fb3f251037
This patch merges all of the IOMMU/SMMU, DMA mapping, fast, and lazy mapping changes from msm-4.19 into msm-lahaina. Change-Id: If7c1f641a8c836dbb799e2f3439f443ff299b299 Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (c) 2015-2016, 2018 The Linux Foundation. All rights reserved.
|
|
*/
|
|
|
|
#ifndef _LINUX_MSM_DMA_IOMMU_MAPPING_H
|
|
#define _LINUX_MSM_DMA_IOMMU_MAPPING_H
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/dma-buf.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/dma-mapping.h>
|
|
|
|
#if IS_ENABLED(CONFIG_QCOM_LAZY_MAPPING)
|
|
/*
|
|
* This function is not taking a reference to the dma_buf here. It is expected
|
|
* that clients hold reference to the dma_buf until they are done with mapping
|
|
* and unmapping.
|
|
*/
|
|
int msm_dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents,
|
|
enum dma_data_direction dir, struct dma_buf *dma_buf,
|
|
unsigned long attrs);
|
|
|
|
/*
|
|
* This function takes an extra reference to the dma_buf.
|
|
* What this means is that calling msm_dma_unmap_sg will not result in buffer's
|
|
* iommu mapping being removed, which means that subsequent calls to lazy map
|
|
* will simply re-use the existing iommu mapping.
|
|
* The iommu unmapping of the buffer will occur when the ION buffer is
|
|
* destroyed.
|
|
* Using lazy mapping can provide a performance benefit because subsequent
|
|
* mappings are faster.
|
|
*
|
|
* The limitation of using this API are that all subsequent iommu mappings
|
|
* must be the same as the original mapping, ie they must map the same part of
|
|
* the buffer with the same dma data direction. Also there can't be multiple
|
|
* mappings of different parts of the buffer.
|
|
*/
|
|
static inline int msm_dma_map_sg_lazy(struct device *dev,
|
|
struct scatterlist *sg, int nents,
|
|
enum dma_data_direction dir,
|
|
struct dma_buf *dma_buf)
|
|
{
|
|
return msm_dma_map_sg_attrs(dev, sg, nents, dir, dma_buf, 0);
|
|
}
|
|
|
|
static inline int msm_dma_map_sg(struct device *dev, struct scatterlist *sg,
|
|
int nents, enum dma_data_direction dir,
|
|
struct dma_buf *dma_buf)
|
|
{
|
|
unsigned long attrs;
|
|
|
|
attrs = DMA_ATTR_NO_DELAYED_UNMAP;
|
|
return msm_dma_map_sg_attrs(dev, sg, nents, dir, dma_buf, attrs);
|
|
}
|
|
|
|
void msm_dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sgl,
|
|
int nents, enum dma_data_direction dir,
|
|
struct dma_buf *dma_buf, unsigned long attrs);
|
|
|
|
int msm_dma_unmap_all_for_dev(struct device *dev);
|
|
|
|
/*
|
|
* Below is private function only to be called by framework (ION) and not by
|
|
* clients.
|
|
*/
|
|
void msm_dma_buf_freed(void *buffer);
|
|
|
|
#else /*CONFIG_QCOM_LAZY_MAPPING*/
|
|
|
|
static inline int msm_dma_map_sg_attrs(struct device *dev,
|
|
struct scatterlist *sg, int nents,
|
|
enum dma_data_direction dir, struct dma_buf *dma_buf,
|
|
unsigned long attrs)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline void
|
|
msm_dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sgl,
|
|
int nents, enum dma_data_direction dir,
|
|
struct dma_buf *dma_buf, unsigned long attrs)
|
|
{
|
|
}
|
|
|
|
static inline int msm_dma_map_sg_lazy(struct device *dev,
|
|
struct scatterlist *sg, int nents,
|
|
enum dma_data_direction dir,
|
|
struct dma_buf *dma_buf)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline int msm_dma_map_sg(struct device *dev, struct scatterlist *sg,
|
|
int nents, enum dma_data_direction dir,
|
|
struct dma_buf *dma_buf)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline int msm_dma_unmap_all_for_dev(struct device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void msm_dma_buf_freed(void *buffer) {}
|
|
#endif /*CONFIG_QCOM_LAZY_MAPPING*/
|
|
|
|
#endif
|