From nobody Sat Feb 7 18:21:29 2026 Received: from madrid.collaboradmins.com (madrid.collaboradmins.com [46.235.227.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D77D6994A; Wed, 21 Feb 2024 16:14:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=46.235.227.194 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708532047; cv=none; b=OlpKm+uKT3/y9BsptAsIRu77k+Bg2svvZugG8w+MjZ6Hkylm3HssESDXiYxuY9OZ5HqnCtgv7o3ZJpV0rWyhBX7zWWpUCRtZ1qrzHvyumdWB2w/ahjLyUOjAavvsro0FNZW5VZ6KSoplBz7i1IsF4aFvrhUQQ/BGj8NOVoNlZrQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708532047; c=relaxed/simple; bh=JHBed4HhRS/+miDeC1Vba8uHd/woC+WKGVjOOcm9Eoc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=OxhT/oiaCH0TW2Yzo0cq447gTi0vhWztuCqZZxuMwg6SoDksRgfZ69alz1uEC0Z3nCC7jMPC0f30YpofiUWwVnN0lJq6P5yOvf667nZSmEkGV+gFmE52cyIu0qexG7YGDRw8pthmIsBc2RYd6TiBQRIdDkxWNcAP5J+KOdkIKRQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b=QyEFEWg4; arc=none smtp.client-ip=46.235.227.194 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b="QyEFEWg4" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1708532042; bh=JHBed4HhRS/+miDeC1Vba8uHd/woC+WKGVjOOcm9Eoc=; h=From:To:Cc:Subject:Date:From; b=QyEFEWg4iOj696uNgzJEjM7VVBBxs5TR8MhbBa8yDqmZLFylpV17ZC0v+v3V1T7eL pP9udLVigJOnISA+mi+rJ4g8a+h5shEq/PPyk46PGcQ0Md91kcwNlstwT6y0Rg+ObK BLIlnYBBWgEsHvj7P3H1+88kWgNH1/234/bRn+hxbMm89EtVU7tnkXDn6w9flCNiQ3 PnnxudmewEbTwgpv8sghHFxNCpba4YwuosgP666VBzEWGNhMHaT0efTJn4vzRMIVwp EM1loMtnW8am0K6rs3rzjdzSTAcmVnwwiP+ut2tL412oBvJqzwXypJWOaMf7XSMtxR GbBeI+CJg8v2w== Received: from localhost.localdomain (cola.collaboradmins.com [195.201.22.229]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: alarumbe) by madrid.collaboradmins.com (Postfix) with ESMTPSA id 9FB2F3781FE6; Wed, 21 Feb 2024 16:14:01 +0000 (UTC) From: =?UTF-8?q?Adri=C3=A1n=20Larumbe?= To: Boris Brezillon , Rob Herring , Steven Price , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Jonathan Corbet Cc: kernel@collabora.com, =?UTF-8?q?Adri=C3=A1n=20Larumbe?= , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org Subject: [PATCH] drm/panfrost: Replace fdinfo's profiling debugfs knob with sysfs Date: Wed, 21 Feb 2024 16:12:32 +0000 Message-ID: <20240221161237.2478193-1-adrian.larumbe@collabora.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Debugfs isn't always available in production builds that try to squeeze every single byte out of the kernel image, but we still need a way to toggle the timestamp and cycle counter registers so that jobs can be profiled for fdinfo's drm engine and cycle calculations. Drop the debugfs knob and replace it with a sysfs file that accomplishes the same functionality, and document its ABI in a separate file. Signed-off-by: Adri=C3=A1n Larumbe --- .../testing/sysfs-driver-panfrost-profiling | 10 +++ Documentation/gpu/panfrost.rst | 9 +++ drivers/gpu/drm/panfrost/Makefile | 5 +- drivers/gpu/drm/panfrost/panfrost_debugfs.c | 21 ------ drivers/gpu/drm/panfrost/panfrost_debugfs.h | 14 ---- drivers/gpu/drm/panfrost/panfrost_device.h | 5 +- drivers/gpu/drm/panfrost/panfrost_drv.c | 14 ++-- drivers/gpu/drm/panfrost/panfrost_job.c | 2 +- drivers/gpu/drm/panfrost/panfrost_sysfs.c | 74 +++++++++++++++++++ drivers/gpu/drm/panfrost/panfrost_sysfs.h | 15 ++++ 10 files changed, 124 insertions(+), 45 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-driver-panfrost-profili= ng delete mode 100644 drivers/gpu/drm/panfrost/panfrost_debugfs.c delete mode 100644 drivers/gpu/drm/panfrost/panfrost_debugfs.h create mode 100644 drivers/gpu/drm/panfrost/panfrost_sysfs.c create mode 100644 drivers/gpu/drm/panfrost/panfrost_sysfs.h diff --git a/Documentation/ABI/testing/sysfs-driver-panfrost-profiling b/Do= cumentation/ABI/testing/sysfs-driver-panfrost-profiling new file mode 100644 index 000000000000..ce54069714f3 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-panfrost-profiling @@ -0,0 +1,10 @@ +What: /sys/bus/.../drivers/panfrost/.../drm/../profiling/status +Date: February 2024 +KernelVersion: 6.8.0 +Contact: Adrian Larumbe +Description: + Get/set drm fdinfo's engine and cycles profiling status. + Valid values are: + 0: Disable fdinfo job profiling sources. This disables both the GPU's + timestamp and cycle counter registers. + 1: Enable the above. diff --git a/Documentation/gpu/panfrost.rst b/Documentation/gpu/panfrost.rst index b80e41f4b2c5..be4ac282ef63 100644 --- a/Documentation/gpu/panfrost.rst +++ b/Documentation/gpu/panfrost.rst @@ -38,3 +38,12 @@ the currently possible format options: =20 Possible `drm-engine-` key names are: `fragment`, and `vertex-tiler`. `drm-curfreq-` values convey the current operating frequency for that engi= ne. + +Users must bear in mind that engine and cycle sampling are disabled by def= ault, +because of power saving concerns. `fdinfo` users and benchmark application= s which +query the fdinfo file must make sure to toggle the job profiling status of= the +driver by writing into the appropriate sysfs node:: + + echo > /sys/bus/platform/drivers/panfrost/[a-f0-9]*.gpu/drm/card1/= profiling + +Where `N` is either `0` or `1`, depending on the desired enablement status. diff --git a/drivers/gpu/drm/panfrost/Makefile b/drivers/gpu/drm/panfrost/M= akefile index 2c01c1e7523e..6e718595d8a6 100644 --- a/drivers/gpu/drm/panfrost/Makefile +++ b/drivers/gpu/drm/panfrost/Makefile @@ -10,8 +10,7 @@ panfrost-y :=3D \ panfrost_job.o \ panfrost_mmu.o \ panfrost_perfcnt.o \ - panfrost_dump.o - -panfrost-$(CONFIG_DEBUG_FS) +=3D panfrost_debugfs.o + panfrost_dump.o \ + panfrost_sysfs.o =20 obj-$(CONFIG_DRM_PANFROST) +=3D panfrost.o diff --git a/drivers/gpu/drm/panfrost/panfrost_debugfs.c b/drivers/gpu/drm/= panfrost/panfrost_debugfs.c deleted file mode 100644 index 72d4286a6bf7..000000000000 --- a/drivers/gpu/drm/panfrost/panfrost_debugfs.c +++ /dev/null @@ -1,21 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* Copyright 2023 Collabora ltd. */ -/* Copyright 2023 Amazon.com, Inc. or its affiliates. */ - -#include -#include -#include -#include -#include - -#include "panfrost_device.h" -#include "panfrost_gpu.h" -#include "panfrost_debugfs.h" - -void panfrost_debugfs_init(struct drm_minor *minor) -{ - struct drm_device *dev =3D minor->dev; - struct panfrost_device *pfdev =3D platform_get_drvdata(to_platform_device= (dev->dev)); - - debugfs_create_atomic_t("profile", 0600, minor->debugfs_root, &pfdev->pro= file_mode); -} diff --git a/drivers/gpu/drm/panfrost/panfrost_debugfs.h b/drivers/gpu/drm/= panfrost/panfrost_debugfs.h deleted file mode 100644 index c5af5f35877f..000000000000 --- a/drivers/gpu/drm/panfrost/panfrost_debugfs.h +++ /dev/null @@ -1,14 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * Copyright 2023 Collabora ltd. - * Copyright 2023 Amazon.com, Inc. or its affiliates. - */ - -#ifndef PANFROST_DEBUGFS_H -#define PANFROST_DEBUGFS_H - -#ifdef CONFIG_DEBUG_FS -void panfrost_debugfs_init(struct drm_minor *minor); -#endif - -#endif /* PANFROST_DEBUGFS_H */ diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/p= anfrost/panfrost_device.h index 62f7e3527385..56c8e5551335 100644 --- a/drivers/gpu/drm/panfrost/panfrost_device.h +++ b/drivers/gpu/drm/panfrost/panfrost_device.h @@ -130,7 +130,10 @@ struct panfrost_device { struct list_head scheduled_jobs; =20 struct panfrost_perfcnt *perfcnt; - atomic_t profile_mode; + struct kobj_profiling { + struct kobject base; + atomic_t profile_mode; + } profiling; =20 struct mutex sched_lock; =20 diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panf= rost/panfrost_drv.c index a926d71e8131..6db1ea453514 100644 --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -20,7 +20,7 @@ #include "panfrost_job.h" #include "panfrost_gpu.h" #include "panfrost_perfcnt.h" -#include "panfrost_debugfs.h" +#include "panfrost_sysfs.h" =20 static bool unstable_ioctls; module_param_unsafe(unstable_ioctls, bool, 0600); @@ -600,10 +600,6 @@ static const struct drm_driver panfrost_drm_driver =3D= { =20 .gem_create_object =3D