diff options
Diffstat (limited to 'arch/xtensa')
25 files changed, 1191 insertions, 541 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index e5b872ba2484..3bd3504a6cc7 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -14,12 +14,15 @@ config XTENSA select GENERIC_IRQ_SHOW select GENERIC_PCI_IOMAP select GENERIC_SCHED_CLOCK + select HAVE_DMA_API_DEBUG + select HAVE_DMA_ATTRS select HAVE_FUNCTION_TRACER select HAVE_IRQ_TIME_ACCOUNTING select HAVE_OPROFILE select HAVE_PERF_EVENTS select IRQ_DOMAIN select MODULES_USE_ELF_RELA + select PERF_USE_VMALLOC select VIRT_TO_BUS help Xtensa processors are 32-bit RISC machines designed by Tensilica @@ -61,9 +64,7 @@ config TRACE_IRQFLAGS_SUPPORT def_bool y config MMU - bool - default n if !XTENSA_VARIANT_CUSTOM - default XTENSA_VARIANT_MMU if XTENSA_VARIANT_CUSTOM + def_bool n config VARIANT_IRQ_SWITCH def_bool n @@ -71,9 +72,6 @@ config VARIANT_IRQ_SWITCH config HAVE_XTENSA_GPIO32 def_bool n -config MAY_HAVE_SMP - def_bool n - menu "Processor type and features" choice @@ -100,7 +98,6 @@ config XTENSA_VARIANT_DC233C config XTENSA_VARIANT_CUSTOM bool "Custom Xtensa processor configuration" - select MAY_HAVE_SMP select HAVE_XTENSA_GPIO32 help Select this variant to use a custom Xtensa processor configuration. @@ -126,10 +123,21 @@ config XTENSA_VARIANT_MMU bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)" depends on XTENSA_VARIANT_CUSTOM default y + select MMU help Build a Conventional Kernel with full MMU support, ie: it supports a TLB with auto-loading, page protection. +config XTENSA_VARIANT_HAVE_PERF_EVENTS + bool "Core variant has Performance Monitor Module" + depends on XTENSA_VARIANT_CUSTOM + default n + help + Enable if core variant has Performance Monitor Module with + External Registers Interface. + + If unsure, say N. + config XTENSA_UNALIGNED_USER bool "Unaligned memory access in use space" help @@ -143,7 +151,7 @@ source "kernel/Kconfig.preempt" config HAVE_SMP bool "System Supports SMP (MX)" - depends on MAY_HAVE_SMP + depends on XTENSA_VARIANT_CUSTOM select XTENSA_MX help This option is use to indicate that the system-on-a-chip (SOC) diff --git a/arch/xtensa/configs/iss_defconfig b/arch/xtensa/configs/iss_defconfig index e4d193e7a300..f3dfe0d921c2 100644 --- a/arch/xtensa/configs/iss_defconfig +++ b/arch/xtensa/configs/iss_defconfig @@ -616,7 +616,6 @@ CONFIG_SCHED_DEBUG=y # CONFIG_SLUB_DEBUG_ON is not set # CONFIG_SLUB_STATS is not set # CONFIG_DEBUG_RT_MUTEXES is not set -# CONFIG_RT_MUTEX_TESTER is not set # CONFIG_DEBUG_SPINLOCK is not set # CONFIG_DEBUG_MUTEXES is not set # CONFIG_DEBUG_SPINLOCK_SLEEP is not set diff --git a/arch/xtensa/include/asm/Kbuild b/arch/xtensa/include/asm/Kbuild index 5b478accd5fc..63c223dff5f1 100644 --- a/arch/xtensa/include/asm/Kbuild +++ b/arch/xtensa/include/asm/Kbuild @@ -2,7 +2,6 @@ generic-y += bitsperlong.h generic-y += bug.h generic-y += clkdev.h generic-y += cputime.h -generic-y += device.h generic-y += div64.h generic-y += emergency-restart.h generic-y += errno.h diff --git a/arch/xtensa/include/asm/atomic.h b/arch/xtensa/include/asm/atomic.h index 00b7d46b35b8..93795d047303 100644 --- a/arch/xtensa/include/asm/atomic.h +++ b/arch/xtensa/include/asm/atomic.h @@ -29,7 +29,7 @@ * * Locking interrupts looks like this: * - * rsil a15, LOCKLEVEL + * rsil a15, TOPLEVEL * <code> * wsr a15, PS * rsync @@ -106,7 +106,7 @@ static inline void atomic_##op(int i, atomic_t * v) \ unsigned int vval; \ \ __asm__ __volatile__( \ - " rsil a15, "__stringify(LOCKLEVEL)"\n"\ + " rsil a15, "__stringify(TOPLEVEL)"\n"\ " l32i %0, %2, 0\n" \ " " #op " %0, %0, %1\n" \ " s32i %0, %2, 0\n" \ @@ -124,7 +124,7 @@ static inline int atomic_##op##_return(int i, atomic_t * v) \ unsigned int vval; \ \ __asm__ __volatile__( \ - " rsil a15,"__stringify(LOCKLEVEL)"\n" \ + " rsil a15,"__stringify(TOPLEVEL)"\n" \ " l32i %0, %2, 0\n" \ " " #op " %0, %0, %1\n" \ " s32i %0, %2, 0\n" \ @@ -145,6 +145,10 @@ static inline int atomic_##op##_return(int i, atomic_t * v) \ ATOMIC_OPS(add) ATOMIC_OPS(sub) +ATOMIC_OP(and) +ATOMIC_OP(or) +ATOMIC_OP(xor) + #undef ATOMIC_OPS #undef ATOMIC_OP_RETURN #undef ATOMIC_OP @@ -250,75 +254,6 @@ static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u) return c; } - -static inline void atomic_clear_mask(unsigned int mask, atomic_t *v) -{ -#if XCHAL_HAVE_S32C1I - unsigned long tmp; - int result; - - __asm__ __volatile__( - "1: l32i %1, %3, 0\n" - " wsr %1, scompare1\n" - " and %0, %1, %2\n" - " s32c1i %0, %3, 0\n" - " bne %0, %1, 1b\n" - : "=&a" (result), "=&a" (tmp) - : "a" (~mask), "a" (v) - : "memory" - ); -#else - unsigned int all_f = -1; - unsigned int vval; - - __asm__ __volatile__( - " rsil a15,"__stringify(LOCKLEVEL)"\n" - " l32i %0, %2, 0\n" - " xor %1, %4, %3\n" - " and %0, %0, %4\n" - " s32i %0, %2, 0\n" - " wsr a15, ps\n" - " rsync\n" - : "=&a" (vval), "=a" (mask) - : "a" (v), "a" (all_f), "1" (mask) - : "a15", "memory" - ); -#endif -} - -static inline void atomic_set_mask(unsigned int mask, atomic_t *v) -{ -#if XCHAL_HAVE_S32C1I - unsigned long tmp; - int result; - - __asm__ __volatile__( - "1: l32i %1, %3, 0\n" - " wsr %1, scompare1\n" - " or %0, %1, %2\n" - " s32c1i %0, %3, 0\n" - " bne %0, %1, 1b\n" - : "=&a" (result), "=&a" (tmp) - : "a" (mask), "a" (v) - : "memory" - ); -#else - unsigned int vval; - - __asm__ __volatile__( - " rsil a15,"__stringify(LOCKLEVEL)"\n" - " l32i %0, %2, 0\n" - " or %0, %0, %1\n" - " s32i %0, %2, 0\n" - " wsr a15, ps\n" - " rsync\n" - : "=&a" (vval) - : "a" (mask), "a" (v) - : "a15", "memory" - ); -#endif -} - #endif /* __KERNEL__ */ #endif /* _XTENSA_ATOMIC_H */ diff --git a/arch/xtensa/include/asm/cmpxchg.h b/arch/xtensa/include/asm/cmpxchg.h index 370b26f38414..201e9009efd8 100644 --- a/arch/xtensa/include/asm/cmpxchg.h +++ b/arch/xtensa/include/asm/cmpxchg.h @@ -34,7 +34,7 @@ __cmpxchg_u32(volatile int *p, int old, int new) return new; #else __asm__ __volatile__( - " rsil a15, "__stringify(LOCKLEVEL)"\n" + " rsil a15, "__stringify(TOPLEVEL)"\n" " l32i %0, %1, 0\n" " bne %0, %2, 1f\n" " s32i %3, %1, 0\n" @@ -123,7 +123,7 @@ static inline unsigned long xchg_u32(volatile int * m, unsigned long val) #else unsigned long tmp; __asm__ __volatile__( - " rsil a15, "__stringify(LOCKLEVEL)"\n" + " rsil a15, "__stringify(TOPLEVEL)"\n" " l32i %0, %1, 0\n" " s32i %2, %1, 0\n" " wsr a15, ps\n" diff --git a/arch/xtensa/include/asm/device.h b/arch/xtensa/include/asm/device.h new file mode 100644 index 000000000000..fe1f5c878493 --- /dev/null +++ b/arch/xtensa/include/asm/device.h @@ -0,0 +1,19 @@ +/* + * Arch specific extensions to struct device + * + * This file is released under the GPLv2 + */ +#ifndef _ASM_XTENSA_DEVICE_H +#define _ASM_XTENSA_DEVICE_H + +struct dma_map_ops; + +struct dev_archdata { + /* DMA operations on that device */ + struct dma_map_ops *dma_ops; +}; + +struct pdev_archdata { +}; + +#endif /* _ASM_XTENSA_DEVICE_H */ diff --git a/arch/xtensa/include/asm/dma-mapping.h b/arch/xtensa/include/asm/dma-mapping.h index 1f5f6dc09736..f01cb3044e50 100644 --- a/arch/xtensa/include/asm/dma-mapping.h +++ b/arch/xtensa/include/asm/dma-mapping.h @@ -1,11 +1,10 @@ /* - * include/asm-xtensa/dma-mapping.h - * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2003 - 2005 Tensilica Inc. + * Copyright (C) 2015 Cadence Design Systems Inc. */ #ifndef _XTENSA_DMA_MAPPING_H @@ -13,142 +12,67 @@ #include <asm/cache.h> #include <asm/io.h> + +#include <asm-generic/dma-coherent.h> + #include <linux/mm.h> #include <linux/scatterlist.h> #define DMA_ERROR_CODE (~(dma_addr_t)0x0) -/* - * DMA-consistent mapping functions. - */ - -extern void *consistent_alloc(int, size_t, dma_addr_t, unsigned long); -extern void consistent_free(void*, size_t, dma_addr_t); -extern void consistent_sync(void*, size_t, int); - -#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) -#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) - -void *dma_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag); +extern struct dma_map_ops xtensa_dma_map_ops; -void dma_free_coherent(struct device *dev, size_t size, - void *vaddr, dma_addr_t dma_handle); - -static inline dma_addr_t -dma_map_single(struct device *dev, void *ptr, size_t size, - enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); - consistent_sync(ptr, size, direction); - return virt_to_phys(ptr); -} - -static inline void -dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, - enum dma_data_direction direction) +static inline struct dma_map_ops *get_dma_ops(struct device *dev) { - BUG_ON(direction == DMA_NONE); + if (dev && dev->archdata.dma_ops) + return dev->archdata.dma_ops; + else + return &xtensa_dma_map_ops; } -static inline int -dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, - enum dma_data_direction direction) -{ - int i; - struct scatterlist *sg; - - BUG_ON(direction == DMA_NONE); - - for_each_sg(sglist, sg, nents, i) { - BUG_ON(!sg_page(sg)); +#include <asm-generic/dma-mapping-common.h> - sg->dma_address = sg_phys(sg); - consistent_sync(sg_virt(sg), sg->length, direction); - } +#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL) +#define dma_free_noncoherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL) +#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL) +#define dma_free_coherent(d, s, c, h) dma_free_attrs(d, s, c, h, NULL) - return nents; -} - -static inline dma_addr_t -dma_map_page(struct device *dev, struct page *page, unsigned long offset, - size_t size, enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); - return (dma_addr_t)(page_to_pfn(page)) * PAGE_SIZE + offset; -} - -static inline void -dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, - enum dma_data_direction direction) +static inline void *dma_alloc_attrs(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp, + struct dma_attrs *attrs) { - BUG_ON(direction == DMA_NONE); -} + void *ret; + struct dma_map_ops *ops = get_dma_ops(dev); + if (dma_alloc_from_coherent(dev, size, dma_handle, &ret)) + return ret; -static inline void -dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, - enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); -} - -static inline void -dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, - enum dma_data_direction direction) -{ - consistent_sync((void *)bus_to_virt(dma_handle), size, direction); -} + ret = ops->alloc(dev, size, dma_handle, gfp, attrs); + debug_dma_alloc_coherent(dev, size, *dma_handle, ret); -static inline void -dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, - size_t size, enum dma_data_direction direction) -{ - consistent_sync((void *)bus_to_virt(dma_handle), size, direction); + return ret; } -static inline void -dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, - unsigned long offset, size_t size, - enum dma_data_direction direction) -{ - - consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction); -} - -static inline void -dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, - unsigned long offset, size_t size, - enum dma_data_direction direction) +static inline void dma_free_attrs(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle, + struct dma_attrs *attrs) { + struct dma_map_ops *ops = get_dma_ops(dev); - consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction); -} -static inline void -dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nelems, - enum dma_data_direction dir) -{ - int i; - struct scatterlist *sg; + if (dma_release_from_coherent(dev, get_order(size), vaddr)) + return; - for_each_sg(sglist, sg, nelems, i) - consistent_sync(sg_virt(sg), sg->length, dir); + ops->free(dev, size, vaddr, dma_handle, attrs); + debug_dma_free_coherent(dev, size, vaddr, dma_handle); } -static inline void -dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, - int nelems, enum dma_data_direction dir) -{ - int i; - struct scatterlist *sg; - - for_each_sg(sglist, sg, nelems, i) - consistent_sync(sg_virt(sg), sg->length, dir); -} static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) { - return 0; + struct dma_map_ops *ops = get_dma_ops(dev); + + debug_dma_mapping_error(dev, dma_addr); + return ops->mapping_error(dev, dma_addr); } static inline int @@ -168,39 +92,7 @@ dma_set_mask(struct device *dev, u64 mask) return 0; } -static inline void -dma_cache_sync(struct device *dev, void *vaddr, size_t size, - enum dma_data_direction direction) -{ - consistent_sync(vaddr, size, direction); -} - -/* Not supported for now */ -static inline int dma_mmap_coherent(struct device *dev, - struct vm_area_struct *vma, void *cpu_addr, - dma_addr_t dma_addr, size_t size) -{ - return -EINVAL; -} - -static inline int dma_get_sgtable(struct device *dev, struct sg_table *sgt, - void *cpu_addr, dma_addr_t dma_addr, - size_t size) -{ - return -EINVAL; -} - -static inline void *dma_alloc_attrs(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag, - struct dma_attrs *attrs) -{ - return NULL; -} - -static inline void dma_free_attrs(struct device *dev, size_t size, - void *vaddr, dma_addr_t dma_handle, - struct dma_attrs *attrs) -{ -} +void dma_cache_sync(struct device *dev, void *vaddr, size_t size, + enum dma_data_direction direction); #endif /* _XTENSA_DMA_MAPPING_H */ diff --git a/arch/xtensa/include/asm/irqflags.h b/arch/xtensa/include/asm/irqflags.h index ea36674c6ec5..8e090c709046 100644 --- a/arch/xtensa/include/asm/irqflags.h +++ b/arch/xtensa/include/asm/irqflags.h @@ -6,6 +6,7 @@ * for more details. * * Copyright (C) 2001 - 2005 Tensilica Inc. + * Copyright (C) 2015 Cadence Design Systems Inc. */ #ifndef _XTENSA_IRQFLAGS_H @@ -23,8 +24,27 @@ static inline unsigned long arch_local_save_flags(void) static inline unsigned long arch_local_irq_save(void) { unsigned long flags; - asm volatile("rsil %0, "__stringify(LOCKLEVEL) +#if XTENSA_FAKE_NMI +#if defined(CONFIG_DEBUG_KERNEL) && (LOCKLEVEL | TOPLEVEL) >= XCHAL_DEBUGLEVEL + unsigned long tmp; + + asm volatile("rsr %0, ps\t\n" + "extui %1, %0, 0, 4\t\n" + "bgei %1, "__stringify(LOCKLEVEL)", 1f\t\n" + "rsil %0, "__stringify(LOCKLEVEL)"\n" + "1:" + : "=a" (flags), "=a" (tmp) :: "memory"); +#else + asm volatile("rsr %0, ps\t\n" + "or %0, %0, %1\t\n" + "xsr %0, ps\t\n" + "rsync" + : "=&a" (flags) : "a" (LOCKLEVEL) : "memory"); +#endif +#else + asm volatile("rsil %0, "__stringify(LOCKLEVEL) : "=a" (flags) :: "memory"); +#endif return flags; } diff --git a/arch/xtensa/include/asm/processor.h b/arch/xtensa/include/asm/processor.h index b61bdf0eea25..83e2e4bc01ba 100644 --- a/arch/xtensa/include/asm/processor.h +++ b/arch/xtensa/include/asm/processor.h @@ -1,11 +1,10 @@ /* - * include/asm-xtensa/processor.h - * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2001 - 2008 Tensilica Inc. + * Copyright (C) 2015 Cadence Design Systems Inc. */ #ifndef _XTENSA_PROCESSOR_H @@ -45,6 +44,14 @@ #define STACK_TOP_MAX STACK_TOP /* + * General exception cause assigned to fake NMI. Fake NMI needs to be handled + * differently from other interrupts, but it uses common kernel entry/exit + * code. + */ + +#define EXCCAUSE_MAPPED_NMI 62 + +/* * General exception cause assigned to debug exceptions. Debug exceptions go * to their own vector, rather than the general exception vectors (user, * kernel, double); and their specific causes are reported via DEBUGCAUSE @@ -65,10 +72,30 @@ #define VALID_DOUBLE_EXCEPTION_ADDRESS 64 +#define XTENSA_INT_LEVEL(intno) _XTENSA_INT_LEVEL(intno) +#define _XTENSA_INT_LEVEL(intno) XCHAL_INT##intno##_LEVEL + +#define XTENSA_INTLEVEL_MASK(level) _XTENSA_INTLEVEL_MASK(level) +#define _XTENSA_INTLEVEL_MASK(level) (XCHAL_INTLEVEL##level##_MASK) + +#define IS_POW2(v) (((v) & ((v) - 1)) == 0) + +#define PROFILING_INTLEVEL XTENSA_INT_LEVEL(XCHAL_PROFILING_INTERRUPT) + /* LOCKLEVEL defines the interrupt level that masks all * general-purpose interrupts. */ +#if defined(CONFIG_XTENSA_VARIANT_HAVE_PERF_EVENTS) && \ + defined(XCHAL_PROFILING_INTERRUPT) && \ + PROFILING_INTLEVEL == XCHAL_EXCM_LEVEL && \ + XCHAL_EXCM_LEVEL > 1 && \ + IS_POW2(XTENSA_INTLEVEL_MASK(PROFILING_INTLEVEL)) +#define LOCKLEVEL (XCHAL_EXCM_LEVEL - 1) +#else #define LOCKLEVEL XCHAL_EXCM_LEVEL +#endif +#define TOPLEVEL XCHAL_EXCM_LEVEL +#define XTENSA_FAKE_NMI (LOCKLEVEL < TOPLEVEL) /* WSBITS and WBBITS are the width of the WINDOWSTART and WINDOWBASE * registers diff --git