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/*****************************************************************************\
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
* For details, see <http://zfsonlinux.org/>.
*
* The SPL 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; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL 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.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
\*****************************************************************************/
#ifndef _SPL_TRACE_H
#define _SPL_TRACE_H
#define TCD_MAX_PAGES (5 << (20 - PAGE_SHIFT))
#define TCD_STOCK_PAGES (TCD_MAX_PAGES)
#define TRACE_CONSOLE_BUFFER_SIZE 1024
#define SPL_DEFAULT_MAX_DELAY (600 * HZ)
#define SPL_DEFAULT_MIN_DELAY ((HZ + 1) / 2)
#define SPL_DEFAULT_BACKOFF 2
#define DL_NOTHREAD 0x0001 /* Do not create a new thread */
#define DL_SINGLE_CPU 0x0002 /* Collect pages from this CPU*/
typedef struct dumplog_priv {
wait_queue_head_t dp_waitq;
pid_t dp_pid;
int dp_flags;
atomic_t dp_done;
} dumplog_priv_t;
/* Three trace data types */
typedef enum {
TCD_TYPE_PROC,
TCD_TYPE_SOFTIRQ,
TCD_TYPE_IRQ,
TCD_TYPE_MAX
} tcd_type_t;
union trace_data_union {
struct trace_cpu_data {
/* pages with trace records not yet processed by tracefiled */
struct list_head tcd_pages;
/* number of pages on ->tcd_pages */
unsigned long tcd_cur_pages;
/* Max number of pages allowed on ->tcd_pages */
unsigned long tcd_max_pages;
/*
* preallocated pages to write trace records into. Pages from
* ->tcd_stock_pages are moved to ->tcd_pages by spl_debug_msg().
*
* This list is necessary, because on some platforms it's
* impossible to perform efficient atomic page allocation in a
* non-blockable context.
*
* Such platforms fill ->tcd_stock_pages "on occasion", when
* tracing code is entered in blockable context.
*
* trace_get_tage_try() tries to get a page from
* ->tcd_stock_pages first and resorts to atomic page
* allocation only if this queue is empty. ->tcd_stock_pages
* is replenished when tracing code is entered in blocking
* context (darwin-tracefile.c:trace_get_tcd()). We try to
* maintain TCD_STOCK_PAGES (40 by default) pages in this
* queue. Atomic allocation is only required if more than
* TCD_STOCK_PAGES pagesful are consumed by trace records all
* emitted in non-blocking contexts. Which is quite unlikely.
*/
struct list_head tcd_stock_pages;
/* number of pages on ->tcd_stock_pages */
unsigned long tcd_cur_stock_pages;
unsigned short tcd_shutting_down;
unsigned short tcd_cpu;
unsigned short tcd_type;
/* The factors to share debug memory. */
unsigned short tcd_pages_factor;
/*
* This spinlock is needed to workaround the problem of
* set_cpus_allowed() being GPL-only. Since we cannot
* schedule a thread on a specific CPU when dumping the
* pages, we must use the spinlock for mutual exclusion.
*/
spinlock_t tcd_lock;
unsigned long tcd_lock_flags;
} tcd;
char __pad[L1_CACHE_ALIGN(sizeof(struct trace_cpu_data))];
};
extern union trace_data_union (*trace_data[TCD_TYPE_MAX])[NR_CPUS];
#define tcd_for_each(tcd, i, j) \
for (i = 0; i < TCD_TYPE_MAX && trace_data[i]; i++) \
for (j = 0, ((tcd) = &(*trace_data[i])[j].tcd); \
j < num_possible_cpus(); j++, (tcd) = &(*trace_data[i])[j].tcd)
#define tcd_for_each_type_lock(tcd, i, cpu) \
for (i = 0; i < TCD_TYPE_MAX && trace_data[i] && \
(tcd = &(*trace_data[i])[cpu].tcd) && \
trace_lock_tcd(tcd); trace_unlock_tcd(tcd), i++)
struct trace_page {
struct page *page; /* page itself */
struct list_head linkage; /* Used by trace_data_union */
unsigned int used; /* number of bytes used within this page */
unsigned short cpu; /* cpu that owns this page */
unsigned short type; /* type(context) of this page */
};
struct page_collection {
struct list_head pc_pages;
spinlock_t pc_lock;
int pc_want_daemon_pages;
};
#endif /* SPL_TRACE_H */
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