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Commit | Line | Data |
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95d6976d | 1 | /* |
8ea2ddff | 2 | * ARC Cache Management |
95d6976d | 3 | * |
8ea2ddff | 4 | * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com) |
95d6976d VG |
5 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
95d6976d VG |
10 | */ |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/cache.h> | |
16 | #include <linux/mmu_context.h> | |
17 | #include <linux/syscalls.h> | |
18 | #include <linux/uaccess.h> | |
4102b533 | 19 | #include <linux/pagemap.h> |
95d6976d VG |
20 | #include <asm/cacheflush.h> |
21 | #include <asm/cachectl.h> | |
22 | #include <asm/setup.h> | |
23 | ||
0d77117f VG |
24 | #ifdef CONFIG_ISA_ARCV2 |
25 | #define USE_RGN_FLSH 1 | |
26 | #endif | |
27 | ||
795f4558 | 28 | static int l2_line_sz; |
cf986d47 | 29 | static int ioc_exists; |
d0e73e2a | 30 | int slc_enable = 1, ioc_enable = 1; |
deaf7565 | 31 | unsigned long perip_base = ARC_UNCACHED_ADDR_SPACE; /* legacy value for boot */ |
26c01c49 | 32 | unsigned long perip_end = 0xFFFFFFFF; /* legacy value */ |
795f4558 | 33 | |
28b4af72 | 34 | void (*_cache_line_loop_ic_fn)(phys_addr_t paddr, unsigned long vaddr, |
7d3d162b | 35 | unsigned long sz, const int op, const int full_page); |
bcc4d65a | 36 | |
f5db19e9 VG |
37 | void (*__dma_cache_wback_inv)(phys_addr_t start, unsigned long sz); |
38 | void (*__dma_cache_inv)(phys_addr_t start, unsigned long sz); | |
39 | void (*__dma_cache_wback)(phys_addr_t start, unsigned long sz); | |
f2b0b25a | 40 | |
c3441edd | 41 | char *arc_cache_mumbojumbo(int c, char *buf, int len) |
af617428 VG |
42 | { |
43 | int n = 0; | |
d1f317d8 | 44 | struct cpuinfo_arc_cache *p; |
af617428 | 45 | |
da40ff48 | 46 | #define PR_CACHE(p, cfg, str) \ |
f64915be | 47 | if (!(p)->line_len) \ |
af617428 VG |
48 | n += scnprintf(buf + n, len - n, str"\t\t: N/A\n"); \ |
49 | else \ | |
50 | n += scnprintf(buf + n, len - n, \ | |
da40ff48 VG |
51 | str"\t\t: %uK, %dway/set, %uB Line, %s%s%s\n", \ |
52 | (p)->sz_k, (p)->assoc, (p)->line_len, \ | |
53 | (p)->vipt ? "VIPT" : "PIPT", \ | |
54 | (p)->alias ? " aliasing" : "", \ | |
964cf28f | 55 | IS_USED_CFG(cfg)); |
af617428 | 56 | |
da40ff48 VG |
57 | PR_CACHE(&cpuinfo_arc700[c].icache, CONFIG_ARC_HAS_ICACHE, "I-Cache"); |
58 | PR_CACHE(&cpuinfo_arc700[c].dcache, CONFIG_ARC_HAS_DCACHE, "D-Cache"); | |
af617428 | 59 | |
d1f317d8 | 60 | p = &cpuinfo_arc700[c].slc; |
f64915be | 61 | if (p->line_len) |
d1f317d8 | 62 | n += scnprintf(buf + n, len - n, |
79335a2c VG |
63 | "SLC\t\t: %uK, %uB Line%s\n", |
64 | p->sz_k, p->line_len, IS_USED_RUN(slc_enable)); | |
d1f317d8 | 65 | |
711c1f26 VG |
66 | n += scnprintf(buf + n, len - n, "Peripherals\t: %#lx%s%s\n", |
67 | perip_base, | |
68 | IS_AVAIL3(ioc_exists, ioc_enable, ", IO-Coherency ")); | |
f2b0b25a | 69 | |
af617428 VG |
70 | return buf; |
71 | } | |
72 | ||
95d6976d VG |
73 | /* |
74 | * Read the Cache Build Confuration Registers, Decode them and save into | |
75 | * the cpuinfo structure for later use. | |
76 | * No Validation done here, simply read/convert the BCRs | |
77 | */ | |
fd0881a2 | 78 | static void read_decode_cache_bcr_arcv2(int cpu) |
95d6976d | 79 | { |
fd0881a2 | 80 | struct cpuinfo_arc_cache *p_slc = &cpuinfo_arc700[cpu].slc; |
d1f317d8 VG |
81 | struct bcr_generic sbcr; |
82 | ||
83 | struct bcr_slc_cfg { | |
84 | #ifdef CONFIG_CPU_BIG_ENDIAN | |
85 | unsigned int pad:24, way:2, lsz:2, sz:4; | |
86 | #else | |
87 | unsigned int sz:4, lsz:2, way:2, pad:24; | |
88 | #endif | |
89 | } slc_cfg; | |
90 | ||
f2b0b25a AB |
91 | struct bcr_clust_cfg { |
92 | #ifdef CONFIG_CPU_BIG_ENDIAN | |
93 | unsigned int pad:7, c:1, num_entries:8, num_cores:8, ver:8; | |
94 | #else | |
95 | unsigned int ver:8, num_cores:8, num_entries:8, c:1, pad:7; | |
96 | #endif | |
97 | } cbcr; | |
98 | ||
26c01c49 VG |
99 | struct bcr_volatile { |
100 | #ifdef CONFIG_CPU_BIG_ENDIAN | |
101 | unsigned int start:4, limit:4, pad:22, order:1, disable:1; | |
102 | #else | |
103 | unsigned int disable:1, order:1, pad:22, limit:4, start:4; | |
104 | #endif | |
105 | } vol; | |
106 | ||
107 | ||
fd0881a2 VG |
108 | READ_BCR(ARC_REG_SLC_BCR, sbcr); |
109 | if (sbcr.ver) { | |
110 | READ_BCR(ARC_REG_SLC_CFG, slc_cfg); | |
fd0881a2 VG |
111 | p_slc->sz_k = 128 << slc_cfg.sz; |
112 | l2_line_sz = p_slc->line_len = (slc_cfg.lsz == 0) ? 128 : 64; | |
113 | } | |
114 | ||
115 | READ_BCR(ARC_REG_CLUSTER_BCR, cbcr); | |
cf986d47 | 116 | if (cbcr.c) |
fd0881a2 | 117 | ioc_exists = 1; |
cf986d47 VG |
118 | else |
119 | ioc_enable = 0; | |
deaf7565 | 120 | |
26c01c49 VG |
121 | /* HS 2.0 didn't have AUX_VOL */ |
122 | if (cpuinfo_arc700[cpu].core.family > 0x51) { | |
123 | READ_BCR(AUX_VOL, vol); | |
124 | perip_base = vol.start << 28; | |
125 | /* HS 3.0 has limit and strict-ordering fields */ | |
126 | if (cpuinfo_arc700[cpu].core.family > 0x52) | |
127 | perip_end = (vol.limit << 28) - 1; | |
128 | } | |
fd0881a2 VG |
129 | } |
130 | ||
131 | void read_decode_cache_bcr(void) | |
132 | { | |
133 | struct cpuinfo_arc_cache *p_ic, *p_dc; | |
134 | unsigned int cpu = smp_processor_id(); | |
135 | struct bcr_cache { | |
136 | #ifdef CONFIG_CPU_BIG_ENDIAN | |
137 | unsigned int pad:12, line_len:4, sz:4, config:4, ver:8; | |
138 | #else | |
139 | unsigned int ver:8, config:4, sz:4, line_len:4, pad:12; | |
140 | #endif | |
141 | } ibcr, dbcr; | |
142 | ||
95d6976d VG |
143 | p_ic = &cpuinfo_arc700[cpu].icache; |
144 | READ_BCR(ARC_REG_IC_BCR, ibcr); | |
145 | ||
da40ff48 VG |
146 | if (!ibcr.ver) |
147 | goto dc_chk; | |
148 | ||
d1f317d8 VG |
149 | if (ibcr.ver <= 3) { |
150 | BUG_ON(ibcr.config != 3); | |
151 | p_ic->assoc = 2; /* Fixed to 2w set assoc */ | |
152 | } else if (ibcr.ver >= 4) { | |
153 | p_ic->assoc = 1 << ibcr.config; /* 1,2,4,8 */ | |
154 | } | |
155 | ||
95d6976d | 156 | p_ic->line_len = 8 << ibcr.line_len; |
