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fb2a27e7 TS |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 2003, 04, 05 Ralf Baechle (ralf@linux-mips.org) | |
7 | * Copyright (C) 2007 Maciej W. Rozycki | |
8 | * Copyright (C) 2008 Thiemo Seufer | |
c0226306 | 9 | * Copyright (C) 2012 MIPS Technologies, Inc. |
fb2a27e7 | 10 | */ |
fb2a27e7 TS |
11 | #include <linux/kernel.h> |
12 | #include <linux/sched.h> | |
631330f5 | 13 | #include <linux/smp.h> |
fb2a27e7 TS |
14 | #include <linux/mm.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/proc_fs.h> | |
17 | ||
18 | #include <asm/bugs.h> | |
19 | #include <asm/cacheops.h> | |
69f24d17 | 20 | #include <asm/cpu-type.h> |
fb2a27e7 TS |
21 | #include <asm/inst.h> |
22 | #include <asm/io.h> | |
23 | #include <asm/page.h> | |
24 | #include <asm/pgtable.h> | |
25 | #include <asm/prefetch.h> | |
fb2a27e7 TS |
26 | #include <asm/bootinfo.h> |
27 | #include <asm/mipsregs.h> | |
28 | #include <asm/mmu_context.h> | |
29 | #include <asm/cpu.h> | |
30 | #include <asm/war.h> | |
31 | ||
32 | #ifdef CONFIG_SIBYTE_DMA_PAGEOPS | |
33 | #include <asm/sibyte/sb1250.h> | |
34 | #include <asm/sibyte/sb1250_regs.h> | |
35 | #include <asm/sibyte/sb1250_dma.h> | |
36 | #endif | |
37 | ||
3482d713 | 38 | #include <asm/uasm.h> |
fb2a27e7 TS |
39 | |
40 | /* Registers used in the assembled routines. */ | |
41 | #define ZERO 0 | |
42 | #define AT 2 | |
43 | #define A0 4 | |
44 | #define A1 5 | |
45 | #define A2 6 | |
46 | #define T0 8 | |
47 | #define T1 9 | |
48 | #define T2 10 | |
49 | #define T3 11 | |
50 | #define T9 25 | |
51 | #define RA 31 | |
52 | ||
53 | /* Handle labels (which must be positive integers). */ | |
54 | enum label_id { | |
55 | label_clear_nopref = 1, | |
56 | label_clear_pref, | |
57 | label_copy_nopref, | |
58 | label_copy_pref_both, | |
59 | label_copy_pref_store, | |
60 | }; | |
61 | ||
62 | UASM_L_LA(_clear_nopref) | |
63 | UASM_L_LA(_clear_pref) | |
64 | UASM_L_LA(_copy_nopref) | |
65 | UASM_L_LA(_copy_pref_both) | |
66 | UASM_L_LA(_copy_pref_store) | |
67 | ||
68 | /* We need one branch and therefore one relocation per target label. */ | |
078a55fc PG |
69 | static struct uasm_label labels[5]; |
70 | static struct uasm_reloc relocs[5]; | |
fb2a27e7 TS |
71 | |
72 | #define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010) | |
73 | #define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020) | |
74 | ||
d2e6d30a MC |
75 | /* |
76 | * R6 has a limited offset of the pref instruction. | |
77 | * Skip it if the offset is more than 9 bits. | |
78 | */ | |
79 | #define _uasm_i_pref(a, b, c, d) \ | |
80 | do { \ | |
81 | if (cpu_has_mips_r6) { \ | |
82 | if (c <= 0xff && c >= -0x100) \ | |
83 | uasm_i_pref(a, b, c, d);\ | |
84 | } else { \ | |
85 | uasm_i_pref(a, b, c, d); \ | |
86 | } \ | |
87 | } while(0) | |
88 | ||
078a55fc PG |
89 | static int pref_bias_clear_store; |
90 | static int pref_bias_copy_load; | |
91 | static int pref_bias_copy_store; | |
fb2a27e7 | 92 | |
078a55fc PG |
93 | static u32 pref_src_mode; |
94 | static u32 pref_dst_mode; | |
fb2a27e7 | 95 | |
078a55fc PG |
96 | static int clear_word_size; |
97 | static int copy_word_size; | |
fb2a27e7 | 98 | |
078a55fc PG |
99 | static int half_clear_loop_size; |
