/*
   * 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 <linux/slab.h>
  #include <asm/uaccess.h>
  #include <asm/lppaca.h>
  #include <asm/hvcall.h>
  #include <asm/firmware.h>
  #include <asm/rtas.h>
  #include <asm/time.h>
  #include <asm/prom.h>
  #include <asm/vdso_datapage.h>
  #include <asm/vio.h>
  #include <asm/mmu.h>
  #include <asm/machdep.h>
  
  
  /*
   * This isn't a module but we expose that to userspace
   * via /proc so leave the definitions here
   */
  #define MODULE_VERS "1.9"
  #define MODULE_NAME "lparcfg"
  
  /* #define LPARCFG_DEBUG */
  
  /*
   * 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) {
  		struct cpu_usage *cu;
  
  		cu = &per_cpu(cpu_usage_array, cpu);
  		sum_purr += cu->current_tb;
  	}
  	return sum_purr;
  }
  
  /*
   * Methods used to fetch LPAR data when running on a pSeries platform.
   */
  
  struct hvcall_ppp_data {
  	u64	entitlement;
  	u64	unallocated_entitlement;
  	u16	group_num;
  	u16	pool_num;
  	u8	capped;
  	u8	weight;
  	u8	unallocated_weight;
  	u16	active_procs_in_pool;
  	u16	active_system_procs;
  	u16	phys_platform_procs;
  	u32	max_proc_cap_avail;
  	u32	entitled_proc_cap_avail;
  };
  
  /*
   * 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.
   *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
   *	XXXX - Physical platform procs allocated to virtualization.
   *	    XXXXXX - Max procs capacity % available to the partitions pool.
   *	          XXXXXX - Entitled procs capacity % available to the
   *			   partitions pool.
   */
  static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
  {
  	unsigned long rc;
  	unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
  
  	rc = plpar_hcall9(H_GET_PPP, retbuf);
  
  	ppp_data->entitlement = retbuf[0];
  	ppp_data->unallocated_entitlement = retbuf[1];
  
  	ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
  	ppp_data->pool_num = retbuf[2] & 0xffff;
  
  	ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
  	ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
  	ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
  	ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
  	ppp_data->active_system_procs = retbuf[3] & 0xffff;
  
  	ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
  	ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
  	ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
  
  	return rc;
  }
  
  static unsigned 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];
  
  	return rc;
  }
  
  /*
   * parse_ppp_data
   * Parse out the data returned from h_get_ppp and h_pic
   */
  static void parse_ppp_data(struct seq_file *m)
  {
  	struct hvcall_ppp_data ppp_data;
  	struct device_node *root;
  	const __be32 *perf_level;
  	int rc;
  
  	rc = h_get_ppp(&ppp_data);
  	if (rc)
  		return;
  
  	seq_printf(m, "partition_entitled_capacity=%lld
  ",
  	           ppp_data.entitlement);
  	seq_printf(m, "group=%d
  ", ppp_data.group_num);
  	seq_printf(m, "system_active_processors=%d
  ",
  	           ppp_data.active_system_procs);
  
  	/* pool related entries are appropriate for shared configs */
  	if (lppaca_shared_proc(get_lppaca())) {
  		unsigned long pool_idle_time, pool_procs;
  
  		seq_printf(m, "pool=%d
  ", ppp_data.pool_num);
  
  		/* report pool_capacity in percentage */
  		seq_printf(m, "pool_capacity=%d
  ",
  			   ppp_data.active_procs_in_pool * 100);
  
  		h_pic(&pool_idle_time, &pool_procs);
  		seq_printf(m, "pool_idle_time=%ld
  ", pool_idle_time);
  		seq_printf(m, "pool_num_procs=%ld
  ", pool_procs);
  	}
  
  	seq_printf(m, "unallocated_capacity_weight=%d
  ",
  		   ppp_data.unallocated_weight);
  	seq_printf(m, "capacity_weight=%d
  ", ppp_data.weight);
  	seq_printf(m, "capped=%d
  ", ppp_data.capped);
  	seq_printf(m, "unallocated_capacity=%lld
  ",
  		   ppp_data.unallocated_entitlement);
  
