From nobody Fri Feb 13 04:38:42 2026 Received: from out-177.mta0.migadu.com (out-177.mta0.migadu.com [91.218.175.177]) (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 078DB63D5 for ; Mon, 3 Jun 2024 00:33:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.177 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717374806; cv=none; b=lQwg6vcUwnyKDWWt8+0hFfUH49VREK13JYb4FhWNiXGURXg8bB9WgzVtbpU6uL58qrXsvfYC06OQnijWVK5XqPMInD/l//P6BBoiKCvWihP6gBpqHHKhhEpWFDHpyJrWNqTVWlrNJJp/4pNSRN4rCHFca525zlujmB+hjm8j7ds= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717374806; c=relaxed/simple; bh=MbreANTvOFsf+HoMZMv881QbCHhV7LHQF9AJXemvdRM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aFwrGJArAt2W0n/FRwpysutzLDvb+aIFDZWtqoE3YAUJzb6gW180dysBxoAiDD7QAhiMcDGWmmHgZzDd8+GThwuI819jJ/CbVS+WKdZieo+uKrFF3ClC3nWZxCnKiMecdc4u6wOT1zA0oYDFr3IEu9JMJoqvRYM4ZLbuECpVPVs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=h9/irGBP; arc=none smtp.client-ip=91.218.175.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="h9/irGBP" X-Envelope-To: linux-fsdevel@vger.kernel.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1717374801; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qtDVS9A12/FhM6gLI1GwHXngLSArqAMBUGSjtT60l7Y=; b=h9/irGBPZpS9RHEtUgiTJNJaSvRPgN6nJTrpu0j6bdb35L0d1exKDknSJ8k4wJbNc2SO/S d4jzM7YVLiQa1bS20ok3j4tjM0kEsbo2oWdezuBzLqXltHouvdgqN82Pjvqo6orf1MOT+1 37IexeJNG/zfZ4kQykqf74E8mRdY+bw= X-Envelope-To: linux-kernel@vger.kernel.org X-Envelope-To: axboe@kernel.dk X-Envelope-To: kent.overstreet@linux.dev X-Envelope-To: brauner@kernel.org X-Envelope-To: viro@zeniv.linux.org.uk X-Envelope-To: bernd.schubert@fastmail.fm X-Envelope-To: linux-mm@kvack.org X-Envelope-To: josef@toxicpanda.com X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Kent Overstreet To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jens Axboe , Kent Overstreet , brauner@kernel.org, viro@zeniv.linux.org.uk, Bernd Schubert , linux-mm@kvack.org, Josef Bacik Subject: [PATCH 4/5] ringbuffer: Test device Date: Sun, 2 Jun 2024 20:33:01 -0400 Message-ID: <20240603003306.2030491-5-kent.overstreet@linux.dev> In-Reply-To: <20240603003306.2030491-1-kent.overstreet@linux.dev> References: <20240603003306.2030491-1-kent.overstreet@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" This adds /dev/ringbuffer-test, which supports reading and writing a sequence of integers, to test performance and correctness. Signed-off-by: Kent Overstreet --- fs/Makefile | 1 + fs/ringbuffer_test.c | 209 +++++++++++++++++++++++++++++++++++++++++++ lib/Kconfig.debug | 5 ++ 3 files changed, 215 insertions(+) create mode 100644 fs/ringbuffer_test.c diff --git a/fs/Makefile b/fs/Makefile index 48e54ac01fb1..91061f281f0a 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_EVENTFD) +=3D eventfd.o obj-$(CONFIG_USERFAULTFD) +=3D userfaultfd.o obj-$(CONFIG_AIO) +=3D aio.o obj-$(CONFIG_RINGBUFFER) +=3D ringbuffer.o +obj-$(CONFIG_RINGBUFFER_TEST) +=3D ringbuffer_test.o obj-$(CONFIG_FS_DAX) +=3D dax.o obj-$(CONFIG_FS_ENCRYPTION) +=3D crypto/ obj-$(CONFIG_FS_VERITY) +=3D verity/ diff --git a/fs/ringbuffer_test.c b/fs/ringbuffer_test.c new file mode 100644 index 000000000000..01aa9c55120d --- /dev/null +++ b/fs/ringbuffer_test.c @@ -0,0 +1,209 @@ +// SPDX-License-Identifier: GPL-2.0 + +#define pr_fmt(fmt) "%s() " fmt "\n", __func__ + +#include +#include +#include +#include +#include +#include + +struct ringbuffer_test_file { + struct ringbuffer_test_rw { + struct mutex lock; + struct ringbuffer *rb; + struct task_struct *thr; + } rw[2]; +}; + +#define BUF_NR 4 + +static int ringbuffer_test_writer(void *p) +{ + struct file *file =3D p; + struct ringbuffer_test_file *f =3D file->private_data; + struct ringbuffer *rb =3D f->rw[READ].rb; + u32 idx =3D 0; + u32 buf[BUF_NR]; + + while (!kthread_should_stop()) { + cond_resched(); + + struct kvec vec =3D { buf, sizeof(buf) }; + struct iov_iter iter; + iov_iter_kvec(&iter, ITER_SOURCE, &vec, 1, sizeof(buf)); + + for (unsigned i =3D 0; i < ARRAY_SIZE(buf); i++) + buf[i] =3D idx + i; + + ssize_t ret =3D ringbuffer_write_iter(rb, &iter, false); + if (ret < 0) + continue; + idx +=3D ret / sizeof(buf[0]); + } + + return 0; +} + +static int ringbuffer_test_reader(void *p) +{ + struct file *file =3D p; + struct ringbuffer_test_file *f =3D file->private_data; + struct ringbuffer *rb =3D f->rw[WRITE].rb; + u32 idx =3D 0; + u32 buf[BUF_NR]; + + while (!kthread_should_stop()) { + cond_resched(); + + struct kvec vec =3D { buf, sizeof(buf) }; + struct iov_iter iter; + iov_iter_kvec(&iter, ITER_DEST, &vec, 1, sizeof(buf)); + + ssize_t ret =3D ringbuffer_read_iter(rb, &iter, false); + if (ret < 0) + continue; + + unsigned nr =3D ret / sizeof(buf[0]); + for (unsigned i =3D 0; i < nr; i++) + if (buf[i] !