diff options
Diffstat (limited to 'arch/tile')
| -rw-r--r-- | arch/tile/Kconfig | 1 | ||||
| -rw-r--r-- | arch/tile/include/asm/insn.h | 59 | ||||
| -rw-r--r-- | arch/tile/include/asm/io.h | 16 | ||||
| -rw-r--r-- | arch/tile/include/asm/jump_label.h | 58 | ||||
| -rw-r--r-- | arch/tile/include/asm/page.h | 10 | ||||
| -rw-r--r-- | arch/tile/include/asm/processor.h | 2 | ||||
| -rw-r--r-- | arch/tile/include/asm/thread_info.h | 8 | ||||
| -rw-r--r-- | arch/tile/include/asm/topology.h | 3 | ||||
| -rw-r--r-- | arch/tile/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/tile/kernel/ftrace.c | 13 | ||||
| -rw-r--r-- | arch/tile/kernel/intvec_32.S | 51 | ||||
| -rw-r--r-- | arch/tile/kernel/intvec_64.S | 56 | ||||
| -rw-r--r-- | arch/tile/kernel/jump_label.c | 64 | ||||
| -rw-r--r-- | arch/tile/kernel/kgdb.c | 2 | ||||
| -rw-r--r-- | arch/tile/kernel/kprobes.c | 4 | ||||
| -rw-r--r-- | arch/tile/kernel/process.c | 79 | ||||
| -rw-r--r-- | arch/tile/kernel/ptrace.c | 15 | ||||
| -rw-r--r-- | arch/tile/kernel/setup.c | 2 | ||||
| -rw-r--r-- | arch/tile/kernel/single_step.c | 3 | ||||
| -rw-r--r-- | arch/tile/kernel/stack.c | 17 | ||||
| -rw-r--r-- | arch/tile/kernel/traps.c | 13 | ||||
| -rw-r--r-- | arch/tile/kernel/unaligned.c | 13 | ||||
| -rw-r--r-- | arch/tile/mm/fault.c | 3 |
23 files changed, 309 insertions, 184 deletions
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig index be05b4ae02b6..6bfbe8b71e7e 100644 --- a/arch/tile/Kconfig +++ b/arch/tile/Kconfig @@ -141,6 +141,7 @@ config TILEGX select HAVE_KRETPROBES select HAVE_ARCH_KGDB select ARCH_SUPPORTS_ATOMIC_RMW + select HAVE_ARCH_JUMP_LABEL config TILEPRO def_bool !TILEGX diff --git a/arch/tile/include/asm/insn.h b/arch/tile/include/asm/insn.h new file mode 100644 index 000000000000..f78ba5c16722 --- /dev/null +++ b/arch/tile/include/asm/insn.h @@ -0,0 +1,59 @@ +/* + * Copyright 2015 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ +#ifndef __ASM_TILE_INSN_H +#define __ASM_TILE_INSN_H + +#include <arch/opcode.h> + +static inline tilegx_bundle_bits NOP(void) +{ + return create_UnaryOpcodeExtension_X0(FNOP_UNARY_OPCODE_X0) | + create_RRROpcodeExtension_X0(UNARY_RRR_0_OPCODE_X0) | + create_Opcode_X0(RRR_0_OPCODE_X0) | + create_UnaryOpcodeExtension_X1(NOP_UNARY_OPCODE_X1) | + create_RRROpcodeExtension_X1(UNARY_RRR_0_OPCODE_X1) | + create_Opcode_X1(RRR_0_OPCODE_X1); +} + +static inline tilegx_bundle_bits tilegx_gen_branch(unsigned long pc, + unsigned long addr, + bool link) +{ + tilegx_bundle_bits opcode_x0, opcode_x1; + long pcrel_by_instr = (addr - pc) >> TILEGX_LOG2_BUNDLE_SIZE_IN_BYTES; + + if (link) { + /* opcode: jal addr */ + opcode_x1 = + create_Opcode_X1(JUMP_OPCODE_X1) | + create_JumpOpcodeExtension_X1(JAL_JUMP_OPCODE_X1) | + create_JumpOff_X1(pcrel_by_instr); + } else { + /* opcode: j addr */ + opcode_x1 = + create_Opcode_X1(JUMP_OPCODE_X1) | + create_JumpOpcodeExtension_X1(J_JUMP_OPCODE_X1) | + create_JumpOff_X1(pcrel_by_instr); + } + + /* opcode: fnop */ + opcode_x0 = + create_UnaryOpcodeExtension_X0(FNOP_UNARY_OPCODE_X0) | + create_RRROpcodeExtension_X0(UNARY_RRR_0_OPCODE_X0) | + create_Opcode_X0(RRR_0_OPCODE_X0); + + return opcode_x1 | opcode_x0; +} + +#endif /* __ASM_TILE_INSN_H */ diff --git a/arch/tile/include/asm/io.h b/arch/tile/include/asm/io.h index 322b5fe94781..30f4a210d148 100644 --- a/arch/tile/include/asm/io.h +++ b/arch/tile/include/asm/io.h @@ -161,14 +161,14 @@ extern void _tile_writew(u16 val, unsigned long addr); extern void _tile_writel(u32 val, unsigned long addr); extern void _tile_writeq(u64 val, unsigned long addr); -#define __raw_readb(addr) _tile_readb((unsigned long)addr) -#define __raw_readw(addr) _tile_readw((unsigned long)addr) -#define __raw_readl(addr) _tile_readl((unsigned