Sometimes firmware sizes can be in tens of MB's and reading all the memory during coredump can consume lot of time and memory. Introducing support for mini-dumps. Mini-dump contains smallest amount of useful information, that could help to debug subsystem crashes. During bootup memory is allocated in SMEM (Shared memory) in the form of a table that contains the physical addresses and sizes of the regions that are supposed to be collected during coredump. This memory is shared amongst all processors in a Qualcomm platform, so all remoteprocs fill in their entry in the global table once they are out of reset. This patch series adds support for parsing the global minidump table and uses the current coredump frameork to expose this memory to userspace during remoteproc's recovery. This patch series also integrates the patch: https://patchwork.kernel.org/patch/11695541/ sent by Siddharth. Changelog: v6 -> v7: - The STR_TAB size is calculated dynamically now instead of a predefined size. - Added comments to indicate details about the reserved null section header. More details can be found at https://refspecs.linuxfoundation.org/elf/elf.pdf. v5 -> v6: - Removed priv_cleanup operation from rproc_ops. The dump_segments list is updated and cleaned up each time minidump is invoked. - Split patch #2 into 2 parts - one that adds the rproc_minidump function, and the other that uses the new function in the qcom_q6v5_pas driver. - Updated structs in qcom_minidump to explicitly indicate the endianness of the data stored in SMEM, also updated member names. - Read the global table of contents in SMEM each time adsp_minidump is invoked. v4 -> v5: - Fixed adsp_add_minidump_segments to read IO memory using appropriate functions. v3 -> v4: - Made adsp_priv_cleanup a static function. v2 -> v3: - Refactored code to remove dependency on Qualcomm configs. - Renamed do_rproc_minidump to rproc_minidump and marked as exported symbol. v1 -> v2: - 3 kernel test robot warnings have been resolved. - Introduced priv_cleanup op in order to making the cleaning of private elements used by the remoteproc more readable. - Removed rproc_cleanup_priv as it is no longer needed. - Switched to if/else format for rproc_alloc in order to keep the static const decalaration of adsp_minidump_ops. Siddharth Gupta (4): remoteproc: core: Add ops to enable custom coredump functionality remoteproc: coredump: Add minidump functionality remoteproc: qcom: Add capability to collect minidumps remoteproc: qcom: Add minidump id for sm8150 modem drivers/remoteproc/qcom_minidump.h | 64 +++++++++++++ drivers/remoteproc/qcom_q6v5_pas.c | 105 ++++++++++++++++++++- drivers/remoteproc/remoteproc_core.c | 6 +- drivers/remoteproc/remoteproc_coredump.c | 140 ++++++++++++++++++++++++++++ drivers/remoteproc/remoteproc_elf_helpers.h | 26 ++++++ include/linux/remoteproc.h | 3 + 6 files changed, 341 insertions(+), 3 deletions(-) create mode 100644 drivers/remoteproc/qcom_minidump.h -- Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
