Merge branch 'devel-stable' into for-linus

Documentation/devicetree/bindings/arm/cpus.txt

+* ARM CPUs binding description
+
+The device tree allows to describe the layout of CPUs in a system through
+the "cpus" node, which in turn contains a number of subnodes (ie "cpu")
+defining properties for every cpu.
+
+Bindings for CPU nodes follow the ePAPR standard, available from:
+
+http://devicetree.org
+
+For the ARM architecture every CPU node must contain the following properties:
+
+- device_type:	must be "cpu"
+- reg:		property matching the CPU MPIDR[23:0] register bits
+		reg[31:24] bits must be set to 0
+- compatible:	should be one of:
+		"arm,arm1020"
+		"arm,arm1020e"
+		"arm,arm1022"
+		"arm,arm1026"
+		"arm,arm720"
+		"arm,arm740"
+		"arm,arm7tdmi"
+		"arm,arm920"
+		"arm,arm922"
+		"arm,arm925"
+		"arm,arm926"
+		"arm,arm940"
+		"arm,arm946"
+		"arm,arm9tdmi"
+		"arm,cortex-a5"
+		"arm,cortex-a7"
+		"arm,cortex-a8"
+		"arm,cortex-a9"
+		"arm,cortex-a15"
+		"arm,arm1136"
+		"arm,arm1156"
+		"arm,arm1176"
+		"arm,arm11mpcore"
+		"faraday,fa526"
+		"intel,sa110"
+		"intel,sa1100"
+		"marvell,feroceon"
+		"marvell,mohawk"
+		"marvell,xsc3"
+		"marvell,xscale"
+
+Example:
+
+	cpus {
+		#size-cells = <0>;
+		#address-cells = <1>;
+
+		CPU0: cpu@0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a15";
+			reg = <0x0>;
+		};
+
+		CPU1: cpu@1 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a15";
+			reg = <0x1>;
+		};
+
+		CPU2: cpu@100 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a7";
+			reg = <0x100>;
+		};
+
+		CPU3: cpu@101 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a7";
+			reg = <0x101>;
+		};
+	};

arch/arm/common/gic.c

@@ -69,6 +69,14 @@ struct gic_chip_data {
 
 static DEFINE_RAW_SPINLOCK(irq_controller_lock);
 
+/*
+ * The GIC mapping of CPU interfaces does not necessarily match
+ * the logical CPU numbering.  Let's use a mapping as returned
+ * by the GIC itself.
+ */
+#define NR_GIC_CPU_IF 8
+static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly;
+
 /*
  * Supported arch specific GIC irq extension.
  * Default make them NULL.
@@ -238,11 +246,11 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
 	unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask);
 	u32 val, mask, bit;
 
-	if (cpu >= 8 || cpu >= nr_cpu_ids)
+	if (cpu >= NR_GIC_CPU_IF || cpu >= nr_cpu_ids)
 		return -EINVAL;
 
 	mask = 0xff << shift;
-	bit = 1 << (cpu_logical_map(cpu) + shift);
+	bit = gic_cpu_map[cpu] << shift;
 
 	raw_spin_lock(&irq_controller_lock);
 	val = readl_relaxed(reg) & ~mask;
@@ -349,11 +357,6 @@ static void __init gic_dist_init(struct gic_chip_data *gic)
 	u32 cpumask;
 	unsigned int gic_irqs = gic->gic_irqs;
 	void __iomem *base = gic_data_dist_base(gic);
-	u32 cpu = cpu_logical_map(smp_processor_id());
-
-	cpumask = 1 << cpu;
-	cpumask |= cpumask << 8;
-	cpumask |= cpumask << 16;
 
 	writel_relaxed(0, base + GIC_DIST_CTRL);
 
@@ -366,6 +369,7 @@ static void __init gic_dist_init(struct gic_chip_data *gic)
 	/*
 	 * Set all global interrupts to this CPU only.
 	 */
+	cpumask = readl_relaxed(base + GIC_DIST_TARGET + 0);
 	for (i = 32; i < gic_irqs; i += 4)
 		writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4);
 
@@ -389,8 +393,24 @@ static void __cpuinit gic_cpu_init(struct gic_chip_data *gic)
 {
 	void __iomem *dist_base = gic_data_dist_base(gic);
 	void __iomem *base = gic_data_cpu_base(gic);
+	unsigned int cpu_mask, cpu = smp_processor_id();
 	int i;
 
+	/*
+	 * Get what the GIC says our CPU mask is.
+	 */
+	BUG_ON(cpu >= NR_GIC_CPU_IF);
+	cpu_mask = readl_relaxed(dist_base + GIC_DIST_TARGET + 0);
+	gic_cpu_map[cpu] = cpu_mask;
+
+	/*
+	 * Clear our mask from the other map entries in case they're
+	 * still undefined.
+	 */
+	for (i = 0; i < NR_GIC_CPU_IF; i++)
+		if (i != cpu)
+			gic_cpu_map[i] &= ~cpu_mask;
+
 	/*
 	 * Deal with the banked PPI and SGI interrupts - disable all
 	 * PPI interrupts, ensure all SGI interrupts are enabled.
@@ -646,7 +666,7 @@ void __init gic_init_bases(unsigned int gic_nr, int irq_start,
 {
 	irq_hw_number_t hwirq_base;
 	struct gic_chip_data *gic;
-	int gic_irqs, irq_base;
+	int gic_irqs, irq_base, i;
 
 	BUG_ON(gic_nr >= MAX_GIC_NR);
 
@@ -682,6 +702,13 @@ void __init gic_init_bases(unsigned int gic_nr, int irq_start,
 		gic_set_base_accessor(gic, gic_get_common_base);
 	}
 
+	/*
+	 * Initialize the CPU interface map to all CPUs.
+	 * It will be refined as each CPU probes its ID.
+	 */
+	for (i = 0; i < NR_GIC_CPU_IF; i++)
+		gic_cpu_map[i] = 0xff;
+
 	/*
 	 * For primary GICs, skip over SGIs.
 	 * For secondary GICs, skip over PPIs, too.
@@ -737,7 +764,7 @@ void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
 
 	/* Convert our logical CPU mask into a physical one. */
 	for_each_cpu(cpu, mask)
-		map |= 1 << cpu_logical_map(cpu);
+		map |= gic_cpu_map[cpu];
 
 	/*
 	 * Ensure that stores to Normal memory are visible to the

arch/arm/include/asm/Kbuild

@@ -16,7 +16,6 @@ generic-y += local64.h
 generic-y += msgbuf.h
 generic-y += param.h
 generic-y += parport.h
-generic-y += percpu.h
 generic-y += poll.h
 generic-y += resource.h
 generic-y += sections.h

arch/arm/include/asm/cpu.h

@@ -15,6 +15,7 @@
 
 struct cpuinfo_arm {
 	struct cpu	cpu;
+	u32		cpuid;
 #ifdef CONFIG_SMP
 	unsigned int	loops_per_jiffy;
 #endif

arch/arm/include/asm/cputype.h

@@ -25,6 +25,19 @@
 #define CPUID_EXT_ISAR4	"c2, 4"
 #define CPUID_EXT_ISAR5	"c2, 5"
 
+#define MPIDR_SMP_BITMASK (0x3 << 30)
+#define MPIDR_SMP_VALUE (0x2 << 30)
+
+#define MPIDR_MT_BITMASK (0x1 << 24)
+
+#define MPIDR_HWID_BITMASK 0xFFFFFF
+
+#define MPIDR_LEVEL_BITS 8
+#define MPIDR_LEVEL_MASK ((1 << MPIDR_LEVEL_BITS) - 1)
+
+#define MPIDR_AFFINITY_LEVEL(mpidr, level) \
+	((mpidr >> (MPIDR_LEVEL_BITS * level)) & MPIDR_LEVEL_MASK)
+
 extern unsigned int processor_id;
 
 #ifdef CONFIG_CPU_CP15

arch/arm/include/asm/cti.h

@@ -146,15 +146,7 @@ static inline void cti_irq_ack(struct cti *cti)
  */
 static inline void cti_unlock(struct cti *cti)
 {
-	void __iomem *base = cti->base;
-	unsigned long val;
-
-	val = __raw_readl(base + LOCKSTATUS);
-
-	if (val & 1) {
-		val = LOCKCODE;
-		__raw_writel(val, base + LOCKACCESS);
-	}
+	__raw_writel(LOCKCODE, cti->base + LOCKACCESS);
 }
 
 /**
@@ -166,14 +158,6 @@ static inline void cti_unlock(struct cti *cti)
  */
 static inline void cti_lock(struct cti *cti)
 {
-	void __iomem *base = cti->base;
-	unsigned long val;
-
-	val = __raw_readl(base + LOCKSTATUS);
-
-	if (!(val & 1)) {
-		val = ~LOCKCODE;
-		__raw_writel(val, base + LOCKACCESS);
-	}
+	__raw_writel(~LOCKCODE, cti->base + LOCKACCESS);
 }
 #endif

arch/arm/include/asm/hw_breakpoint.h

@@ -98,12 +98,12 @@ static inline void decode_ctrl_reg(u32 reg,
 #define ARM_BASE_WCR		112
 
 /* Accessor macros for the debug registers. */
-#define ARM_DBG_READ(M, OP2, VAL) do {\
-	asm volatile("mrc p14, 0, %0, c0," #M ", " #OP2 : "=r" (VAL));\
+#define ARM_DBG_READ(N, M, OP2, VAL) do {\
+	asm volatile("mrc p14, 0, %0, " #N "," #M ", " #OP2 : "=r" (VAL));\
 } while (0)
 
-#define ARM_DBG_WRITE(M, OP2, VAL) do {\
-	asm volatile("mcr p14, 0, %0, c0," #M ", " #OP2 : : "r" (VAL));\
+#define ARM_DBG_WRITE(N, M, OP2, VAL) do {\
+	asm volatile("mcr p14, 0, %0, " #N "," #M ", " #OP2 : : "r" (VAL));\
 } while (0)
 
 struct notifier_block;

arch/arm/include/asm/mmu.h

@@ -5,18 +5,15 @@
 
 typedef struct {
 #ifdef CONFIG_CPU_HAS_ASID
-	unsigned int id;
-	raw_spinlock_t id_lock;
+	u64 id;
 #endif
-	unsigned int kvm_seq;
+	unsigned int vmalloc_seq;
 } mm_context_t;
 
 #ifdef CONFIG_CPU_HAS_ASID
-#define ASID(mm)	((mm)->context.id & 255)
-
-/* init_mm.context.id_lock should be initialized. */
-#define INIT_MM_CONTEXT(name)                                                 \
-	.context.id_lock    = __RAW_SPIN_LOCK_UNLOCKED(name.context.id_lock),
+#define ASID_BITS	8
+#define ASID_MASK	((~0ULL) << ASID_BITS)
+#define ASID(mm)	((mm)->context.id & ~ASID_MASK)
 #else
 #define ASID(mm)	(0)
 #endif

arch/arm/include/asm/mmu_context.h

@@ -20,88 +20,12 @@
 #include <asm/proc-fns.h>
 #include <asm-generic/mm_hooks.h>
 
-void __check_kvm_seq(struct mm_struct *mm);
+void __check_vmalloc_seq(struct mm_struct *mm);
 
