292 lines
6.7 KiB
C
292 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Hypervisor filesystem for Linux on s390. z/VM implementation.
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*
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* Copyright IBM Corp. 2006
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* Author(s): Michael Holzheu <holzheu@de.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/vmalloc.h>
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#include <asm/diag.h>
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#include <asm/ebcdic.h>
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#include <asm/timex.h>
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#include "hypfs.h"
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#define NAME_LEN 8
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#define DBFS_D2FC_HDR_VERSION 0
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static char local_guest[] = " ";
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static char all_guests[] = "* ";
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static char *guest_query;
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struct diag2fc_data {
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__u32 version;
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__u32 flags;
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__u64 used_cpu;
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__u64 el_time;
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__u64 mem_min_kb;
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__u64 mem_max_kb;
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__u64 mem_share_kb;
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__u64 mem_used_kb;
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__u32 pcpus;
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__u32 lcpus;
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__u32 vcpus;
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__u32 ocpus;
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__u32 cpu_max;
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__u32 cpu_shares;
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__u32 cpu_use_samp;
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__u32 cpu_delay_samp;
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__u32 page_wait_samp;
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__u32 idle_samp;
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__u32 other_samp;
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__u32 total_samp;
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char guest_name[NAME_LEN];
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};
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struct diag2fc_parm_list {
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char userid[NAME_LEN];
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char aci_grp[NAME_LEN];
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__u64 addr;
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__u32 size;
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__u32 fmt;
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};
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static int diag2fc(int size, char* query, void *addr)
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{
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unsigned long residual_cnt;
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unsigned long rc;
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struct diag2fc_parm_list parm_list;
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memcpy(parm_list.userid, query, NAME_LEN);
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ASCEBC(parm_list.userid, NAME_LEN);
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parm_list.addr = (unsigned long) addr ;
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parm_list.size = size;
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parm_list.fmt = 0x02;
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memset(parm_list.aci_grp, 0x40, NAME_LEN);
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rc = -1;
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diag_stat_inc(DIAG_STAT_X2FC);
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asm volatile(
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" diag %0,%1,0x2fc\n"
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"0: nopr %%r7\n"
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EX_TABLE(0b,0b)
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: "=d" (residual_cnt), "+d" (rc) : "0" (&parm_list) : "memory");
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if ((rc != 0 ) && (rc != -2))
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return rc;
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else
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return -residual_cnt;
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}
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/*
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* Allocate buffer for "query" and store diag 2fc at "offset"
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*/
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static void *diag2fc_store(char *query, unsigned int *count, int offset)
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{
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void *data;
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int size;
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do {
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size = diag2fc(0, query, NULL);
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if (size < 0)
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return ERR_PTR(-EACCES);
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data = vmalloc(size + offset);
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if (!data)
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return ERR_PTR(-ENOMEM);
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if (diag2fc(size, query, data + offset) == 0)
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break;
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vfree(data);
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} while (1);
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*count = (size / sizeof(struct diag2fc_data));
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return data;
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}
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static void diag2fc_free(const void *data)
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{
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vfree(data);
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}
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#define ATTRIBUTE(dir, name, member) \
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do { \
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void *rc; \
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rc = hypfs_create_u64(dir, name, member); \
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if (IS_ERR(rc)) \
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return PTR_ERR(rc); \
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} while(0)
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static int hypfs_vm_create_guest(struct dentry *systems_dir,
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struct diag2fc_data *data)
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{
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char guest_name[NAME_LEN + 1] = {};
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struct dentry *guest_dir, *cpus_dir, *samples_dir, *mem_dir;
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int dedicated_flag, capped_value;
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capped_value = (data->flags & 0x00000006) >> 1;
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dedicated_flag = (data->flags & 0x00000008) >> 3;
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/* guest dir */
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memcpy(guest_name, data->guest_name, NAME_LEN);
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EBCASC(guest_name, NAME_LEN);
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strim(guest_name);
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guest_dir = hypfs_mkdir(systems_dir, guest_name);
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if (IS_ERR(guest_dir))
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return PTR_ERR(guest_dir);
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ATTRIBUTE(guest_dir, "onlinetime_us", data->el_time);
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/* logical cpu information */
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cpus_dir = hypfs_mkdir(guest_dir, "cpus");
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if (IS_ERR(cpus_dir))
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return PTR_ERR(cpus_dir);
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ATTRIBUTE(cpus_dir, "cputime_us", data->used_cpu);
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ATTRIBUTE(cpus_dir, "capped", capped_value);
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ATTRIBUTE(cpus_dir, "dedicated", dedicated_flag);
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ATTRIBUTE(cpus_dir, "count", data->vcpus);
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/*
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* Note: The "weight_min" attribute got the wrong name.
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* The value represents the number of non-stopped (operating)
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* CPUS.
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*/
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ATTRIBUTE(cpus_dir, "weight_min", data->ocpus);
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ATTRIBUTE(cpus_dir, "weight_max", data->cpu_max);
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ATTRIBUTE(cpus_dir, "weight_cur", data->cpu_shares);
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/* memory information */
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mem_dir = hypfs_mkdir(guest_dir, "mem");
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if (IS_ERR(mem_dir))
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return PTR_ERR(mem_dir);
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ATTRIBUTE(mem_dir, "min_KiB", data->mem_min_kb);
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ATTRIBUTE(mem_dir, "max_KiB", data->mem_max_kb);
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ATTRIBUTE(mem_dir, "used_KiB", data->mem_used_kb);
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ATTRIBUTE(mem_dir, "share_KiB", data->mem_share_kb);
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/* samples */
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samples_dir = hypfs_mkdir(guest_dir, "samples");
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if (IS_ERR(samples_dir))
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return PTR_ERR(samples_dir);
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ATTRIBUTE(samples_dir, "cpu_using", data->cpu_use_samp);
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ATTRIBUTE(samples_dir, "cpu_delay", data->cpu_delay_samp);
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ATTRIBUTE(samples_dir, "mem_delay", data->page_wait_samp);
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ATTRIBUTE(samples_dir, "idle", data->idle_samp);
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ATTRIBUTE(samples_dir, "other", data->other_samp);
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ATTRIBUTE(samples_dir, "total", data->total_samp);
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return 0;
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}
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int hypfs_vm_create_files(struct dentry *root)
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{
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struct dentry *dir, *file;
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struct diag2fc_data *data;
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unsigned int count = 0;
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int rc, i;
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data = diag2fc_store(guest_query, &count, 0);
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if (IS_ERR(data))
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return PTR_ERR(data);
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/* Hpervisor Info */
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dir = hypfs_mkdir(root, "hyp");
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if (IS_ERR(dir)) {
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rc = PTR_ERR(dir);
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goto failed;
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}
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file = hypfs_create_str(dir, "type", "z/VM Hypervisor");
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if (IS_ERR(file)) {
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rc = PTR_ERR(file);
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goto failed;
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}
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/* physical cpus */
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dir = hypfs_mkdir(root, "cpus");
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if (IS_ERR(dir)) {
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rc = PTR_ERR(dir);
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goto failed;
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}
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file = hypfs_create_u64(dir, "count", data->lcpus);
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if (IS_ERR(file)) {
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rc = PTR_ERR(file);
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goto failed;
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}
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/* guests */
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dir = hypfs_mkdir(root, "systems");
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if (IS_ERR(dir)) {
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rc = PTR_ERR(dir);
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goto failed;
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}
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for (i = 0; i < count; i++) {
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rc = hypfs_vm_create_guest(dir, &(data[i]));
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if (rc)
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goto failed;
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}
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diag2fc_free(data);
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return 0;
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failed:
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diag2fc_free(data);
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return rc;
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}
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struct dbfs_d2fc_hdr {
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u64 len; /* Length of d2fc buffer without header */
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u16 version; /* Version of header */
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char tod_ext[STORE_CLOCK_EXT_SIZE]; /* TOD clock for d2fc */
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u64 count; /* Number of VM guests in d2fc buffer */
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char reserved[30];
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} __attribute__ ((packed));
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struct dbfs_d2fc {
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struct dbfs_d2fc_hdr hdr; /* 64 byte header */
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char buf[]; /* d2fc buffer */
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} __attribute__ ((packed));
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static int dbfs_diag2fc_create(void **data, void **data_free_ptr, size_t *size)
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{
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struct dbfs_d2fc *d2fc;
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unsigned int count;
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d2fc = diag2fc_store(guest_query, &count, sizeof(d2fc->hdr));
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if (IS_ERR(d2fc))
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return PTR_ERR(d2fc);
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get_tod_clock_ext(d2fc->hdr.tod_ext);
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d2fc->hdr.len = count * sizeof(struct diag2fc_data);
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d2fc->hdr.version = DBFS_D2FC_HDR_VERSION;
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d2fc->hdr.count = count;
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memset(&d2fc->hdr.reserved, 0, sizeof(d2fc->hdr.reserved));
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*data = d2fc;
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*data_free_ptr = d2fc;
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*size = d2fc->hdr.len + sizeof(struct dbfs_d2fc_hdr);
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return 0;
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}
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static struct hypfs_dbfs_file dbfs_file_2fc = {
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.name = "diag_2fc",
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.data_create = dbfs_diag2fc_create,
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.data_free = diag2fc_free,
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};
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int hypfs_vm_init(void)
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{
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if (!MACHINE_IS_VM)
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return 0;
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if (diag2fc(0, all_guests, NULL) > 0)
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guest_query = all_guests;
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else if (diag2fc(0, local_guest, NULL) > 0)
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guest_query = local_guest;
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else
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return -EACCES;
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hypfs_dbfs_create_file(&dbfs_file_2fc);
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return 0;
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}
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void hypfs_vm_exit(void)
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{
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if (!MACHINE_IS_VM)
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return;
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hypfs_dbfs_remove_file(&dbfs_file_2fc);
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}
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