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generic-poky/meta/packages/linux/linux-omap-2.6.29/cache-display-fix.patch

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On Tue, 2008-07-01 at 06:23 +0100, Dirk Behme wrote:
> Catalin Marinas wrote:
> > But, anyway, if you want a patch, Harry is updating it to a recent
> > kernel.
>
> Any news on this? I think there are some people wanting a patch ;)
See below for a preliminary patch updated to 2.6.26-rc8. Note that I
don't plan to submit it in its current form but clean it up a bit first.
Show the cache type of ARMv7 CPUs
From: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
arch/arm/kernel/setup.c | 137 +++++++++++++++++++++++++++++++++++++++++++++-
include/asm-arm/system.h | 18 ++++++
2 files changed, 153 insertions(+), 2 deletions(-)
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 5ae0eb2..0cd238d 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -256,6 +256,24 @@ static const char *proc_arch[] = {
"?(17)",
};
+static const char *v7_cache_policy[4] = {
+ "reserved",
+ "AVIVT",
+ "VIPT",
+ "PIPT",
+};
+
+static const char *v7_cache_type[8] = {
+ "none",
+ "instruction only",
+ "data only",
+ "separate instruction and data",
+ "unified",
+ "unknown type",
+ "unknown type",
+ "unknown type",
+};
+
#define CACHE_TYPE(x) (((x) >> 25) & 15)
#define CACHE_S(x) ((x) & (1 << 24))
#define CACHE_DSIZE(x) (((x) >> 12) & 4095) /* only if S=1 */
@@ -266,6 +284,22 @@ static const char *proc_arch[] = {
#define CACHE_M(y) ((y) & (1 << 2))
#define CACHE_LINE(y) ((y) & 3)
+#define CACHE_TYPE_V7(x) (((x) >> 14) & 3)
+#define CACHE_UNIFIED(x) ((((x) >> 27) & 7)+1)
+#define CACHE_COHERENT(x) ((((x) >> 24) & 7)+1)
+
+#define CACHE_ID_LEVEL_MASK 7
+#define CACHE_ID_LEVEL_BITS 3
+
+#define CACHE_LINE_V7(v) ((1 << (((v) & 7)+4)))
+#define CACHE_ASSOC_V7(v) ((((v) >> 3) & ((1<<10)-1))+1)
+#define CACHE_SETS_V7(v) ((((v) >> 13) & ((1<<15)-1))+1)
+#define CACHE_SIZE_V7(v) (CACHE_LINE_V7(v)*CACHE_ASSOC_V7(v)*CACHE_SETS_V7(v))
+#define CACHE_WA_V7(v) (((v) & (1<<28)) != 0)
+#define CACHE_RA_V7(v) (((v) & (1<<29)) != 0)
+#define CACHE_WB_V7(v) (((v) & (1<<30)) != 0)
+#define CACHE_WT_V7(v) (((v) & (1<<31)) != 0)
+
static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
{
unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
@@ -279,11 +313,57 @@ static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
CACHE_LINE(cache)));
}
+static void dump_v7_cache(const char *type, int cpu, unsigned int level)
+{
+ unsigned int cachesize;
+
+ write_extended_cpuid(2,0,0,0,level); /* Set the cache size selection register */
+ write_extended_cpuid(0,7,5,4,0); /* Prefetch flush to wait for above */
+ cachesize = read_extended_cpuid(1,0,0,0);
+
+ printk("CPU%u: %s cache: %d bytes, associativity %d, %d byte lines, %d sets,\n supports%s%s%s%s\n",
+ cpu, type,
+ CACHE_SIZE_V7(cachesize),CACHE_ASSOC_V7(cachesize),
+ CACHE_LINE_V7(cachesize),CACHE_SETS_V7(cachesize),
+ CACHE_WA_V7(cachesize) ? " WA" : "",
+ CACHE_RA_V7(cachesize) ? " RA" : "",
+ CACHE_WB_V7(cachesize) ? " WB" : "",
+ CACHE_WT_V7(cachesize) ? " WT" : "");
+}
+
static void __init dump_cpu_info(int cpu)
{
unsigned int info = read_cpuid(CPUID_CACHETYPE);
- if (info != processor_id) {
+ if (info != processor_id && (info & (1 << 31))) {
+ /* ARMv7 style of cache info register */
+ unsigned int id = read_extended_cpuid(1,0,0,1);
+ unsigned int level = 0;
+ printk("CPU%u: L1 I %s cache. Caches unified at level %u, coherent at level %u\n",
+ cpu,
+ v7_cache_policy[CACHE_TYPE_V7(info)],
