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1 /*
2  * Intel E3-1200
3  * Copyright (C) 2014 Jason Baron <jbaron@akamai.com>
4  *
5  * Support for the E3-1200 processor family. Heavily based on previous
6  * Intel EDAC drivers.
7  *
8  * Since the DRAM controller is on the cpu chip, we can use its PCI device
9  * id to identify these processors.
10  *
11  * PCI DRAM controller device ids (Taken from The PCI ID Repository - http://pci-ids.ucw.cz/)
12  *
13  * 0108: Xeon E3-1200 Processor Family DRAM Controller
14  * 010c: Xeon E3-1200/2nd Generation Core Processor Family DRAM Controller
15  * 0150: Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller
16  * 0158: Xeon E3-1200 v2/Ivy Bridge DRAM Controller
17  * 015c: Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller
18  * 0c04: Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller
19  * 0c08: Xeon E3-1200 v3 Processor DRAM Controller
20  *
21  * Based on Intel specification:
22  * http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/xeon-e3-1200v3-vol-2-datasheet.pdf
23  * http://www.intel.com/content/www/us/en/processors/xeon/xeon-e3-1200-family-vol-2-datasheet.html
24  *
25  * According to the above datasheet (p.16):
26  * "
27  * 6. Software must not access B0/D0/F0 32-bit memory-mapped registers with
28  * requests that cross a DW boundary.
29  * "
30  *
31  * Thus, we make use of the explicit: lo_hi_readq(), which breaks the readq into
32  * 2 readl() calls. This restriction may be lifted in subsequent chip releases,
33  * but lo_hi_readq() ensures that we are safe across all e3-1200 processors.
34  */
35
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/pci.h>
39 #include <linux/pci_ids.h>
40 #include <linux/edac.h>
41
42 #include <linux/io-64-nonatomic-lo-hi.h>
43 #include "edac_core.h"
44
45 #define IE31200_REVISION "1.0"
46 #define EDAC_MOD_STR "ie31200_edac"
47
48 #define ie31200_printk(level, fmt, arg...) \
49         edac_printk(level, "ie31200", fmt, ##arg)
50
51 #define PCI_DEVICE_ID_INTEL_IE31200_HB_1 0x0108
52 #define PCI_DEVICE_ID_INTEL_IE31200_HB_2 0x010c
53 #define PCI_DEVICE_ID_INTEL_IE31200_HB_3 0x0150
54 #define PCI_DEVICE_ID_INTEL_IE31200_HB_4 0x0158
55 #define PCI_DEVICE_ID_INTEL_IE31200_HB_5 0x015c
56 #define PCI_DEVICE_ID_INTEL_IE31200_HB_6 0x0c04
57 #define PCI_DEVICE_ID_INTEL_IE31200_HB_7 0x0c08
58
59 #define IE31200_DIMMS                   4
60 #define IE31200_RANKS                   8
61 #define IE31200_RANKS_PER_CHANNEL       4
62 #define IE31200_DIMMS_PER_CHANNEL       2
63 #define IE31200_CHANNELS                2
64
65 /* Intel IE31200 register addresses - device 0 function 0 - DRAM Controller */
66 #define IE31200_MCHBAR_LOW              0x48
67 #define IE31200_MCHBAR_HIGH             0x4c
68 #define IE31200_MCHBAR_MASK             GENMASK_ULL(38, 15)
69 #define IE31200_MMR_WINDOW_SIZE         BIT(15)
70
71 /*
72  * Error Status Register (16b)
73  *
74  * 15    reserved
75  * 14    Isochronous TBWRR Run Behind FIFO Full
76  *       (ITCV)
77  * 13    Isochronous TBWRR Run Behind FIFO Put
78  *       (ITSTV)
79  * 12    reserved
80  * 11    MCH Thermal Sensor Event
81  *       for SMI/SCI/SERR (GTSE)
82  * 10    reserved
83  *  9    LOCK to non-DRAM Memory Flag (LCKF)
84  *  8    reserved
85  *  7    DRAM Throttle Flag (DTF)
86  *  6:2  reserved
87  *  1    Multi-bit DRAM ECC Error Flag (DMERR)
88  *  0    Single-bit DRAM ECC Error Flag (DSERR)
89  */
90 #define IE31200_ERRSTS                  0xc8
91 #define IE31200_ERRSTS_UE               BIT(1)
92 #define IE31200_ERRSTS_CE               BIT(0)
93 #define IE31200_ERRSTS_BITS             (IE31200_ERRSTS_UE | IE31200_ERRSTS_CE)
94
95 /*
96  * Channel 0 ECC Error Log (64b)
97  *
98  * 63:48 Error Column Address (ERRCOL)