 #ifdef CONFIG_CPU_HAS_ASID
 
-/*
- * On ARMv6, we have the following structure in the Context ID:
- *
- * 31                         7          0
- * +-------------------------+-----------+
- * |      process ID         |   ASID    |
- * +-------------------------+-----------+
- * |              context ID             |
- * +-------------------------------------+
- *
- * The ASID is used to tag entries in the CPU caches and TLBs.
- * The context ID is used by debuggers and trace logic, and
- * should be unique within all running processes.
- */
-#define ASID_BITS		8
-#define ASID_MASK		((~0) << ASID_BITS)
-#define ASID_FIRST_VERSION	(1 << ASID_BITS)
-
-extern unsigned int cpu_last_asid;
-
-void __init_new_context(struct task_struct *tsk, struct mm_struct *mm);
-void __new_context(struct mm_struct *mm);
-void cpu_set_reserved_ttbr0(void);
-
-static inline void switch_new_context(struct mm_struct *mm)
-{
-	unsigned long flags;
-
-	__new_context(mm);
-
-	local_irq_save(flags);
-	cpu_switch_mm(mm->pgd, mm);
-	local_irq_restore(flags);
-}
-
-static inline void check_and_switch_context(struct mm_struct *mm,
-					    struct task_struct *tsk)
-{
-	if (unlikely(mm->context.kvm_seq != init_mm.context.kvm_seq))
-		__check_kvm_seq(mm);
-
-	/*
-	 * Required during context switch to avoid speculative page table
-	 * walking with the wrong TTBR.
-	 */
-	cpu_set_reserved_ttbr0();
-
-	if (!((mm->context.id ^ cpu_last_asid) >> ASID_BITS))
-		/*
-		 * The ASID is from the current generation, just switch to the
-		 * new pgd. This condition is only true for calls from
-		 * context_switch() and interrupts are already disabled.
-		 */
-		cpu_switch_mm(mm->pgd, mm);
-	else if (irqs_disabled())
-		/*
-		 * Defer the new ASID allocation until after the context
-		 * switch critical region since __new_context() cannot be
-		 * called with interrupts disabled (it sends IPIs).
-		 */
-		set_ti_thread_flag(task_thread_info(tsk), TIF_SWITCH_MM);
-	else
-		/*
-		 * That is a direct call to switch_mm() or activate_mm() with
-		 * interrupts enabled and a new context.
-		 */
-		switch_new_context(mm);
-}
-
-#define init_new_context(tsk,mm)	(__init_new_context(tsk,mm),0)
-
-#define finish_arch_post_lock_switch \
-	finish_arch_post_lock_switch
-static inline void finish_arch_post_lock_switch(void)
-{
-	if (test_and_clear_thread_flag(TIF_SWITCH_MM))
-		switch_new_context(current->mm);
-}
+void check_and_switch_context(struct mm_struct *mm, struct task_struct *tsk);
+#define init_new_context(tsk,mm)	({ mm->context.id = 0; })
 
 #else	/* !CONFIG_CPU_HAS_ASID */
 
@@ -110,8 +34,8 @@ static inline void finish_arch_post_lock_switch(void)
 static inline void check_and_switch_context(struct mm_struct *mm,
 					    struct task_struct *tsk)
 {
-	if (unlikely(mm->context.kvm_seq != init_mm.context.kvm_seq))
-		__check_kvm_seq(mm);
+	if (unlikely(mm->context.vmalloc_seq != init_mm.context.vmalloc_seq))
+		__check_vmalloc_seq(mm);
 
 	if (irqs_disabled())
 		/*
@@ -143,6 +67,7 @@ static inline void finish_arch_post_lock_switch(void)
 #endif	/* CONFIG_CPU_HAS_ASID */
 
 #define destroy_context(mm)		do { } while(0)
+#define activate_mm(prev,next)		switch_mm(prev, next, NULL)
 
 /*
  * This is called when "tsk" is about to enter lazy TLB mode.
@@ -186,6 +111,5 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
 }
 
 #define deactivate_mm(tsk,mm)	do { } while (0)
-#define activate_mm(prev,next)	switch_mm(prev, next, NULL)
 
 #endif

arch/arm/include/asm/percpu.h

+/*
+ * Copyright 2012 Calxeda, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _ASM_ARM_PERCPU_H_
+#define _ASM_ARM_PERCPU_H_
+
+/*
+ * Same as asm-generic/percpu.h, except that we store the per cpu offset
+ * in the TPIDRPRW. TPIDRPRW only exists on V6K and V7
+ */
+#if defined(CONFIG_SMP) && !defined(CONFIG_CPU_V6)
+static inline void set_my_cpu_offset(unsigned long off)
+{
+	/* Set TPIDRPRW */
+	asm volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (off) : "memory");
+}
+
+static inline unsigned long __my_cpu_offset(void)
+{
+	unsigned long off;
+	/* Read TPIDRPRW */
+	asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off) : : "memory");
+	return off;
+}
+#define __my_cpu_offset __my_cpu_offset()
+#else
+#define set_my_cpu_offset(x)	do {} while(0)
+
+#endif /* CONFIG_SMP */
+
+#include <asm-generic/percpu.h>
+
+#endif /* _ASM_ARM_PERCPU_H_ */

arch/arm/include/asm/perf_event.h

@@ -21,4 +21,11 @@
 #define C(_x)				PERF_COUNT_HW_CACHE_##_x
 #define CACHE_OP_UNSUPPORTED		0xFFFF
 
+#ifdef CONFIG_HW_PERF_EVENTS
+struct pt_regs;
+extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
+extern unsigned long perf_misc_flags(struct pt_regs *regs);
+#define perf_misc_flags(regs)	perf_misc_flags(regs)
+#endif
+
 #endif /* __ARM_PERF_EVENT_H__ */

arch/arm/include/asm/pgtable-2level.h

@@ -115,6 +115,7 @@
  * The PTE table pointer refers to the hardware entries; the "Linux"
  * entries are stored 1024 bytes below.
  */
+#define L_PTE_VALID		(_AT(pteval_t, 1) << 0)		/* Valid */
 #define L_PTE_PRESENT		(_AT(pteval_t, 1) << 0)
 #define L_PTE_YOUNG		(_AT(pteval_t, 1) << 1)
 #define L_PTE_FILE		(_AT(pteval_t, 1) << 2)	/* only when !PRESENT */
@@ -123,6 +124,7 @@
 #define L_PTE_USER		(_AT(pteval_t, 1) << 8)
 #define L_PTE_XN		(_AT(pteval_t, 1) << 9)
 #define L_PTE_SHARED		(_AT(pteval_t, 1) << 10)	/* shared(v6), coherent(xsc3) */
+#define L_PTE_NONE		(_AT(pteval_t, 1) << 11)
 
 /*
  * These are the memory types, defined to be compatible with

arch/arm/include/asm/pgtable-3level.h

@@ -67,7 +67,8 @@
  * These bits overlap with the hardware bits but the naming is preserved for
  * consistency with the classic page table format.
  */
-#define L_PTE_PRESENT		(_AT(pteval_t, 3) << 0)		/* Valid */
+#define L_PTE_VALID		(_AT(pteval_t, 1) << 0)		/* Valid */
+#define L_PTE_PRESENT		(_AT(pteval_t, 3) << 0)		/* Present */
 #define L_PTE_FILE		(_AT(pteval_t, 1) << 2)		/* only when !PRESENT */
 #define L_PTE_USER		(_AT(pteval_t, 1) << 6)		/* AP[1] */
 #define L_PTE_RDONLY		(_AT(pteval_t, 1) << 7)		/* AP[2] */
@@ -76,6 +77,7 @@
 #define L_PTE_XN		(_AT(pteval_t, 1) << 54)	/* XN */
 #define L_PTE_DIRTY		(_AT(pteval_t, 1) << 55)	/* unused */
 #define L_PTE_SPECIAL		(_AT(pteval_t, 1) << 56)	/* unused */
+#define L_PTE_NONE		(_AT(pteval_t, 1) << 57)	/* PROT_NONE */
 
 /*
  * To be used in assembly code with the upper page attributes.

arch/arm/include/asm/pgtable.h

@@ -73,7 +73,7 @@ extern pgprot_t		pgprot_kernel;
 
 #define _MOD_PROT(p, b)	__pgprot(pgprot_val(p) | (b))
 
-#define PAGE_NONE		_MOD_PROT(pgprot_user, L_PTE_XN | L_PTE_RDONLY)
+#define PAGE_NONE		_MOD_PROT(pgprot_user, L_PTE_XN | L_PTE_RDONLY | L_PTE_NONE)
 #define PAGE_SHARED		_MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_XN)
 #define PAGE_SHARED_EXEC	_MOD_PROT(pgprot_user, L_PTE_USER)
 #define PAGE_COPY		_MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
@@ -83,7 +83,7 @@ extern pgprot_t		pgprot_kernel;
 #define PAGE_KERNEL		_MOD_PROT(pgprot_kernel, L_PTE_XN)
 #define PAGE_KERNEL_EXEC	pgprot_kernel
 
-#define __PAGE_NONE		__pgprot(_L_PTE_DEFAULT | L_PTE_RDONLY | L_PTE_XN)
+#define __PAGE_NONE		__pgprot(_L_PTE_DEFAULT | L_PTE_RDONLY | L_PTE_XN | L_PTE_NONE)
 #define __PAGE_SHARED		__pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_XN)
 #define __PAGE_SHARED_EXEC	__pgprot(_L_PTE_DEFAULT | L_PTE_USER)
 #define __PAGE_COPY		__pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN)
@@ -203,9 +203,7 @@ static inline pte_t *pmd_page_vaddr(pmd_t pmd)
 #define pte_exec(pte)		(!(pte_val(pte) & L_PTE_XN))
 #define pte_special(pte)	(0)
 
-#define pte_present_user(pte) \
-	((pte_val(pte) & (L_PTE_PRESENT | L_PTE_USER)) == \
-	 (L_PTE_PRESENT | L_PTE_USER))
+#define pte_present_user(pte)  (pte_present(pte) && (pte_val(pte) & L_PTE_USER))
 
 #if __LINUX_ARM_ARCH__ < 6
 static inline void __sync_icache_dcache(pte_t pteval)
@@ -242,7 +240,7 @@ static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
 
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
-	const pteval_t mask = L_PTE_XN | L_PTE_RDONLY | L_PTE_USER;
+	const pteval_t mask = L_PTE_XN | L_PTE_RDONLY | L_PTE_USER | L_PTE_NONE;
 	pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
 	return pte;
 }

arch/arm/include/asm/pmu.h

@@ -67,19 +67,19 @@ struct arm_pmu {
 	cpumask_t	active_irqs;
 	char		*name;
 	irqreturn_t	(*handle_irq)(int irq_num, void *dev);
-	void		(*enable)(struct hw_perf_event *evt, int idx);
-	void		(*disable)(struct hw_perf_event *evt, int idx);
+	void		(*enable)(struct perf_event *event);
+	void		(*disable)(struct perf_event *event);
 	int		(*get_event_idx)(struct pmu_hw_events *hw_events,
-					 struct hw_perf_event *hwc);
+					 struct perf_event *event);
 	int		(*set_event_filter)(struct hw_perf_event *evt,
 					    struct perf_event_attr *attr);
-	u32		(*read_counter)(int idx);
-	void		(*write_counter)(int idx, u32 val);
-	void		(*start)(void);
-	void		(*stop)(void);
+	u32		(*read_counter)(struct perf_event *event);
+	void		(*write_counter)(struct perf_event *event, u32 val);
+	void		(*start)(struct arm_pmu *);
+	void		(*stop)(struct arm_pmu *);
 	void		(*reset)(void *);
-	int		(*request_irq)(irq_handler_t handler);
-	void		(*free_irq)(void);
+	int		(*request_irq)(struct arm_pmu *, irq_handler_t handler);
+	void		(*free_irq)(struct arm_pmu *);
 	int		(*map_event)(struct perf_event *event);
 	int		num_events;
 	atomic_t	active_events;
@@ -93,15 +93,11 @@ struct arm_pmu {
 
 extern const struct dev_pm_ops armpmu_dev_pm_ops;
 
