[PATCH v1 3/4] staging: media: tegra-vde: Add IOMMU support

Hans Verkuil hverkuil at xs4all.nl
Mon Jun 17 13:31:00 UTC 2019


On 6/2/19 11:37 PM, Dmitry Osipenko wrote:
> All Tegra's could provide memory isolation for the video decoder
> hardware using IOMMU, it is also required for Tegra30+ in order
> to handle sparse dmabuf's which GPU exports in a default kernel
> configuration.
> 
> Inspired-by: Thierry Reding <thierry.reding at gmail.com>
> Signed-off-by: Dmitry Osipenko <digetx at gmail.com>
> ---
>  drivers/staging/media/tegra-vde/Kconfig       |   1 +
>  drivers/staging/media/tegra-vde/Makefile      |   1 +
>  drivers/staging/media/tegra-vde/iommu.c       | 148 ++++++++++++++
>  drivers/staging/media/tegra-vde/trace.h       |   1 +
>  .../media/tegra-vde/{tegra-vde.c => vde.c}    | 188 +++++++++---------
>  drivers/staging/media/tegra-vde/vde.h         |  89 +++++++++
>  6 files changed, 335 insertions(+), 93 deletions(-)
>  create mode 100644 drivers/staging/media/tegra-vde/iommu.c
>  rename drivers/staging/media/tegra-vde/{tegra-vde.c => vde.c} (91%)
>  create mode 100644 drivers/staging/media/tegra-vde/vde.h
> 
> diff --git a/drivers/staging/media/tegra-vde/Kconfig b/drivers/staging/media/tegra-vde/Kconfig
> index ff8e846cd15d..2e7f644ae591 100644
> --- a/drivers/staging/media/tegra-vde/Kconfig
> +++ b/drivers/staging/media/tegra-vde/Kconfig
> @@ -3,6 +3,7 @@ config TEGRA_VDE
>  	tristate "NVIDIA Tegra Video Decoder Engine driver"
>  	depends on ARCH_TEGRA || COMPILE_TEST
>  	select DMA_SHARED_BUFFER
> +	select IOMMU_IOVA if IOMMU_SUPPORT
>  	select SRAM
>  	help
>  	    Say Y here to enable support for the NVIDIA Tegra video decoder
> diff --git a/drivers/staging/media/tegra-vde/Makefile b/drivers/staging/media/tegra-vde/Makefile
> index 7f9020e634f3..c11867e28233 100644
> --- a/drivers/staging/media/tegra-vde/Makefile
> +++ b/drivers/staging/media/tegra-vde/Makefile
> @@ -1,2 +1,3 @@
>  # SPDX-License-Identifier: GPL-2.0
> +tegra-vde-y := vde.o iommu.o
>  obj-$(CONFIG_TEGRA_VDE)	+= tegra-vde.o
> diff --git a/drivers/staging/media/tegra-vde/iommu.c b/drivers/staging/media/tegra-vde/iommu.c
> new file mode 100644
> index 000000000000..295c3d7cccd3
> --- /dev/null
> +++ b/drivers/staging/media/tegra-vde/iommu.c
> @@ -0,0 +1,148 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * NVIDIA Tegra Video decoder driver
> + *
> + * Copyright (C) 2016-2019 GRATE-DRIVER project
> + */
> +
> +#include <linux/iommu.h>
> +#include <linux/iova.h>
> +#include <linux/kernel.h>
> +#include <linux/platform_device.h>
> +
> +#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
> +#include <asm/dma-iommu.h>
> +#endif