99  * 47:32 Error Row Address (ERRROW)
100  * 31:29 Error Bank Address (ERRBANK)
101  * 28:27 Error Rank Address (ERRRANK)
102  * 26:24 reserved
103  * 23:16 Error Syndrome (ERRSYND)
104  * 15: 2 reserved
105  *    1  Multiple Bit Error Status (MERRSTS)
106  *    0  Correctable Error Status (CERRSTS)
107  */
108 #define IE31200_C0ECCERRLOG                     0x40c8
109 #define IE31200_C1ECCERRLOG                     0x44c8
110 #define IE31200_ECCERRLOG_CE                    BIT(0)
111 #define IE31200_ECCERRLOG_UE                    BIT(1)
112 #define IE31200_ECCERRLOG_RANK_BITS             GENMASK_ULL(28, 27)
113 #define IE31200_ECCERRLOG_RANK_SHIFT            27
114 #define IE31200_ECCERRLOG_SYNDROME_BITS         GENMASK_ULL(23, 16)
115 #define IE31200_ECCERRLOG_SYNDROME_SHIFT        16
116
117 #define IE31200_ECCERRLOG_SYNDROME(log)            \
118         ((log & IE31200_ECCERRLOG_SYNDROME_BITS) >> \
119          IE31200_ECCERRLOG_SYNDROME_SHIFT)
120
121 #define IE31200_CAPID0                  0xe4
122 #define IE31200_CAPID0_PDCD             BIT(4)
123 #define IE31200_CAPID0_DDPCD            BIT(6)
124 #define IE31200_CAPID0_ECC              BIT(1)
125
126 #define IE31200_MAD_DIMM_0_OFFSET       0x5004
127 #define IE31200_MAD_DIMM_SIZE           GENMASK_ULL(7, 0)
128 #define IE31200_MAD_DIMM_A_RANK         BIT(17)
129 #define IE31200_MAD_DIMM_A_WIDTH        BIT(19)
130
131 #define IE31200_PAGES(n)                (n << (28 - PAGE_SHIFT))
132
133 static int nr_channels;
134
135 struct ie31200_priv {
136         void __iomem *window;
137 };
138
139 enum ie31200_chips {
140         IE31200 = 0,
141 };
142
143 struct ie31200_dev_info {
144         const char *ctl_name;
145 };
146
147 struct ie31200_error_info {
148         u16 errsts;
149         u16 errsts2;
150         u64 eccerrlog[IE31200_CHANNELS];
151 };
152
153 static const struct ie31200_dev_info ie31200_devs[] = {
154         [IE31200] = {
155                 .ctl_name = "IE31200"
156         },
157 };
158
159 struct dimm_data {
160         u8 size; /* in 256MB multiples */
161         u8 dual_rank : 1,
162            x16_width : 1; /* 0 means x8 width */
163 };
164
165 static int how_many_channels(struct pci_dev *pdev)
166 {
167         int n_channels;
168         unsigned char capid0_2b; /* 2nd byte of CAPID0 */
169
170         pci_read_config_byte(pdev, IE31200_CAPID0 + 1, &capid0_2b);
171
172         /* check PDCD: Dual Channel Disable */
173         if (capid0_2b & IE31200_CAPID0_PDCD) {
174                 edac_dbg(0, "In single channel mode\n");
175                 n_channels = 1;
176         } else {
177                 edac_dbg(0, "In dual channel mode\n");
178                 n_channels = 2;
179         }
180
181         /* check DDPCD - check if both channels are filled */
182         if (capid0_2b & IE31200_CAPID0_DDPCD)
183                 edac_dbg(0, "2 DIMMS per channel disabled\n");
184         else
185                 edac_dbg(0, "2 DIMMS per channel enabled\n");
186
187         return n_channels;
188 }
189
190 static bool ecc_capable(struct pci_dev *pdev)
191 {
192         unsigned char capid0_4b; /* 4th byte of CAPID0 */
193
194         pci_read_config_byte(pdev, IE31200_CAPID0 + 3, &capid0_4b);
195         if (capid0_4b & IE31200_CAPID0_ECC)
196                 return false;
197         return true;
198 }
199
200 static int eccerrlog_row(int channel, u64 log)
201 {
202         int rank = ((log & IE31200_ECCERRLOG_RANK_BITS) >>
203                 IE31200_ECCERRLOG_RANK_SHIFT);
204         return rank | (channel * IE31200_RANKS_PER_CHANNEL);
205 }
206
207 static void ie31200_clear_error_info(struct mem_ctl_info *mci)
208 {
209         /*
210          * Clear any error bits.
