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Commit 0facaa17 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

s390/sysinfo: convert /proc/sysinfo to seqfile 



The current proc implementation of the /proc/sysinfo file writes all
informations contained in all system information blocks to a single
page.
This is done by calling sprintf all the time in the expectation that
everything will fit into a single page. This however is not necessarily
true if the configuration of a machine is very large.
So convert /proc/sysinfo to avoid writing into random memory regions.

For readability reasons a couple of lines are longer than 80 characters.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 78609132

arch/s390/kernel/sysinfo.c

+115 −167
Original line number Diff line number Diff line
@@ -25,14 +25,14 @@ 
static inline int stsi_0(void)

{

	int rc = stsi(NULL, 0, 0, 0);



	return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);

}



static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len)

static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)

{

	if (stsi(info, 1, 1, 1) == -ENOSYS)

		return len;



		return;

	EBCASC(info->manufacturer, sizeof(info->manufacturer));

	EBCASC(info->type, sizeof(info->type));

	EBCASC(info->model, sizeof(info->model));
@@ -41,11 +41,8 @@ static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len) 
	EBCASC(info->model_capacity, sizeof(info->model_capacity));

	EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));

	EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));

	len += sprintf(page + len, "Manufacturer:         %-16.16s\n",

		       info->manufacturer);

	len += sprintf(page + len, "Type:                 %-4.4s\n",

		       info->type);

	if (info->model[0] != '\0')

	seq_printf(m, "Manufacturer:         %-16.16s\n", info->manufacturer);

	seq_printf(m, "Type:                 %-4.4s\n", info->type);

	/*

	 * Sigh: the model field has been renamed with System z9

	 * to model_capacity and a new model field has been added
@@ -53,46 +50,36 @@ static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len) 
	 * the "Model:" prints "model_capacity model" or just

	 * "model_capacity" if the model string is empty .

	 */

		len += sprintf(page + len,

			       "Model:                %-16.16s %-16.16s\n",

			       info->model_capacity, info->model);

	else

		len += sprintf(page + len, "Model:                %-16.16s\n",

			       info->model_capacity);

	len += sprintf(page + len, "Sequence Code:        %-16.16s\n",

		       info->sequence);

	len += sprintf(page + len, "Plant:                %-4.4s\n",

		       info->plant);

	len += sprintf(page + len, "Model Capacity:       %-16.16s %08u\n",

	seq_printf(m, "Model:                %-16.16s", info->model_capacity);

	if (info->model[0] != '\0')

		seq_printf(m, " %-16.16s", info->model);

	seq_putc(m, '\n');

	seq_printf(m, "Sequence Code:        %-16.16s\n", info->sequence);

	seq_printf(m, "Plant:                %-4.4s\n", info->plant);

	seq_printf(m, "Model Capacity:       %-16.16s %08u\n",

		   info->model_capacity, *(u32 *) info->model_cap_rating);

	if (info->model_perm_cap[0] != '\0')

		len += sprintf(page + len,

			       "Model Perm. Capacity: %-16.16s %08u\n",

		seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",

			   info->model_perm_cap,

			   *(u32 *) info->model_perm_cap_rating);

	if (info->model_temp_cap[0] != '\0')

		len += sprintf(page + len,

			       "Model Temp. Capacity: %-16.16s %08u\n",

		seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",

			   info->model_temp_cap,

			   *(u32 *) info->model_temp_cap_rating);

	if (info->cai) {

		len += sprintf(page + len,

			       "Capacity Adj. Ind.:   %d\n",

			       info->cai);

		len += sprintf(page + len, "Capacity Ch. Reason:  %d\n",

			       info->ccr);

		seq_printf(m, "Capacity Adj. Ind.:   %d\n", info->cai);

		seq_printf(m, "Capacity Ch. Reason:  %d\n", info->ccr);

	}

	return len;

}



static int stsi_15_1_x(struct sysinfo_15_1_x *info, char *page, int len)

static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)

{

	static int max_mnest;

	int i, rc;



	len += sprintf(page + len, "\n");

	seq_putc(m, '\n');

	if (!MACHINE_HAS_TOPOLOGY)

		return len;

		return;

	if (max_mnest) {

		stsi(info, 15, 1, max_mnest);