da40ff48 | 157 | p_ic->sz_k = 1 << (ibcr.sz - 1); |
da40ff48 VG |
158 | p_ic->vipt = 1; |
159 | p_ic->alias = p_ic->sz_k/p_ic->assoc/TO_KB(PAGE_SIZE) > 1; | |
95d6976d | 160 | |
da40ff48 | 161 | dc_chk: |
95d6976d VG |
162 | p_dc = &cpuinfo_arc700[cpu].dcache; |
163 | READ_BCR(ARC_REG_DC_BCR, dbcr); | |
164 | ||
da40ff48 | 165 | if (!dbcr.ver) |
d1f317d8 VG |
166 | goto slc_chk; |
167 | ||
168 | if (dbcr.ver <= 3) { | |
169 | BUG_ON(dbcr.config != 2); | |
170 | p_dc->assoc = 4; /* Fixed to 4w set assoc */ | |
171 | p_dc->vipt = 1; | |
172 | p_dc->alias = p_dc->sz_k/p_dc->assoc/TO_KB(PAGE_SIZE) > 1; | |
173 | } else if (dbcr.ver >= 4) { | |
174 | p_dc->assoc = 1 << dbcr.config; /* 1,2,4,8 */ | |
175 | p_dc->vipt = 0; | |
176 | p_dc->alias = 0; /* PIPT so can't VIPT alias */ | |
177 | } | |
da40ff48 | 178 | |
95d6976d | 179 | p_dc->line_len = 16 << dbcr.line_len; |
da40ff48 | 180 | p_dc->sz_k = 1 << (dbcr.sz - 1); |
d1f317d8 VG |
181 | |
182 | slc_chk: | |
fd0881a2 VG |
183 | if (is_isa_arcv2()) |
184 | read_decode_cache_bcr_arcv2(cpu); | |
95d6976d VG |
185 | } |
186 | ||
187 | /* | |
8ea2ddff | 188 | * Line Operation on {I,D}-Cache |
95d6976d | 189 | */ |
95d6976d VG |
190 | |
191 | #define OP_INV 0x1 | |
192 | #define OP_FLUSH 0x2 | |
193 | #define OP_FLUSH_N_INV 0x3 | |
bd12976c VG |
194 | #define OP_INV_IC 0x4 |
195 | ||
196 | /* | |
8ea2ddff VG |
197 | * I-Cache Aliasing in ARC700 VIPT caches (MMU v1-v3) |
198 | * | |
199 | * ARC VIPT I-cache uses vaddr to index into cache and paddr to match the tag. | |
200 | * The orig Cache Management Module "CDU" only required paddr to invalidate a | |
201 | * certain line since it sufficed as index in Non-Aliasing VIPT cache-geometry. | |
202 | * Infact for distinct V1,V2,P: all of {V1-P},{V2-P},{P-P} would end up fetching | |
203 | * the exact same line. | |
204 | * | |
205 | * However for larger Caches (way-size > page-size) - i.e. in Aliasing config, | |
206 | * paddr alone could not be used to correctly index the cache. | |
207 | * | |
208 | * ------------------ | |
209 | * MMU v1/v2 (Fixed Page Size 8k) | |
210 | * ------------------ | |
211 | * The solution was to provide CDU with these additonal vaddr bits. These | |
212 | * would be bits [x:13], x would depend on cache-geometry, 13 comes from | |
213 | * standard page size of 8k. | |
214 | * H/w folks chose [17:13] to be a future safe range, and moreso these 5 bits | |
215 | * of vaddr could easily be "stuffed" in the paddr as bits [4:0] since the | |
216 | * orig 5 bits of paddr were anyways ignored by CDU line ops, as they | |
217 | * represent the offset within cache-line. The adv of using this "clumsy" | |
218 | * interface for additional info was no new reg was needed in CDU programming | |
219 | * model. | |
220 | * | |
221 | * 17:13 represented the max num of bits passable, actual bits needed were | |
222 | * fewer, based on the num-of-aliases possible. | |
223 | * -for 2 alias possibility, only bit 13 needed (32K cache) | |
224 | * -for 4 alias possibility, bits 14:13 needed (64K cache) | |
225 | * | |
226 | * ------------------ | |
227 | * MMU v3 | |
228 | * ------------------ | |
229 | * This ver of MMU supports variable page sizes (1k-16k): although Linux will | |
230 | * only support 8k (default), 16k and 4k. | |
2547476a | 231 | * However from hardware perspective, smaller page sizes aggravate aliasing |
8ea2ddff VG |
232 | * meaning more vaddr bits needed to disambiguate the cache-line-op ; |
233 | * the existing scheme of piggybacking won't work for certain configurations. | |
234 | * Two new registers IC_PTAG and DC_PTAG inttoduced. | |
235 | * "tag" bits are provided in PTAG, index bits in existing IVIL/IVDL/FLDL regs | |
bd12976c | 236 | */ |
8ea2ddff | 237 | |
11e14896 | 238 | static inline |
28b4af72 | 239 | void __cache_line_loop_v2(phys_addr_t paddr, unsigned long vaddr, |
7d3d162b | 240 | unsigned long sz, const int op, const int full_page) |
bd12976c | 241 | { |
11e14896 | 242 | unsigned int aux_cmd; |
bd12976c VG |
243 | int num_lines; |
244 | ||
8ea2ddff | 245 | if (op == OP_INV_IC) { |
bd12976c | 246 | aux_cmd = ARC_REG_IC_IVIL; |
11e14896 | 247 | } else { |
bd12976c | 248 | /* d$ cmd: INV (discard or wback-n-discard) OR FLUSH (wback) */ |
8ea2ddff | 249 | aux_cmd = op & OP_INV ? ARC_REG_DC_IVDL : ARC_REG_DC_FLDL; |
bd12976c VG |
250 | } |
251 | ||
252 | /* Ensure we properly floor/ceil the non-line aligned/sized requests | |
253 | * and have @paddr - aligned to cache line and integral @num_lines. | |
254 | * This however can be avoided for page sized since: | |
255 | * -@paddr will be cache-line aligned already (being page aligned) | |
256 | * -@sz will be integral multiple of line size (being page sized). | |
257 | */ | |
11e14896 | 258 | if (!full_page) { |
bd12976c VG |
259 | sz += paddr & ~CACHE_LINE_MASK; |
260 | paddr &= CACHE_LINE_MASK; | |
261 | vaddr &= CACHE_LINE_MASK; | |
262 | } | |
263 | ||
264 | num_lines = DIV_ROUND_UP(sz, L1_CACHE_BYTES); | |
265 | ||
bd12976c VG |
266 | /* MMUv2 and before: paddr contains stuffed vaddrs bits */ |
267 | paddr |= (vaddr >> PAGE_SHIFT) & 0x1F; | |
11e14896 VG |
268 | |
269 | while (num_lines-- > 0) { | |
270 | write_aux_reg(aux_cmd, paddr); | |
271 | paddr += L1_CACHE_BYTES; | |
272 | } | |
273 | } | |
274 | ||
5a364c2a VG |
275 | /* |
276 | * For ARC700 MMUv3 I-cache and D-cache flushes | |
fa84d731 VG |
277 | * - ARC700 programming model requires paddr and vaddr be passed in seperate |
278 | * AUX registers (*_IV*L and *_PTAG respectively) irrespective of whether the | |
279 | * caches actually alias or not. | |
280 | * - For HS38, only the aliasing I-cache configuration uses the PTAG reg | |
281 | * (non aliasing I-cache version doesn't; while D-cache can't possibly alias) | |
5a364c2a | 282 | */ |
11e14896 | 283 | static inline |
28b4af72 | 284 | void __cache_line_loop_v3(phys_addr_t paddr, unsigned long vaddr, |
7d3d162b | 285 | unsigned long sz, const int op, const int full_page) |
