mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-19 07:07:40 +07:00
45dd9b0666
Doing an audit of trace events, I discovered two trace events in the xen
subsystem that use a hack to create zero data size trace events. This is not
what trace events are for. Trace events add memory footprint overhead, and
if all you need to do is see if a function is hit or not, simply make that
function noinline and use function tracer filtering.
Worse yet, the hack used was:
__array(char, x, 0)
Which creates a static string of zero in length. There's assumptions about
such constructs in ftrace that this is a dynamic string that is nul
terminated. This is not the case with these tracepoints and can cause
problems in various parts of ftrace.
Nuke the trace events!
Link: http://lkml.kernel.org/r/20180509144605.5a220327@gandalf.local.home
Cc: stable@vger.kernel.org
Fixes: 95a7d76897 ("xen/mmu: Use Xen specific TLB flush instead of the generic one.")
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
476 lines
14 KiB
C
476 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM xen
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#if !defined(_TRACE_XEN_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_XEN_H
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#include <linux/tracepoint.h>
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#include <asm/paravirt_types.h>
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#include <asm/xen/trace_types.h>
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struct multicall_entry;
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/* Multicalls */
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DECLARE_EVENT_CLASS(xen_mc__batch,
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TP_PROTO(enum paravirt_lazy_mode mode),
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TP_ARGS(mode),
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TP_STRUCT__entry(
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__field(enum paravirt_lazy_mode, mode)
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),
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TP_fast_assign(__entry->mode = mode),
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TP_printk("start batch LAZY_%s",
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(__entry->mode == PARAVIRT_LAZY_MMU) ? "MMU" :
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(__entry->mode == PARAVIRT_LAZY_CPU) ? "CPU" : "NONE")
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);
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#define DEFINE_XEN_MC_BATCH(name) \
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DEFINE_EVENT(xen_mc__batch, name, \
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TP_PROTO(enum paravirt_lazy_mode mode), \
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TP_ARGS(mode))
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DEFINE_XEN_MC_BATCH(xen_mc_batch);
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DEFINE_XEN_MC_BATCH(xen_mc_issue);
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TRACE_DEFINE_SIZEOF(ulong);
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TRACE_EVENT(xen_mc_entry,
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TP_PROTO(struct multicall_entry *mc, unsigned nargs),
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TP_ARGS(mc, nargs),
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TP_STRUCT__entry(
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__field(unsigned int, op)
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__field(unsigned int, nargs)
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__array(unsigned long, args, 6)
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),
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TP_fast_assign(__entry->op = mc->op;
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__entry->nargs = nargs;
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memcpy(__entry->args, mc->args, sizeof(ulong) * nargs);
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memset(__entry->args + nargs, 0, sizeof(ulong) * (6 - nargs));
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),
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TP_printk("op %u%s args [%lx, %lx, %lx, %lx, %lx, %lx]",
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__entry->op, xen_hypercall_name(__entry->op),
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__entry->args[0], __entry->args[1], __entry->args[2],
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__entry->args[3], __entry->args[4], __entry->args[5])
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);
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TRACE_EVENT(xen_mc_entry_alloc,
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TP_PROTO(size_t args),
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TP_ARGS(args),
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TP_STRUCT__entry(
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__field(size_t, args)
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),
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TP_fast_assign(__entry->args = args),
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TP_printk("alloc entry %zu arg bytes", __entry->args)
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);
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TRACE_EVENT(xen_mc_callback,
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TP_PROTO(xen_mc_callback_fn_t fn, void *data),
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TP_ARGS(fn, data),
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TP_STRUCT__entry(
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__field(xen_mc_callback_fn_t, fn)
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__field(void *, data)
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),
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TP_fast_assign(
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__entry->fn = fn;
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__entry->data = data;
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),
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TP_printk("callback %pf, data %p",
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__entry->fn, __entry->data)
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);
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TRACE_EVENT(xen_mc_flush_reason,
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TP_PROTO(enum xen_mc_flush_reason reason),
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TP_ARGS(reason),
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TP_STRUCT__entry(
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__field(enum xen_mc_flush_reason, reason)
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),
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TP_fast_assign(__entry->reason = reason),
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TP_printk("flush reason %s",
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(__entry->reason == XEN_MC_FL_NONE) ? "NONE" :
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(__entry->reason == XEN_MC_FL_BATCH) ? "BATCH" :
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(__entry->reason == XEN_MC_FL_ARGS) ? "ARGS" :
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(__entry->reason == XEN_MC_FL_CALLBACK) ? "CALLBACK" : "??")
