[SPARC64]: Probe D/I/E-cache config and use.

At boot time, determine the D-cache, I-cache and E-cache size and
line-size.  Use them in cache flushes when appropriate.

This change was motivated by discovering that the D-cache on
UltraSparc-IIIi and later are 64K not 32K, and the flushes done by the
Cheetah error handlers were assuming a 32K size.

There are still some pieces of code that are hard coding things and
will need to be fixed up at some point.

While we're here, fix the D-cache and I-cache parity error handlers
to run with interrupts disabled, and when the trap occurs at trap
level > 1 log the event via a counter displayed in /proc/cpuinfo.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 27 insertions, 13 deletions

diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index b280b2ef674f..f8e7005fede9 100644
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -869,14 +869,19 @@ static void cheetah_flush_ecache_line(unsigned long physaddr)
  */
 static void __cheetah_flush_icache(void)
 {
-        unsigned long i;
+        unsigned int icache_size, icache_line_size;
+        unsigned long addr;
+
+        icache_size = local_cpu_data().icache_size;
+        icache_line_size = local_cpu_data().icache_line_size;
 
         /* Clear the valid bits in all the tags. */
-        for (i = 0; i < (1 << 15); i += (1 << 5)) {
+        for (addr = 0; addr < icache_size; addr += icache_line_size) {
                 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
                                      "membar #Sync"
                                      : /* no outputs */
-                                     : "r" (i | (2 << 3)), "i" (ASI_IC_TAG));
+                                     : "r" (addr | (2 << 3)),
+                                       "i" (ASI_IC_TAG));
         }
 }
 
@@ -904,13 +909,17 @@ static void cheetah_flush_icache(void)
 
 static void cheetah_flush_dcache(void)
 {
-        unsigned long i;
+        unsigned int dcache_size, dcache_line_size;
+        unsigned long addr;
+
+        dcache_size = local_cpu_data().dcache_size;
+        dcache_line_size = local_cpu_data().dcache_line_size;
 
-        for (i = 0; i < (1 << 16); i += (1 << 5)) {
+        for (addr = 0; addr < dcache_size; addr += dcache_line_size) {
                 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
                                      "membar #Sync"
                                      : /* no outputs */
-                                     : "r" (i), "i" (ASI_DCACHE_TAG));
+                                     : "r" (addr), "i" (ASI_DCACHE_TAG));
         }
 }
 
@@ -921,24 +930,29 @@ static void cheetah_flush_dcache(void)
  */
 static void cheetah_plus_zap_dcache_parity(void)
 {
-        unsigned long i;
+        unsigned int dcache_size, dcache_line_size;
+        unsigned long addr;
+
+        dcache_size = local_cpu_data().dcache_size;
+        dcache_line_size = local_cpu_data().dcache_line_size;
 
-        for (i = 0; i < (1 << 16); i += (1 << 5)) {
-                unsigned long tag = (i >> 14);
-                unsigned long j;
+        for (addr = 0; addr < dcache_size; addr += dcache_line_size) {
+                unsigned long tag = (addr >> 14);
+                unsigned long line;
 
                 __asm__ __volatile__("membar    #Sync\n\t"
                                      "stxa      %0, [%1] %2\n\t"
                                      "membar    #Sync"
                                      : /* no outputs */
-                                     : "r" (tag), "r" (i),
+                                     : "r" (tag), "r" (addr),
                                        "i" (ASI_DCACHE_UTAG));
-                for (j = i; j < i + (1 << 5); j += (1 << 3))
+                for (line = addr; line < addr + dcache_line_size; line += 8)
                         __asm__ __volatile__("membar    #Sync\n\t"
                                              "stxa      %%g0, [%0] %1\n\t"
                                              "membar    #Sync"
                                              : /* no outputs */
-                                             : "r" (j), "i" (ASI_DCACHE_DATA));
+                                             : "r" (line),
+                                               "i" (ASI_DCACHE_DATA));
         }
 }