211          * (Yes, we really clear bits by writing 1 to them.)
212          */
213         pci_write_bits16(to_pci_dev(mci->pdev), IE31200_ERRSTS,
214                          IE31200_ERRSTS_BITS, IE31200_ERRSTS_BITS);
215 }
216
217 static void ie31200_get_and_clear_error_info(struct mem_ctl_info *mci,
218                                              struct ie31200_error_info *info)
219 {
220         struct pci_dev *pdev;
221         struct ie31200_priv *priv = mci->pvt_info;
222         void __iomem *window = priv->window;
223
224         pdev = to_pci_dev(mci->pdev);
225
226         /*
227          * This is a mess because there is no atomic way to read all the
228          * registers at once and the registers can transition from CE being
229          * overwritten by UE.
230          */
231         pci_read_config_word(pdev, IE31200_ERRSTS, &info->errsts);
232         if (!(info->errsts & IE31200_ERRSTS_BITS))
233                 return;
234
235         info->eccerrlog[0] = lo_hi_readq(window + IE31200_C0ECCERRLOG);
236         if (nr_channels == 2)
237                 info->eccerrlog[1] = lo_hi_readq(window + IE31200_C1ECCERRLOG);
238
239         pci_read_config_word(pdev, IE31200_ERRSTS, &info->errsts2);
240
241         /*
242          * If the error is the same for both reads then the first set
243          * of reads is valid.  If there is a change then there is a CE
244          * with no info and the second set of reads is valid and
245          * should be UE info.
246          */
247         if ((info->errsts ^ info->errsts2) & IE31200_ERRSTS_BITS) {
248                 info->eccerrlog[0] = lo_hi_readq(window + IE31200_C0ECCERRLOG);
249                 if (nr_channels == 2)
250                         info->eccerrlog[1] =
251                                 lo_hi_readq(window + IE31200_C1ECCERRLOG);
252         }
253
254         ie31200_clear_error_info(mci);
255 }
256
257 static void ie31200_process_error_info(struct mem_ctl_info *mci,
258                                        struct ie31200_error_info *info)
259 {
260         int channel;
261         u64 log;
262
263         if (!(info->errsts & IE31200_ERRSTS_BITS))
264                 return;
265
266         if ((info->errsts ^ info->errsts2) & IE31200_ERRSTS_BITS) {
267                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
268                                      -1, -1, -1, "UE overwrote CE", "");
269                 info->errsts = info->errsts2;
270         }
271
272         for (channel = 0; channel < nr_channels; channel++) {
273                 log = info->eccerrlog[channel];
274                 if (log & IE31200_ECCERRLOG_UE) {
275                         edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
276                                              0, 0, 0,
277                                              eccerrlog_row(channel, log),
278                                              channel, -1,
279                                              "ie31200 UE", "");
280                 } else if (log & IE31200_ECCERRLOG_CE) {
281                         edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
282                                              0, 0,
283                                              IE31200_ECCERRLOG_SYNDROME(log),
284                                              eccerrlog_row(channel, log),
285                                              channel, -1,
286                                              "ie31200 CE", "");
287                 }
288         }
289 }
290
291 static void ie31200_check(struct mem_ctl_info *mci)
292 {
293         struct ie31200_error_info info;
294
295         edac_dbg(1, "MC%d\n", mci->mc_idx);
296         ie31200_get_and_clear_error_info(mci, &info);
297         ie31200_process_error_info(mci, &info);
298 }
299
300 static void __iomem *ie31200_map_mchbar(struct pci_dev *pdev)
301 {
302         union {
303                 u64 mchbar;
304                 struct {
305                         u32 mchbar_low;
306                         u32 mchbar_high;
