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Updates for powerpc hcall

Mamatha Inamdar requested to merge mainamdar/centos-stream-9:bz2222935 into main

Description: Updates for powerpc hcall

Bugzilla: https://bugzilla.redhat.com/2222935

Build Info: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=54097183

Tested: Verified Brew build test kernel RPMs and confirmed issue is resovled

Signed-off-by: Mamatha Inamdar minamdar@redhat.com

commit 9d2ccf00bddc268045e3d65a8108d61ada0e4b4e Author: Gaurav Batra gbatra@linux.vnet.ibm.com Date: Thu May 25 09:34:54 2023 -0500

powerpc/iommu: Limit number of TCEs to 512 for H_STUFF_TCE hcall

Currently in tce_freemulti_pSeriesLP() there is no limit on how many
TCEs are passed to the H_STUFF_TCE hcall. This has not caused an issue
until now, but newer firmware releases have started enforcing a limit of
512 TCEs per call.

The limit is correct per the specification (PAPR v2.12 § 14.5.4.2.3).

The code has been in it's current form since it was initially merged.

Cc: stable@vger.kernel.org
Signed-off-by: Gaurav Batra <gbatra@linux.vnet.ibm.com>
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
[mpe: Tweak change log wording & add PAPR reference]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230525143454.56878-1-gbatra@linux.vnet.ibm.com

Signed-off-by: Mamatha Inamdar minamdar@redhat.com

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