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haven: rm: Send requests atomically to RM

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RM core driver can send out multiple requests in parallel to RM, e.g.
00111002302222113456111 (numbers indicate seq-id, and the recursion of a
number indicates fragments). RM can only process one request at a time
and would reject any messages unrelated to the request it was first
receiving. Thus, add a lock to enforce requests are sent sequentially.

Change-Id: I1e75dd40d7b8bf47ca4120f33c70f1ee452ba7b1
Signed-off-by: Elliot Berman <[email protected]>
This commit is contained in:
Elliot Berman 2020-03-20 10:09:26 -07:00
commit 78c7d9e598
1 changed files with 12 additions and 2 deletions
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14
drivers/virt/haven/hh_rm_core.c
View file

@ -54,6 +54,7 @@ static struct hh_msgq_desc *hh_rm_msgq_desc;
static DEFINE_MUTEX(hh_rm_call_idr_lock);
static DEFINE_IDR(hh_rm_call_idr);
static struct hh_rm_connection *curr_connection;
static DEFINE_MUTEX(hh_rm_send_lock);
static DEFINE_IDA(hh_rm_free_virq_ida);
static struct device_node *hh_rm_intc;
@ -501,6 +502,10 @@ static int hh_rm_send_request(u32 message_id,
return -E2BIG;
}
if (mutex_lock_interruptible(&hh_rm_send_lock)) {
return -ERESTARTSYS;
}
/* Consider also the 'request' packet for the loop count */
for (i = 0; i <= num_fragments; i++) {
if (buff_size_remaining > HH_RM_MAX_MSG_SIZE_BYTES) {
@ -511,8 +516,10 @@ static int hh_rm_send_request(u32 message_id,
}
send_buff = kzalloc(sizeof(*hdr) + payload_size, GFP_KERNEL);
if (!send_buff)
if (!send_buff) {
mutex_unlock(&hh_rm_send_lock);
return -ENOMEM;
}
hdr = send_buff;
hdr->version = HH_RM_RPC_HDR_VERSION_ONE;
@ -541,10 +548,13 @@ static int hh_rm_send_request(u32 message_id,
*/
kfree(send_buff);
if (ret)
if (ret) {
mutex_unlock(&hh_rm_send_lock);
return ret;
}
}
mutex_unlock(&hh_rm_send_lock);
return 0;
}