From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Zhangfei Gao <zhangfei.gao@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
linux-accelerators@lists.ozlabs.org,
linux-kernel@vger.kernel.org,
Kenneth Lee <liguozhu@hisilicon.com>,
Zaibo Xu <xuzaibo@huawei.com>,
Zhou Wang <wangzhou1@hisilicon.com>
Subject: Re: [PATCH 2/2] uacce: add uacce module
Date: Thu, 15 Aug 2019 16:20:21 +0200 [thread overview]
Message-ID: <20190815142021.GE23267@kroah.com> (raw)
In-Reply-To: <1565775265-21212-3-git-send-email-zhangfei.gao@linaro.org>
On Wed, Aug 14, 2019 at 05:34:25PM +0800, Zhangfei Gao wrote:
> +/* lock to protect all queues management */
> +static DECLARE_RWSEM(uacce_qs_lock);
> +#define uacce_qs_rlock() down_read(&uacce_qs_lock)
> +#define uacce_qs_runlock() up_read(&uacce_qs_lock)
> +#define uacce_qs_wlock() down_write(&uacce_qs_lock)
> +#define uacce_qs_wunlock() up_write(&uacce_qs_lock)
Do not define your own locking macros. That makes the code impossible
to review.
And are you _sure_ you need a rw lock? You have benchmarked where it
has a performance impact?
> +/**
> + * uacce_wake_up - Wake up the process who is waiting this queue
> + * @q the accelerator queue to wake up
> + */
> +void uacce_wake_up(struct uacce_queue *q)
> +{
> + dev_dbg(&q->uacce->dev, "wake up\n");
ftrace is your friend, no need for any such logging lines anywhere in
these files.
> + wake_up_interruptible(&q->wait);
> +}
> +EXPORT_SYMBOL_GPL(uacce_wake_up);
...
> +static struct attribute *uacce_dev_attrs[] = {
> + &dev_attr_id.attr,
> + &dev_attr_api.attr,
> + &dev_attr_node_id.attr,
> + &dev_attr_numa_distance.attr,
> + &dev_attr_flags.attr,
> + &dev_attr_available_instances.attr,
> + &dev_attr_algorithms.attr,
> + &dev_attr_qfrs_offset.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group uacce_dev_attr_group = {
> + .name = UACCE_DEV_ATTRS,
> + .attrs = uacce_dev_attrs,
> +};
Why is your attribute group in a subdirectory? Why not in the "normal"
class directory?
You are adding sysfs files to the kernel without any Documentation/ABI/
entries, which is a requirement. Please fix that up for the next time
you send these.
> +static const struct attribute_group *uacce_dev_attr_groups[] = {
> + &uacce_dev_attr_group,
> + NULL
> +};
> +
> +static int uacce_create_chrdev(struct uacce *uacce)
> +{
> + int ret;
> +
> + ret = idr_alloc(&uacce_idr, uacce, 0, 0, GFP_KERNEL);
> + if (ret < 0)
> + return ret;
> +
Shouldn't this function create the memory needed for this structure?
You are relying ont he caller to do it for you, why?
> + cdev_init(&uacce->cdev, &uacce_fops);
> + uacce->dev_id = ret;
> + uacce->cdev.owner = THIS_MODULE;
> + device_initialize(&uacce->dev);
> + uacce->dev.devt = MKDEV(MAJOR(uacce_devt), uacce->dev_id);
> + uacce->dev.class = uacce_class;
> + uacce->dev.groups = uacce_dev_attr_groups;
> + uacce->dev.parent = uacce->pdev;
> + dev_set_name(&uacce->dev, "%s-%d", uacce->drv_name, uacce->dev_id);
> + ret = cdev_device_add(&uacce->cdev, &uacce->dev);
> + if (ret)
> + goto err_with_idr;
> +
> + dev_dbg(&uacce->dev, "create uacce minior=%d\n", uacce->dev_id);
> + return 0;
> +
> +err_with_idr:
> + idr_remove(&uacce_idr, uacce->dev_id);
> + return ret;
> +}
> +
> +static void uacce_destroy_chrdev(struct uacce *uacce)
> +{
> + cdev_device_del(&uacce->cdev, &uacce->dev);
> + idr_remove(&uacce_idr, uacce->dev_id);
> +}
> +
> +static int uacce_default_get_available_instances(struct uacce *uacce)
> +{
> + return -1;
Do not make up error values, use the proper -EXXXX value instead.
> +}
> +
> +static int uacce_default_start_queue(struct uacce_queue *q)
> +{
> + dev_dbg(&q->uacce->dev, "fake start queue");
> + return 0;
Why even have this function if you do not do anything in it?
> +}
> +
> +static int uacce_dev_match(struct device *dev, void *data)
> +{
> + if (dev->parent == data)
> + return -EBUSY;
There should be in-kernel functions for this now, no need for you to
roll your own.
thanks,
greg k-h
next prev parent reply other threads:[~2019-08-15 14:20 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-14 9:34 [PATCH 0/2] A General Accelerator Framework, WarpDrive Zhangfei Gao
2019-08-14 9:34 ` [PATCH 1/2] uacce: Add documents for WarpDrive/uacce Zhangfei Gao
2019-08-14 9:34 ` [PATCH 2/2] uacce: add uacce module Zhangfei Gao
2019-08-15 14:12 ` Greg Kroah-Hartman
[not found] ` <5d5a6757.1c69fb81.e0678.2ab2SMTPIN_ADDED_BROKEN@mx.google.com>
2019-08-19 10:22 ` Greg Kroah-Hartman
2019-08-20 12:38 ` zhangfei
2019-08-20 14:31 ` Greg Kroah-Hartman
2019-08-15 14:13 ` Greg Kroah-Hartman
2019-08-20 13:08 ` zhangfei
2019-08-20 16:59 ` Greg Kroah-Hartman
[not found] ` <5d5cf0fc.1c69fb81.ec57f.b853SMTPIN_ADDED_BROKEN@mx.google.com>
2019-08-21 9:17 ` Greg Kroah-Hartman
2019-08-21 14:30 ` zhangfei
2019-08-21 16:05 ` Greg Kroah-Hartman
2019-08-26 4:10 ` Kenneth Lee
2019-08-26 4:29 ` Greg Kroah-Hartman
2019-08-27 11:42 ` Kenneth Lee
2019-08-27 18:48 ` Greg Kroah-Hartman
2019-08-15 14:20 ` Greg Kroah-Hartman [this message]
[not found] ` <5d5a6f5b.1c69fb81.9d35e.5303SMTPIN_ADDED_BROKEN@mx.google.com>
2019-08-19 10:24 ` Greg Kroah-Hartman
2019-08-20 12:36 ` zhangfei
2019-08-20 14:33 ` Greg Kroah-Hartman
2019-08-24 12:53 ` zhangfei
2019-08-24 15:40 ` Greg Kroah-Hartman
2019-08-15 16:54 ` Jonathan Cameron
2019-08-23 9:21 ` zhangfei
2019-08-23 16:36 ` Jonathan Cameron
2019-08-23 16:42 ` Jonathan Cameron
2019-08-15 17:04 ` [PATCH 0/2] A General Accelerator Framework, WarpDrive Jerome Glisse
2019-08-20 14:26 ` zhangfei
2019-08-26 4:14 ` Kenneth Lee
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