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 62 cma_page_free(fmd_hdl_t *hdl, cma_page_t *page) 63 { 64 if (page->pg_fmri != NULL) 65 nvlist_free(page->pg_fmri); 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 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 nvlist_t *fmri = NULL; 92 const char *action = repair ? "unretire" : "retire"; 93 int rc; 94 #ifdef i386 95 nvlist_t *rsrc, *hcsp; 96 97 /* 98 * On x86, retire is done by resource 99 */ 100 if (nvlist_lookup_nvlist(nvl, FM_FAULT_RESOURCE, &rsrc) != 0) { 101 fmd_hdl_debug(hdl, "page retire resource lookup failed\n"); 102 cma_stats.bad_flts.fmds_value.ui64++; 103 return (CMA_RA_FAILURE); 104 } 105 if (nvlist_dup(rsrc, &fmri, 0) != 0) { 106 fmd_hdl_debug(hdl, "page retire nvlist dup failed\n"); 107 return (CMA_RA_FAILURE); 108 } 109 #else /* i386 */ 110 if (nvlist_dup(asru, &fmri, 0) != 0) { 111 fmd_hdl_debug(hdl, "page retire nvlist dup failed\n"); 112 return (CMA_RA_FAILURE); 113 } 114 115 /* It should already be expanded, but we'll do it again anyway */ 116 if (fmd_nvl_fmri_expand(hdl, fmri) < 0) { 117 fmd_hdl_debug(hdl, "failed to expand page asru\n"); 118 cma_stats.bad_flts.fmds_value.ui64++; 119 nvlist_free(fmri); 120 return (CMA_RA_FAILURE); 121 } 122 #endif /* i386 */ 123 124 if (!repair && !fmd_nvl_fmri_present(hdl, fmri)) { 125 fmd_hdl_debug(hdl, "page retire overtaken by events\n"); 126 cma_stats.page_nonent.fmds_value.ui64++; 127 nvlist_free(fmri); 128 return (CMA_RA_SUCCESS); 129 } 130 131 #ifdef i386 132 if (nvlist_lookup_nvlist(fmri, FM_FMRI_HC_SPECIFIC, &hcsp) != 0 || 133 (nvlist_lookup_uint64(hcsp, "asru-" FM_FMRI_HC_SPECIFIC_PHYSADDR, 134 &pageaddr) != 0 && nvlist_lookup_uint64(hcsp, 135 FM_FMRI_HC_SPECIFIC_PHYSADDR, &pageaddr) != 0)) { 136 #else 137 if (nvlist_lookup_uint64(fmri, FM_FMRI_MEM_PHYSADDR, &pageaddr) 138 != 0) { 139 #endif 140 fmd_hdl_debug(hdl, "mem fault missing 'physaddr'\n"); 141 cma_stats.bad_flts.fmds_value.ui64++; 142 nvlist_free(fmri); 143 return (CMA_RA_FAILURE); 144 } 145 146 if (repair) { 147 if (!cma.cma_page_dounretire) { 148 fmd_hdl_debug(hdl, "suppressed unretire of page %llx\n", 149 (u_longlong_t)pageaddr); 150 cma_stats.page_supp.fmds_value.ui64++; 151 nvlist_free(fmri); 152 return (CMA_RA_SUCCESS); 153 } 154 } else { 155 if (!cma.cma_page_doretire) { 156 fmd_hdl_debug(hdl, "suppressed retire of page %llx\n", 157 (u_longlong_t)pageaddr); 158 cma_stats.page_supp.fmds_value.ui64++; 159 nvlist_free(fmri); 160 return (CMA_RA_FAILURE); 161 } 162 } 163 164 if (repair) 165 rc = cma_fmri_page_unretire(hdl, fmri); 166 else 167 rc = cma_fmri_page_retire(hdl, fmri); 168 if (rc == FMD_AGENT_RETIRE_DONE) { 169 fmd_hdl_debug(hdl, "%sd page 0x%llx\n", 170 action, (u_longlong_t)pageaddr); 171 if (repair) 172 cma_stats.page_repairs.fmds_value.ui64++; 173 else 174 cma_stats.page_flts.fmds_value.ui64++; 175 nvlist_free(fmri); 176 return (CMA_RA_SUCCESS); 177 } else if (repair || rc != FMD_AGENT_RETIRE_ASYNC) { 178 fmd_hdl_debug(hdl, "%s of page 0x%llx failed, will not " 179 "retry: %s\n", action, (u_longlong_t)pageaddr, 180 strerror(errno)); 181 182 cma_stats.page_fails.fmds_value.ui64++; 183 184 nvlist_free(fmri); 185 return (CMA_RA_FAILURE); 186 } 187 188 /* 189 * The page didn't immediately retire. We'll need to periodically 190 * check to see if it has been retired. 