[PATCH v2 0/6] drm: Consolidate the wait timeout conversion helpers

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