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);
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TRACE_EVENT(xen_mc_flush,
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TP_PROTO(unsigned mcidx, unsigned argidx, unsigned cbidx),
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TP_ARGS(mcidx, argidx, cbidx),
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TP_STRUCT__entry(
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__field(unsigned, mcidx)
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__field(unsigned, argidx)
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__field(unsigned, cbidx)
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),
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TP_fast_assign(__entry->mcidx = mcidx;
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__entry->argidx = argidx;
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__entry->cbidx = cbidx),
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TP_printk("flushing %u hypercalls, %u arg bytes, %u callbacks",
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__entry->mcidx, __entry->argidx, __entry->cbidx)
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);
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TRACE_EVENT(xen_mc_extend_args,
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TP_PROTO(unsigned long op, size_t args, enum xen_mc_extend_args res),
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TP_ARGS(op, args, res),
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TP_STRUCT__entry(
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__field(unsigned int, op)
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__field(size_t, args)
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__field(enum xen_mc_extend_args, res)
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),
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TP_fast_assign(__entry->op = op;
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__entry->args = args;
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__entry->res = res),
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TP_printk("extending op %u%s by %zu bytes res %s",
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__entry->op, xen_hypercall_name(__entry->op),
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__entry->args,
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__entry->res == XEN_MC_XE_OK ? "OK" :
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__entry->res == XEN_MC_XE_BAD_OP ? "BAD_OP" :
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__entry->res == XEN_MC_XE_NO_SPACE ? "NO_SPACE" : "???")
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);
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TRACE_DEFINE_SIZEOF(pteval_t);
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/* mmu */
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DECLARE_EVENT_CLASS(xen_mmu__set_pte,
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TP_PROTO(pte_t *ptep, pte_t pteval),
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TP_ARGS(ptep, pteval),
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TP_STRUCT__entry(
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__field(pte_t *, ptep)
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__field(pteval_t, pteval)
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),
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TP_fast_assign(__entry->ptep = ptep;
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__entry->pteval = pteval.pte),
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TP_printk("ptep %p pteval %0*llx (raw %0*llx)",
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__entry->ptep,
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(int)sizeof(pteval_t) * 2, (unsigned long long)pte_val(native_make_pte(__entry->pteval)),
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(int)sizeof(pteval_t) * 2, (unsigned long long)__entry->pteval)
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);
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#define DEFINE_XEN_MMU_SET_PTE(name) \
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DEFINE_EVENT(xen_mmu__set_pte, name, \
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TP_PROTO(pte_t *ptep, pte_t pteval), \
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TP_ARGS(ptep, pteval))
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DEFINE_XEN_MMU_SET_PTE(xen_mmu_set_pte);
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TRACE_EVENT(xen_mmu_set_pte_at,
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TP_PROTO(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pteval),
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TP_ARGS(mm, addr, ptep, pteval),
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TP_STRUCT__entry(
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__field(struct mm_struct *, mm)
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__field(unsigned long, addr)
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__field(pte_t *, ptep)
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__field(pteval_t, pteval)
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),
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TP_fast_assign(__entry->mm = mm;
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__entry->addr = addr;
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__entry->ptep = ptep;
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__entry->pteval = pteval.pte),
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TP_printk("mm %p addr %lx ptep %p pteval %0*llx (raw %0*llx)",
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__entry->mm, __entry->addr, __entry->ptep,
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(int)sizeof(pteval_t) * 2, (unsigned long long)pte_val(native_make_pte(__entry->pteval)),
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(int)sizeof(pteval_t) * 2, (unsigned long long)__entry->pteval)
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);
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TRACE_DEFINE_SIZEOF(pmdval_t);
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TRACE_EVENT(xen_mmu_set_pmd,
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TP_PROTO(pmd_t *pmdp, pmd_t pmdval),
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TP_ARGS(pmdp, pmdval),
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TP_STRUCT__entry(
