--- /dev/null
+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/include/asm-arm/system.h b/include/asm-arm/system.h
+index 514af79..704738e 100644
+--- a/include/asm-arm/system.h
++++ b/include/asm-arm/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
+
+
projects / vuplus_openembedded / commitdiff