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