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__field(pmd_t *, pmdp)
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__field(pmdval_t, pmdval)
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),
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TP_fast_assign(__entry->pmdp = pmdp;
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__entry->pmdval = pmdval.pmd),
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TP_printk("pmdp %p pmdval %0*llx (raw %0*llx)",
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__entry->pmdp,
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(int)sizeof(pmdval_t) * 2, (unsigned long long)pmd_val(native_make_pmd(__entry->pmdval)),
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(int)sizeof(pmdval_t) * 2, (unsigned long long)__entry->pmdval)
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);
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#ifdef CONFIG_X86_PAE
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DEFINE_XEN_MMU_SET_PTE(xen_mmu_set_pte_atomic);
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TRACE_EVENT(xen_mmu_pte_clear,
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TP_PROTO(struct mm_struct *mm, unsigned long addr, pte_t *ptep),
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TP_ARGS(mm, addr, ptep),
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TP_STRUCT__entry(
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__field(struct mm_struct *, mm)
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__field(unsigned long, addr)
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__field(pte_t *, ptep)
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),
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TP_fast_assign(__entry->mm = mm;
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__entry->addr = addr;
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__entry->ptep = ptep),
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TP_printk("mm %p addr %lx ptep %p",
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__entry->mm, __entry->addr, __entry->ptep)
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);
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TRACE_EVENT(xen_mmu_pmd_clear,
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TP_PROTO(pmd_t *pmdp),
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TP_ARGS(pmdp),
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TP_STRUCT__entry(
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__field(pmd_t *, pmdp)
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),
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TP_fast_assign(__entry->pmdp = pmdp),
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TP_printk("pmdp %p", __entry->pmdp)
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);
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#endif
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#if CONFIG_PGTABLE_LEVELS >= 4
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TRACE_DEFINE_SIZEOF(pudval_t);
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TRACE_EVENT(xen_mmu_set_pud,
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TP_PROTO(pud_t *pudp, pud_t pudval),
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TP_ARGS(pudp, pudval),
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TP_STRUCT__entry(
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__field(pud_t *, pudp)
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__field(pudval_t, pudval)
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),
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TP_fast_assign(__entry->pudp = pudp;
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__entry->pudval = native_pud_val(pudval)),
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TP_printk("pudp %p pudval %0*llx (raw %0*llx)",
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__entry->pudp,
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(int)sizeof(pudval_t) * 2, (unsigned long long)pud_val(native_make_pud(__entry->pudval)),
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(int)sizeof(pudval_t) * 2, (unsigned long long)__entry->pudval)
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);
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TRACE_DEFINE_SIZEOF(p4dval_t);
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TRACE_EVENT(xen_mmu_set_p4d,
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TP_PROTO(p4d_t *p4dp, p4d_t *user_p4dp, p4d_t p4dval),
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TP_ARGS(p4dp, user_p4dp, p4dval),
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TP_STRUCT__entry(
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__field(p4d_t *, p4dp)
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__field(p4d_t *, user_p4dp)
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__field(p4dval_t, p4dval)
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),
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TP_fast_assign(__entry->p4dp = p4dp;
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__entry->user_p4dp = user_p4dp;
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__entry->p4dval = p4d_val(p4dval)),
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TP_printk("p4dp %p user_p4dp %p p4dval %0*llx (raw %0*llx)",
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__entry->p4dp, __entry->user_p4dp,
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(int)sizeof(p4dval_t) * 2, (unsigned long long)pgd_val(native_make_pgd(__entry->p4dval)),
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(int)sizeof(p4dval_t) * 2, (unsigned long long)__entry->p4dval)
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);
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#else
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TRACE_EVENT(xen_mmu_set_pud,
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TP_PROTO(pud_t *pudp, pud_t pudval),
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TP_ARGS(pudp, pudval),
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TP_STRUCT__entry(
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__field(pud_t *, pudp)
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__field(pudval_t, pudval)
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),
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TP_fast_assign(__entry->pudp = pudp;
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__entry->pudval = native_pud_val(pudval)),
