Re: [PATCH 02/14] media: mediatek: vcodec: allocate tee share memory

[AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>]

Il 11/09/23 14:59, Yunfei Dong ha scritto:
> Allocate two share memory for each lat and core hardware used to share
> information with optee-os. Msg buffer used to send ipi command and get ack
> command with optee-os, data buffer used to store vsi information which
> used for hardware decode.
> 
> Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
> ---
>   .../vcodec/decoder/mtk_vcodec_dec_optee.c     | 79 ++++++++++++++++++-
>   .../vcodec/decoder/mtk_vcodec_dec_optee.h     | 32 ++++++++
>   2 files changed, 110 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_optee.c b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_optee.c
> index 3ee9039d2a5b..806ca87c8de7 100644
> --- a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_optee.c
> +++ b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_optee.c
> @@ -47,12 +47,67 @@ int mtk_vcodec_dec_optee_private_init(struct mtk_vcodec_dec_dev *vcodec_dev)
>   }
>   EXPORT_SYMBOL_GPL(mtk_vcodec_dec_optee_private_init);
>   
> +static void mtk_vcodec_dec_optee_deinit_memref(struct mtk_vdec_optee_ca_info *ca_info,
> +					       enum mtk_vdec_optee_data_index data_index)
> +{
> +	tee_shm_free(ca_info->shm_memref[data_index].msg_shm);
> +}
> +
> +static int mtk_vcodec_dec_optee_init_memref(struct tee_context *tee_vdec_ctx,
> +					    struct mtk_vdec_optee_ca_info *ca_info,
> +					    enum mtk_vdec_optee_data_index data_index)
> +{
> +	struct mtk_vdec_optee_shm_memref *shm_memref;
> +	int alloc_size = 0, err = 0;
> +	u64 shm_param_type = 0;
> +	bool copy_buffer;
> +
> +	if (data_index >= OPTEE_MAX_INDEX) {
> +		pr_err(MTK_DBG_VCODEC_STR "tee invalid data_index: %d.\n", data_index);
> +		return -EINVAL;
> +	} else if (data_index == OPTEE_MSG_INDEX) {
> +		shm_param_type = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT;
> +		alloc_size = MTK_VDEC_OPTEE_MSG_SIZE;
> +		copy_buffer = true;
> +	} else {
> +		shm_param_type = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT;
> +		alloc_size = MTK_VDEC_OPTEE_HW_SIZE;
> +		copy_buffer = false;
> +	}

This is another good usecase for a switch.

	switch (data_index) {
	case OPTEE_MSG_INDEX:
		......
	case OPTEE_DATA_INDEX:
		......
	default:
		invalid data_index; return....
	}

> +
> +	shm_memref = &ca_info->shm_memref[data_index];
> +
> +	/* Allocate dynamic shared memory with decoder TA */
> +	shm_memref->msg_shm_size = alloc_size;
> +	shm_memref->param_type = shm_param_type;
> +	shm_memref->copy_to_ta = copy_buffer;
> +	shm_memref->msg_shm =
> +		tee_shm_alloc_kernel_buf(tee_vdec_ctx, shm_memref->msg_shm_size);

That'd be 96 columns, one line is ok.

> +	if (IS_ERR(shm_memref->msg_shm)) {
> +		pr_err(MTK_DBG_VCODEC_STR "tee alloc buf fail: data_index:%d.\n", data_index);
> +		return -ENOMEM;
> +	}
> +
> +	shm_memref->msg_shm_ca_buf = tee_shm_get_va(shm_memref->msg_shm, 0);
> +	if (IS_ERR(shm_memref->msg_shm_ca_buf)) {
> +		pr_err(MTK_DBG_VCODEC_STR "tee get shm va fail: data_index:%d.\n", data_index);
> +		err = PTR_ERR(shm_memref->msg_shm_ca_buf);
> +		goto err_get_msg_va;
> +	}
> +
> +	return err;
> +
> +err_get_msg_va:
> +	tee_shm_free(shm_memref->msg_shm);
> +	return err;
> +}
> +
>   static int mtk_vcodec_dec_optee_init_hw_info(struct mtk_vdec_optee_private *optee_private,
>   					     enum mtk_vdec_hw_id hardware_index)
>   {
>   	struct tee_ioctl_open_session_arg session_arg;
>   	struct mtk_vdec_optee_ca_info *ca_info;
> -	int err = 0, session_func;
> +	int err = 0, i = 0, j = 0, session_func;

Please don't initialize `i` and `j` here, you can do that in the for loop as
per common practice.

