3 * (C) 2003 Linux Networx (http://lnxi.com)
4 * This file may be distributed under the terms of the
5 * GNU General Public License.
7 * Written by Thayne Harbaugh
8 * Based on work by Dan Hollis <goemon at anime dot net> and others.
9 * http://www.anime.net/~goemon/linux-ecc/
11 * NMI handling support added by
12 * Dave Peterson <dsp@llnl.gov> <dave_peterson@pobox.com>
14 * $Id: edac_mc.h,v 1.4.2.10 2005/10/05 00:43:44 dsp_llnl Exp $
23 #include <linux/config.h>
24 #include <linux/kernel.h>
25 #include <linux/types.h>
26 #include <linux/module.h>
27 #include <linux/spinlock.h>
28 #include <linux/smp.h>
29 #include <linux/pci.h>
30 #include <linux/time.h>
31 #include <linux/nmi.h>
32 #include <linux/rcupdate.h>
33 #include <linux/completion.h>
34 #include <linux/kobject.h>
37 #define EDAC_MC_LABEL_LEN 31
38 #define MC_PROC_NAME_MAX_LEN 7
41 #define PAGES_TO_MiB( pages ) ( ( pages ) >> ( 20 - PAGE_SHIFT ) )
42 #else /* PAGE_SHIFT > 20 */
43 #define PAGES_TO_MiB( pages ) ( ( pages ) << ( PAGE_SHIFT - 20 ) )
46 #ifdef CONFIG_EDAC_DEBUG
47 extern int edac_debug_level;
48 #define edac_debug_printk(level, fmt, args...) \
49 do { if (level <= edac_debug_level) printk(KERN_DEBUG fmt, ##args); } while(0)
50 #define debugf0( ... ) edac_debug_printk(0, __VA_ARGS__ )
51 #define debugf1( ... ) edac_debug_printk(1, __VA_ARGS__ )
52 #define debugf2( ... ) edac_debug_printk(2, __VA_ARGS__ )
53 #define debugf3( ... ) edac_debug_printk(3, __VA_ARGS__ )
54 #define debugf4( ... ) edac_debug_printk(4, __VA_ARGS__ )
55 #else /* !CONFIG_EDAC_DEBUG */
56 #define debugf0( ... )
57 #define debugf1( ... )
58 #define debugf2( ... )
59 #define debugf3( ... )
60 #define debugf4( ... )
61 #endif /* !CONFIG_EDAC_DEBUG */
64 #define bs_xstr(s) bs_str(s)
66 #define BS_MOD_STR bs_xstr(KBUILD_BASENAME)
68 #define BIT(x) (1 << (x))
70 #define PCI_VEND_DEV(vend, dev) PCI_VENDOR_ID_ ## vend, PCI_DEVICE_ID_ ## vend ## _ ## dev
80 DEV_X32, /* Do these parts exist? */
81 DEV_X64 /* Do these parts exist? */
84 #define DEV_FLAG_UNKNOWN BIT(DEV_UNKNOWN)
85 #define DEV_FLAG_X1 BIT(DEV_X1)
86 #define DEV_FLAG_X2 BIT(DEV_X2)
87 #define DEV_FLAG_X4 BIT(DEV_X4)
88 #define DEV_FLAG_X8 BIT(DEV_X8)
89 #define DEV_FLAG_X16 BIT(DEV_X16)
90 #define DEV_FLAG_X32 BIT(DEV_X32)
91 #define DEV_FLAG_X64 BIT(DEV_X64)
95 MEM_EMPTY = 0, /* Empty csrow */
96 MEM_RESERVED, /* Reserved csrow type */
97 MEM_UNKNOWN, /* Unknown csrow type */
98 MEM_FPM, /* Fast page mode */
99 MEM_EDO, /* Extended data out */
100 MEM_BEDO, /* Burst Extended data out */
101 MEM_SDR, /* Single data rate SDRAM */
102 MEM_RDR, /* Registered single data rate SDRAM */
103 MEM_DDR, /* Double data rate SDRAM */
104 MEM_RDDR, /* Registered Double data rate SDRAM */
105 MEM_RMBS /* Rambus DRAM */
108 #define MEM_FLAG_EMPTY BIT(MEM_EMPTY)
