Currently, v3d only supports single in/out syncobj per submission (in v3d_submit_cl, there are two in_sync, one for bin and another for render job); however, Vulkan queue submit operations expect multiples wait and signal semaphores. This series extends v3d interface and job dependency operations to handle more than one in/out syncobj.
The first patch just decouples the steps to lookup and add job dependency from the job init code, since the operation repeats for every syncobj that a job should wait before starting. So, the fourth patch of this series will reuse it to handle multiples wait for semaphores.
The second patch moves job memory allocation to v3d_job_init() for any type of v3d_job-based job. The main goal is to prevent errors when handling job initialization failures (doing a proper cleanup).
The third patch extends our interface by using a generic extension. This approach was inspired by i915_user_extension[1] and amd_cs_chunks[2] to give a little more flexibility in adding other submission features in the future. Therefore, the list of extensions would work as a hub of features that use an id to determine the corresponding feature data type.
With this base, the fourth patch adds multiple wait/signal semaphores support. For this, we add to the list of the generic extensions a new data type (drm_v3d_multi_sync) that points to two arrays of syncobjs (in/out) and also determines (wait_stage) the job to add wait dependencies (v3d_queue). An auxiliary struct (v3d_submit_ext) is used when parsing submission extensions. Finally, we reserve some space in the semaphore struct (drm_v3d_sem) to accommodate timeline semaphores that we aim to add support soon (same reason for already defining v3d_submit_outsync).
[1] https://cgit.freedesktop.org/drm/drm-misc/commit/drivers/gpu/drm/i915/i915_u... [2] https://cgit.freedesktop.org/drm/drm-misc/tree/include/uapi/drm/amdgpu_drm.h...
In the mesa side, the work related to this series is in progress at https://gitlab.freedesktop.org/mwen/mesa/-/commit/6c340bb35203a0418af87a7921...
v2: - move job mem alloc to v3d_job_init (Iago) - simplify and subclass the generic extension struct (Daniel) - make job dependency conditions more understandable (Iago)
v3 (Iago): - job should be initialized NULL - fix error handling for pm ops in v3d_job_init - remove irrelevant comment - fix multisync conditions to multiple vs single sempahores
Melissa Wen (4): drm/v3d: decouple adding job dependencies steps from job init drm/v3d: alloc and init job in one shot drm/v3d: add generic ioctl extension drm/v3d: add multiple syncobjs support
drivers/gpu/drm/v3d/v3d_drv.c | 10 +- drivers/gpu/drm/v3d/v3d_drv.h | 24 ++- drivers/gpu/drm/v3d/v3d_gem.c | 390 +++++++++++++++++++++++++--------- include/uapi/drm/v3d_drm.h | 78 +++++++ 4 files changed, 389 insertions(+), 113 deletions(-)