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Message-ID: <Z5jwD0DxNrMdo-q8@pollux>
Date: Tue, 28 Jan 2025 15:56:15 +0100
From: Danilo Krummrich <dakr@...hat.com>
To: Philipp Stanner <phasta@...nel.org>
Cc: Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
Xinhui Pan <Xinhui.Pan@....com>, David Airlie <airlied@...il.com>,
Simona Vetter <simona@...ll.ch>,
Lucas Stach <l.stach@...gutronix.de>,
Russell King <linux+etnaviv@...linux.org.uk>,
Christian Gmeiner <christian.gmeiner@...il.com>,
Frank Binns <frank.binns@...tec.com>,
Matt Coster <matt.coster@...tec.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Qiang Yu <yuq825@...il.com>, Rob Clark <robdclark@...il.com>,
Sean Paul <sean@...rly.run>, Konrad Dybcio <konradybcio@...nel.org>,
Abhinav Kumar <quic_abhinavk@...cinc.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Marijn Suijten <marijn.suijten@...ainline.org>,
Karol Herbst <kherbst@...hat.com>, Lyude Paul <lyude@...hat.com>,
Boris Brezillon <boris.brezillon@...labora.com>,
Rob Herring <robh@...nel.org>, Steven Price <steven.price@....com>,
Liviu Dudau <liviu.dudau@....com>,
Matthew Brost <matthew.brost@...el.com>,
Melissa Wen <mwen@...lia.com>,
Maíra Canal <mcanal@...lia.com>,
Lucas De Marchi <lucas.demarchi@...el.com>,
Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Sunil Khatri <sunil.khatri@....com>,
Lijo Lazar <lijo.lazar@....com>,
Hawking Zhang <Hawking.Zhang@....com>,
Mario Limonciello <mario.limonciello@....com>,
Ma Jun <Jun.Ma2@....com>, Yunxiang Li <Yunxiang.Li@....com>,
amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, etnaviv@...ts.freedesktop.org,
lima@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
freedreno@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
intel-xe@...ts.freedesktop.org
Subject: Re: [PATCH v2] drm/sched: Use struct for drm_sched_init() params
On Tue, Jan 28, 2025 at 03:29:27PM +0100, Philipp Stanner wrote:
> drm_sched_init() has a great many parameters and upcoming new
> functionality for the scheduler might add even more. Generally, the
> great number of parameters reduces readability and has already caused
> one missnaming in:
>
> commit 6f1cacf4eba7 ("drm/nouveau: Improve variable name in nouveau_sched_init()").
>
> Introduce a new struct for the scheduler init parameters and port all
> users.
>
> Signed-off-by: Philipp Stanner <phasta@...nel.org>
> ---
> Changes in v2:
> - Point out that the hang-limit is deprecated. (Christian)
> - Initialize the structs to 0 at declaration. (Planet Earth)
> - Don't set stuff explicitly to 0 / NULL. (Tvrtko)
> - Make the structs const where possible. (Boris)
> - v3d: Use just 1, universal, function for sched-init. (Maíra)
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 18 ++++--
> drivers/gpu/drm/etnaviv/etnaviv_sched.c | 20 +++----
> drivers/gpu/drm/imagination/pvr_queue.c | 18 ++++--
> drivers/gpu/drm/lima/lima_sched.c | 16 +++--
> drivers/gpu/drm/msm/msm_ringbuffer.c | 17 +++---
> drivers/gpu/drm/nouveau/nouveau_sched.c | 15 +++--
> drivers/gpu/drm/panfrost/panfrost_job.c | 20 ++++---
> drivers/gpu/drm/panthor/panthor_mmu.c | 16 +++--
> drivers/gpu/drm/panthor/panthor_sched.c | 29 +++++----
> drivers/gpu/drm/scheduler/sched_main.c | 50 ++++++----------
> drivers/gpu/drm/v3d/v3d_sched.c | 68 +++++++++-------------
> drivers/gpu/drm/xe/xe_execlist.c | 16 +++--
> drivers/gpu/drm/xe/xe_gpu_scheduler.c | 17 +++++-
> include/drm/gpu_scheduler.h | 37 ++++++++++--
> 14 files changed, 206 insertions(+), 151 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_sched.c b/drivers/gpu/drm/nouveau/nouveau_sched.c
> index 4412f2711fb5..b5aac8eebfdd 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_sched.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_sched.c
> @@ -404,7 +404,15 @@ nouveau_sched_init(struct nouveau_sched *sched, struct nouveau_drm *drm,
> {
> struct drm_gpu_scheduler *drm_sched = &sched->base;
> struct drm_sched_entity *entity = &sched->entity;
> - const long timeout = msecs_to_jiffies(NOUVEAU_SCHED_JOB_TIMEOUT_MS);
> + const struct drm_sched_init_args args = {
> + .ops = &nouveau_sched_ops,
> + .submit_wq = wq,
> + .num_rqs = DRM_SCHED_PRIORITY_COUNT,
> + .credit_limit = credit_limit,
> + .timeout = msecs_to_jiffies(NOUVEAU_SCHED_JOB_TIMEOUT_MS),
> + .name = "nouveau_sched",
> + .dev = drm->dev->dev
> + };
> int ret;
>
> if (!wq) {
> @@ -416,10 +424,7 @@ nouveau_sched_init(struct nouveau_sched *sched, struct nouveau_drm *drm,
> sched->wq = wq;
This change breaks Nouveau, you need to set args.submit_wq here as well.
