From 6bcb68e07ca630e59cc40b89096e930a64cd4d16 Mon Sep 17 00:00:00 2001 From: Gabe Black Date: Tue, 16 Feb 2021 00:21:03 -0800 Subject: [PATCH] util: Delete the ccdrv kernel module. This very small kernel module seems to be intended to measure the access time to device registers when running in a linux kernel. It mentions kernel version 2.6.x and so is fairly old and may not work with modern kernels. While there is probably some utility (no pun intended) to having a driver like that and that sort of measurement capability, the usefulness is probably not huge compared to its small but non-zero maintenance burden. It seems like it's not something that gets active attention given it's revision history, and is probably just taking up space these days. Change-Id: I3b1f44d718d7e6ee23695e3117bb169268f2157a Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/41473 Reviewed-by: Andreas Sandberg Reviewed-by: Jason Lowe-Power Maintainer: Jason Lowe-Power Tested-by: kokoro --- util/ccdrv/Makefile | 27 ------ util/ccdrv/devtime.c | 195 ------------------------------------------ util/ccdrv/readme.txt | 18 ---- 3 files changed, 240 deletions(-) delete mode 100644 util/ccdrv/Makefile delete mode 100644 util/ccdrv/devtime.c delete mode 100644 util/ccdrv/readme.txt diff --git a/util/ccdrv/Makefile b/util/ccdrv/Makefile deleted file mode 100644 index bf6700e4f1..0000000000 --- a/util/ccdrv/Makefile +++ /dev/null @@ -1,27 +0,0 @@ -# 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. - -obj-m := devtime.o diff --git a/util/ccdrv/devtime.c b/util/ccdrv/devtime.c deleted file mode 100644 index 22192371b8..0000000000 --- a/util/ccdrv/devtime.c +++ /dev/null @@ -1,195 +0,0 @@ -/* - * 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#ifdef __i386__ -#include -#include -#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 char *dataAddr = NULL; -static int count = 0; -#ifdef __alpha__ -static int memTest = 0; -#endif - -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; - uint32_t *times; - uint32_t num = 0; - struct net_device *dev; - - printk("Devtime Driver Version %s Loaded...\n", DRIVER_VER); - -#ifdef __alpha__ - if (memTest) { - addr = 0xfffffc0000000000; -// addr += 16*1024*1024; - - printk("Preparing memory test.\n"); - - t1 = cycleCounter(trash); - for (x = 0; x < count; x++) { - trash = readl(addr); - t2 = cycleCounter(trash); - times[num++] = t2 - t1; - t1 = t2; - addr += 4096; - } - - printk("Measurements:\n"); - for (x = 0; x < count; x++) { - printk("%d ", times[x]); - if (((x + 1) % 10) == 0) - printk("\n"); - } - printk("\nDone.\n"); - } else -#endif - if (dataAddr != 0 && count != 0) { - addr = simple_strtoull(dataAddr, NULL, 0); - - addr = ioremap(addr, PAGE_SIZE); - /** - * Make sure that the remapping actually worked. On alpha we have - * linear addressing, so its not a problem. But it can fail in x86 - * if physical memory is mapped to this address. - */ - times = kmalloc(sizeof(uint32_t) * count, GFP_USER); - if (!times) { - printk("Could not allocate memory... Try again later.\n"); - return -1; - } - - if (addr) { - 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); - times[num++] = t2 - t1; - t1 = t2; - } - - /** - * Unmap the address. - */ - iounmap(addr); - - printk("Measurements:\n"); - for (x = 0; x < count; x++) { - printk("%d ", times[x]); - if (((x + 1) % 10) == 0) - printk("\n"); - } - printk("\nDone.\n"); - } else { - printk("Unable to remap address. Please try again later.\n"); - } - } 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 = 0; - 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 SUPPORTED -#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("Dual BSD/GPL"); -MODULE_AUTHOR(DRIVER_AUTHOR); -MODULE_DESCRIPTION(DRIVER_DESC); -module_param(dataAddr, charp, 0); -module_param(count, int, 0); -#ifdef __alpha__ -module_param(memTest, int, 0); -#endif diff --git a/util/ccdrv/readme.txt b/util/ccdrv/readme.txt deleted file mode 100644 index 4b9892f692..0000000000 --- a/util/ccdrv/readme.txt +++ /dev/null @@ -1,18 +0,0 @@ -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. - -