100 | static int half_copy_loop_size; | |
fb2a27e7 | 101 | |
078a55fc | 102 | static int cache_line_size; |
fb2a27e7 TS |
103 | #define cache_line_mask() (cache_line_size - 1) |
104 | ||
078a55fc | 105 | static inline void |
fb2a27e7 TS |
106 | pg_addiu(u32 **buf, unsigned int reg1, unsigned int reg2, unsigned int off) |
107 | { | |
108 | if (cpu_has_64bit_gp_regs && DADDI_WAR && r4k_daddiu_bug()) { | |
109 | if (off > 0x7fff) { | |
110 | uasm_i_lui(buf, T9, uasm_rel_hi(off)); | |
111 | uasm_i_addiu(buf, T9, T9, uasm_rel_lo(off)); | |
112 | } else | |
113 | uasm_i_addiu(buf, T9, ZERO, off); | |
114 | uasm_i_daddu(buf, reg1, reg2, T9); | |
115 | } else { | |
116 | if (off > 0x7fff) { | |
117 | uasm_i_lui(buf, T9, uasm_rel_hi(off)); | |
118 | uasm_i_addiu(buf, T9, T9, uasm_rel_lo(off)); | |
119 | UASM_i_ADDU(buf, reg1, reg2, T9); | |
120 | } else | |
121 | UASM_i_ADDIU(buf, reg1, reg2, off); | |
122 | } | |
123 | } | |
124 | ||
078a55fc | 125 | static void set_prefetch_parameters(void) |
fb2a27e7 TS |
126 | { |
127 | if (cpu_has_64bit_gp_regs || cpu_has_64bit_zero_reg) | |
128 | clear_word_size = 8; | |
129 | else | |
130 | clear_word_size = 4; | |
131 | ||
132 | if (cpu_has_64bit_gp_regs) | |
133 | copy_word_size = 8; | |
134 | else | |
135 | copy_word_size = 4; | |
136 | ||
137 | /* | |
138 | * The pref's used here are using "streaming" hints, which cause the | |
139 | * copied data to be kicked out of the cache sooner. A page copy often | |
140 | * ends up copying a lot more data than is commonly used, so this seems | |
141 | * to make sense in terms of reducing cache pollution, but I've no real | |
142 | * performance data to back this up. | |
143 | */ | |
144 | if (cpu_has_prefetch) { | |
145 | /* | |
146 | * XXX: Most prefetch bias values in here are based on | |
147 | * guesswork. | |
148 | */ | |
149 | cache_line_size = cpu_dcache_line_size(); | |
150 | switch (current_cpu_type()) { | |
a644b277 | 151 | case CPU_R5500: |
fb2a27e7 | 152 | case CPU_TX49XX: |
a644b277 | 153 | /* These processors only support the Pref_Load. */ |
fb2a27e7 TS |
154 | pref_bias_copy_load = 256; |
155 | break; | |
156 | ||
fb2a27e7 TS |
157 | case CPU_R10000: |
158 | case CPU_R12000: | |
159 | case CPU_R14000: | |
30577391 | 160 | case CPU_R16000: |
fb2a27e7 TS |
161 | /* |
162 | * Those values have been experimentally tuned for an | |
163 | * Origin 200. | |
164 | */ | |
165 | pref_bias_clear_store = 512; | |
166 | pref_bias_copy_load = 256; | |
167 | pref_bias_copy_store = 256; | |
168 | pref_src_mode = Pref_LoadStreamed; | |
169 | pref_dst_mode = Pref_StoreStreamed; | |
170 | break; | |
171 | ||
172 | case CPU_SB1: | |
173 | case CPU_SB1A: | |
174 | pref_bias_clear_store = 128; | |
175 | pref_bias_copy_load = 128; | |
176 | pref_bias_copy_store = 128; | |
177 | /* | |
178 | * SB1 pass1 Pref_LoadStreamed/Pref_StoreStreamed | |
179 | * hints are broken. | |
180 | */ | |
181 | if (current_cpu_type() == CPU_SB1 && | |
182 | (current_cpu_data.processor_id & 0xff) < 0x02) { | |
183 | pref_src_mode = Pref_Load; | |
184 | pref_dst_mode = Pref_Store; | |
185 | } else { | |
186 | pref_src_mode = Pref_LoadStreamed; | |
187 | pref_dst_mode = Pref_StoreStreamed; | |
188 | } | |
189 | break; | |
190 | ||