=3D idx + i) + pr_err("read wrong data"); + idx +=3D ret / sizeof(buf[0]); + } + + return 0; +} + +static void ringbuffer_test_free(struct ringbuffer_test_file *f) +{ + for (unsigned i =3D 0; i < ARRAY_SIZE(f->rw); i++) + if (!IS_ERR_OR_NULL(f->rw[i].thr)) + kthread_stop_put(f->rw[i].thr); + for (unsigned i =3D 0; i < ARRAY_SIZE(f->rw); i++) + if (!IS_ERR_OR_NULL(f->rw[i].rb)) + ringbuffer_free(f->rw[i].rb); + kfree(f); +} + +static int ringbuffer_test_open(struct inode *inode, struct file *file) +{ + static const char * const rw_str[] =3D { "reader", "writer" }; + int ret =3D 0; + + struct ringbuffer_test_file *f =3D kzalloc(sizeof(*f), GFP_KERNEL); + if (!f) + return -ENOMEM; + + for (struct ringbuffer_test_rw *i =3D f->rw; + i < f->rw + ARRAY_SIZE(f->rw); + i++) { + unsigned idx =3D i - f->rw; + + mutex_init(&i->lock); + + i->rb =3D ringbuffer_alloc(PAGE_SIZE * 4); + ret =3D PTR_ERR_OR_ZERO(i->rb); + if (ret) + goto err; + + i->thr =3D kthread_create(idx =3D=3D READ + ? ringbuffer_test_reader + : ringbuffer_test_writer, + file, "ringbuffer_%s", rw_str[idx]); + ret =3D PTR_ERR_OR_ZERO(i->thr); + if (ret) + goto err; + get_task_struct(i->thr); + } + + file->private_data =3D f; + wake_up_process(f->rw[0].thr); + wake_up_process(f->rw[1].thr); + return 0; +err: + ringbuffer_test_free(f); + return ret; +} + +static int ringbuffer_test_release(struct inode *inode, struct file *file) +{ + ringbuffer_test_free(file->private_data); + return 0; +} + +static ssize_t ringbuffer_test_read_iter(struct kiocb *iocb, struct iov_it= er *iter) +{ + struct file *file =3D iocb->ki_filp; + struct ringbuffer_test_file *f =3D file->private_data; + struct ringbuffer_test_rw *i =3D &f->rw[READ]; + + ssize_t ret =3D mutex_lock_interruptible(&i->lock); + if (ret) + return ret; + + ret =3D ringbuffer_read_iter(i->rb, iter, file->f_flags & O_NONBLOCK); + mutex_unlock(&i->lock); + return ret; +} + +static ssize_t ringbuffer_test_write_iter(struct kiocb *iocb, struct iov_i= ter *iter) +{ + struct file *file =3D iocb->ki_filp; + struct ringbuffer_test_file *f =3D file->private_data; + struct ringbuffer_test_rw *i =3D &f->rw[WRITE]; + + ssize_t ret =3D mutex_lock_interruptible(&i->lock); + if (ret) + return ret; + + ret =3D ringbuffer_write_iter(i->rb, iter, file->f_flags & O_NONBLOCK); + mutex_unlock(&i->lock); + return ret; +} + +static struct ringbuffer *ringbuffer_test_ringbuffer(struct file *file, in= t rw) +{ + struct ringbuffer_test_file *i =3D file->private_data; + + BUG_ON(rw > WRITE); + + return i->rw[rw].rb; +} + +static const struct file_operations ringbuffer_fops =3D { + .owner =3D THIS_MODULE, + .read_iter =3D ringbuffer_test_read_iter, + .write_iter =3D ringbuffer_test_write_iter, + .ringbuffer =3D ringbuffer_test_ringbuffer, + .open =3D ringbuffer_test_open, + .release =3D ringbuffer_test_release, +}; + +static int __init ringbuffer_test_init(void) +{ + int ringbuffer_major =3D register_chrdev(0, "ringbuffer-test", &ringbuffe= r_fops); + if (ringbuffer_major < 0) + return ringbuffer_major; + + static const struct class ringbuffer_class =3D { .name =3D "ringbuffer_te= st" }; + int ret =3D class_register(&ringbuffer_class); + if (ret) + goto major_out; + + struct device *ringbuffer_device =3D device_create(&ringbuffer_class, NUL= L, + MKDEV(ringbuffer_major, 0), + NULL, "ringbuffer-test"); + ret =3D PTR_ERR_OR_ZERO(ringbuffer_device); + if (ret) + goto class_out; + + return 0; + +class_out: + class_unregister(&ringbuffer_class); +major_out: + unregister_chrdev(ringbuffer_major, "ringbuffer-test"); + return ret; +} +__initcall(ringbuffer_test_init); diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 59b6765d86b8..bb16762af575 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2957,6 +2957,11 @@ config TEST_OBJPOOL =20 If unsure, say N. =20 +config RINGBUFFER_TEST + bool "Test driver for sys_ringbuffer" + default n + depends on RINGBUFFER + endif # RUNTIME_TESTING_MENU =20 config ARCH_USE_MEMTEST --=20 2.45.1