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

[Maciej Kwapulinski]

From: Tomasz Jankowski <tomasz1.jankow...@intel.com>

Signed-off-by: Tomasz Jankowski <tomasz1.jankow...@intel.com>
Tested-by: Savo Novakovic <savox.novako...@intel.com>
Co-developed-by: Jianxun Zhang <jianxun.zh...@linux.intel.com>
Signed-off-by: Jianxun Zhang <jianxun.zh...@linux.intel.com>
Co-developed-by: Maciej Kwapulinski <maciej.kwapulin...@linux.intel.com>
Signed-off-by: Maciej Kwapulinski <maciej.kwapulin...@linux.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