lparcfg.c

linux-2.6.15.6

				}
				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 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 = vdso_data->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");