1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * Page retirement can be an extended process due to the fact that a retirement
29 * may not be possible when the original request is made. The kernel will
30 * repeatedly attempt to retire a given page, but will not let us know when the
31 * page has been retired. We therefore have to poll to see if the retirement
32 * has been completed. This poll is implemented with a bounded exponential
33 * backoff to reduce the burden which we impose upon the system.
34 *
35 * To reduce the burden on fmd in the face of retirement storms, we schedule
36 * all retries as a group. In the simplest case, we attempt to retire a single
37 * page. When forced to retry, we initially schedule a retry at a configurable
38 * interval t. If the retry fails, we schedule another at 2 * t, and so on,
39 * until t reaches the maximum interval (also configurable). Future retries
40 * for that page will occur with t equal to the maximum interval value. We
41 * will never give up on a retirement.
42 *
43 * With multiple retirements, the situation gets slightly more complicated. As
44 * indicated above, we schedule retries as a group. We don't want to deny new
45 * pages their short retry intervals, so we'll (re)set the retry interval to the
46 * value appropriate for the newest page.
47 */
48
49 #include <cma.h>
50
51 #include <time.h>
52 #include <errno.h>
53 #include <unistd.h>
54 #include <strings.h>
55 #include <fm/fmd_api.h>
56 #include <fm/libtopo.h>
57 #include <fm/fmd_fmri.h>
58 #include <fm/fmd_agent.h>
59 #include <sys/fm/protocol.h>
60
61 static void
cma_page_free(fmd_hdl_t * hdl,cma_page_t * page)62 cma_page_free(fmd_hdl_t *hdl, cma_page_t *page)
63 {
64 nvlist_free(page->pg_asru);
65 nvlist_free(page->pg_rsrc);
66 fmd_hdl_free(hdl, page, sizeof (cma_page_t));
67 }
68
69 /*
70 * Retire the specified ASRU, referring to a memory page by PA or by DIMM
71 * offset (i.e. the encoded coordinates internal bank, row, and column).
72 * In the initial FMA implementation, fault.memory.page exported an ASRU
73 * with an explicit physical address, which is valid at the initial time of
74 * diagnosis but may not be later following DR, DIMM removal, or interleave
75 * changes. On SPARC, this issue was solved by exporting the DIMM offset
76 * and pushing the entire FMRI to the platform memory controller through
77 * /dev/fm so it can derive the current PA from the DIMM and offset.
78 * On x86, we also encode DIMM and offset in hc-specific, which is then used
79 * by the x64 memory controller driver.
80 * At some point these three approaches need to be rationalized: all platforms
81 * should use the same scheme, either with decoding in the kernel or decoding
82 * in userland (i.e. with a libtopo method to compute and update the PA).
83 */
84 /*ARGSUSED*/
85 int
cma_page_retire(fmd_hdl_t * hdl,nvlist_t * nvl,nvlist_t * asru,const char * uuid,boolean_t repair)86 cma_page_retire(fmd_hdl_t *hdl, nvlist_t *nvl, nvlist_t *asru,
87 const char *uuid, boolean_t repair)
