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

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.
+
+