	} else {
@@ -102,40 +89,32 @@ static int stsi_15_1_x(struct sysinfo_15_1_x *info, char *page, int len) 
				break;

		}

	}

	len += sprintf(page + len, "CPU Topology HW:     ");

	seq_printf(m, "CPU Topology HW:     ");

	for (i = 0; i < TOPOLOGY_NR_MAG; i++)

		len += sprintf(page + len, " %d", info->mag[i]);

	len += sprintf(page + len, "\n");

		seq_printf(m, " %d", info->mag[i]);

	seq_putc(m, '\n');

#ifdef CONFIG_SCHED_MC

	store_topology(info);

	len += sprintf(page + len, "CPU Topology SW:     ");

	seq_printf(m, "CPU Topology SW:     ");

	for (i = 0; i < TOPOLOGY_NR_MAG; i++)

		len += sprintf(page + len, " %d", info->mag[i]);

	len += sprintf(page + len, "\n");

		seq_printf(m, " %d", info->mag[i]);

	seq_putc(m, '\n');

#endif

	return len;

}



static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)

static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)

{

	struct sysinfo_1_2_2_extension *ext;

	int i;



	if (stsi(info, 1, 2, 2) == -ENOSYS)

		return len;

		return;

	ext = (struct sysinfo_1_2_2_extension *)

		((unsigned long) info + info->acc_offset);



	len += sprintf(page + len, "CPUs Total:           %d\n",

		       info->cpus_total);

	len += sprintf(page + len, "CPUs Configured:      %d\n",

		       info->cpus_configured);

	len += sprintf(page + len, "CPUs Standby:         %d\n",

		       info->cpus_standby);

	len += sprintf(page + len, "CPUs Reserved:        %d\n",

		       info->cpus_reserved);



	if (info->format == 1) {

	seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);

	seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);

	seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);

	seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);

	/*

	 * Sigh 2. According to the specification the alternate

	 * capability field is a 32 bit floating point number
@@ -145,138 +124,107 @@ static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len) 
	 * The user-space needs to know about the strange

	 * encoding of the alternate cpu capability.

	 */

		len += sprintf(page + len, "Capability:           %u %u\n",

			       info->capability, ext->alt_capability);

		for (i = 2; i <= info->cpus_total; i++)

			len += sprintf(page + len,

				       "Adjustment %02d-way:    %u %u\n",

				       i, info->adjustment[i-2],

				       ext->alt_adjustment[i-2]);



	} else {

		len += sprintf(page + len, "Capability:           %u\n",

			       info->capability);

		for (i = 2; i <= info->cpus_total; i++)

			len += sprintf(page + len,

				       "Adjustment %02d-way:    %u\n",

	seq_printf(m, "Capability:           %u", info->capability);

	if (info->format == 1)

		seq_printf(m, " %u", ext->alt_capability);

	seq_putc(m, '\n');

	for (i = 2; i <= info->cpus_total; i++) {

		seq_printf(m, "Adjustment %02d-way:    %u",

			   i, info->adjustment[i-2]);

		if (info->format == 1)

			seq_printf(m, " %u", ext->alt_adjustment[i-2]);

		seq_putc(m, '\n');

	}



	if (info->secondary_capability != 0)

		len += sprintf(page + len, "Secondary Capability: %d\n",

	if (info->secondary_capability)

		seq_printf(m, "Secondary Capability: %d\n",

			   info->secondary_capability);

	return len;

}



static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)

static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)

{

	if (stsi(info, 2, 2, 2) == -ENOSYS)

		return len;



		return;

