drm_vblank_count_and_time(9)

💖 drm_vblank_count_and_time(9) 💖

okay so bestie, welcome to the Kernel API Manual — yes, that's the manual name, we're in the kernel docs now and honestly? it's giving backstage pass energy 🎀

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✨ NAME ✨

drm_vblank_count_and_time — grab the "cooked" vblank counter value and the system timestamp that matches that counter value. two-for-one deal, we love to see it 🫶

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✨ SYNOPSIS ✨

u64 drm_vblank_count_and_time (struct drm_device *dev , unsigned int
pipe , ktime_t *vblanktime );

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✨ ARGUMENTS ✨

• dev — the DRM device. like, the whole main character of this operation 👑
• pipe — index of the CRTC whose counter you want. yes, that CRTC, you know the one 🌸
• vblanktime — pointer to a ktime_t that receives the vblank timestamp. it's the little mailbox where the answer gets dropped off 💌

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✨ DESCRIPTION ✨

So what this does is it fetches the "cooked" vblank count value — and bestie, that number represents how many vblank events have happened since the system was booted, including lost events due to modesetting activity 😭 (yes, the lost ones still count, they're not forgotten, they're cooked in 🔥).

It also returns the corresponding system timestamp — specifically the time of the vblank interval that matches the current vblank counter value ⭐

And a lil heads up: this is the legacy version of drm_crtc_vblank_count_and_time. legacy! iconic! but legacy 💅 iykyk

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✨ SEE ALSO ✨

• Kernel file ./drivers/gpu/drm/drm_vblank.c vblank handling(9)
• drm_crtc_accurate_vblank_count(9)
• drm_vblank_init(9)
• drm_dev_has_vblank(9)
• drm_crtc_vblank_waitqueue(9)
• drm_calc_timestamping_constants(9)
• drm_crtc_vblank_helper_get_vblank_timestamp_internal(9)
• drm_crtc_vblank_helper_get_vblank_timestamp(9)
• drm_crtc_get_last_vbltimestamp(9)
• drm_crtc_vblank_count(9)
• drm_crtc_vblank_count_and_time(9)
• drm_crtc_next_vblank_start(9)
• drm_crtc_arm_vblank_event(9)
• drm_crtc_send_vblank_event(9)
• drm_crtc_vblank_get(9)
• drm_crtc_vblank_put(9)
• drm_crtc_wait_one_vblank(9)
• drm_crtc_vblank_off(9)
• drm_crtc_vblank_reset(9)
• drm_crtc_set_max_vblank_count(9)
• drm_crtc_vblank_on_config(9)
• drm_crtc_vblank_on(9)
• drm_crtc_vblank_restore(9)
• drm_handle_vblank(9)
• drm_crtc_handle_vblank(9)
• drm_crtc_vblank_start_timer(9)
• drm_crtc_vblank_cancel_timer(9)
• drm_crtc_vblank_get_vblank_timeout(9)

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ngl that's a lot of siblings in the SEE ALSO list — every single one of them is here tho, no gatekeeping in this house 🦋

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aight that's the whole page, mwah 💋 this came from ./drivers/gpu/drm, dated October 2026 — go forth and count those vblanks, bestie, you're gonna slay 🌈✨💜