a/arch/xtensa/include/asm/stacktrace.h b/arch/xtensa/include/asm/stacktrace.h index 6a05fcb0a20d..fe06e8ed162b 100644 --- a/arch/xtensa/include/asm/stacktrace.h +++ b/arch/xtensa/include/asm/stacktrace.h @@ -33,4 +33,12 @@ void walk_stackframe(unsigned long *sp, int (*fn)(struct stackframe *frame, void *data), void *data); +void xtensa_backtrace_kernel(struct pt_regs *regs, unsigned int depth, + int (*kfn)(struct stackframe *frame, void *data), + int (*ufn)(struct stackframe *frame, void *data), + void *data); +void xtensa_backtrace_user(struct pt_regs *regs, unsigned int depth, + int (*ufn)(struct stackframe *frame, void *data), + void *data); + #endif /* _XTENSA_STACKTRACE_H */ diff --git a/arch/xtensa/include/asm/traps.h b/arch/xtensa/include/asm/traps.h index 677bfcf4ee5d..28f33a8b7f5f 100644 --- a/arch/xtensa/include/asm/traps.h +++ b/arch/xtensa/include/asm/traps.h @@ -25,30 +25,39 @@ static inline void spill_registers(void) { #if XCHAL_NUM_AREGS > 16 __asm__ __volatile__ ( - " call12 1f\n" + " call8 1f\n" " _j 2f\n" " retw\n" " .align 4\n" "1:\n" +#if XCHAL_NUM_AREGS == 32 + " _entry a1, 32\n" + " addi a8, a0, 3\n" + " _entry a1, 16\n" + " mov a12, a12\n" + " retw\n" +#else " _entry a1, 48\n" - " addi a12, a0, 3\n" -#if XCHAL_NUM_AREGS > 32 - " .rept (" __stringify(XCHAL_NUM_AREGS) " - 32) / 12\n" + " call12 1f\n" + " retw\n" + " .align 4\n" + "1:\n" + " .rept (" __stringify(XCHAL_NUM_AREGS) " - 16) / 12\n" " _entry a1, 48\n" " mov a12, a0\n" " .endr\n" -#endif - " _entry a1, 48\n" + " _entry a1, 16\n" #if XCHAL_NUM_AREGS % 12 == 0 - " mov a8, a8\n" -#elif XCHAL_NUM_AREGS % 12 == 4 " mov a12, a12\n" -#elif XCHAL_NUM_AREGS % 12 == 8 +#elif XCHAL_NUM_AREGS % 12 == 4 " mov a4, a4\n" +#elif XCHAL_NUM_AREGS % 12 == 8 + " mov a8, a8\n" #endif " retw\n" +#endif "2:\n" - : : : "a12", "a13", "memory"); + : : : "a8", "a9", "memory"); #else __asm__ __volatile__ ( " mov a12, a12\n" diff --git a/arch/xtensa/kernel/Makefile b/arch/xtensa/kernel/Makefile index d3a0f0fd56dd..50137bc9e150 100644 --- a/arch/xtensa/kernel/Makefile +++ b/arch/xtensa/kernel/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_PCI) += pci.o obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o obj-$(CONFIG_FUNCTION_TRACER) += mcount.o obj-$(CONFIG_SMP) += smp.o mxhead.o +obj-$(CONFIG_XTENSA_VARIANT_HAVE_PERF_EVENTS) += perf_event.o AFLAGS_head.o += -mtext-section-literals @@ -27,10 +28,11 @@ AFLAGS_head.o += -mtext-section-literals # # Replicate rules in scripts/Makefile.build -sed-y = -e 's/\*(\(\.[a-z]*it\|\.ref\|\)\.text)/*(\1.literal \1.text)/g' \ - -e 's/\.text\.unlikely/.literal.unlikely .text.unlikely/g' \ - -e 's/\*(\(\.text .*\))/*(.literal \1)/g' \ - -e 's/\*(\(\.text\.[a-z]*\))/*(\1.literal \1)/g' +sed-y = -e ':a; s/\*(\([^)]*\)\.text\.unlikely/*(\1.literal.unlikely .{text}.unlikely/; ta; ' \ + -e ':b; s/\*(\([^)]*\)\.text\(\.[a-z]*\)/*(\1.{text}\2.literal .{text}\2/; tb; ' \ + -e ':c; s/\*(\([^)]*\)\(\.[a-z]*it\|\.ref\)\.text/*(\1\2.literal \2.{text}/; tc; ' \ + -e ':d; s/\*(\([^)]\+ \|\)\.text/*(\1.literal .{text}/; td; ' \ + -e 's/\.{text}/.text/g' quiet_cmd__cpp_lds_S = LDS $@ cmd__cpp_lds_S = $(CPP) $(cpp_flags) -P -C -Uxtensa -D__ASSEMBLY__ $< \ diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index 82bbfa5a05b3..504130357597 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -1,6 +1,4 @@ /* - * arch/xtensa/kernel/entry.S - * * Low-level exception handling * * This file is subject to the terms and conditions of the GNU General Public @@ -8,6 +6,7 @@ * for more details. * * Copyright (C) 2004 - 2008 by Tensilica Inc. + * Copyright (C) 2015 Cadence Design Systems Inc. * * Chris Zankel <chris@zankel.net> * @@ -75,6 +74,27 @@ #endif .endm + + .macro irq_save flags tmp +#if XTENSA_FAKE_NMI +#if defined(CONFIG_DEBUG_KERNEL) && (LOCKLEVEL | TOPLEVEL) >= XCHAL_DEBUGLEVEL + rsr \flags, ps + extui \tmp, \flags, PS_INTLEVEL_SHIFT, PS_INTLEVEL_WIDTH + bgei \tmp, LOCKLEVEL, 99f + rsil \tmp, LOCKLEVEL +99: +#else + movi \tmp, LOCKLEVEL + rsr \flags, ps + or \flags, \flags, \tmp + xsr \flags, ps + rsync +#endif +#else + rsil \flags, LOCKLEVEL +#endif + .endm + /* ----------------- DEFAULT FIRST LEVEL EXCEPTION HANDLERS ----------------- */ /* @@ -122,6 +142,7 @@ _user_exception: /* Save SAR and turn off single stepping */ movi a2, 0 + wsr a2, depc # terminate user stack trace with 0 rsr a3, sar xsr a2, icountlevel s32i a3, a1, PT_SAR @@ -301,7 +322,18 @@ _kernel_exception: s32i a14, a1, PT_AREG14 s32i a15, a1, PT_AREG15 + _bnei a2, 1, 1f + + /* Copy spill slots of a0 and a1 to imitate movsp + * in order to keep exception stack continuous + */ + l32i a3, a1, PT_SIZE + l32i a0, a1, PT_SIZE + 4 + s32e a3, a1, -16 + s32e a0, a1, -12 1: + l32i a0, a1, PT_AREG0 # restore saved a0 + wsr a0, depc #ifdef KERNEL_STACK_OVERFLOW_CHECK @@ -340,75 +372,88 @@ common_exception: /* It is now save to restore the EXC_TABLE_FIXUP variable. */ - rsr a0, exccause + rsr a2, exccause movi a3, 0 - rsr a2, excsave1 - s32i a0, a1, PT_EXCCAUSE - s32i a3, a2, EXC_TABLE_FIXUP - - /* All unrecoverable states are saved on stack, now, and a1 is valid, - * so we can allow exceptions and interrupts (*) again. - * Set PS(EXCM = 0, UM = 0, RING = 0, OWB = 0, WOE = 1, INTLEVEL = X) + rsr a0, excsave1 + s32i a2, a1, PT_EXCCAUSE + s32i a3, a0, EXC_TABLE_FIXUP + + /* All unrecoverable states are saved on stack, now, and a1 is valid. + * Now we can allow exceptions again. In case we've got an interrupt + * PS.INTLEVEL is set to LOCKLEVEL disabling furhter interrupts, + * otherwise it's left unchanged. * - * (*) We only allow interrupts if they were previously enabled and - * we're not handling an IRQ + * Set PS(EXCM = 0, UM = 0, RING = 0, OWB = 0, WOE = 1, INTLEVEL = X) */ rsr a3, ps - addi a0, a0, -EXCCAUSE_LEVEL1_INTERRUPT - movi a2, LOCKLEVEL + s32i a3, a1, PT_PS # save ps + +#if XTENSA_FAKE_NMI + /* Correct PS needs to be saved in the PT_PS: + * - in case of exception or level-1 interrupt it's in the PS, + * and is already saved. + * - in case of medium level interrupt it's in the excsave2. + */ + movi a0, EXCCAUSE_MAPPED_NMI + extui a3, a3, PS_INTLEVEL_SHIFT, PS_INTLEVEL_WIDTH + beq a2, a0, .Lmedium_level_irq + bnei a2, EXCCAUSE_LEVEL1_INTERRUPT, .Lexception + beqz a3, .Llevel1_irq # level-1 IRQ sets ps.intlevel to 0 + +.Lmedium_level_irq: + rsr a0, excsave2 + s32i a0, a1, PT_PS # save medium-level interrupt ps + bgei a3, LOCKLEVEL, .Lexception + +.Llevel1_irq: + movi a3, LOCKLEVEL + +.Lexception: + movi a0, 1 << PS_WOE_BIT + or a3, a3, a0 +#else + addi a2, a2, -EXCCAUSE_LEVEL1_INTERRUPT + movi a0, LOCKLEVEL extui a3, a3, PS_INTLEVEL_SHIFT, PS_INTLEVEL_WIDTH # a3 = PS.INTLEVEL - moveqz a3, a2, a0 # a3 = LOCKLEVEL iff interrupt + moveqz a3, a0, a2 # a3 = LOCKLEVEL iff interrupt movi a2, 1 << PS_WOE_BIT or a3, a3, a2 - rsr a0, exccause - xsr a3, ps + rsr a2, exccause +#endif - s32i a3, a1, PT_PS # save ps + /* restore return address (or 0 if return to userspace) */ + rsr a0, depc + wsr a3, ps + rsync # PS.WOE => rsync => overflow /* Save lbeg, lend */ - rsr a2, lbeg + rsr a4, lbeg rsr a3, lend - s32i a2, a1, PT_LBEG + s32i a4, a1, PT_LBEG s32i a3, a1, PT_LEND /* Save SCOMPARE1 */ #if XCHAL_HAVE_S32C1I - rsr a2, scompare1 - s32i a2, a1, PT_SCOMPARE1 + rsr a3, scompare1 + s32i a3, a1, PT_SCOMPARE1 #endif /* Save optional registers. */ - save_xtregs_opt a1 a2 a4 a5 a6 a7 PT_XTREGS_OPT + save_xtregs_opt a1 a3 a4 a5 a6 a7 PT_XTREGS_OPT -#ifdef CONFIG_TRACE_IRQFLAGS - l32i a4, a1, PT_DEPC - /* Double exception means we came here with an exception - * while PS.EXCM was set, i.e. interrupts disabled. - */ - bgeui a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 1f - l32i a4, a1, PT_EXCCAUSE - bnei a4, EXCCAUSE_LEVEL1_INTERRUPT, 1f - /* We came here with an interrupt means interrupts were enabled - * and we've just disabled them. - */ - movi a4, trace_hardirqs_off - callx4 a4 -1: -#endif - /* Go to second-level dispatcher. Set up parameters to pass to the * exception handler and call the exception handler. */ rsr a4, excsave1 mov a6, a1 # pass stack frame - mov a7, a0 # pass EXCCAUSE - addx4 a4, a0, a4 + mov a7, a2 # pass EXCCAUSE + addx4 