Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | // SPDX-License-Identifier: GPL-2.0 /* * Hypervisor filesystem for Linux on s390. * Set Partition-Resource Parameter interface. * * Copyright IBM Corp. 2013 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> */ #include <linux/compat.h> #include <linux/errno.h> #include <linux/gfp.h> #include <linux/string.h> #include <linux/types.h> #include <linux/uaccess.h> #include <asm/diag.h> #include <asm/sclp.h> #include "hypfs.h" #define DIAG304_SET_WEIGHTS 0 #define DIAG304_QUERY_PRP 1 #define DIAG304_SET_CAPPING 2 #define DIAG304_CMD_MAX 2 static inline unsigned long __hypfs_sprp_diag304(void *data, unsigned long cmd) { union register_pair r1 = { .even = (unsigned long)data, }; asm volatile("diag %[r1],%[r3],0x304\n" : [r1] "+&d" (r1.pair) : [r3] "d" (cmd) : "memory"); return r1.odd; } static unsigned long hypfs_sprp_diag304(void *data, unsigned long cmd) { diag_stat_inc(DIAG_STAT_X304); return __hypfs_sprp_diag304(data, cmd); } static void hypfs_sprp_free(const void *data) { free_page((unsigned long) data); } static int hypfs_sprp_create(void **data_ptr, void **free_ptr, size_t *size) { unsigned long rc; void *data; data = (void *) get_zeroed_page(GFP_KERNEL); if (!data) return -ENOMEM; rc = hypfs_sprp_diag304(data, DIAG304_QUERY_PRP); if (rc != 1) { *data_ptr = *free_ptr = NULL; *size = 0; free_page((unsigned long) data); return -EIO; } *data_ptr = *free_ptr = data; *size = PAGE_SIZE; return 0; } static int __hypfs_sprp_ioctl(void __user *user_area) { struct hypfs_diag304 *diag304; unsigned long cmd; void __user *udata; void *data; int rc; rc = -ENOMEM; data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); diag304 = kzalloc(sizeof(*diag304), GFP_KERNEL); if (!data || !diag304) goto out; rc = -EFAULT; if (copy_from_user(diag304, user_area, sizeof(*diag304))) goto out; rc = -EINVAL; if ((diag304->args[0] >> 8) != 0 || diag304->args[1] > DIAG304_CMD_MAX) goto out; rc = -EFAULT; udata = (void __user *)(unsigned long) diag304->data; if (diag304->args[1] == DIAG304_SET_WEIGHTS || diag304->args[1] == DIAG304_SET_CAPPING) if (copy_from_user(data, udata, PAGE_SIZE)) goto out; cmd = *(unsigned long *) &diag304->args[0]; diag304->rc = hypfs_sprp_diag304(data, cmd); if (diag304->args[1] == DIAG304_QUERY_PRP) if (copy_to_user(udata, data, PAGE_SIZE)) { rc = -EFAULT; goto out; } rc = copy_to_user(user_area, diag304, sizeof(*diag304)) ? -EFAULT : 0; out: kfree(diag304); free_page((unsigned long) data); return rc; } static long hypfs_sprp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (is_compat_task()) argp = compat_ptr(arg); else argp = (void __user *) arg; switch (cmd) { case HYPFS_DIAG304: return __hypfs_sprp_ioctl(argp); default: /* unknown ioctl number */ return -ENOTTY; } return 0; } static struct hypfs_dbfs_file hypfs_sprp_file = { .name = "diag_304", .data_create = hypfs_sprp_create, .data_free = hypfs_sprp_free, .unlocked_ioctl = hypfs_sprp_ioctl, }; void hypfs_sprp_init(void) { if (!sclp.has_sprp) return; hypfs_dbfs_create_file(&hypfs_sprp_file); } void hypfs_sprp_exit(void) { if (!sclp.has_sprp) return; hypfs_dbfs_remove_file(&hypfs_sprp_file); } |