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| 1 | /* |
| 2 | * common EDAC components that must be in kernel |
| 3 | * |
| 4 | * Author: Dave Jiang <djiang@mvista.com> |
| 5 | * |
| 6 | * 2007 (c) MontaVista Software, Inc. |
| 7 | * 2010 (c) Advanced Micro Devices Inc. |
| 8 | * Borislav Petkov <borislav.petkov@amd.com> |
| 9 | * |
| 10 | * This file is licensed under the terms of the GNU General Public |
| 11 | * License version 2. This program is licensed "as is" without any |
| 12 | * warranty of any kind, whether express or implied. |
| 13 | * |
| 14 | */ |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/edac.h> |
| 17 | #include <linux/atomic.h> |
| 18 | #include <linux/device.h> |
| 19 | #include <asm/edac.h> |
| 20 | |
| 21 | int edac_op_state = EDAC_OPSTATE_INVAL; |
| 22 | EXPORT_SYMBOL_GPL(edac_op_state); |
| 23 | |
| 24 | atomic_t edac_handlers = ATOMIC_INIT(0); |
| 25 | EXPORT_SYMBOL_GPL(edac_handlers); |
| 26 | |
| 27 | int edac_err_assert = 0; |
| 28 | EXPORT_SYMBOL_GPL(edac_err_assert); |
| 29 | |
| 30 | static atomic_t edac_subsys_valid = ATOMIC_INIT(0); |
| 31 | |
| 32 | /* |
| 33 | * called to determine if there is an EDAC driver interested in |
| 34 | * knowing an event (such as NMI) occurred |
| 35 | */ |
| 36 | int edac_handler_set(void) |
| 37 | { |
| 38 | if (edac_op_state == EDAC_OPSTATE_POLL) |
| 39 | return 0; |
| 40 | |
| 41 | return atomic_read(&edac_handlers); |
| 42 | } |
| 43 | EXPORT_SYMBOL_GPL(edac_handler_set); |
| 44 | |
| 45 | /* |
| 46 | * handler for NMI type of interrupts to assert error |
| 47 | */ |
| 48 | void edac_atomic_assert_error(void) |
| 49 | { |
| 50 | edac_err_assert++; |
| 51 | } |
| 52 | EXPORT_SYMBOL_GPL(edac_atomic_assert_error); |
| 53 | |
| 54 | /* |
| 55 | * sysfs object: /sys/devices/system/edac |
| 56 | * need to export to other files |
| 57 | */ |
| 58 | struct bus_type edac_subsys = { |
| 59 | .name = "edac", |
| 60 | .dev_name = "edac", |
| 61 | }; |
| 62 | EXPORT_SYMBOL_GPL(edac_subsys); |
| 63 | |
| 64 | /* return pointer to the 'edac' node in sysfs */ |
| 65 | struct bus_type *edac_get_sysfs_subsys(void) |
| 66 | { |
| 67 | int err = 0; |
| 68 | |
| 69 | if (atomic_read(&edac_subsys_valid)) |
| 70 | goto out; |
| 71 | |
| 72 | /* create the /sys/devices/system/edac directory */ |
| 73 | err = subsys_system_register(&edac_subsys, NULL); |
| 74 | if (err) { |
| 75 | printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n"); |
| 76 | return NULL; |
| 77 | } |
| 78 | |
| 79 | out: |
| 80 | atomic_inc(&edac_subsys_valid); |
| 81 | return &edac_subsys; |
| 82 | } |
| 83 | EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys); |
| 84 | |
| 85 | void edac_put_sysfs_subsys(void) |
| 86 | { |
| 87 | /* last user unregisters it */ |
| 88 | if (atomic_dec_and_test(&edac_subsys_valid)) |
| 89 | bus_unregister(&edac_subsys); |
| 90 | } |
| 91 | EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys); |
| 92 |
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