tb_switch_alloc_dp_resource(9)

💅 tb_switch_alloc_dp_resource 💅

okay so this is a page from the Kernel API Manual (section 9, the kernel-functions girlies) and it's all about tb_switch_alloc_dp_resource — say that five times fast, i literally cannot 😭

---

✨ NAME ✨

tb_switch_alloc_dp_resource — bestie, this literally allocates an available DP resource 💖

---

🌈 SYNOPSIS 🌈

int tb_switch_alloc_dp_resource (struct tb_switch *sw , struct tb_port
*in );

like… that's it. that's the whole vibe check. two args, one int coming back at you 🫶

---

🎀 ARGUMENTS 🎀

• sw — the switch whose DP resource is getting allocated, like it's the main character in this whole operation 👑
• in — the DP IN port. the IN port. the one that goes in. iykyk 💅

---

🦋 DESCRIPTION 🦋

so here's the tea: this function allocates a DP resource for DP tunneling ✨

but like — key detail, no cap — the resource must already be available for this to actually succeed. so if you're rolling up in here hoping it'll magically sort itself out? it won't, bestie 💀 go check first with tb_switch_query_dp_resource, that's literally what it's for. vibe check your resources before you commit, periodt.

---

🔥 RETURN 🔥

• 0 — success, we ate, everything slays 🌸
• negative errno — literally anything else. something went wrong, not in a cute way 😭

---

⭐ SEE ALSO ⭐

omg this list is a moment. it's giving "the whole extended friend group showed up to the party." the source file is ./drivers/thunderbolt/switch.c and here's literally every single one of them, in order, no skips, no shortcuts 💜

• tb_switch_nvm_read(9)
• tb_port_state(9)
• tb_wait_for_port(9)
• tb_port_add_nfc_credits(9)
• tb_port_clear_counter(9)
• tb_port_unlock(9)
• tb_port_enable(9)
• tb_port_disable(9)
• tb_port_reset(9)
• tb_port_alloc_in_hopid(9)
• tb_port_alloc_out_hopid(9)
• tb_port_release_in_hopid(9)
• tb_port_release_out_hopid(9)
• tb_next_port_on_path(9)
• tb_port_get_link_speed(9)
• tb_port_get_link_generation(9)
• tb_port_get_link_width(9)
• tb_port_width_supported(9)
• tb_port_set_link_width(9)
• tb_port_set_lane_bonding(9)
• tb_port_lane_bonding_enable(9)
• tb_port_lane_bonding_disable(9)
• tb_port_wait_for_link_width(9)
• tb_port_update_credits(9)
• tb_port_is_enabled(9)
• tb_usb3_port_is_enabled(9)
• tb_usb3_port_enable(9)
• tb_pci_port_is_enabled(9)
• tb_pci_port_enable(9)
• tb_dp_port_hpd_is_active(9)
• tb_dp_port_hpd_clear(9)
• tb_dp_port_set_hops(9)
• tb_dp_port_is_enabled(9)
• tb_dp_port_enable(9)
• tb_switch_reset(9)
• tb_switch_wait_for_bit(9)
• tb_switch_alloc(9)
• tb_switch_alloc_safe_mode(9)
• tb_switch_configure(9)
• tb_switch_configuration_valid(9)
• tb_switch_lane_bonding_enable(9)
• tb_switch_lane_bonding_disable(9)
• tb_switch_set_link_width(9)
• tb_switch_configure_link(9)
• tb_switch_unconfigure_link(9)
• tb_switch_add(9)
• tb_switch_remove(9)
• tb_sw_set_unplugged(9)
• tb_switch_resume(9)
• tb_switch_suspend(9)
• tb_switch_query_dp_resource(9)
• tb_switch_dealloc_dp_resource(9)
• tb_switch_find_by_link_depth(9)
• tb_switch_find_by_uuid(9)
• tb_switch_find_by_route(9)
• tb_switch_find_port(9)
• tb_switch_pcie_l1_enable(9)
• tb_switch_xhci_connect(9)
• tb_switch_xhci_disconnect(9)

like i said. the whole group chat. 🧚✨

---

💀 real talk though: if the DP resource isn't available, this call does not succeed. that's not a bug, that's just the rules, bestie. check availability first, tb_switch_query_dp_resource is right there in the list, be responsible 🙈

---

okay that's the page!! mwah 💖

so yeah, this icon of a manual page lives in ./drivers/thunderbolt, and it was dated October 2026, title still tb_switch_alloc_dp_resource(9) because we don't change the main character's name. slay, bye 🦋🎀