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![Cornelia Huck](/assets/img/avatar_default.png)
Make sure we use proper Return sections, and make the output for cmf_enable() less odd. Signed-off-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1309 lines
32 KiB
C
1309 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Linux on zSeries Channel Measurement Facility support
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*
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* Copyright IBM Corp. 2000, 2006
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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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#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/export.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_tod_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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avg_utilization = -1,
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/* basic and exended format: */
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cmb_ssch_rsch_count = 0,
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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, bint, 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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*/
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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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/* 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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#define CMF_OFF 0
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#define CMF_ON 2
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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;
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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 = to_subchannel(cdev->dev.parent);
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int ret;
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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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ret = cio_commit_config(sch);
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if (!mme && ret == -ENODEV) {
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/*
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* The task was to disable measurement block updates but
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* the subchannel is already gone. Report success.
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*/
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ret = 0;
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}
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return ret;
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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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};
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#define CMF_PENDING 1
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#define SET_SCHIB_TIMEOUT (10 * HZ)
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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 = -ENODEV;
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spin_lock_irq(cdev->ccwlock);
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if (!cdev->private->cmb)
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goto out;
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ret = set_schib(cdev, mme, mbfc, address);
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if (ret != -EBUSY)
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goto out;
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/* if the device is not online, don't even try again */
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if (cdev->private->state != DEV_STATE_ONLINE)
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goto out;
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init_waitqueue_head(&set_data.wait);
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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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set_data.ret = CMF_PENDING;
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cdev->private->state = DEV_STATE_CMFCHANGE;
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cdev->private->cmb_wait = &set_data;
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spin_unlock_irq(cdev->ccwlock);
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ret = wait_event_interruptible_timeout(set_data.wait,
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set_data.ret != CMF_PENDING,
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SET_SCHIB_TIMEOUT);
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spin_lock_irq(cdev->ccwlock);
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if (ret <= 0) {
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if (set_data.ret == CMF_PENDING) {
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set_data.ret = (ret == 0) ? -ETIME : ret;
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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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}
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cdev->private->cmb_wait = NULL;
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ret = set_data.ret;
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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 = cdev->private->cmb_wait;
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if (!set_data)
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return;
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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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}
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static int cmf_copy_block(struct ccw_device *cdev)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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struct cmb_data *cmb_data;
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void *hw_block;
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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 = cmb_data->hw_block;
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memcpy(cmb_data->last_block, hw_block, cmb_data->size);
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cmb_data->last_update = get_tod_clock();
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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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};
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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 = -ENODEV;
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spin_lock_irq(cdev->ccwlock);
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if (!cdev->private->cmb)
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goto out;
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ret = cmf_copy_block(cdev);
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if (ret != -EBUSY)
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goto out;
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if (cdev->private->state != DEV_STATE_ONLINE)
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goto out;
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init_waitqueue_head(©_block.wait);
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copy_block.ret = CMF_PENDING;
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cdev->private->state = DEV_STATE_CMFUPDATE;
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cdev->private->cmb_wait = ©_block;
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spin_unlock_irq(cdev->ccwlock);
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ret = wait_event_interruptible(copy_block.wait,
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copy_block.ret != CMF_PENDING);
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spin_lock_irq(cdev->ccwlock);
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if (ret) {
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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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}
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cdev->private->cmb_wait = NULL;
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ret = copy_block.ret;
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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 cmf_retry_copy_block(struct ccw_device *cdev)
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{
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struct copy_block_struct *copy_block = cdev->private->cmb_wait;
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if (!copy_block)
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return;
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copy_block->ret = cmf_copy_block(cdev);
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wake_up(©_block->wait);
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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(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_tod_clock();
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spin_unlock_irq(cdev->ccwlock);
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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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/* ****** old style CMB handling ********/
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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 reasonable 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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* 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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/*
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* Insert a single device into the cmb_area list.
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* Called with cmb_area.lock held from alloc_cmb.
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*/
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static int alloc_cmb_single(struct ccw_device *cdev,
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struct cmb_data *cmb_data)
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{
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struct cmb *cmb;
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struct ccw_device_private *node;
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int ret;
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spin_lock_irq(cdev->ccwlock);
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if (!list_empty(&cdev->private->cmb_list)) {
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ret = -EBUSY;
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goto out;
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}
|
|
|
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/*
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* Find first unused cmb in cmb_area.mem.
