628 lines
16 KiB
C
628 lines
16 KiB
C
/*
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* PowerPC64 LPAR Configuration Information Driver
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*
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* Dave Engebretsen engebret@us.ibm.com
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* Copyright (c) 2003 Dave Engebretsen
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* Will Schmidt willschm@us.ibm.com
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* SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
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* seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
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* Nathan Lynch nathanl@austin.ibm.com
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* Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* This driver creates a proc file at /proc/ppc64/lparcfg which contains
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* keyword - value pairs that specify the configuration of the partition.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <asm/uaccess.h>
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#include <asm/iseries/hv_lp_config.h>
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#include <asm/lppaca.h>
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#include <asm/hvcall.h>
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#include <asm/firmware.h>
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#include <asm/rtas.h>
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#include <asm/system.h>
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#include <asm/time.h>
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#include <asm/prom.h>
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#include <asm/vdso_datapage.h>
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#define MODULE_VERS "1.7"
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#define MODULE_NAME "lparcfg"
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/* #define LPARCFG_DEBUG */
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static struct proc_dir_entry *proc_ppc64_lparcfg;
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#define LPARCFG_BUFF_SIZE 4096
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/*
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* Track sum of all purrs across all processors. This is used to further
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* calculate usage values by different applications
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*/
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static unsigned long get_purr(void)
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{
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unsigned long sum_purr = 0;
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int cpu;
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for_each_possible_cpu(cpu) {
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if (firmware_has_feature(FW_FEATURE_ISERIES))
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sum_purr += lppaca[cpu].emulated_time_base;
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else {
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struct cpu_usage *cu;
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cu = &per_cpu(cpu_usage_array, cpu);
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sum_purr += cu->current_tb;
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}
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}
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return sum_purr;
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}
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#ifdef CONFIG_PPC_ISERIES
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/*
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* Methods used to fetch LPAR data when running on an iSeries platform.
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*/
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static int iseries_lparcfg_data(struct seq_file *m, void *v)
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{
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unsigned long pool_id;
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int shared, entitled_capacity, max_entitled_capacity;
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int processors, max_processors;
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unsigned long purr = get_purr();
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shared = (int)(get_lppaca()->shared_proc);
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seq_printf(m, "system_active_processors=%d\n",
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(int)HvLpConfig_getSystemPhysicalProcessors());
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seq_printf(m, "system_potential_processors=%d\n",
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(int)HvLpConfig_getSystemPhysicalProcessors());
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processors = (int)HvLpConfig_getPhysicalProcessors();
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seq_printf(m, "partition_active_processors=%d\n", processors);
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max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
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seq_printf(m, "partition_potential_processors=%d\n", max_processors);
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if (shared) {
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entitled_capacity = HvLpConfig_getSharedProcUnits();
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max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
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} else {
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entitled_capacity = processors * 100;
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max_entitled_capacity = max_processors * 100;
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}
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seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
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seq_printf(m, "partition_max_entitled_capacity=%d\n",
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max_entitled_capacity);
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if (shared) {
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pool_id = HvLpConfig_getSharedPoolIndex();
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seq_printf(m, "pool=%d\n", (int)pool_id);
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seq_printf(m, "pool_capacity=%d\n",
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(int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
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100));
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seq_printf(m, "purr=%ld\n", purr);
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}
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seq_printf(m, "shared_processor_mode=%d\n", shared);
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return 0;
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}
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#else /* CONFIG_PPC_ISERIES */
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static int iseries_lparcfg_data(struct seq_file *m, void *v)
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{
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return 0;
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}
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#endif /* CONFIG_PPC_ISERIES */
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#ifdef CONFIG_PPC_PSERIES
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/*
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* Methods used to fetch LPAR data when running on a pSeries platform.