  	/* The last bits of information returned from h_get_ppp are only
  	 * valid if the ibm,partition-performance-parameters-level
  	 * property is >= 1.
  	 */
  	root = of_find_node_by_path("/");
  	if (root) {
  		perf_level = of_get_property(root,
  				"ibm,partition-performance-parameters-level",
  					     NULL);
  		if (perf_level && (be32_to_cpup(perf_level) >= 1)) {
  			seq_printf(m,
  			    "physical_procs_allocated_to_virtualization=%d
  ",
  				   ppp_data.phys_platform_procs);
  			seq_printf(m, "max_proc_capacity_available=%d
  ",
  				   ppp_data.max_proc_cap_avail);
  			seq_printf(m, "entitled_proc_capacity_available=%d
  ",
  				   ppp_data.entitled_proc_cap_avail);
  		}
  
  		of_node_put(root);
  	}
  }
  
  /**
   * parse_mpp_data
   * Parse out data returned from h_get_mpp
   */
  static void parse_mpp_data(struct seq_file *m)
  {
  	struct hvcall_mpp_data mpp_data;
  	int rc;
  
  	rc = h_get_mpp(&mpp_data);
  	if (rc)
  		return;
  
  	seq_printf(m, "entitled_memory=%ld
  ", mpp_data.entitled_mem);
  
  	if (mpp_data.mapped_mem != -1)
  		seq_printf(m, "mapped_entitled_memory=%ld
  ",
  		           mpp_data.mapped_mem);
  
  	seq_printf(m, "entitled_memory_group_number=%d
  ", mpp_data.group_num);
  	seq_printf(m, "entitled_memory_pool_number=%d
  ", mpp_data.pool_num);
  
  	seq_printf(m, "entitled_memory_weight=%d
  ", mpp_data.mem_weight);
  	seq_printf(m, "unallocated_entitled_memory_weight=%d
  ",
  	           mpp_data.unallocated_mem_weight);
  	seq_printf(m, "unallocated_io_mapping_entitlement=%ld
  ",
  	           mpp_data.unallocated_entitlement);
  
  	if (mpp_data.pool_size != -1)
  		seq_printf(m, "entitled_memory_pool_size=%ld bytes
  ",
  		           mpp_data.pool_size);
  
  	seq_printf(m, "entitled_memory_loan_request=%ld
  ",
  	           mpp_data.loan_request);
  
  	seq_printf(m, "backing_memory=%ld bytes
  ", mpp_data.backing_mem);
  }
  
  /**
   * parse_mpp_x_data
   * Parse out data returned from h_get_mpp_x
   */
  static void parse_mpp_x_data(struct seq_file *m)
  {
  	struct hvcall_mpp_x_data mpp_x_data;
  
  	if (!firmware_has_feature(FW_FEATURE_XCMO))
  		return;
  	if (h_get_mpp_x(&mpp_x_data))
  		return;
  
  	seq_printf(m, "coalesced_bytes=%ld
  ", mpp_x_data.coalesced_bytes);
  
  	if (mpp_x_data.pool_coalesced_bytes)
  		seq_printf(m, "pool_coalesced_bytes=%ld
  ",
  			   mpp_x_data.pool_coalesced_bytes);
  	if (mpp_x_data.pool_purr_cycles)
  		seq_printf(m, "coalesce_pool_purr=%ld
  ", mpp_x_data.pool_purr_cycles);
  	if (mpp_x_data.pool_spurr_cycles)
  		seq_printf(m, "coalesce_pool_spurr=%ld
  ", mpp_x_data.pool_spurr_cycles);
  }
  
  #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
  ",
  		       __FILE__, __func__, __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);
  	local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
  	spin_unlock(&rtas_data_buf_lock);
  
  	if (call_status != 0) {
  		printk(KERN_INFO
  		       "%s %s Error calling get-system-parameter (0x%x)
  ",
  		       __FILE__, __func__, 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
  ",
  			       __FILE__, __func__, __LINE__);
  			kfree(local_buffer);
  			return;
  		}
  #ifdef LPARCFG_DEBUG
  		printk(KERN_INFO "success calling get-system-parameter
  ");
  #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
  ", 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
  ", cpus_dn);
  #endif
  		count++;
  	}
  	return count;
  }
  
  static void pseries_cmo_data(struct seq_file *m)
  {
  	int cpu;
  	unsigned long cmo_faults = 0;
  	unsigned long cmo_fault_time = 0;
  
  	seq_printf(m, "cmo_enabled=%d
  ", firmware_has_feature(FW_FEATURE_CMO));
  
  	if (!firmware_has_feature(FW_FEATURE_CMO))
  		return;
  
  	for_each_possible_cpu(cpu) {
  		cmo_faults += be64_to_cpu(lppaca_of(cpu).cmo_faults);
  		cmo_fault_time += be64_to_cpu(lppaca_of(cpu).cmo_fault_time);
  	}
  