> }
>
> - ret = drm_sched_init(drm_sched, &nouveau_sched_ops, wq,
> - NOUVEAU_SCHED_PRIORITY_COUNT,
> - credit_limit, 0, timeout,
> - NULL, NULL, "nouveau_sched", drm->dev->dev);
> + ret = drm_sched_init(drm_sched, &args);
> if (ret)
> goto fail_wq;
>
> diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> index 5844a7f639e0..44713cfdcd74 100644
> --- a/drivers/gpu/drm/panthor/panthor_sched.c
> +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> @@ -3284,6 +3284,22 @@ static struct panthor_queue *
> group_create_queue(struct panthor_group *group,
> const struct drm_panthor_queue_create *args)
> {
> + const struct drm_sched_init_args sched_args = {
> + .ops = &panthor_queue_sched_ops,
> + .submit_wq = group->ptdev->scheduler->wq,
> + .num_rqs = 1,
> + /*
> + * The credit limit argument tells us the total number of
> + * instructions across all CS slots in the ringbuffer, with
> + * some jobs requiring twice as many as others, depending on
> + * their profiling status.
> + */
> + .credit_limit = args->ringbuf_size / sizeof(u64),
> + .timeout = msecs_to_jiffies(JOB_TIMEOUT_MS),
> + .timeout_wq = group->ptdev->reset.wq,
> + .name = "panthor-queue",
> + .dev = group->ptdev->base.dev
> + };
> struct drm_gpu_scheduler *drm_sched;
> struct panthor_queue *queue;
> int ret;
> @@ -3354,17 +3370,8 @@ group_create_queue(struct panthor_group *group,
> if (ret)
> goto err_free_queue;
>
> - /*
> - * Credit limit argument tells us the total number of instructions
> - * across all CS slots in the ringbuffer, with some jobs requiring
> - * twice as many as others, depending on their profiling status.
> - */
> - ret = drm_sched_init(&queue->scheduler, &panthor_queue_sched_ops,
> - group->ptdev->scheduler->wq, 1,
> - args->ringbuf_size / sizeof(u64),
> - 0, msecs_to_jiffies(JOB_TIMEOUT_MS),
> - group->ptdev->reset.wq,
> - NULL, "panthor-queue", group->ptdev->base.dev);
> +
This creates two empty lines.
> + ret = drm_sched_init(&queue->scheduler, &sched_args);
> if (ret)
> goto err_free_queue;
>
> diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
> index a48be16ab84f..6295b2654a7c 100644
> --- a/drivers/gpu/drm/scheduler/sched_main.c
> +++ b/drivers/gpu/drm/scheduler/sched_main.c
> @@ -1244,40 +1244,24 @@ static void drm_sched_run_job_work(struct work_struct *w)
> * drm_sched_init - Init a gpu scheduler instance
> *
> * @sched: scheduler instance
> - * @ops: backend operations for this scheduler
> - * @submit_wq: workqueue to use for submission. If NULL, an ordered wq is
> - * allocated and used
> - * @num_rqs: number of runqueues, one for each priority, up to DRM_SCHED_PRIORITY_COUNT
> - * @credit_limit: the number of credits this scheduler can hold from all jobs
> - * @hang_limit: number of times to allow a job to hang before dropping it
> - * @timeout: timeout value in jiffies for the scheduler
> - * @timeout_wq: workqueue to use for timeout work. If NULL, the system_wq is
> - * used
> - * @score: optional score atomic shared with other schedulers
> - * @name: name used for debugging
> - * @dev: target &struct device
> + * @args: scheduler initialization arguments
> *
> * Return 0 on success, otherwise error code.
