linux-kernel - [PATCH v8 0/5] fw_cfg: add DMA operations & etc/vmcoreinfo support

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Message-Id: <20171123140206.3911-1-marcandre.lureau@redhat.com>
Date:   Thu, 23 Nov 2017 15:02:01 +0100
From:   Marc-André Lureau <marcandre.lureau@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     somlo@....edu, xiaolong.ye@...el.com, qemu-devel@...gnu.org,
        mst@...hat.com,
        Marc-André Lureau <marcandre.lureau@...hat.com>
Subject: [PATCH v8 0/5] 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.

Note: the support for this entry handling has been merged for upcoming
qemu release (2.11).

v8:
- fix ltp again: bring back kmalloc() for DMA memory (see "What memory
  is DMA'able?" limitations in Documentation/DMA-API-HOWTO.txt)
  Interestingly, it didn't fail when the module was linked in..

v7:
- add a patch to fix driver remove()
- remove DMA operatiom timeout (qemu finishes sync today)
- synchronize the DMA transfer before reading from CPU
- removed kmalloc() use static allocation instead
- drop some r-b tags

v6:
- change acpi_acquire_global_lock() error to return EINVAL
  (instead of EBUSY)
- replace 0 as pointer argument for NULL
- add Gabriel r-b/a-b tags

v5:
- resent to CC kdump people on the paddr_vmcoreinfo_note() export patch

v4:
- export paddr_vmcoreinfo_note() to fix fw_cfg.ko build
- fix build with !CONFIG_CRASH_CORE
- replace the unbounded yield() loop with a usleep_range() loop and a
  200ms timeout
- do not write vmcoreinfo entry when running the kdump kernel (D. Hatayama)
- drop the experimental sysfs write support patch from this series

v3: (thanks kbuild)
- add "fw_cfg: fix the command line module name" patch
- fix build of "fw_cfg: add DMA register" with CONFIG_FW_CFG_SYSFS_CMDLINE=y
- fix 'Wshift-count-overflow'

v2:
- use platform device for dma mapping
- add etc/vmcoreinfo patch
- some code cleanups

Marc-André Lureau (5):
  fw_cfg: fix driver remove
  fw_cfg: add DMA register
  fw_cfg: do DMA read operation
  crash: export paddr_vmcoreinfo_note()
  fw_cfg: write vmcoreinfo details

 drivers/firmware/qemu_fw_cfg.c | 283 ++++++++++++++++++++++++++++++++++++-----
 kernel/crash_core.c            |   1 +
 2 files changed, 254 insertions(+), 30 deletions(-)

-- 
2.15.0.277.ga3d2ad2c43