> +
> +#include "vde.h"
> +
> +int tegra_vde_iommu_map(struct tegra_vde *vde,
> +			struct sg_table *sgt,
> +			struct iova **iovap,
> +			dma_addr_t *addrp,
> +			size_t size)
> +{
> +	struct iova *iova;
> +	unsigned long shift;
> +	unsigned long end;
> +	dma_addr_t addr;
> +
> +	end = vde->domain->geometry.aperture_end;
> +	size = iova_align(&vde->iova, size);
> +	shift = iova_shift(&vde->iova);
> +
> +	iova = alloc_iova(&vde->iova, size >> shift, end >> shift, true);
> +	if (!iova)
> +		return -ENOMEM;
> +
> +	addr = iova_dma_addr(&vde->iova, iova);
> +
> +	size = iommu_map_sg(vde->domain, addr, sgt->sgl, sgt->nents,
> +			    IOMMU_READ | IOMMU_WRITE);
> +	if (!size) {
> +		__free_iova(&vde->iova, iova);
> +		return -ENXIO;
> +	}
> +
> +	*iovap = iova;
> +	*addrp = addr;
> +
> +	return 0;
> +}
> +
> +void tegra_vde_iommu_unmap(struct tegra_vde *vde, struct iova *iova)
> +{
> +	unsigned long shift = iova_shift(&vde->iova);
> +	unsigned long size = iova_size(iova) << shift;
> +	dma_addr_t addr = iova_dma_addr(&vde->iova, iova);
> +
> +	iommu_unmap(vde->domain, addr, size);
> +	__free_iova(&vde->iova, iova);
> +}
> +
> +int tegra_vde_iommu_init(struct tegra_vde *vde)
> +{
> +	struct iova *iova;
> +	unsigned long order;
> +	unsigned long shift;
> +	int err;
> +
> +	vde->group = iommu_group_get(vde->miscdev.parent);
> +	if (!vde->group)
> +		return 0;
> +
> +#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
> +	if (dev->archdata.mapping) {

'dev' doesn't exist, so this fails to compile!

Regards,

	Hans

> +		struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
> +
> +		arm_iommu_detach_device(dev);
> +		arm_iommu_release_mapping(mapping);
> +	}
> +#endif
> +	vde->domain = iommu_domain_alloc(&platform_bus_type);
> +	if (!vde->domain) {
> +		err = -ENOMEM;
> +		goto put_group;
> +	}
> +
> +	err = iova_cache_get();
> +	if (err)
> +		goto free_domain;
> +
> +	order = __ffs(vde->domain->pgsize_bitmap);
> +	init_iova_domain(&vde->iova, 1UL << order, 0);
> +
> +	err = iommu_attach_group(vde->domain, vde->group);
> +	if (err)
> +		goto put_iova;
> +
> +	/*
> +	 * We're using some static addresses that are not accessible by VDE
> +	 * to trap invalid memory accesses.
> +	 */
> +	shift = iova_shift(&vde->iova);
> +	iova = reserve_iova(&vde->iova, 0x60000000 >> shift,
> +			    0x70000000 >> shift);
> +	if (!iova) {
> +		err = -ENOMEM;
> +		goto detach_group;
> +	}
> +
> +	/*
> +	 * BSEV's end addresses wraps around due to integer overflow on
> +	 * hardware context set up if IOVA is allocated at the end of
> +	 * address space and VDE can't handle that. Hence simply reserve
> +	 * the last page to avoid the problem.
