![Dan Williams](/assets/img/avatar_default.png)
For warnings that should only ever trigger during development and testing replace WARN statements with lockdep_assert_held. The lockdep pattern is prevalent, and these paths are are well covered by libnvdimm unit tests. Reported-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
986 lines
25 KiB
C
986 lines
25 KiB
C
/*
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/scatterlist.h>
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#include <linux/highmem.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/hash.h>
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#include <linux/pmem.h>
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#include <linux/sort.h>
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#include <linux/io.h>
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#include <linux/nd.h>
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#include "nd-core.h"
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#include "nd.h"
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/*
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* For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is
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* irrelevant.
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*/
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#include <linux/io-64-nonatomic-hi-lo.h>
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static DEFINE_IDA(region_ida);
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static DEFINE_PER_CPU(int, flush_idx);
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static int nvdimm_map_flush(struct device *dev, struct nvdimm *nvdimm, int dimm,
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struct nd_region_data *ndrd)
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{
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int i, j;
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dev_dbg(dev, "%s: map %d flush address%s\n", nvdimm_name(nvdimm),
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nvdimm->num_flush, nvdimm->num_flush == 1 ? "" : "es");
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for (i = 0; i < (1 << ndrd->hints_shift); i++) {
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struct resource *res = &nvdimm->flush_wpq[i];
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unsigned long pfn = PHYS_PFN(res->start);
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void __iomem *flush_page;
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/* check if flush hints share a page */
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for (j = 0; j < i; j++) {
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struct resource *res_j = &nvdimm->flush_wpq[j];
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unsigned long pfn_j = PHYS_PFN(res_j->start);
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if (pfn == pfn_j)
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break;
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}
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if (j < i)
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flush_page = (void __iomem *) ((unsigned long)
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ndrd_get_flush_wpq(ndrd, dimm, j)
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& PAGE_MASK);
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else
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flush_page = devm_nvdimm_ioremap(dev,
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PFN_PHYS(pfn), PAGE_SIZE);
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if (!flush_page)
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return -ENXIO;
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ndrd_set_flush_wpq(ndrd, dimm, i, flush_page
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+ (res->start & ~PAGE_MASK));
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}
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return 0;
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}
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int nd_region_activate(struct nd_region *nd_region)
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{
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int i, j, num_flush = 0;
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struct nd_region_data *ndrd;
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struct device *dev = &nd_region->dev;
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size_t flush_data_size = sizeof(void *);
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nvdimm_bus_lock(&nd_region->dev);
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for (i = 0; i < nd_region->ndr_mappings; i++) {
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struct nd_mapping *nd_mapping = &nd_region->mapping[i];
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struct nvdimm *nvdimm = nd_mapping->nvdimm;
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/* at least one null hint slot per-dimm for the "no-hint" case */
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flush_data_size += sizeof(void *);
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num_flush = min_not_zero(num_flush, nvdimm->num_flush);
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if (!nvdimm->num_flush)
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continue;
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flush_data_size += nvdimm->num_flush * sizeof(void *);
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}
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nvdimm_bus_unlock(&nd_region->dev);
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ndrd = devm_kzalloc(dev, sizeof(*ndrd) + flush_data_size, GFP_KERNEL);
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if (!ndrd)
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return -ENOMEM;
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dev_set_drvdata(dev, ndrd);
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if (!num_flush)
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return 0;
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ndrd->hints_shift = ilog2(num_flush);
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for (i = 0; i < nd_region->ndr_mappings; i++) {
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struct nd_mapping *nd_mapping = &nd_region->mapping[i];
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struct nvdimm *nvdimm = nd_mapping->nvdimm;
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int rc = nvdimm_map_flush(&nd_region->dev, nvdimm, i, ndrd);
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if (rc)
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return rc;
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}
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/*
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* Clear out entries that are duplicates. This should prevent the
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* extra flushings.
