blob: 4382343a7c60ed3cc4d5d1ea4f7661c62b1fe5bc [file] [log] [blame]
Alan Cox0d88a102006-01-18 17:44:10 -08001/*
2 * Intel 82860 Memory Controller kernel module
3 * (C) 2005 Red Hat (http://www.redhat.com)
4 * This file may be distributed under the terms of the
5 * GNU General Public License.
6 *
7 * Written by Ben Woodard <woodard@redhat.com>
8 * shamelessly copied from and based upon the edac_i82875 driver
9 * by Thayne Harbaugh of Linux Networx. (http://lnxi.com)
10 */
11
Alan Cox0d88a102006-01-18 17:44:10 -080012#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/pci.h>
15#include <linux/pci_ids.h>
Hitoshi Mitakec3c52bc2008-04-29 01:03:18 -070016#include <linux/edac.h>
Douglas Thompson20bcb7a2007-07-19 01:49:47 -070017#include "edac_core.h"
Alan Cox0d88a102006-01-18 17:44:10 -080018
Michal Marek152ba392011-04-01 12:41:20 +020019#define I82860_REVISION " Ver: 2.0.2"
Doug Thompson929a40e2006-07-01 04:35:45 -070020#define EDAC_MOD_STR "i82860_edac"
Doug Thompson37f04582006-06-30 01:56:07 -070021
Dave Peterson537fba22006-03-26 01:38:40 -080022#define i82860_printk(level, fmt, arg...) \
Dave Petersone7ecd892006-03-26 01:38:52 -080023 edac_printk(level, "i82860", fmt, ##arg)
Dave Peterson537fba22006-03-26 01:38:40 -080024
25#define i82860_mc_printk(mci, level, fmt, arg...) \
Dave Petersone7ecd892006-03-26 01:38:52 -080026 edac_mc_chipset_printk(mci, level, "i82860", fmt, ##arg)
Dave Peterson537fba22006-03-26 01:38:40 -080027
Alan Cox0d88a102006-01-18 17:44:10 -080028#ifndef PCI_DEVICE_ID_INTEL_82860_0
29#define PCI_DEVICE_ID_INTEL_82860_0 0x2531
30#endif /* PCI_DEVICE_ID_INTEL_82860_0 */
31
32#define I82860_MCHCFG 0x50
33#define I82860_GBA 0x60
34#define I82860_GBA_MASK 0x7FF
35#define I82860_GBA_SHIFT 24
36#define I82860_ERRSTS 0xC8
37#define I82860_EAP 0xE4
38#define I82860_DERRCTL_STS 0xE2
39
40enum i82860_chips {
41 I82860 = 0,
42};
43
44struct i82860_dev_info {
45 const char *ctl_name;
46};
47
48struct i82860_error_info {
49 u16 errsts;
50 u32 eap;
51 u16 derrsyn;
52 u16 errsts2;
53};
54
55static const struct i82860_dev_info i82860_devs[] = {
56 [I82860] = {
Douglas Thompson052dfb42007-07-19 01:50:13 -070057 .ctl_name = "i82860"},
Alan Cox0d88a102006-01-18 17:44:10 -080058};
59
Douglas Thompsonf0440912007-07-19 01:50:19 -070060static struct pci_dev *mci_pdev; /* init dev: in case that AGP code
Dave Petersone7ecd892006-03-26 01:38:52 -080061 * has already registered driver
62 */
Dave Jiang456a2f92007-07-19 01:50:10 -070063static struct edac_pci_ctl_info *i82860_pci;
Alan Cox0d88a102006-01-18 17:44:10 -080064
Dave Petersone7ecd892006-03-26 01:38:52 -080065static void i82860_get_error_info(struct mem_ctl_info *mci,
Douglas Thompson052dfb42007-07-19 01:50:13 -070066 struct i82860_error_info *info)
Alan Cox0d88a102006-01-18 17:44:10 -080067{
Doug Thompson37f04582006-06-30 01:56:07 -070068 struct pci_dev *pdev;
69
Mauro Carvalho Chehabfd687502012-03-16 07:44:18 -030070 pdev = to_pci_dev(mci->pdev);
Doug Thompson37f04582006-06-30 01:56:07 -070071
Alan Cox0d88a102006-01-18 17:44:10 -080072 /*
73 * This is a mess because there is no atomic way to read all the
74 * registers at once and the registers can transition from CE being
75 * overwritten by UE.
