[PATCH v7 0/5] fw_cfg: add DMA operations & etc/vmcoreinfo support

From: Marc-Andrà Lureau
Date: Mon Nov 20 2017 - 04:55:32 EST


This series adds DMA operations support to the qemu fw_cfg kernel
module and populates "etc/vmcoreinfo" with vmcoreinfo location

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

- 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

- 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

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

- 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'

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

Marc-Andrà 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 | 276 ++++++++++++++++++++++++++++++++++++-----
kernel/crash_core.c | 1 +
2 files changed, 247 insertions(+), 30 deletions(-)