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Wed, 11 Nov 2020 05:58:08 -0800 (PST) Date: Wed, 11 Nov 2020 14:57:50 +0100 From: Jean-Philippe Brucker To: Xiang Zheng Subject: Re: [PATCH v7 04/24] iommu: Add a page fault handler Message-ID: <20201111135750.GA2617489@myrica> References: <20200519175502.2504091-1-jean-philippe@linaro.org> <20200519175502.2504091-5-jean-philippe@linaro.org> <422e84da-9ccb-5452-8cbf-f472d2ad16b5@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <422e84da-9ccb-5452-8cbf-f472d2ad16b5@huawei.com> Cc: devicetree@vger.kernel.org, kevin.tian@intel.com, will@kernel.org, fenghua.yu@intel.com, jgg@ziepe.ca, linux-pci@vger.kernel.org, christian.koenig@amd.com, hch@infradead.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Wang Haibin , catalin.marinas@arm.com, zhangfei.gao@linaro.org, robin.murphy@arm.com, felix.kuehling@amd.com, linux-arm-kernel@lists.infradead.org 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-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Hi Xiang, Thank you for reviewing this. I forgot to send a reply, sorry for the delay. On Fri, May 29, 2020 at 05:18:27PM +0800, Xiang Zheng wrote: > Hi, > > On 2020/5/20 1:54, Jean-Philippe Brucker wrote: > > Some systems allow devices to handle I/O Page Faults in the core mm. For > > example systems implementing the PCIe PRI extension or Arm SMMU stall > > model. Infrastructure for reporting these recoverable page faults was > > added to the IOMMU core by commit 0c830e6b3282 ("iommu: Introduce device > > fault report API"). Add a page fault handler for host SVA. > > > > IOMMU driver can now instantiate several fault workqueues and link them > > to IOPF-capable devices. Drivers can choose between a single global > > workqueue, one per IOMMU device, one per low-level fault queue, one per > > domain, etc. > > > > When it receives a fault event, supposedly in an IRQ handler, the IOMMU > > driver reports the fault using iommu_report_device_fault(), which calls > > the registered handler. The page fault handler then calls the mm fault > > handler, and reports either success or failure with iommu_page_response(). > > When the handler succeeded, the IOMMU retries the access. > > > > The iopf_param pointer could be embedded into iommu_fault_param. But > > putting iopf_param into the iommu_param structure allows us not to care > > about ordering between calls to iopf_queue_add_device() and > > iommu_register_device_fault_handler(). > > > > Signed-off-by: Jean-Philippe Brucker [...] > > +/** > > + * iopf_queue_free - Free IOPF queue > > + * @queue: queue to free > > + * > > + * Counterpart to iopf_queue_alloc(). The driver must not be queuing faults or > > + * adding/removing devices on this queue anymore. > > + */ > > +void iopf_queue_free(struct iopf_queue *queue) > > +{ > > + struct iopf_device_param *iopf_param, *next; > > + > > + if (!queue) > > + return; > > + > > + list_for_each_entry_safe(iopf_param, next, &queue->devices, queue_list) > > + iopf_queue_remove_device(queue, iopf_param->dev); > > + > > + destroy_workqueue(queue->wq); > > Do we need to free iopf_group(s) here in case the work queue of the group(s) are not > scheduled yet? If that occurs, we might leak memory here. Partial groups are freed by iopf_queue_remove_device(), and all other groups are freed when destroy_workqueue() executes the remaining work. Thanks, Jean _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu