sparc64: Add generic interface for registering a dimm printing handler.

The way to do this varies by platform type and the exact memory
controller the cpu uses.

For Spitfire cpus we currently just use prom_getunumber() and hope
that works.

For Cheetah cpus we have a memory controller driver that can
compute this information.

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

1 files changed, 54 insertions, 8 deletions

diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index 3d924121c796..17880ccfa3cd 100644
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -37,6 +37,7 @@
 #include <asm/timer.h>
 #include <asm/head.h>
 #include <asm/prom.h>
+#include <asm/memctrl.h>
 
 #include "entry.h"
 #include "kstack.h"
@@ -128,6 +129,55 @@ void do_BUG(const char *file, int line)
 }
 #endif
 
+static DEFINE_SPINLOCK(dimm_handler_lock);
+static dimm_printer_t dimm_handler;
+
+static int sprintf_dimm(int synd_code, unsigned long paddr, char *buf, int buflen)
+{
+        unsigned long flags;
+        int ret = -ENODEV;
+
+        spin_lock_irqsave(&dimm_handler_lock, flags);
+        if (dimm_handler) {
+                ret = dimm_handler(synd_code, paddr, buf, buflen);
+        } else if (tlb_type == spitfire) {
+                if (prom_getunumber(synd_code, paddr, buf, buflen) == -1)
+                        ret = -EINVAL;
+                else
+                        ret = 0;
+        } else
+                ret = -ENODEV;
+        spin_unlock_irqrestore(&dimm_handler_lock, flags);
+
+        return ret;
+}
+
+int register_dimm_printer(dimm_printer_t func)
+{
+        unsigned long flags;
+        int ret = 0;
+
+        spin_lock_irqsave(&dimm_handler_lock, flags);
+        if (!dimm_handler)
+                dimm_handler = func;
+        else
+                ret = -EEXIST;
+        spin_unlock_irqrestore(&dimm_handler_lock, flags);
+
+        return ret;
+}
+
+void unregister_dimm_printer(dimm_printer_t func)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&dimm_handler_lock, flags);
+        if (dimm_handler == func)
+                dimm_handler = NULL;
+        spin_unlock_irqrestore(&dimm_handler_lock, flags);
+}
+
+
 void spitfire_insn_access_exception(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar)
 {
         siginfo_t info;
@@ -375,8 +425,7 @@ static void spitfire_log_udb_syndrome(unsigned long afar, unsigned long udbh, un
 
         if (udbl & bit) {
                 scode = ecc_syndrome_table[udbl & 0xff];
-                if (prom_getunumber(scode, afar,
-                                    memmod_str, sizeof(memmod_str)) == -1)
+                if (sprintf_dimm(scode, afar, memmod_str, sizeof(memmod_str)) < 0)
                         p = syndrome_unknown;
                 else
                         p = memmod_str;
@@ -387,8 +436,7 @@ static void spitfire_log_udb_syndrome(unsigned long afar, unsigned long udbh, un
 
         if (udbh & bit) {
                 scode = ecc_syndrome_table[udbh & 0xff];
-                if (prom_getunumber(scode, afar,
-                                    memmod_str, sizeof(memmod_str)) == -1)
+                if (sprintf_dimm(scode, afar, memmod_str, sizeof(memmod_str)) < 0)
                         p = syndrome_unknown;
                 else
                         p = memmod_str;
@@ -1061,8 +1109,6 @@ static const char *cheetah_get_string(unsigned long bit)
         return "???";
 }
 
-extern int chmc_getunumber(int, unsigned long, char *, int);
-
 static void cheetah_log_errors(struct pt_regs *regs, struct cheetah_err_info *info,
                                unsigned long afsr, unsigned long afar, int recoverable)
 {
@@ -1104,7 +1150,7 @@ static void cheetah_log_errors(struct pt_regs *regs, struct cheetah_err_info *in
 
                 syndrome = (afsr & CHAFSR_E_SYNDROME) >> CHAFSR_E_SYNDROME_SHIFT;
                 syndrome = cheetah_ecc_syntab[syndrome];
-                ret = chmc_getunumber(syndrome, afar, unum, sizeof(unum));
+                ret = sprintf_dimm(syndrome, afar, unum, sizeof(unum));
                 if (ret != -1)
                         printk("%s" "ERROR(%d): AFAR E-syndrome [%s]\n",
                                (recoverable ? KERN_WARNING : KERN_CRIT),
@@ -1115,7 +1161,7 @@ static void cheetah_log_errors(struct pt_regs *regs, struct cheetah_err_info *in
 
                 syndrome = (afsr & CHAFSR_M_SYNDROME) >> CHAFSR_M_SYNDROME_SHIFT;
                 syndrome = cheetah_mtag_syntab[syndrome];
-                ret = chmc_getunumber(syndrome, afar, unum, sizeof(unum));
+                ret = sprintf_dimm(syndrome, afar, unum, sizeof(unum));
                 if (ret != -1)
                         printk("%s" "ERROR(%d): AFAR M-syndrome [%s]\n",
                                (recoverable ? KERN_WARNING : KERN_CRIT),