On Thu, Feb 15, 2018 at 10:33:01PM +0100, Marc-André Lureau wrote:
> Hi,
>
> This series adds DMA operations support to the qemu fw_cfg kernel
> module and populates "etc/vmcoreinfo" with vmcoreinfo location
> details (entry added since qemu 2.11 with -device vmcoreinfo).
Pls reorder with patches 3-7 first as these are fixes.
> v15:
> - fix fw_cfg.h uapi header #include
> - use BSD license for fw_cfg.h uapi header
> - move the uapi defines/structs for DMA & vmcoreinfo in the
> corresponding patch
> - use cpu_relax() instead of usleep_range(50, 100);
> - replace do { } while(true) by for (;;)
> - fix the rmb() call location
> - add a preliminary patch to handle error from fw_cfg_write_blob()
> - rewrite fw_cfg_sel_endianness() to wrap iowrite() calls
>
> v14:
> - add "fw_cfg: add a public uapi header"
> - fix sparse warnings & don't introduce new warnings
> - add memory barriers to force IO ordering
> - split fw_cfg_read_blob() in fw_cfg_read_blob_io() and
> fw_cfg_read_blob_dma()
> - add error handling to fw_cfg_read_blob() callers
> - minor stylistic changes
>
> v13:
> - reorder patch series, introduce DMA write before DMA read
> - do some measurements of DMA read speed-ups
>
> v12:
> - fix virt_to_phys(NULL) panic with CONFIG_DEBUG_VIRTUAL=y
> - do not use DMA read, except for kmalloc() memory we allocated
> ourself (only fw_cfg_register_dir_entries() so far)
>
> v11:
> - add #include <linux/crash_core.h> in last patch,
> fixing kbuild .config test
>
> Marc-André Lureau (11):
> crash: export paddr_vmcoreinfo_note()
> fw_cfg: add a public uapi header
> fw_cfg: fix sparse warnings in fw_cfg_sel_endianness()
> fw_cfg: fix sparse warnings with fw_cfg_file
> fw_cfg: fix sparse warning reading FW_CFG_ID
> fw_cfg: fix sparse warnings around FW_CFG_FILE_DIR read
> fw_cfg: remove inline from fw_cfg_read_blob()
> fw_cfg: handle fw_cfg_read_blob() error
> fw_cfg: add DMA register
> fw_cfg: write vmcoreinfo details
> RFC: fw_cfg: do DMA read operation
>
> MAINTAINERS | 1 +
> drivers/firmware/qemu_fw_cfg.c | 334
> +++++++++++++++++++++++++++++++++--------
> include/uapi/linux/fw_cfg.h | 97 ++++++++++++
> kernel/crash_core.c | 1 +
> 4 files changed, 369 insertions(+), 64 deletions(-)
> create mode 100644 include/uapi/linux/fw_cfg.h
>
> --
> 2.16.1.73.g5832b7e9f2