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*/
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for (i = 0; i < nd_region->ndr_mappings - 1; i++) {
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/* ignore if NULL already */
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if (!ndrd_get_flush_wpq(ndrd, i, 0))
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continue;
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for (j = i + 1; j < nd_region->ndr_mappings; j++)
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if (ndrd_get_flush_wpq(ndrd, i, 0) ==
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ndrd_get_flush_wpq(ndrd, j, 0))
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ndrd_set_flush_wpq(ndrd, j, 0, NULL);
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}
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return 0;
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}
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static void nd_region_release(struct device *dev)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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u16 i;
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for (i = 0; i < nd_region->ndr_mappings; i++) {
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struct nd_mapping *nd_mapping = &nd_region->mapping[i];
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struct nvdimm *nvdimm = nd_mapping->nvdimm;
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put_device(&nvdimm->dev);
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}
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free_percpu(nd_region->lane);
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ida_simple_remove(®ion_ida, nd_region->id);
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if (is_nd_blk(dev))
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kfree(to_nd_blk_region(dev));
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else
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kfree(nd_region);
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}
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static struct device_type nd_blk_device_type = {
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.name = "nd_blk",
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.release = nd_region_release,
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};
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static struct device_type nd_pmem_device_type = {
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.name = "nd_pmem",
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.release = nd_region_release,
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};
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static struct device_type nd_volatile_device_type = {
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.name = "nd_volatile",
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.release = nd_region_release,
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};
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bool is_nd_pmem(struct device *dev)
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{
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return dev ? dev->type == &nd_pmem_device_type : false;
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}
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bool is_nd_blk(struct device *dev)
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{
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return dev ? dev->type == &nd_blk_device_type : false;
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}
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struct nd_region *to_nd_region(struct device *dev)
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{
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struct nd_region *nd_region = container_of(dev, struct nd_region, dev);
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WARN_ON(dev->type->release != nd_region_release);
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return nd_region;
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}
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EXPORT_SYMBOL_GPL(to_nd_region);
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struct nd_blk_region *to_nd_blk_region(struct device *dev)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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WARN_ON(!is_nd_blk(dev));
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return container_of(nd_region, struct nd_blk_region, nd_region);
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}
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EXPORT_SYMBOL_GPL(to_nd_blk_region);
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void *nd_region_provider_data(struct nd_region *nd_region)
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{
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return nd_region->provider_data;
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}
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EXPORT_SYMBOL_GPL(nd_region_provider_data);
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void *nd_blk_region_provider_data(struct nd_blk_region *ndbr)
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{
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return ndbr->blk_provider_data;
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}
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EXPORT_SYMBOL_GPL(nd_blk_region_provider_data);
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void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data)
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{
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ndbr->blk_provider_data = data;
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}