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* This is a little tricky: cmb_area.list
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* remains sorted by ->cmb->hw_data pointers.
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*/
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cmb = cmb_area.mem;
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list_for_each_entry(node, &cmb_area.list, cmb_list) {
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struct cmb_data *data;
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data = node->cmb;
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if ((struct cmb*)data->hw_block > cmb)
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break;
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cmb++;
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}
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if (cmb - cmb_area.mem >= cmb_area.num_channels) {
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ret = -ENOMEM;
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goto out;
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}
|
|
|
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/* insert new cmb */
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list_add_tail(&cdev->private->cmb_list, &node->cmb_list);
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cmb_data->hw_block = cmb;
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cdev->private->cmb = cmb_data;
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ret = 0;
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out:
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spin_unlock_irq(cdev->ccwlock);
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return ret;
|
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}
|
|
|
|
static int alloc_cmb(struct ccw_device *cdev)
|
|
{
|
|
int ret;
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struct cmb *mem;
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ssize_t size;
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struct cmb_data *cmb_data;
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|
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/* Allocate private cmb_data. */
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cmb_data = kzalloc(sizeof(struct cmb_data), GFP_KERNEL);
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if (!cmb_data)
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return -ENOMEM;
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|
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cmb_data->last_block = kzalloc(sizeof(struct cmb), GFP_KERNEL);
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|
if (!cmb_data->last_block) {
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kfree(cmb_data);
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return -ENOMEM;
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}
|
|
cmb_data->size = sizeof(struct cmb);
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spin_lock(&cmb_area.lock);
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|
|
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if (!cmb_area.mem) {
|
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/* there is no user yet, so we need a new area */
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|
size = sizeof(struct cmb) * cmb_area.num_channels;
|
|
WARN_ON(!list_empty(&cmb_area.list));
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|
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spin_unlock(&cmb_area.lock);
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mem = (void*)__get_free_pages(GFP_KERNEL | GFP_DMA,
|
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get_order(size));
|
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spin_lock(&cmb_area.lock);
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|
|
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, CMF_ON);
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
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, CMF_OFF);
|
|
free_pages((unsigned long)cmb_area.mem, get_order(size));
|
|
cmb_area.mem = NULL;
|
|
}
|
|
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);
|
|
}
|
|
|
|
/* calculate utilization in 0.1 percent units */
|
|
static u64 __cmb_utilization(u64 device_connect_time, u64 function_pending_time,
|
|
u64 device_disconnect_time, u64 start_time)
|
|
{
|
|
u64 utilization, elapsed_time;
|
|
|
|
utilization = time_to_nsec(device_connect_time +
|
|
function_pending_time +
|
|
device_disconnect_time);
|
|
|
|
elapsed_time = get_tod_clock() - start_time;
|
|
elapsed_time = tod_to_ns(elapsed_time);
|
|
elapsed_time /= 1000;
|
|
|
|
return elapsed_time ? (utilization / elapsed_time) : 0;
|
|
}
|
|
|
|
static u64 read_cmb(struct ccw_device *cdev, int index)
|
|
{
|
|
struct cmb_data *cmb_data;
|
|
unsigned long flags;
|
|
struct cmb *cmb;
|
|
u64 ret = 0;
|
|
u32 val;
|
|
|
|
spin_lock_irqsave(cdev->ccwlock, flags);
|
|
cmb_data = cdev->private->cmb;
|
|
if (!cmb_data)
|
|
goto out;
|
|
|
|
cmb = cmb_data->hw_block;
|
|
switch (index) {
|
|
case avg_utilization:
|
|
ret = __cmb_utilization(cmb->device_connect_time,
|
|
cmb->function_pending_time,
|
|
cmb->device_disconnect_time,
|
|
cdev->private->cmb_start_time);
|
|
goto out;
|
|
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:
|
|
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);
|
|
|
|
data->elapsed_time = tod_to_ns(time);
|
|
|
|
/* 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 int cmf_enabled(struct ccw_device *cdev)
|
|
{
|
|
int enabled;
|
|
|
|
spin_lock_irq(cdev->ccwlock);
|
|
enabled = !!cdev->private->cmb;
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
|
|
return enabled;
|
|
}
|
|
|
|
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,
|
|
.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];
|
|
} __packed __aligned(64);
|
|
|
|
static struct kmem_cache *cmbe_cache;
|
|
|
|
static int alloc_cmbe(struct ccw_device *cdev)
|
|
{
|
|
struct cmb_data *cmb_data;
|
|
struct cmbe *cmbe;
|
|
int ret = -ENOMEM;
|
|
|
|
cmbe = kmem_cache_zalloc(cmbe_cache, GFP_KERNEL);
|
|
if (!cmbe)
|
|
return ret;
|
|
|
|
cmb_data = kzalloc(sizeof(*cmb_data), GFP_KERNEL);
|
|
if (!cmb_data)
|
|
goto out_free;
|
|
|
|
cmb_data->last_block = kzalloc(sizeof(struct cmbe), GFP_KERNEL);
|
|
if (!cmb_data->last_block)
|
|
goto out_free;
|
|
|
|
cmb_data->size = sizeof(*cmbe);
