/*
* PowerPC64 LPAR Configuration Information Driver
*
* Dave Engebretsen engebret@us.ibm.com
* Copyright (c) 2003 Dave Engebretsen
* Will Schmidt willschm@us.ibm.com
* SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
* seq_file updates, Copyright (c) 2004 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
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* This driver creates a proc file at /proc/ppc64/lparcfg which contains
* keyword - value pairs that specify the configuration of the partition.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/lppaca.h>
#include <asm/hvcall.h>
#include <asm/firmware.h>
#include <asm/rtas.h>
#include <asm/system.h>
#include <asm/time.h>
#include <asm/iseries/it_exp_vpd_panel.h>
#include <asm/prom.h>
#include <asm/systemcfg.h>
#define MODULE_VERS "1.6"
#define MODULE_NAME "lparcfg"
/* #define LPARCFG_DEBUG */
/* find a better place for this function... */
void log_plpar_hcall_return(unsigned long rc, char *tag)
{
if (rc == 0) /* success, return */
return;
/* check for null tag ? */
if (rc == H_Hardware)
printk(KERN_INFO
"plpar-hcall (%s) failed with hardware fault\n", tag);
else if (rc == H_Function)
printk(KERN_INFO
"plpar-hcall (%s) failed; function not allowed\n", tag);
else if (rc == H_Authority)
printk(KERN_INFO
"plpar-hcall (%s) failed; not authorized to this function\n",
tag);
else if (rc == H_Parameter)
printk(KERN_INFO "plpar-hcall (%s) failed; Bad parameter(s)\n",
tag);
else
printk(KERN_INFO
"plpar-hcall (%s) failed with unexpected rc(0x%lx)\n",
tag, rc);
}
static struct proc_dir_entry *proc_ppc64_lparcfg;
#define LPARCFG_BUFF_SIZE 4096
#ifdef CONFIG_PPC_ISERIES
/*
* For iSeries legacy systems, the PPA purr function is available from the
* emulated_time_base field in the paca.
*/
static unsigned long get_purr(void)
{
unsigned long sum_purr = 0;
int cpu;
struct paca_struct *lpaca;
for_each_cpu(cpu) {
lpaca = paca + cpu;
sum_purr += lpaca->lppaca.emulated_time_base;
#ifdef PURR_DEBUG
printk(KERN_INFO "get_purr for cpu (%d) has value (%ld) \n",
cpu, lpaca->lppaca.emulated_time_base);
#endif
}
return sum_purr;
}
#define lparcfg_write NULL
/*
* Methods used to fetch LPAR data when running on an iSeries platform.
*/
static int lparcfg_data(struct seq_file *m, void *v)
{
unsigned long pool_id, lp_index;
int shared, entitled_capacity, max_entitled_capacity;
int processors, max_processors;
struct paca_struct *lpaca = get_paca();
unsigned long purr = get_purr();
seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
shared = (int)(lpaca->lppaca_ptr->shared_proc);
seq_printf(m, "serial_number=%c%c%c%c%c%c%c\n",
e2a(xItExtVpdPanel.mfgID[2]),
e2a(xItExtVpdPanel.mfgID[3]),
e2a(xItExtVpdPanel.systemSerial[1]),
e2a(xItExtVpdPanel.systemSerial[2]),
e2a(xItExtVpdPanel.systemSerial[3]),
e2a(xItExtVpdPanel.systemSerial[4]),
e2a(xItExtVpdPanel.systemSerial[5]));
seq_printf(m, "system_type=%c%c%c%c\n",
e2a(xItExtVpdPanel.machineType[0]),
e2a(xItExtVpdPanel.machineType[1]),
e2a(xItExtVpdPanel.machineType[2]),
e2a(xItExtVpdPanel.machineType[3]));
lp_index = HvLpConfig_getLpIndex();
seq_printf(m, "partition_id=%d\n", (int)lp_index);
seq_printf(m, "system_active_processors=%d\n",
(int)HvLpConfig_getSystemPhysicalProcessors());
seq_printf(m, "system_potential_processors=%d\n",
(int)HvLpConfig_getSystemPhysicalProcessors());
processors = (int)HvLpConfig_getPhysicalProcessors();
seq_printf(m, "partition_active_processors=%d\n", processors);
max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
seq_printf(m, "partition_potential_processors=%d\n", max_processors);
if (shared) {
entitled_capacity = HvLpConfig_getSharedProcUnits();
max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
} else {
entitled_capacity = processors * 100;
max_entitled_capacity = max_processors * 100;
}
seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
seq_printf(m, "partition_max_entitled_capacity=%d\n",
max_entitled_capacity);
if (shared) {
pool_id = HvLpConfig_getSharedPoolIndex();
seq_printf(m, "pool=%d\n", (int)pool_id);
seq_printf(m, "pool_capacity=%d\n",
(int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
100));
seq_printf(m, "purr=%ld\n", purr);
}
seq_printf(m, "shared_processor_mode=%d\n", shared);
return 0;
}
#endif /* CONFIG_PPC_ISERIES */
#ifdef CONFIG_PPC_PSERIES
/*
* Methods used to fetch LPAR data when running on a pSeries platform.