a4, a2, a4 l32i a4, a4, EXC_TABLE_DEFAULT # load handler /* Call the second-level handler */ @@ -419,8 +464,17 @@ common_exception: .global common_exception_return common_exception_return: +#if XTENSA_FAKE_NMI + l32i a2, a1, PT_EXCCAUSE + movi a3, EXCCAUSE_MAPPED_NMI + beq a2, a3, .LNMIexit +#endif 1: - rsil a2, LOCKLEVEL + irq_save a2, a3 +#ifdef CONFIG_TRACE_IRQFLAGS + movi a4, trace_hardirqs_off + callx4 a4 +#endif /* Jump if we are returning from kernel exceptions. */ @@ -445,6 +499,10 @@ common_exception_return: /* Call do_signal() */ +#ifdef CONFIG_TRACE_IRQFLAGS + movi a4, trace_hardirqs_on + callx4 a4 +#endif rsil a2, 0 movi a4, do_notify_resume # int do_notify_resume(struct pt_regs*) mov a6, a1 @@ -453,6 +511,10 @@ common_exception_return: 3: /* Reschedule */ +#ifdef CONFIG_TRACE_IRQFLAGS + movi a4, trace_hardirqs_on + callx4 a4 +#endif rsil a2, 0 movi a4, schedule # void schedule (void) callx4 a4 @@ -471,6 +533,12 @@ common_exception_return: j 1b #endif +#if XTENSA_FAKE_NMI +.LNMIexit: + l32i a3, a1, PT_PS + _bbci.l a3, PS_UM_BIT, 4f +#endif + 5: #ifdef CONFIG_DEBUG_TLB_SANITY l32i a4, a1, PT_DEPC @@ -481,16 +549,8 @@ common_exception_return: 6: 4: #ifdef CONFIG_TRACE_IRQFLAGS - l32i a4, a1, PT_DEPC - /* Double exception means we came here with an exception - * while PS.EXCM was set, i.e. interrupts disabled. - */ - bgeui a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 1f - l32i a4, a1, PT_EXCCAUSE - bnei a4, EXCCAUSE_LEVEL1_INTERRUPT, 1f - /* We came here with an interrupt means interrupts were enabled - * and we'll reenable them on return. - */ + extui a4, a3, PS_INTLEVEL_SHIFT, PS_INTLEVEL_WIDTH + bgei a4, LOCKLEVEL, 1f movi a4, trace_hardirqs_on callx4 a4 1: @@ -568,12 +628,13 @@ user_exception_exit: * (if we have restored WSBITS-1 frames). */ +2: #if XCHAL_HAVE_THREADPTR l32i a3, a1, PT_THREADPTR wur a3, threadptr #endif -2: j common_exception_exit + j common_exception_exit /* This is the kernel exception exit. * We avoided to do a MOVSP when we entered the exception, but we @@ -1561,6 +1622,13 @@ ENTRY(fast_second_level_miss) rfde 9: l32i a0, a1, TASK_ACTIVE_MM # unlikely case mm == 0 + bnez a0, 8b + + /* Even more unlikely case active_mm == 0. + * We can get here with NMI in the middle of context_switch that + * touches vmalloc area. + */ + movi a0, init_mm j 8b #if (DCACHE_WAY_SIZE > PAGE_SIZE) @@ -1820,7 +1888,7 @@ ENDPROC(system_call) mov a12, a0 .endr #endif - _entry a1, 48 + _entry a1, 16 #if XCHAL_NUM_AREGS % 12 == 0 mov a8, a8 #elif XCHAL_NUM_AREGS % 12 == 4 @@ -1844,7 +1912,7 @@ ENDPROC(system_call) ENTRY(_switch_to) - entry a1, 16 + entry a1, 48 mov a11, a3 # and 'next' (a3) @@ -1864,10 +1932,8 @@ ENTRY(_switch_to) /* Disable ints while we manipulate the stack pointer. */ - rsil a14, LOCKLEVEL - rsr a3, excsave1 + irq_save a14, a3 rsync - s32i a3, a3, EXC_TABLE_FIXUP /* enter critical section */ /* Switch CPENABLE */ @@ -1888,9 +1954,7 @@ ENTRY(_switch_to) */ rsr a3, excsave1 # exc_table - movi a6, 0 addi a7, a5, PT_REGS_OFFSET - s32i a6, a3, EXC_TABLE_FIXUP s32i a7, a3, EXC_TABLE_KSTK /* restore context of the task 'next' */ diff --git a/arch/xtensa/kernel/irq.c b/arch/xtensa/kernel/irq.c index 3eee94f621eb..4ac3d23161cf 100644 --- a/arch/xtensa/kernel/irq.c +++ b/arch/xtensa/kernel/irq.c @@ -28,7 +28,7 @@ #include <asm/uaccess.h> #include <asm/platform.h> -atomic_t irq_err_count; +DECLARE_PER_CPU(unsigned long, nmi_count); asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs) { @@ -57,11 +57,16 @@ asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs) int arch_show_interrupts(struct seq_file *p, int prec) { + unsigned cpu __maybe_unused; #ifdef CONFIG_SMP show_ipi_list(p, prec); #endif - seq_printf(p, "%*s: ", prec, "ERR"); - seq_printf(p, "%10u\n", atomic_read(&irq_err_count)); +#if XTENSA_FAKE_NMI + seq_printf(p, "%*s:", prec, "NMI"); + for_each_online_cpu(cpu) + seq_printf(p, " %10lu", per_cpu(nmi_count, cpu)); + seq_puts(p, " Non-maskable interrupts\n"); +#endif return 0; } @@ -106,6 +111,12 @@ int xtensa_irq_map(struct irq_domain *d, unsigned int irq, irq_set_chip_and_handler_name(irq, irq_chip, handle_percpu_irq, "timer"); irq_clear_status_flags(irq, IRQ_LEVEL); +#ifdef XCHAL_INTTYPE_MASK_PROFILING + } else if (mask & XCHAL_INTTYPE_MASK_PROFILING) { + irq_set_chip_and_handler_name(irq, irq_chip, + handle_percpu_irq, "profiling"); + irq_set_status_flags(irq, IRQ_LEVEL); +#endif } else {/* XCHAL_INTTYPE_MASK_WRITE_ERROR */ /* XCHAL_INTTYPE_MASK_NMI */ irq_set_chip_and_handler_name(irq, irq_chip, @@ -166,23 +177,25 @@ void migrate_irqs(void) for_each_active_irq(i) { struct irq_data *data = irq_get_irq_data(i); + struct cpumask *mask; unsigned int newcpu; if (irqd_is_per_cpu(data)) continue; - if (!cpumask_test_cpu(cpu, data->affinity)) + mask = irq_data_get_affinity_mask(data); + if (!cpumask_test_cpu(cpu, mask)) continue; - newcpu = cpumask_any_and(data->affinity, cpu_online_mask); + newcpu = cpumask_any_and(mask, cpu_online_mask); if (newcpu >= nr_cpu_ids) { pr_info_ratelimited("IRQ%u no longer affine to CPU%u\n", i, cpu); - cpumask_setall(data->affinity); + cpumask_setall(mask); } - irq_set_affinity(i, data->affinity); + irq_set_affinity(i, mask); } } #endif /* CONFIG_HOTPLUG_CPU */ diff --git a/arch/xtensa/kernel/pci-dma.c b/arch/xtensa/kernel/pci-dma.c index e8b76b8e4b29..fb75ebf1463a 100644 --- a/arch/xtensa/kernel/pci-dma.c +++ b/arch/xtensa/kernel/pci-dma.c @@ -1,6 +1,4 @@ /* - * arch/xtensa/kernel/pci-dma.c - * * DMA coherent memory allocation. * * This program is free software; you can redistribute it and/or modify it @@ -9,6 +7,7 @@ * option) any later version. * * Copyright (C) 2002 - 2005 Tensilica Inc. + * Copyright (C) 2015 Cadence Design Systems Inc. * * Based on version for i386. * @@ -25,13 +24,107 @@ #include <asm/io.h> #include <asm/cacheflush.h> +void dma_cache_sync(struct device *dev, void *vaddr, size_t size, + enum dma_data_direction dir) +{ + switch (dir) { + case DMA_BIDIRECTIONAL: + __flush_invalidate_dcache_range((unsigned long)vaddr, size); + break; + + case DMA_FROM_DEVICE: + __invalidate_dcache_range((unsigned long)vaddr, size); + break; + + case DMA_TO_DEVICE: + __flush_dcache_range((unsigned long)vaddr, size); + break; + + case DMA_NONE: + BUG(); + break; + } +} +EXPORT_SYMBOL(dma_cache_sync); + +static void xtensa_sync_single_for_cpu(struct device *dev, + dma_addr_t dma_handle, size_t size, + enum dma_data_direction dir) +{ + void *vaddr; + + switch (dir) { + case DMA_BIDIRECTIONAL: + case DMA_FROM_DEVICE: + vaddr = bus_to_virt(dma_handle); + __invalidate_dcache_range((unsigned long)vaddr, size); + break; + + case DMA_NONE: + BUG(); + break; + + default: + break; + } +} + +static void xtensa_sync_single_for_device(struct device *dev, + dma_addr_t dma_handle, size_t size, + enum dma_data_direction dir) +{ + void *vaddr; + + switch (dir) { + case DMA_BIDIRECTIONAL: + case DMA_TO_DEVICE: + vaddr = bus_to_virt(dma_handle); + __flush_dcache_range((unsigned long)vaddr, size); + break; + + case DMA_NONE: + BUG(); + break; + + default: + break; + } +} + +static void xtensa_sync_sg_for_cpu(struct device *dev, + struct scatterlist *sg, int nents, + enum dma_data_direction dir) +{ + struct scatterlist *s; + int i; + + for_each_sg(sg, s, nents, i) { + xtensa_sync_single_for_cpu(dev, sg_dma_address(s), + sg_dma_len(s), dir); + } +} + +static void xtensa_sync_sg_for_device(struct device *dev, + struct scatterlist *sg, int nents, + enum dma_data_direction dir) +{ + struct scatterlist *s; + int i; + + for_each_sg(sg, s, nents, i) { + xtensa_sync_single_for_device(dev, sg_dma_address(s), + sg_dma_len(s), dir); + } +} + /* * Note: We assume that the full memory space is always mapped to 'kseg' * Otherwise we have to use page attributes (not implemented). */ -void * -dma_alloc_coherent(struct device *dev,size_t size,dma_addr_t *handle,gfp_t flag) +static void *xtensa_dma_alloc(struct device *dev, size_t size, + dma_addr_t *handle, gfp_t flag, + struct dma_attrs *attrs) { unsigned long ret; unsigned long uncached = 0; @@ -52,20 +145,15 @@ dma_alloc_coherent(struct device *dev,size_t size,dma_addr_t *handle,gfp_t