From: Jiho Chu <jiho.chu@samsung.com>
To: Oded Gabbay <ogabbay@kernel.org>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>,
Jeffrey Hugo <quic_jhugo@quicinc.com>,
Jason Gunthorpe <jgg@nvidia.com>, Arnd Bergmann <arnd@arndb.de>,
Thomas Zimmermann <tzimmermann@suse.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
Yuji Ishikawa <yuji2.ishikawa@toshiba.co.jp>,
Jagan Teki <jagan@amarulasolutions.com>,
John Hubbard <jhubbard@nvidia.com>,
Alex Deucher <alexander.deucher@amd.com>,
Christoph Hellwig <hch@infradead.org>,
Maciej Kwapulinski <maciej.kwapulinski@linux.intel.com>,
Kevin Hilman <khilman@baylibre.com>
Subject: Re: [RFC PATCH v2 2/3] accel: add dedicated minor for accelerator devices
Date: Thu, 3 Nov 2022 14:25:54 +0900 [thread overview]
Message-ID: <20221103142554.6310a60f0f6dad1a59fa7644@samsung.com> (raw)
In-Reply-To: <20221102203405.1797491-3-ogabbay@kernel.org>
On Wed, 2 Nov 2022 22:34:04 +0200
Oded Gabbay <ogabbay@kernel.org> wrote:
> +/**
> + * accel_open - open method for ACCEL file
> + * @inode: device inode
> + * @filp: file pointer.
> + *
> + * This function must be used by drivers as their &file_operations.open method.
> + * It looks up the correct ACCEL device and instantiates all the per-file
> + * resources for it. It also calls the &drm_driver.open driver callback.
> + *
> + * Return: 0 on success or negative errno value on failure.
> + */
> +int accel_open(struct inode *inode, struct file *filp)
> +{
> + struct drm_device *dev;
> + struct drm_minor *minor;
> + int retcode;
> +
> + minor = accel_minor_acquire(iminor(inode));
> + if (IS_ERR(minor))
> + return PTR_ERR(minor);
> +
> + dev = minor->dev;
> +
> + atomic_fetch_inc(&dev->open_count);
> +
Hi,
It needs to consider drm_global_mutex to access open_count.
please check doxy of open_count.
> + /* share address_space across all char-devs of a single device */
> + filp->f_mapping = dev->anon_inode->i_mapping;
> +
> + retcode = drm_open_helper(filp, minor);
> + if (retcode)
> + goto err_undo;
> +
> + return 0;
> +
> +err_undo:
> + atomic_dec(&dev->open_count);
> + accel_minor_release(minor);
> + return retcode;
> +}
> +EXPORT_SYMBOL_GPL(accel_open);
> +
> static int accel_stub_open(struct inode *inode, struct file *filp)
> {
> - DRM_DEBUG("Operation not supported");
> + const struct file_operations *new_fops;
> + struct drm_minor *minor;
> + int err;
> +
> + DRM_DEBUG("\n");
It seems useless.
Thanks.
Jiho Chu
next prev parent reply other threads:[~2022-11-03 5:26 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-02 20:34 [RFC PATCH v2 0/3] new subsystem for compute accelerator devices Oded Gabbay
2022-11-02 20:34 ` [RFC PATCH v2 1/3] drivers/accel: define kconfig and register a new major Oded Gabbay
2022-11-02 21:04 ` Jeffrey Hugo
2022-11-03 13:28 ` Oded Gabbay
2022-11-02 22:58 ` Randy Dunlap
2022-11-03 13:29 ` Oded Gabbay
2022-11-03 0:32 ` Greg Kroah-Hartman
2022-11-03 13:31 ` Oded Gabbay
2022-11-03 20:39 ` Oded Gabbay
2022-11-03 23:01 ` Randy Dunlap
2022-11-04 7:23 ` Stanislaw Gruszka
2022-11-07 12:56 ` Jason Gunthorpe
2022-11-07 13:01 ` Oded Gabbay
2022-11-07 13:10 ` Jason Gunthorpe
2022-11-07 13:25 ` Stanislaw Gruszka
2022-11-07 14:02 ` Oded Gabbay
2022-11-07 14:10 ` Jason Gunthorpe
2022-11-07 15:53 ` Oded Gabbay
2022-11-07 16:30 ` Jason Gunthorpe
2022-11-07 19:27 ` Oded Gabbay
2022-11-07 20:33 ` Dave Airlie
2022-11-08 12:28 ` Jason Gunthorpe
2022-11-09 7:22 ` Dave Airlie
2022-11-07 20:18 ` Dave Airlie
2022-11-02 20:34 ` [RFC PATCH v2 2/3] accel: add dedicated minor for accelerator devices Oded Gabbay
2022-11-02 21:17 ` Jeffrey Hugo
2022-11-06 10:51 ` Oded Gabbay
2022-11-03 5:25 ` Jiho Chu [this message]
2022-11-06 10:54 ` Oded Gabbay
2022-11-06 14:15 ` Oded Gabbay
2022-11-02 20:34 ` [RFC PATCH v2 3/3] drm: initialize accel framework Oded Gabbay
2022-11-02 21:30 ` Jeffrey Hugo
2022-11-06 10:55 ` Oded Gabbay
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