291 lines
6.6 KiB
C
291 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Recognize and maintain s390 storage class memory.
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*
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* Copyright IBM Corp. 2012
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* Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <asm/eadm.h>
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#include "chsc.h"
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static struct device *scm_root;
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#define to_scm_dev(n) container_of(n, struct scm_device, dev)
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#define to_scm_drv(d) container_of(d, struct scm_driver, drv)
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static int scmdev_probe(struct device *dev)
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{
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struct scm_device *scmdev = to_scm_dev(dev);
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struct scm_driver *scmdrv = to_scm_drv(dev->driver);
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return scmdrv->probe ? scmdrv->probe(scmdev) : -ENODEV;
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}
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static void scmdev_remove(struct device *dev)
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{
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struct scm_device *scmdev = to_scm_dev(dev);
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struct scm_driver *scmdrv = to_scm_drv(dev->driver);
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if (scmdrv->remove)
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scmdrv->remove(scmdev);
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}
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static int scmdev_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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return add_uevent_var(env, "MODALIAS=scm:scmdev");
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}
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static struct bus_type scm_bus_type = {
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.name = "scm",
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.probe = scmdev_probe,
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.remove = scmdev_remove,
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.uevent = scmdev_uevent,
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};
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/**
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* scm_driver_register() - register a scm driver
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* @scmdrv: driver to be registered
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*/
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int scm_driver_register(struct scm_driver *scmdrv)
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{
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struct device_driver *drv = &scmdrv->drv;
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drv->bus = &scm_bus_type;
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return driver_register(drv);
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}
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EXPORT_SYMBOL_GPL(scm_driver_register);
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/**
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* scm_driver_unregister() - deregister a scm driver
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* @scmdrv: driver to be deregistered
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*/
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void scm_driver_unregister(struct scm_driver *scmdrv)
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{
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driver_unregister(&scmdrv->drv);
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}
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EXPORT_SYMBOL_GPL(scm_driver_unregister);
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void scm_irq_handler(struct aob *aob, blk_status_t error)
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{
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struct aob_rq_header *aobrq = (void *) aob->request.data;
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struct scm_device *scmdev = aobrq->scmdev;
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struct scm_driver *scmdrv = to_scm_drv(scmdev->dev.driver);
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scmdrv->handler(scmdev, aobrq->data, error);
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}
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EXPORT_SYMBOL_GPL(scm_irq_handler);
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#define scm_attr(name) \
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static ssize_t show_##name(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct scm_device *scmdev = to_scm_dev(dev); \
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int ret; \
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\
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device_lock(dev); \
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ret = sprintf(buf, "%u\n", scmdev->attrs.name); \
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device_unlock(dev); \
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\
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return ret; \
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} \
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static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
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scm_attr(persistence);
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scm_attr(oper_state);
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scm_attr(data_state);
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scm_attr(rank);
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scm_attr(release);
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scm_attr(res_id);
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static struct attribute *scmdev_attrs[] = {
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&dev_attr_persistence.attr,
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&dev_attr_oper_state.attr,
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&dev_attr_data_state.attr,
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&dev_attr_rank.attr,
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&dev_attr_release.attr,
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&dev_attr_res_id.attr,
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NULL,
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};
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static struct attribute_group scmdev_attr_group = {
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.attrs = scmdev_attrs,
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};
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static const struct attribute_group *scmdev_attr_groups[] = {
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&scmdev_attr_group,
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NULL,
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};
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static void scmdev_release(struct device *dev)
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{
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struct scm_device *scmdev = to_scm_dev(dev);
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kfree(scmdev);
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}
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static void scmdev_setup(struct scm_device *scmdev, struct sale *sale,
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unsigned int size, unsigned int max_blk_count)
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{
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dev_set_name(&scmdev->dev, "%016llx", (unsigned long long) sale->sa);
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scmdev->nr_max_block = max_blk_count;
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scmdev->address = sale->sa;
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scmdev->size = 1UL << size;
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scmdev->attrs.rank = sale->rank;
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scmdev->attrs.persistence = sale->p;
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scmdev->attrs.oper_state = sale->op_state;
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scmdev->attrs.data_state = sale->data_state;
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scmdev->attrs.rank = sale->rank;
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scmdev->attrs.release = sale->r;
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scmdev->attrs.res_id = sale->rid;
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scmdev->dev.parent = scm_root;
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scmdev->dev.bus = &scm_bus_type;
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scmdev->dev.release = scmdev_release;
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scmdev->dev.groups = scmdev_attr_groups;
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}
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/*
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* Check for state-changes, notify the driver and userspace.
