13 files changed, 517 insertions, 142 deletions

diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 81c8324a4a3c..1cbbf7033641 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -148,7 +148,7 @@ transfer_to_handler:
         /* Check to see if the dbcr0 register is set up to debug.  Use the
            internal debug mode bit to do this. */
         lwz     r12,THREAD_DBCR0(r12)
-        andis.  r12,r12,(DBCR0_IDM  | DBSR_DAC1R | DBSR_DAC1W)@h
+        andis.  r12,r12,DBCR0_IDM@h
         beq+    3f
         /* From user and task is ptraced - load up global dbcr0 */
         li      r12,-1                  /* clear all pending debug events */
@@ -292,7 +292,7 @@ syscall_exit_cont:
         /* If the process has its own DBCR0 value, load it up.  The internal
            debug mode bit tells us that dbcr0 should be loaded. */
         lwz     r0,THREAD+THREAD_DBCR0(r2)
-        andis.  r10,r0,(DBCR0_IDM  | DBSR_DAC1R | DBSR_DAC1W)@h
+        andis.  r10,r0,DBCR0_IDM@h
         bnel-   load_dbcr0
 #endif
 #ifdef CONFIG_44x
@@ -343,7 +343,12 @@ syscall_dotrace:
         stw     r0,_TRAP(r1)
         addi    r3,r1,STACK_FRAME_OVERHEAD
         bl      do_syscall_trace_enter
-        lwz     r0,GPR0(r1)     /* Restore original registers */
+        /*
+         * Restore argument registers possibly just changed.
+         * We use the return value of do_syscall_trace_enter
+         * for call number to look up in the table (r0).
+         */
+        mr      r0,r3
         lwz     r3,GPR3(r1)
         lwz     r4,GPR4(r1)
         lwz     r5,GPR5(r1)
@@ -720,7 +725,7 @@ restore_user:
         /* Check whether this process has its own DBCR0 value.  The internal
            debug mode bit tells us that dbcr0 should be loaded. */
         lwz     r0,THREAD+THREAD_DBCR0(r2)
-        andis.  r10,r0,(DBCR0_IDM  | DBSR_DAC1R | DBSR_DAC1W)@h
+        andis.  r10,r0,DBCR0_IDM@h
         bnel-   load_dbcr0
 #endif
 
@@ -1055,8 +1060,8 @@ do_user_signal:			/* r10 contains MSR_KERNEL here */
         SAVE_NVGPRS(r1)
         rlwinm  r3,r3,0,0,30
         stw     r3,_TRAP(r1)
-2:      li      r3,0
-        addi    r4,r1,STACK_FRAME_OVERHEAD
+2:      addi    r3,r1,STACK_FRAME_OVERHEAD
+        mr      r4,r9
         bl      do_signal
         REST_NVGPRS(r1)
         b       recheck
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index d7369243ae44..2d802e97097c 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -214,7 +214,12 @@ syscall_dotrace:
         bl      .save_nvgprs
         addi    r3,r1,STACK_FRAME_OVERHEAD
         bl      .do_syscall_trace_enter
-        ld      r0,GPR0(r1)     /* Restore original registers */
+        /*
+         * Restore argument registers possibly just changed.
+         * We use the return value of do_syscall_trace_enter
+         * for the call number to look up in the table (r0).
+         */
+        mr      r0,r3
         ld      r3,GPR3(r1)
         ld      r4,GPR4(r1)
         ld      r5,GPR5(r1)
@@ -638,8 +643,7 @@ user_work:
         b       .ret_from_except_lite
 
 1:      bl      .save_nvgprs
-        li      r3,0
-        addi    r4,r1,STACK_FRAME_OVERHEAD
+        addi    r3,r1,STACK_FRAME_OVERHEAD
         bl      .do_signal
         b       .ret_from_except
 
diff --git a/arch/powerpc/kernel/legacy_serial.c b/arch/powerpc/kernel/legacy_serial.c
index 4d96e1db55ee..9ddfaef1a184 100644
--- a/arch/powerpc/kernel/legacy_serial.c
+++ b/arch/powerpc/kernel/legacy_serial.c
@@ -493,18 +493,18 @@ static int __init serial_dev_init(void)
 device_initcall(serial_dev_init);
 
 
+#ifdef CONFIG_SERIAL_8250_CONSOLE
 /*
  * This is called very early, as part of console_init() (typically just after
  * time_init()). This function is respondible for trying to find a good
  * default console on serial ports. It tries to match the open firmware
- * default output with one of the available serial console drivers, either
- * one of the platform serial ports that have been probed earlier by
- * find_legacy_serial_ports() or some more platform specific ones.
+ * default output with one of the available serial console drivers that have
+ * been probed earlier by find_legacy_serial_ports()
  */
 static int __init check_legacy_serial_console(void)
 {
         struct device_node *prom_stdout = NULL;
-        int speed = 0, offset = 0;
+        int i, speed = 0, offset = 0;
         const char *name;
         const u32 *spd;
 
