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authorMichael Holzheu <holzheu@de.ibm.com>2007-02-05 21:18:29 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-02-05 21:18:29 +0100
commit31cb4bd31a48f62105d037ad53192b94d4c08f53 (patch)
treeecfbdc24742474f3d14efb1799d7994bbaa67612 /arch/s390/hypfs/hypfs_vm.c
parent[S390] Add crypto support for 3592 tape devices (diff)
downloadlinux-dev-31cb4bd31a48f62105d037ad53192b94d4c08f53.tar.xz
linux-dev-31cb4bd31a48f62105d037ad53192b94d4c08f53.zip
[S390] Hypervisor filesystem (s390_hypfs) for z/VM
This is an extension of the already existing hypfs for LPAR (DIAG 204). Data returned by DIAG 2fc is exported using the s390_hypfs when Linux is running under z/VM. Information about cpus and memory is provided. Data is put into different virtual files which can be accessed from user space. All values are represented as ASCII strings Signed-off-by: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/hypfs/hypfs_vm.c')
-rw-r--r--arch/s390/hypfs/hypfs_vm.c231
1 files changed, 231 insertions, 0 deletions
diff --git a/arch/s390/hypfs/hypfs_vm.c b/arch/s390/hypfs/hypfs_vm.c
new file mode 100644
index 000000000000..d01fc8f799f0
--- /dev/null
+++ b/arch/s390/hypfs/hypfs_vm.c
@@ -0,0 +1,231 @@
+/*
+ * Hypervisor filesystem for Linux on s390. z/VM 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 NAME_LEN 8
+
+static char local_guest[] = " ";
+static char 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 cpu_min;
+ __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);
+ parm_list.addr = (unsigned long) addr ;
+ parm_list.size = size;
+ parm_list.fmt = 0x02;
+ memset(parm_list.aci_grp, 0x40, NAME_LEN);
+ rc = -1;
+
+ asm volatile(
+ " diag %0,%1,0x2fc\n"
+ "0:\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;
+}
+
+static struct diag2fc_data *diag2fc_store(char *query, int *count)
+{
+ int size;
+ struct diag2fc_data *data;
+
+ do {
+ size = diag2fc(0, query, NULL);
+ if (size < 0)
+ return ERR_PTR(-EACCES);
+ data = vmalloc(size);
+ if (!data)
+ return ERR_PTR(-ENOMEM);
+ if (diag2fc(size, query, data) == 0)
+ break;
+ vfree(data);
+ } while (1);
+ *count = (size / sizeof(*data));
+
+ return data;
+}
+
+static void diag2fc_free(void *data)
+{
+ vfree(data);
+}
+
+#define ATTRIBUTE(sb, dir, name, member) \
+do { \
+ void *rc; \
+ rc = hypfs_create_u64(sb, dir, name, member); \
+ if (IS_ERR(rc)) \
+ return PTR_ERR(rc); \
+} while(0)
+
+static int hpyfs_vm_create_guest(struct super_block *sb,
+ 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);
+ strstrip(guest_name);
+ guest_dir = hypfs_mkdir(sb, systems_dir, guest_name);
+ if (IS_ERR(guest_dir))
+ return PTR_ERR(guest_dir);
+ ATTRIBUTE(sb, guest_dir, "onlinetime_us", data->el_time);
+
+ /* logical cpu information */
+ cpus_dir = hypfs_mkdir(sb, guest_dir, "cpus");
+ if (IS_ERR(cpus_dir))
+ return PTR_ERR(cpus_dir);
+ ATTRIBUTE(sb, cpus_dir, "cputime_us", data->used_cpu);
+ ATTRIBUTE(sb, cpus_dir, "capped", capped_value);
+ ATTRIBUTE(sb, cpus_dir, "dedicated", dedicated_flag);
+ ATTRIBUTE(sb, cpus_dir, "count", data->vcpus);
+ ATTRIBUTE(sb, cpus_dir, "weight_min", data->cpu_min);
+ ATTRIBUTE(sb, cpus_dir, "weight_max", data->cpu_max);
+ ATTRIBUTE(sb, cpus_dir, "weight_cur", data->cpu_shares);
+
+ /* memory information */
+ mem_dir = hypfs_mkdir(sb, guest_dir, "mem");
+ if (IS_ERR(mem_dir))
+ return PTR_ERR(mem_dir);
+ ATTRIBUTE(sb, mem_dir, "min_KiB", data->mem_min_kb);
+ ATTRIBUTE(sb, mem_dir, "max_KiB", data->mem_max_kb);
+ ATTRIBUTE(sb, mem_dir, "used_KiB", data->mem_used_kb);
+ ATTRIBUTE(sb, mem_dir, "share_KiB", data->mem_share_kb);
+
+ /* samples */
+ samples_dir = hypfs_mkdir(sb, guest_dir, "samples");
+ if (IS_ERR(samples_dir))
+ return PTR_ERR(samples_dir);
+ ATTRIBUTE(sb, samples_dir, "cpu_using", data->cpu_use_samp);
+ ATTRIBUTE(sb, samples_dir, "cpu_delay", data->cpu_delay_samp);
+ ATTRIBUTE(sb, samples_dir, "mem_delay", data->page_wait_samp);
+ ATTRIBUTE(sb, samples_dir, "idle", data->idle_samp);
+ ATTRIBUTE(sb, samples_dir, "other", data->other_samp);
+ ATTRIBUTE(sb, samples_dir, "total", data->total_samp);
+ return 0;
+}
+
+int hypfs_vm_create_files(struct super_block *sb, struct dentry *root)
+{
+ struct dentry *dir, *file;
+ struct diag2fc_data *data;
+ int rc, i, count = 0;
+
+ data = diag2fc_store(guest_query, &count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ /* Hpervisor Info */
+ dir = hypfs_mkdir(sb, root, "hyp");
+ if (IS_ERR(dir)) {
+ rc = PTR_ERR(dir);
+ goto failed;
+ }
+ file = hypfs_create_str(sb, dir, "type", "z/VM Hypervisor");
+ if (IS_ERR(file)) {
+ rc = PTR_ERR(file);
+ goto failed;
+ }
+
+ /* physical cpus */
+ dir = hypfs_mkdir(sb, root, "cpus");
+ if (IS_ERR(dir)) {
+ rc = PTR_ERR(dir);
+ goto failed;
+ }
+ file = hypfs_create_u64(sb, dir, "count", data->lcpus);
+ if (IS_ERR(file)) {
+ rc = PTR_ERR(file);
+ goto failed;
+ }
+
+ /* guests */
+ dir = hypfs_mkdir(sb, root, "systems");
+ if (IS_ERR(dir)) {
+ rc = PTR_ERR(dir);
+ goto failed;
+ }
+
+ for (i = 0; i < count; i++) {
+ rc = hpyfs_vm_create_guest(sb, dir, &(data[i]));
+ if (rc)
+ goto failed;
+ }
+ diag2fc_free(data);
+ return 0;
+
+failed:
+ diag2fc_free(data);
+ return rc;
+}
+
+int hypfs_vm_init(void)
+{
+ 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;
+
+ return 0;
+}