msgdma_prep_slave_sg(9)

💅 msgdma_prep_slave_sg(9) 💅

okay bestie, welcome to the Kernel API Manual — this is the msgdma_prep_slave_sg(9) page, and she is here to prep descriptors for a slave sg transaction. iconic.

✨ NAME ✨

msgdma_prep_slave_sg — prepare descriptors for a slave sg transaction. that's the whole assignment, and she ate.

🎀 SYNOPSIS 🎀

struct dma_async_tx_descriptor * msgdma_prep_slave_sg (struct dma_chan
*dchan , struct scatterlist *sgl , unsigned int sg_len , enum
dma_transfer_direction dir , unsigned long flags , void *context );

🦋 ARGUMENTS 🦋

• dchan — DMA channel. the channel in question, the main character of this call.
• sgl — Destination scatter list. literally the destination scatter list, no cap.
• sg_len — Number of entries in destination scatter list. count those entries, bestie.
• dir — DMA transfer direction. which way the transfer is going.
• flags — transfer ack flags. yes, ack flags — not the vibe of being acknowledged, the transfer kind.
• context — transfer context (unused). she's marked unused, so don't come for her.

🌈 SEE ALSO 🌈

the Kernel file ./drivers/dma/altera-msgdma.c is the backstage pass, and these are the besties in the same orbit:

• struct msgdma_extended_desc(9)
• struct msgdma_sw_desc(9)
• msgdma_get_descriptor(9)
• msgdma_free_descriptor(9)
• msgdma_free_desc_list(9)
• msgdma_desc_config(9)
• msgdma_desc_config_eod(9)
• msgdma_tx_submit(9)
• msgdma_prep_memcpy(9)
• msgdma_copy_desc_to_fifo(9)
• msgdma_start_transfer(9)
• msgdma_issue_pending(9)
• msgdma_chan_desc_cleanup(9)
• msgdma_complete_descriptor(9)
• msgdma_free_descriptors(9)
• msgdma_free_chan_resources(9)
• msgdma_alloc_chan_resources(9)
• msgdma_tasklet(9)
• msgdma_irq_handler(9)
• msgdma_dev_remove(9)
• msgdma_probe(9)
• msgdma_remove(9)

mwah 💋 this page is from ./drivers/dma, dated October 2026, and it's the msgdma_prep_slave_sg(9) manual entry. slay, bye 💖