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SMU firmware expects the driver maintains error context and doesn't interact with SMU any more when SMU errors occurred. That will aid in debugging SMU firmware issues. Add SMU debug option support for this request, it can be enabled or disabled via amdgpu_smu_debug debugfs file. Use a 32-bit mask to indicate corresponding debug modes. Currently, only one mode(HALT_ON_ERROR) is supported. When enabled, it brings hardware to a kind of halt state so that no one can touch it any more in the envent of SMU errors. The dirver interacts with SMU via sending messages. And threre are three ways to sending messages to SMU in current implementation. Handle them respectively as following: 1, smu_cmn_send_smc_msg_with_param() for normal timeout cases Halt on any error. 2, smu_cmn_send_msg_without_waiting()/smu_cmn_wait_for_response() for longer timeout cases Halt on errors apart from ETIME. Otherwise this way won't work. Let the user handle ETIME error in such a case. 3, smu_cmn_send_msg_without_waiting() for no waiting cases Halt on errors apart from ETIME. Otherwise second way won't work. == Command Guide == 1, enable HALT_ON_ERROR mode # echo 0x1 > /sys/kernel/debug/dri/0/amdgpu_smu_debug 2, disable HALT_ON_ERROR mode # echo 0x0 > /sys/kernel/debug/dri/0/amdgpu_smu_debug v5: - Use bit mask to allow more debug features.(Evan) - Use WRAN() instead of BUG().(Evan) v4: - Set to halt state instead of a simple hang.(Christian) v3: - Use debugfs_create_bool().(Christian) - Put variable into smu_context struct. - Don't resend command when timeout. v2: - Resend command when timeout.(Lijo) - Use debugfs file instead of module parameter. Signed-off-by: Lang Yu <lang.yu@amd.com> Reviewed-by: Lijo Lazar <lijo.lazar@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.