11e14896 VG |
286 | { |
287 | unsigned int aux_cmd, aux_tag; | |
288 | int num_lines; | |
11e14896 VG |
289 | |
290 | if (op == OP_INV_IC) { | |
291 | aux_cmd = ARC_REG_IC_IVIL; | |
292 | aux_tag = ARC_REG_IC_PTAG; | |
293 | } else { | |
294 | aux_cmd = op & OP_INV ? ARC_REG_DC_IVDL : ARC_REG_DC_FLDL; | |
295 | aux_tag = ARC_REG_DC_PTAG; | |
296 | } | |
297 | ||
298 | /* Ensure we properly floor/ceil the non-line aligned/sized requests | |
299 | * and have @paddr - aligned to cache line and integral @num_lines. | |
300 | * This however can be avoided for page sized since: | |
301 | * -@paddr will be cache-line aligned already (being page aligned) | |
302 | * -@sz will be integral multiple of line size (being page sized). | |
303 | */ | |
304 | if (!full_page) { | |
305 | sz += paddr & ~CACHE_LINE_MASK; | |
306 | paddr &= CACHE_LINE_MASK; | |
307 | vaddr &= CACHE_LINE_MASK; | |
308 | } | |
309 | num_lines = DIV_ROUND_UP(sz, L1_CACHE_BYTES); | |
310 | ||
311 | /* | |
312 | * MMUv3, cache ops require paddr in PTAG reg | |
313 | * if V-P const for loop, PTAG can be written once outside loop | |
314 | */ | |
315 | if (full_page) | |
b053940d | 316 | write_aux_reg(aux_tag, paddr); |
bd12976c | 317 | |
5a364c2a VG |
318 | /* |
319 | * This is technically for MMU v4, using the MMU v3 programming model | |
2547476a | 320 | * Special work for HS38 aliasing I-cache configuration with PAE40 |
5a364c2a VG |
321 | * - upper 8 bits of paddr need to be written into PTAG_HI |
322 | * - (and needs to be written before the lower 32 bits) | |
323 | * Note that PTAG_HI is hoisted outside the line loop | |
324 | */ | |
325 | if (is_pae40_enabled() && op == OP_INV_IC) | |
326 | write_aux_reg(ARC_REG_IC_PTAG_HI, (u64)paddr >> 32); | |
327 | ||
bd12976c | 328 | while (num_lines-- > 0) { |
11e14896 | 329 | if (!full_page) { |
d4599baf VG |
330 | write_aux_reg(aux_tag, paddr); |
331 | paddr += L1_CACHE_BYTES; | |
332 | } | |
bd12976c VG |
333 | |
334 | write_aux_reg(aux_cmd, vaddr); | |
335 | vaddr += L1_CACHE_BYTES; | |
bd12976c VG |
336 | } |
337 | } | |
95d6976d | 338 | |
0d77117f VG |
339 | #ifndef USE_RGN_FLSH |
340 | ||
d1f317d8 | 341 | /* |
5a364c2a VG |
342 | * In HS38x (MMU v4), I-cache is VIPT (can alias), D-cache is PIPT |
343 | * Here's how cache ops are implemented | |
d1f317d8 | 344 | * |
5a364c2a VG |
345 | * - D-cache: only paddr needed (in DC_IVDL/DC_FLDL) |
346 | * - I-cache Non Aliasing: Despite VIPT, only paddr needed (in IC_IVIL) | |
347 | * - I-cache Aliasing: Both vaddr and paddr needed (in IC_IVIL, IC_PTAG | |
348 | * respectively, similar to MMU v3 programming model, hence | |
349 | * __cache_line_loop_v3() is used) | |
350 | * | |
351 | * If PAE40 is enabled, independent of aliasing considerations, the higher bits | |
352 | * needs to be written into PTAG_HI | |
d1f317d8 VG |
353 | */ |
354 | static inline | |
28b4af72 | 355 | void __cache_line_loop_v4(phys_addr_t paddr, unsigned long vaddr, |
7d3d162b | 356 | unsigned long sz, const int op, const int full_page) |
d1f317d8 VG |
357 | { |
358 | unsigned int aux_cmd; | |
359 | int num_lines; | |
d1f317d8 | 360 | |
7d3d162b | 361 | if (op == OP_INV_IC) { |
d1f317d8 VG |
362 | aux_cmd = ARC_REG_IC_IVIL; |
363 | } else { | |
364 | /* d$ cmd: INV (discard or wback-n-discard) OR FLUSH (wback) */ | |
7d3d162b | 365 | aux_cmd = op & OP_INV ? ARC_REG_DC_IVDL : ARC_REG_DC_FLDL; |
d1f317d8 VG |
366 | } |
367 | ||
368 | /* Ensure we properly floor/ceil the non-line aligned/sized requests | |
369 | * and have @paddr - aligned to cache line and integral @num_lines. | |
370 | * This however can be avoided for page sized since: | |
371 | * -@paddr will be cache-line aligned already (being page aligned) | |
372 | * -@sz will be integral multiple of line size (being page sized). | |
373 | */ | |
7d3d162b | 374 | if (!full_page) { |
d1f317d8 VG |
375 | sz += paddr & ~CACHE_LINE_MASK; |
376 | paddr &= CACHE_LINE_MASK; | |
377 | } | |
378 | ||
379 | num_lines = DIV_ROUND_UP(sz, L1_CACHE_BYTES); | |
380 | ||
5a364c2a VG |
381 | /* |
382 | * For HS38 PAE40 configuration | |
383 | * - upper 8 bits of paddr need to be written into PTAG_HI | |
384 | * - (and needs to be written before the lower 32 bits) | |
385 | */ | |
386 | if (is_pae40_enabled()) { | |
7d3d162b | 387 | if (op == OP_INV_IC) |
5a364c2a VG |
388 | /* |
389 | * Non aliasing I-cache in HS38, | |
390 | * aliasing I-cache handled in __cache_line_loop_v3() | |
391 | */ | |
392 | write_aux_reg(ARC_REG_IC_PTAG_HI, (u64)paddr >> 32); | |
393 | else | |
394 | write_aux_reg(ARC_REG_DC_PTAG_HI, (u64)paddr >> 32); | |
395 | } | |
396 | ||
d1f317d8 VG |
397 | while (num_lines-- > 0) { |
398 | write_aux_reg(aux_cmd, paddr); | |
399 | paddr += L1_CACHE_BYTES; | |
400 | } | |
401 | } | |
402 | ||
0d77117f VG |
403 | #else |
404 | ||
405 | /* | |
406 | * optimized flush operation which takes a region as opposed to iterating per line | |
407 | */ | |
408 | static inline | |
409 | void __cache_line_loop_v4(phys_addr_t paddr, unsigned long vaddr, | |
410 | unsigned long sz, const int op, const int full_page) | |
411 | { | |
ee40bd1e | 412 | unsigned int s, e; |
0d77117f VG |
413 | |
414 | /* Only for Non aliasing I-cache in HS38 */ | |
415 | if (op == OP_INV_IC) { | |
416 | s = ARC_REG_IC_IVIR; | |
417 | e = ARC_REG_IC_ENDR; | |
418 | } else { | |
419 | s = ARC_REG_DC_STARTR; | |
420 | e = ARC_REG_DC_ENDR; | |
421 | } | |
422 | ||
423 | if (!full_page) { | |
424 | /* for any leading gap between @paddr and start of cache line */ | |
425 | sz += paddr & ~CACHE_LINE_MASK; | |
426 | paddr &= CACHE_LINE_MASK; | |
427 | ||
428 | /* | |
429 | * account for any trailing gap to end of cache line | |
430 | * this is equivalent to DIV_ROUND_UP() in line ops above | |
431 | */ | |
432 | sz += L1_CACHE_BYTES - 1; | |
433 | } | |
434 | ||
435 | if (is_pae40_enabled()) { | |
436 | /* TBD: check if crossing 4TB boundary */ | |
437 | if (op == OP_INV_IC) | |
