linux/kernel/trace/rv, branch v6.0

rv/reactor: add init/exit annotations to module init/exit funcs

2022-09-07T02:26:00Z

Add missing __init/__exit annotations to module init/exit funcs. Link: https://lkml.kernel.org/r/20220906141210.132607-1-xiujianfeng@huawei.com Fixes: 135b881ea885 ("rv/reactor: Add the printk reactor") Fixes: e88043c0ac16 ("rv/reactor: Add the panic reactor") Signed-off-by: Xiu Jianfeng Acked-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rv/monitors: Make monitor's automata definition static

2022-09-07T02:13:25Z

Monitor's automata definition is only used locally, so make them static for all existing monitors. Link: https://lore.kernel.org/all/202208210332.gtHXje45-lkp@intel.com Link: https://lore.kernel.org/all/202208210358.6HH3OrVs-lkp@intel.com Link: https://lkml.kernel.org/r/a50e27c3738d6ef809f4201857229fed64799234.1661266564.git.bristot@kernel.org Fixes: ccc319dcb450 ("rv/monitor: Add the wwnr monitor") Fixes: 8812d21219b9 ("rv/monitor: Add the wip monitor skeleton created by dot2k") Reported-by: kernel test robot Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rv: Unlock on error path in rv_unregister_reactor()

2022-08-05T02:49:17Z

Unlock the "rv_interface_lock" mutex before returning. Link: https://lkml.kernel.org/r/YuvYzNfGMgV+PIhd@kili Fixes: 04acadcb4453 ("rv: Add runtime reactors interface") Signed-off-by: Dan Carpenter Signed-off-by: Steven Rostedt (Google)

rv/reactor: Add the panic reactor

2022-07-30T18:01:30Z

Sample reactor that panics the system when an exception is found. This is useful both to capture a vmcore, or to fail-safe a critical system. Link: https://lkml.kernel.org/r/729aae3aba95f35738b8f8180e626d747d1d9da2.1659052063.git.bristot@kernel.org Cc: Wim Van Sebroeck Cc: Guenter Roeck Cc: Jonathan Corbet Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Will Deacon Cc: Catalin Marinas Cc: Marco Elver Cc: Dmitry Vyukov Cc: "Paul E. McKenney" Cc: Shuah Khan Cc: Gabriele Paoloni Cc: Juri Lelli Cc: Clark Williams Cc: Tao Zhou Cc: Randy Dunlap Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rv/reactor: Add the printk reactor

2022-07-30T18:01:30Z

A reactor that printks the reaction message. Link: https://lkml.kernel.org/r/b65f18a7fd6dc6659a3008fd7b7392de3465d47b.1659052063.git.bristot@kernel.org Cc: Wim Van Sebroeck Cc: Guenter Roeck Cc: Jonathan Corbet Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Will Deacon Cc: Catalin Marinas Cc: Marco Elver Cc: Dmitry Vyukov Cc: "Paul E. McKenney" Cc: Shuah Khan Cc: Gabriele Paoloni Cc: Juri Lelli Cc: Clark Williams Cc: Tao Zhou Cc: Randy Dunlap Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rv/monitor: Add the wwnr monitor

2022-07-30T18:01:30Z

Per task wakeup while not running (wwnr) monitor. This model is broken, the reason is that a task can be running in the processor without being set as RUNNABLE. Think about a task about to sleep: 1: set_current_state(TASK_UNINTERRUPTIBLE); 2: schedule(); And then imagine an IRQ happening in between the lines one and two, waking the task up. BOOM, the wakeup will happen while the task is running. Q: Why do we need this model, so? A: To test the reactors. Link: https://lkml.kernel.org/r/473c0fc39967250fdebcff8b620311c11dccad30.1659052063.git.bristot@kernel.org Cc: Wim Van Sebroeck Cc: Guenter Roeck Cc: Jonathan Corbet Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Will Deacon Cc: Catalin Marinas Cc: Marco Elver Cc: Dmitry Vyukov Cc: "Paul E. McKenney" Cc: Shuah Khan Cc: Gabriele Paoloni Cc: Juri Lelli Cc: Clark Williams Cc: Tao Zhou Cc: Randy Dunlap Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rv/monitor: Add the wip monitor

2022-07-30T18:01:30Z

The wakeup in preemptive (wip) monitor verifies if the wakeup events always take place with preemption disabled: | | v #==================# H preemptive H <+ #==================# | | | | preempt_disable | preempt_enable v | sched_waking +------------------+ | +--------------- | | | | | non_preemptive | | +--------------> | | -+ +------------------+ The wakeup event always takes place with preemption disabled because of the scheduler synchronization. However, because the preempt_count and its trace event are not atomic with regard to interrupts, some inconsistencies might happen. The documentation illustrates one of these cases. Link: https://lkml.kernel.org/r/c98ca678df81115fddc04921b3c79720c836b18f.1659052063.git.bristot@kernel.org Cc: Wim Van Sebroeck Cc: Guenter Roeck Cc: Jonathan Corbet Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Will Deacon Cc: Catalin Marinas Cc: Marco Elver Cc: Dmitry Vyukov Cc: "Paul E. McKenney" Cc: Shuah Khan Cc: Gabriele Paoloni Cc: Juri Lelli Cc: Clark Williams Cc: Tao Zhou Cc: Randy Dunlap Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rv/monitor: Add the wip monitor skeleton created by dot2k

