mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 08:58:07 +00:00
8c26ab7266
With kernel now supporting new pmem flush/sync instructions, we can now enable the kernel to initialize the device. On P10 these devices would appear with a new compatible string. For PAPR device we have compatible "ibm,pmemory-v2" and for OF pmem device we have compatible "pmem-region-v2" Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200701072235.223558-8-aneesh.kumar@linux.ibm.com
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
|
|
#define pr_fmt(fmt) "of_pmem: " fmt
|
|
|
|
#include <linux/of_platform.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/libnvdimm.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/slab.h>
|
|
|
|
struct of_pmem_private {
|
|
struct nvdimm_bus_descriptor bus_desc;
|
|
struct nvdimm_bus *bus;
|
|
};
|
|
|
|
static int of_pmem_region_probe(struct platform_device *pdev)
|
|
{
|
|
struct of_pmem_private *priv;
|
|
struct device_node *np;
|
|
struct nvdimm_bus *bus;
|
|
bool is_volatile;
|
|
int i;
|
|
|
|
np = dev_of_node(&pdev->dev);
|
|
if (!np)
|
|
return -ENXIO;
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->bus_desc.provider_name = kstrdup(pdev->name, GFP_KERNEL);
|
|
priv->bus_desc.module = THIS_MODULE;
|
|
priv->bus_desc.of_node = np;
|
|
|
|
priv->bus = bus = nvdimm_bus_register(&pdev->dev, &priv->bus_desc);
|
|
if (!bus) {
|
|
kfree(priv);
|
|
return -ENODEV;
|
|
}
|
|
platform_set_drvdata(pdev, priv);
|
|
|
|
is_volatile = !!of_find_property(np, "volatile", NULL);
|
|
dev_dbg(&pdev->dev, "Registering %s regions from %pOF\n",
|
|
is_volatile ? "volatile" : "non-volatile", np);
|
|
|
|
for (i = 0; i < pdev->num_resources; i++) {
|
|
struct nd_region_desc ndr_desc;
|
|
struct nd_region *region;
|
|
|
|
/*
|
|
* NB: libnvdimm copies the data from ndr_desc into it's own
|
|
* structures so passing a stack pointer is fine.
|
|
*/
|
|
memset(&ndr_desc, 0, sizeof(ndr_desc));
|
|
ndr_desc.numa_node = dev_to_node(&pdev->dev);
|
|
ndr_desc.target_node = ndr_desc.numa_node;
|
|
ndr_desc.res = &pdev->resource[i];
|
|
ndr_desc.of_node = np;
|
|
set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
|
|
|
|
if (is_volatile)
|
|
region = nvdimm_volatile_region_create(bus, &ndr_desc);
|
|
else {
|
|
set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags);
|
|
region = nvdimm_pmem_region_create(bus, &ndr_desc);
|
|
}
|
|
|
|
if (!region)
|
|
dev_warn(&pdev->dev, "Unable to register region %pR from %pOF\n",
|
|
ndr_desc.res, np);
|
|
else
|
|
dev_dbg(&pdev->dev, "Registered region %pR from %pOF\n",
|
|
ndr_desc.res, np);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int of_pmem_region_remove(struct platform_device *pdev)
|
|
{
|
|
struct of_pmem_private *priv = platform_get_drvdata(pdev);
|
|
|
|
nvdimm_bus_unregister(priv->bus);
|
|
kfree(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id of_pmem_region_match[] = {
|
|
{ .compatible = "pmem-region" },
|
|
{ .compatible = "pmem-region-v2" },
|
|
{ },
|
|
};
|
|
|
|
static struct platform_driver of_pmem_region_driver = {
|
|
.probe = of_pmem_region_probe,
|
|
.remove = of_pmem_region_remove,
|
|
.driver = {
|
|
.name = "of_pmem",
|
|
.of_match_table = of_pmem_region_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(of_pmem_region_driver);
|
|
MODULE_DEVICE_TABLE(of, of_pmem_region_match);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("IBM Corporation");
|