linux-kernel - [PATCH v15 00/11] fw_cfg: add DMA operations & etc/vmcoreinfo support

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Message-Id: <20180215213312.29234-1-marcandre.lureau@redhat.com>
Date:   Thu, 15 Feb 2018 22:33:01 +0100
From:   Marc-André Lureau <marcandre.lureau@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     slp@...hat.com, bhe@...hat.com, mst@...hat.com, somlo@....edu,
        xiaolong.ye@...el.com,
        Marc-André Lureau <marcandre.lureau@...hat.com>
Subject: [PATCH v15 00/11] fw_cfg: add DMA operations & etc/vmcoreinfo support

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).

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