diff options
Diffstat (limited to 'arch/powerpc/kernel/lparcfg.c')
-rw-r--r-- | arch/powerpc/kernel/lparcfg.c | 608 |
1 files changed, 608 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/lparcfg.c b/arch/powerpc/kernel/lparcfg.c new file mode 100644 index 00000000000..9dda16ccde7 --- /dev/null +++ b/arch/powerpc/kernel/lparcfg.c @@ -0,0 +1,608 @@ +/* + * 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/vdso_datapage.h> + +#define MODULE_VERS "1.6" +#define MODULE_NAME "lparcfg" + +/* #define LPARCFG_DEBUG */ + +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. + */ +/* find a better place for this function... */ +static 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); + +} + +/* + * 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); + + if (rc != H_Authority) + log_plpar_hcall_return(rc, "H_PIC"); +} + +/* 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); +} + +/* 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 = vdso_data->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"); |