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1 | // SPDX-License-Identifier: GPL-2.0-or-later | |
2 | /* | |
3 | * Copyright (C) 2013 Imagination Technologies | |
4 | * Author: Paul Burton <paul.burton@mips.com> | |
5 | */ | |
6 | ||
7 | #include <linux/errno.h> | |
8 | #include <linux/percpu.h> | |
9 | #include <linux/spinlock.h> | |
10 | ||
11 | #include <asm/mips-cps.h> | |
12 | #include <asm/mipsregs.h> | |
13 | ||
14 | void __iomem *mips_gcr_base; | |
15 | void __iomem *mips_cm_l2sync_base; | |
16 | int mips_cm_is64; | |
17 | ||
18 | static char *cm2_tr[8] = { | |
19 | "mem", "gcr", "gic", "mmio", | |
20 | "0x04", "cpc", "0x06", "0x07" | |
21 | }; | |
22 | ||
23 | /* CM3 Tag ECC transaction type */ | |
24 | static char *cm3_tr[16] = { | |
25 | [0x0] = "ReqNoData", | |
26 | [0x1] = "0x1", | |
27 | [0x2] = "ReqWData", | |
28 | [0x3] = "0x3", | |
29 | [0x4] = "IReqNoResp", | |
30 | [0x5] = "IReqWResp", | |
31 | [0x6] = "IReqNoRespDat", | |
32 | [0x7] = "IReqWRespDat", | |
33 | [0x8] = "RespNoData", | |
34 | [0x9] = "RespDataFol", | |
35 | [0xa] = "RespWData", | |
36 | [0xb] = "RespDataOnly", | |
37 | [0xc] = "IRespNoData", | |
38 | [0xd] = "IRespDataFol", | |
39 | [0xe] = "IRespWData", | |
40 | [0xf] = "IRespDataOnly" | |
41 | }; | |
42 | ||
43 | static char *cm2_cmd[32] = { | |
44 | [0x00] = "0x00", | |
45 | [0x01] = "Legacy Write", | |
46 | [0x02] = "Legacy Read", | |
47 | [0x03] = "0x03", | |
48 | [0x04] = "0x04", | |
49 | [0x05] = "0x05", | |
50 | [0x06] = "0x06", | |
51 | [0x07] = "0x07", | |
52 | [0x08] = "Coherent Read Own", | |
53 | [0x09] = "Coherent Read Share", | |
54 | [0x0a] = "Coherent Read Discard", | |
55 | [0x0b] = "Coherent Ready Share Always", | |
56 | [0x0c] = "Coherent Upgrade", | |
57 | [0x0d] = "Coherent Writeback", | |
58 | [0x0e] = "0x0e", | |
59 | [0x0f] = "0x0f", | |
60 | [0x10] = "Coherent Copyback", | |
61 | [0x11] = "Coherent Copyback Invalidate", | |
62 | [0x12] = "Coherent Invalidate", | |
63 | [0x13] = "Coherent Write Invalidate", | |
64 | [0x14] = "Coherent Completion Sync", | |
65 | [0x15] = "0x15", | |
66 | [0x16] = "0x16", | |
67 | [0x17] = "0x17", | |
68 | [0x18] = "0x18", | |
69 | [0x19] = "0x19", | |
70 | [0x1a] = "0x1a", | |
71 | [0x1b] = "0x1b", | |
72 | [0x1c] = "0x1c", | |
73 | [0x1d] = "0x1d", | |
74 | [0x1e] = "0x1e", | |
75 | [0x1f] = "0x1f" | |
76 | }; | |
77 | ||
78 | /* CM3 Tag ECC command type */ | |
79 | static char *cm3_cmd[16] = { | |
80 | [0x0] = "Legacy Read", | |
81 | [0x1] = "Legacy Write", | |
82 | [0x2] = "Coherent Read Own", | |
83 | [0x3] = "Coherent Read Share", | |
84 | [0x4] = "Coherent Read Discard", | |
85 | [0x5] = "Coherent Evicted", | |
86 | [0x6] = "Coherent Upgrade", | |
87 | [0x7] = "Coherent Upgrade for Store Conditional", | |
