![Sebastian Ott](/assets/img/avatar_default.png)
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1350 lines
33 KiB
C
1350 lines
33 KiB
C
/*
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* linux/drivers/s390/cio/cmf.c
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*
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* Linux on zSeries Channel Measurement Facility support
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*
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* Copyright 2000,2006 IBM Corporation
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*
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* Authors: Arnd Bergmann <arndb@de.ibm.com>
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* Cornelia Huck <cornelia.huck@de.ibm.com>
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*
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* original idea from Natarajan Krishnaswami <nkrishna@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define KMSG_COMPONENT "cio"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/bootmem.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#include <linux/timex.h> /* get_clock() */
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include <asm/cmb.h>
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#include <asm/div64.h>
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#include "cio.h"
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#include "css.h"
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#include "device.h"
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#include "ioasm.h"
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#include "chsc.h"
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/*
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* parameter to enable cmf during boot, possible uses are:
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* "s390cmf" -- enable cmf and allocate 2 MB of ram so measuring can be
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* used on any subchannel
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* "s390cmf=<num>" -- enable cmf and allocate enough memory to measure
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* <num> subchannel, where <num> is an integer
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* between 1 and 65535, default is 1024
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*/
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#define ARGSTRING "s390cmf"
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/* indices for READCMB */
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enum cmb_index {
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/* basic and exended format: */
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cmb_ssch_rsch_count,
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cmb_sample_count,
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cmb_device_connect_time,
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cmb_function_pending_time,
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cmb_device_disconnect_time,
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cmb_control_unit_queuing_time,
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cmb_device_active_only_time,
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/* extended format only: */
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cmb_device_busy_time,
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cmb_initial_command_response_time,
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};
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/**
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* enum cmb_format - types of supported measurement block formats
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*
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* @CMF_BASIC: traditional channel measurement blocks supported
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* by all machines that we run on
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* @CMF_EXTENDED: improved format that was introduced with the z990
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* machine
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* @CMF_AUTODETECT: default: use extended format when running on a machine
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* supporting extended format, otherwise fall back to
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* basic format
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*/
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enum cmb_format {
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CMF_BASIC,
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CMF_EXTENDED,
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CMF_AUTODETECT = -1,
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};
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/*
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* format - actual format for all measurement blocks
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*
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* The format module parameter can be set to a value of 0 (zero)
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* or 1, indicating basic or extended format as described for
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* enum cmb_format.
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*/
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static int format = CMF_AUTODETECT;
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module_param(format, bool, 0444);
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/**
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* struct cmb_operations - functions to use depending on cmb_format
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*
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* Most of these functions operate on a struct ccw_device. There is only
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* one instance of struct cmb_operations because the format of the measurement
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* data is guaranteed to be the same for every ccw_device.
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*
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* @alloc: allocate memory for a channel measurement block,
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* either with the help of a special pool or with kmalloc
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* @free: free memory allocated with @alloc
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* @set: enable or disable measurement
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* @read: read a measurement entry at an index
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* @readall: read a measurement block in a common format
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* @reset: clear the data in the associated measurement block and
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* reset its time stamp
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* @align: align an allocated block so that the hardware can use it
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*/
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struct cmb_operations {
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int (*alloc) (struct ccw_device *);
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void (*free) (struct ccw_device *);
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int (*set) (struct ccw_device *, u32);
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u64 (*read) (struct ccw_device *, int);
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int (*readall)(struct ccw_device *, struct cmbdata *);
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void (*reset) (struct ccw_device *);
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void *(*align) (void *);
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/* private: */
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struct attribute_group *attr_group;
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};
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static struct cmb_operations *cmbops;
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struct cmb_data {
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void *hw_block; /* Pointer to block updated by hardware */
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void *last_block; /* Last changed block copied from hardware block */
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int size; /* Size of hw_block and last_block */
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unsigned long long last_update; /* when last_block was updated */
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};
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/*
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* Our user interface is designed in terms of nanoseconds,
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* while the hardware measures total times in its own
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* unit.
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*/
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static inline u64 time_to_nsec(u32 value)
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{
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return ((u64)value) * 128000ull;
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}
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/*
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* Users are usually interested in average times,
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* not accumulated time.
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* This also helps us with atomicity problems
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* when reading sinlge values.
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*/
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static inline u64 time_to_avg_nsec(u32 value, u32 count)
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{
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u64 ret;
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/* no samples yet, avoid division by 0 */
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if (count == 0)
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return 0;
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/* value comes in units of 128 µsec */
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ret = time_to_nsec(value);
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do_div(ret, count);
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return ret;
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}
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/*
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* Activate or deactivate the channel monitor. When area is NULL,
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* the monitor is deactivated. The channel monitor needs to
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* be active in order to measure subchannels, which also need
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* to be enabled.