109 #define MEM_FLAG_RESERVED BIT(MEM_RESERVED)
110 #define MEM_FLAG_UNKNOWN BIT(MEM_UNKNOWN)
111 #define MEM_FLAG_FPM BIT(MEM_FPM)
112 #define MEM_FLAG_EDO BIT(MEM_EDO)
113 #define MEM_FLAG_BEDO BIT(MEM_BEDO)
114 #define MEM_FLAG_SDR BIT(MEM_SDR)
115 #define MEM_FLAG_RDR BIT(MEM_RDR)
116 #define MEM_FLAG_DDR BIT(MEM_DDR)
117 #define MEM_FLAG_RDDR BIT(MEM_RDDR)
118 #define MEM_FLAG_RMBS BIT(MEM_RMBS)
121 /* chipset Error Detection and Correction capabilities and mode */
123 EDAC_UNKNOWN = 0, /* Unknown if ECC is available */
124 EDAC_NONE, /* Doesnt support ECC */
125 EDAC_RESERVED, /* Reserved ECC type */
126 EDAC_PARITY, /* Detects parity errors */
127 EDAC_EC, /* Error Checking - no correction */
128 EDAC_SECDED, /* Single bit error correction, Double detection */
129 EDAC_S2ECD2ED, /* Chipkill x2 devices - do these exist? */
130 EDAC_S4ECD4ED, /* Chipkill x4 devices */
131 EDAC_S8ECD8ED, /* Chipkill x8 devices */
132 EDAC_S16ECD16ED, /* Chipkill x16 devices */
135 #define EDAC_FLAG_UNKNOWN BIT(EDAC_UNKNOWN)
136 #define EDAC_FLAG_NONE BIT(EDAC_NONE)
137 #define EDAC_FLAG_PARITY BIT(EDAC_PARITY)
138 #define EDAC_FLAG_EC BIT(EDAC_EC)
139 #define EDAC_FLAG_SECDED BIT(EDAC_SECDED)
140 #define EDAC_FLAG_S2ECD2ED BIT(EDAC_S2ECD2ED)
141 #define EDAC_FLAG_S4ECD4ED BIT(EDAC_S4ECD4ED)
142 #define EDAC_FLAG_S8ECD8ED BIT(EDAC_S8ECD8ED)
143 #define EDAC_FLAG_S16ECD16ED BIT(EDAC_S16ECD16ED)
146 /* scrubbing capabilities */
148 SCRUB_UNKNOWN = 0, /* Unknown if scrubber is available */
149 SCRUB_NONE, /* No scrubber */
150 SCRUB_SW_PROG, /* SW progressive (sequential) scrubbing */
151 SCRUB_SW_SRC, /* Software scrub only errors */
152 SCRUB_SW_PROG_SRC, /* Progressive software scrub from an error */
153 SCRUB_SW_TUNABLE, /* Software scrub frequency is tunable */
154 SCRUB_HW_PROG, /* HW progressive (sequential) scrubbing */
155 SCRUB_HW_SRC, /* Hardware scrub only errors */
156 SCRUB_HW_PROG_SRC, /* Progressive hardware scrub from an error */
157 SCRUB_HW_TUNABLE /* Hardware scrub frequency is tunable */
160 #define SCRUB_FLAG_SW_PROG BIT(SCRUB_SW_PROG)
161 #define SCRUB_FLAG_SW_SRC BIT(SCRUB_SW_SRC_CORR)
162 #define SCRUB_FLAG_SW_PROG_SRC BIT(SCRUB_SW_PROG_SRC_CORR)
163 #define SCRUB_FLAG_SW_TUN BIT(SCRUB_SW_SCRUB_TUNABLE)
164 #define SCRUB_FLAG_HW_PROG BIT(SCRUB_HW_PROG)
165 #define SCRUB_FLAG_HW_SRC BIT(SCRUB_HW_SRC_CORR)
166 #define SCRUB_FLAG_HW_PROG_SRC BIT(SCRUB_HW_PROG_SRC_CORR)
167 #define SCRUB_FLAG_HW_TUN BIT(SCRUB_HW_TUNABLE)
169 enum mci_sysfs_status {
170 MCI_SYSFS_INACTIVE = 0, /* sysfs entries NOT registered */
171 MCI_SYSFS_ACTIVE /* sysfs entries ARE registered */
174 /* FIXME - should have notify capabilities: NMI, LOG, PROC, etc */
177 * There are several things to be aware of that aren't at all obvious:
180 * SOCKETS, SOCKET SETS, BANKS, ROWS, CHIP-SELECT ROWS, CHANNELS, etc..