191 | default: | |
192 | pref_bias_clear_store = 128; | |
193 | pref_bias_copy_load = 256; | |
194 | pref_bias_copy_store = 128; | |
195 | pref_src_mode = Pref_LoadStreamed; | |
d2e6d30a MC |
196 | if (cpu_has_mips_r6) |
197 | /* | |
198 | * Bit 30 (Pref_PrepareForStore) has been | |
199 | * removed from MIPS R6. Use bit 5 | |
200 | * (Pref_StoreStreamed). | |
201 | */ | |
202 | pref_dst_mode = Pref_StoreStreamed; | |
203 | else | |
204 | pref_dst_mode = Pref_PrepareForStore; | |
fb2a27e7 TS |
205 | break; |
206 | } | |
207 | } else { | |
208 | if (cpu_has_cache_cdex_s) | |
209 | cache_line_size = cpu_scache_line_size(); | |
210 | else if (cpu_has_cache_cdex_p) | |
211 | cache_line_size = cpu_dcache_line_size(); | |
212 | } | |
213 | /* | |
214 | * Too much unrolling will overflow the available space in | |
14defd90 | 215 | * clear_space_array / copy_page_array. |
fb2a27e7 | 216 | */ |
14defd90 | 217 | half_clear_loop_size = min(16 * clear_word_size, |
fb2a27e7 TS |
218 | max(cache_line_size >> 1, |
219 | 4 * clear_word_size)); | |
14defd90 | 220 | half_copy_loop_size = min(16 * copy_word_size, |
fb2a27e7 TS |
221 | max(cache_line_size >> 1, |
222 | 4 * copy_word_size)); | |
223 | } | |
224 | ||
078a55fc | 225 | static void build_clear_store(u32 **buf, int off) |
fb2a27e7 TS |
226 | { |
227 | if (cpu_has_64bit_gp_regs || cpu_has_64bit_zero_reg) { | |
228 | uasm_i_sd(buf, ZERO, off, A0); | |
229 | } else { | |
230 | uasm_i_sw(buf, ZERO, off, A0); | |
231 | } | |
232 | } | |
233 | ||
078a55fc | 234 | static inline void build_clear_pref(u32 **buf, int off) |
fb2a27e7 TS |
235 | { |
236 | if (off & cache_line_mask()) | |
237 | return; | |
238 | ||
239 | if (pref_bias_clear_store) { | |
d2e6d30a | 240 | _uasm_i_pref(buf, pref_dst_mode, pref_bias_clear_store + off, |
fb2a27e7 | 241 | A0); |
14defd90 TB |
242 | } else if (cache_line_size == (half_clear_loop_size << 1)) { |
243 | if (cpu_has_cache_cdex_s) { | |
244 | uasm_i_cache(buf, Create_Dirty_Excl_SD, off, A0); | |
245 | } else if (cpu_has_cache_cdex_p) { | |
246 | if (R4600_V1_HIT_CACHEOP_WAR && cpu_is_r4600_v1_x()) { | |
247 | uasm_i_nop(buf); | |
248 | uasm_i_nop(buf); | |
249 | uasm_i_nop(buf); | |
250 | uasm_i_nop(buf); | |
251 | } | |
fb2a27e7 | 252 | |
14defd90 TB |
253 | if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) |
254 | uasm_i_lw(buf, ZERO, ZERO, AT); | |
fb2a27e7 | 255 | |
14defd90 TB |
256 | uasm_i_cache(buf, Create_Dirty_Excl_D, off, A0); |
257 | } | |
fc192e50 | 258 | } |
fb2a27e7 TS |
259 | } |
260 | ||
c0226306 SH |
261 | extern u32 __clear_page_start; |
262 | extern u32 __clear_page_end; | |
263 | extern u32 __copy_page_start; | |
264 | extern u32 __copy_page_end; | |
265 | ||
078a55fc | 266 | void build_clear_page(void) |
fb2a27e7 TS |
267 | { |
268 | int off; | |
c0226306 | 269 | u32 *buf = &__clear_page_start; |
fb2a27e7 TS |
270 | struct uasm_label *l = labels; |
271 | struct uasm_reloc *r = relocs; | |
272 | int i; | |
8759934e HC |
273 | static atomic_t run_once = ATOMIC_INIT(0); |
274 | ||
275 | if (atomic_xchg(&run_once, 1)) { | |
276 | return; | |
277 | } | |
fb2a27e7 TS |
278 | |
279 | memset(labels, 0, sizeof(labels)); | |
280 | memset(relocs, 0, sizeof(relocs)); | |
281 | ||