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*/
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static inline void cmf_activate(void *area, unsigned int onoff)
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{
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register void * __gpr2 asm("2");
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register long __gpr1 asm("1");
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__gpr2 = area;
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__gpr1 = onoff ? 2 : 0;
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/* activate channel measurement */
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asm("schm" : : "d" (__gpr2), "d" (__gpr1) );
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}
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static int set_schib(struct ccw_device *cdev, u32 mme, int mbfc,
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unsigned long address)
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{
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struct subchannel *sch;
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sch = to_subchannel(cdev->dev.parent);
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sch->config.mme = mme;
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sch->config.mbfc = mbfc;
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/* address can be either a block address or a block index */
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if (mbfc)
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sch->config.mba = address;
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else
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sch->config.mbi = address;
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return cio_commit_config(sch);
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}
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struct set_schib_struct {
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u32 mme;
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int mbfc;
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unsigned long address;
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wait_queue_head_t wait;
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int ret;
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struct kref kref;
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};
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static void cmf_set_schib_release(struct kref *kref)
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{
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struct set_schib_struct *set_data;
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set_data = container_of(kref, struct set_schib_struct, kref);
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kfree(set_data);
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}
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#define CMF_PENDING 1
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static int set_schib_wait(struct ccw_device *cdev, u32 mme,
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int mbfc, unsigned long address)
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{
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struct set_schib_struct *set_data;
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int ret;
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spin_lock_irq(cdev->ccwlock);
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if (!cdev->private->cmb) {
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ret = -ENODEV;
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goto out;
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}
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set_data = kzalloc(sizeof(struct set_schib_struct), GFP_ATOMIC);
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if (!set_data) {
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ret = -ENOMEM;
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goto out;
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}
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init_waitqueue_head(&set_data->wait);
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kref_init(&set_data->kref);
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set_data->mme = mme;
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set_data->mbfc = mbfc;
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set_data->address = address;
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ret = set_schib(cdev, mme, mbfc, address);
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if (ret != -EBUSY)
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goto out_put;
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if (cdev->private->state != DEV_STATE_ONLINE) {
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/* if the device is not online, don't even try again */
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ret = -EBUSY;
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goto out_put;
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}
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cdev->private->state = DEV_STATE_CMFCHANGE;
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set_data->ret = CMF_PENDING;
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cdev->private->cmb_wait = set_data;
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spin_unlock_irq(cdev->ccwlock);
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if (wait_event_interruptible(set_data->wait,
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set_data->ret != CMF_PENDING)) {
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spin_lock_irq(cdev->ccwlock);
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if (set_data->ret == CMF_PENDING) {
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set_data->ret = -ERESTARTSYS;
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if (cdev->private->state == DEV_STATE_CMFCHANGE)
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cdev->private->state = DEV_STATE_ONLINE;
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}
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spin_unlock_irq(cdev->ccwlock);
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}
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spin_lock_irq(cdev->ccwlock);
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cdev->private->cmb_wait = NULL;
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ret = set_data->ret;
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out_put:
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kref_put(&set_data->kref, cmf_set_schib_release);
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out:
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spin_unlock_irq(cdev->ccwlock);
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return ret;
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}
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void retry_set_schib(struct ccw_device *cdev)
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{
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struct set_schib_struct *set_data;
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set_data = cdev->private->cmb_wait;
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if (!set_data) {
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WARN_ON(1);
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return;
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}
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kref_get(&set_data->kref);
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set_data->ret = set_schib(cdev, set_data->mme, set_data->mbfc,
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set_data->address);
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wake_up(&set_data->wait);
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kref_put(&set_data->kref, cmf_set_schib_release);
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}
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static int cmf_copy_block(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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void *reference_buf;
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void *hw_block;
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struct cmb_data *cmb_data;
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sch = to_subchannel(cdev->dev.parent);
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if (cio_update_schib(sch))
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return -ENODEV;
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if (scsw_fctl(&sch->schib.scsw) & SCSW_FCTL_START_FUNC) {
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/* Don't copy if a start function is in progress. */
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if ((!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_SUSPENDED)) &&
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(scsw_actl(&sch->schib.scsw) &
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(SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) &&
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(!(scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_SEC_STATUS)))
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return -EBUSY;
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}
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cmb_data = cdev->private->cmb;
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hw_block = cmbops->align(cmb_data->hw_block);
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if (!memcmp(cmb_data->last_block, hw_block, cmb_data->size))
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/* No need to copy. */
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return 0;
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reference_buf = kzalloc(cmb_data->size, GFP_ATOMIC);
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if (!reference_buf)
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return -ENOMEM;
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/* Ensure consistency of block copied from hardware. */
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do {
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memcpy(cmb_data->last_block, hw_block, cmb_data->size);
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memcpy(reference_buf, hw_block, cmb_data->size);
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} while (memcmp(cmb_data->last_block, reference_buf, cmb_data->size));
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cmb_data->last_update = get_clock();
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kfree(reference_buf);
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return 0;
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}
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struct copy_block_struct {
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wait_queue_head_t wait;
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int ret;
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struct kref kref;
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};
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static void cmf_copy_block_release(struct kref *kref)
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{
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struct copy_block_struct *copy_block;
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copy_block = container_of(kref, struct copy_block_struct, kref);
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kfree(copy_block);
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}
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static int cmf_cmb_copy_wait(struct ccw_device *cdev)
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{
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struct copy_block_struct *copy_block;
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int ret;
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unsigned long flags;
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spin_lock_irqsave(cdev->ccwlock, flags);
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if (!cdev->private->cmb) {
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ret = -ENODEV;
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goto out;
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}
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copy_block = kzalloc(sizeof(struct copy_block_struct), GFP_ATOMIC);
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if (!copy_block) {
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ret = -ENOMEM;
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goto out;
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}
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init_waitqueue_head(©_block->wait);
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kref_init(©_block->kref);
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ret = cmf_copy_block(cdev);
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if (ret != -EBUSY)
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goto out_put;
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if (cdev->private->state != DEV_STATE_ONLINE) {
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ret = -EBUSY;
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goto out_put;
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}
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cdev->private->state = DEV_STATE_CMFUPDATE;
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copy_block->ret = CMF_PENDING;
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cdev->private->cmb_wait = copy_block;
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spin_unlock_irqrestore(cdev->ccwlock, flags);
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if (wait_event_interruptible(copy_block->wait,
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copy_block->ret != CMF_PENDING)) {
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spin_lock_irqsave(cdev->ccwlock, flags);
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if (copy_block->ret == CMF_PENDING) {
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copy_block->ret = -ERESTARTSYS;
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if (cdev->private->state == DEV_STATE_CMFUPDATE)
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cdev->private->state = DEV_STATE_ONLINE;
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}
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spin_unlock_irqrestore(cdev->ccwlock, flags);
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}
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spin_lock_irqsave(cdev->ccwlock, flags);
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cdev->private->cmb_wait = NULL;
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ret = copy_block->ret;
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out_put:
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kref_put(©_block->kref, cmf_copy_block_release);
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out:
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spin_unlock_irqrestore(cdev->ccwlock, flags);
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return ret;
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}
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void cmf_retry_copy_block(struct ccw_device *cdev)
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{
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struct copy_block_struct *copy_block;
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copy_block = cdev->private->cmb_wait;
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if (!copy_block) {
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WARN_ON(1);
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return;
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}
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kref_get(©_block->kref);
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copy_block->ret = cmf_copy_block(cdev);
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wake_up(©_block->wait);
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kref_put(©_block->kref, cmf_copy_block_release);
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}
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static void cmf_generic_reset(struct ccw_device *cdev)
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{
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struct cmb_data *cmb_data;
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spin_lock_irq(cdev->ccwlock);
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cmb_data = cdev->private->cmb;
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if (cmb_data) {
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memset(cmb_data->last_block, 0, cmb_data->size);
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/*
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* Need to reset hw block as well to make the hardware start
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* from 0 again.
