From cf1becb7f996a0a23ea2c270cf6bb0911ec3ca1a Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ma=C3=ADra=20Canal?= Date: Mon, 23 Sep 2024 10:55:05 -0300 Subject: [PATCH] drm/v3d: Address race-condition in MMU flush MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit We must first flush the MMU cache and then, flush the TLB, not the other way around. Currently, we can see a race condition between the MMU cache and the TLB when running multiple rendering processes at the same time. This is evidenced by MMU errors triggered by the IRQ. Fix the MMU flush order by flushing the MMU cache and then the TLB. Also, in order to address the race condition, wait for the MMU cache flush to finish before starting the TLB flush. Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+") Signed-off-by: Maíra Canal Reviewed-by: Iago Toral Quiroga Link: https://patchwork.freedesktop.org/patch/msgid/20240923141348.2422499-2-mcanal@igalia.com --- drivers/gpu/drm/v3d/v3d_mmu.c | 29 ++++++++++------------------- 1 file changed, 10 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/v3d/v3d_mmu.c b/drivers/gpu/drm/v3d/v3d_mmu.c index 14f3af40d6f6d..e36ec3343b06e 100644 --- a/drivers/gpu/drm/v3d/v3d_mmu.c +++ b/drivers/gpu/drm/v3d/v3d_mmu.c @@ -32,32 +32,23 @@ static int v3d_mmu_flush_all(struct v3d_dev *v3d) { int ret; - /* Make sure that another flush isn't already running when we - * start this one. - */ - ret = wait_for(!(V3D_READ(V3D_MMU_CTL) & - V3D_MMU_CTL_TLB_CLEARING), 100); - if (ret) - dev_err(v3d->drm.dev, "TLB clear wait idle pre-wait failed\n"); - - V3D_WRITE(V3D_MMU_CTL, V3D_READ(V3D_MMU_CTL) | - V3D_MMU_CTL_TLB_CLEAR); - - V3D_WRITE(V3D_MMUC_CONTROL, - V3D_MMUC_CONTROL_FLUSH | + V3D_WRITE(V3D_MMUC_CONTROL, V3D_MMUC_CONTROL_FLUSH | V3D_MMUC_CONTROL_ENABLE); - ret = wait_for(!(V3D_READ(V3D_MMU_CTL) & - V3D_MMU_CTL_TLB_CLEARING), 100); + ret = wait_for(!(V3D_READ(V3D_MMUC_CONTROL) & + V3D_MMUC_CONTROL_FLUSHING), 100); if (ret) { - dev_err(v3d->drm.dev, "TLB clear wait idle failed\n"); + dev_err(v3d->drm.dev, "MMUC flush wait idle failed\n"); return ret; } - ret = wait_for(!(V3D_READ(V3D_MMUC_CONTROL) & - V3D_MMUC_CONTROL_FLUSHING), 100); + V3D_WRITE(V3D_MMU_CTL, V3D_READ(V3D_MMU_CTL) | + V3D_MMU_CTL_TLB_CLEAR); + + ret = wait_for(!(V3D_READ(V3D_MMU_CTL) & + V3D_MMU_CTL_TLB_CLEARING), 100); if (ret) - dev_err(v3d->drm.dev, "MMUC flush wait idle failed\n"); + dev_err(v3d->drm.dev, "MMU TLB clear wait idle failed\n"); return ret; } -- 2.47.2