mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Ben Widawsky](/assets/img/avatar_default.png)
CXL core is growing, and it's already arguably unmanageable. To support future growth, move core functionality to a new directory and rename the file to represent just bus support. Future work will remove non-bus functionality. Note that mem.h is renamed to cxlmem.h to avoid a namespace collision with the global ARCH=um mem.h header. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Ben Widawsky <ben.widawsky@intel.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://lore.kernel.org/r/162792537866.368511.8915631504621088321.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
230 lines
5.2 KiB
C
230 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* Copyright(c) 2021 Intel Corporation. All rights reserved. */
|
|
#include <linux/libnvdimm.h>
|
|
#include <linux/device.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ndctl.h>
|
|
#include <linux/async.h>
|
|
#include <linux/slab.h>
|
|
#include "cxlmem.h"
|
|
#include "cxl.h"
|
|
|
|
/*
|
|
* Ordered workqueue for cxl nvdimm device arrival and departure
|
|
* to coordinate bus rescans when a bridge arrives and trigger remove
|
|
* operations when the bridge is removed.
|
|
*/
|
|
static struct workqueue_struct *cxl_pmem_wq;
|
|
|
|
static void unregister_nvdimm(void *nvdimm)
|
|
{
|
|
nvdimm_delete(nvdimm);
|
|
}
|
|
|
|
static int match_nvdimm_bridge(struct device *dev, const void *data)
|
|
{
|
|
return strcmp(dev_name(dev), "nvdimm-bridge") == 0;
|
|
}
|
|
|
|
static struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(void)
|
|
{
|
|
struct device *dev;
|
|
|
|
dev = bus_find_device(&cxl_bus_type, NULL, NULL, match_nvdimm_bridge);
|
|
if (!dev)
|
|
return NULL;
|
|
return to_cxl_nvdimm_bridge(dev);
|
|
}
|
|
|
|
static int cxl_nvdimm_probe(struct device *dev)
|
|
{
|
|
struct cxl_nvdimm *cxl_nvd = to_cxl_nvdimm(dev);
|
|
struct cxl_nvdimm_bridge *cxl_nvb;
|
|
unsigned long flags = 0;
|
|
struct nvdimm *nvdimm;
|
|
int rc = -ENXIO;
|
|
|
|
cxl_nvb = cxl_find_nvdimm_bridge();
|
|
if (!cxl_nvb)
|
|
return -ENXIO;
|
|
|
|
device_lock(&cxl_nvb->dev);
|
|
if (!cxl_nvb->nvdimm_bus)
|
|
goto out;
|
|
|
|
set_bit(NDD_LABELING, &flags);
|
|
nvdimm = nvdimm_create(cxl_nvb->nvdimm_bus, cxl_nvd, NULL, flags, 0, 0,
|
|
NULL);
|
|
if (!nvdimm)
|
|
goto out;
|
|
|
|
rc = devm_add_action_or_reset(dev, unregister_nvdimm, nvdimm);
|
|
out:
|
|
device_unlock(&cxl_nvb->dev);
|
|
put_device(&cxl_nvb->dev);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static struct cxl_driver cxl_nvdimm_driver = {
|
|
.name = "cxl_nvdimm",
|
|
.probe = cxl_nvdimm_probe,
|
|
.id = CXL_DEVICE_NVDIMM,
|
|
};
|
|
|
|
static int cxl_pmem_ctl(struct nvdimm_bus_descriptor *nd_desc,
|
|
struct nvdimm *nvdimm, unsigned int cmd, void *buf,
|
|
unsigned int buf_len, int *cmd_rc)
|
|
{
|
|
return -ENOTTY;
|
|
}
|
|
|
|
static bool online_nvdimm_bus(struct cxl_nvdimm_bridge *cxl_nvb)
|
|
{
|
|
if (cxl_nvb->nvdimm_bus)
|
|
return true;
|
|
cxl_nvb->nvdimm_bus =
|
|
nvdimm_bus_register(&cxl_nvb->dev, &cxl_nvb->nd_desc);
|
|
return cxl_nvb->nvdimm_bus != NULL;
|
|
}
|
|
|
|
static int cxl_nvdimm_release_driver(struct device *dev, void *data)
|
|
{
|
|
if (!is_cxl_nvdimm(dev))
|
|
return 0;
|
|
device_release_driver(dev);
|
|
return 0;
|
|
}
|
|
|
|
static void offline_nvdimm_bus(struct nvdimm_bus *nvdimm_bus)
|
|
{
|
|
if (!nvdimm_bus)
|
|
return;
|
|
|
|
/*
|
|
* Set the state of cxl_nvdimm devices to unbound / idle before
|
|
* nvdimm_bus_unregister() rips the nvdimm objects out from
|
|
* underneath them.
