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Message-ID: <CAF6AEGugcuV08G_pxjUGvhTbp8DFFG4ws3=oiP5PpbRf=SJdhQ@mail.gmail.com>
Date: Tue, 18 Apr 2023 07:31:21 -0700
From: Rob Clark <robdclark@...il.com>
To: Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
Rob Clark <robdclark@...il.com>,
dri-devel@...ts.freedesktop.org,
Rob Clark <robdclark@...omium.org>,
Abhinav Kumar <quic_abhinavk@...cinc.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
Akhil P Oommen <quic_akhilpo@...cinc.com>,
Chia-I Wu <olvaffe@...il.com>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<linux-arm-msm@...r.kernel.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<freedreno@...ts.freedesktop.org>,
open list <linux-kernel@...r.kernel.org>
Cc: Daniel Vetter <daniel@...ll.ch>
Subject: Re: [RFC 2/3] drm/msm: Rework get_comm_cmdline() helper
On Tue, Apr 18, 2023 at 1:34 AM Daniel Vetter <daniel@...ll.ch> wrote:
>
> On Tue, Apr 18, 2023 at 09:27:49AM +0100, Tvrtko Ursulin wrote:
> >
> > On 17/04/2023 21:12, Rob Clark wrote:
> > > From: Rob Clark <robdclark@...omium.org>
> > >
> > > Make it work in terms of ctx so that it can be re-used for fdinfo.
> > >
> > > Signed-off-by: Rob Clark <robdclark@...omium.org>
> > > ---
> > > drivers/gpu/drm/msm/adreno/adreno_gpu.c | 4 ++--
> > > drivers/gpu/drm/msm/msm_drv.c | 2 ++
> > > drivers/gpu/drm/msm/msm_gpu.c | 13 ++++++-------
> > > drivers/gpu/drm/msm/msm_gpu.h | 12 ++++++++++--
> > > drivers/gpu/drm/msm/msm_submitqueue.c | 1 +
> > > 5 files changed, 21 insertions(+), 11 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> > > index bb38e728864d..43c4e1fea83f 100644
> > > --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> > > +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> > > @@ -412,7 +412,7 @@ int adreno_set_param(struct msm_gpu *gpu, struct msm_file_private *ctx,
> > > /* Ensure string is null terminated: */
> > > str[len] = '\0';
> > > - mutex_lock(&gpu->lock);
> > > + mutex_lock(&ctx->lock);
> > > if (param == MSM_PARAM_COMM) {
> > > paramp = &ctx->comm;
> > > @@ -423,7 +423,7 @@ int adreno_set_param(struct msm_gpu *gpu, struct msm_file_private *ctx,
> > > kfree(*paramp);
> > > *paramp = str;
> > > - mutex_unlock(&gpu->lock);
> > > + mutex_unlock(&ctx->lock);
> > > return 0;
> > > }
> > > diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> > > index 3d73b98d6a9c..ca0e89e46e13 100644
> > > --- a/drivers/gpu/drm/msm/msm_drv.c
> > > +++ b/drivers/gpu/drm/msm/msm_drv.c
> > > @@ -581,6 +581,8 @@ static int context_init(struct drm_device *dev, struct drm_file *file)
> > > rwlock_init(&ctx->queuelock);
> > > kref_init(&ctx->ref);
> > > + ctx->pid = get_pid(task_pid(current));
> >
> > Would it simplify things for msm if DRM core had an up to date file->pid as
> > proposed in
> > https://patchwork.freedesktop.org/patch/526752/?series=109902&rev=4 ? It
> > gets updated if ioctl issuer is different than fd opener and this being
> > context_init here reminded me of it. Maybe you wouldn't have to track the
> > pid in msm?
The problem is that we also need this for gpu devcore dumps, which
could happen after the drm_file is closed. The ctx can outlive the
file.
But the ctx->pid has the same problem as the existing file->pid when
it comes to Xorg.. hopefully over time that problem just goes away. I
guess I could do a similar dance to your patch to update the pid
whenever (for ex) a submitqueue is created.
> Can we go one step further and let the drm fdinfo stuff print these new
> additions? Consistency across drivers and all that.
Hmm, I guess I could _also_ store the overridden comm/cmdline in
drm_file. I still need to track it in ctx (msm_file_private) because
I could need it after the file is closed.
