Commit f18a9012 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] ppc64: lparcfg_write

From: Anton Blanchard <anton@samba.org>

Add lparcfg_write() for changing SPLPAR system parameters
parent d29df610
......@@ -5,6 +5,8 @@
* Copyright (c) 2003 Dave Engebretsen
* Will Schmidt willschm@us.ibm.com
* SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
* Nathan Lynch nathanl@austin.ibm.com
* Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
......@@ -33,6 +35,9 @@ static struct proc_dir_entry *proc_ppc64_lparcfg;
#define LPARCFG_BUFF_SIZE 4096
#ifdef CONFIG_PPC_ISERIES
#define lparcfg_write NULL
static unsigned char e2a(unsigned char x)
{
switch (x) {
......@@ -383,6 +388,99 @@ static int lparcfg_data(unsigned char *buf, unsigned long size)
}
return 0;
}
/*
* Interface for changing system parameters (variable capacity weight
* and entitled capacity). Format of input is "param_name=value";
* anything after value is ignored. Valid parameters at this time are
* "partition_entitled_capacity" and "capacity_weight". We use
* H_SET_PPP to alter parameters.
*
* This function should be invoked only on systems with
* FW_FEATURE_SPLPAR.
*/
static ssize_t lparcfg_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
{
char *kbuf;
char *tmp;
u64 new_entitled, *new_entitled_ptr = &new_entitled;
u8 new_weight, *new_weight_ptr = &new_weight;
unsigned long current_entitled; /* parameters for h_get_ppp */
unsigned long dummy;
unsigned long resource;
u8 current_weight;
ssize_t retval = -ENOMEM;
kbuf = kmalloc(count, GFP_KERNEL);
if (!kbuf)
goto out;
retval = -EFAULT;
if (copy_from_user(kbuf, buf, count))
goto out;
retval = -EINVAL;
kbuf[count - 1] = '\0';
tmp = strchr(kbuf, '=');
if (!tmp)
goto out;
*tmp++ = '\0';
if (!strcmp(kbuf, "partition_entitled_capacity")) {
char *endp;
*new_entitled_ptr = (u64)simple_strtoul(tmp, &endp, 10);
if (endp == tmp)
goto out;
new_weight_ptr = &current_weight;
} else if (!strcmp(kbuf, "capacity_weight")) {
char *endp;
*new_weight_ptr = (u8)simple_strtoul(tmp, &endp, 10);
if (endp == tmp)
goto out;
new_entitled_ptr = &current_entitled;
} else
goto out;
/* Get our current parameters */
retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
if (retval) {
retval = -EIO;
goto out;
}
current_weight = (resource>>5*8)&0xFF;
pr_debug("%s: current_entitled = %lu, current_weight = %lu\n",
__FUNCTION__, current_entitled, current_weight);
pr_debug("%s: new_entitled = %lu, new_weight = %lu\n",
__FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
*new_weight_ptr);
if (retval == H_Success || retval == H_Constrained) {
retval = count;
} else if (retval == H_Busy) {
retval = -EBUSY;
} else if (retval == H_Hardware) {
retval = -EIO;
} else if (retval == H_Parameter) {
retval = -EINVAL;
} else {
printk(KERN_WARNING "%s: received unknown hv return code %ld",
__FUNCTION__, retval);
retval = -EIO;
}
out:
kfree(kbuf);
return retval;
}
#endif /* CONFIG_PPC_PSERIES */
......@@ -442,8 +540,15 @@ struct file_operations lparcfg_fops = {
int __init lparcfg_init(void)
{
struct proc_dir_entry *ent;
mode_t mode = S_IRUSR;
/* Allow writing if we have FW_FEATURE_SPLPAR */
if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
lparcfg_fops.write = lparcfg_write;
mode |= S_IWUSR;
}
ent = create_proc_entry("ppc64/lparcfg", S_IRUSR, NULL);
ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
if (ent) {
ent->proc_fops = &lparcfg_fops;
ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
......
......@@ -3,6 +3,7 @@
#define H_Success 0
#define H_Busy 1 /* Hardware busy -- retry later */
#define H_Constrained 4 /* Resource request constrained to max allowed */
#define H_Hardware -1 /* Hardware error */
#define H_Function -2 /* Function not supported */
#define H_Privilege -3 /* Caller not privileged */
......
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