07be038209
To provide access to the set-partition-resource-parameter interface to user space add a new attribute to hypfs/debugfs: * s390_hypsfs/diag_304 The data for the query-partition-resource-parameters command can be access by a read on the attribute. All other diagnose 0x304 requests need to be submitted via ioctl with CAP_SYS_ADMIN rights. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
/*
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* Hypervisor filesystem for Linux on s390.
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* Set Partition-Resource Parameter interface.
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*
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* Copyright IBM Corp. 2013
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <linux/compat.h>
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#include <linux/errno.h>
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#include <linux/gfp.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <asm/compat.h>
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#include <asm/sclp.h>
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#include "hypfs.h"
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#define DIAG304_SET_WEIGHTS 0
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#define DIAG304_QUERY_PRP 1
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#define DIAG304_SET_CAPPING 2
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#define DIAG304_CMD_MAX 2
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static unsigned long hypfs_sprp_diag304(void *data, unsigned long cmd)
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{
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register unsigned long _data asm("2") = (unsigned long) data;
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register unsigned long _rc asm("3");
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register unsigned long _cmd asm("4") = cmd;
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asm volatile("diag %1,%2,0x304\n"
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: "=d" (_rc) : "d" (_data), "d" (_cmd) : "memory");
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return _rc;
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}
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static void hypfs_sprp_free(const void *data)
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{
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free_page((unsigned long) data);
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}
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static int hypfs_sprp_create(void **data_ptr, void **free_ptr, size_t *size)
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{
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unsigned long rc;
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void *data;
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data = (void *) get_zeroed_page(GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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rc = hypfs_sprp_diag304(data, DIAG304_QUERY_PRP);
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if (rc != 1) {
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*data_ptr = *free_ptr = NULL;
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*size = 0;
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free_page((unsigned long) data);
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return -EIO;
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}
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*data_ptr = *free_ptr = data;
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*size = PAGE_SIZE;
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return 0;
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}
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static int __hypfs_sprp_ioctl(void __user *user_area)
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{
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struct hypfs_diag304 diag304;
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unsigned long cmd;
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void __user *udata;
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void *data;
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int rc;
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if (copy_from_user(&diag304, user_area, sizeof(diag304)))
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return -EFAULT;
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if ((diag304.args[0] >> 8) != 0 || diag304.args[1] > DIAG304_CMD_MAX)
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return -EINVAL;
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data = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
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if (!data)
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return -ENOMEM;
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udata = (void __user *)(unsigned long) diag304.data;
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if (diag304.args[1] == DIAG304_SET_WEIGHTS ||
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diag304.args[1] == DIAG304_SET_CAPPING)
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if (copy_from_user(data, udata, PAGE_SIZE)) {
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rc = -EFAULT;
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goto out;
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}
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cmd = *(unsigned long *) &diag304.args[0];
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diag304.rc = hypfs_sprp_diag304(data, cmd);
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if (diag304.args[1] == DIAG304_QUERY_PRP)
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if (copy_to_user(udata, data, PAGE_SIZE)) {
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rc = -EFAULT;
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goto out;
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}
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rc = copy_to_user(user_area, &diag304, sizeof(diag304)) ? -EFAULT : 0;
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out:
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free_page((unsigned long) data);
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return rc;
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}
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static long hypfs_sprp_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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void __user *argp;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (is_compat_task())
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argp = compat_ptr(arg);
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else
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argp = (void __user *) arg;
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switch (cmd) {
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case HYPFS_DIAG304:
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return __hypfs_sprp_ioctl(argp);
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default: /* unknown ioctl number */
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return -ENOTTY;
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}
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return 0;
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}
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static struct hypfs_dbfs_file hypfs_sprp_file = {
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.name = "diag_304",
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.data_create = hypfs_sprp_create,
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.data_free = hypfs_sprp_free,
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.unlocked_ioctl = hypfs_sprp_ioctl,
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};
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int hypfs_sprp_init(void)
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{
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if (!sclp_has_sprp())
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return 0;
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return hypfs_dbfs_create_file(&hypfs_sprp_file);
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}
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void hypfs_sprp_exit(void)
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{
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if (!sclp_has_sprp())
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return;
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hypfs_dbfs_remove_file(&hypfs_sprp_file);
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}
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