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linux/arch/powerpc/include/asm/trace.h
Nathan Lynch 2c81ca7fba powerpc/tracing: tracepoints for RTAS entry and exit 
Add two sets of tracepoints to be used around RTAS entry:

* rtas_input/rtas_output, which emit the function name, its inputs,
  the returned status, and any other outputs. These produce an API-level
  record of OS<->RTAS activity.

* rtas_ll_entry/rtas_ll_exit, which are lower-level and emit the
  entire contents of the parameter block (aka rtas_args) on entry and
  exit. Likely useful only for debugging.

With uses of these tracepoints in do_enter_rtas() to be added in the
following patch, examples of get-time-of-day and event-scan functions
as rendered by trace-cmd (with some multi-line formatting manually
imposed on the rtas_ll_* entries to avoid extremely long lines in the
commit message):

cat-36800 [059]  4978.518303: rtas_input:           get-time-of-day arguments:
cat-36800 [059]  4978.518306: rtas_ll_entry:        token=3 nargs=0 nret=8
                                                    params: [0]=0x00000000 [1]=0x00000000 [2]=0x00000000 [3]=0x00000000
                                                            [4]=0x00000000 [5]=0x00000000 [6]=0x00000000 [7]=0x00000000
							    [8]=0x00000000 [9]=0x00000000 [10]=0x00000000 [11]=0x00000000
							    [12]=0x00000000 [13]=0x00000000 [14]=0x00000000 [15]=0x00000000
cat-36800 [059]  4978.518366: rtas_ll_exit:         token=3 nargs=0 nret=8
                                                    params: [0]=0x00000000 [1]=0x000007e6 [2]=0x0000000b [3]=0x00000001
						            [4]=0x00000000 [5]=0x0000000e [6]=0x00000008 [7]=0x2e0dac40
							    [8]=0x00000000 [9]=0x00000000 [10]=0x00000000 [11]=0x00000000
							    [12]=0x00000000 [13]=0x00000000 [14]=0x00000000 [15]=0x00000000
cat-36800 [059]  4978.518366: rtas_output:          get-time-of-day status: 0, other outputs: 2022 11 1 0 14 8 772648000

kworker/39:1-336   [039]  4982.731623: rtas_input:           event-scan arguments: 4294967295 0 80484920 2048
kworker/39:1-336   [039]  4982.731626: rtas_ll_entry:        token=6 nargs=4 nret=1
                                                             params: [0]=0xffffffff [1]=0x00000000 [2]=0x04cc1a38 [3]=0x00000800
							             [4]=0x00000000 [5]=0x0000000e [6]=0x00000008 [7]=0x2e0dac40
								     [8]=0x00000000 [9]=0x00000000 [10]=0x00000000 [11]=0x00000000
								     [12]=0x00000000 [13]=0x00000000 [14]=0x00000000 [15]=0x00000000
kworker/39:1-336   [039]  4982.731676: rtas_ll_exit:         token=6 nargs=4 nret=1
                                                             params: [0]=0xffffffff [1]=0x00000000 [2]=0x04cc1a38 [3]=0x00000800
							             [4]=0x00000001 [5]=0x0000000e [6]=0x00000008 [7]=0x2e0dac40
								     [8]=0x00000000 [9]=0x00000000 [10]=0x00000000 [11]=0x00000000
								     [12]=0x00000000 [13]=0x00000000 [14]=0x00000000 [15]=0x00000000
kworker/39:1-336   [039]  4982.731677: rtas_output:          event-scan status: 1, other outputs:

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230125-b4-powerpc-rtas-queue-v3-10-26929c8cce78@linux.ibm.com
2023-02-13 22:35:02 +11:00