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*/
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static void log_plpar_hcall_return(unsigned long rc, char *tag)
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{
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switch(rc) {
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case 0:
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return;
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case H_HARDWARE:
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printk(KERN_INFO "plpar-hcall (%s) "
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"Hardware fault\n", tag);
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return;
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case H_FUNCTION:
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printk(KERN_INFO "plpar-hcall (%s) "
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"Function not allowed\n", tag);
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return;
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case H_AUTHORITY:
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printk(KERN_INFO "plpar-hcall (%s) "
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"Not authorized to this function\n", tag);
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return;
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case H_PARAMETER:
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printk(KERN_INFO "plpar-hcall (%s) "
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"Bad parameter(s)\n",tag);
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return;
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default:
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printk(KERN_INFO "plpar-hcall (%s) "
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"Unexpected rc(0x%lx)\n", tag, rc);
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}
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}
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/*
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* H_GET_PPP hcall returns info in 4 parms.
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* entitled_capacity,unallocated_capacity,
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* aggregation, resource_capability).
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*
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* R4 = Entitled Processor Capacity Percentage.
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* R5 = Unallocated Processor Capacity Percentage.
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* R6 (AABBCCDDEEFFGGHH).
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* XXXX - reserved (0)
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* XXXX - reserved (0)
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* XXXX - Group Number
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* XXXX - Pool Number.
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* R7 (IIJJKKLLMMNNOOPP).
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* XX - reserved. (0)
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* XX - bit 0-6 reserved (0). bit 7 is Capped indicator.
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* XX - variable processor Capacity Weight
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* XX - Unallocated Variable Processor Capacity Weight.
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* XXXX - Active processors in Physical Processor Pool.
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* XXXX - Processors active on platform.
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*/
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static unsigned int h_get_ppp(unsigned long *entitled,
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unsigned long *unallocated,
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unsigned long *aggregation,
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unsigned long *resource)
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{
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unsigned long rc;
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
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rc = plpar_hcall(H_GET_PPP, retbuf);
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*entitled = retbuf[0];
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*unallocated = retbuf[1];
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*aggregation = retbuf[2];
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*resource = retbuf[3];
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log_plpar_hcall_return(rc, "H_GET_PPP");
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return rc;
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}
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static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
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{
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unsigned long rc;
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
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rc = plpar_hcall(H_PIC, retbuf);
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*pool_idle_time = retbuf[0];
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*num_procs = retbuf[1];
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if (rc != H_AUTHORITY)
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log_plpar_hcall_return(rc, "H_PIC");
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}
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#define SPLPAR_CHARACTERISTICS_TOKEN 20
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#define SPLPAR_MAXLENGTH 1026*(sizeof(char))
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/*
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* parse_system_parameter_string()
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* Retrieve the potential_processors, max_entitled_capacity and friends
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* through the get-system-parameter rtas call. Replace keyword strings as
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* necessary.
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*/
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static void parse_system_parameter_string(struct seq_file *m)
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{
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int call_status;
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unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
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if (!local_buffer) {
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printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
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__FILE__, __FUNCTION__, __LINE__);
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return;
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}
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spin_lock(&rtas_data_buf_lock);
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memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
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call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
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NULL,
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SPLPAR_CHARACTERISTICS_TOKEN,
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__pa(rtas_data_buf),
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RTAS_DATA_BUF_SIZE);
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memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
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spin_unlock(&rtas_data_buf_lock);
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if (call_status != 0) {
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printk(KERN_INFO
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"%s %s Error calling get-system-parameter (0x%x)\n",
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__FILE__, __FUNCTION__, call_status);
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} else {
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int splpar_strlen;
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int idx, w_idx;
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char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
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if (!workbuffer) {
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printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
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__FILE__, __FUNCTION__, __LINE__);
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kfree(local_buffer);
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return;
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}
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#ifdef LPARCFG_DEBUG
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printk(KERN_INFO "success calling get-system-parameter \n");
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#endif
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splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
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local_buffer += 2; /* step over strlen value */
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memset(workbuffer, 0, SPLPAR_MAXLENGTH);
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w_idx = 0;
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idx = 0;
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while ((*local_buffer) && (idx < splpar_strlen)) {
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workbuffer[w_idx++] = local_buffer[idx++];
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if ((local_buffer[idx] == ',')
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|| (local_buffer[idx] == '\0')) {
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workbuffer[w_idx] = '\0';
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if (w_idx) {
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/* avoid the empty string */
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seq_printf(m, "%s\n", workbuffer);
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}
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memset(workbuffer, 0, SPLPAR_MAXLENGTH);
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idx++; /* skip the comma */
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w_idx = 0;
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} else if (local_buffer[idx] == '=') {
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/* code here to replace workbuffer contents
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with different keyword strings */
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if (0 == strcmp(workbuffer, "MaxEntCap")) {
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strcpy(workbuffer,
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"partition_max_entitled_capacity");
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w_idx = strlen(workbuffer);
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}
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if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
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strcpy(workbuffer,
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"system_potential_processors");
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w_idx = strlen(workbuffer);
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}
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}
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}
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kfree(workbuffer);
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local_buffer -= 2; /* back up over strlen value */
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}
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kfree(local_buffer);
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}
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/* Return the number of processors in the system.
