Restructure kernel driver source tree

As a first step to have a clearer separation of the different parts of
the kernel driver, the source files have been placed into separate
directories according to their purpose and the different parts are only
allowed to use headers from another part in the include folder.

Files have been renamed accordingly to namespace them by their purpose.

Change-Id: I75e09ebf0002c99a22b6d4b09d34504d186c32b3
Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>

1 files changed, 215 insertions, 0 deletions

diff --git a/kernel/common/ethosu_buffer.c b/kernel/common/ethosu_buffer.c
new file mode 100644
index 0000000..cf41b8d
--- /dev/null
+++ b/kernel/common/ethosu_buffer.c
@@ -0,0 +1,215 @@
+/*
+ * SPDX-FileCopyrightText: Copyright 2020-2024 Arm Limited and/or its affiliates <open-source-office@arm.com>
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ * This program is free software and is provided to you under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation, and any use by you of this program is subject to the terms
+ * of such GNU licence.
+ *
+ * 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, you can access it online at
+ * http://www.gnu.org/licenses/gpl-2.0.html.
+ */
+
+/****************************************************************************
+ * Includes
+ ****************************************************************************/
+
+#include <common/ethosu_buffer.h>
+
+#include <common/ethosu_device.h>
+#include <common/ethosu_dma_mem.h>
+#include <uapi/ethosu.h>
+
+#include <linux/anon_inodes.h>
+#include <linux/dma-mapping.h>
+#include <linux/of_address.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/remoteproc.h>
+#include <linux/uaccess.h>
+
+/****************************************************************************
+ * Variables
+ ****************************************************************************/
+
+static int ethosu_buffer_release(struct inode *inode,
+				 struct file *file);
+
+static int ethosu_buffer_mmap(struct file *file,
+			      struct vm_area_struct *vma);
+
+static loff_t ethosu_buffer_llseek(struct file *file,
+				   loff_t offset,
+				   int whence);
+
+static const struct file_operations ethosu_buffer_fops = {
+	.release = &ethosu_buffer_release,
+	.mmap    = &ethosu_buffer_mmap,
+	.llseek  = &ethosu_buffer_llseek,
+};
+
+/****************************************************************************
+ * Functions
+ ****************************************************************************/
+
+static bool ethosu_buffer_verify(struct file *file)
+{
+	return file->f_op == &ethosu_buffer_fops;
+}
+
+static void ethosu_buffer_destroy(struct kref *kref)
+{
+	struct ethosu_buffer *buf =
+		container_of(kref, struct ethosu_buffer, kref);
+	struct device *dev = buf->dev;
+
+	dev_dbg(dev, "Buffer destroy. buf=0x%pK", buf);
+
+	ethosu_dma_mem_free(&buf->dma_mem);
+
+	memset(buf, 0, sizeof(*buf));
+	devm_kfree(dev, buf);
+}
+
+static int ethosu_buffer_release(struct inode *inode,
+				 struct file *file)
+{
+	struct ethosu_buffer *buf = file->private_data;
+	struct device *dev = buf->dev;
+
+	dev_dbg(dev, "Buffer release. file=0x%pK, buf=0x%pK\n",
+		file, buf);
+
+	ethosu_buffer_put(buf);
+
+	return 0;
+}
+
+static int ethosu_buffer_mmap(struct file *file,
+			      struct vm_area_struct *vma)
+{
+	struct ethosu_buffer *buf = file->private_data;
+	struct device *dev = buf->dev;
+	int ret;
+
+	dev_dbg(dev, "Buffer mmap. file=0x%pK, buf=0x%pK\n",
+		file, buf);
+
+	ret = dma_mmap_coherent(dev, vma, buf->dma_mem->cpu_addr,
+				buf->dma_mem->dma_addr, buf->dma_mem->size);
+
+	return ret;
+}
+
+static loff_t ethosu_buffer_llseek(struct file *file,
+				   loff_t offset,
+				   int whence)
+{
+	struct ethosu_buffer *buf = file->private_data;
+
+	if (offset != 0)
+		return -EINVAL;
+
+	/*
+	 * SEEK_END and SEEK_SET is supported with a zero offset to allow buffer
+	 * size discovery using seek functions e.g.
+	 * size = lseek(buf_fd, 0, SEEK_END);
+	 * lseek(buf_fd, 0, SEEK_SET);
+	 */
+	switch (whence) {
+	case SEEK_END:
+		return buf->dma_mem->size;
+	case SEEK_SET:
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+int ethosu_buffer_create(struct device *dev,
+			 size_t size)
+{
+	struct ethosu_buffer *buf;
+	int ret = -ENOMEM;
+
+	if (!size)
+		return -EINVAL;
+
+	buf = devm_kzalloc(dev, sizeof(*buf), GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	buf->dev = dev;
+	kref_init(&buf->kref);
+
+	buf->dma_mem = ethosu_dma_mem_alloc(dev, size);
+	if (IS_ERR(buf->dma_mem)) {
+		ret = PTR_ERR(buf->dma_mem);
+		goto free_buf;
+	}
+
+	ret = anon_inode_getfd("ethosu-buffer", &ethosu_buffer_fops, buf,
+			       O_RDWR | O_CLOEXEC);
+	if (ret < 0)
+		goto free_dma;
+
+	buf->file = fget(ret);
+	buf->file->f_mode |= FMODE_LSEEK;
+
+	fput(buf->file);
+
+	dev_dbg(dev,
+		"Buffer create. file=0x%pK, fd=%d, buf=0x%pK, size=%zu, cpu_addr=0x%pK, dma_addr=0x%llx, phys_addr=0x%llx\n",
+		buf->file, ret, buf, size, buf->dma_mem->cpu_addr,
+		buf->dma_mem->dma_addr, virt_to_phys(buf->dma_mem->cpu_addr));
+
+	return ret;
+
+free_dma:
+	ethosu_dma_mem_free(&buf->dma_mem);
+
+free_buf:
+	memset(buf, 0, sizeof(*buf));
+	devm_kfree(dev, buf);
+
+	return ret;
+}
+
+struct ethosu_buffer *ethosu_buffer_get_from_fd(int fd)
+{
+	struct ethosu_buffer *buf;
+	struct file *file;
+
+	file = fget(fd);
+	if (!file)
+		return ERR_PTR(-EINVAL);
+
+	if (!ethosu_buffer_verify(file)) {
+		fput(file);
+
+		return ERR_PTR(-EINVAL);
+	}
+
+	buf = file->private_data;
+	ethosu_buffer_get(buf);
+	fput(file);
+
+	return buf;
+}
+
+void ethosu_buffer_get(struct ethosu_buffer *buf)
+{
+	kref_get(&buf->kref);
+}
+
+void ethosu_buffer_put(struct ethosu_buffer *buf)
+{
+	kref_put(&buf->kref, ethosu_buffer_destroy);
+}