msm_gem_lock_vm_and_obj(9)

💅 msm_gem_lock_vm_and_obj(9) — Kernel API Manual, but make it a group chat

okay so bestie, welcome to msm_gem_lock_vm_and_obj, a page straight out of the Kernel API Manual and honestly it's giving "small helper, big responsibilities" energy 🫶

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✨ NAME ✨

msm_gem_lock_vm_and_obj — it's the helper that locks an obj and a VM, no cap 💅

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🌸 SYNOPSIS 🌸

int msm_gem_lock_vm_and_obj (struct drm_exec *exec , struct
       drm_gem_object *obj , struct drm_gpuvm *vm );

literally just three args and an int return, and she's out here preventing deadlocks. iconic 👑

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🎀 ARGUMENTS 🎀

• exec — the exec context helper, and heads up: this is the one which will be initalized as part of the whole thing ✨
• obj — the GEM object that we're locking, her moment to shine 🔥
• vm — the VM we're locking, equally main character 💜

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🦋 DESCRIPTION 🦋

so here's the vibe check: operations that modify a VM frequently need to lock both the VM and the object being mapped/unmapped/etc. 😭 like yes, both, at the same time, it's a lot.

this helper uses drm_exec to acquire both locks at once, and the way it handles the potential deadlock/backoff scenarios that come up when multiple locks are involved? ate. 💀✨

fr fr, multiple locks = potential deadlock, and that's exactly the mess this helper is built to deal with. don't skip her 🫶

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/msm/msm_gem.h
• struct msm_gem_vm_log_entry(9)
• struct msm_gem_vm(9)
• struct msm_gem_vma(9)

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and that's the whole page, bestie 🍓 she lives in ./drivers/gpu/drm/msm (the source, iykyk), dated October 2026 — go forth and lock responsibly 💖🧚⭐