@@ -548,31 +548,20 @@ static int __init check_legacy_serial_console(void)
         if (spd)
                 speed = *spd;
 
-        if (0)
-                ;
-#ifdef CONFIG_SERIAL_8250_CONSOLE
-        else if (strcmp(name, "serial") == 0) {
-                int i;
-                /* Look for it in probed array */
-                for (i = 0; i < legacy_serial_count; i++) {
-                        if (prom_stdout != legacy_serial_infos[i].np)
-                                continue;
-                        offset = i;
-                        speed = legacy_serial_infos[i].speed;
-                        break;
-                }
-                if (i >= legacy_serial_count)
-                        goto not_found;
+        if (strcmp(name, "serial") != 0)
+                goto not_found;
+
+        /* Look for it in probed array */
+        for (i = 0; i < legacy_serial_count; i++) {
+                if (prom_stdout != legacy_serial_infos[i].np)
+                        continue;
+                offset = i;
+                speed = legacy_serial_infos[i].speed;
+                break;
         }
-#endif /* CONFIG_SERIAL_8250_CONSOLE */
-#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
-        else if (strcmp(name, "ch-a") == 0)
-                offset = 0;
-        else if (strcmp(name, "ch-b") == 0)
-                offset = 1;
-#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
-        else
+        if (i >= legacy_serial_count)
                 goto not_found;
+
         of_node_put(prom_stdout);
 
         DBG("Found serial console at ttyS%d\n", offset);
@@ -591,3 +580,4 @@ static int __init check_legacy_serial_console(void)
 }
 console_initcall(check_legacy_serial_console);
 
+#endif /* CONFIG_SERIAL_8250_CONSOLE */
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index db2497ccc111..e030f3bd5024 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -254,7 +254,7 @@ void do_dabr(struct pt_regs *regs, unsigned long address,
                 return;
 
         /* Clear the DAC and struct entries.  One shot trigger */
-#if (defined(CONFIG_44x) || defined(CONFIG_BOOKE))
+#if defined(CONFIG_BOOKE)
         mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~(DBSR_DAC1R | DBSR_DAC1W
                                                         | DBCR0_IDM));
 #endif
@@ -286,7 +286,7 @@ int set_dabr(unsigned long dabr)
         mtspr(SPRN_DABR, dabr);
 #endif
 
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
         mtspr(SPRN_DAC1, dabr);
 #endif
 
@@ -373,7 +373,7 @@ struct task_struct *__switch_to(struct task_struct *prev,
         if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr))
                 set_dabr(new->thread.dabr);
 
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
         /* If new thread DAC (HW breakpoint) is the same then leave it */
         if (new->thread.dabr)
                 set_dabr(new->thread.dabr);
@@ -568,7 +568,7 @@ void flush_thread(void)
                 current->thread.dabr = 0;
                 set_dabr(0);
 
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
                 current->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W);
 #endif
         }
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index c4ab2195b9cb..b72849ac7db3 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -205,8 +205,6 @@ static int __initdata mem_reserve_cnt;
 static cell_t __initdata regbuf[1024];
 
 
-#define MAX_CPU_THREADS 2
-
 /*
  * Error results ... some OF calls will return "-1" on error, some
  * will return 0, some will return either. To simplify, here are
@@ -1339,10 +1337,6 @@ static void __init prom_hold_cpus(void)
         unsigned int reg;
         phandle node;
         char type[64];
-        int cpuid = 0;
-        unsigned int interrupt_server[MAX_CPU_THREADS];
-        unsigned int cpu_threads, hw_cpu_num;
-        int propsize;
         struct prom_t *_prom = &RELOC(prom);
         unsigned long *spinloop
                 = (void *) LOW_ADDR(__secondary_hold_spinloop);
@@ -1386,7 +1380,6 @@ static void __init prom_hold_cpus(void)
                 reg = -1;
                 prom_getprop(node, "reg", &reg, sizeof(reg));
 
-                prom_debug("\ncpuid        = 0x%x\n", cpuid);
                 prom_debug("cpu hw idx   = 0x%x\n", reg);
 
                 /* Init the acknowledge var which will be reset by
@@ -1395,28 +1388,9 @@ static void __init prom_hold_cpus(void)
                  */
                 *acknowledge = (unsigned long)-1;
 
