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Peter Anvin" , x86@kernel.org, Liran Alon , Nikita Leshenko , Barret Rhoden , Boris Ostrovsky , Matthew Wilcox , Konrad Rzeszutek Wilk Subject: [PATCH RFC 08/10] dax/pmem: Add device-dax support for PFN_MODE_NONE Date: Fri, 10 Jan 2020 19:03:11 +0000 Message-Id: <20200110190313.17144-9-joao.m.martins@oracle.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20200110190313.17144-1-joao.m.martins@oracle.com> References: <20200110190313.17144-1-joao.m.martins@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9496 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001100154 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9496 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001100154 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: Allowing dax pmem driver to work without struct pages means that user will request to not create any PFN metadata by writing seed's device mode to PFN_MODE_NONE. When the underlying nd_pfn->mode is PFN_MODE_NONE, most dax_pmem initialization steps can be skipped because we won't have/need a pfn superblock for the pagemap/struct-pages. We only allocate an opaque zeroed object with the chosen align requested, and finally add PFN_SPECIAL to the region pfn_flags. Signed-off-by: Joao Martins --- drivers/dax/pmem/core.c | 36 ++++++++++++++++++++++++++++++------ 1 file changed, 30 insertions(+), 6 deletions(-) diff --git a/drivers/dax/pmem/core.c b/drivers/dax/pmem/core.c index 2bedf8414fff..67f5604a8291 100644 --- a/drivers/dax/pmem/core.c +++ b/drivers/dax/pmem/core.c @@ -17,15 +17,38 @@ struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys) struct nd_namespace_io *nsio; struct dax_region *dax_region; struct dev_pagemap pgmap = { }; + struct dev_pagemap *devmap = NULL; struct nd_namespace_common *ndns; struct nd_dax *nd_dax = to_nd_dax(dev); struct nd_pfn *nd_pfn = &nd_dax->nd_pfn; struct nd_region *nd_region = to_nd_region(dev->parent); + unsigned long long pfn_flags = PFN_DEV; ndns = nvdimm_namespace_common_probe(dev); if (IS_ERR(ndns)) return ERR_CAST(ndns); + rc = sscanf(dev_name(&ndns->dev), "namespace%d.%d", ®ion_id, &id); + if (rc != 2) + return ERR_PTR(-EINVAL); + + if (is_nd_dax(&nd_pfn->dev) && nd_pfn->mode == PFN_MODE_NONE) { + /* allocate a dummy super block */ + pfn_sb = devm_kzalloc(&nd_pfn->dev, sizeof(*pfn_sb), + GFP_KERNEL); + if (!pfn_sb) + return ERR_PTR(-ENOMEM); + + memset(pfn_sb, 0, sizeof(*pfn_sb)); + pfn_sb->align = nd_pfn->align; + nd_pfn->pfn_sb = pfn_sb; + pfn_flags |= PFN_SPECIAL; + + nsio = to_nd_namespace_io(&ndns->dev); + memcpy(&res, &nsio->res, sizeof(res)); + goto no_pfn_sb; + } + /* parse the 'pfn' info block via ->rw_bytes */ rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve()); if (rc) @@ -45,20 +68,21 @@ struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys) return ERR_PTR(-EBUSY); } - rc = sscanf(dev_name(&ndns->dev), "namespace%d.%d", ®ion_id, &id); - if (rc != 2) - return ERR_PTR(-EINVAL); - /* adjust the dax_region resource to the start of data */ memcpy(&res, &pgmap.res, sizeof(res)); res.start += offset; + devmap = &pgmap; + pfn_flags |= PFN_MAP; + +no_pfn_sb: dax_region = alloc_dax_region(dev, region_id, &res, nd_region->target_node, le32_to_cpu(pfn_sb->align), - PFN_DEV|PFN_MAP); + pfn_flags); if (!dax_region) return ERR_PTR(-ENOMEM); - dev_dax = __devm_create_dev_dax(dax_region, id, &pgmap, subsys); + + dev_dax = __devm_create_dev_dax(dax_region, id, devmap, subsys); /* child dev_dax instances now own the lifetime of the dax_region */ dax_region_put(dax_region);