>   
>   	/* Open lat and core session with vdec TA. */
>   	if (hardware_index == MTK_VDEC_LAT0) {
> @@ -81,6 +136,24 @@ static int mtk_vcodec_dec_optee_init_hw_info(struct mtk_vdec_optee_private *opte
>   	pr_debug(MTK_DBG_VCODEC_STR "open vdec tee session: hw_id(%d) session_id=%x.\n",
>   		 hardware_index, ca_info->vdec_session_id);
>   
> +	/* Allocate dynamic shared memory with decoder TA */
> +	for (; i < OPTEE_MAX_INDEX; i++) {
> +		err = mtk_vcodec_dec_optee_init_memref(optee_private->tee_vdec_ctx, ca_info, i);
> +		if (err) {
> +			pr_err(MTK_DBG_VCODEC_STR "init vdec memref failed: %d.\n", i);
> +			goto err_init_memref;
> +		}
> +	}
> +
> +	return err;
> +err_init_memref:
> +	if (i != 0) {
> +		for (; j < i; j++)
> +			mtk_vcodec_dec_optee_deinit_memref(ca_info, j);
> +	}
> +
> +	tee_client_close_session(optee_private->tee_vdec_ctx, ca_info->vdec_session_id);
> +
>   	return err;
>   }
>   
> @@ -88,12 +161,16 @@ static void mtk_vcodec_dec_optee_deinit_hw_info(struct mtk_vdec_optee_private *o
>   						enum mtk_vdec_hw_id hw_id)
>   {
>   	struct mtk_vdec_optee_ca_info *ca_info;
> +	int i = 0;

int i;

>   
>   	if (hw_id == MTK_VDEC_LAT0)
>   		ca_info = &optee_private->lat_ca;
>   	else
>   		ca_info = &optee_private->core_ca;
>   
> +	for (; i < OPTEE_MAX_INDEX; i++)

for (i = 0; i < OPTEE_MAX_INDEX; i++)

> +		mtk_vcodec_dec_optee_deinit_memref(ca_info, i);
> +
>   	tee_client_close_session(optee_private->tee_vdec_ctx, ca_info->vdec_session_id);
>   }
>   
> diff --git a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_optee.h b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_optee.h
> index 8b1dca49331e..79b4ec890655 100644
> --- a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_optee.h
> +++ b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_optee.h
> @@ -18,16 +18,48 @@
>   
>   #define MTK_OPTEE_MAX_TEE_PARAMS 4
>   
> +#define MTK_VDEC_OPTEE_MSG_SIZE     128
> +#define MTK_VDEC_OPTEE_HW_SIZE      (8 * SZ_1K)
> +
> +/**
> + * struct mtk_vdec_optee_shm_memref - share memory reference params
> + * @msg_shm:        message shared with TA in TEE.
> + * @msg_shm_ca_buf: ca buffer.
> + *
> + * @msg_shm_size:   share message size.
> + * @param_type:     each tee param types.
> + * @copy_to_ta:     need to copy data from ca to share memory.
> + */
> +struct mtk_vdec_optee_shm_memref {
> +	struct tee_shm *msg_shm;
> +	u8 *msg_shm_ca_buf;
> +
> +	u32 msg_shm_size;
> +	u64 param_type;
> +	bool copy_to_ta;
> +};
> +
>   /**
>    * struct mtk_vdec_optee_ca_info - ca related param
>    * @vdec_session_id:   optee TA session identifier.
>    * @hw_id:             hardware index.
>    * @vdec_session_func: trusted application function id used specific to the TA.
> + * @shm_memref:        share memory reference params.
>    */
>   struct mtk_vdec_optee_ca_info {
>   	u32 vdec_session_id;
>   	enum mtk_vdec_hw_id hw_id;
>   	u32 vdec_session_func;
> +	struct mtk_vdec_optee_shm_memref shm_memref[MTK_OPTEE_MAX_TEE_PARAMS];
> +};
> +
> +/*
> + * enum mtk_vdec_optee_data_index - used to indentify each share memory informaiton

Typo: informaiton -> information

> + */
> +enum mtk_vdec_optee_data_index {
> +	OPTEE_MSG_INDEX = 0,
> +	OPTEE_DATA_INDEX,
> +	OPTEE_MAX_INDEX,
>   };
>   
>   /**

Regards,
Angelo