-int armpmu_register(struct arm_pmu *armpmu, char *name, int type);
+int armpmu_register(struct arm_pmu *armpmu, int type);
 
-u64 armpmu_event_update(struct perf_event *event,
-			struct hw_perf_event *hwc,
-			int idx);
+u64 armpmu_event_update(struct perf_event *event);
 
-int armpmu_event_set_period(struct perf_event *event,
-			    struct hw_perf_event *hwc,
-			    int idx);
+int armpmu_event_set_period(struct perf_event *event);
 
 int armpmu_map_event(struct perf_event *event,
 		     const unsigned (*event_map)[PERF_COUNT_HW_MAX],

arch/arm/include/asm/prom.h

@@ -15,6 +15,7 @@
 
 extern struct machine_desc *setup_machine_fdt(unsigned int dt_phys);
 extern void arm_dt_memblock_reserve(void);
+extern void __init arm_dt_init_cpu_maps(void);
 
 #else /* CONFIG_OF */
 
@@ -24,6 +25,7 @@ static inline struct machine_desc *setup_machine_fdt(unsigned int dt_phys)
 }
 
 static inline void arm_dt_memblock_reserve(void) { }
+static inline void arm_dt_init_cpu_maps(void) { }
 
 #endif /* CONFIG_OF */
 #endif /* ASMARM_PROM_H */

arch/arm/include/asm/smp_plat.h

@@ -5,6 +5,9 @@
 #ifndef __ASMARM_SMP_PLAT_H
 #define __ASMARM_SMP_PLAT_H
 
+#include <linux/cpumask.h>
+#include <linux/err.h>
+
 #include <asm/cputype.h>
 
 /*
@@ -48,5 +51,19 @@ static inline int cache_ops_need_broadcast(void)
  */
 extern int __cpu_logical_map[];
 #define cpu_logical_map(cpu)	__cpu_logical_map[cpu]
+/*
+ * Retrieve logical cpu index corresponding to a given MPIDR[23:0]
+ *  - mpidr: MPIDR[23:0] to be used for the look-up
+ *
+ * Returns the cpu logical index or -EINVAL on look-up error
+ */
+static inline int get_logical_index(u32 mpidr)
+{
+	int cpu;
+	for (cpu = 0; cpu < nr_cpu_ids; cpu++)
+		if (cpu_logical_map(cpu) == mpidr)
+			return cpu;
+	return -EINVAL;
+}
 
 #endif

arch/arm/kernel/devtree.c

@@ -19,8 +19,10 @@
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 
+#include <asm/cputype.h>
 #include <asm/setup.h>
 #include <asm/page.h>
+#include <asm/smp_plat.h>
 #include <asm/mach/arch.h>
 #include <asm/mach-types.h>
 
@@ -61,6 +63,108 @@ void __init arm_dt_memblock_reserve(void)
 	}
 }
 
+/*
+ * arm_dt_init_cpu_maps - Function retrieves cpu nodes from the device tree
+ * and builds the cpu logical map array containing MPIDR values related to
+ * logical cpus
+ *
+ * Updates the cpu possible mask with the number of parsed cpu nodes
+ */
+void __init arm_dt_init_cpu_maps(void)
+{
+	/*
+	 * Temp logical map is initialized with UINT_MAX values that are
+	 * considered invalid logical map entries since the logical map must
+	 * contain a list of MPIDR[23:0] values where MPIDR[31:24] must
+	 * read as 0.
+	 */
+	struct device_node *cpu, *cpus;
+	u32 i, j, cpuidx = 1;
+	u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0;
+
+	u32 tmp_map[NR_CPUS] = { [0 ... NR_CPUS-1] = UINT_MAX };
+	bool bootcpu_valid = false;
+	cpus = of_find_node_by_path("/cpus");
+
+	if (!cpus)
+		return;
+
+	for_each_child_of_node(cpus, cpu) {
+		u32 hwid;
+
+		pr_debug(" * %s...\n", cpu->full_name);
+		/*
+		 * A device tree containing CPU nodes with missing "reg"
+		 * properties is considered invalid to build the
+		 * cpu_logical_map.
+		 */
+		if (of_property_read_u32(cpu, "reg", &hwid)) {
+			pr_debug(" * %s missing reg property\n",
+				     cpu->full_name);
+			return;
+		}
+
+		/*
+		 * 8 MSBs must be set to 0 in the DT since the reg property
+		 * defines the MPIDR[23:0].
+		 */
+		if (hwid & ~MPIDR_HWID_BITMASK)
+			return;
+
+		/*
+		 * Duplicate MPIDRs are a recipe for disaster.
+		 * Scan all initialized entries and check for
+		 * duplicates. If any is found just bail out.
+		 * temp values were initialized to UINT_MAX
+		 * to avoid matching valid MPIDR[23:0] values.
+		 */
+		for (j = 0; j < cpuidx; j++)
+			if (WARN(tmp_map[j] == hwid, "Duplicate /cpu reg "
+						     "properties in the DT\n"))
+				return;
+
+		/*
+		 * Build a stashed array of MPIDR values. Numbering scheme
+		 * requires that if detected the boot CPU must be assigned
+		 * logical id 0. Other CPUs get sequential indexes starting
+		 * from 1. If a CPU node with a reg property matching the
+		 * boot CPU MPIDR is detected, this is recorded so that the
+		 * logical map built from DT is validated and can be used
+		 * to override the map created in smp_setup_processor_id().
+		 */
+		if (hwid == mpidr) {
+			i = 0;
+			bootcpu_valid = true;
+		} else {
+			i = cpuidx++;
+		}
+
+		if (WARN(cpuidx > nr_cpu_ids, "DT /cpu %u nodes greater than "
+					       "max cores %u, capping them\n",
+					       cpuidx, nr_cpu_ids)) {
+			cpuidx = nr_cpu_ids;
+			break;
+		}
+
+		tmp_map[i] = hwid;
+	}
+
+	if (WARN(!bootcpu_valid, "DT missing boot CPU MPIDR[23:0], "
+				 "fall back to default cpu_logical_map\n"))
+		return;
+
+	/*
+	 * Since the boot CPU node contains proper data, and all nodes have
+	 * a reg property, the DT CPU list can be considered valid and the
+	 * logical map created in smp_setup_processor_id() can be overridden
+	 */
+	for (i = 0; i < cpuidx; i++) {
+		set_cpu_possible(i, true);
+		cpu_logical_map(i) = tmp_map[i];
+		pr_debug("cpu logical map 0x%x\n", cpu_logical_map(i));
+	}
+}
+
 /**
  * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
  * @dt_phys: physical address of dt blob

arch/arm/kernel/hw_breakpoint.c

@@ -52,14 +52,14 @@ static u8 debug_arch;
 /* Maximum supported watchpoint length. */
 static u8 max_watchpoint_len;
 
-#define READ_WB_REG_CASE(OP2, M, VAL)		\
-	case ((OP2 << 4) + M):			\
-		ARM_DBG_READ(c ## M, OP2, VAL); \
+#define READ_WB_REG_CASE(OP2, M, VAL)			\
+	case ((OP2 << 4) + M):				\
+		ARM_DBG_READ(c0, c ## M, OP2, VAL);	\
 		break
 
-#define WRITE_WB_REG_CASE(OP2, M, VAL)		\
-	case ((OP2 << 4) + M):			\
-		ARM_DBG_WRITE(c ## M, OP2, VAL);\
+#define WRITE_WB_REG_CASE(OP2, M, VAL)			\
+	case ((OP2 << 4) + M):				\
+		ARM_DBG_WRITE(c0, c ## M, OP2, VAL);	\
 		break
 
 #define GEN_READ_WB_REG_CASES(OP2, VAL)		\
@@ -136,12 +136,12 @@ static u8 get_debug_arch(void)
 
 	/* Do we implement the extended CPUID interface? */
 	if (((read_cpuid_id() >> 16) & 0xf) != 0xf) {
-		pr_warning("CPUID feature registers not supported. "
-			   "Assuming v6 debug is present.\n");
+		pr_warn_once("CPUID feature registers not supported. "
+			     "Assuming v6 debug is present.\n");
 		return ARM_DEBUG_ARCH_V6;
 	}
 
-	ARM_DBG_READ(c0, 0, didr);
+	ARM_DBG_READ(c0, c0, 0, didr);
 	return (didr >> 16) & 0xf;
 }
 
@@ -169,7 +169,7 @@ static int debug_exception_updates_fsr(void)
 static int get_num_wrp_resources(void)
 {
 	u32 didr;
-	ARM_DBG_READ(c0, 0, didr);
+	ARM_DBG_READ(c0, c0, 0, didr);
 	return ((didr >> 28) & 0xf) + 1;
 }
 
@@ -177,7 +177,7 @@ static int get_num_wrp_resources(void)
 static int get_num_brp_resources(void)
 {
 	u32 didr;
-	ARM_DBG_READ(c0, 0, didr);
+	ARM_DBG_READ(c0, c0, 0, didr);
 	return ((didr >> 24) & 0xf) + 1;
 }
 
@@ -228,19 +228,17 @@ static int get_num_brps(void)
  * be put into halting debug mode at any time by an external debugger
  * but there is nothing we can do to prevent that.
  */
-static int enable_monitor_mode(void)
+static int monitor_mode_enabled(void)
 {
 	u32 dscr;
-	int ret = 0;
-
-	ARM_DBG_READ(c1, 0, dscr);
+	ARM_DBG_READ(c0, c1, 0, dscr);
+	return !!(dscr & ARM_DSCR_MDBGEN);
+}
 
-	/* Ensure that halting mode is disabled. */
-	if (WARN_ONCE(dscr & ARM_DSCR_HDBGEN,
-		"halting debug mode enabled. Unable to access hardware resources.\n")) {
-		ret = -EPERM;
-		goto out;
-	}
+static int enable_monitor_mode(void)
+{
+	u32 dscr;
+	ARM_DBG_READ(c0, c1, 0, dscr);
 
 	/* If monitor mode is already enabled, just return. */
 	if (dscr & ARM_DSCR_MDBGEN)
@@ -250,24 +248,27 @@ static int enable_monitor_mode(void)
 	switch (get_debug_arch()) {
 	case ARM_DEBUG_ARCH_V6:
 	case ARM_DEBUG_ARCH_V6_1:
-		ARM_DBG_WRITE(c1, 0, (dscr | ARM_DSCR_MDBGEN));
+		ARM_DBG_WRITE(c0, c1, 0, (dscr | ARM_DSCR_MDBGEN));
 		break;
 	case ARM_DEBUG_ARCH_V7_ECP14:
 	case ARM_DEBUG_ARCH_V7_1:
-		ARM_DBG_WRITE(c2, 2, (dscr | ARM_DSCR_MDBGEN));
+		ARM_DBG_WRITE(c0, c2, 2, (dscr | ARM_DSCR_MDBGEN));
+		isb();
 		break;
 	default:
-		ret = -ENODEV;
-		goto out;
+		return -ENODEV;
 	}
 