438 | write_aux_reg(ARC_REG_IC_PTAG_HI, (u64)paddr >> 32); | |
439 | else | |
440 | write_aux_reg(ARC_REG_DC_PTAG_HI, (u64)paddr >> 32); | |
441 | } | |
442 | ||
0d77117f VG |
443 | /* ENDR needs to be set ahead of START */ |
444 | write_aux_reg(e, paddr + sz); /* ENDR is exclusive */ | |
445 | write_aux_reg(s, paddr); | |
446 | ||
447 | /* caller waits on DC_CTRL.FS */ | |
448 | } | |
449 | ||
450 | #endif | |
451 | ||
11e14896 VG |
452 | #if (CONFIG_ARC_MMU_VER < 3) |
453 | #define __cache_line_loop __cache_line_loop_v2 | |
454 | #elif (CONFIG_ARC_MMU_VER == 3) | |
455 | #define __cache_line_loop __cache_line_loop_v3 | |
d1f317d8 VG |
456 | #elif (CONFIG_ARC_MMU_VER > 3) |
457 | #define __cache_line_loop __cache_line_loop_v4 | |
11e14896 VG |
458 | #endif |
459 | ||
95d6976d VG |
460 | #ifdef CONFIG_ARC_HAS_DCACHE |
461 | ||
462 | /*************************************************************** | |
463 | * Machine specific helpers for Entire D-Cache or Per Line ops | |
464 | */ | |
465 | ||
ee40bd1e VG |
466 | #ifndef USE_RGN_FLSH |
467 | /* | |
468 | * this version avoids extra read/write of DC_CTRL for flush or invalid ops | |
469 | * in the non region flush regime (such as for ARCompact) | |
470 | */ | |
6c310681 | 471 | static inline void __before_dc_op(const int op) |
95d6976d | 472 | { |
1b1a22b1 VG |
473 | if (op == OP_FLUSH_N_INV) { |
474 | /* Dcache provides 2 cmd: FLUSH or INV | |
475 | * INV inturn has sub-modes: DISCARD or FLUSH-BEFORE | |
476 | * flush-n-inv is achieved by INV cmd but with IM=1 | |
477 | * So toggle INV sub-mode depending on op request and default | |
478 | */ | |
6c310681 VG |
479 | const unsigned int ctl = ARC_REG_DC_CTRL; |
480 | write_aux_reg(ctl, read_aux_reg(ctl) | DC_CTRL_INV_MODE_FLUSH); | |
1b1a22b1 | 481 | } |
1b1a22b1 VG |
482 | } |
483 | ||
ee40bd1e VG |
484 | #else |
485 | ||
486 | static inline void __before_dc_op(const int op) | |
487 | { | |
488 | const unsigned int ctl = ARC_REG_DC_CTRL; | |
489 | unsigned int val = read_aux_reg(ctl); | |
490 | ||
491 | if (op == OP_FLUSH_N_INV) { | |
492 | val |= DC_CTRL_INV_MODE_FLUSH; | |
493 | } | |
494 | ||
495 | if (op != OP_INV_IC) { | |
496 | /* | |
497 | * Flush / Invalidate is provided by DC_CTRL.RNG_OP 0 or 1 | |
498 | * combined Flush-n-invalidate uses DC_CTRL.IM = 1 set above | |
499 | */ | |
500 | val &= ~DC_CTRL_RGN_OP_MSK; | |
501 | if (op & OP_INV) | |
502 | val |= DC_CTRL_RGN_OP_INV; | |
503 | } | |
504 | write_aux_reg(ctl, val); | |
505 | } | |
506 | ||
507 | #endif | |
508 | ||
509 | ||
6c310681 | 510 | static inline void __after_dc_op(const int op) |
1b1a22b1 | 511 | { |
6c310681 VG |
512 | if (op & OP_FLUSH) { |
513 | const unsigned int ctl = ARC_REG_DC_CTRL; | |
514 | unsigned int reg; | |
1b1a22b1 | 515 | |
6c310681 VG |
516 | /* flush / flush-n-inv both wait */ |
517 | while ((reg = read_aux_reg(ctl)) & DC_CTRL_FLUSH_STATUS) | |
518 | ; | |
519 | ||
520 | /* Switch back to default Invalidate mode */ | |
521 | if (op == OP_FLUSH_N_INV) | |
522 | write_aux_reg(ctl, reg & ~DC_CTRL_INV_MODE_FLUSH); | |
523 | } | |
95d6976d VG |
524 | } |
525 | ||
526 | /* | |
527 | * Operation on Entire D-Cache | |
8ea2ddff | 528 | * @op = {OP_INV, OP_FLUSH, OP_FLUSH_N_INV} |
95d6976d VG |
529 | * Note that constant propagation ensures all the checks are gone |
530 | * in generated code | |
531 | */ | |
8ea2ddff | 532 | static inline void __dc_entire_op(const int op) |
95d6976d | 533 | { |
95d6976d VG |
534 | int aux; |
535 | ||
6c310681 | 536 | __before_dc_op(op); |
95d6976d | 537 | |
8ea2ddff | 538 | if (op & OP_INV) /* Inv or flush-n-inv use same cmd reg */ |
95d6976d VG |
539 | aux = ARC_REG_DC_IVDC; |
540 | else | |
541 | aux = ARC_REG_DC_FLSH; | |
542 | ||
543 | write_aux_reg(aux, 0x1); | |
544 | ||
6c310681 | 545 | __after_dc_op(op); |
95d6976d VG |
546 | } |
547 | ||
8c47f83b VG |
548 | static inline void __dc_disable(void) |
549 | { | |
550 | const int r = ARC_REG_DC_CTRL; | |
551 | ||
552 | __dc_entire_op(OP_FLUSH_N_INV); | |
553 | write_aux_reg(r, read_aux_reg(r) | DC_CTRL_DIS); | |
554 | } | |
555 | ||
556 | static void __dc_enable(void) | |
557 | { | |
558 | const int r = ARC_REG_DC_CTRL; | |
559 | ||
560 | write_aux_reg(r, read_aux_reg(r) & ~DC_CTRL_DIS); | |
561 | } | |
562 | ||
4102b533 | 563 | /* For kernel mappings cache operation: index is same as paddr */ |
6ec18a81 VG |
564 | #define __dc_line_op_k(p, sz, op) __dc_line_op(p, p, sz, op) |
565 | ||
95d6976d | 566 | /* |
8ea2ddff | 567 | * D-Cache Line ops: Per Line INV (discard or wback+discard) or FLUSH (wback) |
95d6976d | 568 | */ |
28b4af72 | 569 | static inline void __dc_line_op(phys_addr_t paddr, unsigned long vaddr, |
8ea2ddff | 570 | unsigned long sz, const int op) |
95d6976d | 571 | { |
7d3d162b | 572 | const int full_page = __builtin_constant_p(sz) && sz == PAGE_SIZE; |
1b1a22b1 | 573 | unsigned long flags; |
95d6976d VG |
574 | |
575 | local_irq_save(flags); | |
576 | ||
6c310681 | 577 | __before_dc_op(op); |
95d6976d | 578 | |
7d3d162b | 579 | __cache_line_loop(paddr, vaddr, sz, op, full_page); |
95d6976d | 580 | |
6c310681 | 581 | __after_dc_op(op); |
95d6976d VG |
582 | |
583 | local_irq_restore(flags); | |
584 | } | |
585 | ||
586 | #else | |
587 | ||
8ea2ddff | 588 | #define __dc_entire_op(op) |
8c47f83b VG |
589 | #define __dc_disable() |
590 | #define __dc_enable() | |
8ea2ddff VG |
591 | #define __dc_line_op(paddr, vaddr, sz, op) |
592 | #define __dc_line_op_k(paddr, sz, op) | |
95d6976d VG |
593 | |
594 | #endif /* CONFIG_ARC_HAS_DCACHE */ | |
595 | ||
95d6976d VG |
596 | #ifdef CONFIG_ARC_HAS_ICACHE |
597 | ||
af5abf1b VG |
598 | static inline void __ic_entire_inv(void) |
599 | { | |
600 | write_aux_reg(ARC_REG_IC_IVIC, 1); | |
601 | read_aux_reg(ARC_REG_IC_CTRL); /* blocks */ | |
602 | } | |
603 | ||
604 | static inline void | |
28b4af72 | 605 | __ic_line_inv_vaddr_local(phys_addr_t paddr, unsigned long vaddr, |
af5abf1b | 606 | unsigned long sz) |
