| 1 | /* |
| 2 | * wrapper/irqdesc.c |
| 3 | * |
| 4 | * wrapper around irq_to_desc. Using KALLSYMS to get its address when |
| 5 | * available, else we need to have a kernel that exports this function to GPL |
| 6 | * modules. This export was added to the 3.4 kernels. |
| 7 | * |
| 8 | * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 9 | * |
| 10 | * This library is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU Lesser General Public |
| 12 | * License as published by the Free Software Foundation; only |
| 13 | * version 2.1 of the License. |
| 14 | * |
| 15 | * This library is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * Lesser General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Lesser General Public |
| 21 | * License along with this library; if not, write to the Free Software |
| 22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 23 | */ |
| 24 | |
| 25 | #include <lttng-kernel-version.h> |
| 26 | |
| 27 | #if (defined(CONFIG_KALLSYMS) \ |
| 28 | && (LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(3,4,0))) |
| 29 | |
| 30 | #include <linux/kallsyms.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/irqnr.h> |
| 33 | #include <wrapper/kallsyms.h> |
| 34 | #include <wrapper/irqdesc.h> |
| 35 | |
| 36 | static |
| 37 | struct irq_desc *(*irq_to_desc_sym)(unsigned int irq); |
| 38 | |
| 39 | struct irq_desc *wrapper_irq_to_desc(unsigned int irq) |
| 40 | { |
| 41 | if (!irq_to_desc_sym) |
| 42 | irq_to_desc_sym = (void *) kallsyms_lookup_funcptr("irq_to_desc"); |
| 43 | if (irq_to_desc_sym) { |
| 44 | return irq_to_desc_sym(irq); |
| 45 | } else { |
| 46 | printk_once(KERN_WARNING "LTTng: irq_to_desc symbol lookup failed.\n"); |
| 47 | return NULL; |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | #else |
| 52 | |
| 53 | #include <linux/interrupt.h> |
| 54 | #include <linux/irqnr.h> |
| 55 | |
| 56 | struct irq_desc *wrapper_irq_to_desc(unsigned int irq) |
| 57 | { |
| 58 | return irq_to_desc(irq); |
| 59 | } |
| 60 | |
| 61 | #endif |