-                propsize = prom_getprop(node, "ibm,ppc-interrupt-server#s",
-                                        &interrupt_server,
-                                        sizeof(interrupt_server));
-                if (propsize < 0) {
-                        /* no property.  old hardware has no SMT */
-                        cpu_threads = 1;
-                        interrupt_server[0] = reg; /* fake it with phys id */
-                } else {
-                        /* We have a threaded processor */
-                        cpu_threads = propsize / sizeof(u32);
-                        if (cpu_threads > MAX_CPU_THREADS) {
-                                prom_printf("SMT: too many threads!\n"
-                                            "SMT: found %x, max is %x\n",
-                                            cpu_threads, MAX_CPU_THREADS);
-                                cpu_threads = 1; /* ToDo: panic? */
-                        }
-                }
-
-                hw_cpu_num = interrupt_server[0];
-                if (hw_cpu_num != _prom->cpu) {
+                if (reg != _prom->cpu) {
                         /* Primary Thread of non-boot cpu */
-                        prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg);
+                        prom_printf("starting cpu hw idx %x... ", reg);
                         call_prom("start-cpu", 3, 0, node,
                                   secondary_hold, reg);
 
@@ -1431,17 +1405,10 @@ static void __init prom_hold_cpus(void)
                 }
 #ifdef CONFIG_SMP
                 else
-                        prom_printf("%x : boot cpu     %x\n", cpuid, reg);
+                        prom_printf("boot cpu hw idx %x\n", reg);
 #endif /* CONFIG_SMP */
-
-                /* Reserve cpu #s for secondary threads.   They start later. */
-                cpuid += cpu_threads;
         }
 
-        if (cpuid > NR_CPUS)
-                prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)
-                            ") exceeded: ignoring extras\n");
-
         prom_debug("prom_hold_cpus: end...\n");
 }
 
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index a5d0e78779c8..6b66cd85b433 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -22,6 +22,7 @@
 #include <linux/errno.h>
 #include <linux/ptrace.h>
 #include <linux/regset.h>
+#include <linux/tracehook.h>
 #include <linux/elf.h>
 #include <linux/user.h>
 #include <linux/security.h>
@@ -717,7 +718,7 @@ void user_disable_single_step(struct task_struct *task)
         struct pt_regs *regs = task->thread.regs;
 
 
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
         /* If DAC then do not single step, skip */
         if (task->thread.dabr)
                 return;
@@ -744,10 +745,11 @@ int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
         if (addr > 0)
                 return -EINVAL;
 
+        /* The bottom 3 bits in dabr are flags */
         if ((data & ~0x7UL) >= TASK_SIZE)
                 return -EIO;
 
-#ifdef CONFIG_PPC64
+#ifndef CONFIG_BOOKE
 
         /* For processors using DABR (i.e. 970), the bottom 3 bits are flags.
          *  It was assumed, on previous implementations, that 3 bits were
@@ -769,7 +771,7 @@ int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
         task->thread.dabr = data;
 
 #endif
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
 
         /* As described above, it was assumed 3 bits were passed with the data
          *  address, but we will assume only the mode bits will be passed
@@ -1013,31 +1015,24 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
         return ret;
 }
 
-static void do_syscall_trace(void)
+/*
+ * We must return the syscall number to actually look up in the table.
+ * This can be -1L to skip running any syscall at all.
+ */
+long do_syscall_trace_enter(struct pt_regs *regs)
 {
-        /* the 0x80 provides a way for the tracing parent to distinguish
-           between a syscall stop and SIGTRAP delivery */
-        ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
-                                 ? 0x80 : 0));
-
-        /*
-         * this isn't the same as continuing with a signal, but it will do
-         * for normal use.  strace only continues with a signal if the
-         * stopping signal is not SIGTRAP.  -brl
-         */
-        if (current->exit_code) {
-                send_sig(current->exit_code, current, 1);
-                current->exit_code = 0;
-        }
-}
+        long ret = 0;
 
-void do_syscall_trace_enter(struct pt_regs *regs)
-{
         secure_computing(regs->gpr[0]);
 
-        if (test_thread_flag(TIF_SYSCALL_TRACE)
-            && (current->ptrace & PT_PTRACED))
-                do_syscall_trace();
+        if (test_thread_flag(TIF_SYSCALL_TRACE) &&
+            tracehook_report_syscall_entry(regs))
+                /*
+                 * Tracing decided this syscall should not happen.
+                 * We'll return a bogus call number to get an ENOSYS
+                 * error, but leave the original number in regs->gpr[0].
+                 */
+                ret = -1L;
 
         if (unlikely(current->audit_context)) {
 #ifdef CONFIG_PPC64
@@ -1055,16 +1050,19 @@ void do_syscall_trace_enter(struct pt_regs *regs)
                                             regs->gpr[5] & 0xffffffff,
                                             regs->gpr[6] & 0xffffffff);
         }
+
+        return ret ?: regs->gpr[0];
 }
 
 void do_syscall_trace_leave(struct pt_regs *regs)
 {
+        int step;
+
         if (unlikely(current->audit_context))
                 audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
                                    regs->result);
 
