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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) 2005-2007 Cavium Networks
7 */
8#include <linux/init.h>
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <linux/smp.h>
12#include <linux/mm.h>
13#include <linux/bitops.h>
14#include <linux/cpu.h>
15#include <linux/io.h>
16
17#include <asm/bcache.h>
18#include <asm/bootinfo.h>
19#include <asm/cacheops.h>
20#include <asm/cpu-features.h>
21#include <asm/page.h>
22#include <asm/pgtable.h>
23#include <asm/r4kcache.h>
24#include <asm/system.h>
25#include <asm/mmu_context.h>
26#include <asm/war.h>
27
28#include <asm/octeon/octeon.h>
29
30unsigned long long cache_err_dcache[NR_CPUS];
31
32/**
33 * Octeon automatically flushes the dcache on tlb changes, so
34 * from Linux's viewpoint it acts much like a physically
35 * tagged cache. No flushing is needed
36 *
37 */
38static void octeon_flush_data_cache_page(unsigned long addr)
39{
40 /* Nothing to do */
41}
42
43static inline void octeon_local_flush_icache(void)
44{
45 asm volatile ("synci 0($0)");
46}
47
48/*
49 * Flush local I-cache for the specified range.
50 */
51static void local_octeon_flush_icache_range(unsigned long start,
52 unsigned long end)
53{
54 octeon_local_flush_icache();
55}
56
57/**
58 * Flush caches as necessary for all cores affected by a
59 * vma. If no vma is supplied, all cores are flushed.
60 *
61 * @vma: VMA to flush or NULL to flush all icaches.
62 */
63static void octeon_flush_icache_all_cores(struct vm_area_struct *vma)
64{
65 extern void octeon_send_ipi_single(int cpu, unsigned int action);
66#ifdef CONFIG_SMP
67 int cpu;
68 cpumask_t mask;
69#endif
70
71 mb();
72 octeon_local_flush_icache();
73#ifdef CONFIG_SMP
74 preempt_disable();
75 cpu = smp_processor_id();
76
77 /*
78 * If we have a vma structure, we only need to worry about
79 * cores it has been used on
80 */
81 if (vma)
82 mask = *mm_cpumask(vma->vm_mm);
83 else
84 mask = cpu_online_map;
85 cpu_clear(cpu, mask);
86 for_each_cpu_mask(cpu, mask)
87 octeon_send_ipi_single(cpu, SMP_ICACHE_FLUSH);
88
89 preempt_enable();
90#endif
91}
92
93
94/**
95 * Called to flush the icache on all cores
96 */
97static void octeon_flush_icache_all(void)
98{
99 octeon_flush_icache_all_cores(NULL);
100}
101
102
103/**
104 * Called to flush all memory associated with a memory
105 * context.
106 *
107 * @mm: Memory context to flush
108 */
109static void octeon_flush_cache_mm(struct mm_struct *mm)
110{
111 /*
112 * According to the R4K version of this file, CPUs without
113 * dcache aliases don't need to do anything here
114 */
115}
116
117
118/**
119 * Flush a range of kernel addresses out of the icache
120 *
121 */
122static void octeon_flush_icache_range(unsigned long start, unsigned long end)
123{
124 octeon_flush_icache_all_cores(NULL);
125}
126
127
128/**
129 * Flush the icache for a trampoline. These are used for interrupt
130 * and exception hooking.
