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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/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
27#include <asm/octeon/octeon.h>
28
29unsigned long long cache_err_dcache[NR_CPUS];
30EXPORT_SYMBOL_GPL(cache_err_dcache);
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 * octeon_flush_icache_all_cores - Flush caches as necessary for all cores
59 * affected by a 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_mask;
85 cpumask_clear_cpu(cpu, &mask);
86 for_each_cpu(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 * octeon_flush_cache_mm - flush all memory associated with a memory context.
105 *
106 * @mm: Memory context to flush
107 */
108static void octeon_flush_cache_mm(struct mm_struct *mm)
109{
110 /*
111 * According to the R4K version of this file, CPUs without
112 * dcache aliases don't need to do anything here
113 */
114}
115
116
117/*
118 * Flush a range of kernel addresses out of the icache
119 *
120 */
121static void octeon_flush_icache_range(unsigned long start, unsigned long end)
122{
123 octeon_flush_icache_all_cores(NULL);
124}
125
126
127/**
128 * octeon_flush_cache_range - Flush a range out of a vma
129 *
130 * @vma: VMA to flush
131 * @start: beginning address for flush
132 * @end: ending address for flush
133 */
134static void octeon_flush_cache_range(struct vm_area_struct *vma,
135 unsigned long start, unsigned long end)
136{
137 if (vma->vm_flags & VM_EXEC)
138 octeon_flush_icache_all_cores(vma);
139}
140
141
142/**
143 * octeon_flush_cache_page - Flush a specific page of a vma
144 *
145 * @vma: VMA to flush page for
146 * @page: Page to flush
147 * @pfn: Page frame number
148 */
149static void octeon_flush_cache_page(struct vm_area_struct *vma,
150 unsigned long page, unsigned long pfn)
151{
152 if (vma->vm_flags & VM_EXEC)
153 octeon_flush_icache_all_cores(vma);
154}
155
156static void octeon_flush_kernel_vmap_range(unsigned long vaddr, int size)
157{
158 BUG();
159}
160
161/*
162 * Probe Octeon's caches
163 *
164 */
165static void probe_octeon(void)
166{
167 unsigned long icache_size;
168 unsigned long dcache_size;
169 unsigned int config1;
170 struct cpuinfo_mips *c = ¤t_cpu_data;
171 int cputype = current_cpu_type();
172
173 config1 = read_c0_config1();
174 switch (cputype) {
175 case CPU_CAVIUM_OCTEON:
176 case CPU_CAVIUM_OCTEON_PLUS:
177 c->icache.linesz = 2 << ((config1 >> 19) & 7);
178 c->icache.sets = 64 << ((config1 >> 22) & 7);
179 c->icache.ways = 1 + ((config1 >> 16) & 7);
180 c->icache.flags |= MIPS_CACHE_VTAG;
181 icache_size =
182 c->icache.sets * c->icache.ways * c->icache.linesz;
183 c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
184 c->dcache.linesz = 128;
185 if (cputype == CPU_CAVIUM_OCTEON_PLUS)
186 c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
187 else
188 c->dcache.sets = 1; /* CN3XXX has one Dcache set */
189 c->dcache.ways = 64;
190 dcache_size =
191 c->dcache.sets * c->dcache.ways * c->dcache.linesz;
192 c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
193 c->options |= MIPS_CPU_PREFETCH;
194 break;
195
196 case CPU_CAVIUM_OCTEON2:
197 c->icache.linesz = 2 << ((config1 >> 19) & 7);
198 c->icache.sets = 8;
199 c->icache.ways = 37;
200 c->icache.flags |= MIPS_CACHE_VTAG;
201 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
202
203 c->dcache.linesz = 128;
204 c->dcache.ways = 32;
205 c->dcache.sets = 8;
206 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
207 c->options |= MIPS_CPU_PREFETCH;
208 break;
209
210 case CPU_CAVIUM_OCTEON3:
211 c->icache.linesz = 128;
212 c->icache.sets = 16;
213 c->icache.ways = 39;
214 c->icache.flags |= MIPS_CACHE_VTAG;
215 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
216
217 c->dcache.linesz = 128;
218 c->dcache.ways = 32;
219 c->dcache.sets = 8;
220 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
221 c->options |= MIPS_CPU_PREFETCH;
222 break;
223
224 default:
225 panic("Unsupported Cavium Networks CPU type");
226 break;
227 }
228
229 /* compute a couple of other cache variables */
230 c->icache.waysize = icache_size / c->icache.ways;
231 c->dcache.waysize = dcache_size / c->dcache.ways;
232
233 c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
234 c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
235
236 if (smp_processor_id() == 0) {
237 pr_info("Primary instruction cache %ldkB, %s, %d way, "
238 "%d sets, linesize %d bytes.\n",
239 icache_size >> 10,
240 cpu_has_vtag_icache ?
