hypfs_diag.c

linux 内核源代码

static void diag204_free_buffer(void)
{
	if (!diag204_buf)
		return;
	if (diag204_buf_vmalloc) {
		vfree(diag204_buf_vmalloc);
		diag204_buf_vmalloc = NULL;
	} else {
		free_pages((unsigned long) diag204_buf, 0);
	}
	diag204_buf_pages = 0;
	diag204_buf = NULL;
}

static void *diag204_alloc_vbuf(int pages)
{
	/* The buffer has to be page aligned! */
	diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1));
	if (!diag204_buf_vmalloc)
		return ERR_PTR(-ENOMEM);
	diag204_buf = (void*)((unsigned long)diag204_buf_vmalloc
				& ~0xfffUL) + 0x1000;
	diag204_buf_pages = pages;
	return diag204_buf;
}

static void *diag204_alloc_rbuf(void)
{
	diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
	if (!diag204_buf)
		return ERR_PTR(-ENOMEM);
	diag204_buf_pages = 1;
	return diag204_buf;
}

static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
{
	if (diag204_buf) {
		*pages = diag204_buf_pages;
		return diag204_buf;
	}
	if (fmt == INFO_SIMPLE) {
		*pages = 1;
		return diag204_alloc_rbuf();
	} else {/* INFO_EXT */
		*pages = diag204((unsigned long)SUBC_RSI |
				 (unsigned long)INFO_EXT, 0, NULL);
		if (*pages <= 0)
			return ERR_PTR(-ENOSYS);
		else
			return diag204_alloc_vbuf(*pages);
	}
}

/*
 * diag204_probe() has to find out, which type of diagnose 204 implementation
 * we have on our machine. Currently there are three possible scanarios:
 *   - subcode 4   + simple data format (only one page)
 *   - subcode 4-6 + extended data format
 *   - subcode 4-7 + extended data format
 *
 * Subcode 5 is used to retrieve the size of the data, provided by subcodes
 * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
 * to subcode 6 it provides also information about secondary cpus.
 * In order to get as much information as possible, we first try
 * subcode 7, then 6 and if both fail, we use subcode 4.
 */

static int diag204_probe(void)
{
	void *buf;
	int pages, rc;

	buf = diag204_get_buffer(INFO_EXT, &pages);
	if (!IS_ERR(buf)) {
		if (diag204((unsigned long)SUBC_STIB7 |
			    (unsigned long)INFO_EXT, pages, buf) >= 0) {
			diag204_store_sc = SUBC_STIB7;
			diag204_info_type = INFO_EXT;
			goto out;
		}
		if (diag204((unsigned long)SUBC_STIB6 |
			    (unsigned long)INFO_EXT, pages, buf) >= 0) {
			diag204_store_sc = SUBC_STIB7;
			diag204_info_type = INFO_EXT;
			goto out;
		}
		diag204_free_buffer();
	}

	/* subcodes 6 and 7 failed, now try subcode 4 */

	buf = diag204_get_buffer(INFO_SIMPLE, &pages);
	if (IS_ERR(buf)) {
		rc = PTR_ERR(buf);
		goto fail_alloc;
	}
	if (diag204((unsigned long)SUBC_STIB4 |
		    (unsigned long)INFO_SIMPLE, pages, buf) >= 0) {
		diag204_store_sc = SUBC_STIB4;
		diag204_info_type = INFO_SIMPLE;
		goto out;
	} else {
		rc = -ENOSYS;
		goto fail_store;
	}
out:
	rc = 0;
fail_store:
	diag204_free_buffer();
fail_alloc:
	return rc;
}

static void *diag204_store(void)
{
	void *buf;
	int pages;

	buf = diag204_get_buffer(diag204_info_type, &pages);
	if (IS_ERR(buf))
		goto out;
	if (diag204((unsigned long)diag204_store_sc |
		    (unsigned long)diag204_info_type, pages, buf) < 0)
		return ERR_PTR(-ENOSYS);
out:
	return buf;
}

/* Diagnose 224 functions */

static int diag224(void *ptr)
{
	int rc = -ENOTSUPP;

	asm volatile(
		"	diag	%1,%2,0x224\n"
		"0:	lhi	%0,0x0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "+d" (rc) :"d" (0), "d" (ptr) : "memory");
	return rc;
}

static int diag224_get_name_table(void)
{
	/* memory must be below 2GB */
	diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
	if (!diag224_cpu_names)
		return -ENOMEM;
	if (diag224(diag224_cpu_names)) {
		kfree(diag224_cpu_names);
		return -ENOTSUPP;
	}
	EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
	return 0;
}

static void diag224_delete_name_table(void)
{
	kfree(diag224_cpu_names);
}

static int diag224_idx2name(int index, char *name)
{
	memcpy(name, diag224_cpu_names + ((index + 1) * CPU_NAME_LEN),
		CPU_NAME_LEN);
	name[CPU_NAME_LEN] = 0;
	strstrip(name);
	return 0;
}