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EXPORT_SYMBOL_GPL(nd_blk_region_set_provider_data);
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/**
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* nd_region_to_nstype() - region to an integer namespace type
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* @nd_region: region-device to interrogate
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*
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* This is the 'nstype' attribute of a region as well, an input to the
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* MODALIAS for namespace devices, and bit number for a nvdimm_bus to match
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* namespace devices with namespace drivers.
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*/
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int nd_region_to_nstype(struct nd_region *nd_region)
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{
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if (is_nd_pmem(&nd_region->dev)) {
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u16 i, alias;
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for (i = 0, alias = 0; i < nd_region->ndr_mappings; i++) {
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struct nd_mapping *nd_mapping = &nd_region->mapping[i];
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struct nvdimm *nvdimm = nd_mapping->nvdimm;
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if (nvdimm->flags & NDD_ALIASING)
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alias++;
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}
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if (alias)
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return ND_DEVICE_NAMESPACE_PMEM;
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else
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return ND_DEVICE_NAMESPACE_IO;
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} else if (is_nd_blk(&nd_region->dev)) {
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return ND_DEVICE_NAMESPACE_BLK;
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}
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return 0;
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}
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EXPORT_SYMBOL(nd_region_to_nstype);
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static ssize_t size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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unsigned long long size = 0;
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if (is_nd_pmem(dev)) {
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size = nd_region->ndr_size;
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} else if (nd_region->ndr_mappings == 1) {
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struct nd_mapping *nd_mapping = &nd_region->mapping[0];
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size = nd_mapping->size;
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}
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return sprintf(buf, "%llu\n", size);
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}
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static DEVICE_ATTR_RO(size);
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static ssize_t mappings_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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return sprintf(buf, "%d\n", nd_region->ndr_mappings);
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}
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static DEVICE_ATTR_RO(mappings);
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static ssize_t nstype_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
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}
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static DEVICE_ATTR_RO(nstype);
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static ssize_t set_cookie_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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struct nd_interleave_set *nd_set = nd_region->nd_set;
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if (is_nd_pmem(dev) && nd_set)
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/* pass, should be precluded by region_visible */;
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else
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return -ENXIO;
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return sprintf(buf, "%#llx\n", nd_set->cookie);
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}
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static DEVICE_ATTR_RO(set_cookie);
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resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
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{
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resource_size_t blk_max_overlap = 0, available, overlap;
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int i;
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WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
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retry:
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available = 0;
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overlap = blk_max_overlap;
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for (i = 0; i < nd_region->ndr_mappings; i++) {
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struct nd_mapping *nd_mapping = &nd_region->mapping[i];
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struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
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/* if a dimm is disabled the available capacity is zero */
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if (!ndd)
