// SPDX-License-Identifier: GPL-2.0 /* * Provide diagnose information via misc device /dev/diag. * * Copyright IBM Corp. 2024 */ #include <linux/fs.h> #include <linux/init.h> #include <linux/ioctl.h> #include <linux/kernel.h> #include <linux/miscdevice.h> #include <linux/types.h> #include <uapi/asm/diag.h> #include "diag_ioctl.h" static long diag_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { long rc; switch (cmd) { case DIAG324_GET_PIBLEN: rc = diag324_piblen(arg); break; case DIAG324_GET_PIBBUF: rc = diag324_pibbuf(arg); break; case DIAG310_GET_STRIDE: rc = diag310_memtop_stride(arg); break; case DIAG310_GET_MEMTOPLEN: rc = diag310_memtop_len(arg); break; case DIAG310_GET_MEMTOPBUF: rc = diag310_memtop_buf(arg); break; default: rc = -ENOIOCTLCMD; break; } return rc; } static const struct file_operations fops = { .owner = THIS_MODULE, .open = nonseekable_open, .unlocked_ioctl = diag_ioctl, }; static struct miscdevice diagdev = { .name = "diag", .minor = MISC_DYNAMIC_MINOR, .fops = &fops, .mode = 0444, }; static int diag_init(void) { return misc_register(&diagdev); } device_initcall(diag_init);