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lparcfg.c

/*
 * 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/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/prom.h>
#include <asm/vdso_datapage.h>

#define MODULE_VERS "1.7"
#define MODULE_NAME "lparcfg"

/* #define LPARCFG_DEBUG */

static struct proc_dir_entry *proc_ppc64_lparcfg;
#define LPARCFG_BUFF_SIZE 4096

/*
 * 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;

      for_each_possible_cpu(cpu) {
            if (firmware_has_feature(FW_FEATURE_ISERIES))
                  sum_purr += lppaca[cpu].emulated_time_base;
            else {
                  struct cpu_usage *cu;

                  cu = &per_cpu(cpu_usage_array, cpu);
                  sum_purr += cu->current_tb;
            }
      }
      return sum_purr;
}

#ifdef CONFIG_PPC_ISERIES

/*
 * Methods used to fetch LPAR data when running on an iSeries platform.
 */
static int iseries_lparcfg_data(struct seq_file *m, void *v)
{
      unsigned long pool_id;
      int shared, entitled_capacity, max_entitled_capacity;
      int processors, max_processors;
      unsigned long purr = get_purr();

      shared = (int)(local_paca->lppaca_ptr->shared_proc);

      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;
}

#else                   /* CONFIG_PPC_ISERIES */

static int iseries_lparcfg_data(struct seq_file *m, void *v)
{
      return 0;
}

#endif                        /* CONFIG_PPC_ISERIES */

#ifdef CONFIG_PPC_PSERIES
/*
 * Methods used to fetch LPAR data when running on a pSeries platform.
 */
static void log_plpar_hcall_return(unsigned long rc, char *tag)
{
      switch(rc) {
      case 0:
            return;
      case H_HARDWARE:
            printk(KERN_INFO "plpar-hcall (%s) "
                        "Hardware fault\n", tag);
            return;
      case H_FUNCTION:
            printk(KERN_INFO "plpar-hcall (%s) "
                        "Function not allowed\n", tag);
            return;
      case H_AUTHORITY:
            printk(KERN_INFO "plpar-hcall (%s) "
                        "Not authorized to this function\n", tag);
            return;
      case H_PARAMETER:
            printk(KERN_INFO "plpar-hcall (%s) "
                        "Bad parameter(s)\n",tag);
            return;
      default:
            printk(KERN_INFO "plpar-hcall (%s) "
                        "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;
      unsigned long retbuf[PLPAR_HCALL_BUFSIZE];

      rc = plpar_hcall(H_GET_PPP, retbuf);

      *entitled = retbuf[0];
      *unallocated = retbuf[1];
      *aggregation = retbuf[2];
      *resource = retbuf[3];

      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 retbuf[PLPAR_HCALL_BUFSIZE];

      rc = plpar_hcall(H_PIC, retbuf);

      *pool_idle_time = retbuf[0];
      *num_procs = retbuf[1];

      if (rc != H_AUTHORITY)
            log_plpar_hcall_return(rc, "H_PIC");
}

#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;

      unsigned 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),
                        RTAS_DATA_BUF_SIZE);
      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 = kzalloc(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] * 256 + local_buffer[1];
            local_buffer += 2;      /* step over strlen value */

            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 pseries_lparcfg_data(struct seq_file *m, void *v)
{
      int partition_potential_processors;
      int partition_active_processors;
      struct device_node *rtas_node;
      const int *lrdrp = NULL;

      rtas_node = of_find_node_by_path("/rtas");
      if (rtas_node)
            lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);

      if (lrdrp == NULL) {
            partition_potential_processors = vdso_data->processorCount;
      } else {
            partition_potential_processors = *(lrdrp + 4);
      }
      of_node_put(rtas_node);

      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 (lppaca[0].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", lppaca[0].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;

      if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
                  firmware_has_feature(FW_FEATURE_ISERIES))
            return -EINVAL;

      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 = %u\n",
             __FUNCTION__, current_entitled, current_weight);

      pr_debug("%s: new_entitled = %lu, new_weight = %u\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;
}

#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");

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