| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/kernel/pmu.c |
| 3 | * |
| 4 | * Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles |
| 5 | * Copyright (C) 2010 ARM Ltd, Will Deacon |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <linux/err.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/module.h> |
| 16 | |
| 17 | #include <asm/pmu.h> |
| 18 | |
| 19 | /* |
| 20 | * PMU locking to ensure mutual exclusion between different subsystems. |
| 21 | */ |
| 22 | static unsigned long pmu_lock[BITS_TO_LONGS(ARM_NUM_PMU_DEVICES)]; |
| 23 | |
| 24 | int |
| 25 | reserve_pmu(enum arm_pmu_type type) |
| 26 | { |
| 27 | return test_and_set_bit_lock(type, pmu_lock) ? -EBUSY : 0; |
| 28 | } |
| 29 | EXPORT_SYMBOL_GPL(reserve_pmu); |
| 30 | |
| 31 | void |
| 32 | release_pmu(enum arm_pmu_type type) |
| 33 | { |
| 34 | clear_bit_unlock(type, pmu_lock); |
| 35 | } |
| 36 | EXPORT_SYMBOL_GPL(release_pmu); |