107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky/* 207be0382097027cde68d9268cc628741069b5762Martin Schwidefsky * Hypervisor filesystem for Linux on s390. 307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky * Set Partition-Resource Parameter interface. 407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky * 507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky * Copyright IBM Corp. 2013 607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 707be0382097027cde68d9268cc628741069b5762Martin Schwidefsky */ 807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#include <linux/compat.h> 1007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#include <linux/errno.h> 1107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#include <linux/gfp.h> 1207be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#include <linux/string.h> 1307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#include <linux/types.h> 1407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#include <linux/uaccess.h> 1507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#include <asm/compat.h> 1607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#include <asm/sclp.h> 1707be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#include "hypfs.h" 1807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 1907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#define DIAG304_SET_WEIGHTS 0 2007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#define DIAG304_QUERY_PRP 1 2107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#define DIAG304_SET_CAPPING 2 2207be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 2307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky#define DIAG304_CMD_MAX 2 2407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 2507be0382097027cde68d9268cc628741069b5762Martin Schwidefskystatic unsigned long hypfs_sprp_diag304(void *data, unsigned long cmd) 2607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky{ 2707be0382097027cde68d9268cc628741069b5762Martin Schwidefsky register unsigned long _data asm("2") = (unsigned long) data; 2807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky register unsigned long _rc asm("3"); 2907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky register unsigned long _cmd asm("4") = cmd; 3007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 3107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky asm volatile("diag %1,%2,0x304\n" 3207be0382097027cde68d9268cc628741069b5762Martin Schwidefsky : "=d" (_rc) : "d" (_data), "d" (_cmd) : "memory"); 3307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 3407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return _rc; 3507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky} 3607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 3707be0382097027cde68d9268cc628741069b5762Martin Schwidefskystatic void hypfs_sprp_free(const void *data) 3807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky{ 3907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky free_page((unsigned long) data); 4007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky} 4107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 4207be0382097027cde68d9268cc628741069b5762Martin Schwidefskystatic int hypfs_sprp_create(void **data_ptr, void **free_ptr, size_t *size) 4307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky{ 4407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky unsigned long rc; 4507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky void *data; 4607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 4707be0382097027cde68d9268cc628741069b5762Martin Schwidefsky data = (void *) get_zeroed_page(GFP_KERNEL); 4807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if (!data) 4907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return -ENOMEM; 5007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky rc = hypfs_sprp_diag304(data, DIAG304_QUERY_PRP); 5107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if (rc != 1) { 5207be0382097027cde68d9268cc628741069b5762Martin Schwidefsky *data_ptr = *free_ptr = NULL; 5307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky *size = 0; 5407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky free_page((unsigned long) data); 5507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return -EIO; 5607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky } 5707be0382097027cde68d9268cc628741069b5762Martin Schwidefsky *data_ptr = *free_ptr = data; 5807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky *size = PAGE_SIZE; 5907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return 0; 6007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky} 6107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 6207be0382097027cde68d9268cc628741069b5762Martin Schwidefskystatic int __hypfs_sprp_ioctl(void __user *user_area) 6307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky{ 6407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky struct hypfs_diag304 diag304; 6507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky unsigned long cmd; 6607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky void __user *udata; 6707be0382097027cde68d9268cc628741069b5762Martin Schwidefsky void *data; 6807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky int rc; 6907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 7007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if (copy_from_user(&diag304, user_area, sizeof(diag304))) 7107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return -EFAULT; 7207be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if ((diag304.args[0] >> 8) != 0 || diag304.args[1] > DIAG304_CMD_MAX) 7307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return -EINVAL; 7407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 7507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 7607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if (!data) 7707be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return -ENOMEM; 7807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 7907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky udata = (void __user *)(unsigned long) diag304.data; 8007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if (diag304.args[1] == DIAG304_SET_WEIGHTS || 8107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky diag304.args[1] == DIAG304_SET_CAPPING) 8207be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if (copy_from_user(data, udata, PAGE_SIZE)) { 8307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky rc = -EFAULT; 8407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky goto out; 8507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky } 8607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 8707be0382097027cde68d9268cc628741069b5762Martin Schwidefsky cmd = *(unsigned long *) &diag304.args[0]; 8807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky diag304.rc = hypfs_sprp_diag304(data, cmd); 8907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 9007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if (diag304.args[1] == DIAG304_QUERY_PRP) 9107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if (copy_to_user(udata, data, PAGE_SIZE)) { 9207be0382097027cde68d9268cc628741069b5762Martin Schwidefsky rc = -EFAULT; 9307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky goto out; 9407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky } 9507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 9607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky rc = copy_to_user(user_area, &diag304, sizeof(diag304)) ? -EFAULT : 0; 9707be0382097027cde68d9268cc628741069b5762Martin Schwidefskyout: 9807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky free_page((unsigned long) data); 9907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return rc; 10007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky} 10107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 10207be0382097027cde68d9268cc628741069b5762Martin Schwidefskystatic long hypfs_sprp_ioctl(struct file *file, unsigned int cmd, 10307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky unsigned long arg) 10407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky{ 10507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky void __user *argp; 10607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 10707be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if (!capable(CAP_SYS_ADMIN)) 10807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return -EACCES; 10907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if (is_compat_task()) 11007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky argp = compat_ptr(arg); 11107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky else 11207be0382097027cde68d9268cc628741069b5762Martin Schwidefsky argp = (void __user *) arg; 11307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky switch (cmd) { 11407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky case HYPFS_DIAG304: 11507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return __hypfs_sprp_ioctl(argp); 11607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky default: /* unknown ioctl number */ 11707be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return -ENOTTY; 11807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky } 11907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return 0; 12007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky} 12107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 12207be0382097027cde68d9268cc628741069b5762Martin Schwidefskystatic struct hypfs_dbfs_file hypfs_sprp_file = { 12307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky .name = "diag_304", 12407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky .data_create = hypfs_sprp_create, 12507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky .data_free = hypfs_sprp_free, 12607be0382097027cde68d9268cc628741069b5762Martin Schwidefsky .unlocked_ioctl = hypfs_sprp_ioctl, 12707be0382097027cde68d9268cc628741069b5762Martin Schwidefsky}; 12807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 12907be0382097027cde68d9268cc628741069b5762Martin Schwidefskyint hypfs_sprp_init(void) 13007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky{ 13107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if (!sclp_has_sprp()) 13207be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return 0; 13307be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return hypfs_dbfs_create_file(&hypfs_sprp_file); 13407be0382097027cde68d9268cc628741069b5762Martin Schwidefsky} 13507be0382097027cde68d9268cc628741069b5762Martin Schwidefsky 13607be0382097027cde68d9268cc628741069b5762Martin Schwidefskyvoid hypfs_sprp_exit(void) 13707be0382097027cde68d9268cc628741069b5762Martin Schwidefsky{ 13807be0382097027cde68d9268cc628741069b5762Martin Schwidefsky if (!sclp_has_sprp()) 13907be0382097027cde68d9268cc628741069b5762Martin Schwidefsky return; 14007be0382097027cde68d9268cc628741069b5762Martin Schwidefsky hypfs_dbfs_remove_file(&hypfs_sprp_file); 14107be0382097027cde68d9268cc628741069b5762Martin Schwidefsky} 142