linux-kernel - [PATCH 4.19 16/67] drm/msm: fix handling of cmdstream offset

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Date:   Thu, 20 Dec 2018 10:18:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Kristian H. Kristensen" <hoegsberg@...gle.com>,
        Rob Clark <robdclark@...il.com>,
        Sean Paul <seanpaul@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 16/67] drm/msm: fix handling of cmdstream offset

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 47e7f506ee6590ceb2efa1f08aca7f9f2ee5c1d3 ]

Userspace hasn't used submit cmds with submit_offset != 0 for a while,
but this starts cropping up again with cmdstream sub-buffer-allocation
in libdrm_freedreno.

Doesn't do much good to increment the buf ptr before assigning it.

Fixes: 78b8e5b847b4 drm/msm: dump a rd GPUADDR header for all buffers in the command
Reviewed-by: Kristian H. Kristensen <hoegsberg@...gle.com>
Signed-off-by: Rob Clark <robdclark@...il.com>
Signed-off-by: Sean Paul <seanpaul@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/msm_rd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_rd.c b/drivers/gpu/drm/msm/msm_rd.c
index 3aa8a8576abe..f7a0edea4705 100644
--- a/drivers/gpu/drm/msm/msm_rd.c
+++ b/drivers/gpu/drm/msm/msm_rd.c
@@ -316,10 +316,11 @@ static void snapshot_buf(struct msm_rd_state *rd,
 		uint64_t iova, uint32_t size)
 {
 	struct msm_gem_object *obj = submit->bos[idx].obj;
+	unsigned offset = 0;
 	const char *buf;
 
 	if (iova) {
-		buf += iova - submit->bos[idx].iova;
+		offset = iova - submit->bos[idx].iova;
 	} else {
 		iova = submit->bos[idx].iova;
 		size = obj->base.size;
@@ -340,6 +341,8 @@ static void snapshot_buf(struct msm_rd_state *rd,
 	if (IS_ERR(buf))
 		return;
 
+	buf += offset;
+
 	rd_write_section(rd, RD_BUFFER_CONTENTS, buf, size);
 
 	msm_gem_put_vaddr(&obj->base);
-- 
2.19.1