76 */
Doug Thompson37f04582006-06-30 01:56:07 -070077 pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts);
78 pci_read_config_dword(pdev, I82860_EAP, &info->eap);
79 pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn);
80 pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts2);
Alan Cox0d88a102006-01-18 17:44:10 -080081
Doug Thompson37f04582006-06-30 01:56:07 -070082 pci_write_bits16(pdev, I82860_ERRSTS, 0x0003, 0x0003);
Alan Cox0d88a102006-01-18 17:44:10 -080083
84 /*
85 * If the error is the same for both reads then the first set of reads
86 * is valid. If there is a change then there is a CE no info and the
87 * second set of reads is valid and should be UE info.
88 */
89 if (!(info->errsts2 & 0x0003))
90 return;
Dave Petersone7ecd892006-03-26 01:38:52 -080091
Alan Cox0d88a102006-01-18 17:44:10 -080092 if ((info->errsts ^ info->errsts2) & 0x0003) {
Doug Thompson37f04582006-06-30 01:56:07 -070093 pci_read_config_dword(pdev, I82860_EAP, &info->eap);
Dave Jiangb4e8b372007-07-19 01:50:04 -070094 pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn);
Alan Cox0d88a102006-01-18 17:44:10 -080095 }
96}
97
Dave Petersone7ecd892006-03-26 01:38:52 -080098static int i82860_process_error_info(struct mem_ctl_info *mci,
Douglas Thompson052dfb42007-07-19 01:50:13 -070099 struct i82860_error_info *info,
100 int handle_errors)
Alan Cox0d88a102006-01-18 17:44:10 -0800101{
Mauro Carvalho Chehab84c3a682012-04-16 15:10:31 -0300102 struct dimm_info *dimm;
Alan Cox0d88a102006-01-18 17:44:10 -0800103 int row;
104
105 if (!(info->errsts2 & 0x0003))
106 return 0;
107
108 if (!handle_errors)
109 return 1;
110
111 if ((info->errsts ^ info->errsts2) & 0x0003) {
Mauro Carvalho Chehab9eb07a72012-06-04 13:27:43 -0300112 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
Mauro Carvalho Chehab03f7eae2012-06-04 11:29:25 -0300113 -1, -1, -1, "UE overwrote CE", "");
Alan Cox0d88a102006-01-18 17:44:10 -0800114 info->errsts = info->errsts2;
115 }
116
117 info->eap >>= PAGE_SHIFT;
118 row = edac_mc_find_csrow_by_page(mci, info->eap);
Mauro Carvalho Chehabde3910eb2012-04-24 15:05:43 -0300119 dimm = mci->csrows[row]->channels[0]->dimm;
Alan Cox0d88a102006-01-18 17:44:10 -0800120
121 if (info->errsts & 0x0002)
Mauro Carvalho Chehab9eb07a72012-06-04 13:27:43 -0300122 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
Mauro Carvalho Chehab84c3a682012-04-16 15:10:31 -0300123 info->eap, 0, 0,
124 dimm->location[0], dimm->location[1], -1,
Mauro Carvalho Chehab03f7eae2012-06-04 11:29:25 -0300125 "i82860 UE", "");
Alan Cox0d88a102006-01-18 17:44:10 -0800126 else
Jason Baronab0543d2014-10-15 20:47:24 +0000127 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
Mauro Carvalho Chehab84c3a682012-04-16 15:10:31 -0300128 info->eap, 0, info->derrsyn,
129 dimm->location[0], dimm->location[1], -1,
Mauro Carvalho Chehab03f7eae2012-06-04 11:29:25 -0300130 "i82860 CE", "");
Alan Cox0d88a102006-01-18 17:44:10 -0800131
132 return 1;
133}
134
