linux-kernel - [PATCH v2 13/13] intel_gna: add file operations to a 'misc' device

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Message-Id: <20210324183610.4574-14-maciej.kwapulinski@linux.intel.com>
Date:   Wed, 24 Mar 2021 19:36:10 +0100
From:   Maciej Kwapulinski <maciej.kwapulinski@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Maciej Kwapulinski <maciej.kwapulinski@...ux.intel.com>,
        Tomasz Jankowski <tomasz1.jankowski@...el.com>,
        Savo Novakovic <savox.novakovic@...el.com>,
        Jianxun Zhang <jianxun.zhang@...ux.intel.com>
Subject: [PATCH v2 13/13] intel_gna: add file operations to a 'misc' device

From: Tomasz Jankowski <tomasz1.jankowski@...el.com>

Signed-off-by: Tomasz Jankowski <tomasz1.jankowski@...el.com>
Tested-by: Savo Novakovic <savox.novakovic@...el.com>
Co-developed-by: Jianxun Zhang <jianxun.zhang@...ux.intel.com>
Signed-off-by: Jianxun Zhang <jianxun.zhang@...ux.intel.com>
Co-developed-by: Maciej Kwapulinski <maciej.kwapulinski@...ux.intel.com>
Signed-off-by: Maciej Kwapulinski <maciej.kwapulinski@...ux.intel.com>
---
 drivers/misc/intel/gna/gna_device.c | 60 ++++++++++++++++++++++++++++-
 1 file changed, 59 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/intel/gna/gna_device.c b/drivers/misc/intel/gna/gna_device.c
index 3f7f4c07d1a1..3f74a0a3bd30 100644
--- a/drivers/misc/intel/gna/gna_device.c
+++ b/drivers/misc/intel/gna/gna_device.c
@@ -93,12 +93,70 @@ MODULE_DEVICE_TABLE(pci, gna_pci_ids);
 
 static int gna_open(struct inode *inode, struct file *f)
 {
-	return -EPERM;
+	struct gna_file_private *file_priv;
+	struct gna_private *gna_priv;
+
+	gna_priv = container_of(f->private_data, struct gna_private, misc);
+
+	file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
+	if (!file_priv)
+		return -ENOMEM;
+
+	file_priv->fd = f;
+	file_priv->gna_priv = gna_priv;
+
+	mutex_init(&file_priv->memlist_lock);
+	INIT_LIST_HEAD(&file_priv->memory_list);
+
+	mutex_lock(&gna_priv->flist_lock);
+	list_add_tail(&file_priv->flist, &gna_priv->file_list);
+	mutex_unlock(&gna_priv->flist_lock);
+
+	f->private_data = file_priv;
+
+	return 0;
+}
+
+static int gna_release(struct inode *inode, struct file *f)
+{
+	struct gna_file_private *iter_file, *temp_file;
+	struct gna_memory_object *iter_mo, *temp_mo;
+	struct gna_file_private *file_priv;
+	struct gna_private *gna_priv;
+
+	/* free all memory objects created by that file */
+	file_priv = (struct gna_file_private *)f->private_data;
+	gna_priv = file_priv->gna_priv;
+
+	mutex_lock(&file_priv->memlist_lock);
+	list_for_each_entry_safe(iter_mo, temp_mo, &file_priv->memory_list, file_mem_list) {
+		queue_work(gna_priv->request_wq, &iter_mo->work);
+		wait_event(iter_mo->waitq, true);
+		gna_memory_free(gna_priv, iter_mo);
+	}
+	mutex_unlock(&file_priv->memlist_lock);
+
+	gna_delete_file_requests(f, gna_priv);
+
+	mutex_lock(&gna_priv->flist_lock);
+	list_for_each_entry_safe(iter_file, temp_file, &gna_priv->file_list, flist) {
+		if (iter_file->fd == f) {
+			list_del(&iter_file->flist);
+			f->private_data = NULL;
+			kfree(iter_file);
+			break;
+		}
+	}
+	mutex_unlock(&gna_priv->flist_lock);
+
+	return 0;
 }
 
 static const struct file_operations gna_file_ops = {
 	.owner		=	THIS_MODULE,
 	.open		=	gna_open,
+	.release	=	gna_release,
+	.unlocked_ioctl =	gna_ioctl,
 };
 
 static void gna_dev_release(struct gna_private *gna_priv)
-- 
2.28.0