1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Device driver for s390 storage class memory. 4 * 5 * Copyright IBM Corp. 2012 6 * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com> 7 */ 8 9 #define KMSG_COMPONENT "scm_block" 10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 11 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 #include <asm/eadm.h> 15 #include "scm_blk.h" 16 17 static void scm_notify(struct scm_device *scmdev, enum scm_event event) 18 { 19 struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev); 20 21 switch (event) { 22 case SCM_CHANGE: 23 pr_info("%lx: The capabilities of the SCM increment changed\n", 24 (unsigned long) scmdev->address); 25 SCM_LOG(2, "State changed"); 26 SCM_LOG_STATE(2, scmdev); 27 break; 28 case SCM_AVAIL: 29 SCM_LOG(2, "Increment available"); 30 SCM_LOG_STATE(2, scmdev); 31 scm_blk_set_available(bdev); 32 break; 33 } 34 } 35 36 static int scm_probe(struct scm_device *scmdev) 37 { 38 struct scm_blk_dev *bdev; 39 int ret; 40 41 SCM_LOG(2, "probe"); 42 SCM_LOG_STATE(2, scmdev); 43 44 if (scmdev->attrs.oper_state != OP_STATE_GOOD) 45 return -EINVAL; 46 47 bdev = kzalloc(sizeof(*bdev), GFP_KERNEL); 48 if (!bdev) 49 return -ENOMEM; 50 51 dev_set_drvdata(&scmdev->dev, bdev); 52 ret = scm_blk_dev_setup(bdev, scmdev); 53 if (ret) { 54 dev_set_drvdata(&scmdev->dev, NULL); 55 kfree(bdev); 56 goto out; 57 } 58 59 out: 60 return ret; 61 } 62 63 static int scm_remove(struct scm_device *scmdev) 64 { 65 struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev); 66 67 scm_blk_dev_cleanup(bdev); 68 dev_set_drvdata(&scmdev->dev, NULL); 69 kfree(bdev); 70 71 return 0; 72 } 73 74 static struct scm_driver scm_drv = { 75 .drv = { 76 .name = "scm_block", 77 .owner = THIS_MODULE, 78 }, 79 .notify = scm_notify, 80 .probe = scm_probe, 81 .remove = scm_remove, 82 .handler = scm_blk_irq, 83 }; 84 85 int __init scm_drv_init(void) 86 { 87 return scm_driver_register(&scm_drv); 88 } 89 90 void scm_drv_cleanup(void) 91 { 92 scm_driver_unregister(&scm_drv); 93 } 94