^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Recognize and maintain s390 storage class memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright IBM Corp. 2012
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/eadm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "chsc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static struct device *scm_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define to_scm_dev(n) container_of(n, struct scm_device, dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define to_scm_drv(d) container_of(d, struct scm_driver, drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int scmdev_probe(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct scm_device *scmdev = to_scm_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct scm_driver *scmdrv = to_scm_drv(dev->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) return scmdrv->probe ? scmdrv->probe(scmdev) : -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static int scmdev_remove(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct scm_device *scmdev = to_scm_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct scm_driver *scmdrv = to_scm_drv(dev->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return scmdrv->remove ? scmdrv->remove(scmdev) : -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int scmdev_uevent(struct device *dev, struct kobj_uevent_env *env)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return add_uevent_var(env, "MODALIAS=scm:scmdev");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static struct bus_type scm_bus_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) .name = "scm",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) .probe = scmdev_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) .remove = scmdev_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) .uevent = scmdev_uevent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * scm_driver_register() - register a scm driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * @scmdrv: driver to be registered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) int scm_driver_register(struct scm_driver *scmdrv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct device_driver *drv = &scmdrv->drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) drv->bus = &scm_bus_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return driver_register(drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) EXPORT_SYMBOL_GPL(scm_driver_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * scm_driver_unregister() - deregister a scm driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * @scmdrv: driver to be deregistered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) void scm_driver_unregister(struct scm_driver *scmdrv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) driver_unregister(&scmdrv->drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) EXPORT_SYMBOL_GPL(scm_driver_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) void scm_irq_handler(struct aob *aob, blk_status_t error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct aob_rq_header *aobrq = (void *) aob->request.data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct scm_device *scmdev = aobrq->scmdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct scm_driver *scmdrv = to_scm_drv(scmdev->dev.driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) scmdrv->handler(scmdev, aobrq->data, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) EXPORT_SYMBOL_GPL(scm_irq_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) #define scm_attr(name) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) static ssize_t show_##name(struct device *dev, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct device_attribute *attr, char *buf) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct scm_device *scmdev = to_scm_dev(dev); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) int ret; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) device_lock(dev); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) ret = sprintf(buf, "%u\n", scmdev->attrs.name); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) device_unlock(dev); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return ret; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) scm_attr(persistence);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) scm_attr(oper_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) scm_attr(data_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) scm_attr(rank);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) scm_attr(release);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) scm_attr(res_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static struct attribute *scmdev_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) &dev_attr_persistence.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) &dev_attr_oper_state.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) &dev_attr_data_state.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) &dev_attr_rank.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) &dev_attr_release.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) &dev_attr_res_id.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static struct attribute_group scmdev_attr_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) .attrs = scmdev_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static const struct attribute_group *scmdev_attr_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) &scmdev_attr_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static void scmdev_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct scm_device *scmdev = to_scm_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) kfree(scmdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static void scmdev_setup(struct scm_device *scmdev, struct sale *sale,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) unsigned int size, unsigned int max_blk_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) dev_set_name(&scmdev->dev, "%016llx", (unsigned long long) sale->sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) scmdev->nr_max_block = max_blk_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) scmdev->address = sale->sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) scmdev->size = 1UL << size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) scmdev->attrs.rank = sale->rank;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) scmdev->attrs.persistence = sale->p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) scmdev->attrs.oper_state = sale->op_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) scmdev->attrs.data_state = sale->data_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) scmdev->attrs.rank = sale->rank;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) scmdev->attrs.release = sale->r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) scmdev->attrs.res_id = sale->rid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) scmdev->dev.parent = scm_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) scmdev->dev.bus = &scm_bus_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) scmdev->dev.release = scmdev_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) scmdev->dev.groups = scmdev_attr_groups;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * Check for state-changes, notify the driver and userspace.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) static void scmdev_update(struct scm_device *scmdev, struct sale *sale)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) struct scm_driver *scmdrv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) bool changed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) device_lock(&scmdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) changed = scmdev->attrs.rank != sale->rank ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) scmdev->attrs.oper_state != sale->op_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) scmdev->attrs.rank = sale->rank;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) scmdev->attrs.oper_state = sale->op_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (!scmdev->dev.driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) scmdrv = to_scm_drv(scmdev->dev.driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (changed && scmdrv->notify)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) scmdrv->notify(scmdev, SCM_CHANGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) device_unlock(&scmdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) if (changed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) kobject_uevent(&scmdev->dev.kobj, KOBJ_CHANGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static int check_address(struct device *dev, const void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct scm_device *scmdev = to_scm_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) const struct sale *sale = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return scmdev->address == sale->sa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) static struct scm_device *scmdev_find(struct sale *sale)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) dev = bus_find_device(&scm_bus_type, NULL, sale, check_address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return dev ? to_scm_dev(dev) : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static int scm_add(struct chsc_scm_info *scm_info, size_t num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct sale *sale, *scmal = scm_info->scmal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) struct scm_device *scmdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) for (sale = scmal; sale < scmal + num; sale++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) scmdev = scmdev_find(sale);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (scmdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) scmdev_update(scmdev, sale);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) /* Release reference from scm_find(). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) put_device(&scmdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) scmdev = kzalloc(sizeof(*scmdev), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) if (!scmdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) scmdev_setup(scmdev, sale, scm_info->is, scm_info->mbc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) ret = device_register(&scmdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) /* Release reference from device_initialize(). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) put_device(&scmdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) int scm_update_information(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) struct chsc_scm_info *scm_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) u64 token = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) size_t num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) scm_info = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (!scm_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) ret = chsc_scm_info(scm_info, token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) num = (scm_info->response.length -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) (offsetof(struct chsc_scm_info, scmal) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) offsetof(struct chsc_scm_info, response))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) ) / sizeof(struct sale);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) ret = scm_add(scm_info, num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) token = scm_info->restok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) } while (token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) free_page((unsigned long)scm_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) static int scm_dev_avail(struct device *dev, void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) struct scm_driver *scmdrv = to_scm_drv(dev->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) struct scm_device *scmdev = to_scm_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (dev->driver && scmdrv->notify)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) scmdrv->notify(scmdev, SCM_AVAIL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) int scm_process_availability_information(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) return bus_for_each_dev(&scm_bus_type, NULL, NULL, scm_dev_avail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) static int __init scm_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) ret = bus_register(&scm_bus_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) scm_root = root_device_register("scm");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) if (IS_ERR(scm_root)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) bus_unregister(&scm_bus_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return PTR_ERR(scm_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) scm_update_information();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) subsys_initcall_sync(scm_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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