nouveau/tu102: flush all pdbs on vmm flush

This is a hack around a bug exposed with the GSP code, I'm not sure
what is happening exactly, but it appears some of our flushes don't
result in proper tlb invalidation for out BAR2 and we get a BAR2
fault from GSP and it all dies.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231130010852.4034774-1-airlied@gmail.com

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmtu102.c b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmtu102.c
index e34bc60764010f8307a01ce4fe21808bb99e5e43..8379e72d77ab2b81dc16c11400b8e35641a6e906 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmtu102.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmtu102.c
@@ -31,7 +31,7 @@ tu102_vmm_flush(struct nvkm_vmm *vmm, int depth)
 
        type |= 0x00000001; /* PAGE_ALL */
        if (atomic_read(&vmm->engref[NVKM_SUBDEV_BAR]))
-               type |= 0x00000004; /* HUB_ONLY */
+               type |= 0x00000006; /* HUB_ONLY | ALL PDB (hack) */
 
        mutex_lock(&vmm->mmu->mutex);