linux-kernel - Re: [PATCH 1/2] misc: fastrpc: Add fdlist implementation

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Message-ID: <cadd374b-cb22-9eaf-0513-67b34ccbbcf1@linaro.org>
Date:   Tue, 30 Nov 2021 13:12:27 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Jeya R <jeyr@...eaurora.org>, ekangupt@....qualcomm.com,
        linux-arm-msm@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        fastrpc.upstream@....qualcomm.com
Subject: Re: [PATCH 1/2] misc: fastrpc: Add fdlist implementation

Hi Jeya,

This is version 2 of the patchset which is not reflected in the subject 
line.




On 30/11/2021 12:54, Jeya R wrote:
> Add fdlist implementation to support dma handles. fdlist is populated
> by DSP if any map is no longer used and it is freed during put_args.
> 
> Signed-off-by: Jeya R <jeyr@...eaurora.org>
> ---
>   drivers/misc/fastrpc.c | 22 ++++++++++++++++++++--
>   1 file changed, 20 insertions(+), 2 deletions(-)

Have you missed comments my comments on this patch

https://www.spinics.net/lists/linux-arm-msm/msg99023.html

--srini

> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index 39aca77..3c937ff 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -353,7 +353,7 @@ static void fastrpc_context_free(struct kref *ref)
>   	ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount);
>   	cctx = ctx->cctx;
>   
> -	for (i = 0; i < ctx->nscalars; i++)
> +	for (i = 0; i < ctx->nbufs; i++)
>   		fastrpc_map_put(ctx->maps[i]);
>   
>   	if (ctx->buf)
> @@ -785,6 +785,7 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
>   	err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
>   	if (err)
>   		return err;
> +	memset(ctx->buf->virt, 0, pkt_size);
>   
>   	rpra = ctx->buf->virt;
>   	list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
> @@ -887,9 +888,19 @@ static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
>   			    u32 kernel)
>   {
>   	struct fastrpc_remote_arg *rpra = ctx->rpra;
> -	int i, inbufs;
> +	struct fastrpc_map *mmap = NULL;
> +	struct fastrpc_invoke_buf *list;
> +	struct fastrpc_phy_page *pages;
> +	u64 *fdlist;
> +	int i, inbufs, outbufs, handles;
>   
>   	inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
> +	outbufs = REMOTE_SCALARS_OUTBUFS(ctx->sc);
> +	handles = REMOTE_SCALARS_INHANDLES(ctx->sc) + REMOTE_SCALARS_OUTHANDLES(ctx->sc);
> +	list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
> +	pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) +
> +		sizeof(*rpra));
> +	fdlist = (uint64_t *)(pages + inbufs + outbufs + handles);
>   
>   	for (i = inbufs; i < ctx->nbufs; ++i) {
>   		if (!ctx->maps[i]) {
> @@ -906,6 +917,13 @@ static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
>   		}
>   	}
>   
> +	for (i = 0; i < FASTRPC_MAX_FDLIST; i++) {
> +		if (!fdlist[i])
> +			break;
> +		if (!fastrpc_map_find(fl, (int)fdlist[i], &mmap))
> +			fastrpc_map_put(mmap);
> +	}
> +
>   	return 0;
>   }
>   
>