1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
207be0382SMartin Schwidefsky /*
307be0382SMartin Schwidefsky * Hypervisor filesystem for Linux on s390.
407be0382SMartin Schwidefsky * Set Partition-Resource Parameter interface.
507be0382SMartin Schwidefsky *
607be0382SMartin Schwidefsky * Copyright IBM Corp. 2013
707be0382SMartin Schwidefsky * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
807be0382SMartin Schwidefsky */
907be0382SMartin Schwidefsky
1007be0382SMartin Schwidefsky #include <linux/compat.h>
1107be0382SMartin Schwidefsky #include <linux/errno.h>
1207be0382SMartin Schwidefsky #include <linux/gfp.h>
1307be0382SMartin Schwidefsky #include <linux/string.h>
1407be0382SMartin Schwidefsky #include <linux/types.h>
1507be0382SMartin Schwidefsky #include <linux/uaccess.h>
161ec2772eSMartin Schwidefsky #include <asm/diag.h>
1707be0382SMartin Schwidefsky #include <asm/sclp.h>
1807be0382SMartin Schwidefsky #include "hypfs.h"
1907be0382SMartin Schwidefsky
2007be0382SMartin Schwidefsky #define DIAG304_SET_WEIGHTS 0
2107be0382SMartin Schwidefsky #define DIAG304_QUERY_PRP 1
2207be0382SMartin Schwidefsky #define DIAG304_SET_CAPPING 2
2307be0382SMartin Schwidefsky
2407be0382SMartin Schwidefsky #define DIAG304_CMD_MAX 2
2507be0382SMartin Schwidefsky
__hypfs_sprp_diag304(void * data,unsigned long cmd)261ec2772eSMartin Schwidefsky static inline unsigned long __hypfs_sprp_diag304(void *data, unsigned long cmd)
2707be0382SMartin Schwidefsky {
28*cf1ffce2SHeiko Carstens union register_pair r1 = { .even = (unsigned long)data, };
2907be0382SMartin Schwidefsky
30*cf1ffce2SHeiko Carstens asm volatile("diag %[r1],%[r3],0x304\n"
31*cf1ffce2SHeiko Carstens : [r1] "+&d" (r1.pair)
32*cf1ffce2SHeiko Carstens : [r3] "d" (cmd)
33*cf1ffce2SHeiko Carstens : "memory");
34*cf1ffce2SHeiko Carstens return r1.odd;
3507be0382SMartin Schwidefsky }
3607be0382SMartin Schwidefsky
hypfs_sprp_diag304(void * data,unsigned long cmd)371ec2772eSMartin Schwidefsky static unsigned long hypfs_sprp_diag304(void *data, unsigned long cmd)
381ec2772eSMartin Schwidefsky {
391ec2772eSMartin Schwidefsky diag_stat_inc(DIAG_STAT_X304);
401ec2772eSMartin Schwidefsky return __hypfs_sprp_diag304(data, cmd);
411ec2772eSMartin Schwidefsky }
421ec2772eSMartin Schwidefsky
hypfs_sprp_free(const void * data)4307be0382SMartin Schwidefsky static void hypfs_sprp_free(const void *data)
4407be0382SMartin Schwidefsky {
4507be0382SMartin Schwidefsky free_page((unsigned long) data);
4607be0382SMartin Schwidefsky }
4707be0382SMartin Schwidefsky
hypfs_sprp_create(void ** data_ptr,void ** free_ptr,size_t * size)4807be0382SMartin Schwidefsky static int hypfs_sprp_create(void **data_ptr, void **free_ptr, size_t *size)
4907be0382SMartin Schwidefsky {
5007be0382SMartin Schwidefsky unsigned long rc;
5107be0382SMartin Schwidefsky void *data;
5207be0382SMartin Schwidefsky
5307be0382SMartin Schwidefsky data = (void *) get_zeroed_page(GFP_KERNEL);
5407be0382SMartin Schwidefsky if (!data)
5507be0382SMartin Schwidefsky return -ENOMEM;
5607be0382SMartin Schwidefsky rc = hypfs_sprp_diag304(data, DIAG304_QUERY_PRP);
5707be0382SMartin Schwidefsky if (rc != 1) {
5807be0382SMartin Schwidefsky *data_ptr = *free_ptr = NULL;
5907be0382SMartin Schwidefsky *size = 0;
6007be0382SMartin Schwidefsky free_page((unsigned long) data);
6107be0382SMartin Schwidefsky return -EIO;
6207be0382SMartin Schwidefsky }
6307be0382SMartin Schwidefsky *data_ptr = *free_ptr = data;
6407be0382SMartin Schwidefsky *size = PAGE_SIZE;
6507be0382SMartin Schwidefsky return 0;
6607be0382SMartin Schwidefsky }
6707be0382SMartin Schwidefsky
__hypfs_sprp_ioctl(void __user * user_area)6807be0382SMartin Schwidefsky static int __hypfs_sprp_ioctl(void __user *user_area)
6907be0382SMartin Schwidefsky {
708ef9eda0SMartin Schwidefsky struct hypfs_diag304 *diag304;
7107be0382SMartin Schwidefsky unsigned long cmd;
7207be0382SMartin Schwidefsky void __user *udata;
7307be0382SMartin Schwidefsky void *data;
7407be0382SMartin Schwidefsky int rc;
7507be0382SMartin Schwidefsky
768ef9eda0SMartin Schwidefsky rc = -ENOMEM;
