This enables to capture snapshot of controller information via device coredump machanism, and it helps diagnose and debug issues.
The nvme device coredump is triggered when command timeout occurs, and creates the following coredump files. - regs: NVMe controller registers (00h to 4Fh) - sq<qid>: Submission queue - cq<qid>: Completion queue - telemetry-ctrl-log: Telemetry controller-initiated log (if available) - data: Empty (I don't have the NVMe device that supports telemetry log page for now, so capturing telemetry log is untested.) The device coredump mechanism currently allows drivers to create only a single coredump file, so this also provides a new function that allows drivers to create several device coredump files in one crashed device. * v2 - Add Reviewed-by tag. - Add patch to fix typo in comment - Remove unneeded braces. - Allocate device_entry followed by an array of devcd_file elements. - Add telemetry log page definisions - Add facility to check log page attributes - Exclude the doorbell registers from register dump. - Save controller registers in a binary format instead of a text format. - Create an empty 'data' file in the device coredump. - Save telemetry controller-initiated log if available - Make coredump procedure into two phases (before resetting controller and after resetting as soon as admin queue is available). Akinobu Mita (7): devcoredump: use memory_read_from_buffer devcoredump: fix typo in comment devcoredump: allow to create several coredump files in one device nvme.h: add telemetry log page definisions nvme: add facility to check log page attributes nvme-pci: add device coredump support nvme-pci: trigger device coredump on command timeout drivers/base/devcoredump.c | 168 ++++++++++------ drivers/nvme/host/Kconfig | 1 + drivers/nvme/host/core.c | 2 + drivers/nvme/host/nvme.h | 1 + drivers/nvme/host/pci.c | 460 ++++++++++++++++++++++++++++++++++++++++++-- include/linux/devcoredump.h | 33 ++++ include/linux/nvme.h | 25 +++ 7 files changed, 617 insertions(+), 73 deletions(-) Cc: Johannes Berg <[email protected]> Cc: Keith Busch <[email protected]> Cc: Jens Axboe <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Sagi Grimberg <[email protected]> Cc: Minwoo Im <[email protected]> -- 2.7.4