|
|
cmb_data->hw_block = cmbe;
|
|
|
|
spin_lock(&cmb_area.lock);
|
|
spin_lock_irq(cdev->ccwlock);
|
|
if (cdev->private->cmb)
|
|
goto out_unlock;
|
|
|
|
cdev->private->cmb = cmb_data;
|
|
|
|
/* activate global measurement if this is the first channel */
|
|
if (list_empty(&cmb_area.list))
|
|
cmf_activate(NULL, CMF_ON);
|
|
list_add_tail(&cdev->private->cmb_list, &cmb_area.list);
|
|
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
spin_unlock(&cmb_area.lock);
|
|
return 0;
|
|
|
|
out_unlock:
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
spin_unlock(&cmb_area.lock);
|
|
ret = -EBUSY;
|
|
out_free:
|
|
if (cmb_data)
|
|
kfree(cmb_data->last_block);
|
|
kfree(cmb_data);
|
|
kmem_cache_free(cmbe_cache, cmbe);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void free_cmbe(struct ccw_device *cdev)
|
|
{
|
|
struct cmb_data *cmb_data;
|
|
|
|
spin_lock(&cmb_area.lock);
|
|
spin_lock_irq(cdev->ccwlock);
|
|
cmb_data = cdev->private->cmb;
|
|
cdev->private->cmb = NULL;
|
|
if (cmb_data) {
|
|
kfree(cmb_data->last_block);
|
|
kmem_cache_free(cmbe_cache, cmb_data->hw_block);
|
|
}
|
|
kfree(cmb_data);
|
|
|
|
/* deactivate global measurement if this is the last channel */
|
|
list_del_init(&cdev->private->cmb_list);
|
|
if (list_empty(&cmb_area.list))
|
|
cmf_activate(NULL, CMF_OFF);
|
|
spin_unlock_irq(cdev->ccwlock);
|
|
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) 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 cmb_data *cmb_data;
|
|
unsigned long flags;
|
|
struct cmbe *cmb;
|
|
u64 ret = 0;
|
|
u32 val;
|
|
|
|
spin_lock_irqsave(cdev->ccwlock, flags);
|
|
cmb_data = cdev->private->cmb;
|
|
if (!cmb_data)
|
|
goto out;
|
|
|
|
cmb = cmb_data->hw_block;
|
|
switch (index) {
|
|
case avg_utilization:
|
|
ret = __cmb_utilization(cmb->device_connect_time,
|
|
cmb->function_pending_time,
|
|
cmb->device_disconnect_time,
|
|
cdev->private->cmb_start_time);
|
|
goto out;
|
|
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:
|
|
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);
|
|
|
|
data->elapsed_time = tod_to_ns(time);
|
|
|
|
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 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,
|
|
.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 = to_ccwdev(dev);
|
|
unsigned long count;
|
|
long interval;
|
|
|
|
count = cmf_read(cdev, cmb_sample_count);
|
|
spin_lock_irq(cdev->ccwlock);
|
|
if (count) {
|
|
interval = get_tod_clock() - cdev->private->cmb_start_time;
|
|
interval = tod_to_ns(interval);
|
|
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)
|
|
{
|
|
unsigned long u = cmf_read(to_ccwdev(dev), avg_utilization);
|
|
|
|
return sprintf(buf, "%02lu.%01lu%%\n", u / 10, u % 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);
|
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#define cmf_attr_avg(name) \
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static ssize_t show_avg_##name(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ return cmb_show_attr((dev), buf, cmb_##name); } \
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static DEVICE_ATTR(avg_##name, 0444, show_avg_##name, NULL);
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cmf_attr(ssch_rsch_count);
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cmf_attr(sample_count);
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cmf_attr_avg(device_connect_time);
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cmf_attr_avg(function_pending_time);
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cmf_attr_avg(device_disconnect_time);
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cmf_attr_avg(control_unit_queuing_time);
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cmf_attr_avg(device_active_only_time);
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cmf_attr_avg(device_busy_time);
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cmf_attr_avg(initial_command_response_time);
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static DEVICE_ATTR(avg_sample_interval, 0444, cmb_show_avg_sample_interval,
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NULL);
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static DEVICE_ATTR(avg_utilization, 0444, cmb_show_avg_utilization, NULL);
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static struct attribute *cmf_attributes[] = {
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&dev_attr_avg_sample_interval.attr,
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&dev_attr_avg_utilization.attr,
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&dev_attr_ssch_rsch_count.attr,
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&dev_attr_sample_count.attr,
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&dev_attr_avg_device_connect_time.attr,
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&dev_attr_avg_function_pending_time.attr,
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&dev_attr_avg_device_disconnect_time.attr,
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&dev_attr_avg_control_unit_queuing_time.attr,
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&dev_attr_avg_device_active_only_time.attr,
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NULL,
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};
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static struct attribute_group cmf_attr_group = {
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.name = "cmf",
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.attrs = cmf_attributes,
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};
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static struct attribute *cmf_attributes_ext[] = {
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&dev_attr_avg_sample_interval.attr,
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&dev_attr_avg_utilization.attr,
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&dev_attr_ssch_rsch_count.attr,
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&dev_attr_sample_count.attr,
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&dev_attr_avg_device_connect_time.attr,
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&dev_attr_avg_function_pending_time.attr,
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&dev_attr_avg_device_disconnect_time.attr,
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&dev_attr_avg_control_unit_queuing_time.attr,
