Dynamic Device Driver Redirection to User Space
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Device driver development is hindered by inadequate debugging and testing tools due to their execution in kernel space, leading to lengthy development times and increased costs, as errors often cause system crashes requiring reboot and rewriting drivers for user-space frameworks.
Innovation Solution
Dynamic redirection of device driver functions from kernel space to user space, allowing developers to utilize user-space debugging tools without rewriting the entire driver, with the option to revert functions back to kernel space for execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device driver functions execute in kernel space, then system reliability and performance are improved, but debugging and testing become difficult and development time increases
Solution Approach 1:
The patent implements dynamic redirection that allows device driver functions to switch between kernel space and user space execution environments at runtime. The system can dynamically determine which execution environment is appropriate for each function based on debugging needs, error conditions, and operational requirements, resolving the contradiction by making the execution location flexible rather than fixed
Solution Approach 2:
The patent introduces an intermediary redirection mechanism that sits between the device driver functions and the execution environment. This intermediary layer captures function calls and redirects them to appropriate user space processes for debugging while maintaining the appearance of kernel space execution, thereby enabling easy debugging without sacrificing system reliability
2Productivity
If device driver functions execute in kernel space, then system performance is improved, but debugging tools and testing capabilities are limited
Solution Approach 1:
The patent creates copies of device driver functions in user space processes that mirror the kernel space implementations. These user space copies can be executed instead of the original kernel functions during debugging sessions, allowing developers to use full-featured user space debugging tools while the system maintains performance-critical paths in kernel space
Solution Approach 2:
The system dynamically selects between kernel space and user space execution based on operational context. During normal operation, functions execute in kernel space for maximum performance. During debugging or testing, the same functions can be redirected to user space where comprehensive debugging tools are available, thus resolving the contradiction between performance and debugging ease
3Stability of the object's composition
If device driver errors occur in kernel space, then system stability is compromised requiring reboot, but moving to user space framework requires rewriting entire driver
Solution Approach 1:
The patent introduces an intermediary redirection layer that allows the existing kernel space device driver to be executed in user space without modification. This intermediary captures function calls and redirects them to user space processes, enabling developers to leverage user space stability (where errors don't require reboots) while keeping the original driver code intact, thus avoiding the need to rewrite the entire driver
Solution Approach 2:
The patent creates a universal execution framework that can run device driver functions in either kernel space or user space without requiring different driver implementations. The same driver binary can be redirected to user space for stable execution during testing, while maintaining kernel space execution for production, eliminating the need to create separate user space driver frameworks
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Various embodiments are generally directed an apparatus and method for configuring an execution environment in a user space for device driver operations and redirecting a device driver operation for execution in the execution environment in the user space including copying instructions of the device driver operation from the kernel space to a user process in the user space. In addition, the redirected device driver operation may be executed in the execution environment in the user space.