On Fri Aug 06, 2021 at 11:48:04AM +0200, Christian König wrote:
>
>
> Am 06.08.21 um 07:52 schrieb Jingwen Chen:
> > On Thu Aug 05, 2021 at 05:13:22PM -0400, Andrey Grodzovsky wrote:
> > > On 2021-08-05 4:31 a.m., Jingwen Chen wrote:
> > > > From: Jack Zhang <Jack.Zhang1@xxxxxxx>
> > > >
> > > > Why: Previously hw fence is alloced separately with job.
> > > > It caused historical lifetime issues and corner cases.
> > > > The ideal situation is to take fence to manage both job
> > > > and fence's lifetime, and simplify the design of gpu-scheduler.
> > > >
> > > > How:
> > > > We propose to embed hw_fence into amdgpu_job.
> > > > 1. We cover the normal job submission by this method.
> > > > 2. For ib_test, and submit without a parent job keep the
> > > > legacy way to create a hw fence separately.
> > > > v2:
> > > > use AMDGPU_FENCE_FLAG_EMBED_IN_JOB_BIT to show that the fence is
> > > > embeded in a job.
> > > >
> > > > Signed-off-by: Jingwen Chen <Jingwen.Chen2@xxxxxxx>
> > > > Signed-off-by: Jack Zhang <Jack.Zhang7@xxxxxxxxxxx>
> > > > ---
> > > > drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c | 1 -
> > > > drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 2 +-
> > > > drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 63 ++++++++++++++++-----
> > > > drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c | 2 +-
> > > > drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 35 ++++++++----
> > > > drivers/gpu/drm/amd/amdgpu/amdgpu_job.h | 4 +-
> > > > drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h | 5 +-
> > > > drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 2 +-
> > > > 8 files changed, 84 insertions(+), 30 deletions(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
> > > > index 7b46ba551cb2..3003ee1c9487 100644
> > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
> > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
> > > > @@ -714,7 +714,6 @@ int amdgpu_amdkfd_submit_ib(struct kgd_dev *kgd, enum kgd_engine_type engine,
> > > > ret = dma_fence_wait(f, false);
> > > > err_ib_sched:
> > > > - dma_fence_put(f);
> > > > amdgpu_job_free(job);
> > > > err:
> > > > return ret;
> > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
> > > > index 536005bff24a..277128846dd1 100644
> > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
> > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
> > > > @@ -1414,7 +1414,7 @@ static void amdgpu_ib_preempt_mark_partial_job(struct amdgpu_ring *ring)
> > > > continue;
> > > > }
> > > > job = to_amdgpu_job(s_job);
> > > > - if (preempted && job->fence == fence)
> > > > + if (preempted && (&job->hw_fence) == fence)
> > > > /* mark the job as preempted */
> > > > job->preemption_status |= AMDGPU_IB_PREEMPTED;
> > > > }
> > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> > > > index 7495911516c2..5e29d797a265 100644
> > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
> > > > @@ -129,30 +129,46 @@ static u32 amdgpu_fence_read(struct amdgpu_ring *ring)
> > > > *
> > > > * @ring: ring the fence is associated with
> > > > * @f: resulting fence object
> > > > + * @job: job the fence is embeded in
> > > > * @flags: flags to pass into the subordinate .emit_fence() call
> > > > *
> > > > * Emits a fence command on the requested ring (all asics).
> > > > * Returns 0 on success, -ENOMEM on failure.