> +	 */
> +	iova = reserve_iova(&vde->iova, (0xffffffff >> shift) - 1,
> +			    0xffffffff >> shift);
> +	if (!iova) {
> +		err = -ENOMEM;
> +		goto detach_group;
> +	}
> +
> +	return 0;
> +
> +detach_group:
> +	iommu_detach_group(vde->domain, vde->group);
> +put_iova:
> +	put_iova_domain(&vde->iova);
> +	iova_cache_put();
> +free_domain:
> +	iommu_domain_free(vde->domain);
> +put_group:
> +	iommu_group_put(vde->group);
> +
> +	return err;
> +}
> +
> +void tegra_vde_iommu_deinit(struct tegra_vde *vde)
> +{
> +	if (vde->domain) {
> +		iommu_detach_group(vde->domain, vde->group);
> +		put_iova_domain(&vde->iova);
> +		iova_cache_put();
> +		iommu_domain_free(vde->domain);
> +		iommu_group_put(vde->group);
> +	}
> +}
> diff --git a/drivers/staging/media/tegra-vde/trace.h b/drivers/staging/media/tegra-vde/trace.h
> index 85e2f7e2d4d0..c7e7d6f5fd4c 100644
> --- a/drivers/staging/media/tegra-vde/trace.h
> +++ b/drivers/staging/media/tegra-vde/trace.h
> @@ -7,6 +7,7 @@
>  #define TEGRA_VDE_TRACE_H
>  
>  #include <linux/tracepoint.h>
> +#include "vde.h"
>  
>  DECLARE_EVENT_CLASS(register_access,
>  	TP_PROTO(struct tegra_vde *vde, void __iomem *base,
> diff --git a/drivers/staging/media/tegra-vde/tegra-vde.c b/drivers/staging/media/tegra-vde/vde.c
> similarity index 91%
> rename from drivers/staging/media/tegra-vde/tegra-vde.c
> rename to drivers/staging/media/tegra-vde/vde.c
> index cc4244da2705..cbcdbfef072d 100644
> --- a/drivers/staging/media/tegra-vde/tegra-vde.c
> +++ b/drivers/staging/media/tegra-vde/vde.c
> @@ -22,6 +22,10 @@
>  #include <soc/tegra/pmc.h>
>  
>  #include "uapi.h"
> +#include "vde.h"
> +
> +#define CREATE_TRACE_POINTS
> +#include "trace.h"
>  
>  #define ICMDQUE_WR		0x00
>  #define CMDQUE_CONTROL		0x08
> @@ -33,6 +37,10 @@
>  #define BSE_DMA_BUSY		BIT(23)
>  
>  struct video_frame {
> +	struct iova *y_iova;
> +	struct iova *cb_iova;
> +	struct iova *cr_iova;
> +	struct iova *aux_iova;
>  	struct dma_buf_attachment *y_dmabuf_attachment;
>  	struct dma_buf_attachment *cb_dmabuf_attachment;
>  	struct dma_buf_attachment *cr_dmabuf_attachment;
> @@ -49,63 +57,6 @@ struct video_frame {
>  	u32 flags;
>  };
>  
> -struct tegra_vde {
> -	void __iomem *sxe;
> -	void __iomem *bsev;
> -	void __iomem *mbe;
> -	void __iomem *ppe;
> -	void __iomem *mce;
> -	void __iomem *tfe;
> -	void __iomem *ppb;
> -	void __iomem *vdma;
> -	void __iomem *frameid;
> -	struct mutex lock;
> -	struct miscdevice miscdev;
> -	struct reset_control *rst;
> -	struct reset_control *rst_mc;
> -	struct gen_pool *iram_pool;
> -	struct completion decode_completion;
> -	struct clk *clk;
> -	dma_addr_t iram_lists_addr;
> -	u32 *iram;
> -};
> -
> -static __maybe_unused char const *
> -tegra_vde_reg_base_name(struct tegra_vde *vde, void __iomem *base)
> -{
> -	if (vde->sxe == base)
> -		return "SXE";
> -
> -	if (vde->bsev == base)
> -		return "BSEV";
> -
> -	if (vde->mbe == base)
> -		return "MBE";
> -
> -	if (vde->ppe == base)
> -		return "PPE";
> -
> -	if (vde->mce == base)
