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drm/xe/pf: Fix MMIO access using PF view instead of VF view during migration

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pf_migration_mmio_save() and pf_migration_mmio_restore() initialize a
local VF-specific MMIO view via xe_mmio_init_vf_view() but then pass
&gt->mmio (the PF base) to all xe_mmio_read32()/xe_mmio_write32()
calls instead of the local &mmio. This causes the PF own SW flag
registers to be saved/restored rather than the target VF registers,
silently corrupting migration state.

Use the VF MMIO view for all register accesses, matching the correct
pattern used in pf_clear_vf_scratch_regs().

Fixes: b7c1b990f7 ("drm/xe/pf: Handle MMIO migration data as part of PF control")
Cc: Michał Winiarski <michal.winiarski@intel.com>
Assisted-by: Claude:claude-opus-4.6
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Stuart Summers <stuart.summers@intel.com>
Link: https://patch.msgid.link/20260429192259.4009211-1-shuicheng.lin@intel.com
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
(cherry picked from commit 7d9c39cfb3)
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
This commit is contained in:
Shuicheng Lin
2026-05-05 16:15:00 -07:00
committed by Matthew Brost
parent d01012c740
commit b87951a0ae
1 changed files with 4 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/gpu/drm/xe/xe_gt_sriov_pf_migration.c
+4 -4
View File
@@ -385,10 +385,10 @@ static int pf_migration_mmio_save(struct xe_gt *gt, unsigned int vfid, void *buf
if (xe_gt_is_media_type(gt))
for (n = 0; n < MED_VF_SW_FLAG_COUNT; n++)
regs[n] = xe_mmio_read32(&gt->mmio, MED_VF_SW_FLAG(n));
regs[n] = xe_mmio_read32(&mmio, MED_VF_SW_FLAG(n));
else
for (n = 0; n < VF_SW_FLAG_COUNT; n++)
regs[n] = xe_mmio_read32(&gt->mmio, VF_SW_FLAG(n));
regs[n] = xe_mmio_read32(&mmio, VF_SW_FLAG(n));
return 0;
}
@@ -407,10 +407,10 @@ static int pf_migration_mmio_restore(struct xe_gt *gt, unsigned int vfid,
if (xe_gt_is_media_type(gt))
for (n = 0; n < MED_VF_SW_FLAG_COUNT; n++)
xe_mmio_write32(&gt->mmio, MED_VF_SW_FLAG(n), regs[n]);
xe_mmio_write32(&mmio, MED_VF_SW_FLAG(n), regs[n]);
else
for (n = 0; n < VF_SW_FLAG_COUNT; n++)
xe_mmio_write32(&gt->mmio, VF_SW_FLAG(n), regs[n]);
xe_mmio_write32(&mmio, VF_SW_FLAG(n), regs[n]);
return 0;
}