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*/
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memset(cmbops->align(cmb_data->hw_block), 0, cmb_data->size);
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cmb_data->last_update = 0;
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}
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cdev->private->cmb_start_time = get_clock();
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spin_unlock_irq(cdev->ccwlock);
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}
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|
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/**
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* struct cmb_area - container for global cmb data
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*
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* @mem: pointer to CMBs (only in basic measurement mode)
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* @list: contains a linked list of all subchannels
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* @num_channels: number of channels to be measured
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* @lock: protect concurrent access to @mem and @list
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*/
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struct cmb_area {
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struct cmb *mem;
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struct list_head list;
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int num_channels;
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spinlock_t lock;
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};
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static struct cmb_area cmb_area = {
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.lock = __SPIN_LOCK_UNLOCKED(cmb_area.lock),
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.list = LIST_HEAD_INIT(cmb_area.list),
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.num_channels = 1024,
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};
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|
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/* ****** old style CMB handling ********/
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|
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/*
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* Basic channel measurement blocks are allocated in one contiguous
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* block of memory, which can not be moved as long as any channel
|
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* is active. Therefore, a maximum number of subchannels needs to
|
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* be defined somewhere. This is a module parameter, defaulting to
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* a resonable value of 1024, or 32 kb of memory.
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* Current kernels don't allow kmalloc with more than 128kb, so the
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* maximum is 4096.
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*/
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module_param_named(maxchannels, cmb_area.num_channels, uint, 0444);
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|
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/**
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* struct cmb - basic channel measurement block
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* @ssch_rsch_count: number of ssch and rsch
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* @sample_count: number of samples
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* @device_connect_time: time of device connect
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* @function_pending_time: time of function pending
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* @device_disconnect_time: time of device disconnect
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* @control_unit_queuing_time: time of control unit queuing
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* @device_active_only_time: time of device active only
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* @reserved: unused in basic measurement mode
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*
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* The measurement block as used by the hardware. The fields are described
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* further in z/Architecture Principles of Operation, chapter 17.
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*
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* The cmb area made up from these blocks must be a contiguous array and may
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* not be reallocated or freed.
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* Only one cmb area can be present in the system.
|
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*/
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struct cmb {
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u16 ssch_rsch_count;
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u16 sample_count;
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u32 device_connect_time;
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u32 function_pending_time;
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u32 device_disconnect_time;
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u32 control_unit_queuing_time;
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u32 device_active_only_time;
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u32 reserved[2];
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};
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|
|
|
/*
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* Insert a single device into the cmb_area list.
|
|
* Called with cmb_area.lock held from alloc_cmb.
|
|
*/
|
|
static int alloc_cmb_single(struct ccw_device *cdev,
|
|
struct cmb_data *cmb_data)
|
|
{
|
|
struct cmb *cmb;
|
|
struct ccw_device_private *node;
|
|
int ret;
|
|
|
|
spin_lock_irq(cdev->ccwlock);
|
|
if (!list_empty(&cdev->private->cmb_list)) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Find first unused cmb in cmb_area.mem.
|
|
* This is a little tricky: cmb_area.list
|
|
* remains sorted by ->cmb->hw_data pointers.