  	seq_printf(m, "cmo_faults=%lu
  ", cmo_faults);
  	seq_printf(m, "cmo_fault_time_usec=%lu
  ",
  		   cmo_fault_time / tb_ticks_per_usec);
  	seq_printf(m, "cmo_primary_psp=%d
  ", cmo_get_primary_psp());
  	seq_printf(m, "cmo_secondary_psp=%d
  ", cmo_get_secondary_psp());
  	seq_printf(m, "cmo_page_size=%lu
  ", cmo_get_page_size());
  }
  
  static void splpar_dispatch_data(struct seq_file *m)
  {
  	int cpu;
  	unsigned long dispatches = 0;
  	unsigned long dispatch_dispersions = 0;
  
  	for_each_possible_cpu(cpu) {
  		dispatches += be32_to_cpu(lppaca_of(cpu).yield_count);
  		dispatch_dispersions +=
  			be32_to_cpu(lppaca_of(cpu).dispersion_count);
  	}
  
  	seq_printf(m, "dispatches=%lu
  ", dispatches);
  	seq_printf(m, "dispatch_dispersions=%lu
  ", dispatch_dispersions);
  }
  
  static void parse_em_data(struct seq_file *m)
  {
  	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
  
  	if (firmware_has_feature(FW_FEATURE_LPAR) &&
  	    plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
  		seq_printf(m, "power_mode_data=%016lx
  ", retbuf[0]);
  }
  
  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 __be32 *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 = be32_to_cpup(lrdrp + 4);
  	}
  	of_node_put(rtas_node);
  
  	partition_active_processors = lparcfg_count_active_processors();
  
  	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
  		/* this call handles the ibm,get-system-parameter contents */
  		parse_system_parameter_string(m);
  		parse_ppp_data(m);
  		parse_mpp_data(m);
  		parse_mpp_x_data(m);
  		pseries_cmo_data(m);
  		splpar_dispatch_data(m);
  
  		seq_printf(m, "purr=%ld
  ", get_purr());
  	} else {		/* non SPLPAR case */
  
  		seq_printf(m, "system_active_processors=%d
  ",
  			   partition_potential_processors);
  
  		seq_printf(m, "system_potential_processors=%d
  ",
  			   partition_potential_processors);
  
  		seq_printf(m, "partition_max_entitled_capacity=%d
  ",
  			   partition_potential_processors * 100);
  
  		seq_printf(m, "partition_entitled_capacity=%d
  ",
  			   partition_active_processors * 100);
  	}
  
  	seq_printf(m, "partition_active_processors=%d
  ",
  		   partition_active_processors);
  
  	seq_printf(m, "partition_potential_processors=%d
  ",
  		   partition_potential_processors);
  
  	seq_printf(m, "shared_processor_mode=%d
  ",
  		   lppaca_shared_proc(get_lppaca()));
  
  	seq_printf(m, "slb_size=%d
  ", mmu_slb_size);
  
  	parse_em_data(m);
  
  	return 0;
  }
  
  static ssize_t update_ppp(u64 *entitlement, u8 *weight)
  {
  	struct hvcall_ppp_data ppp_data;
  	u8 new_weight;
  	u64 new_entitled;
  	ssize_t retval;
  
  	/* Get our current parameters */
  	retval = h_get_ppp(&ppp_data);
  	if (retval)
  		return retval;
  
  	if (entitlement) {
  		new_weight = ppp_data.weight;
  		new_entitled = *entitlement;
  	} else if (weight) {
  		new_weight = *weight;
  		new_entitled = ppp_data.entitlement;
  	} else
  		return -EINVAL;
  
  	pr_debug("%s: current_entitled = %llu, current_weight = %u
  ",
  		 __func__, ppp_data.entitlement, ppp_data.weight);
  
  	pr_debug("%s: new_entitled = %llu, new_weight = %u
  ",
  		 __func__, new_entitled, new_weight);
  
  	retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
  	return retval;
  }
  
  /**
   * update_mpp
   *
   * Update the memory entitlement and weight for the partition.  Caller must
   * specify either a new entitlement or weight, not both, to be updated
   * since the h_set_mpp call takes both entitlement and weight as parameters.
   */
  static ssize_t update_mpp(u64 *entitlement, u8 *weight)
  {
  	struct hvcall_mpp_data mpp_data;
  	u64 new_entitled;
  	u8 new_weight;
  	ssize_t rc;
  