131 *
132 * @addr: Address to flush
133 */
134static void octeon_flush_cache_sigtramp(unsigned long addr)
135{
136 struct vm_area_struct *vma;
137
138 vma = find_vma(current->mm, addr);
139 octeon_flush_icache_all_cores(vma);
140}
141
142
143/**
144 * Flush a range out of a vma
145 *
146 * @vma: VMA to flush
147 * @start:
148 * @end:
149 */
150static void octeon_flush_cache_range(struct vm_area_struct *vma,
151 unsigned long start, unsigned long end)
152{
153 if (vma->vm_flags & VM_EXEC)
154 octeon_flush_icache_all_cores(vma);
155}
156
157
158/**
159 * Flush a specific page of a vma
160 *
161 * @vma: VMA to flush page for
162 * @page: Page to flush
163 * @pfn:
164 */
165static void octeon_flush_cache_page(struct vm_area_struct *vma,
166 unsigned long page, unsigned long pfn)
167{
168 if (vma->vm_flags & VM_EXEC)
169 octeon_flush_icache_all_cores(vma);
170}
171
172
173/**
174 * Probe Octeon's caches
175 *
176 */
177static void __cpuinit probe_octeon(void)
178{
179 unsigned long icache_size;
180 unsigned long dcache_size;
181 unsigned int config1;
182 struct cpuinfo_mips *c = ¤t_cpu_data;
183
184 config1 = read_c0_config1();
185 switch (c->cputype) {
186 case CPU_CAVIUM_OCTEON:
187 case CPU_CAVIUM_OCTEON_PLUS:
188 c->icache.linesz = 2 << ((config1 >> 19) & 7);
189 c->icache.sets = 64 << ((config1 >> 22) & 7);
190 c->icache.ways = 1 + ((config1 >> 16) & 7);
191 c->icache.flags |= MIPS_CACHE_VTAG;
192 icache_size =
193 c->icache.sets * c->icache.ways * c->icache.linesz;
194 c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
195 c->dcache.linesz = 128;
196 if (c->cputype == CPU_CAVIUM_OCTEON_PLUS)
197 c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
198 else
199 c->dcache.sets = 1; /* CN3XXX has one Dcache set */
200 c->dcache.ways = 64;
201 dcache_size =
202 c->dcache.sets * c->dcache.ways * c->dcache.linesz;
203 c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
204 c->options |= MIPS_CPU_PREFETCH;
205 break;
206
207 case CPU_CAVIUM_OCTEON2:
208 c->icache.linesz = 2 << ((config1 >> 19) & 7);
209 c->icache.sets = 8;
210 c->icache.ways = 37;
211 c->icache.flags |= MIPS_CACHE_VTAG;
212 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
213
214 c->dcache.linesz = 128;
215 c->dcache.ways = 32;
216 c->dcache.sets = 8;
217 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
218 c->options |= MIPS_CPU_PREFETCH;
219 break;
220
221 default:
222 panic("Unsupported Cavium Networks CPU type\n");
223 break;
224 }
225
226 /* compute a couple of other cache variables */
227 c->icache.waysize = icache_size / c->icache.ways;
228 c->dcache.waysize = dcache_size / c->dcache.ways;
229
230 c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
231 c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
232
233 if (smp_processor_id() == 0) {
234 pr_notice("Primary instruction cache %ldkB, %s, %d way, "
235 "%d sets, linesize %d bytes.\n",
236 icache_size >> 10,
237 cpu_has_vtag_icache ?
238 "virtually tagged" : "physically tagged",
239 c->icache.ways, c->icache.sets, c->icache.linesz);
240
241 pr_notice("Primary data cache %ldkB, %d-way, %d sets, "
242 "linesize %d bytes.\n",
243 dcache_size >> 10, c->dcache.ways,
244 c->dcache.sets, c->dcache.linesz);
245 }
246}
247
248
249/**
250 * Setup the Octeon cache flush routines
251 *
252 */
253void __cpuinit octeon_cache_init(void)
254{
255 extern unsigned long ebase;
256 extern char except_vec2_octeon;
257
258 memcpy((void *)(ebase + 0x100), &except_vec2_octeon, 0x80);
259 octeon_flush_cache_sigtramp(ebase + 0x100);
260
261 probe_octeon();
262
263 shm_align_mask = PAGE_SIZE - 1;
264
265 flush_cache_all = octeon_flush_icache_all;
266 __flush_cache_all = octeon_flush_icache_all;
267 flush_cache_mm = octeon_flush_cache_mm;
268 flush_cache_page = octeon_flush_cache_page;
269 flush_cache_range = octeon_flush_cache_range;
