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linux/kernel/trace
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Steven Rostedt 34ea8fa084 tracing: Have reserve_mem use phys_to_virt() and separate from memmap buffer 
The reserve_mem kernel command line option may pass back a physical
address, but the memory is still part of the normal memory just like
using memblock_alloc() would be. This means that the physical memory
returned by the reserve_mem command line option can be converted directly
to virtual memory by simply using phys_to_virt().

When freeing the buffer there's no need to call vunmap() anymore as the
memory allocated by reserve_mem is freed by the call to
reserve_mem_release_by_name().

Because the persistent ring buffer can also be allocated via the memmap
option, which *is* different than normal memory as it cannot be added back
to the buddy system, it must be treated differently. It still needs to be
virtually mapped to have access to it. It also can not be freed nor can it
ever be memory mapped to user space.

Create a new trace_array flag called TRACE_ARRAY_FL_MEMMAP which gets set
if the buffer is created by the memmap option, and this will prevent the
buffer from being memory mapped by user space.

Also increment the ref count for memmap'ed buffers so that they can never
be freed.

Link: https://lore.kernel.org/all/Z-wFszhJ_9o4dc8O@kernel.org/

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vincent Donnefort <vdonnefort@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Jann Horn <jannh@google.com>
Link: https://lore.kernel.org/20250402144953.583750106@goodmis.org
Suggested-by: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2025-04-02 11:02:26 -04:00
..
rv verification/dot2k: Auto patch current kernel source 2024-12-27 14:39:35 -05:00
blktrace.c blktrace: remove redundant return at end of function 2024-12-23 08:17:23 -07:00
bpf_trace.c bpf-next-6.14 2025-01-23 08:04:07 -08:00
bpf_trace.h tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
error_report-traces.c
fgraph.c fgraph: Remove calltime and rettime from generic operations 2025-01-21 21:55:49 -05:00
fprobe.c fprobe: Fix accounting of when to unregister from function graph 2025-02-21 09:36:12 -05:00
ftrace.c ftrace: Do not add duplicate entries in subops manager ops 2025-02-21 09:36:12 -05:00
ftrace_internal.h function_graph: Make fgraph_update_pid_func() a stub for !DYNAMIC_FTRACE 2024-06-10 18:08:23 -04:00
Kconfig fprobe: Rewrite fprobe on function-graph tracer 2024-12-26 10:50:05 -05:00
kprobe_event_gen_test.c tracing: Fix wrong return in kprobe_event_gen_test.c 2023-03-19 12:20:48 -04:00
Makefile tracing/probes: Move finding func-proto API and getting func-param API to trace_btf 2023-08-23 09:39:45 +09:00
pid_list.c pid: allow pid_max to be set per pid namespace 2024-12-02 11:25:25 +01:00
pid_list.h
power-traces.c
preemptirq_delay_test.c minmax: make generic MIN() and MAX() macros available everywhere 2024-07-28 15:49:18 -07:00
rethook.c rethook: honor CONFIG_FTRACE_VALIDATE_RCU_IS_WATCHING in rethook_try_get() 2024-05-01 23:18:48 +09:00
ring_buffer.c ring-buffer: Remove the unused variable bmeta 2025-03-28 08:39:56 -04:00
ring_buffer_benchmark.c ring-buffer: Use str_low_high() helper in ring_buffer_producer() 2024-10-19 11:12:25 -04:00
rpm-traces.c
synth_event_gen_test.c tracing / synthetic: Disable events after testing in synth_event_gen_test_init() 2023-12-21 10:04:45 -05:00
trace.c tracing: Have reserve_mem use phys_to_virt() and separate from memmap buffer 2025-04-02 11:02:26 -04:00
trace.h tracing: Have reserve_mem use phys_to_virt() and separate from memmap buffer 2025-04-02 11:02:26 -04:00
trace_benchmark.c tracing: Improve benchmark test performance by using do_div() 2024-05-13 20:00:57 -04:00
trace_benchmark.h tracing: Add numeric delta time to the trace event benchmark 2022-09-26 13:01:09 -04:00
trace_boot.c tracing: Allow creating instances with specified system events 2023-12-18 23:14:16 -05:00
trace_branch.c tracing: Remove TRACE_EVENT_FL_FILTERED logic 2024-10-08 15:24:49 -04:00
trace_btf.c tracing/probes: Fix to search structure fields correctly 2024-02-17 21:25:42 +09:00
trace_btf.h tracing/probes: Add a function to search a member of a struct/union 2023-08-23 09:40:16 +09:00