282 | set_prefetch_parameters(); | |
283 | ||
284 | /* | |
285 | * This algorithm makes the following assumptions: | |
286 | * - The prefetch bias is a multiple of 2 words. | |
287 | * - The prefetch bias is less than one page. | |
288 | */ | |
289 | BUG_ON(pref_bias_clear_store % (2 * clear_word_size)); | |
290 | BUG_ON(PAGE_SIZE < pref_bias_clear_store); | |
291 | ||
292 | off = PAGE_SIZE - pref_bias_clear_store; | |
293 | if (off > 0xffff || !pref_bias_clear_store) | |
294 | pg_addiu(&buf, A2, A0, off); | |
295 | else | |
296 | uasm_i_ori(&buf, A2, A0, off); | |
297 | ||
298 | if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) | |
f3f0d951 | 299 | uasm_i_lui(&buf, AT, uasm_rel_hi(0xa0000000)); |
fb2a27e7 | 300 | |
cd9da13d | 301 | off = cache_line_size ? min(8, pref_bias_clear_store / cache_line_size) |
70342287 | 302 | * cache_line_size : 0; |
fb2a27e7 TS |
303 | while (off) { |
304 | build_clear_pref(&buf, -off); | |
305 | off -= cache_line_size; | |
306 | } | |
307 | uasm_l_clear_pref(&l, buf); | |
308 | do { | |
309 | build_clear_pref(&buf, off); | |
310 | build_clear_store(&buf, off); | |
311 | off += clear_word_size; | |
312 | } while (off < half_clear_loop_size); | |
313 | pg_addiu(&buf, A0, A0, 2 * off); | |
314 | off = -off; | |
315 | do { | |
316 | build_clear_pref(&buf, off); | |
317 | if (off == -clear_word_size) | |
318 | uasm_il_bne(&buf, &r, A0, A2, label_clear_pref); | |
319 | build_clear_store(&buf, off); | |
320 | off += clear_word_size; | |
321 | } while (off < 0); | |
322 | ||
323 | if (pref_bias_clear_store) { | |
324 | pg_addiu(&buf, A2, A0, pref_bias_clear_store); | |
325 | uasm_l_clear_nopref(&l, buf); | |
326 | off = 0; | |
327 | do { | |
328 | build_clear_store(&buf, off); | |
329 | off += clear_word_size; | |
330 | } while (off < half_clear_loop_size); | |
331 | pg_addiu(&buf, A0, A0, 2 * off); | |
332 | off = -off; | |
333 | do { | |
334 | if (off == -clear_word_size) | |
335 | uasm_il_bne(&buf, &r, A0, A2, | |
336 | label_clear_nopref); | |
337 | build_clear_store(&buf, off); | |
338 | off += clear_word_size; | |
339 | } while (off < 0); | |
340 | } | |
341 | ||
342 | uasm_i_jr(&buf, RA); | |
343 | uasm_i_nop(&buf); | |
344 | ||
c0226306 | 345 | BUG_ON(buf > &__clear_page_end); |
fb2a27e7 TS |
346 | |
347 | uasm_resolve_relocs(relocs, labels); | |
348 | ||
349 | pr_debug("Synthesized clear page handler (%u instructions).\n", | |
c0226306 | 350 | (u32)(buf - &__clear_page_start)); |
fb2a27e7 TS |
351 | |
352 | pr_debug("\t.set push\n"); | |
353 | pr_debug("\t.set noreorder\n"); | |
c0226306 SH |
354 | for (i = 0; i < (buf - &__clear_page_start); i++) |
355 | pr_debug("\t.word 0x%08x\n", (&__clear_page_start)[i]); | |
fb2a27e7 TS |
356 | pr_debug("\t.set pop\n"); |
357 | } | |
358 | ||
078a55fc | 359 | static void build_copy_load(u32 **buf, int reg, int off) |
fb2a27e7 TS |
360 | { |
361 | if (cpu_has_64bit_gp_regs) { | |
362 | uasm_i_ld(buf, reg, off, A1); | |
363 | } else { | |
364 | uasm_i_lw(buf, reg, off, A1); | |
365 | } | |
366 | } | |
367 | ||
078a55fc | 368 | static void build_copy_store(u32 **buf, int reg, int off) |
fb2a27e7 TS |
369 | { |
370 | if (cpu_has_64bit_gp_regs) { | |
371 | uasm_i_sd(buf, reg, off, A0); | |
372 | } else { | |
