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authorBjorn Andersson <bjorn.andersson@linaro.org>2017-08-24 12:51:27 +0530
committerBjorn Andersson <bjorn.andersson@linaro.org>2017-08-29 14:29:33 -0700
commit7339859da8dfa8924047a5917ceb06f479b35fcb (patch)
tree8e9f64bc428c54d5db2a69131f8aa9c34a61b80d /drivers/rpmsg
parent835764ddd9af0d943a2ac7fb4597800e8b0871d2 (diff)
downloadlinux-7339859da8dfa8924047a5917ceb06f479b35fcb.tar.gz
rpmsg: glink: Allow unaligned data access
Glink protocol requires that each message is aligned on a 8 byte offset. This is purely a restriction from glink, so in order to support clients which do not adher to this, allow data packets of any size, but align the head index accordingly, effectively removing the alignment restriction. Acked-by: Arun Kumar Neelakantam <aneela@codeaurora.org> Signed-off-by: Sricharan R <sricharan@codeaurora.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/rpmsg')
-rw-r--r--drivers/rpmsg/qcom_glink_native.c6
-rw-r--r--drivers/rpmsg/qcom_glink_rpm.c22
2 files changed, 21 insertions, 7 deletions
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index ffdf88e436a7..a6394cdce1ac 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -227,9 +227,6 @@ static int qcom_glink_tx(struct qcom_glink *glink,
if (tlen >= glink->tx_pipe->length)
return -EINVAL;
- if (WARN(tlen % 8, "Unaligned TX request"))
- return -EINVAL;
-
ret = mutex_lock_interruptible(&glink->tx_lock);
if (ret)
return ret;
@@ -695,9 +692,6 @@ static int __qcom_glink_send(struct glink_channel *channel,
__le32 left_size;
} __packed req;
- if (WARN(len % 8, "RPM GLINK expects 8 byte aligned messages\n"))
- return -EINVAL;
-
req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA);
req.msg.param1 = cpu_to_le16(channel->lcid);
req.msg.param2 = cpu_to_le32(channel->rcid);
diff --git a/drivers/rpmsg/qcom_glink_rpm.c b/drivers/rpmsg/qcom_glink_rpm.c
index 33daa3223ce0..cc73af0aae8a 100644
--- a/drivers/rpmsg/qcom_glink_rpm.c
+++ b/drivers/rpmsg/qcom_glink_rpm.c
@@ -156,11 +156,31 @@ static void glink_rpm_tx_write(struct qcom_glink_pipe *glink_pipe,
const void *data, size_t dlen)
{
struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe);
+ size_t tlen = hlen + dlen;
+ size_t aligned_dlen;
unsigned int head;
+ char padding[8] = {0};
+ size_t pad;
+
+ /* Header length comes from glink native and is always 4 byte aligned */
+ if (WARN(hlen % 4, "Glink Header length must be 4 bytes aligned\n"))
+ return;
+
+ /*
+ * Move the unaligned tail of the message to the padding chunk, to
+ * ensure word aligned accesses
+ */
+ aligned_dlen = ALIGN_DOWN(dlen, 4);
+ if (aligned_dlen != dlen)
+ memcpy(padding, data + aligned_dlen, dlen - aligned_dlen);
head = readl(pipe->head);
head = glink_rpm_tx_write_one(pipe, head, hdr, hlen);
- head = glink_rpm_tx_write_one(pipe, head, data, dlen);
+ head = glink_rpm_tx_write_one(pipe, head, data, aligned_dlen);
+
+ pad = ALIGN(tlen, 8) - ALIGN_DOWN(tlen, 4);
+ if (pad)
+ head = glink_rpm_tx_write_one(pipe, head, padding, pad);
writel(head, pipe->head);
}