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* This function reads through the device tree and counts
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* the virtual processors, this does not include threads.
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*/
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static int lparcfg_count_active_processors(void)
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{
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struct device_node *cpus_dn = NULL;
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int count = 0;
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while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
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#ifdef LPARCFG_DEBUG
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printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
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#endif
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count++;
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}
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return count;
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}
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static int pseries_lparcfg_data(struct seq_file *m, void *v)
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{
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int partition_potential_processors;
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int partition_active_processors;
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struct device_node *rtas_node;
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const int *lrdrp = NULL;
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rtas_node = of_find_node_by_path("/rtas");
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if (rtas_node)
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lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
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if (lrdrp == NULL) {
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partition_potential_processors = vdso_data->processorCount;
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} else {
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partition_potential_processors = *(lrdrp + 4);
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}
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of_node_put(rtas_node);
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partition_active_processors = lparcfg_count_active_processors();
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if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
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unsigned long h_entitled, h_unallocated;
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unsigned long h_aggregation, h_resource;
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unsigned long pool_idle_time, pool_procs;
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unsigned long purr;
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h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
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&h_resource);
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seq_printf(m, "R4=0x%lx\n", h_entitled);
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seq_printf(m, "R5=0x%lx\n", h_unallocated);
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seq_printf(m, "R6=0x%lx\n", h_aggregation);
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seq_printf(m, "R7=0x%lx\n", h_resource);
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purr = get_purr();
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/* this call handles the ibm,get-system-parameter contents */
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parse_system_parameter_string(m);
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seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
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seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
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seq_printf(m, "system_active_processors=%ld\n",
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(h_resource >> 0 * 8) & 0xffff);
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/* pool related entries are apropriate for shared configs */
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if (lppaca[0].shared_proc) {
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h_pic(&pool_idle_time, &pool_procs);
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seq_printf(m, "pool=%ld\n",
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(h_aggregation >> 0 * 8) & 0xffff);
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/* report pool_capacity in percentage */
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seq_printf(m, "pool_capacity=%ld\n",
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((h_resource >> 2 * 8) & 0xffff) * 100);
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seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
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seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
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}
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seq_printf(m, "unallocated_capacity_weight=%ld\n",
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(h_resource >> 4 * 8) & 0xFF);
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seq_printf(m, "capacity_weight=%ld\n",
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(h_resource >> 5 * 8) & 0xFF);
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seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
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seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
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seq_printf(m, "purr=%ld\n", purr);
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} else { /* non SPLPAR case */
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seq_printf(m, "system_active_processors=%d\n",
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partition_potential_processors);
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seq_printf(m, "system_potential_processors=%d\n",
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partition_potential_processors);
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seq_printf(m, "partition_max_entitled_capacity=%d\n",
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partition_potential_processors * 100);
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seq_printf(m, "partition_entitled_capacity=%d\n",
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partition_active_processors * 100);
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}
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seq_printf(m, "partition_active_processors=%d\n",
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partition_active_processors);
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seq_printf(m, "partition_potential_processors=%d\n",
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partition_potential_processors);
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seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
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return 0;
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}
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/*
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* Interface for changing system parameters (variable capacity weight
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* and entitled capacity). Format of input is "param_name=value";
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* anything after value is ignored. Valid parameters at this time are
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* "partition_entitled_capacity" and "capacity_weight". We use
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* H_SET_PPP to alter parameters.
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*
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* This function should be invoked only on systems with
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* FW_FEATURE_SPLPAR.