panfrost_gem_create_object, .gem_prime_import_sg_table =3D panfrost_gem_prime_import_sg_table, - -#ifdef CONFIG_DEBUG_FS - .debugfs_init =3D panfrost_debugfs_init, -#endif }; =20 static int panfrost_probe(struct platform_device *pdev) @@ -663,8 +659,14 @@ static int panfrost_probe(struct platform_device *pdev) if (err) goto err_out2; =20 + err =3D panfrost_sysfs_init(pfdev); + if (err) + goto err_out3; + return 0; =20 +err_out3: + panfrost_gem_shrinker_cleanup(ddev); err_out2: drm_dev_unregister(ddev); err_out1: @@ -681,6 +683,8 @@ static void panfrost_remove(struct platform_device *pde= v) struct panfrost_device *pfdev =3D platform_get_drvdata(pdev); struct drm_device *ddev =3D pfdev->ddev; =20 + panfrost_sysfs_cleanup(pfdev); + drm_dev_unregister(ddev); panfrost_gem_shrinker_cleanup(ddev); =20 diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panf= rost/panfrost_job.c index 0c2dbf6ef2a5..49413dfda2ea 100644 --- a/drivers/gpu/drm/panfrost/panfrost_job.c +++ b/drivers/gpu/drm/panfrost/panfrost_job.c @@ -243,7 +243,7 @@ static void panfrost_job_hw_submit(struct panfrost_job = *job, int js) subslot =3D panfrost_enqueue_job(pfdev, js, job); /* Don't queue the job if a reset is in progress */ if (!atomic_read(&pfdev->reset.pending)) { - if (atomic_read(&pfdev->profile_mode)) { + if (atomic_read(&pfdev->profiling.profile_mode)) { panfrost_cycle_counter_get(pfdev); job->is_profiled =3D true; job->start_time =3D ktime_get(); diff --git a/drivers/gpu/drm/panfrost/panfrost_sysfs.c b/drivers/gpu/drm/pa= nfrost/panfrost_sysfs.c new file mode 100644 index 000000000000..072d3bf349d2 --- /dev/null +++ b/drivers/gpu/drm/panfrost/panfrost_sysfs.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright 2023 Collabora ltd. */ +/* Copyright 2023 Amazon.com, Inc. or its affiliates. */ + +#include +#include +#include + +#include "panfrost_device.h" +#include "panfrost_gpu.h" +#include "panfrost_sysfs.h" + +static ssize_t +profiling_show(struct kobject *kobj, struct kobj_attribute *attr, char *bu= f) +{ + atomic_t *profile_mode =3D + &container_of(kobj, struct { + struct kobject base; + atomic_t profile_mode; }, + base)->profile_mode; + + return sysfs_emit(buf, "%d\n", atomic_read(profile_mode)); +} + +static ssize_t +profiling_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t count) +{ + atomic_t *profile_mode =3D + &container_of(kobj, struct { + struct kobject base; + atomic_t profile_mode; }, + base)->profile_mode; + int err, value; + + err =3D kstrtoint(buf, 0, &value); + if (err) + return err; + + atomic_set(profile_mode, !!value); + + return count; +} + +static const struct kobj_attribute profiling_status =3D +__ATTR(status, 0644, profiling_show, profiling_store); + +static const struct kobj_type kobj_profile_type =3D { + .sysfs_ops =3D &kobj_sysfs_ops, +}; + +int panfrost_sysfs_init(struct panfrost_device *pfdev) +{ + struct device *kdev =3D pfdev->ddev->primary->kdev; + int err; + + kobject_init(&pfdev->profiling.base, &kobj_profile_type); + + err =3D kobject_add(&pfdev->profiling.base, &kdev->kobj, "%s", "profiling= "); + if (err) + return err; + + err =3D sysfs_create_file(&pfdev->profiling.base, &profiling_status.attr); + if (err) + kobject_del(&pfdev->profiling.base); + + return err; +} + +void panfrost_sysfs_cleanup(struct panfrost_device *pfdev) +{ + sysfs_remove_file(&pfdev->profiling.base, &profiling_status.attr); + kobject_del(&pfdev->profiling.base); +} diff --git a/drivers/gpu/drm/panfrost/panfrost_sysfs.h b/drivers/gpu/drm/pa= nfrost/panfrost_sysfs.h new file mode 100644 index 000000000000..5fc9c8c1091a --- /dev/null +++ b/drivers/gpu/drm/panfrost/panfrost_sysfs.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright 2023 Collabora ltd. + * Copyright 2023 Amazon.com, Inc. or its affiliates. + */ + +#ifndef PANFROST_SYSFS_H +#define PANFROST_SYSFS_H + +struct panfrost_device; + +int panfrost_sysfs_init(struct panfrost_device *pfdev); +void panfrost_sysfs_cleanup(struct panfrost_device *pfdev); + +#endif /* PANFROST_SYSFS_H */ --=20 2.43.0