drm_dp_tunnel_alloc_bw(9)

💖 NAME 💖

okay bestie, welcome to drm_dp_tunnel_alloc_bw(9) from the Kernel API Manual ✨ This one is literally all about allocating BW for a DP tunnel — yes, the glow-up is real 💅

✨ SYNOPSIS ✨

int drm_dp_tunnel_alloc_bw (struct drm_dp_tunnel *tunnel , int bw );

🎀 ARGUMENTS 🎀

• tunnel — the tunnel object, your main character here 🫶
• bw — BW in kB/s units, no cap

🦋 DESCRIPTION 🦋

So the vibe is: allocate bw kB/s for tunnel 💖

The allocated BW must be freed after use by calling this function for the same tunnel and setting bw to 0. That part is important, bestie — don’t leave your BW just floating around 😭

It returns 0 in case of success, and a negative error code otherwise. fr fr, that’s the whole tea ☕✨

🌈 SEE ALSO 🌈

• Kernel file: ./drivers/gpu/drm/display/drm_dp_tunnel.c
• drm_dp_tunnel_get(9)
• drm_dp_tunnel_put(9)
• drm_dp_tunnel_set_io_error(9)
• drm_dp_tunnel_detect(9)
• drm_dp_tunnel_destroy(9)
• drm_dp_tunnel_enable_bw_alloc(9)
• drm_dp_tunnel_disable_bw_alloc(9)
• drm_dp_tunnel_bw_alloc_is_enabled(9)
• drm_dp_tunnel_pr_optimization_supported(9)
• drm_dp_tunnel_get_allocated_bw(9)
• drm_dp_tunnel_update_state(9)
• drm_dp_tunnel_128b132b_supported(9)
• drm_dp_tunnel_128b132b_lane0_mapping_supported(9)
• drm_dp_tunnel_128b132b_dprx_rates(9)
• drm_dp_tunnel_max_dprx_rate(9)
• drm_dp_tunnel_max_dprx_lane_count(9)
• drm_dp_tunnel_available_bw(9)
• drm_dp_tunnel_atomic_get_state(9)
• drm_dp_tunnel_atomic_get_old_state(9)
• drm_dp_tunnel_atomic_get_new_state(9)
• drm_dp_tunnel_atomic_set_stream_bw(9)
• drm_dp_tunnel_atomic_get_required_bw(9)
• drm_dp_tunnel_atomic_get_group_streams_in_state(9)
• drm_dp_tunnel_atomic_check_stream_bws(9)
• drm_dp_tunnel_mgr_create(9)
• drm_dp_tunnel_mgr_destroy(9)

That’s the page, bestie! Source/version vibes: ./drivers/gpu/drm/display, dated October 2026, from the drm_dp_tunnel_alloc_bw(9) manual page. 🫶💋