Maybe it could be useful to have a gl extension to let the app set a
name on the context so that this is useful beyond native-ctx (ie.
maybe it would be nice to see that "chrome: lwn.net" is using less gpu
memory than "chrome: phoronix.com", etc)
BR,
-R
> Also for a generic trigger I think any driver ioctl is good enough (we
> only really need to avoid the auth dance when you're not on a render
> node).
> -Daniel
>
> >
> > Regards,
> >
> > Tvrtko
> >
> > > + mutex_init(&ctx->lock);
> > > msm_submitqueue_init(dev, ctx);
> > > ctx->aspace = msm_gpu_create_private_address_space(priv->gpu, current);
> > > diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
> > > index c403912d13ab..f0f4f845c32d 100644
> > > --- a/drivers/gpu/drm/msm/msm_gpu.c
> > > +++ b/drivers/gpu/drm/msm/msm_gpu.c
> > > @@ -327,18 +327,17 @@ find_submit(struct msm_ringbuffer *ring, uint32_t fence)
> > > static void retire_submits(struct msm_gpu *gpu);
> > > -static void get_comm_cmdline(struct msm_gem_submit *submit, char **comm, char **cmd)
> > > +static void get_comm_cmdline(struct msm_file_private *ctx, char **comm, char **cmd)
> > > {
> > > - struct msm_file_private *ctx = submit->queue->ctx;
> > > struct task_struct *task;
> > > - WARN_ON(!mutex_is_locked(&submit->gpu->lock));
> > > -
> > > /* Note that kstrdup will return NULL if argument is NULL: */
> > > + mutex_lock(&ctx->lock);
> > > *comm = kstrdup(ctx->comm, GFP_KERNEL);
> > > *cmd = kstrdup(ctx->cmdline, GFP_KERNEL);
> > > + mutex_unlock(&ctx->lock);
> > > - task = get_pid_task(submit->pid, PIDTYPE_PID);
> > > + task = get_pid_task(ctx->pid, PIDTYPE_PID);
> > > if (!task)
> > > return;
> > > @@ -372,7 +371,7 @@ static void recover_worker(struct kthread_work *work)
> > > if (submit->aspace)
> > > submit->aspace->faults++;
> > > - get_comm_cmdline(submit, &comm, &cmd);
> > > + get_comm_cmdline(submit->queue->ctx, &comm, &cmd);
> > > if (comm && cmd) {
> > > DRM_DEV_ERROR(dev->dev, "%s: offending task: %s (%s)\n",
> > > @@ -460,7 +459,7 @@ static void fault_worker(struct kthread_work *work)
> > > goto resume_smmu;
> > > if (submit) {
> > > - get_comm_cmdline(submit, &comm, &cmd);
> > > + get_comm_cmdline(submit->queue->ctx, &comm, &cmd);
> > > /*
> > > * When we get GPU iova faults, we can get 1000s of them,
> > > diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
> > > index 7a4fa1b8655b..b2023a42116b 100644
> > > --- a/drivers/gpu/drm/msm/msm_gpu.h
> > > +++ b/drivers/gpu/drm/msm/msm_gpu.h
> > > @@ -377,17 +377,25 @@ struct msm_file_private {
> > > */
> > > int sysprof;
> > > + /** @pid: Process that opened this file. */
> > > + struct pid *pid;
> > > +
> > > + /**
> > > + * lock: Protects comm and cmdline
> > > + */
> > > + struct mutex lock;
> > > +
> > > /**
> > > * comm: Overridden task comm, see MSM_PARAM_COMM
> > > *
> > > - * Accessed under msm_gpu::lock
> > > + * Accessed under msm_file_private::lock
> > > */
> > > char *comm;
> > > /**
> > > * cmdline: Overridden task cmdline, see MSM_PARAM_CMDLINE
> > > *
> > > - * Accessed under msm_gpu::lock
> > > + * Accessed under msm_file_private::lock
> > > */
> > > char *cmdline;
> > > diff --git a/drivers/gpu/drm/msm/msm_submitqueue.c b/drivers/gpu/drm/msm/msm_submitqueue.c
> > > index 0e803125a325..0444ba04fa06 100644
> > > --- a/drivers/gpu/drm/msm/msm_submitqueue.c
> > > +++ b/drivers/gpu/drm/msm/msm_submitqueue.c
> > > @@ -61,6 +61,7 @@ void __msm_file_private_destroy(struct kref *kref)
> > > }
> > > msm_gem_address_space_put(ctx->aspace);
> > > + put_pid(ctx->pid);
> > > kfree(ctx->comm);
> > > kfree(ctx->cmdline);
> > > kfree(ctx);
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
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