From 64ca4cdd1031206424e6455f0ae4fb0560d8f46a Mon Sep 17 00:00:00 2001 From: Junrui Luo Date: Mon, 17 Aug 2026 14:50:40 +0800 Subject: [PATCH] drm/nouveau/dmem: pin VRAM for the whole registered range Commit c32287471077 ("gpu/drm/nouveau: enable THP support for GPU memory migration") grew the device-private region that nouveau_dmem_chunk_alloc() registers from DMEM_CHUNK_SIZE to DMEM_CHUNK_SIZE * NR_CHUNKS, but left the VRAM buffer object backing that region at DMEM_CHUNK_SIZE. nouveau_dmem_page_addr() returns chunk->bo->offset plus the page's offset within the registered region, so every page past the first chunk resolves to VRAM outside the buffer object. Size the buffer object to the region it backs. Fixes: c32287471077 ("gpu/drm/nouveau: enable THP support for GPU memory migration") Reported-by: Yuhao Jiang Assisted-by: LLM Cc: stable@vger.kernel.org Signed-off-by: Junrui Luo Reviewed-by: Lyude Paul Signed-off-by: Lyude Paul Link: https://patch.msgid.link/20260817-nouveau-fixes-v1-1-f518d0c735f3@outlook.com --- drivers/gpu/drm/nouveau/nouveau_dmem.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c index ad4570c50be7..e74d7bb975a8 100644 --- a/drivers/gpu/drm/nouveau/nouveau_dmem.c +++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c @@ -339,8 +339,8 @@ nouveau_dmem_chunk_alloc(struct nouveau_drm *drm, struct page **ppage, chunk->pagemap.ops = &nouveau_dmem_pagemap_ops; chunk->pagemap.owner = drm->dev; - ret = nouveau_bo_new_pin(&drm->client, NOUVEAU_GEM_DOMAIN_VRAM, DMEM_CHUNK_SIZE, - &chunk->bo); + ret = nouveau_bo_new_pin(&drm->client, NOUVEAU_GEM_DOMAIN_VRAM, + DMEM_CHUNK_SIZE * NR_CHUNKS, &chunk->bo); if (ret) goto out_release;