From: Dan Williams dan.j.williams@intel.com
commit 67feaba413ec68daf4124e9870878899b4ed9a0e upstream.
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 b13a3e5fd40b ("ACPI: APEI: Fix _EINJ vs EFI_MEMORY_SP")
...that fixed EINJ support for "Soft Reserved" ranges in the first instance.
Fixes: 262b45ae3ab4 ("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@dwil... Signed-off-by: Dan Williams dan.j.williams@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/dax/hmem/device.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/dax/hmem/device.c +++ b/drivers/dax/hmem/device.c @@ -15,6 +15,7 @@ void hmem_register_device(int target_nid .start = r->start, .end = r->end, .flags = IORESOURCE_MEM, + .desc = IORES_DESC_SOFT_RESERVED, }; struct platform_device *pdev; struct memregion_info info;