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TP_printk("pudp %p pudval %0*llx (raw %0*llx)",
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__entry->pudp,
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(int)sizeof(pudval_t) * 2, (unsigned long long)pgd_val(native_make_pgd(__entry->pudval)),
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(int)sizeof(pudval_t) * 2, (unsigned long long)__entry->pudval)
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);
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#endif
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DECLARE_EVENT_CLASS(xen_mmu_ptep_modify_prot,
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TP_PROTO(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pteval),
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TP_ARGS(mm, addr, ptep, pteval),
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TP_STRUCT__entry(
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__field(struct mm_struct *, mm)
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__field(unsigned long, addr)
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__field(pte_t *, ptep)
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__field(pteval_t, pteval)
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),
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TP_fast_assign(__entry->mm = mm;
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__entry->addr = addr;
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__entry->ptep = ptep;
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__entry->pteval = pteval.pte),
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TP_printk("mm %p addr %lx ptep %p pteval %0*llx (raw %0*llx)",
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__entry->mm, __entry->addr, __entry->ptep,
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(int)sizeof(pteval_t) * 2, (unsigned long long)pte_val(native_make_pte(__entry->pteval)),
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(int)sizeof(pteval_t) * 2, (unsigned long long)__entry->pteval)
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);
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#define DEFINE_XEN_MMU_PTEP_MODIFY_PROT(name) \
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DEFINE_EVENT(xen_mmu_ptep_modify_prot, name, \
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TP_PROTO(struct mm_struct *mm, unsigned long addr, \
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pte_t *ptep, pte_t pteval), \
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TP_ARGS(mm, addr, ptep, pteval))
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DEFINE_XEN_MMU_PTEP_MODIFY_PROT(xen_mmu_ptep_modify_prot_start);
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DEFINE_XEN_MMU_PTEP_MODIFY_PROT(xen_mmu_ptep_modify_prot_commit);
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TRACE_EVENT(xen_mmu_alloc_ptpage,
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TP_PROTO(struct mm_struct *mm, unsigned long pfn, unsigned level, bool pinned),
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TP_ARGS(mm, pfn, level, pinned),
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TP_STRUCT__entry(
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__field(struct mm_struct *, mm)
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__field(unsigned long, pfn)
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__field(unsigned, level)
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__field(bool, pinned)
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),
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TP_fast_assign(__entry->mm = mm;
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__entry->pfn = pfn;
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__entry->level = level;
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__entry->pinned = pinned),
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TP_printk("mm %p pfn %lx level %d %spinned",
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__entry->mm, __entry->pfn, __entry->level,
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__entry->pinned ? "" : "un")
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);
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TRACE_EVENT(xen_mmu_release_ptpage,
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TP_PROTO(unsigned long pfn, unsigned level, bool pinned),
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TP_ARGS(pfn, level, pinned),
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TP_STRUCT__entry(
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__field(unsigned long, pfn)
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__field(unsigned, level)
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__field(bool, pinned)
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),
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TP_fast_assign(__entry->pfn = pfn;
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__entry->level = level;
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__entry->pinned = pinned),
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TP_printk("pfn %lx level %d %spinned",
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__entry->pfn, __entry->level,
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__entry->pinned ? "" : "un")
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);
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DECLARE_EVENT_CLASS(xen_mmu_pgd,
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TP_PROTO(struct mm_struct *mm, pgd_t *pgd),
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TP_ARGS(mm, pgd),
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TP_STRUCT__entry(
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__field(struct mm_struct *, mm)
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__field(pgd_t *, pgd)
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),
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TP_fast_assign(__entry->mm = mm;
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__entry->pgd = pgd),
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TP_printk("mm %p pgd %p", __entry->mm, __entry->pgd)
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);
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#define DEFINE_XEN_MMU_PGD_EVENT(name) \
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DEFINE_EVENT(xen_mmu_pgd, name, \