95d6976d | 607 | { |
7d3d162b | 608 | const int full_page = __builtin_constant_p(sz) && sz == PAGE_SIZE; |
95d6976d | 609 | unsigned long flags; |
95d6976d VG |
610 | |
611 | local_irq_save(flags); | |
7d3d162b | 612 | (*_cache_line_loop_ic_fn)(paddr, vaddr, sz, OP_INV_IC, full_page); |
95d6976d VG |
613 | local_irq_restore(flags); |
614 | } | |
615 | ||
af5abf1b VG |
616 | #ifndef CONFIG_SMP |
617 | ||
618 | #define __ic_line_inv_vaddr(p, v, s) __ic_line_inv_vaddr_local(p, v, s) | |
619 | ||
620 | #else | |
336e199e | 621 | |
af5abf1b | 622 | struct ic_inv_args { |
28b4af72 | 623 | phys_addr_t paddr, vaddr; |
2328af0c VG |
624 | int sz; |
625 | }; | |
626 | ||
627 | static void __ic_line_inv_vaddr_helper(void *info) | |
628 | { | |
014018e0 | 629 | struct ic_inv_args *ic_inv = info; |
af5abf1b | 630 | |
2328af0c VG |
631 | __ic_line_inv_vaddr_local(ic_inv->paddr, ic_inv->vaddr, ic_inv->sz); |
632 | } | |
633 | ||
28b4af72 | 634 | static void __ic_line_inv_vaddr(phys_addr_t paddr, unsigned long vaddr, |
2328af0c VG |
635 | unsigned long sz) |
636 | { | |
af5abf1b VG |
637 | struct ic_inv_args ic_inv = { |
638 | .paddr = paddr, | |
639 | .vaddr = vaddr, | |
640 | .sz = sz | |
641 | }; | |
642 | ||
2328af0c VG |
643 | on_each_cpu(__ic_line_inv_vaddr_helper, &ic_inv, 1); |
644 | } | |
af5abf1b VG |
645 | |
646 | #endif /* CONFIG_SMP */ | |
647 | ||
648 | #else /* !CONFIG_ARC_HAS_ICACHE */ | |
95d6976d | 649 | |
336e199e | 650 | #define __ic_entire_inv() |
95d6976d VG |
651 | #define __ic_line_inv_vaddr(pstart, vstart, sz) |
652 | ||
653 | #endif /* CONFIG_ARC_HAS_ICACHE */ | |
654 | ||
28b4af72 | 655 | noinline void slc_op(phys_addr_t paddr, unsigned long sz, const int op) |
795f4558 VG |
656 | { |
657 | #ifdef CONFIG_ISA_ARCV2 | |
b607eddd AB |
658 | /* |
659 | * SLC is shared between all cores and concurrent aux operations from | |
660 | * multiple cores need to be serialized using a spinlock | |
661 | * A concurrent operation can be silently ignored and/or the old/new | |
662 | * operation can remain incomplete forever (lockup in SLC_CTRL_BUSY loop | |
663 | * below) | |
664 | */ | |
665 | static DEFINE_SPINLOCK(lock); | |
795f4558 VG |
666 | unsigned long flags; |
667 | unsigned int ctrl; | |
668 | ||
b607eddd | 669 | spin_lock_irqsave(&lock, flags); |
795f4558 VG |
670 | |
671 | /* | |
672 | * The Region Flush operation is specified by CTRL.RGN_OP[11..9] | |
673 | * - b'000 (default) is Flush, | |
674 | * - b'001 is Invalidate if CTRL.IM == 0 | |
675 | * - b'001 is Flush-n-Invalidate if CTRL.IM == 1 | |
676 | */ | |
677 | ctrl = read_aux_reg(ARC_REG_SLC_CTRL); | |
678 | ||
679 | /* Don't rely on default value of IM bit */ | |
680 | if (!(op & OP_FLUSH)) /* i.e. OP_INV */ | |
681 | ctrl &= ~SLC_CTRL_IM; /* clear IM: Disable flush before Inv */ | |
682 | else | |
683 | ctrl |= SLC_CTRL_IM; | |
684 | ||
685 | if (op & OP_INV) | |
686 | ctrl |= SLC_CTRL_RGN_OP_INV; /* Inv or flush-n-inv */ | |
687 | else | |
688 | ctrl &= ~SLC_CTRL_RGN_OP_INV; | |
689 | ||
690 | write_aux_reg(ARC_REG_SLC_CTRL, ctrl); | |
691 | ||
692 | /* | |
693 | * Lower bits are ignored, no need to clip | |
694 | * END needs to be setup before START (latter triggers the operation) | |
695 | * END can't be same as START, so add (l2_line_sz - 1) to sz | |
696 | */ | |
697 | write_aux_reg(ARC_REG_SLC_RGN_END, (paddr + sz + l2_line_sz - 1)); | |
698 | write_aux_reg(ARC_REG_SLC_RGN_START, paddr); | |
699 | ||
700 | while (read_aux_reg(ARC_REG_SLC_CTRL) & SLC_CTRL_BUSY); | |
701 | ||
b607eddd | 702 | spin_unlock_irqrestore(&lock, flags); |
795f4558 VG |
703 | #endif |
704 | } | |
705 | ||
d4911cdd VG |
706 | noinline static void slc_entire_op(const int op) |
707 | { | |
708 | unsigned int ctrl, r = ARC_REG_SLC_CTRL; | |
709 | ||
710 | ctrl = read_aux_reg(r); | |
711 | ||
712 | if (!(op & OP_FLUSH)) /* i.e. OP_INV */ | |
713 | ctrl &= ~SLC_CTRL_IM; /* clear IM: Disable flush before Inv */ | |
714 | else | |
715 | ctrl |= SLC_CTRL_IM; | |
716 | ||
717 | write_aux_reg(r, ctrl); | |
718 | ||
719 | write_aux_reg(ARC_REG_SLC_INVALIDATE, 1); | |
720 | ||
c70c4733 AB |
721 | /* Make sure "busy" bit reports correct stataus, see STAR 9001165532 */ |
722 | read_aux_reg(r); | |
723 | ||
d4911cdd VG |
724 | /* Important to wait for flush to complete */ |
725 | while (read_aux_reg(r) & SLC_CTRL_BUSY); | |
726 | } | |
727 | ||
728 | static inline void arc_slc_disable(void) | |
729 | { | |
730 | const int r = ARC_REG_SLC_CTRL; | |
731 | ||
732 | slc_entire_op(OP_FLUSH_N_INV); | |
733 | write_aux_reg(r, read_aux_reg(r) | SLC_CTRL_DIS); | |
734 | } | |
735 | ||
736 | static inline void arc_slc_enable(void) | |
737 | { | |
738 | const int r = ARC_REG_SLC_CTRL; | |
739 | ||
740 | write_aux_reg(r, read_aux_reg(r) & ~SLC_CTRL_DIS); | |
741 | } | |
742 | ||
95d6976d VG |
743 | /*********************************************************** |
744 | * Exported APIs | |
745 | */ | |
746 | ||
4102b533 VG |
747 | /* |
748 | * Handle cache congruency of kernel and userspace mappings of page when kernel | |
749 | * writes-to/reads-from | |
750 | * | |
751 | * The idea is to defer flushing of kernel mapping after a WRITE, possible if: | |
752 | * -dcache is NOT aliasing, hence any U/K-mappings of page are congruent | |
753 | * -U-mapping doesn't exist yet for page (finalised in update_mmu_cache) | |
754 | * -In SMP, if hardware caches are coherent | |
755 | * | |
756 | * There's a corollary case, where kernel READs from a userspace mapped page. | |
757 | * If the U-mapping is not congruent to to K-mapping, former needs flushing. | |
758 | */ | |
95d6976d VG |
759 | void flush_dcache_page(struct page *page) |
760 | { | |
4102b533 VG |
761 | struct address_space *mapping; |
762 | ||
763 | if (!cache_is_vipt_aliasing()) { | |
2ed21dae | 764 | clear_bit(PG_dc_clean, &page->flags); |
4102b533 VG |
765 | return; |
766 | } | |
767 | ||
768 | /* don't handle anon pages here */ | |
