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If some code path executes fm10k_service_event_schedule(), it is guaranteed that we only queue the service task once, since we use __FM10K_SERVICE_SCHED flag. Unfortunately this has a side effect that if a service request occurs while we are currently running the watchdog, it is possible that we will fail to notice the request and ignore it until the next time the request occurs. This can cause problems with pf/vf mailbox communication and other service event tasks. To avoid this, introduce a FM10K_SERVICE_REQUEST bit. When we successfully schedule (and set the _SCHED bit) the service task, we will clear this bit. However, if we are unable to currently schedule the service event, we just set the new SERVICE_REQUEST bit. Finally, after the service event completes, we will re-schedule if the request bit has been set. This should ensure that we do not miss any service event schedules, since we will re-schedule it once the currently running task finishes. This means that for each request, we will always schedule the service task to run at least once in full after the request came in. This will avoid timing issues that can occur with the service event scheduling. We do pay a cost in re-running many tasks, but all the service event tasks use either flags to avoid duplicate work, or are tolerant of being run multiple times. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Tested-by: Krishneil Singh <krishneil.k.singh@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.