> > > > */
> > > > -int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f,
> > > > +int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f, struct amdgpu_job *job,
> > > > unsigned flags)
> > > > {
> > > > struct amdgpu_device *adev = ring->adev;
> > > > - struct amdgpu_fence *fence;
> > > > + struct dma_fence *fence;
> > > > + struct amdgpu_fence *am_fence;
> > > > struct dma_fence __rcu **ptr;
> > > > uint32_t seq;
> > > > int r;
> > > > - fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_KERNEL);
> > > > - if (fence == NULL)
> > > > - return -ENOMEM;
> > > > + if (job == NULL) {
> > > > + /* create a sperate hw fence */
> > > > + am_fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_ATOMIC);
> > > > + if (am_fence == NULL)
> > > > + return -ENOMEM;
> > > > + fence = &am_fence->base;
> > > > + am_fence->ring = ring;
> > > > + } else {
> > > > + /* take use of job-embedded fence */
> > > > + fence = &job->hw_fence;
> > > > + job->ring = ring;
> > >
> > > If you would make hw_fence of type amdgpu_fence
> > > you could probably avoid the special job->ring = ring
> > > See more in related comment at the bottom
> > >
> > Hi Andry,
> >
> > I'm only make the amdgpu_fence for the fence without job parameter
> > provided to amdgpu_fence_emit. For embeded fence which is the hw_fence
> > in amdgpu_job, it will be allocated along with amdgpu_job as dma_fence.
>
> When you have the job and need the ring you can just do
> conatiner_of(job->sched, struct amdgpu_ring, sched).
>
> No need for an extra ring pointer here.
>
> Regards,
> Christian.
I see, I will change this.
Best Regards,
JingWen Chen
>
> >
> > Regards,
> > Jingwen Chen
> > > > + }
> > > > seq = ++ring->fence_drv.sync_seq;
> > > > - fence->ring = ring;
> > > > - dma_fence_init(&fence->base, &amdgpu_fence_ops,
> > > > + dma_fence_init(fence, &amdgpu_fence_ops,
> > > > &ring->fence_drv.lock,
> > > > adev->fence_context + ring->idx,
> > > > seq);
> > > > +
> > > > + if (job != NULL) {
> > > > + /* mark this fence has a parent job */
> > > > + set_bit(AMDGPU_FENCE_FLAG_EMBED_IN_JOB_BIT, &fence->flags);
> > > > + }
> > > > +
> > > > amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
> > > > seq, flags | AMDGPU_FENCE_FLAG_INT);
> > > > pm_runtime_get_noresume(adev_to_drm(adev)->dev);
> > > > @@ -175,9 +191,9 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f,
> > > > /* This function can't be called concurrently anyway, otherwise
> > > > * emitting the fence would mess up the hardware ring buffer.
> > > > */
> > > > - rcu_assign_pointer(*ptr, dma_fence_get(&fence->base));
> > > > + rcu_assign_pointer(*ptr, dma_fence_get(fence));
> > > > - *f = &fence->base;
> > > > + *f = fence;
> > > > return 0;
> > > > }
> > > > @@ -621,8 +637,16 @@ static const char *amdgpu_fence_get_driver_name(struct dma_fence *fence)
> > > > static const char *amdgpu_fence_get_timeline_name(struct dma_fence *f)
> > > > {
> > > > - struct amdgpu_fence *fence = to_amdgpu_fence(f);
> > > > - return (const char *)fence->ring->name;
> > > > + struct amdgpu_ring *ring;
> > > > +
> > > > + if (test_bit(AMDGPU_FENCE_FLAG_EMBED_IN_JOB_BIT, &f->flags)) {
> > > > + struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
> > > > +
> > > > + ring = job->ring;
> > > > + } else {
> > > > + ring = to_amdgpu_fence(f)->ring;
> > > > + }
> > >
> > > Same as above
> > >
> > >
> > > > + return (const char *)ring->name;
> > > > }
> > > > /**
> > > > @@ -656,8 +680,20 @@ static bool amdgpu_fence_enable_signaling(struct dma_fence *f)