88 | [0x8] = "Coherent Writeback", | |
89 | [0x9] = "Coherent Write Invalidate", | |
90 | [0xa] = "0xa", | |
91 | [0xb] = "0xb", | |
92 | [0xc] = "0xc", | |
93 | [0xd] = "0xd", | |
94 | [0xe] = "0xe", | |
95 | [0xf] = "0xf" | |
96 | }; | |
97 | ||
98 | /* CM3 Tag ECC command group */ | |
99 | static char *cm3_cmd_group[8] = { | |
100 | [0x0] = "Normal", | |
101 | [0x1] = "Registers", | |
102 | [0x2] = "TLB", | |
103 | [0x3] = "0x3", | |
104 | [0x4] = "L1I", | |
105 | [0x5] = "L1D", | |
106 | [0x6] = "L3", | |
107 | [0x7] = "L2" | |
108 | }; | |
109 | ||
110 | static char *cm2_core[8] = { | |
111 | "Invalid/OK", "Invalid/Data", | |
112 | "Shared/OK", "Shared/Data", | |
113 | "Modified/OK", "Modified/Data", | |
114 | "Exclusive/OK", "Exclusive/Data" | |
115 | }; | |
116 | ||
117 | static char *cm2_causes[32] = { | |
118 | "None", "GC_WR_ERR", "GC_RD_ERR", "COH_WR_ERR", | |
119 | "COH_RD_ERR", "MMIO_WR_ERR", "MMIO_RD_ERR", "0x07", | |
120 | "0x08", "0x09", "0x0a", "0x0b", | |
121 | "0x0c", "0x0d", "0x0e", "0x0f", | |
122 | "0x10", "0x11", "0x12", "0x13", | |
123 | "0x14", "0x15", "0x16", "INTVN_WR_ERR", | |
124 | "INTVN_RD_ERR", "0x19", "0x1a", "0x1b", | |
125 | "0x1c", "0x1d", "0x1e", "0x1f" | |
126 | }; | |
127 | ||
128 | static char *cm3_causes[32] = { | |
129 | "0x0", "MP_CORRECTABLE_ECC_ERR", "MP_REQUEST_DECODE_ERR", | |
130 | "MP_UNCORRECTABLE_ECC_ERR", "MP_PARITY_ERR", "MP_COHERENCE_ERR", | |
131 | "CMBIU_REQUEST_DECODE_ERR", "CMBIU_PARITY_ERR", "CMBIU_AXI_RESP_ERR", | |
132 | "0x9", "RBI_BUS_ERR", "0xb", "0xc", "0xd", "0xe", "0xf", "0x10", | |
133 | "0x11", "0x12", "0x13", "0x14", "0x15", "0x16", "0x17", "0x18", | |
134 | "0x19", "0x1a", "0x1b", "0x1c", "0x1d", "0x1e", "0x1f" | |
135 | }; | |
136 | ||
137 | static DEFINE_PER_CPU_ALIGNED(spinlock_t, cm_core_lock); | |
138 | static DEFINE_PER_CPU_ALIGNED(unsigned long, cm_core_lock_flags); | |
139 | ||
140 | phys_addr_t __mips_cm_phys_base(void) | |
141 | { | |
142 | u32 config3 = read_c0_config3(); | |
143 | unsigned long cmgcr; | |
144 | ||
145 | /* Check the CMGCRBase register is implemented */ | |
146 | if (!(config3 & MIPS_CONF3_CMGCR)) | |
147 | return 0; | |
148 | ||
149 | /* Read the address from CMGCRBase */ | |
150 | cmgcr = read_c0_cmgcrbase(); | |
151 | return (cmgcr & MIPS_CMGCRF_BASE) << (36 - 32); | |
152 | } | |
153 | ||
154 | phys_addr_t mips_cm_phys_base(void) | |
155 | __attribute__((weak, alias("__mips_cm_phys_base"))); | |
156 | ||
157 | phys_addr_t __mips_cm_l2sync_phys_base(void) | |
158 | { | |
159 | u32 base_reg; | |
160 | ||
161 | /* | |
162 | * If the L2-only sync region is already enabled then leave it at it's | |
163 | * current location. | |
164 | */ | |
165 | base_reg = read_gcr_l2_only_sync_base(); | |
166 | if (base_reg & CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN) | |
167 | return base_reg & CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE; | |
168 | ||
169 | /* Default to following the CM */ | |
170 | return mips_cm_phys_base() + MIPS_CM_GCR_SIZE; | |
171 | } | |
172 | ||
173 | phys_addr_t mips_cm_l2sync_phys_base(void) | |
174 | __attribute__((weak, alias("__mips_cm_l2sync_phys_base"))); | |
175 | ||
176 | static void mips_cm_probe_l2sync(void) | |
177 | { | |
178 | unsigned major_rev; | |
179 | phys_addr_t addr; | |
180 | ||
181 | /* L2-only sync was introduced with CM major revision 6 */ | |
182 | major_rev = (read_gcr_rev() & CM_GCR_REV_MAJOR) >> | |
183 | __ffs(CM_GCR_REV_MAJOR); | |
184 | if (major_rev < 6) | |
185 | return; | |
186 | ||
187 | /* Find a location for the L2 sync region */ | |
188 | addr = mips_cm_l2sync_phys_base(); | |
189 | BUG_ON((addr & CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE) != addr); | |
190 | if (!addr) | |
191 | return; | |
192 | ||
193 | /* Set the region base address & enable it */ | |
194 | write_gcr_l2_only_sync_base(addr | CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN); | |
195 | ||
196 | /* Map the region */ | |
197 | mips_cm_l2sync_base = ioremap_nocache(addr, MIPS_CM_L2SYNC_SIZE); | |
198 | } | |
199 | ||
200 | int mips_cm_probe(void) | |
201 | { | |
202 | phys_addr_t addr; | |
203 | u32 base_reg; | |
204 | unsigned cpu; | |
205 | ||
206 | /* | |
207 | * No need to probe again if we have already been | |
208 | * here before. | |
209 | */ | |
210 | if (mips_gcr_base) | |
211 | return 0; | |
212 | ||
213 | addr = mips_cm_phys_base(); | |
214 | BUG_ON((addr & CM_GCR_BASE_GCRBASE) != addr); | |
215 | if (!addr) | |
216 | return -ENODEV; | |
217 | ||
218 | mips_gcr_base = ioremap_nocache(addr, MIPS_CM_GCR_SIZE); | |
219 | if (!mips_gcr_base) | |
220 | return -ENXIO; | |
221 | ||
222 | /* sanity check that we're looking at a CM */ | |
223 | base_reg = read_gcr_base(); | |
224 | if ((base_reg & CM_GCR_BASE_GCRBASE) != addr) { | |
225 | pr_err("GCRs appear to have been moved (expected them at 0x%08lx)!\n", | |
226 | (unsigned long)addr); | |
227 | mips_gcr_base = NULL; | |
228 | return -ENODEV; | |
229 | } | |
230 | ||
231 | /* set default target to memory */ | |
232 | change_gcr_base(CM_GCR_BASE_CMDEFTGT, CM_GCR_BASE_CMDEFTGT_MEM); | |
233 | ||
234 | /* disable CM regions */ | |
235 | write_gcr_reg0_base(CM_GCR_REGn_BASE_BASEADDR); | |
236 | write_gcr_reg0_mask(CM_GCR_REGn_MASK_ADDRMASK); | |
237 | write_gcr_reg1_base(CM_GCR_REGn_BASE_BASEADDR); | |
238 | write_gcr_reg1_mask(CM_GCR_REGn_MASK_ADDRMASK); | |
239 | write_gcr_reg2_base(CM_GCR_REGn_BASE_BASEADDR); | |
240 | write_gcr_reg2_mask(CM_GCR_REGn_MASK_ADDRMASK); | |
241 | write_gcr_reg3_base(CM_GCR_REGn_BASE_BASEADDR); | |
