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[Qemu-devel] [PATCH v4 3/3] block/nvme: don't touch the completion entri
From: |
Maxim Levitsky |
Subject: |
[Qemu-devel] [PATCH v4 3/3] block/nvme: don't touch the completion entries |
Date: |
Tue, 16 Jul 2019 19:30:20 +0300 |
Completion entries are meant to be only read by the host and written by the
device.
The driver is supposed to scan the completions from the last point where it
left,
and until it sees a completion with non flipped phase bit.
Signed-off-by: Maxim Levitsky <address@hidden>
Reviewed-by: Max Reitz <address@hidden>
---
block/nvme.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/block/nvme.c b/block/nvme.c
index 35ce10dc79..c28755cc31 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -318,7 +318,7 @@ static bool nvme_process_completion(BDRVNVMeState *s,
NVMeQueuePair *q)
while (q->inflight) {
int16_t cid;
c = (NvmeCqe *)&q->cq.queue[q->cq.head * NVME_CQ_ENTRY_BYTES];
- if (!c->cid || (le16_to_cpu(c->status) & 0x1) == q->cq_phase) {
+ if ((le16_to_cpu(c->status) & 0x1) == q->cq_phase) {
break;
}
q->cq.head = (q->cq.head + 1) % NVME_QUEUE_SIZE;
@@ -342,10 +342,7 @@ static bool nvme_process_completion(BDRVNVMeState *s,
NVMeQueuePair *q)
qemu_mutex_unlock(&q->lock);
req.cb(req.opaque, nvme_translate_error(c));
qemu_mutex_lock(&q->lock);
- c->cid = cpu_to_le16(0);
q->inflight--;
- /* Flip Phase Tag bit. */
- c->status = cpu_to_le16(le16_to_cpu(c->status) ^ 0x1);
progress = true;
}
if (progress) {
--
2.17.2