-        if ((test_thread_flag(TIF_SYSCALL_TRACE)
-             || test_thread_flag(TIF_SINGLESTEP))
-            && (current->ptrace & PT_PTRACED))
-                do_syscall_trace();
+        step = test_thread_flag(TIF_SINGLESTEP);
+        if (step || test_thread_flag(TIF_SYSCALL_TRACE))
+                tracehook_report_syscall_exit(regs, step);
 }
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 61a3f4132087..9cc5a52711e5 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -367,7 +367,6 @@ static void __init cpu_init_thread_core_maps(int tpc)
  * setup_cpu_maps - initialize the following cpu maps:
  *                  cpu_possible_map
  *                  cpu_present_map
- *                  cpu_sibling_map
  *
  * Having the possible map set up early allows us to restrict allocations
  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
@@ -475,29 +474,6 @@ void __init smp_setup_cpu_maps(void)
          */
         cpu_init_thread_core_maps(nthreads);
 }
-
-/*
- * Being that cpu_sibling_map is now a per_cpu array, then it cannot
- * be initialized until the per_cpu areas have been created.  This
- * function is now called from setup_per_cpu_areas().
- */
-void __init smp_setup_cpu_sibling_map(void)
-{
-#ifdef CONFIG_PPC64
-        int i, cpu, base;
-
-        for_each_possible_cpu(cpu) {
-                DBG("Sibling map for CPU %d:", cpu);
-                base = cpu_first_thread_in_core(cpu);
-                for (i = 0; i < threads_per_core; i++) {
-                        cpu_set(base + i, per_cpu(cpu_sibling_map, cpu));
-                        DBG(" %d", base + i);
-                }
-                DBG("\n");
-        }
-
-#endif /* CONFIG_PPC64 */
-}
 #endif /* CONFIG_SMP */
 
 #ifdef CONFIG_PCSPKR_PLATFORM
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 04d8de9f0fc6..8b25f51f03bf 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -611,9 +611,6 @@ void __init setup_per_cpu_areas(void)
                 paca[i].data_offset = ptr - __per_cpu_start;
                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
         }
-
-        /* Now that per_cpu is setup, initialize cpu_sibling_map */
-        smp_setup_cpu_sibling_map();
 }
 #endif
 
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index 7aada783ec6a..a54405ebd7b0 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -9,7 +9,7 @@
  * this archive for more details.
  */
 
-#include <linux/ptrace.h>
+#include <linux/tracehook.h>
 #include <linux/signal.h>
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -112,7 +112,7 @@ static void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka,
         }
 }
 
-int do_signal(sigset_t *oldset, struct pt_regs *regs)
+static int do_signal_pending(sigset_t *oldset, struct pt_regs *regs)
 {
         siginfo_t info;
         int signr;
@@ -147,7 +147,7 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
          */
         if (current->thread.dabr) {
                 set_dabr(current->thread.dabr);
-#if defined(CONFIG_44x) || defined(CONFIG_BOOKE)
+#if defined(CONFIG_BOOKE)
                 mtspr(SPRN_DBCR0, current->thread.dbcr0);
 #endif
         }
@@ -177,11 +177,28 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
                  * its frame, and we can clear the TLF_RESTORE_SIGMASK flag.
                  */
                 current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK;
+
+                /*
+                 * Let tracing know that we've done the handler setup.
+                 */
+                tracehook_signal_handler(signr, &info, &ka, regs,
+                                         test_thread_flag(TIF_SINGLESTEP));
         }
 
         return ret;
 }
 
+void do_signal(struct pt_regs *regs, unsigned long thread_info_flags)
+{
+        if (thread_info_flags & _TIF_SIGPENDING)
+                do_signal_pending(NULL, regs);
+
+        if (thread_info_flags & _TIF_NOTIFY_RESUME) {
+                clear_thread_flag(TIF_NOTIFY_RESUME);
+                tracehook_notify_resume(regs);
+        }
+}
+
 long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
                 unsigned long r5, unsigned long r6, unsigned long r7,
                 unsigned long r8, struct pt_regs *regs)
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index f5ae9fa222ea..5337ca7bb649 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -41,6 +41,7 @@
 #include <asm/smp.h>
 #include <asm/time.h>
 #include <asm/machdep.h>
+#include <asm/cputhreads.h>
 #include <asm/cputable.h>
 #include <asm/system.h>
 #include <asm/mpic.h>
@@ -62,10 +63,12 @@ struct thread_info *secondary_ti;
 cpumask_t cpu_possible_map = CPU_MASK_NONE;
 cpumask_t cpu_online_map = CPU_MASK_NONE;
 DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE;
+DEFINE_PER_CPU(cpumask_t, cpu_core_map) = CPU_MASK_NONE;
 