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TP_PROTO(struct mm_struct *mm, pgd_t *pgd), \
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TP_ARGS(mm, pgd))
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DEFINE_XEN_MMU_PGD_EVENT(xen_mmu_pgd_pin);
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DEFINE_XEN_MMU_PGD_EVENT(xen_mmu_pgd_unpin);
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TRACE_EVENT(xen_mmu_flush_tlb_one_user,
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TP_PROTO(unsigned long addr),
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TP_ARGS(addr),
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TP_STRUCT__entry(
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__field(unsigned long, addr)
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),
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TP_fast_assign(__entry->addr = addr),
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TP_printk("addr %lx", __entry->addr)
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);
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TRACE_EVENT(xen_mmu_flush_tlb_others,
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TP_PROTO(const struct cpumask *cpus, struct mm_struct *mm,
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unsigned long addr, unsigned long end),
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TP_ARGS(cpus, mm, addr, end),
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TP_STRUCT__entry(
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__field(unsigned, ncpus)
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__field(struct mm_struct *, mm)
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__field(unsigned long, addr)
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__field(unsigned long, end)
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),
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TP_fast_assign(__entry->ncpus = cpumask_weight(cpus);
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__entry->mm = mm;
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__entry->addr = addr,
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__entry->end = end),
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TP_printk("ncpus %d mm %p addr %lx, end %lx",
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__entry->ncpus, __entry->mm, __entry->addr, __entry->end)
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);
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TRACE_EVENT(xen_mmu_write_cr3,
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TP_PROTO(bool kernel, unsigned long cr3),
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TP_ARGS(kernel, cr3),
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TP_STRUCT__entry(
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__field(bool, kernel)
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__field(unsigned long, cr3)
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),
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TP_fast_assign(__entry->kernel = kernel;
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__entry->cr3 = cr3),
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TP_printk("%s cr3 %lx",
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__entry->kernel ? "kernel" : "user", __entry->cr3)
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);
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/* CPU */
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TRACE_EVENT(xen_cpu_write_ldt_entry,
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TP_PROTO(struct desc_struct *dt, int entrynum, u64 desc),
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TP_ARGS(dt, entrynum, desc),
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TP_STRUCT__entry(
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__field(struct desc_struct *, dt)
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__field(int, entrynum)
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__field(u64, desc)
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),
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TP_fast_assign(__entry->dt = dt;
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__entry->entrynum = entrynum;
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__entry->desc = desc;
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),
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TP_printk("dt %p entrynum %d entry %016llx",
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__entry->dt, __entry->entrynum,
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(unsigned long long)__entry->desc)
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);
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TRACE_EVENT(xen_cpu_write_idt_entry,
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|
TP_PROTO(gate_desc *dt, int entrynum, const gate_desc *ent),
|
|
TP_ARGS(dt, entrynum, ent),
|
|
TP_STRUCT__entry(
|
|
__field(gate_desc *, dt)
|
|
__field(int, entrynum)
|
|
),
|
|
TP_fast_assign(__entry->dt = dt;
|
|
__entry->entrynum = entrynum;
|
|
),
|
|
TP_printk("dt %p entrynum %d",
|
|
__entry->dt, __entry->entrynum)
|
|
);
|
|
|
|
TRACE_EVENT(xen_cpu_load_idt,
|
|
TP_PROTO(const struct desc_ptr *desc),
|
|
TP_ARGS(desc),
|
|
TP_STRUCT__entry(
|
|
__field(unsigned long, addr)
|
|
),
|
|
TP_fast_assign(__entry->addr = desc->address),
|
|
TP_printk("addr %lx", __entry->addr)
|
|
);
|
|
|
|
TRACE_EVENT(xen_cpu_write_gdt_entry,
|
|
TP_PROTO(struct desc_struct *dt, int entrynum, const void *desc, int type),
|
|
TP_ARGS(dt, entrynum, desc, type),
|
|
TP_STRUCT__entry(
|
|
__field(u64, desc)
|
|
__field(struct desc_struct *, dt)
|
|
__field(int, entrynum)
|
|
__field(int, type)
|
|
),
|
|
TP_fast_assign(__entry->dt = dt;
|
|
__entry->entrynum = entrynum;
|
|
__entry->desc = *(u64 *)desc;
|
|
__entry->type = type;
|
|
),
|
|
TP_printk("dt %p entrynum %d type %d desc %016llx",
|
|
__entry->dt, __entry->entrynum, __entry->type,
|
|
(unsigned long long)__entry->desc)
|
|
);
|
|
|
|
TRACE_EVENT(xen_cpu_set_ldt,
|
|
TP_PROTO(const void *addr, unsigned entries),
|
|
TP_ARGS(addr, entries),
|
|
TP_STRUCT__entry(
|
|
__field(const void *, addr)
|
|
__field(unsigned, entries)
|
|
),
|
|
TP_fast_assign(__entry->addr = addr;
|
|
__entry->entries = entries),
|
|
TP_printk("addr %p entries %u",
|
|
__entry->addr, __entry->entries)
|
|
);
|
|
|
|
|
|
#endif /* _TRACE_XEN_H */
|
|
|
|
/* This part must be outside protection */
|
|
#include <trace/define_trace.h>
|