+ CACHE_UNIFIED(id),
+ CACHE_COHERENT(id));
+
+ while (id & CACHE_ID_LEVEL_MASK) {
+ printk("CPU%u: Level %u cache is %s\n",
+ cpu, (level >> 1)+1, v7_cache_type[id & CACHE_ID_LEVEL_MASK]);
+
+ if (id & 1) {
+ /* Dump I at this level */
+ dump_v7_cache("I", cpu, level | 1);
+ }
+
+ if (id & (4 | 2)) {
+ /* Dump D or unified at this level */
+ dump_v7_cache((id & 4) ? "unified" : "D", cpu, level);
+ }
+
+ /* Next level out */
+ level += 2;
+ id >>= CACHE_ID_LEVEL_BITS;
+ }
+ } else if (info != processor_id) {
printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
cache_types[CACHE_TYPE(info)]);
if (CACHE_S(info)) {
@@ -916,6 +996,30 @@ c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
CACHE_LINE(cache)));
}
+static void c_show_v7_cache(struct seq_file *m, const char *type, unsigned int levelselect)
+{
+ unsigned int cachesize;
+ unsigned int level = (levelselect >> 1) + 1;
+
+ write_extended_cpuid(2,0,0,0,levelselect); /* Set the cache size selection register */
+ write_extended_cpuid(0,7,5,4,0); /* Prefetch flush to wait for above */
+ cachesize = read_extended_cpuid(1,0,0,0);
+
+ seq_printf(m, "L%u %s size\t\t: %d bytes\n"
+ "L%u %s assoc\t\t: %d\n"
+ "L%u %s line length\t: %d\n"
+ "L%u %s sets\t\t: %d\n"
+ "L%u %s supports\t\t:%s%s%s%s\n",
+ level, type, CACHE_SIZE_V7(cachesize),
+ level, type, CACHE_ASSOC_V7(cachesize),
+ level, type, CACHE_LINE_V7(cachesize),
+ level, type, CACHE_SETS_V7(cachesize),
+ level, type, CACHE_WA_V7(cachesize) ? " WA" : "",
+ CACHE_RA_V7(cachesize) ? " RA" : "",
+ CACHE_WB_V7(cachesize) ? " WB" : "",
+ CACHE_WT_V7(cachesize) ? " WT" : "");
+}
+
static int c_show(struct seq_file *m, void *v)
{
int i;
@@ -971,7 +1075,36 @@ static int c_show(struct seq_file *m, void *v)
{
unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
- if (cache_info != processor_id) {
+ if (cache_info != processor_id && (cache_info & (1<<31))) {
+ /* V7 style of cache info register */
+ unsigned int id = read_extended_cpuid(1,0,0,1);
+ unsigned int levelselect = 0;
+ seq_printf(m, "L1 I cache\t:%s\n"
+ "Cache unification level\t: %u\n"
+ "Cache coherency level\t: %u\n",
+ v7_cache_policy[CACHE_TYPE_V7(cache_info)],
+ CACHE_UNIFIED(id),
+ CACHE_COHERENT(id));
+
+ while (id & CACHE_ID_LEVEL_MASK) {
+ seq_printf(m, "Level %u cache\t\t: %s\n",
+ (levelselect >> 1)+1, v7_cache_type[id & CACHE_ID_LEVEL_MASK]);
+
+ if (id & 1) {
+ /* Dump I at this level */
+ c_show_v7_cache(m, "I", levelselect | 1);
+ }
+
+ if (id & (4 | 2)) {
+ /* Dump D or unified at this level */
+ c_show_v7_cache(m, (id & 4) ? "cache" : "D", levelselect);
+ }
+
+ /* Next level out */
+ levelselect += 2;
+ id >>= CACHE_ID_LEVEL_BITS;
+ }
+ } else if (cache_info != processor_id) {
seq_printf(m, "Cache type\t: %s\n"
"Cache clean\t: %s\n"
"Cache lockdown\t: %s\n"
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 514af79..704738e 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -74,6 +74,24 @@
: "cc"); \
__val; \
})
+#define read_extended_cpuid(op1,op2,op3,op4) \
+ ({ \
+ unsigned int __val; \
+ asm("mrc p15," __stringify(op1) ",%0,c" __stringify(op2)",c" __stringify(op3)"," __stringify(op4) \
+ : "=r" (__val) \
+ : \
+ : "cc"); \
+ __val; \
+ })
+
+#define write_extended_cpuid(op1,op2,op3,op4,v) \
+ ({ \
+ unsigned int __val = v; \
+ asm("mcr p15," __stringify(op1) ",%0,c" __stringify(op2)",c" __stringify(op3)"," __stringify(op4) \
+ : \
+ : "r" (__val) \
+ : "cc"); \
+ })
#else
extern unsigned int processor_id;
#define read_cpuid(reg) (processor_id)
--
Catalin
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