 EXPORT_SYMBOL(cpu_online_map);
 EXPORT_SYMBOL(cpu_possible_map);
 EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
+EXPORT_PER_CPU_SYMBOL(cpu_core_map);
 
 /* SMP operations for this machine */
 struct smp_ops_t *smp_ops;
@@ -228,6 +231,8 @@ void __devinit smp_prepare_boot_cpu(void)
         BUG_ON(smp_processor_id() != boot_cpuid);
 
         cpu_set(boot_cpuid, cpu_online_map);
+        cpu_set(boot_cpuid, per_cpu(cpu_sibling_map, boot_cpuid));
+        cpu_set(boot_cpuid, per_cpu(cpu_core_map, boot_cpuid));
 #ifdef CONFIG_PPC64
         paca[boot_cpuid].__current = current;
 #endif
@@ -375,11 +380,60 @@ int __cpuinit __cpu_up(unsigned int cpu)
         return 0;
 }
 
+/* Return the value of the reg property corresponding to the given
+ * logical cpu.
+ */
+int cpu_to_core_id(int cpu)
+{
+        struct device_node *np;
+        const int *reg;
+        int id = -1;
+
+        np = of_get_cpu_node(cpu, NULL);
+        if (!np)
+                goto out;
+
+        reg = of_get_property(np, "reg", NULL);
+        if (!reg)
+                goto out;
+
+        id = *reg;
+out:
+        of_node_put(np);
+        return id;
+}
+
+/* Must be called when no change can occur to cpu_present_map,
+ * i.e. during cpu online or offline.
+ */
+static struct device_node *cpu_to_l2cache(int cpu)
+{
+        struct device_node *np;
+        const phandle *php;
+        phandle ph;
+
+        if (!cpu_present(cpu))
+                return NULL;
+
+        np = of_get_cpu_node(cpu, NULL);
+        if (np == NULL)
+                return NULL;
+
+        php = of_get_property(np, "l2-cache", NULL);
+        if (php == NULL)
+                return NULL;
+        ph = *php;
+        of_node_put(np);
+
+        return of_find_node_by_phandle(ph);
+}
 
 /* Activate a secondary processor. */
 int __devinit start_secondary(void *unused)
 {
         unsigned int cpu = smp_processor_id();
+        struct device_node *l2_cache;
+        int i, base;
 
         atomic_inc(&init_mm.mm_count);
         current->active_mm = &init_mm;
@@ -400,6 +454,33 @@ int __devinit start_secondary(void *unused)
 
         ipi_call_lock();
         cpu_set(cpu, cpu_online_map);
+        /* Update sibling maps */
+        base = cpu_first_thread_in_core(cpu);
+        for (i = 0; i < threads_per_core; i++) {
+                if (cpu_is_offline(base + i))
+                        continue;
+                cpu_set(cpu, per_cpu(cpu_sibling_map, base + i));
+                cpu_set(base + i, per_cpu(cpu_sibling_map, cpu));
+
+                /* cpu_core_map should be a superset of
+                 * cpu_sibling_map even if we don't have cache
+                 * information, so update the former here, too.
+                 */
+                cpu_set(cpu, per_cpu(cpu_core_map, base +i));
+                cpu_set(base + i, per_cpu(cpu_core_map, cpu));
+        }
+        l2_cache = cpu_to_l2cache(cpu);
+        for_each_online_cpu(i) {
+                struct device_node *np = cpu_to_l2cache(i);
+                if (!np)
+                        continue;
+                if (np == l2_cache) {
+                        cpu_set(cpu, per_cpu(cpu_core_map, i));
+                        cpu_set(i, per_cpu(cpu_core_map, cpu));
+                }
+                of_node_put(np);
+        }
+        of_node_put(l2_cache);
         ipi_call_unlock();
 
         local_irq_enable();
@@ -437,10 +518,42 @@ void __init smp_cpus_done(unsigned int max_cpus)
 #ifdef CONFIG_HOTPLUG_CPU
 int __cpu_disable(void)
 {
-        if (smp_ops->cpu_disable)
-                return smp_ops->cpu_disable();
+        struct device_node *l2_cache;
+        int cpu = smp_processor_id();
+        int base, i;
+        int err;
 