769 | mapping = page_mapping(page); | |
770 | if (!mapping) | |
771 | return; | |
772 | ||
773 | /* | |
774 | * pagecache page, file not yet mapped to userspace | |
775 | * Make a note that K-mapping is dirty | |
776 | */ | |
777 | if (!mapping_mapped(mapping)) { | |
2ed21dae | 778 | clear_bit(PG_dc_clean, &page->flags); |
e1534ae9 | 779 | } else if (page_mapcount(page)) { |
4102b533 VG |
780 | |
781 | /* kernel reading from page with U-mapping */ | |
28b4af72 | 782 | phys_addr_t paddr = (unsigned long)page_address(page); |
09cbfeaf | 783 | unsigned long vaddr = page->index << PAGE_SHIFT; |
4102b533 VG |
784 | |
785 | if (addr_not_cache_congruent(paddr, vaddr)) | |
786 | __flush_dcache_page(paddr, vaddr); | |
787 | } | |
95d6976d VG |
788 | } |
789 | EXPORT_SYMBOL(flush_dcache_page); | |
790 | ||
f2b0b25a AB |
791 | /* |
792 | * DMA ops for systems with L1 cache only | |
793 | * Make memory coherent with L1 cache by flushing/invalidating L1 lines | |
794 | */ | |
f5db19e9 | 795 | static void __dma_cache_wback_inv_l1(phys_addr_t start, unsigned long sz) |
95d6976d | 796 | { |
6ec18a81 | 797 | __dc_line_op_k(start, sz, OP_FLUSH_N_INV); |
f2b0b25a | 798 | } |
795f4558 | 799 | |
f5db19e9 | 800 | static void __dma_cache_inv_l1(phys_addr_t start, unsigned long sz) |
f2b0b25a AB |
801 | { |
802 | __dc_line_op_k(start, sz, OP_INV); | |
95d6976d | 803 | } |
95d6976d | 804 | |
f5db19e9 | 805 | static void __dma_cache_wback_l1(phys_addr_t start, unsigned long sz) |
f2b0b25a AB |
806 | { |
807 | __dc_line_op_k(start, sz, OP_FLUSH); | |
808 | } | |
809 | ||
810 | /* | |
811 | * DMA ops for systems with both L1 and L2 caches, but without IOC | |
7423cc0c | 812 | * Both L1 and L2 lines need to be explicitly flushed/invalidated |
f2b0b25a | 813 | */ |
f5db19e9 | 814 | static void __dma_cache_wback_inv_slc(phys_addr_t start, unsigned long sz) |
f2b0b25a AB |
815 | { |
816 | __dc_line_op_k(start, sz, OP_FLUSH_N_INV); | |
817 | slc_op(start, sz, OP_FLUSH_N_INV); | |
818 | } | |
819 | ||
f5db19e9 | 820 | static void __dma_cache_inv_slc(phys_addr_t start, unsigned long sz) |
95d6976d | 821 | { |
6ec18a81 | 822 | __dc_line_op_k(start, sz, OP_INV); |
f2b0b25a AB |
823 | slc_op(start, sz, OP_INV); |
824 | } | |
795f4558 | 825 | |
f5db19e9 | 826 | static void __dma_cache_wback_slc(phys_addr_t start, unsigned long sz) |
f2b0b25a AB |
827 | { |
828 | __dc_line_op_k(start, sz, OP_FLUSH); | |
829 | slc_op(start, sz, OP_FLUSH); | |
830 | } | |
831 | ||
832 | /* | |
833 | * DMA ops for systems with IOC | |
834 | * IOC hardware snoops all DMA traffic keeping the caches consistent with | |
835 | * memory - eliding need for any explicit cache maintenance of DMA buffers | |
836 | */ | |
f5db19e9 VG |
837 | static void __dma_cache_wback_inv_ioc(phys_addr_t start, unsigned long sz) {} |
838 | static void __dma_cache_inv_ioc(phys_addr_t start, unsigned long sz) {} | |
839 | static void __dma_cache_wback_ioc(phys_addr_t start, unsigned long sz) {} | |
f2b0b25a AB |
840 | |
841 | /* | |
842 | * Exported DMA API | |
843 | */ | |
f5db19e9 | 844 | void dma_cache_wback_inv(phys_addr_t start, unsigned long sz) |
f2b0b25a AB |
845 | { |
846 | __dma_cache_wback_inv(start, sz); | |
847 | } | |
848 | EXPORT_SYMBOL(dma_cache_wback_inv); | |
849 | ||
f5db19e9 | 850 | void dma_cache_inv(phys_addr_t start, unsigned long sz) |
f2b0b25a AB |
851 | { |
852 | __dma_cache_inv(start, sz); | |
95d6976d VG |
853 | } |
854 | EXPORT_SYMBOL(dma_cache_inv); | |
855 | ||
f5db19e9 | 856 | void dma_cache_wback(phys_addr_t start, unsigned long sz) |
95d6976d | 857 | { |
f2b0b25a | 858 | __dma_cache_wback(start, sz); |
95d6976d VG |
859 | } |
860 | EXPORT_SYMBOL(dma_cache_wback); | |
861 | ||
862 | /* | |
7586bf72 VG |
863 | * This is API for making I/D Caches consistent when modifying |
864 | * kernel code (loadable modules, kprobes, kgdb...) | |
95d6976d VG |
865 | * This is called on insmod, with kernel virtual address for CODE of |
866 | * the module. ARC cache maintenance ops require PHY address thus we | |
867 | * need to convert vmalloc addr to PHY addr | |
868 | */ | |
869 | void flush_icache_range(unsigned long kstart, unsigned long kend) | |
870 | { | |
c59414cc | 871 | unsigned int tot_sz; |
95d6976d | 872 | |
c59414cc | 873 | WARN(kstart < TASK_SIZE, "%s() can't handle user vaddr", __func__); |
95d6976d VG |
874 | |
875 | /* Shortcut for bigger flush ranges. | |
876 | * Here we don't care if this was kernel virtual or phy addr | |
877 | */ | |
878 | tot_sz = kend - kstart; | |
879 | if (tot_sz > PAGE_SIZE) { | |
880 | flush_cache_all(); | |
881 | return; | |
882 | } | |
883 | ||
884 | /* Case: Kernel Phy addr (0x8000_0000 onwards) */ | |
885 | if (likely(kstart > PAGE_OFFSET)) { | |
7586bf72 VG |
886 | /* |
887 | * The 2nd arg despite being paddr will be used to index icache | |
888 | * This is OK since no alternate virtual mappings will exist | |
889 | * given the callers for this case: kprobe/kgdb in built-in | |
890 | * kernel code only. | |
891 | */ | |
94bad1af | 892 | __sync_icache_dcache(kstart, kstart, kend - kstart); |
95d6976d VG |
893 | return; |
894 | } | |
895 | ||
896 | /* | |
897 | * Case: Kernel Vaddr (0x7000_0000 to 0x7fff_ffff) | |
898 | * (1) ARC Cache Maintenance ops only take Phy addr, hence special | |
899 | * handling of kernel vaddr. | |
900 | * | |
901 | * (2) Despite @tot_sz being < PAGE_SIZE (bigger cases handled already), | |
902 | * it still needs to handle a 2 page scenario, where the range | |
903 | * straddles across 2 virtual pages and hence need for loop | |
904 | */ | |
905 | while (tot_sz > 0) { | |
c59414cc VG |
906 | unsigned int off, sz; |
907 | unsigned long phy, pfn; | |
908 | ||
95d6976d VG |
909 | off = kstart % PAGE_SIZE; |
910 | pfn = vmalloc_to_pfn((void *)kstart); | |
911 | phy = (pfn << PAGE_SHIFT) + off; | |
912 | sz = min_t(unsigned int, tot_sz, PAGE_SIZE - off); | |
94bad1af | 913 | __sync_icache_dcache(phy, kstart, sz); |
95d6976d VG |