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return 0;
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if (is_nd_pmem(&nd_region->dev)) {
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available += nd_pmem_available_dpa(nd_region,
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nd_mapping, &overlap);
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if (overlap > blk_max_overlap) {
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blk_max_overlap = overlap;
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goto retry;
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}
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} else if (is_nd_blk(&nd_region->dev))
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available += nd_blk_available_dpa(nd_region);
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}
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return available;
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}
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static ssize_t available_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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unsigned long long available = 0;
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/*
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* Flush in-flight updates and grab a snapshot of the available
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* size. Of course, this value is potentially invalidated the
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* memory nvdimm_bus_lock() is dropped, but that's userspace's
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* problem to not race itself.
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*/
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nvdimm_bus_lock(dev);
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wait_nvdimm_bus_probe_idle(dev);
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available = nd_region_available_dpa(nd_region);
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nvdimm_bus_unlock(dev);
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return sprintf(buf, "%llu\n", available);
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}
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static DEVICE_ATTR_RO(available_size);
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static ssize_t init_namespaces_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_region_data *ndrd = dev_get_drvdata(dev);
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ssize_t rc;
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nvdimm_bus_lock(dev);
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if (ndrd)
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rc = sprintf(buf, "%d/%d\n", ndrd->ns_active, ndrd->ns_count);
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else
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rc = -ENXIO;
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nvdimm_bus_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RO(init_namespaces);
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static ssize_t namespace_seed_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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ssize_t rc;
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nvdimm_bus_lock(dev);
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if (nd_region->ns_seed)
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rc = sprintf(buf, "%s\n", dev_name(nd_region->ns_seed));
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else
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rc = sprintf(buf, "\n");
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nvdimm_bus_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RO(namespace_seed);
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static ssize_t btt_seed_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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ssize_t rc;
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nvdimm_bus_lock(dev);
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if (nd_region->btt_seed)
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rc = sprintf(buf, "%s\n", dev_name(nd_region->btt_seed));
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else
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rc = sprintf(buf, "\n");
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nvdimm_bus_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RO(btt_seed);
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static ssize_t pfn_seed_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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ssize_t rc;
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nvdimm_bus_lock(dev);
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if (nd_region->pfn_seed)
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rc = sprintf(buf, "%s\n", dev_name(nd_region->pfn_seed));
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else
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rc = sprintf(buf, "\n");
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nvdimm_bus_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RO(pfn_seed);
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static ssize_t dax_seed_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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ssize_t rc;
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nvdimm_bus_lock(dev);
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if (nd_region->dax_seed)
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rc = sprintf(buf, "%s\n", dev_name(nd_region->dax_seed));
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else
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rc = sprintf(buf, "\n");
