dwc2_host_get_tt_info(9)

💅 dwc2_host_get_tt_info(9) — like, the Kernel API Manual, bestie ✨

okay so real quick — this page lives in the Kernel API Manual (that's the manual name, iykyk), and it's all about dwc2_host_get_tt_info. Let's get into it 🫶

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🌸 NAME 🌸

dwc2_host_get_tt_info — grab the dwc2_tt that's associated with a context ✨

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🎀 SYNOPSIS 🎀

struct dwc2_tt * dwc2_host_get_tt_info (struct dwc2_hsotg *hsotg , void
*context , gfp_t mem_flags , int *ttport );

like, that's the whole signature, no cap 💅

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🦋 ARGUMENTS 🦋

• hsotg — the HCD state structure for the DWC OTG controller. your main character struct fr 🫶
• context — the priv pointer from a struct dwc2_hcd_urb. yes bestie, that one.
• mem_flags — flags for allocating memory. the alloc vibes ✨
• ttport — we'll return this device's port number right here. that's used to reference into the bitmap if we're on a multi_tt hub 👑

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🌈 DESCRIPTION 🌈

so what this does is it gets the dwc2_tt structure (plus the ttport) that's associated with the given context — and the context is really just a struct urb pointer, lowkey 🫶

the first time this gets called for a given TT, we allocate memory for our structure. and then when everyone is done and has called dwc2_host_put_tt_info, the refcount for the structure goes to 0 and we free it. iconic cleanup behavior tbh 💅

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⭐ RETURN ⭐

returns a pointer to a struct dwc2_tt ✨

🚨 do NOT forget to call dwc2_host_put_tt_info! like actually, bestie, don't leave it hanging 😭

returns NULL upon memory alloc failure 💀

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💜 SEE ALSO 💜

kernel file ./drivers/usb/dwc2/hcd.c, plus this whole squad of friends 🫶:

• dwc2_enable_common_interrupts(9)
• dwc2_enable_host_interrupts(9)
• dwc2_disable_host_interrupts(9)
• dwc2_calc_frame_interval(9)
• dwc2_read_packet(9)
• dwc2_dump_channel_info(9)
• dwc2_hc_init(9)
• dwc2_hc_halt(9)
• dwc2_hc_cleanup(9)
• dwc2_hc_set_even_odd_frame(9)
• dwc2_hc_write_packet(9)
• dwc2_hc_do_ping(9)
• dwc2_hc_start_transfer(9)
• dwc2_hc_start_transfer_ddma(9)
• dwc2_hc_continue_transfer(9)
• dwc2_hcd_start(9)
• dwc2_hcd_connect(9)
• dwc2_hcd_disconnect(9)
• dwc2_hcd_rem_wakeup(9)
• dwc2_hcd_stop(9)
• dwc2_core_init(9)
• dwc2_core_host_init(9)
• dwc2_assign_and_init_hc(9)
• dwc2_hcd_select_transactions(9)
• dwc2_queue_transaction(9)
• dwc2_hcd_queue_transactions(9)
• dwc2_port_suspend(9)
• dwc2_port_resume(9)
• dwc2_host_put_tt_info(9)
• dwc2_backup_host_registers(9)
• dwc2_restore_host_registers(9)
• dwc2_host_enter_hibernation(9)
• dwc2_host_enter_partial_power_down(9)
• dwc2_host_enter_clock_gating(9)
• dwc2_host_exit_clock_gating(9)

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🧚 and that's the whole page, bestie! it's from ./drivers/usb/dwc2, dated October 2026, and yes it's literally titled dwc2_host_get_tt_info(9) 💖 periodt ✨