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Message-ID: <4BC46C62.7050400@vlnb.net>
Date: Tue, 13 Apr 2010 17:06:42 +0400
From: Vladislav Bolkhovitin <vst@...b.net>
To: linux-scsi@...r.kernel.org
CC: linux-kernel@...r.kernel.org,
scst-devel <scst-devel@...ts.sourceforge.net>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Andrew Morton <akpm@...ux-foundation.org>,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Mike Christie <michaelc@...wisc.edu>,
Jeff Garzik <jeff@...zik.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Vu Pham <vuhuong@...lanox.com>,
Bart Van Assche <bart.vanassche@...il.com>,
James Smart <James.Smart@...lex.Com>,
Joe Eykholt <jeykholt@...co.com>, Andy Yan <ayan@...vell.com>,
linux-driver@...gic.com
Subject: Re: [PATCH][RFC 9/12/1/5] SCST debugging support
This patch contains SCST debugging support routines.
Signed-off-by: Vladislav Bolkhovitin <vst@...b.net>
---
drivers/scst/scst_debug.c | 136 ++++++++++++++++++++++
include/scst/scst_debug.h | 276 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 412 insertions(+)
diff -uprN orig/linux-2.6.33/include/scst/scst_debug.h linux-2.6.33/include/scst/scst_debug.h
--- orig/linux-2.6.33/include/scst/scst_debug.h
+++ linux-2.6.33/include/scst/scst_debug.h
@@ -0,0 +1,276 @@
+/*
+ * include/scst_debug.h
+ *
+ * Copyright (C) 2004 - 2010 Vladislav Bolkhovitin <vst@...b.net>
+ * Copyright (C) 2004 - 2005 Leonid Stoljar
+ * Copyright (C) 2007 - 2010 ID7 Ltd.
+ *
+ * Contains macroses for execution tracing and error reporting
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2
+ * of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __SCST_DEBUG_H
+#define __SCST_DEBUG_H
+
+#include <generated/autoconf.h> /* for CONFIG_* */
+
+#include <linux/bug.h> /* for WARN_ON_ONCE */
+
+#ifdef CONFIG_SCST_EXTRACHECKS
+#define EXTRACHECKS_BUG_ON(a) BUG_ON(a)
+#define EXTRACHECKS_WARN_ON(a) WARN_ON(a)
+#define EXTRACHECKS_WARN_ON_ONCE(a) WARN_ON_ONCE(a)
+#else
+#define EXTRACHECKS_BUG_ON(a) do { } while (0)
+#define EXTRACHECKS_WARN_ON(a) do { } while (0)
+#define EXTRACHECKS_WARN_ON_ONCE(a) do { } while (0)
+#endif
+
+#define TRACE_NULL 0x00000000
+#define TRACE_DEBUG 0x00000001
+#define TRACE_FUNCTION 0x00000002
+#define TRACE_LINE 0x00000004
+#define TRACE_PID 0x00000008
+#define TRACE_BUFF 0x00000020
+#define TRACE_MEMORY 0x00000040
+#define TRACE_SG_OP 0x00000080
+#define TRACE_OUT_OF_MEM 0x00000100
+#define TRACE_MINOR 0x00000200 /* less important events */
+#define TRACE_MGMT 0x00000400
+#define TRACE_MGMT_DEBUG 0x00000800
+#define TRACE_SCSI 0x00001000
+#define TRACE_SPECIAL 0x00002000 /* filtering debug, etc */
+#define TRACE_FLOW_CONTROL 0x00004000 /* flow control in action */
+#define TRACE_ALL 0xffffffff
+/* Flags 0xXXXX0000 are local for users */
+
+#define TRACE_MINOR_AND_MGMT_DBG (TRACE_MINOR|TRACE_MGMT_DEBUG)
+
+#ifndef KERN_CONT
+#define KERN_CONT ""
+#endif
+
+/*
+ * Note: in the next two printk() statements the KERN_CONT macro is only
+ * present to suppress a checkpatch warning (KERN_CONT is defined as "").
+ */
+#define PRINT(log_flag, format, args...) \
+ printk(log_flag format "\n", ## args)
+#define PRINTN(log_flag, format, args...) \
+ printk(log_flag format, ## args)
+
+#ifdef LOG_PREFIX
+#define __LOG_PREFIX LOG_PREFIX
+#else
+#define __LOG_PREFIX NULL
+#endif
+
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+
+#ifndef CONFIG_SCST_DEBUG
+#define ___unlikely(a) (a)
+#else
+#define ___unlikely(a) unlikely(a)
+#endif
+
+/*
+ * We don't print prefix for debug traces to not put additional preasure
+ * on the logging system in case of a lot of logging.