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*/
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static void scmdev_update(struct scm_device *scmdev, struct sale *sale)
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{
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struct scm_driver *scmdrv;
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bool changed;
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device_lock(&scmdev->dev);
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changed = scmdev->attrs.rank != sale->rank ||
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scmdev->attrs.oper_state != sale->op_state;
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scmdev->attrs.rank = sale->rank;
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scmdev->attrs.oper_state = sale->op_state;
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if (!scmdev->dev.driver)
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goto out;
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scmdrv = to_scm_drv(scmdev->dev.driver);
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if (changed && scmdrv->notify)
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scmdrv->notify(scmdev, SCM_CHANGE);
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out:
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device_unlock(&scmdev->dev);
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if (changed)
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kobject_uevent(&scmdev->dev.kobj, KOBJ_CHANGE);
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}
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static int check_address(struct device *dev, const void *data)
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{
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struct scm_device *scmdev = to_scm_dev(dev);
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const struct sale *sale = data;
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return scmdev->address == sale->sa;
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}
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static struct scm_device *scmdev_find(struct sale *sale)
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{
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struct device *dev;
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dev = bus_find_device(&scm_bus_type, NULL, sale, check_address);
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return dev ? to_scm_dev(dev) : NULL;
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}
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static int scm_add(struct chsc_scm_info *scm_info, size_t num)
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{
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struct sale *sale, *scmal = scm_info->scmal;
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struct scm_device *scmdev;
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int ret;
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for (sale = scmal; sale < scmal + num; sale++) {
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scmdev = scmdev_find(sale);
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if (scmdev) {
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scmdev_update(scmdev, sale);
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/* Release reference from scm_find(). */
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put_device(&scmdev->dev);
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continue;
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}
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scmdev = kzalloc(sizeof(*scmdev), GFP_KERNEL);
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if (!scmdev)
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return -ENODEV;
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scmdev_setup(scmdev, sale, scm_info->is, scm_info->mbc);
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ret = device_register(&scmdev->dev);
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if (ret) {
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/* Release reference from device_initialize(). */
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put_device(&scmdev->dev);
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return ret;
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}
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}
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return 0;
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}
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int scm_update_information(void)
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{
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struct chsc_scm_info *scm_info;
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u64 token = 0;
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size_t num;
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int ret;
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scm_info = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
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if (!scm_info)
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return -ENOMEM;
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do {
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ret = chsc_scm_info(scm_info, token);
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if (ret)
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break;
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num = (scm_info->response.length -
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(offsetof(struct chsc_scm_info, scmal) -
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offsetof(struct chsc_scm_info, response))
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) / sizeof(struct sale);
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ret = scm_add(scm_info, num);
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if (ret)
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break;
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token = scm_info->restok;
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} while (token);
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free_page((unsigned long)scm_info);
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return ret;
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}
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static int scm_dev_avail(struct device *dev, void *unused)
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{
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struct scm_driver *scmdrv = to_scm_drv(dev->driver);
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struct scm_device *scmdev = to_scm_dev(dev);
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if (dev->driver && scmdrv->notify)
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scmdrv->notify(scmdev, SCM_AVAIL);
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return 0;
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}
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int scm_process_availability_information(void)
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{
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return bus_for_each_dev(&scm_bus_type, NULL, NULL, scm_dev_avail);
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}
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static int __init scm_init(void)
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{
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int ret;
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ret = bus_register(&scm_bus_type);
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if (ret)
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return ret;
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scm_root = root_device_register("scm");
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if (IS_ERR(scm_root)) {
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bus_unregister(&scm_bus_type);
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return PTR_ERR(scm_root);
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}
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scm_update_information();
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return 0;
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}
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subsys_initcall_sync(scm_init);
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