^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Hypervisor filesystem for Linux on s390.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Set Partition-Resource Parameter interface.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright IBM Corp. 2013
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/diag.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/sclp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "hypfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define DIAG304_SET_WEIGHTS 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define DIAG304_QUERY_PRP 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define DIAG304_SET_CAPPING 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define DIAG304_CMD_MAX 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static inline unsigned long __hypfs_sprp_diag304(void *data, unsigned long cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) register unsigned long _data asm("2") = (unsigned long) data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) register unsigned long _rc asm("3");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) register unsigned long _cmd asm("4") = cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) asm volatile("diag %1,%2,0x304\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) : "=d" (_rc) : "d" (_data), "d" (_cmd) : "memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) return _rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static unsigned long hypfs_sprp_diag304(void *data, unsigned long cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) diag_stat_inc(DIAG_STAT_X304);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return __hypfs_sprp_diag304(data, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static void hypfs_sprp_free(const void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) free_page((unsigned long) data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static int hypfs_sprp_create(void **data_ptr, void **free_ptr, size_t *size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) unsigned long rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) void *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) data = (void *) get_zeroed_page(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) rc = hypfs_sprp_diag304(data, DIAG304_QUERY_PRP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (rc != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) *data_ptr = *free_ptr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) *size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) free_page((unsigned long) data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) *data_ptr = *free_ptr = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) *size = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static int __hypfs_sprp_ioctl(void __user *user_area)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct hypfs_diag304 *diag304;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) unsigned long cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) void __user *udata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) void *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) diag304 = kzalloc(sizeof(*diag304), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (!data || !diag304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) rc = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (copy_from_user(diag304, user_area, sizeof(*diag304)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if ((diag304->args[0] >> 8) != 0 || diag304->args[1] > DIAG304_CMD_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) rc = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) udata = (void __user *)(unsigned long) diag304->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (diag304->args[1] == DIAG304_SET_WEIGHTS ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) diag304->args[1] == DIAG304_SET_CAPPING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (copy_from_user(data, udata, PAGE_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) cmd = *(unsigned long *) &diag304->args[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) diag304->rc = hypfs_sprp_diag304(data, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (diag304->args[1] == DIAG304_QUERY_PRP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (copy_to_user(udata, data, PAGE_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) rc = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) rc = copy_to_user(user_area, diag304, sizeof(*diag304)) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) kfree(diag304);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) free_page((unsigned long) data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static long hypfs_sprp_ioctl(struct file *file, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) void __user *argp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (is_compat_task())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) argp = compat_ptr(arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) argp = (void __user *) arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) case HYPFS_DIAG304:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return __hypfs_sprp_ioctl(argp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) default: /* unknown ioctl number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static struct hypfs_dbfs_file hypfs_sprp_file = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) .name = "diag_304",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) .data_create = hypfs_sprp_create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) .data_free = hypfs_sprp_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) .unlocked_ioctl = hypfs_sprp_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) void hypfs_sprp_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (!sclp.has_sprp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) hypfs_dbfs_create_file(&hypfs_sprp_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) void hypfs_sprp_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (!sclp.has_sprp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) hypfs_dbfs_remove_file(&hypfs_sprp_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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