242 | write_gcr_reg3_mask(CM_GCR_REGn_MASK_ADDRMASK); | |
243 | ||
244 | /* probe for an L2-only sync region */ | |
245 | mips_cm_probe_l2sync(); | |
246 | ||
247 | /* determine register width for this CM */ | |
248 | mips_cm_is64 = IS_ENABLED(CONFIG_64BIT) && (mips_cm_revision() >= CM_REV_CM3); | |
249 | ||
250 | for_each_possible_cpu(cpu) | |
251 | spin_lock_init(&per_cpu(cm_core_lock, cpu)); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | void mips_cm_lock_other(unsigned int cluster, unsigned int core, | |
257 | unsigned int vp, unsigned int block) | |
258 | { | |
259 | unsigned int curr_core, cm_rev; | |
260 | u32 val; | |
261 | ||
262 | cm_rev = mips_cm_revision(); | |
263 | preempt_disable(); | |
264 | ||
265 | if (cm_rev >= CM_REV_CM3) { | |
266 | val = core << __ffs(CM3_GCR_Cx_OTHER_CORE); | |
267 | val |= vp << __ffs(CM3_GCR_Cx_OTHER_VP); | |
268 | ||
269 | if (cm_rev >= CM_REV_CM3_5) { | |
270 | val |= CM_GCR_Cx_OTHER_CLUSTER_EN; | |
271 | val |= cluster << __ffs(CM_GCR_Cx_OTHER_CLUSTER); | |
272 | val |= block << __ffs(CM_GCR_Cx_OTHER_BLOCK); | |
273 | } else { | |
274 | WARN_ON(cluster != 0); | |
275 | WARN_ON(block != CM_GCR_Cx_OTHER_BLOCK_LOCAL); | |
276 | } | |
277 | ||
278 | /* | |
279 | * We need to disable interrupts in SMP systems in order to | |
280 | * ensure that we don't interrupt the caller with code which | |
281 | * may modify the redirect register. We do so here in a | |
282 | * slightly obscure way by using a spin lock, since this has | |
283 | * the neat property of also catching any nested uses of | |
284 | * mips_cm_lock_other() leading to a deadlock or a nice warning | |
285 | * with lockdep enabled. | |
286 | */ | |
287 | spin_lock_irqsave(this_cpu_ptr(&cm_core_lock), | |
288 | *this_cpu_ptr(&cm_core_lock_flags)); | |
289 | } else { | |
290 | WARN_ON(cluster != 0); | |
291 | WARN_ON(block != CM_GCR_Cx_OTHER_BLOCK_LOCAL); | |
292 | ||
293 | /* | |
294 | * We only have a GCR_CL_OTHER per core in systems with | |
295 | * CM 2.5 & older, so have to ensure other VP(E)s don't | |
296 | * race with us. | |
297 | */ | |
298 | curr_core = cpu_core(¤t_cpu_data); | |
299 | spin_lock_irqsave(&per_cpu(cm_core_lock, curr_core), | |
300 | per_cpu(cm_core_lock_flags, curr_core)); | |
301 | ||
302 | val = core << __ffs(CM_GCR_Cx_OTHER_CORENUM); | |
303 | } | |
304 | ||
305 | write_gcr_cl_other(val); | |
306 | ||
307 | /* | |
308 | * Ensure the core-other region reflects the appropriate core & | |
309 | * VP before any accesses to it occur. | |
310 | */ | |
311 | mb(); | |
312 | } | |
313 | ||
314 | void mips_cm_unlock_other(void) | |
315 | { | |
316 | unsigned int curr_core; | |
317 | ||
318 | if (mips_cm_revision() < CM_REV_CM3) { | |
319 | curr_core = cpu_core(¤t_cpu_data); | |
