aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/mm/c-octeon.c
blob: 10ab69f7183fc8b69630c3c7add7a06a22b64fe4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2005-2007 Cavium Networks
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/bitops.h>
#include <linux/cpu.h>
#include <linux/io.h>

#include <asm/bcache.h>
#include <asm/bootinfo.h>
#include <asm/cacheops.h>
#include <asm/cpu-features.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/r4kcache.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/war.h>

#include <asm/octeon/octeon.h>

unsigned long long cache_err_dcache[NR_CPUS];

/**
 * Octeon automatically flushes the dcache on tlb changes, so
 * from Linux's viewpoint it acts much like a physically
 * tagged cache. No flushing is needed
 *
 */
static void octeon_flush_data_cache_page(unsigned long addr)
{
    /* Nothing to do */
}

static inline void octeon_local_flush_icache(void)
{
	asm volatile ("synci 0($0)");
}

/*
 * Flush local I-cache for the specified range.
 */
static void local_octeon_flush_icache_range(unsigned long start,
					    unsigned long end)
{
	octeon_local_flush_icache();
}

/**
 * Flush caches as necessary for all cores affected by a
 * vma. If no vma is supplied, all cores are flushed.
 *
 * @vma:    VMA to flush or NULL to flush all icaches.
 */
static void octeon_flush_icache_all_cores(struct vm_area_struct *vma)
{
	extern void octeon_send_ipi_single(int cpu, unsigned int action);
#ifdef CONFIG_SMP
	int cpu;
	cpumask_t mask;
#endif

	mb();
	octeon_local_flush_icache();
#ifdef CONFIG_SMP
	preempt_disable();
	cpu = smp_processor_id();

	/*
	 * If we have a vma structure, we only need to worry about
	 * cores it has been used on
	 */
	if (vma)
		mask = vma->vm_mm->cpu_vm_mask;
	else
		mask = cpu_online_map;
	cpu_clear(cpu, mask);
	for_each_cpu_mask(cpu, mask)
		octeon_send_ipi_single(cpu, SMP_ICACHE_FLUSH);

	preempt_enable();
#endif
}


/**
 * Called to flush the icache on all cores
 */
static void octeon_flush_icache_all(void)
{
	octeon_flush_icache_all_cores(NULL);
}


/**
 * Called to flush all memory associated with a memory
 * context.
 *
 * @mm:     Memory context to flush
 */
static void octeon_flush_cache_mm(struct mm_struct *mm)
{
	/*
	 * According to the R4K version of this file, CPUs without
	 * dcache aliases don't need to do anything here
	 */
}


/**
 * Flush a range of kernel addresses out of the icache
 *
 */
static void octeon_flush_icache_range(unsigned long start, unsigned long end)
{
	octeon_flush_icache_all_cores(NULL);
}


/**
 * Flush the icache for a trampoline. These are used for interrupt
 * and exception hooking.
 *
 * @addr:   Address to flush
 */
static void octeon_flush_cache_sigtramp(unsigned long addr)
{
	struct vm_area_struct *vma;

	vma = find_vma(current->mm, addr);
	octeon_flush_icache_all_cores(vma);
}


/**
 * Flush a range out of a vma
 *
 * @vma:    VMA to flush
 * @start:
 * @end:
 */
static void octeon_flush_cache_range(struct vm_area_struct *vma,
				     unsigned long start, unsigned long end)
{
	if (vma->vm_flags & VM_EXEC)
		octeon_flush_icache_all_cores(vma);
}


/**
 * Flush a specific page of a vma
 *
 * @vma:    VMA to flush page for
 * @page:   Page to flush
 * @pfn:
 */
static void octeon_flush_cache_page(struct vm_area_struct *vma,
				    unsigned long page, unsigned long pfn)
{
	if (vma->vm_flags & VM_EXEC)
		octeon_flush_icache_all_cores(vma);
}