135static void i82860_check(struct mem_ctl_info *mci)
136{
137 struct i82860_error_info info;
138
Joe Perches956b9ba2012-04-29 17:08:39 -0300139 edac_dbg(1, "MC%d\n", mci->mc_idx);
Alan Cox0d88a102006-01-18 17:44:10 -0800140 i82860_get_error_info(mci, &info);
141 i82860_process_error_info(mci, &info, 1);
142}
143
Doug Thompson13189522006-06-30 01:56:08 -0700144static void i82860_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev)
145{
146 unsigned long last_cumul_size;
Dave Jiangb4e8b372007-07-19 01:50:04 -0700147 u16 mchcfg_ddim; /* DRAM Data Integrity Mode 0=none, 2=edac */
Doug Thompson13189522006-06-30 01:56:08 -0700148 u16 value;
149 u32 cumul_size;
150 struct csrow_info *csrow;
Mauro Carvalho Chehab084a4fc2012-01-27 18:38:08 -0300151 struct dimm_info *dimm;
Doug Thompson13189522006-06-30 01:56:08 -0700152 int index;
153
154 pci_read_config_word(pdev, I82860_MCHCFG, &mchcfg_ddim);
155 mchcfg_ddim = mchcfg_ddim & 0x180;
156 last_cumul_size = 0;
157
158 /* The group row boundary (GRA) reg values are boundary address
159 * for each DRAM row with a granularity of 16MB. GRA regs are
160 * cumulative; therefore GRA15 will contain the total memory contained
161 * in all eight rows.
162 */
163 for (index = 0; index < mci->nr_csrows; index++) {
Mauro Carvalho Chehabde3910eb2012-04-24 15:05:43 -0300164 csrow = mci->csrows[index];
165 dimm = csrow->channels[0]->dimm;
Mauro Carvalho Chehab084a4fc2012-01-27 18:38:08 -0300166
Doug Thompson13189522006-06-30 01:56:08 -0700167 pci_read_config_word(pdev, I82860_GBA + index * 2, &value);
168 cumul_size = (value & I82860_GBA_MASK) <<
Douglas Thompson052dfb42007-07-19 01:50:13 -0700169 (I82860_GBA_SHIFT - PAGE_SHIFT);
Joe Perches956b9ba2012-04-29 17:08:39 -0300170 edac_dbg(3, "(%d) cumul_size 0x%x\n", index, cumul_size);
Doug Thompson13189522006-06-30 01:56:08 -0700171
172 if (cumul_size == last_cumul_size)
173 continue; /* not populated */
174
175 csrow->first_page = last_cumul_size;
176 csrow->last_page = cumul_size - 1;
Mauro Carvalho Chehaba895bf82012-01-28 09:09:38 -0300177 dimm->nr_pages = cumul_size - last_cumul_size;
Doug Thompson13189522006-06-30 01:56:08 -0700178 last_cumul_size = cumul_size;
Mauro Carvalho Chehab084a4fc2012-01-27 18:38:08 -0300179 dimm->grain = 1 << 12; /* I82860_EAP has 4KiB reolution */
180 dimm->mtype = MEM_RMBS;
181 dimm->dtype = DEV_UNKNOWN;
182 dimm->edac_mode = mchcfg_ddim ? EDAC_SECDED : EDAC_NONE;
Doug Thompson13189522006-06-30 01:56:08 -0700183 }
184}
185
Alan Cox0d88a102006-01-18 17:44:10 -0800186static int i82860_probe1(struct pci_dev *pdev, int dev_idx)
187{
Doug Thompson13189522006-06-30 01:56:08 -0700188 struct mem_ctl_info *mci;
Mauro Carvalho Chehab84c3a682012-04-16 15:10:31 -0300189 struct edac_mc_layer layers[2];
Dave Peterson749ede52006-03-26 01:38:45 -0800190 struct i82860_error_info discard;
Alan Cox0d88a102006-01-18 17:44:10 -0800191
Mauro Carvalho Chehab84c3a682012-04-16 15:10:31 -0300192 /*
193 * RDRAM has channels but these don't map onto the csrow abstraction.
