Added code to read any location in memory a repetative number of and
average the results. It works on alpha but I haven't got it working on x86 I think for lack of knowing a good address to read. --HG-- extra : convert_revision : e2442de641741674d692245712aa92e258cf6d48
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Ali Saidi
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3 changed files with 190 additions and 0 deletions
29
util/ccdrv/Makefile
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29
util/ccdrv/Makefile
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# Copyright (c) 2004 The Regents of The University of Michigan
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Ali Saidi
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obj-m := devtime.o
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143
util/ccdrv/devtime.c
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util/ccdrv/devtime.c
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/*
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* Copyright (c) 2004 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/module.h>
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#include <linux/config.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <asm/uaccess.h>
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#include <linux/kernel.h>
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#include <asm/io.h>
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#include <linux/netdevice.h>
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#ifdef __i386__
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#include <asm/processor.h>
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#include <asm/msr.h>
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#endif
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#define DRIVER_AUTHOR "Ali Saidi"
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#define DRIVER_DESC "Interface to time uncacachable read and writes to device registers"
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#define DRIVER_VER "0.1"
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static unsigned long devCnt, devSum, devSsq;
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static char *dataAddr = NULL;
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static int count = 0;
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static inline uint32_t cycleCounter(uint32_t dep);
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static int __init devtime_start(void)
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{
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uint64_t addr;
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uint32_t t1, t2;
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uint32_t trash;
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int x;
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struct net_device *dev;
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printk("Devtime Driver Version %s Loaded...\n", DRIVER_VER);
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if ((dataAddr != 0) && (count != 0))
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{
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addr = simple_strtoull(dataAddr, NULL, 0);
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devSum = 0;
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devCnt = count;
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printk("Preparing to read %#llx %d times.\n", addr, count);
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t1 = cycleCounter(trash);
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for (x=0; x < count; x++)
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{
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trash = readl(addr);
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t2 = cycleCounter(trash);
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devSum += t2 - t1;
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t1 = t2;
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}
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printk("Read Address %#llx %ld times. Average latency %ld.\n", addr, devCnt, devSum/devCnt);
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} else {
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dev = dev_get_by_name("eth0");
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if (dev)
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{
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printk("Eth0: MemStart: %#lx MemEnd: %#lx I/O Addr: %#lx\n", dev->mem_start,
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dev->mem_end, dev->base_addr);
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dev_put(dev);
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}
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dev = dev_get_by_name("eth1");
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if (dev)
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{
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printk("Eth1: MemStart: %#lx MemEnd: %#lx I/O Addr: %#lx\n", dev->mem_start,
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dev->mem_end, dev->base_addr);
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dev_put(dev);
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}
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printk("Required information not supplied.\n");
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}
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return 0;
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}
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#ifdef __i386__
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static inline uint32_t cycleCounter(uint32_t dep)
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{
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uint32_t time;
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cpuid_eax(0);
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rdtscl(time);
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cpuid_eax(0);
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return time;
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}
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#elif __alpha__
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inline uint32_t cycleCounter(uint32_t dep)
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{
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uint32_t res;
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asm volatile ("rpcc %0, %1" : "=r"(res) : "r" (dep) : "memory");
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return res;
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}
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#else
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#error Architecture NOT SUPPORTE
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#endif
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static void __exit devtime_end(void) {
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printk("Devtime Driver Version %s Unloaded...\n", DRIVER_VER);
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}
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module_init(devtime_start);
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module_exit(devtime_end);
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MODULE_LICENSE("BSD");
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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module_param(dataAddr, charp, 0);
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module_param(count, int, 0);
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18
util/ccdrv/readme.txt
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18
util/ccdrv/readme.txt
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This driver will read the address you point it to [count] times and
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print the results to the systemlog.
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To build the driver (Linux 2.6.X only) execute:
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make -C /path/to/linux-2.6.X/ SUBDIRS=$PWD modules
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Insmodding the kernel module without options will print
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the device addresses of eth0 and eth1 if they exist.
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Insmodding the kernel module with the options:
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dataAddr=0xXXXXXXXXX and count=XXXXX
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will read a long at addr dataAddr count times and return.
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Between runs you need to rmmod the module from the kernel.
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