-        return -ENOSYS;
+        if (!smp_ops->cpu_disable)
+                return -ENOSYS;
+
+        err = smp_ops->cpu_disable();
+        if (err)
+                return err;
+
+        /* Update sibling maps */
+        base = cpu_first_thread_in_core(cpu);
+        for (i = 0; i < threads_per_core; i++) {
+                cpu_clear(cpu, per_cpu(cpu_sibling_map, base + i));
+                cpu_clear(base + i, per_cpu(cpu_sibling_map, cpu));
+                cpu_clear(cpu, per_cpu(cpu_core_map, base +i));
+                cpu_clear(base + i, per_cpu(cpu_core_map, cpu));
+        }
+
+        l2_cache = cpu_to_l2cache(cpu);
+        for_each_present_cpu(i) {
+                struct device_node *np = cpu_to_l2cache(i);
+                if (!np)
+                        continue;
+                if (np == l2_cache) {
+                        cpu_clear(cpu, per_cpu(cpu_core_map, i));
+                        cpu_clear(i, per_cpu(cpu_core_map, cpu));
+                }
+                of_node_put(np);
+        }
+        of_node_put(l2_cache);
+
+
+        return 0;
 }
 
 void __cpu_die(unsigned int cpu)
diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c
index f2589645870a..b0dbb1daa4df 100644
--- a/arch/powerpc/kernel/stacktrace.c
+++ b/arch/powerpc/kernel/stacktrace.c
@@ -13,7 +13,6 @@
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/stacktrace.h>
-#include <linux/module.h>
 #include <asm/ptrace.h>
 #include <asm/processor.h>
 
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index 800e5e9a087b..56d172d16e56 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -22,6 +22,8 @@
 
 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 
+static DEFINE_PER_CPU(struct kobject *, cache_toplevel);
+
 /* SMT stuff */
 
 #ifdef CONFIG_PPC_MULTIPLATFORM
@@ -297,8 +299,289 @@ static struct sysdev_attribute pa6t_attrs[] = {
 #endif /* CONFIG_DEBUG_KERNEL */
 };
 
+struct cache_desc {
+        struct kobject kobj;
+        struct cache_desc *next;
+        const char *type;       /* Instruction, Data, or Unified */
+        u32 size;               /* total cache size in KB */
+        u32 line_size;          /* in bytes */
+        u32 nr_sets;            /* number of sets */
+        u32 level;              /* e.g. 1, 2, 3... */
+        u32 associativity;      /* e.g. 8-way... 0 is fully associative */
+};
+
+DEFINE_PER_CPU(struct cache_desc *, cache_desc);
+
+static struct cache_desc *kobj_to_cache_desc(struct kobject *k)
+{
+        return container_of(k, struct cache_desc, kobj);
+}
+
+static void cache_desc_release(struct kobject *k)
+{
+        struct cache_desc *desc = kobj_to_cache_desc(k);
+
+        pr_debug("%s: releasing %s\n", __func__, kobject_name(k));
+
+        if (desc->next)
+                kobject_put(&desc->next->kobj);
+
+        kfree(kobj_to_cache_desc(k));
+}
+
+static ssize_t cache_desc_show(struct kobject *k, struct attribute *attr, char *buf)
+{
+        struct kobj_attribute *kobj_attr;
+
+        kobj_attr = container_of(attr, struct kobj_attribute, attr);
+
+        return kobj_attr->show(k, kobj_attr, buf);
+}
+
+static struct sysfs_ops cache_desc_sysfs_ops = {
+        .show = cache_desc_show,
+};
+
+static struct kobj_type cache_desc_type = {
+        .release = cache_desc_release,
+        .sysfs_ops = &cache_desc_sysfs_ops,
+};
+
+static ssize_t cache_size_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
+{
+        struct cache_desc *cache = kobj_to_cache_desc(k);
+
+        return sprintf(buf, "%uK\n", cache->size);
+}
+
+static struct kobj_attribute cache_size_attr =
+        __ATTR(size, 0444, cache_size_show, NULL);
+
+static ssize_t cache_line_size_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
+{
+        struct cache_desc *cache = kobj_to_cache_desc(k);
+
+        return sprintf(buf, "%u\n", cache->line_size);
+}
+
+static struct kobj_attribute cache_line_size_attr =
+        __ATTR(coherency_line_size, 0444, cache_line_size_show, NULL);
+
+static ssize_t cache_nr_sets_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
+{
+        struct cache_desc *cache = kobj_to_cache_desc(k);
+
+        return sprintf(buf, "%u\n", cache->nr_sets);
+}
+
+static struct kobj_attribute cache_nr_sets_attr =
+        __ATTR(number_of_sets, 0444, cache_nr_sets_show, NULL);
+
+static ssize_t cache_type_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
+{
+        struct cache_desc *cache = kobj_to_cache_desc(k);
+
+        return sprintf(buf, "%s\n", cache->type);
+}
+
+static struct kobj_attribute cache_type_attr =
+        __ATTR(type, 0444, cache_type_show, NULL);
+
+static ssize_t cache_level_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
+{
+        struct cache_desc *cache = kobj_to_cache_desc(k);
+
+        return sprintf(buf, "%u\n", cache->level);
+}
+
+static struct kobj_attribute cache_level_attr =
+        __ATTR(level, 0444, cache_level_show, NULL);
+
+static ssize_t cache_assoc_show(struct kobject *k, struct kobj_attribute *attr, char *buf)
+{
+        struct cache_desc *cache = kobj_to_cache_desc(k);
+
+        return sprintf(buf, "%u\n", cache->associativity);
+}
+
+static struct kobj_attribute cache_assoc_attr =
+        __ATTR(ways_of_associativity, 0444, cache_assoc_show, NULL);
+
+struct cache_desc_info {
+        const char *type;
+        const char *size_prop;
+        const char *line_size_prop;
+        const char *nr_sets_prop;
+};
+
+/* PowerPC Processor binding says the [di]-cache-* must be equal on
+ * unified caches, so just use d-cache properties. */
+static struct cache_desc_info ucache_info = {
+        .type = "Unified",
+        .size_prop = "d-cache-size",
+        .line_size_prop = "d-cache-line-size",
+        .nr_sets_prop = "d-cache-sets",
+};
 
