forked from Minki/linux
0b991f5cdc
Stephen Powell reported the following crash on a z890 machine: Kernel BUG at 00000000001219d0 [verbose debug info unavailable] illegal operation: 0001 ilc:3 [#1] SMP Krnl PSW : 0704e00180000000 00000000001219d0 (init_cache_level+0x38/0xe0) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 EA:3 Krnl Code: 00000000001219c2: a7840056 brc 8,121a6e 00000000001219c6: a7190000 lghi %r1,0 #00000000001219ca: eb101000004c ecag %r1,%r0,0(%r1) >00000000001219d0: a7390000 lghi %r3,0 00000000001219d4: e310f0a00024 stg %r1,160(%r15) 00000000001219da: a7080000 lhi %r0,0 00000000001219de: a7b9f000 lghi %r11,-4096 00000000001219e2: c0a0002899d9 larl %r10,634d94 Call Trace: [<0000000000478ee2>] detect_cache_attributes+0x2a/0x2b8 [<000000000097c9b0>] cacheinfo_sysfs_init+0x60/0xc8 [<00000000001001c0>] do_one_initcall+0x98/0x1c8 [<000000000094fdc2>] kernel_init_freeable+0x212/0x2d8 [<000000000062352e>] kernel_init+0x26/0x118 [<000000000062fd2e>] kernel_thread_starter+0x6/0xc The illegal operation was executed because of a missing facility check, which should have made sure that the ECAG execution would only be executed on machines which have the general-instructions-extension facility installed. Reported-and-tested-by: Stephen Powell <zlinuxman@wowway.com> Cc: stable@vger.kernel.org # v4.0+ Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
184 lines
4.5 KiB
C
184 lines
4.5 KiB
C
/*
|
|
* Extract CPU cache information and expose them via sysfs.
|
|
*
|
|
* Copyright IBM Corp. 2012
|
|
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/seq_file.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/cacheinfo.h>
|
|
#include <asm/facility.h>
|
|
|
|
enum {
|
|
CACHE_SCOPE_NOTEXISTS,
|
|
CACHE_SCOPE_PRIVATE,
|
|
CACHE_SCOPE_SHARED,
|
|
CACHE_SCOPE_RESERVED,
|
|
};
|
|
|
|
enum {
|
|
CTYPE_SEPARATE,
|
|
CTYPE_DATA,
|
|
CTYPE_INSTRUCTION,
|
|
CTYPE_UNIFIED,
|
|
};
|
|
|
|
enum {
|
|
EXTRACT_TOPOLOGY,
|
|
EXTRACT_LINE_SIZE,
|
|
EXTRACT_SIZE,
|
|
EXTRACT_ASSOCIATIVITY,
|
|
};
|
|
|
|
enum {
|
|
CACHE_TI_UNIFIED = 0,
|
|
CACHE_TI_DATA = 0,
|
|
CACHE_TI_INSTRUCTION,
|
|
};
|
|
|
|
struct cache_info {
|
|
unsigned char : 4;
|
|
unsigned char scope : 2;
|
|
unsigned char type : 2;
|
|
};
|
|
|
|
#define CACHE_MAX_LEVEL 8
|
|
union cache_topology {
|
|
struct cache_info ci[CACHE_MAX_LEVEL];
|
|
unsigned long long raw;
|
|
};
|
|
|
|
static const char * const cache_type_string[] = {
|
|
"",
|
|
"Instruction",
|
|
"Data",
|
|
"",
|
|
"Unified",
|
|
};
|
|
|
|
static const enum cache_type cache_type_map[] = {
|
|
[CTYPE_SEPARATE] = CACHE_TYPE_SEPARATE,
|
|
[CTYPE_DATA] = CACHE_TYPE_DATA,
|
|
[CTYPE_INSTRUCTION] = CACHE_TYPE_INST,
|
|
[CTYPE_UNIFIED] = CACHE_TYPE_UNIFIED,
|
|
};
|
|
|
|
void show_cacheinfo(struct seq_file *m)
|
|
{
|
|
struct cpu_cacheinfo *this_cpu_ci;
|
|
struct cacheinfo *cache;
|
|
int idx;
|
|
|
|
if (!test_facility(34))
|
|
return;
|
|
get_online_cpus();
|
|
this_cpu_ci = get_cpu_cacheinfo(cpumask_any(cpu_online_mask));
|
|
for (idx = 0; idx < this_cpu_ci->num_leaves; idx++) {
|
|
cache = this_cpu_ci->info_list + idx;
|
|
seq_printf(m, "cache%-11d: ", idx);
|
|
seq_printf(m, "level=%d ", cache->level);
|
|
seq_printf(m, "type=%s ", cache_type_string[cache->type]);
|
|
seq_printf(m, "scope=%s ",
|
|