|
|
*/
|
|
cmb = cmb_area.mem;
|
|
list_for_each_entry(node, &cmb_area.list, cmb_list) {
|
|
struct cmb_data *data;
|
|
data = node->cmb;
|
|
if ((struct cmb*)data->hw_block > cmb)
|
|
break;
|
|
cmb++;
|
|
}
|
|
if (cmb - cmb_area.mem >= cmb_area.num_channels) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* insert new cmb */
|
|
list_add_tail(&cdev->private->cmb_list, &node->cmb_list);
|
|
cmb_data->hw_block = cmb;
|
|
cdev->private->cmb = cmb_data;
|
|
ret = 0;
|
|
out:
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
return ret;
|
|
}
|
|
|
|
static int alloc_cmb(struct ccw_device *cdev)
|
|
{
|
|
int ret;
|
|
struct cmb *mem;
|
|
ssize_t size;
|
|
struct cmb_data *cmb_data;
|
|
|
|
/* Allocate private cmb_data. */
|
|
cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL);
|
|
if (!cmb_data)
|
|
return -ENOMEM;
|
|
|
|
cmb_data->last_block = kzalloc(sizeof(struct cmb), GFP_KERNEL);
|
|
if (!cmb_data->last_block) {
|
|
kfree(cmb_data);
|
|
return -ENOMEM;
|
|
}
|
|
cmb_data->size = sizeof(struct cmb);
|
|
spin_lock(&cmb_area.lock);
|
|
|
|
if (!cmb_area.mem) {
|
|
/* there is no user yet, so we need a new area */
|
|
size = sizeof(struct cmb) * cmb_area.num_channels;
|
|
WARN_ON(!list_empty(&cmb_area.list));
|
|
|
|
spin_unlock(&cmb_area.lock);
|
|
mem = (void*)__get_free_pages(GFP_KERNEL | GFP_DMA,
|
|
get_order(size));
|
|
spin_lock(&cmb_area.lock);
|
|
|
|
if (cmb_area.mem) {
|
|
/* ok, another thread was faster */
|
|
free_pages((unsigned long)mem, get_order(size));
|
|
} else if (!mem) {
|
|
/* no luck */
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
} else {
|
|
/* everything ok */
|
|
memset(mem, 0, size);
|
|
cmb_area.mem = mem;
|
|
cmf_activate(cmb_area.mem, 1);
|
|
}
|
|
}
|
|
|
|
/* do the actual allocation */
|
|
ret = alloc_cmb_single(cdev, cmb_data);
|
|
out:
|
|
spin_unlock(&cmb_area.lock);
|
|
if (ret) {
|
|
kfree(cmb_data->last_block);
|
|
kfree(cmb_data);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void free_cmb(struct ccw_device *cdev)
|
|
{
|
|
struct ccw_device_private *priv;
|
|
struct cmb_data *cmb_data;
|
|
|
|
spin_lock(&cmb_area.lock);
|
|
spin_lock_irq(cdev->ccwlock);
|
|
|
|
priv = cdev->private;
|
|
|
|
if (list_empty(&priv->cmb_list)) {
|
|
/* already freed */
|
|
goto out;
|
|
}
|
|
|
|
cmb_data = priv->cmb;
|
|
priv->cmb = NULL;
|
|
if (cmb_data)
|
|
kfree(cmb_data->last_block);
|
|
kfree(cmb_data);
|
|
list_del_init(&priv->cmb_list);
|
|
|
|
if (list_empty(&cmb_area.list)) {
|
|
ssize_t size;
|
|
size = sizeof(struct cmb) * cmb_area.num_channels;
|
|
cmf_activate(NULL, 0);
|
|
free_pages((unsigned long)cmb_area.mem, get_order(size));
|
|
cmb_area.mem = NULL;
|
|
}
|
|
out:
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
spin_unlock(&cmb_area.lock);
|
|
}
|
|
|
|
static int set_cmb(struct ccw_device *cdev, u32 mme)
|
|
{
|
|
u16 offset;
|
|
struct cmb_data *cmb_data;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(cdev->ccwlock, flags);
|
|
if (!cdev->private->cmb) {
|
|
spin_unlock_irqrestore(cdev->ccwlock, flags);
|
|
return -EINVAL;
|
|
}
|
|
cmb_data = cdev->private->cmb;
|
|
offset = mme ? (struct cmb *)cmb_data->hw_block - cmb_area.mem : 0;
|
|
spin_unlock_irqrestore(cdev->ccwlock, flags);
|
|
|
|
return set_schib_wait(cdev, mme, 0, offset);
|
|
}
|
|
|
|
static u64 read_cmb(struct ccw_device *cdev, int index)
|
|
{
|
|
struct cmb *cmb;
|
|
u32 val;
|
|
int ret;
|
|
unsigned long flags;
|
|
|
|
ret = cmf_cmb_copy_wait(cdev);
|
|
if (ret < 0)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(cdev->ccwlock, flags);
|
|
if (!cdev->private->cmb) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
cmb = ((struct cmb_data *)cdev->private->cmb)->last_block;
|
|
|
|
switch (index) {
|
|
case cmb_ssch_rsch_count:
|
|
ret = cmb->ssch_rsch_count;
|
|
goto out;
|
|
case cmb_sample_count:
|
|
ret = cmb->sample_count;
|
|
goto out;
|
|
case cmb_device_connect_time:
|
|
val = cmb->device_connect_time;
|
|
break;
|
|
case cmb_function_pending_time:
|
|
val = cmb->function_pending_time;
|
|
break;
|
|
case cmb_device_disconnect_time:
|
|
val = cmb->device_disconnect_time;
|
|
break;
|
|
case cmb_control_unit_queuing_time:
|
|
val = cmb->control_unit_queuing_time;
|
|
break;
|
|
case cmb_device_active_only_time:
|
|
val = cmb->device_active_only_time;
|
|
break;
|
|
default:
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
ret = time_to_avg_nsec(val, cmb->sample_count);
|
|
out:
|
|
spin_unlock_irqrestore(cdev->ccwlock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static int readall_cmb(struct ccw_device *cdev, struct cmbdata *data)
|
|
{
|
|
struct cmb *cmb;
|
|
struct cmb_data *cmb_data;
|
|
u64 time;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
ret = cmf_cmb_copy_wait(cdev);
|
|
if (ret < 0)
|
|
