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drivers: nvme: Add precheck and delay for CQE pending status.

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To workaroud the NVMe I/O timeout problem in bootup S10udev case
which caused by the CQE update lantancy.

Signed-off-by: Kevin.xie <kevin.xie@starfivetech.com>
This commit is contained in:
Kevin.xie 2022-11-24 16:59:12 +08:00 • committed by Hal Feng
parent 139867421b
commit c0855d2d61
1 changed files with 10 additions and 0 deletions
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10
drivers/nvme/host/pci.c
View file

@ -28,6 +28,7 @@
#include <linux/io-64-nonatomic-hi-lo.h>
#include <linux/sed-opal.h>
#include <linux/pci-p2pdma.h>
#include <linux/delay.h>
#include "trace.h"
#include "nvme.h"
@ -1060,6 +1061,15 @@ static inline int nvme_poll_cq(struct nvme_queue *nvmeq,
{
int found = 0;
/*
* In some cases, such as udev trigger, cqe status may update
* a little bit later than MSI, which cause an irq handle missing.
* To workaound, here we will prefetch the status first, and wait
* 1us if we get nothing.
*/
if (!nvme_cqe_pending(nvmeq))
udelay(1);
while (nvme_cqe_pending(nvmeq)) {
found++;
/*