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	void *rc; \
 23	rc = hypfs_create_u64(dir, name, member); \
 24	if (IS_ERR(rc)) \
 25		return PTR_ERR(rc); \
 26} while (0)
 27
 28static int hypfs_vm_create_guest(struct dentry *systems_dir,
 29				 struct diag2fc_data *data)
 30{
 31	char guest_name[DIAG2FC_NAME_LEN + 1] = {};
 32	struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
 33	int dedicated_flag, capped_value;
 34
 35	capped_value = (data->flags & 0x00000006) >> 1;
 36	dedicated_flag = (data->flags & 0x00000008) >> 3;
 37
 38	/* guest dir */
 39	memcpy(guest_name, data->guest_name, DIAG2FC_NAME_LEN);
 40	EBCASC(guest_name, DIAG2FC_NAME_LEN);
 41	strim(guest_name);
 42	guest_dir = hypfs_mkdir(systems_dir, guest_name);
 43	if (IS_ERR(guest_dir))
 44		return PTR_ERR(guest_dir);
 45	ATTRIBUTE(guest_dir, "onlinetime_us", data->el_time);
 46
 47	/* logical cpu information */
 48	cpus_dir = hypfs_mkdir(guest_dir, "cpus");
 49	if (IS_ERR(cpus_dir))
 50		return PTR_ERR(cpus_dir);
 51	ATTRIBUTE(cpus_dir, "cputime_us", data->used_cpu);
 52	ATTRIBUTE(cpus_dir, "capped", capped_value);
 53	ATTRIBUTE(cpus_dir, "dedicated", dedicated_flag);
 54	ATTRIBUTE(cpus_dir, "count", data->vcpus);
 55	/*
 56	 * Note: The "weight_min" attribute got the wrong name.
 57	 * The value represents the number of non-stopped (operating)
 58	 * CPUS.
 59	 */
 60	ATTRIBUTE(cpus_dir, "weight_min", data->ocpus);
 61	ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max);
 62	ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares);
 63
 64	/* memory information */
 65	mem_dir = hypfs_mkdir(guest_dir, "mem");
 66	if (IS_ERR(mem_dir))
 67		return PTR_ERR(mem_dir);
 68	ATTRIBUTE(mem_dir, "min_KiB", data->mem_min_kb);
 69	ATTRIBUTE(mem_dir, "max_KiB", data->mem_max_kb);
 70	ATTRIBUTE(mem_dir, "used_KiB", data->mem_used_kb);
 71	ATTRIBUTE(mem_dir, "share_KiB", data->mem_share_kb);
 72
 73	/* samples */
 74	samples_dir = hypfs_mkdir(guest_dir, "samples");
 75	if (IS_ERR(samples_dir))
 76		return PTR_ERR(samples_dir);
 77	ATTRIBUTE(samples_dir, "cpu_using", data->cpu_use_samp);
 78	ATTRIBUTE(samples_dir, "cpu_delay", data->cpu_delay_samp);
 79	ATTRIBUTE(samples_dir, "mem_delay", data->page_wait_samp);
 80	ATTRIBUTE(samples_dir, "idle", data->idle_samp);
 81	ATTRIBUTE(samples_dir, "other", data->other_samp);
 82	ATTRIBUTE(samples_dir, "total", data->total_samp);
 83	return 0;
 84}
 85
 86int hypfs_vm_create_files(struct dentry *root)
 87{
 88	struct dentry *dir, *file;
 89	struct diag2fc_data *data;
 90	unsigned int count = 0;
 91	int rc, i;
 92
 93	data = diag2fc_store(diag2fc_guest_query, &count, 0);
 94	if (IS_ERR(data))
 95		return PTR_ERR(data);
 96
 97	/* Hypervisor Info */
 98	dir = hypfs_mkdir(root, "hyp");
 99	if (IS_ERR(dir)) {
100		rc = PTR_ERR(dir);
101		goto failed;
102	}
103	file = hypfs_create_str(dir, "type", "z/VM Hypervisor");
104	if (IS_ERR(file)) {
105		rc = PTR_ERR(file);
106		goto failed;
107	}
108
109	/* physical cpus */
110	dir = hypfs_mkdir(root, "cpus");
111	if (IS_ERR(dir)) {
112		rc = PTR_ERR(dir);
113		goto failed;
114	}
115	file = hypfs_create_u64(dir, "count", data->lcpus);
116	if (IS_ERR(file)) {
117		rc = PTR_ERR(file);
118		goto failed;
119	}
120
121	/* guests */
122	dir = hypfs_mkdir(root, "systems");
123	if (IS_ERR(dir)) {
124		rc = PTR_ERR(dir);
125		goto failed;
126	}
127
128	for (i = 0; i < count; i++) {
129		rc = hypfs_vm_create_guest(dir, &data[i]);
130		if (rc)
131			goto failed;
132	}
133	diag2fc_free(data);
134	return 0;
135
136failed:
137	diag2fc_free(data);
138	return rc;
139}