270 flush_cache_sigtramp = octeon_flush_cache_sigtramp;
271 flush_icache_all = octeon_flush_icache_all;
272 flush_data_cache_page = octeon_flush_data_cache_page;
273 flush_icache_range = octeon_flush_icache_range;
274 local_flush_icache_range = local_octeon_flush_icache_range;
275
276 build_clear_page();
277 build_copy_page();
278}
279
280/**
281 * Handle a cache error exception
282 */
283
284static void cache_parity_error_octeon(int non_recoverable)
285{
286 unsigned long coreid = cvmx_get_core_num();
287 uint64_t icache_err = read_octeon_c0_icacheerr();
288
289 pr_err("Cache error exception:\n");
290 pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
291 if (icache_err & 1) {
292 pr_err("CacheErr (Icache) == %llx\n",
293 (unsigned long long)icache_err);
294 write_octeon_c0_icacheerr(0);
295 }
296 if (cache_err_dcache[coreid] & 1) {
297 pr_err("CacheErr (Dcache) == %llx\n",
298 (unsigned long long)cache_err_dcache[coreid]);
299 cache_err_dcache[coreid] = 0;
300 }
301
302 if (non_recoverable)
303 panic("Can't handle cache error: nested exception");
304}
305
306/**
307 * Called when the the exception is recoverable
308 */
309
310asmlinkage void cache_parity_error_octeon_recoverable(void)
311{
312 cache_parity_error_octeon(0);
313}
314
315/**
316 * Called when the the exception is not recoverable
317 */
318
319asmlinkage void cache_parity_error_octeon_non_recoverable(void)
320{
321 cache_parity_error_octeon(1);
322}
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) 2005-2007 Cavium Networks
7 */
8#include <linux/export.h>
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <linux/smp.h>
12#include <linux/mm.h>
13#include <linux/bitops.h>
14#include <linux/cpu.h>
15#include <linux/io.h>
16
17#include <asm/bcache.h>
18#include <asm/bootinfo.h>
19#include <asm/cacheops.h>
20#include <asm/cpu-features.h>
21#include <asm/cpu-type.h>
22#include <asm/page.h>
23#include <asm/r4kcache.h>
24#include <asm/traps.h>
25#include <asm/mmu_context.h>
26#include <asm/war.h>
27
28#include <asm/octeon/octeon.h>
29
30unsigned long long cache_err_dcache[NR_CPUS];
31EXPORT_SYMBOL_GPL(cache_err_dcache);
32
33/**
34 * Octeon automatically flushes the dcache on tlb changes, so
35 * from Linux's viewpoint it acts much like a physically
36 * tagged cache. No flushing is needed
37 *
38 */
39static void octeon_flush_data_cache_page(unsigned long addr)
40{
41 /* Nothing to do */
42}
43
44static inline void octeon_local_flush_icache(void)
45{
46 asm volatile ("synci 0($0)");
47}
48
49/*
50 * Flush local I-cache for the specified range.
51 */
52static void local_octeon_flush_icache_range(unsigned long start,
53 unsigned long end)
54{
55 octeon_local_flush_icache();
56}
57
58/**
59 * Flush caches as necessary for all cores affected by a
60 * vma. If no vma is supplied, all cores are flushed.
61 *
62 * @vma: VMA to flush or NULL to flush all icaches.
63 */
64static void octeon_flush_icache_all_cores(struct vm_area_struct *vma)
65{
66 extern void octeon_send_ipi_single(int cpu, unsigned int action);
67#ifdef CONFIG_SMP
68 int cpu;
69 cpumask_t mask;
70#endif
71
72 mb();
73 octeon_local_flush_icache();
74#ifdef CONFIG_SMP
75 preempt_disable();
76 cpu = smp_processor_id();
77
78 /*
79 * If we have a vma structure, we only need to worry about
80 * cores it has been used on
81 */
82 if (vma)
83 mask = *mm_cpumask(vma->vm_mm);
84 else
85 mask = *cpu_online_mask;
86 cpumask_clear_cpu(cpu, &mask);
87 for_each_cpu(cpu, &mask)
88 octeon_send_ipi_single(cpu, SMP_ICACHE_FLUSH);
89
90 preempt_enable();
91#endif
92}
93
94
95/**
96 * Called to flush the icache on all cores
97 */
98static void octeon_flush_icache_all(void)
99{
100 octeon_flush_icache_all_cores(NULL);
101}
102
103
104/**
105 * Called to flush all memory associated with a memory
106 * context.