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nvdimm_bus_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RO(dax_seed);
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static ssize_t read_only_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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return sprintf(buf, "%d\n", nd_region->ro);
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}
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static ssize_t read_only_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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bool ro;
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int rc = strtobool(buf, &ro);
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struct nd_region *nd_region = to_nd_region(dev);
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if (rc)
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return rc;
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nd_region->ro = ro;
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return len;
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}
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static DEVICE_ATTR_RW(read_only);
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static struct attribute *nd_region_attributes[] = {
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&dev_attr_size.attr,
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&dev_attr_nstype.attr,
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&dev_attr_mappings.attr,
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&dev_attr_btt_seed.attr,
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&dev_attr_pfn_seed.attr,
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&dev_attr_dax_seed.attr,
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&dev_attr_read_only.attr,
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&dev_attr_set_cookie.attr,
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&dev_attr_available_size.attr,
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&dev_attr_namespace_seed.attr,
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&dev_attr_init_namespaces.attr,
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NULL,
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};
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static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
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{
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struct device *dev = container_of(kobj, typeof(*dev), kobj);
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struct nd_region *nd_region = to_nd_region(dev);
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struct nd_interleave_set *nd_set = nd_region->nd_set;
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int type = nd_region_to_nstype(nd_region);
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if (!is_nd_pmem(dev) && a == &dev_attr_pfn_seed.attr)
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return 0;
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if (!is_nd_pmem(dev) && a == &dev_attr_dax_seed.attr)
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return 0;
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if (a != &dev_attr_set_cookie.attr
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&& a != &dev_attr_available_size.attr)
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return a->mode;
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if ((type == ND_DEVICE_NAMESPACE_PMEM
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|| type == ND_DEVICE_NAMESPACE_BLK)
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&& a == &dev_attr_available_size.attr)
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return a->mode;
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else if (is_nd_pmem(dev) && nd_set)
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return a->mode;
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return 0;
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}
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|
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struct attribute_group nd_region_attribute_group = {
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.attrs = nd_region_attributes,
|
|
.is_visible = region_visible,
|
|
};
|
|
EXPORT_SYMBOL_GPL(nd_region_attribute_group);
|
|
|
|
u64 nd_region_interleave_set_cookie(struct nd_region *nd_region)
|
|
{
|
|
struct nd_interleave_set *nd_set = nd_region->nd_set;
|
|
|
|
if (nd_set)
|
|
return nd_set->cookie;
|
|
return 0;
|
|
}
|
|
|
|
void nd_mapping_free_labels(struct nd_mapping *nd_mapping)
|
|
{
|
|
struct nd_label_ent *label_ent, *e;
|
|
|
|
lockdep_assert_held(&nd_mapping->lock);
|
|
list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
|
|
list_del(&label_ent->list);
|
|
kfree(label_ent);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Upon successful probe/remove, take/release a reference on the
|
|
* associated interleave set (if present), and plant new btt + namespace
|
|
* seeds. Also, on the removal of a BLK region, notify the provider to
|
|
* disable the region.
|
|
*/
|
|
static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
|
|
struct device *dev, bool probe)
|
|
{
|
|
struct nd_region *nd_region;
|
|
|
|
if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) {
|
|
int i;
|
|
|
|
nd_region = to_nd_region(dev);
|
|
for (i = 0; i < nd_region->ndr_mappings; i++) {
|
|
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
|
|
struct nvdimm_drvdata *ndd = nd_mapping->ndd;
|
|
struct nvdimm *nvdimm = nd_mapping->nvdimm;
|
|
|
|
mutex_lock(&nd_mapping->lock);
|
|
nd_mapping_free_labels(nd_mapping);
|
|
mutex_unlock(&nd_mapping->lock);
|
|
|
|
put_ndd(ndd);
|
|
nd_mapping->ndd = NULL;
|
|
if (ndd)
|
|
atomic_dec(&nvdimm->busy);
|
|
}
|
|
|
|
if (is_nd_pmem(dev))
|
|
return;
