hypfs_vm_fs.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 *    Hypervisor filesystem for Linux on s390. z/VM implementation.
  4 *
  5 *    Copyright IBM Corp. 2006
  6 *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
  7 */
  8
  9#include <linux/types.h>
 10#include <linux/errno.h>
 11#include <linux/string.h>
 12#include <linux/vmalloc.h>
 13#include <asm/extable.h>
 14#include <asm/diag.h>
 15#include <asm/ebcdic.h>
 16#include <asm/timex.h>
 17#include "hypfs_vm.h"
 18#include "hypfs.h"
 19
 20#define ATTRIBUTE(dir, name, member) \
 21do { \
 22	int rc = hypfs_create_u64(dir, name, member); \
 23	if (rc) \
 24		return rc; \
 25} while (0)
 26
 27static int hypfs_vm_create_guest(struct dentry *systems_dir,
 28				 struct diag2fc_data *data)
 29{
 30	char guest_name[DIAG2FC_NAME_LEN + 1] = {};
 31	struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
 32	int dedicated_flag, capped_value;
 33
 34	capped_value = (data->flags & 0x00000006) >> 1;
 35	dedicated_flag = (data->flags & 0x00000008) >> 3;
 36
 37	/* guest dir */
 38	memcpy(guest_name, data->guest_name, DIAG2FC_NAME_LEN);
 39	EBCASC(guest_name, DIAG2FC_NAME_LEN);
 40	strim(guest_name);
 41	guest_dir = hypfs_mkdir(systems_dir, guest_name);
 42	if (IS_ERR(guest_dir))
 43		return PTR_ERR(guest_dir);
 44	ATTRIBUTE(guest_dir, "onlinetime_us", data->el_time);
 45
 46	/* logical cpu information */
 47	cpus_dir = hypfs_mkdir(guest_dir, "cpus");
 48	if (IS_ERR(cpus_dir))
 49		return PTR_ERR(cpus_dir);
 50	ATTRIBUTE(cpus_dir, "cputime_us", data->used_cpu);
 51	ATTRIBUTE(cpus_dir, "capped", capped_value);
 52	ATTRIBUTE(cpus_dir, "dedicated", dedicated_flag);
 53	ATTRIBUTE(cpus_dir, "count", data->vcpus);
 54	/*
 55	 * Note: The "weight_min" attribute got the wrong name.
 56	 * The value represents the number of non-stopped (operating)
 57	 * CPUS.
 58	 */
 59	ATTRIBUTE(cpus_dir, "weight_min", data->ocpus);
 60	ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max);
 61	ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares);
 62
 63	/* memory information */
 64	mem_dir = hypfs_mkdir(guest_dir, "mem");
 65	if (IS_ERR(mem_dir))
 66		return PTR_ERR(mem_dir);
 67	ATTRIBUTE(mem_dir, "min_KiB", data->mem_min_kb);
 68	ATTRIBUTE(mem_dir, "max_KiB", data->mem_max_kb);
 69	ATTRIBUTE(mem_dir, "used_KiB", data->mem_used_kb);
 70	ATTRIBUTE(mem_dir, "share_KiB", data->mem_share_kb);
 71
 72	/* samples */
 73	samples_dir = hypfs_mkdir(guest_dir, "samples");
 74	if (IS_ERR(samples_dir))
 75		return PTR_ERR(samples_dir);
 76	ATTRIBUTE(samples_dir, "cpu_using", data->cpu_use_samp);
 77	ATTRIBUTE(samples_dir, "cpu_delay", data->cpu_delay_samp);
 78	ATTRIBUTE(samples_dir, "mem_delay", data->page_wait_samp);
 79	ATTRIBUTE(samples_dir, "idle", data->idle_samp);
 80	ATTRIBUTE(samples_dir, "other", data->other_samp);
 81	ATTRIBUTE(samples_dir, "total", data->total_samp);
 82	return 0;
 83}
 84
 85int hypfs_vm_create_files(struct dentry *root)
 86{
 87	struct dentry *dir;
 88	struct diag2fc_data *data;
 89	unsigned int count = 0;
 90	int rc, i;
 91
 92	data = diag2fc_store(diag2fc_guest_query, &count, 0);
 93	if (IS_ERR(data))
 94		return PTR_ERR(data);
 95
 96	/* Hypervisor Info */
 97	dir = hypfs_mkdir(root, "hyp");
 98	if (IS_ERR(dir)) {
 99		rc = PTR_ERR(dir);
100		goto failed;
101	}
102	rc = hypfs_create_str(dir, "type", "z/VM Hypervisor");
103	if (rc)
104		goto failed;
105
106	/* physical cpus */
107	dir = hypfs_mkdir(root, "cpus");
108	if (IS_ERR(dir)) {
109		rc = PTR_ERR(dir);
110		goto failed;
111	}
112	rc = hypfs_create_u64(dir, "count", data->lcpus);
113	if (rc)
114		goto failed;
115
116	/* guests */
117	dir = hypfs_mkdir(root, "systems");
118	if (IS_ERR(dir)) {
119		rc = PTR_ERR(dir);
120		goto failed;
121	}
122
123	for (i = 0; i < count; i++) {
124		rc = hypfs_vm_create_guest(dir, &data[i]);
125		if (rc)
126			goto failed;
127	}
128	diag2fc_free(data);
129	return 0;
130
131failed:
132	diag2fc_free(data);
133	return rc;
134}