*/
/*
* H_GET_PPP hcall returns info in 4 parms.
* entitled_capacity,unallocated_capacity,
* aggregation, resource_capability).
*
* R4 = Entitled Processor Capacity Percentage.
* R5 = Unallocated Processor Capacity Percentage.
* R6 (AABBCCDDEEFFGGHH).
* XXXX - reserved (0)
* XXXX - reserved (0)
* XXXX - Group Number
* XXXX - Pool Number.
* R7 (IIJJKKLLMMNNOOPP).
* XX - reserved. (0)
* XX - bit 0-6 reserved (0). bit 7 is Capped indicator.
* XX - variable processor Capacity Weight
* XX - Unallocated Variable Processor Capacity Weight.
* XXXX - Active processors in Physical Processor Pool.
* XXXX - Processors active on platform.
*/
static unsigned int h_get_ppp(unsigned long *entitled,
unsigned long *unallocated,
unsigned long *aggregation,
unsigned long *resource)
{
unsigned long rc;
rc = plpar_hcall_4out(H_GET_PPP, 0, 0, 0, 0, entitled, unallocated,
aggregation, resource);
log_plpar_hcall_return(rc, "H_GET_PPP");
return rc;
}
static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
{
unsigned long rc;
unsigned long dummy;
rc = plpar_hcall(H_PIC, 0, 0, 0, 0, pool_idle_time, num_procs, &dummy);
log_plpar_hcall_return(rc, "H_PIC");
}
static unsigned long get_purr(void);
/* Track sum of all purrs across all processors. This is used to further */
/* calculate usage values by different applications */
static unsigned long get_purr(void)
{
unsigned long sum_purr = 0;
int cpu;
struct cpu_usage *cu;
for_each_cpu(cpu) {
cu = &per_cpu(cpu_usage_array, cpu);
sum_purr += cu->current_tb;
}
return sum_purr;
}
#define SPLPAR_CHARACTERISTICS_TOKEN 20
#define SPLPAR_MAXLENGTH 1026*(sizeof(char))
/*
* parse_system_parameter_string()
* Retrieve the potential_processors, max_entitled_capacity and friends
* through the get-system-parameter rtas call. Replace keyword strings as
* necessary.
*/
static void parse_system_parameter_string(struct seq_file *m)
{
int call_status;
char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
if (!local_buffer) {
printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
__FILE__, __FUNCTION__, __LINE__);
return;
}
spin_lock(&rtas_data_buf_lock);
memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
NULL,
SPLPAR_CHARACTERISTICS_TOKEN,
__pa(rtas_data_buf));
memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
spin_unlock(&rtas_data_buf_lock);
if (call_status != 0) {
printk(KERN_INFO
"%s %s Error calling get-system-parameter (0x%x)\n",
__FILE__, __FUNCTION__, call_status);
} else {
int splpar_strlen;
int idx, w_idx;
char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
if (!workbuffer) {
printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
__FILE__, __FUNCTION__, __LINE__);
kfree(local_buffer);
return;
}
#ifdef LPARCFG_DEBUG
printk(KERN_INFO "success calling get-system-parameter \n");
#endif
splpar_strlen = local_buffer[0] * 16 + local_buffer[1];
local_buffer += 2; /* step over strlen value */
memset(workbuffer, 0, SPLPAR_MAXLENGTH);
w_idx = 0;
idx = 0;
while ((*local_buffer) && (idx < splpar_strlen)) {
workbuffer[w_idx++] = local_buffer[idx++];
if ((local_buffer[idx] == ',')
|| (local_buffer[idx] == '\0')) {
workbuffer[w_idx] = '\0';
if (w_idx) {
/* avoid the empty string */
seq_printf(m, "%s\n", workbuffer);
}
memset(workbuffer, 0, SPLPAR_MAXLENGTH);
idx++; /* skip the comma */
w_idx = 0;
} else if (local_buffer[idx] == '=') {
/* code here to replace workbuffer contents
with different keyword strings */
if (0 == strcmp(workbuffer, "MaxEntCap")) {
strcpy(workbuffer,
"partition_max_entitled_capacity");
w_idx = strlen(workbuffer);
}
if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
strcpy(workbuffer,
"system_potential_processors");
w_idx = strlen(workbuffer);
}
}
}
kfree(workbuffer);
local_buffer -= 2; /* back up over strlen value */
}
kfree(local_buffer);
}
static int lparcfg_count_active_processors(void);
/* Return the number of processors in the system.
* This function reads through the device tree and counts
* the virtual processors, this does not include threads.
