rio_request_mport_dma(9)

💅 rio_request_mport_dma(9) 💅

okay bestie, welcome to the Kernel API Manual — yes, the Kernel API Manual, the one you keep hearing about at parties. this page is literally about rio_request_mport_dma, and it's short, it's sweet, and it's gonna slay. let's go 🎀

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✨ NAME ✨

rio_request_mport_dma — request a RapidIO capable DMA channel that's associated with the specified local RapidIO mport device. that's it, that's the whole vibe 🦋

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✨ SYNOPSIS ✨

struct dma_chan * rio_request_mport_dma (struct rio_mport *mport );

like, look at that signature. no cap, it's giving main character energy 👑

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✨ ARGUMENTS ✨

• mport — the RIO mport that's gonna perform the DMA data transfers. this is the port, the one doing the heavy lifting, the moment 💪

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✨ DESCRIPTION ✨

so here's the tea: it returns a pointer to the allocated DMA channel. or NULL if it failed. like, if it didn't work out, you get NULL. that's the entire plot twist 😭

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✨ SEE ALSO ✨

okay so this is the part where the whole friend group shows up. brace yourself, bestie, there are so many of them and they're all iconic in their own way 💜

and yes, they all live in the kernel file ./drivers/rapidio/rio.c — that's the group chat, iykyk 🫶

• rio_local_get_device_id(9)
• rio_query_mport(9)
• rio_alloc_net(9)
• rio_local_set_device_id(9)
• rio_add_device(9)
• rio_request_inb_mbox(9)
• rio_release_inb_mbox(9)
• rio_request_outb_mbox(9)
• rio_release_outb_mbox(9)
• rio_setup_inb_dbell(9)
• rio_request_inb_dbell(9)
• rio_release_inb_dbell(9)
• rio_request_outb_dbell(9)
• rio_release_outb_dbell(9)
• rio_add_mport_pw_handler(9)
• rio_del_mport_pw_handler(9)
• rio_request_inb_pwrite(9)
• rio_release_inb_pwrite(9)
• rio_pw_enable(9)
• rio_map_inb_region(9)
• rio_unmap_inb_region(9)
• rio_map_outb_region(9)
• rio_unmap_outb_region(9)
• rio_mport_get_physefb(9)
• rio_get_comptag(9)
• rio_set_port_lockout(9)
• rio_enable_rx_tx_port(9)
• rio_chk_dev_route(9)
• rio_mport_chk_dev_access(9)
• rio_chk_dev_access(9)
• rio_get_input_status(9)
• rio_clr_err_stopped(9)
• rio_inb_pwrite_handler(9)
• rio_mport_get_efb(9)
• rio_mport_get_feature(9)
• rio_std_route_add_entry(9)
• rio_std_route_get_entry(9)
• rio_std_route_clr_table(9)
• rio_lock_device(9)
• rio_unlock_device(9)
• rio_route_add_entry(9)
• rio_route_get_entry(9)
• rio_route_clr_table(9)
• rio_release_dma(9)
• rio_dma_prep_xfer(9)
• rio_register_scan(9)
• rio_mport_scan(9)

like… that's the whole roster. every single one. no skips, no cuts, we don't do that here 💅✨

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pro tip from your girl: this page lives under ./drivers/rapidio, dated October 2026, and it's rio_request_mport_dma(9) forever and always. mwah 🍓

stay hydrated, read your manpages, and remember: NULL is a valid answer bestie 🌈⭐🧚