373 | uasm_i_sw(buf, reg, off, A0); | |
374 | } | |
375 | } | |
376 | ||
377 | static inline void build_copy_load_pref(u32 **buf, int off) | |
378 | { | |
379 | if (off & cache_line_mask()) | |
380 | return; | |
381 | ||
382 | if (pref_bias_copy_load) | |
d2e6d30a | 383 | _uasm_i_pref(buf, pref_src_mode, pref_bias_copy_load + off, A1); |
fb2a27e7 TS |
384 | } |
385 | ||
386 | static inline void build_copy_store_pref(u32 **buf, int off) | |
387 | { | |
388 | if (off & cache_line_mask()) | |
389 | return; | |
390 | ||
391 | if (pref_bias_copy_store) { | |
d2e6d30a | 392 | _uasm_i_pref(buf, pref_dst_mode, pref_bias_copy_store + off, |
fb2a27e7 | 393 | A0); |
14defd90 TB |
394 | } else if (cache_line_size == (half_copy_loop_size << 1)) { |
395 | if (cpu_has_cache_cdex_s) { | |
396 | uasm_i_cache(buf, Create_Dirty_Excl_SD, off, A0); | |
397 | } else if (cpu_has_cache_cdex_p) { | |
398 | if (R4600_V1_HIT_CACHEOP_WAR && cpu_is_r4600_v1_x()) { | |
399 | uasm_i_nop(buf); | |
400 | uasm_i_nop(buf); | |
401 | uasm_i_nop(buf); | |
402 | uasm_i_nop(buf); | |
403 | } | |
fb2a27e7 | 404 | |
14defd90 TB |
405 | if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) |
406 | uasm_i_lw(buf, ZERO, ZERO, AT); | |
fb2a27e7 | 407 | |
14defd90 TB |
408 | uasm_i_cache(buf, Create_Dirty_Excl_D, off, A0); |
409 | } | |
fb2a27e7 TS |
410 | } |
411 | } | |
412 | ||
078a55fc | 413 | void build_copy_page(void) |
fb2a27e7 TS |
414 | { |
415 | int off; | |
c0226306 | 416 | u32 *buf = &__copy_page_start; |
fb2a27e7 TS |
417 | struct uasm_label *l = labels; |
418 | struct uasm_reloc *r = relocs; | |
419 | int i; | |
8759934e HC |
420 | static atomic_t run_once = ATOMIC_INIT(0); |
421 | ||
422 | if (atomic_xchg(&run_once, 1)) { | |
423 | return; | |
424 | } | |
fb2a27e7 TS |
425 | |
426 | memset(labels, 0, sizeof(labels)); | |
427 | memset(relocs, 0, sizeof(relocs)); | |
428 | ||
429 | set_prefetch_parameters(); | |
430 | ||
431 | /* | |
432 | * This algorithm makes the following assumptions: | |
433 | * - All prefetch biases are multiples of 8 words. | |
434 | * - The prefetch biases are less than one page. | |
435 | * - The store prefetch bias isn't greater than the load | |
436 | * prefetch bias. | |
437 | */ | |
438 | BUG_ON(pref_bias_copy_load % (8 * copy_word_size)); | |
439 | BUG_ON(pref_bias_copy_store % (8 * copy_word_size)); | |
440 | BUG_ON(PAGE_SIZE < pref_bias_copy_load); | |
441 | BUG_ON(pref_bias_copy_store > pref_bias_copy_load); | |
442 | ||
443 | off = PAGE_SIZE - pref_bias_copy_load; | |
444 | if (off > 0xffff || !pref_bias_copy_load) | |
445 | pg_addiu(&buf, A2, A0, off); | |
446 | else | |
447 | uasm_i_ori(&buf, A2, A0, off); | |
448 | ||
449 | if (R4600_V2_HIT_CACHEOP_WAR && cpu_is_r4600_v2_x()) | |
f3f0d951 | 450 | uasm_i_lui(&buf, AT, uasm_rel_hi(0xa0000000)); |
fb2a27e7 | 451 | |
cd9da13d | 452 | off = cache_line_size ? min(8, pref_bias_copy_load / cache_line_size) * |
70342287 | 453 | cache_line_size : 0; |
fb2a27e7 TS |
454 | while (off) { |
455 | build_copy_load_pref(&buf, -off); | |
456 | off -= cache_line_size; | |
457 | } | |
7bd0fea2 | 458 | off = cache_line_size ? min(8, pref_bias_copy_store / cache_line_size) * |
70342287 | 459 | cache_line_size : 0; |
fb2a27e7 TS |
460 | while (off) { |
