From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EC1D9C48BE7 for ; Thu, 27 Jun 2019 18:49:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D999F20B7C for ; Thu, 27 Jun 2019 18:49:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726614AbfF0St4 (ORCPT ); Thu, 27 Jun 2019 14:49:56 -0400 Received: from ale.deltatee.com ([207.54.116.67]:39894 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726465AbfF0St4 (ORCPT ); Thu, 27 Jun 2019 14:49:56 -0400 Received: from s01061831bf6ec98c.cg.shawcable.net ([68.147.80.180] helo=[192.168.6.132]) by ale.deltatee.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1hgZSz-0004rJ-D3; Thu, 27 Jun 2019 12:49:54 -0600 To: Christoph Hellwig , Dan Williams , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Jason Gunthorpe , Ben Skeggs Cc: linux-nvdimm@lists.01.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, nouveau@lists.freedesktop.org References: <20190626122724.13313-1-hch@lst.de> <20190626122724.13313-18-hch@lst.de> From: Logan Gunthorpe Message-ID: <580609fd-5ef2-bae4-e8f8-adc1eb0314a1@deltatee.com> Date: Thu, 27 Jun 2019 12:49:47 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190626122724.13313-18-hch@lst.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 68.147.80.180 X-SA-Exim-Rcpt-To: nouveau@lists.freedesktop.org, linux-mm@kvack.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-nvdimm@lists.01.org, bskeggs@redhat.com, jgg@mellanox.com, jglisse@redhat.com, dan.j.williams@intel.com, hch@lst.de X-SA-Exim-Mail-From: logang@deltatee.com Subject: Re: [PATCH 17/25] PCI/P2PDMA: use the dev_pagemap internal refcount X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2019-06-26 6:27 a.m., Christoph Hellwig wrote: > The functionality is identical to the one currently open coded in > p2pdma.c. > > Signed-off-by: Christoph Hellwig Reviewed-by: Logan Gunthorpe Also, for the P2PDMA changes in this series: Tested-by: Logan Gunthorpe I've ran this series through my simple P2PDMA tests. Logan > --- > drivers/pci/p2pdma.c | 57 ++++---------------------------------------- > 1 file changed, 4 insertions(+), 53 deletions(-) > > diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c > index ebd8ce3bba2e..608f84df604a 100644 > --- a/drivers/pci/p2pdma.c > +++ b/drivers/pci/p2pdma.c > @@ -24,12 +24,6 @@ struct pci_p2pdma { > bool p2pmem_published; > }; > > -struct p2pdma_pagemap { > - struct dev_pagemap pgmap; > - struct percpu_ref ref; > - struct completion ref_done; > -}; > - > static ssize_t size_show(struct device *dev, struct device_attribute *attr, > char *buf) > { > @@ -78,32 +72,6 @@ static const struct attribute_group p2pmem_group = { > .name = "p2pmem", > }; > > -static struct p2pdma_pagemap *to_p2p_pgmap(struct percpu_ref *ref) > -{ > - return container_of(ref, struct p2pdma_pagemap, ref); > -} > - > -static void pci_p2pdma_percpu_release(struct percpu_ref *ref) > -{ > - struct p2pdma_pagemap *p2p_pgmap = to_p2p_pgmap(ref); > - > - complete(&p2p_pgmap->ref_done); > -} > - > -static void pci_p2pdma_percpu_kill(struct dev_pagemap *pgmap) > -{ > - percpu_ref_kill(pgmap->ref); > -} > - > -static void pci_p2pdma_percpu_cleanup(struct dev_pagemap *pgmap) > -{ > - struct p2pdma_pagemap *p2p_pgmap = > - container_of(pgmap, struct p2pdma_pagemap, pgmap); > - > - wait_for_completion(&p2p_pgmap->ref_done); > - percpu_ref_exit(&p2p_pgmap->ref); > -} > - > static void pci_p2pdma_release(void *data) > { > struct pci_dev *pdev = data; > @@ -153,11 +121,6 @@ static int pci_p2pdma_setup(struct pci_dev *pdev) > return error; > } > > -static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = { > - .kill = pci_p2pdma_percpu_kill, > - .cleanup = pci_p2pdma_percpu_cleanup, > -}; > - > /** > * pci_p2pdma_add_resource - add memory for use as p2p memory > * @pdev: the device to add the memory to > @@ -171,7 +134,6 @@ static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = { > int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, > u64 offset) > { > - struct p2pdma_pagemap *p2p_pgmap; > struct dev_pagemap *pgmap; > void *addr; > int error; > @@ -194,26 +156,15 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, > return error; > } > > - p2p_pgmap = devm_kzalloc(&pdev->dev, sizeof(*p2p_pgmap), GFP_KERNEL); > - if (!p2p_pgmap) > + pgmap = devm_kzalloc(&pdev->dev, sizeof(*pgmap), GFP_KERNEL); > + if (!pgmap) > return -ENOMEM; > - > - init_completion(&p2p_pgmap->ref_done); > - error = percpu_ref_init(&p2p_pgmap->ref, > - pci_p2pdma_percpu_release, 0, GFP_KERNEL); > - if (error) > - goto pgmap_free; > - > - pgmap = &p2p_pgmap->pgmap; > - > pgmap->res.start = pci_resource_start(pdev, bar) + offset; > pgmap->res.end = pgmap->res.start + size - 1; > pgmap->res.flags = pci_resource_flags(pdev, bar); > - pgmap->ref = &p2p_pgmap->ref; > pgmap->type = MEMORY_DEVICE_PCI_P2PDMA; > pgmap->pci_p2pdma_bus_offset = pci_bus_address(pdev, bar) - > pci_resource_start(pdev, bar); > - pgmap->ops = &pci_p2pdma_pagemap_ops; > > addr = devm_memremap_pages(&pdev->dev, pgmap); > if (IS_ERR(addr)) { > @@ -224,7 +175,7 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, > error = gen_pool_add_owner(pdev->p2pdma->pool, (unsigned long)addr, > pci_bus_address(pdev, bar) + offset, > resource_size(&pgmap->res), dev_to_node(&pdev->dev), > - &p2p_pgmap->ref); > + pgmap->ref); > if (error) > goto pages_free; > > @@ -236,7 +187,7 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, > pages_free: > devm_memunmap_pages(&pdev->dev, pgmap); > pgmap_free: > - devm_kfree(&pdev->dev, p2p_pgmap); > + devm_kfree(&pdev->dev, pgmap); > return error; > } > EXPORT_SYMBOL_GPL(pci_p2pdma_add_resource); >