> > > > static void amdgpu_fence_free(struct rcu_head *rcu)
> > > > {
> > > > struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
> > > > - struct amdgpu_fence *fence = to_amdgpu_fence(f);
> > > > - kmem_cache_free(amdgpu_fence_slab, fence);
> > > > +
> > > > + if (test_bit(AMDGPU_FENCE_FLAG_EMBED_IN_JOB_BIT, &f->flags)) {
> > > > + /* free job if fence has a parent job */
> > > > + struct amdgpu_job *job;
> > > > +
> > > > + job = container_of(f, struct amdgpu_job, hw_fence);
> > > > + kfree(job);
> > > > + } else {
> > > > + /* free fence_slab if it's separated fence*/
> > > > + struct amdgpu_fence *fence;
> > > > +
> > > > + fence = to_amdgpu_fence(f);
> > > > + kmem_cache_free(amdgpu_fence_slab, fence);
> > > > + }
> > > > }
> > > > /**
> > > > @@ -680,6 +716,7 @@ static const struct dma_fence_ops amdgpu_fence_ops = {
> > > > .release = amdgpu_fence_release,
> > > > };
> > > > +
> > > > /*
> > > > * Fence debugfs
> > > > */
> > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> > > > index ec65ab0ddf89..c076a6b9a5a2 100644
> > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> > > > @@ -262,7 +262,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
> > > > fence_flags | AMDGPU_FENCE_FLAG_64BIT);
> > > > }
> > > > - r = amdgpu_fence_emit(ring, f, fence_flags);
> > > > + r = amdgpu_fence_emit(ring, f, job, fence_flags);
> > > > if (r) {
> > > > dev_err(adev->dev, "failed to emit fence (%d)\n", r);
> > > > if (job && job->vmid)
> > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> > > > index d33e6d97cc89..65a395060de2 100644
> > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
> > > > @@ -127,11 +127,16 @@ void amdgpu_job_free_resources(struct amdgpu_job *job)
> > > > {
> > > > struct amdgpu_ring *ring = to_amdgpu_ring(job->base.sched);
> > > > struct dma_fence *f;
> > > > + struct dma_fence *hw_fence;
> > > > unsigned i;
> > > > - /* use sched fence if available */
> > > > - f = job->base.s_fence ? &job->base.s_fence->finished : job->fence;
> > > > + if (job->hw_fence.ops == NULL)
> > > > + hw_fence = job->external_hw_fence;
> > > > + else
> > > > + hw_fence = &job->hw_fence;
> > > > + /* use sched fence if available */
> > > > + f = job->base.s_fence ? &job->base.s_fence->finished : hw_fence;
> > > > for (i = 0; i < job->num_ibs; ++i)
> > > > amdgpu_ib_free(ring->adev, &job->ibs[i], f);
> > > > }
> > > > @@ -142,20 +147,27 @@ static void amdgpu_job_free_cb(struct drm_sched_job *s_job)
> > > > drm_sched_job_cleanup(s_job);
> > > > - dma_fence_put(job->fence);
> > > > amdgpu_sync_free(&job->sync);
> > > > amdgpu_sync_free(&job->sched_sync);
> > > > - kfree(job);
> > > > +
> > > > + /* only put the hw fence if has embedded fence */
> > > > + if (job->hw_fence.ops != NULL)
> > > > + dma_fence_put(&job->hw_fence);
> > > > + else
> > > > + kfree(job);
> > > > }
> > > > void amdgpu_job_free(struct amdgpu_job *job)
> > > > {
> > > > amdgpu_job_free_resources(job);
> > > > -
> > > > - dma_fence_put(job->fence);
> > > > amdgpu_sync_free(&job->sync);
> > > > amdgpu_sync_free(&job->sched_sync);
> > > > - kfree(job);
> > > > +
> > > > + /* only put the hw fence if has embedded fence */
> > > > + if (job->hw_fence.ops != NULL)
> > > > + dma_fence_put(&job->hw_fence);
> > > > + else
> > > > + kfree(job);
> > > > }
> > > > int amdgpu_job_submit(struct amdgpu_job *job, struct drm_sched_entity *entity,
> > > > @@ -184,11 +196,14 @@ int amdgpu_job_submit_direct(struct amdgpu_job *job, struct amdgpu_ring *ring,
> > > > job->base.sched = &ring->sched;
> > > > r = amdgpu_ib_schedule(ring, job->num_ibs, job->ibs, NULL, fence);
> > > > - job->fence = dma_fence_get(*fence);
> > > > + /* record external_hw_fence for direct submit */
> > > > + job->external_hw_fence = dma_fence_get(*fence);
> > > > if (r)
> > > > return r;
> > > > amdgpu_job_free(job);
> > > > + dma_fence_put(*fence);
> > > > +
> > > > return 0;
> > > > }
> > > > @@ -246,10 +261,8 @@ static struct dma_fence *amdgpu_job_run(struct drm_sched_job *sched_job)
> > > > if (r)
> > > > DRM_ERROR("Error scheduling IBs (%d)\n", r);
> > > > }
> > > > - /* if gpu reset, hw fence will be replaced here */
> > > > - dma_fence_put(job->fence);
> > > > - job->fence = dma_fence_get(fence);
> > > > + dma_fence_get(fence);
> > > > amdgpu_job_free_resources(job);
> > > > fence = r ? ERR_PTR(r) : fence;
> > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.h
> > > > index 81caac9b958a..92324c978534 100644
> > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.h
> > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.h
> > > > @@ -46,7 +46,9 @@ struct amdgpu_job {
> > > > struct amdgpu_sync sync;
> > > > struct amdgpu_sync sched_sync;
> > > > struct amdgpu_ib *ibs;
> > > > - struct dma_fence *fence; /* the hw fence */
> > > > + struct dma_fence hw_fence;
> > > > + struct amdgpu_ring *ring;
> > > Why not instead of 2 fields above just embed struct amdgpu_fence as
> > > hw_fence and by this save the extra 'ring' field handling ?
> > >
> > > Andrey
> > >
> > >
> > > > + struct dma_fence *external_hw_fence;
> > > > uint32_t preamble_status;
> > > > uint32_t preemption_status;
> > > > uint32_t num_ibs;
> > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> > > > index 9c11ced4312c..03d4b29a76d6 100644
> > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
> > > > @@ -48,6 +48,9 @@
> > > > #define AMDGPU_FENCE_FLAG_INT (1 << 1)
> > > > #define AMDGPU_FENCE_FLAG_TC_WB_ONLY (1 << 2)
> > > > +/* fence flag bit to indicate the face is embeded in job*/
> > > > +#define AMDGPU_FENCE_FLAG_EMBED_IN_JOB_BIT (DMA_FENCE_FLAG_USER_BITS + 1)
> > > > +
> > > > #define to_amdgpu_ring(s) container_of((s), struct amdgpu_ring, sched)
> > > > #define AMDGPU_IB_POOL_SIZE (1024 * 1024)
> > > > @@ -118,7 +121,7 @@ void amdgpu_fence_driver_hw_init(struct amdgpu_device *adev);
> > > > void amdgpu_fence_driver_hw_fini(struct amdgpu_device *adev);
> > > > int amdgpu_fence_driver_sw_init(struct amdgpu_device *adev);
> > > > void amdgpu_fence_driver_sw_fini(struct amdgpu_device *adev);
> > > > -int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **fence,
> > > > +int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **fence, struct amdgpu_job *job,
> > > > unsigned flags);
> > > > int amdgpu_fence_emit_polling(struct amdgpu_ring *ring, uint32_t *s,
> > > > uint32_t timeout);
> > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> > > > index 2a88ed5d983b..2af8860d74cc 100644
> > > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> > > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> > > > @@ -1218,7 +1218,7 @@ int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job,
> > > > amdgpu_gmc_emit_pasid_mapping(ring, job->vmid, job->pasid);
> > > > if (vm_flush_needed || pasid_mapping_needed) {
> > > > - r = amdgpu_fence_emit(ring, &fence, 0);
> > > > + r = amdgpu_fence_emit(ring, &fence, NULL, 0);
> > > > if (r)
> > > > return r;
> > > > }
>
