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PURGED BOs have >> no backing store and are permanently invalid. >> >> Return -EBUSY for DONTNEED BOs (temporary purgeable state) and >> -EINVAL for purged BOs (permanent, no backing store). >> >> The export path now checks the BO's purgeable state before creating >> the dma-buf, preventing external devices from accessing memory that >> may be purged at any time. >> >> v6: >> - Split DONTNEED → -EBUSY and PURGED → -EINVAL for consistency >>   with the rest of the series (Thomas, Matt) >> >> Cc: Matthew Brost >> Cc: Thomas Hellström >> Cc: Himal Prasad Ghimiray >> Signed-off-by: Arvind Yadav >> --- >>  drivers/gpu/drm/xe/xe_dma_buf.c | 21 +++++++++++++++++++++ >>  1 file changed, 21 insertions(+) >> >> diff --git a/drivers/gpu/drm/xe/xe_dma_buf.c >> b/drivers/gpu/drm/xe/xe_dma_buf.c >> index ea370cd373e9..aba6b9696030 100644 >> --- a/drivers/gpu/drm/xe/xe_dma_buf.c >> +++ b/drivers/gpu/drm/xe/xe_dma_buf.c >> @@ -223,6 +223,23 @@ struct dma_buf *xe_gem_prime_export(struct >> drm_gem_object *obj, int flags) >>   if (bo->vm) >>   return ERR_PTR(-EPERM); >> >> + /* >> + * Reject exporting purgeable BOs. DONTNEED BOs can be >> purged >> + * at any time, making the exported dma-buf unusable. Purged >> BOs >> + * have no backing store and are permanently invalid. >> + */ >> + xe_bo_lock(bo, false); > Interruptible lock. Noted, ~Arvind > > /Thomas > > >> + if (xe_bo_madv_is_dontneed(bo)) { >> + ret = -EBUSY; >> + goto out_unlock; >> + } >> + >> + if (xe_bo_is_purged(bo)) { >> + ret = -EINVAL; >> + goto out_unlock; >> + } >> + xe_bo_unlock(bo); >> + >>   ret = ttm_bo_setup_export(&bo->ttm, &ctx); >>   if (ret) >>   return ERR_PTR(ret); >> @@ -232,6 +249,10 @@ struct dma_buf *xe_gem_prime_export(struct >> drm_gem_object *obj, int flags) >>   buf->ops = &xe_dmabuf_ops; >> >>   return buf; >> + >> +out_unlock: >> + xe_bo_unlock(bo); >> + return ERR_PTR(ret); >>  } >> >>  static struct drm_gem_object *