xhci_sideba...point_buffer(9)

💅 xhci_sideba...point_buffer(9) 💅

Okay bestie, welcome to the xhci_sideba...point_buffer(9) page — no cap, this one's lowkey iconic for anyone doing sideband stuff with the xHC controller. Let's get into it. ✨

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🌸 NAME 🌸

xhci_sideband_get_endpoint_buffer — gets the endpoint transfer buffer address, periodt.

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✨ SYNOPSIS ✨

struct sg_table * xhci_sideband_get_endpoint_buffer (struct
xhci_sideband *sb , struct usb_host_endpoint *host_ep );

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🫶 ARGUMENTS 🫶

• sb — the sideband instance for this usb device, your main character for this call 🎀
• host_ep — the usb host endpoint, the whole reason we're here 🦋

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💅 DESCRIPTION 💅

So here's the vibe: this function returns the address of the endpoint buffer where the xHC controller reads queued transfer TRBs from. It's literally the starting address of the ringbuffer — the exact spot where the sideband client should be writing TRBs to. Slay. 🔥

⚠️ Bestie, listen — the caller needs to free the returned sg_table. Not optional, not a suggestion. Don't leave it hanging, okay? 😭

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💀 RETURN 💀

• struct sg_table * — if successful, you get the goods 💖
• NULL — otherwise, it's giving nothing, empty-handed, no buffer for you 🙈

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👑 SEE ALSO 👑

Kernel file ./drivers/usb/host/xhci-sideband.c — go read it, iykyk 📖

• xhci_sideband_notify_ep_ring_free(9)
• xhci_sideband_add_endpoint(9)
• xhci_sideband_remove_endpoint(9)
• xhci_sideband_get_event_buffer(9)
• xhci_sideband_check(9)
• xhci_sideband_create_interrupter(9)
• xhci_sideband_remove_interrupter(9)
• xhci_sideband_interrupter_id(9)
• xhci_sideband_register(9)
• xhci_sideband_unregister(9)

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Okay that's the whole page, bestie — you ate that. 💜 This gem lives under ./drivers/usb/host, straight outta the Kernel API Manual, dated October 2026. Go forth and buffer responsibly. 🌈✨🫶