+ */
+
+extern int debug_print_prefix(unsigned long trace_flag,
+ const char *prefix, const char *func, int line);
+extern void debug_print_buffer(const void *data, int len);
+
+#define TRACE(trace, format, args...) \
+do { \
+ if (___unlikely(trace_flag & (trace))) { \
+ debug_print_prefix(trace_flag, __LOG_PREFIX, \
+ __func__, __LINE__); \
+ PRINT(KERN_CONT, format, args); \
+ } \
+} while (0)
+
+#ifdef CONFIG_SCST_DEBUG
+
+#define PRINT_BUFFER(message, buff, len) \
+do { \
+ PRINT(KERN_INFO, "%s:%s:", __func__, message); \
+ debug_print_buffer(buff, len); \
+} while (0)
+
+#else
+
+#define PRINT_BUFFER(message, buff, len) \
+do { \
+ PRINT(KERN_INFO, "%s:", message); \
+ debug_print_buffer(buff, len); \
+} while (0)
+
+#endif
+
+#define PRINT_BUFF_FLAG(flag, message, buff, len) \
+do { \
+ if (___unlikely(trace_flag & (flag))) { \
+ debug_print_prefix(trace_flag, NULL, __func__, __LINE__);\
+ PRINT(KERN_CONT, "%s:", message); \
+ debug_print_buffer(buff, len); \
+ } \
+} while (0)
+
+#else /* CONFIG_SCST_DEBUG || CONFIG_SCST_TRACING */
+
+#define TRACE(trace, args...) do {} while (0)
+#define PRINT_BUFFER(message, buff, len) do {} while (0)
+#define PRINT_BUFF_FLAG(flag, message, buff, len) do {} while (0)
+
+#endif /* CONFIG_SCST_DEBUG || CONFIG_SCST_TRACING */
+
+#ifdef CONFIG_SCST_DEBUG
+
+#define TRACE_DBG_FLAG(trace, format, args...) \
+do { \
+ if (trace_flag & (trace)) { \
+ debug_print_prefix(trace_flag, NULL, __func__, __LINE__);\
+ PRINT(KERN_CONT, format, args); \
+ } \
+} while (0)
+
+#define TRACE_MEM(args...) TRACE_DBG_FLAG(TRACE_MEMORY, args)
+#define TRACE_SG(args...) TRACE_DBG_FLAG(TRACE_SG_OP, args)
+#define TRACE_DBG(args...) TRACE_DBG_FLAG(TRACE_DEBUG, args)
+#define TRACE_DBG_SPECIAL(args...) TRACE_DBG_FLAG(TRACE_DEBUG|TRACE_SPECIAL, args)
+#define TRACE_MGMT_DBG(args...) TRACE_DBG_FLAG(TRACE_MGMT_DEBUG, args)
+#define TRACE_MGMT_DBG_SPECIAL(args...) \
+ TRACE_DBG_FLAG(TRACE_MGMT_DEBUG|TRACE_SPECIAL, args)
+
+#define TRACE_BUFFER(message, buff, len) \
+do { \
+ if (trace_flag & TRACE_BUFF) { \
+ debug_print_prefix(trace_flag, NULL, __func__, __LINE__);\
+ PRINT(KERN_CONT, "%s:", message); \
+ debug_print_buffer(buff, len); \
+ } \
+} while (0)
+
+#define TRACE_BUFF_FLAG(flag, message, buff, len) \
+do { \
+ if (trace_flag & (flag)) { \
+ debug_print_prefix(trace_flag, NULL, __func__, __LINE__);\
+ PRINT(KERN_CONT, "%s:", message); \
+ debug_print_buffer(buff, len); \
+ } \
+} while (0)
+
+#define PRINT_LOG_FLAG(log_flag, format, args...) \
+do { \
+ debug_print_prefix(trace_flag, __LOG_PREFIX, __func__, __LINE__);\
+ PRINT(KERN_CONT, format, args); \
+} while (0)
+
+#define PRINT_WARNING(format, args...) \
+do { \
+ debug_print_prefix(trace_flag, __LOG_PREFIX, __func__, __LINE__);\
+ PRINT(KERN_CONT, "***WARNING***: " format, args); \
+} while (0)
+
+#define PRINT_ERROR(format, args...) \
+do { \
+ debug_print_prefix(trace_flag, __LOG_PREFIX, __func__, __LINE__);\
+ PRINT(KERN_CONT, "***ERROR***: " format, args); \
+} while (0)
+
+#define PRINT_CRIT_ERROR(format, args...) \
+do { \
+ debug_print_prefix(trace_flag, __LOG_PREFIX, __func__, __LINE__);\
+ PRINT(KERN_CONT, "***CRITICAL ERROR***: " format, args); \
+} while (0)
+
+#define PRINT_INFO(format, args...) \
+do { \
+ debug_print_prefix(trace_flag, __LOG_PREFIX, __func__, __LINE__);\
+ PRINT(KERN_CONT, format, args); \
+} while (0)
+
+#else /* CONFIG_SCST_DEBUG */
+
+#define TRACE_MEM(format, args...) do {} while (0)
+#define TRACE_SG(format, args...) do {} while (0)
+#define TRACE_DBG(format, args...) do {} while (0)
+#define TRACE_DBG_FLAG(format, args...) do {} while (0)
+#define TRACE_DBG_SPECIAL(format, args...) do {} while (0)
+#define TRACE_MGMT_DBG(format, args...) do {} while (0)
+#define TRACE_MGMT_DBG_SPECIAL(format, args...) do {} while (0)
+#define TRACE_BUFFER(message, buff, len) do {} while (0)
+#define TRACE_BUFF_FLAG(flag, message, buff, len) do {} while (0)
+
+#ifdef LOG_PREFIX
+
+#define PRINT_INFO(format, args...) \
+do { \
+ PRINT(KERN_INFO, "%s: " format, LOG_PREFIX, args); \
+} while (0)
+
+#define PRINT_WARNING(format, args...) \
+do { \
+ PRINT(KERN_INFO, "%s: ***WARNING***: " \
+ format, LOG_PREFIX, args); \
+} while (0)
+
+#define PRINT_ERROR(format, args...) \
+do { \
+ PRINT(KERN_INFO, "%s: ***ERROR***: " \
+ format, LOG_PREFIX, args); \
+} while (0)
+
+#define PRINT_CRIT_ERROR(format, args...) \
+do { \
+ PRINT(KERN_INFO, "%s: ***CRITICAL ERROR***: " \
+ format, LOG_PREFIX, args); \
+} while (0)
+
+#else
+
+#define PRINT_INFO(format, args...) \
+do { \
+ PRINT(KERN_INFO, format, args); \
+} while (0)
+
+#define PRINT_WARNING(format, args...) \
+do { \
+ PRINT(KERN_INFO, "***WARNING***: " \
+ format, args); \
+} while (0)
+
+#define PRINT_ERROR(format, args...) \
+do { \
+ PRINT(KERN_ERR, "***ERROR***: " \
+ format, args); \
+} while (0)
+
+#define PRINT_CRIT_ERROR(format, args...) \
+do { \
+ PRINT(KERN_CRIT, "***CRITICAL ERROR***: " \
+ format, args); \
+} while (0)
+
+#endif /* LOG_PREFIX */
+
+#endif /* CONFIG_SCST_DEBUG */
+
+#if defined(CONFIG_SCST_DEBUG) && defined(CONFIG_DEBUG_SLAB)
+#define SCST_SLAB_FLAGS (SLAB_RED_ZONE | SLAB_POISON)
+#else
+#define SCST_SLAB_FLAGS 0L
+#endif
+
+#endif /* __SCST_DEBUG_H */
diff -uprN orig/linux-2.6.33/drivers/scst/scst_debug.c linux-2.6.33/drivers/scst/scst_debug.c
--- orig/linux-2.6.33/drivers/scst/scst_debug.c
+++ linux-2.6.33/drivers/scst/scst_debug.c
@@ -0,0 +1,136 @@
+/*
+ * scst_debug.c
+ *
+ * Copyright (C) 2004 - 2010 Vladislav Bolkhovitin <vst@...b.net>
+ * Copyright (C) 2004 - 2005 Leonid Stoljar
+ * Copyright (C) 2007 - 2010 ID7 Ltd.
