From: Karol Wachowski <karol.wachow...@linux.intel.com> Currently job->done_fence is added to every BO handle within a job. If job handle (command buffer) is shared between multiple submits, KMD will add the fence in each of them. Then bo_wait_ioctl() executed on command buffer will exit only when all jobs containing that handle are done.
This creates deadlock scenario for user mode driver in case when job handle is added as dependency of another job, because bo_wait_ioctl() of first job will wait until second job finishes, and second job can not finish before first one. Having fences added only to job buffer handle allows user space to execute bo_wait_ioctl() on the job even if it's handle is submitted with other job. Fixes: cd7272215c44 ("accel/ivpu: Add command buffer submission logic") Signed-off-by: Karol Wachowski <karol.wachow...@linux.intel.com> Signed-off-by: Stanislaw Gruszka <stanislaw.grus...@linux.intel.com> --- drivers/accel/ivpu/ivpu_job.c | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) diff --git a/drivers/accel/ivpu/ivpu_job.c b/drivers/accel/ivpu/ivpu_job.c index 910301fae435..3c6f1e16cf2f 100644 --- a/drivers/accel/ivpu/ivpu_job.c +++ b/drivers/accel/ivpu/ivpu_job.c @@ -461,26 +461,22 @@ ivpu_job_prepare_bos_for_submit(struct drm_file *file, struct ivpu_job *job, u32 job->cmd_buf_vpu_addr = bo->vpu_addr + commands_offset; - ret = drm_gem_lock_reservations((struct drm_gem_object **)job->bos, buf_count, - &acquire_ctx); + ret = drm_gem_lock_reservations((struct drm_gem_object **)job->bos, 1, &acquire_ctx); if (ret) { ivpu_warn(vdev, "Failed to lock reservations: %d\n", ret); return ret; } - for (i = 0; i < buf_count; i++) { - ret = dma_resv_reserve_fences(job->bos[i]->base.resv, 1); - if (ret) { - ivpu_warn(vdev, "Failed to reserve fences: %d\n", ret); - goto unlock_reservations; - } + ret = dma_resv_reserve_fences(bo->base.resv, 1); + if (ret) { + ivpu_warn(vdev, "Failed to reserve fences: %d\n", ret); + goto unlock_reservations; } - for (i = 0; i < buf_count; i++) - dma_resv_add_fence(job->bos[i]->base.resv, job->done_fence, DMA_RESV_USAGE_WRITE); + dma_resv_add_fence(bo->base.resv, job->done_fence, DMA_RESV_USAGE_WRITE); unlock_reservations: - drm_gem_unlock_reservations((struct drm_gem_object **)job->bos, buf_count, &acquire_ctx); + drm_gem_unlock_reservations((struct drm_gem_object **)job->bos, 1, &acquire_ctx); wmb(); /* Flush write combining buffers */ -- 2.25.1