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Mon, 20 Apr 2020 16:27:48 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 222A4C4478C; Mon, 20 Apr 2020 16:27:47 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: saiprakash.ranjan) by smtp.codeaurora.org (Postfix) with ESMTPSA id 50479C433CB; Mon, 20 Apr 2020 16:27:46 +0000 (UTC) MIME-Version: 1.0 Date: Mon, 20 Apr 2020 21:57:46 +0530 From: Sai Prakash Ranjan To: Robin Murphy Subject: Re: [PATCHv2 3/6] iommu/arm-smmu: Implement iommu_ops->def_domain_type call-back In-Reply-To: <6dd26176-448a-985c-90fc-7c47088015ff@arm.com> References: <558b1aee4c699a0a5b14b325178d22a79958488f.1587392905.git.saiprakash.ranjan@codeaurora.org> <6dd26176-448a-985c-90fc-7c47088015ff@arm.com> Message-ID: <10cac2a08ae90afc88cbadff53a41ec5@codeaurora.org> X-Sender: saiprakash.ranjan@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200420_092751_080811_655825F8 X-CRM114-Status: GOOD ( 15.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, Joerg Roedel , Jordan Crouse , Evan Green , Bjorn Andersson , Rob Clark , iommu@lists.linux-foundation.org, Sibi Sankar , Stephen Boyd , Will Deacon , Matthias Kaehlcke , linux-kernel@vger.kernel.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Robin, On 2020-04-20 20:56, Robin Murphy wrote: > On 2020-04-20 3:37 pm, Sai Prakash Ranjan wrote: >> Implement the new def_domain_type call-back for the ARM >> SMMU driver. We need this to support requesting the domain >> type by the client devices. >> >> Signed-off-by: Sai Prakash Ranjan >> --- >> drivers/iommu/arm-smmu.c | 20 ++++++++++++++++++++ >> 1 file changed, 20 insertions(+) >> >> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c >> index e622f4e33379..b5d1d52dfbb8 100644 >> --- a/drivers/iommu/arm-smmu.c >> +++ b/drivers/iommu/arm-smmu.c >> @@ -1609,6 +1609,25 @@ static void arm_smmu_get_resv_regions(struct >> device *dev, >> iommu_dma_get_resv_regions(dev, head); >> } >> +static int arm_smmu_def_domain_type(struct device *dev) >> +{ >> + struct iommu_fwspec *fwspec; >> + struct arm_smmu_device *smmu; >> + >> + fwspec = dev_iommu_fwspec_get(dev); >> + if (!fwspec || fwspec->ops != &arm_smmu_ops) >> + return -ENODEV; >> + >> + smmu = arm_smmu_get_by_fwnode(fwspec->iommu_fwnode); >> + if (!smmu) >> + return -ENODEV; >> + > > AFAICS this should only ever be called for a device in a group, which > means an initial ->probe_device has succeeded and rather than > defensively going the long way round, we can safely assume this: > > struct arm_smmu_master_cfg = dev_iommu_priv_get(dev); > struct arm_smmu_impl *impl = cfg->smmu->impl; > > if (impl && impl->req_domain) > return impl->req_domain(dev); > Yes you are right, will use this. Thanks, Sai -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel