From patchwork Fri Aug 16 06:54:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11096847 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 65F6B1398 for ; Fri, 16 Aug 2019 06:54:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 53B57289CF for ; Fri, 16 Aug 2019 06:54:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 478D0289D4; Fri, 16 Aug 2019 06:54:49 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C6CCC289CF for ; Fri, 16 Aug 2019 06:54:48 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id CF985202C80BC; Thu, 15 Aug 2019 23:56:40 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: None (no SPF record) identity=mailfrom; client-ip=2607:7c80:54:e::133; helo=bombadil.infradead.org; envelope-from=batv+66fbed4ec5b4f711ea06+5836+infradead.org+hch@bombadil.srs.infradead.org; receiver=linux-nvdimm@lists.01.org Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 38AD0202BB9AB for ; Thu, 15 Aug 2019 23:56:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=b+a4pr26YNInd7/QhhzGzYpG1NEGvVch+LojSapMZZc=; b=q/BjrqiWxleujKZgKtvVwFD29i R1mYmGsd81RuGdIsBX2zKNbj6gTbsMekpGNZO1BfZY1yUTlE4y+R82pgKreWjAdZ3TPCN0qBPGpoz Tfmt3anDfnQQARogPDVC7yBNqwsk2KI2E6ryzuthV8Uriij1gwSy78oFMuRXMYNlF7GsE+Q5ukray IHZ7+1jsYG5AzIQHb2CC9qNjXfK14t4IHXUtVAF4KQueFuZChZjNoT86j3hyi5fntsJ9Nzoa7Xitb UNjeECi/IsqsIsdD7R4uqxzS5cwwXK50ol0ncpX7KdBddMgGniAH6y1yxQlNfkx7YU0T+dCfMDrMc qZKHsfBg==; Received: from [2001:4bb8:18c:28b5:44f9:d544:957f:32cb] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hyW8I-0008HF-Su; Fri, 16 Aug 2019 06:54:43 +0000 From: Christoph Hellwig To: Dan Williams , Jason Gunthorpe Subject: [PATCH 1/4] resource: add a not device managed request_free_mem_region variant Date: Fri, 16 Aug 2019 08:54:31 +0200 Message-Id: <20190816065434.2129-2-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190816065434.2129-1-hch@lst.de> References: <20190816065434.2129-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mm@kvack.org, Andrew Morton , linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, Bharata B Rao Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP Just add a simple macro that passes a NULL dev argument to dev_request_free_mem_region, and call request_mem_region in the function for that particular case. Signed-off-by: Christoph Hellwig --- include/linux/ioport.h | 2 ++ kernel/resource.c | 45 +++++++++++++++++++++++++++++------------- 2 files changed, 33 insertions(+), 14 deletions(-) diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 5b6a7121c9f0..7bddddfc76d6 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -297,6 +297,8 @@ static inline bool resource_overlaps(struct resource *r1, struct resource *r2) struct resource *devm_request_free_mem_region(struct device *dev, struct resource *base, unsigned long size); +struct resource *request_free_mem_region(struct resource *base, + unsigned long size, const char *name); #endif /* __ASSEMBLY__ */ #endif /* _LINUX_IOPORT_H */ diff --git a/kernel/resource.c b/kernel/resource.c index 7ea4306503c5..74877e9d90ca 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -1644,19 +1644,8 @@ void resource_list_free(struct list_head *head) EXPORT_SYMBOL(resource_list_free); #ifdef CONFIG_DEVICE_PRIVATE -/** - * devm_request_free_mem_region - find free region for device private memory - * - * @dev: device struct to bind the resource to - * @size: size in bytes of the device memory to add - * @base: resource tree to look in - * - * This function tries to find an empty range of physical address big enough to - * contain the new resource, so that it can later be hotplugged as ZONE_DEVICE - * memory, which in turn allocates struct pages. - */ -struct resource *devm_request_free_mem_region(struct device *dev, - struct resource *base, unsigned long size) +static struct resource *__request_free_mem_region(struct device *dev, + struct resource *base, unsigned long size, const char *name) { resource_size_t end, addr; struct resource *res; @@ -1670,7 +1659,10 @@ struct resource *devm_request_free_mem_region(struct device *dev, REGION_DISJOINT) continue; - res = devm_request_mem_region(dev, addr, size, dev_name(dev)); + if (dev) + res = devm_request_mem_region(dev, addr, size, name); + else + res = request_mem_region(addr, size, name); if (!res) return ERR_PTR(-ENOMEM); res->desc = IORES_DESC_DEVICE_PRIVATE_MEMORY; @@ -1679,7 +1671,32 @@ struct resource *devm_request_free_mem_region(struct device *dev, return ERR_PTR(-ERANGE); } + +/** + * devm_request_free_mem_region - find free region for device private memory + * + * @dev: device struct to bind the resource to + * @size: size in bytes of the device memory to add + * @base: resource tree to look in + * + * This function tries to find an empty range of physical address big enough to + * contain the new resource, so that it can later be hotplugged as ZONE_DEVICE + * memory, which in turn allocates struct pages. + */ +struct resource *devm_request_free_mem_region(struct device *dev, + struct resource *base, unsigned long size) +{ + return __request_free_mem_region(dev, base, size, dev_name(dev)); +} EXPORT_SYMBOL_GPL(devm_request_free_mem_region); + +struct resource *request_free_mem_region(struct resource *base, + unsigned long size, const char *name) +{ + return __request_free_mem_region(NULL, base, size, name); +} +EXPORT_SYMBOL_GPL(request_free_mem_region); + #endif /* CONFIG_DEVICE_PRIVATE */ static int __init strict_iomem(char *str) From patchwork Fri Aug 16 06:54:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11096853 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 57CCE56FE for ; Fri, 16 Aug 2019 06:54:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4623C289CF for ; Fri, 16 Aug 2019 06:54:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 39ED7289D4; 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Fri, 16 Aug 2019 06:54:46 +0000 From: Christoph Hellwig To: Dan Williams , Jason Gunthorpe Subject: [PATCH 2/4] memremap: remove the dev field in struct dev_pagemap Date: Fri, 16 Aug 2019 08:54:32 +0200 Message-Id: <20190816065434.2129-3-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190816065434.2129-1-hch@lst.de> References: <20190816065434.2129-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mm@kvack.org, Andrew Morton , linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, Bharata B Rao Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP The dev field in struct dev_pagemap is only used to print dev_name in two places, which are at best nice to have. Just remove the field and thus the name in those two messages. Signed-off-by: Christoph Hellwig --- include/linux/memremap.h | 1 - mm/memremap.c | 6 +----- mm/page_alloc.c | 2 +- 3 files changed, 2 insertions(+), 7 deletions(-) diff --git a/include/linux/memremap.h b/include/linux/memremap.h index f8a5b2a19945..8f0013e18e14 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -109,7 +109,6 @@ struct dev_pagemap { struct percpu_ref *ref; struct percpu_ref internal_ref; struct completion done; - struct device *dev; enum memory_type type; unsigned int flags; u64 pci_p2pdma_bus_offset; diff --git a/mm/memremap.c b/mm/memremap.c index 86432650f829..416b4129acbb 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -102,7 +102,6 @@ static void dev_pagemap_cleanup(struct dev_pagemap *pgmap) static void devm_memremap_pages_release(void *data) { struct dev_pagemap *pgmap = data; - struct device *dev = pgmap->dev; struct resource *res = &pgmap->res; unsigned long pfn; int nid; @@ -129,8 +128,7 @@ static void devm_memremap_pages_release(void *data) untrack_pfn(NULL, PHYS_PFN(res->start), resource_size(res)); pgmap_array_delete(res); - dev_WARN_ONCE(dev, pgmap->altmap.alloc, - "%s: failed to free all reserved pages\n", __func__); + WARN_ONCE(pgmap->altmap.alloc, "failed to free all reserved pages\n"); } static void dev_pagemap_percpu_release(struct percpu_ref *ref) @@ -251,8 +249,6 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) goto err_array; } - pgmap->dev = dev; - error = xa_err(xa_store_range(&pgmap_array, PHYS_PFN(res->start), PHYS_PFN(res->end), pgmap, GFP_KERNEL)); if (error) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 272c6de1bf4e..b39baa2b1faf 