From 91a27b2a756784714e924e5e854b919273082d26 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Wed, 10 Oct 2012 15:25:28 -0400 Subject: vfs: define struct filename and have getname() return it getname() is intended to copy pathname strings from userspace into a kernel buffer. The result is just a string in kernel space. It would however be quite helpful to be able to attach some ancillary info to the string. For instance, we could attach some audit-related info to reduce the amount of audit-related processing needed. When auditing is enabled, we could also call getname() on the string more than once and not need to recopy it from userspace. This patchset converts the getname()/putname() interfaces to return a struct instead of a string. For now, the struct just tracks the string in kernel space and the original userland pointer for it. Later, we'll add other information to the struct as it becomes convenient. Signed-off-by: Jeff Layton Signed-off-by: Al Viro --- arch/sparc/kernel/process_64.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch/sparc/kernel/process_64.c') diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c index aff0c72fac09..fcaa59421126 100644 --- a/arch/sparc/kernel/process_64.c +++ b/arch/sparc/kernel/process_64.c @@ -722,7 +722,7 @@ EXPORT_SYMBOL(dump_fpu); asmlinkage int sparc_execve(struct pt_regs *regs) { int error, base = 0; - char *filename; + struct filename *filename; /* User register window flush is done by entry.S */ @@ -734,7 +734,7 @@ asmlinkage int sparc_execve(struct pt_regs *regs) error = PTR_ERR(filename); if (IS_ERR(filename)) goto out; - error = do_execve(filename, + error = do_execve(filename->name, (const char __user *const __user *) regs->u_regs[base + UREG_I1], (const char __user *const __user *) -- cgit v1.2.3 From 916ca14aaf12a7191118adb51bb95e3c7866380d Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 16 Oct 2012 09:34:01 -0700 Subject: sparc64: Add global PMU register dumping via sysrq. Signed-off-by: David S. Miller --- Documentation/sysrq.txt | 1 + arch/sparc/include/asm/ptrace.h | 13 ++++- arch/sparc/include/asm/smp_64.h | 2 + arch/sparc/kernel/process_64.c | 120 +++++++++++++++++++++++++++++++++------- arch/sparc/kernel/smp_64.c | 11 ++++ arch/sparc/mm/ultra.S | 64 ++++++++++++++++++++- drivers/tty/sysrq.c | 1 + 7 files changed, 189 insertions(+), 23 deletions(-) (limited to 'arch/sparc/kernel/process_64.c') diff --git a/Documentation/sysrq.txt b/Documentation/sysrq.txt index 642f84495b29..2a4cdda4828e 100644 --- a/Documentation/sysrq.txt +++ b/Documentation/sysrq.txt @@ -116,6 +116,7 @@ On all - write a character to /proc/sysrq-trigger. e.g.: 'w' - Dumps tasks that are in uninterruptable (blocked) state. 'x' - Used by xmon interface on ppc/powerpc platforms. + Show global PMU Registers on sparc64. 'y' - Show global CPU Registers [SPARC-64 specific] diff --git a/arch/sparc/include/asm/ptrace.h b/arch/sparc/include/asm/ptrace.h index 0c6f6b068289..da43bdc62294 100644 --- a/arch/sparc/include/asm/ptrace.h +++ b/arch/sparc/include/asm/ptrace.h @@ -42,7 +42,18 @@ struct global_reg_snapshot { struct thread_info *thread; unsigned long pad1; }; -extern struct global_reg_snapshot global_reg_snapshot[NR_CPUS]; + +struct global_pmu_snapshot { + unsigned long pcr[4]; + unsigned long pic[4]; +}; + +union global_cpu_snapshot { + struct global_reg_snapshot reg; + struct global_pmu_snapshot pmu; +}; + +extern union global_cpu_snapshot global_cpu_snapshot[NR_CPUS]; #define force_successful_syscall_return() \ do { current_thread_info()->syscall_noerror = 1; \ diff --git a/arch/sparc/include/asm/smp_64.h b/arch/sparc/include/asm/smp_64.h index 29862a9e9065..dd3bef4b9896 100644 --- a/arch/sparc/include/asm/smp_64.h +++ b/arch/sparc/include/asm/smp_64.h @@ -48,6 +48,7 @@ extern void smp_fill_in_sib_core_maps(void); extern void cpu_play_dead(void); extern void smp_fetch_global_regs(void); +extern void smp_fetch_global_pmu(void); struct seq_file; void smp_bogo(struct seq_file *); @@ -65,6 +66,7 @@ extern void __cpu_die(unsigned int cpu); #define hard_smp_processor_id() 0 #define smp_fill_in_sib_core_maps() do { } while (0) #define smp_fetch_global_regs() do { } while (0) +#define smp_fetch_global_pmu() do { } while (0) #endif /* !