241 "virtually tagged" : "physically tagged",
242 c->icache.ways, c->icache.sets, c->icache.linesz);
243
244 pr_info("Primary data cache %ldkB, %d-way, %d sets, "
245 "linesize %d bytes.\n",
246 dcache_size >> 10, c->dcache.ways,
247 c->dcache.sets, c->dcache.linesz);
248 }
249}
250
251static void octeon_cache_error_setup(void)
252{
253 extern char except_vec2_octeon;
254 set_handler(0x100, &except_vec2_octeon, 0x80);
255}
256
257/*
258 * Setup the Octeon cache flush routines
259 *
260 */
261void octeon_cache_init(void)
262{
263 probe_octeon();
264
265 shm_align_mask = PAGE_SIZE - 1;
266
267 flush_cache_all = octeon_flush_icache_all;
268 __flush_cache_all = octeon_flush_icache_all;
269 flush_cache_mm = octeon_flush_cache_mm;
270 flush_cache_page = octeon_flush_cache_page;
271 flush_cache_range = octeon_flush_cache_range;
272 flush_icache_all = octeon_flush_icache_all;
273 flush_data_cache_page = octeon_flush_data_cache_page;
274 flush_icache_range = octeon_flush_icache_range;
275 local_flush_icache_range = local_octeon_flush_icache_range;
276 __flush_icache_user_range = octeon_flush_icache_range;
277 __local_flush_icache_user_range = local_octeon_flush_icache_range;
278
279 __flush_kernel_vmap_range = octeon_flush_kernel_vmap_range;
280
281 build_clear_page();
282 build_copy_page();
283
284 board_cache_error_setup = octeon_cache_error_setup;
285}
286
287/*
288 * Handle a cache error exception
289 */
290static RAW_NOTIFIER_HEAD(co_cache_error_chain);
291
292int register_co_cache_error_notifier(struct notifier_block *nb)
293{
294 return raw_notifier_chain_register(&co_cache_error_chain, nb);
295}
296EXPORT_SYMBOL_GPL(register_co_cache_error_notifier);
297
298int unregister_co_cache_error_notifier(struct notifier_block *nb)
299{
300 return raw_notifier_chain_unregister(&co_cache_error_chain, nb);
301}
302EXPORT_SYMBOL_GPL(unregister_co_cache_error_notifier);
303
304static void co_cache_error_call_notifiers(unsigned long val)
305{
306 int rv = raw_notifier_call_chain(&co_cache_error_chain, val, NULL);
307 if ((rv & ~NOTIFY_STOP_MASK) != NOTIFY_OK) {
308 u64 dcache_err;
309 unsigned long coreid = cvmx_get_core_num();
310 u64 icache_err = read_octeon_c0_icacheerr();
311
312 if (val) {
313 dcache_err = cache_err_dcache[coreid];
314 cache_err_dcache[coreid] = 0;
315 } else {
316 dcache_err = read_octeon_c0_dcacheerr();
317 }
318
319 pr_err("Core%lu: Cache error exception:\n", coreid);
320 pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
321 if (icache_err & 1) {
322 pr_err("CacheErr (Icache) == %llx\n",
323 (unsigned long long)icache_err);
324 write_octeon_c0_icacheerr(0);
325 }
326 if (dcache_err & 1) {
327 pr_err("CacheErr (Dcache) == %llx\n",
328 (unsigned long long)dcache_err);
329 }
330 }
331}
332
333/*
334 * Called when the exception is recoverable
335 */
336
337asmlinkage void cache_parity_error_octeon_recoverable(void)
338{
339 co_cache_error_call_notifiers(0);
340}
341
342/*
343 * Called when the exception is not recoverable
344 */
345
346asmlinkage void cache_parity_error_octeon_non_recoverable(void)
347{
348 co_cache_error_call_notifiers(1);
349 panic("Can't handle cache error: nested exception");
350}
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}