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/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM powerpc
#if !defined(_TRACE_POWERPC_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_POWERPC_H
#include <linux/tracepoint.h>
struct pt_regs;
DECLARE_EVENT_CLASS(ppc64_interrupt_class,
TP_PROTO(struct pt_regs *regs),
TP_ARGS(regs),
TP_STRUCT__entry(
__field(struct pt_regs *, regs)
),
TP_fast_assign(
__entry->regs = regs;
),
TP_printk("pt_regs=%p", __entry->regs)
);
DEFINE_EVENT(ppc64_interrupt_class, irq_entry,
TP_PROTO(struct pt_regs *regs),
TP_ARGS(regs)
);
DEFINE_EVENT(ppc64_interrupt_class, irq_exit,
TP_PROTO(struct pt_regs *regs),
TP_ARGS(regs)
);
DEFINE_EVENT(ppc64_interrupt_class, timer_interrupt_entry,
TP_PROTO(struct pt_regs *regs),
TP_ARGS(regs)
);
DEFINE_EVENT(ppc64_interrupt_class, timer_interrupt_exit,
TP_PROTO(struct pt_regs *regs),
TP_ARGS(regs)
);
#ifdef CONFIG_PPC_DOORBELL
DEFINE_EVENT(ppc64_interrupt_class, doorbell_entry,
TP_PROTO(struct pt_regs *regs),
TP_ARGS(regs)
);
DEFINE_EVENT(ppc64_interrupt_class, doorbell_exit,
TP_PROTO(struct pt_regs *regs),
TP_ARGS(regs)
);
#endif
#ifdef CONFIG_PPC_PSERIES
extern int hcall_tracepoint_regfunc(void);
extern void hcall_tracepoint_unregfunc(void);
TRACE_EVENT_FN_COND(hcall_entry,
TP_PROTO(unsigned long opcode, unsigned long *args),
TP_ARGS(opcode, args),
TP_CONDITION(cpu_online(raw_smp_processor_id())),
TP_STRUCT__entry(
__field(unsigned long, opcode)
),
TP_fast_assign(
__entry->opcode = opcode;
),
TP_printk("opcode=%lu", __entry->opcode),
hcall_tracepoint_regfunc, hcall_tracepoint_unregfunc
);
TRACE_EVENT_FN_COND(hcall_exit,
TP_PROTO(unsigned long opcode, long retval, unsigned long *retbuf),
TP_ARGS(opcode, retval, retbuf),
TP_CONDITION(cpu_online(raw_smp_processor_id())),
TP_STRUCT__entry(
__field(unsigned long, opcode)
__field(long, retval)
),
TP_fast_assign(
__entry->opcode = opcode;
__entry->retval = retval;
),
TP_printk("opcode=%lu retval=%ld", __entry->opcode, __entry->retval),
hcall_tracepoint_regfunc, hcall_tracepoint_unregfunc
);
#endif
#ifdef CONFIG_PPC_RTAS
#include <asm/rtas-types.h>
TRACE_EVENT(rtas_input,
TP_PROTO(struct rtas_args *rtas_args, const char *name),
TP_ARGS(rtas_args, name),
TP_STRUCT__entry(
__field(__u32, nargs)
__string(name, name)
__dynamic_array(__u32, inputs, be32_to_cpu(rtas_args->nargs))
),
TP_fast_assign(
__entry->nargs = be32_to_cpu(rtas_args->nargs);
__assign_str(name, name);
be32_to_cpu_array(__get_dynamic_array(inputs), rtas_args->args, __entry->nargs);
),
TP_printk("%s arguments: %s", __get_str(name),
__print_array(__get_dynamic_array(inputs), __entry->nargs, 4)
)
);
TRACE_EVENT(rtas_output,
TP_PROTO(struct rtas_args *rtas_args, const char *name),
TP_ARGS(rtas_args, name),
TP_STRUCT__entry(
__field(__u32, nr_other)
__field(__s32, status)
__string(name, name)
__dynamic_array(__u32, other_outputs, be32_to_cpu(rtas_args->nret) - 1)
),
TP_fast_assign(
__entry->nr_other = be32_to_cpu(rtas_args->nret) - 1;
__entry->status = be32_to_cpu(rtas_args->rets[0]);
__assign_str(name, name);
be32_to_cpu_array(__get_dynamic_array(other_outputs),
&rtas_args->rets[1], __entry->nr_other);
),
TP_printk("%s status: %d, other outputs: %s", __get_str(name), __entry->status,
__print_array(__get_dynamic_array(other_outputs),
__entry->nr_other, 4)
)
);
DECLARE_EVENT_CLASS(rtas_parameter_block,
TP_PROTO(struct rtas_args *rtas_args),
TP_ARGS(rtas_args),
TP_STRUCT__entry(
__field(u32, token)
__field(u32, nargs)
__field(u32, nret)
__array(__u32, params, 16)
),
TP_fast_assign(
