2016-05-18 19:15:08 +03:00
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/*
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* Copyright(c) 2016 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/percpu-refcount.h>
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#include <linux/memremap.h>
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#include <linux/module.h>
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#include <linux/pfn_t.h>
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#include "../nvdimm/pfn.h"
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#include "../nvdimm/nd.h"
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#include "dax.h"
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struct dax_pmem {
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struct device *dev;
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struct percpu_ref ref;
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struct completion cmp;
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};
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2016-08-07 02:05:06 +03:00
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static struct dax_pmem *to_dax_pmem(struct percpu_ref *ref)
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2016-05-18 19:15:08 +03:00
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{
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return container_of(ref, struct dax_pmem, ref);
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}
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static void dax_pmem_percpu_release(struct percpu_ref *ref)
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{
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struct dax_pmem *dax_pmem = to_dax_pmem(ref);
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dev_dbg(dax_pmem->dev, "%s\n", __func__);
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complete(&dax_pmem->cmp);
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}
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static void dax_pmem_percpu_exit(void *data)
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{
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struct percpu_ref *ref = data;
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struct dax_pmem *dax_pmem = to_dax_pmem(ref);
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dev_dbg(dax_pmem->dev, "%s\n", __func__);
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percpu_ref_exit(ref);
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}
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static void dax_pmem_percpu_kill(void *data)
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{
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struct percpu_ref *ref = data;
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struct dax_pmem *dax_pmem = to_dax_pmem(ref);
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dev_dbg(dax_pmem->dev, "%s\n", __func__);
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percpu_ref_kill(ref);
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2016-10-28 03:04:05 +03:00
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wait_for_completion(&dax_pmem->cmp);
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2016-05-18 19:15:08 +03:00
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}
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static int dax_pmem_probe(struct device *dev)
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{
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int rc;
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void *addr;
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struct resource res;
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2016-07-20 03:51:40 +03:00
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struct dax_dev *dax_dev;
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2016-05-18 19:15:08 +03:00
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struct nd_pfn_sb *pfn_sb;
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struct dax_pmem *dax_pmem;
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struct nd_region *nd_region;
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struct nd_namespace_io *nsio;
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struct dax_region *dax_region;
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struct nd_namespace_common *ndns;
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struct nd_dax *nd_dax = to_nd_dax(dev);
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struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
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struct vmem_altmap __altmap, *altmap = NULL;
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ndns = nvdimm_namespace_common_probe(dev);
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if (IS_ERR(ndns))
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return PTR_ERR(ndns);
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nsio = to_nd_namespace_io(&ndns->dev);
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/* parse the 'pfn' info block via ->rw_bytes */
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2016-10-29 00:34:51 +03:00
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rc = devm_nsio_enable(dev, nsio);
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if (rc)
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return rc;
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2016-05-18 19:15:08 +03:00
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altmap = nvdimm_setup_pfn(nd_pfn, &res, &__altmap);
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if (IS_ERR(altmap))
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return PTR_ERR(altmap);
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devm_nsio_disable(dev, nsio);
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pfn_sb = nd_pfn->pfn_sb;
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if (!devm_request_mem_region(dev, nsio->res.start,
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libnvdimm: use consistent naming for request_mem_region()
Here is an example /proc/iomem listing for a system with 2 namespaces,
one in "sector" mode and one in "memory" mode:
1fc000000-2fbffffff : Persistent Memory (legacy)
1fc000000-2fbffffff : namespace1.0
340000000-34fffffff : Persistent Memory
340000000-34fffffff : btt0.1
Here is the corresponding ndctl listing:
# ndctl list
[
{
"dev":"namespace1.0",
"mode":"memory",
"size":4294967296,
"blockdev":"pmem1"
},
{
"dev":"namespace0.0",
"mode":"sector",
"size":267091968,
"uuid":"f7594f86-badb-4592-875f-ded577da2eaf",
"sector_size":4096,
"blockdev":"pmem0s"
}
]
Notice that the ndctl listing is purely in terms of namespace devices,
while the iomem listing leaks the internal "btt0.1" implementation
detail. Given that ndctl requires the namespace device name to change
the mode, for example:
# ndctl create-namespace --reconfig=namespace0.0 --mode=raw --force
...use the namespace name in the iomem listing to keep the claiming
device name consistent across different mode settings.
Cc: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2016-11-28 22:15:18 +03:00
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resource_size(&nsio->res),
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dev_name(&ndns->dev))) {
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2016-05-18 19:15:08 +03:00
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dev_warn(dev, "could not reserve region %pR\n", &nsio->res);
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return -EBUSY;
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}
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dax_pmem = devm_kzalloc(dev, sizeof(*dax_pmem), GFP_KERNEL);
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if (!dax_pmem)
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return -ENOMEM;
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dax_pmem->dev = dev;
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init_completion(&dax_pmem->cmp);
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rc = percpu_ref_init(&dax_pmem->ref, dax_pmem_percpu_release, 0,
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GFP_KERNEL);
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if (rc)
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return rc;
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2016-07-05 08:50:07 +03:00
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rc = devm_add_action_or_reset(dev, dax_pmem_percpu_exit,
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&dax_pmem->ref);
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if (rc)
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2016-05-18 19:15:08 +03:00
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return rc;
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addr = devm_memremap_pages(dev, &res, &dax_pmem->ref, altmap);
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if (IS_ERR(addr))
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return PTR_ERR(addr);
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2016-07-05 08:50:07 +03:00
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rc = devm_add_action_or_reset(dev, dax_pmem_percpu_kill,
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&dax_pmem->ref);
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if (rc)
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2016-05-18 19:15:08 +03:00
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return rc;
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2016-08-26 01:17:14 +03:00
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/* adjust the dax_region resource to the start of data */
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res.start += le64_to_cpu(pfn_sb->dataoff);
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2016-05-18 19:15:08 +03:00
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nd_region = to_nd_region(dev->parent);
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dax_region = alloc_dax_region(dev, nd_region->id, &res,
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le32_to_cpu(pfn_sb->align), addr, PFN_DEV|PFN_MAP);
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if (!dax_region)
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return -ENOMEM;
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/* TODO: support for subdividing a dax region... */
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2016-07-20 03:51:40 +03:00
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dax_dev = devm_create_dax_dev(dax_region, &res, 1);
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2016-05-18 19:15:08 +03:00
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/* child dax_dev instances now own the lifetime of the dax_region */
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dax_region_put(dax_region);
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2016-07-20 03:51:40 +03:00
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return PTR_ERR_OR_ZERO(dax_dev);
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2016-05-18 19:15:08 +03:00
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}
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static struct nd_device_driver dax_pmem_driver = {
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.probe = dax_pmem_probe,
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.drv = {
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.name = "dax_pmem",
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},
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.type = ND_DRIVER_DAX_PMEM,
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};
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static int __init dax_pmem_init(void)
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{
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return nd_driver_register(&dax_pmem_driver);
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}
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module_init(dax_pmem_init);
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static void __exit dax_pmem_exit(void)
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{
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driver_unregister(&dax_pmem_driver.drv);
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}
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module_exit(dax_pmem_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Intel Corporation");
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MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);
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