461 | build_copy_store_pref(&buf, -off); | |
462 | off -= cache_line_size; | |
463 | } | |
464 | uasm_l_copy_pref_both(&l, buf); | |
465 | do { | |
466 | build_copy_load_pref(&buf, off); | |
467 | build_copy_load(&buf, T0, off); | |
468 | build_copy_load_pref(&buf, off + copy_word_size); | |
469 | build_copy_load(&buf, T1, off + copy_word_size); | |
470 | build_copy_load_pref(&buf, off + 2 * copy_word_size); | |
471 | build_copy_load(&buf, T2, off + 2 * copy_word_size); | |
472 | build_copy_load_pref(&buf, off + 3 * copy_word_size); | |
473 | build_copy_load(&buf, T3, off + 3 * copy_word_size); | |
474 | build_copy_store_pref(&buf, off); | |
475 | build_copy_store(&buf, T0, off); | |
476 | build_copy_store_pref(&buf, off + copy_word_size); | |
477 | build_copy_store(&buf, T1, off + copy_word_size); | |
478 | build_copy_store_pref(&buf, off + 2 * copy_word_size); | |
479 | build_copy_store(&buf, T2, off + 2 * copy_word_size); | |
480 | build_copy_store_pref(&buf, off + 3 * copy_word_size); | |
481 | build_copy_store(&buf, T3, off + 3 * copy_word_size); | |
482 | off += 4 * copy_word_size; | |
483 | } while (off < half_copy_loop_size); | |
484 | pg_addiu(&buf, A1, A1, 2 * off); | |
485 | pg_addiu(&buf, A0, A0, 2 * off); | |
486 | off = -off; | |
487 | do { | |
488 | build_copy_load_pref(&buf, off); | |
489 | build_copy_load(&buf, T0, off); | |
490 | build_copy_load_pref(&buf, off + copy_word_size); | |
491 | build_copy_load(&buf, T1, off + copy_word_size); | |
492 | build_copy_load_pref(&buf, off + 2 * copy_word_size); | |
493 | build_copy_load(&buf, T2, off + 2 * copy_word_size); | |
494 | build_copy_load_pref(&buf, off + 3 * copy_word_size); | |
495 | build_copy_load(&buf, T3, off + 3 * copy_word_size); | |
496 | build_copy_store_pref(&buf, off); | |
497 | build_copy_store(&buf, T0, off); | |
498 | build_copy_store_pref(&buf, off + copy_word_size); | |
499 | build_copy_store(&buf, T1, off + copy_word_size); | |
500 | build_copy_store_pref(&buf, off + 2 * copy_word_size); | |
501 | build_copy_store(&buf, T2, off + 2 * copy_word_size); | |
502 | build_copy_store_pref(&buf, off + 3 * copy_word_size); | |
503 | if (off == -(4 * copy_word_size)) | |
504 | uasm_il_bne(&buf, &r, A2, A0, label_copy_pref_both); | |
505 | build_copy_store(&buf, T3, off + 3 * copy_word_size); | |
506 | off += 4 * copy_word_size; | |
507 | } while (off < 0); | |
508 | ||
509 | if (pref_bias_copy_load - pref_bias_copy_store) { | |
510 | pg_addiu(&buf, A2, A0, | |
511 | pref_bias_copy_load - pref_bias_copy_store); | |
512 | uasm_l_copy_pref_store(&l, buf); | |
513 | off = 0; | |
514 | do { | |
515 | build_copy_load(&buf, T0, off); | |
516 | build_copy_load(&buf, T1, off + copy_word_size); | |
517 | build_copy_load(&buf, T2, off + 2 * copy_word_size); | |
518 | build_copy_load(&buf, T3, off + 3 * copy_word_size); | |
519 | build_copy_store_pref(&buf, off); | |
520 | build_copy_store(&buf, T0, off); | |
521 | build_copy_store_pref(&buf, off + copy_word_size); | |
522 | build_copy_store(&buf, T1, off + copy_word_size); | |
523 | build_copy_store_pref(&buf, off + 2 * copy_word_size); | |
524 | build_copy_store(&buf, T2, off + 2 * copy_word_size); | |
525 | build_copy_store_pref(&buf, off + 3 * copy_word_size); | |