cache->disable_sysfs ? "Shared" : "Private");
|
|
seq_printf(m, "size=%dK ", cache->size >> 10);
|
|
seq_printf(m, "line_size=%u ", cache->coherency_line_size);
|
|
seq_printf(m, "associativity=%d", cache->ways_of_associativity);
|
|
seq_puts(m, "\n");
|
|
}
|
|
put_online_cpus();
|
|
}
|
|
|
|
static inline enum cache_type get_cache_type(struct cache_info *ci, int level)
|
|
{
|
|
if (level >= CACHE_MAX_LEVEL)
|
|
return CACHE_TYPE_NOCACHE;
|
|
ci += level;
|
|
if (ci->scope != CACHE_SCOPE_SHARED && ci->scope != CACHE_SCOPE_PRIVATE)
|
|
return CACHE_TYPE_NOCACHE;
|
|
return cache_type_map[ci->type];
|
|
}
|
|
|
|
static inline unsigned long ecag(int ai, int li, int ti)
|
|
{
|
|
unsigned long cmd, val;
|
|
|
|
cmd = ai << 4 | li << 1 | ti;
|
|
asm volatile(".insn rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
|
|
: "=d" (val) : "a" (cmd));
|
|
return val;
|
|
}
|
|
|
|
static void ci_leaf_init(struct cacheinfo *this_leaf, int private,
|
|
enum cache_type type, unsigned int level, int cpu)
|
|
{
|
|
int ti, num_sets;
|
|
|
|
if (type == CACHE_TYPE_INST)
|
|
ti = CACHE_TI_INSTRUCTION;
|
|
else
|
|
ti = CACHE_TI_UNIFIED;
|
|
this_leaf->level = level + 1;
|
|
this_leaf->type = type;
|
|
this_leaf->coherency_line_size = ecag(EXTRACT_LINE_SIZE, level, ti);
|
|
this_leaf->ways_of_associativity = ecag(EXTRACT_ASSOCIATIVITY, level, ti);
|
|
this_leaf->size = ecag(EXTRACT_SIZE, level, ti);
|
|
num_sets = this_leaf->size / this_leaf->coherency_line_size;
|
|
num_sets /= this_leaf->ways_of_associativity;
|
|
this_leaf->number_of_sets = num_sets;
|
|
cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
|
|
if (!private)
|
|
this_leaf->disable_sysfs = true;
|
|
}
|
|
|
|
int init_cache_level(unsigned int cpu)
|
|
{
|
|
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
|
|
unsigned int level = 0, leaves = 0;
|
|
union cache_topology ct;
|
|
enum cache_type ctype;
|
|
|
|
if (!test_facility(34))
|
|
return -EOPNOTSUPP;
|
|
if (!this_cpu_ci)
|
|
return -EINVAL;
|
|
ct.raw = ecag(EXTRACT_TOPOLOGY, 0, 0);
|
|
do {
|
|
ctype = get_cache_type(&ct.ci[0], level);
|
|
if (ctype == CACHE_TYPE_NOCACHE)
|
|
break;
|
|
/* Separate instruction and data caches */
|
|
leaves += (ctype == CACHE_TYPE_SEPARATE) ? 2 : 1;
|
|
} while (++level < CACHE_MAX_LEVEL);
|
|
this_cpu_ci->num_levels = level;
|
|
this_cpu_ci->num_leaves = leaves;
|
|
return 0;
|
|
}
|
|
|
|
int populate_cache_leaves(unsigned int cpu)
|
|
{
|
|
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
|
|
struct cacheinfo *this_leaf = this_cpu_ci->info_list;
|
|
unsigned int level, idx, pvt;
|
|
union cache_topology ct;
|
|
enum cache_type ctype;
|
|
|
|
if (!test_facility(34))
|
|
return -EOPNOTSUPP;
|
|
ct.raw = ecag(EXTRACT_TOPOLOGY, 0, 0);
|
|
for (idx = 0, level = 0; level < this_cpu_ci->num_levels &&
|
|
idx < this_cpu_ci->num_leaves; idx++, level++) {
|
|
if (!this_leaf)
|
|
return -EINVAL;
|
|
pvt = (ct.ci[level].scope == CACHE_SCOPE_PRIVATE) ? 1 : 0;
|
|
ctype = get_cache_type(&ct.ci[0], level);
|
|
if (ctype == CACHE_TYPE_SEPARATE) {
|
|
ci_leaf_init(this_leaf++, pvt, CACHE_TYPE_DATA, level, cpu);
|
|
ci_leaf_init(this_leaf++, pvt, CACHE_TYPE_INST, level, cpu);
|
|
} else {
|
|
ci_leaf_init(this_leaf++, pvt, ctype, level, cpu);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|