107 *
108 * @mm: Memory context to flush
109 */
110static void octeon_flush_cache_mm(struct mm_struct *mm)
111{
112 /*
113 * According to the R4K version of this file, CPUs without
114 * dcache aliases don't need to do anything here
115 */
116}
117
118
119/**
120 * Flush a range of kernel addresses out of the icache
121 *
122 */
123static void octeon_flush_icache_range(unsigned long start, unsigned long end)
124{
125 octeon_flush_icache_all_cores(NULL);
126}
127
128
129/**
130 * Flush a range out of a vma
131 *
132 * @vma: VMA to flush
133 * @start:
134 * @end:
135 */
136static void octeon_flush_cache_range(struct vm_area_struct *vma,
137 unsigned long start, unsigned long end)
138{
139 if (vma->vm_flags & VM_EXEC)
140 octeon_flush_icache_all_cores(vma);
141}
142
143
144/**
145 * Flush a specific page of a vma
146 *
147 * @vma: VMA to flush page for
148 * @page: Page to flush
149 * @pfn:
150 */
151static void octeon_flush_cache_page(struct vm_area_struct *vma,
152 unsigned long page, unsigned long pfn)
153{
154 if (vma->vm_flags & VM_EXEC)
155 octeon_flush_icache_all_cores(vma);
156}
157
158static void octeon_flush_kernel_vmap_range(unsigned long vaddr, int size)
159{
160 BUG();
161}
162
163/**
164 * Probe Octeon's caches
165 *
166 */
167static void probe_octeon(void)
168{
169 unsigned long icache_size;
170 unsigned long dcache_size;
171 unsigned int config1;
172 struct cpuinfo_mips *c = ¤t_cpu_data;
173 int cputype = current_cpu_type();
174
175 config1 = read_c0_config1();
176 switch (cputype) {
177 case CPU_CAVIUM_OCTEON:
178 case CPU_CAVIUM_OCTEON_PLUS:
179 c->icache.linesz = 2 << ((config1 >> 19) & 7);
180 c->icache.sets = 64 << ((config1 >> 22) & 7);
181 c->icache.ways = 1 + ((config1 >> 16) & 7);
182 c->icache.flags |= MIPS_CACHE_VTAG;
183 icache_size =
184 c->icache.sets * c->icache.ways * c->icache.linesz;
185 c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
186 c->dcache.linesz = 128;
187 if (cputype == CPU_CAVIUM_OCTEON_PLUS)
188 c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
189 else
190 c->dcache.sets = 1; /* CN3XXX has one Dcache set */
191 c->dcache.ways = 64;
192 dcache_size =
193 c->dcache.sets * c->dcache.ways * c->dcache.linesz;
194 c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
195 c->options |= MIPS_CPU_PREFETCH;
196 break;
197
198 case CPU_CAVIUM_OCTEON2:
199 c->icache.linesz = 2 << ((config1 >> 19) & 7);
200 c->icache.sets = 8;
201 c->icache.ways = 37;
202 c->icache.flags |= MIPS_CACHE_VTAG;
203 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
204
205 c->dcache.linesz = 128;
206 c->dcache.ways = 32;
207 c->dcache.sets = 8;
208 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
209 c->options |= MIPS_CPU_PREFETCH;
210 break;
211
212 case CPU_CAVIUM_OCTEON3:
213 c->icache.linesz = 128;
214 c->icache.sets = 16;
215 c->icache.ways = 39;
216 c->icache.flags |= MIPS_CACHE_VTAG;
217 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
218
219 c->dcache.linesz = 128;
220 c->dcache.ways = 32;
221 c->dcache.sets = 8;
222 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
223 c->options |= MIPS_CPU_PREFETCH;
224 break;
225
226 default:
227 panic("Unsupported Cavium Networks CPU type");
228 break;
229 }
230
231 /* compute a couple of other cache variables */
232 c->icache.waysize = icache_size / c->icache.ways;
233 c->dcache.waysize = dcache_size / c->dcache.ways;
234
235 c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
236 c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
237
238 if (smp_processor_id() == 0) {
239 pr_info("Primary instruction cache %ldkB, %s, %d way, "
240 "%d sets, linesize %d bytes.\n",
241 icache_size >> 10,
242 cpu_has_vtag_icache ?
