linux-omap2 git: enhance /proc/cpuinfo cache info. RMK doesn't like it, but who cares?

2 files changed, 240 insertions, 1 deletions

diff --git a/packages/linux/linux-omap2-git/beagleboard/cache-display-fix.patch b/packages/linux/linux-omap2-git/beagleboard/cache-display-fix.patch
new file mode 100644
index 0000000000..c96b95f2f4
--- /dev/null
+++ b/packages/linux/linux-omap2-git/beagleboard/cache-display-fix.patch
@@ -0,0 +1,238 @@
+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
+
+
diff --git a/packages/linux/linux-omap2_git.bb b/packages/linux/linux-omap2_git.bb
index 0b3155aaa5..69d3415faf 100644
--- a/packages/linux/linux-omap2_git.bb
+++ b/packages/linux/linux-omap2_git.bb
@@ -5,7 +5,7 @@ FILESDIR = "${@os.path.dirname(bb.data.getVar('FILE',d,1))}/linux-omap2-git/${MA
 SRCREV = "7786cd7a00ae0b18923185789380a88052f4eee7"
 
 PV = "2.6.25+2.6.26-rc9+${PR}+git${SRCREV}"
-PR = "r42"
+PR = "r43"
 
 SRC_URI = "git://source.mvista.com/git/linux-omap-2.6.git;protocol=git \
 	   file://defconfig"
@@ -28,6 +28,7 @@ SRC_URI_append_beagleboard = " file://no-harry-potter.diff;patch=1 \
            file://05-fix-display-panning.diff;patch=1 \
            file://06-ensure-fclk.diff;patch=1 \
            file://07-set-burst-size.diff;patch=1 \
+           file://cache-display-fix.patch;patch=1 \
 "
 
 SRC_URI_append_omap3evm = " file://no-harry-potter.diff;patch=1 \