOPSIS ✨

u32 pdc_desc_count (struct scatterlist *sg );

💅 ARGUMENTS 💅

• sg — the scatterlist to be DMA'd. that's the one you're handing over, bestie 🫶

🦋 RETURN 🦋

The number of descriptors required. it's giving “count and go,” no cap ✨

🌈 SEE ALSO 🌈

Kernel file ./drivers/mailbox/bcm-pdc-mailbox.c — that's where the lore lives 👑

• pdc_setup_debugfs(9)
• pdc_build_rxd(9)
• pdc_build_txd(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_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 💋 — sourced from ./drivers/mailbox, dated October 2026, and this is pdc_desc_count(9) signing off. periodt 👑