320 | spin_unlock_irqrestore(&per_cpu(cm_core_lock, curr_core), | |
321 | per_cpu(cm_core_lock_flags, curr_core)); | |
322 | } else { | |
323 | spin_unlock_irqrestore(this_cpu_ptr(&cm_core_lock), | |
324 | *this_cpu_ptr(&cm_core_lock_flags)); | |
325 | } | |
326 | ||
327 | preempt_enable(); | |
328 | } | |
329 | ||
330 | void mips_cm_error_report(void) | |
331 | { | |
332 | u64 cm_error, cm_addr, cm_other; | |
333 | unsigned long revision; | |
334 | int ocause, cause; | |
335 | char buf[256]; | |
336 | ||
337 | if (!mips_cm_present()) | |
338 | return; | |
339 | ||
340 | revision = mips_cm_revision(); | |
341 | cm_error = read_gcr_error_cause(); | |
342 | cm_addr = read_gcr_error_addr(); | |
343 | cm_other = read_gcr_error_mult(); | |
344 | ||
345 | if (revision < CM_REV_CM3) { /* CM2 */ | |
346 | cause = cm_error >> __ffs(CM_GCR_ERROR_CAUSE_ERRTYPE); | |
347 | ocause = cm_other >> __ffs(CM_GCR_ERROR_MULT_ERR2ND); | |
348 | ||
349 | if (!cause) | |
350 | return; | |
351 | ||
352 | if (cause < 16) { | |
353 | unsigned long cca_bits = (cm_error >> 15) & 7; | |
354 | unsigned long tr_bits = (cm_error >> 12) & 7; | |
355 | unsigned long cmd_bits = (cm_error >> 7) & 0x1f; | |
356 | unsigned long stag_bits = (cm_error >> 3) & 15; | |
357 | unsigned long sport_bits = (cm_error >> 0) & 7; | |
358 | ||
359 | snprintf(buf, sizeof(buf), | |
360 | "CCA=%lu TR=%s MCmd=%s STag=%lu " | |
361 | "SPort=%lu\n", cca_bits, cm2_tr[tr_bits], | |
362 | cm2_cmd[cmd_bits], stag_bits, sport_bits); | |
363 | } else { | |
364 | /* glob state & sresp together */ | |
365 | unsigned long c3_bits = (cm_error >> 18) & 7; | |
366 | unsigned long c2_bits = (cm_error >> 15) & 7; | |
367 | unsigned long c1_bits = (cm_error >> 12) & 7; | |
368 | unsigned long c0_bits = (cm_error >> 9) & 7; | |
369 | unsigned long sc_bit = (cm_error >> 8) & 1; | |
370 | unsigned long cmd_bits = (cm_error >> 3) & 0x1f; | |
371 | unsigned long sport_bits = (cm_error >> 0) & 7; | |
372 | ||
373 | snprintf(buf, sizeof(buf), | |
374 | "C3=%s C2=%s C1=%s C0=%s SC=%s " | |
375 | "MCmd=%s SPort=%lu\n", | |
376 | cm2_core[c3_bits], cm2_core[c2_bits], | |
377 | cm2_core[c1_bits], cm2_core[c0_bits], | |
378 | sc_bit ? "True" : "False", | |
379 | cm2_cmd[cmd_bits], sport_bits); | |
380 | } | |
381 | pr_err("CM_ERROR=%08llx %s <%s>\n", cm_error, | |
382 | cm2_causes[cause], buf); | |
383 | pr_err("CM_ADDR =%08llx\n", cm_addr); | |
384 | pr_err("CM_OTHER=%08llx %s\n", cm_other, cm2_causes[ocause]); | |
385 | } else { /* CM3 */ | |
386 | ulong core_id_bits, vp_id_bits, cmd_bits, cmd_group_bits; | |
387 | ulong cm3_cca_bits, mcp_bits, cm3_tr_bits, sched_bit; | |
388 | ||
389 | cause = cm_error >> __ffs64(CM3_GCR_ERROR_CAUSE_ERRTYPE); | |
390 | ocause = cm_other >> __ffs(CM_GCR_ERROR_MULT_ERR2ND); | |