/**
 * Probe Octeon's caches
 *
 */
static void __devinit probe_octeon(void)
{
	unsigned long icache_size;
	unsigned long dcache_size;
	unsigned int config1;
	struct cpuinfo_mips *c = &current_cpu_data;

	switch (c->cputype) {
	case CPU_CAVIUM_OCTEON:
		config1 = read_c0_config1();
		c->icache.linesz = 2 << ((config1 >> 19) & 7);
		c->icache.sets = 64 << ((config1 >> 22) & 7);
		c->icache.ways = 1 + ((config1 >> 16) & 7);
		c->icache.flags |= MIPS_CACHE_VTAG;
		icache_size =
			c->icache.sets * c->icache.ways * c->icache.linesz;
		c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
		c->dcache.linesz = 128;
		if (OCTEON_IS_MODEL(OCTEON_CN3XXX))
			c->dcache.sets = 1; /* CN3XXX has one Dcache set */
		else
			c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
		c->dcache.ways = 64;
		dcache_size =
			c->dcache.sets * c->dcache.ways * c->dcache.linesz;
		c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
		c->options |= MIPS_CPU_PREFETCH;
		break;

	default:
		panic("Unsupported Cavium Networks CPU type\n");
		break;
	}

	/* compute a couple of other cache variables */
	c->icache.waysize = icache_size / c->icache.ways;
	c->dcache.waysize = dcache_size / c->dcache.ways;

	c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
	c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);

	if (smp_processor_id() == 0) {
		pr_notice("Primary instruction cache %ldkB, %s, %d way, "
			  "%d sets, linesize %d bytes.\n",
			  icache_size >> 10,
			  cpu_has_vtag_icache ?
				"virtually tagged" : "physically tagged",
			  c->icache.ways, c->icache.sets, c->icache.linesz);

		pr_notice("Primary data cache %ldkB, %d-way, %d sets, "
			  "linesize %d bytes.\n",
			  dcache_size >> 10, c->dcache.ways,
			  c->dcache.sets, c->dcache.linesz);
	}
}


/**
 * Setup the Octeon cache flush routines
 *
 */
void __devinit octeon_cache_init(void)
{
	extern unsigned long ebase;
	extern char except_vec2_octeon;

	memcpy((void *)(ebase + 0x100), &except_vec2_octeon, 0x80);
	octeon_flush_cache_sigtramp(ebase + 0x100);

	probe_octeon();

	shm_align_mask = PAGE_SIZE - 1;

	flush_cache_all			= octeon_flush_icache_all;
	__flush_cache_all		= octeon_flush_icache_all;
	flush_cache_mm			= octeon_flush_cache_mm;
	flush_cache_page		= octeon_flush_cache_page;
	flush_cache_range		= octeon_flush_cache_range;
	flush_cache_sigtramp		= octeon_flush_cache_sigtramp;
	flush_icache_all		= octeon_flush_icache_all;
	flush_data_cache_page		= octeon_flush_data_cache_page;
	flush_icache_range		= octeon_flush_icache_range;
	local_flush_icache_range	= local_octeon_flush_icache_range;

	build_clear_page();
	build_copy_page();
}

/**
 * Handle a cache error exception
 */

static void  cache_parity_error_octeon(int non_recoverable)
{
	unsigned long coreid = cvmx_get_core_num();
	uint64_t icache_err = read_octeon_c0_icacheerr();

	pr_err("Cache error exception:\n");
	pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
	if (icache_err & 1) {
		pr_err("CacheErr (Icache) == %llx\n",
		       (unsigned long long)icache_err);
		write_octeon_c0_icacheerr(0);
	}
	if (cache_err_dcache[coreid] & 1) {
		pr_err("CacheErr (Dcache) == %llx\n",
		       (unsigned long long)cache_err_dcache[coreid]);
		cache_err_dcache[coreid] = 0;
	}

	if (non_recoverable)
		panic("Can't handle cache error: nested exception");
}

/**
 * Called when the the exception is recoverable
 */

asmlinkage void cache_parity_error_octeon_recoverable(void)
{
	cache_parity_error_octeon(0);
}

/**
 * Called when the the exception is not recoverable
 */

asmlinkage void cache_parity_error_octeon_non_recoverable(void)
{
	cache_parity_error_octeon(1);
}