 	/* Check that the write made it through. */
-	ARM_DBG_READ(c1, 0, dscr);
-	if (!(dscr & ARM_DSCR_MDBGEN))
-		ret = -EPERM;
+	ARM_DBG_READ(c0, c1, 0, dscr);
+	if (!(dscr & ARM_DSCR_MDBGEN)) {
+		pr_warn_once("Failed to enable monitor mode on CPU %d.\n",
+				smp_processor_id());
+		return -EPERM;
+	}
 
 out:
-	return ret;
+	return 0;
 }
 
 int hw_breakpoint_slots(int type)
@@ -328,14 +329,9 @@ int arch_install_hw_breakpoint(struct perf_event *bp)
 {
 	struct arch_hw_breakpoint *info = counter_arch_bp(bp);
 	struct perf_event **slot, **slots;
-	int i, max_slots, ctrl_base, val_base, ret = 0;
+	int i, max_slots, ctrl_base, val_base;
 	u32 addr, ctrl;
 
-	/* Ensure that we are in monitor mode and halting mode is disabled. */
-	ret = enable_monitor_mode();
-	if (ret)
-		goto out;
-
 	addr = info->address;
 	ctrl = encode_ctrl_reg(info->ctrl) | 0x1;
 
@@ -362,9 +358,9 @@ int arch_install_hw_breakpoint(struct perf_event *bp)
 		}
 	}
 
-	if (WARN_ONCE(i == max_slots, "Can't find any breakpoint slot\n")) {
-		ret = -EBUSY;
-		goto out;
+	if (i == max_slots) {
+		pr_warning("Can't find any breakpoint slot\n");
+		return -EBUSY;
 	}
 
 	/* Override the breakpoint data with the step data. */
@@ -383,9 +379,7 @@ int arch_install_hw_breakpoint(struct perf_event *bp)
 
 	/* Setup the control register. */
 	write_wb_reg(ctrl_base + i, ctrl);
-
-out:
-	return ret;
+	return 0;
 }
 
 void arch_uninstall_hw_breakpoint(struct perf_event *bp)
@@ -416,8 +410,10 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
 		}
 	}
 
-	if (WARN_ONCE(i == max_slots, "Can't find any breakpoint slot\n"))
+	if (i == max_slots) {
+		pr_warning("Can't find any breakpoint slot\n");
 		return;
+	}
 
 	/* Ensure that we disable the mismatch breakpoint. */
 	if (info->ctrl.type != ARM_BREAKPOINT_EXECUTE &&
@@ -596,6 +592,10 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
 	int ret = 0;
 	u32 offset, alignment_mask = 0x3;
 
+	/* Ensure that we are in monitor debug mode. */
+	if (!monitor_mode_enabled())
+		return -ENODEV;
+
 	/* Build the arch_hw_breakpoint. */
 	ret = arch_build_bp_info(bp);
 	if (ret)
@@ -858,7 +858,7 @@ static int hw_breakpoint_pending(unsigned long addr, unsigned int fsr,
 		local_irq_enable();
 
 	/* We only handle watchpoints and hardware breakpoints. */
-	ARM_DBG_READ(c1, 0, dscr);
+	ARM_DBG_READ(c0, c1, 0, dscr);
 
 	/* Perform perf callbacks. */
 	switch (ARM_DSCR_MOE(dscr)) {
@@ -906,7 +906,7 @@ static struct undef_hook debug_reg_hook = {
 static void reset_ctrl_regs(void *unused)
 {
 	int i, raw_num_brps, err = 0, cpu = smp_processor_id();
-	u32 dbg_power;
+	u32 val;
 
 	/*
 	 * v7 debug contains save and restore registers so that debug state
@@ -919,23 +919,30 @@ static void reset_ctrl_regs(void *unused)
 	switch (debug_arch) {
 	case ARM_DEBUG_ARCH_V6:
 	case ARM_DEBUG_ARCH_V6_1:
-		/* ARMv6 cores just need to reset the registers. */
-		goto reset_regs;
+		/* ARMv6 cores clear the registers out of reset. */
+		goto out_mdbgen;
 	case ARM_DEBUG_ARCH_V7_ECP14:
 		/*
 		 * Ensure sticky power-down is clear (i.e. debug logic is
 		 * powered up).
 		 */
-		asm volatile("mrc p14, 0, %0, c1, c5, 4" : "=r" (dbg_power));
-		if ((dbg_power & 0x1) == 0)
+		ARM_DBG_READ(c1, c5, 4, val);
+		if ((val & 0x1) == 0)
 			err = -EPERM;
+
+		/*
+		 * Check whether we implement OS save and restore.
+		 */
+		ARM_DBG_READ(c1, c1, 4, val);
+		if ((val & 0x9) == 0)
+			goto clear_vcr;
 		break;
 	case ARM_DEBUG_ARCH_V7_1:
 		/*
 		 * Ensure the OS double lock is clear.
 		 */
-		asm volatile("mrc p14, 0, %0, c1, c3, 4" : "=r" (dbg_power));
-		if ((dbg_power & 0x1) == 1)
+		ARM_DBG_READ(c1, c3, 4, val);
+		if ((val & 0x1) == 1)
 			err = -EPERM;
 		break;
 	}
@@ -947,24 +954,29 @@ static void reset_ctrl_regs(void *unused)
 	}
 
 	/*
-	 * Unconditionally clear the lock by writing a value
+	 * Unconditionally clear the OS lock by writing a value
 	 * other than 0xC5ACCE55 to the access register.
 	 */
-	asm volatile("mcr p14, 0, %0, c1, c0, 4" : : "r" (0));
+	ARM_DBG_WRITE(c1, c0, 4, 0);
 	isb();
 
 	/*
 	 * Clear any configured vector-catch events before
 	 * enabling monitor mode.
 	 */
-	asm volatile("mcr p14, 0, %0, c0, c7, 0" : : "r" (0));
+clear_vcr:
+	ARM_DBG_WRITE(c0, c7, 0, 0);
 	isb();
 
-reset_regs:
-	if (enable_monitor_mode())
+	if (cpumask_intersects(&debug_err_mask, cpumask_of(cpu))) {
+		pr_warning("CPU %d failed to disable vector catch\n", cpu);
 		return;
+	}
 
-	/* We must also reset any reserved registers. */
+	/*
+	 * The control/value register pairs are UNKNOWN out of reset so
+	 * clear them to avoid spurious debug events.
+	 */
 	raw_num_brps = get_num_brp_resources();
 	for (i = 0; i < raw_num_brps; ++i) {
 		write_wb_reg(ARM_BASE_BCR + i, 0UL);
@@ -975,6 +987,19 @@ static void reset_ctrl_regs(void *unused)
 		write_wb_reg(ARM_BASE_WCR + i, 0UL);
 		write_wb_reg(ARM_BASE_WVR + i, 0UL);
 	}
+
+	if (cpumask_intersects(&debug_err_mask, cpumask_of(cpu))) {
+		pr_warning("CPU %d failed to clear debug register pairs\n", cpu);
+		return;
+	}
+
+	/*
+	 * Have a crack at enabling monitor mode. We don't actually need
+	 * it yet, but reporting an error early is useful if it fails.
+	 */
+out_mdbgen:
+	if (enable_monitor_mode())
+		cpumask_or(&debug_err_mask, &debug_err_mask, cpumask_of(cpu));
 }
 
 static int __cpuinit dbg_reset_notify(struct notifier_block *self,
@@ -992,8 +1017,6 @@ static struct notifier_block __cpuinitdata dbg_reset_nb = {
 
 static int __init arch_hw_breakpoint_init(void)
 {
-	u32 dscr;
-
 	debug_arch = get_debug_arch();
 
 	if (!debug_arch_supported()) {
@@ -1028,17 +1051,10 @@ static int __init arch_hw_breakpoint_init(void)
 		core_num_brps, core_has_mismatch_brps() ? "(+1 reserved) " :
 		"", core_num_wrps);
 
-	ARM_DBG_READ(c1, 0, dscr);
-	if (dscr & ARM_DSCR_HDBGEN) {
-		max_watchpoint_len = 4;
-		pr_warning("halting debug mode enabled. Assuming maximum watchpoint size of %u bytes.\n",
-			   max_watchpoint_len);
-	} else {
-		/* Work out the maximum supported watchpoint length. */
-		max_watchpoint_len = get_max_wp_len();
-		pr_info("maximum watchpoint size is %u bytes.\n",
-				max_watchpoint_len);
-	}
+	/* Work out the maximum supported watchpoint length. */
+	max_watchpoint_len = get_max_wp_len();
+	pr_info("maximum watchpoint size is %u bytes.\n",
+			max_watchpoint_len);
 
 	/* Register debug fault handler. */
 	hook_fault_code(FAULT_CODE_DEBUG, hw_breakpoint_pending, SIGTRAP,

arch/arm/kernel/perf_event.c

@@ -86,12 +86,10 @@ armpmu_map_event(struct perf_event *event,
 	return -ENOENT;
 }
 
-int
-armpmu_event_set_period(struct perf_event *event,
-			struct hw_perf_event *hwc,
-			int idx)
+int armpmu_event_set_period(struct perf_event *event)
 {
 	struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+	struct hw_perf_event *hwc = &event->hw;
 	s64 left = local64_read(&hwc->period_left);
 	s64 period = hwc->sample_period;
 	int ret = 0;
@@ -119,24 +117,22 @@ armpmu_event_set_period(struct perf_event *event,
 
 	local64_set(&hwc->prev_count, (u64)-left);
 
-	armpmu->write_counter(idx, (u64)(-left) & 0xffffffff);
+	armpmu->write_counter(event, (u64)(-left) & 0xffffffff);
 
 	perf_event_update_userpage(event);
 
 	return ret;
 }
 
-u64
-armpmu_event_update(struct perf_event *event,
-		    struct hw_perf_event *hwc,
-		    int idx)
+u64 armpmu_event_update(struct perf_event *event)
 {
 	struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
+	struct hw_perf_event *hwc = &event->hw;
 	u64 delta, prev_raw_count, new_raw_count;
 
 again:
 	prev_raw_count = local64_read(&hwc->prev_count);
-	new_raw_count = armpmu->read_counter(idx);
+	new_raw_count = armpmu->read_counter(event);
 
 	if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
 			     new_raw_count) != prev_raw_count)
@@ -159,7 +155,7 @@ armpmu_read(struct perf_event *event)
 	if (hwc->idx < 0)
 		return;
 
-	armpmu_event_update(event, hwc, hwc->idx);
+	armpmu_event_update(event);
 }
 
 static void
@@ -173,14 +169,13 @@ armpmu_stop(struct perf_event *event, int flags)
 	 * PERF_EF_UPDATE, see comments in armpmu_start().
 	 */
 	if (!(hwc->state & PERF_HES_STOPPED)) {
-		armpmu->disable(hwc, hwc->idx);
-		armpmu_event_update(event, hwc, hwc->idx);
+		armpmu->disable(event);
+		armpmu_event_update(event);
 		hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
 	}
 }
 
-static void
-armpmu_start(struct perf_event *event, int flags)
+static void armpmu_start(struct perf_event *event, int flags)
 {
 	struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
 	struct hw_perf_event *hwc = &event->hw;
@@ -200,8 +195,8 @@ armpmu_start(struct perf_event *event, int flags)
 	 * get an interrupt too soon or *way* too late if the overflow has
 	 * happened since disabling.
 	 */
-	armpmu_event_set_period(event, hwc, hwc->idx);
-	armpmu->enable(hwc, hwc->idx);
+	armpmu_event_set_period(event);
+	armpmu->enable(event);
 }
 
 static void
@@ -233,7 +228,7 @@ armpmu_add(struct perf_event *event, int flags)
 	perf_pmu_disable(event->pmu);
 