flag) BUG_ON(ret < XCHAL_KSEG_CACHED_VADDR || ret > XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_SIZE - 1); + uncached = ret + XCHAL_KSEG_BYPASS_VADDR - XCHAL_KSEG_CACHED_VADDR; + *handle = virt_to_bus((void *)ret); + __invalidate_dcache_range(ret, size); - if (ret != 0) { - memset((void*) ret, 0, size); - uncached = ret+XCHAL_KSEG_BYPASS_VADDR-XCHAL_KSEG_CACHED_VADDR; - *handle = virt_to_bus((void*)ret); - __flush_invalidate_dcache_range(ret, size); - } - - return (void*)uncached; + return (void *)uncached; } -EXPORT_SYMBOL(dma_alloc_coherent); -void dma_free_coherent(struct device *hwdev, size_t size, - void *vaddr, dma_addr_t dma_handle) +static void xtensa_dma_free(struct device *hwdev, size_t size, void *vaddr, + dma_addr_t dma_handle, struct dma_attrs *attrs) { unsigned long addr = (unsigned long)vaddr + XCHAL_KSEG_CACHED_VADDR - XCHAL_KSEG_BYPASS_VADDR; @@ -75,24 +163,79 @@ void dma_free_coherent(struct device *hwdev, size_t size, free_pages(addr, get_order(size)); } -EXPORT_SYMBOL(dma_free_coherent); +static dma_addr_t xtensa_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + dma_addr_t dma_handle = page_to_phys(page) + offset; + + BUG_ON(PageHighMem(page)); + xtensa_sync_single_for_device(dev, dma_handle, size, dir); + return dma_handle; +} -void consistent_sync(void *vaddr, size_t size, int direction) +static void xtensa_unmap_page(struct device *dev, dma_addr_t dma_handle, + size_t size, enum dma_data_direction dir, + struct dma_attrs *attrs) { - switch (direction) { - case PCI_DMA_NONE: - BUG(); - case PCI_DMA_FROMDEVICE: /* invalidate only */ - __invalidate_dcache_range((unsigned long)vaddr, - (unsigned long)size); - break; + xtensa_sync_single_for_cpu(dev, dma_handle, size, dir); +} - case PCI_DMA_TODEVICE: /* writeback only */ - case PCI_DMA_BIDIRECTIONAL: /* writeback and invalidate */ - __flush_invalidate_dcache_range((unsigned long)vaddr, - (unsigned long)size); - break; +static int xtensa_map_sg(struct device *dev, struct scatterlist *sg, + int nents, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + struct scatterlist *s; + int i; + + for_each_sg(sg, s, nents, i) { + s->dma_address = xtensa_map_page(dev, sg_page(s), s->offset, + s->length, dir, attrs); + } + return nents; +} + +static void xtensa_unmap_sg(struct device *dev, + struct scatterlist *sg, int nents, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + struct scatterlist *s; + int i; + + for_each_sg(sg, s, nents, i) { + xtensa_unmap_page(dev, sg_dma_address(s), + sg_dma_len(s), dir, attrs); } } -EXPORT_SYMBOL(consistent_sync); + +int xtensa_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) +{ + return 0; +} + +struct dma_map_ops xtensa_dma_map_ops = { + .alloc = xtensa_dma_alloc, + .free = xtensa_dma_free, + .map_page = xtensa_map_page, + .unmap_page = xtensa_unmap_page, + .map_sg = xtensa_map_sg, + .unmap_sg = xtensa_unmap_sg, + .sync_single_for_cpu = xtensa_sync_single_for_cpu, + .sync_single_for_device = xtensa_sync_single_for_device, + .sync_sg_for_cpu = xtensa_sync_sg_for_cpu, + .sync_sg_for_device = xtensa_sync_sg_for_device, + .mapping_error = xtensa_dma_mapping_error, +}; +EXPORT_SYMBOL(xtensa_dma_map_ops); + +#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16) + +static int __init xtensa_dma_init(void) +{ + dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); + return 0; +} +fs_initcall(xtensa_dma_init); diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c index b848cc3dc913..d27b4dcf221f 100644 --- a/arch/xtensa/kernel/pci.c +++ b/arch/xtensa/kernel/pci.c @@ -210,10 +210,6 @@ subsys_initcall(pcibios_init); void pcibios_fixup_bus(struct pci_bus *bus) { - if (bus->parent) { - /* This is a subordinate bridge */ - pci_read_bridge_bases(bus); - } } void pcibios_set_master(struct pci_dev *dev) diff --git a/arch/xtensa/kernel/perf_event.c b/arch/xtensa/kernel/perf_event.c new file mode 100644 index 000000000000..54f01188c29c --- /dev/null +++ b/arch/xtensa/kernel/perf_event.c @@ -0,0 +1,454 @@ +/* + * Xtensa Performance Monitor Module driver + * See Tensilica Debug User's Guide for PMU registers documentation. + * + * Copyright (C) 2015 Cadence Design Systems Inc. + * + * 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 + * published by the Free Software Foundation. + */ + +#include <linux/interrupt.h> +#include <linux/irqdomain.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/perf_event.h> +#include <linux/platform_device.h> + +#include <asm/processor.h> +#include <asm/stacktrace.h> + +/* Global control/status for all perf counters */ +#define XTENSA_PMU_PMG 0x1000 +/* Perf counter values */ +#define XTENSA_PMU_PM(i) (0x1080 + (i) * 4) +/* Perf counter control registers */ +#define XTENSA_PMU_PMCTRL(i) (0x1100 + (i) * 4) +/* Perf counter status registers */ +#define XTENSA_PMU_PMSTAT(i) (0x1180 + (i) * 4) + +#define XTENSA_PMU_PMG_PMEN 0x1 + +#define XTENSA_PMU_COUNTER_MASK 0xffffffffULL +#define XTENSA_PMU_COUNTER_MAX 0x7fffffff + +#define XTENSA_PMU_PMCTRL_INTEN 0x00000001 +#define XTENSA_PMU_PMCTRL_KRNLCNT 0x00000008 +#define XTENSA_PMU_PMCTRL_TRACELEVEL 0x000000f0 +#define XTENSA_PMU_PMCTRL_SELECT_SHIFT 8 +#define XTENSA_PMU_PMCTRL_SELECT 0x00001f00 +#define XTENSA_PMU_PMCTRL_MASK_SHIFT 16 +#define XTENSA_PMU_PMCTRL_MASK 0xffff0000 + +#define XTENSA_PMU_MASK(select, mask) \ + (((select) << XTENSA_PMU_PMCTRL_SELECT_SHIFT) | \ + ((mask) << XTENSA_PMU_PMCTRL_MASK_SHIFT) | \ + XTENSA_PMU_PMCTRL_TRACELEVEL | \ + XTENSA_PMU_PMCTRL_INTEN) + +#define XTENSA_PMU_PMSTAT_OVFL 0x00000001 +#define XTENSA_PMU_PMSTAT_INTASRT 0x00000010 + +struct xtensa_pmu_events { + /* Array of events currently on this core */ + struct perf_event *event[XCHAL_NUM_PERF_COUNTERS]; + /* Bitmap of used hardware counters */ + unsigned long used_mask[BITS_TO_LONGS(XCHAL_NUM_PERF_COUNTERS)]; +}; +static DEFINE_PER_CPU(struct xtensa_pmu_events, xtensa_pmu_events); + +static const u32 xtensa_hw_ctl[] = { + [PERF_COUNT_HW_CPU_CYCLES] = XTENSA_PMU_MASK(0, 0x1), + [PERF_COUNT_HW_INSTRUCTIONS] = XTENSA_PMU_MASK(2, 0xffff), + [PERF_COUNT_HW_CACHE_REFERENCES] = XTENSA_PMU_MASK(10, 0x1), + [PERF_COUNT_HW_CACHE_MISSES] = XTENSA_PMU_MASK(12, 0x1), + /* Taken and non-taken branches + taken loop ends */ + [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = XTENSA_PMU_MASK(2, 0x490), + /* Instruction-related + other global stall cycles */ + [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = XTENSA_PMU_MASK(4, 0x1ff), + /* Data-related global stall cycles */ + [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = XTENSA_PMU_MASK(3, 0x1ff), +}; + +#define C(_x) PERF_COUNT_HW_CACHE_##_x + +static const u32 xtensa_cache_ctl[][C(OP_MAX)][C(RESULT_MAX)] = { + [C(L1D)] = { + [C(OP_READ)] = { + [C(RESULT_ACCESS)] = XTENSA_PMU_MASK(10, 0x1), + [C(RESULT_MISS)] = XTENSA_PMU_MASK(10, 0x2), + }, + [C(OP_WRITE)] = { + [C(RESULT_ACCESS)] = XTENSA_PMU_MASK(11, 0x1), + [C(RESULT_MISS)] = XTENSA_PMU_MASK(11, 0x2), + }, + }, + [C(L1I)] = { + [C(OP_READ)] = { + [C(RESULT_ACCESS)] = XTENSA_PMU_MASK(8, 0x1), + [C(RESULT_MISS)] = XTENSA_PMU_MASK(8, 0x2), + }, + }, + [C(DTLB)] = { + [C(OP_READ)] = { + [C(RESULT_ACCESS)] = XTENSA_PMU_MASK(9, 0x1), + [C(RESULT_MISS)] = XTENSA_PMU_MASK(9, 0x8), + }, + }, + [C(ITLB)] = { + [C(OP_READ)] = { + [C(RESULT_ACCESS)] = XTENSA_PMU_MASK(7, 0x1), + [C(RESULT_MISS)] = XTENSA_PMU_MASK(7, 0x8), + }, + }, +}; + +static int xtensa_pmu_cache_event(u64 config) +{ + unsigned int cache_type, cache_op, cache_result; + int ret; + + cache_type = (config >> 0) & 0xff; + cache_op = (config >> 8) & 0xff; + cache_result = (config >> 16) & 0xff; + + if (cache_type >= ARRAY_SIZE(xtensa_cache_ctl) || + cache_op >= C(OP_MAX) || + cache_result >= C(RESULT_MAX)) + return -EINVAL; + + ret = xtensa_cache_ctl[cache_type][cache_op][cache_result]; + + if (ret == 0) + return -EINVAL; + + return ret; +} + +static inline uint32_t xtensa_pmu_read_counter(int idx) +{ + return get_er(XTENSA_PMU_PM(idx)); +} + +static inline void xtensa_pmu_write_counter(int idx, uint32_t v) +{ + set_er(v, XTENSA_PMU_PM(idx)); +} + +static void xtensa_perf_event_update(struct perf_event *event, + struct