|
|
}
|
|
if (dev->parent && (is_nd_blk(dev->parent) || is_nd_pmem(dev->parent))
|
|
&& probe) {
|
|
nd_region = to_nd_region(dev->parent);
|
|
nvdimm_bus_lock(dev);
|
|
if (nd_region->ns_seed == dev)
|
|
nd_region_create_ns_seed(nd_region);
|
|
nvdimm_bus_unlock(dev);
|
|
}
|
|
if (is_nd_btt(dev) && probe) {
|
|
struct nd_btt *nd_btt = to_nd_btt(dev);
|
|
|
|
nd_region = to_nd_region(dev->parent);
|
|
nvdimm_bus_lock(dev);
|
|
if (nd_region->btt_seed == dev)
|
|
nd_region_create_btt_seed(nd_region);
|
|
if (nd_region->ns_seed == &nd_btt->ndns->dev)
|
|
nd_region_create_ns_seed(nd_region);
|
|
nvdimm_bus_unlock(dev);
|
|
}
|
|
if (is_nd_pfn(dev) && probe) {
|
|
struct nd_pfn *nd_pfn = to_nd_pfn(dev);
|
|
|
|
nd_region = to_nd_region(dev->parent);
|
|
nvdimm_bus_lock(dev);
|
|
if (nd_region->pfn_seed == dev)
|
|
nd_region_create_pfn_seed(nd_region);
|
|
if (nd_region->ns_seed == &nd_pfn->ndns->dev)
|
|
nd_region_create_ns_seed(nd_region);
|
|
nvdimm_bus_unlock(dev);
|
|
}
|
|
if (is_nd_dax(dev) && probe) {
|
|
struct nd_dax *nd_dax = to_nd_dax(dev);
|
|
|
|
nd_region = to_nd_region(dev->parent);
|
|
nvdimm_bus_lock(dev);
|
|
if (nd_region->dax_seed == dev)
|
|
nd_region_create_dax_seed(nd_region);
|
|
if (nd_region->ns_seed == &nd_dax->nd_pfn.ndns->dev)
|
|
nd_region_create_ns_seed(nd_region);
|
|
nvdimm_bus_unlock(dev);
|
|
}
|
|
}
|
|
|
|
void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev)
|
|
{
|
|
nd_region_notify_driver_action(nvdimm_bus, dev, true);
|
|
}
|
|
|
|
void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev)
|
|
{
|
|
nd_region_notify_driver_action(nvdimm_bus, dev, false);
|
|
}
|
|
|
|
static ssize_t mappingN(struct device *dev, char *buf, int n)
|
|
{
|
|
struct nd_region *nd_region = to_nd_region(dev);
|
|
struct nd_mapping *nd_mapping;
|
|
struct nvdimm *nvdimm;
|
|
|
|
if (n >= nd_region->ndr_mappings)
|
|
return -ENXIO;
|
|
nd_mapping = &nd_region->mapping[n];
|
|
nvdimm = nd_mapping->nvdimm;
|
|
|
|
return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev),
|
|
nd_mapping->start, nd_mapping->size);
|
|
}
|
|
|
|
#define REGION_MAPPING(idx) \
|
|
static ssize_t mapping##idx##_show(struct device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
return mappingN(dev, buf, idx); \
|
|
} \
|
|
static DEVICE_ATTR_RO(mapping##idx)
|
|
|
|
/*
|
|
* 32 should be enough for a while, even in the presence of socket
|
|
* interleave a 32-way interleave set is a degenerate case.
|
|
*/
|
|
REGION_MAPPING(0);
|
|
REGION_MAPPING(1);
|
|
REGION_MAPPING(2);
|
|
REGION_MAPPING(3);
|
|
REGION_MAPPING(4);
|
|
REGION_MAPPING(5);
|
|
REGION_MAPPING(6);
|
|
REGION_MAPPING(7);
|
|
REGION_MAPPING(8);
|
|
REGION_MAPPING(9);
|
|
REGION_MAPPING(10);
|
|
REGION_MAPPING(11);
|
|
REGION_MAPPING(12);
|
|
REGION_MAPPING(13);
|
|
REGION_MAPPING(14);
|
|
REGION_MAPPING(15);
|
|
REGION_MAPPING(16);
|
|
REGION_MAPPING(17);
|
|
REGION_MAPPING(18);
|
|
REGION_MAPPING(19);
|
|
REGION_MAPPING(20);
|
|
REGION_MAPPING(21);
|
|
REGION_MAPPING(22);
|
|
REGION_MAPPING(23);
|
|
REGION_MAPPING(24);
|
|
REGION_MAPPING(25);
|
|
REGION_MAPPING(26);
|
|
REGION_MAPPING(27);
|
|
REGION_MAPPING(28);
|
|
REGION_MAPPING(29);
|
|
REGION_MAPPING(30);
|
|
REGION_MAPPING(31);
|
|
|
|
static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int n)
|
|
{
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
|
struct nd_region *nd_region = to_nd_region(dev);
|
|
|
|
if (n < nd_region->ndr_mappings)
|
|
return a->mode;
|
|
return 0;
|
|
}
|
|
|
|
static struct attribute *mapping_attributes[] = {
|
|
&dev_attr_mapping0.attr,
|
|
&dev_attr_mapping1.attr,
|
|
&dev_attr_mapping2.attr,
|
|
&dev_attr_mapping3.attr,
|
|
&dev_attr_mapping4.attr,
|
|
&dev_attr_mapping5.attr,
|
|
&dev_attr_mapping6.attr,
|
|
&dev_attr_mapping7.attr,
|
|
&dev_attr_mapping8.attr,
|
|
&dev_attr_mapping9.attr,
|
|
&dev_attr_mapping10.attr,
|
|
&dev_attr_mapping11.attr,
|
|
&dev_attr_mapping12.attr,
|
|
&dev_attr_mapping13.attr,
|
|
&dev_attr_mapping14.attr,
|
|
&dev_attr_mapping15.attr,
|
|
&dev_attr_mapping16.attr,
|
|
&dev_attr_mapping17.attr,
|
|
&dev_attr_mapping18.attr,
|
|
&dev_attr_mapping19.attr,
|
|
&dev_attr_mapping20.attr,
|
|
&dev_attr_mapping21.attr,
|
|
&dev_attr_mapping22.attr,
|
|
&dev_attr_mapping23.attr,
|
|
&dev_attr_mapping24.attr,
|
|
&dev_attr_mapping25.attr,
|
|
&dev_attr_mapping26.attr,
|
|
&dev_attr_mapping27.attr,
|
|
&dev_attr_mapping28.attr,
|
|
&dev_attr_mapping29.attr,
|
|
&dev_attr_mapping30.attr,
|
|
&dev_attr_mapping31.attr,
|
|
NULL,
|
|
};
|
|
|
|
struct attribute_group nd_mapping_attribute_group = {
|
|
.is_visible = mapping_visible,
|
|
.attrs = mapping_attributes,
|
|
};
|
|
EXPORT_SYMBOL_GPL(nd_mapping_attribute_group);
|
|
|
|
int nd_blk_region_init(struct nd_region *nd_region)
|
|
{
|
|
struct device *dev = &nd_region->dev;
|
|
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
|
|
|
|
if (!is_nd_blk(dev))
|
|
return 0;
|
|
|
|
if (nd_region->ndr_mappings < 1) {
|
|
dev_err(dev, "invalid BLK region\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
return to_nd_blk_region(dev)->enable(nvdimm_bus, dev);
|
|
}
|
|
|
|
/**
|
|
* nd_region_acquire_lane - allocate and lock a lane
|
|
* @nd_region: region id and number of lanes possible
|
|
*
|
|
* A lane correlates to a BLK-data-window and/or a log slot in the BTT.
|
|
* We optimize for the common case where there are 256 lanes, one
|
|
* per-cpu. For larger systems we need to lock to share lanes. For now
|
|
* this implementation assumes the cost of maintaining an allocator for
|
|
* free lanes is on the order of the lock hold time, so it implements a
|
|
* static lane = cpu % num_lanes mapping.
|
|
*
|
|
* In the case of a BTT instance on top of a BLK namespace a lane may be
|
|
* acquired recursively. We lock on the first instance.
|
|
*
|
|
* In the case of a BTT instance on top of PMEM, we only acquire a lane
|
|
* for the BTT metadata updates.