88 {
89 cma_page_t *page;
90 uint64_t pageaddr;
91 const char *action = repair ? "unretire" : "retire";
92 int rc;
93 nvlist_t *rsrc = NULL, *asrucp = NULL, *hcsp;
94
95 (void) nvlist_lookup_nvlist(nvl, FM_FAULT_RESOURCE, &rsrc);
96
97 if (nvlist_dup(asru, &asrucp, 0) != 0) {
98 fmd_hdl_debug(hdl, "page retire nvlist dup failed\n");
99 return (CMA_RA_FAILURE);
100 }
101
102 /* It should already be expanded, but we'll do it again anyway */
103 if (fmd_nvl_fmri_expand(hdl, asrucp) < 0) {
104 fmd_hdl_debug(hdl, "failed to expand page asru\n");
105 cma_stats.bad_flts.fmds_value.ui64++;
106 nvlist_free(asrucp);
107 return (CMA_RA_FAILURE);
108 }
109
110 if (!repair && !fmd_nvl_fmri_present(hdl, asrucp)) {
111 fmd_hdl_debug(hdl, "page retire overtaken by events\n");
112 cma_stats.page_nonent.fmds_value.ui64++;
113 nvlist_free(asrucp);
114 return (CMA_RA_SUCCESS);
115 }
116
117 /* Figure out physaddr from resource or asru */
118 if (rsrc == NULL ||
119 nvlist_lookup_nvlist(rsrc, FM_FMRI_HC_SPECIFIC, &hcsp) != 0 ||
120 (nvlist_lookup_uint64(hcsp, "asru-" FM_FMRI_HC_SPECIFIC_PHYSADDR,
121 &pageaddr) != 0 && nvlist_lookup_uint64(hcsp,
122 FM_FMRI_HC_SPECIFIC_PHYSADDR, &pageaddr) != 0)) {
123 if (nvlist_lookup_uint64(asrucp, FM_FMRI_MEM_PHYSADDR,
124 &pageaddr) != 0) {
125 fmd_hdl_debug(hdl, "mem fault missing 'physaddr'\n");
126 cma_stats.bad_flts.fmds_value.ui64++;
127 nvlist_free(asrucp);
128 return (CMA_RA_FAILURE);
129 }
130 }
131
132 if (repair) {
133 if (!cma.cma_page_dounretire) {
134 fmd_hdl_debug(hdl, "suppressed unretire of page %llx\n",
135 (u_longlong_t)pageaddr);
136 cma_stats.page_supp.fmds_value.ui64++;
137 nvlist_free(asrucp);
138 return (CMA_RA_SUCCESS);
139 }
140 /* If unretire via topo fails, we fall back to legacy way */
141 if (rsrc == NULL || (rc = fmd_nvl_fmri_unretire(hdl, rsrc)) < 0)
142 rc = cma_fmri_page_unretire(hdl, asrucp);
143 } else {
144 if (!cma.cma_page_doretire) {
145 fmd_hdl_debug(hdl, "suppressed retire of page %llx\n",
146 (u_longlong_t)pageaddr);
147 cma_stats.page_supp.fmds_value.ui64++;
148 nvlist_free(asrucp);
149 return (CMA_RA_FAILURE);
150 }
151 /* If retire via topo fails, we fall back to legacy way */
152 if (rsrc == NULL || (rc = fmd_nvl_fmri_retire(hdl, rsrc)) < 0)
153 rc = cma_fmri_page_retire(hdl, asrucp);
154 }
155
156 if (rc == FMD_AGENT_RETIRE_DONE) {
157 fmd_hdl_debug(hdl, "%sd page 0x%llx\n",
158 action, (u_longlong_t)pageaddr);
159 if (repair)
160 cma_stats.page_repairs.fmds_value.ui64++;
161 else
162 cma_stats.page_flts.fmds_value.ui64++;
163 nvlist_free(asrucp);
164 return (CMA_RA_SUCCESS);
165 } else if (repair || rc != FMD_AGENT_RETIRE_ASYNC) {
166 fmd_hdl_debug(hdl, "%s of page 0x%llx failed, will not "
167 "retry: %s\n", action, (u_longlong_t)pageaddr,
168 strerror(errno));
169
170 cma_stats.page_fails.fmds_value.ui64++;
171 nvlist_free(asrucp);
172 return (CMA_RA_FAILURE);
173 }
174
175 /*
176 * The page didn't immediately retire. We'll need to periodically
177 * check to see if it has been retired.
