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06 Jan 2022 16:36:14 -0800 Subject: Re: [PATCH v1 6/8] gpu/host1x: Use iommu_attach/detach_device() To: Jason Gunthorpe References: <20220106022053.2406748-1-baolu.lu@linux.intel.com> <20220106022053.2406748-7-baolu.lu@linux.intel.com> <20220106153543.GD2328285@nvidia.com> From: Lu Baolu Message-ID: <2befad17-05fe-3768-6fbb-67440a5befa3@linux.intel.com> Date: Fri, 7 Jan 2022 08:35:34 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: <20220106153543.GD2328285@nvidia.com> Content-Language: en-US Cc: Stuart Yoder , rafael@kernel.org, David Airlie , linux-pci@vger.kernel.org, Thierry Reding , Diana Craciun , Dmitry Osipenko , Will Deacon , Ashok Raj , Jonathan Hunter , Christoph Hellwig , Kevin Tian , Chaitanya Kulkarni , Alex Williamson , kvm@vger.kernel.org, Bjorn Helgaas , Dan Williams , Greg Kroah-Hartman , Cornelia Huck , linux-kernel@vger.kernel.org, Li Yang , iommu@lists.linux-foundation.org, Jacob jun Pan , Daniel Vetter , Robin Murphy 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" On 1/6/22 11:35 PM, Jason Gunthorpe wrote: > On Thu, Jan 06, 2022 at 10:20:51AM +0800, Lu Baolu wrote: >> Ordinary drivers should use iommu_attach/detach_device() for domain >> attaching and detaching. >> >> Signed-off-by: Lu Baolu >> drivers/gpu/host1x/dev.c | 4 ++-- >> 1 file changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c >> index fbb6447b8659..6e08cb6202cc 100644 >> +++ b/drivers/gpu/host1x/dev.c >> @@ -265,7 +265,7 @@ static struct iommu_domain *host1x_iommu_attach(struct host1x *host) >> goto put_cache; >> } >> >> - err = iommu_attach_group(host->domain, host->group); >> + err = iommu_attach_device(host->domain, host->dev); >> if (err) { >> if (err == -ENODEV) >> err = 0; >> @@ -335,7 +335,7 @@ static void host1x_iommu_exit(struct host1x *host) >> { >> if (host->domain) { >> put_iova_domain(&host->iova); >> - iommu_detach_group(host->domain, host->group); >> + iommu_detach_device(host->domain, host->dev); >> >> iommu_domain_free(host->domain); >> host->domain = NULL; > > Shouldn't this add the flag to tegra_host1x_driver ? This is called for a single driver. The call trace looks like below: static struct platform_driver tegra_host1x_driver = { .driver = { .name = "tegra-host1x", .of_match_table = host1x_of_match, }, .probe = host1x_probe, .remove = host1x_remove, }; host1x_probe(dev) ->host1x_iommu_init(host) //host is a wrapper of dev -->host1x_iommu_attach(host) ---->iommu_group_get(host->dev) iommu_domain_alloc(&platform_bus_type) iommu_attach_group(domain, group); It seems that the existing code only works for singleton group. > > And do like we did in the other tegra stuff and switch to the dma api > when !host1x_wants_iommu() ? > > Jason > Best regards, baolu _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu