| /* |
| * GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * 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 version 2 for more details (a copy is included |
| * in the LICENSE file that accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see |
| * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| * |
| * Copyright (c) 2012, Intel Corporation. |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| */ |
| |
| #define DEBUG_SUBSYSTEM S_LNET |
| #define LUSTRE_TRACEFILE_PRIVATE |
| |
| #include "../../../include/linux/libcfs/libcfs.h" |
| #include "../tracefile.h" |
| |
| /* percents to share the total debug memory for each type */ |
| static unsigned int pages_factor[CFS_TCD_TYPE_MAX] = { |
| 80, /* 80% pages for CFS_TCD_TYPE_PROC */ |
| 10, /* 10% pages for CFS_TCD_TYPE_SOFTIRQ */ |
| 10 /* 10% pages for CFS_TCD_TYPE_IRQ */ |
| }; |
| |
| char *cfs_trace_console_buffers[NR_CPUS][CFS_TCD_TYPE_MAX]; |
| |
| static DECLARE_RWSEM(cfs_tracefile_sem); |
| |
| int cfs_tracefile_init_arch(void) |
| { |
| int i; |
| int j; |
| struct cfs_trace_cpu_data *tcd; |
| |
| /* initialize trace_data */ |
| memset(cfs_trace_data, 0, sizeof(cfs_trace_data)); |
| for (i = 0; i < CFS_TCD_TYPE_MAX; i++) { |
| cfs_trace_data[i] = |
| kmalloc(sizeof(union cfs_trace_data_union) * |
| num_possible_cpus(), GFP_KERNEL); |
| if (!cfs_trace_data[i]) |
| goto out; |
| } |
| |
| /* arch related info initialized */ |
| cfs_tcd_for_each(tcd, i, j) { |
| spin_lock_init(&tcd->tcd_lock); |
| tcd->tcd_pages_factor = pages_factor[i]; |
| tcd->tcd_type = i; |
| tcd->tcd_cpu = j; |
| } |
| |
| for (i = 0; i < num_possible_cpus(); i++) |
| for (j = 0; j < 3; j++) { |
| cfs_trace_console_buffers[i][j] = |
| kmalloc(CFS_TRACE_CONSOLE_BUFFER_SIZE, |
| GFP_KERNEL); |
| |
| if (!cfs_trace_console_buffers[i][j]) |
| goto out; |
| } |
| |
| return 0; |
| |
| out: |
| cfs_tracefile_fini_arch(); |
| printk(KERN_ERR "lnet: Not enough memory\n"); |
| return -ENOMEM; |
| } |
| |
| void cfs_tracefile_fini_arch(void) |
| { |
| int i; |
| int j; |
| |
| for (i = 0; i < num_possible_cpus(); i++) |
| for (j = 0; j < 3; j++) { |
| kfree(cfs_trace_console_buffers[i][j]); |
| cfs_trace_console_buffers[i][j] = NULL; |
| } |
| |
| for (i = 0; cfs_trace_data[i]; i++) { |
| kfree(cfs_trace_data[i]); |
| cfs_trace_data[i] = NULL; |
| } |
| } |
| |
| void cfs_tracefile_read_lock(void) |
| { |
| down_read(&cfs_tracefile_sem); |
| } |
| |
| void cfs_tracefile_read_unlock(void) |
| { |
| up_read(&cfs_tracefile_sem); |
| } |
| |
| void cfs_tracefile_write_lock(void) |
| { |
| down_write(&cfs_tracefile_sem); |
| } |
| |
| void cfs_tracefile_write_unlock(void) |
| { |
| up_write(&cfs_tracefile_sem); |
| } |
| |
| enum cfs_trace_buf_type cfs_trace_buf_idx_get(void) |
| { |
| if (in_irq()) |
| return CFS_TCD_TYPE_IRQ; |
| if (in_softirq()) |
| return CFS_TCD_TYPE_SOFTIRQ; |
| return CFS_TCD_TYPE_PROC; |
| } |
| |
| /* |
| * The walking argument indicates the locking comes from all tcd types |
| * iterator and we must lock it and dissable local irqs to avoid deadlocks |
| * with other interrupt locks that might be happening. See LU-1311 |
| * for details. |
| */ |
| int cfs_trace_lock_tcd(struct cfs_trace_cpu_data *tcd, int walking) |
| __acquires(&tcd->tc_lock) |
| { |
| __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX); |
| if (tcd->tcd_type == CFS_TCD_TYPE_IRQ) |
| spin_lock_irqsave(&tcd->tcd_lock, tcd->tcd_lock_flags); |
| else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ) |
| spin_lock_bh(&tcd->tcd_lock); |
| else if (unlikely(walking)) |
| spin_lock_irq(&tcd->tcd_lock); |
| else |
| spin_lock(&tcd->tcd_lock); |
| return 1; |
| } |
| |
| void cfs_trace_unlock_tcd(struct cfs_trace_cpu_data *tcd, int walking) |
| __releases(&tcd->tcd_lock) |
| { |
| __LASSERT(tcd->tcd_type < CFS_TCD_TYPE_MAX); |
| if (tcd->tcd_type == CFS_TCD_TYPE_IRQ) |
| spin_unlock_irqrestore(&tcd->tcd_lock, tcd->tcd_lock_flags); |
| else if (tcd->tcd_type == CFS_TCD_TYPE_SOFTIRQ) |
| spin_unlock_bh(&tcd->tcd_lock); |
| else if (unlikely(walking)) |
| spin_unlock_irq(&tcd->tcd_lock); |
| else |
| spin_unlock(&tcd->tcd_lock); |
| } |
| |
| void |
| cfs_set_ptldebug_header(struct ptldebug_header *header, |
| struct libcfs_debug_msg_data *msgdata, |
| unsigned long stack) |
| { |
| struct timespec64 ts; |
| |
| ktime_get_real_ts64(&ts); |
| |
| header->ph_subsys = msgdata->msg_subsys; |
| header->ph_mask = msgdata->msg_mask; |
| header->ph_cpu_id = smp_processor_id(); |
| header->ph_type = cfs_trace_buf_idx_get(); |
| /* y2038 safe since all user space treats this as unsigned, but |
| * will overflow in 2106 |
| */ |
| header->ph_sec = (u32)ts.tv_sec; |
| header->ph_usec = ts.tv_nsec / NSEC_PER_USEC; |
| header->ph_stack = stack; |
| header->ph_pid = current->pid; |
| header->ph_line_num = msgdata->msg_line; |
| header->ph_extern_pid = 0; |
| } |
| |
| static char * |
| dbghdr_to_err_string(struct ptldebug_header *hdr) |
| { |
| switch (hdr->ph_subsys) { |
| case S_LND: |
| case S_LNET: |
| return "LNetError"; |
| default: |
| return "LustreError"; |
| } |
| } |
| |
| static char * |
| dbghdr_to_info_string(struct ptldebug_header *hdr) |
| { |
| switch (hdr->ph_subsys) { |
| case S_LND: |
| case S_LNET: |
| return "LNet"; |
| default: |
| return "Lustre"; |
| } |
| } |
| |
| void cfs_print_to_console(struct ptldebug_header *hdr, int mask, |
| const char *buf, int len, const char *file, |
| const char *fn) |
| { |
| char *prefix = "Lustre", *ptype = NULL; |
| |
| if ((mask & D_EMERG) != 0) { |
| prefix = dbghdr_to_err_string(hdr); |
| ptype = KERN_EMERG; |
| } else if ((mask & D_ERROR) != 0) { |
| prefix = dbghdr_to_err_string(hdr); |
| ptype = KERN_ERR; |
| } else if ((mask & D_WARNING) != 0) { |
| prefix = dbghdr_to_info_string(hdr); |
| ptype = KERN_WARNING; |
| } else if ((mask & (D_CONSOLE | libcfs_printk)) != 0) { |
| prefix = dbghdr_to_info_string(hdr); |
| ptype = KERN_INFO; |
| } |
| |
| if ((mask & D_CONSOLE) != 0) { |
| printk("%s%s: %.*s", ptype, prefix, len, buf); |
| } else { |
| printk("%s%s: %d:%d:(%s:%d:%s()) %.*s", ptype, prefix, |
| hdr->ph_pid, hdr->ph_extern_pid, file, hdr->ph_line_num, |
| fn, len, buf); |
| } |
| } |
| |
| int cfs_trace_max_debug_mb(void) |
| { |
| int total_mb = (totalram_pages >> (20 - PAGE_SHIFT)); |
| |
| return max(512, (total_mb * 80) / 100); |
| } |