526 | build_copy_store(&buf, T3, off + 3 * copy_word_size); | |
527 | off += 4 * copy_word_size; | |
528 | } while (off < half_copy_loop_size); | |
529 | pg_addiu(&buf, A1, A1, 2 * off); | |
530 | pg_addiu(&buf, A0, A0, 2 * off); | |
531 | off = -off; | |
532 | do { | |
533 | build_copy_load(&buf, T0, off); | |
534 | build_copy_load(&buf, T1, off + copy_word_size); | |
535 | build_copy_load(&buf, T2, off + 2 * copy_word_size); | |
536 | build_copy_load(&buf, T3, off + 3 * copy_word_size); | |
537 | build_copy_store_pref(&buf, off); | |
538 | build_copy_store(&buf, T0, off); | |
539 | build_copy_store_pref(&buf, off + copy_word_size); | |
540 | build_copy_store(&buf, T1, off + copy_word_size); | |
541 | build_copy_store_pref(&buf, off + 2 * copy_word_size); | |
542 | build_copy_store(&buf, T2, off + 2 * copy_word_size); | |
543 | build_copy_store_pref(&buf, off + 3 * copy_word_size); | |
544 | if (off == -(4 * copy_word_size)) | |
545 | uasm_il_bne(&buf, &r, A2, A0, | |
546 | label_copy_pref_store); | |
547 | build_copy_store(&buf, T3, off + 3 * copy_word_size); | |
548 | off += 4 * copy_word_size; | |
549 | } while (off < 0); | |
550 | } | |
551 | ||
552 | if (pref_bias_copy_store) { | |
553 | pg_addiu(&buf, A2, A0, pref_bias_copy_store); | |
554 | uasm_l_copy_nopref(&l, buf); | |
555 | off = 0; | |
556 | do { | |
557 | build_copy_load(&buf, T0, off); | |
558 | build_copy_load(&buf, T1, off + copy_word_size); | |
559 | build_copy_load(&buf, T2, off + 2 * copy_word_size); | |
560 | build_copy_load(&buf, T3, off + 3 * copy_word_size); | |
561 | build_copy_store(&buf, T0, off); | |
562 | build_copy_store(&buf, T1, off + copy_word_size); | |
563 | build_copy_store(&buf, T2, off + 2 * copy_word_size); | |
564 | build_copy_store(&buf, T3, off + 3 * copy_word_size); | |
565 | off += 4 * copy_word_size; | |
566 | } while (off < half_copy_loop_size); | |
567 | pg_addiu(&buf, A1, A1, 2 * off); | |
568 | pg_addiu(&buf, A0, A0, 2 * off); | |
569 | off = -off; | |
570 | do { | |
571 | build_copy_load(&buf, T0, off); | |
572 | build_copy_load(&buf, T1, off + copy_word_size); | |
573 | build_copy_load(&buf, T2, off + 2 * copy_word_size); | |
574 | build_copy_load(&buf, T3, off + 3 * copy_word_size); | |
575 | build_copy_store(&buf, T0, off); | |
576 | build_copy_store(&buf, T1, off + copy_word_size); | |
577 | build_copy_store(&buf, T2, off + 2 * copy_word_size); | |
578 | if (off == -(4 * copy_word_size)) | |
579 | uasm_il_bne(&buf, &r, A2, A0, | |
580 | label_copy_nopref); | |
581 | build_copy_store(&buf, T3, off + 3 * copy_word_size); | |
582 | off += 4 * copy_word_size; | |
583 | } while (off < 0); | |
584 | } | |
585 | ||
586 | uasm_i_jr(&buf, RA); | |
587 | uasm_i_nop(&buf); | |
588 | ||
c0226306 | 589 | BUG_ON(buf > &__copy_page_end); |
fb2a27e7 TS |
590 | |
591 | uasm_resolve_relocs(relocs, labels); | |
592 | ||
593 | pr_debug("Synthesized copy page handler (%u instructions).\n", | |
c0226306 | 594 | (u32)(buf - &__copy_page_start)); |
fb2a27e7 TS |
595 | |
596 | pr_debug("\t.set push\n"); | |
597 | pr_debug("\t.set noreorder\n"); | |
c0226306 SH |
598 | for (i = 0; i < (buf - &__copy_page_start); i++) |
599 | pr_debug("\t.word 0x%08x\n", (&__copy_page_start)[i]); | |
fb2a27e7 TS |
600 | pr_debug("\t.set pop\n"); |
