arch/s390/hypfs/hypfs_vm.c - linux - Git at Google

 // 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);

 	/* Hpervisor 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);
 }
	// 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);

	/* Hpervisor 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);
	}