diff options
| -rw-r--r-- | drivers/gpu/drm/xe/xe_device.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c index 03492fbcb8fb..db513175b29e 100644 --- a/drivers/gpu/drm/xe/xe_device.c +++ b/drivers/gpu/drm/xe/xe_device.c @@ -744,13 +744,22 @@ void xe_device_shutdown(struct xe_device *xe) { } +/** + * xe_device_wmb() - Device specific write memory barrier + * @xe: the &xe_device + * + * While wmb() is sufficient for a barrier if we use system memory, on discrete + * platforms with device memory we additionally need to issue a register write. + * Since it doesn't matter which register we write to, use the read-only VF_CAP + * register that is also marked as accessible by the VFs. + */ void xe_device_wmb(struct xe_device *xe) { struct xe_gt *gt = xe_root_mmio_gt(xe); wmb(); if (IS_DGFX(xe)) - xe_mmio_write32(gt, SOFTWARE_FLAGS_SPR33, 0); + xe_mmio_write32(gt, VF_CAP_REG, 0); } /** |