DRM wait ioctls express their timeout in one of two ways: as an absolute deadline in ns, or as a duration in ns. The core has a helper for the first form, drm_timeout_abs_to_jiffies(), which panfrost, lima, tegra, xe and some accel drivers use. However, there is no equivalent for the second form, so the drivers that take a duration convert it themselves.
For example, i915 has a local helper to handle the relative timeout case, and v3d carries a copy of it. This series moves that conversion into a DRM helper called drm_timeout_rel_to_jiffies(), next to the absolute variant, and converts the drivers that were open-coding either form. This series becomes particularly relevant as the new helper will be used in the next version of the series "drm/vc4: Switch to DRM GPU scheduler" [1]. With this series, we avoid another duplication of the nsecs_to_jiffies_timeout() function (and thanks Tvrtko for the suggestion). PATCH 1 moves drm_timeout_abs_to_jiffies() out of drm_syncobj.c and into a file of its own, so that both helpers live together. PATCH 2 adds a helper for the relative variant. Patches 3 to 6 convert amdgpu, v3d, i915 and vc4. Let me know your thoughts about it. [1] https://lore.kernel.org/dri-devel/[email protected]/T/ Best regards, - Maíra --- v1 -> v2: https://lore.kernel.org/r/[email protected] - [2/6] Add comment discouraging the use of relative timeouts in uAPIs (Christian König) - [3/6] Make it more explicit that any timeout that doesn't fit in a s64 is mapped into an infinite wait (Christian König) --- Maíra Canal (6): drm: Move drm_timeout_abs_to_jiffies() to drm_timeout.c drm: Add drm_timeout_rel_to_jiffies() drm/amdgpu: Use drm_timeout_abs_to_jiffies() drm/v3d: Use drm_timeout_rel_to_jiffies() drm/i915: Use drm_timeout_rel_to_jiffies() drm/vc4: Use drm_timeout_rel_to_jiffies() drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 20 ++------ drivers/gpu/drm/drm_syncobj.c | 33 ------------- drivers/gpu/drm/drm_timeout.c | 81 ++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/gem/i915_gem_wait.c | 17 ++----- drivers/gpu/drm/v3d/v3d_bo.c | 3 +- drivers/gpu/drm/v3d/v3d_drv.h | 10 ---- drivers/gpu/drm/vc4/vc4_gem.c | 3 +- include/drm/drm_utils.h | 1 + 9 files changed, 94 insertions(+), 75 deletions(-) --- base-commit: 5d2584e2ffaabf2d420edcb2d120209e151f8dce change-id: 20260809-drm-timeout-helpers-55473e4879d1