|
|
*/
|
|
bus_for_each_dev(&cxl_bus_type, NULL, NULL, cxl_nvdimm_release_driver);
|
|
nvdimm_bus_unregister(nvdimm_bus);
|
|
}
|
|
|
|
static void cxl_nvb_update_state(struct work_struct *work)
|
|
{
|
|
struct cxl_nvdimm_bridge *cxl_nvb =
|
|
container_of(work, typeof(*cxl_nvb), state_work);
|
|
struct nvdimm_bus *victim_bus = NULL;
|
|
bool release = false, rescan = false;
|
|
|
|
device_lock(&cxl_nvb->dev);
|
|
switch (cxl_nvb->state) {
|
|
case CXL_NVB_ONLINE:
|
|
if (!online_nvdimm_bus(cxl_nvb)) {
|
|
dev_err(&cxl_nvb->dev,
|
|
"failed to establish nvdimm bus\n");
|
|
release = true;
|
|
} else
|
|
rescan = true;
|
|
break;
|
|
case CXL_NVB_OFFLINE:
|
|
case CXL_NVB_DEAD:
|
|
victim_bus = cxl_nvb->nvdimm_bus;
|
|
cxl_nvb->nvdimm_bus = NULL;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
device_unlock(&cxl_nvb->dev);
|
|
|
|
if (release)
|
|
device_release_driver(&cxl_nvb->dev);
|
|
if (rescan) {
|
|
int rc = bus_rescan_devices(&cxl_bus_type);
|
|
|
|
dev_dbg(&cxl_nvb->dev, "rescan: %d\n", rc);
|
|
}
|
|
offline_nvdimm_bus(victim_bus);
|
|
|
|
put_device(&cxl_nvb->dev);
|
|
}
|
|
|
|
static void cxl_nvdimm_bridge_remove(struct device *dev)
|
|
{
|
|
struct cxl_nvdimm_bridge *cxl_nvb = to_cxl_nvdimm_bridge(dev);
|
|
|
|
if (cxl_nvb->state == CXL_NVB_ONLINE)
|
|
cxl_nvb->state = CXL_NVB_OFFLINE;
|
|
if (queue_work(cxl_pmem_wq, &cxl_nvb->state_work))
|
|
get_device(&cxl_nvb->dev);
|
|
}
|
|
|
|
static int cxl_nvdimm_bridge_probe(struct device *dev)
|
|
{
|
|
struct cxl_nvdimm_bridge *cxl_nvb = to_cxl_nvdimm_bridge(dev);
|
|
|
|
if (cxl_nvb->state == CXL_NVB_DEAD)
|
|
return -ENXIO;
|
|
|
|
if (cxl_nvb->state == CXL_NVB_NEW) {
|
|
cxl_nvb->nd_desc = (struct nvdimm_bus_descriptor) {
|
|
.provider_name = "CXL",
|
|
.module = THIS_MODULE,
|
|
.ndctl = cxl_pmem_ctl,
|
|
};
|
|
|
|
INIT_WORK(&cxl_nvb->state_work, cxl_nvb_update_state);
|
|
}
|
|
|
|
cxl_nvb->state = CXL_NVB_ONLINE;
|
|
if (queue_work(cxl_pmem_wq, &cxl_nvb->state_work))
|
|
get_device(&cxl_nvb->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct cxl_driver cxl_nvdimm_bridge_driver = {
|
|
.name = "cxl_nvdimm_bridge",
|
|
.probe = cxl_nvdimm_bridge_probe,
|
|
.remove = cxl_nvdimm_bridge_remove,
|
|
.id = CXL_DEVICE_NVDIMM_BRIDGE,
|
|
};
|
|
|
|
static __init int cxl_pmem_init(void)
|
|
{
|
|
int rc;
|
|
|
|
cxl_pmem_wq = alloc_ordered_workqueue("cxl_pmem", 0);
|
|
if (!cxl_pmem_wq)
|
|
return -ENXIO;
|
|
|
|
rc = cxl_driver_register(&cxl_nvdimm_bridge_driver);
|
|
if (rc)
|
|
goto err_bridge;
|
|
|
|
rc = cxl_driver_register(&cxl_nvdimm_driver);
|
|
if (rc)
|
|
goto err_nvdimm;
|
|
|
|
return 0;
|
|
|
|
err_nvdimm:
|
|
cxl_driver_unregister(&cxl_nvdimm_bridge_driver);
|
|
err_bridge:
|
|
destroy_workqueue(cxl_pmem_wq);
|
|
return rc;
|
|
}
|
|
|
|
static __exit void cxl_pmem_exit(void)
|
|
{
|
|
cxl_driver_unregister(&cxl_nvdimm_driver);
|
|
cxl_driver_unregister(&cxl_nvdimm_bridge_driver);
|
|
destroy_workqueue(cxl_pmem_wq);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
module_init(cxl_pmem_init);
|
|
module_exit(cxl_pmem_exit);
|
|
MODULE_IMPORT_NS(CXL);
|
|
MODULE_ALIAS_CXL(CXL_DEVICE_NVDIMM_BRIDGE);
|
|
MODULE_ALIAS_CXL(CXL_DEVICE_NVDIMM);
|