trace_clock.c tracing: Use atomic64_inc_return() in trace_clock_counter() 2024-10-09 19:59:49 -04:00
trace_dynevent.c tracing/string: Create and use __free(argv_free) in trace_dynevent.c 2024-12-26 10:38:37 -05:00
trace_dynevent.h
trace_entries.h fgraph: Remove calltime and rettime from generic operations 2025-01-21 21:55:49 -05:00
trace_eprobe.c tracing/eprobe: Adopt guard() and scoped_guard() 2025-01-10 09:00:12 +09:00
trace_event_perf.c trace/trace_event_perf: remove duplicate samples on the first tracepoint event 2024-10-09 19:44:54 -04:00
trace_events.c tracing: Update modules to persistent instances when loaded 2025-03-28 08:39:27 -04:00
trace_events_filter.c tracing: Switch trace_events_filter.c code over to use guard() 2024-12-26 10:38:37 -05:00
trace_events_filter_test.h
trace_events_hist.c tracing/hist: Support POLLPRI event for poll on histogram 2025-01-07 11:46:32 -05:00
trace_events_inject.c tracing: Have format file honor EVENT_FILE_FL_FREED 2024-08-07 18:12:46 -04:00
trace_events_synth.c tracing: Switch trace_events_synth.c code over to use guard() 2024-12-26 10:38:37 -05:00
trace_events_trigger.c tracing: Switch trace_events_trigger.c code over to use guard() 2024-12-26 10:38:37 -05:00
trace_events_user.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
trace_export.c tracing: Add back FORTIFY_SOURCE logic to kernel_stack event structure 2023-07-30 18:11:44 -04:00
trace_fprobe.c tracing: Adopt __free() and guard() for trace_fprobe.c 2025-01-16 21:27:07 -05:00
trace_functions.c ftrace: Correct preemption accounting for function tracing. 2025-02-21 09:36:12 -05:00
trace_functions_graph.c fgraph: Fix set_graph_notrace with setting TRACE_GRAPH_NOTRACE_BIT 2025-02-08 08:36:45 -05:00
trace_hwlat.c tracing: Remove TRACE_EVENT_FL_FILTERED logic 2024-10-08 15:24:49 -04:00
trace_irqsoff.c fgraph: Remove calltime and rettime from generic operations 2025-01-21 21:55:49 -05:00
trace_kdb.c trace: kdb: Replace simple_strtoul with kstrtoul in kdb_ftdump 2024-11-02 08:33:13 +00:00
trace_kprobe.c tracing/kprobes: Simplify __trace_kprobe_create() by removing gotos 2025-01-10 09:01:14 +09:00
trace_kprobe_selftest.c tracing: arm64: Avoid missing-prototype warnings 2023-07-12 12:06:04 -04:00
trace_kprobe_selftest.h
trace_mmiotrace.c tracing: Remove TRACE_EVENT_FL_FILTERED logic 2024-10-08 15:24:49 -04:00
trace_nop.c
trace_osnoise.c Runtime verifier and osnoise fixes for 6.14: 2025-01-26 14:19:45 -08:00
trace_output.c tracing: Show last module text symbols in the stacktrace 2025-03-28 08:39:56 -04:00
trace_output.h tracing: Add "fields" option to show raw trace event fields 2023-03-29 06:52:08 -04:00
trace_preemptirq.c tracing: Fix archs that still call tracepoints without RCU watching 2024-12-05 09:28:58 -05:00
trace_printk.c
trace_probe.c tracing: Use __free() in trace_probe for cleanup 2025-01-10 09:00:13 +09:00
trace_probe.h tracing/probes: support '%pd' type for print struct dentry's name 2024-05-01 23:18:47 +09:00
trace_probe_kernel.h tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails 2023-07-14 17:04:58 +09:00
trace_probe_tmpl.h tracing/fprobe: Enable fprobe events with CONFIG_DYNAMIC_FTRACE_WITH_ARGS 2024-12-26 10:50:04 -05:00
trace_recursion_record.c
trace_sched_switch.c pid: allow pid_max to be set per pid namespace 2024-12-02 11:25:25 +01:00
trace_sched_wakeup.c fgraph: Remove calltime and rettime from generic operations 2025-01-21 21:55:49 -05:00
trace_selftest.c fgraph: Pass ftrace_regs to retfunc 2024-12-26 10:50:03 -05:00
trace_selftest_dynamic.c
trace_seq.c trace_seq: Increase the buffer size to almost two pages 2023-12-18 23:14:16 -05:00
trace_stack.c tracing: Switch trace_stack.c code over to use guard() 2024-12-26 10:38:37 -05:00
trace_stat.c tracing: Switch trace_stat.c code over to use guard() 2024-12-26 10:38:37 -05:00
trace_stat.h
trace_synth.h tracing: Allow synthetic events to pass around stacktraces 2023-01-25 10:31:24 -05:00
trace_syscalls.c tracing/perf: Add might_fault check to syscall probes 2024-10-09 17:09:46 -04:00
trace_uprobe.c tracing/uprobe: Adopt guard() and scoped_guard() 2025-01-10 09:00:12 +09:00
tracing_map.c tracing: Fix cmp_entries_dup() to respect sort() comparison rules 2024-12-04 10:38:24 -05:00
tracing_map.h tracing: Remove unused extern declaration tracing_map_set_field_descr() 2023-07-23 11:08:14 -04:00