x86: Add cpu_detect_cache_sizes to init_intel() add Quark legacy_cache()

Intel processors which don't report cache information via cpuid(2)
or cpuid(4) need quirk code in the legacy_cache_size callback to
report this data. For Intel that callback is is intel_size_cache().

This patch enables calling of cpu_detect_cache_sizes() inside of
init_intel() and hence the calling of the legacy_cache callback in
intel_size_cache(). Adding this call will ensure that PIII Tualatin
currently in intel_size_cache() and Quark SoC X1000 being added to
intel_size_cache() in this patch will report their respective cache
sizes.

This model of calling cpu_detect_cache_sizes() is consistent with
AMD/Via/Cirix/Transmeta and Centaur.

Also added is a string to idenitfy the Quark as Quark SoC X1000
giving better and more descriptive output via /proc/cpuinfo

Adding cpu_detect_cache_sizes to init_intel() will enable calling
of intel_size_cache() on Intel processors which currently no code
can reach. Therefore this patch will also re-enable reporting
of PIII Tualatin cache size information as well as add
Quark SoC X1000 support.

Comment text and cache flow logic suggested by Thomas Gleixner

Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Cc: davej@redhat.com
Cc: hmh@hmh.eng.br
Link: http://lkml.kernel.org/r/1412641189-12415-3-git-send-email-pure.logic@nexus-software.ie
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 16 insertions, 1 deletions

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 50ce7519ccef..1ef456273172 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -397,6 +397,13 @@ static void init_intel(struct cpuinfo_x86 *c)
         }
 
         l2 = init_intel_cacheinfo(c);
+
+        /* Detect legacy cache sizes if init_intel_cacheinfo did not */
+        if (l2 == 0) {
+                cpu_detect_cache_sizes(c);
+                l2 = c->x86_cache_size;
+        }
+
         if (c->cpuid_level > 9) {
                 unsigned eax = cpuid_eax(10);
                 /* Check for version and the number of counters */
@@ -500,6 +507,13 @@ static unsigned int intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
          */
         if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
                 size = 256;
+
+        /*
+         * Intel Quark SoC X1000 contains a 4-way set associative
+         * 16K cache with a 16 byte cache line and 256 lines per tag
+         */
+        if ((c->x86 == 5) && (c->x86_model == 9))
+                size = 16;
         return size;
 }
 #endif
@@ -701,7 +715,8 @@ static const struct cpu_dev intel_cpu_dev = {
                           [3] = "OverDrive PODP5V83",
                           [4] = "Pentium MMX",
                           [7] = "Mobile Pentium 75 - 200",
-                          [8] = "Mobile Pentium MMX"
+                          [8] = "Mobile Pentium MMX",
+                          [9] = "Quark SoC X1000",
                   }
                 },
                 { .family = 6, .model_names =