amdgpu_wb_get(9)

💅 amdgpu_wb_get(9) — the Kernel API Manual, bestie edition 🎀

okay so real talk, this is a page from the Linux kernel API manual, section 9 (that's the kernel internals girlies 💜). The function we're obsessing over today is amdgpu_wb_get, and yes she's giving main character energy in ./drivers/gpu/drm/amd/amdgpu. Let's get into it ✨

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🌸 NAME 🌸

amdgpu_wb_get — literally just "Allocate a wb entry" 💫 that's the whole vibe, no cap

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✨ SYNOPSIS ✨

int amdgpu_wb_get (struct amdgpu_device *adev , u32 *wb );

so she takes two things and gives you back an int, periodt 🫶

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🎀 ARGUMENTS 🎀

• adev — an amdgpu_device pointer, i.e. your whole GPU device situation, the main character herself 👑
• wb — the wb index, which is exactly what it sounds like (a wb index, bestie, I don't make the rules) 🦋

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🔥 DESCRIPTION 🔥

So what she does: amdgpu_wb_get allocates a wb slot for use by the driver — and yes, that's for all asics 💀 every single one, no exceptions, we love an inclusive queen.

Then the return value, and this part matters so pay attention 🙈:

• Returns 0 on success 🎉
• Returns -EINVAL on failure 😭

not -EINVAL bestie... but fr fr that's the failure signal, so check your return value, always, no exceptions 💅

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🌈 SEE ALSO 🌈

go look at the kernel file ./drivers/gpu/drm/amd/amdgpu/amdgpu_wb.c — that's where the lore lives 📖 and while you're there, the whole friend group:

• amdgpu_wb_fini(9)
• amdgpu_wb_init(9)
• amdgpu_wb_free(9)

like it's a whole squad, get to know all of them 🫶✨

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and that's the page 🎀 this lil love letter came out of ./drivers/gpu/drm/amd/amdgpu, dated October 2026, for amdgpu_wb_get(9) — go forth and allocate responsibly, bestie, mwah 💖💅