// SPDX-License-Identifier: GPL-2.0-only
/*
* IBM Accelerator Family 'GenWQE'
*
* (C) Copyright IBM Corp. 2013
*
* Author: Frank Haverkamp <haver@linux.vnet.ibm.com>
* Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com>
* Author: Michael Jung <mijung@gmx.net>
* Author: Michael Ruettger <michael@ibmra.de>
*/
/*
* Character device representation of the GenWQE device. This allows
* user-space applications to communicate with the card.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/sched/signal.h>
#include <linux/wait.h>
#include <linux/delay.h>
#include <linux/atomic.h>
#include "card_base.h"
#include "card_ddcb.h"
static int genwqe_open_files(struct genwqe_dev *cd)
{
int rc;
unsigned long flags;
spin_lock_irqsave(&cd->file_lock, flags);
rc = list_empty(&cd->file_list);
spin_unlock_irqrestore(&cd->file_lock, flags);
return !rc;
}
static void genwqe_add_file(struct genwqe_dev *cd, struct genwqe_file *cfile)
{
unsigned long flags;
cfile->opener = get_pid(task_tgid(current));
spin_lock_irqsave(&cd->file_lock, flags);
list_add(&cfile->list, &cd->file_list);
spin_unlock_irqrestore(&cd->file_lock, flags);
}
static int genwqe_del_file(struct genwqe_dev *cd, struct genwqe_file *cfile)
{
unsigned long flags;
spin_lock_irqsave(&cd->file_lock, flags);
list_del(&cfile->list);
spin_unlock_irqrestore(&cd->file_lock, flags);
put_pid(cfile->opener);
return 0;
}
static void genwqe_add_pin(struct genwqe_file *cfile, struct dma_mapping *m)
{
unsigned long flags;
spin_lock_irqsave(&cfile->pin_lock, flags);
list_add(&m->pin_list, &cfile->pin_list);
spin_unlock_irqrestore(&cfile->pin_lock, flags);
}
static int 