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Wed, 11 Aug 2021 12:15:51 +0100 Subject: Re: [PATCH RFC 2/8] iommu/arm-smmu-v3: Add and use static helper function arm_smmu_cmdq_issue_cmd_with_sync() To: Will Deacon References: <20210626110130.2416-1-thunder.leizhen@huawei.com> <20210626110130.2416-3-thunder.leizhen@huawei.com> <20210810182454.GB3296@willie-the-truck> <20210811100905.GB4426@willie-the-truck> <20210811103344.GA4736@willie-the-truck> From: John Garry Message-ID: <1dcf5fe0-6ae0-2df6-9d2a-bda6a4f885ac@huawei.com> Date: Wed, 11 Aug 2021 12:15:14 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1 MIME-Version: 1.0 In-Reply-To: <20210811103344.GA4736@willie-the-truck> Content-Language: en-US X-Originating-IP: [10.47.80.4] X-ClientProxiedBy: lhreml712-chm.china.huawei.com (10.201.108.63) To lhreml724-chm.china.huawei.com (10.201.108.75) X-CFilter-Loop: Reflected Cc: iommu , Robin Murphy , linux-kernel , linux-arm-kernel X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" >>>>>> >>>>>> Therefore, function arm_smmu_cmdq_issue_cmd_with_sync() is added to insert >>>>>> the 'cmd+sync' commands at a time. >>>>>> >>>>>> Signed-off-by: Zhen Lei >>>>>> --- >>>>>> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 33 +++++++++++++-------- >>>>>> 1 file changed, 21 insertions(+), 12 deletions(-) >>>>>> >>>>>> 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 2433d3c29b49ff2..a5361153ca1d6a4 100644 >>>>>> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c >>>>>> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c >>>>>> @@ -858,11 +858,25 @@ static int arm_smmu_cmdq_issue_cmd(struct arm_smmu_device *smmu, >>>>>> return arm_smmu_cmdq_issue_cmdlist(smmu, cmd, 1, false); >>>>>> } >>>>>> -static int arm_smmu_cmdq_issue_sync(struct arm_smmu_device *smmu) >>>>>> +static int __maybe_unused arm_smmu_cmdq_issue_sync(struct arm_smmu_device *smmu) >>>>>> { >>>>>> return arm_smmu_cmdq_issue_cmdlist(smmu, NULL, 0, true); >>>>>> } >>>>>> +static int arm_smmu_cmdq_issue_cmd_with_sync(struct arm_smmu_device *smmu, >>>>>> + struct arm_smmu_cmdq_ent *ent) >>>>>> +{ >>>>>> + u64 cmd[CMDQ_ENT_DWORDS]; >>>>>> + >>>>>> + if (arm_smmu_cmdq_build_cmd(cmd, ent)) { >>>>>> + dev_warn(smmu->dev, "ignoring unknown CMDQ opcode 0x%x\n", >>>>>> + ent->opcode); >>>>>> + return -EINVAL; >> Are any of the errors returned from the "issue command" functions actually >> consumed? I couldn't see it on mainline code from a brief browse. > I don't think so. I don't think so either. > Can we actually propagate them? There does appear to be some places, here's one I found: arm_smmu_page_response() -> arm_smmu_cmdq_issue_cmd(), and arm_smmu_page_response is set to arm_smmu_ops.page_response, which returns an int Thanks, John _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu