Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / dca / dca-sysfs.c

diff --git a/kernel/drivers/dca/dca-sysfs.c b/kernel/drivers/dca/dca-sysfs.c
new file mode 100644 (file)
index 0000000..126cf29
--- /dev/null
+++ b/kernel/drivers/dca/dca-sysfs.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called COPYING.
+ */
+
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/device.h>
+#include <linux/idr.h>
+#include <linux/kdev_t.h>
+#include <linux/err.h>
+#include <linux/dca.h>
+#include <linux/gfp.h>
+#include <linux/export.h>
+
+static struct class *dca_class;
+static struct idr dca_idr;
+static spinlock_t dca_idr_lock;
+
+int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot)
+{
+       struct device *cd;
+       static int req_count;
+
+       cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), NULL,
+                          "requester%d", req_count++);
+       if (IS_ERR(cd))
+               return PTR_ERR(cd);
+       return 0;
+}
+
+void dca_sysfs_remove_req(struct dca_provider *dca, int slot)
+{
+       device_destroy(dca_class, MKDEV(0, slot + 1));
+}
+
+int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
+{
+       struct device *cd;
+       int ret;
+
+       idr_preload(GFP_KERNEL);
+       spin_lock(&dca_idr_lock);
+
+       ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT);
+       if (ret >= 0)
+               dca->id = ret;
+
+       spin_unlock(&dca_idr_lock);
+       idr_preload_end();
+       if (ret < 0)
+               return ret;
+
+       cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id);
+       if (IS_ERR(cd)) {
+               spin_lock(&dca_idr_lock);
+               idr_remove(&dca_idr, dca->id);
+               spin_unlock(&dca_idr_lock);
+               return PTR_ERR(cd);
+       }
+       dca->cd = cd;
+       return 0;
+}
+
+void dca_sysfs_remove_provider(struct dca_provider *dca)
+{
+       device_unregister(dca->cd);
+       dca->cd = NULL;
+       spin_lock(&dca_idr_lock);
+       idr_remove(&dca_idr, dca->id);
+       spin_unlock(&dca_idr_lock);
+}
+
+int __init dca_sysfs_init(void)
+{
+       idr_init(&dca_idr);
+       spin_lock_init(&dca_idr_lock);
+
+       dca_class = class_create(THIS_MODULE, "dca");
+       if (IS_ERR(dca_class)) {
+               idr_destroy(&dca_idr);
+               return PTR_ERR(dca_class);
+       }
+       return 0;
+}
+
+void __exit dca_sysfs_exit(void)
+{
+       class_destroy(dca_class);
+       idr_destroy(&dca_idr);
+}
+