STRUCT DRM_TEGRA_CMDBUF(9)

💅 struct drm_tegra_cmdbuf(9)

okay bestie, so this is a page from the Kernel API Manual — yes, the real one, struct drm_tegra_cmdbuf(9) — and it's literally just the little struct that describes a command buffer. tiny struct, huge main character energy. let's get into it 🎀

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✨ NAME ✨

struct drm_tegra_cmdbuf — the structure that describes a command buffer. that's it, that's the whole vibe check ✨

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🌸 SYNOPSIS 🌸

here's the whole thing, copied exactly because we do not mess with code, periodt:

struct drm_tegra_cmdbuf {
    __u32 handle;
    __u32 offset;
    __u32 words;
    __u32 pad;
 };

four __u32 fields. no more, no less. she's compact and she knows it 💅

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🦋 MEMBERS 🦋

• handle — the handle to a GEM object, and that GEM object is the one holding the command buffer. like the little name tag that gets you into the party 🎀
• offset — the offset, in bytes, into the GEM object identified by handle where this command buffer actually starts. so you're not starting at the beginning, you're starting somewhere in there. count in bytes, bestie, bytes 🫶
• words — how many 32-bit words are in this command buffer. note: words, not bytes. do not come for me in the replies about units 😭
• pad — structure padding that may be used in the future. must be 0. no cap, must be zero. it's a little parking spot reserved for Future Them, and Future Them is not here yet 🙈

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💜 SEE ALSO 💜

the kernel file to go look at is ./include/uapi/drm/tegra_drm.h — that's the struct's home address 🏠

and here's the whole friend group, everyone tagged, nobody left out (yes, all of them, i would never):

• struct drm_tegra_gem_create(9)
• struct drm_tegra_gem_mmap(9)
• struct drm_tegra_syncpt_read(9)
• struct drm_tegra_syncpt_incr(9)
• struct drm_tegra_syncpt_wait(9)
• struct drm_tegra_open_channel(9)
• struct drm_tegra_close_channel(9)
• struct drm_tegra_get_syncpt(9)
• struct drm_tegra_get_syncpt_base(9)
• struct drm_tegra_syncpt(9)
• struct drm_tegra_reloc(9)
• struct drm_tegra_waitchk(9)
• struct drm_tegra_submit(9)
• struct drm_tegra_gem_set_tiling(9)
• struct drm_tegra_gem_get_tiling(9)
• struct drm_tegra_gem_set_flags(9)
• struct drm_tegra_gem_get_flags(9)
• DRM_TEGRA_SUBMIT_RELOC_SECTOR_LAYOUT(9)
• DRM_TEGRA_SUBMIT_CMD_GATHER_UPTR(9)
• DRM_TEGRA_SUBMIT_CMD_WAIT_SYNCPT(9)
• DRM_TEGRA_SUBMIT_CMD_WAIT_SYNCPT_RELATIVE(9)

like genuinely an iconic lineup, iykyk 👑

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🫶 reminder before you go: pad must be 0. that is not a suggestion, that is the rule. must be zero. love u, go build something 💖

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⭐ so that's the page!! source location is ./include/uapi/drm, it's dated October 2026, and the whole thing is filed under struct drm_tegra_cmdbuf(9) in the Kernel API Manual. mwah, bye bestie 💋🌈