 	/* If we don't have a space for the counter then finish early. */
-	idx = armpmu->get_event_idx(hw_events, hwc);
+	idx = armpmu->get_event_idx(hw_events, event);
 	if (idx < 0) {
 		err = idx;
 		goto out;
@@ -244,7 +239,7 @@ armpmu_add(struct perf_event *event, int flags)
 	 * sure it is disabled.
 	 */
 	event->hw.idx = idx;
-	armpmu->disable(hwc, idx);
+	armpmu->disable(event);
 	hw_events->events[idx] = event;
 
 	hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
@@ -264,13 +259,12 @@ validate_event(struct pmu_hw_events *hw_events,
 	       struct perf_event *event)
 {
 	struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
-	struct hw_perf_event fake_event = event->hw;
 	struct pmu *leader_pmu = event->group_leader->pmu;
 
 	if (event->pmu != leader_pmu || event->state <= PERF_EVENT_STATE_OFF)
 		return 1;
 
-	return armpmu->get_event_idx(hw_events, &fake_event) >= 0;
+	return armpmu->get_event_idx(hw_events, event) >= 0;
 }
 
 static int
@@ -316,7 +310,7 @@ static irqreturn_t armpmu_dispatch_irq(int irq, void *dev)
 static void
 armpmu_release_hardware(struct arm_pmu *armpmu)
 {
-	armpmu->free_irq();
+	armpmu->free_irq(armpmu);
 	pm_runtime_put_sync(&armpmu->plat_device->dev);
 }
 
@@ -330,7 +324,7 @@ armpmu_reserve_hardware(struct arm_pmu *armpmu)
 		return -ENODEV;
 
 	pm_runtime_get_sync(&pmu_device->dev);
-	err = armpmu->request_irq(armpmu_dispatch_irq);
+	err = armpmu->request_irq(armpmu, armpmu_dispatch_irq);
 	if (err) {
 		armpmu_release_hardware(armpmu);
 		return err;
@@ -465,13 +459,13 @@ static void armpmu_enable(struct pmu *pmu)
 	int enabled = bitmap_weight(hw_events->used_mask, armpmu->num_events);
 
 	if (enabled)
-		armpmu->start();
+		armpmu->start(armpmu);
 }
 
 static void armpmu_disable(struct pmu *pmu)
 {
 	struct arm_pmu *armpmu = to_arm_pmu(pmu);
-	armpmu->stop();
+	armpmu->stop(armpmu);
 }
 
 #ifdef CONFIG_PM_RUNTIME
@@ -517,12 +511,13 @@ static void __init armpmu_init(struct arm_pmu *armpmu)
 	};
 }
 
-int armpmu_register(struct arm_pmu *armpmu, char *name, int type)
+int armpmu_register(struct arm_pmu *armpmu, int type)
 {
 	armpmu_init(armpmu);
+	pm_runtime_enable(&armpmu->plat_device->dev);
 	pr_info("enabled with %s PMU driver, %d counters available\n",
 			armpmu->name, armpmu->num_events);
-	return perf_pmu_register(&armpmu->pmu, name, type);
+	return perf_pmu_register(&armpmu->pmu, armpmu->name, type);
 }
 
 /*
@@ -576,6 +571,10 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
 {
 	struct frame_tail __user *tail;
 
+	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+		/* We don't support guest os callchain now */
+		return;
+	}
 
 	tail = (struct frame_tail __user *)regs->ARM_fp - 1;
 
@@ -603,9 +602,41 @@ perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
 {
 	struct stackframe fr;
 
+	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+		/* We don't support guest os callchain now */
+		return;
+	}
+
 	fr.fp = regs->ARM_fp;
 	fr.sp = regs->ARM_sp;
 	fr.lr = regs->ARM_lr;
 	fr.pc = regs->ARM_pc;
 	walk_stackframe(&fr, callchain_trace, entry);
 }
+
+unsigned long perf_instruction_pointer(struct pt_regs *regs)
+{
+	if (perf_guest_cbs && perf_guest_cbs->is_in_guest())
+		return perf_guest_cbs->get_guest_ip();
+
+	return instruction_pointer(regs);
+}
+
+unsigned long perf_misc_flags(struct pt_regs *regs)
+{
+	int misc = 0;
+
+	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
+		if (perf_guest_cbs->is_user_mode())
+			misc |= PERF_RECORD_MISC_GUEST_USER;
+		else
+			misc |= PERF_RECORD_MISC_GUEST_KERNEL;
+	} else {
+		if (user_mode(regs))
+			misc |= PERF_RECORD_MISC_USER;
+		else
+			misc |= PERF_RECORD_MISC_KERNEL;
+	}
+
+	return misc;
+}

arch/arm/kernel/perf_event_cpu.c

@@ -23,6 +23,7 @@
 #include <linux/kernel.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/slab.h>
 #include <linux/spinlock.h>
 
 #include <asm/cputype.h>
@@ -45,7 +46,7 @@ const char *perf_pmu_name(void)
 	if (!cpu_pmu)
 		return NULL;
 
-	return cpu_pmu->pmu.name;
+	return cpu_pmu->name;
 }
 EXPORT_SYMBOL_GPL(perf_pmu_name);
 
@@ -70,7 +71,7 @@ static struct pmu_hw_events *cpu_pmu_get_cpu_events(void)
 	return &__get_cpu_var(cpu_hw_events);
 }
 
-static void cpu_pmu_free_irq(void)
+static void cpu_pmu_free_irq(struct arm_pmu *cpu_pmu)
 {
 	int i, irq, irqs;
 	struct platform_device *pmu_device = cpu_pmu->plat_device;
@@ -86,7 +87,7 @@ static void cpu_pmu_free_irq(void)
 	}
 }
 
-static int cpu_pmu_request_irq(irq_handler_t handler)
+static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler)
 {
 	int i, err, irq, irqs;
 	struct platform_device *pmu_device = cpu_pmu->plat_device;
@@ -147,7 +148,7 @@ static void __devinit cpu_pmu_init(struct arm_pmu *cpu_pmu)
 
 	/* Ensure the PMU has sane values out of reset. */
 	if (cpu_pmu && cpu_pmu->reset)
-		on_each_cpu(cpu_pmu->reset, NULL, 1);
+		on_each_cpu(cpu_pmu->reset, cpu_pmu, 1);
 }
 
 /*
@@ -163,7 +164,9 @@ static int __cpuinit cpu_pmu_notify(struct notifier_block *b,
 		return NOTIFY_DONE;
 
 	if (cpu_pmu && cpu_pmu->reset)
-		cpu_pmu->reset(NULL);
+		cpu_pmu->reset(cpu_pmu);
+	else
+		return NOTIFY_DONE;
 
 	return NOTIFY_OK;
 }
@@ -195,13 +198,13 @@ static struct platform_device_id __devinitdata cpu_pmu_plat_device_ids[] = {
 /*
  * CPU PMU identification and probing.
  */
-static struct arm_pmu *__devinit probe_current_pmu(void)
+static int __devinit probe_current_pmu(struct arm_pmu *pmu)
 {
-	struct arm_pmu *pmu = NULL;
 	int cpu = get_cpu();
 	unsigned long cpuid = read_cpuid_id();
 	unsigned long implementor = (cpuid & 0xFF000000) >> 24;
 	unsigned long part_number = (cpuid & 0xFFF0);
+	int ret = -ENODEV;
 
 	pr_info("probing PMU on CPU %d\n", cpu);
 
@@ -211,25 +214,25 @@ static struct arm_pmu *__devinit probe_current_pmu(void)
 		case 0xB360:	/* ARM1136 */
 		case 0xB560:	/* ARM1156 */
 		case 0xB760:	/* ARM1176 */
-			pmu = armv6pmu_init();
+			ret = armv6pmu_init(pmu);
 			break;
 		case 0xB020:	/* ARM11mpcore */
-			pmu = armv6mpcore_pmu_init();
+			ret = armv6mpcore_pmu_init(pmu);
 			break;
 		case 0xC080:	/* Cortex-A8 */
-			pmu = armv7_a8_pmu_init();
+			ret = armv7_a8_pmu_init(pmu);
 			break;
 		case 0xC090:	/* Cortex-A9 */
-			pmu = armv7_a9_pmu_init();
+			ret = armv7_a9_pmu_init(pmu);
 			break;
 		case 0xC050:	/* Cortex-A5 */
-			pmu = armv7_a5_pmu_init();
+			ret = armv7_a5_pmu_init(pmu);
 			break;
 		case 0xC0F0:	/* Cortex-A15 */
-			pmu = armv7_a15_pmu_init();
+			ret = armv7_a15_pmu_init(pmu);
 			break;
 		case 0xC070:	/* Cortex-A7 */
-			pmu = armv7_a7_pmu_init();
+			ret = armv7_a7_pmu_init(pmu);
 			break;
 		}
 	/* Intel CPUs [xscale]. */
@@ -237,43 +240,54 @@ static struct arm_pmu *__devinit probe_current_pmu(void)
 		part_number = (cpuid >> 13) & 0x7;
 		switch (part_number) {
 		case 1:
-			pmu = xscale1pmu_init();
+			ret = xscale1pmu_init(pmu);
 			break;
 		case 2:
-			pmu = xscale2pmu_init();
+			ret = xscale2pmu_init(pmu);
 			break;
 		}
 	}
 
 	put_cpu();
-	return pmu;
+	return ret;
 }
 
 static int __devinit cpu_pmu_device_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *of_id;
-	struct arm_pmu *(*init_fn)(void);
+	int (*init_fn)(struct arm_pmu *);
 	struct device_node *node = pdev->dev.of_node;
+	struct arm_pmu *pmu;
+	int ret = -ENODEV;
 
 	if (cpu_pmu) {
 		pr_info("attempt to register multiple PMU devices!");
 		return -ENOSPC;
 	}
 
+	pmu = kzalloc(sizeof(struct arm_pmu), GFP_KERNEL);
+	if (!pmu) {
+		pr_info("failed to allocate PMU device!");
+		return -ENOMEM;
+	}
+
 	if (node && (of_id = of_match_node(cpu_pmu_of_device_ids, pdev->dev.of_node))) {
 		init_fn = of_id->data;
-		cpu_pmu = init_fn();
+		ret = init_fn(pmu);
 	} else {
-		cpu_pmu = probe_current_pmu();
+		ret = probe_current_pmu(pmu);
 	}
 
-	if (!cpu_pmu)
-		return -ENODEV;
+	if (ret) {
+		pr_info("failed to register PMU devices!");
+		kfree(pmu);
+		return ret;
+	}
 
