vmw_cmdbuf_reserve(9)

📦 version 7.3.1, in nixpkgs unstable

💅 vmw_cmdbuf_reserve — kernel API manual, bestie edition 🎀

Okay so picture this: you're deep in the vmwgfx driver, section 9 of the kernel API manual, and you need a little room in a command buffer for your commands. That's literally what vmw_cmdbuf_reserve is for. It reserves space for commands in a command buffer. Slay. ✨

🌸 SYNOPSIS 🌸

void * vmw_cmdbuf_reserve (struct vmw_cmdbuf_man *man , size_t size ,
int ctx_id , bool interruptible , struct vmw_cmdbuf_header *header );

No cap, that's the whole signature. Let's break down every single arg, because every detail matters. 💖

🦋 ARGUMENTS 🦋

  • man — the command buffer manager. The main character of this whole operation, fr fr. 👑
  • size — how big you want your commands to be. The requested size of the commands, periodt.
  • ctx_id — the context id, if there even is one. If there isn't? Set it to SVGA3D_REG_INVALID. Don't forget, bestie. 🙈
  • interruptible — a bool that says whether to sleep interruptible while waiting for space. Yes, that's a whole mood. 😴
  • header — header of the command buffer. Pass NULL if the current command buffer should be used instead. Simple as that. 🫶

✨ DESCRIPTION ✨

So what does it actually do? It returns a pointer to command buffer space if successful — that's the win. 🎉

Otherwise? It returns an error pointer. Not the vibe, but that's the deal. 💀

💜 SEE ALSO 💜

The kernel file ./drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c, plus this whole friend group of structs and functions — every single one, no skipping, iykyk:

Lowkey, all of these live under ./drivers/gpu/drm/vmwgfx, so if you're lost, that's your home base. 🏡

And that's the whole page, bestie — sourced from ./drivers/gpu/drm/vmwgfx, dated October 2026. Go reserve that space, you absolute icon. 💅🌈⭐

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