1/* 2 * Copyright (c) 2004 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include <linux/module.h> 30#include <linux/config.h> 31#include <linux/moduleparam.h> 32#include <linux/init.h> 33#include <linux/fs.h> 34#include <asm/uaccess.h> 35#include <linux/kernel.h> 36#include <asm/io.h> 37#include <asm/page.h> 38#include <linux/netdevice.h> 39 40#ifdef __i386__ 41#include <asm/processor.h> 42#include <asm/msr.h> 43#endif 44 45#define DRIVER_AUTHOR "Ali Saidi" 46#define DRIVER_DESC "Interface to time uncacachable read and writes to device registers" 47#define DRIVER_VER "0.1" 48 49static char *dataAddr = NULL; 50static int count = 0; 51 52static inline uint32_t cycleCounter(uint32_t dep); 53 54static int __init devtime_start(void) 55{ 56 uint64_t addr;
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57 uint32_t t1, t2;
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57 uint32_t t1, t2; |
58 uint32_t trash; 59 int x; 60 uint32_t *times; 61 uint32_t num = 0; 62 struct net_device *dev; 63
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64
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64 printk("Devtime Driver Version %s Loaded...\n", DRIVER_VER); 65
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67 if ((dataAddr != 0) && (count != 0))
68 {
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66 if (dataAddr != 0 && count != 0) { |
67 addr = simple_strtoull(dataAddr, NULL, 0); 68 69 addr = ioremap(addr, PAGE_SIZE); 70 /** 71 * Make sure that the remapping actually worked. On alpha we have 72 * linear addressing, so its not a problem. But it can fail in x86 73 * if physical memory is mapped to this address. 74 */ 75 times = kmalloc(sizeof(uint32_t) * count, GFP_USER);
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78 if (!times)
79 {
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76 if (!times) { |
77 printk("Could not allocate memory... Try again later.\n"); 78 return -1; 79 } 80
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84 if (addr)
85 {
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81 if (addr) { |
82 printk("Preparing to read %#llx %d times.\n", addr, count); 83 84 t1 = cycleCounter(trash);
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89 for (x=0; x < count; x++)
90 {
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85 for (x = 0; x < count; x++) { |
86 trash = readl(addr); 87 t2 = cycleCounter(trash); 88 times[num++] = t2 - t1; 89 t1 = t2; 90 } 91 92 /** 93 * Unmap the address. 94 */ 95 iounmap(addr); 96 97 printk("Measurements:\n");
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103 for (x = 0; x < count; x++)
104 {
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98 for (x = 0; x < count; x++) { |
99 printk("%d ", times[x]);
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106 if (((x+1) % 10) == 0)
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100 if (((x + 1) % 10) == 0) |
101 printk("\n"); 102 } 103 printk("\nDone.\n");
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110
111
112 }
113 else
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104 } else { |
105 printk("Unable to remap address. Please try again later.\n");
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106 } |
107 } else { 108 dev = dev_get_by_name("eth0");
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117 if (dev)
118 {
119 printk("Eth0: MemStart: %#lx MemEnd: %#lx I/O Addr: %#lx\n", dev->mem_start,
120 dev->mem_end, dev->base_addr);
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109 if (dev) { 110 printk("Eth0: MemStart: %#lx MemEnd: %#lx I/O Addr: %#lx\n", 111 dev->mem_start, dev->mem_end, dev->base_addr); |
112 dev_put(dev); 113 } 114 dev = 0; 115 dev = dev_get_by_name("eth1");
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125 if (dev)
126 {
127 printk("Eth1: MemStart: %#lx MemEnd: %#lx I/O Addr: %#lx\n", dev->mem_start,
128 dev->mem_end, dev->base_addr);
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116 if (dev) { 117 printk("Eth1: MemStart: %#lx MemEnd: %#lx I/O Addr: %#lx\n", 118 dev->mem_start, dev->mem_end, dev->base_addr); |
119 dev_put(dev); 120 } 121
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132
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122 printk("Required information not supplied.\n"); 123 } 124 125 return 0; 126} 127 128#ifdef __i386__ 129 130static inline uint32_t cycleCounter(uint32_t dep) 131{ 132 uint32_t time; 133 cpuid_eax(0); 134 rdtscl(time); 135 cpuid_eax(0); 136 return time; 137} 138 139#elif __alpha__ 140 141inline uint32_t cycleCounter(uint32_t dep) 142{ 143 uint32_t res; 144 asm volatile ("rpcc %0, %1" : "=r"(res) : "r" (dep) : "memory"); 145 return res; 146} 147#else 148#error Architecture NOT SUPPORTE 149#endif 150
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162static void __exit devtime_end(void) {
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151static void __exit devtime_end(void) 152{ |
153 printk("Devtime Driver Version %s Unloaded...\n", DRIVER_VER); 154} 155 156 157module_init(devtime_start); 158module_exit(devtime_end); 159 160MODULE_LICENSE("Dual BSD/GPL"); 161MODULE_AUTHOR(DRIVER_AUTHOR); 162MODULE_DESCRIPTION(DRIVER_DESC); 163module_param(dataAddr, charp, 0); 164module_param(count, int, 0);
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