+	cpu_pmu = pmu;
 	cpu_pmu->plat_device = pdev;
 	cpu_pmu_init(cpu_pmu);
-	register_cpu_notifier(&cpu_pmu_hotplug_notifier);
-	armpmu_register(cpu_pmu, cpu_pmu->name, PERF_TYPE_RAW);
+	armpmu_register(cpu_pmu, PERF_TYPE_RAW);
 
 	return 0;
 }
@@ -290,6 +304,16 @@ static struct platform_driver cpu_pmu_driver = {
 
 static int __init register_pmu_driver(void)
 {
-	return platform_driver_register(&cpu_pmu_driver);
+	int err;
+
+	err = register_cpu_notifier(&cpu_pmu_hotplug_notifier);
+	if (err)
+		return err;
+
+	err = platform_driver_register(&cpu_pmu_driver);
+	if (err)
+		unregister_cpu_notifier(&cpu_pmu_hotplug_notifier);
+
+	return err;
 }
 device_initcall(register_pmu_driver);

arch/arm/kernel/perf_event_v6.c

@@ -401,9 +401,10 @@ armv6_pmcr_counter_has_overflowed(unsigned long pmcr,
 	return ret;
 }
 
-static inline u32
-armv6pmu_read_counter(int counter)
+static inline u32 armv6pmu_read_counter(struct perf_event *event)
 {
+	struct hw_perf_event *hwc = &event->hw;
+	int counter = hwc->idx;
 	unsigned long value = 0;
 
 	if (ARMV6_CYCLE_COUNTER == counter)
@@ -418,10 +419,11 @@ armv6pmu_read_counter(int counter)
 	return value;
 }
 
-static inline void
-armv6pmu_write_counter(int counter,
-		       u32 value)
+static inline void armv6pmu_write_counter(struct perf_event *event, u32 value)
 {
+	struct hw_perf_event *hwc = &event->hw;
+	int counter = hwc->idx;
+
 	if (ARMV6_CYCLE_COUNTER == counter)
 		asm volatile("mcr   p15, 0, %0, c15, c12, 1" : : "r"(value));
 	else if (ARMV6_COUNTER0 == counter)
@@ -432,12 +434,13 @@ armv6pmu_write_counter(int counter,
 		WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 }
 
-static void
-armv6pmu_enable_event(struct hw_perf_event *hwc,
-		      int idx)
+static void armv6pmu_enable_event(struct perf_event *event)
 {
 	unsigned long val, mask, evt, flags;
+	struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
+	struct hw_perf_event *hwc = &event->hw;
 	struct pmu_hw_events *events = cpu_pmu->get_hw_events();
+	int idx = hwc->idx;
 
 	if (ARMV6_CYCLE_COUNTER == idx) {
 		mask	= 0;
@@ -473,7 +476,8 @@ armv6pmu_handle_irq(int irq_num,
 {
 	unsigned long pmcr = armv6_pmcr_read();
 	struct perf_sample_data data;
-	struct pmu_hw_events *cpuc;
+	struct arm_pmu *cpu_pmu = (struct arm_pmu *)dev;
+	struct pmu_hw_events *cpuc = cpu_pmu->get_hw_events();
 	struct pt_regs *regs;
 	int idx;
 
@@ -489,7 +493,6 @@ armv6pmu_handle_irq(int irq_num,
 	 */
 	armv6_pmcr_write(pmcr);
 
-	cpuc = &__get_cpu_var(cpu_hw_events);
 	for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
 		struct perf_event *event = cpuc->events[idx];
 		struct hw_perf_event *hwc;
@@ -506,13 +509,13 @@ armv6pmu_handle_irq(int irq_num,
 			continue;
 
 		hwc = &event->hw;
-		armpmu_event_update(event, hwc, idx);
+		armpmu_event_update(event);
 		perf_sample_data_init(&data, 0, hwc->last_period);
-		if (!armpmu_event_set_period(event, hwc, idx))
+		if (!armpmu_event_set_period(event))
 			continue;
 
 		if (perf_event_overflow(event, &data, regs))
-			cpu_pmu->disable(hwc, idx);
+			cpu_pmu->disable(event);
 	}
 
 	/*
@@ -527,8 +530,7 @@ armv6pmu_handle_irq(int irq_num,
 	return IRQ_HANDLED;
 }
 
-static void
-armv6pmu_start(void)
+static void armv6pmu_start(struct arm_pmu *cpu_pmu)
 {
 	unsigned long flags, val;
 	struct pmu_hw_events *events = cpu_pmu->get_hw_events();
@@ -540,8 +542,7 @@ armv6pmu_start(void)
 	raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 }
 
-static void
-armv6pmu_stop(void)
+static void armv6pmu_stop(struct arm_pmu *cpu_pmu)
 {
 	unsigned long flags, val;
 	struct pmu_hw_events *events = cpu_pmu->get_hw_events();
@@ -555,10 +556,11 @@ armv6pmu_stop(void)
 
 static int
 armv6pmu_get_event_idx(struct pmu_hw_events *cpuc,
-		       struct hw_perf_event *event)
+				struct perf_event *event)
 {
+	struct hw_perf_event *hwc = &event->hw;
 	/* Always place a cycle counter into the cycle counter. */
-	if (ARMV6_PERFCTR_CPU_CYCLES == event->config_base) {
+	if (ARMV6_PERFCTR_CPU_CYCLES == hwc->config_base) {
 		if (test_and_set_bit(ARMV6_CYCLE_COUNTER, cpuc->used_mask))
 			return -EAGAIN;
 
@@ -579,12 +581,13 @@ armv6pmu_get_event_idx(struct pmu_hw_events *cpuc,
 	}
 }
 
-static void
-armv6pmu_disable_event(struct hw_perf_event *hwc,
-		       int idx)
+static void armv6pmu_disable_event(struct perf_event *event)
 {
 	unsigned long val, mask, evt, flags;
+	struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
+	struct hw_perf_event *hwc = &event->hw;
 	struct pmu_hw_events *events = cpu_pmu->get_hw_events();
+	int idx = hwc->idx;
 
 	if (ARMV6_CYCLE_COUNTER == idx) {
 		mask	= ARMV6_PMCR_CCOUNT_IEN;
@@ -613,12 +616,13 @@ armv6pmu_disable_event(struct hw_perf_event *hwc,
 	raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 }
 
-static void
-armv6mpcore_pmu_disable_event(struct hw_perf_event *hwc,
-			      int idx)
+static void armv6mpcore_pmu_disable_event(struct perf_event *event)
 {
 	unsigned long val, mask, flags, evt = 0;
+	struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
+	struct hw_perf_event *hwc = &event->hw;
 	struct pmu_hw_events *events = cpu_pmu->get_hw_events();
+	int idx = hwc->idx;
 
 	if (ARMV6_CYCLE_COUNTER == idx) {
 		mask	= ARMV6_PMCR_CCOUNT_IEN;
@@ -649,24 +653,22 @@ static int armv6_map_event(struct perf_event *event)
 				&armv6_perf_cache_map, 0xFF);
 }
 
-static struct arm_pmu armv6pmu = {
-	.name			= "v6",
-	.handle_irq		= armv6pmu_handle_irq,
-	.enable			= armv6pmu_enable_event,
-	.disable		= armv6pmu_disable_event,
-	.read_counter		= armv6pmu_read_counter,
-	.write_counter		= armv6pmu_write_counter,
-	.get_event_idx		= armv6pmu_get_event_idx,
-	.start			= armv6pmu_start,
-	.stop			= armv6pmu_stop,
-	.map_event		= armv6_map_event,
-	.num_events		= 3,
-	.max_period		= (1LLU << 32) - 1,
-};
-
-static struct arm_pmu *__devinit armv6pmu_init(void)
+static int __devinit armv6pmu_init(struct arm_pmu *cpu_pmu)
 {
-	return &armv6pmu;
+	cpu_pmu->name		= "v6";
+	cpu_pmu->handle_irq	= armv6pmu_handle_irq;
+	cpu_pmu->enable		= armv6pmu_enable_event;
+	cpu_pmu->disable	= armv6pmu_disable_event;
+	cpu_pmu->read_counter	= armv6pmu_read_counter;
+	cpu_pmu->write_counter	= armv6pmu_write_counter;
+	cpu_pmu->get_event_idx	= armv6pmu_get_event_idx;
+	cpu_pmu->start		= armv6pmu_start;
+	cpu_pmu->stop		= armv6pmu_stop;
+	cpu_pmu->map_event	= armv6_map_event;
+	cpu_pmu->num_events	= 3;
+	cpu_pmu->max_period	= (1LLU << 32) - 1;
+
+	return 0;
 }
 
 /*
@@ -683,33 +685,31 @@ static int armv6mpcore_map_event(struct perf_event *event)
 				&armv6mpcore_perf_cache_map, 0xFF);
 }
 
-static struct arm_pmu armv6mpcore_pmu = {
-	.name			= "v6mpcore",
-	.handle_irq		= armv6pmu_handle_irq,
-	.enable			= armv6pmu_enable_event,
-	.disable		= armv6mpcore_pmu_disable_event,
-	.read_counter		= armv6pmu_read_counter,
-	.write_counter		= armv6pmu_write_counter,
-	.get_event_idx		= armv6pmu_get_event_idx,
-	.start			= armv6pmu_start,
-	.stop			= armv6pmu_stop,
-	.map_event		= armv6mpcore_map_event,
-	.num_events		= 3,
-	.max_period		= (1LLU << 32) - 1,
-};
-
-static struct arm_pmu *__devinit armv6mpcore_pmu_init(void)
+static int __devinit armv6mpcore_pmu_init(struct arm_pmu *cpu_pmu)
 {
-	return &armv6mpcore_pmu;
+	cpu_pmu->name		= "v6mpcore";
+	cpu_pmu->handle_irq	= armv6pmu_handle_irq;
+	cpu_pmu->enable		= armv6pmu_enable_event;
+	cpu_pmu->disable	= armv6mpcore_pmu_disable_event;
+	cpu_pmu->read_counter	= armv6pmu_read_counter;
+	cpu_pmu->write_counter	= armv6pmu_write_counter;
+	cpu_pmu->get_event_idx	= armv6pmu_get_event_idx;
+	cpu_pmu->start		= armv6pmu_start;
+	cpu_pmu->stop		= armv6pmu_stop;
+	cpu_pmu->map_event	= armv6mpcore_map_event;
+	cpu_pmu->num_events	= 3;
+	cpu_pmu->max_period	= (1LLU << 32) - 1;
+
+	return 0;
 }
 #else
-static struct arm_pmu *__devinit armv6pmu_init(void)
+static int armv6pmu_init(struct arm_pmu *cpu_pmu)
 {
-	return NULL;
+	return -ENODEV;
 }
 
-static struct arm_pmu *__devinit armv6mpcore_pmu_init(void)
+static int armv6mpcore_pmu_init(struct arm_pmu *cpu_pmu)
 {
-	return NULL;
+	return -ENODEV;
 }
 #endif	/* CONFIG_CPU_V6 || CONFIG_CPU_V6K */

arch/arm/kernel/setup.c

@@ -383,6 +383,12 @@ void cpu_init(void)
 		BUG();
 	}
 
+	/*
+	 * This only works on resume and secondary cores. For booting on the
+	 * boot cpu, smp_prepare_boot_cpu is called after percpu area setup.
+	 */
+	set_my_cpu_offset(per_cpu_offset(cpu));
+
 	cpu_proc_init();
 
 	/*
@@ -426,13 +432,14 @@ int __cpu_logical_map[NR_CPUS];
 void __init smp_setup_processor_id(void)
 {
 	int i;
-	u32 cpu = is_smp() ? read_cpuid_mpidr() & 0xff : 0;
+	u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0;
+	u32 cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
 
 	cpu_logical_map(0) = cpu;
-	for (i = 1; i < NR_CPUS; ++i)
+	for (i = 1; i < nr_cpu_ids; ++i)
 		cpu_logical_map(i) = i == cpu ? 0 : i;
 
