sound/soc/samsung/abox/abox_mmapfd.c

/* sound/soc/samsung/abox/abox_mmap_fd.c
 *
 * ALSA SoC - Samsung Abox MMAP Exclusive mode driver
 *
 * Copyright (c) 2018 Samsung Electronics Co. Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
/* #define DEBUG */
#include <sound/samsung/abox.h>
#include <sound/sounddev_abox.h>

#include <linux/dma-buf.h>
#include <linux/dma-buf-container.h>
#include <linux/ion_exynos.h>

#include "../../../../drivers/iommu/exynos-iommu.h"
#include "../../../../drivers/staging/android/uapi/ion.h"

#include "abox.h"

int abox_mmap_fd(struct abox_platform_data *data,
		struct snd_pcm_mmap_fd *mmap_fd)
{
	struct device *dev = &data->pdev->dev;
	int id = data->id;
	struct abox_ion_buf *buf = &data->ion_buf;
	struct dma_buf *temp_buf;
	int ret = 0;

	dev_dbg(dev, "%s id(%d)\n", __func__, id);

	if (buf->fd >= 0) {
		mmap_fd->dir = SNDRV_PCM_STREAM_PLAYBACK;
		mmap_fd->size = buf->size;
		mmap_fd->actual_size = buf->size;
		mmap_fd->fd = buf->fd;
	} else {
		mmap_fd->fd = dma_buf_fd(buf->dma_buf, O_CLOEXEC);
		if (mmap_fd->fd >= 0) {
			mmap_fd->dir = SNDRV_PCM_STREAM_PLAYBACK;
			mmap_fd->size = buf->size;
			mmap_fd->actual_size = buf->size;
		} else {
			ret = -EFAULT;
			dev_err(dev, "%s dma_buf_fd is failed\n", __func__);
			dma_buf_put(buf->dma_buf);

			goto error_get_fd;
		}

		buf->fd = mmap_fd->fd;
		dev_dbg(dev, "%s fd(%d)\n", __func__, buf->fd);
		temp_buf = dma_buf_get(buf->fd);
		data->mmap_fd_state = true;

		dev_dbg(dev, "%s-(%p)(%p)\n", __func__, buf->dma_buf, temp_buf);
	}
	dev_info(dev, "%s id(%d) fd(%d)\n", __func__, id, buf->fd);

error_get_fd:
	return ret;
}

int abox_ion_alloc(struct abox_platform_data *data,
		struct abox_ion_buf *buf,
		unsigned long iova,
		size_t size,
		size_t align)
{
	struct device *dev = &data->pdev->dev;
	struct device *dev_abox = &data->abox_data->pdev->dev;

	/* const char *heapname = "crypto_heap"; */
	const char *heapname = "ion_system_heap";
	int ret = 0;

	if (!buf)
		return -ENOMEM;

	size = PAGE_ALIGN(size);

	buf->dma_buf = ion_alloc_dmabuf(heapname, size, ION_FLAG_SYNC_FORCE);
	if (IS_ERR(buf->dma_buf)) {
		ret = -ENOMEM;
		goto error_alloc;
	}

	buf->attachment = dma_buf_attach(buf->dma_buf, dev_abox);
	if (IS_ERR(buf->attachment)) {
		ret = -ENOMEM;
		goto error_attach;
	}

	buf->sgt = dma_buf_map_attachment(
				buf->attachment, DMA_BIDIRECTIONAL);
	if (IS_ERR(buf->sgt)) {
		ret = -ENOMEM;
		goto error_map_dmabuf;
	}

	if (!buf->kva)
		buf->kva = dma_buf_vmap(buf->dma_buf);

	if (IS_ERR_OR_NULL(buf->kva)) {
		ret = -ENOMEM;
		goto error_dma_buf_vmap;
	}

	buf->size = size;
	buf->iova = iova;
	buf->direction = DMA_BIDIRECTIONAL;

	ret = abox_iommu_map_sg(&data->abox_data->pdev->dev,
			buf->iova,
			buf->sgt->sgl,
			buf->sgt->nents,
			DMA_BIDIRECTIONAL,
			buf->size,
			buf->kva);

	if (ret < 0) {
		dev_err(dev, "Failed to iommu_map(%#lx): %d\n",
				buf->iova, ret);

		goto error_iommu_map_sg;
	}

	return ret;

error_iommu_map_sg:
	dma_buf_vunmap(buf->dma_buf, buf->kva);
error_dma_buf_vmap:
	dma_buf_unmap_attachment(buf->attachment, buf->sgt,
				DMA_BIDIRECTIONAL);
error_map_dmabuf:
	dma_buf_detach(buf->dma_buf, buf->attachment);
error_attach:
	dma_buf_put(buf->dma_buf);
error_alloc:

	dev_err(dev, "%s: Error occured while allocating\n", __func__);
	return ret;
}

int abox_ion_free(struct abox_platform_data *data)
{
	struct device *dev = &data->pdev->dev;

	int ret = 0;

	ret = abox_iommu_unmap(&data->abox_data->pdev->dev,
			data->ion_buf.iova);

	if (ret < 0)
		dev_err(dev, "Failed to iommu_unmap: %d\n", ret);

	if (data->ion_buf.kva) {
		dma_buf_vunmap(data->ion_buf.dma_buf,
				data->ion_buf.kva);

		if (data->mmap_fd_state == true)
			dma_buf_put(data->ion_buf.dma_buf);
	}

	dma_buf_unmap_attachment(data->ion_buf.attachment,
			data->ion_buf.sgt,
			DMA_BIDIRECTIONAL);
	dma_buf_detach(data->ion_buf.dma_buf,
			data->ion_buf.attachment);
	dma_buf_put(data->ion_buf.dma_buf);

	return ret;
}