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linux/drivers/nvdimm/pfn.h

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libnvdimm, pfn: 'struct page' provider infrastructure Implement the base infrastructure for libnvdimm PFN devices. Similar to BTT devices they take a namespace as a backing device and layer functionality on top. In this case the functionality is reserving space for an array of 'struct page' entries to be handed out through pfn_to_page(). For now this is just the basic libnvdimm-device-model for configuring the base PFN device. As the namespace claiming mechanism for PFN devices is mostly identical to BTT devices drivers/nvdimm/claim.c is created to house the common bits. Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2015-07-30 23:57:47 +02:00
/*
* Copyright (c) 2014-2015, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#ifndef __NVDIMM_PFN_H
#define __NVDIMM_PFN_H
#include <linux/types.h>
libnvdimm, pmem: fix 'pfn' support for section-misaligned namespaces The altmap for a section-misaligned namespace needs to arrange for the base_pfn to be section-aligned. As a result the 'reserve' region (pfns from base that do not have a struct page) must be increased. Otherwise we trip the altmap validation check in __add_pages: if (altmap->base_pfn != phys_start_pfn || vmem_altmap_offset(altmap) > nr_pages) { pr_warn_once("memory add fail, invalid altmap\n"); return -EINVAL; } Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2016-03-03 18:14:36 +01:00
#include <linux/mmzone.h>
libnvdimm, pfn: 'struct page' provider infrastructure Implement the base infrastructure for libnvdimm PFN devices. Similar to BTT devices they take a namespace as a backing device and layer functionality on top. In this case the functionality is reserving space for an array of 'struct page' entries to be handed out through pfn_to_page(). For now this is just the basic libnvdimm-device-model for configuring the base PFN device. As the namespace claiming mechanism for PFN devices is mostly identical to BTT devices drivers/nvdimm/claim.c is created to house the common bits. Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2015-07-30 23:57:47 +02:00
#define PFN_SIG_LEN 16
#define PFN_SIG "NVDIMM_PFN_INFO\0"
struct nd_pfn_sb {
u8 signature[PFN_SIG_LEN];
u8 uuid[16];
u8 parent_uuid[16];
__le32 flags;
__le16 version_major;
__le16 version_minor;
__le64 dataoff;
__le64 npfns;
__le32 mode;
u8 padding[4012];
__le64 checksum;
};
libnvdimm, pmem: fix 'pfn' support for section-misaligned namespaces The altmap for a section-misaligned namespace needs to arrange for the base_pfn to be section-aligned. As a result the 'reserve' region (pfns from base that do not have a struct page) must be increased. Otherwise we trip the altmap validation check in __add_pages: if (altmap->base_pfn != phys_start_pfn || vmem_altmap_offset(altmap) > nr_pages) { pr_warn_once("memory add fail, invalid altmap\n"); return -EINVAL; } Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2016-03-03 18:14:36 +01:00
#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
libnvdimm, pfn: 'struct page' provider infrastructure Implement the base infrastructure for libnvdimm PFN devices. Similar to BTT devices they take a namespace as a backing device and layer functionality on top. In this case the functionality is reserving space for an array of 'struct page' entries to be handed out through pfn_to_page(). For now this is just the basic libnvdimm-device-model for configuring the base PFN device. As the namespace claiming mechanism for PFN devices is mostly identical to BTT devices drivers/nvdimm/claim.c is created to house the common bits. Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2015-07-30 23:57:47 +02:00
#endif /* __NVDIMM_PFN_H */