-static void register_cpu_online(unsigned int cpu)
+static struct cache_desc_info dcache_info = {
+        .type = "Data",
+        .size_prop = "d-cache-size",
+        .line_size_prop = "d-cache-line-size",
+        .nr_sets_prop = "d-cache-sets",
+};
+
+static struct cache_desc_info icache_info = {
+        .type = "Instruction",
+        .size_prop = "i-cache-size",
+        .line_size_prop = "i-cache-line-size",
+        .nr_sets_prop = "i-cache-sets",
+};
+
+static struct cache_desc * __cpuinit create_cache_desc(struct device_node *np, struct kobject *parent, int index, int level, struct cache_desc_info *info)
+{
+        const u32 *cache_line_size;
+        struct cache_desc *new;
+        const u32 *cache_size;
+        const u32 *nr_sets;
+        int rc;
+
+        new = kzalloc(sizeof(*new), GFP_KERNEL);
+        if (!new)
+                return NULL;
+
+        rc = kobject_init_and_add(&new->kobj, &cache_desc_type, parent,
+                                  "index%d", index);
+        if (rc)
+                goto err;
+
+        /* type */
+        new->type = info->type;
+        rc = sysfs_create_file(&new->kobj, &cache_type_attr.attr);
+        WARN_ON(rc);
+
+        /* level */
+        new->level = level;
+        rc = sysfs_create_file(&new->kobj, &cache_level_attr.attr);
+        WARN_ON(rc);
+
+        /* size */
+        cache_size = of_get_property(np, info->size_prop, NULL);
+        if (cache_size) {
+                new->size = *cache_size / 1024;
+                rc = sysfs_create_file(&new->kobj,
+                                       &cache_size_attr.attr);
+                WARN_ON(rc);
+        }
+
+        /* coherency_line_size */
+        cache_line_size = of_get_property(np, info->line_size_prop, NULL);
+        if (cache_line_size) {
+                new->line_size = *cache_line_size;
+                rc = sysfs_create_file(&new->kobj,
+                                       &cache_line_size_attr.attr);
+                WARN_ON(rc);
+        }
+
+        /* number_of_sets */
+        nr_sets = of_get_property(np, info->nr_sets_prop, NULL);
+        if (nr_sets) {
+                new->nr_sets = *nr_sets;
+                rc = sysfs_create_file(&new->kobj,
+                                       &cache_nr_sets_attr.attr);
+                WARN_ON(rc);
+        }
+
+        /* ways_of_associativity */
+        if (new->nr_sets == 1) {
+                /* fully associative */
+                new->associativity = 0;
+                goto create_assoc;
+        }
+
+        if (new->nr_sets && new->size && new->line_size) {
+                /* If we have values for all of these we can derive
+                 * the associativity. */
+                new->associativity =
+                        ((new->size * 1024) / new->nr_sets) / new->line_size;
+create_assoc:
+                rc = sysfs_create_file(&new->kobj,
+                                       &cache_assoc_attr.attr);
+                WARN_ON(rc);
+        }
+
+        return new;
+err:
+        kfree(new);
+        return NULL;
+}
+
+static bool cache_is_unified(struct device_node *np)
+{
+        return of_get_property(np, "cache-unified", NULL);
+}
+
+static struct cache_desc * __cpuinit create_cache_index_info(struct device_node *np, struct kobject *parent, int index, int level)
+{
+        const phandle *next_cache_phandle;
+        struct device_node *next_cache;
+        struct cache_desc *new, **end;
+
+        pr_debug("%s(node = %s, index = %d)\n", __func__, np->full_name, index);
+
+        if (cache_is_unified(np)) {
+                new = create_cache_desc(np, parent, index, level,
+                                        &ucache_info);
+        } else {
+                new = create_cache_desc(np, parent, index, level,
+                                        &dcache_info);
+                if (new) {
+                        index++;
+                        new->next = create_cache_desc(np, parent, index, level,
+                                                      &icache_info);
+                }
+        }
+        if (!new)
+                return NULL;
+
+        end = &new->next;
+        while (*end)
+                end = &(*end)->next;
+
+        next_cache_phandle = of_get_property(np, "l2-cache", NULL);
+        if (!next_cache_phandle)
+                goto out;
+
+        next_cache = of_find_node_by_phandle(*next_cache_phandle);
+        if (!next_cache)
+                goto out;
+
+        *end = create_cache_index_info(next_cache, parent, ++index, ++level);
+
+        of_node_put(next_cache);
+out:
+        return new;
+}
+
+static void __cpuinit create_cache_info(struct sys_device *sysdev)
+{
+        struct kobject *cache_toplevel;
+        struct device_node *np = NULL;
+        int cpu = sysdev->id;
+
+        cache_toplevel = kobject_create_and_add("cache", &sysdev->kobj);
+        if (!cache_toplevel)
+                return;
+        per_cpu(cache_toplevel, cpu) = cache_toplevel;
+        np = of_get_cpu_node(cpu, NULL);
+        if (np != NULL) {
+                per_cpu(cache_desc, cpu) =
+                        create_cache_index_info(np, cache_toplevel, 0, 1);
+                of_node_put(np);
+        }
+        return;
+}
+
+static void __cpuinit register_cpu_online(unsigned int cpu)
 {
         struct cpu *c = &per_cpu(cpu_devices, cpu);
         struct sys_device *s = &c->sysdev;
@@ -346,9 +629,33 @@ static void register_cpu_online(unsigned int cpu)
 
