1 files changed, 611 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/lparcfg.c b/arch/ppc64/kernel/lparcfg.c
new file mode 100644
index 000000000000..a8fd32df848b
--- /dev/null
+++ b/arch/ppc64/kernel/lparcfg.c
@@ -0,0 +1,611 @@
+/*
+ * 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/HvLpConfig.h>
+#include <asm/lppaca.h>
+#include <asm/iSeries/LparData.h>
+#include <asm/hvcall.h>
+#include <asm/cputable.h>
+#include <asm/rtas.h>
+#include <asm/system.h>
+#include <asm/time.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__);
+                        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 (cur_cpu_spec->firmware_features & 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;
+
+        /* 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", 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) {
+                if (proc_ppc64_lparcfg->data) {
+                        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");