> -		return "MCE";
> -
> -	if (vde->tfe == base)
> -		return "TFE";
> -
> -	if (vde->ppb == base)
> -		return "PPB";
> -
> -	if (vde->vdma == base)
> -		return "VDMA";
> -
> -	if (vde->frameid == base)
> -		return "FRAMEID";
> -
> -	return "???";
> -}
> -
> -#define CREATE_TRACE_POINTS
> -#include "trace.h"
> -
>  static void tegra_vde_writel(struct tegra_vde *vde,
>  			     u32 value, void __iomem *base, u32 offset)
>  {
> @@ -543,28 +494,35 @@ static void tegra_vde_decode_frame(struct tegra_vde *vde,
>  			 vde->sxe, 0x00);
>  }
>  
> -static void tegra_vde_detach_and_put_dmabuf(struct dma_buf_attachment *a,
> +static void tegra_vde_detach_and_put_dmabuf(struct tegra_vde *vde,
> +					    enum dma_data_direction dma_dir,
> +					    struct dma_buf_attachment *a,
>  					    struct sg_table *sgt,
> -					    enum dma_data_direction dma_dir)
> +					    struct iova *iova)
>  {
>  	struct dma_buf *dmabuf = a->dmabuf;
>  
> +	if (vde->domain)
> +		tegra_vde_iommu_unmap(vde, iova);
> +
>  	dma_buf_unmap_attachment(a, sgt, dma_dir);
>  	dma_buf_detach(dmabuf, a);
>  	dma_buf_put(dmabuf);
>  }
>  
> -static int tegra_vde_attach_dmabuf(struct device *dev,
> +static int tegra_vde_attach_dmabuf(struct tegra_vde *vde,
>  				   int fd,
>  				   unsigned long offset,
>  				   size_t min_size,
>  				   size_t align_size,
>  				   struct dma_buf_attachment **a,
> -				   dma_addr_t *addr,
> +				   dma_addr_t *addrp,
>  				   struct sg_table **s,
> +				   struct iova **iovap,
>  				   size_t *size,
>  				   enum dma_data_direction dma_dir)
>  {
> +	struct device *dev = vde->miscdev.parent;
>  	struct dma_buf_attachment *attachment;
>  	struct dma_buf *dmabuf;
>  	struct sg_table *sgt;
> @@ -602,13 +560,23 @@ static int tegra_vde_attach_dmabuf(struct device *dev,
>  		goto err_detach;
>  	}
>  
> -	if (sgt->nents != 1) {
> -		dev_err(dev, "Sparse DMA region is unsupported\n");
> +	if (!vde->domain && sgt->nents > 1) {
> +		dev_err(dev, "Sparse DMA region is unsupported, please enable IOMMU\n");
>  		err = -EINVAL;
>  		goto err_unmap;
>  	}
>  
> -	*addr = sg_dma_address(sgt->sgl) + offset;
> +	if (vde->domain) {
> +		err = tegra_vde_iommu_map(vde, sgt, iovap, addrp, dmabuf->size);
> +		if (err) {
> +			dev_err(dev, "IOMMU mapping failed: %d\n", err);
> +			goto err_unmap;
> +		}
> +	} else {
> +		*addrp = sg_dma_address(sgt->sgl);
> +	}
> +
> +	*addrp = *addrp + offset;
>  	*a = attachment;
>  	*s = sgt;
>  
> @@ -627,7 +595,7 @@ static int tegra_vde_attach_dmabuf(struct device *dev,
>  	return err;
>  }
>  
> -static int tegra_vde_attach_dmabufs_to_frame(struct device *dev,
> +static int tegra_vde_attach_dmabufs_to_frame(struct tegra_vde *vde,
>  					     struct video_frame *frame,
>  					     struct tegra_vde_h264_frame *src,
>  					     enum dma_data_direction dma_dir,
> @@ -636,29 +604,32 @@ static int tegra_vde_attach_dmabufs_to_frame(struct device *dev,
>  {
>  	int err;
>  
> -	err = tegra_vde_attach_dmabuf(dev, src->y_fd,
> +	err = tegra_vde_attach_dmabuf(vde, src->y_fd,
