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 notify(struct scm_device *scmdev) 17 { 18 pr_info("%lu: The capabilities of the SCM increment changed\n", 19 (unsigned long) scmdev->address); 20 SCM_LOG(2, "State changed"); 21 SCM_LOG_STATE(2, scmdev); 22 } 23 24 static int scm_probe(struct scm_device *scmdev) 25 { 26 struct scm_blk_dev *bdev; 27 int ret; 28 29 SCM_LOG(2, "probe"); 30 SCM_LOG_STATE(2, scmdev); 31 32 if (scmdev->attrs.oper_state != OP_STATE_GOOD) 33 return -EINVAL; 34 35 bdev = kzalloc(sizeof(*bdev), GFP_KERNEL); 36 if (!bdev) 37 return -ENOMEM; 38 39 dev_set_drvdata(&scmdev->dev, bdev); 40 ret = scm_blk_dev_setup(bdev, scmdev); 41 if (ret) { 42 dev_set_drvdata(&scmdev->dev, NULL); 43 kfree(bdev); 44 goto out; 45 } 46 47 out: 48 return ret; 49 } 50 51 static int scm_remove(struct scm_device *scmdev) 52 { 53 struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev); 54 55 scm_blk_dev_cleanup(bdev); 56 dev_set_drvdata(&scmdev->dev, NULL); 57 kfree(bdev); 58 59 return 0; 60 } 61 62 static struct scm_driver scm_drv = { 63 .drv = { 64 .name = "scm_block", 65 .owner = THIS_MODULE, 66 }, 67 .notify = notify, 68 .probe = scm_probe, 69 .remove = scm_remove, 70 .handler = scm_blk_irq, 71 }; 72 73 int __init scm_drv_init(void) 74 { 75 return scm_driver_register(&scm_drv); 76 } 77 78 void scm_drv_cleanup(void) 79 { 80 scm_driver_unregister(&scm_drv); 81 } 82