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[142.162.113.129]) by smtp.gmail.com with ESMTPSA id g5-20020ac87d05000000b002f940249151sm3165272qtb.73.2022.05.27.05.55.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 May 2022 05:55:02 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1nuZUb-00DTYK-OD; Fri, 27 May 2022 09:55:01 -0300 Date: Fri, 27 May 2022 09:55:01 -0300 From: Jason Gunthorpe To: Logan Gunthorpe Cc: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Stephen Bates , Christoph Hellwig , Dan Williams , Christian =?utf-8?B?S8O2bmln?= , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Jakowski Andrzej , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Bjorn Helgaas , Ira Weiny , Robin Murphy , Martin Oliveira , Chaitanya Kulkarni , Ralph Campbell , Bjorn Helgaas Subject: Re: [PATCH v6 20/21] PCI/P2PDMA: Introduce pci_mmap_p2pmem() Message-ID: <20220527125501.GD2960187@ziepe.ca> References: <20220407154717.7695-1-logang@deltatee.com> <20220407154717.7695-21-logang@deltatee.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220407154717.7695-21-logang@deltatee.com> X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: F11A920051 X-Stat-Signature: 41zzjhyyg3ebisysrus88o75ha5ozrne Authentication-Results: imf31.hostedemail.com; dkim=pass header.d=ziepe.ca header.s=google header.b=E1IEYVgS; dmarc=none; spf=pass (imf31.hostedemail.com: domain of jgg@ziepe.ca designates 209.85.222.179 as permitted sender) smtp.mailfrom=jgg@ziepe.ca X-Rspam-User: X-HE-Tag: 1653656066-947234 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Apr 07, 2022 at 09:47:16AM -0600, Logan Gunthorpe wrote: > +static void pci_p2pdma_unmap_mappings(void *data) > +{ > + struct pci_dev *pdev = data; > + struct pci_p2pdma *p2pdma = rcu_dereference_protected(pdev->p2pdma, 1); > + > + /* Ensure no new pages can be allocated in mappings */ > + p2pdma->active = false; > + synchronize_rcu(); > + > + unmap_mapping_range(p2pdma->inode->i_mapping, 0, 0, 1); > + > + /* > + * On some architectures, TLB flushes are done with call_rcu() > + * so to ensure GUP fast is done with the pages, call synchronize_rcu() > + * before freeing them. > + */ > + synchronize_rcu(); > + pci_p2pdma_free_mappings(p2pdma->inode->i_mapping); With the series from Felix getting close this should get updated to not set pte_devmap and use proper natural refcounting without any of this stuff. Jason