__init int hypfs_diag_init(void)
{
	int rc;

	if (diag204_probe()) {
		printk(KERN_ERR "hypfs: diag 204 not working.");
		return -ENODATA;
	}
	rc = diag224_get_name_table();
	if (rc) {
		diag204_free_buffer();
		printk(KERN_ERR "hypfs: could not get name table.\n");
	}
	return rc;
}

void hypfs_diag_exit(void)
{
	diag224_delete_name_table();
	diag204_free_buffer();
}

/*
 * Functions to create the directory structure
 * *******************************************
 */

static int hypfs_create_cpu_files(struct super_block *sb,
				  struct dentry *cpus_dir, void *cpu_info)
{
	struct dentry *cpu_dir;
	char buffer[TMP_SIZE];
	void *rc;

	snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
							    cpu_info));
	cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
	rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
			      cpu_info__acc_time(diag204_info_type, cpu_info) -
			      cpu_info__lp_time(diag204_info_type, cpu_info));
	if (IS_ERR(rc))
		return PTR_ERR(rc);
	rc = hypfs_create_u64(sb, cpu_dir, "cputime",
			      cpu_info__lp_time(diag204_info_type, cpu_info));
	if (IS_ERR(rc))
		return PTR_ERR(rc);
	if (diag204_info_type == INFO_EXT) {
		rc = hypfs_create_u64(sb, cpu_dir, "onlinetime",
				      cpu_info__online_time(diag204_info_type,
							    cpu_info));
		if (IS_ERR(rc))
			return PTR_ERR(rc);
	}
	diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
	rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
	if (IS_ERR(rc))
		return PTR_ERR(rc);
	return 0;
}

static void *hypfs_create_lpar_files(struct super_block *sb,
				     struct dentry *systems_dir, void *part_hdr)
{
	struct dentry *cpus_dir;
	struct dentry *lpar_dir;
	char lpar_name[LPAR_NAME_LEN + 1];
	void *cpu_info;
	int i;

	part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
	lpar_name[LPAR_NAME_LEN] = 0;
	lpar_dir = hypfs_mkdir(sb, systems_dir, lpar_name);
	if (IS_ERR(lpar_dir))
		return lpar_dir;
	cpus_dir = hypfs_mkdir(sb, lpar_dir, "cpus");
	if (IS_ERR(cpus_dir))
		return cpus_dir;
	cpu_info = part_hdr + part_hdr__size(diag204_info_type);
	for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
		int rc;
		rc = hypfs_create_cpu_files(sb, cpus_dir, cpu_info);
		if (rc)
			return ERR_PTR(rc);
		cpu_info += cpu_info__size(diag204_info_type);
	}
	return cpu_info;
}

static int hypfs_create_phys_cpu_files(struct super_block *sb,
				       struct dentry *cpus_dir, void *cpu_info)
{
	struct dentry *cpu_dir;
	char buffer[TMP_SIZE];
	void *rc;

	snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
							    cpu_info));
	cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
	if (IS_ERR(cpu_dir))
		return PTR_ERR(cpu_dir);
	rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
			      phys_cpu__mgm_time(diag204_info_type, cpu_info));
	if (IS_ERR(rc))
		return PTR_ERR(rc);
	diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
	rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
	if (IS_ERR(rc))
		return PTR_ERR(rc);
	return 0;
}

static void *hypfs_create_phys_files(struct super_block *sb,
				     struct dentry *parent_dir, void *phys_hdr)
{
	int i;
	void *cpu_info;
	struct dentry *cpus_dir;

	cpus_dir = hypfs_mkdir(sb, parent_dir, "cpus");
	if (IS_ERR(cpus_dir))
		return cpus_dir;
	cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
	for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
		int rc;
		rc = hypfs_create_phys_cpu_files(sb, cpus_dir, cpu_info);
		if (rc)
			return ERR_PTR(rc);
		cpu_info += phys_cpu__size(diag204_info_type);
	}
	return cpu_info;
}

int hypfs_diag_create_files(struct super_block *sb, struct dentry *root)
{
	struct dentry *systems_dir, *hyp_dir;
	void *time_hdr, *part_hdr;
	int i, rc;
	void *buffer, *ptr;

	buffer = diag204_store();
	if (IS_ERR(buffer))
		return PTR_ERR(buffer);

	systems_dir = hypfs_mkdir(sb, root, "systems");
	if (IS_ERR(systems_dir)) {
		rc = PTR_ERR(systems_dir);
		goto err_out;
	}
	time_hdr = (struct x_info_blk_hdr *)buffer;
	part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
	for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
		part_hdr = hypfs_create_lpar_files(sb, systems_dir, part_hdr);
		if (IS_ERR(part_hdr)) {
			rc = PTR_ERR(part_hdr);
			goto err_out;
		}
	}
	if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) {
		ptr = hypfs_create_phys_files(sb, root, part_hdr);
		if (IS_ERR(ptr)) {
			rc = PTR_ERR(ptr);
			goto err_out;
		}
	}
	hyp_dir = hypfs_mkdir(sb, root, "hyp");
	if (IS_ERR(hyp_dir)) {
		rc = PTR_ERR(hyp_dir);
		goto err_out;
	}
	ptr = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor");
	if (IS_ERR(ptr)) {
		rc = PTR_ERR(ptr);
		goto err_out;
	}
	rc = 0;

err_out:
	return rc;
}