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&dev_attr_avg_device_active_only_time.attr,
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&dev_attr_avg_device_busy_time.attr,
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&dev_attr_avg_initial_command_response_time.attr,
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NULL,
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};
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static struct attribute_group cmf_attr_group_ext = {
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.name = "cmf",
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.attrs = cmf_attributes_ext,
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};
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static ssize_t cmb_enable_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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return sprintf(buf, "%d\n", cmf_enabled(cdev));
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}
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static ssize_t cmb_enable_store(struct device *dev,
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struct device_attribute *attr, const char *buf,
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size_t c)
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{
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struct ccw_device *cdev = to_ccwdev(dev);
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unsigned long val;
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int ret;
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ret = kstrtoul(buf, 16, &val);
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if (ret)
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return ret;
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switch (val) {
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case 0:
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ret = disable_cmf(cdev);
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break;
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case 1:
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ret = enable_cmf(cdev);
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break;
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default:
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ret = -EINVAL;
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}
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return ret ? ret : c;
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}
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DEVICE_ATTR_RW(cmb_enable);
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int ccw_set_cmf(struct ccw_device *cdev, int enable)
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{
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return cmbops->set(cdev, enable ? 2 : 0);
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}
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/**
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* enable_cmf() - switch on the channel measurement for a specific device
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* @cdev: The ccw device to be enabled
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*
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* Enable channel measurements for @cdev. If this is called on a device
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* for which channel measurement is already enabled a reset of the
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* measurement data is triggered.
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* Returns: %0 for success or a negative error value.
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* Context:
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* non-atomic
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*/
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int enable_cmf(struct ccw_device *cdev)
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{
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int ret = 0;
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device_lock(&cdev->dev);
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if (cmf_enabled(cdev)) {
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cmbops->reset(cdev);
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goto out_unlock;
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}
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get_device(&cdev->dev);
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ret = cmbops->alloc(cdev);
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if (ret)
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goto out;
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cmbops->reset(cdev);
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ret = sysfs_create_group(&cdev->dev.kobj, cmbops->attr_group);
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if (ret) {
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cmbops->free(cdev);
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goto out;
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}
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ret = cmbops->set(cdev, 2);
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if (ret) {
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sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group);
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cmbops->free(cdev);
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}
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out:
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if (ret)
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put_device(&cdev->dev);
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out_unlock:
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device_unlock(&cdev->dev);
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return ret;
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}
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/**
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* __disable_cmf() - switch off the channel measurement for a specific device
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* @cdev: The ccw device to be disabled
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*
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* Returns: %0 for success or a negative error value.
