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 <andreas.sandberg@arm.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
This commit is contained in:
Gabe Black
@@ -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
|
||||
@@ -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 <asm/io.h>
|
||||
#include <asm/page.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <linux/config.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/moduleparam.h>
|
||||
#include <linux/netdevice.h>
|
||||
|
||||
#ifdef __i386__
|
||||
#include <asm/msr.h>
|
||||
#include <asm/processor.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 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
|
||||
@@ -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.
|
||||
|
||||
|
||||
Reference in New Issue
Block a user