         if (cpu_has_feature(CPU_FTR_DSCR))
                 sysdev_create_file(s, &attr_dscr);
+
+        create_cache_info(s);
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
+static void remove_cache_info(struct sys_device *sysdev)
+{
+        struct kobject *cache_toplevel;
+        struct cache_desc *cache_desc;
+        int cpu = sysdev->id;
+
+        cache_desc = per_cpu(cache_desc, cpu);
+        if (cache_desc != NULL) {
+                sysfs_remove_file(&cache_desc->kobj, &cache_size_attr.attr);
+                sysfs_remove_file(&cache_desc->kobj, &cache_line_size_attr.attr);
+                sysfs_remove_file(&cache_desc->kobj, &cache_type_attr.attr);
+                sysfs_remove_file(&cache_desc->kobj, &cache_level_attr.attr);
+                sysfs_remove_file(&cache_desc->kobj, &cache_nr_sets_attr.attr);
+                sysfs_remove_file(&cache_desc->kobj, &cache_assoc_attr.attr);
+
+                kobject_put(&cache_desc->kobj);
+        }
+        cache_toplevel = per_cpu(cache_toplevel, cpu);
+        if (cache_toplevel != NULL)
+                kobject_put(cache_toplevel);
+}
+
 static void unregister_cpu_online(unsigned int cpu)
 {
         struct cpu *c = &per_cpu(cpu_devices, cpu);
@@ -399,6 +706,8 @@ static void unregister_cpu_online(unsigned int cpu)
 
         if (cpu_has_feature(CPU_FTR_DSCR))
                 sysdev_remove_file(s, &attr_dscr);
+
+        remove_cache_info(s);
 }
 #endif /* CONFIG_HOTPLUG_CPU */
 
diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index ade8aeaa2e70..22a3c33fd751 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -530,7 +530,7 @@ static dma_addr_t vio_dma_iommu_map_single(struct device *dev, void *vaddr,
         }
 
         ret = dma_iommu_ops.map_single(dev, vaddr, size, direction, attrs);
-        if (unlikely(dma_mapping_error(ret))) {
+        if (unlikely(dma_mapping_error(dev, ret))) {
                 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE));
                 atomic_inc(&viodev->cmo.allocs_failed);
         }
@@ -1031,8 +1031,8 @@ void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired) {}
 static int vio_cmo_bus_probe(struct vio_dev *viodev) { return 0; }
 static void vio_cmo_bus_remove(struct vio_dev *viodev) {}
 static void vio_cmo_set_dma_ops(struct vio_dev *viodev) {}
-static void vio_cmo_bus_init() {}
-static void vio_cmo_sysfs_init() { }
+static void vio_cmo_bus_init(void) {}
+static void vio_cmo_sysfs_init(void) { }
 #endif /* CONFIG_PPC_SMLPAR */
 EXPORT_SYMBOL(vio_cmo_entitlement_update);
 EXPORT_SYMBOL(vio_cmo_set_dev_desired);