linux-kernel - [PATCH v3 09/12] misc: fastrpc: Add helper function to get list and page

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Message-Id: <20220126135304.16340-10-srinivas.kandagatla@linaro.org>
Date:   Wed, 26 Jan 2022 13:53:01 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     robh+dt@...nel.org, gregkh@...uxfoundation.org
Cc:     devicetree@...r.kernel.org, ekangupt@....qualcomm.com,
        bkumar@....qualcomm.com, linux-kernel@...r.kernel.org,
        srini@...nel.org, bjorn.andersson@...aro.org,
        linux-arm-msm@...r.kernel.org,
        Vamsi Krishna Gattupalli <quic_vgattupa@...cinc.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH v3 09/12] misc: fastrpc: Add helper function to get list and page

From: Vamsi Krishna Gattupalli <quic_vgattupa@...cinc.com>

Add helper functions to get invoke buffer and page start pointers.

Signed-off-by: Vamsi Krishna Gattupalli <quic_vgattupa@...cinc.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/misc/fastrpc.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 0090085bfbb9..1c1815bed2c2 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -832,6 +832,16 @@ static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx)
 	return 0;
 }
 
+static struct fastrpc_invoke_buf *fastrpc_invoke_buf_start(union fastrpc_remote_arg *pra, int len)
+{
+	return (struct fastrpc_invoke_buf *)(&pra[len]);
+}
+
+static struct fastrpc_phy_page *fastrpc_phy_page_start(struct fastrpc_invoke_buf *buf, int len)
+{
+	return (struct fastrpc_phy_page *)(&buf[len]);
+}
+
 static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
 {
 	struct device *dev = ctx->fl->sctx->dev;
@@ -859,9 +869,8 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
 		return err;
 
 	rpra = ctx->buf->virt;
-	list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
-	pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) +
-		sizeof(*rpra));
+	list = fastrpc_invoke_buf_start(rpra, ctx->nscalars);
+	pages = fastrpc_phy_page_start(list, ctx->nscalars);
 	args = (uintptr_t)ctx->buf->virt + metalen;
 	rlen = pkt_size - metalen;
 	ctx->rpra = rpra;
-- 
2.21.0