__entry->token = be32_to_cpu(rtas_args->token);
__entry->nargs = be32_to_cpu(rtas_args->nargs);
__entry->nret = be32_to_cpu(rtas_args->nret);
be32_to_cpu_array(__entry->params, rtas_args->args, ARRAY_SIZE(rtas_args->args));
),
TP_printk("token=%u nargs=%u nret=%u params:"
" [0]=0x%08x [1]=0x%08x [2]=0x%08x [3]=0x%08x"
" [4]=0x%08x [5]=0x%08x [6]=0x%08x [7]=0x%08x"
" [8]=0x%08x [9]=0x%08x [10]=0x%08x [11]=0x%08x"
" [12]=0x%08x [13]=0x%08x [14]=0x%08x [15]=0x%08x",
__entry->token, __entry->nargs, __entry->nret,
__entry->params[0], __entry->params[1], __entry->params[2], __entry->params[3],
__entry->params[4], __entry->params[5], __entry->params[6], __entry->params[7],
__entry->params[8], __entry->params[9], __entry->params[10], __entry->params[11],
__entry->params[12], __entry->params[13], __entry->params[14], __entry->params[15]
)
);
DEFINE_EVENT(rtas_parameter_block, rtas_ll_entry,
TP_PROTO(struct rtas_args *rtas_args),
TP_ARGS(rtas_args)
);
DEFINE_EVENT(rtas_parameter_block, rtas_ll_exit,
TP_PROTO(struct rtas_args *rtas_args),
TP_ARGS(rtas_args)
);
#endif /* CONFIG_PPC_RTAS */
#ifdef CONFIG_PPC_POWERNV
extern int opal_tracepoint_regfunc(void);
extern void opal_tracepoint_unregfunc(void);
TRACE_EVENT_FN(opal_entry,
TP_PROTO(unsigned long opcode, unsigned long *args),
TP_ARGS(opcode, args),
TP_STRUCT__entry(
__field(unsigned long, opcode)
),
TP_fast_assign(
__entry->opcode = opcode;
),
TP_printk("opcode=%lu", __entry->opcode),
opal_tracepoint_regfunc, opal_tracepoint_unregfunc
);
TRACE_EVENT_FN(opal_exit,
TP_PROTO(unsigned long opcode, unsigned long retval),
TP_ARGS(opcode, retval),
TP_STRUCT__entry(
__field(unsigned long, opcode)
__field(unsigned long, retval)
),
TP_fast_assign(
__entry->opcode = opcode;
__entry->retval = retval;
),
TP_printk("opcode=%lu retval=%lu", __entry->opcode, __entry->retval),
opal_tracepoint_regfunc, opal_tracepoint_unregfunc
);
#endif
TRACE_EVENT(hash_fault,
TP_PROTO(unsigned long addr, unsigned long access, unsigned long trap),
TP_ARGS(addr, access, trap),
TP_STRUCT__entry(
__field(unsigned long, addr)
__field(unsigned long, access)
__field(unsigned long, trap)
),
TP_fast_assign(
__entry->addr = addr;
__entry->access = access;
__entry->trap = trap;
),
TP_printk("hash fault with addr 0x%lx and access = 0x%lx trap = 0x%lx",
__entry->addr, __entry->access, __entry->trap)
);
TRACE_EVENT(tlbie,
TP_PROTO(unsigned long lpid, unsigned long local, unsigned long rb,
unsigned long rs, unsigned long ric, unsigned long prs,
unsigned long r),
TP_ARGS(lpid, local, rb, rs, ric, prs, r),
TP_STRUCT__entry(
__field(unsigned long, lpid)
__field(unsigned long, local)
__field(unsigned long, rb)
__field(unsigned long, rs)
__field(unsigned long, ric)
__field(unsigned long, prs)
__field(unsigned long, r)
),
TP_fast_assign(
__entry->lpid = lpid;
__entry->local = local;
__entry->rb = rb;
__entry->rs = rs;
__entry->ric = ric;
__entry->prs = prs;
__entry->r = r;
),
TP_printk("lpid=%ld, local=%ld, rb=0x%lx, rs=0x%lx, ric=0x%lx, "
"prs=0x%lx, r=0x%lx", __entry->lpid, __entry->local,
__entry->rb, __entry->rs, __entry->ric, __entry->prs,
__entry->r)
);
TRACE_EVENT(tlbia,
TP_PROTO(unsigned long id),
TP_ARGS(id),
TP_STRUCT__entry(
__field(unsigned long, id)
),
TP_fast_assign(
__entry->id = id;
),
TP_printk("ctx.id=0x%lx", __entry->id)
);
#endif /* _TRACE_POWERPC_H */
#undef TRACE_INCLUDE_PATH
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_PATH asm
#define TRACE_INCLUDE_FILE trace
#include <trace/define_trace.h>
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