Merge rsync://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

Conflicts:

	include/linux/kernel.h

1 files changed, 696 insertions, 0 deletions

diff --git a/arch/s390/hypfs/hypfs_diag.c b/arch/s390/hypfs/hypfs_diag.c
new file mode 100644
index 000000000000..efa74af7f04a
--- /dev/null
+++ b/arch/s390/hypfs/hypfs_diag.c
@@ -0,0 +1,696 @@
+/*
+ *  fs/hypfs/hypfs_diag.c
+ *    Hypervisor filesystem for Linux on s390. Diag 204 and 224
+ *    implementation.
+ *
+ *    Copyright (C) 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/ebcdic.h>
+#include "hypfs.h"
+
+#define LPAR_NAME_LEN 8		/* lpar name len in diag 204 data */
+#define CPU_NAME_LEN 16		/* type name len of cpus in diag224 name table */
+#define TMP_SIZE 64		/* size of temporary buffers */
+
+/* diag 204 subcodes */
+enum diag204_sc {
+	SUBC_STIB4 = 4,
+	SUBC_RSI = 5,
+	SUBC_STIB6 = 6,
+	SUBC_STIB7 = 7
+};
+
+/* The two available diag 204 data formats */
+enum diag204_format {
+	INFO_SIMPLE = 0,
+	INFO_EXT = 0x00010000
+};
+
+/* bit is set in flags, when physical cpu info is included in diag 204 data */
+#define LPAR_PHYS_FLG  0x80
+
+static char *diag224_cpu_names;			/* diag 224 name table */
+static enum diag204_sc diag204_store_sc;	/* used subcode for store */
+static enum diag204_format diag204_info_type;	/* used diag 204 data format */
+
+static void *diag204_buf;		/* 4K aligned buffer for diag204 data */
+static void *diag204_buf_vmalloc;	/* vmalloc pointer for diag204 data */
+static int diag204_buf_pages;		/* number of pages for diag204 data */
+
+/*
+ * DIAG 204 data structures and member access functions.
+ *
+ * Since we have two different diag 204 data formats for old and new s390
+ * machines, we do not access the structs directly, but use getter functions for
+ * each struct member instead. This should make the code more readable.
+ */
+
+/* Time information block */
+
+struct info_blk_hdr {
+	__u8  npar;
+	__u8  flags;
+	__u16 tslice;
+	__u16 phys_cpus;
+	__u16 this_part;
+	__u64 curtod;
+} __attribute__ ((packed));
+
+struct x_info_blk_hdr {
+	__u8  npar;
+	__u8  flags;
+	__u16 tslice;
+	__u16 phys_cpus;
+	__u16 this_part;
+	__u64 curtod1;
+	__u64 curtod2;
+	char reserved[40];
+} __attribute__ ((packed));
+
+static inline int info_blk_hdr__size(enum diag204_format type)
+{
+	if (type == INFO_SIMPLE)
+		return sizeof(struct info_blk_hdr);
+	else /* INFO_EXT */
+		return sizeof(struct x_info_blk_hdr);
+}
+
+static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct info_blk_hdr *)hdr)->npar;
+	else /* INFO_EXT */
+		return ((struct x_info_blk_hdr *)hdr)->npar;
+}
+
+static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct info_blk_hdr *)hdr)->flags;
+	else /* INFO_EXT */
+		return ((struct x_info_blk_hdr *)hdr)->flags;
+}
+
+static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct info_blk_hdr *)hdr)->phys_cpus;
+	else /* INFO_EXT */
+		return ((struct x_info_blk_hdr *)hdr)->phys_cpus;
+}
+
+/* Partition header */
+
+struct part_hdr {
+	__u8 pn;
+	__u8 cpus;
+	char reserved[6];
+	char part_name[LPAR_NAME_LEN];
+} __attribute__ ((packed));
+
+struct x_part_hdr {
+	__u8  pn;
+	__u8  cpus;
+	__u8  rcpus;
+	__u8  pflag;
+	__u32 mlu;
+	char  part_name[LPAR_NAME_LEN];
+	char  lpc_name[8];
+	char  os_name[8];
+	__u64 online_cs;
+	__u64 online_es;
+	__u8  upid;
+	char  reserved1[3];
+	__u32 group_mlu;
+	char  group_name[8];
+	char  reserved2[32];
+} __attribute__ ((packed));
+
+static inline int part_hdr__size(enum diag204_format type)
+{
+	if (type == INFO_SIMPLE)
+		return sizeof(struct part_hdr);
+	else /* INFO_EXT */
+		return sizeof(struct x_part_hdr);
+}
+
+static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct part_hdr *)hdr)->cpus;
+	else /* INFO_EXT */
+		return ((struct x_part_hdr *)hdr)->rcpus;
+}
+
+static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
+				       char *name)
+{
+	if (type == INFO_SIMPLE)
+		memcpy(name, ((struct part_hdr *)hdr)->part_name,
+		       LPAR_NAME_LEN);
+	else /* INFO_EXT */
+		memcpy(name, ((struct x_part_hdr *)hdr)->part_name,
+		       LPAR_NAME_LEN);
+	EBCASC(name, LPAR_NAME_LEN);
+	name[LPAR_NAME_LEN] = 0;
+	strstrip(name);
+}
+
+struct cpu_info {
+	__u16 cpu_addr;
+	char  reserved1[2];
+	__u8  ctidx;
+	__u8  cflag;
+	__u16 weight;
+	__u64 acc_time;
+	__u64 lp_time;
+} __attribute__ ((packed));
+
+struct x_cpu_info {
+	__u16 cpu_addr;
+	char  reserved1[2];
+	__u8  ctidx;
+	__u8  cflag;
+	__u16 weight;
+	__u64 acc_time;
+	__u64 lp_time;
+	__u16 min_weight;
+	__u16 cur_weight;
+	__u16 max_weight;
+	char  reseved2[2];
+	__u64 online_time;
+	__u64 wait_time;
+	__u32 pma_weight;
+	__u32 polar_weight;
+	char  reserved3[40];
+} __attribute__ ((packed));