hw_perf_event *hwc, int idx) +{ + uint64_t prev_raw_count, new_raw_count; + int64_t delta; + + do { + prev_raw_count = local64_read(&hwc->prev_count); + new_raw_count = xtensa_pmu_read_counter(event->hw.idx); + } while (local64_cmpxchg(&hwc->prev_count, prev_raw_count, + new_raw_count) != prev_raw_count); + + delta = (new_raw_count - prev_raw_count) & XTENSA_PMU_COUNTER_MASK; + + local64_add(delta, &event->count); + local64_sub(delta, &hwc->period_left); +} + +static bool xtensa_perf_event_set_period(struct perf_event *event, + struct hw_perf_event *hwc, int idx) +{ + bool rc = false; + s64 left; + + if (!is_sampling_event(event)) { + left = XTENSA_PMU_COUNTER_MAX; + } else { + s64 period = hwc->sample_period; + + left = local64_read(&hwc->period_left); + if (left <= -period) { + left = period; + local64_set(&hwc->period_left, left); + hwc->last_period = period; + rc = true; + } else if (left <= 0) { + left += period; + local64_set(&hwc->period_left, left); + hwc->last_period = period; + rc = true; + } + if (left > XTENSA_PMU_COUNTER_MAX) + left = XTENSA_PMU_COUNTER_MAX; + } + + local64_set(&hwc->prev_count, -left); + xtensa_pmu_write_counter(idx, -left); + perf_event_update_userpage(event); + + return rc; +} + +static void xtensa_pmu_enable(struct pmu *pmu) +{ + set_er(get_er(XTENSA_PMU_PMG) | XTENSA_PMU_PMG_PMEN, XTENSA_PMU_PMG); +} + +static void xtensa_pmu_disable(struct pmu *pmu) +{ + set_er(get_er(XTENSA_PMU_PMG) & ~XTENSA_PMU_PMG_PMEN, XTENSA_PMU_PMG); +} + +static int xtensa_pmu_event_init(struct perf_event *event) +{ + int ret; + + switch (event->attr.type) { + case PERF_TYPE_HARDWARE: + if (event->attr.config >= ARRAY_SIZE(xtensa_hw_ctl) || + xtensa_hw_ctl[event->attr.config] == 0) + return -EINVAL; + event->hw.config = xtensa_hw_ctl[event->attr.config]; + return 0; + + case PERF_TYPE_HW_CACHE: + ret = xtensa_pmu_cache_event(event->attr.config); + if (ret < 0) + return ret; + event->hw.config = ret; + return 0; + + case PERF_TYPE_RAW: + /* Not 'previous counter' select */ + if ((event->attr.config & XTENSA_PMU_PMCTRL_SELECT) == + (1 << XTENSA_PMU_PMCTRL_SELECT_SHIFT)) + return -EINVAL; + event->hw.config = (event->attr.config & + (XTENSA_PMU_PMCTRL_KRNLCNT | + XTENSA_PMU_PMCTRL_TRACELEVEL | + XTENSA_PMU_PMCTRL_SELECT | + XTENSA_PMU_PMCTRL_MASK)) | + XTENSA_PMU_PMCTRL_INTEN; + return 0; + + default: + return -ENOENT; + } +} + +/* + * Starts/Stops a counter present on the PMU. The PMI handler + * should stop the counter when perf_event_overflow() returns + * !0. ->start() will be used to continue. + */ +static void xtensa_pmu_start(struct perf_event *event, int flags) +{ + struct hw_perf_event *hwc = &event->hw; + int idx = hwc->idx; + + if (WARN_ON_ONCE(idx == -1)) + return; + + if (flags & PERF_EF_RELOAD) { + WARN_ON_ONCE(!(event->hw.state & PERF_HES_UPTODATE)); + xtensa_perf_event_set_period(event, hwc, idx); + } + + hwc->state = 0; + + set_er(hwc->config, XTENSA_PMU_PMCTRL(idx)); +} + +static void xtensa_pmu_stop(struct perf_event *event, int flags) +{ + struct hw_perf_event *hwc = &event->hw; + int idx = hwc->idx; + + if (!(hwc->state & PERF_HES_STOPPED)) { + set_er(0, XTENSA_PMU_PMCTRL(idx)); + set_er(get_er(XTENSA_PMU_PMSTAT(idx)), + XTENSA_PMU_PMSTAT(idx)); + hwc->state |= PERF_HES_STOPPED; + } + + if ((flags & PERF_EF_UPDATE) && + !(event->hw.state & PERF_HES_UPTODATE)) { + xtensa_perf_event_update(event, &event->hw, idx); + event->hw.state |= PERF_HES_UPTODATE; + } +} + +/* + * Adds/Removes a counter to/from the PMU, can be done inside + * a transaction, see the ->*_txn() methods. + */ +static int xtensa_pmu_add(struct perf_event *event, int flags) +{ + struct xtensa_pmu_events *ev = this_cpu_ptr(&xtensa_pmu_events); + struct hw_perf_event *hwc = &event->hw; + int idx = hwc->idx; + + if (__test_and_set_bit(idx, ev->used_mask)) { + idx = find_first_zero_bit(ev->used_mask, + XCHAL_NUM_PERF_COUNTERS); + if (idx == XCHAL_NUM_PERF_COUNTERS) + return -EAGAIN; + + __set_bit(idx, ev->used_mask); + hwc->idx = idx; + } + ev->event[idx] = event; + + hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED; + + if (flags & PERF_EF_START) + xtensa_pmu_start(event, PERF_EF_RELOAD); + + perf_event_update_userpage(event); + return 0; +} + +static void xtensa_pmu_del(struct perf_event *event, int flags) +{ + struct xtensa_pmu_events *ev = this_cpu_ptr(&xtensa_pmu_events); + + xtensa_pmu_stop(event, PERF_EF_UPDATE); + __clear_bit(event->hw.idx, ev->used_mask); + perf_event_update_userpage(event); +} + +static void xtensa_pmu_read(struct perf_event *event) +{ + xtensa_perf_event_update(event, &event->hw, event->hw.idx); +} + +static int callchain_trace(struct stackframe *frame, void *data) +{ + struct perf_callchain_entry *entry = data; + + perf_callchain_store(entry, frame->pc); + return 0; +} + +void perf_callchain_kernel(struct perf_callchain_entry *entry, + struct pt_regs *regs) +{ + xtensa_backtrace_kernel(regs, PERF_MAX_STACK_DEPTH, + callchain_trace, NULL, entry); +} + +void perf_callchain_user(struct perf_callchain_entry *entry, + struct pt_regs *regs) +{ + xtensa_backtrace_user(regs, PERF_MAX_STACK_DEPTH, + callchain_trace, entry); +} + +void perf_event_print_debug(void) +{ + unsigned long flags; + unsigned i; + + local_irq_save(flags); + pr_info("CPU#%d: PMG: 0x%08lx\n", smp_processor_id(), + get_er(XTENSA_PMU_PMG)); + for (i = 0; i < XCHAL_NUM_PERF_COUNTERS; ++i) + pr_info("PM%d: 0x%08lx, PMCTRL%d: 0x%08lx, PMSTAT%d: 0x%08lx\n", + i, get_er(XTENSA_PMU_PM(i)), + i, get_er(XTENSA_PMU_PMCTRL(i)), + i, get_er(XTENSA_PMU_PMSTAT(i))); + local_irq_restore(flags); +} + +irqreturn_t xtensa_pmu_irq_handler(int irq, void *dev_id) +{ + irqreturn_t rc = IRQ_NONE; + struct xtensa_pmu_events *ev = this_cpu_ptr(&xtensa_pmu_events); + unsigned i; + + for (i = find_first_bit(ev->used_mask, XCHAL_NUM_PERF_COUNTERS); + i < XCHAL_NUM_PERF_COUNTERS; + i = find_next_bit(ev->used_mask, XCHAL_NUM_PERF_COUNTERS, i + 1)) { + uint32_t v = get_er(XTENSA_PMU_PMSTAT(i)); + struct perf_event *event = ev->event[i]; + struct hw_perf_event *hwc = &event->hw; + u64 last_period; + + if (!(v & XTENSA_PMU_PMSTAT_OVFL)) + continue; + + set_er(v, XTENSA_PMU_PMSTAT(i)); + xtensa_perf_event_update(event, hwc, i); + last_period = hwc->last_period; + if (xtensa_perf_event_set_period(event, hwc, i)) { + struct perf_sample_data data; + struct pt_regs *regs = get_irq_regs(); + + perf_sample_data_init(&data, 0, last_period); + if (perf_event_overflow(event, &data, regs)) + xtensa_pmu_stop(event, 0); + } + + rc = IRQ_HANDLED; + } + return rc; +} + +static struct pmu xtensa_pmu = { + .pmu_enable = xtensa_pmu_enable, + .pmu_disable = xtensa_pmu_disable, + .event_init = xtensa_pmu_event_init, + .add = xtensa_pmu_add, + .del = xtensa_pmu_del, + .start = xtensa_pmu_start, + .stop = xtensa_pmu_stop, + .read = xtensa_pmu_read, +}; + +static void xtensa_pmu_setup(void) +{ + unsigned i; + + set_er(0, XTENSA_PMU_PMG); + for (i = 0; i < XCHAL_NUM_PERF_COUNTERS; ++i) { + set_er(0, XTENSA_PMU_PMCTRL(i)); + set_er(get_er(XTENSA_PMU_PMSTAT(i)), XTENSA_PMU_PMSTAT(i)); + } +} + +static int xtensa_pmu_notifier(struct notifier_block *self, + unsigned long action, void *data) +{ + switch (action & ~CPU_TASKS_FROZEN) { + case CPU_STARTING: + xtensa_pmu_setup(); + break; + + default: + break; + } + + return NOTIFY_OK; +} + +static int __init xtensa_pmu_init(void) +{ + int ret; + int irq = irq_create_mapping(NULL, XCHAL_PROFILING_INTERRUPT); + + perf_cpu_notifier(xtensa_pmu_notifier); +#if XTENSA_FAKE_NMI + enable_irq(irq); +#else + ret = request_irq(irq, xtensa_pmu_irq_handler, IRQF_PERCPU, + "pmu", NULL); + if (ret < 0) + return ret; +#endif + + ret = perf_pmu_register(&xtensa_pmu, "cpu", PERF_TYPE_RAW); + if (ret) + free_irq(irq, NULL); + + return ret; +} +early_initcall(xtensa_pmu_init); diff --git a/arch/xtensa/kernel/stacktrace.c b/arch/xtensa/kernel/stacktrace.c index 7d2c317bd98b..7538d802b65a 100644 --- a/arch/xtensa/kernel/stacktrace.c +++ b/arch/xtensa/kernel/stacktrace.c @@ -1,11 +1,12 @@ /* - * arch/xtensa/kernel/stacktrace.c + * Kernel and userspace stack tracing. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2001 - 2013 Tensilica Inc. + * Copyright (C) 2015 Cadence Design Systems Inc. */ #include <linux/export.h> #include <linux/sched.h> @@ -13,6 +14,170 @@ #include <asm/stacktrace.h> #include <asm/traps.h> +#include <asm/uaccess.h> + +#if IS_ENABLED(CONFIG_OPROFILE) || IS_ENABLED(CONFIG_PERF_EVENTS) + +/* Address of common_exception_return, used to check the + * transition from kernel to user space. + */ +extern int common_exception_return; + +/* A struct that maps to the part of the frame containing the a0 and + * a1 registers. + */ +struct frame_start { + unsigned long a0; + unsigned long a1; +}; + +void xtensa_backtrace_user(struct pt_regs *regs, unsigned int depth, + int (*ufn)(struct stackframe *frame, void *data), + void *data) +{ + unsigned long windowstart = regs->windowstart; + unsigned long windowbase = regs->windowbase; + unsigned long a0 = regs->areg[0]; + unsigned long a1 = regs->areg[1]; + unsigned long pc = regs->pc; + struct stackframe frame; + int index; + + if (!depth--) + return; + + frame.pc = pc; + frame.sp = a1; + + if (pc == 0 || pc >= TASK_SIZE || ufn(&frame, data)) + return; + + /* Two steps: + * + * 1. Look through the register window for the + * previous PCs in the call trace. + * + * 2. Look on the stack. + */ + + /* Step 1. */ + /* Rotate WINDOWSTART to move the bit corresponding to + * the current window to the bit #0. + */ + windowstart = (windowstart << WSBITS | windowstart) >> windowbase; + + /* Look for bits that are set, they correspond to + * valid windows. + */ + for (index = WSBITS - 1; (index > 0) && depth; depth--, index--) + if (windowstart & (1 << index)) { + /* Get the PC from a0 and a1. */ + pc = MAKE_PC_FROM_RA(a0, pc); + /* Read a0 and a1 from the + * corresponding position in AREGs. + */ + a0 = regs->areg[index * 4]; + a1 = regs->areg[index * 4 + 1]; + + frame.pc = pc; + frame.sp = a1; + + if (pc == 0 || pc >= TASK_SIZE || ufn(&frame, data)) + return; + } + + /* Step 2. */ + /* We are done with the register window, we need to + * look through the stack. + */ + if (!depth) + return; + + /* Start from the a1 register. */ + /* a1 = regs->areg[1]; */ + while (a0 != 0 && depth--) { + struct frame_start frame_start; + /* Get the location for a1, a0 for the + * previous frame from the current a1. + */ + unsigned long *psp = (unsigned long *)a1; + + psp -= 4; + + /* Check if the region is OK to access. */ + if (!access_ok(VERIFY_READ, psp, sizeof(frame_start))) + return; + /* Copy a1, a0 from user space stack frame. */ + if (__copy_from_user_inatomic(&frame_start, psp, + sizeof(frame_start))) + return; + + pc = MAKE_PC_FROM_RA(a0, pc); + a0 = frame_start.a0; + a1 = frame_start.a1; + + frame.pc = pc; + frame.sp = a1; + + if (pc == 0 || pc >= TASK_SIZE || ufn(&frame, data)) + return; + } +} +EXPORT_SYMBOL(xtensa_backtrace_user); + +void xtensa_backtrace_kernel(struct pt_regs *regs, unsigned int depth, + int (*kfn)(struct stackframe *frame, void *data), + int (*ufn)(struct stackframe *frame, void *data), + void *data) +{ + unsigned long pc = regs->depc > VALID_DOUBLE_EXCEPTION_ADDRESS ? + regs->depc : regs->pc; + unsigned long sp_start, sp_end; + unsigned long a0 = regs->areg[0]; + unsigned long a1 = regs->areg[1]; + + sp_start = a1 & ~(THREAD_SIZE - 1); + sp_end = sp_start + THREAD_SIZE; + + /* Spill the register window to the stack first. */ + spill_registers(); + + /* Read the stack frames one by one and create the PC + * from the a0 and a1 registers saved there. + */ + while (a1 > sp_start && a1 < sp_end && depth--) { + struct stackframe frame; + unsigned long *psp = (unsigned long *)a1; + + frame.pc = pc; + frame.sp = a1; + + if (kernel_text_address(pc) && kfn(&frame, data)) + return; + + if (pc == (unsigned long)&common_exception_return) { + regs = (struct pt_regs *)a1; + if (user_mode(regs)) { + if (ufn == NULL) + return; + xtensa_backtrace_user(regs, depth, ufn, data); + return; + } + a0 = regs->areg[0]; + a1 = regs->areg[1]; + continue; + } + + sp_start = a1; + + pc = MAKE_PC_FROM_RA(a0, pc); + a0 = *(psp - 4); + a1 = *(psp - 3); + } +} +EXPORT_SYMBOL(xtensa_backtrace_kernel); + +#endif void walk_stackframe(unsigned long *sp, int (*fn)(struct stackframe *frame, void *data), diff --git a/arch/xtensa/kernel/time.c b/arch/xtensa/kernel/time.c index 2a1823de69cc..b97767dbc7c8 100644 --- a/arch/xtensa/kernel/time.c +++ b/arch/xtensa/kernel/time.c @@ -52,8 +52,6 @@ static struct clocksource ccount_clocksource = { static int ccount_timer_set_next_event(unsigned long delta, struct clock_event_device *dev); -static void ccount_timer_set_mode(enum clock_event_mode mode, - struct clock_event_device *evt); struct ccount_timer { struct clock_event_device evt; int irq_enabled; @@ -77,35 +75,34 @@ static int ccount_timer_set_next_event(unsigned long delta, return ret; } -static void ccount_timer_set_mode(enum clock_event_mode mode, - struct clock_event_device *evt) +/* + * There is no way to disable the timer interrupt at the device level, + * only at the intenable register itself. Since enable_irq/disable_irq + * calls are nested, we need to make sure that these calls are + * balanced. + */ +static int ccount_timer_shutdown(struct clock_event_device *evt) +{ + struct ccount_timer *timer = + container_of(evt, struct ccount_timer, evt); + + if (timer->irq_enabled) { + disable_irq(evt->irq); + timer->irq_enabled = 0; + } + return 0; +} + +static int ccount_timer_set_oneshot(struct clock_event_device *evt) { struct ccount_timer *timer = container_of(evt, struct ccount_timer, evt); - /* - * There is no way to disable the timer interrupt at the device level, - * only at the intenable register itself. Since enable_irq/disable_irq - * calls are nested, we need to make sure that these calls are - * balanced. - */ - switch (mode) { - case CLOCK_EVT_MODE_SHUTDOWN: - case CLOCK_EVT_MODE_UNUSED: - if (timer->irq_enabled) { - disable_irq(evt->irq); - timer->irq_enabled = 0; - } - break; - case CLOCK_EVT_MODE_RESUME: - case CLOCK_EVT_MODE_ONESHOT: - if (!timer->irq_enabled) { - enable_irq(evt->irq); - timer->irq_enabled = 1; - } - default: - break; + if (!timer->irq_enabled) { + enable_irq(evt->irq); + timer->irq_enabled = 1; } + return 0; } static irqreturn_t timer_interrupt(int irq, void *dev_id); @@ -126,7 +123,9 @@ void local_timer_setup(unsigned cpu) clockevent->features = CLOCK_EVT_FEAT_ONESHOT; clockevent->rating = 300; clockevent->set_next_event = ccount_timer_set_next_event; - clockevent->set_mode = ccount_timer_set_mode; + clockevent->set_state_shutdown = ccount_timer_shutdown; + clockevent->set_state_oneshot = ccount_timer_set_oneshot; + clockevent->tick_resume = ccount_timer_set_oneshot; clockevent->cpumask = cpumask_of(cpu); clockevent->irq = irq_create_mapping(NULL, LINUX_TIMER_INT); if (WARN(!clockevent->irq, "error: can't map timer irq")) diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c index 9d2f45f010ef..42d441f7898b 100644 --- a/arch/xtensa/kernel/traps.c +++ b/arch/xtensa/kernel/traps.c @@ -62,6 +62,7 @@ extern void fast_coprocessor(void); extern void do_illegal_instruction (struct pt_regs*); extern void do_interrupt (struct pt_regs*); +extern void do_nmi(struct pt_regs *); extern void do_unaligned_user (struct pt_regs*); extern void do_multihit (struct pt_regs*, unsigned long); extern void do_page_fault (struct pt_regs*, unsigned long); @@ -146,6 +147,9 @@ COPROCESSOR(6), #if XTENSA_HAVE_COPROCESSOR(7) COPROCESSOR(7), #endif +#if XTENSA_FAKE_NMI +{ EXCCAUSE_MAPPED_NMI, 0, do_nmi }, +#endif { EXCCAUSE_MAPPED_DEBUG, 0, do_debug }, { -1, -1, 0 } @@ -199,6 +203,28 @@ void do_multihit(struct pt_regs *regs, unsigned long exccause) extern void do_IRQ(int, struct pt_regs *); +#if XTENSA_FAKE_NMI + +irqreturn_t xtensa_pmu_irq_handler(int irq, void *dev_id); + +DEFINE_PER_CPU(unsigned long, nmi_count); + +void do_nmi(struct pt_regs *regs) +{ + struct pt_regs *old_regs; + + if ((regs->ps & PS_INTLEVEL_MASK) < LOCKLEVEL) + trace_hardirqs_off(); + + old_regs = set_irq_regs(regs); + nmi_enter(); + ++*this_cpu_ptr(&nmi_count); + xtensa_pmu_irq_handler(0, NULL); + nmi_exit(); + set_irq_regs(old_regs); +} +#endif + void do_interrupt(struct pt_regs *regs) { static const unsigned int_level_mask[] = { @@ -211,8 +237,11 @@ void do_interrupt(struct pt_regs *regs) XCHAL_INTLEVEL6_MASK, XCHAL_INTLEVEL7_MASK, }; - struct pt_regs *old_regs = set_irq_regs(regs); + struct pt_regs *old_regs; + + trace_hardirqs_off(); + old_regs = set_irq_regs(regs); irq_enter(); for (;;) { diff --git a/arch/xtensa/kernel/vectors.S b/arch/xtensa/kernel/vectors.S index 1b397a902292..abcdb527f18a 100644 --- a/arch/xtensa/kernel/vectors.S +++ b/arch/xtensa/kernel/vectors.S @@ -627,7 +627,11 @@ ENTRY(_Level\level\()InterruptVector) wsr a0, excsave2 rsr a0, epc\level wsr a0, epc1 + .if \level <= LOCKLEVEL movi a0, EXCCAUSE_LEVEL1_INTERRUPT + .else + movi a0, EXCCAUSE_MAPPED_NMI + .endif wsr a0, exccause rsr a0, eps\level # branch to user or kernel vector @@ -682,11 +686,13 @@ ENDPROC(_WindowOverflow4) .align 4 _SimulateUserKernelVectorException: addi a0, a0, (1 << PS_EXCM_BIT) +#if !XTENSA_FAKE_NMI wsr a0, ps +#endif bbsi.l a0, PS_UM_BIT, 1f # branch if user mode - rsr a0, excsave2 # restore a0 + xsr a0, excsave2 # restore a0 j _KernelExceptionVector # simulate kernel vector exception -1: rsr a0, excsave2 # restore a0 +1: xsr a0, excsave2 # restore a0 j _UserExceptionVector # simulate user vector exception #endif diff --git a/arch/xtensa/mm/fault.c b/arch/xtensa/mm/fault.c index 83a44a33cfa1..c9784c1b18d8 100644 --- a/arch/xtensa/mm/fault.c +++ b/arch/xtensa/mm/fault.c @@ -15,6 +15,7 @@ #include <linux/mm.h> #include <linux/module.h> #include <linux/hardirq.h> +#include <linux/perf_event.h> #include <linux/uaccess.h> #include <asm/mmu_context.h> #include <asm/cacheflush.h> @@ -142,6 +143,12 @@ good_area: } up_read(&mm->mmap_sem); + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); + if (flags & VM_FAULT_MAJOR) + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, address); + else if (flags & VM_FAULT_MINOR) + perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, address); + return; /* Something tried to access memory that isn't in our memory map.. diff --git a/arch/xtensa/oprofile/backtrace.c b/arch/xtensa/oprofile/backtrace.c index 5f03a593d84f..8f952034e161 100644 --- a/arch/xtensa/oprofile/backtrace.c +++ b/arch/xtensa/oprofile/backtrace.c @@ -2,168 +2,26 @@ * @file backtrace.c * * @remark Copyright 2008 Tensilica Inc. + * Copyright (C) 2015 Cadence Design Systems Inc. * @remark Read the file COPYING * */ #include <linux/oprofile.h> -#include <linux/sched.h> -#include <linux/mm.h> #include <asm/ptrace.h> -#include <asm/uaccess.h> -#include <asm/traps.h> +#include <asm/stacktrace.h> -/* Address of common_exception_return, used to check the - * transition from kernel to user space. - */ -extern int common_exception_return; - -/* A struct that maps to the part of the frame containing the a0 and - * a1 registers. - */ -struct frame_start { - unsigned long a0; - unsigned long a1; -}; - -static void xtensa_backtrace_user(struct pt_regs *regs, unsigned int depth) -{ - unsigned long windowstart = regs->windowstart; - unsigned long windowbase = regs->windowbase; - unsigned long a0 = regs->areg[0]; - unsigned long a1 = regs->areg[1]; - unsigned long pc = MAKE_PC_FROM_RA(a0, regs->pc); - int index; - - /* First add the current PC to the trace. */ - if (pc != 0 && pc <= TASK_SIZE) - oprofile_add_trace(pc); - else - return; - - /* Two steps: - * - * 1. Look through the register window for the - * previous PCs in the call trace. - * - * 2. Look on the stack. - */ - - /* Step 1. */ - /* Rotate WINDOWSTART to move the bit corresponding to - * the current window to the bit #0. - */ - windowstart = (windowstart << WSBITS | windowstart) >> windowbase; - - /* Look for bits that are set, they correspond to - * valid windows. - */ - for (index = WSBITS - 1; (index > 0) && depth; depth--, index--) - if (windowstart & (1 << index)) { - /* Read a0 and a1 from the - * corresponding position in AREGs. - */ - a0 = regs->areg[index * 4]; - a1 = regs->areg[index * 4 + 1]; - /* Get the PC from a0 and a1. */ - pc = MAKE_PC_FROM_RA(a0, pc); - - /* Add the PC to the trace. */ - if (pc != 0 && pc <= TASK_SIZE) - oprofile_add_trace(pc); - else - return; - } - - /* Step 2. */ - /* We are done with the register window, we need to - * look through the stack. - */ - if (depth > 0) { - /* Start from the a1 register. */ - /* a1 = regs->areg[1]; */ - while (a0 != 0 && depth--) { - - struct frame_start frame_start; - /* Get the location for a1, a0 for the - * previous frame from the current a1. - */ - unsigned long *psp = (unsigned long *)a1; - psp -= 4; - - /* Check if the region is OK to access. */ - if (!access_ok(VERIFY_READ, psp, sizeof(frame_start))) - return; - /* Copy a1, a0 from user space stack frame. */ - if (__copy_from_user_inatomic(&frame_start, psp, - sizeof(frame_start))) - return; - - a0 = frame_start.a0; - a1 = frame_start.a1; - pc = MAKE_PC_FROM_RA(a0, pc); - - if (pc != 0 && pc <= TASK_SIZE) - oprofile_add_trace(pc); - else - return; - } - } -} - -static void xtensa_backtrace_kernel(struct pt_regs *regs, unsigned int depth) +static int xtensa_backtrace_cb(struct stackframe *frame, void *data) { - unsigned long pc = regs->pc; - unsigned long *psp; - unsigned long sp_start, sp_end; - unsigned long a0 = regs->areg[0]; - unsigned long a1 = regs->areg[1]; - - sp_start = a1 & ~(THREAD_SIZE-1); - sp_end = sp_start + THREAD_SIZE; - - /* Spill the register window to the stack first. */ - spill_registers(); - - /* Read the stack frames one by one and create the PC - * from the a0 and a1 registers saved there. - */ - while (a1 > sp_start && a1 < sp_end && depth--) { - pc = MAKE_PC_FROM_RA(a0, pc); - - /* Add the PC to the trace. */ - oprofile_add_trace(pc); - if (pc == (unsigned long) &common_exception_return) { - regs = (struct pt_regs *)a1; - if (user_mode(regs)) { - pc = regs->pc; - if (pc != 0 && pc <= TASK_SIZE) - oprofile_add_trace(pc); - else - return; - return xtensa_backtrace_user(regs, depth); - } - a0 = regs->areg[0]; - a1 = regs->areg[1]; - continue; - } - - psp = (unsigned long *)a1; - - a0 = *(psp - 4); - a1 = *(psp - 3); - - if (a1 <= (unsigned long)psp) - return; - - } - return; + oprofile_add_trace(frame->pc); + return 0; } void xtensa_backtrace(struct pt_regs * const regs, unsigned int depth) { if (user_mode(regs)) - xtensa_backtrace_user(regs, depth); + xtensa_backtrace_user(regs, depth, xtensa_backtrace_cb, NULL); else - xtensa_backtrace_kernel(regs, depth); + xtensa_backtrace_kernel(regs, depth, xtensa_backtrace_cb, + xtensa_backtrace_cb, NULL); } diff --git a/arch/xtensa/platforms/iss/network.c b/arch/xtensa/platforms/iss/network.c index 8ab021b1f141..976a38594537 100644 --- a/arch/xtensa/platforms/iss/network.c +++ b/arch/xtensa/platforms/iss/network.c @@ -105,13 +105,17 @@ static char *split_if_spec(char *str, ...) va_start(ap, str); while ((arg = va_arg(ap, char**)) != NULL) { - if (*str == '\0') + if (*str == '\0') { + va_end(ap); return NULL; + } end = strchr(str, ','); if (end != str) *arg = str; - if (end == NULL) + if (end == NULL) { + va_end(ap); return NULL; + } *end++ = '\0'; str = end; } diff --git a/arch/xtensa/platforms/iss/simdisk.c b/arch/xtensa/platforms/iss/simdisk.c index 48eebacdf5fe..fa84ca990caa 100644 --- a/arch/xtensa/platforms/iss/simdisk.c +++ b/arch/xtensa/platforms/iss/simdisk.c @@ -101,8 +101,9 @@ static void simdisk_transfer(struct simdisk *dev, unsigned long sector, spin_unlock(&dev->lock); } -static int simdisk_xfer_bio(struct simdisk *dev, struct bio *bio) +static void simdisk_make_request(struct request_queue *q, struct bio *bio) { + struct simdisk *dev = q->queuedata; struct bio_vec bvec; struct bvec_iter iter; sector_t sector = bio->bi_iter.bi_sector; @@ -116,17 +117,10 @@ static int simdisk_xfer_bio(struct simdisk *dev, struct bio *bio) sector += len; __bio_kunmap_atomic(buffer); } - return 0; -} -static void simdisk_make_request(struct request_queue *q, struct bio *bio) -{ - struct simdisk *dev = q->queuedata; - int status = simdisk_xfer_bio(dev, bio); - bio_endio(bio, status); + bio_endio(bio); } - static int simdisk_open(struct block_device *bdev, fmode_t mode) { struct simdisk *dev = bdev->bd_disk->private_data; |