long)addr) -#define __raw_readq(addr) _tile_readq((unsigned long)addr) -#define __raw_writeb(val, addr) _tile_writeb(val, (unsigned long)addr) -#define __raw_writew(val, addr) _tile_writew(val, (unsigned long)addr) -#define __raw_writel(val, addr) _tile_writel(val, (unsigned long)addr) -#define __raw_writeq(val, addr) _tile_writeq(val, (unsigned long)addr) +#define __raw_readb(addr) _tile_readb((unsigned long)(addr)) +#define __raw_readw(addr) _tile_readw((unsigned long)(addr)) +#define __raw_readl(addr) _tile_readl((unsigned long)(addr)) +#define __raw_readq(addr) _tile_readq((unsigned long)(addr)) +#define __raw_writeb(val, addr) _tile_writeb(val, (unsigned long)(addr)) +#define __raw_writew(val, addr) _tile_writew(val, (unsigned long)(addr)) +#define __raw_writel(val, addr) _tile_writel(val, (unsigned long)(addr)) +#define __raw_writeq(val, addr) _tile_writeq(val, (unsigned long)(addr)) #else /* CONFIG_PCI */ diff --git a/arch/tile/include/asm/jump_label.h b/arch/tile/include/asm/jump_label.h new file mode 100644 index 000000000000..cde7573f397b --- /dev/null +++ b/arch/tile/include/asm/jump_label.h @@ -0,0 +1,58 @@ +/* + * Copyright 2015 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#ifndef _ASM_TILE_JUMP_LABEL_H +#define _ASM_TILE_JUMP_LABEL_H + +#include <arch/opcode.h> + +#define JUMP_LABEL_NOP_SIZE TILE_BUNDLE_SIZE_IN_BYTES + +static __always_inline bool arch_static_branch(struct static_key *key, + bool branch) +{ + asm_volatile_goto("1:\n\t" + "nop" "\n\t" + ".pushsection __jump_table, \"aw\"\n\t" + ".quad 1b, %l[l_yes], %0 + %1 \n\t" + ".popsection\n\t" + : : "i" (key), "i" (branch) : : l_yes); + return false; +l_yes: + return true; +} + +static __always_inline bool arch_static_branch_jump(struct static_key *key, + bool branch) +{ + asm_volatile_goto("1:\n\t" + "j %l[l_yes]" "\n\t" + ".pushsection __jump_table, \"aw\"\n\t" + ".quad 1b, %l[l_yes], %0 + %1 \n\t" + ".popsection\n\t" + : : "i" (key), "i" (branch) : : l_yes); + return false; +l_yes: + return true; +} + +typedef u64 jump_label_t; + +struct jump_entry { + jump_label_t code; + jump_label_t target; + jump_label_t key; +}; + +#endif /* _ASM_TILE_JUMP_LABEL_H */ diff --git a/arch/tile/include/asm/page.h b/arch/tile/include/asm/page.h index 8eca6a0e1762..498a5f71245d 100644 --- a/arch/tile/include/asm/page.h +++ b/arch/tile/include/asm/page.h @@ -321,6 +321,16 @@ static inline int pfn_valid(unsigned long pfn) #define virt_to_page(kaddr) pfn_to_page(kaddr_to_pfn((void *)(kaddr))) #define page_to_virt(page) pfn_to_kaddr(page_to_pfn(page)) +/* + * The kernel text is mapped at MEM_SV_START as read-only. To allow + * modifying kernel text, it is also mapped at PAGE_OFFSET as read-write. + * This macro converts a kernel address to its writable kernel text mapping, + * which is used to modify the text code on a running kernel by kgdb, + * ftrace, kprobe, jump label, etc. + */ +#define ktext_writable_addr(kaddr) \ + ((unsigned long)(kaddr) - MEM_SV_START + PAGE_OFFSET) + struct mm_struct; extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr); extern pte_t *virt_to_kpte(unsigned long kaddr); diff --git a/arch/tile/include/asm/processor.h b/arch/tile/include/asm/processor.h index 139dfdee0134..0684e88aacd8 100644 --- a/arch/tile/include/asm/processor.h +++ b/arch/tile/include/asm/processor.h @@ -212,7 +212,7 @@ static inline void release_thread(struct task_struct *dead_task) /* Nothing for now */ } -extern int do_work_pending(struct pt_regs *regs, u32 flags); +extern void prepare_exit_to_usermode(struct pt_regs *regs, u32 flags); /* diff --git a/arch/tile/include/asm/thread_info.h b/arch/tile/include/asm/thread_info.h index dc1fb28d9636..4b7cef9e94e0 100644 --- a/arch/tile/include/asm/thread_info.h +++ b/arch/tile/include/asm/thread_info.h @@ -140,10 +140,14 @@ extern void _cpu_idle(void); #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) #define _TIF_NOHZ (1<<TIF_NOHZ) +/* Work to do as we loop to exit to user space. */ +#define _TIF_WORK_MASK \ + (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ + _TIF_ASYNC_TLB | _TIF_NOTIFY_RESUME) + /* Work to do on any return to user space. */ #define _TIF_ALLWORK_MASK \ - (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_SINGLESTEP | \ - _TIF_ASYNC_TLB | _TIF_NOTIFY_RESUME | _TIF_NOHZ) + (_TIF_WORK_MASK | _TIF_SINGLESTEP | _TIF_NOHZ) /* Work to do at syscall entry. */ #define _TIF_SYSCALL_ENTRY_WORK \ diff --git a/arch/tile/include/asm/topology.h b/arch/tile/include/asm/topology.h index 76b0d0ebb244..b11d5fcd2c41 100644 --- a/arch/tile/include/asm/topology.h +++ b/arch/tile/include/asm/topology.h @@ -44,9 +44,6 @@ static inline const struct cpumask *cpumask_of_node(int node) /* For now, use numa node -1 for global allocation. */ #define pcibus_to_node(bus) ((void)(bus), -1) -/* By definition, we create nodes based on online memory. */ -#define node_has_online_mem(nid) 1 - #endif /* CONFIG_NUMA */ #include <asm-generic/topology.h> diff --git a/arch/tile/kernel/Makefile b/arch/tile/kernel/Makefile index 21f77bf68c69..09936d0bcb42 100644 --- a/arch/tile/kernel/Makefile +++ b/arch/tile/kernel/Makefile @@ -32,5 +32,6 @@ obj-$(CONFIG_TILE_HVGLUE_TRACE) += hvglue_trace.o obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o mcount_64.o obj-$(CONFIG_KPROBES) += kprobes.o obj-$(CONFIG_KGDB) += kgdb.o +obj-$(CONFIG_JUMP_LABEL) += jump_label.o obj-y += vdso/ diff --git a/arch/tile/kernel/ftrace.c b/arch/tile/kernel/ftrace.c index 0c0996175b1e..4a572088b270 100644 --- a/arch/tile/kernel/ftrace.c +++ b/arch/tile/kernel/ftrace.c @@ -20,21 +20,12 @@ #include <asm/cacheflush.h> #include <asm/ftrace.h> #include <asm/sections.h> +#include <asm/insn.h> #include <arch/opcode.h> #ifdef CONFIG_DYNAMIC_FTRACE -static inline tilegx_bundle_bits NOP(void) -{ - return create_UnaryOpcodeExtension_X0(FNOP_UNARY_OPCODE_X0) | - create_RRROpcodeExtension_X0(UNARY_RRR_0_OPCODE_X0) | - create_Opcode_X0(RRR_0_OPCODE_X0) | - create_UnaryOpcodeExtension_X1(NOP_UNARY_OPCODE_X1) | - create_RRROpcodeExtension_X1(UNARY_RRR_0_OPCODE_X1) | - create_Opcode_X1(RRR_0_OPCODE_X1); -} - static int machine_stopped __read_mostly; int ftrace_arch_code_modify_prepare(void) @@ -117,7 +108,7 @@ static int ftrace_modify_code(unsigned long pc, unsigned long old, return -EINVAL; /* Operate on writable kernel text mapping. */ - pc_wr = pc - MEM_SV_START + PAGE_OFFSET; + pc_wr = ktext_writable_addr(pc); if (probe_kernel_write((void *)pc_wr, &new, MCOUNT_INSN_SIZE)) return -EPERM; diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S index fbbe2ea882ea..9ff75e3a318a 100644 --- a/arch/tile/kernel/intvec_32.S +++ b/arch/tile/kernel/intvec_32.S @@ -572,7 +572,7 @@ intvec_\vecname: } wh64 r52 -#ifdef CONFIG_TRACE_IRQFLAGS +#if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING) .ifnc \function,handle_nmi /* * We finally have enough state set up to notify the irq @@ -588,6 +588,9 @@ intvec_\vecname: { move r32, r2; move r33, r3 } .endif TRACE_IRQS_OFF +#ifdef CONFIG_CONTEXT_TRACKING + jal context_tracking_user_exit +#endif .ifnc \function,handle_syscall { move r0, r30; move r1, r31 } { move r2, r32; move r3, r33 } @@ -846,18 +849,6 @@ STD_ENTRY(interrupt_return) FEEDBACK_REENTER(interrupt_return) /* - * Use r33 to hold whether we have already loaded the callee-saves - * into ptregs. We don't want to do it twice in this loop, since - * then we'd clobber whatever changes are made by ptrace, etc. - * Get base of stack in r32. - */ - { - GET_THREAD_INFO(r32) - movei r33, 0 - } - -.Lretry_work_pending: - /* * Disable interrupts so as to make sure we don't * miss an interrupt that sets any of the thread flags (like * need_resched or sigpending) between sampling and the iret. @@ -867,33 +858,27 @@ STD_ENTRY(interrupt_return) IRQ_DISABLE(r20, r21) TRACE_IRQS_OFF /* Note: clobbers registers r0-r29 */ - - /* Check to see if there is any work to do before returning to user. */ + /* + * See if there are any work items (including single-shot items) + * to do. If so, save the callee-save registers to pt_regs + * and then dispatch to C code. + */ + GET_THREAD_INFO(r21) { - addi r29, r32, THREAD_INFO_FLAGS_OFFSET - moveli r1, lo16(_TIF_ALLWORK_MASK) + addi r22, r21, THREAD_INFO_FLAGS_OFFSET + moveli r20, lo16(_TIF_ALLWORK_MASK) } { - lw r29, r29 - auli r1, r1, ha16(_TIF_ALLWORK_MASK) + lw r22, r22 + auli r20, r20, ha16(_TIF_ALLWORK_MASK) } - and r1, r29, r1 - bzt r1, .Lrestore_all - - /* - * Make sure we have all the registers saved for signal - * handling, notify-resume, or single-step. Call out to C - * code to figure out exactly what we need to do for each flag bit, - * then if necessary, reload the flags and recheck. - */ + and r1, r22, r20 { PTREGS_PTR(r0, PTREGS_OFFSET_BASE) - bnz r33, 1f + bzt r1, .Lrestore_all } push_extra_callee_saves r0 - movei r33, 1 -1: jal do_work_pending - bnz r0, .Lretry_work_pending + jal prepare_exit_to_usermode /* * In the NMI case we @@ -1327,7 +1312,7 @@ STD_ENTRY(ret_from_kernel_thread) FEEDBACK_REENTER(ret_from_kernel_thread) { movei r30, 0 /* not an NMI */ - j .Lresume_userspace /* jump into middle of interrupt_return */ + j interrupt_return } STD_ENDPROC(ret_from_kernel_thread) diff --git a/arch/tile/kernel/intvec_64.S b/arch/tile/kernel/intvec_64.S index 58964d209d4d..3b51bdf37d11 100644 --- a/arch/tile/kernel/intvec_64.S +++ b/arch/tile/kernel/intvec_64.S @@ -658,7 +658,7 @@ intvec_\vecname: */ mfspr r32, SPR_EX_CONTEXT_K_1 { - IS_KERNEL_EX1(r22, r22) + IS_KERNEL_EX1(r32, r32) PTREGS_PTR(r21, PTREGS_OFFSET_FLAGS) } beqzt r32, 1f /* zero if from user space */ @@ -753,7 +753,7 @@ intvec_\vecname: } wh64 r52 -#ifdef CONFIG_TRACE_IRQFLAGS +#if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING) .ifnc \function,handle_nmi /* * We finally have enough state set up to notify the irq @@ -769,6 +769,9 @@ intvec_\vecname: { move r32, r2; move r33, r3 } .endif TRACE_IRQS_OFF +#ifdef CONFIG_CONTEXT_TRACKING + jal context_tracking_user_exit +#endif .ifnc \function,handle_syscall { move r0, r30; move r1, r31 } { move r2, r32; move r3, r33 } @@ -879,20 +882,6 @@ STD_ENTRY(interrupt_return) FEEDBACK_REENTER(interrupt_return) /* - * Use r33 to hold whether we have already loaded the callee-saves - * into ptregs. We don't want to do it twice in this loop, since - * then we'd clobber whatever changes are made by ptrace, etc. - */ - { - movei r33, 0 - move r32, sp - } - - /* Get base of stack in r32. */ - EXTRACT_THREAD_INFO(r32) - -.Lretry_work_pending: - /* * Disable interrupts so as to make sure we don't * miss an interrupt that sets any of the thread flags (like * need_resched or sigpending) between sampling and the iret. @@ -902,33 +891,28 @@ STD_ENTRY(interrupt_return) IRQ_DISABLE(r20, r21) TRACE_IRQS_OFF /* Note: clobbers registers r0-r29 */ - - /* Check to see if there is any work to do before returning to user. */ + /* + * See if there are any work items (including single-shot items) + * to do. If so, save the callee-save registers to pt_regs + * and then dispatch to C code. + */ + move r21, sp + EXTRACT_THREAD_INFO(r21) { - addi r29, r32, THREAD_INFO_FLAGS_OFFSET - moveli r1, hw1_last(_TIF_ALLWORK_MASK) + addi r22, r21, THREAD_INFO_FLAGS_OFFSET + moveli r20, hw1_last(_TIF_ALLWORK_MASK) } { - ld r29, r29 - shl16insli r1, r1, hw0(_TIF_ALLWORK_MASK) + ld r22, r22 + shl16insli r20, r20, hw0(_TIF_ALLWORK_MASK) } - and r1, r29, r1 - beqzt r1, .Lrestore_all - - /* - * Make sure we have all the registers saved for signal - * handling or notify-resume. Call out to C code to figure out - * exactly what we need to do for each flag bit, then if - * necessary, reload the flags and recheck. - */ + and r1, r22, r20 { PTREGS_PTR(r0, PTREGS_OFFSET_BASE) - bnez r33, 1f + beqzt r1, .Lrestore_all } push_extra_callee_saves r0 - movei r33, 1 -1: jal do_work_pending - bnez r0, .Lretry_work_pending + jal prepare_exit_to_usermode /* * In the NMI case we @@ -1411,7 +1395,7 @@ STD_ENTRY(ret_from_kernel_thread) FEEDBACK_REENTER(ret_from_kernel_thread) { movei r30, 0 /* not an NMI */ - j .Lresume_userspace /* jump into middle of interrupt_return */ + j interrupt_return } STD_ENDPROC(ret_from_kernel_thread) diff --git a/arch/tile/kernel/jump_label.c b/arch/tile/kernel/jump_label.c new file mode 100644 index 000000000000..07802d586988 --- /dev/null +++ b/arch/tile/kernel/jump_label.c @@ -0,0 +1,64 @@ +/* + * Copyright 2015 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + * + * jump label TILE-Gx support + */ + +#include <linux/jump_label.h> +#include <linux/memory.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/cpu.h> + +#include <asm/cacheflush.h> +#include <asm/insn.h> + +#ifdef HAVE_JUMP_LABEL + +static void __jump_label_transform(struct jump_entry *e, + enum jump_label_type type) +{ + tilegx_bundle_bits opcode; + /* Operate on writable kernel text mapping. */ + unsigned long pc_wr = ktext_writable_addr(e->code); + + if (type == JUMP_LABEL_JMP) + opcode = tilegx_gen_branch(e->code, e->target, false); + else + opcode = NOP(); + + *(tilegx_bundle_bits *)pc_wr = opcode; + /* Make sure that above mem writes were issued towards the memory. */ + smp_wmb(); +} + +void arch_jump_label_transform(struct jump_entry *e, + enum jump_label_type type) +{ + get_online_cpus(); + mutex_lock(&text_mutex); + + __jump_label_transform(e, type); + flush_icache_range(e->code, e->code + sizeof(tilegx_bundle_bits)); + + mutex_unlock(&text_mutex); + put_online_cpus(); +} + +__init_or_module void arch_jump_label_transform_static(struct jump_entry *e, + enum jump_label_type type) +{ + __jump_label_transform(e, type); +} + +#endif /* HAVE_JUMP_LABEL */ diff --git a/arch/tile/kernel/kgdb.c b/arch/tile/kernel/kgdb.c index ff5335ae050d..a506c2c28943 100644 --- a/arch/tile/kernel/kgdb.c +++ b/arch/tile/kernel/kgdb.c @@ -164,7 +164,7 @@ static unsigned long writable_address(unsigned long addr) unsigned long ret = 0; if (core_kernel_text(addr)) - ret = addr - MEM_SV_START + PAGE_OFFSET; + ret = ktext_writable_addr(addr); else if (is_module_text_address(addr)) ret = addr; else diff --git a/arch/tile/kernel/kprobes.c b/arch/tile/kernel/kprobes.c index f8a45c51e9e4..c68694bb1ad2 100644 --- a/arch/tile/kernel/kprobes.c +++ b/arch/tile/kernel/kprobes.c @@ -116,7 +116,7 @@ void __kprobes arch_arm_kprobe(struct kprobe *p) unsigned long addr_wr; /* Operate on writable kernel text mapping. */ - addr_wr = (unsigned long)p->addr - MEM_SV_START + PAGE_OFFSET; + addr_wr = ktext_writable_addr(p->addr); if (probe_kernel_write((void *)addr_wr, &breakpoint_insn, sizeof(breakpoint_insn))) @@ -131,7 +131,7 @@ void __kprobes arch_disarm_kprobe(struct kprobe *kp) unsigned long addr_wr; /* Operate on writable kernel text mapping. */ - addr_wr = (unsigned long)kp->addr - MEM_SV_START + PAGE_OFFSET; + addr_wr = ktext_writable_addr(kp->addr); if (probe_kernel_write((void *)addr_wr, &kp->opcode, sizeof(kp->opcode))) diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c index 7d5769310bef..b5f30d376ce1 100644 --- a/arch/tile/kernel/process.c +++ b/arch/tile/kernel/process.c @@ -462,54 +462,57 @@ struct task_struct *__sched _switch_to(struct task_struct *prev, /* * This routine is called on return from interrupt if any of the - * TIF_WORK_MASK flags are set in thread_info->flags. It is - * entered with interrupts disabled so we don't miss an event - * that modified the thread_info flags. If any flag is set, we - * handle it and return, and the calling assembly code will - * re-disable interrupts, reload the thread flags, and call back - * if more flags need to be handled. - * - * We return whether we need to check the thread_info flags again - * or not. Note that we don't clear TIF_SINGLESTEP here, so it's - * important that it be tested last, and then claim that we don't - * need to recheck the flags. + * TIF_ALLWORK_MASK flags are set in thread_info->flags. It is + * entered with interrupts disabled so we don't miss an event that + * modified the thread_info flags. We loop until all the tested flags + * are clear. Note that the function is called on certain conditions + * that are not listed in the loop condition here (e.g. SINGLESTEP) + * which guarantees we will do those things once, and redo them if any + * of the other work items is re-done, but won't continue looping if + * all the other work is done. */ -int do_work_pending(struct pt_regs *regs, u32 thread_info_flags) +void prepare_exit_to_usermode(struct pt_regs *regs, u32 thread_info_flags) { - /* If we enter in kernel mode, do nothing and exit the caller loop. */ - if (!user_mode(regs)) - return 0; + if (WARN_ON(!user_mode(regs))) + return; - user_exit(); + do { + local_irq_enable(); - /* Enable interrupts; they are disabled again on return to caller. */ - local_irq_enable(); + if (thread_info_flags & _TIF_NEED_RESCHED) + schedule(); - if (thread_info_flags & _TIF_NEED_RESCHED) { - schedule(); - return 1; - } #if CHIP_HAS_TILE_DMA() - if (thread_info_flags & _TIF_ASYNC_TLB) { - do_async_page_fault(regs); - return 1; - } + if (thread_info_flags & _TIF_ASYNC_TLB) + do_async_page_fault(regs); #endif - if (thread_info_flags & _TIF_SIGPENDING) { - do_signal(regs); - return 1; - } - if (thread_info_flags & _TIF_NOTIFY_RESUME) { - clear_thread_flag(TIF_NOTIFY_RESUME); - tracehook_notify_resume(regs); - return 1; - } - if (thread_info_flags & _TIF_SINGLESTEP) + + if (thread_info_flags & _TIF_SIGPENDING) + do_signal(regs); + + if (thread_info_flags & _TIF_NOTIFY_RESUME) { + clear_thread_flag(TIF_NOTIFY_RESUME); + tracehook_notify_resume(regs); + } + + local_irq_disable(); + thread_info_flags = READ_ONCE(current_thread_info()->flags); + + } while (thread_info_flags & _TIF_WORK_MASK); + + if (thread_info_flags & _TIF_SINGLESTEP) { single_step_once(regs); +#ifndef __tilegx__ + /* + * FIXME: on tilepro, since we enable interrupts in + * this routine, it's possible that we miss a signal + * or other asynchronous event. + */ + local_irq_disable(); +#endif + } user_enter(); - - return 0; } unsigned long get_wchan(struct task_struct *p) diff --git a/arch/tile/kernel/ptrace.c b/arch/tile/kernel/ptrace.c index bdc126faf741..54e7b723db99 100644 --- a/arch/tile/kernel/ptrace.c +++ b/arch/tile/kernel/ptrace.c @@ -255,13 +255,6 @@ int do_syscall_trace_enter(struct pt_regs *regs) { u32 work = ACCESS_ONCE(current_thread_info()->flags); - /* - * If TIF_NOHZ is set, we are required to call user_exit() before - * doing anything that could touch RCU. - */ - if (work & _TIF_NOHZ) - user_exit(); - if (secure_computing() == -1) return -1; @@ -281,12 +274,6 @@ void do_syscall_trace_exit(struct pt_regs *regs) long errno; /* - * We may come here right after calling schedule_user() - * in which case we can be in RCU user mode. - */ - user_exit(); - - /* * The standard tile calling convention returns the value (or negative * errno) in r0, and zero (or positive errno) in r1. * It