194 * According with the datasheet, there are 2 Rambus channels, supporting
195 * up to 16 direct RDRAM devices.
196 * The device groups from the GRA registers seem to map reasonably
197 * well onto the notion of a chip select row.
198 * There are 16 GRA registers and since the name is associated with
199 * the channel and the GRA registers map to physical devices so we are
200 * going to make 1 channel for group.
Alan Cox0d88a102006-01-18 17:44:10 -0800201 */
Mauro Carvalho Chehab84c3a682012-04-16 15:10:31 -0300202 layers[0].type = EDAC_MC_LAYER_CHANNEL;
203 layers[0].size = 2;
204 layers[0].is_virt_csrow = true;
205 layers[1].type = EDAC_MC_LAYER_SLOT;
206 layers[1].size = 8;
207 layers[1].is_virt_csrow = true;
Mauro Carvalho Chehabca0907b2012-05-02 14:37:00 -0300208 mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
Alan Cox0d88a102006-01-18 17:44:10 -0800209 if (!mci)
210 return -ENOMEM;
211
Joe Perches956b9ba2012-04-29 17:08:39 -0300212 edac_dbg(3, "init mci\n");
Mauro Carvalho Chehabfd687502012-03-16 07:44:18 -0300213 mci->pdev = &pdev->dev;
Alan Cox0d88a102006-01-18 17:44:10 -0800214 mci->mtype_cap = MEM_FLAG_DDR;
Alan Cox0d88a102006-01-18 17:44:10 -0800215 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
216 /* I"m not sure about this but I think that all RDRAM is SECDED */
217 mci->edac_cap = EDAC_FLAG_SECDED;
Dave Peterson680cbbb2006-03-26 01:38:41 -0800218 mci->mod_name = EDAC_MOD_STR;
Doug Thompson37f04582006-06-30 01:56:07 -0700219 mci->mod_ver = I82860_REVISION;
Alan Cox0d88a102006-01-18 17:44:10 -0800220 mci->ctl_name = i82860_devs[dev_idx].ctl_name;
Dave Jiangc4192702007-07-19 01:49:47 -0700221 mci->dev_name = pci_name(pdev);
Alan Cox0d88a102006-01-18 17:44:10 -0800222 mci->edac_check = i82860_check;
223 mci->ctl_page_to_phys = NULL;
Doug Thompson13189522006-06-30 01:56:08 -0700224 i82860_init_csrows(mci, pdev);
Dave Jiangb4e8b372007-07-19 01:50:04 -0700225 i82860_get_error_info(mci, &discard); /* clear counters */
Alan Cox0d88a102006-01-18 17:44:10 -0800226
Doug Thompson2d7bbb92006-06-30 01:56:08 -0700227 /* Here we assume that we will never see multiple instances of this
228 * type of memory controller. The ID is therefore hardcoded to 0.