+
+/* CPU info block */
+
+static inline int cpu_info__size(enum diag204_format type)
+{
+	if (type == INFO_SIMPLE)
+		return sizeof(struct cpu_info);
+	else /* INFO_EXT */
+		return sizeof(struct x_cpu_info);
+}
+
+static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct cpu_info *)hdr)->ctidx;
+	else /* INFO_EXT */
+		return ((struct x_cpu_info *)hdr)->ctidx;
+}
+
+static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct cpu_info *)hdr)->cpu_addr;
+	else /* INFO_EXT */
+		return ((struct x_cpu_info *)hdr)->cpu_addr;
+}
+
+static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct cpu_info *)hdr)->acc_time;
+	else /* INFO_EXT */
+		return ((struct x_cpu_info *)hdr)->acc_time;
+}
+
+static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct cpu_info *)hdr)->lp_time;
+	else /* INFO_EXT */
+		return ((struct x_cpu_info *)hdr)->lp_time;
+}
+
+static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return 0;	/* online_time not available in simple info */
+	else /* INFO_EXT */
+		return ((struct x_cpu_info *)hdr)->online_time;
+}
+
+/* Physical header */
+
+struct phys_hdr {
+	char reserved1[1];
+	__u8 cpus;
+	char reserved2[6];
+	char mgm_name[8];
+} __attribute__ ((packed));
+
+struct x_phys_hdr {
+	char reserved1[1];
+	__u8 cpus;
+	char reserved2[6];
+	char mgm_name[8];
+	char reserved3[80];
+} __attribute__ ((packed));
+
+static inline int phys_hdr__size(enum diag204_format type)
+{
+	if (type == INFO_SIMPLE)
+		return sizeof(struct phys_hdr);
+	else /* INFO_EXT */
+		return sizeof(struct x_phys_hdr);
+}
+
+static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct phys_hdr *)hdr)->cpus;
+	else /* INFO_EXT */
+		return ((struct x_phys_hdr *)hdr)->cpus;
+}
+
+/* Physical CPU info block */
+
+struct phys_cpu {
+	__u16 cpu_addr;
+	char  reserved1[2];
+	__u8  ctidx;
+	char  reserved2[3];
+	__u64 mgm_time;
+	char  reserved3[8];
+} __attribute__ ((packed));
+
+struct x_phys_cpu {
+	__u16 cpu_addr;
+	char  reserved1[2];
+	__u8  ctidx;
+	char  reserved2[3];
+	__u64 mgm_time;
+	char  reserved3[80];
+} __attribute__ ((packed));
+
+static inline int phys_cpu__size(enum diag204_format type)
+{
+	if (type == INFO_SIMPLE)
+		return sizeof(struct phys_cpu);
+	else /* INFO_EXT */
+		return sizeof(struct x_phys_cpu);
+}
+
+static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct phys_cpu *)hdr)->cpu_addr;
+	else /* INFO_EXT */
+		return ((struct x_phys_cpu *)hdr)->cpu_addr;
+}
+
+static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct phys_cpu *)hdr)->mgm_time;
+	else /* INFO_EXT */
+		return ((struct x_phys_cpu *)hdr)->mgm_time;
+}
+
+static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
+{
+	if (type == INFO_SIMPLE)
+		return ((struct phys_cpu *)hdr)->ctidx;
+	else /* INFO_EXT */
+		return ((struct x_phys_cpu *)hdr)->ctidx;
+}
+
+/* Diagnose 204 functions */
+
+static int diag204(unsigned long subcode, unsigned long size, void *addr)
+{
+	register unsigned long _subcode asm("0") = subcode;
+	register unsigned long _size asm("1") = size;
+
+	asm volatile ("   diag    %2,%0,0x204\n"
+		      "0: \n" ".section __ex_table,\"a\"\n"
+#ifndef __s390x__
+		      "    .align 4\n"
+		      "    .long  0b,0b\n"
+#else
+		      "    .align 8\n"
+		      "    .quad  0b,0b\n"
+#endif
+		      ".previous":"+d" (_subcode), "+d"(_size)
+		      :"d"(addr)
+		      :"memory");
+	if (_subcode)
+		return -1;
+	else
+		return _size;
+}
+
+/*
+ * For the old diag subcode 4 with simple data format we have to use real
+ * memory. If we use subcode 6 or 7 with extended data format, we can (and
+ * should) use vmalloc, since we need a lot of memory in that case. Currently
+ * up to 93 pages!
+ */
+
+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(SUBC_RSI | INFO_EXT, 0, 0);
+		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(SUBC_STIB7 | INFO_EXT, pages, buf) >= 0) {
+			diag204_store_sc = SUBC_STIB7;
+			diag204_info_type = INFO_EXT;
+			goto out;
+		}
+		if (diag204(SUBC_STIB6 | 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(SUBC_STIB4 | 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(diag204_store_sc | diag204_info_type, pages, buf) < 0)
+		return ERR_PTR(-ENOSYS);
+out:
+	return buf;
+}
+
+/* Diagnose 224 functions */
+
+static void diag224(void *ptr)
+{
+	asm volatile("   diag    %0,%1,0x224\n"
+		     : :"d" (0), "d"(ptr) : "memory");
+}
+
+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;
+	diag224(diag224_cpu_names);
+	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) {
+		diag224_delete_name_table();
+		printk(KERN_ERR "hypfs: could not get name table.\n");
+	}
+	return rc;
+}
+
+__exit 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;
+}