return ret;
|
|
spin_lock_irqsave(cdev->ccwlock, flags);
|
|
cmb_data = cdev->private->cmb;
|
|
if (!cmb_data) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
if (cmb_data->last_update == 0) {
|
|
ret = -EAGAIN;
|
|
goto out;
|
|
}
|
|
cmb = cmb_data->last_block;
|
|
time = cmb_data->last_update - cdev->private->cmb_start_time;
|
|
|
|
memset(data, 0, sizeof(struct cmbdata));
|
|
|
|
/* we only know values before device_busy_time */
|
|
data->size = offsetof(struct cmbdata, device_busy_time);
|
|
|
|
/* convert to nanoseconds */
|
|
data->elapsed_time = (time * 1000) >> 12;
|
|
|
|
/* copy data to new structure */
|
|
data->ssch_rsch_count = cmb->ssch_rsch_count;
|
|
data->sample_count = cmb->sample_count;
|
|
|
|
/* time fields are converted to nanoseconds while copying */
|
|
data->device_connect_time = time_to_nsec(cmb->device_connect_time);
|
|
data->function_pending_time = time_to_nsec(cmb->function_pending_time);
|
|
data->device_disconnect_time =
|
|
time_to_nsec(cmb->device_disconnect_time);
|
|
data->control_unit_queuing_time
|
|
= time_to_nsec(cmb->control_unit_queuing_time);
|
|
data->device_active_only_time
|
|
= time_to_nsec(cmb->device_active_only_time);
|
|
ret = 0;
|
|
out:
|
|
spin_unlock_irqrestore(cdev->ccwlock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static void reset_cmb(struct ccw_device *cdev)
|
|
{
|
|
cmf_generic_reset(cdev);
|
|
}
|
|
|
|
static void * align_cmb(void *area)
|
|
{
|
|
return area;
|
|
}
|
|
|
|
static struct attribute_group cmf_attr_group;
|
|
|
|
static struct cmb_operations cmbops_basic = {
|
|
.alloc = alloc_cmb,
|
|
.free = free_cmb,
|
|
.set = set_cmb,
|
|
.read = read_cmb,
|
|
.readall = readall_cmb,
|
|
.reset = reset_cmb,
|
|
.align = align_cmb,
|
|
.attr_group = &cmf_attr_group,
|
|
};
|
|
|
|
/* ******** extended cmb handling ********/
|
|
|
|
/**
|
|
* struct cmbe - extended channel measurement block
|
|
* @ssch_rsch_count: number of ssch and rsch
|
|
* @sample_count: number of samples
|
|
* @device_connect_time: time of device connect
|
|
* @function_pending_time: time of function pending
|
|
* @device_disconnect_time: time of device disconnect
|
|
* @control_unit_queuing_time: time of control unit queuing
|
|
* @device_active_only_time: time of device active only
|
|
* @device_busy_time: time of device busy
|
|
* @initial_command_response_time: initial command response time
|
|
* @reserved: unused
|
|
*
|
|
* The measurement block as used by the hardware. May be in any 64 bit physical
|
|
* location.
|
|
* The fields are described further in z/Architecture Principles of Operation,
|
|
* third edition, chapter 17.
|
|
*/
|
|
struct cmbe {
|
|
u32 ssch_rsch_count;
|
|
u32 sample_count;
|
|
u32 device_connect_time;
|
|
u32 function_pending_time;
|
|
u32 device_disconnect_time;
|
|
u32 control_unit_queuing_time;
|
|
u32 device_active_only_time;
|
|
u32 device_busy_time;
|
|
u32 initial_command_response_time;
|
|
u32 reserved[7];
|
|
};
|
|
|
|
/*
|
|
* kmalloc only guarantees 8 byte alignment, but we need cmbe
|
|
* pointers to be naturally aligned. Make sure to allocate
|
|
* enough space for two cmbes.
|
|
*/
|
|
static inline struct cmbe *cmbe_align(struct cmbe *c)
|
|
{
|
|
unsigned long addr;
|
|
addr = ((unsigned long)c + sizeof (struct cmbe) - sizeof(long)) &
|
|
~(sizeof (struct cmbe) - sizeof(long));
|
|
return (struct cmbe*)addr;
|
|
}
|
|
|
|
static int alloc_cmbe(struct ccw_device *cdev)
|
|
{
|
|
struct cmbe *cmbe;
|
|
struct cmb_data *cmb_data;
|
|
int ret;
|
|
|
|
cmbe = kzalloc (sizeof (*cmbe) * 2, GFP_KERNEL);
|
|
if (!cmbe)
|
|
return -ENOMEM;
|
|
cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL);
|
|
if (!cmb_data) {
|
|
ret = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
cmb_data->last_block = kzalloc(sizeof(struct cmbe), GFP_KERNEL);
|
|
if (!cmb_data->last_block) {
|
|
ret = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
cmb_data->size = sizeof(struct cmbe);
|
|
spin_lock_irq(cdev->ccwlock);
|
|
if (cdev->private->cmb) {
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
ret = -EBUSY;
|
|
goto out_free;
|
|
}
|
|
cmb_data->hw_block = cmbe;
|
|
cdev->private->cmb = cmb_data;
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
|
|
/* activate global measurement if this is the first channel */
|
|
spin_lock(&cmb_area.lock);
|
|
if (list_empty(&cmb_area.list))
|
|
cmf_activate(NULL, 1);
|
|
list_add_tail(&cdev->private->cmb_list, &cmb_area.list);
|
|
spin_unlock(&cmb_area.lock);
|
|
|
|
return 0;
|
|
out_free:
|
|
if (cmb_data)
|
|
kfree(cmb_data->last_block);
|
|
kfree(cmb_data);
|
|
kfree(cmbe);
|
|
return ret;
|
|
}
|
|
|
|
static void free_cmbe(struct ccw_device *cdev)
|
|
{
|
|
struct cmb_data *cmb_data;
|
|
|
|
spin_lock_irq(cdev->ccwlock);
|
|
cmb_data = cdev->private->cmb;
|
|