914 | kstart += sz; |
915 | tot_sz -= sz; | |
916 | } | |
917 | } | |
e3560305 | 918 | EXPORT_SYMBOL(flush_icache_range); |
95d6976d VG |
919 | |
920 | /* | |
94bad1af VG |
921 | * General purpose helper to make I and D cache lines consistent. |
922 | * @paddr is phy addr of region | |
4b06ff35 VG |
923 | * @vaddr is typically user vaddr (breakpoint) or kernel vaddr (vmalloc) |
924 | * However in one instance, when called by kprobe (for a breakpt in | |
94bad1af VG |
925 | * builtin kernel code) @vaddr will be paddr only, meaning CDU operation will |
926 | * use a paddr to index the cache (despite VIPT). This is fine since since a | |
4b06ff35 VG |
927 | * builtin kernel page will not have any virtual mappings. |
928 | * kprobe on loadable module will be kernel vaddr. | |
95d6976d | 929 | */ |
28b4af72 | 930 | void __sync_icache_dcache(phys_addr_t paddr, unsigned long vaddr, int len) |
95d6976d | 931 | { |
f538881c | 932 | __dc_line_op(paddr, vaddr, len, OP_FLUSH_N_INV); |
2328af0c | 933 | __ic_line_inv_vaddr(paddr, vaddr, len); |
95d6976d VG |
934 | } |
935 | ||
24603fdd | 936 | /* wrapper to compile time eliminate alignment checks in flush loop */ |
28b4af72 | 937 | void __inv_icache_page(phys_addr_t paddr, unsigned long vaddr) |
95d6976d | 938 | { |
24603fdd | 939 | __ic_line_inv_vaddr(paddr, vaddr, PAGE_SIZE); |
95d6976d VG |
940 | } |
941 | ||
6ec18a81 VG |
942 | /* |
943 | * wrapper to clearout kernel or userspace mappings of a page | |
944 | * For kernel mappings @vaddr == @paddr | |
945 | */ | |
28b4af72 | 946 | void __flush_dcache_page(phys_addr_t paddr, unsigned long vaddr) |
eacd0e95 | 947 | { |
6ec18a81 | 948 | __dc_line_op(paddr, vaddr & PAGE_MASK, PAGE_SIZE, OP_FLUSH_N_INV); |
eacd0e95 VG |
949 | } |
950 | ||
95d6976d VG |
951 | noinline void flush_cache_all(void) |
952 | { | |
953 | unsigned long flags; | |
954 | ||
955 | local_irq_save(flags); | |
956 | ||
336e199e | 957 | __ic_entire_inv(); |
95d6976d VG |
958 | __dc_entire_op(OP_FLUSH_N_INV); |
959 | ||
960 | local_irq_restore(flags); | |
961 | ||
962 | } | |
963 | ||
4102b533 VG |
964 | #ifdef CONFIG_ARC_CACHE_VIPT_ALIASING |
965 | ||
966 | void flush_cache_mm(struct mm_struct *mm) | |
967 | { | |
968 | flush_cache_all(); | |
969 | } | |
970 | ||
971 | void flush_cache_page(struct vm_area_struct *vma, unsigned long u_vaddr, | |
972 | unsigned long pfn) | |
973 | { | |
974 | unsigned int paddr = pfn << PAGE_SHIFT; | |
975 | ||
5971bc71 VG |
976 | u_vaddr &= PAGE_MASK; |
977 | ||
45309493 | 978 | __flush_dcache_page(paddr, u_vaddr); |
5971bc71 VG |
979 | |
980 | if (vma->vm_flags & VM_EXEC) | |
981 | __inv_icache_page(paddr, u_vaddr); | |
4102b533 VG |
982 | } |
983 | ||
984 | void flush_cache_range(struct vm_area_struct *vma, unsigned long start, | |
985 | unsigned long end) | |
986 | { | |
987 | flush_cache_all(); | |
988 | } | |
989 | ||
7bb66f6e VG |
990 | void flush_anon_page(struct vm_area_struct *vma, struct page *page, |
991 | unsigned long u_vaddr) | |
992 | { | |
993 | /* TBD: do we really need to clear the kernel mapping */ | |
994 | __flush_dcache_page(page_address(page), u_vaddr); | |
995 | __flush_dcache_page(page_address(page), page_address(page)); | |
996 | ||
997 | } | |
998 | ||
999 | #endif | |
1000 | ||
4102b533 VG |
1001 | void copy_user_highpage(struct page *to, struct page *from, |
1002 | unsigned long u_vaddr, struct vm_area_struct *vma) | |
1003 | { | |
336e2136 VG |
1004 | void *kfrom = kmap_atomic(from); |
1005 | void *kto = kmap_atomic(to); | |
4102b533 VG |
1006 | int clean_src_k_mappings = 0; |
1007 | ||
1008 | /* | |
1009 | * If SRC page was already mapped in userspace AND it's U-mapping is | |
1010 | * not congruent with K-mapping, sync former to physical page so that | |
1011 | * K-mapping in memcpy below, sees the right data | |
1012 | * | |
1013 | * Note that while @u_vaddr refers to DST page's userspace vaddr, it is | |
1014 | * equally valid for SRC page as well | |
336e2136 VG |
1015 | * |
1016 | * For !VIPT cache, all of this gets compiled out as | |
1017 | * addr_not_cache_congruent() is 0 | |
4102b533 | 1018 | */ |
e1534ae9 | 1019 | if (page_mapcount(from) && addr_not_cache_congruent(kfrom, u_vaddr)) { |
336e2136 | 1020 | __flush_dcache_page((unsigned long)kfrom, u_vaddr); |
4102b533 VG |
1021 | clean_src_k_mappings = 1; |
1022 | } | |
1023 | ||
336e2136 | 1024 | copy_page(kto, kfrom); |
4102b533 VG |
1025 | |
1026 | /* | |
1027 | * Mark DST page K-mapping as dirty for a later finalization by | |
1028 | * update_mmu_cache(). Although the finalization could have been done | |
1029 | * here as well (given that both vaddr/paddr are available). | |
1030 | * But update_mmu_cache() already has code to do that for other | |
1031 | * non copied user pages (e.g. read faults which wire in pagecache page | |
1032 | * directly). | |
1033 | */ | |
2ed21dae | 1034 | clear_bit(PG_dc_clean, &to->flags); |
4102b533 VG |
1035 | |
1036 | /* | |
1037 | * if SRC was already usermapped and non-congruent to kernel mapping | |
1038 | * sync the kernel mapping back to physical page | |
1039 | */ | |
1040 | if (clean_src_k_mappings) { | |
336e2136 | 1041 | __flush_dcache_page((unsigned long)kfrom, (unsigned long)kfrom); |
2ed21dae | 1042 | set_bit(PG_dc_clean, &from->flags); |
4102b533 | 1043 | } else { |
2ed21dae | 1044 | clear_bit(PG_dc_clean, &from->flags); |
4102b533 | 1045 | } |
336e2136 VG |
1046 | |
1047 | kunmap_atomic(kto); | |
1048 | kunmap_atomic(kfrom); | |
4102b533 VG |
1049 | } |
1050 | ||
1051 | void clear_user_page(void *to, unsigned long u_vaddr, struct page *page) | |
1052 | { | |
1053 | clear_page(to); | |
2ed21dae | 1054 | clear_bit(PG_dc_clean, &page->flags); |
4102b533 VG |
1055 | } |
1056 | ||
4102b533 | 1057 | |
95d6976d VG |
1058 | /********************************************************************** |
1059 | * Explicit Cache flush request from user space via syscall | |
1060 | * Needed for JITs which generate code on the fly | |