391 | ||
392 | if (!cause) | |
393 | return; | |
394 | ||
395 | /* Used by cause == {1,2,3} */ | |
396 | core_id_bits = (cm_error >> 22) & 0xf; | |
397 | vp_id_bits = (cm_error >> 18) & 0xf; | |
398 | cmd_bits = (cm_error >> 14) & 0xf; | |
399 | cmd_group_bits = (cm_error >> 11) & 0xf; | |
400 | cm3_cca_bits = (cm_error >> 8) & 7; | |
401 | mcp_bits = (cm_error >> 5) & 0xf; | |
402 | cm3_tr_bits = (cm_error >> 1) & 0xf; | |
403 | sched_bit = cm_error & 0x1; | |
404 | ||
405 | if (cause == 1 || cause == 3) { /* Tag ECC */ | |
406 | unsigned long tag_ecc = (cm_error >> 57) & 0x1; | |
407 | unsigned long tag_way_bits = (cm_error >> 29) & 0xffff; | |
408 | unsigned long dword_bits = (cm_error >> 49) & 0xff; | |
409 | unsigned long data_way_bits = (cm_error >> 45) & 0xf; | |
410 | unsigned long data_sets_bits = (cm_error >> 29) & 0xfff; | |
411 | unsigned long bank_bit = (cm_error >> 28) & 0x1; | |
412 | snprintf(buf, sizeof(buf), | |
413 | "%s ECC Error: Way=%lu (DWORD=%lu, Sets=%lu)" | |
414 | "Bank=%lu CoreID=%lu VPID=%lu Command=%s" | |
415 | "Command Group=%s CCA=%lu MCP=%d" | |
416 | "Transaction type=%s Scheduler=%lu\n", | |
417 | tag_ecc ? "TAG" : "DATA", | |
418 | tag_ecc ? (unsigned long)ffs(tag_way_bits) - 1 : | |
419 | data_way_bits, bank_bit, dword_bits, | |
420 | data_sets_bits, | |
421 | core_id_bits, vp_id_bits, | |
422 | cm3_cmd[cmd_bits], | |
423 | cm3_cmd_group[cmd_group_bits], | |
424 | cm3_cca_bits, 1 << mcp_bits, | |
425 | cm3_tr[cm3_tr_bits], sched_bit); | |
426 | } else if (cause == 2) { | |
427 | unsigned long data_error_type = (cm_error >> 41) & 0xfff; | |
428 | unsigned long data_decode_cmd = (cm_error >> 37) & 0xf; | |
429 | unsigned long data_decode_group = (cm_error >> 34) & 0x7; | |
430 | unsigned long data_decode_destination_id = (cm_error >> 28) & 0x3f; | |
431 | ||
432 | snprintf(buf, sizeof(buf), | |
433 | "Decode Request Error: Type=%lu, Command=%lu" | |
434 | "Command Group=%lu Destination ID=%lu" | |
435 | "CoreID=%lu VPID=%lu Command=%s" | |
436 | "Command Group=%s CCA=%lu MCP=%d" | |
437 | "Transaction type=%s Scheduler=%lu\n", | |
438 | data_error_type, data_decode_cmd, | |
439 | data_decode_group, data_decode_destination_id, | |
440 | core_id_bits, vp_id_bits, | |
441 | cm3_cmd[cmd_bits], | |
442 | cm3_cmd_group[cmd_group_bits], | |
443 | cm3_cca_bits, 1 << mcp_bits, | |
444 | cm3_tr[cm3_tr_bits], sched_bit); | |
445 | } else { | |
446 | buf[0] = 0; | |
447 | } | |
448 | ||
449 | pr_err("CM_ERROR=%llx %s <%s>\n", cm_error, | |
450 | cm3_causes[cause], buf); | |
451 | pr_err("CM_ADDR =%llx\n", cm_addr); | |
452 | pr_err("CM_OTHER=%llx %s\n", cm_other, cm3_causes[ocause]); | |
453 | } | |
454 | ||
455 | /* reprime cause register */ | |
456 | write_gcr_error_cause(cm_error); | |
457 | } |