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
30 unsigned long long cache_err_dcache[NR_CPUS];
31 EXPORT_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 */
octeon_flush_data_cache_page(unsigned long addr)39 static void octeon_flush_data_cache_page(unsigned long addr)
40 {
41 /* Nothing to do */
42 }
43
octeon_local_flush_icache(void)44 static 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 */
local_octeon_flush_icache_range(unsigned long start,unsigned long end)52 static void local_octeon_flush_icache_range(unsigned long start,
53 unsigned long end)
54 {
55 octeon_local_flush_icache();
56 }
57
58 /**
59 * octeon_flush_icache_all_cores - Flush caches as necessary for all cores
60 * affected by a vma. If no vma is supplied, all cores are flushed.
61 *
62 * @vma: VMA to flush or NULL to flush all icaches.
63 */
octeon_flush_icache_all_cores(struct vm_area_struct * vma)64 static 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 */
octeon_flush_icache_all(void)98 static void octeon_flush_icache_all(void)
99 {
100 octeon_flush_icache_all_cores(NULL);
101 }
102
103
104 /**
105 * octeon_flush_cache_mm - flush all memory associated with a memory context.
106 *
107 * @mm: Memory context to flush
108 */
octeon_flush_cache_mm(struct mm_struct * mm)109 static 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 */
octeon_flush_icache_range(unsigned long start,unsigned long end)122 static void octeon_flush_icache_range(unsigned long start, unsigned long end)
123 {
124 octeon_flush_icache_all_cores(NULL);
125 }
126
127
128 /**
129 * octeon_flush_cache_range - Flush a range out of a vma
130 *
131 * @vma: VMA to flush
132 * @start: beginning address for flush
133 * @end: ending address for flush
134 */
octeon_flush_cache_range(struct vm_area_struct * vma,unsigned long start,unsigned long end)135 static void octeon_flush_cache_range(struct vm_area_struct *vma,
136 unsigned long start, unsigned long end)
137 {
138 if (vma->vm_flags & VM_EXEC)
139 octeon_flush_icache_all_cores(vma);
140 }
141
142
143 /**
144 * octeon_flush_cache_page - Flush a specific page of a vma
145 *
146 * @vma: VMA to flush page for
147 * @page: Page to flush
148 * @pfn: Page frame number
149 */
octeon_flush_cache_page(struct vm_area_struct * vma,unsigned long page,unsigned long pfn)150 static void octeon_flush_cache_page(struct vm_area_struct *vma,
151 unsigned long page, unsigned long pfn)
152 {
153 if (vma->vm_flags & VM_EXEC)
154 octeon_flush_icache_all_cores(vma);
155 }
156
octeon_flush_kernel_vmap_range(unsigned long vaddr,int size)157 static void octeon_flush_kernel_vmap_range(unsigned long vaddr, int size)
158 {
159 BUG();
160 }
161
162 /*
163 * Probe Octeon's caches
164 *
165 */
probe_octeon(void)166 static void probe_octeon(void)
167 {
168 unsigned long icache_size;
169 unsigned long dcache_size;
170 unsigned int config1;
171 struct cpuinfo_mips *c = ¤t_cpu_data;
172 int cputype = current_cpu_type();
173
174 config1 = read_c0_config1();
175 switch (cputype) {
176 case CPU_CAVIUM_OCTEON:
177 case CPU_CAVIUM_OCTEON_PLUS:
178 c->icache.linesz = 2 << ((config1 >> 19) & 7);
179 c->icache.sets = 64 << ((config1 >> 22) & 7);
180 c->icache.ways = 1 + ((config1 >> 16) & 7);
181 c->icache.flags |= MIPS_CACHE_VTAG;
182 icache_size =
183 c->icache.sets * c->icache.ways * c->icache.linesz;
184 c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
185 c->dcache.linesz = 128;
186 if (cputype == CPU_CAVIUM_OCTEON_PLUS)
187 c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
188 else
189 c->dcache.sets = 1; /* CN3XXX has one Dcache set */
190 c->dcache.ways = 64;
191 dcache_size =
192 c->dcache.sets * c->dcache.ways * c->dcache.linesz;
193 c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
194 c->options |= MIPS_CPU_PREFETCH;
195 break;
196
197 case CPU_CAVIUM_OCTEON2:
198 c->icache.linesz = 2 << ((config1 >> 19) & 7);
199 c->icache.sets = 8;
200 c->icache.ways = 37;
201 c->icache.flags |= MIPS_CACHE_VTAG;
202 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
203
204 c->dcache.linesz = 128;
205 c->dcache.ways = 32;
206 c->dcache.sets = 8;
207 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
208 c->options |= MIPS_CPU_PREFETCH;
209 break;
210
211 case CPU_CAVIUM_OCTEON3:
212 c->icache.linesz = 128;
213 c->icache.sets = 16;
214 c->icache.ways = 39;
215 c->icache.flags |= MIPS_CACHE_VTAG;
216 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
217
218 c->dcache.linesz = 128;
219 c->dcache.ways = 32;
220 c->dcache.sets = 8;
221 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
222 c->options |= MIPS_CPU_PREFETCH;
223 break;
224
225 default:
226 panic("Unsupported Cavium Networks CPU type");
227 break;
228 }
229
230 /* compute a couple of other cache variables */
231 c->icache.waysize = icache_size / c->icache.ways;
232 c->dcache.waysize = dcache_size / c->dcache.ways;
233
234 c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
235 c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
236
237 if (smp_processor_id() == 0) {
238 pr_info("Primary instruction cache %ldkB, %s, %d way, "
239 "%d sets, linesize %d bytes.\n",
240 icache_size >> 10,
241 cpu_has_vtag_icache ?