>  				      src->y_offset, lsize, SZ_256,
>  				      &frame->y_dmabuf_attachment,
>  				      &frame->y_addr,
>  				      &frame->y_sgt,
> +				      &frame->y_iova,
>  				      NULL, dma_dir);
>  	if (err)
>  		return err;
>  
> -	err = tegra_vde_attach_dmabuf(dev, src->cb_fd,
> +	err = tegra_vde_attach_dmabuf(vde, src->cb_fd,
>  				      src->cb_offset, csize, SZ_256,
>  				      &frame->cb_dmabuf_attachment,
>  				      &frame->cb_addr,
>  				      &frame->cb_sgt,
> +				      &frame->cb_iova,
>  				      NULL, dma_dir);
>  	if (err)
>  		goto err_release_y;
>  
> -	err = tegra_vde_attach_dmabuf(dev, src->cr_fd,
> +	err = tegra_vde_attach_dmabuf(vde, src->cr_fd,
>  				      src->cr_offset, csize, SZ_256,
>  				      &frame->cr_dmabuf_attachment,
>  				      &frame->cr_addr,
>  				      &frame->cr_sgt,
> +				      &frame->cr_iova,
>  				      NULL, dma_dir);
>  	if (err)
>  		goto err_release_cb;
> @@ -668,11 +639,12 @@ static int tegra_vde_attach_dmabufs_to_frame(struct device *dev,
>  		return 0;
>  	}
>  
> -	err = tegra_vde_attach_dmabuf(dev, src->aux_fd,
> +	err = tegra_vde_attach_dmabuf(vde, src->aux_fd,
>  				      src->aux_offset, csize, SZ_256,
>  				      &frame->aux_dmabuf_attachment,
>  				      &frame->aux_addr,
>  				      &frame->aux_sgt,
> +				      &frame->aux_iova,
>  				      NULL, dma_dir);
>  	if (err)
>  		goto err_release_cr;
> @@ -680,34 +652,49 @@ static int tegra_vde_attach_dmabufs_to_frame(struct device *dev,
>  	return 0;
>  
>  err_release_cr:
> -	tegra_vde_detach_and_put_dmabuf(frame->cr_dmabuf_attachment,
> -					frame->cr_sgt, dma_dir);
> +	tegra_vde_detach_and_put_dmabuf(vde, dma_dir,
> +					frame->cr_dmabuf_attachment,
> +					frame->cr_sgt,
> +					frame->cr_iova);
>  err_release_cb:
> -	tegra_vde_detach_and_put_dmabuf(frame->cb_dmabuf_attachment,
> -					frame->cb_sgt, dma_dir);
> +	tegra_vde_detach_and_put_dmabuf(vde, dma_dir,
> +					frame->cb_dmabuf_attachment,
> +					frame->cb_sgt,
> +					frame->cb_iova);
>  err_release_y:
> -	tegra_vde_detach_and_put_dmabuf(frame->y_dmabuf_attachment,
> -					frame->y_sgt, dma_dir);
> +	tegra_vde_detach_and_put_dmabuf(vde, dma_dir,
> +					frame->y_dmabuf_attachment,
> +					frame->y_sgt,
> +					frame->y_iova);
>  
>  	return err;
>  }
>  
> -static void tegra_vde_release_frame_dmabufs(struct video_frame *frame,
> +static void tegra_vde_release_frame_dmabufs(struct tegra_vde *vde,
> +					    struct video_frame *frame,
>  					    enum dma_data_direction dma_dir,
>  					    bool baseline_profile)
>  {
>  	if (!baseline_profile)
> -		tegra_vde_detach_and_put_dmabuf(frame->aux_dmabuf_attachment,
> -						frame->aux_sgt, dma_dir);
> -
> -	tegra_vde_detach_and_put_dmabuf(frame->cr_dmabuf_attachment,
> -					frame->cr_sgt, dma_dir);
> -
> -	tegra_vde_detach_and_put_dmabuf(frame->cb_dmabuf_attachment,
> -					frame->cb_sgt, dma_dir);
> -
> -	tegra_vde_detach_and_put_dmabuf(frame->y_dmabuf_attachment,
> -					frame->y_sgt, dma_dir);