229 */
Doug Thompsonb8f6f972007-07-19 01:50:26 -0700230 if (edac_mc_add_mc(mci)) {
Joe Perches956b9ba2012-04-29 17:08:39 -0300231 edac_dbg(3, "failed edac_mc_add_mc()\n");
Doug Thompson13189522006-06-30 01:56:08 -0700232 goto fail;
Alan Cox0d88a102006-01-18 17:44:10 -0800233 }
Dave Petersone7ecd892006-03-26 01:38:52 -0800234
Dave Jiang456a2f92007-07-19 01:50:10 -0700235 /* allocating generic PCI control info */
236 i82860_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
237 if (!i82860_pci) {
238 printk(KERN_WARNING
239 "%s(): Unable to create PCI control\n",
240 __func__);
241 printk(KERN_WARNING
242 "%s(): PCI error report via EDAC not setup\n",
243 __func__);
244 }
245
Doug Thompson13189522006-06-30 01:56:08 -0700246 /* get this far and it's successful */
Joe Perches956b9ba2012-04-29 17:08:39 -0300247 edac_dbg(3, "success\n");
Doug Thompson13189522006-06-30 01:56:08 -0700248
249 return 0;
250
Douglas Thompson052dfb42007-07-19 01:50:13 -0700251fail:
Doug Thompson13189522006-06-30 01:56:08 -0700252 edac_mc_free(mci);
253 return -ENODEV;
Alan Cox0d88a102006-01-18 17:44:10 -0800254}
255
256/* returns count (>= 0), or negative on error */
Greg Kroah-Hartman9b3c6e82012-12-21 13:23:51 -0800257static int i82860_init_one(struct pci_dev *pdev,
258 const struct pci_device_id *ent)
Alan Cox0d88a102006-01-18 17:44:10 -0800259{
260 int rc;
261
Joe Perches956b9ba2012-04-29 17:08:39 -0300262 edac_dbg(0, "\n");
Dave Peterson537fba22006-03-26 01:38:40 -0800263 i82860_printk(KERN_INFO, "i82860 init one\n");
Dave Petersone7ecd892006-03-26 01:38:52 -0800264
265 if (pci_enable_device(pdev) < 0)
Alan Cox0d88a102006-01-18 17:44:10 -0800266 return -EIO;
Dave Petersone7ecd892006-03-26 01:38:52 -0800267
Alan Cox0d88a102006-01-18 17:44:10 -0800268 rc = i82860_probe1(pdev, ent->driver_data);
Dave Petersone7ecd892006-03-26 01:38:52 -0800269
270 if (rc == 0)
Alan Cox0d88a102006-01-18 17:44:10 -0800271 mci_pdev = pci_dev_get(pdev);
Dave Petersone7ecd892006-03-26 01:38:52 -0800272
Alan Cox0d88a102006-01-18 17:44:10 -0800273 return rc;
274}
275
Greg Kroah-Hartman9b3c6e82012-12-21 13:23:51 -0800276static void i82860_remove_one(struct pci_dev *pdev)
Alan Cox0d88a102006-01-18 17:44:10 -0800277{
278 struct mem_ctl_info *mci;
279
Joe Perches956b9ba2012-04-29 17:08:39 -0300280 edac_dbg(0, "\n");
Alan Cox0d88a102006-01-18 17:44:10 -0800281
Dave Jiang456a2f92007-07-19 01:50:10 -0700282 if (i82860_pci)
283 edac_pci_release_generic_ctl(i82860_pci);
284
Doug Thompson37f04582006-06-30 01:56:07 -0700285 if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
Dave Peterson18dbc332006-03-26 01:38:50 -0800286 return;
287
288 edac_mc_free(mci);
Alan Cox0d88a102006-01-18 17:44:10 -0800289}
290
Jingoo Hanba935f42013-12-06 10:23:08 +0100291static const struct pci_device_id i82860_pci_tbl[] = {
Dave Petersone7ecd892006-03-26 01:38:52 -0800292 {
Dave Jiangb4e8b372007-07-19 01:50:04 -0700293 PCI_VEND_DEV(INTEL, 82860_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
294 I82860},
Dave Petersone7ecd892006-03-26 01:38:52 -0800295 {
Dave Jiangb4e8b372007-07-19 01:50:04 -0700296 0,
297 } /* 0 terminated list. */
Alan Cox0d88a102006-01-18 17:44:10 -0800298};
299
300MODULE_DEVICE_TABLE(pci, i82860_pci_tbl);
301
302static struct pci_driver i82860_driver = {
Dave Peterson680cbbb2006-03-26 01:38:41 -0800303 .name = EDAC_MOD_STR,
