107be0382SMartin Schwidefsky /* 207be0382SMartin Schwidefsky * Hypervisor filesystem for Linux on s390. 307be0382SMartin Schwidefsky * Set Partition-Resource Parameter interface. 407be0382SMartin Schwidefsky * 507be0382SMartin Schwidefsky * Copyright IBM Corp. 2013 607be0382SMartin Schwidefsky * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 707be0382SMartin Schwidefsky */ 807be0382SMartin Schwidefsky 907be0382SMartin Schwidefsky #include <linux/compat.h> 1007be0382SMartin Schwidefsky #include <linux/errno.h> 1107be0382SMartin Schwidefsky #include <linux/gfp.h> 1207be0382SMartin Schwidefsky #include <linux/string.h> 1307be0382SMartin Schwidefsky #include <linux/types.h> 1407be0382SMartin Schwidefsky #include <linux/uaccess.h> 1507be0382SMartin Schwidefsky #include <asm/compat.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 261ec2772eSMartin Schwidefsky static inline unsigned long __hypfs_sprp_diag304(void *data, unsigned long cmd) 2707be0382SMartin Schwidefsky { 2807be0382SMartin Schwidefsky register unsigned long _data asm("2") = (unsigned long) data; 2907be0382SMartin Schwidefsky register unsigned long _rc asm("3"); 3007be0382SMartin Schwidefsky register unsigned long _cmd asm("4") = cmd; 3107be0382SMartin Schwidefsky 3207be0382SMartin Schwidefsky asm volatile("diag %1,%2,0x304\n" 3307be0382SMartin Schwidefsky : "=d" (_rc) : "d" (_data), "d" (_cmd) : "memory"); 3407be0382SMartin Schwidefsky 3507be0382SMartin Schwidefsky return _rc; 3607be0382SMartin Schwidefsky } 3707be0382SMartin Schwidefsky 381ec2772eSMartin Schwidefsky static unsigned long hypfs_sprp_diag304(void *data, unsigned long cmd) 391ec2772eSMartin Schwidefsky { 401ec2772eSMartin Schwidefsky diag_stat_inc(DIAG_STAT_X304); 411ec2772eSMartin Schwidefsky return __hypfs_sprp_diag304(data, cmd); 421ec2772eSMartin Schwidefsky } 431ec2772eSMartin Schwidefsky 4407be0382SMartin Schwidefsky static void hypfs_sprp_free(const void *data) 4507be0382SMartin Schwidefsky { 4607be0382SMartin Schwidefsky free_page((unsigned long) data); 4707be0382SMartin Schwidefsky } 4807be0382SMartin Schwidefsky 4907be0382SMartin Schwidefsky static int hypfs_sprp_create(void **data_ptr, void **free_ptr, size_t *size) 5007be0382SMartin Schwidefsky { 5107be0382SMartin Schwidefsky unsigned long rc; 5207be0382SMartin Schwidefsky void *data; 5307be0382SMartin Schwidefsky 5407be0382SMartin Schwidefsky data = (void *) get_zeroed_page(GFP_KERNEL); 5507be0382SMartin Schwidefsky if (!data) 5607be0382SMartin Schwidefsky return -ENOMEM; 5707be0382SMartin Schwidefsky rc = hypfs_sprp_diag304(data, DIAG304_QUERY_PRP); 5807be0382SMartin Schwidefsky if (rc != 1) { 5907be0382SMartin Schwidefsky *data_ptr = *free_ptr = NULL; 6007be0382SMartin Schwidefsky *size = 0; 6107be0382SMartin Schwidefsky free_page((unsigned long) data); 6207be0382SMartin Schwidefsky return -EIO; 6307be0382SMartin Schwidefsky } 6407be0382SMartin Schwidefsky *data_ptr = *free_ptr = data; 6507be0382SMartin Schwidefsky *size = PAGE_SIZE; 6607be0382SMartin Schwidefsky return 0; 6707be0382SMartin Schwidefsky } 6807be0382SMartin Schwidefsky 6907be0382SMartin Schwidefsky static int __hypfs_sprp_ioctl(void __user *user_area) 7007be0382SMartin Schwidefsky { 7107be0382SMartin Schwidefsky struct hypfs_diag304 diag304; 7207be0382SMartin Schwidefsky unsigned long cmd; 7307be0382SMartin Schwidefsky void __user *udata; 7407be0382SMartin Schwidefsky void *data; 7507be0382SMartin Schwidefsky int rc; 7607be0382SMartin Schwidefsky 7707be0382SMartin Schwidefsky if (copy_from_user(&diag304, user_area, sizeof(diag304))) 7807be0382SMartin Schwidefsky return -EFAULT; 