saves a couple of cycles on the hot path to do this work in @@ -322,7 +309,5 @@ void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs) /* Handle synthetic interrupt delivered only by the simulator. */ void __kprobes do_breakpoint(struct pt_regs* regs, int fault_num) { - enum ctx_state prev_state = exception_enter(); send_sigtrap(current, regs); - exception_exit(prev_state); } diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c index 6b755d125783..bbb855de6569 100644 --- a/arch/tile/kernel/setup.c +++ b/arch/tile/kernel/setup.c @@ -882,7 +882,7 @@ static int __init node_neighbors(int node, int cpu, static void __init setup_numa_mapping(void) { - int distance[MAX_NUMNODES][NR_CPUS]; + u8 distance[MAX_NUMNODES][NR_CPUS]; HV_Coord coord; int cpu, node, cpus, i, x, y; int num_nodes = num_online_nodes(); diff --git a/arch/tile/kernel/single_step.c b/arch/tile/kernel/single_step.c index 53f7b9def07b..862973074bf9 100644 --- a/arch/tile/kernel/single_step.c +++ b/arch/tile/kernel/single_step.c @@ -23,7 +23,6 @@ #include <linux/types.h> #include <linux/err.h> #include <linux/prctl.h> -#include <linux/context_tracking.h> #include <asm/cacheflush.h> #include <asm/traps.h> #include <asm/uaccess.h> @@ -739,7 +738,6 @@ static DEFINE_PER_CPU(unsigned long, ss_saved_pc); void gx_singlestep_handle(struct pt_regs *regs, int fault_num) { - enum ctx_state prev_state = exception_enter(); unsigned long *ss_pc = this_cpu_ptr(&ss_saved_pc); struct thread_info *info = (void *)current_thread_info(); int is_single_step = test_ti_thread_flag(info, TIF_SINGLESTEP); @@ -756,7 +754,6 @@ void gx_singlestep_handle(struct pt_regs *regs, int fault_num) __insn_mtspr(SPR_SINGLE_STEP_CONTROL_K, control); send_sigtrap(current, regs); } - exception_exit(prev_state); } diff --git a/arch/tile/kernel/stack.c b/arch/tile/kernel/stack.c index 402b9c85a894..22bbbd3ff4a3 100644 --- a/arch/tile/kernel/stack.c +++ b/arch/tile/kernel/stack.c @@ -78,8 +78,7 @@ static bool read_memory_func(void *result, unsigned long address, /* Return a pt_regs pointer for a valid fault handler frame */ static struct pt_regs *valid_fault_handler(struct KBacktraceIterator* kbt) { - const char *fault = NULL; /* happy compiler */ - char fault_buf[64]; + char fault[64]; unsigned long sp = kbt->it.sp; struct pt_regs *p; @@ -90,14 +89,14 @@ static struct pt_regs *valid_fault_handler(struct KBacktraceIterator* kbt) if (!in_kernel_stack(kbt, sp + C_ABI_SAVE_AREA_SIZE + PTREGS_SIZE-1)) return NULL; p = (struct pt_regs *)(sp + C_ABI_SAVE_AREA_SIZE); - if (p->faultnum == INT_SWINT_1 || p->faultnum == INT_SWINT_1_SIGRETURN) - fault = "syscall"; - else { - if (kbt->verbose) { /* else we aren't going to use it */ - snprintf(fault_buf, sizeof(fault_buf), + if (kbt->verbose) { /* else we aren't going to use it */ + if (p->faultnum == INT_SWINT_1 || + p->faultnum == INT_SWINT_1_SIGRETURN) + snprintf(fault, sizeof(fault), + "syscall %ld", p->regs[TREG_SYSCALL_NR]); + else + snprintf(fault, sizeof(fault), "interrupt %ld", p->faultnum); - fault = fault_buf; - } } if (EX1_PL(p->ex1) == KERNEL_PL && __kernel_text_address(p->pc) && diff --git a/arch/tile/kernel/traps.c b/arch/tile/kernel/traps.c index 0011a9ff0525..4d9651c5b1ad 100644 --- a/arch/tile/kernel/traps.c +++ b/arch/tile/kernel/traps.c @@ -20,7 +20,6 @@ #include <linux/reboot.h> #include <linux/uaccess.h> #include <linux/ptrace.h> -#include <linux/context_tracking.h> #include <asm/stack.h> #include <asm/traps.h> #include <asm/setup.h> @@ -254,7 +253,6 @@ static int do_bpt(struct pt_regs *regs) void __kprobes do_trap(struct pt_regs *regs, int fault_num, unsigned long reason) { - enum ctx_state prev_state = exception_enter(); siginfo_t info = { 0 }; int signo, code; unsigned long address = 0; @@ -263,7 +261,7 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num, /* Handle breakpoints, etc. */ if (is_kernel && fault_num == INT_ILL && do_bpt(regs)) - goto done; + return; /* Re-enable interrupts, if they were previously enabled. */ if (!