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5982,7 +5982,7 @@ void __ref memmap_init_zone_device(struct zone *zone, } } - pr_info("%s initialised, %lu pages in %ums\n", dev_name(pgmap->dev), + pr_info("%s initialised %lu pages in %ums\n", __func__, size, jiffies_to_msecs(jiffies - start)); } From patchwork Fri Aug 16 06:54:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11096855 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 762811398 for ; 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client-ip=2607:7c80:54:e::133; helo=bombadil.infradead.org; envelope-from=batv+66fbed4ec5b4f711ea06+5836+infradead.org+hch@bombadil.srs.infradead.org; receiver=linux-nvdimm@lists.01.org Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 119A9202E291C for ; Thu, 15 Aug 2019 23:56:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=tXcE1XGfAjBldp4qZPqG6onLgHm1jEyfgSiznWOouFY=; b=I3T8QraOQoXLX7b/3Lnh/DGNnY 0Lo8ks5Flw6fLn8VtJSnb6371a63J3dg/ngEtGCdAP3hO3S2xSjjMgjCApwx5dU0AoitlgMZ8BcN1 TNz8sL2XwZ7ZWL6X86A2rGJbcWyOx3OfM5lu4tXtuYa/jgA+rAJcM1oSD2Fpv7cksDCgUJC/fn9Kq nTAiST3Dnx0BeidJNl39SLSRug9Wcm6I4KcVLRaKNMWlFNVLoynlTpYBVLH114vG62z0+eRGKTfvN biBEvbSMgMzXSstGo8fHxOrdnwa/1RwqGz+5oEpCIvgTw0FvnwHhrfWzzmrI3E17qFXjN1l8el6bE tD/zuFow==; Received: from [2001:4bb8:18c:28b5:44f9:d544:957f:32cb] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hyW8O-0008Hc-Qe; Fri, 16 Aug 2019 06:54:49 +0000 From: Christoph Hellwig To: Dan Williams , Jason Gunthorpe Subject: [PATCH 3/4] memremap: don't use a separate devm action for devmap_managed_enable_get Date: Fri, 16 Aug 2019 08:54:33 +0200 Message-Id: <20190816065434.2129-4-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190816065434.2129-1-hch@lst.de> References: <20190816065434.2129-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mm@kvack.org, Andrew Morton , linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, Bharata B Rao Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP Just clean up for early failures and then piggy back on devm_memremap_pages_release. This helps with a pending not device managed version of devm_memremap_pages. Signed-off-by: Christoph Hellwig --- mm/memremap.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/mm/memremap.c b/mm/memremap.c index 416b4129acbb..4e11da4ecab9 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -21,13 +21,13 @@ DEFINE_STATIC_KEY_FALSE(devmap_managed_key); EXPORT_SYMBOL(devmap_managed_key); static atomic_t devmap_managed_enable; -static void devmap_managed_enable_put(void *data) +static void devmap_managed_enable_put(void) { if (atomic_dec_and_test(&devmap_managed_enable)) static_branch_disable(&devmap_managed_key); } -static int devmap_managed_enable_get(struct device *dev, struct dev_pagemap *pgmap) +static int devmap_managed_enable_get(struct dev_pagemap *pgmap) { if (!pgmap->ops || !pgmap->ops->page_free) { WARN(1, "Missing page_free method\n"); @@ -36,13 +36,16 @@ static int devmap_managed_enable_get(struct device *dev, struct dev_pagemap *pgm if (atomic_inc_return(&devmap_managed_enable) == 1) static_branch_enable(&devmap_managed_key); - return devm_add_action_or_reset(dev, devmap_managed_enable_put, NULL); + return 0; } #else -static int devmap_managed_enable_get(struct device *dev, struct dev_pagemap *pgmap) +static int devmap_managed_enable_get(struct dev_pagemap *pgmap) { return -EINVAL; } +static void devmap_managed_enable_put(void) +{ +} #endif /* CONFIG_DEV_PAGEMAP_OPS */ static void pgmap_array_delete(struct resource *res) @@ -129,6 +132,7 @@ static void devm_memremap_pages_release(void *data) untrack_pfn(NULL, PHYS_PFN(res->start), resource_size(res)); pgmap_array_delete(res); WARN_ONCE(pgmap->altmap.alloc, "failed to free all reserved pages\n"); + devmap_managed_enable_put(); } static void dev_pagemap_percpu_release(struct percpu_ref *ref) @@ -218,7 +222,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) } if (need_devmap_managed) { - error = devmap_managed_enable_get(dev, pgmap); + error = devmap_managed_enable_get(pgmap); if (error) return ERR_PTR(error); } @@ -327,6 +331,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) err_array: dev_pagemap_kill(pgmap); dev_pagemap_cleanup(pgmap); + devmap_managed_enable_put(); return ERR_PTR(error); } EXPORT_SYMBOL_GPL(devm_memremap_pages); From patchwork Fri Aug 16 06:54:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11096859 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B70FE14F7 for ; Fri, 16 Aug 2019 06:54:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A3D4F289CF for ; Fri, 16 Aug 2019 06:54:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 97426289D4; Fri, 16 Aug 2019 06:54:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 18551289CF for ; Fri, 16 Aug 2019 06:54:57 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 1F015202E291C; Thu, 15 Aug 2019 23:56:49 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: None (no SPF record) identity=mailfrom; client-ip=2607:7c80:54:e::133; helo=bombadil.infradead.org; envelope-from=batv+66fbed4ec5b4f711ea06+5836+infradead.org+hch@bombadil.srs.infradead.org; receiver=linux-nvdimm@lists.01.org Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id D3EAC202BB9AB for ; Thu, 15 Aug 2019 23:56:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=YFr/r1WuSTNnE+OoNkjNf7rF5XlC5mR260Fl41QkQtk=; b=ScVOhPczdoQh3syfKvqiHDyb1v jJtMUtelYGfsTjCkQb5HfKS7wb8XT5N8KY02z4QsvqIZp3TgnLkUeK32IAudoaO0d61J/gnViDM1b RIxKBXUiB4iRMEEPX6+D2bcTFUxDVKzWIhRZjEMKygaAgix7Wofw1xEtKYoGrTlBlNlYQ2U/gb8vP +sxPK6xFJKYg8eN9u4lhUVpy4B0dljq0CnHFu+KAR71lqOhmxuq8N14XGj2WK58Gh8/P+QJezepP8 qcUqfw13++G/pqXpLKkeYWyNgAVLsmU1lX3QxQQB4PQdJIko51aWFCQzqtwBoSQX1dyZQ7KyDUK/Y HhJZEzkw==; Received: from [2001:4bb8:18c:28b5:44f9:d544:957f:32cb] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hyW8R-0008I8-TD; Fri, 16 Aug 2019 06:54:52 +0000 From: Christoph Hellwig To: Dan Williams , Jason Gunthorpe Subject: [PATCH 4/4] memremap: provide a not device managed memremap_pages Date: Fri, 16 Aug 2019 08:54:34 +0200 Message-Id: <20190816065434.2129-5-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190816065434.2129-1-hch@lst.de> References: <20190816065434.2129-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mm@kvack.org, Andrew Morton , linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, Bharata B Rao Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP The kvmppc ultravisor code wants a device private memory pool that is system wide and not attached to a device. Instead of faking up one provide a low-level memremap_pages for it. Note that this function is not exported, and doesn't have a cleanup routine associated with it to discourage use from more driver like users. Signed-off-by: Christoph Hellwig --- include/linux/memremap.h | 2 + mm/memremap.c | 84 +++++++++++++++++++++++++--------------- 2 files changed, 54 insertions(+), 32 deletions(-) diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 8f0013e18e14..fb2a0bd826b9 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -123,6 +123,8 @@ static inline struct vmem_altmap *pgmap_altmap(struct dev_pagemap *pgmap) } #ifdef CONFIG_ZONE_DEVICE +void *memremap_pages(struct dev_pagemap *pgmap, int nid); +void memunmap_pages(struct dev_pagemap *pgmap); void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap); void devm_memunmap_pages(struct device *dev, struct dev_pagemap *pgmap); struct dev_pagemap *get_dev_pagemap(unsigned long pfn, diff --git a/mm/memremap.c b/mm/memremap.c index 4e11da4ecab9..9e163fe367ae 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -102,9 +102,8 @@ static void dev_pagemap_cleanup(struct dev_pagemap *pgmap) pgmap->ref = NULL; } -static void devm_memremap_pages_release(void *data) +void memunmap_pages(struct dev_pagemap *pgmap) { - struct dev_pagemap *pgmap = data; struct resource *res = &pgmap->res; unsigned long pfn; int nid; @@ -134,6 +133,12 @@ static void devm_memremap_pages_release(void *data) WARN_ONCE(pgmap->altmap.alloc, "failed to free all reserved pages\n"); devmap_managed_enable_put(); } +EXPORT_SYMBOL_GPL(memunmap_pages); + +static void devm_memremap_pages_release(void *data) +{ + memunmap_pages(data); +} static void dev_pagemap_percpu_release(struct percpu_ref *ref) { @@ -143,27 +148,12 @@ static void dev_pagemap_percpu_release(struct percpu_ref *ref) complete(&pgmap->done); } -/** - * devm_memremap_pages - remap and provide memmap backing for the given resource - * @dev: hosting device for @res - * @pgmap: pointer to a struct dev_pagemap - * - * Notes: - * 1/ At a minimum the res and type members of @pgmap must be initialized - * by the caller before passing it to this function - * - * 2/ The altmap field may optionally be initialized, in which case - * PGMAP_ALTMAP_VALID must be set in pgmap->flags. - * - * 3/ The ref field may optionally be provided, in which pgmap->ref must be - * 'live' on entry and will be killed and reaped at - * devm_memremap_pages_release() time, or if this routine fails. - * - * 4/ res is expected to be a host memory range that could feasibly be - * treated as a "System RAM" range, i.e. not a device mmio range, but - * this is not enforced. +/* + * Not device managed version of dev_memremap_pages, undone by + * memunmap_pages(). Please use dev_memremap_pages if you have a struct + * device available. */ -void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) +void *memremap_pages(struct dev_pagemap *pgmap, int nid) { struct resource *res = &pgmap->res; struct dev_pagemap *conflict_pgmap; @@ -174,7 +164,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) .altmap = pgmap_altmap(pgmap), }; pgprot_t pgprot = PAGE_KERNEL; - int error, nid, is_ram; + int error, is_ram; bool need_devmap_managed = true; switch (pgmap->type) { @@ -229,7 +219,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) conflict_pgmap = get_dev_pagemap(PHYS_PFN(res->start), NULL); if (conflict_pgmap) { - dev_WARN(dev, "Conflicting mapping in same section\n"); + WARN(1, "Conflicting mapping in same section\n"); put_dev_pagemap(conflict_pgmap); error = -ENOMEM; goto err_array; @@ -237,7 +227,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) conflict_pgmap = get_dev_pagemap(PHYS_PFN(res->end), NULL); if (conflict_pgmap) { - dev_WARN(dev, "Conflicting mapping in same section\n"); + WARN(1, "Conflicting mapping in same section\n"); put_dev_pagemap(conflict_pgmap); error = -ENOMEM; goto err_array; @@ -258,7 +248,6 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) if (error) goto err_array; - nid = dev_to_node(dev); if (nid < 0) nid = numa_mem_id(); @@ -314,12 +303,6 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) PHYS_PFN(res->start), PHYS_PFN(resource_size(res)), pgmap); percpu_ref_get_many(pgmap->ref, pfn_end(pgmap) - pfn_first(pgmap)); - - error = devm_add_action_or_reset(dev, devm_memremap_pages_release, - pgmap); - if (error) - return ERR_PTR(error); - return __va(res->start); err_add_memory: @@ -334,6 +317,43 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) devmap_managed_enable_put(); return ERR_PTR(error); } +EXPORT_SYMBOL_GPL(memremap_pages); + +/** + * devm_memremap_pages - remap and provide memmap backing for the given resource + * @dev: hosting device for @res + * @pgmap: pointer to a struct dev_pagemap + * + * Notes: + * 1/ At a minimum the res and type members of @pgmap must be initialized + * by the caller before passing it to this function + * + * 2/ The altmap field may optionally be initialized, in which case + * PGMAP_ALTMAP_VALID must be set in pgmap->flags. + * + * 3/ The ref field may optionally be provided, in which pgmap->ref must be + * 'live' on entry and will be killed and reaped at + * devm_memremap_pages_release() time, or if this routine fails. + * + * 4/ res is expected to be a host memory range that could feasibly be + * treated as a "System RAM" range, i.e. not a device mmio range, but + * this is not enforced. + */ +void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) +{ + int error; + void *ret; + + ret = memremap_pages(pgmap, dev_to_node(dev)); + if (IS_ERR(ret)) + return ret; + + error = devm_add_action_or_reset(dev, devm_memremap_pages_release, + pgmap); + if (error) + return ERR_PTR(error); + return ret; +} EXPORT_SYMBOL_GPL(devm_memremap_pages); void devm_memunmap_pages(struct device *dev, struct dev_pagemap *pgmap)