diff options
Diffstat (limited to 'arch/sparc64/kernel')
| -rw-r--r-- | arch/sparc64/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/sparc64/kernel/ftrace.c | 94 | ||||
| -rw-r--r-- | arch/sparc64/kernel/smp.c | 13 | ||||
| -rw-r--r-- | arch/sparc64/kernel/sparc64_ksyms.c | 4 | ||||
| -rw-r--r-- | arch/sparc64/kernel/stacktrace.c | 2 | ||||
| -rw-r--r-- | arch/sparc64/kernel/time.c | 7 |
6 files changed, 110 insertions, 11 deletions
diff --git a/arch/sparc64/kernel/Makefile b/arch/sparc64/kernel/Makefile index ec4f5ebb1ca..418b5782096 100644 --- a/arch/sparc64/kernel/Makefile +++ b/arch/sparc64/kernel/Makefile @@ -14,6 +14,7 @@ obj-y := process.o setup.o cpu.o idprom.o \ power.o sbus.o sparc64_ksyms.o chmc.o \ visemul.o prom.o of_device.o hvapi.o sstate.o mdesc.o +obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-$(CONFIG_PCI) += ebus.o pci_common.o \ pci_psycho.o pci_sabre.o pci_schizo.o \ diff --git a/arch/sparc64/kernel/ftrace.c b/arch/sparc64/kernel/ftrace.c new file mode 100644 index 00000000000..4298d0aee71 --- /dev/null +++ b/arch/sparc64/kernel/ftrace.c @@ -0,0 +1,94 @@ +#include <linux/spinlock.h> +#include <linux/hardirq.h> +#include <linux/ftrace.h> +#include <linux/percpu.h> +#include <linux/init.h> +#include <linux/list.h> + +#include <asm/ftrace.h> + +static const u32 ftrace_nop = 0x01000000; + +notrace unsigned char *ftrace_nop_replace(void) +{ + return (char *)&ftrace_nop; +} + +notrace unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr) +{ + static u32 call; + s32 off; + + off = ((s32)addr - (s32)ip); + call = 0x40000000 | ((u32)off >> 2); + + return (unsigned char *) &call; +} + +notrace int +ftrace_modify_code(unsigned long ip, unsigned char *old_code, + unsigned char *new_code) +{ + u32 old = *(u32 *)old_code; + u32 new = *(u32 *)new_code; + u32 replaced; + int faulted; + + __asm__ __volatile__( + "1: cas [%[ip]], %[old], %[new]\n" + " flush %[ip]\n" + " mov 0, %[faulted]\n" + "2:\n" + " .section .fixup,#alloc,#execinstr\n" + " .align 4\n" + "3: sethi %%hi(2b), %[faulted]\n" + " jmpl %[faulted] + %%lo(2b), %%g0\n" + " mov 1, %[faulted]\n" + " .previous\n" + " .section __ex_table,\"a\"\n" + " .align 4\n" + " .word 1b, 3b\n" + " .previous\n" + : "=r" (replaced), [faulted] "=r" (faulted) + : [new] "0" (new), [old] "r" (old), [ip] "r" (ip) + : "memory"); + + if (replaced != old && replaced != new) + faulted = 2; + + return faulted; +} + +notrace int ftrace_update_ftrace_func(ftrace_func_t func) +{ + unsigned long ip = (unsigned long)(&ftrace_call); + unsigned char old[MCOUNT_INSN_SIZE], *new; + + memcpy(old, &ftrace_call, MCOUNT_INSN_SIZE); + new = ftrace_call_replace(ip, (unsigned long)func); + return ftrace_modify_code(ip, old, new); +} + +notrace int ftrace_mcount_set(unsigned long *data) +{ + unsigned long ip = (long)(&mcount_call); + unsigned long *addr = data; + unsigned char old[MCOUNT_INSN_SIZE], *new; + + /* + * Replace the mcount stub with a pointer to the + * ip recorder function. + */ + memcpy(old, &mcount_call, MCOUNT_INSN_SIZE); + new = ftrace_call_replace(ip, *addr); + *addr = ftrace_modify_code(ip, old, new); + + return 0; +} + + +int __init ftrace_dyn_arch_init(void *data) +{ + ftrace_mcount_set(data); + return 0; +} diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c index fa63c68a181..c099d96f123 100644 --- a/arch/sparc64/kernel/smp.c +++ b/arch/sparc64/kernel/smp.c @@ -807,7 +807,6 @@ extern unsigned long xcall_call_function; * smp_call_function(): Run a function on all other CPUs. * @func: The function to run. This must be fast and non-blocking. * @info: An arbitrary pointer to pass to the function. - * @nonatomic: currently unused. * @wait: If true, wait (atomically) until function has completed on other CPUs. * * Returns 0 on success, else a negative status code. Does not return until @@ -816,8 +815,8 @@ extern unsigned long xcall_call_function; * You must not call this function with disabled interrupts or from a * hardware interrupt handler or from a bottom half handler. */ -static int smp_call_function_mask(void (*func)(void *info), void *info, - int nonatomic, int wait, cpumask_t mask) +static int sparc64_smp_call_function_mask(void (*func)(void *info), void *info, + int wait, cpumask_t mask) { struct call_data_struct data; int cpus; @@ -852,11 +851,9 @@ out_unlock: return 0; } -int smp_call_function(void (*func)(void *info), void *info, - int nonatomic, int wait) +int smp_call_function(void (*func)(void *info), void *info, int wait) { - return smp_call_function_mask(func, info, nonatomic, wait, - cpu_online_map); + return sparc64_smp_call_function_mask(func, info, wait, cpu_online_map); } void smp_call_function_client(int irq, struct pt_regs *regs) @@ -893,7 +890,7 @@ static void tsb_sync(void *info) void smp_tsb_sync(struct mm_struct *mm) { - smp_call_function_mask(tsb_sync, mm, 0, 1, mm->cpu_vm_mask); + sparc64_smp_call_function_mask(tsb_sync, mm, 1, mm->cpu_vm_mask); } extern unsigned long xcall_flush_tlb_mm; diff --git a/arch/sparc64/kernel/sparc64_ksyms.c b/arch/sparc64/kernel/sparc64_ksyms.c index 8ac0b99f2c5..49d3ea50c24 100644 --- a/arch/sparc64/kernel/sparc64_ksyms.c +++ b/arch/sparc64/kernel/sparc64_ksyms.c @@ -53,6 +53,7 @@ #include <asm/ns87303.h> #include <asm/timer.h> #include <asm/cpudata.h> +#include <asm/ftrace.h> struct poll { int fd; @@ -111,8 +112,7 @@ EXPORT_SYMBOL(__write_trylock); EXPORT_SYMBOL(smp_call_function); #endif /* CONFIG_SMP */ -#if defined(CONFIG_MCOUNT) -extern void _mcount(void); +#ifdef CONFIG_MCOUNT EXPORT_SYMBOL(_mcount); #endif diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c index c73ce3f4197..b3e3737750d 100644 --- a/arch/sparc64/kernel/stacktrace.c +++ b/arch/sparc64/kernel/stacktrace.c @@ -1,6 +1,7 @@ #include <linux/sched.h> #include <linux/stacktrace.h> #include <linux/thread_info.h> +#include <linux/module.h> #include <asm/ptrace.h> #include <asm/stacktrace.h> @@ -47,3 +48,4 @@ void save_stack_trace(struct stack_trace *trace) trace->entries[trace->nr_entries++] = pc; } while (trace->nr_entries < trace->max_entries); } +EXPORT_SYMBOL_GPL(save_stack_trace); diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c index e5d238970c7..bedc4c159b1 100644 --- a/arch/sparc64/kernel/time.c +++ b/arch/sparc64/kernel/time.c @@ -11,6 +11,7 @@ #include <linux/errno.h> #include <linux/module.h> #include <linux/sched.h> +#include <linux/smp_lock.h> #include <linux/kernel.h> #include <linux/param.h> #include <linux/string.h> @@ -1659,10 +1660,14 @@ static int mini_rtc_ioctl(struct inode *inode, struct file *file, static int mini_rtc_open(struct inode *inode, struct file *file) { - if (mini_rtc_status & RTC_IS_OPEN) + lock_kernel(); + if (mini_rtc_status & RTC_IS_OPEN) { + unlock_kernel(); return -EBUSY; + } mini_rtc_status |= RTC_IS_OPEN; + unlock_kernel(); return 0; } |