2022-07-30T18:01:29Z

THIS CODE IS NOT LINKED TO THE MAKEFILE. This model does not compile because it lacks the instrumentation part, which will be added next. In the typical case, there will be only one patch, but it was split into two patches for educational purposes. This is the direct output this command line: $ dot2k -d tools/verification/models/wip.dot -t per_cpu Link: https://lkml.kernel.org/r/5eb7a9118917e8a814c5e49853a72fc62be0a101.1659052063.git.bristot@kernel.org Cc: Wim Van Sebroeck Cc: Guenter Roeck Cc: Jonathan Corbet Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Will Deacon Cc: Catalin Marinas Cc: Marco Elver Cc: Dmitry Vyukov Cc: "Paul E. McKenney" Cc: Shuah Khan Cc: Gabriele Paoloni Cc: Juri Lelli Cc: Clark Williams Cc: Tao Zhou Cc: Randy Dunlap Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

Documentation/rv: Add a basic documentation

2022-07-30T18:01:29Z

Add the runtime-verification.rst document, explaining the basics of RV and how to use the interface. Link: https://lkml.kernel.org/r/4be7d1a88ab1e2eb0767521e1ab52a149a154bc4.1659052063.git.bristot@kernel.org Cc: Wim Van Sebroeck Cc: Guenter Roeck Cc: Jonathan Corbet Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Will Deacon Cc: Catalin Marinas Cc: Marco Elver Cc: Dmitry Vyukov Cc: "Paul E. McKenney" Cc: Shuah Khan Cc: Gabriele Paoloni Cc: Juri Lelli Cc: Clark Williams Cc: Tao Zhou Cc: Randy Dunlap Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

rv/include: Add deterministic automata monitor definition via C macros

2022-07-30T18:01:28Z

In Linux terms, the runtime verification monitors are encapsulated inside the "RV monitor" abstraction. The "RV monitor" includes a set of instances of the monitor (per-cpu monitor, per-task monitor, and so on), the helper functions that glue the monitor to the system reference model, and the trace output as a reaction for event parsing and exceptions, as depicted below: Linux +----- RV Monitor ----------------------------------+ Formal Realm | | Realm +-------------------+ +----------------+ +-----------------+ | Linux kernel | | Monitor | | Reference | | Tracing | -> | Instance(s) | <- | Model | | (instrumentation) | | (verification) | | (specification) | +-------------------+ +----------------+ +-----------------+ | | | | V | | +----------+ | | | Reaction | | | +--+--+--+-+ | | | | | | | | | +-> trace output ? | +------------------------|--|----------------------+ | +----> panic ? +-------> Add the rv/da_monitor.h, enabling automatic code generation for the *Monitor Instance(s)* using C macros, and code to support it. The benefits of the usage of macro for monitor synthesis are 3-fold as it: - Reduces the code duplication; - Facilitates the bug fix/improvement; - Avoids the case of developers changing the core of the monitor code to manipulate the model in a (let's say) non-standard way. This initial implementation presents three different types of monitor instances: - DECLARE_DA_MON_GLOBAL(name, type) - DECLARE_DA_MON_PER_CPU(name, type) - DECLARE_DA_MON_PER_TASK(name, type) The first declares the functions for a global deterministic automata monitor, the second for monitors with per-cpu instances, and the third with per-task instances. Link: https://lkml.kernel.org/r/51b0bf425a281e226dfeba7401d2115d6091f84e.1659052063.git.bristot@kernel.org Cc: Wim Van Sebroeck Cc: Guenter Roeck Cc: Jonathan Corbet Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Will Deacon Cc: Catalin Marinas Cc: Marco Elver Cc: Dmitry Vyukov Cc: "Paul E. McKenney" Cc: Shuah Khan Cc: Gabriele Paoloni Cc: Juri Lelli Cc: Clark Williams Cc: Tao Zhou Cc: Randy Dunlap Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google)

linux/kernel/trace/rv, branch v6.0

rv/reactor: add __init/__exit annotations to module init/exit funcs

rv/monitors: Make monitor's automata definition static

rv: Unlock on error path in rv_unregister_reactor()

rv/reactor: Add the panic reactor

rv/reactor: Add the printk reactor

rv/monitor: Add the wwnr monitor

rv/monitor: Add the wip monitor

rv/monitor: Add the wip monitor skeleton created by dot2k

Documentation/rv: Add a basic documentation

rv/include: Add deterministic automata monitor definition via C macros

rv/reactor: add init/exit annotations to module init/exit funcs