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*/
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static ssize_t lparcfg_write(struct file *file, const char __user * buf,
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size_t count, loff_t * off)
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{
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char *kbuf;
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char *tmp;
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u64 new_entitled, *new_entitled_ptr = &new_entitled;
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u8 new_weight, *new_weight_ptr = &new_weight;
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unsigned long current_entitled; /* parameters for h_get_ppp */
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unsigned long dummy;
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unsigned long resource;
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u8 current_weight;
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ssize_t retval = -ENOMEM;
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if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
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firmware_has_feature(FW_FEATURE_ISERIES))
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return -EINVAL;
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kbuf = kmalloc(count, GFP_KERNEL);
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if (!kbuf)
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goto out;
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retval = -EFAULT;
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if (copy_from_user(kbuf, buf, count))
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goto out;
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retval = -EINVAL;
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kbuf[count - 1] = '\0';
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tmp = strchr(kbuf, '=');
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if (!tmp)
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goto out;
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*tmp++ = '\0';
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if (!strcmp(kbuf, "partition_entitled_capacity")) {
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char *endp;
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*new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
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if (endp == tmp)
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goto out;
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new_weight_ptr = ¤t_weight;
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} else if (!strcmp(kbuf, "capacity_weight")) {
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char *endp;
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*new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
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if (endp == tmp)
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goto out;
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new_entitled_ptr = ¤t_entitled;
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} else
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goto out;
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/* Get our current parameters */
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retval = h_get_ppp(¤t_entitled, &dummy, &dummy, &resource);
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if (retval) {
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retval = -EIO;
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goto out;
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}
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current_weight = (resource >> 5 * 8) & 0xFF;
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pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
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__FUNCTION__, current_entitled, current_weight);
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pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
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__FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
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retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
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*new_weight_ptr);
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if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
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retval = count;
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} else if (retval == H_BUSY) {
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retval = -EBUSY;
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} else if (retval == H_HARDWARE) {
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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;
|
|
}
|
|
|
|
#else /* CONFIG_PPC_PSERIES */
|
|
|
|
static int pseries_lparcfg_data(struct seq_file *m, void *v)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t lparcfg_write(struct file *file, const char __user * buf,
|
|
size_t count, loff_t * off)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
#endif /* CONFIG_PPC_PSERIES */
|
|
|
|
static int lparcfg_data(struct seq_file *m, void *v)
|
|
{
|
|
struct device_node *rootdn;
|
|
const char *model = "";
|
|
const char *system_id = "";
|
|
const char *tmp;
|
|
const unsigned int *lp_index_ptr;
|
|
unsigned int lp_index = 0;
|
|
|
|
seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
|
|
|
|
rootdn = of_find_node_by_path("/");
|
|
if (rootdn) {
|
|
tmp = of_get_property(rootdn, "model", NULL);
|
|
if (tmp) {
|
|
model = tmp;
|
|
/* Skip "IBM," - see platforms/iseries/dt.c */
|
|
if (firmware_has_feature(FW_FEATURE_ISERIES))
|
|
model += 4;
|
|
}
|
|
tmp = of_get_property(rootdn, "system-id", NULL);
|
|
if (tmp) {
|
|
system_id = tmp;
|
|
/* Skip "IBM," - see platforms/iseries/dt.c */
|
|
if (firmware_has_feature(FW_FEATURE_ISERIES))
|
|
system_id += 4;
|
|
}
|
|
lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
|
|
NULL);
|
|
if (lp_index_ptr)
|
|
lp_index = *lp_index_ptr;
|
|
of_node_put(rootdn);
|
|
}
|
|
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);
|
|
|
|
if (firmware_has_feature(FW_FEATURE_ISERIES))
|
|
return iseries_lparcfg_data(m, v);
|
|
return pseries_lparcfg_data(m, v);
|
|
}
|
|
|
|
static int lparcfg_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, lparcfg_data, NULL);
|
|
}
|
|
|
|
const struct file_operations lparcfg_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = seq_read,
|
|
.write = lparcfg_write,
|
|
.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) &&
|
|
!firmware_has_feature(FW_FEATURE_ISERIES))
|
|
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");
|