+ *
+ * Contains helper functions for execution tracing and error reporting.
+ * Intended to be included in main .c file.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2
+ * of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include "scst.h"
+#include "scst_debug.h"
+
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+
+#define TRACE_BUF_SIZE 512
+
+static char trace_buf[TRACE_BUF_SIZE];
+static DEFINE_SPINLOCK(trace_buf_lock);
+
+static inline int get_current_tid(void)
+{
+ /* Code should be the same as in sys_gettid() */
+ if (in_interrupt()) {
+ /*
+ * Unfortunately, task_pid_vnr() isn't IRQ-safe, so otherwise
+ * it can oops. ToDo.
+ */
+ return 0;
+ }
+ return task_pid_vnr(current);
+}
+
+/**
+ * debug_print_prefix() - print debug prefix for a log line
+ *
+ * Prints, if requested by trace_flag, debug prefix for each log line
+ */
+int debug_print_prefix(unsigned long trace_flag,
+ const char *prefix, const char *func, int line)
+{
+ int i = 0;
+ unsigned long flags;
+ int pid = get_current_tid();
+
+ spin_lock_irqsave(&trace_buf_lock, flags);
+
+ trace_buf[0] = '\0';
+
+ if (trace_flag & TRACE_PID)
+ i += snprintf(&trace_buf[i], TRACE_BUF_SIZE, "[%d]: ", pid);
+ if (prefix != NULL)
+ i += snprintf(&trace_buf[i], TRACE_BUF_SIZE - i, "%s: ",
+ prefix);
+ if (trace_flag & TRACE_FUNCTION)
+ i += snprintf(&trace_buf[i], TRACE_BUF_SIZE - i, "%s:", func);
+ if (trace_flag & TRACE_LINE)
+ i += snprintf(&trace_buf[i], TRACE_BUF_SIZE - i, "%i:", line);
+
+ PRINTN(KERN_INFO, "%s", trace_buf);
+
+ spin_unlock_irqrestore(&trace_buf_lock, flags);
+
+ return i;
+}
+EXPORT_SYMBOL(debug_print_prefix);
+
+/**
+ * debug_print_buffer() - print a buffer
+ *
+ * Prints in the log data from the buffer
+ */
+void debug_print_buffer(const void *data, int len)
+{
+ int z, z1, i;
+ const unsigned char *buf = (const unsigned char *) data;
+ unsigned long flags;
+
+ if (buf == NULL)
+ return;
+
+ spin_lock_irqsave(&trace_buf_lock, flags);
+
+ PRINT(KERN_INFO, " (h)___0__1__2__3__4__5__6__7__8__9__A__B__C__D__E__F");
+ for (z = 0, z1 = 0, i = 0; z < len; z++) {
+ if (z % 16 == 0) {
+ if (z != 0) {
+ i += snprintf(&trace_buf[i], TRACE_BUF_SIZE - i,
+ " ");
+ for (; (z1 < z) && (i < TRACE_BUF_SIZE - 1);
+ z1++) {
+ if ((buf[z1] >= 0x20) &&
+ (buf[z1] < 0x80))
+ trace_buf[i++] = buf[z1];
+ else
+ trace_buf[i++] = '.';
+ }
+ trace_buf[i] = '\0';
+ PRINT(KERN_INFO, "%s", trace_buf);
+ i = 0;
+ }
+ i += snprintf(&trace_buf[i], TRACE_BUF_SIZE - i,
+ "%4x: ", z);
+ }
+ i += snprintf(&trace_buf[i], TRACE_BUF_SIZE - i, "%02x ",
+ buf[z]);
+ }
+
+ i += snprintf(&trace_buf[i], TRACE_BUF_SIZE - i, " ");
+ for (; (z1 < z) && (i < TRACE_BUF_SIZE - 1); z1++) {
+ if ((buf[z1] > 0x20) && (buf[z1] < 0x80))
+ trace_buf[i++] = buf[z1];
+ else
+ trace_buf[i++] = '.';
+ }
+ trace_buf[i] = '\0';
+
+ PRINT(KERN_INFO, "%s", trace_buf);
+
+ spin_unlock_irqrestore(&trace_buf_lock, flags);
+ return;
+}
+EXPORT_SYMBOL(debug_print_buffer);
+
+#endif /* CONFIG_SCST_DEBUG || CONFIG_SCST_TRACING */
--
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