Have been trying to provide mmc backend support for fs/pstore feature to be able to capture panic and dmesg logs to a emmc partition. The code is based on mtdpstore and used kernel mmctest also as reference to be able to send mmc rw requests. This code is work in progress and does not succssfully write to the mmc partition as expected when a magic sysrq panic is induced. Needed help from original authors and mmc core and host driver experts to comment on missing peices. To that end I am sending an RFC patch. I have confirmed by enabling dynamic debug that mmcpstore read and panic_write routines do get called by the fs/pstore/zone driver, however I do not see expected results mounted /sys/fs/pstore after a reboot. Kamal Dasu (1): mmc: Add mmc pstore backend support drivers/mmc/core/Kconfig | 13 + drivers/mmc/core/Makefile | 1 + drivers/mmc/core/block.c | 61 ++-- drivers/mmc/core/block.h | 9 + drivers/mmc/core/core.c | 28 +- drivers/mmc/core/mmcpstore.c | 594 +++++++++++++++++++++++++++++++++++ drivers/mmc/host/sdhci.c | 166 +++++----- include/linux/mmc/host.h | 3 + 8 files changed, 746 insertions(+), 129 deletions(-) create mode 100644 drivers/mmc/core/mmcpstore.c -- 2.17.1
