STRUCT VKMS_OUTPUT(9)

💜 struct vkms_output(9) — like, the whole vibe of VKMS output, bestie

okay so this is a page from the Kernel API Manual, and it's about struct vkms_output — which is literally the internal representation of all the output components in VKMS. everything that makes your virtual output a whole entire unit lives in here. main character energy tbh 👑

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✨ NAME ✨

struct vkms_output — the internal representation of all output components in VKMS 🎀

like, all of them. no cap.

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🌸 SYNOPSIS 🌸

here's the whole struct, copied exactly because we do not play with typos:

struct vkms_output {
    struct drm_crtc crtc;
    struct drm_writeback_connector wb_connector;
    struct drm_encoder wb_encoder;
    struct workqueue_struct *composer_workq;
    spinlock_t lock;
    bool composer_enabled;
    struct vkms_crtc_state *composer_state;
    spinlock_t composer_lock;
 };

that's it, that's the struct. eight members. iconic. 💅

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🦋 Members 🦋

okay let's go through every single one because every detail matters and we're not skipping anything:

• crtc — the base CRTC in DRM. that's her foundation, her roots, her origin story 💖
• wb_connector — a struct drm_writeback_connector. (it's chillin' in the struct up there, bestie 👀)
• wb_encoder — a struct drm_encoder. (also just vibing in the struct ✨)
• composer_workq — an ordered workqueue for composer_state.composer_work. ordered is the key word here — she queues things up in order, she's not chaotic 🔥
• lock — the lock used to protect concurrent access to the composer. basically the bouncer at the club door, nobody gets in while she's holding it 🫶
• composer_enabled — protected by lock, and it's true when the VKMS composer is active (like when a crc is needed, or writeback is happening). she's either on or off, no in-between 💀
• composer_state — protected by lock, this is the current state of this VKMS output. the now. the present. the moment 🌈
• composer_lock — a lock used internally to protect composer_state members. different lock, different job, don't mix them up okay 👑

ngl the lock / composer_lock situation is very "two locks, two purposes" and if you confuse them that's on you bestie 😭

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⭐ SEE ALSO ⭐

the kernel file ./drivers/gpu/drm/vkms/vkms_drv.h and honestly a whole friend group of related pages:

• struct vkms_frame_info(9)
• struct pixel_argb_u16(9)
• pixel_write_t(9)
• enum pixel_read_direction(9)
• pixel_read_line_t(9)
• struct conversion_matrix(9)
• struct vkms_plane_state(9)
• struct vkms_crtc_state(9)
• struct vkms_device(9)
• vkms_create(9)
• vkms_destroy(9)
• vkms_crtc_init(9)
• vkms_output_init(9)
• vkms_plane_init(9)

go read them. iykyk 💜

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that's the whole page bestie, you ate that 🍓 this little gem lives at ./drivers/gpu/drm/vkms, dated October 2026, and it's struct vkms_output(9) — mwah, slay, periodt 💅✨