cdev->private->cmb = NULL;
|
|
if (cmb_data)
|
|
kfree(cmb_data->last_block);
|
|
kfree(cmb_data);
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
|
|
/* deactivate global measurement if this is the last channel */
|
|
spin_lock(&cmb_area.lock);
|
|
list_del_init(&cdev->private->cmb_list);
|
|
if (list_empty(&cmb_area.list))
|
|
cmf_activate(NULL, 0);
|
|
spin_unlock(&cmb_area.lock);
|
|
}
|
|
|
|
static int set_cmbe(struct ccw_device *cdev, u32 mme)
|
|
{
|
|
unsigned long mba;
|
|
struct cmb_data *cmb_data;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(cdev->ccwlock, flags);
|
|
if (!cdev->private->cmb) {
|
|
spin_unlock_irqrestore(cdev->ccwlock, flags);
|
|
return -EINVAL;
|
|
}
|
|
cmb_data = cdev->private->cmb;
|
|
mba = mme ? (unsigned long) cmbe_align(cmb_data->hw_block) : 0;
|
|
spin_unlock_irqrestore(cdev->ccwlock, flags);
|
|
|
|
return set_schib_wait(cdev, mme, 1, mba);
|
|
}
|
|
|
|
|
|
static u64 read_cmbe(struct ccw_device *cdev, int index)
|
|
{
|
|
struct cmbe *cmb;
|
|
struct cmb_data *cmb_data;
|
|
u32 val;
|
|
int ret;
|
|
unsigned long flags;
|
|
|
|
ret = cmf_cmb_copy_wait(cdev);
|
|
if (ret < 0)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(cdev->ccwlock, flags);
|
|
cmb_data = cdev->private->cmb;
|
|
if (!cmb_data) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
cmb = cmb_data->last_block;
|
|
|
|
switch (index) {
|
|
case cmb_ssch_rsch_count:
|
|
ret = cmb->ssch_rsch_count;
|
|
goto out;
|
|
case cmb_sample_count:
|
|
ret = cmb->sample_count;
|
|
goto out;
|
|
case cmb_device_connect_time:
|
|
val = cmb->device_connect_time;
|
|
break;
|
|
case cmb_function_pending_time:
|
|
val = cmb->function_pending_time;
|
|
break;
|
|
case cmb_device_disconnect_time:
|
|
val = cmb->device_disconnect_time;
|
|
break;
|
|
case cmb_control_unit_queuing_time:
|
|
val = cmb->control_unit_queuing_time;
|
|
break;
|
|
case cmb_device_active_only_time:
|
|
val = cmb->device_active_only_time;
|
|
break;
|
|
case cmb_device_busy_time:
|
|
val = cmb->device_busy_time;
|
|
break;
|
|
case cmb_initial_command_response_time:
|
|
val = cmb->initial_command_response_time;
|
|
break;
|
|
default:
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
ret = time_to_avg_nsec(val, cmb->sample_count);
|
|
out:
|
|
spin_unlock_irqrestore(cdev->ccwlock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static int readall_cmbe(struct ccw_device *cdev, struct cmbdata *data)
|
|
{
|
|
struct cmbe *cmb;
|
|
struct cmb_data *cmb_data;
|
|
u64 time;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
ret = cmf_cmb_copy_wait(cdev);
|
|
if (ret < 0)
|
|
return ret;
|
|
spin_lock_irqsave(cdev->ccwlock, flags);
|
|
cmb_data = cdev->private->cmb;
|
|
if (!cmb_data) {
|
|
ret = -ENODEV;
|
|
goto out;
|
|
}
|
|
if (cmb_data->last_update == 0) {
|
|
ret = -EAGAIN;
|
|
goto out;
|
|
}
|
|
time = cmb_data->last_update - cdev->private->cmb_start_time;
|
|
|
|
memset (data, 0, sizeof(struct cmbdata));
|
|
|
|
/* we only know values before device_busy_time */
|
|
data->size = offsetof(struct cmbdata, device_busy_time);
|
|
|
|
/* conver to nanoseconds */
|
|
data->elapsed_time = (time * 1000) >> 12;
|
|
|
|
cmb = cmb_data->last_block;
|
|
/* copy data to new structure */
|
|
data->ssch_rsch_count = cmb->ssch_rsch_count;
|
|
data->sample_count = cmb->sample_count;
|
|
|
|
/* time fields are converted to nanoseconds while copying */
|
|
data->device_connect_time = time_to_nsec(cmb->device_connect_time);
|
|
data->function_pending_time = time_to_nsec(cmb->function_pending_time);
|
|
data->device_disconnect_time =
|
|
time_to_nsec(cmb->device_disconnect_time);
|
|
data->control_unit_queuing_time
|
|
= time_to_nsec(cmb->control_unit_queuing_time);
|
|
data->device_active_only_time
|
|
= time_to_nsec(cmb->device_active_only_time);
|
|
data->device_busy_time = time_to_nsec(cmb->device_busy_time);
|
|
data->initial_command_response_time
|
|
= time_to_nsec(cmb->initial_command_response_time);
|
|
|
|
ret = 0;
|
|
out:
|
|
spin_unlock_irqrestore(cdev->ccwlock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static void reset_cmbe(struct ccw_device *cdev)
|
|
{
|
|
cmf_generic_reset(cdev);
|
|
}
|
|
|
|
static void * align_cmbe(void *area)
|
|
{
|
|
return cmbe_align(area);
|
|
}
|
|
|
|
static struct attribute_group cmf_attr_group_ext;
|
|
|
|
static struct cmb_operations cmbops_extended = {
|
|
.alloc = alloc_cmbe,
|
|
.free = free_cmbe,
|
|
.set = set_cmbe,
|
|
.read = read_cmbe,
|
|
.readall = readall_cmbe,
|
|
.reset = reset_cmbe,
|
|
.align = align_cmbe,
|
|
.attr_group = &cmf_attr_group_ext,
|
|
};
|
|
|
|
static ssize_t cmb_show_attr(struct device *dev, char *buf, enum cmb_index idx)
|
|
{
|
|
return sprintf(buf, "%lld\n",
|
|
(unsigned long long) cmf_read(to_ccwdev(dev), idx));
|
|
}
|
|
|
|