242 "virtually tagged" : "physically tagged",
243 c->icache.ways, c->icache.sets, c->icache.linesz);
244
245 pr_info("Primary data cache %ldkB, %d-way, %d sets, "
246 "linesize %d bytes.\n",
247 dcache_size >> 10, c->dcache.ways,
248 c->dcache.sets, c->dcache.linesz);
249 }
250 }
251
octeon_cache_error_setup(void)252 static void octeon_cache_error_setup(void)
253 {
254 extern char except_vec2_octeon;
255 set_handler(0x100, &except_vec2_octeon, 0x80);
256 }
257
258 /*
259 * Setup the Octeon cache flush routines
260 *
261 */
octeon_cache_init(void)262 void octeon_cache_init(void)
263 {
264 probe_octeon();
265
266 shm_align_mask = PAGE_SIZE - 1;
267
268 flush_cache_all = octeon_flush_icache_all;
269 __flush_cache_all = octeon_flush_icache_all;
270 flush_cache_mm = octeon_flush_cache_mm;
271 flush_cache_page = octeon_flush_cache_page;
272 flush_cache_range = octeon_flush_cache_range;
273 flush_icache_all = octeon_flush_icache_all;
274 flush_data_cache_page = octeon_flush_data_cache_page;
275 flush_icache_range = octeon_flush_icache_range;
276 local_flush_icache_range = local_octeon_flush_icache_range;
277 __flush_icache_user_range = octeon_flush_icache_range;
278 __local_flush_icache_user_range = local_octeon_flush_icache_range;
279
280 __flush_kernel_vmap_range = octeon_flush_kernel_vmap_range;
281
282 build_clear_page();
283 build_copy_page();
284
285 board_cache_error_setup = octeon_cache_error_setup;
286 }
287
288 /*
289 * Handle a cache error exception
290 */
291 static RAW_NOTIFIER_HEAD(co_cache_error_chain);
292
register_co_cache_error_notifier(struct notifier_block * nb)293 int register_co_cache_error_notifier(struct notifier_block *nb)
294 {
295 return raw_notifier_chain_register(&co_cache_error_chain, nb);
296 }
297 EXPORT_SYMBOL_GPL(register_co_cache_error_notifier);
298
unregister_co_cache_error_notifier(struct notifier_block * nb)299 int unregister_co_cache_error_notifier(struct notifier_block *nb)
300 {
301 return raw_notifier_chain_unregister(&co_cache_error_chain, nb);
302 }
303 EXPORT_SYMBOL_GPL(unregister_co_cache_error_notifier);
304
co_cache_error_call_notifiers(unsigned long val)305 static void co_cache_error_call_notifiers(unsigned long val)
306 {
307 int rv = raw_notifier_call_chain(&co_cache_error_chain, val, NULL);
308 if ((rv & ~NOTIFY_STOP_MASK) != NOTIFY_OK) {
309 u64 dcache_err;
310 unsigned long coreid = cvmx_get_core_num();
311 u64 icache_err = read_octeon_c0_icacheerr();
312
313 if (val) {
314 dcache_err = cache_err_dcache[coreid];
315 cache_err_dcache[coreid] = 0;
316 } else {
317 dcache_err = read_octeon_c0_dcacheerr();
318 }
319
320 pr_err("Core%lu: Cache error exception:\n", coreid);
321 pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
322 if (icache_err & 1) {
323 pr_err("CacheErr (Icache) == %llx\n",
324 (unsigned long long)icache_err);
325 write_octeon_c0_icacheerr(0);
326 }
327 if (dcache_err & 1) {
328 pr_err("CacheErr (Dcache) == %llx\n",
329 (unsigned long long)dcache_err);
330 }
331 }
332 }
333
334 /*
335 * Called when the the exception is recoverable
336 */
337
cache_parity_error_octeon_recoverable(void)338 asmlinkage void cache_parity_error_octeon_recoverable(void)
339 {
340 co_cache_error_call_notifiers(0);
341 }
342
343 /*
344 * Called when the the exception is not recoverable
345 */
346
cache_parity_error_octeon_non_recoverable(void)347 asmlinkage void cache_parity_error_octeon_non_recoverable(void)
348 {
349 co_cache_error_call_notifiers(1);
350 panic("Can't handle cache error: nested exception");
351 }
352