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