191 */ 192 fmd_hdl_debug(hdl, "page didn't retire - sleeping\n"); 193 194 page = fmd_hdl_zalloc(hdl, sizeof (cma_page_t), FMD_SLEEP); 195 page->pg_addr = pageaddr; 196 page->pg_fmri = fmri; 197 if (uuid != NULL) 198 page->pg_uuid = fmd_hdl_strdup(hdl, uuid, FMD_SLEEP); 199 200 page->pg_next = cma.cma_pages; 201 cma.cma_pages = page; 202 203 if (cma.cma_page_timerid != 0) 204 fmd_timer_remove(hdl, cma.cma_page_timerid); 205 206 cma.cma_page_curdelay = cma.cma_page_mindelay; 207 208 cma.cma_page_timerid = 209 fmd_timer_install(hdl, NULL, NULL, cma.cma_page_curdelay); 210 211 /* Don't free fmri here. This FMRI will be needed for retry. */ 212 return (CMA_RA_FAILURE); 213 } 214 215 static int 216 page_retry(fmd_hdl_t *hdl, cma_page_t *page) 217 { 218 int rc; 219 220 if (page->pg_fmri != NULL && !fmd_nvl_fmri_present(hdl, 221 page->pg_fmri)) { 222 fmd_hdl_debug(hdl, "page retire overtaken by events"); 223 cma_stats.page_nonent.fmds_value.ui64++; 224 225 if (page->pg_uuid != NULL) 226 fmd_case_uuclose(hdl, page->pg_uuid); 227 return (1); /* no longer a page to retire */ 228 } 229 230 rc = cma_fmri_page_service_state(hdl, page->pg_fmri); 231 if (rc == FMD_SERVICE_STATE_UNUSABLE) { 232 fmd_hdl_debug(hdl, "retired page 0x%llx on retry %u\n", 233 page->pg_addr, page->pg_nretries); 234 cma_stats.page_flts.fmds_value.ui64++; 235 236 if (page->pg_uuid != NULL) 237 fmd_case_uuclose(hdl, page->pg_uuid); 238 return (1); /* page retired */ 239 } 240 241 if (rc == FMD_SERVICE_STATE_ISOLATE_PENDING) { 242 fmd_hdl_debug(hdl, "scheduling another retry for 0x%llx\n", 243 page->pg_addr); 244 return (0); /* schedule another retry */ 245 } else { 246 fmd_hdl_debug(hdl, "failed to retry page 0x%llx " 247 "retirement: %s\n", page->pg_addr, 248 strerror(errno)); 249 250 cma_stats.page_fails.fmds_value.ui64++; 251 return (1); /* give up */ 252 } 253 } 254 255 void 256 cma_page_retry(fmd_hdl_t *hdl) 257 { 258 cma_page_t **pagep; 259 260 cma.cma_page_timerid = 0; 261 262 fmd_hdl_debug(hdl, "page_retry: timer fired\n"); 263 264 pagep = &cma.cma_pages; 265 while (*pagep != NULL) { 266 cma_page_t *page = *pagep; 267 268 if (page_retry(hdl, page)) { 269 /* 270 * Successful retry or we're giving up - remove from 271 * the list 272 */ 273 *pagep = page->pg_next; 274 275 if (page->pg_uuid != NULL) 276 fmd_hdl_strfree(hdl, page->pg_uuid); 277 278 cma_page_free(hdl, page); 279 } else { 280 page->pg_nretries++; 281 pagep = &page->pg_next; 282 } 283 } 284 285 if (cma.cma_pages == NULL) 286 return; /* no more retirements */ 287 288 /* 289 * We still have retirements that haven't completed. Back the delay 290 * off, and schedule a retry. 291 */ 292 cma.cma_page_curdelay = MIN(cma.cma_page_curdelay * 2, 293 cma.cma_page_maxdelay); 294 295 fmd_hdl_debug(hdl, "scheduled page retirement retry for %llu secs\n", 296 (u_longlong_t)(cma.cma_page_curdelay / NANOSEC)); 297 298 cma.cma_page_timerid = 299 fmd_timer_install(hdl, NULL, NULL, cma.cma_page_curdelay); 300 } 301 302 void 303 cma_page_fini(fmd_hdl_t *hdl) 304 { 305 cma_page_t *page; 306 307 while ((page = cma.cma_pages) != NULL) { 308 cma.cma_pages = page->pg_next; 309 cma_page_free(hdl, page); 310 } 311 } 312