Commit 9dc34d63 authored by Sudeep Holla's avatar Sudeep Holla

firmware: arm_scmi: Check if platform has released shmem before using

Sometimes platfom may take too long to respond to the command and OS
might timeout before platform transfer the ownership of the shared
memory region to the OS with the response.

Since the mailbox channel associated with the channel is freed and new
commands are dispatch on the same channel, OS needs to wait until it
gets back the ownership. If not, either OS may end up overwriting the
platform response for the last command(which is fine as OS timed out
that command) or platform might overwrite the payload for the next
command with the response for the old.

The latter is problematic as platform may end up interpretting the
response as the payload. In order to avoid such race, let's wait until
the OS gets back the ownership before we prepare the shared memory with
the payload for the next command.
Reported-by: default avatarJim Quinlan <james.quinlan@broadcom.com>
Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
parent 5b65af8f
...@@ -265,6 +265,14 @@ static void scmi_tx_prepare(struct mbox_client *cl, void *m) ...@@ -265,6 +265,14 @@ static void scmi_tx_prepare(struct mbox_client *cl, void *m)
struct scmi_chan_info *cinfo = client_to_scmi_chan_info(cl); struct scmi_chan_info *cinfo = client_to_scmi_chan_info(cl);
struct scmi_shared_mem __iomem *mem = cinfo->payload; struct scmi_shared_mem __iomem *mem = cinfo->payload;
/*
* Ideally channel must be free by now unless OS timeout last
* request and platform continued to process the same, wait
* until it releases the shared memory, otherwise we may endup
* overwriting its response with new message payload or vice-versa
*/
spin_until_cond(ioread32(&mem->channel_status) &
SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE);
/* Mark channel busy + clear error */ /* Mark channel busy + clear error */
iowrite32(0x0, &mem->channel_status); iowrite32(0x0, &mem->channel_status);
iowrite32(t->hdr.poll_completion ? 0 : SCMI_SHMEM_FLAG_INTR_ENABLED, iowrite32(t->hdr.poll_completion ? 0 : SCMI_SHMEM_FLAG_INTR_ENABLED,
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment