[mirror_ubuntu-artful-kernel.git] / arch / s390 / hypfs / hypfs_diag0c.c

/*
 * Hypervisor filesystem for Linux on s390
 *
 * Diag 0C implementation
 *
 * Copyright IBM Corp. 2014
 */

#include <linux/slab.h>
#include <linux/cpu.h>
#include <asm/diag.h>
#include <asm/hypfs.h>
#include "hypfs.h"

#define DBFS_D0C_HDR_VERSION 0

/*
 * Execute diagnose 0c in 31 bit mode
 */
static void diag0c(struct hypfs_diag0c_entry *entry)
{
	diag_stat_inc(DIAG_STAT_X00C);
	asm volatile (
		"	sam31\n"
		"	diag	%0,%0,0x0c\n"
		"	sam64\n"
		: /* no output register */
		: "a" (entry)
		: "memory");
}

/*
 * Get hypfs_diag0c_entry from CPU vector and store diag0c data
 */
static void diag0c_fn(void *data)
{
	diag0c(((void **) data)[smp_processor_id()]);
}

/*
 * Allocate buffer and store diag 0c data
 */
static void *diag0c_store(unsigned int *count)
{
	struct hypfs_diag0c_data *diag0c_data;
	unsigned int cpu_count, cpu, i;
	void **cpu_vec;

	get_online_cpus();
	cpu_count = num_online_cpus();
	cpu_vec = kmalloc(sizeof(*cpu_vec) * num_possible_cpus(), GFP_KERNEL);
	if (!cpu_vec)
		goto fail_put_online_cpus;
	/* Note: Diag 0c needs 8 byte alignment and real storage */
	diag0c_data = kzalloc(sizeof(struct hypfs_diag0c_hdr) +
			      cpu_count * sizeof(struct hypfs_diag0c_entry),
			      GFP_KERNEL | GFP_DMA);
	if (!diag0c_data)
		goto fail_kfree_cpu_vec;
	i = 0;
	/* Fill CPU vector for each online CPU */
	for_each_online_cpu(cpu) {
		diag0c_data->entry[i].cpu = cpu;
		cpu_vec[cpu] = &diag0c_data->entry[i++];
	}
	/* Collect data all CPUs */
	on_each_cpu(diag0c_fn, cpu_vec, 1);
	*count = cpu_count;
	kfree(cpu_vec);
	put_online_cpus();
	return diag0c_data;

fail_kfree_cpu_vec:
	kfree(cpu_vec);
fail_put_online_cpus:
	put_online_cpus();
	return ERR_PTR(-ENOMEM);
}

/*
 * Hypfs DBFS callback: Free diag 0c data
 */
static void dbfs_diag0c_free(const void *data)
{
	kfree(data);
}

/*
 * Hypfs DBFS callback: Create diag 0c data
 */
static int dbfs_diag0c_create(void **data, void **data_free_ptr, size_t *size)
{
	struct hypfs_diag0c_data *diag0c_data;
	unsigned int count;

	diag0c_data = diag0c_store(&count);
	if (IS_ERR(diag0c_data))
		return PTR_ERR(diag0c_data);
	memset(&diag0c_data->hdr, 0, sizeof(diag0c_data->hdr));
	get_tod_clock_ext(diag0c_data->hdr.tod_ext);
	diag0c_data->hdr.len = count * sizeof(struct hypfs_diag0c_entry);
	diag0c_data->hdr.version = DBFS_D0C_HDR_VERSION;
	diag0c_data->hdr.count = count;
	*data = diag0c_data;
	*data_free_ptr = diag0c_data;
	*size = diag0c_data->hdr.len + sizeof(struct hypfs_diag0c_hdr);
	return 0;
}

/*
 * Hypfs DBFS file structure
 */
static struct hypfs_dbfs_file dbfs_file_0c = {
	.name		= "diag_0c",
	.data_create	= dbfs_diag0c_create,
	.data_free	= dbfs_diag0c_free,
};

/*
 * Initialize diag 0c interface for z/VM
 */
int __init hypfs_diag0c_init(void)
{
	if (!MACHINE_IS_VM)
		return 0;
	return hypfs_dbfs_create_file(&dbfs_file_0c);
}

/*
 * Shutdown diag 0c interface for z/VM
 */
void hypfs_diag0c_exit(void)
{
	if (!MACHINE_IS_VM)
		return;
	hypfs_dbfs_remove_file(&dbfs_file_0c);
}
Commit	Line	Data
34c0dad7 MH	1	/*
	2	* Hypervisor filesystem for Linux on s390
	3	*
	4	* Diag 0C implementation
	5	*
	6	* Copyright IBM Corp. 2014
	7	*/
	8
	9	#include <linux/slab.h>
	10	#include <linux/cpu.h>
1ec2772e	11	#include <asm/diag.h>
34c0dad7 MH	12	#include <asm/hypfs.h>
	13	#include "hypfs.h"
	14
	15	#define DBFS_D0C_HDR_VERSION 0
	16
	17	/*
	18	* Execute diagnose 0c in 31 bit mode
	19	*/
	20	static void diag0c(struct hypfs_diag0c_entry *entry)
	21	{
1ec2772e	22	diag_stat_inc(DIAG_STAT_X00C);
34c0dad7	23	asm volatile (
34c0dad7 MH	24	" sam31\n"
	25	" diag %0,%0,0x0c\n"
	26	" sam64\n"
34c0dad7 MH	27	: /* no output register */
	28	: "a" (entry)
	29	: "memory");
	30	}
	31
	32	/*
	33	* Get hypfs_diag0c_entry from CPU vector and store diag0c data
	34	*/
	35	static void diag0c_fn(void *data)
	36	{
	37	diag0c(((void **) data)[smp_processor_id()]);
	38	}
	39
	40	/*
	41	* Allocate buffer and store diag 0c data
	42	*/
	43	static void diag0c_store(unsigned int count)
	44	{
	45	struct hypfs_diag0c_data *diag0c_data;
	46	unsigned int cpu_count, cpu, i;
	47	void **cpu_vec;
	48
	49	get_online_cpus();
	50	cpu_count = num_online_cpus();
	51	cpu_vec = kmalloc(sizeof(cpu_vec) num_possible_cpus(), GFP_KERNEL);
	52	if (!cpu_vec)
	53	goto fail_put_online_cpus;
	54	/* Note: Diag 0c needs 8 byte alignment and real storage */
	55	diag0c_data = kzalloc(sizeof(struct hypfs_diag0c_hdr) +
	56	cpu_count * sizeof(struct hypfs_diag0c_entry),
	57	GFP_KERNEL \| GFP_DMA);
	58	if (!diag0c_data)
	59	goto fail_kfree_cpu_vec;
	60	i = 0;
	61	/* Fill CPU vector for each online CPU */
	62	for_each_online_cpu(cpu) {
	63	diag0c_data->entry[i].cpu = cpu;
	64	cpu_vec[cpu] = &diag0c_data->entry[i++];
	65	}
	66	/* Collect data all CPUs */
	67	on_each_cpu(diag0c_fn, cpu_vec, 1);
	68	*count = cpu_count;
	69	kfree(cpu_vec);
	70	put_online_cpus();
	71	return diag0c_data;
	72
	73	fail_kfree_cpu_vec:
	74	kfree(cpu_vec);
	75	fail_put_online_cpus:
	76	put_online_cpus();
	77	return ERR_PTR(-ENOMEM);
	78	}
	79
	80	/*
	81	* Hypfs DBFS callback: Free diag 0c data
	82	*/
	83	static void dbfs_diag0c_free(const void *data)
	84	{
	85	kfree(data);
	86	}
	87
	88	/*
	89	* Hypfs DBFS callback: Create diag 0c data
	90	*/
91	static int dbfs_diag0c_create(void data, void data_free_ptr, size_t *size)
92	{
93	struct hypfs_diag0c_data *diag0c_data;
94	unsigned int count;
95
96	diag0c_data = diag0c_store(&count);
97	if (IS_ERR(diag0c_data))
98	return PTR_ERR(diag0c_data);
99	memset(&diag0c_data->hdr, 0, sizeof(diag0c_data->hdr));
100	get_tod_clock_ext(diag0c_data->hdr.tod_ext);
101	diag0c_data->hdr.len = count * sizeof(struct hypfs_diag0c_entry);
102	diag0c_data->hdr.version = DBFS_D0C_HDR_VERSION;
103	diag0c_data->hdr.count = count;
104	*data = diag0c_data;
105	*data_free_ptr = diag0c_data;
106	*size = diag0c_data->hdr.len + sizeof(struct hypfs_diag0c_hdr);
107	return 0;
108	}
109
110	/*
111	* Hypfs DBFS file structure
112	*/
113	static struct hypfs_dbfs_file dbfs_file_0c = {
114	.name = "diag_0c",
115	.data_create = dbfs_diag0c_create,
116	.data_free = dbfs_diag0c_free,
117	};
118
119	/*
120	* Initialize diag 0c interface for z/VM
121	*/
122	int __init hypfs_diag0c_init(void)
123	{
124	if (!MACHINE_IS_VM)
125	return 0;
126	return hypfs_dbfs_create_file(&dbfs_file_0c);
127	}
128
129	/*
130	* Shutdown diag 0c interface for z/VM
131	*/
132	void hypfs_diag0c_exit(void)
133	{
134	if (!MACHINE_IS_VM)
135	return;
136	hypfs_dbfs_remove_file(&dbfs_file_0c);
137	}