178 */
179 fmd_hdl_debug(hdl, "page didn't retire - sleeping\n");
180
181 page = fmd_hdl_zalloc(hdl, sizeof (cma_page_t), FMD_SLEEP);
182 page->pg_addr = pageaddr;
183 if (rsrc != NULL)
184 (void) nvlist_dup(rsrc, &page->pg_rsrc, 0);
185 page->pg_asru = asrucp;
186 if (uuid != NULL)
187 page->pg_uuid = fmd_hdl_strdup(hdl, uuid, FMD_SLEEP);
188
189 page->pg_next = cma.cma_pages;
190 cma.cma_pages = page;
191
192 if (cma.cma_page_timerid != 0)
193 fmd_timer_remove(hdl, cma.cma_page_timerid);
194
195 cma.cma_page_curdelay = cma.cma_page_mindelay;
196
197 cma.cma_page_timerid =
198 fmd_timer_install(hdl, NULL, NULL, cma.cma_page_curdelay);
199
200 /* Don't free asrucp here. This FMRI will be needed for retry. */
201 return (CMA_RA_FAILURE);
202 }
203
204 static int
page_retry(fmd_hdl_t * hdl,cma_page_t * page)205 page_retry(fmd_hdl_t *hdl, cma_page_t *page)
206 {
207 int rc;
208
209 if (page->pg_asru != NULL &&
210 !fmd_nvl_fmri_present(hdl, page->pg_asru)) {
211 fmd_hdl_debug(hdl, "page retire overtaken by events");
212 cma_stats.page_nonent.fmds_value.ui64++;
213
214 if (page->pg_uuid != NULL)
215 fmd_case_uuclose(hdl, page->pg_uuid);
216 return (1); /* no longer a page to retire */
217 }
218
219 if (page->pg_rsrc == NULL ||
220 (rc = fmd_nvl_fmri_service_state(hdl, page->pg_rsrc)) < 0)
221 rc = cma_fmri_page_service_state(hdl, page->pg_asru);
222
223 if (rc == FMD_SERVICE_STATE_UNUSABLE) {
224 fmd_hdl_debug(hdl, "retired page 0x%llx on retry %u\n",
225 page->pg_addr, page->pg_nretries);
226 cma_stats.page_flts.fmds_value.ui64++;
227
228 if (page->pg_uuid != NULL)
229 fmd_case_uuclose(hdl, page->pg_uuid);
230 return (1); /* page retired */
231 }
232
233 if (rc == FMD_SERVICE_STATE_ISOLATE_PENDING) {
234 fmd_hdl_debug(hdl, "scheduling another retry for 0x%llx\n",
235 page->pg_addr);
236 return (0); /* schedule another retry */
237 } else {
238 fmd_hdl_debug(hdl, "failed to retry page 0x%llx "
239 "retirement: %s\n", page->pg_addr,
240 strerror(errno));
241
242 cma_stats.page_fails.fmds_value.ui64++;
243 return (1); /* give up */
244 }
245 }
246
247 void
cma_page_retry(fmd_hdl_t * hdl)248 cma_page_retry(fmd_hdl_t *hdl)
249 {
250 cma_page_t **pagep;
251
252 cma.cma_page_timerid = 0;
253
254 fmd_hdl_debug(hdl, "page_retry: timer fired\n");
255
256 pagep = &cma.cma_pages;
257 while (*pagep != NULL) {
258 cma_page_t *page = *pagep;
259
260 if (page_retry(hdl, page)) {
261 /*
262 * Successful retry or we're giving up - remove from
263 * the list
264 */
265 *pagep = page->pg_next;
266
267 if (page->pg_uuid != NULL)
268 fmd_hdl_strfree(hdl, page->pg_uuid);
269
270 cma_page_free(hdl, page);
271 } else {
272 page->pg_nretries++;
273 pagep = &page->pg_next;
274 }
275 }
276
277 if (cma.cma_pages == NULL)
278 return; /* no more retirements */
279
280 /*
281 * We still have retirements that haven't completed. Back the delay
282 * off, and schedule a retry.
283 */
284 cma.cma_page_curdelay = MIN(cma.cma_page_curdelay * 2,
285 cma.cma_page_maxdelay);
286
287 fmd_hdl_debug(hdl, "scheduled page retirement retry for %llu secs\n",
288 (u_longlong_t)(cma.cma_page_curdelay / NANOSEC));
289
290 cma.cma_page_timerid =
291 fmd_timer_install(hdl, NULL, NULL, cma.cma_page_curdelay);
292 }
293
294 void
cma_page_fini(fmd_hdl_t * hdl)295 cma_page_fini(fmd_hdl_t *hdl)
296 {
297 cma_page_t *page;
298
299 while ((page = cma.cma_pages) != NULL) {
300 cma.cma_pages = page->pg_next;
301 if (page->pg_uuid != NULL)
302 fmd_hdl_strfree(hdl, page->pg_uuid);
303 cma_page_free(hdl, page);
304 }
305 }
306