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mirror_ubuntu-kernels/drivers/dax
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Dan Williams 67feaba413 devdax: Fix soft-reservation memory description 
The "hmem" platform-devices that are created to represent the
platform-advertised "Soft Reserved" memory ranges end up inserting a
resource that causes the iomem_resource tree to look like this:

340000000-43fffffff : hmem.0
  340000000-43fffffff : Soft Reserved
    340000000-43fffffff : dax0.0

This is because insert_resource() reparents ranges when they completely
intersect an existing range.

This matters because code that uses region_intersects() to scan for a
given IORES_DESC will only check that top-level 'hmem.0' resource and
not the 'Soft Reserved' descendant.

So, to support EINJ (via einj_error_inject()) to inject errors into
memory hosted by a dax-device, be sure to describe the memory as
IORES_DESC_SOFT_RESERVED. This is a follow-on to:

commit b13a3e5fd4 ("ACPI: APEI: Fix _EINJ vs EFI_MEMORY_SP")

...that fixed EINJ support for "Soft Reserved" ranges in the first
instance.

Fixes: 262b45ae3a ("x86/efi: EFI soft reservation to E820 enumeration")
Reported-by: Ricardo Sandoval Torres <ricardo.sandoval.torres@intel.com>
Tested-by: Ricardo Sandoval Torres <ricardo.sandoval.torres@intel.com>
Cc: <stable@vger.kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Omar Avelar <omar.avelar@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Mark Gross <markgross@kernel.org>
Link: https://lore.kernel.org/r/166397075670.389916.7435722208896316387.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2022-09-24 18:05:53 -07:00
..
hmem devdax: Fix soft-reservation memory description 2022-09-24 18:05:53 -07:00
pmem dax: Kill DEV_DAX_PMEM_COMPAT 2021-11-24 19:21:35 -08:00
bus.c Merge branch 'akpm' (patches from Andrew) 2022-01-15 20:37:06 +02:00
bus.h Merge branch 'akpm' (patches from Andrew) 2022-01-15 20:37:06 +02:00
dax-private.h device-dax: add an 'align' attribute 2020-10-13 18:38:28 -07:00
device.c fs: Convert __set_page_dirty_no_writeback to noop_dirty_folio 2022-03-16 13:37:05 -04:00
Kconfig dax: remove CONFIG_DAX_DRIVER 2021-12-04 08:58:51 -08:00
kmem.c dax/kmem: use a single static memory group for a single probed unit 2021-09-08 11:50:23 -07:00
Makefile dax: Kill DEV_DAX_PMEM_COMPAT 2021-11-24 19:21:35 -08:00
pmem.c dax: Kill DEV_DAX_PMEM_COMPAT 2021-11-24 19:21:35 -08:00
super.c dax: introduce holder for dax_device 2022-07-17 17:14:30 -07:00