|
|
*/
|
|
unsigned int nd_region_acquire_lane(struct nd_region *nd_region)
|
|
{
|
|
unsigned int cpu, lane;
|
|
|
|
cpu = get_cpu();
|
|
if (nd_region->num_lanes < nr_cpu_ids) {
|
|
struct nd_percpu_lane *ndl_lock, *ndl_count;
|
|
|
|
lane = cpu % nd_region->num_lanes;
|
|
ndl_count = per_cpu_ptr(nd_region->lane, cpu);
|
|
ndl_lock = per_cpu_ptr(nd_region->lane, lane);
|
|
if (ndl_count->count++ == 0)
|
|
spin_lock(&ndl_lock->lock);
|
|
} else
|
|
lane = cpu;
|
|
|
|
return lane;
|
|
}
|
|
EXPORT_SYMBOL(nd_region_acquire_lane);
|
|
|
|
void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane)
|
|
{
|
|
if (nd_region->num_lanes < nr_cpu_ids) {
|
|
unsigned int cpu = get_cpu();
|
|
struct nd_percpu_lane *ndl_lock, *ndl_count;
|
|
|
|
ndl_count = per_cpu_ptr(nd_region->lane, cpu);
|
|
ndl_lock = per_cpu_ptr(nd_region->lane, lane);
|
|
if (--ndl_count->count == 0)
|
|
spin_unlock(&ndl_lock->lock);
|
|
put_cpu();
|
|
}
|
|
put_cpu();
|
|
}
|
|
EXPORT_SYMBOL(nd_region_release_lane);
|
|
|
|
static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
|
|
struct nd_region_desc *ndr_desc, struct device_type *dev_type,
|
|
const char *caller)
|
|
{
|
|
struct nd_region *nd_region;
|
|
struct device *dev;
|
|
void *region_buf;
|
|
unsigned int i;
|
|
int ro = 0;
|
|
|
|
for (i = 0; i < ndr_desc->num_mappings; i++) {
|
|
struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
|
|
struct nvdimm *nvdimm = mapping->nvdimm;
|
|
|
|
if ((mapping->start | mapping->size) % SZ_4K) {
|
|
dev_err(&nvdimm_bus->dev, "%s: %s mapping%d is not 4K aligned\n",
|
|
caller, dev_name(&nvdimm->dev), i);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
if (nvdimm->flags & NDD_UNARMED)
|
|
ro = 1;
|
|
}
|
|
|
|
if (dev_type == &nd_blk_device_type) {
|
|
struct nd_blk_region_desc *ndbr_desc;
|
|
struct nd_blk_region *ndbr;
|
|
|
|
ndbr_desc = to_blk_region_desc(ndr_desc);
|
|
ndbr = kzalloc(sizeof(*ndbr) + sizeof(struct nd_mapping)
|
|
* ndr_desc->num_mappings,
|
|
GFP_KERNEL);
|
|
if (ndbr) {
|
|
nd_region = &ndbr->nd_region;
|
|
ndbr->enable = ndbr_desc->enable;
|
|
ndbr->do_io = ndbr_desc->do_io;
|
|
}
|
|
region_buf = ndbr;
|
|
} else {
|
|
nd_region = kzalloc(sizeof(struct nd_region)
|
|
+ sizeof(struct nd_mapping)
|
|
* ndr_desc->num_mappings,
|
|
GFP_KERNEL);
|
|
region_buf = nd_region;
|
|
}
|
|
|
|
if (!region_buf)
|
|
return NULL;
|
|
nd_region->id = ida_simple_get(®ion_ida, 0, 0, GFP_KERNEL);
|
|
if (nd_region->id < 0)
|
|
goto err_id;
|
|
|
|
nd_region->lane = alloc_percpu(struct nd_percpu_lane);
|
|
if (!nd_region->lane)
|
|
goto err_percpu;
|
|
|
|
for (i = 0; i < nr_cpu_ids; i++) {
|
|
struct nd_percpu_lane *ndl;
|
|
|
|
ndl = per_cpu_ptr(nd_region->lane, i);
|
|
spin_lock_init(&ndl->lock);
|
|
ndl->count = 0;
|
|
}
|
|
|
|
for (i = 0; i < ndr_desc->num_mappings; i++) {
|
|
struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
|
|
struct nvdimm *nvdimm = mapping->nvdimm;
|
|
|
|
nd_region->mapping[i].nvdimm = nvdimm;
|
|
nd_region->mapping[i].start = mapping->start;
|
|
nd_region->mapping[i].size = mapping->size;
|
|
INIT_LIST_HEAD(&nd_region->mapping[i].labels);
|
|
mutex_init(&nd_region->mapping[i].lock);
|
|
|
|
get_device(&nvdimm->dev);
|
|
}
|
|
nd_region->ndr_mappings = ndr_desc->num_mappings;
|
|
nd_region->provider_data = ndr_desc->provider_data;
|
|
nd_region->nd_set = ndr_desc->nd_set;
|
|
nd_region->num_lanes = ndr_desc->num_lanes;
|
|
nd_region->flags = ndr_desc->flags;
|
|
nd_region->ro = ro;
|
|
nd_region->numa_node = ndr_desc->numa_node;
|
|
ida_init(&nd_region->ns_ida);
|
|
ida_init(&nd_region->btt_ida);
|
|
