tsi721_maint_dma(9)

💅 tsi721_maint_dma(9) — Kernel API Manual 💅

okay so bestie, welcome to the tsi721_maint_dma(9) page — it lives in the Kernel API Manual and it's literally the little helper that gets your RapidIO maintenance transactions out the door. no cap, it's giving "small function, big job" energy. 🎀

✨ NAME ✨

tsi721_maint_dma — the helper function that generates RapidIO maintenance transactions using a designated Tsi721 DMA channel. 🦋

🌸 SYNOPSIS 🌸

int tsi721_maint_dma (struct tsi721_device *priv , u32 sys_size , u16
destid , u8 hopcount , u32 offset , int len , u32 *data , int do_wr );

💖 ARGUMENTS 💖

like, every single one of these matters, so pay attention bestie:

• priv — pointer to the tsi721 private data. your whole vibe lives here. ✨
• sys_size — the RapdiIO transport system size.
• destid — the Destination ID of the transaction. who are we talking to 👀
• hopcount — the number of hops to the target device. it's a journey, not a sprint 🚶‍♀️
• offset — the offset into configuration space.
• len — the length (in bytes) of the maintenance transaction. keep it exact, no vibes-based measuring 📏
• data — the location to be read from or written into.
• do_wr — the operation flag, where 1 == MAINT_WR. so 1 means write, and that's the whole mood 💅

🔥 DESCRIPTION 🔥

It generates a RapidIO maintenance transaction — Read or Write. That's it, that's the function. iconic behaviour, honestly. 👑

⭐ RETURN ⭐

0 on success, and -EINVAL or -EFAULT on failure. so like, always check your return value, bestie — it's not decorative 😭

🌈 SEE ALSO 🌈

Kernel file ./drivers/rapidio/devices/tsi721.c — plus the whole squad, fr fr:

• tsi721_lcread(9)
• tsi721_lcwrite(9)
• tsi721_cread_dma(9)
• tsi721_cwrite_dma(9)
• tsi721_pw_handler(9)
• tsi721_pw_enable(9)
• tsi721_dsend(9)
• tsi721_dbell_handler(9)
• tsi721_irqhandler(9)
• tsi721_omsg_msix(9)
• tsi721_imsg_msix(9)
• tsi721_srio_msix(9)
• tsi721_sr2pc_ch_msix(9)
• tsi721_request_msix(9)
• tsi721_enable_msix(9)
• tsi721_init_pc2sr_mapping(9)
• tsi721_rio_map_inb_mem(9)
• tsi721_rio_unmap_inb_mem(9)
• tsi721_init_sr2pc_mapping(9)
• tsi721_port_write_init(9)
• tsi721_bdma_maint_init(9)
• tsi721_add_outb_message(9)
• tsi721_omsg_handler(9)
• tsi721_open_outb_mbox(9)
• tsi721_close_outb_mbox(9)
• tsi721_imsg_handler(9)
• tsi721_open_inb_mbox(9)
• tsi721_close_inb_mbox(9)
• tsi721_add_inb_buffer(9)
• tsi721_get_inb_message(9)
• tsi721_messages_init(9)
• tsi721_query_mport(9)
• tsi721_disable_ints(9)
• tsi721_setup_mport(9)

and that's the whole page, bestie 🫶 this one's chilling in ./drivers/rapidio/devices, dated October 2026, and it's still out here signing off as tsi721_maint_dma(9) like the main character it is 💜✨