7907be0382SMartin Schwidefsky if ((diag304.args[0] >> 8) != 0 || diag304.args[1] > DIAG304_CMD_MAX) 8007be0382SMartin Schwidefsky return -EINVAL; 8107be0382SMartin Schwidefsky 8207be0382SMartin Schwidefsky data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); 8307be0382SMartin Schwidefsky if (!data) 8407be0382SMartin Schwidefsky return -ENOMEM; 8507be0382SMartin Schwidefsky 8607be0382SMartin Schwidefsky udata = (void __user *)(unsigned long) diag304.data; 8707be0382SMartin Schwidefsky if (diag304.args[1] == DIAG304_SET_WEIGHTS || 8807be0382SMartin Schwidefsky diag304.args[1] == DIAG304_SET_CAPPING) 8907be0382SMartin Schwidefsky if (copy_from_user(data, udata, PAGE_SIZE)) { 9007be0382SMartin Schwidefsky rc = -EFAULT; 9107be0382SMartin Schwidefsky goto out; 9207be0382SMartin Schwidefsky } 9307be0382SMartin Schwidefsky 9407be0382SMartin Schwidefsky cmd = *(unsigned long *) &diag304.args[0]; 9507be0382SMartin Schwidefsky diag304.rc = hypfs_sprp_diag304(data, cmd); 9607be0382SMartin Schwidefsky 9707be0382SMartin Schwidefsky if (diag304.args[1] == DIAG304_QUERY_PRP) 9807be0382SMartin Schwidefsky if (copy_to_user(udata, data, PAGE_SIZE)) { 9907be0382SMartin Schwidefsky rc = -EFAULT; 10007be0382SMartin Schwidefsky goto out; 10107be0382SMartin Schwidefsky } 10207be0382SMartin Schwidefsky 10307be0382SMartin Schwidefsky rc = copy_to_user(user_area, &diag304, sizeof(diag304)) ? -EFAULT : 0; 10407be0382SMartin Schwidefsky out: 10507be0382SMartin Schwidefsky free_page((unsigned long) data); 10607be0382SMartin Schwidefsky return rc; 10707be0382SMartin Schwidefsky } 10807be0382SMartin Schwidefsky 10907be0382SMartin Schwidefsky static long hypfs_sprp_ioctl(struct file *file, unsigned int cmd, 11007be0382SMartin Schwidefsky unsigned long arg) 11107be0382SMartin Schwidefsky { 11207be0382SMartin Schwidefsky void __user *argp; 11307be0382SMartin Schwidefsky 11407be0382SMartin Schwidefsky if (!capable(CAP_SYS_ADMIN)) 11507be0382SMartin Schwidefsky return -EACCES; 11607be0382SMartin Schwidefsky if (is_compat_task()) 11707be0382SMartin Schwidefsky argp = compat_ptr(arg); 11807be0382SMartin Schwidefsky else 11907be0382SMartin Schwidefsky argp = (void __user *) arg; 12007be0382SMartin Schwidefsky switch (cmd) { 12107be0382SMartin Schwidefsky case HYPFS_DIAG304: 12207be0382SMartin Schwidefsky return __hypfs_sprp_ioctl(argp); 12307be0382SMartin Schwidefsky default: /* unknown ioctl number */ 12407be0382SMartin Schwidefsky return -ENOTTY; 12507be0382SMartin Schwidefsky } 12607be0382SMartin Schwidefsky return 0; 12707be0382SMartin Schwidefsky } 12807be0382SMartin Schwidefsky 12907be0382SMartin Schwidefsky static struct hypfs_dbfs_file hypfs_sprp_file = { 13007be0382SMartin Schwidefsky .name = "diag_304", 13107be0382SMartin Schwidefsky .data_create = hypfs_sprp_create, 13207be0382SMartin Schwidefsky .data_free = hypfs_sprp_free, 13307be0382SMartin Schwidefsky .unlocked_ioctl = hypfs_sprp_ioctl, 13407be0382SMartin Schwidefsky }; 13507be0382SMartin Schwidefsky 13607be0382SMartin Schwidefsky int hypfs_sprp_init(void) 13707be0382SMartin Schwidefsky { 13837c5f6c8SDavid Hildenbrand if (!sclp.has_sprp) 13907be0382SMartin Schwidefsky return 0; 14007be0382SMartin Schwidefsky return hypfs_dbfs_create_file(&hypfs_sprp_file); 14107be0382SMartin Schwidefsky } 14207be0382SMartin Schwidefsky 14307be0382SMartin Schwidefsky void hypfs_sprp_exit(void) 14407be0382SMartin Schwidefsky { 14537c5f6c8SDavid Hildenbrand if (!sclp.has_sprp) 14607be0382SMartin Schwidefsky return; 14707be0382SMartin Schwidefsky hypfs_dbfs_remove_file(&hypfs_sprp_file); 14807be0382SMartin Schwidefsky } 149