Alan Cox0d88a102006-01-18 17:44:10 -0800304 .probe = i82860_init_one,
Greg Kroah-Hartman9b3c6e82012-12-21 13:23:51 -0800305 .remove = i82860_remove_one,
Alan Cox0d88a102006-01-18 17:44:10 -0800306 .id_table = i82860_pci_tbl,
307};
308
Alan Coxda9bb1d2006-01-18 17:44:13 -0800309static int __init i82860_init(void)
Alan Cox0d88a102006-01-18 17:44:10 -0800310{
311 int pci_rc;
312
Joe Perches956b9ba2012-04-29 17:08:39 -0300313 edac_dbg(3, "\n");
Dave Petersone7ecd892006-03-26 01:38:52 -0800314
Hitoshi Mitakec3c52bc2008-04-29 01:03:18 -0700315 /* Ensure that the OPSTATE is set correctly for POLL or NMI */
316 opstate_init();
317
Alan Cox0d88a102006-01-18 17:44:10 -0800318 if ((pci_rc = pci_register_driver(&i82860_driver)) < 0)
Dave Petersone8a491b2006-03-26 01:38:43 -0800319 goto fail0;
Alan Cox0d88a102006-01-18 17:44:10 -0800320
321 if (!mci_pdev) {
Alan Cox0d88a102006-01-18 17:44:10 -0800322 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700323 PCI_DEVICE_ID_INTEL_82860_0, NULL);
Dave Petersone7ecd892006-03-26 01:38:52 -0800324
Alan Cox0d88a102006-01-18 17:44:10 -0800325 if (mci_pdev == NULL) {
Joe Perches956b9ba2012-04-29 17:08:39 -0300326 edac_dbg(0, "860 pci_get_device fail\n");
Dave Petersone8a491b2006-03-26 01:38:43 -0800327 pci_rc = -ENODEV;
328 goto fail1;
Alan Cox0d88a102006-01-18 17:44:10 -0800329 }
Dave Petersone7ecd892006-03-26 01:38:52 -0800330
Alan Cox0d88a102006-01-18 17:44:10 -0800331 pci_rc = i82860_init_one(mci_pdev, i82860_pci_tbl);
Dave Petersone7ecd892006-03-26 01:38:52 -0800332
Alan Cox0d88a102006-01-18 17:44:10 -0800333 if (pci_rc < 0) {
Joe Perches956b9ba2012-04-29 17:08:39 -0300334 edac_dbg(0, "860 init fail\n");
Dave Petersone8a491b2006-03-26 01:38:43 -0800335 pci_rc = -ENODEV;
336 goto fail1;
Alan Cox0d88a102006-01-18 17:44:10 -0800337 }
338 }
Dave Petersone7ecd892006-03-26 01:38:52 -0800339
Alan Cox0d88a102006-01-18 17:44:10 -0800340 return 0;
Dave Petersone8a491b2006-03-26 01:38:43 -0800341
Douglas Thompson052dfb42007-07-19 01:50:13 -0700342fail1:
Dave Petersone8a491b2006-03-26 01:38:43 -0800343 pci_unregister_driver(&i82860_driver);
344
Douglas Thompson052dfb42007-07-19 01:50:13 -0700345fail0:
Dave Petersone8a491b2006-03-26 01:38:43 -0800346 if (mci_pdev != NULL)
347 pci_dev_put(mci_pdev);
348
349 return pci_rc;
Alan Cox0d88a102006-01-18 17:44:10 -0800350}
351
352static void __exit i82860_exit(void)
353{
Joe Perches956b9ba2012-04-29 17:08:39 -0300354 edac_dbg(3, "\n");
Alan Cox0d88a102006-01-18 17:44:10 -0800355
356 pci_unregister_driver(&i82860_driver);
Dave Petersone8a491b2006-03-26 01:38:43 -0800357
358 if (mci_pdev != NULL)
Alan Cox0d88a102006-01-18 17:44:10 -0800359 pci_dev_put(mci_pdev);
Alan Cox0d88a102006-01-18 17:44:10 -0800360}
361
362module_init(i82860_init);
363module_exit(i82860_exit);
364
365MODULE_LICENSE("GPL");
Dave Petersone7ecd892006-03-26 01:38:52 -0800366MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com) "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700367 "Ben Woodard <woodard@redhat.com>");
Alan Cox0d88a102006-01-18 17:44:10 -0800368MODULE_DESCRIPTION("ECC support for Intel 82860 memory hub controllers");
Hitoshi Mitakec3c52bc2008-04-29 01:03:18 -0700369
370module_param(edac_op_state, int, 0444);
371MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");