(regs->flags & PT_FLAGS_DISABLE_IRQ)) @@ -277,7 +275,7 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num, const char *name; char buf[100]; if (fixup_exception(regs)) /* ILL_TRANS or UNALIGN_DATA */ - goto done; + return; if (fault_num >= 0 && fault_num < ARRAY_SIZE(int_name) && int_name[fault_num] != NULL) @@ -319,7 +317,7 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num, case INT_GPV: #if CHIP_HAS_TILE_DMA() if (retry_gpv(reason)) - goto done; + return; #endif /*FALLTHROUGH*/ case INT_UDN_ACCESS: @@ -346,7 +344,7 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num, if (!state || (void __user *)(regs->pc) != state->buffer) { single_step_once(regs); - goto done; + return; } } #endif @@ -390,9 +388,6 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num, if (signo != SIGTRAP) trace_unhandled_signal("trap", regs, address, signo); force_sig_info(signo, &info, current); - -done: - exception_exit(prev_state); } void do_nmi(struct pt_regs *regs, int fault_num, unsigned long reason) diff --git a/arch/tile/kernel/unaligned.c b/arch/tile/kernel/unaligned.c index d075f92ccee0..0db5f7c9d9e5 100644 --- a/arch/tile/kernel/unaligned.c +++ b/arch/tile/kernel/unaligned.c @@ -25,7 +25,6 @@ #include <linux/module.h> #include <linux/compat.h> #include <linux/prctl.h> -#include <linux/context_tracking.h> #include <asm/cacheflush.h> #include <asm/traps.h> #include <asm/uaccess.h> @@ -1449,7 +1448,6 @@ void jit_bundle_gen(struct pt_regs *regs, tilegx_bundle_bits bundle, void do_unaligned(struct pt_regs *regs, int vecnum) { - enum ctx_state prev_state = exception_enter(); tilegx_bundle_bits __user *pc; tilegx_bundle_bits bundle; struct thread_info *info = current_thread_info(); @@ -1503,7 +1501,7 @@ void do_unaligned(struct pt_regs *regs, int vecnum) *((tilegx_bundle_bits *)(regs->pc))); jit_bundle_gen(regs, bundle, align_ctl); } - goto done; + return; } /* @@ -1527,7 +1525,7 @@ void do_unaligned(struct pt_regs *regs, int vecnum) trace_unhandled_signal("unaligned fixup trap", regs, 0, SIGBUS); force_sig_info(info.si_signo, &info, current); - goto done; + return; } @@ -1544,7 +1542,7 @@ void do_unaligned(struct pt_regs *regs, int vecnum) trace_unhandled_signal("segfault in unalign fixup", regs, (unsigned long)info.si_addr, SIGSEGV); force_sig_info(info.si_signo, &info, current); - goto done; + return; } if (!info->unalign_jit_base) { @@ -1579,7 +1577,7 @@ void do_unaligned(struct pt_regs *regs, int vecnum) if (IS_ERR((void __force *)user_page)) { pr_err("Out of kernel pages trying do_mmap\n"); - goto done; + return; } /* Save the address in the thread_info struct */ @@ -1592,9 +1590,6 @@ void do_unaligned(struct pt_regs *regs, int vecnum) /* Generate unalign JIT */ jit_bundle_gen(regs, GX_INSN_BSWAP(bundle), align_ctl); - -done: - exception_exit(prev_state); } #endif /* __tilegx__ */ diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c index 13eac59bf16a..26734214818c 100644 --- a/arch/tile/mm/fault.c +++ b/arch/tile/mm/fault.c @@ -35,7 +35,6 @@ #include <linux/syscalls.h> #include <linux/uaccess.h> #include <linux/kdebug.h> -#include <linux/context_tracking.h> #include <asm/pgalloc.h> #include <asm/sections.h> @@ -845,9 +844,7 @@ static inline void __do_page_fault(struct pt_regs *regs, int fault_num, void do_page_fault(struct pt_regs *regs, int fault_num, unsigned long address, unsigned long write) { - enum ctx_state prev_state = exception_enter(); __do_page_fault(regs, fault_num, address, write); - exception_exit(prev_state); } #if CHIP_HAS_TILE_DMA() |