-	printk(KERN_INFO "Booting Linux on physical CPU %d\n", cpu);
+	printk(KERN_INFO "Booting Linux on physical CPU 0x%x\n", mpidr);
 }
 
 static void __init setup_processor(void)
@@ -758,6 +765,7 @@ void __init setup_arch(char **cmdline_p)
 
 	unflatten_device_tree();
 
+	arm_dt_init_cpu_maps();
 #ifdef CONFIG_SMP
 	if (is_smp()) {
 		smp_set_ops(mdesc->smp);
@@ -841,12 +849,9 @@ static const char *hwcap_str[] = {
 
 static int c_show(struct seq_file *m, void *v)
 {
-	int i;
+	int i, j;
+	u32 cpuid;
 
-	seq_printf(m, "Processor\t: %s rev %d (%s)\n",
-		   cpu_name, read_cpuid_id() & 15, elf_platform);
-
-#if defined(CONFIG_SMP)
 	for_each_online_cpu(i) {
 		/*
 		 * glibc reads /proc/cpuinfo to determine the number of
@@ -854,45 +859,48 @@ static int c_show(struct seq_file *m, void *v)
 		 * "processor".  Give glibc what it expects.
 		 */
 		seq_printf(m, "processor\t: %d\n", i);
-		seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
+		cpuid = is_smp() ? per_cpu(cpu_data, i).cpuid : read_cpuid_id();
+		seq_printf(m, "model name\t: %s rev %d (%s)\n",
+			   cpu_name, cpuid & 15, elf_platform);
+
+#if defined(CONFIG_SMP)
+		seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 			   per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
 			   (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
-	}
-#else /* CONFIG_SMP */
-	seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
-		   loops_per_jiffy / (500000/HZ),
-		   (loops_per_jiffy / (5000/HZ)) % 100);
+#else
+		seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
+			   loops_per_jiffy / (500000/HZ),
+			   (loops_per_jiffy / (5000/HZ)) % 100);
 #endif
+		/* dump out the processor features */
+		seq_puts(m, "Features\t: ");
 
-	/* dump out the processor features */
-	seq_puts(m, "Features\t: ");
-
-	for (i = 0; hwcap_str[i]; i++)
-		if (elf_hwcap & (1 << i))
-			seq_printf(m, "%s ", hwcap_str[i]);
+		for (j = 0; hwcap_str[j]; j++)
+			if (elf_hwcap & (1 << j))
+				seq_printf(m, "%s ", hwcap_str[j]);
 
-	seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
-	seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
+		seq_printf(m, "\nCPU implementer\t: 0x%02x\n", cpuid >> 24);
+		seq_printf(m, "CPU architecture: %s\n",
+			   proc_arch[cpu_architecture()]);
 
-	if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
-		/* pre-ARM7 */
-		seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
-	} else {
-		if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
-			/* ARM7 */
-			seq_printf(m, "CPU variant\t: 0x%02x\n",
-				   (read_cpuid_id() >> 16) & 127);
+		if ((cpuid & 0x0008f000) == 0x00000000) {
+			/* pre-ARM7 */
+			seq_printf(m, "CPU part\t: %07x\n", cpuid >> 4);
 		} else {
-			/* post-ARM7 */
-			seq_printf(m, "CPU variant\t: 0x%x\n",
-				   (read_cpuid_id() >> 20) & 15);
+			if ((cpuid & 0x0008f000) == 0x00007000) {
+				/* ARM7 */
+				seq_printf(m, "CPU variant\t: 0x%02x\n",
+					   (cpuid >> 16) & 127);
+			} else {
+				/* post-ARM7 */
+				seq_printf(m, "CPU variant\t: 0x%x\n",
+					   (cpuid >> 20) & 15);
+			}
+			seq_printf(m, "CPU part\t: 0x%03x\n",
+				   (cpuid >> 4) & 0xfff);
 		}
-		seq_printf(m, "CPU part\t: 0x%03x\n",
-			   (read_cpuid_id() >> 4) & 0xfff);
+		seq_printf(m, "CPU revision\t: %d\n\n", cpuid & 15);
 	}
-	seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
-
-	seq_puts(m, "\n");
 
 	seq_printf(m, "Hardware\t: %s\n", machine_name);
 	seq_printf(m, "Revision\t: %04x\n", system_rev);

arch/arm/kernel/smp.c

@@ -281,6 +281,7 @@ static void __cpuinit smp_store_cpu_info(unsigned int cpuid)
 	struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid);
 
 	cpu_info->loops_per_jiffy = loops_per_jiffy;
+	cpu_info->cpuid = read_cpuid_id();
 
 	store_cpu_topology(cpuid);
 }
@@ -313,9 +314,10 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
 	current->active_mm = mm;
 	cpumask_set_cpu(cpu, mm_cpumask(mm));
 
+	cpu_init();
+
 	printk("CPU%u: Booted secondary processor\n", cpu);
 
-	cpu_init();
 	preempt_disable();
 	trace_hardirqs_off();
 
@@ -371,6 +373,7 @@ void __init smp_cpus_done(unsigned int max_cpus)
 
 void __init smp_prepare_boot_cpu(void)
 {
+	set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
 }
 
 void __init smp_prepare_cpus(unsigned int max_cpus)

arch/arm/kernel/topology.c

@@ -196,32 +196,7 @@ static inline void parse_dt_topology(void) {}
 static inline void update_cpu_power(unsigned int cpuid, unsigned int mpidr) {}
 #endif
 
-
-/*
- * cpu topology management
- */
-
-#define MPIDR_SMP_BITMASK (0x3 << 30)
-#define MPIDR_SMP_VALUE (0x2 << 30)
-
-#define MPIDR_MT_BITMASK (0x1 << 24)
-
-/*
- * These masks reflect the current use of the affinity levels.
- * The affinity level can be up to 16 bits according to ARM ARM
- */
-#define MPIDR_HWID_BITMASK 0xFFFFFF
-
-#define MPIDR_LEVEL0_MASK 0x3
-#define MPIDR_LEVEL0_SHIFT 0
-
-#define MPIDR_LEVEL1_MASK 0xF
-#define MPIDR_LEVEL1_SHIFT 8
-
-#define MPIDR_LEVEL2_MASK 0xFF
-#define MPIDR_LEVEL2_SHIFT 16
-
-/*
+ /*
  * cpu topology table
  */
 struct cputopo_arm cpu_topology[NR_CPUS];
@@ -282,19 +257,14 @@ void store_cpu_topology(unsigned int cpuid)
 
 		if (mpidr & MPIDR_MT_BITMASK) {
 			/* core performance interdependency */
-			cpuid_topo->thread_id = (mpidr >> MPIDR_LEVEL0_SHIFT)
-				& MPIDR_LEVEL0_MASK;
-			cpuid_topo->core_id = (mpidr >> MPIDR_LEVEL1_SHIFT)
-				& MPIDR_LEVEL1_MASK;
-			cpuid_topo->socket_id = (mpidr >> MPIDR_LEVEL2_SHIFT)
-				& MPIDR_LEVEL2_MASK;
+			cpuid_topo->thread_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+			cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+			cpuid_topo->socket_id = MPIDR_AFFINITY_LEVEL(mpidr, 2);
 		} else {
 			/* largely independent cores */
 			cpuid_topo->thread_id = -1;
-			cpuid_topo->core_id = (mpidr >> MPIDR_LEVEL0_SHIFT)
-				& MPIDR_LEVEL0_MASK;
-			cpuid_topo->socket_id = (mpidr >> MPIDR_LEVEL1_SHIFT)
-				& MPIDR_LEVEL1_MASK;
+			cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+			cpuid_topo->socket_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
 		}
 	} else {
 		/*

arch/arm/mach-omap2/pmu.c

@@ -57,8 +57,6 @@ static int __init omap2_init_pmu(unsigned oh_num, char *oh_names[])
 	if (IS_ERR(omap_pmu_dev))
 		return PTR_ERR(omap_pmu_dev);
 
-	pm_runtime_enable(&omap_pmu_dev->dev);
-
 	return 0;
 }
 

arch/arm/mm/context.c

@@ -2,6 +2,9 @@
  *  linux/arch/arm/mm/context.c
  *
  *  Copyright (C) 2002-2003 Deep Blue Solutions Ltd, all rights reserved.
+ *  Copyright (C) 2012 ARM Limited
+ *
+ *  Author: Will Deacon <will.deacon@arm.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -14,14 +17,40 @@
 #include <linux/percpu.h>
 
 #include <asm/mmu_context.h>
+#include <asm/smp_plat.h>
 #include <asm/thread_notify.h>
 #include <asm/tlbflush.h>
 
+/*
+ * On ARMv6, we have the following structure in the Context ID:
+ *
+ * 31                         7          0
+ * +-------------------------+-----------+
+ * |      process ID         |   ASID    |
+ * +-------------------------+-----------+
+ * |              context ID             |
+ * +-------------------------------------+
+ *
+ * The ASID is used to tag entries in the CPU caches and TLBs.
+ * The context ID is used by debuggers and trace logic, and
+ * should be unique within all running processes.
+ */
+#define ASID_FIRST_VERSION	(1ULL << ASID_BITS)
+#define NUM_USER_ASIDS		(ASID_FIRST_VERSION - 1)
+
+#define ASID_TO_IDX(asid)	((asid & ~ASID_MASK) - 1)
+#define IDX_TO_ASID(idx)	((idx + 1) & ~ASID_MASK)
+
 static DEFINE_RAW_SPINLOCK(cpu_asid_lock);
-unsigned int cpu_last_asid = ASID_FIRST_VERSION;
+static atomic64_t asid_generation = ATOMIC64_INIT(ASID_FIRST_VERSION);
+static DECLARE_BITMAP(asid_map, NUM_USER_ASIDS);
+
+static DEFINE_PER_CPU(atomic64_t, active_asids);
+static DEFINE_PER_CPU(u64, reserved_asids);
+static cpumask_t tlb_flush_pending;
 
 #ifdef CONFIG_ARM_LPAE
-void cpu_set_reserved_ttbr0(void)
+static void cpu_set_reserved_ttbr0(void)
 {
 	unsigned long ttbl = __pa(swapper_pg_dir);
 	unsigned long ttbh = 0;
@@ -37,7 +66,7 @@ void cpu_set_reserved_ttbr0(void)
 	isb();
 }
 #else
-void cpu_set_reserved_ttbr0(void)
+static void cpu_set_reserved_ttbr0(void)
 {
 	u32 ttb;
 	/* Copy TTBR1 into TTBR0 */
@@ -84,124 +113,104 @@ static int __init contextidr_notifier_init(void)
 arch_initcall(contextidr_notifier_init);
 #endif
 
-/*
- * We fork()ed a process, and we need a new context for the child
- * to run in.
- */
-void __init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+static void flush_context(unsigned int cpu)
 {
-	mm->context.id = 0;
-	raw_spin_lock_init(&mm->context.id_lock);
-}
+	int i;
+	u64 asid;
+
+	/* Update the list of reserved ASIDs and the ASID bitmap. */
+	bitmap_clear(asid_map, 0, NUM_USER_ASIDS);
+	for_each_possible_cpu(i) {
+		if (i == cpu) {
+			asid = 0;
+		} else {
+			asid = atomic64_xchg(&per_cpu(active_asids, i), 0);
+			__set_bit(ASID_TO_IDX(asid), asid_map);
+		}
+		per_cpu(reserved_asids, i) = asid;
+	}
 
