diff options
| -rw-r--r-- | util/ccdrv/Makefile | 29 | ||||
| -rw-r--r-- | util/ccdrv/devtime.c | 143 | ||||
| -rw-r--r-- | util/ccdrv/readme.txt | 18 |
3 files changed, 190 insertions, 0 deletions
diff --git a/util/ccdrv/Makefile b/util/ccdrv/Makefile new file mode 100644 index 000000000..123333533 --- /dev/null +++ b/util/ccdrv/Makefile @@ -0,0 +1,29 @@ +# Copyright (c) 2004 The Regents of The University of Michigan +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are +# met: redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer; +# redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution; +# neither the name of the copyright holders nor the names of its +# contributors may be used to endorse or promote products derived from +# this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +# +# Authors: Ali Saidi + +obj-m := devtime.o diff --git a/util/ccdrv/devtime.c b/util/ccdrv/devtime.c new file mode 100644 index 000000000..e637116a4 --- /dev/null +++ b/util/ccdrv/devtime.c @@ -0,0 +1,143 @@ +/* + * Copyright (c) 2004 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <linux/module.h> +#include <linux/config.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/fs.h> +#include <asm/uaccess.h> +#include <linux/kernel.h> +#include <asm/io.h> +#include <linux/netdevice.h> + +#ifdef __i386__ +#include <asm/processor.h> +#include <asm/msr.h> +#endif + +#define DRIVER_AUTHOR "Ali Saidi" +#define DRIVER_DESC "Interface to time uncacachable read and writes to device registers" +#define DRIVER_VER "0.1" + +static unsigned long devCnt, devSum, devSsq; +static char *dataAddr = NULL; +static int count = 0; + +static inline uint32_t cycleCounter(uint32_t dep); + +static int __init devtime_start(void) +{ + uint64_t addr; + uint32_t t1, t2; + uint32_t trash; + int x; + + struct net_device *dev; + + + printk("Devtime Driver Version %s Loaded...\n", DRIVER_VER); + + if ((dataAddr != 0) && (count != 0)) + { + addr = simple_strtoull(dataAddr, NULL, 0); + + devSum = 0; + devCnt = count; + + printk("Preparing to read %#llx %d times.\n", addr, count); + + t1 = cycleCounter(trash); + for (x=0; x < count; x++) + { + trash = readl(addr); + t2 = cycleCounter(trash); + devSum += t2 - t1; + t1 = t2; + } + + printk("Read Address %#llx %ld times. Average latency %ld.\n", addr, devCnt, devSum/devCnt); + } else { + dev = dev_get_by_name("eth0"); + if (dev) + { + printk("Eth0: MemStart: %#lx MemEnd: %#lx I/O Addr: %#lx\n", dev->mem_start, + dev->mem_end, dev->base_addr); + dev_put(dev); + } + dev = dev_get_by_name("eth1"); + if (dev) + { + printk("Eth1: MemStart: %#lx MemEnd: %#lx I/O Addr: %#lx\n", dev->mem_start, + dev->mem_end, dev->base_addr); + dev_put(dev); + } + + + printk("Required information not supplied.\n"); + } + + return 0; +} + +#ifdef __i386__ + +static inline uint32_t cycleCounter(uint32_t dep) +{ + uint32_t time; + cpuid_eax(0); + rdtscl(time); + cpuid_eax(0); + return time; +} + +#elif __alpha__ + +inline uint32_t cycleCounter(uint32_t dep) +{ + uint32_t res; + asm volatile ("rpcc %0, %1" : "=r"(res) : "r" (dep) : "memory"); + return res; +} +#else +#error Architecture NOT SUPPORTE +#endif + +static void __exit devtime_end(void) { + printk("Devtime Driver Version %s Unloaded...\n", DRIVER_VER); +} + + +module_init(devtime_start); +module_exit(devtime_end); + +MODULE_LICENSE("BSD"); +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +module_param(dataAddr, charp, 0); +module_param(count, int, 0); diff --git a/util/ccdrv/readme.txt b/util/ccdrv/readme.txt new file mode 100644 index 000000000..4b9892f69 --- /dev/null +++ b/util/ccdrv/readme.txt @@ -0,0 +1,18 @@ +This driver will read the address you point it to [count] times and +print the results to the systemlog. + +To build the driver (Linux 2.6.X only) execute: +make -C /path/to/linux-2.6.X/ SUBDIRS=$PWD modules + + +Insmodding the kernel module without options will print +the device addresses of eth0 and eth1 if they exist. + +Insmodding the kernel module with the options: +dataAddr=0xXXXXXXXXX and count=XXXXX + +will read a long at addr dataAddr count times and return. + +Between runs you need to rmmod the module from the kernel. + + |