forked from luck/tmp_suning_uos_patched
34c0dad752
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>
140 lines
2.9 KiB
C
140 lines
2.9 KiB
C
/*
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* Hypervisor filesystem for Linux on s390
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*
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* Diag 0C implementation
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*
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* Copyright IBM Corp. 2014
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*/
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#include <linux/slab.h>
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#include <linux/cpu.h>
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#include <asm/hypfs.h>
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#include "hypfs.h"
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#define DBFS_D0C_HDR_VERSION 0
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/*
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* Execute diagnose 0c in 31 bit mode
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*/
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static void diag0c(struct hypfs_diag0c_entry *entry)
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{
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asm volatile (
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#ifdef CONFIG_64BIT
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" sam31\n"
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" diag %0,%0,0x0c\n"
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" sam64\n"
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#else
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" diag %0,%0,0x0c\n"
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#endif
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: /* no output register */
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: "a" (entry)
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: "memory");
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}
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/*
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* Get hypfs_diag0c_entry from CPU vector and store diag0c data
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*/
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static void diag0c_fn(void *data)
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{
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diag0c(((void **) data)[smp_processor_id()]);
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}
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/*
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* Allocate buffer and store diag 0c data
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*/
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static void *diag0c_store(unsigned int *count)
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{
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struct hypfs_diag0c_data *diag0c_data;
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unsigned int cpu_count, cpu, i;
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void **cpu_vec;
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get_online_cpus();
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cpu_count = num_online_cpus();
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cpu_vec = kmalloc(sizeof(*cpu_vec) * num_possible_cpus(), GFP_KERNEL);
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if (!cpu_vec)
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goto fail_put_online_cpus;
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/* Note: Diag 0c needs 8 byte alignment and real storage */
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diag0c_data = kzalloc(sizeof(struct hypfs_diag0c_hdr) +
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cpu_count * sizeof(struct hypfs_diag0c_entry),
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GFP_KERNEL | GFP_DMA);
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if (!diag0c_data)
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goto fail_kfree_cpu_vec;
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i = 0;
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/* Fill CPU vector for each online CPU */
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for_each_online_cpu(cpu) {
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diag0c_data->entry[i].cpu = cpu;
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cpu_vec[cpu] = &diag0c_data->entry[i++];
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}
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/* Collect data all CPUs */
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on_each_cpu(diag0c_fn, cpu_vec, 1);
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*count = cpu_count;
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kfree(cpu_vec);
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put_online_cpus();
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return diag0c_data;
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fail_kfree_cpu_vec:
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kfree(cpu_vec);
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fail_put_online_cpus:
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put_online_cpus();
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return ERR_PTR(-ENOMEM);
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}
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/*
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* Hypfs DBFS callback: Free diag 0c data
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*/
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static void dbfs_diag0c_free(const void *data)
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{
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kfree(data);
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}
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/*
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* Hypfs DBFS callback: Create diag 0c data
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*/
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static int dbfs_diag0c_create(void **data, void **data_free_ptr, size_t *size)
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{
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struct hypfs_diag0c_data *diag0c_data;
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unsigned int count;
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diag0c_data = diag0c_store(&count);
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if (IS_ERR(diag0c_data))
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return PTR_ERR(diag0c_data);
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memset(&diag0c_data->hdr, 0, sizeof(diag0c_data->hdr));
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get_tod_clock_ext(diag0c_data->hdr.tod_ext);
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diag0c_data->hdr.len = count * sizeof(struct hypfs_diag0c_entry);
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diag0c_data->hdr.version = DBFS_D0C_HDR_VERSION;
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diag0c_data->hdr.count = count;
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*data = diag0c_data;
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*data_free_ptr = diag0c_data;
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*size = diag0c_data->hdr.len + sizeof(struct hypfs_diag0c_hdr);
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return 0;
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}
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/*
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* Hypfs DBFS file structure
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*/
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static struct hypfs_dbfs_file dbfs_file_0c = {
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.name = "diag_0c",
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.data_create = dbfs_diag0c_create,
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.data_free = dbfs_diag0c_free,
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};
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/*
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* Initialize diag 0c interface for z/VM
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*/
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int __init hypfs_diag0c_init(void)
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{
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if (!MACHINE_IS_VM)
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return 0;
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return hypfs_dbfs_create_file(&dbfs_file_0c);
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}
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/*
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* Shutdown diag 0c interface for z/VM
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*/
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void hypfs_diag0c_exit(void)
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{
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if (!MACHINE_IS_VM)
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return;
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hypfs_dbfs_remove_file(&dbfs_file_0c);
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}
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