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*
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* Context:
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* non-atomic, device_lock() held.
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*/
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int __disable_cmf(struct ccw_device *cdev)
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{
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int ret;
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ret = cmbops->set(cdev, 0);
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if (ret)
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return ret;
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sysfs_remove_group(&cdev->dev.kobj, cmbops->attr_group);
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cmbops->free(cdev);
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put_device(&cdev->dev);
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return ret;
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}
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/**
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* disable_cmf() - switch off the channel measurement for a specific device
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* @cdev: The ccw device to be disabled
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*
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* Returns: %0 for success or a negative error value.
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*
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* Context:
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* non-atomic
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*/
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int disable_cmf(struct ccw_device *cdev)
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{
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int ret;
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device_lock(&cdev->dev);
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ret = __disable_cmf(cdev);
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device_unlock(&cdev->dev);
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return ret;
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}
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/**
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* cmf_read() - read one value from the current channel measurement block
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* @cdev: the channel to be read
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* @index: the index of the value to be read
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*
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* Returns: The value read or %0 if the value cannot be read.
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*
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* Context:
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* any
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*/
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u64 cmf_read(struct ccw_device *cdev, int index)
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{
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return cmbops->read(cdev, index);
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}
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/**
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* cmf_readall() - read the current channel measurement block
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* @cdev: the channel to be read
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* @data: a pointer to a data block that will be filled
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*
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* Returns: %0 on success, a negative error value otherwise.
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*
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* Context:
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* any
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*/
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int cmf_readall(struct ccw_device *cdev, struct cmbdata *data)
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{
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return cmbops->readall(cdev, data);
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}
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/* Reenable cmf when a disconnected device becomes available again. */
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int cmf_reenable(struct ccw_device *cdev)
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{
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cmbops->reset(cdev);
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return cmbops->set(cdev, 2);
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}
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/**
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* cmf_reactivate() - reactivate measurement block updates
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*
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* Use this during resume from hibernate.
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*/
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void cmf_reactivate(void)
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{
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spin_lock(&cmb_area.lock);
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if (!list_empty(&cmb_area.list))
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cmf_activate(cmb_area.mem, CMF_ON);
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spin_unlock(&cmb_area.lock);
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}
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static int __init init_cmbe(void)
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{
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cmbe_cache = kmem_cache_create("cmbe_cache", sizeof(struct cmbe),
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__alignof__(struct cmbe), 0, NULL);
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return cmbe_cache ? 0 : -ENOMEM;
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}
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static int __init init_cmf(void)
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{
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char *format_string;
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char *detect_string;
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int ret;
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/*
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* If the user did not give a parameter, see if we are running on a
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* machine supporting extended measurement blocks, otherwise fall back
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* to basic mode.
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*/
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if (format == CMF_AUTODETECT) {
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if (!css_general_characteristics.ext_mb) {
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format = CMF_BASIC;
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} else {
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format = CMF_EXTENDED;
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}
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detect_string = "autodetected";
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} else {
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detect_string = "parameter";
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}
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switch (format) {
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case CMF_BASIC:
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format_string = "basic";
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cmbops = &cmbops_basic;
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break;
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case CMF_EXTENDED:
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format_string = "extended";
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cmbops = &cmbops_extended;
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ret = init_cmbe();
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if (ret)
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return ret;
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break;
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default:
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return -EINVAL;
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}
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pr_info("Channel measurement facility initialized using format "
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"%s (mode %s)\n", format_string, detect_string);
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return 0;
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}
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device_initcall(init_cmf);
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EXPORT_SYMBOL_GPL(enable_cmf);
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EXPORT_SYMBOL_GPL(disable_cmf);
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EXPORT_SYMBOL_GPL(cmf_read);
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EXPORT_SYMBOL_GPL(cmf_readall);
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