> +		tegra_vde_detach_and_put_dmabuf(vde, dma_dir,
> +						frame->aux_dmabuf_attachment,
> +						frame->aux_sgt,
> +						frame->aux_iova);
> +
> +	tegra_vde_detach_and_put_dmabuf(vde, dma_dir,
> +					frame->cr_dmabuf_attachment,
> +					frame->cr_sgt,
> +					frame->cr_iova);
> +
> +	tegra_vde_detach_and_put_dmabuf(vde, dma_dir,
> +					frame->cb_dmabuf_attachment,
> +					frame->cb_sgt,
> +					frame->cb_iova);
> +
> +	tegra_vde_detach_and_put_dmabuf(vde, dma_dir,
> +					frame->y_dmabuf_attachment,
> +					frame->y_sgt,
> +					frame->y_iova);
>  }
>  
>  static int tegra_vde_validate_frame(struct device *dev,
> @@ -800,6 +787,7 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
>  	struct video_frame *dpb_frames;
>  	struct dma_buf_attachment *bitstream_data_dmabuf_attachment;
>  	struct sg_table *bitstream_sgt;
> +	struct iova *bitstream_iova;
>  	enum dma_data_direction dma_dir;
>  	dma_addr_t bitstream_data_addr;
>  	dma_addr_t bsev_ptr;
> @@ -819,12 +807,13 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
>  	if (ret)
>  		return ret;
>  
> -	ret = tegra_vde_attach_dmabuf(dev, ctx.bitstream_data_fd,
> +	ret = tegra_vde_attach_dmabuf(vde, ctx.bitstream_data_fd,
>  				      ctx.bitstream_data_offset,
>  				      SZ_16K, SZ_16K,
>  				      &bitstream_data_dmabuf_attachment,
>  				      &bitstream_data_addr,
>  				      &bitstream_sgt,
> +				      &bitstream_iova,
>  				      &bitstream_data_size,
>  				      DMA_TO_DEVICE);
>  	if (ret)
> @@ -866,7 +855,7 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
>  
>  		dma_dir = (i == 0) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
>  
> -		ret = tegra_vde_attach_dmabufs_to_frame(dev, &dpb_frames[i],
> +		ret = tegra_vde_attach_dmabufs_to_frame(vde, &dpb_frames[i],
>  							&frames[i], dma_dir,
>  							ctx.baseline_profile,
>  							lsize, csize);
> @@ -954,7 +943,7 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
>  	while (i--) {
>  		dma_dir = (i == 0) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
>  
> -		tegra_vde_release_frame_dmabufs(&dpb_frames[i], dma_dir,
> +		tegra_vde_release_frame_dmabufs(vde, &dpb_frames[i], dma_dir,
>  						ctx.baseline_profile);
>  	}
>  
> @@ -965,8 +954,10 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
>  	kfree(frames);
>  
>  release_bitstream_dmabuf:
> -	tegra_vde_detach_and_put_dmabuf(bitstream_data_dmabuf_attachment,
> -					bitstream_sgt, DMA_TO_DEVICE);
> +	tegra_vde_detach_and_put_dmabuf(vde, DMA_TO_DEVICE,
> +					bitstream_data_dmabuf_attachment,
> +					bitstream_sgt,
> +					bitstream_iova);
>  
>  	return ret;
>  }
> @@ -1176,10 +1167,16 @@ static int tegra_vde_probe(struct platform_device *pdev)
>  	vde->miscdev.fops = &tegra_vde_fops;
>  	vde->miscdev.parent = dev;
>  
> +	err = tegra_vde_iommu_init(vde);
> +	if (err) {
> +		dev_err(dev, "Failed to initialize IOMMU: %d\n", err);
> +		goto err_gen_free;
> +	}
> +
>  	err = misc_register(&vde->miscdev);
>  	if (err) {
>  		dev_err(dev, "Failed to register misc device: %d\n", err);