	EBCASC(info->name, sizeof(info->name));



	len += sprintf(page + len, "\n");

	len += sprintf(page + len, "LPAR Number:          %d\n",

		       info->lpar_number);



	len += sprintf(page + len, "LPAR Characteristics: ");

	seq_putc(m, '\n');

	seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);

	seq_printf(m, "LPAR Characteristics: ");

	if (info->characteristics & LPAR_CHAR_DEDICATED)

		len += sprintf(page + len, "Dedicated ");

		seq_printf(m, "Dedicated ");

	if (info->characteristics & LPAR_CHAR_SHARED)

		len += sprintf(page + len, "Shared ");

		seq_printf(m, "Shared ");

	if (info->characteristics & LPAR_CHAR_LIMITED)

		len += sprintf(page + len, "Limited ");

	len += sprintf(page + len, "\n");



	len += sprintf(page + len, "LPAR Name:            %-8.8s\n",

		       info->name);



	len += sprintf(page + len, "LPAR Adjustment:      %d\n",

		       info->caf);



	len += sprintf(page + len, "LPAR CPUs Total:      %d\n",

		       info->cpus_total);

	len += sprintf(page + len, "LPAR CPUs Configured: %d\n",

		       info->cpus_configured);

	len += sprintf(page + len, "LPAR CPUs Standby:    %d\n",

		       info->cpus_standby);

	len += sprintf(page + len, "LPAR CPUs Reserved:   %d\n",

		       info->cpus_reserved);

	len += sprintf(page + len, "LPAR CPUs Dedicated:  %d\n",

		       info->cpus_dedicated);

	len += sprintf(page + len, "LPAR CPUs Shared:     %d\n",

		       info->cpus_shared);

	return len;

		seq_printf(m, "Limited ");

	seq_putc(m, '\n');

	seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);

	seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);

	seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);

	seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);

	seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);

	seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);

	seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);

	seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);

}



static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)

static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)

{

	int i;



	if (stsi(info, 3, 2, 2) == -ENOSYS)

		return len;

		return;

	for (i = 0; i < info->count; i++) {

		EBCASC(info->vm[i].name, sizeof(info->vm[i].name));

		EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));

		len += sprintf(page + len, "\n");

		len += sprintf(page + len, "VM%02d Name:            %-8.8s\n",

			       i, info->vm[i].name);

		len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",

			       i, info->vm[i].cpi);



		len += sprintf(page + len, "VM%02d Adjustment:      %d\n",

			       i, info->vm[i].caf);



		len += sprintf(page + len, "VM%02d CPUs Total:      %d\n",

			       i, info->vm[i].cpus_total);

		len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",

			       i, info->vm[i].cpus_configured);

		len += sprintf(page + len, "VM%02d CPUs Standby:    %d\n",

			       i, info->vm[i].cpus_standby);

		len += sprintf(page + len, "VM%02d CPUs Reserved:   %d\n",

			       i, info->vm[i].cpus_reserved);

		seq_putc(m, '\n');

		seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);

		seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);

		seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);

		seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);

		seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);

		seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);

		seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);

	}

	return len;

}



static int proc_read_sysinfo(char *page, char **start,

			     off_t off, int count,

			     int *eof, void *data)

static int sysinfo_show(struct seq_file *m, void *v)

{

	unsigned long info = get_zeroed_page(GFP_KERNEL);

	int level, len;

	void *info = (void *)get_zeroed_page(GFP_KERNEL);

	int level;



	if (!info)

		return 0;



	len = 0;

	level = stsi_0();

	if (level >= 1)

		len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);



		stsi_1_1_1(m, info);

	if (level >= 1)

		len = stsi_15_1_x((struct sysinfo_15_1_x *) info, page, len);



		stsi_15_1_x(m, info);

	if (level >= 1)

		len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);



		stsi_1_2_2(m, info);

	if (level >= 2)

		len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);



		stsi_2_2_2(m, info);

	if (level >= 3)

		len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);

		stsi_3_2_2(m, info);

	free_page((unsigned long)info);

	return 0;

}



	free_page(info);

	return len;

static int sysinfo_open(struct inode *inode, struct file *file)

{

	return single_open(file, sysinfo_show, NULL);

}



static __init int create_proc_sysinfo(void)

static const struct file_operations sysinfo_fops = {

	.open		= sysinfo_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static int __init sysinfo_create_proc(void)

{

	create_proc_read_entry("sysinfo", 0444, NULL,

			       proc_read_sysinfo, NULL);

	proc_create("sysinfo", 0444, NULL, &sysinfo_fops);

	return 0;

}

device_initcall(create_proc_sysinfo);

device_initcall(sysinfo_create_proc);



/*

 * Service levels interface.