243 "virtually tagged" : "physically tagged",
244 c->icache.ways, c->icache.sets, c->icache.linesz);
245
246 pr_info("Primary data cache %ldkB, %d-way, %d sets, "
247 "linesize %d bytes.\n",
248 dcache_size >> 10, c->dcache.ways,
249 c->dcache.sets, c->dcache.linesz);
250 }
251}
252
253static void octeon_cache_error_setup(void)
254{
255 extern char except_vec2_octeon;
256 set_handler(0x100, &except_vec2_octeon, 0x80);
257}
258
259/**
260 * Setup the Octeon cache flush routines
261 *
262 */
263void octeon_cache_init(void)
264{
265 probe_octeon();
266
267 shm_align_mask = PAGE_SIZE - 1;
268
269 flush_cache_all = octeon_flush_icache_all;
270 __flush_cache_all = octeon_flush_icache_all;
271 flush_cache_mm = octeon_flush_cache_mm;
272 flush_cache_page = octeon_flush_cache_page;
273 flush_cache_range = octeon_flush_cache_range;
274 flush_icache_all = octeon_flush_icache_all;
275 flush_data_cache_page = octeon_flush_data_cache_page;
276 flush_icache_range = octeon_flush_icache_range;
277 local_flush_icache_range = local_octeon_flush_icache_range;
278 __flush_icache_user_range = octeon_flush_icache_range;
279 __local_flush_icache_user_range = local_octeon_flush_icache_range;
280
281 __flush_kernel_vmap_range = octeon_flush_kernel_vmap_range;
282
283 build_clear_page();
284 build_copy_page();
285
286 board_cache_error_setup = octeon_cache_error_setup;
287}
288
289/*
290 * Handle a cache error exception
291 */
292static RAW_NOTIFIER_HEAD(co_cache_error_chain);
293
294int register_co_cache_error_notifier(struct notifier_block *nb)
295{
296 return raw_notifier_chain_register(&co_cache_error_chain, nb);
297}
298EXPORT_SYMBOL_GPL(register_co_cache_error_notifier);
299
300int unregister_co_cache_error_notifier(struct notifier_block *nb)
301{
302 return raw_notifier_chain_unregister(&co_cache_error_chain, nb);
303}
304EXPORT_SYMBOL_GPL(unregister_co_cache_error_notifier);
305
306static void co_cache_error_call_notifiers(unsigned long val)
307{
308 int rv = raw_notifier_call_chain(&co_cache_error_chain, val, NULL);
309 if ((rv & ~NOTIFY_STOP_MASK) != NOTIFY_OK) {
310 u64 dcache_err;
311 unsigned long coreid = cvmx_get_core_num();
312 u64 icache_err = read_octeon_c0_icacheerr();
313
314 if (val) {
315 dcache_err = cache_err_dcache[coreid];
316 cache_err_dcache[coreid] = 0;
317 } else {
318 dcache_err = read_octeon_c0_dcacheerr();
319 }
320
321 pr_err("Core%lu: Cache error exception:\n", coreid);
322 pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
323 if (icache_err & 1) {
324 pr_err("CacheErr (Icache) == %llx\n",
325 (unsigned long long)icache_err);
326 write_octeon_c0_icacheerr(0);
327 }
328 if (dcache_err & 1) {
329 pr_err("CacheErr (Dcache) == %llx\n",
330 (unsigned long long)dcache_err);
331 }
332 }
333}
334
335/*
336 * Called when the the exception is recoverable
337 */
338
339asmlinkage void cache_parity_error_octeon_recoverable(void)
340{
341 co_cache_error_call_notifiers(0);
342}
343
344/**
345 * Called when the the exception is not recoverable
346 */
347
348asmlinkage void cache_parity_error_octeon_non_recoverable(void)
349{
350 co_cache_error_call_notifiers(1);
351 panic("Can't handle cache error: nested exception");
352}