7707be0382SMartin Schwidefsky data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
788ef9eda0SMartin Schwidefsky diag304 = kzalloc(sizeof(*diag304), GFP_KERNEL);
798ef9eda0SMartin Schwidefsky if (!data || !diag304)
8007be0382SMartin Schwidefsky goto out;
8107be0382SMartin Schwidefsky
828ef9eda0SMartin Schwidefsky rc = -EFAULT;
838ef9eda0SMartin Schwidefsky if (copy_from_user(diag304, user_area, sizeof(*diag304)))
848ef9eda0SMartin Schwidefsky goto out;
858ef9eda0SMartin Schwidefsky rc = -EINVAL;
868ef9eda0SMartin Schwidefsky if ((diag304->args[0] >> 8) != 0 || diag304->args[1] > DIAG304_CMD_MAX)
878ef9eda0SMartin Schwidefsky goto out;
8807be0382SMartin Schwidefsky
898ef9eda0SMartin Schwidefsky rc = -EFAULT;
908ef9eda0SMartin Schwidefsky udata = (void __user *)(unsigned long) diag304->data;
918ef9eda0SMartin Schwidefsky if (diag304->args[1] == DIAG304_SET_WEIGHTS ||
928ef9eda0SMartin Schwidefsky diag304->args[1] == DIAG304_SET_CAPPING)
938ef9eda0SMartin Schwidefsky if (copy_from_user(data, udata, PAGE_SIZE))
948ef9eda0SMartin Schwidefsky goto out;
958ef9eda0SMartin Schwidefsky
968ef9eda0SMartin Schwidefsky cmd = *(unsigned long *) &diag304->args[0];
978ef9eda0SMartin Schwidefsky diag304->rc = hypfs_sprp_diag304(data, cmd);
988ef9eda0SMartin Schwidefsky
998ef9eda0SMartin Schwidefsky if (diag304->args[1] == DIAG304_QUERY_PRP)
10007be0382SMartin Schwidefsky if (copy_to_user(udata, data, PAGE_SIZE)) {
10107be0382SMartin Schwidefsky rc = -EFAULT;
10207be0382SMartin Schwidefsky goto out;
10307be0382SMartin Schwidefsky }
10407be0382SMartin Schwidefsky
1058ef9eda0SMartin Schwidefsky rc = copy_to_user(user_area, diag304, sizeof(*diag304)) ? -EFAULT : 0;
10607be0382SMartin Schwidefsky out:
1078ef9eda0SMartin Schwidefsky kfree(diag304);
10807be0382SMartin Schwidefsky free_page((unsigned long) data);
10907be0382SMartin Schwidefsky return rc;
11007be0382SMartin Schwidefsky }
11107be0382SMartin Schwidefsky
hypfs_sprp_ioctl(struct file * file,unsigned int cmd,unsigned long arg)11207be0382SMartin Schwidefsky static long hypfs_sprp_ioctl(struct file *file, unsigned int cmd,
11307be0382SMartin Schwidefsky unsigned long arg)
11407be0382SMartin Schwidefsky {
11507be0382SMartin Schwidefsky void __user *argp;
11607be0382SMartin Schwidefsky
11707be0382SMartin Schwidefsky if (!capable(CAP_SYS_ADMIN))
11807be0382SMartin Schwidefsky return -EACCES;
11907be0382SMartin Schwidefsky if (is_compat_task())
12007be0382SMartin Schwidefsky argp = compat_ptr(arg);
12107be0382SMartin Schwidefsky else
12207be0382SMartin Schwidefsky argp = (void __user *) arg;
12307be0382SMartin Schwidefsky switch (cmd) {
12407be0382SMartin Schwidefsky case HYPFS_DIAG304:
12507be0382SMartin Schwidefsky return __hypfs_sprp_ioctl(argp);
12607be0382SMartin Schwidefsky default: /* unknown ioctl number */
12707be0382SMartin Schwidefsky return -ENOTTY;
12807be0382SMartin Schwidefsky }
12907be0382SMartin Schwidefsky return 0;
13007be0382SMartin Schwidefsky }
13107be0382SMartin Schwidefsky
13207be0382SMartin Schwidefsky static struct hypfs_dbfs_file hypfs_sprp_file = {
13307be0382SMartin Schwidefsky .name = "diag_304",
13407be0382SMartin Schwidefsky .data_create = hypfs_sprp_create,
13507be0382SMartin Schwidefsky .data_free = hypfs_sprp_free,
13607be0382SMartin Schwidefsky .unlocked_ioctl = hypfs_sprp_ioctl,
13707be0382SMartin Schwidefsky };
13807be0382SMartin Schwidefsky
hypfs_sprp_init(void)139f36108c4SGreg Kroah-Hartman void hypfs_sprp_init(void)
14007be0382SMartin Schwidefsky {
14137c5f6c8SDavid Hildenbrand if (!sclp.has_sprp)
142f36108c4SGreg Kroah-Hartman return;
143f36108c4SGreg Kroah-Hartman hypfs_dbfs_create_file(&hypfs_sprp_file);
14407be0382SMartin Schwidefsky }
14507be0382SMartin Schwidefsky
hypfs_sprp_exit(void)14607be0382SMartin Schwidefsky void hypfs_sprp_exit(void)
14707be0382SMartin Schwidefsky {
14837c5f6c8SDavid Hildenbrand if (!sclp.has_sprp)
14907be0382SMartin Schwidefsky return;
15007be0382SMartin Schwidefsky hypfs_dbfs_remove_file(&hypfs_sprp_file);
15107be0382SMartin Schwidefsky }
152