lparcfg.c

linux 内核源代码

/*
 * PowerPC64 LPAR Configuration Information Driver
 *
 * Dave Engebretsen [e-mail]
 *    Copyright (c) 2003 Dave Engebretsen
 * Will Schmidt [e-mail]
 *    SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
 *    seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
 * Nathan Lynch [e-mail]
 *    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;