ida_init(&nd_region->pfn_ida);
|
|
ida_init(&nd_region->dax_ida);
|
|
dev = &nd_region->dev;
|
|
dev_set_name(dev, "region%d", nd_region->id);
|
|
dev->parent = &nvdimm_bus->dev;
|
|
dev->type = dev_type;
|
|
dev->groups = ndr_desc->attr_groups;
|
|
nd_region->ndr_size = resource_size(ndr_desc->res);
|
|
nd_region->ndr_start = ndr_desc->res->start;
|
|
nd_device_register(dev);
|
|
|
|
return nd_region;
|
|
|
|
err_percpu:
|
|
ida_simple_remove(®ion_ida, nd_region->id);
|
|
err_id:
|
|
kfree(region_buf);
|
|
return NULL;
|
|
}
|
|
|
|
struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
|
|
struct nd_region_desc *ndr_desc)
|
|
{
|
|
ndr_desc->num_lanes = ND_MAX_LANES;
|
|
return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type,
|
|
__func__);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create);
|
|
|
|
struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
|
|
struct nd_region_desc *ndr_desc)
|
|
{
|
|
if (ndr_desc->num_mappings > 1)
|
|
return NULL;
|
|
ndr_desc->num_lanes = min(ndr_desc->num_lanes, ND_MAX_LANES);
|
|
return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type,
|
|
__func__);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvdimm_blk_region_create);
|
|
|
|
struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
|
|
struct nd_region_desc *ndr_desc)
|
|
{
|
|
ndr_desc->num_lanes = ND_MAX_LANES;
|
|
return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type,
|
|
__func__);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create);
|
|
|
|
/**
|
|
* nvdimm_flush - flush any posted write queues between the cpu and pmem media
|
|
* @nd_region: blk or interleaved pmem region
|
|
*/
|
|
void nvdimm_flush(struct nd_region *nd_region)
|
|
{
|
|
struct nd_region_data *ndrd = dev_get_drvdata(&nd_region->dev);
|
|
int i, idx;
|
|
|
|
/*
|
|
* Try to encourage some diversity in flush hint addresses
|
|
* across cpus assuming a limited number of flush hints.
|
|
*/
|
|
idx = this_cpu_read(flush_idx);
|
|
idx = this_cpu_add_return(flush_idx, hash_32(current->pid + idx, 8));
|
|
|
|
/*
|
|
* The first wmb() is needed to 'sfence' all previous writes
|
|
* such that they are architecturally visible for the platform
|
|
* buffer flush. Note that we've already arranged for pmem
|
|
* writes to avoid the cache via arch_memcpy_to_pmem(). The
|
|
* final wmb() ensures ordering for the NVDIMM flush write.
|
|
*/
|
|
wmb();
|
|
for (i = 0; i < nd_region->ndr_mappings; i++)
|
|
if (ndrd_get_flush_wpq(ndrd, i, 0))
|
|
writeq(1, ndrd_get_flush_wpq(ndrd, i, idx));
|
|
wmb();
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvdimm_flush);
|
|
|
|
/**
|
|
* nvdimm_has_flush - determine write flushing requirements
|
|
* @nd_region: blk or interleaved pmem region
|
|
*
|
|
* Returns 1 if writes require flushing
|
|
* Returns 0 if writes do not require flushing
|
|
* Returns -ENXIO if flushing capability can not be determined
|
|
*/
|
|
int nvdimm_has_flush(struct nd_region *nd_region)
|
|
{
|
|
struct nd_region_data *ndrd = dev_get_drvdata(&nd_region->dev);
|
|
int i;
|
|
|
|
/* no nvdimm == flushing capability unknown */
|
|
if (nd_region->ndr_mappings == 0)
|
|
return -ENXIO;
|
|
|
|
for (i = 0; i < nd_region->ndr_mappings; i++)
|
|
/* flush hints present, flushing required */
|
|
if (ndrd_get_flush_wpq(ndrd, i, 0))
|
|
return 1;
|
|
|
|
/*
|
|
* The platform defines dimm devices without hints, assume
|
|
* platform persistence mechanism like ADR
|
|
*/
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvdimm_has_flush);
|
|
|
|
void __exit nd_region_devs_exit(void)
|
|
{
|
|
ida_destroy(®ion_ida);
|
|
}
|