linux-kernel - [PATCH 5/8] misc: fastrpc: consider address offset before sending to DSP

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Message-Id: <20190307101229.7856-6-srinivas.kandagatla@linaro.org>
Date:   Thu,  7 Mar 2019 10:12:26 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org, arnd@...db.de
Cc:     linux-kernel@...r.kernel.org, bjorn.andersson@...aro.org,
        bkumar@....qualcomm.com, linux-arm-msm@...r.kernel.org,
        ktadakam@....qualcomm.com,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 5/8] misc: fastrpc: consider address offset before sending to DSP

While passing address phy address to DSP, take care of the offset
calculated from virtual address vma.

Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/misc/fastrpc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index f71b5faae1dd..209f3e63f660 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -679,8 +679,16 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
 		pages[i].size = roundup(len, PAGE_SIZE);
 
 		if (ctx->maps[i]) {
+			struct vm_area_struct *vma = NULL;
+
 			rpra[i].pv = (u64) ctx->args[i].ptr;
 			pages[i].addr = ctx->maps[i]->phys;
+
+			vma = find_vma(current->mm, ctx->args[i].ptr);
+			if (vma)
+				pages[i].addr += ctx->args[i].ptr -
+						 vma->vm_start;
+
 		} else {
 			rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
 			args = ALIGN(args, FASTRPC_ALIGN);
-- 
2.21.0