*/
static int lparcfg_count_active_processors(void)
{
struct device_node *cpus_dn = NULL;
int count = 0;
while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
#ifdef LPARCFG_DEBUG
printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
#endif
count++;
}
return count;
}
static int lparcfg_data(struct seq_file *m, void *v)
{
int partition_potential_processors;
int partition_active_processors;
struct device_node *rootdn;
const char *model = "";
const char *system_id = "";
unsigned int *lp_index_ptr, lp_index = 0;
struct device_node *rtas_node;
int *lrdrp;
rootdn = find_path_device("/");
if (rootdn) {
model = get_property(rootdn, "model", NULL);
system_id = get_property(rootdn, "system-id", NULL);
lp_index_ptr = (unsigned int *)
get_property(rootdn, "ibm,partition-no", NULL);
if (lp_index_ptr)
lp_index = *lp_index_ptr;
}
seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
seq_printf(m, "serial_number=%s\n", system_id);
seq_printf(m, "system_type=%s\n", model);
seq_printf(m, "partition_id=%d\n", (int)lp_index);
rtas_node = find_path_device("/rtas");
lrdrp = (int *)get_property(rtas_node, "ibm,lrdr-capacity", NULL);
if (lrdrp == NULL) {
partition_potential_processors = _systemcfg->processorCount;
} else {
partition_potential_processors = *(lrdrp + 4);
}
partition_active_processors = lparcfg_count_active_processors();
if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
unsigned long h_entitled, h_unallocated;
unsigned long h_aggregation, h_resource;
unsigned long pool_idle_time, pool_procs;
unsigned long purr;
h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
&h_resource);
seq_printf(m, "R4=0x%lx\n", h_entitled);
seq_printf(m, "R5=0x%lx\n", h_unallocated);
seq_printf(m, "R6=0x%lx\n", h_aggregation);
seq_printf(m, "R7=0x%lx\n", h_resource);
purr = get_purr();
/* this call handles the ibm,get-system-parameter contents */
parse_system_parameter_string(m);
seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
seq_printf(m, "system_active_processors=%ld\n",
(h_resource >> 0 * 8) & 0xffff);
/* pool related entries are apropriate for shared configs */
if (paca[0].lppaca.shared_proc) {
h_pic(&pool_idle_time, &pool_procs);
seq_printf(m, "pool=%ld\n",
(h_aggregation >> 0 * 8) & 0xffff);
/* report pool_capacity in percentage */
seq_printf(m, "pool_capacity=%ld\n",
((h_resource >> 2 * 8) & 0xffff) * 100);
seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
}
seq_printf(m, "unallocated_capacity_weight=%ld\n",
(h_resource >> 4 * 8) & 0xFF);
seq_printf(m, "capacity_weight=%ld\n",
(h_resource >> 5 * 8) & 0xFF);
seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
seq_printf(m, "purr=%ld\n", purr);
} else { /* non SPLPAR case */
seq_printf(m, "system_active_processors=%d\n",
partition_potential_processors);
seq_printf(m, "system_potential_processors=%d\n",
partition_potential_processors);
seq_printf(m, "partition_max_entitled_capacity=%d\n",
partition_potential_processors * 100);
seq_printf(m, "partition_entitled_capacity=%d\n",
partition_active_processors * 100);
}
seq_printf(m, "partition_active_processors=%d\n",
partition_active_processors);
seq_printf(m, "partition_potential_processors=%d\n",
partition_potential_processors);
seq_printf(m, "shared_processor_mode=%d\n", paca[0].lppaca.shared_proc);
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 = ¤t_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 = ¤t_entitled;
} else
goto out;
/* Get our current parameters */
retval = h_get_ppp(¤t_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 */
static int lparcfg_open(struct inode *inode, struct file *file)
{
return single_open(file, lparcfg_data, NULL);
}
struct file_operations lparcfg_fops = {
.owner = THIS_MODULE,
.read = seq_read,
.open = lparcfg_open,
.release = single_release,
};
int __init lparcfg_init(void)
{
struct proc_dir_entry *ent;
mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
/* Allow writing if we have FW_FEATURE_SPLPAR */
if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
lparcfg_fops.write = lparcfg_write;
mode |= S_IWUSR;
}
ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
if (ent) {
ent->proc_fops = &lparcfg_fops;
ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
if (!ent->data) {
printk(KERN_ERR
"Failed to allocate buffer for lparcfg\n");
remove_proc_entry("lparcfg", ent->parent);
return -ENOMEM;
}
} else {
printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
return -EIO;
}
proc_ppc64_lparcfg = ent;
return 0;
}
void __exit lparcfg_cleanup(void)
{
if (proc_ppc64_lparcfg) {
kfree(proc_ppc64_lparcfg->data);
remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
}
}
module_init(lparcfg_init);
module_exit(lparcfg_cleanup);
MODULE_DESCRIPTION("Interface for LPAR configuration data");
MODULE_AUTHOR("Dave Engebretsen");
MODULE_LICENSE("GPL");