static ssize_t cmb_show_avg_sample_interval(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct ccw_device *cdev;
|
|
long interval;
|
|
unsigned long count;
|
|
struct cmb_data *cmb_data;
|
|
|
|
cdev = to_ccwdev(dev);
|
|
count = cmf_read(cdev, cmb_sample_count);
|
|
spin_lock_irq(cdev->ccwlock);
|
|
cmb_data = cdev->private->cmb;
|
|
if (count) {
|
|
interval = cmb_data->last_update -
|
|
cdev->private->cmb_start_time;
|
|
interval = (interval * 1000) >> 12;
|
|
interval /= count;
|
|
} else
|
|
interval = -1;
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
return sprintf(buf, "%ld\n", interval);
|
|
}
|
|
|
|
static ssize_t cmb_show_avg_utilization(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct cmbdata data;
|
|
u64 utilization;
|
|
unsigned long t, u;
|
|
int ret;
|
|
|
|
ret = cmf_readall(to_ccwdev(dev), &data);
|
|
if (ret == -EAGAIN || ret == -ENODEV)
|
|
/* No data (yet/currently) available to use for calculation. */
|
|
return sprintf(buf, "n/a\n");
|
|
else if (ret)
|
|
return ret;
|
|
|
|
utilization = data.device_connect_time +
|
|
data.function_pending_time +
|
|
data.device_disconnect_time;
|
|
|
|
/* shift to avoid long long division */
|
|
while (-1ul < (data.elapsed_time | utilization)) {
|
|
utilization >>= 8;
|
|
data.elapsed_time >>= 8;
|
|
}
|
|
|
|
/* calculate value in 0.1 percent units */
|
|
t = (unsigned long) data.elapsed_time / 1000;
|
|
u = (unsigned long) utilization / t;
|
|
|
|
return sprintf(buf, "%02ld.%01ld%%\n", u/ 10, u - (u/ 10) * 10);
|
|
}
|
|
|
|
#define cmf_attr(name) \
|
|
static ssize_t show_##name(struct device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ return cmb_show_attr((dev), buf, cmb_##name); } \
|
|
static DEVICE_ATTR(name, 0444, show_##name, NULL);
|
|
|
|
#define cmf_attr_avg(name) \
|
|
static ssize_t show_avg_##name(struct device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ return cmb_show_attr((dev), buf, cmb_##name); } \
|
|
static DEVICE_ATTR(avg_##name, 0444, show_avg_##name, NULL);
|
|
|
|
cmf_attr(ssch_rsch_count);
|
|
cmf_attr(sample_count);
|
|
cmf_attr_avg(device_connect_time);
|
|
cmf_attr_avg(function_pending_time);
|
|
cmf_attr_avg(device_disconnect_time);
|
|
cmf_attr_avg(control_unit_queuing_time);
|
|
cmf_attr_avg(device_active_only_time);
|
|
cmf_attr_avg(device_busy_time);
|
|
cmf_attr_avg(initial_command_response_time);
|
|
|
|
static DEVICE_ATTR(avg_sample_interval, 0444, cmb_show_avg_sample_interval,
|
|
NULL);
|
|
static DEVICE_ATTR(avg_utilization, 0444, cmb_show_avg_utilization, NULL);
|
|
|
|
static struct attribute *cmf_attributes[] = {
|
|
&dev_attr_avg_sample_interval.attr,
|
|
&dev_attr_avg_utilization.attr,
|
|
&dev_attr_ssch_rsch_count.attr,
|
|
&dev_attr_sample_count.attr,
|
|
&dev_attr_avg_device_connect_time.attr,
|
|
&dev_attr_avg_function_pending_time.attr,
|
|
&dev_attr_avg_device_disconnect_time.attr,
|
|
&dev_attr_avg_control_unit_queuing_time.attr,
|
|
&dev_attr_avg_device_active_only_time.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group cmf_attr_group = {
|
|
.name = "cmf",
|
|
.attrs = cmf_attributes,
|
|
};
|
|
|
|
static struct attribute *cmf_attributes_ext[] = {
|
|
&dev_attr_avg_sample_interval.attr,
|
|
&dev_attr_avg_utilization.attr,
|
|
&dev_attr_ssch_rsch_count.attr,
|
|
&dev_attr_sample_count.attr,
|
|
&dev_attr_avg_device_connect_time.attr,
|
|
&dev_attr_avg_function_pending_time.attr,
|
|
&dev_attr_avg_device_disconnect_time.attr,
|
|
&dev_attr_avg_control_unit_queuing_time.attr,
|
|
&dev_attr_avg_device_active_only_time.attr,
|
|
&dev_attr_avg_device_busy_time.attr,
|
|
&dev_attr_avg_initial_command_response_time.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group cmf_attr_group_ext = {
|
|
.name = "cmf",
|
|
.attrs = cmf_attributes_ext,
|
|
};
|
|
|
|
static ssize_t cmb_enable_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", to_ccwdev(dev)->private->cmb ? 1 : 0);
|
|
}
|
|
|
|
static ssize_t cmb_enable_store(struct device *dev,
|
|
struct device_attribute *attr, const char *buf,
|
|
size_t c)
|
|
{
|
|
struct ccw_device *cdev;
|
|
int ret;
|
|
unsigned long val;
|
|
|
|
ret = strict_strtoul(buf, 16, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cdev = to_ccwdev(dev);
|
|
|
|
switch (val) {
|
|
case 0:
|
|
ret = disable_cmf(cdev);
|
|
break;
|
|
case 1:
|
|
ret = enable_cmf(cdev);
|
|
break;
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
DEVICE_ATTR(cmb_enable, 0644, cmb_enable_show, cmb_enable_store);
|
|
|
|
int ccw_set_cmf(struct ccw_device *cdev, int enable)
|
|
{
|
|
return cmbops->set(cdev, enable ? 2 : 0);
|
|
}
|
|
|
|
/**
|
|
* enable_cmf() - switch on the channel measurement for a specific device
|
|
* @cdev: The ccw device to be enabled
|
|
*
|
|
* Returns %0 for success or a negative error value.
