From patchwork Wed Jun 5 21:59:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 10977995 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 DEC596C5 for ; Wed, 5 Jun 2019 22:13:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CD9DE21BED for ; Wed, 5 Jun 2019 22:13:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C0A3C2890A; Wed, 5 Jun 2019 22:13:24 +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=-2.9 required=2.0 tests=BAYES_00,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 B8F6121BED for ; Wed, 5 Jun 2019 22:13:23 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id ABC93212909D9; Wed, 5 Jun 2019 15:13:23 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=192.55.52.88; helo=mga01.intel.com; envelope-from=dan.j.williams@intel.com; receiver=linux-nvdimm@lists.01.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) (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 811712128DD59 for ; Wed, 5 Jun 2019 15:13:21 -0700 (PDT) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Jun 2019 15:13:21 -0700 X-ExtLoop1: 1 Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.16]) by fmsmga007.fm.intel.com with ESMTP; 05 Jun 2019 15:13:20 -0700 Subject: [PATCH v9 12/12] libnvdimm/pfn: Stop padding pmem namespaces to section alignment From: Dan Williams To: akpm@linux-foundation.org Date: Wed, 05 Jun 2019 14:59:04 -0700 Message-ID: <155977194407.2443951.14077225226024648760.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <155977186863.2443951.9036044808311959913.stgit@dwillia2-desk3.amr.corp.intel.com> References: <155977186863.2443951.9036044808311959913.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-2-gc94f MIME-Version: 1.0 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: mhocko@suse.com, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, osalvador@suse.de Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP Now that the mm core supports section-unaligned hotplug of ZONE_DEVICE memory, we no longer need to add padding at pfn/dax device creation time. The kernel will still honor padding established by older kernels. Reported-by: Jeff Moyer Signed-off-by: Dan Williams --- drivers/nvdimm/pfn.h | 14 -------- drivers/nvdimm/pfn_devs.c | 77 ++++++++------------------------------------- include/linux/mmzone.h | 3 ++ 3 files changed, 16 insertions(+), 78 deletions(-) diff --git a/drivers/nvdimm/pfn.h b/drivers/nvdimm/pfn.h index e901e3a3b04c..cc042a98758f 100644 --- a/drivers/nvdimm/pfn.h +++ b/drivers/nvdimm/pfn.h @@ -41,18 +41,4 @@ struct nd_pfn_sb { __le64 checksum; }; -#ifdef CONFIG_SPARSEMEM -#define PFN_SECTION_ALIGN_DOWN(x) SECTION_ALIGN_DOWN(x) -#define PFN_SECTION_ALIGN_UP(x) SECTION_ALIGN_UP(x) -#else -/* - * In this case ZONE_DEVICE=n and we will disable 'pfn' device support, - * but we still want pmem to compile. - */ -#define PFN_SECTION_ALIGN_DOWN(x) (x) -#define PFN_SECTION_ALIGN_UP(x) (x) -#endif - -#define PHYS_SECTION_ALIGN_DOWN(x) PFN_PHYS(PFN_SECTION_ALIGN_DOWN(PHYS_PFN(x))) -#define PHYS_SECTION_ALIGN_UP(x) PFN_PHYS(PFN_SECTION_ALIGN_UP(PHYS_PFN(x))) #endif /* __NVDIMM_PFN_H */ diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c index a2406253eb70..7f54374b082f 100644 --- a/drivers/nvdimm/pfn_devs.c +++ b/drivers/nvdimm/pfn_devs.c @@ -595,14 +595,14 @@ static u32 info_block_reserve(void) } /* - * We hotplug memory at section granularity, pad the reserved area from - * the previous section base to the namespace base address. + * We hotplug memory at sub-section granularity, pad the reserved area + * from the previous section base to the namespace base address. */ static unsigned long init_altmap_base(resource_size_t base) { unsigned long base_pfn = PHYS_PFN(base); - return PFN_SECTION_ALIGN_DOWN(base_pfn); + return SUBSECTION_ALIGN_DOWN(base_pfn); } static unsigned long init_altmap_reserve(resource_size_t base) @@ -610,7 +610,7 @@ static unsigned long init_altmap_reserve(resource_size_t base) unsigned long reserve = info_block_reserve() >> PAGE_SHIFT; unsigned long base_pfn = PHYS_PFN(base); - reserve += base_pfn - PFN_SECTION_ALIGN_DOWN(base_pfn); + reserve += base_pfn - SUBSECTION_ALIGN_DOWN(base_pfn); return reserve; } @@ -641,8 +641,7 @@ static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap) nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns); pgmap->altmap_valid = false; } else if (nd_pfn->mode == PFN_MODE_PMEM) { - nd_pfn->npfns = PFN_SECTION_ALIGN_UP((resource_size(res) - - offset) / PAGE_SIZE); + nd_pfn->npfns = PHYS_PFN((resource_size(res) - offset)); if (le64_to_cpu(nd_pfn->pfn_sb->npfns) > nd_pfn->npfns) dev_info(&nd_pfn->dev, "number of pfns truncated from %lld to %ld\n", @@ -658,54 +657,14 @@ static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap) return 0; } -static u64 phys_pmem_align_down(struct nd_pfn *nd_pfn, u64 phys) -{ - return min_t(u64, PHYS_SECTION_ALIGN_DOWN(phys), - ALIGN_DOWN(phys, nd_pfn->align)); -} - -/* - * Check if pmem collides with 'System RAM', or other regions when - * section aligned. Trim it accordingly. - */ -static void trim_pfn_device(struct nd_pfn *nd_pfn, u32 *start_pad, u32 *end_trunc) -{ - struct nd_namespace_common *ndns = nd_pfn->ndns; - struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); - struct nd_region *nd_region = to_nd_region(nd_pfn->dev.parent); - const resource_size_t start = nsio->res.start; - const resource_size_t end = start + resource_size(&nsio->res); - resource_size_t adjust, size; - - *start_pad = 0; - *end_trunc = 0; - - adjust = start - PHYS_SECTION_ALIGN_DOWN(start); - size = resource_size(&nsio->res) + adjust; - if (region_intersects(start - adjust, size, IORESOURCE_SYSTEM_RAM, - IORES_DESC_NONE) == REGION_MIXED - || nd_region_conflict(nd_region, start - adjust, size)) - *start_pad = PHYS_SECTION_ALIGN_UP(start) - start; - - /* Now check that end of the range does not collide. */ - adjust = PHYS_SECTION_ALIGN_UP(end) - end; - size = resource_size(&nsio->res) + adjust; - if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM, - IORES_DESC_NONE) == REGION_MIXED - || !IS_ALIGNED(end, nd_pfn->align) - || nd_region_conflict(nd_region, start, size)) - *end_trunc = end - phys_pmem_align_down(nd_pfn, end); -} - static int nd_pfn_init(struct nd_pfn *nd_pfn) { struct nd_namespace_common *ndns = nd_pfn->ndns; struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); - u32 start_pad, end_trunc, reserve = info_block_reserve(); resource_size_t start, size; struct nd_region *nd_region; + unsigned long npfns, align; struct nd_pfn_sb *pfn_sb; - unsigned long npfns; phys_addr_t offset; const char *sig; u64 checksum; @@ -736,43 +695,35 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn) return -ENXIO; } - memset(pfn_sb, 0, sizeof(*pfn_sb)); - - trim_pfn_device(nd_pfn, &start_pad, &end_trunc); - if (start_pad + end_trunc) - dev_info(&nd_pfn->dev, "%s alignment collision, truncate %d bytes\n", - dev_name(&ndns->dev), start_pad + end_trunc); - /* * Note, we use 64 here for the standard size of struct page, * debugging options may cause it to be larger in which case the * implementation will limit the pfns advertised through * ->direct_access() to those that are included in the memmap. */ - start = nsio->res.start + start_pad; + start = nsio->res.start; size = resource_size(&nsio->res); - npfns = PFN_SECTION_ALIGN_UP((size - start_pad - end_trunc - reserve) - / PAGE_SIZE); + npfns = PHYS_PFN(size - SZ_8K); + align = max(nd_pfn->align, (1UL << SUBSECTION_SHIFT)); if (nd_pfn->mode == PFN_MODE_PMEM) { /* * The altmap should be padded out to the block size used * when populating the vmemmap. This *should* be equal to * PMD_SIZE for most architectures. */ - offset = ALIGN(start + reserve + 64 * npfns, - max(nd_pfn->align, PMD_SIZE)) - start; + offset = ALIGN(start + SZ_8K + 64 * npfns, align) - start; } else if (nd_pfn->mode == PFN_MODE_RAM) - offset = ALIGN(start + reserve, nd_pfn->align) - start; + offset = ALIGN(start + SZ_8K, align) - start; else return -ENXIO; - if (offset + start_pad + end_trunc >= size) { + if (offset >= size) { dev_err(&nd_pfn->dev, "%s unable to satisfy requested alignment\n", dev_name(&ndns->dev)); return -ENXIO; } - npfns = (size - offset - start_pad - end_trunc) / SZ_4K; + npfns = PHYS_PFN(size - offset); pfn_sb->mode = cpu_to_le32(nd_pfn->mode); pfn_sb->dataoff = cpu_to_le64(offset); pfn_sb->npfns = cpu_to_le64(npfns); @@ -781,8 +732,6 @@ static int nd_pfn_init(struct nd_pfn *nd_pfn) memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16); pfn_sb->version_major = cpu_to_le16(1); pfn_sb->version_minor = cpu_to_le16(3); - pfn_sb->start_pad = cpu_to_le32(start_pad); - pfn_sb->end_trunc = cpu_to_le32(end_trunc); pfn_sb->align = cpu_to_le32(nd_pfn->align); checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb); pfn_sb->checksum = cpu_to_le64(checksum); diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 49e7fb452dfd..15e07f007ba2 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -1181,6 +1181,9 @@ static inline unsigned long section_nr_to_pfn(unsigned long sec) #define SUBSECTIONS_PER_SECTION (1UL << (SECTION_SIZE_BITS - SUBSECTION_SHIFT)) #endif +#define SUBSECTION_ALIGN_UP(pfn) ALIGN((pfn), PAGES_PER_SUBSECTION) +#define SUBSECTION_ALIGN_DOWN(pfn) ((pfn) & PAGE_SUBSECTION_MASK) + struct mem_section_usage { DECLARE_BITMAP(subsection_map, SUBSECTIONS_PER_SECTION); /* See declaration of similar field in struct zone */