1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Provide diagnose information via misc device /dev/diag. 4 * 5 * Copyright IBM Corp. 2024 6 */ 7 8 #include <linux/fs.h> 9 #include <linux/init.h> 10 #include <linux/ioctl.h> 11 #include <linux/kernel.h> 12 #include <linux/miscdevice.h> 13 #include <linux/types.h> 14 15 #include <uapi/asm/diag.h> 16 #include "diag_ioctl.h" 17 18 static long diag_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 19 { 20 long rc; 21 22 switch (cmd) { 23 case DIAG324_GET_PIBLEN: 24 rc = diag324_piblen(arg); 25 break; 26 case DIAG324_GET_PIBBUF: 27 rc = diag324_pibbuf(arg); 28 break; 29 case DIAG310_GET_STRIDE: 30 rc = diag310_memtop_stride(arg); 31 break; 32 case DIAG310_GET_MEMTOPLEN: 33 rc = diag310_memtop_len(arg); 34 break; 35 case DIAG310_GET_MEMTOPBUF: 36 rc = diag310_memtop_buf(arg); 37 break; 38 default: 39 rc = -ENOIOCTLCMD; 40 break; 41 } 42 return rc; 43 } 44 45 static const struct file_operations fops = { 46 .owner = THIS_MODULE, 47 .open = nonseekable_open, 48 .unlocked_ioctl = diag_ioctl, 49 }; 50 51 static struct miscdevice diagdev = { 52 .name = "diag", 53 .minor = MISC_DYNAMIC_MINOR, 54 .fops = &fops, 55 .mode = 0444, 56 }; 57 58 static int diag_init(void) 59 { 60 return misc_register(&diagdev); 61 } 62 63 device_initcall(diag_init); 64