182 * These are some of the many terms that are thrown about that don't always
183 * mean what people think they mean (Inconceivable!). In the interest of
184 * creating a common ground for discussion, terms and their definitions
185 * will be established.
187 * Memory devices: The individual chip on a memory stick. These devices
188 * commonly output 4 and 8 bits each. Grouping several
189 * of these in parallel provides 64 bits which is common
190 * for a memory stick.
192 * Memory Stick: A printed circuit board that agregates multiple
193 * memory devices in parallel. This is the atomic
194 * memory component that is purchaseable by Joe consumer
195 * and loaded into a memory socket.
197 * Socket: A physical connector on the motherboard that accepts
198 * a single memory stick.
200 * Channel: Set of memory devices on a memory stick that must be
201 * grouped in parallel with one or more additional
202 * channels from other memory sticks. This parallel
203 * grouping of the output from multiple channels are
204 * necessary for the smallest granularity of memory access.
205 * Some memory controllers are capable of single channel -
206 * which means that memory sticks can be loaded
207 * individually. Other memory controllers are only
208 * capable of dual channel - which means that memory
209 * sticks must be loaded as pairs (see "socket set").
211 * Chip-select row: All of the memory devices that are selected together.
212 * for a single, minimum grain of memory access.
213 * This selects all of the parallel memory devices across
214 * all of the parallel channels. Common chip-select rows
215 * for single channel are 64 bits, for dual channel 128
218 * Single-Ranked stick: A Single-ranked stick has 1 chip-select row of memmory.
219 * Motherboards commonly drive two chip-select pins to
220 * a memory stick. A single-ranked stick, will occupy
221 * only one of those rows. The other will be unused.
223 * Double-Ranked stick: A double-ranked stick has two chip-select rows which
224 * access different sets of memory devices. The two
225 * rows cannot be accessed concurrently.
227 * Double-sided stick: DEPRECATED TERM, see Double-Ranked stick.
228 * A double-sided stick has two chip-select rows which
229 * access different sets of memory devices. The two
230 * rows cannot be accessed concurrently. "Double-sided"
231 * is irrespective of the memory devices being mounted
232 * on both sides of the memory stick.
234 * Socket set: All of the memory sticks that are required for for
235 * a single memory access or all of the memory sticks
236 * spanned by a chip-select row. A single socket set
237 * has two chip-select rows and if double-sided sticks
238 * are used these will occupy those chip-select rows.
240 * Bank: This term is avoided because it is unclear when
241 * needing to distinguish between chip-select rows and
251 * STRUCTURE ORGANIZATION AND CHOICES
255 * PS - I enjoyed writing all that about as much as you enjoyed reading it.
259 struct channel_info {
260 int chan_idx; /* channel index */
261 u32 ce_count; /* Correctable Errors for this CHANNEL */
262 char label[EDAC_MC_LABEL_LEN + 1]; /* DIMM label on motherboard */
263 struct csrow_info *csrow; /* the parent */
268 unsigned long first_page; /* first page number in dimm */
269 unsigned long last_page; /* last page number in dimm */
270 unsigned long page_mask; /* used for interleaving -
272 u32 nr_pages; /* number of pages in csrow */
273 u32 grain; /* granularity of reported error in bytes */
274 int csrow_idx; /* the chip-select row */
275 enum dev_type dtype; /* memory device type */
276 u32 ue_count; /* Uncorrectable Errors for this csrow */
277 u32 ce_count; /* Correctable Errors for this csrow */
278 enum mem_type mtype; /* memory csrow type */
279 enum edac_type edac_mode; /* EDAC mode for this csrow */
280 struct mem_ctl_info *mci; /* the parent */
282 struct kobject kobj; /* sysfs kobject for this csrow */
284 /* FIXME the number of CHANNELs might need to become dynamic */
286 struct channel_info *channels;
290 struct mem_ctl_info {
291 struct list_head link; /* for global list of mem_ctl_info structs */
292 unsigned long mtype_cap; /* memory types supported by mc */
293 unsigned long edac_ctl_cap; /* Mem controller EDAC capabilities */
294 unsigned long edac_cap; /* configuration capabilities - this is
295 closely related to edac_ctl_cap. The
296 difference is that the controller
297 may be capable of s4ecd4ed which would
298 be listed in edac_ctl_cap, but if
299 channels aren't capable of s4ecd4ed then the
300 edac_cap would not have that capability. */
301 unsigned long scrub_cap; /* chipset scrub capabilities */
302 enum scrub_type scrub_mode; /* current scrub mode */
304 enum mci_sysfs_status sysfs_active; /* status of sysfs */
306 /* pointer to edac checking routine */
307 void (*edac_check) (struct mem_ctl_info * mci);
309 * Remaps memory pages: controller pages to physical pages.