|
|
*
|
|
* Context:
|
|
* non-atomic
|
|
*/
|
|
int enable_cmf(struct ccw_device *cdev)
|
|
{
|
|
int ret;
|
|
|
|
ret = cmbops->alloc(cdev);
|
|
cmbops->reset(cdev);
|
|
if (ret)
|
|
return ret;
|
|
ret = cmbops->set(cdev, 2);
|
|
if (ret) {
|
|
cmbops->free(cdev);
|
|
return ret;
|
|
}
|
|
ret = sysfs_create_group(&cdev->dev.kobj, cmbops->attr_group);
|
|
if (!ret)
|
|
return 0;
|
|
cmbops->set(cdev, 0); //FIXME: this can fail
|
|
cmbops->free(cdev);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* disable_cmf() - switch off the channel measurement for a specific device
|
|
* @cdev: The ccw device to be disabled
|
|
*
|
|
* Returns %0 for success or a negative error value.
|
|
*
|
|
* Context:
|
|
* non-atomic
|
|
*/
|
|
int disable_cmf(struct ccw_device *cdev)
|
|
{
|
|
int ret;
|
|
|
|
ret = cmbops->set(cdev, 0);
|
|
if (ret)
|
|
return ret;
|
|
cmbops->free(cdev);
|
|
sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* cmf_read() - read one value from the current channel measurement block
|
|
* @cdev: the channel to be read
|
|
* @index: the index of the value to be read
|
|
*
|
|
* Returns the value read or %0 if the value cannot be read.
|
|
*
|
|
* Context:
|
|
* any
|
|
*/
|
|
u64 cmf_read(struct ccw_device *cdev, int index)
|
|
{
|
|
return cmbops->read(cdev, index);
|
|
}
|
|
|
|
/**
|
|
* cmf_readall() - read the current channel measurement block
|
|
* @cdev: the channel to be read
|
|
* @data: a pointer to a data block that will be filled
|
|
*
|
|
* Returns %0 on success, a negative error value otherwise.
|
|
*
|
|
* Context:
|
|
* any
|
|
*/
|
|
int cmf_readall(struct ccw_device *cdev, struct cmbdata *data)
|
|
{
|
|
return cmbops->readall(cdev, data);
|
|
}
|
|
|
|
/* Reenable cmf when a disconnected device becomes available again. */
|
|
int cmf_reenable(struct ccw_device *cdev)
|
|
{
|
|
cmbops->reset(cdev);
|
|
return cmbops->set(cdev, 2);
|
|
}
|
|
|
|
static int __init init_cmf(void)
|
|
{
|
|
char *format_string;
|
|
char *detect_string = "parameter";
|
|
|
|
/*
|
|
* If the user did not give a parameter, see if we are running on a
|
|
* machine supporting extended measurement blocks, otherwise fall back
|
|
* to basic mode.
|
|
*/
|
|
if (format == CMF_AUTODETECT) {
|
|
if (!css_general_characteristics.ext_mb) {
|
|
format = CMF_BASIC;
|
|
} else {
|
|
format = CMF_EXTENDED;
|
|
}
|
|
detect_string = "autodetected";
|
|
} else {
|
|
detect_string = "parameter";
|
|
}
|
|
|
|
switch (format) {
|
|
case CMF_BASIC:
|
|
format_string = "basic";
|
|
cmbops = &cmbops_basic;
|
|
break;
|
|
case CMF_EXTENDED:
|
|
format_string = "extended";
|
|
cmbops = &cmbops_extended;
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
pr_info("Channel measurement facility initialized using format "
|
|
"%s (mode %s)\n", format_string, detect_string);
|
|
return 0;
|
|
}
|
|
|
|
module_init(init_cmf);
|
|
|
|
|
|
MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("channel measurement facility base driver\n"
|
|
"Copyright 2003 IBM Corporation\n");
|
|
|
|
EXPORT_SYMBOL_GPL(enable_cmf);
|
|
EXPORT_SYMBOL_GPL(disable_cmf);
|
|
EXPORT_SYMBOL_GPL(cmf_read);
|
|
EXPORT_SYMBOL_GPL(cmf_readall);
|