> -		goto err_gen_free;
> +		goto err_deinit_iommu;
>  	}
>  
>  	pm_runtime_enable(dev);
> @@ -1197,6 +1194,9 @@ static int tegra_vde_probe(struct platform_device *pdev)
>  err_misc_unreg:
>  	misc_deregister(&vde->miscdev);
>  
> +err_deinit_iommu:
> +	tegra_vde_iommu_deinit(vde);
> +
>  err_gen_free:
>  	gen_pool_free(vde->iram_pool, (unsigned long)vde->iram,
>  		      gen_pool_size(vde->iram_pool));
> @@ -1221,6 +1221,8 @@ static int tegra_vde_remove(struct platform_device *pdev)
>  
>  	misc_deregister(&vde->miscdev);
>  
> +	tegra_vde_iommu_deinit(vde);
> +
>  	gen_pool_free(vde->iram_pool, (unsigned long)vde->iram,
>  		      gen_pool_size(vde->iram_pool));
>  
> diff --git a/drivers/staging/media/tegra-vde/vde.h b/drivers/staging/media/tegra-vde/vde.h
> new file mode 100644
> index 000000000000..37414b7fdee1
> --- /dev/null
> +++ b/drivers/staging/media/tegra-vde/vde.h
> @@ -0,0 +1,89 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * NVIDIA Tegra Video decoder driver
> + *
> + * Copyright (C) 2016-2019 GRATE-DRIVER project
> + */
> +
> +#ifndef TEGRA_VDE_H
> +#define TEGRA_VDE_H
> +
> +#include <linux/completion.h>
> +#include <linux/miscdevice.h>
> +#include <linux/mutex.h>
> +#include <linux/types.h>
> +#include <linux/iova.h>
> +
> +struct clk;
> +struct gen_pool;
> +struct iommu_group;
> +struct iommu_domain;
> +struct reset_control;
> +
> +struct tegra_vde {
> +	void __iomem *sxe;
> +	void __iomem *bsev;
> +	void __iomem *mbe;
> +	void __iomem *ppe;
> +	void __iomem *mce;
> +	void __iomem *tfe;
> +	void __iomem *ppb;
> +	void __iomem *vdma;
> +	void __iomem *frameid;
> +	struct mutex lock;
> +	struct miscdevice miscdev;
> +	struct reset_control *rst;
> +	struct reset_control *rst_mc;
> +	struct gen_pool *iram_pool;
> +	struct completion decode_completion;
> +	struct clk *clk;
> +	struct iommu_domain *domain;
> +	struct iommu_group *group;
> +	struct iova_domain iova;
> +	dma_addr_t iram_lists_addr;
> +	u32 *iram;
> +};
> +
> +int tegra_vde_iommu_init(struct tegra_vde *vde);
> +void tegra_vde_iommu_deinit(struct tegra_vde *vde);
> +int tegra_vde_iommu_map(struct tegra_vde *vde,
> +			struct sg_table *sgt,
> +			struct iova **iovap,
> +			dma_addr_t *addrp,
> +			size_t size);
> +void tegra_vde_iommu_unmap(struct tegra_vde *vde, struct iova *iova);
> +
> +static __maybe_unused char const *
> +tegra_vde_reg_base_name(struct tegra_vde *vde, void __iomem *base)
> +{
> +	if (vde->sxe == base)
> +		return "SXE";
> +
> +	if (vde->bsev == base)
> +		return "BSEV";
> +
> +	if (vde->mbe == base)
> +		return "MBE";
> +
> +	if (vde->ppe == base)
> +		return "PPE";
> +
> +	if (vde->mce == base)
> +		return "MCE";
> +
> +	if (vde->tfe == base)
> +		return "TFE";
> +
> +	if (vde->ppb == base)
> +		return "PPB";
> +
> +	if (vde->vdma == base)
> +		return "VDMA";
> +
> +	if (vde->frameid == base)
> +		return "FRAMEID";
> +
> +	return "???";
> +}
> +
> +#endif /* TEGRA_VDE_H */
> 



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