310 * For most MC's, this will be NULL.
312 /* FIXME - why not send the phys page to begin with? */
313 unsigned long (*ctl_page_to_phys) (struct mem_ctl_info * mci,
317 struct csrow_info *csrows;
319 * FIXME - what about controllers on other busses? - IDs must be
320 * unique. pdev pointer should be sufficiently unique, but
321 * BUS:SLOT.FUNC numbers may not be unique.
323 struct pci_dev *pdev;
324 const char *mod_name;
326 const char *ctl_name;
327 char proc_name[MC_PROC_NAME_MAX_LEN + 1];
329 u32 ue_noinfo_count; /* Uncorrectable Errors w/o info */
330 u32 ce_noinfo_count; /* Correctable Errors w/o info */
331 u32 ue_count; /* Total Uncorrectable Errors for this MC */
332 u32 ce_count; /* Total Correctable Errors for this MC */
333 unsigned long start_time; /* mci load start time (in jiffies) */
335 /* this stuff is for safe removal of mc devices from global list while
336 * NMI handlers may be traversing list
339 struct completion complete;
341 /* edac sysfs device control */
342 struct kobject edac_mci_kobj;
347 /* write all or some bits in a byte-register*/
348 static inline void pci_write_bits8(struct pci_dev *pdev, int offset,
353 pci_read_config_byte(pdev, offset, &buf);
358 pci_write_config_byte(pdev, offset, value);
362 /* write all or some bits in a word-register*/
363 static inline void pci_write_bits16(struct pci_dev *pdev, int offset,
366 if (mask != 0xffff) {
368 pci_read_config_word(pdev, offset, &buf);
373 pci_write_config_word(pdev, offset, value);
377 /* write all or some bits in a dword-register*/
378 static inline void pci_write_bits32(struct pci_dev *pdev, int offset,
381 if (mask != 0xffff) {
383 pci_read_config_dword(pdev, offset, &buf);
388 pci_write_config_dword(pdev, offset, value);
392 #ifdef CONFIG_EDAC_DEBUG
393 void edac_mc_dump_channel(struct channel_info *chan);
394 void edac_mc_dump_mci(struct mem_ctl_info *mci);
395 void edac_mc_dump_csrow(struct csrow_info *csrow);
396 #endif /* CONFIG_EDAC_DEBUG */
398 extern int edac_mc_add_mc(struct mem_ctl_info *mci);
399 extern int edac_mc_del_mc(struct mem_ctl_info *mci);
401 extern int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci,
404 extern struct mem_ctl_info *edac_mc_find_mci_by_pdev(struct pci_dev
407 extern void edac_mc_scrub_block(unsigned long page,
408 unsigned long offset, u32 size);
411 * The no info errors are used when error overflows are reported.
412 * There are a limited number of error logging registers that can
413 * be exausted. When all registers are exhausted and an additional
414 * error occurs then an error overflow register records that an
415 * error occured and the type of error, but doesn't have any
416 * further information. The ce/ue versions make for cleaner
417 * reporting logic and function interface - reduces conditional
418 * statement clutter and extra function arguments.
420 extern void edac_mc_handle_ce(struct mem_ctl_info *mci,
421 unsigned long page_frame_number,
422 unsigned long offset_in_page,
423 unsigned long syndrome,
424 int row, int channel, const char *msg);
426 extern void edac_mc_handle_ce_no_info(struct mem_ctl_info *mci,
429 extern void edac_mc_handle_ue(struct mem_ctl_info *mci,
430 unsigned long page_frame_number,
431 unsigned long offset_in_page,
432 int row, const char *msg);
434 extern void edac_mc_handle_ue_no_info(struct mem_ctl_info *mci,
438 * This kmalloc's and initializes all the structures.
439 * Can't be used if all structures don't have the same lifetime.
441 extern struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt,
442 unsigned nr_csrows, unsigned nr_chans);
444 /* Free an mc previously allocated by edac_mc_alloc() */
445 extern void edac_mc_free(struct mem_ctl_info *mci);
448 #endif /* _EDAC_MC_H_ */