307                 };
308         } u;
309         void __iomem *window;
310
311         pci_read_config_dword(pdev, IE31200_MCHBAR_LOW, &u.mchbar_low);
312         pci_read_config_dword(pdev, IE31200_MCHBAR_HIGH, &u.mchbar_high);
313         u.mchbar &= IE31200_MCHBAR_MASK;
314
315         if (u.mchbar != (resource_size_t)u.mchbar) {
316                 ie31200_printk(KERN_ERR, "mmio space beyond accessible range (0x%llx)\n",
317                                (unsigned long long)u.mchbar);
318                 return NULL;
319         }
320
321         window = ioremap_nocache(u.mchbar, IE31200_MMR_WINDOW_SIZE);
322         if (!window)
323                 ie31200_printk(KERN_ERR, "Cannot map mmio space at 0x%llx\n",
324                                (unsigned long long)u.mchbar);
325
326         return window;
327 }
328
329 static int ie31200_probe1(struct pci_dev *pdev, int dev_idx)
330 {
331         int i, j, ret;
332         struct mem_ctl_info *mci = NULL;
333         struct edac_mc_layer layers[2];
334         struct dimm_data dimm_info[IE31200_CHANNELS][IE31200_DIMMS_PER_CHANNEL];
335         void __iomem *window;
336         struct ie31200_priv *priv;
337         u32 addr_decode;
338
339         edac_dbg(0, "MC:\n");
340
341         if (!ecc_capable(pdev)) {
342                 ie31200_printk(KERN_INFO, "No ECC support\n");
343                 return -ENODEV;
344         }
345
346         nr_channels = how_many_channels(pdev);
347         layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
348         layers[0].size = IE31200_DIMMS;
349         layers[0].is_virt_csrow = true;
350         layers[1].type = EDAC_MC_LAYER_CHANNEL;
351         layers[1].size = nr_channels;
352         layers[1].is_virt_csrow = false;
353         mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
354                             sizeof(struct ie31200_priv));
355         if (!mci)
356                 return -ENOMEM;
357
358         window = ie31200_map_mchbar(pdev);
359         if (!window) {
360                 ret = -ENODEV;
361                 goto fail_free;
362         }
363
364         edac_dbg(3, "MC: init mci\n");
365         mci->pdev = &pdev->dev;
366         mci->mtype_cap = MEM_FLAG_DDR3;
367         mci->edac_ctl_cap = EDAC_FLAG_SECDED;
368         mci->edac_cap = EDAC_FLAG_SECDED;
369         mci->mod_name = EDAC_MOD_STR;
370         mci->mod_ver = IE31200_REVISION;
371         mci->ctl_name = ie31200_devs[dev_idx].ctl_name;
372         mci->dev_name = pci_name(pdev);
373         mci->edac_check = ie31200_check;
374         mci->ctl_page_to_phys = NULL;
375         priv = mci->pvt_info;
376         priv->window = window;
377
378         /* populate DIMM info */
379         for (i = 0; i < IE31200_CHANNELS; i++) {
380                 addr_decode = readl(window + IE31200_MAD_DIMM_0_OFFSET +
381                                         (i * 4));
382                 edac_dbg(0, "addr_decode: 0x%x\n", addr_decode);
383                 for (j = 0; j < IE31200_DIMMS_PER_CHANNEL; j++) {
384                         dimm_info[i][j].size = (addr_decode >> (j * 8)) &
385                                                 IE31200_MAD_DIMM_SIZE;
386                         dimm_info[i][j].dual_rank = (addr_decode &
387                                 (IE31200_MAD_DIMM_A_RANK << j)) ? 1 : 0;
388                         dimm_info[i][j].x16_width = (addr_decode &
389                                 (IE31200_MAD_DIMM_A_WIDTH << j)) ? 1 : 0;
390                         edac_dbg(0, "size: 0x%x, rank: %d, width: %d\n",
391                                  dimm_info[i][j].size,
392                                  dimm_info[i][j].dual_rank,
393                                  dimm_info[i][j].x16_width);
394                 }
395         }
396
397         /*
398          * The dram rank boundary (DRB) reg values are boundary addresses
399          * for each DRAM rank with a granularity of 64MB.  DRB regs are
400          * cumulative; the last one will contain the total memory
401          * contained in all ranks.
