4 files changed, 97 insertions, 10 deletions

diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index 856ef1a832b9..f78866367b70 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -90,15 +90,15 @@ void __kprobes arch_remove_kprobe(struct kprobe *p)
 
 static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
 {
-        kprobe_opcode_t insn = *p->ainsn.insn;
-
         regs->msr |= MSR_SE;
 
-        /* single step inline if it is a trap variant */
-        if (is_trap(insn))
-                regs->nip = (unsigned long)p->addr;
-        else
-                regs->nip = (unsigned long)p->ainsn.insn;
+        /*
+         * On powerpc we should single step on the original
+         * instruction even if the probed insn is a trap
+         * variant as values in regs could play a part in
+         * if the trap is taken or not
+         */
+        regs->nip = (unsigned long)p->ainsn.insn;
 }
 
 static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 1cb69e8fb0b1..9a07f97f0712 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -885,6 +885,74 @@ void __init unflatten_device_tree(void)
         DBG(" <- unflatten_device_tree()\n");
 }
 
+/*
+ * ibm,pa-features is a per-cpu property that contains a string of
+ * attribute descriptors, each of which has a 2 byte header plus up
+ * to 254 bytes worth of processor attribute bits.  First header
+ * byte specifies the number of bytes following the header.
+ * Second header byte is an "attribute-specifier" type, of which
+ * zero is the only currently-defined value.
+ * Implementation:  Pass in the byte and bit offset for the feature
+ * that we are interested in.  The function will return -1 if the
+ * pa-features property is missing, or a 1/0 to indicate if the feature
+ * is supported/not supported.  Note that the bit numbers are
+ * big-endian to match the definition in PAPR.
+ */
+static struct ibm_pa_feature {
+        unsigned long   cpu_features;   /* CPU_FTR_xxx bit */
+        unsigned int    cpu_user_ftrs;  /* PPC_FEATURE_xxx bit */
+        unsigned char   pabyte;         /* byte number in ibm,pa-features */
+        unsigned char   pabit;          /* bit number (big-endian) */
+        unsigned char   invert;         /* if 1, pa bit set => clear feature */
+} ibm_pa_features[] __initdata = {
+        {0, PPC_FEATURE_HAS_MMU,        0, 0, 0},
+        {0, PPC_FEATURE_HAS_FPU,        0, 1, 0},
+        {CPU_FTR_SLB, 0,                0, 2, 0},
+        {CPU_FTR_CTRL, 0,               0, 3, 0},
+        {CPU_FTR_NOEXECUTE, 0,          0, 6, 0},
+        {CPU_FTR_NODSISRALIGN, 0,       1, 1, 1},
+        {CPU_FTR_CI_LARGE_PAGE, 0,      1, 2, 0},
+};
+
+static void __init check_cpu_pa_features(unsigned long node)
+{
+        unsigned char *pa_ftrs;
+        unsigned long len, tablelen, i, bit;
+
+        pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
+        if (pa_ftrs == NULL)
+                return;
+
+        /* find descriptor with type == 0 */
+        for (;;) {
+                if (tablelen < 3)
+                        return;
+                len = 2 + pa_ftrs[0];
+                if (tablelen < len)
+                        return;         /* descriptor 0 not found */
+                if (pa_ftrs[1] == 0)
+                        break;
+                tablelen -= len;
+                pa_ftrs += len;
+        }
+
+        /* loop over bits we know about */
+        for (i = 0; i < ARRAY_SIZE(ibm_pa_features); ++i) {
+                struct ibm_pa_feature *fp = &ibm_pa_features[i];
+
+                if (fp->pabyte >= pa_ftrs[0])
+                        continue;
+                bit = (pa_ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
+                if (bit ^ fp->invert) {
+                        cur_cpu_spec->cpu_features |= fp->cpu_features;
+                        cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
+                } else {
+                        cur_cpu_spec->cpu_features &= ~fp->cpu_features;
+                        cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
+                }
+        }
+}
+
 static int __init early_init_dt_scan_cpus(unsigned long node,
                                           const char *uname, int depth,
                                           void *data)
@@ -969,6 +1037,8 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
         }
 #endif /* CONFIG_ALTIVEC */
 
+        check_cpu_pa_features(node);
+
 #ifdef CONFIG_PPC_PSERIES
         if (nthreads > 1)
                 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index bcb83574335b..4a677d1bd4ef 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -538,7 +538,7 @@ void do_syscall_trace_enter(struct pt_regs *regs)
                 do_syscall_trace();
 
         if (unlikely(current->audit_context))
-                audit_syscall_entry(current,
+                audit_syscall_entry(
 #ifdef CONFIG_PPC32
                                     AUDIT_ARCH_PPC,
 #else
@@ -556,8 +556,7 @@ void do_syscall_trace_leave(struct pt_regs *regs)
 #endif
 
         if (unlikely(current->audit_context))
-                audit_syscall_exit(current,
-                                   (regs->ccr&0x1000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
+                audit_syscall_exit((regs->ccr&0x1000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
                                    regs->result);
 
         if ((test_thread_flag(TIF_SYSCALL_TRACE)
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index ed737cacf92d..5bc2585c8036 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -322,13 +322,31 @@ static void register_nodes(void)
                 }
         }
 }
+
+int sysfs_add_device_to_node(struct sys_device *dev, int nid)
+{
+        struct node *node = &node_devices[nid];
+        return sysfs_create_link(&node->sysdev.kobj, &dev->kobj,
+                        kobject_name(&dev->kobj));
+}
+
+void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
+{
+        struct node *node = &node_devices[nid];
+        sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj));
+}
+
 #else
 static void register_nodes(void)
 {
         return;
 }
+
 #endif
 
+EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
+EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
+
 /* Only valid if CPU is present. */
 static ssize_t show_physical_id(struct sys_device *dev, char *buf)
 {