[PATCH] powerpc: Remove oprofile spinlock backtrace code

Remove oprofile spinlock backtrace code now we have proper calltrace
support. Also make MMCRA sihv and sipr bits a variable since they may
change in future cpus. Finally, MMCRA should be a 64bit quantity.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 9 insertions, 44 deletions

diff --git a/arch/powerpc/oprofile/common.c b/arch/powerpc/oprofile/common.c
index 2b9143b0f6ba..5b1de7e8041e 100644
--- a/arch/powerpc/oprofile/common.c
+++ b/arch/powerpc/oprofile/common.c
@@ -117,17 +117,10 @@ static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
 
         oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
         oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
-#ifdef CONFIG_PPC64
-        oprofilefs_create_ulong(sb, root, "backtrace_spinlocks",
-                                &sys.backtrace_spinlocks);
-#endif
 
         /* Default to tracing both kernel and user */
         sys.enable_kernel = 1;
         sys.enable_user = 1;
-#ifdef CONFIG_PPC64
-        sys.backtrace_spinlocks = 0;
-#endif
 
         return 0;
 }
diff --git a/arch/powerpc/oprofile/op_model_power4.c b/arch/powerpc/oprofile/op_model_power4.c
index 38db2efef3bc..4c2beab1fdc1 100644
--- a/arch/powerpc/oprofile/op_model_power4.c
+++ b/arch/powerpc/oprofile/op_model_power4.c
@@ -25,18 +25,14 @@ static unsigned long reset_value[OP_MAX_COUNTER];
 
 static int oprofile_running;
 static int mmcra_has_sihv;
+/* Unfortunately these bits vary between CPUs */
+static unsigned long mmcra_sihv = MMCRA_SIHV;
+static unsigned long mmcra_sipr = MMCRA_SIPR;
 
 /* mmcr values are set in power4_reg_setup, used in power4_cpu_setup */
 static u32 mmcr0_val;
 static u64 mmcr1_val;
-static u32 mmcra_val;
-
-/*
- * Since we do not have an NMI, backtracing through spinlocks is
- * only a best guess. In light of this, allow it to be disabled at
- * runtime.
- */
-static int backtrace_spinlocks;
+static u64 mmcra_val;
 
 static void power4_reg_setup(struct op_counter_config *ctr,
                              struct op_system_config *sys,
@@ -63,8 +59,6 @@ static void power4_reg_setup(struct op_counter_config *ctr,
         mmcr1_val = sys->mmcr1;
         mmcra_val = sys->mmcra;
 
-        backtrace_spinlocks = sys->backtrace_spinlocks;
-
         for (i = 0; i < cur_cpu_spec->num_pmcs; ++i)
                 reset_value[i] = 0x80000000UL - ctr[i].count;
 
@@ -197,25 +191,6 @@ static void __attribute_used__ kernel_unknown_bucket(void)
 {
 }
 
-static unsigned long check_spinlock_pc(struct pt_regs *regs,
-                                       unsigned long profile_pc)
-{
-        unsigned long pc = instruction_pointer(regs);
-
-        /*
-         * If both the SIAR (sampled instruction) and the perfmon exception
-         * occurred in a spinlock region then we account the sample to the
-         * calling function. This isnt 100% correct, we really need soft
-         * IRQ disable so we always get the perfmon exception at the
-         * point at which the SIAR is set.
-         */
-        if (backtrace_spinlocks && in_lock_functions(pc) &&
-                        in_lock_functions(profile_pc))
-                return regs->link;
-        else
-                return profile_pc;
-}
-
 /*
  * On GQ and newer the MMCRA stores the HV and PR bits at the time
  * the SIAR was sampled. We use that to work out if the SIAR was sampled in
@@ -228,17 +203,17 @@ static unsigned long get_pc(struct pt_regs *regs)
 
         /* Cant do much about it */
         if (!mmcra_has_sihv)
-                return check_spinlock_pc(regs, pc);
+                return pc;
 
         mmcra = mfspr(SPRN_MMCRA);
 
         /* Were we in the hypervisor? */
-        if (firmware_has_feature(FW_FEATURE_LPAR) && (mmcra & MMCRA_SIHV))
+        if (firmware_has_feature(FW_FEATURE_LPAR) && (mmcra & mmcra_sihv))
                 /* function descriptor madness */
                 return *((unsigned long *)hypervisor_bucket);
 
         /* We were in userspace, nothing to do */
-        if (mmcra & MMCRA_SIPR)
+        if (mmcra & mmcra_sipr)
                 return pc;
 
 #ifdef CONFIG_PPC_RTAS
@@ -257,7 +232,7 @@ static unsigned long get_pc(struct pt_regs *regs)
                 /* function descriptor madness */
                 return *((unsigned long *)kernel_unknown_bucket);
 
-        return check_spinlock_pc(regs, pc);
+        return pc;
 }
 
 static int get_kernel(unsigned long pc)
@@ -268,7 +243,7 @@ static int get_kernel(unsigned long pc)
                 is_kernel = is_kernel_addr(pc);
         } else {
                 unsigned long mmcra = mfspr(SPRN_MMCRA);
-                is_kernel = ((mmcra & MMCRA_SIPR) == 0);
+                is_kernel = ((mmcra & mmcra_sipr) == 0);
         }
 
         return is_kernel;
diff --git a/include/asm-powerpc/oprofile_impl.h b/include/asm-powerpc/oprofile_impl.h
index aa180e907a67..5b33994cd488 100644
--- a/include/asm-powerpc/oprofile_impl.h
+++ b/include/asm-powerpc/oprofile_impl.h
@@ -35,9 +35,6 @@ struct op_system_config {
 #endif
         unsigned long enable_kernel;
         unsigned long enable_user;
-#ifdef CONFIG_PPC64
-        unsigned long backtrace_spinlocks;
-#endif
 };
 
 /* Per-arch configuration */