hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I97CSY

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In kdump kernel, the ECMDQ is enabled before and cannot be reset before it is disabled. This leads to "CMD_SYNC timeout" problem.

Disable the ECMDQ before reset the ECMDQ to fix.

Signed-off-by: Wang Wensheng wangwensheng4@huawei.com --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index 9b9fff633546..fe647241ca88 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -4608,6 +4608,20 @@ static int arm_smmu_ecmdq_reset(struct arm_smmu_device *smmu) q->llq.prod = 0; q->llq.cons = 0; } + + reg = readl(q->prod_reg); + if (reg & ECMDQ_PROD_EN) { + /* disable ecmdq */ + writel(reg & ~ECMDQ_PROD_EN, q->prod_reg); + ret = readl_relaxed_poll_timeout(q->cons_reg, reg, + !(reg & ECMDQ_CONS_ENACK), 1, ARM_SMMU_POLL_TIMEOUT_US); + if (ret) { + dev_warn(smmu->dev, "ecmdq[%d] disable failed\n", i); + smmu->ecmdq_enabled = 0; + return ret; + } + } + writeq_relaxed(q->q_base, ecmdq->base + ARM_SMMU_ECMDQ_BASE); writel_relaxed(q->llq.prod, ecmdq->base + ARM_SMMU_ECMDQ_PROD); writel_relaxed(q->llq.cons, ecmdq->base + ARM_SMMU_ECMDQ_CONS);