402          */
403         for (i = 0; i < IE31200_DIMMS_PER_CHANNEL; i++) {
404                 for (j = 0; j < IE31200_CHANNELS; j++) {
405                         struct dimm_info *dimm;
406                         unsigned long nr_pages;
407
408                         nr_pages = IE31200_PAGES(dimm_info[j][i].size);
409                         if (nr_pages == 0)
410                                 continue;
411
412                         if (dimm_info[j][i].dual_rank) {
413                                 nr_pages = nr_pages / 2;
414                                 dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
415                                                      mci->n_layers, (i * 2) + 1,
416                                                      j, 0);
417                                 dimm->nr_pages = nr_pages;
418                                 edac_dbg(0, "set nr pages: 0x%lx\n", nr_pages);
419                                 dimm->grain = 8; /* just a guess */
420                                 dimm->mtype = MEM_DDR3;
421                                 dimm->dtype = DEV_UNKNOWN;
422                                 dimm->edac_mode = EDAC_UNKNOWN;
423                         }
424                         dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
425                                              mci->n_layers, i * 2, j, 0);
426                         dimm->nr_pages = nr_pages;
427                         edac_dbg(0, "set nr pages: 0x%lx\n", nr_pages);
428                         dimm->grain = 8; /* same guess */
429                         dimm->mtype = MEM_DDR3;
430                         dimm->dtype = DEV_UNKNOWN;
431                         dimm->edac_mode = EDAC_UNKNOWN;
432                 }
433         }
434
435         ie31200_clear_error_info(mci);
436
437         if (edac_mc_add_mc(mci)) {
438                 edac_dbg(3, "MC: failed edac_mc_add_mc()\n");
439                 ret = -ENODEV;
440                 goto fail_unmap;
441         }
442
443         /* get this far and it's successful */
444         edac_dbg(3, "MC: success\n");
445         return 0;
446
447 fail_unmap:
448         iounmap(window);
449
450 fail_free:
451         edac_mc_free(mci);
452
453         return ret;
454 }
455
456 static int ie31200_init_one(struct pci_dev *pdev,
457                             const struct pci_device_id *ent)
458 {
459         edac_dbg(0, "MC:\n");
460
461         if (pci_enable_device(pdev) < 0)
462                 return -EIO;
463
464         return ie31200_probe1(pdev, ent->driver_data);
465 }
466
467 static void ie31200_remove_one(struct pci_dev *pdev)
468 {
469         struct mem_ctl_info *mci;
470         struct ie31200_priv *priv;
471
472         edac_dbg(0, "\n");
473         mci = edac_mc_del_mc(&pdev->dev);
474         if (!mci)
475                 return;
476         priv = mci->pvt_info;
477         iounmap(priv->window);
478         edac_mc_free(mci);
479 }
480
481 static const struct pci_device_id ie31200_pci_tbl[] = {
482         {
483                 PCI_VEND_DEV(INTEL, IE31200_HB_1), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
484                 IE31200},
485         {
486                 PCI_VEND_DEV(INTEL, IE31200_HB_2), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
487                 IE31200},
488         {
489                 PCI_VEND_DEV(INTEL, IE31200_HB_3), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
490                 IE31200},
491         {
492                 PCI_VEND_DEV(INTEL, IE31200_HB_4), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
493                 IE31200},
494         {
495                 PCI_VEND_DEV(INTEL, IE31200_HB_5), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
496                 IE31200},
497         {
498                 PCI_VEND_DEV(INTEL, IE31200_HB_6), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
499                 IE31200},
500         {
501                 PCI_VEND_DEV(INTEL, IE31200_HB_7), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
502                 IE31200},
503         {
504                 0,
505         }            /* 0 terminated list. */
506 };
507 MODULE_DEVICE_TABLE(pci, ie31200_pci_tbl);
508
509 static struct pci_driver ie31200_driver = {
510         .name = EDAC_MOD_STR,
511         .probe = ie31200_init_one,
512         .remove = ie31200_remove_one,
513         .id_table = ie31200_pci_tbl,
514 };
515
516 static int __init ie31200_init(void)
517 {
518         edac_dbg(3, "MC:\n");
519         /* Ensure that the OPSTATE is set correctly for POLL or NMI */
520         opstate_init();
521
522         return pci_register_driver(&ie31200_driver);
523 }
524
525 static void __exit ie31200_exit(void)
526 {
527         edac_dbg(3, "MC:\n");
528         pci_unregister_driver(&ie31200_driver);
529 }
530
531 module_init(ie31200_init);
532 module_exit(ie31200_exit);
533
534 MODULE_LICENSE("GPL");
535 MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>");
536 MODULE_DESCRIPTION("MC support for Intel Processor E31200 memory hub controllers");