5.4-stable review patch. If anyone has any objections, please let me know.
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From: Arun Kumar Neelakantam aneela@codeaurora.org
[ Upstream commit 8956927faed366b60b0355f4a4317a10e281ced7 ]
With current design the transport can send packets of size upto FIFO_SIZE which is 16k and return failure for all packets above 16k.
Add TX_DATA_CONT command to send packets greater than 16k by splitting into 8K chunks.
Signed-off-by: Arun Kumar Neelakantam aneela@codeaurora.org Signed-off-by: Deepak Kumar Singh deesin@codeaurora.org Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org Link: https://lore.kernel.org/r/1596086296-28529-4-git-send-email-deesin@codeauror... Stable-dep-of: 06c59d97f63c ("rpmsg: glink: use only lower 16-bits of param2 for CMD_OPEN name length") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/rpmsg/qcom_glink_native.c | 38 +++++++++++++++++++++++++++---- 1 file changed, 34 insertions(+), 4 deletions(-)
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 2dea1e7487bb4..421ed358ad9cd 100644 --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -1276,6 +1276,8 @@ static int __qcom_glink_send(struct glink_channel *channel, } __packed req; int ret; unsigned long flags; + int chunk_size = len; + int left_size = 0;
if (!glink->intentless) { while (!intent) { @@ -1309,18 +1311,46 @@ static int __qcom_glink_send(struct glink_channel *channel, iid = intent->id; }
+ if (wait && chunk_size > SZ_8K) { + chunk_size = SZ_8K; + left_size = len - chunk_size; + } req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA); req.msg.param1 = cpu_to_le16(channel->lcid); req.msg.param2 = cpu_to_le32(iid); - req.chunk_size = cpu_to_le32(len); - req.left_size = cpu_to_le32(0); + req.chunk_size = cpu_to_le32(chunk_size); + req.left_size = cpu_to_le32(left_size);
- ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait); + ret = qcom_glink_tx(glink, &req, sizeof(req), data, chunk_size, wait);
/* Mark intent available if we failed */ - if (ret && intent) + if (ret && intent) { intent->in_use = false; + return ret; + }
+ while (left_size > 0) { + data = (void *)((char *)data + chunk_size); + chunk_size = left_size; + if (chunk_size > SZ_8K) + chunk_size = SZ_8K; + left_size -= chunk_size; + + req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA_CONT); + req.msg.param1 = cpu_to_le16(channel->lcid); + req.msg.param2 = cpu_to_le32(iid); + req.chunk_size = cpu_to_le32(chunk_size); + req.left_size = cpu_to_le32(left_size); + + ret = qcom_glink_tx(glink, &req, sizeof(req), data, + chunk_size, wait); + + /* Mark intent available if we failed */ + if (ret && intent) { + intent->in_use = false; + break; + } + } return ret; }