601 | } | |
602 | ||
603 | #ifdef CONFIG_SIBYTE_DMA_PAGEOPS | |
c0226306 SH |
604 | extern void clear_page_cpu(void *page); |
605 | extern void copy_page_cpu(void *to, void *from); | |
fb2a27e7 TS |
606 | |
607 | /* | |
608 | * Pad descriptors to cacheline, since each is exclusively owned by a | |
609 | * particular CPU. | |
610 | */ | |
611 | struct dmadscr { | |
612 | u64 dscr_a; | |
613 | u64 dscr_b; | |
614 | u64 pad_a; | |
615 | u64 pad_b; | |
616 | } ____cacheline_aligned_in_smp page_descr[DM_NUM_CHANNELS]; | |
617 | ||
618 | void sb1_dma_init(void) | |
619 | { | |
620 | int i; | |
621 | ||
622 | for (i = 0; i < DM_NUM_CHANNELS; i++) { | |
623 | const u64 base_val = CPHYSADDR((unsigned long)&page_descr[i]) | | |
624 | V_DM_DSCR_BASE_RINGSZ(1); | |
625 | void *base_reg = IOADDR(A_DM_REGISTER(i, R_DM_DSCR_BASE)); | |
626 | ||
627 | __raw_writeq(base_val, base_reg); | |
628 | __raw_writeq(base_val | M_DM_DSCR_BASE_RESET, base_reg); | |
629 | __raw_writeq(base_val | M_DM_DSCR_BASE_ENABL, base_reg); | |
630 | } | |
631 | } | |
632 | ||
633 | void clear_page(void *page) | |
634 | { | |
635 | u64 to_phys = CPHYSADDR((unsigned long)page); | |
636 | unsigned int cpu = smp_processor_id(); | |
637 | ||
638 | /* if the page is not in KSEG0, use old way */ | |
639 | if ((long)KSEGX((unsigned long)page) != (long)CKSEG0) | |
640 | return clear_page_cpu(page); | |
641 | ||
642 | page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_ZERO_MEM | | |
643 | M_DM_DSCRA_L2C_DEST | M_DM_DSCRA_INTERRUPT; | |
644 | page_descr[cpu].dscr_b = V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE); | |
645 | __raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT))); | |
646 | ||
647 | /* | |
648 | * Don't really want to do it this way, but there's no | |
649 | * reliable way to delay completion detection. | |
650 | */ | |
651 | while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG))) | |
652 | & M_DM_DSCR_BASE_INTERRUPT)) | |
653 | ; | |
654 | __raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE))); | |
655 | } | |
656 | ||
657 | void copy_page(void *to, void *from) | |
658 | { | |
659 | u64 from_phys = CPHYSADDR((unsigned long)from); | |
660 | u64 to_phys = CPHYSADDR((unsigned long)to); | |
661 | unsigned int cpu = smp_processor_id(); | |
662 | ||
663 | /* if any page is not in KSEG0, use old way */ | |
664 | if ((long)KSEGX((unsigned long)to) != (long)CKSEG0 | |
665 | || (long)KSEGX((unsigned long)from) != (long)CKSEG0) | |
666 | return copy_page_cpu(to, from); | |
667 | ||
668 | page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_L2C_DEST | | |
669 | M_DM_DSCRA_INTERRUPT; | |
670 | page_descr[cpu].dscr_b = from_phys | V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE); | |
671 | __raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT))); | |
672 | ||
673 | /* | |
674 | * Don't really want to do it this way, but there's no | |
675 | * reliable way to delay completion detection. | |
676 | */ | |
677 | while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG))) | |
678 | & M_DM_DSCR_BASE_INTERRUPT)) | |
679 | ; | |
680 | __raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE))); | |
681 | } | |
682 | ||
683 | #endif /* CONFIG_SIBYTE_DMA_PAGEOPS */ |