> */
> -int drm_sched_init(struct drm_gpu_scheduler *sched,
> - const struct drm_sched_backend_ops *ops,
> - struct workqueue_struct *submit_wq,
> - u32 num_rqs, u32 credit_limit, unsigned int hang_limit,
> - long timeout, struct workqueue_struct *timeout_wq,
> - atomic_t *score, const char *name, struct device *dev)
> +int drm_sched_init(struct drm_gpu_scheduler *sched, const struct drm_sched_init_args *args)
> {
> int i;
>
> - sched->ops = ops;
> - sched->credit_limit = credit_limit;
> - sched->name = name;
> - sched->timeout = timeout;
> - sched->timeout_wq = timeout_wq ? : system_wq;
> - sched->hang_limit = hang_limit;
> - sched->score = score ? score : &sched->_score;
> - sched->dev = dev;
> + sched->ops = args->ops;
> + sched->credit_limit = args->credit_limit;
> + sched->name = args->name;
> + sched->timeout = args->timeout;
> + sched->timeout_wq = args->timeout_wq ? : system_wq;
> + sched->hang_limit = args->hang_limit;
> + sched->score = args->score ? args->score : &sched->_score;
> + sched->dev = args->dev;
>
> - if (num_rqs > DRM_SCHED_PRIORITY_COUNT) {
> + if (args->num_rqs > DRM_SCHED_PRIORITY_COUNT) {
> /* This is a gross violation--tell drivers what the problem is.
> */
> drm_err(sched, "%s: num_rqs cannot be greater than DRM_SCHED_PRIORITY_COUNT\n",
> @@ -1292,16 +1276,16 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
> return 0;
> }
>
> - if (submit_wq) {
> - sched->submit_wq = submit_wq;
> + if (args->submit_wq) {
> + sched->submit_wq = args->submit_wq;
> sched->own_submit_wq = false;
> } else {
> #ifdef CONFIG_LOCKDEP
> - sched->submit_wq = alloc_ordered_workqueue_lockdep_map(name,
> + sched->submit_wq = alloc_ordered_workqueue_lockdep_map(args->name,
> WQ_MEM_RECLAIM,
> &drm_sched_lockdep_map);
> #else
> - sched->submit_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
> + sched->submit_wq = alloc_ordered_workqueue(args->name, WQ_MEM_RECLAIM);
> #endif
> if (!sched->submit_wq)
> return -ENOMEM;
> @@ -1309,11 +1293,11 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
> sched->own_submit_wq = true;
> }
>
> - sched->sched_rq = kmalloc_array(num_rqs, sizeof(*sched->sched_rq),
> + sched->sched_rq = kmalloc_array(args->num_rqs, sizeof(*sched->sched_rq),
> GFP_KERNEL | __GFP_ZERO);
> if (!sched->sched_rq)
> goto Out_check_own;
> - sched->num_rqs = num_rqs;
> + sched->num_rqs = args->num_rqs;
> for (i = DRM_SCHED_PRIORITY_KERNEL; i < sched->num_rqs; i++) {
> sched->sched_rq[i] = kzalloc(sizeof(*sched->sched_rq[i]), GFP_KERNEL);
> if (!sched->sched_rq[i])
> diff --git a/drivers/gpu/drm/xe/xe_execlist.c b/drivers/gpu/drm/xe/xe_execlist.c
> index a8c416a48812..db1c52dcf1a6 100644
> --- a/drivers/gpu/drm/xe/xe_execlist.c
> +++ b/drivers/gpu/drm/xe/xe_execlist.c
> @@ -332,6 +332,15 @@ static const struct drm_sched_backend_ops drm_sched_ops = {
> static int execlist_exec_queue_init(struct xe_exec_queue *q)
> {
> struct drm_gpu_scheduler *sched;
> + const struct drm_sched_init_args args = {
> + .ops = &drm_sched_ops,
> + .num_rqs = 1,
> + .credit_limit = q->lrc[0]->ring.size / MAX_JOB_SIZE_BYTES,
> + .hang_limit = XE_SCHED_HANG_LIMIT,
> + .timeout = XE_SCHED_JOB_TIMEOUT,
> + .name = q->hwe->name,
> + .dev = gt_to_xe(q->gt)->drm.dev
> + };
> struct xe_execlist_exec_queue *exl;
> struct xe_device *xe = gt_to_xe(q->gt);
> int err;
> @@ -346,11 +355,8 @@ static int execlist_exec_queue_init(struct xe_exec_queue *q)
>
> exl->q = q;
>
> - err = drm_sched_init(&exl->sched, &drm_sched_ops, NULL, 1,
> - q->lrc[0]->ring.size / MAX_JOB_SIZE_BYTES,
> - XE_SCHED_HANG_LIMIT, XE_SCHED_JOB_TIMEOUT,
> - NULL, NULL, q->hwe->name,
> - gt_to_xe(q->gt)->drm.dev);
> +
Two empty lines here as well.