-static void flush_context(void)
-{
-	cpu_set_reserved_ttbr0();
-	local_flush_tlb_all();
-	if (icache_is_vivt_asid_tagged()) {
+	/* Queue a TLB invalidate and flush the I-cache if necessary. */
+	if (!tlb_ops_need_broadcast())
+		cpumask_set_cpu(cpu, &tlb_flush_pending);
+	else
+		cpumask_setall(&tlb_flush_pending);
+
+	if (icache_is_vivt_asid_tagged())
 		__flush_icache_all();
-		dsb();
-	}
 }
 
-#ifdef CONFIG_SMP
+static int is_reserved_asid(u64 asid)
+{
+	int cpu;
+	for_each_possible_cpu(cpu)
+		if (per_cpu(reserved_asids, cpu) == asid)
+			return 1;
+	return 0;
+}
 
-static void set_mm_context(struct mm_struct *mm, unsigned int asid)
+static void new_context(struct mm_struct *mm, unsigned int cpu)
 {
-	unsigned long flags;
+	u64 asid = mm->context.id;
+	u64 generation = atomic64_read(&asid_generation);
 
-	/*
-	 * Locking needed for multi-threaded applications where the
-	 * same mm->context.id could be set from different CPUs during
-	 * the broadcast. This function is also called via IPI so the
-	 * mm->context.id_lock has to be IRQ-safe.
-	 */
-	raw_spin_lock_irqsave(&mm->context.id_lock, flags);
-	if (likely((mm->context.id ^ cpu_last_asid) >> ASID_BITS)) {
+	if (asid != 0 && is_reserved_asid(asid)) {
 		/*
-		 * Old version of ASID found. Set the new one and
-		 * reset mm_cpumask(mm).
+		 * Our current ASID was active during a rollover, we can
+		 * continue to use it and this was just a false alarm.
 		 */
-		mm->context.id = asid;
+		asid = generation | (asid & ~ASID_MASK);
+	} else {
+		/*
+		 * Allocate a free ASID. If we can't find one, take a
+		 * note of the currently active ASIDs and mark the TLBs
+		 * as requiring flushes.
+		 */
+		asid = find_first_zero_bit(asid_map, NUM_USER_ASIDS);
+		if (asid == NUM_USER_ASIDS) {
+			generation = atomic64_add_return(ASID_FIRST_VERSION,
+							 &asid_generation);
+			flush_context(cpu);
+			asid = find_first_zero_bit(asid_map, NUM_USER_ASIDS);
+		}
+		__set_bit(asid, asid_map);
+		asid = generation | IDX_TO_ASID(asid);
 		cpumask_clear(mm_cpumask(mm));
 	}
-	raw_spin_unlock_irqrestore(&mm->context.id_lock, flags);
 
-	/*
-	 * Set the mm_cpumask(mm) bit for the current CPU.
-	 */
-	cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
+	mm->context.id = asid;
 }
 
-/*
- * Reset the ASID on the current CPU. This function call is broadcast
- * from the CPU handling the ASID rollover and holding cpu_asid_lock.
- */
-static void reset_context(void *info)
+void check_and_switch_context(struct mm_struct *mm, struct task_struct *tsk)
 {
-	unsigned int asid;
+	unsigned long flags;
 	unsigned int cpu = smp_processor_id();
-	struct mm_struct *mm = current->active_mm;
 
-	smp_rmb();
-	asid = cpu_last_asid + cpu + 1;
+	if (unlikely(mm->context.vmalloc_seq != init_mm.context.vmalloc_seq))
+		__check_vmalloc_seq(mm);
 
-	flush_context();
-	set_mm_context(mm, asid);
-
-	/* set the new ASID */
-	cpu_switch_mm(mm->pgd, mm);
-}
+	/*
+	 * Required during context switch to avoid speculative page table
+	 * walking with the wrong TTBR.
+	 */
+	cpu_set_reserved_ttbr0();
 
-#else
+	if (!((mm->context.id ^ atomic64_read(&asid_generation)) >> ASID_BITS)
+	    && atomic64_xchg(&per_cpu(active_asids, cpu), mm->context.id))
+		goto switch_mm_fastpath;
 
-static inline void set_mm_context(struct mm_struct *mm, unsigned int asid)
-{
-	mm->context.id = asid;
-	cpumask_copy(mm_cpumask(mm), cpumask_of(smp_processor_id()));
-}
+	raw_spin_lock_irqsave(&cpu_asid_lock, flags);
+	/* Check that our ASID belongs to the current generation. */
+	if ((mm->context.id ^ atomic64_read(&asid_generation)) >> ASID_BITS)
+		new_context(mm, cpu);
 
-#endif
+	atomic64_set(&per_cpu(active_asids, cpu), mm->context.id);
+	cpumask_set_cpu(cpu, mm_cpumask(mm));
 
-void __new_context(struct mm_struct *mm)
-{
-	unsigned int asid;
+	if (cpumask_test_and_clear_cpu(cpu, &tlb_flush_pending))
+		local_flush_tlb_all();
+	raw_spin_unlock_irqrestore(&cpu_asid_lock, flags);
 
-	raw_spin_lock(&cpu_asid_lock);
-#ifdef CONFIG_SMP
-	/*
-	 * Check the ASID again, in case the change was broadcast from
-	 * another CPU before we acquired the lock.
-	 */
-	if (unlikely(((mm->context.id ^ cpu_last_asid) >> ASID_BITS) == 0)) {
-		cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
-		raw_spin_unlock(&cpu_asid_lock);
-		return;
-	}
-#endif
-	/*
-	 * At this point, it is guaranteed that the current mm (with
-	 * an old ASID) isn't active on any other CPU since the ASIDs
-	 * are changed simultaneously via IPI.
-	 */
-	asid = ++cpu_last_asid;
-	if (asid == 0)
-		asid = cpu_last_asid = ASID_FIRST_VERSION;
-
-	/*
-	 * If we've used up all our ASIDs, we need
-	 * to start a new version and flush the TLB.
-	 */
-	if (unlikely((asid & ~ASID_MASK) == 0)) {
-		asid = cpu_last_asid + smp_processor_id() + 1;
-		flush_context();
-#ifdef CONFIG_SMP
-		smp_wmb();
-		smp_call_function(reset_context, NULL, 1);
-#endif
-		cpu_last_asid += NR_CPUS;
-	}
-
-	set_mm_context(mm, asid);
-	raw_spin_unlock(&cpu_asid_lock);
+switch_mm_fastpath:
+	cpu_switch_mm(mm->pgd, mm);
 }

arch/arm/mm/ioremap.c

@@ -47,18 +47,18 @@ int ioremap_page(unsigned long virt, unsigned long phys,
 }
 EXPORT_SYMBOL(ioremap_page);
 
-void __check_kvm_seq(struct mm_struct *mm)
+void __check_vmalloc_seq(struct mm_struct *mm)
 {
 	unsigned int seq;
 
 	do {
-		seq = init_mm.context.kvm_seq;
+		seq = init_mm.context.vmalloc_seq;
 		memcpy(pgd_offset(mm, VMALLOC_START),
 		       pgd_offset_k(VMALLOC_START),
 		       sizeof(pgd_t) * (pgd_index(VMALLOC_END) -
 					pgd_index(VMALLOC_START)));
-		mm->context.kvm_seq = seq;
-	} while (seq != init_mm.context.kvm_seq);
+		mm->context.vmalloc_seq = seq;
+	} while (seq != init_mm.context.vmalloc_seq);
 }
 
 #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
@@ -89,13 +89,13 @@ static void unmap_area_sections(unsigned long virt, unsigned long size)
 		if (!pmd_none(pmd)) {
 			/*
 			 * Clear the PMD from the page table, and
-			 * increment the kvm sequence so others
+			 * increment the vmalloc sequence so others
 			 * notice this change.
 			 *
 			 * Note: this is still racy on SMP machines.
 			 */
 			pmd_clear(pmdp);
-			init_mm.context.kvm_seq++;
+			init_mm.context.vmalloc_seq++;
 
 			/*
 			 * Free the page table, if there was one.
@@ -112,8 +112,8 @@ static void unmap_area_sections(unsigned long virt, unsigned long size)
 	 * Ensure that the active_mm is up to date - we want to
 	 * catch any use-after-iounmap cases.
 	 */
-	if (current->active_mm->context.kvm_seq != init_mm.context.kvm_seq)
-		__check_kvm_seq(current->active_mm);
+	if (current->active_mm->context.vmalloc_seq != init_mm.context.vmalloc_seq)
+		__check_vmalloc_seq(current->active_mm);
 
 	flush_tlb_kernel_range(virt, end);
 }

arch/arm/mm/mmu.c

@@ -488,7 +488,7 @@ static void __init build_mem_type_table(void)
 #endif
 
 	for (i = 0; i < 16; i++) {
-		unsigned long v = pgprot_val(protection_map[i]);
+		pteval_t v = pgprot_val(protection_map[i]);
 		protection_map[i] = __pgprot(v | user_pgprot);
 	}
 

arch/arm/mm/proc-macros.S

@@ -167,6 +167,10 @@
 	tst	r1, #L_PTE_YOUNG
 	tstne	r1, #L_PTE_PRESENT
 	moveq	r3, #0
+#ifndef CONFIG_CPU_USE_DOMAINS
+	tstne	r1, #L_PTE_NONE
+	movne	r3, #0
+#endif
 
 	str	r3, [r0]
 	mcr	p15, 0, r0, c7, c10, 1		@ flush_pte

arch/arm/mm/proc-v7-2level.S

@@ -100,7 +100,11 @@ ENTRY(cpu_v7_set_pte_ext)
 	orrne	r3, r3, #PTE_EXT_XN
 
 	tst	r1, #L_PTE_YOUNG
-	tstne	r1, #L_PTE_PRESENT
+	tstne	r1, #L_PTE_VALID
+#ifndef CONFIG_CPU_USE_DOMAINS
+	eorne	r1, r1, #L_PTE_NONE
+	tstne	r1, #L_PTE_NONE
+#endif
 	moveq	r3, #0
 
  ARM(	str	r3, [r0, #2048]! )
@@ -161,11 +165,11 @@ ENDPROC(cpu_v7_set_pte_ext)
 	 *  TFR   EV X F   I D LR    S
 	 * .EEE ..EE PUI. .T.T 4RVI ZWRS BLDP WCAM
 	 * rxxx rrxx xxx0 0101 xxxx xxxx x111 xxxx < forced
-	 *    1    0 110       0011 1100 .111 1101 < we want
+	 *   01    0 110       0011 1100 .111 1101 < we want
 	 */
 	.align	2
 	.type	v7_crval, #object
 v7_crval:
-	crval	clear=0x0120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c
+	crval	clear=0x2120c302, mmuset=0x10c03c7d, ucset=0x00c01c7c
 
 	.previous

arch/arm/mm/proc-v7-3level.S

@@ -65,8 +65,11 @@ ENDPROC(cpu_v7_switch_mm)
  */
 ENTRY(cpu_v7_set_pte_ext)
 #ifdef CONFIG_MMU
-	tst	r2, #L_PTE_PRESENT
+	tst	r2, #L_PTE_VALID
 	beq	1f
+	tst	r3, #1 << (57 - 32)		@ L_PTE_NONE
+	bicne	r2, #L_PTE_VALID
+	bne	1f
 	tst	r3, #1 << (55 - 32)		@ L_PTE_DIRTY
 	orreq	r2, #L_PTE_RDONLY
 1:	strd	r2, r3, [r0]