1061 | */ | |
1062 | SYSCALL_DEFINE3(cacheflush, uint32_t, start, uint32_t, sz, uint32_t, flags) | |
1063 | { | |
1064 | /* TBD: optimize this */ | |
1065 | flush_cache_all(); | |
1066 | return 0; | |
1067 | } | |
8ea2ddff | 1068 | |
8c47f83b VG |
1069 | /* |
1070 | * IO-Coherency (IOC) setup rules: | |
1071 | * | |
1072 | * 1. Needs to be at system level, so only once by Master core | |
1073 | * Non-Masters need not be accessing caches at that time | |
1074 | * - They are either HALT_ON_RESET and kick started much later or | |
1075 | * - if run on reset, need to ensure that arc_platform_smp_wait_to_boot() | |
1076 | * doesn't perturb caches or coherency unit | |
1077 | * | |
1078 | * 2. caches (L1 and SLC) need to be purged (flush+inv) before setting up IOC, | |
1079 | * otherwise any straggler data might behave strangely post IOC enabling | |
1080 | * | |
1081 | * 3. All Caches need to be disabled when setting up IOC to elide any in-flight | |
1082 | * Coherency transactions | |
1083 | */ | |
76894a72 | 1084 | noinline void __init arc_ioc_setup(void) |
d4911cdd | 1085 | { |
e497c8e5 VG |
1086 | unsigned int ap_sz; |
1087 | ||
8c47f83b VG |
1088 | /* Flush + invalidate + disable L1 dcache */ |
1089 | __dc_disable(); | |
1090 | ||
1091 | /* Flush + invalidate SLC */ | |
1092 | if (read_aux_reg(ARC_REG_SLC_BCR)) | |
1093 | slc_entire_op(OP_FLUSH_N_INV); | |
1094 | ||
1095 | /* IOC Aperture start: TDB: handle non default CONFIG_LINUX_LINK_BASE */ | |
d4911cdd | 1096 | write_aux_reg(ARC_REG_IO_COH_AP0_BASE, 0x80000); |
8c47f83b | 1097 | |
e497c8e5 VG |
1098 | /* |
1099 | * IOC Aperture size: | |
1100 | * decoded as 2 ^ (SIZE + 2) KB: so setting 0x11 implies 512M | |
1101 | * TBD: fix for PGU + 1GB of low mem | |
1102 | * TBD: fix for PAE | |
1103 | */ | |
1104 | ap_sz = order_base_2(arc_get_mem_sz()/1024) - 2; | |
1105 | write_aux_reg(ARC_REG_IO_COH_AP0_SIZE, ap_sz); | |
8c47f83b | 1106 | |
d4911cdd VG |
1107 | write_aux_reg(ARC_REG_IO_COH_PARTIAL, 1); |
1108 | write_aux_reg(ARC_REG_IO_COH_ENABLE, 1); | |
8c47f83b VG |
1109 | |
1110 | /* Re-enable L1 dcache */ | |
1111 | __dc_enable(); | |
d4911cdd VG |
1112 | } |
1113 | ||
76894a72 | 1114 | void __init arc_cache_init_master(void) |
8ea2ddff VG |
1115 | { |
1116 | unsigned int __maybe_unused cpu = smp_processor_id(); | |
45c3b08a | 1117 | |
8ea2ddff VG |
1118 | if (IS_ENABLED(CONFIG_ARC_HAS_ICACHE)) { |
1119 | struct cpuinfo_arc_cache *ic = &cpuinfo_arc700[cpu].icache; | |
1120 | ||
f64915be | 1121 | if (!ic->line_len) |
8ea2ddff VG |
1122 | panic("cache support enabled but non-existent cache\n"); |
1123 | ||
1124 | if (ic->line_len != L1_CACHE_BYTES) | |
1125 | panic("ICache line [%d] != kernel Config [%d]", | |
1126 | ic->line_len, L1_CACHE_BYTES); | |
1127 | ||
bcc4d65a | 1128 | /* |
2547476a | 1129 | * In MMU v4 (HS38x) the aliasing icache config uses IVIL/PTAG |
bcc4d65a VG |
1130 | * pair to provide vaddr/paddr respectively, just as in MMU v3 |
1131 | */ | |
1132 | if (is_isa_arcv2() && ic->alias) | |
1133 | _cache_line_loop_ic_fn = __cache_line_loop_v3; | |
1134 | else | |
1135 | _cache_line_loop_ic_fn = __cache_line_loop; | |
8ea2ddff VG |
1136 | } |
1137 | ||
1138 | if (IS_ENABLED(CONFIG_ARC_HAS_DCACHE)) { | |
1139 | struct cpuinfo_arc_cache *dc = &cpuinfo_arc700[cpu].dcache; | |
8ea2ddff | 1140 | |
f64915be | 1141 | if (!dc->line_len) |
8ea2ddff VG |
1142 | panic("cache support enabled but non-existent cache\n"); |
1143 | ||
1144 | if (dc->line_len != L1_CACHE_BYTES) | |
1145 | panic("DCache line [%d] != kernel Config [%d]", | |
1146 | dc->line_len, L1_CACHE_BYTES); | |
1147 | ||
d1f317d8 VG |
1148 | /* check for D-Cache aliasing on ARCompact: ARCv2 has PIPT */ |
1149 | if (is_isa_arcompact()) { | |
1150 | int handled = IS_ENABLED(CONFIG_ARC_CACHE_VIPT_ALIASING); | |
08fe0079 VG |
1151 | int num_colors = dc->sz_k/dc->assoc/TO_KB(PAGE_SIZE); |
1152 | ||
1153 | if (dc->alias) { | |
1154 | if (!handled) | |
1155 | panic("Enable CONFIG_ARC_CACHE_VIPT_ALIASING\n"); | |
1156 | if (CACHE_COLORS_NUM != num_colors) | |
1157 | panic("CACHE_COLORS_NUM not optimized for config\n"); | |
1158 | } else if (!dc->alias && handled) { | |
d1f317d8 | 1159 | panic("Disable CONFIG_ARC_CACHE_VIPT_ALIASING\n"); |
08fe0079 | 1160 | } |
d1f317d8 | 1161 | } |
8ea2ddff | 1162 | } |
f2b0b25a | 1163 | |
d4911cdd VG |
1164 | /* Note that SLC disable not formally supported till HS 3.0 */ |
1165 | if (is_isa_arcv2() && l2_line_sz && !slc_enable) | |
1166 | arc_slc_disable(); | |
79335a2c | 1167 | |
d4911cdd VG |
1168 | if (is_isa_arcv2() && ioc_enable) |
1169 | arc_ioc_setup(); | |
79335a2c | 1170 | |
cf986d47 | 1171 | if (is_isa_arcv2() && ioc_enable) { |
f2b0b25a AB |
1172 | __dma_cache_wback_inv = __dma_cache_wback_inv_ioc; |
1173 | __dma_cache_inv = __dma_cache_inv_ioc; | |
1174 | __dma_cache_wback = __dma_cache_wback_ioc; | |
79335a2c | 1175 | } else if (is_isa_arcv2() && l2_line_sz && slc_enable) { |
f2b0b25a AB |
1176 | __dma_cache_wback_inv = __dma_cache_wback_inv_slc; |
1177 | __dma_cache_inv = __dma_cache_inv_slc; | |
1178 | __dma_cache_wback = __dma_cache_wback_slc; | |
1179 | } else { | |
1180 | __dma_cache_wback_inv = __dma_cache_wback_inv_l1; | |
1181 | __dma_cache_inv = __dma_cache_inv_l1; | |
1182 | __dma_cache_wback = __dma_cache_wback_l1; | |
1183 | } | |
8ea2ddff | 1184 | } |
76894a72 VG |
1185 | |
1186 | void __ref arc_cache_init(void) | |
1187 | { | |
1188 | unsigned int __maybe_unused cpu = smp_processor_id(); | |
1189 | char str[256]; | |
1190 | ||
1191 | printk(arc_cache_mumbojumbo(0, str, sizeof(str))); | |
1192 | ||
1193 | /* | |
1194 | * Only master CPU needs to execute rest of function: | |
1195 | * - Assume SMP so all cores will have same cache config so | |
1196 | * any geomtry checks will be same for all | |
1197 | * - IOC setup / dma callbacks only need to be setup once | |
1198 | */ | |
1199 | if (!cpu) | |
1200 | arc_cache_init_master(); | |
1201 | } |