> + err = drm_sched_init(&exl->sched, &args);
> if (err)
> goto err_free;
>
> diff --git a/drivers/gpu/drm/xe/xe_gpu_scheduler.c b/drivers/gpu/drm/xe/xe_gpu_scheduler.c
> index 50361b4638f9..be95f4cca007 100644
> --- a/drivers/gpu/drm/xe/xe_gpu_scheduler.c
> +++ b/drivers/gpu/drm/xe/xe_gpu_scheduler.c
> @@ -63,13 +63,24 @@ int xe_sched_init(struct xe_gpu_scheduler *sched,
> atomic_t *score, const char *name,
> struct device *dev)
> {
> + const struct drm_sched_init_args args = {
> + .ops = ops,
> + .submit_wq = submit_wq,
> + .num_rqs = 1,
> + .credit_limit = hw_submission,
> + .hang_limit = hang_limit,
> + .timeout = timeout,
> + .timeout_wq = timeout_wq,
> + .score = score,
> + .name = name,
> + .dev = dev
> + };
> +
> sched->ops = xe_ops;
> INIT_LIST_HEAD(&sched->msgs);
> INIT_WORK(&sched->work_process_msg, xe_sched_process_msg_work);
>
> - return drm_sched_init(&sched->base, ops, submit_wq, 1, hw_submission,
> - hang_limit, timeout, timeout_wq, score, name,
> - dev);
> + return drm_sched_init(&sched->base, &args);
> }
>
> void xe_sched_fini(struct xe_gpu_scheduler *sched)
> diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
> index a0ff08123f07..f0f5435598a8 100644
> --- a/include/drm/gpu_scheduler.h
> +++ b/include/drm/gpu_scheduler.h
> @@ -540,12 +540,39 @@ struct drm_gpu_scheduler {
> struct device *dev;
> };
>
> +/**
> + * struct drm_sched_init_args - parameters for initializing a DRM GPU scheduler
> + *
> + * @ops: backend operations provided by the driver
> + * @submit_wq: workqueue to use for submission. May be NULL.
> + * If NULL, an ordered wq is allocated and used.
> + * @num_rqs: Number of run-queues. This may be at most DRM_SCHED_PRIORITY_COUNT,
> + * as there's usually one run-queue per priority, but may be less.
> + * @credit_limit: the number of credits this scheduler can hold from all jobs
> + * @hang_limit: number of times to allow a job to hang before dropping it.
> + * This mechanism is DEPRECATED. Set it to 0.
> + * @timeout: timeout value in jiffies for the scheduler
> + * @timeout_wq: workqueue to use for timeout work. May be NULL.
> + * If NULL, the system_wq is used.
> + * @score: score atomic shared with other schedulers. May be NULL.
> + * @name: name used for debugging
> + * @dev: associated device. Used for debugging
> + */
This is weirdly formatted. Please align line breaks with the corresponding
number of spaces.
> +struct drm_sched_init_args {
> + const struct drm_sched_backend_ops *ops;
> + struct workqueue_struct *submit_wq;
> + struct workqueue_struct *timeout_wq;
> + u32 num_rqs;
> + u32 credit_limit;
> + unsigned int hang_limit;
> + long timeout;
> + atomic_t *score;
> + const char *name;
> + struct device *dev;
> +};
> +
> int drm_sched_init(struct drm_gpu_scheduler *sched,
> - const struct drm_sched_backend_ops *ops,
> - struct workqueue_struct *submit_wq,
> - u32 num_rqs, u32 credit_limit, unsigned int hang_limit,
> - long timeout, struct workqueue_struct *timeout_wq,
> - atomic_t *score, const char *name, struct device *dev);
> + const struct drm_sched_init_args *args);
>
> void drm_sched_fini(struct drm_gpu_scheduler *sched);
> int drm_sched_job_init(struct drm_sched_job *job,
> --
> 2.47.1
>
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