Merge: Updates for EEH PE state translation

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/6253

Description: Updates for EEH PE state translation

JIRA: https://issues.redhat.com/browse/RHEL-74250

Build Info: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=66460133

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

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

commit c842f9dd3daca7a626964d1e4dbe79d0d2c03a1e
Author: Narayana Murty N <nnmlinux@linux.ibm.com>
Date:   Thu Jan 16 04:39:54 2025 -0600

    powerpc/pseries/eeh: Fix get PE state translation

    The PE Reset State "0" returned by RTAS calls
    "ibm_read_slot_reset_[state|state2]" indicates that the reset is
    deactivated and the PE is in a state where MMIO and DMA are allowed.
    However, the current implementation of "pseries_eeh_get_state()" does
    not reflect this, causing drivers to incorrectly assume that MMIO and
    DMA operations cannot be resumed.

    The userspace drivers as a part of EEH recovery using VFIO ioctls fail
    to detect when the recovery process is complete. The VFIO_EEH_PE_GET_STATE
    ioctl does not report the expected EEH_PE_STATE_NORMAL state, preventing
    userspace drivers from functioning properly on pseries systems.

    The patch addresses this issue by updating 'pseries_eeh_get_state()'
    to include "EEH_STATE_MMIO_ENABLED" and "EEH_STATE_DMA_ENABLED" in
    the result mask for PE Reset State "0". This ensures correct state
    reporting to the callers, aligning the behavior with the PAPR specification
    and fixing the bug in EEH recovery for VFIO user workflows.

    Fixes: 00ba05a ("powerpc/pseries: Cleanup on pseries_eeh_get_state()")
    Cc: stable@vger.kernel.org
    Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
    Signed-off-by: Narayana Murty N <nnmlinux@linux.ibm.com>
    Link: https://lore.kernel.org/stable/20241212075044.10563-1-nnmlinux%40linux.ibm.com
    Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
    Link: https://patch.msgid.link/20250116103954.17324-1-nnmlinux@linux.ibm.com

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

Approved-by: Steve Best <sbest@redhat.com>
Approved-by: Tony Camuso <tcamuso@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Patrick Talbert <ptalbert@redhat.com>

Author: ptalbert

arch/powerpc/platforms/pseries/eeh_pseries.c

@@ -578,8 +578,10 @@ static int pseries_eeh_get_state(struct eeh_pe *pe, int *delay)
 
 	switch(rets[0]) {
 	case 0:
-		result = EEH_STATE_MMIO_ACTIVE |
-			 EEH_STATE_DMA_ACTIVE;
+		result = EEH_STATE_MMIO_ACTIVE	|
+			 EEH_STATE_DMA_ACTIVE	|
+			 EEH_STATE_MMIO_ENABLED	|
+			 EEH_STATE_DMA_ENABLED;
 		break;
 	case 1:
 		result = EEH_STATE_RESET_ACTIVE |