  	if (entitlement) {
  		/* Check with vio to ensure the new memory entitlement
  		 * can be handled.
  		 */
  		rc = vio_cmo_entitlement_update(*entitlement);
  		if (rc)
  			return rc;
  	}
  
  	rc = h_get_mpp(&mpp_data);
  	if (rc)
  		return rc;
  
  	if (entitlement) {
  		new_weight = mpp_data.mem_weight;
  		new_entitled = *entitlement;
  	} else if (weight) {
  		new_weight = *weight;
  		new_entitled = mpp_data.entitled_mem;
  	} else
  		return -EINVAL;
  
  	pr_debug("%s: current_entitled = %lu, current_weight = %u
  ",
  	         __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
  
  	pr_debug("%s: new_entitled = %llu, new_weight = %u
  ",
  		 __func__, new_entitled, new_weight);
  
  	rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
  	return rc;
  }
  
  /*
   * 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)
  {
  	int kbuf_sz = 64;
  	char kbuf[kbuf_sz];
  	char *tmp;
  	u64 new_entitled, *new_entitled_ptr = &new_entitled;
  	u8 new_weight, *new_weight_ptr = &new_weight;
  	ssize_t retval;
  
  	if (!firmware_has_feature(FW_FEATURE_SPLPAR))
  		return -EINVAL;
  
  	if (count > kbuf_sz)
  		return -EINVAL;
  
  	if (copy_from_user(kbuf, buf, count))
  		return -EFAULT;
  
  	kbuf[count - 1] = '\0';
  	tmp = strchr(kbuf, '=');
  	if (!tmp)
  		return -EINVAL;
  
  	*tmp++ = '\0';
  
  	if (!strcmp(kbuf, "partition_entitled_capacity")) {
  		char *endp;
  		*new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
  		if (endp == tmp)
  			return -EINVAL;
  
  		retval = update_ppp(new_entitled_ptr, NULL);
  	} else if (!strcmp(kbuf, "capacity_weight")) {
  		char *endp;
  		*new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
  		if (endp == tmp)
  			return -EINVAL;
  
  		retval = update_ppp(NULL, new_weight_ptr);
  	} else if (!strcmp(kbuf, "entitled_memory")) {
  		char *endp;
  		*new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
  		if (endp == tmp)
  			return -EINVAL;
  
  		retval = update_mpp(new_entitled_ptr, NULL);
  	} else if (!strcmp(kbuf, "entitled_memory_weight")) {
  		char *endp;
  		*new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
  		if (endp == tmp)
  			return -EINVAL;
  
  		retval = update_mpp(NULL, new_weight_ptr);
  	} else
  		return -EINVAL;
  
  	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;
  	}
  
  	return retval;
  }
  
  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 __be32 *lp_index_ptr;
  	unsigned int lp_index = 0;
  
  	seq_printf(m, "%s %s
  ", MODULE_NAME, MODULE_VERS);
  
  	rootdn = of_find_node_by_path("/");
  	if (rootdn) {
  		tmp = of_get_property(rootdn, "model", NULL);
  		if (tmp)
  			model = tmp;
  		tmp = of_get_property(rootdn, "system-id", NULL);
  		if (tmp)
  			system_id = tmp;
  		lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
  					NULL);
  		if (lp_index_ptr)
  			lp_index = be32_to_cpup(lp_index_ptr);
  		of_node_put(rootdn);
  	}
  	seq_printf(m, "serial_number=%s
  ", system_id);
  	seq_printf(m, "system_type=%s
  ", model);
  	seq_printf(m, "partition_id=%d
  ", (int)lp_index);
  
  	return pseries_lparcfg_data(m, v);
  }
  
  static int lparcfg_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, lparcfg_data, NULL);
  }
  
  static const struct file_operations lparcfg_fops = {
  	.read		= seq_read,
  	.write		= lparcfg_write,
  	.open		= lparcfg_open,
  	.release	= single_release,
  	.llseek		= seq_lseek,
  };
  
  static int __init lparcfg_init(void)
  {
  	umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
  
  	/* Allow writing if we have FW_FEATURE_SPLPAR */
  	if (firmware_has_feature(FW_FEATURE_SPLPAR))
  		mode |= S_IWUSR;
  
  	if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops)) {
  		printk(KERN_ERR "Failed to create powerpc/lparcfg
  ");
  		return -EIO;
  	}
  	return 0;
  }
  machine_device_initcall(pseries, lparcfg_init);