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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2015-02-09 14:49:10 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2015-02-10 16:38:58 +0100
commit34c0dad752294f373a0720840f59e186788ba227 (patch)
tree4d9da02c1edf8c5b4cf57016164747bfabd6faee /arch/s390/hypfs
parent45cce4ccafe3cddc924ef5221d22b9853fc9a13c (diff)
downloadlinux-34c0dad752294f373a0720840f59e186788ba227.tar.bz2
s390/hypfs: Add diagnose 0c support
With this feature, you can read the CPU performance metrics provided by the z/VM diagnose 0C. This then allows to get the management time for each online CPU of the guest where the diagnose is executed. The new debugfs file /sys/kernel/debug/s390_hypfs/diag_0c exports the diag0C binary data to user space via an open/read/close interface. The binary data consists out of a header structure followed by an array that contains the diagnose 0c data for each online CPU. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/hypfs')
-rw-r--r--arch/s390/hypfs/Makefile1
-rw-r--r--arch/s390/hypfs/hypfs.h4
-rw-r--r--arch/s390/hypfs/hypfs_diag0c.c139
-rw-r--r--arch/s390/hypfs/inode.c9
4 files changed, 152 insertions, 1 deletions
diff --git a/arch/s390/hypfs/Makefile b/arch/s390/hypfs/Makefile
index 06f8d95a16cd..2ee25ba252d6 100644
--- a/arch/s390/hypfs/Makefile
+++ b/arch/s390/hypfs/Makefile
@@ -5,3 +5,4 @@
obj-$(CONFIG_S390_HYPFS_FS) += s390_hypfs.o
s390_hypfs-objs := inode.o hypfs_diag.o hypfs_vm.o hypfs_dbfs.o hypfs_sprp.o
+s390_hypfs-objs += hypfs_diag0c.o
diff --git a/arch/s390/hypfs/hypfs.h b/arch/s390/hypfs/hypfs.h
index b34b5ab90a31..36d093fa9fb3 100644
--- a/arch/s390/hypfs/hypfs.h
+++ b/arch/s390/hypfs/hypfs.h
@@ -37,6 +37,10 @@ extern int hypfs_vm_init(void);
extern void hypfs_vm_exit(void);
extern int hypfs_vm_create_files(struct dentry *root);
+/* VM diagnose 0c */
+int hypfs_diag0c_init(void);
+void hypfs_diag0c_exit(void);
+
/* Set Partition-Resource Parameter */
int hypfs_sprp_init(void);
void hypfs_sprp_exit(void);
diff --git a/arch/s390/hypfs/hypfs_diag0c.c b/arch/s390/hypfs/hypfs_diag0c.c
new file mode 100644
index 000000000000..d4c0d3717543
--- /dev/null
+++ b/arch/s390/hypfs/hypfs_diag0c.c
@@ -0,0 +1,139 @@
+/*
+ * Hypervisor filesystem for Linux on s390
+ *
+ * Diag 0C implementation
+ *
+ * Copyright IBM Corp. 2014
+ */
+
+#include <linux/slab.h>
+#include <linux/cpu.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)
+{
+ asm volatile (
+#ifdef CONFIG_64BIT
+ " sam31\n"
+ " diag %0,%0,0x0c\n"
+ " sam64\n"
+#else
+ " diag %0,%0,0x0c\n"
+#endif
+ : /* 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);
+}
diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index c952b981e4f2..4c8008dd938e 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -482,10 +482,14 @@ static int __init hypfs_init(void)
rc = -ENODATA;
goto fail_hypfs_vm_exit;
}
+ if (hypfs_diag0c_init()) {
+ rc = -ENODATA;
+ goto fail_hypfs_sprp_exit;
+ }
s390_kobj = kobject_create_and_add("s390", hypervisor_kobj);
if (!s390_kobj) {
rc = -ENOMEM;
- goto fail_hypfs_sprp_exit;
+ goto fail_hypfs_diag0c_exit;
}
rc = register_filesystem(&hypfs_type);
if (rc)
@@ -494,6 +498,8 @@ static int __init hypfs_init(void)
fail_filesystem:
kobject_put(s390_kobj);
+fail_hypfs_diag0c_exit:
+ hypfs_diag0c_exit();
fail_hypfs_sprp_exit:
hypfs_sprp_exit();
fail_hypfs_vm_exit:
@@ -510,6 +516,7 @@ static void __exit hypfs_exit(void)
{
unregister_filesystem(&hypfs_type);
kobject_put(s390_kobj);
+ hypfs_diag0c_exit();
hypfs_sprp_exit();
hypfs_vm_exit();
hypfs_diag_exit();