summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/lparcfg.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/kernel/lparcfg.c')
-rw-r--r--arch/powerpc/kernel/lparcfg.c612
1 files changed, 612 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/lparcfg.c b/arch/powerpc/kernel/lparcfg.c
new file mode 100644
index 000000000000..5e954fae031f
--- /dev/null
+++ b/arch/powerpc/kernel/lparcfg.c
@@ -0,0 +1,612 @@
+/*
+ * 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 = &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 */
+
+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");
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-02 18:45:15 +0000