linux-kernel - [PATCH AUTOSEL 6.6 19/47] nouveau/tu102: flush all pdbs on vmm flush

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Date:   Mon, 11 Dec 2023 08:50:20 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dave Airlie <airlied@...hat.com>,
        Danilo Krummrich <dakr@...hat.com>,
        Sasha Levin <sashal@...nel.org>, kherbst@...hat.com,
        lyude@...hat.com, airlied@...il.com, daniel@...ll.ch,
        bskeggs@...hat.com, dri-devel@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.6 19/47] nouveau/tu102: flush all pdbs on vmm flush

From: Dave Airlie <airlied@...hat.com>

[ Upstream commit cb9c919364653eeafb49e7ff5cd32f1ad64063ac ]

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@...hat.com>
Signed-off-by: Danilo Krummrich <dakr@...hat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231130010852.4034774-1-airlied@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmtu102.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmtu102.c b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmmtu102.c
index 6cb5eefa45e9a..5a08458fe1b7f 100644
--- 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);
 
-- 
2.42.0