(CONFIG_SMP) */ diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c index fcaa59421126..d778248ef3f8 100644 --- a/arch/sparc/kernel/process_64.c +++ b/arch/sparc/kernel/process_64.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -47,6 +48,7 @@ #include #include #include +#include #include "kstack.h" @@ -204,18 +206,22 @@ void show_regs(struct pt_regs *regs) show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]); } -struct global_reg_snapshot global_reg_snapshot[NR_CPUS]; -static DEFINE_SPINLOCK(global_reg_snapshot_lock); +union global_cpu_snapshot global_cpu_snapshot[NR_CPUS]; +static DEFINE_SPINLOCK(global_cpu_snapshot_lock); static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, int this_cpu) { + struct global_reg_snapshot *rp; + flushw_all(); - global_reg_snapshot[this_cpu].tstate = regs->tstate; - global_reg_snapshot[this_cpu].tpc = regs->tpc; - global_reg_snapshot[this_cpu].tnpc = regs->tnpc; - global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7]; + rp = &global_cpu_snapshot[this_cpu].reg; + + rp->tstate = regs->tstate; + rp->tpc = regs->tpc; + rp->tnpc = regs->tnpc; + rp->o7 = regs->u_regs[UREG_I7]; if (regs->tstate & TSTATE_PRIV) { struct reg_window *rw; @@ -223,17 +229,17 @@ static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, rw = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS); if (kstack_valid(tp, (unsigned long) rw)) { - global_reg_snapshot[this_cpu].i7 = rw->ins[7]; + rp->i7 = rw->ins[7]; rw = (struct reg_window *) (rw->ins[6] + STACK_BIAS); if (kstack_valid(tp, (unsigned long) rw)) - global_reg_snapshot[this_cpu].rpc = rw->ins[7]; + rp->rpc = rw->ins[7]; } } else { - global_reg_snapshot[this_cpu].i7 = 0; - global_reg_snapshot[this_cpu].rpc = 0; + rp->i7 = 0; + rp->rpc = 0; } - global_reg_snapshot[this_cpu].thread = tp; + rp->thread = tp; } /* In order to avoid hangs we do not try to synchronize with the @@ -261,9 +267,9 @@ void arch_trigger_all_cpu_backtrace(void) if (!regs) regs = tp->kregs; - spin_lock_irqsave(&global_reg_snapshot_lock, flags); + spin_lock_irqsave(&global_cpu_snapshot_lock, flags); - memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); + memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); this_cpu = raw_smp_processor_id(); @@ -272,7 +278,7 @@ void arch_trigger_all_cpu_backtrace(void) smp_fetch_global_regs(); for_each_online_cpu(cpu) { - struct global_reg_snapshot *gp = &global_reg_snapshot[cpu]; + struct global_reg_snapshot *gp = &global_cpu_snapshot[cpu].reg; __global_reg_poll(gp); @@ -295,9 +301,9 @@ void arch_trigger_all_cpu_backtrace(void) } } - memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); + memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); - spin_unlock_irqrestore(&global_reg_snapshot_lock, flags); + spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); } #ifdef CONFIG_MAGIC_SYSRQ @@ -309,16 +315,90 @@ static void sysrq_handle_globreg(int key) static struct sysrq_key_op sparc_globalreg_op = { .handler = sysrq_handle_globreg, - .help_msg = "Globalregs", + .help_msg = "global-regs(Y)", .action_msg = "Show Global CPU Regs", }; -static int __init sparc_globreg_init(void) +static void __global_pmu_self(int this_cpu) +{ + struct global_pmu_snapshot *pp; + int i, num; + + pp = &global_cpu_snapshot[this_cpu].pmu; + + num = 1; + if (tlb_type == hypervisor && + sun4v_chip_type >= SUN4V_CHIP_NIAGARA4) + num = 4; + + for (i = 0; i < num; i++) { + pp->pcr[i] = pcr_ops->read_pcr(i); + pp->pic[i] = pcr_ops->read_pic(i); + } +} + +static void __global_pmu_poll(struct global_pmu_snapshot *pp) +{ + int limit = 0; + + while (!pp->pcr[0] && ++limit < 100) { + barrier(); + udelay(1); + } +} + +static void pmu_snapshot_all_cpus(void) { - return register_sysrq_key('y', &sparc_globalreg_op); + unsigned long flags; + int this_cpu, cpu; + + spin_lock_irqsave(&global_cpu_snapshot_lock, flags); + + memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); + + this_cpu = raw_smp_processor_id(); + + __global_pmu_self(this_cpu); + + smp_fetch_global_pmu(); + + for_each_online_cpu(cpu) { + struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu; + + __global_pmu_poll(pp); + + printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n", + (cpu == this_cpu ? '*' : ' '), cpu, + pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3], + pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]); + } + + memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); + + spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); +} + +static void sysrq_handle_globpmu(int key) +{ + pmu_snapshot_all_cpus(); +} + +static struct sysrq_key_op sparc_globalpmu_op = { + .handler = sysrq_handle_globpmu, + .help_msg = "global-pmu(X)", + .action_msg = "Show Global PMU Regs", +}; + +static int __init sparc_sysrq_init(void) +{ + int ret = register_sysrq_key('y', &sparc_globalreg_op); + + if (!ret) + ret = register_sysrq_key('x', &sparc_globalpmu_op); + return ret; } -core_initcall(sparc_globreg_init); +core_initcall(sparc_sysrq_init); #endif diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c index 781bcb10b8bd..d94b878577b7 100644 --- a/arch/sparc/kernel/smp_64.c +++ b/arch/sparc/kernel/smp_64.c @@ -852,6 +852,8 @@ extern unsigned long xcall_flush_tlb_mm; extern unsigned long xcall_flush_tlb_pending; extern unsigned long xcall_flush_tlb_kernel_range; extern unsigned long xcall_fetch_glob_regs; +extern unsigned long xcall_fetch_glob_pmu; +extern unsigned long xcall_fetch_glob_pmu_n4; extern unsigned long xcall_receive_signal; extern unsigned long xcall_new_mmu_context_version; #ifdef CONFIG_KGDB @@ -1000,6 +1002,15 @@ void smp_fetch_global_regs(void) smp_cross_call(&xcall_fetch_glob_regs, 0, 0, 0); } +void smp_fetch_global_pmu(void) +{ + if (tlb_type == hypervisor && + sun4v_chip_type >= SUN4V_CHIP_NIAGARA4) + smp_cross_call(&xcall_fetch_glob_pmu_n4, 0, 0, 0); + else + smp_cross_call(&xcall_fetch_glob_pmu, 0, 0, 0); +} + /* We know that the window frames of the user have been flushed * to the stack before we get here because all callers of us * are flush_tlb_*() routines, and these run after flush_cache_*() diff --git a/arch/sparc/mm/ultra.S b/arch/sparc/mm/ultra.S index 874162a11ceb..f8e13d421fcb 100644 --- a/arch/sparc/mm/ultra.S +++ b/arch/sparc/mm/ultra.S @@ -481,8 +481,8 @@ xcall_sync_tick: .globl xcall_fetch_glob_regs xcall_fetch_glob_regs: - sethi %hi(global_reg_snapshot), %g1 - or %g1, %lo(global_reg_snapshot), %g1 + sethi %hi(global_cpu_snapshot), %g1 + or %g1, %lo(global_cpu_snapshot), %g1 __GET_CPUID(%g2) sllx %g2, 6, %g3 add %g1, %g3, %g1 @@ -509,6 +509,66 @@ xcall_fetch_glob_regs: stx %g3, [%g1 + GR_SNAP_THREAD] retry + .globl xcall_fetch_glob_pmu +xcall_fetch_glob_pmu: + sethi %hi(global_cpu_snapshot), %g1 + or %g1, %lo(global_cpu_snapshot), %g1 + __GET_CPUID(%g2) + sllx %g2, 6, %g3 + add %g1, %g3, %g1 + rd %pic, %g7 + stx %g7, [%g1 + (4 * 8)] + rd %pcr, %g7 + stx %g7, [%g1 + (0 * 8)] + retry + + .globl xcall_fetch_glob_pmu_n4 +xcall_fetch_glob_pmu_n4: + sethi %hi(global_cpu_snapshot), %g1 + or %g1, %lo(global_cpu_snapshot), %g1 + __GET_CPUID(%g2) + sllx %g2, 6, %g3 + add %g1, %g3, %g1 + + ldxa [%g0] ASI_PIC, %g7 + stx %g7, [%g1 + (4 * 8)] + mov 0x08, %g3 + ldxa [%g3] ASI_PIC, %g7 + stx %g7, [%g1 + (5 * 8)] + mov 0x10, %g3 + ldxa [%g3] ASI_PIC, %g7 + stx %g7, [%g1 + (6 * 8)] + mov 0x18, %g3 + ldxa [%g3] ASI_PIC, %g7 + stx %g7, [%g1 + (7 * 8)] + + mov %o0, %g2 + mov %o1, %g3 + mov %o5, %g7 + + mov HV_FAST_VT_GET_PERFREG, %o5 + mov 3, %o0 + ta HV_FAST_TRAP + stx %o1, [%g1 + (3 * 8)] + mov HV_FAST_VT_GET_PERFREG, %o5 + mov 2, %o0 + ta HV_FAST_TRAP + stx %o1, [%g1 + (2 * 8)] + mov HV_FAST_VT_GET_PERFREG, %o5 + mov 1, %o0 + ta HV_FAST_TRAP + stx %o1, [%g1 + (1 * 8)] + mov HV_FAST_VT_GET_PERFREG, %o5 + mov 0, %o0 + ta HV_FAST_TRAP + stx %o1, [%g1 + (0 * 8)] + + mov %g2, %o0 + mov %g3, %o1 + mov %g7, %o5 + + retry + #ifdef DCACHE_ALIASING_POSSIBLE .align 32 .globl xcall_flush_dcache_page_cheetah diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c index 05728894a88c..16ee6cee07da 100644 --- a/drivers/tty/sysrq.c +++ b/drivers/tty/sysrq.c @@ -452,6 +452,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = { NULL, /* v */ &sysrq_showstate_blocked_op, /* w */ /* x: May be registered on ppc/powerpc for xmon */ + /* x: May be registered on sparc64 for global PMU dump */ NULL, /* x */ /* y: May be registered on sparc64 for global register dump */ NULL, /* y */ -- cgit v1.2.3